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4c23fa02e9
RetroArch/deps/civetweb/civetweb.c
twinaphex bbef084955 Use getaddrinfo_retro even for dependencies
2017-05-20 14:22:30 +02:00

13064 lines
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/* Copyright (c) 2013-2016 the Civetweb developers
* Copyright (c) 2004-2013 Sergey Lyubka
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#if defined(_WIN32)
#if !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS /* Disable deprecation warning in VS2005 */
#endif
#ifndef _WIN32_WINNT /* defined for tdm-gcc so we can use getnameinfo */
#define _WIN32_WINNT 0x0501
#endif
#else
#if defined(__GNUC__) && !defined(_GNU_SOURCE)
#define _GNU_SOURCE /* for setgroups() */
#endif
#if defined(__linux__) && !defined(_XOPEN_SOURCE)
#define _XOPEN_SOURCE 600 /* For flockfile() on Linux */
#endif
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE /* For fseeko(), ftello() */
#endif
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64 /* Use 64-bit file offsets by default */
#endif
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS /* <inttypes.h> wants this for C++ */
#endif
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS /* C++ wants that for INT64_MAX */
#endif
#ifdef __sun
#define __EXTENSIONS__ /* to expose flockfile and friends in stdio.h */
#define __inline inline /* not recognized on older compiler versions */
#endif
#endif
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
#define USE_TIMERS
#endif
#if defined(_MSC_VER)
/* 'type cast' : conversion from 'int' to 'HANDLE' of greater size */
#pragma warning(disable : 4306)
/* conditional expression is constant: introduced by FD_SET(..) */
#pragma warning(disable : 4127)
/* non-constant aggregate initializer: issued due to missing C99 support */
#pragma warning(disable : 4204)
/* padding added after data member */
#pragma warning(disable : 4820)
/* not defined as a preprocessor macro, replacing with '0' for '#if/#elif' */
#pragma warning(disable : 4668)
/* no function prototype given: converting '()' to '(void)' */
#pragma warning(disable : 4255)
/* function has been selected for automatic inline expansion */
#pragma warning(disable : 4711)
#endif
/* This code uses static_assert to check some conditions.
* Unfortunately some compilers still do not support it, so we have a
* replacement function here. */
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
#define mg_static_assert static_assert
#elif defined(__cplusplus) && (__cplusplus >= 201103L)
#define mg_static_assert static_assert
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
#define mg_static_assert _Static_assert
#else
char static_assert_replacement[1];
#define mg_static_assert(cond, txt) \
extern char static_assert_replacement[(cond) ? 1 : -1]
#endif
mg_static_assert(sizeof(int) == 4 || sizeof(int) == 8,
"int data type size check");
mg_static_assert(sizeof(void *) == 4 || sizeof(void *) == 8,
"pointer data type size check");
mg_static_assert(sizeof(void *) >= sizeof(int), "data type size check");
/* mg_static_assert(sizeof(size_t) == 4 || sizeof(size_t) == 8, "size_t data
* type size check"); */
/* DTL -- including winsock2.h works better if lean and mean */
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#if defined(__SYMBIAN32__)
#define NO_SSL /* SSL is not supported */
#define NO_CGI /* CGI is not supported */
#define PATH_MAX FILENAME_MAX
#endif /* __SYMBIAN32__ */
#ifndef IGNORE_UNUSED_RESULT
#define IGNORE_UNUSED_RESULT(a) ((void)((a) && 1))
#endif
#ifndef _WIN32_WCE /* Some ANSI #includes are not available on Windows CE */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif /* !_WIN32_WCE */
#ifdef __MACH__
#define CLOCK_MONOTONIC (1)
#define CLOCK_REALTIME (2)
#include <sys/time.h>
#include <mach/clock.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#include <assert.h>
#include <compat/strl.h>
#include <net/net_compat.h>
/* clock_gettime is not implemented on OSX */
int clock_gettime(int clk_id, struct timespec *t);
int
clock_gettime(int clk_id, struct timespec *t)
{
memset(t, 0, sizeof(*t));
if (clk_id == CLOCK_REALTIME) {
struct timeval now;
int rv = gettimeofday(&now, NULL);
if (rv) {
return rv;
}
t->tv_sec = now.tv_sec;
t->tv_nsec = now.tv_usec * 1000;
return 0;
}
else if (clk_id == CLOCK_MONOTONIC) {
static uint64_t clock_start_time = 0;
static mach_timebase_info_data_t timebase_ifo = { 0, 0 };
uint64_t now = mach_absolute_time();
if (clock_start_time == 0) {
kern_return_t mach_status = mach_timebase_info(&timebase_ifo);
#if defined(DEBUG)
assert(mach_status == KERN_SUCCESS);
#else
/* appease "unused variable" warning for release builds */
(void)mach_status;
#endif
clock_start_time = now;
}
now = (uint64_t)((double)(now - clock_start_time)
* (double)timebase_ifo.numer
/ (double)timebase_ifo.denom);
t->tv_sec = now / 1000000000;
t->tv_nsec = now % 1000000000;
return 0;
}
return -1; /* EINVAL - Clock ID is unknown */
}
#endif
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#ifndef MAX_WORKER_THREADS
#define MAX_WORKER_THREADS (1024 * 64)
#endif
#ifndef SOCKET_TIMEOUT_QUANTUM
#define SOCKET_TIMEOUT_QUANTUM (10000)
#endif
mg_static_assert(MAX_WORKER_THREADS >= 1,
"worker threads must be a positive number");
#if defined(_WIN32) \
&& !defined(__SYMBIAN32__) /* WINDOWS / UNIX include block */
#include <windows.h>
#include <winsock2.h> /* DTL add for SO_EXCLUSIVE */
#include <ws2tcpip.h>
typedef const char *SOCK_OPT_TYPE;
#if !defined(PATH_MAX)
#define PATH_MAX (MAX_PATH)
#endif
#if !defined(PATH_MAX)
#define PATH_MAX (4096)
#endif
mg_static_assert(PATH_MAX >= 1, "path length must be a positive number");
#ifndef _IN_PORT_T
#ifndef in_port_t
#define in_port_t u_short
#endif
#endif
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else /* _WIN32_WCE */
#define NO_CGI /* WinCE has no pipes */
typedef long off_t;
#define errno ((int)(GetLastError()))
#define strerror(x) (_ultoa(x, (char *)_alloca(sizeof(x) * 3), 10))
#endif /* _WIN32_WCE */
#define MAKEUQUAD(lo, hi) \
((uint64_t)(((uint32_t)(lo)) | ((uint64_t)((uint32_t)(hi))) << 32))
#define RATE_DIFF (10000000) /* 100 nsecs */
#define EPOCH_DIFF (MAKEUQUAD(0xd53e8000, 0x019db1de))
#define SYS2UNIX_TIME(lo, hi) \
((time_t)((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF))
/* Visual Studio 6 does not know __func__ or __FUNCTION__
* The rest of MS compilers use __FUNCTION__, not C99 __func__
* Also use _strtoui64 on modern M$ compilers */
#if defined(_MSC_VER)
#if (_MSC_VER < 1300)
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ __FILE__ ":" STR(__LINE__)
#define strtoull(x, y, z) ((unsigned __int64)_atoi64(x))
#define strtoll(x, y, z) (_atoi64(x))
#else
#define __func__ __FUNCTION__
#define strtoull(x, y, z) (_strtoui64(x, y, z))
#define strtoll(x, y, z) (_strtoi64(x, y, z))
#endif
#endif /* _MSC_VER */
#define ERRNO ((int)(GetLastError()))
#define NO_SOCKLEN_T
#define SSL_LIB "ssleay32.dll"
#define CRYPTO_LIB "libeay32.dll"
#define O_NONBLOCK (0)
#ifndef W_OK
#define W_OK (2) /* http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx */
#endif
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif /* !EWOULDBLOCK */
#define _POSIX_
#define INT64_FMT "I64d"
#define UINT64_FMT "I64u"
#define WINCDECL __cdecl
#define SHUT_RD (0)
#define SHUT_WR (1)
#define SHUT_BOTH (2)
#define vsnprintf_impl _vsnprintf
#define access _access
#define mg_sleep(x) (Sleep(x))
#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
#ifndef popen
#define popen(x, y) (_popen(x, y))
#endif
#ifndef pclose
#define pclose(x) (_pclose(x))
#endif
#define close(x) (_close(x))
#define dlsym(x, y) (GetProcAddress((HINSTANCE)(x), (y)))
#define RTLD_LAZY (0)
#define fseeko(x, y, z) (_lseeki64(_fileno(x), (y), (z)) == -1 ? -1 : 0)
#define fdopen(x, y) (_fdopen((x), (y)))
#define write(x, y, z) (_write((x), (y), (unsigned)z))
#define read(x, y, z) (_read((x), (y), (unsigned)z))
#define flockfile(x) (EnterCriticalSection(&global_log_file_lock))
#define funlockfile(x) (LeaveCriticalSection(&global_log_file_lock))
#define sleep(x) (Sleep((x)*1000))
#define rmdir(x) (_rmdir(x))
#define timegm(x) (_mkgmtime(x))
#if !defined(fileno)
#define fileno(x) (_fileno(x))
#endif /* !fileno MINGW #defines fileno */
typedef HANDLE pthread_mutex_t;
typedef DWORD pthread_key_t;
typedef HANDLE pthread_t;
typedef struct {
CRITICAL_SECTION threadIdSec;
int waitingthreadcount; /* The number of threads queued. */
pthread_t *waitingthreadhdls; /* The thread handles. */
} pthread_cond_t;
#ifndef __clockid_t_defined
typedef DWORD clockid_t;
#endif
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC (1)
#endif
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME (2)
#endif
#if defined(_MSC_VER) && (_MSC_VER >= 1900)
#define _TIMESPEC_DEFINED
#endif
#ifndef _TIMESPEC_DEFINED
struct timespec {
time_t tv_sec; /* seconds */
long tv_nsec; /* nanoseconds */
};
#endif
#define pid_t HANDLE /* MINGW typedefs pid_t to int. Using #define here. */
static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
struct file;
static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#define INT64_MAX (9223372036854775807)
#endif /* HAVE_STDINT */
/* POSIX dirent interface */
struct dirent {
char d_name[PATH_MAX];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
#if defined(_WIN32) && !defined(POLLIN)
#ifndef HAVE_POLL
struct pollfd {
SOCKET fd;
short events;
short revents;
};
#define POLLIN (0x0300)
#endif
#endif
/* Mark required libraries */
#if defined(_MSC_VER)
#pragma comment(lib, "Ws2_32.lib")
#endif
#else /* defined(_WIN32) && !defined(__SYMBIAN32__) - WINDOWS / UNIX include \
block */
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>
#include <netinet/tcp.h>
typedef const void *SOCK_OPT_TYPE;
#if defined(ANDROID)
typedef unsigned short int in_port_t;
#endif
#include <pwd.h>
#include <unistd.h>
#include <grp.h>
#include <dirent.h>
#define vsnprintf_impl vsnprintf
#if !defined(NO_SSL_DL) && !defined(NO_SSL)
#include <dlfcn.h>
#endif
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB "libssl.dylib"
#define CRYPTO_LIB "libcrypto.dylib"
#else
#if !defined(SSL_LIB)
#define SSL_LIB "libssl.so"
#endif
#if !defined(CRYPTO_LIB)
#define CRYPTO_LIB "libcrypto.so"
#endif
#endif
#ifndef O_BINARY
#define O_BINARY (0)
#endif /* O_BINARY */
#define closesocket(a) (close(a))
#define mg_mkdir(x, y) (mkdir(x, y))
#define mg_remove(x) (remove(x))
#define mg_sleep(x) (usleep((x)*1000))
#define ERRNO (errno)
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
#define UINT64_FMT PRIu64
typedef int SOCKET;
#define WINCDECL
#if defined(__hpux)
/* HPUX 11 does not have monotonic, fall back to realtime */
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC CLOCK_REALTIME
#endif
/* HPUX defines socklen_t incorrectly as size_t which is 64bit on
* Itanium. Without defining _XOPEN_SOURCE or _XOPEN_SOURCE_EXTENDED
* the prototypes use int* rather than socklen_t* which matches the
* actual library expectation. When called with the wrong size arg
* accept() returns a zero client inet addr and check_acl() always
* fails. Since socklen_t is widely used below, just force replace
* their typedef with int. - DTL
*/
#define socklen_t int
#endif /* hpux */
#endif /* defined(_WIN32) && !defined(__SYMBIAN32__) - WINDOWS / UNIX include \
block */
/* va_copy should always be a macro, C99 and C++11 - DTL */
#ifndef va_copy
#define va_copy(x, y) ((x) = (y))
#endif
#ifdef _WIN32
/* Create substitutes for POSIX functions in Win32. */
#if defined(__MINGW32__)
/* Show no warning in case system functions are not used. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
static CRITICAL_SECTION global_log_file_lock;
static DWORD
pthread_self(void)
{
return GetCurrentThreadId();
}
static int
pthread_key_create(
pthread_key_t *key,
void(*_ignored)(void *) /* destructor not supported for Windows */
)
{
(void)_ignored;
if ((key != 0)) {
*key = TlsAlloc();
return (*key != TLS_OUT_OF_INDEXES) ? 0 : -1;
}
return -2;
}
static int
pthread_key_delete(pthread_key_t key)
{
return TlsFree(key) ? 0 : 1;
}
static int
pthread_setspecific(pthread_key_t key, void *value)
{
return TlsSetValue(key, value) ? 0 : 1;
}
static void *
pthread_getspecific(pthread_key_t key)
{
return TlsGetValue(key);
}
#if defined(__MINGW32__)
/* Enable unused function warning again */
#pragma GCC diagnostic pop
#endif
static struct pthread_mutex_undefined_struct *pthread_mutex_attr = NULL;
#else
static pthread_mutexattr_t pthread_mutex_attr;
#endif /* _WIN32 */
#include "civetweb.h"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE (4096)
#define MAX_CGI_ENVIR_VARS (256)
#define MG_BUF_LEN (8192)
#ifndef MAX_REQUEST_SIZE
#define MAX_REQUEST_SIZE (16384)
#endif
mg_static_assert(MAX_REQUEST_SIZE >= 256,
"request size length must be a positive number");
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#if !defined(DEBUG_TRACE)
#if defined(DEBUG)
static void DEBUG_TRACE_FUNC(const char *func,
unsigned line,
PRINTF_FORMAT_STRING(const char *fmt),
...) PRINTF_ARGS(3, 4);
static void
DEBUG_TRACE_FUNC(const char *func, unsigned line, const char *fmt, ...)
{
va_list args;
flockfile(stdout);
printf("*** %lu.%p.%s.%u: ",
(unsigned long)time(NULL),
(void *)pthread_self(),
func,
line);
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
putchar('\n');
fflush(stdout);
funlockfile(stdout);
}
#define DEBUG_TRACE(fmt, ...) \
DEBUG_TRACE_FUNC(__func__, __LINE__, fmt, __VA_ARGS__)
#else
#define DEBUG_TRACE(fmt, ...) \
do { \
} while (0)
#endif /* DEBUG */
#endif /* DEBUG_TRACE */
#if defined(MEMORY_DEBUGGING)
unsigned long mg_memory_debug_blockCount = 0;
unsigned long mg_memory_debug_totalMemUsed = 0;
static void *
mg_malloc_ex(size_t size, const char *file, unsigned line)
{
void *data = malloc(size + sizeof(size_t));
void *memory = 0;
char mallocStr[256];
if (data) {
*(size_t *)data = size;
mg_memory_debug_totalMemUsed += size;
mg_memory_debug_blockCount++;
memory = (void *)(((char *)data) + sizeof(size_t));
}
sprintf(mallocStr,
"MEM: %p %5lu alloc %7lu %4lu --- %s:%u\n",
memory,
(unsigned long)size,
mg_memory_debug_totalMemUsed,
mg_memory_debug_blockCount,
file,
line);
#if defined(_WIN32)
OutputDebugStringA(mallocStr);
#else
DEBUG_TRACE("%s", mallocStr);
#endif
return memory;
}
static void *
mg_calloc_ex(size_t count, size_t size, const char *file, unsigned line)
{
void *data = mg_malloc_ex(size * count, file, line);
if (data) {
memset(data, 0, size);
}
return data;
}
static void
mg_free_ex(void *memory, const char *file, unsigned line)
{
char mallocStr[256];
void *data = (void *)(((char *)memory) - sizeof(size_t));
size_t size;
if (memory) {
size = *(size_t *)data;
mg_memory_debug_totalMemUsed -= size;
mg_memory_debug_blockCount--;
sprintf(mallocStr,
"MEM: %p %5lu free %7lu %4lu --- %s:%u\n",
memory,
(unsigned long)size,
mg_memory_debug_totalMemUsed,
mg_memory_debug_blockCount,
file,
line);
#if defined(_WIN32)
OutputDebugStringA(mallocStr);
#else
DEBUG_TRACE("%s", mallocStr);
#endif
free(data);
}
}
static void *
mg_realloc_ex(void *memory, size_t newsize, const char *file, unsigned line)
{
char mallocStr[256];
void *data;
void *_realloc;
size_t oldsize;
if (newsize) {
if (memory) {
data = (void *)(((char *)memory) - sizeof(size_t));
oldsize = *(size_t *)data;
_realloc = realloc(data, newsize + sizeof(size_t));
if (_realloc) {
data = _realloc;
mg_memory_debug_totalMemUsed -= oldsize;
sprintf(mallocStr,
"MEM: %p %5lu r-free %7lu %4lu --- %s:%u\n",
memory,
(unsigned long)oldsize,
mg_memory_debug_totalMemUsed,
mg_memory_debug_blockCount,
file,
line);
#if defined(_WIN32)
OutputDebugStringA(mallocStr);
#else
DEBUG_TRACE("%s", mallocStr);
#endif
mg_memory_debug_totalMemUsed += newsize;
sprintf(mallocStr,
"MEM: %p %5lu r-alloc %7lu %4lu --- %s:%u\n",
memory,
(unsigned long)newsize,
mg_memory_debug_totalMemUsed,
mg_memory_debug_blockCount,
file,
line);
#if defined(_WIN32)
OutputDebugStringA(mallocStr);
#else
DEBUG_TRACE("%s", mallocStr);
#endif
*(size_t *)data = newsize;
data = (void *)(((char *)data) + sizeof(size_t));
}
else {
#if defined(_WIN32)
OutputDebugStringA("MEM: realloc failed\n");
#else
DEBUG_TRACE("%s", "MEM: realloc failed\n");
#endif
return _realloc;
}
}
else {
data = mg_malloc_ex(newsize, file, line);
}
}
else {
data = 0;
mg_free_ex(memory, file, line);
}
return data;
}
#define mg_malloc(a) mg_malloc_ex(a, __FILE__, __LINE__)
#define mg_calloc(a, b) mg_calloc_ex(a, b, __FILE__, __LINE__)
#define mg_realloc(a, b) mg_realloc_ex(a, b, __FILE__, __LINE__)
#define mg_free(a) mg_free_ex(a, __FILE__, __LINE__)
#else
static __inline void *
mg_malloc(size_t a)
{
return malloc(a);
}
static __inline void *
mg_calloc(size_t a, size_t b)
{
return calloc(a, b);
}
static __inline void *
mg_realloc(void *a, size_t b)
{
return realloc(a, b);
}
static __inline void
mg_free(void *a)
{
free(a);
}
#endif
static void mg_vsnprintf(const struct mg_connection *conn,
int *truncated,
char *buf,
size_t buflen,
const char *fmt,
va_list ap);
static void mg_snprintf(const struct mg_connection *conn,
int *truncated,
char *buf,
size_t buflen,
PRINTF_FORMAT_STRING(const char *fmt),
...) PRINTF_ARGS(5, 6);
/* This following lines are just meant as a reminder to use the mg-functions
* for memory management */
#ifdef malloc
#undef malloc
#endif
#ifdef calloc
#undef calloc
#endif
#ifdef realloc
#undef realloc
#endif
#ifdef free
#undef free
#endif
#ifdef snprintf
#undef snprintf
#endif
#ifdef vsnprintf
#undef vsnprintf
#endif
/*#define malloc DO_NOT_USE_THIS_FUNCTION__USE_mg_malloc
#define calloc DO_NOT_USE_THIS_FUNCTION__USE_mg_calloc
#define realloc DO_NOT_USE_THIS_FUNCTION__USE_mg_realloc
#define free DO_NOT_USE_THIS_FUNCTION__USE_mg_free
#define snprintf DO_NOT_USE_THIS_FUNCTION__USE_mg_snprintf*/
#ifdef _WIN32 /* vsnprintf must not be used in any system, * \
* but this define only works well for Windows. */
/*#define vsnprintf DO_NOT_USE_THIS_FUNCTION__USE_mg_vsnprintf*/
#endif
#include <rhash.h>
/* Darwin prior to 7.0 and Win32 do not have socklen_t */
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif /* NO_SOCKLEN_T */
#define _DARWIN_UNLIMITED_SELECT
#define IP_ADDR_STR_LEN (50) /* IPv6 hex string is 46 chars */
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL (0)
#endif
#if !defined(SOMAXCONN)
#define SOMAXCONN (100)
#endif
/* Size of the accepted socket queue */
#if !defined(MGSQLEN)
#define MGSQLEN (20)
#endif
#if defined(NO_SSL_DL)
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#else
/* SSL loaded dynamically from DLL.
* I put the prototypes here to be independent from OpenSSL source
* installation. */
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;
typedef struct x509_store_ctx_st X509_STORE_CTX;
#define SSL_CTRL_OPTIONS (32)
#define SSL_CTRL_CLEAR_OPTIONS (77)
#define SSL_CTRL_SET_ECDH_AUTO (94)
#define SSL_VERIFY_NONE (0)
#define SSL_VERIFY_PEER (1)
#define SSL_VERIFY_FAIL_IF_NO_PEER_CERT (2)
#define SSL_VERIFY_CLIENT_ONCE (4)
#define SSL_OP_ALL (0x80000BFFL)
#define SSL_OP_NO_SSLv2 (0x01000000L)
#define SSL_OP_NO_SSLv3 (0x02000000L)
#define SSL_OP_NO_TLSv1 (0x04000000L)
#define SSL_OP_NO_TLSv1_2 (0x08000000L)
#define SSL_OP_NO_TLSv1_1 (0x10000000L)
#define SSL_OP_SINGLE_DH_USE (0x00100000L)
struct ssl_func {
const char *name; /* SSL function name */
void(*ptr)(void); /* Function pointer */
};
#define SSL_free (*(void (*)(SSL *))ssl_sw[0].ptr)
#define SSL_accept (*(int (*)(SSL *))ssl_sw[1].ptr)
#define SSL_connect (*(int (*)(SSL *))ssl_sw[2].ptr)
#define SSL_read (*(int (*)(SSL *, void *, int))ssl_sw[3].ptr)
#define SSL_write (*(int (*)(SSL *, const void *, int))ssl_sw[4].ptr)
#define SSL_get_error (*(int (*)(SSL *, int))ssl_sw[5].ptr)
#define SSL_set_fd (*(int (*)(SSL *, SOCKET))ssl_sw[6].ptr)
#define SSL_new (*(SSL * (*)(SSL_CTX *))ssl_sw[7].ptr)
#define SSL_CTX_new (*(SSL_CTX * (*)(SSL_METHOD *))ssl_sw[8].ptr)
#define SSLv23_server_method (*(SSL_METHOD * (*)(void))ssl_sw[9].ptr)
#define SSL_library_init (*(int (*)(void))ssl_sw[10].ptr)
#define SSL_CTX_use_PrivateKey_file \
(*(int (*)(SSL_CTX *, const char *, int))ssl_sw[11].ptr)
#define SSL_CTX_use_certificate_file \
(*(int (*)(SSL_CTX *, const char *, int))ssl_sw[12].ptr)
#define SSL_CTX_set_default_passwd_cb \
(*(void (*)(SSL_CTX *, mg_callback_t))ssl_sw[13].ptr)
#define SSL_CTX_free (*(void (*)(SSL_CTX *))ssl_sw[14].ptr)
#define SSL_load_error_strings (*(void (*)(void))ssl_sw[15].ptr)
#define SSL_CTX_use_certificate_chain_file \
(*(int (*)(SSL_CTX *, const char *))ssl_sw[16].ptr)
#define SSLv23_client_method (*(SSL_METHOD * (*)(void))ssl_sw[17].ptr)
#define SSL_pending (*(int (*)(SSL *))ssl_sw[18].ptr)
#define SSL_CTX_set_verify \
(*(void (*)(SSL_CTX *, \
int, \
int (*verify_callback)(int, X509_STORE_CTX *)))ssl_sw[19].ptr)
#define SSL_shutdown (*(int (*)(SSL *))ssl_sw[20].ptr)
#define SSL_CTX_load_verify_locations \
(*(int (*)(SSL_CTX *, const char *, const char *))ssl_sw[21].ptr)
#define SSL_CTX_set_default_verify_paths (*(int (*)(SSL_CTX *))ssl_sw[22].ptr)
#define SSL_CTX_set_verify_depth (*(void (*)(SSL_CTX *, int))ssl_sw[23].ptr)
#define SSL_get_peer_certificate (*(X509 * (*)(SSL *))ssl_sw[24].ptr)
#define SSL_get_version (*(const char *(*)(SSL *))ssl_sw[25].ptr)
#define SSL_get_current_cipher (*(SSL_CIPHER * (*)(SSL *))ssl_sw[26].ptr)
#define SSL_CIPHER_get_name \
(*(const char *(*)(const SSL_CIPHER *))ssl_sw[27].ptr)
#define SSL_CTX_check_private_key (*(int (*)(SSL_CTX *))ssl_sw[28].ptr)
#define SSL_CTX_set_session_id_context \
(*(int (*)(SSL_CTX *, const unsigned char *, unsigned int))ssl_sw[29].ptr)
#define SSL_CTX_ctrl (*(long (*)(SSL_CTX *, int, long, void *))ssl_sw[30].ptr)
#define SSL_CTX_set_cipher_list \
(*(int (*)(SSL_CTX *, const char *))ssl_sw[31].ptr)
#define SSL_CTX_set_options(ctx, op) \
SSL_CTX_ctrl((ctx), SSL_CTRL_OPTIONS, (op), NULL)
#define SSL_CTX_clear_options(ctx, op) \
SSL_CTX_ctrl((ctx), SSL_CTRL_CLEAR_OPTIONS, (op), NULL)
#define SSL_CTX_set_ecdh_auto(ctx, onoff) \
SSL_CTX_ctrl(ctx, SSL_CTRL_SET_ECDH_AUTO, onoff, NULL)
#define CRYPTO_num_locks (*(int (*)(void))crypto_sw[0].ptr)
#define CRYPTO_set_locking_callback \
(*(void (*)(void (*)(int, int, const char *, int)))crypto_sw[1].ptr)
#define CRYPTO_set_id_callback \
(*(void (*)(unsigned long (*)(void)))crypto_sw[2].ptr)
#define ERR_get_error (*(unsigned long (*)(void))crypto_sw[3].ptr)
#define ERR_error_string (*(char *(*)(unsigned long, char *))crypto_sw[4].ptr)
#define ERR_remove_state (*(void (*)(unsigned long))crypto_sw[5].ptr)
#define ERR_free_strings (*(void (*)(void))crypto_sw[6].ptr)
#define ENGINE_cleanup (*(void (*)(void))crypto_sw[7].ptr)
#define CONF_modules_unload (*(void (*)(int))crypto_sw[8].ptr)
#define CRYPTO_cleanup_all_ex_data (*(void (*)(void))crypto_sw[9].ptr)
#define EVP_cleanup (*(void (*)(void))crypto_sw[10].ptr)
/* set_ssl_option() function updates this array.
* It loads SSL library dynamically and changes NULLs to the actual addresses
* of respective functions. The macros above (like SSL_connect()) are really
* just calling these functions indirectly via the pointer. */
static struct ssl_func ssl_sw[] = { { "SSL_free", NULL },
{ "SSL_accept", NULL },
{ "SSL_connect", NULL },
{ "SSL_read", NULL },
{ "SSL_write", NULL },
{ "SSL_get_error", NULL },
{ "SSL_set_fd", NULL },
{ "SSL_new", NULL },
{ "SSL_CTX_new", NULL },
{ "SSLv23_server_method", NULL },
{ "SSL_library_init", NULL },
{ "SSL_CTX_use_PrivateKey_file", NULL },
{ "SSL_CTX_use_certificate_file", NULL },
{ "SSL_CTX_set_default_passwd_cb", NULL },
{ "SSL_CTX_free", NULL },
{ "SSL_load_error_strings", NULL },
{ "SSL_CTX_use_certificate_chain_file", NULL },
{ "SSLv23_client_method", NULL },
{ "SSL_pending", NULL },
{ "SSL_CTX_set_verify", NULL },
{ "SSL_shutdown", NULL },
{ "SSL_CTX_load_verify_locations", NULL },
{ "SSL_CTX_set_default_verify_paths", NULL },
{ "SSL_CTX_set_verify_depth", NULL },
{ "SSL_get_peer_certificate", NULL },
{ "SSL_get_version", NULL },
{ "SSL_get_current_cipher", NULL },
{ "SSL_CIPHER_get_name", NULL },
{ "SSL_CTX_check_private_key", NULL },
{ "SSL_CTX_set_session_id_context", NULL },
{ "SSL_CTX_ctrl", NULL },
{ "SSL_CTX_set_cipher_list", NULL },
{ NULL, NULL } };
/* Similar array as ssl_sw. These functions could be located in different
* lib. */
#if !defined(NO_SSL)
static struct ssl_func crypto_sw[] = { { "CRYPTO_num_locks", NULL },
{ "CRYPTO_set_locking_callback", NULL },
{ "CRYPTO_set_id_callback", NULL },
{ "ERR_get_error", NULL },
{ "ERR_error_string", NULL },
{ "ERR_remove_state", NULL },
{ "ERR_free_strings", NULL },
{ "ENGINE_cleanup", NULL },
{ "CONF_modules_unload", NULL },
{ "CRYPTO_cleanup_all_ex_data", NULL },
{ "EVP_cleanup", NULL },
{ NULL, NULL } };
#endif /* NO_SSL */
#endif /* NO_SSL_DL */
static const char *month_names[] = { "Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec" };
/* Unified socket address. For IPv6 support, add IPv6 address structure in the
* union u. */
union usa {
struct sockaddr sa;
struct sockaddr_in sin;
#if defined(USE_IPV6)
struct sockaddr_in6 sin6;
#endif
};
/* Describes a string (chunk of memory). */
struct vec {
const char *ptr;
size_t len;
};
struct file {
uint64_t size;
time_t last_modified;
FILE *fp;
const char *membuf; /* Non-NULL if file data is in memory */
int is_directory;
int gzipped; /* set to 1 if the content is gzipped
* in which case we need a content-encoding: gzip header */
};
#define STRUCT_FILE_INITIALIZER \
{ \
(uint64_t)0, (time_t)0, (FILE *)NULL, (const char *)NULL, 0, 0 \
}
/* Describes listening socket, or socket which was accept()-ed by the master
* thread and queued for future handling by the worker thread. */
struct socket {
SOCKET sock; /* Listening socket */
union usa lsa; /* Local socket address */
union usa rsa; /* Remote socket address */
unsigned char is_ssl; /* Is port SSL-ed */
unsigned char ssl_redir; /* Is port supposed to redirect everything to SSL
* port */
};
/* NOTE(lsm): this enum shoulds be in sync with the config_options below. */
enum {
CGI_EXTENSIONS,
CGI_ENVIRONMENT,
PUT_DELETE_PASSWORDS_FILE,
CGI_INTERPRETER,
PROTECT_URI,
AUTHENTICATION_DOMAIN,
SSI_EXTENSIONS,
THROTTLE,
ACCESS_LOG_FILE,
ENABLE_DIRECTORY_LISTING,
ERROR_LOG_FILE,
GLOBAL_PASSWORDS_FILE,
INDEX_FILES,
ENABLE_KEEP_ALIVE,
ACCESS_CONTROL_LIST,
EXTRA_MIME_TYPES,
LISTENING_PORTS,
DOCUMENT_ROOT,
SSL_CERTIFICATE,
NUM_THREADS,
RUN_AS_USER,
REWRITE,
HIDE_FILES,
REQUEST_TIMEOUT,
SSL_DO_VERIFY_PEER,
SSL_CA_PATH,
SSL_CA_FILE,
SSL_VERIFY_DEPTH,
SSL_DEFAULT_VERIFY_PATHS,
SSL_CIPHER_LIST,
SSL_PROTOCOL_VERSION,
#if defined(USE_WEBSOCKET)
WEBSOCKET_TIMEOUT,
#endif
DECODE_URL,
#if defined(USE_LUA)
LUA_PRELOAD_FILE,
LUA_SCRIPT_EXTENSIONS,
LUA_SERVER_PAGE_EXTENSIONS,
#endif
#if defined(USE_DUKTAPE)
DUKTAPE_SCRIPT_EXTENSIONS,
#endif
#if defined(USE_WEBSOCKET)
WEBSOCKET_ROOT,
#endif
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
LUA_WEBSOCKET_EXTENSIONS,
#endif
ACCESS_CONTROL_ALLOW_ORIGIN,
ERROR_PAGES,
CONFIG_TCP_NODELAY, /* Prepended CONFIG_ to avoid conflict with the
* socket option typedef TCP_NODELAY. */
STATIC_FILE_MAX_AGE,
NUM_OPTIONS
};
/* Config option name, config types, default value */
static struct mg_option config_options[] = {
{ "cgi_pattern", CONFIG_TYPE_EXT_PATTERN, "**.cgi$|**.pl$|**.php$" },
{ "cgi_environment", CONFIG_TYPE_STRING, NULL },
{ "put_delete_auth_file", CONFIG_TYPE_FILE, NULL },
{ "cgi_interpreter", CONFIG_TYPE_FILE, NULL },
{ "protect_uri", CONFIG_TYPE_STRING, NULL },
{ "authentication_domain", CONFIG_TYPE_STRING, "mydomain.com" },
{ "ssi_pattern", CONFIG_TYPE_EXT_PATTERN, "**.shtml$|**.shtm$" },
{ "throttle", CONFIG_TYPE_STRING, NULL },
{ "access_log_file", CONFIG_TYPE_FILE, NULL },
{ "enable_directory_listing", CONFIG_TYPE_BOOLEAN, "yes" },
{ "error_log_file", CONFIG_TYPE_FILE, NULL },
{ "global_auth_file", CONFIG_TYPE_FILE, NULL },
{ "index_files",
CONFIG_TYPE_STRING,
#ifdef USE_LUA
"index.xhtml,index.html,index.htm,index.lp,index.lsp,index.lua,index.cgi,"
"index.shtml,index.php" },
#else
"index.xhtml,index.html,index.htm,index.cgi,index.shtml,index.php" },
#endif
{ "enable_keep_alive", CONFIG_TYPE_BOOLEAN, "no" },
{ "access_control_list", CONFIG_TYPE_STRING, NULL },
{ "extra_mime_types", CONFIG_TYPE_STRING, NULL },
{ "listening_ports", CONFIG_TYPE_STRING, "8080" },
{ "document_root", CONFIG_TYPE_DIRECTORY, NULL },
{ "ssl_certificate", CONFIG_TYPE_FILE, NULL },
{ "num_threads", CONFIG_TYPE_NUMBER, "50" },
{ "run_as_user", CONFIG_TYPE_STRING, NULL },
{ "url_rewrite_patterns", CONFIG_TYPE_STRING, NULL },
{ "hide_files_patterns", CONFIG_TYPE_EXT_PATTERN, NULL },
{ "request_timeout_ms", CONFIG_TYPE_NUMBER, "30000" },
{ "ssl_verify_peer", CONFIG_TYPE_BOOLEAN, "no" },
{ "ssl_ca_path", CONFIG_TYPE_DIRECTORY, NULL },
{ "ssl_ca_file", CONFIG_TYPE_FILE, NULL },
{ "ssl_verify_depth", CONFIG_TYPE_NUMBER, "9" },
{ "ssl_default_verify_paths", CONFIG_TYPE_BOOLEAN, "yes" },
{ "ssl_cipher_list", CONFIG_TYPE_STRING, NULL },
{ "ssl_protocol_version", CONFIG_TYPE_NUMBER, "0" },
#if defined(USE_WEBSOCKET)
{ "websocket_timeout_ms", CONFIG_TYPE_NUMBER, "30000" },
#endif
{ "decode_url", CONFIG_TYPE_BOOLEAN, "yes" },
#if defined(USE_LUA)
{ "lua_preload_file", CONFIG_TYPE_FILE, NULL },
{ "lua_script_pattern", CONFIG_TYPE_EXT_PATTERN, "**.lua$" },
{ "lua_server_page_pattern", CONFIG_TYPE_EXT_PATTERN, "**.lp$|**.lsp$" },
#endif
#if defined(USE_DUKTAPE)
{ "_experimental_duktape_script_pattern",
CONFIG_TYPE_EXT_PATTERN,
"**.ssjs$" }, /* TODO: redefine parameter */
#endif
#if defined(USE_WEBSOCKET)
{ "websocket_root", CONFIG_TYPE_DIRECTORY, NULL },
#endif
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
{ "lua_websocket_pattern", CONFIG_TYPE_EXT_PATTERN, "**.lua$" },
#endif
{ "access_control_allow_origin", CONFIG_TYPE_STRING, "*" },
{ "error_pages", CONFIG_TYPE_DIRECTORY, NULL },
{ "tcp_nodelay", CONFIG_TYPE_NUMBER, "0" },
{ "_experimental_static_file_max_age",
CONFIG_TYPE_NUMBER,
"3600" }, /* TODO: redefine parameter */
{ NULL, CONFIG_TYPE_UNKNOWN, NULL }};
/* Check if the config_options and the corresponding enum have compatible
* sizes. */
mg_static_assert((sizeof(config_options) / sizeof(config_options[0]))
== (NUM_OPTIONS + 1),
"config_options and enum not sync");
enum { REQUEST_HANDLER, WEBSOCKET_HANDLER, AUTH_HANDLER };
struct mg_handler_info {
/* Name/Pattern of the URI. */
char *uri;
size_t uri_len;
/* handler type */
int handler_type;
/* Handler for http/https or authorization requests. */
mg_request_handler handler;
/* Handler for ws/wss (websocket) requests. */
mg_websocket_connect_handler connect_handler;
mg_websocket_ready_handler ready_handler;
mg_websocket_data_handler data_handler;
mg_websocket_close_handler close_handler;
/* Handler for authorization requests */
mg_authorization_handler auth_handler;
/* User supplied argument for the handler function. */
void *cbdata;
/* next handler in a linked list */
struct mg_handler_info *next;
};
struct mg_context {
volatile int stop_flag; /* Should we stop event loop */
SSL_CTX *ssl_ctx; /* SSL context */
char *config[NUM_OPTIONS]; /* Civetweb configuration parameters */
struct mg_callbacks callbacks; /* User-defined callback function */
void *user_data; /* User-defined data */
int context_type; /* 1 = server context, 2 = client context */
struct socket *listening_sockets;
in_port_t *listening_ports;
unsigned int num_listening_sockets;
volatile int
running_worker_threads; /* Number of currently running worker threads */
pthread_mutex_t thread_mutex; /* Protects (max|num)_threads */
pthread_cond_t thread_cond; /* Condvar for tracking workers terminations */
struct socket queue[MGSQLEN]; /* Accepted sockets */
volatile int sq_head; /* Head of the socket queue */
volatile int sq_tail; /* Tail of the socket queue */
pthread_cond_t sq_full; /* Signaled when socket is produced */
pthread_cond_t sq_empty; /* Signaled when socket is consumed */
pthread_t masterthreadid; /* The master thread ID */
unsigned int
cfg_worker_threads; /* The number of configured worker threads. */
pthread_t *workerthreadids; /* The worker thread IDs */
time_t start_time; /* Server start time, used for authentication */
uint64_t auth_nonce_mask; /* Mask for all nonce values */
pthread_mutex_t nonce_mutex; /* Protects nonce_count */
unsigned long nonce_count; /* Used nonces, used for authentication */
char *systemName; /* What operating system is running */
/* linked list of uri handlers */
struct mg_handler_info *handlers;
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
/* linked list of shared lua websockets */
struct mg_shared_lua_websocket_list *shared_lua_websockets;
#endif
#ifdef USE_TIMERS
struct ttimers *timers;
#endif
};
struct mg_connection {
struct mg_request_info request_info;
struct mg_context *ctx;
SSL *ssl; /* SSL descriptor */
SSL_CTX *client_ssl_ctx; /* SSL context for client connections */
struct socket client; /* Connected client */
time_t conn_birth_time; /* Time (wall clock) when connection was
* established */
struct timespec req_time; /* Time (since system start) when the request
* was received */
int64_t num_bytes_sent; /* Total bytes sent to client */
int64_t content_len; /* Content-Length header value */
int64_t consumed_content; /* How many bytes of content have been read */
int is_chunked; /* Transfer-Encoding is chunked: 0=no, 1=yes:
* data available, 2: all data read */
size_t chunk_remainder; /* Unread data from the last chunk */
char *buf; /* Buffer for received data */
char *path_info; /* PATH_INFO part of the URL */
int must_close; /* 1 if connection must be closed */
int in_error_handler; /* 1 if in handler for user defined error
* pages */
int internal_error; /* 1 if an error occured while processing the
* request */
int buf_size; /* Buffer size */
int request_len; /* Size of the request + headers in a buffer */
int data_len; /* Total size of data in a buffer */
int status_code; /* HTTP reply status code, e.g. 200 */
int throttle; /* Throttling, bytes/sec. <= 0 means no
* throttle */
time_t last_throttle_time; /* Last time throttled data was sent */
int64_t last_throttle_bytes; /* Bytes sent this second */
pthread_mutex_t mutex; /* Used by mg_(un)lock_connection to ensure
* atomic transmissions for websockets */
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
void *lua_websocket_state; /* Lua_State for a websocket connection */
#endif
};
static pthread_key_t sTlsKey; /* Thread local storage index */
static int sTlsInit = 0;
static int thread_idx_max = 0;
struct mg_workerTLS {
int is_master;
unsigned long thread_idx;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
HANDLE pthread_cond_helper_mutex;
#endif
};
/* Directory entry */
struct de {
struct mg_connection *conn;
char *file_name;
struct file file;
};
#if defined(USE_WEBSOCKET)
static int is_websocket_protocol(const struct mg_connection *conn);
#else
#define is_websocket_protocol(conn) (0)
#endif
static int
mg_atomic_inc(volatile int *addr)
{
int ret;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
/* Depending on the SDK, this function uses either
* (volatile unsigned int *) or (volatile LONG *),
* so whatever you use, the other SDK is likely to raise a warning. */
ret = InterlockedIncrement((volatile long *)addr);
#elif defined(__GNUC__) \
&& ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 0)))
ret = __sync_add_and_fetch(addr, 1);
#else
ret = (++(*addr));
#endif
return ret;
}
static int
mg_atomic_dec(volatile int *addr)
{
int ret;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
/* Depending on the SDK, this function uses either
* (volatile unsigned int *) or (volatile LONG *),
* so whatever you use, the other SDK is likely to raise a warning. */
ret = InterlockedDecrement((volatile long *)addr);
#elif defined(__GNUC__) \
&& ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 0)))
ret = __sync_sub_and_fetch(addr, 1);
#else
ret = (--(*addr));
#endif
return ret;
}
#if !defined(NO_THREAD_NAME)
#if defined(_WIN32) && defined(_MSC_VER)
/* Set the thread name for debugging purposes in Visual Studio
* http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
*/
#pragma pack(push, 8)
typedef struct tagTHREADNAME_INFO {
DWORD dwType; /* Must be 0x1000. */
LPCSTR szName; /* Pointer to name (in user addr space). */
DWORD dwThreadID; /* Thread ID (-1=caller thread). */
DWORD dwFlags; /* Reserved for future use, must be zero. */
} THREADNAME_INFO;
#pragma pack(pop)
#elif defined(__linux__)
#include <sys/prctl.h>
#include <sys/sendfile.h>
#endif
static void
mg_set_thread_name(const char *name)
{
char threadName[16 + 1]; /* 16 = Max. thread length in Linux/OSX/.. */
mg_snprintf(
NULL, NULL, threadName, sizeof(threadName), "civetweb-%s", name);
#if defined(_WIN32)
#if defined(_MSC_VER)
/* Windows and Visual Studio Compiler */
__try
{
THREADNAME_INFO info;
info.dwType = 0x1000;
info.szName = threadName;
info.dwThreadID = ~0U;
info.dwFlags = 0;
RaiseException(0x406D1388,
0,
sizeof(info) / sizeof(ULONG_PTR),
(ULONG_PTR *)&info);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
}
#elif defined(__MINGW32__)
/* No option known to set thread name for MinGW */
#endif
#elif defined(__GLIBC__) \
&& ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 12)))
/* pthread_setname_np first appeared in glibc in version 2.12*/
(void)pthread_setname_np(pthread_self(), threadName);
#elif defined(__linux__)
/* on linux we can use the old prctl function */
(void)prctl(PR_SET_NAME, threadName, 0, 0, 0);
#endif
}
#else /* !defined(NO_THREAD_NAME) */
void
mg_set_thread_name(const char *threadName)
{
}
#endif
#if defined(MG_LEGACY_INTERFACE)
const char **
mg_get_valid_option_names(void)
{
/* This function is deprecated. Use mg_get_valid_options instead. */
static const char *
data[2 * sizeof(config_options) / sizeof(config_options[0])] = { 0 };
int i;
for (i = 0; config_options[i].name != NULL; i++) {
data[i * 2] = config_options[i].name;
data[i * 2 + 1] = config_options[i].default_value;
}
return data;
}
#endif
const struct mg_option *
mg_get_valid_options(void)
{
return config_options;
}
static int
is_file_in_memory(const struct mg_connection *conn,
const char *path,
struct file *filep)
{
size_t size = 0;
if (!conn || !filep) {
return 0;
}
if (conn->ctx->callbacks.open_file) {
filep->membuf = conn->ctx->callbacks.open_file(conn, path, &size);
if (filep->membuf != NULL) {
/* NOTE: override filep->size only on success. Otherwise, it might
* break constructs like if (!mg_stat() || !mg_fopen()) ... */
filep->size = size;
}
}
return filep->membuf != NULL;
}
static int
is_file_opened(const struct file *filep)
{
if (!filep) {
return 0;
}
return filep->membuf != NULL || filep->fp != NULL;
}
static int
mg_fopen(const struct mg_connection *conn,
const char *path,
const char *mode,
struct file *filep)
{
struct stat st;
if (!filep) {
return 0;
}
/* TODO (high): mg_fopen should only open a file, while mg_stat should
* only get the file status. They should not work on different members of
* the same structure (bad cohesion). */
memset(filep, 0, sizeof(*filep));
if (stat(path, &st) == 0) {
filep->size = (uint64_t)(st.st_size);
}
if (!is_file_in_memory(conn, path, filep)) {
#ifdef _WIN32
wchar_t wbuf[PATH_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
filep->fp = _wfopen(wbuf, wmode);
#else
/* Linux et al already use unicode. No need to convert. */
filep->fp = fopen(path, mode);
#endif
}
return is_file_opened(filep);
}
static void
mg_fclose(struct file *filep)
{
if (filep != NULL && filep->fp != NULL) {
fclose(filep->fp);
}
}
static void
mg_strlcpy(register char *dst, register const char *src, size_t n)
{
for (; *src != '\0' && n > 1; n--) {
*dst++ = *src++;
}
*dst = '\0';
}
static int
lowercase(const char *s)
{
return tolower(*(const unsigned char *)s);
}
int
mg_strncasecmp(const char *s1, const char *s2, size_t len)
{
int diff = 0;
if (len > 0) {
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0' && --len > 0);
}
return diff;
}
static int
mg_strcasecmp(const char *s1, const char *s2)
{
int diff;
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0');
return diff;
}
static char *
mg_strndup(const char *ptr, size_t len)
{
char *p;
if ((p = (char *)mg_malloc(len + 1)) != NULL) {
mg_strlcpy(p, ptr, len + 1);
}
return p;
}
static char *
mg_strdup(const char *str)
{
return mg_strndup(str, strlen(str));
}
static const char *
mg_strcasestr(const char *big_str, const char *small_str)
{
size_t i, big_len = strlen(big_str), small_len = strlen(small_str);
if (big_len >= small_len) {
for (i = 0; i <= (big_len - small_len); i++) {
if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
return big_str + i;
}
}
}
return NULL;
}
/* Return null terminated string of given maximum length.
* Report errors if length is exceeded. */
static void
mg_vsnprintf(const struct mg_connection *conn,
int *truncated,
char *buf,
size_t buflen,
const char *fmt,
va_list ap)
{
int n, ok;
if (buflen == 0) {
return;
}
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-nonliteral"
/* Using fmt as a non-literal is intended here, since it is mostly called
* indirectly by mg_snprintf */
#endif
n = (int)vsnprintf_impl(buf, buflen, fmt, ap);
ok = (n >= 0) && ((size_t)n < buflen);
#ifdef __clang__
#pragma clang diagnostic pop
#endif
if (ok) {
if (truncated) {
*truncated = 0;
}
}
else {
if (truncated) {
*truncated = 1;
}
mg_cry(conn,
"truncating vsnprintf buffer: [%.*s]",
(int)((buflen > 200) ? 200 : (buflen - 1)),
buf);
n = (int)buflen - 1;
}
buf[n] = '\0';
}
static void
mg_snprintf(const struct mg_connection *conn,
int *truncated,
char *buf,
size_t buflen,
const char *fmt,
...)
{
va_list ap;
va_start(ap, fmt);
mg_vsnprintf(conn, truncated, buf, buflen, fmt, ap);
va_end(ap);
}
static int
get_option_index(const char *name)
{
int i;
for (i = 0; config_options[i].name != NULL; i++) {
if (strcmp(config_options[i].name, name) == 0) {
return i;
}
}
return -1;
}
const char *
mg_get_option(const struct mg_context *ctx, const char *name)
{
int i;
if ((i = get_option_index(name)) == -1) {
return NULL;
}
else if (!ctx || ctx->config[i] == NULL) {
return "";
}
else {
return ctx->config[i];
}
}
struct mg_context *
mg_get_context(const struct mg_connection *conn)
{
return (conn == NULL) ? (struct mg_context *)NULL : (conn->ctx);
}
void *
mg_get_user_data(const struct mg_context *ctx)
{
return (ctx == NULL) ? NULL : ctx->user_data;
}
void
mg_set_user_connection_data(const struct mg_connection *conn, void *data)
{
if (conn != NULL) {
((struct mg_connection *)conn)->request_info.conn_data = data;
}
}
void *
mg_get_user_connection_data(const struct mg_connection *conn)
{
if (conn != NULL) {
return conn->request_info.conn_data;
}
return NULL;
}
size_t
mg_get_ports(const struct mg_context *ctx, size_t size, int *ports, int *ssl)
{
size_t i;
if (!ctx) {
return 0;
}
for (i = 0; i < size && i < ctx->num_listening_sockets; i++) {
ssl[i] = ctx->listening_sockets[i].is_ssl;
ports[i] = ctx->listening_ports[i];
}
return i;
}
int
mg_get_server_ports(const struct mg_context *ctx,
int size,
struct mg_server_ports *ports)
{
int i, cnt = 0;
if (size <= 0) {
return -1;
}
memset(ports, 0, sizeof(*ports) * (size_t)size);
if (!ctx) {
return -1;
}
if (!ctx->listening_sockets || !ctx->listening_ports) {
return -1;
}
for (i = 0; (i < size) && (i < (int)ctx->num_listening_sockets); i++) {
ports[cnt].port = ctx->listening_ports[i];
ports[cnt].is_ssl = ctx->listening_sockets[i].is_ssl;
ports[cnt].is_redirect = ctx->listening_sockets[i].ssl_redir;
if (ctx->listening_sockets[i].lsa.sa.sa_family == AF_INET) {
/* IPv4 */
ports[cnt].protocol = 1;
cnt++;
}
else if (ctx->listening_sockets[i].lsa.sa.sa_family == AF_INET6) {
/* IPv6 */
ports[cnt].protocol = 3;
cnt++;
}
}
return cnt;
}
static void
sockaddr_to_string(char *buf, size_t len, const union usa *usa)
{
buf[0] = '\0';
if (!usa) {
return;
}
if (usa->sa.sa_family == AF_INET) {
getnameinfo(&usa->sa,
sizeof(usa->sin),
buf,
(unsigned)len,
NULL,
0,
NI_NUMERICHOST);
}
#if defined(USE_IPV6)
else if (usa->sa.sa_family == AF_INET6) {
getnameinfo(&usa->sa,
sizeof(usa->sin6),
buf,
(unsigned)len,
NULL,
0,
NI_NUMERICHOST);
}
#endif
}
/* Convert time_t to a string. According to RFC2616, Sec 14.18, this must be
* included in all responses other than 100, 101, 5xx. */
static void
gmt_time_string(char *buf, size_t buf_len, time_t *t)
{
struct tm *tm;
tm = gmtime(t);
if (tm != NULL) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", tm);
}
else {
mg_strlcpy(buf, "Thu, 01 Jan 1970 00:00:00 GMT", buf_len);
buf[buf_len - 1] = '\0';
}
}
/* difftime for struct timespec. Return value is in seconds. */
static double
mg_difftimespec(const struct timespec *ts_now, const struct timespec *ts_before)
{
return (double)(ts_now->tv_nsec - ts_before->tv_nsec) * 1.0E-9
+ (double)(ts_now->tv_sec - ts_before->tv_sec);
}
/* Print error message to the opened error log stream. */
void
mg_cry(const struct mg_connection *conn, const char *fmt, ...)
{
char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN];
va_list ap;
struct file fi;
time_t timestamp;
va_start(ap, fmt);
IGNORE_UNUSED_RESULT(vsnprintf_impl(buf, sizeof(buf), fmt, ap));
va_end(ap);
buf[sizeof(buf) - 1] = 0;
if (!conn) {
puts(buf);
return;
}
/* Do not lock when getting the callback value, here and below.
* I suppose this is fine, since function cannot disappear in the
* same way string option can. */
if ((conn->ctx->callbacks.log_message == NULL)
|| (conn->ctx->callbacks.log_message(conn, buf) == 0)) {
if (conn->ctx->config[ERROR_LOG_FILE] != NULL) {
if (mg_fopen(conn, conn->ctx->config[ERROR_LOG_FILE], "a+", &fi)
== 0) {
fi.fp = NULL;
}
}
else {
fi.fp = NULL;
}
if (fi.fp != NULL) {
flockfile(fi.fp);
timestamp = time(NULL);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fi.fp,
"[%010lu] [error] [client %s] ",
(unsigned long)timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
fprintf(fi.fp,
"%s %s: ",
conn->request_info.request_method,
conn->request_info.request_uri);
}
fprintf(fi.fp, "%s", buf);
fputc('\n', fi.fp);
fflush(fi.fp);
funlockfile(fi.fp);
mg_fclose(&fi);
}
}
}
/* Return fake connection structure. Used for logging, if connection
* is not applicable at the moment of logging. */
static struct mg_connection *
fc(struct mg_context *ctx)
{
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return &fake_connection;
}
const char *
mg_version(void)
{
return CIVETWEB_VERSION;
}
const struct mg_request_info *
mg_get_request_info(const struct mg_connection *conn)
{
if (!conn) {
return NULL;
}
return &conn->request_info;
}
/* Skip the characters until one of the delimiters characters found.
* 0-terminate resulting word. Skip the delimiter and following whitespaces.
* Advance pointer to buffer to the next word. Return found 0-terminated word.
* Delimiters can be quoted with quotechar. */
static char *
skip_quoted(char **buf,
const char *delimiters,
const char *whitespace,
char quotechar)
{
char *p, *begin_word, *end_word, *end_whitespace;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
/* Check for quotechar */
if (end_word > begin_word) {
p = end_word - 1;
while (*p == quotechar) {
/* While the delimiter is quoted, look for the next delimiter. */
/* This happens, e.g., in calls from parse_auth_header,
* if the user name contains a " character. */
/* If there is anything beyond end_word, copy it. */
if (*end_word != '\0') {
size_t end_off = strcspn(end_word + 1, delimiters);
memmove(p, end_word, end_off + 1);
p += end_off; /* p must correspond to end_word - 1 */
end_word += end_off + 1;
}
else {
*p = '\0';
break;
}
}
for (p++; p < end_word; p++) {
*p = '\0';
}
}
if (*end_word == '\0') {
*buf = end_word;
}
else {
end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
for (p = end_word; p < end_whitespace; p++) {
*p = '\0';
}
*buf = end_whitespace;
}
return begin_word;
}
/* Simplified version of skip_quoted without quote char
* and whitespace == delimiters */
static char *
skip(char **buf, const char *delimiters)
{
return skip_quoted(buf, delimiters, delimiters, 0);
}
/* Return HTTP header value, or NULL if not found. */
static const char *
get_header(const struct mg_request_info *ri, const char *name)
{
int i;
if (ri) {
for (i = 0; i < ri->num_headers; i++) {
if (!mg_strcasecmp(name, ri->http_headers[i].name)) {
return ri->http_headers[i].value;
}
}
}
return NULL;
}
const char *
mg_get_header(const struct mg_connection *conn, const char *name)
{
if (!conn) {
return NULL;
}
return get_header(&conn->request_info, name);
}
/* A helper function for traversing a comma separated list of values.
* It returns a list pointer shifted to the next value, or NULL if the end
* of the list found.
* Value is stored in val vector. If value has form "x=y", then eq_val
* vector is initialized to point to the "y" part, and val vector length
* is adjusted to point only to "x". */
static const char *
next_option(const char *list, struct vec *val, struct vec *eq_val)
{
if (val == NULL || list == NULL || *list == '\0') {
/* End of the list */
list = NULL;
}
else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
/* Comma found. Store length and shift the list ptr */
val->len = ((size_t)(list - val->ptr));
list++;
}
else {
/* This value is the last one */
list = val->ptr + strlen(val->ptr);
val->len = ((size_t)(list - val->ptr));
}
if (eq_val != NULL) {
/* Value has form "x=y", adjust pointers and lengths
* so that val points to "x", and eq_val points to "y". */
eq_val->len = 0;
eq_val->ptr = (const char *)memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; /* Skip over '=' character */
eq_val->len = ((size_t)(val->ptr - eq_val->ptr)) + val->len;
val->len = ((size_t)(eq_val->ptr - val->ptr)) - 1;
}
}
}
return list;
}
/* Perform case-insensitive match of string against pattern */
static int
match_prefix(const char *pattern, size_t pattern_len, const char *str)
{
const char *or_str;
size_t i;
int j, len, res;
if ((or_str = (const char *)memchr(pattern, '|', pattern_len)) != NULL) {
res = match_prefix(pattern, (size_t)(or_str - pattern), str);
return res > 0 ? res : match_prefix(or_str + 1,
(size_t)((pattern + pattern_len)
- (or_str + 1)),
str);
}
for (i = 0, j = 0; i < pattern_len; i++, j++) {
if (pattern[i] == '?' && str[j] != '\0') {
continue;
}
else if (pattern[i] == '$') {
return str[j] == '\0' ? j : -1;
}
else if (pattern[i] == '*') {
i++;
if (pattern[i] == '*') {
i++;
len = (int)strlen(str + j);
}
else {
len = (int)strcspn(str + j, "/");
}
if (i == pattern_len) {
return j + len;
}
do {
res = match_prefix(pattern + i, pattern_len - i, str + j + len);
} while (res == -1 && len-- > 0);
return res == -1 ? -1 : j + res + len;
}
else if (lowercase(&pattern[i]) != lowercase(&str[j])) {
return -1;
}
}
return j;
}
/* HTTP 1.1 assumes keep alive if "Connection:" header is not set
* This function must tolerate situations when connection info is not
* set up, for example if request parsing failed. */
static int
should_keep_alive(const struct mg_connection *conn)
{
if (conn != NULL) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
if (conn->must_close || conn->internal_error || conn->status_code == 401
|| mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0
|| (header != NULL && mg_strcasecmp(header, "keep-alive") != 0)
|| (header == NULL && http_version
&& 0 != strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
return 0;
}
static int
should_decode_url(const struct mg_connection *conn)
{
if (!conn || !conn->ctx) {
return 0;
}
return (mg_strcasecmp(conn->ctx->config[DECODE_URL], "yes") == 0);
}
static const char *
suggest_connection_header(const struct mg_connection *conn)
{
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static int
send_no_cache_header(struct mg_connection *conn)
{
/* Send all current and obsolete cache opt-out directives. */
return mg_printf(conn,
"Cache-Control: no-cache, no-store, "
"must-revalidate, private, max-age=0\r\n"
"Pragma: no-cache\r\n"
"Expires: 0\r\n");
}
static int
send_static_cache_header(struct mg_connection *conn)
{
/* Read the server config to check how long a file may be cached.
* The configuration is in seconds. */
int max_age = atoi(conn->ctx->config[STATIC_FILE_MAX_AGE]);
if (max_age <= 0) {
/* 0 means "do not cache". All values <0 are reserved
* and may be used differently in the future. */
/* If a file should not be cached, do not only send
* max-age=0, but also pragmas and Expires headers. */
return send_no_cache_header(conn);
}
/* Use "Cache-Control: max-age" instead of "Expires" header.
* Reason: see https://www.mnot.net/blog/2007/05/15/expires_max-age */
/* See also https://www.mnot.net/cache_docs/ */
return mg_printf(conn, "Cache-Control: max-age=%u\r\n", (unsigned)max_age);
}
static void handle_file_based_request(struct mg_connection *conn,
const char *path,
struct file *filep);
static int
mg_stat(struct mg_connection *conn, const char *path, struct file *filep);
static const char *
mg_get_response_code_text(int response_code, struct mg_connection *conn)
{
/* See IANA HTTP status code assignment:
* http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
*/
switch (response_code) {
/* RFC2616 Section 10.1 - Informational 1xx */
case 100:
return "Continue"; /* RFC2616 Section 10.1.1 */
case 101:
return "Switching Protocols"; /* RFC2616 Section 10.1.2 */
case 102:
return "Processing"; /* RFC2518 Section 10.1 */
/* RFC2616 Section 10.2 - Successful 2xx */
case 200:
return "OK"; /* RFC2616 Section 10.2.1 */
case 201:
return "Created"; /* RFC2616 Section 10.2.2 */
case 202:
return "Accepted"; /* RFC2616 Section 10.2.3 */
case 203:
return "Non-Authoritative Information"; /* RFC2616 Section 10.2.4 */
case 204:
return "No Content"; /* RFC2616 Section 10.2.5 */
case 205:
return "Reset Content"; /* RFC2616 Section 10.2.6 */
case 206:
return "Partial Content"; /* RFC2616 Section 10.2.7 */
case 207:
return "Multi-Status"; /* RFC2518 Section 10.2, RFC4918 Section 11.1 */
case 208:
return "Already Reported"; /* RFC5842 Section 7.1 */
case 226:
return "IM used"; /* RFC3229 Section 10.4.1 */
/* RFC2616 Section 10.3 - Redirection 3xx */
case 300:
return "Multiple Choices"; /* RFC2616 Section 10.3.1 */
case 301:
return "Moved Permanently"; /* RFC2616 Section 10.3.2 */
case 302:
return "Found"; /* RFC2616 Section 10.3.3 */
case 303:
return "See Other"; /* RFC2616 Section 10.3.4 */
case 304:
return "Not Modified"; /* RFC2616 Section 10.3.5 */
case 305:
return "Use Proxy"; /* RFC2616 Section 10.3.6 */
case 307:
return "Temporary Redirect"; /* RFC2616 Section 10.3.8 */
case 308:
return "Permanent Redirect"; /* RFC7238 Section 3 */
/* RFC2616 Section 10.4 - Client Error 4xx */
case 400:
return "Bad Request"; /* RFC2616 Section 10.4.1 */
case 401:
return "Unauthorized"; /* RFC2616 Section 10.4.2 */
case 402:
return "Payment Required"; /* RFC2616 Section 10.4.3 */
case 403:
return "Forbidden"; /* RFC2616 Section 10.4.4 */
case 404:
return "Not Found"; /* RFC2616 Section 10.4.5 */
case 405:
return "Method Not Allowed"; /* RFC2616 Section 10.4.6 */
case 406:
return "Not Acceptable"; /* RFC2616 Section 10.4.7 */
case 407:
return "Proxy Authentication Required"; /* RFC2616 Section 10.4.8 */
case 408:
return "Request Time-out"; /* RFC2616 Section 10.4.9 */
case 409:
return "Conflict"; /* RFC2616 Section 10.4.10 */
case 410:
return "Gone"; /* RFC2616 Section 10.4.11 */
case 411:
return "Length Required"; /* RFC2616 Section 10.4.12 */
case 412:
return "Precondition Failed"; /* RFC2616 Section 10.4.13 */
case 413:
return "Request Entity Too Large"; /* RFC2616 Section 10.4.14 */
case 414:
return "Request-URI Too Large"; /* RFC2616 Section 10.4.15 */
case 415:
return "Unsupported Media Type"; /* RFC2616 Section 10.4.16 */
case 416:
return "Requested range not satisfiable"; /* RFC2616 Section 10.4.17 */
case 417:
return "Expectation Failed"; /* RFC2616 Section 10.4.18 */
case 421:
return "Misdirected Request"; /* RFC7540 Section 9.1.2 */
case 422:
return "Unproccessable entity"; /* RFC2518 Section 10.3, RFC4918
* Section 11.2 */
case 423:
return "Locked"; /* RFC2518 Section 10.4, RFC4918 Section 11.3 */
case 424:
return "Failed Dependency"; /* RFC2518 Section 10.5, RFC4918
* Section 11.4 */
case 426:
return "Upgrade Required"; /* RFC 2817 Section 4 */
case 428:
return "Precondition Required"; /* RFC 6585, Section 3 */
case 429:
return "Too Many Requests"; /* RFC 6585, Section 4 */
case 431:
return "Request Header Fields Too Large"; /* RFC 6585, Section 5 */
case 451:
return "Unavailable For Legal Reasons"; /* draft-tbray-http-legally-restricted-status-05,
* Section 3 */
/* RFC2616 Section 10.5 - Server Error 5xx */
case 500:
return "Internal Server Error"; /* RFC2616 Section 10.5.1 */
case 501:
return "Not Implemented"; /* RFC2616 Section 10.5.2 */
case 502:
return "Bad Gateway"; /* RFC2616 Section 10.5.3 */
case 503:
return "Service Unavailable"; /* RFC2616 Section 10.5.4 */
case 504:
return "Gateway Time-out"; /* RFC2616 Section 10.5.5 */
case 505:
return "HTTP Version not supported"; /* RFC2616 Section 10.5.6 */
case 506:
return "Variant Also Negotiates"; /* RFC 2295, Section 8.1 */
case 507:
return "Insufficient Storage"; /* RFC2518 Section 10.6, RFC4918
* Section 11.5 */
case 508:
return "Loop Detected"; /* RFC5842 Section 7.1 */
case 510:
return "Not Extended"; /* RFC 2774, Section 7 */
case 511:
return "Network Authentication Required"; /* RFC 6585, Section 6 */
/* Other status codes, not shown in the IANA HTTP status code assignment.
* E.g., "de facto" standards due to common use, ... */
case 418:
return "I am a teapot"; /* RFC2324 Section 2.3.2 */
case 419:
return "Authentication Timeout"; /* common use */
default:
/* This error code is unknown. This should not happen. */
if (conn) {
mg_cry(conn, "Unknown HTTP response code: %u", response_code);
}
/* Return at least a category according to RFC 2616 Section 10. */
if (response_code >= 100 && response_code < 200) {
/* Unknown informational status code */
return "Information";
}
if (response_code >= 200 && response_code < 300) {
/* Unknown success code */
return "Success";
}
if (response_code >= 300 && response_code < 400) {
/* Unknown redirection code */
return "Redirection";
}
if (response_code >= 400 && response_code < 500) {
/* Unknown request error code */
return "Client Error";
}
if (response_code >= 500 && response_code < 600) {
/* Unknown server error code */
return "Server Error";
}
/* Response code not even within reasonable range */
return "";
}
}
static void send_http_error(struct mg_connection *,
int,
PRINTF_FORMAT_STRING(const char *fmt),
...) PRINTF_ARGS(3, 4);
static void
send_http_error(struct mg_connection *conn, int status, const char *fmt, ...)
{
char buf[MG_BUF_LEN];
va_list ap;
int len, i, page_handler_found, scope, truncated;
char date[64];
time_t curtime = time(NULL);
const char *error_handler = NULL;
struct file error_page_file = STRUCT_FILE_INITIALIZER;
const char *error_page_file_ext, *tstr;
const char *status_text = mg_get_response_code_text(status, conn);
if (conn == NULL) {
return;
}
conn->status_code = status;
if (conn->in_error_handler || conn->ctx->callbacks.http_error == NULL
|| conn->ctx->callbacks.http_error(conn, status)) {
if (!conn->in_error_handler) {
/* Send user defined error pages, if defined */
error_handler = conn->ctx->config[ERROR_PAGES];
error_page_file_ext = conn->ctx->config[INDEX_FILES];
page_handler_found = 0;
if (error_handler != NULL) {
for (scope = 1; (scope <= 3) && !page_handler_found; scope++) {
switch (scope) {
case 1: /* Handler for specific error, e.g. 404 error */
mg_snprintf(conn,
&truncated,
buf,
sizeof(buf) - 32,
"%serror%03u.",
error_handler,
status);
break;
case 2: /* Handler for error group, e.g., 5xx error handler
* for all server errors (500-599) */
mg_snprintf(conn,
&truncated,
buf,
sizeof(buf) - 32,
"%serror%01uxx.",
error_handler,
status / 100);
break;
default: /* Handler for all errors */
mg_snprintf(conn,
&truncated,
buf,
sizeof(buf) - 32,
"%serror.",
error_handler);
break;
}
/* String truncation in buf may only occur if error_handler
* is too long. This string is from the config, not from a
* client. */
(void)truncated;
len = (int)strlen(buf);
tstr = strchr(error_page_file_ext, '.');
while (tstr) {
for (i = 1; i < 32 && tstr[i] != 0 && tstr[i] != ',';
i++)
buf[len + i - 1] = tstr[i];
buf[len + i - 1] = 0;
if (mg_stat(conn, buf, &error_page_file)) {
page_handler_found = 1;
break;
}
tstr = strchr(tstr + i, '.');
}
}
}
if (page_handler_found) {
conn->in_error_handler = 1;
handle_file_based_request(conn, buf, &error_page_file);
conn->in_error_handler = 0;
return;
}
}
/* No custom error page. Send default error page. */
gmt_time_string(date, sizeof(date), &curtime);
conn->must_close = 1;
mg_printf(conn, "HTTP/1.1 %d %s\r\n", status, status_text);
send_no_cache_header(conn);
mg_printf(conn,
"Date: %s\r\n"
"Connection: close\r\n\r\n",
date);
/* Errors 1xx, 204 and 304 MUST NOT send a body */
if (status > 199 && status != 204 && status != 304) {
mg_printf(conn, "Error %d: %s\n", status, status_text);
if (fmt != NULL) {
va_start(ap, fmt);
mg_vsnprintf(conn, NULL, buf, sizeof(buf), fmt, ap);
va_end(ap);
mg_write(conn, buf, strlen(buf));
DEBUG_TRACE("Error %i - [%s]", status, buf);
}
}
else {
/* No body allowed. Close the connection. */
DEBUG_TRACE("Error %i", status);
}
}
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
/* Create substitutes for POSIX functions in Win32. */
#if defined(__MINGW32__)
/* Show no warning in case system functions are not used. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
static int
pthread_mutex_init(pthread_mutex_t *mutex, void *unused)
{
(void)unused;
*mutex = CreateMutex(NULL, FALSE, NULL);
return *mutex == NULL ? -1 : 0;
}
static int
pthread_mutex_destroy(pthread_mutex_t *mutex)
{
return CloseHandle(*mutex) == 0 ? -1 : 0;
}
static int
pthread_mutex_lock(pthread_mutex_t *mutex)
{
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0 ? 0 : -1;
}
#ifdef ENABLE_UNUSED_PTHREAD_FUNCTIONS
static int
pthread_mutex_trylock(pthread_mutex_t *mutex)
{
switch (WaitForSingleObject(*mutex, 0)) {
case WAIT_OBJECT_0:
return 0;
case WAIT_TIMEOUT:
return -2; /* EBUSY */
}
return -1;
}
#endif
static int
pthread_mutex_unlock(pthread_mutex_t *mutex)
{
return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}
#ifndef WIN_PTHREADS_TIME_H
static int
clock_gettime(clockid_t clk_id, struct timespec *tp)
{
FILETIME ft;
ULARGE_INTEGER li;
BOOL ok = FALSE;
double d;
static double perfcnt_per_sec = 0.0;
if (tp) {
memset(tp, 0, sizeof(*tp));
if (clk_id == CLOCK_REALTIME) {
GetSystemTimeAsFileTime(&ft);
li.LowPart = ft.dwLowDateTime;
li.HighPart = ft.dwHighDateTime;
li.QuadPart -= 116444736000000000; /* 1.1.1970 in filedate */
tp->tv_sec = (time_t)(li.QuadPart / 10000000);
tp->tv_nsec = (long)(li.QuadPart % 10000000) * 100;
ok = TRUE;
}
else if (clk_id == CLOCK_MONOTONIC) {
if (perfcnt_per_sec == 0.0) {
QueryPerformanceFrequency((LARGE_INTEGER *)&li);
perfcnt_per_sec = 1.0 / li.QuadPart;
}
if (perfcnt_per_sec != 0.0) {
QueryPerformanceCounter((LARGE_INTEGER *)&li);
d = li.QuadPart * perfcnt_per_sec;
tp->tv_sec = (time_t)d;
d -= tp->tv_sec;
tp->tv_nsec = (long)(d * 1.0E9);
ok = TRUE;
}
}
}
return ok ? 0 : -1;
}
#endif
static int
pthread_cond_init(pthread_cond_t *cv, const void *unused)
{
(void)unused;
InitializeCriticalSection(&cv->threadIdSec);
cv->waitingthreadcount = 0;
cv->waitingthreadhdls =
(pthread_t *)mg_calloc(MAX_WORKER_THREADS, sizeof(pthread_t));
return (cv->waitingthreadhdls != NULL) ? 0 : -1;
}
static int
pthread_cond_timedwait(pthread_cond_t *cv,
pthread_mutex_t *mutex,
const struct timespec *abstime)
{
struct mg_workerTLS *tls =
(struct mg_workerTLS *)pthread_getspecific(sTlsKey);
int ok;
struct timespec tsnow;
int64_t nsnow, nswaitabs, nswaitrel;
DWORD mswaitrel;
EnterCriticalSection(&cv->threadIdSec);
assert(cv->waitingthreadcount < MAX_WORKER_THREADS);
cv->waitingthreadhdls[cv->waitingthreadcount] =
tls->pthread_cond_helper_mutex;
cv->waitingthreadcount++;
LeaveCriticalSection(&cv->threadIdSec);
if (abstime) {
clock_gettime(CLOCK_REALTIME, &tsnow);
nsnow = (((int64_t)tsnow.tv_sec) * 1000000000) + tsnow.tv_nsec;
nswaitabs =
(((int64_t)abstime->tv_sec) * 1000000000) + abstime->tv_nsec;
nswaitrel = nswaitabs - nsnow;
if (nswaitrel < 0) {
nswaitrel = 0;
}
mswaitrel = (DWORD)(nswaitrel / 1000000);
}
else {
mswaitrel = INFINITE;
}
pthread_mutex_unlock(mutex);
ok = (WAIT_OBJECT_0
== WaitForSingleObject(tls->pthread_cond_helper_mutex, mswaitrel));
pthread_mutex_lock(mutex);
return ok ? 0 : -1;
}
static int
pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex)
{
return pthread_cond_timedwait(cv, mutex, NULL);
}
static int
pthread_cond_signal(pthread_cond_t *cv)
{
int i;
HANDLE wkup = NULL;
BOOL ok = FALSE;
EnterCriticalSection(&cv->threadIdSec);
if (cv->waitingthreadcount) {
wkup = cv->waitingthreadhdls[0];
ok = SetEvent(wkup);
for (i = 1; i < cv->waitingthreadcount; i++) {
cv->waitingthreadhdls[i - 1] = cv->waitingthreadhdls[i];
}
cv->waitingthreadcount--;
assert(ok);
}
LeaveCriticalSection(&cv->threadIdSec);
return ok ? 0 : 1;
}
static int
pthread_cond_broadcast(pthread_cond_t *cv)
{
EnterCriticalSection(&cv->threadIdSec);
while (cv->waitingthreadcount) {
pthread_cond_signal(cv);
}
LeaveCriticalSection(&cv->threadIdSec);
return 0;
}
static int
pthread_cond_destroy(pthread_cond_t *cv)
{
EnterCriticalSection(&cv->threadIdSec);
assert(cv->waitingthreadcount == 0);
mg_free(cv->waitingthreadhdls);
cv->waitingthreadhdls = 0;
LeaveCriticalSection(&cv->threadIdSec);
DeleteCriticalSection(&cv->threadIdSec);
return 0;
}
#if defined(__MINGW32__)
/* Enable unused function warning again */
#pragma GCC diagnostic pop
#endif
/* For Windows, change all slashes to backslashes in path names. */
static void
change_slashes_to_backslashes(char *path)
{
int i;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == '/') {
path[i] = '\\';
}
/* remove double backslash (check i > 0 to preserve UNC paths,
* like \\server\file.txt) */
if ((path[i] == '\\') && (i > 0)) {
while (path[i + 1] == '\\' || path[i + 1] == '/') {
(void)memmove(path + i + 1, path + i + 2, strlen(path + i + 1));
}
}
}
}
/* Encode 'path' which is assumed UTF-8 string, into UNICODE string.
* wbuf and wbuf_len is a target buffer and its length. */
static void
to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len)
{
char buf[PATH_MAX], buf2[PATH_MAX];
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
/* Convert to Unicode and back. If doubly-converted string does not
* match the original, something is fishy, reject. */
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int)wbuf_len);
WideCharToMultiByte(
CP_UTF8, 0, wbuf, (int)wbuf_len, buf2, sizeof(buf2), NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
#if defined(_WIN32_WCE)
/* Create substitutes for POSIX functions in Win32. */
#if defined(__MINGW32__)
/* Show no warning in case system functions are not used. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
static time_t
time(time_t *ptime)
{
time_t t;
SYSTEMTIME st;
FILETIME ft;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
if (ptime != NULL) {
*ptime = t;
}
return t;
}
static struct tm *
localtime(const time_t *ptime, struct tm *ptm)
{
int64_t t = ((int64_t)*ptime) * RATE_DIFF + EPOCH_DIFF;
FILETIME ft, lft;
SYSTEMTIME st;
TIME_ZONE_INFORMATION tzinfo;
if (ptm == NULL) {
return NULL;
}
*(int64_t *)&ft = t;
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, &st);
ptm->tm_year = st.wYear - 1900;
ptm->tm_mon = st.wMonth - 1;
ptm->tm_wday = st.wDayOfWeek;
ptm->tm_mday = st.wDay;
ptm->tm_hour = st.wHour;
ptm->tm_min = st.wMinute;
ptm->tm_sec = st.wSecond;
ptm->tm_yday = 0; /* hope nobody uses this */
ptm->tm_isdst =
GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
return ptm;
}
static struct tm *
gmtime(const time_t *ptime, struct tm *ptm)
{
/* FIXME(lsm): fix this. */
return localtime(ptime, ptm);
}
static size_t
strftime(char *dst, size_t dst_size, const char *fmt, const struct tm *tm)
{
(void)mg_snprintf(NULL, dst, dst_size, "implement strftime() for WinCE");
return 0;
}
#if defined(__MINGW32__)
/* Enable unused function warning again */
#pragma GCC diagnostic pop
#endif
#endif
/* Windows happily opens files with some garbage at the end of file name.
* For example, fopen("a.cgi ", "r") on Windows successfully opens
* "a.cgi", despite one would expect an error back.
* This function returns non-0 if path ends with some garbage. */
static int
path_cannot_disclose_cgi(const char *path)
{
static const char *allowed_last_characters = "_-";
int last = path[strlen(path) - 1];
return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
}
static int
mg_stat(struct mg_connection *conn, const char *path, struct file *filep)
{
wchar_t wbuf[PATH_MAX];
WIN32_FILE_ATTRIBUTE_DATA info;
time_t creation_time;
if (!filep) {
return 0;
}
memset(filep, 0, sizeof(*filep));
if (conn && is_file_in_memory(conn, path, filep)) {
/* filep->is_directory = 0; filep->gzipped = 0; .. already done by
* memset */
filep->last_modified = time(NULL);
/* last_modified = now ... assumes the file may change during runtime,
* so every mg_fopen call may return different data */
/* last_modified = conn->ctx.start_time;
* May be used it the data does not change during runtime. This allows
* browser caching. Since we do not know, we have to assume the file
* in memory may change. */
return 1;
}
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
filep->last_modified =
SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
info.ftLastWriteTime.dwHighDateTime);
/* On Windows, the file creation time can be higher than the
* modification time, e.g. when a file is copied.
* Since the Last-Modified timestamp is used for caching
* it should be based on the most recent timestamp. */
creation_time = SYS2UNIX_TIME(info.ftCreationTime.dwLowDateTime,
info.ftCreationTime.dwHighDateTime);
if (creation_time > filep->last_modified) {
filep->last_modified = creation_time;
}
filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
/* If file name is fishy, reset the file structure and return
* error.
* Note it is important to reset, not just return the error, cause
* functions like is_file_opened() check the struct. */
if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
memset(filep, 0, sizeof(*filep));
return 0;
}
return 1;
}
return 0;
}
static int
mg_remove(const char *path)
{
wchar_t wbuf[PATH_MAX];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
return DeleteFileW(wbuf) ? 0 : -1;
}
static int
mg_mkdir(const char *path, int mode)
{
char buf[PATH_MAX];
wchar_t wbuf[PATH_MAX];
(void)mode;
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
(void)MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
}
/* Create substitutes for POSIX functions in Win32. */
#if defined(__MINGW32__)
/* Show no warning in case system functions are not used. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
/* Implementation of POSIX opendir/closedir/readdir for Windows. */
static DIR *
opendir(const char *name)
{
DIR *dir = NULL;
wchar_t wpath[PATH_MAX];
DWORD attrs;
if (name == NULL) {
SetLastError(ERROR_BAD_ARGUMENTS);
}
else if ((dir = (DIR *)mg_malloc(sizeof(*dir))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
}
else {
to_unicode(name, wpath, ARRAY_SIZE(wpath));
attrs = GetFileAttributesW(wpath);
if (attrs != 0xFFFFFFFF && ((attrs & FILE_ATTRIBUTE_DIRECTORY)
== FILE_ATTRIBUTE_DIRECTORY)) {
(void)wcscat(wpath, L"\\*");
dir->handle = FindFirstFileW(wpath, &dir->info);
dir->result.d_name[0] = '\0';
}
else {
mg_free(dir);
dir = NULL;
}
}
return dir;
}
static int
closedir(DIR *dir)
{
int result = 0;
if (dir != NULL) {
if (dir->handle != INVALID_HANDLE_VALUE)
result = FindClose(dir->handle) ? 0 : -1;
mg_free(dir);
}
else {
result = -1;
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
static struct dirent *
readdir(DIR *dir)
{
struct dirent *result = 0;
if (dir) {
if (dir->handle != INVALID_HANDLE_VALUE) {
result = &dir->result;
(void)WideCharToMultiByte(CP_UTF8,
0,
dir->info.cFileName,
-1,
result->d_name,
sizeof(result->d_name),
NULL,
NULL);
if (!FindNextFileW(dir->handle, &dir->info)) {
(void)FindClose(dir->handle);
dir->handle = INVALID_HANDLE_VALUE;
}
}
else {
SetLastError(ERROR_FILE_NOT_FOUND);
}
}
else {
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
#ifndef HAVE_POLL
static int
poll(struct pollfd *pfd, unsigned int n, int milliseconds)
{
struct timeval tv;
fd_set set;
unsigned int i;
int result;
SOCKET maxfd = 0;
memset(&tv, 0, sizeof(tv));
tv.tv_sec = milliseconds / 1000;
tv.tv_usec = (milliseconds % 1000) * 1000;
FD_ZERO(&set);
for (i = 0; i < n; i++) {
FD_SET((SOCKET)pfd[i].fd, &set);
pfd[i].revents = 0;
if (pfd[i].fd > maxfd) {
maxfd = pfd[i].fd;
}
}
if ((result = select((int)maxfd + 1, &set, NULL, NULL, &tv)) > 0) {
for (i = 0; i < n; i++) {
if (FD_ISSET(pfd[i].fd, &set)) {
pfd[i].revents = POLLIN;
}
}
}
return result;
}
#endif /* HAVE_POLL */
#if defined(__MINGW32__)
/* Enable unused function warning again */
#pragma GCC diagnostic pop
#endif
static void
set_close_on_exec(SOCKET sock, struct mg_connection *conn /* may be null */)
{
(void)conn; /* Unused. */
(void)SetHandleInformation((HANDLE)(intptr_t)sock, HANDLE_FLAG_INHERIT, 0);
}
int
mg_start_thread(mg_thread_func_t f, void *p)
{
#if defined(USE_STACK_SIZE) && (USE_STACK_SIZE > 1)
/* Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384
*/
return ((_beginthread((void(__cdecl *)(void *))f, USE_STACK_SIZE, p)
== ((uintptr_t)(-1L)))
? -1
: 0);
#else
return (
(_beginthread((void(__cdecl *)(void *))f, 0, p) == ((uintptr_t)(-1L)))
? -1
: 0);
#endif /* defined(USE_STACK_SIZE) && (USE_STACK_SIZE > 1) */
}
/* Start a thread storing the thread context. */
static int
mg_start_thread_with_id(unsigned(__stdcall *f)(void *),
void *p,
pthread_t *threadidptr)
{
uintptr_t uip;
HANDLE threadhandle;
int result = -1;
uip = _beginthreadex(NULL, 0, (unsigned(__stdcall *)(void *))f, p, 0, NULL);
threadhandle = (HANDLE)uip;
if ((uip != (uintptr_t)(-1L)) && (threadidptr != NULL)) {
*threadidptr = threadhandle;
result = 0;
}
return result;
}
/* Wait for a thread to finish. */
static int
mg_join_thread(pthread_t threadid)
{
int result;
DWORD dwevent;
result = -1;
dwevent = WaitForSingleObject(threadid, INFINITE);
if (dwevent == WAIT_FAILED) {
DEBUG_TRACE("WaitForSingleObject() failed, error %d", ERRNO);
}
else {
if (dwevent == WAIT_OBJECT_0) {
CloseHandle(threadid);
result = 0;
}
}
return result;
}
#if !defined(NO_SSL_DL)
/* Create substitutes for POSIX functions in Win32. */
#if defined(__MINGW32__)
/* Show no warning in case system functions are not used. */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
static HANDLE
dlopen(const char *dll_name, int flags)
{
wchar_t wbuf[PATH_MAX];
(void)flags;
to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
return LoadLibraryW(wbuf);
}
static int
dlclose(void *handle)
{
int result;
if (FreeLibrary((HMODULE)handle) != 0) {
result = 0;
}
else {
result = -1;
}
return result;
}
#if defined(__MINGW32__)
/* Enable unused function warning again */
#pragma GCC diagnostic pop
#endif
#endif
#if !defined(NO_CGI)
#define SIGKILL (0)
static int
kill(pid_t pid, int sig_num)
{
(void)TerminateProcess((HANDLE)pid, (UINT)sig_num);
(void)CloseHandle((HANDLE)pid);
return 0;
}
static void
trim_trailing_whitespaces(char *s)
{
char *e = s + strlen(s) - 1;
while (e > s && isspace(*(unsigned char *)e)) {
*e-- = '\0';
}
}
static pid_t
spawn_process(struct mg_connection *conn,
const char *prog,
char *envblk,
char *envp[],
int fdin,
int fdout,
int fderr,
const char *dir)
{
HANDLE me;
char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
cmdline[PATH_MAX], buf[PATH_MAX];
int truncated;
struct file file = STRUCT_FILE_INITIALIZER;
STARTUPINFOA si;
PROCESS_INFORMATION pi = { 0 };
(void)envp;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
me = GetCurrentProcess();
DuplicateHandle(me,
(HANDLE)_get_osfhandle(fdin),
me,
&si.hStdInput,
0,
TRUE,
DUPLICATE_SAME_ACCESS);
DuplicateHandle(me,
(HANDLE)_get_osfhandle(fdout),
me,
&si.hStdOutput,
0,
TRUE,
DUPLICATE_SAME_ACCESS);
DuplicateHandle(me,
(HANDLE)_get_osfhandle(fderr),
me,
&si.hStdError,
0,
TRUE,
DUPLICATE_SAME_ACCESS);
/* If CGI file is a script, try to read the interpreter line */
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
buf[0] = buf[1] = '\0';
/* Read the first line of the script into the buffer */
mg_snprintf(
conn, &truncated, cmdline, sizeof(cmdline), "%s/%s", dir, prog);
if (truncated) {
pi.hProcess = (pid_t)-1;
goto spawn_cleanup;
}
if (mg_fopen(conn, cmdline, "r", &file)) {
p = (char *)file.membuf;
mg_fgets(buf, sizeof(buf), &file, &p);
mg_fclose(&file);
buf[sizeof(buf) - 1] = '\0';
}
if (buf[0] == '#' && buf[1] == '!') {
trim_trailing_whitespaces(buf + 2);
}
else {
buf[2] = '\0';
}
interp = buf + 2;
}
if (interp[0] != '\0') {
GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
interp = full_interp;
}
GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
if (interp[0] != '\0') {
mg_snprintf(conn,
&truncated,
cmdline,
sizeof(cmdline),
"\"%s\" \"%s\\%s\"",
interp,
full_dir,
prog);
}
else {
mg_snprintf(conn,
&truncated,
cmdline,
sizeof(cmdline),
"\"%s\\%s\"",
full_dir,
prog);
}
if (truncated) {
pi.hProcess = (pid_t)-1;
goto spawn_cleanup;
}
DEBUG_TRACE("Running [%s]", cmdline);
if (CreateProcessA(NULL,
cmdline,
NULL,
NULL,
TRUE,
CREATE_NEW_PROCESS_GROUP,
envblk,
NULL,
&si,
&pi) == 0) {
mg_cry(
conn, "%s: CreateProcess(%s): %ld", __func__, cmdline, (long)ERRNO);
pi.hProcess = (pid_t)-1;
/* goto spawn_cleanup; */
}
spawn_cleanup:
(void)CloseHandle(si.hStdOutput);
(void)CloseHandle(si.hStdError);
(void)CloseHandle(si.hStdInput);
if (pi.hThread != NULL) {
(void)CloseHandle(pi.hThread);
}
return (pid_t)pi.hProcess;
}
#endif /* !NO_CGI */
static int
set_non_blocking_mode(SOCKET sock)
{
unsigned long on = 1;
return ioctlsocket(sock, (long)FIONBIO, &on);
}
#else
static int
mg_stat(struct mg_connection *conn, const char *path, struct file *filep)
{
struct stat st;
if (!filep) {
return 0;
}
memset(filep, 0, sizeof(*filep));
if (conn && is_file_in_memory(conn, path, filep)) {
return 1;
}
if (0 == stat(path, &st)) {
filep->size = (uint64_t)(st.st_size);
filep->last_modified = st.st_mtime;
filep->is_directory = S_ISDIR(st.st_mode);
return 1;
}
return 0;
}
static void
set_close_on_exec(SOCKET fd, struct mg_connection *conn /* may be null */)
{
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) {
if (conn) {
mg_cry(conn,
"%s: fcntl(F_SETFD FD_CLOEXEC) failed: %s",
__func__,
strerror(ERRNO));
}
}
}
int
mg_start_thread(mg_thread_func_t func, void *param)
{
pthread_t thread_id;
pthread_attr_t attr;
int result;
(void)pthread_attr_init(&attr);
(void)pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#if defined(USE_STACK_SIZE) && (USE_STACK_SIZE > 1)
/* Compile-time option to control stack size,
* e.g. -DUSE_STACK_SIZE=16384 */
(void)pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
#endif /* defined(USE_STACK_SIZE) && (USE_STACK_SIZE > 1) */
result = pthread_create(&thread_id, &attr, func, param);
pthread_attr_destroy(&attr);
return result;
}
/* Start a thread storing the thread context. */
static int
mg_start_thread_with_id(mg_thread_func_t func,
void *param,
pthread_t *threadidptr)
{
pthread_t thread_id;
pthread_attr_t attr;
int result;
(void)pthread_attr_init(&attr);
#if defined(USE_STACK_SIZE) && (USE_STACK_SIZE > 1)
/* Compile-time option to control stack size,
* e.g. -DUSE_STACK_SIZE=16384 */
(void)pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
#endif /* defined(USE_STACK_SIZE) && USE_STACK_SIZE > 1 */
result = pthread_create(&thread_id, &attr, func, param);
pthread_attr_destroy(&attr);
if ((result == 0) && (threadidptr != NULL)) {
*threadidptr = thread_id;
}
return result;
}
/* Wait for a thread to finish. */
static int
mg_join_thread(pthread_t threadid)
{
int result;
result = pthread_join(threadid, NULL);
return result;
}
#ifndef NO_CGI
static pid_t
spawn_process(struct mg_connection *conn,
const char *prog,
char *envblk,
char *envp[],
int fdin,
int fdout,
int fderr,
const char *dir)
{
pid_t pid;
const char *interp;
(void)envblk;
if (conn == NULL) {
return 0;
}
if ((pid = fork()) == -1) {
/* Parent */
send_http_error(conn,
500,
"Error: Creating CGI process\nfork(): %s",
strerror(ERRNO));
}
else if (pid == 0) {
/* Child */
if (chdir(dir) != 0) {
mg_cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
}
else if (dup2(fdin, 0) == -1) {
mg_cry(
conn, "%s: dup2(%d, 0): %s", __func__, fdin, strerror(ERRNO));
}
else if (dup2(fdout, 1) == -1) {
mg_cry(
conn, "%s: dup2(%d, 1): %s", __func__, fdout, strerror(ERRNO));
}
else if (dup2(fderr, 2) == -1) {
mg_cry(
conn, "%s: dup2(%d, 2): %s", __func__, fderr, strerror(ERRNO));
}
else {
/* Keep stderr and stdout in two different pipes.
* Stdout will be sent back to the client,
* stderr should go into a server error log. */
(void)close(fdin);
(void)close(fdout);
(void)close(fderr);
/* After exec, all signal handlers are restored to their default
* values, with one exception of SIGCHLD. According to
* POSIX.1-2001 and Linux's implementation, SIGCHLD's handler will
* leave unchanged after exec if it was set to be ignored. Restore
* it to default action. */
signal(SIGCHLD, SIG_DFL);
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
(void)execle(prog, prog, NULL, envp);
mg_cry(conn,
"%s: execle(%s): %s",
__func__,
prog,
strerror(ERRNO));
}
else {
(void)execle(interp, interp, prog, NULL, envp);
mg_cry(conn,
"%s: execle(%s %s): %s",
__func__,
interp,
prog,
strerror(ERRNO));
}
}
exit(EXIT_FAILURE);
}
return pid;
}
#endif /* !NO_CGI */
static int
set_non_blocking_mode(SOCKET sock)
{
int flags;
flags = fcntl(sock, F_GETFL, 0);
(void)fcntl(sock, F_SETFL, flags | O_NONBLOCK);
return 0;
}
#endif /* _WIN32 */
/* End of initial operating system specific define block. */
/* Get a random number (independent of C rand function) */
static uint64_t
get_random(void)
{
static uint64_t lfsr = 0; /* Linear feedback shift register */
static uint64_t lcg = 0; /* Linear congruential generator */
struct timespec now;
memset(&now, 0, sizeof(now));
clock_gettime(CLOCK_MONOTONIC, &now);
if (lfsr == 0) {
/* lfsr will be only 0 if has not been initialized,
* so this code is called only once. */
lfsr = (((uint64_t)now.tv_sec) << 21) ^ ((uint64_t)now.tv_nsec)
^ ((uint64_t)(ptrdiff_t)&now) ^ ((uint64_t)pthread_self())
^ (((uint64_t)time(NULL)) << 33);
lcg = (((uint64_t)now.tv_sec) << 25) + (uint64_t)now.tv_nsec
+ (uint64_t)(ptrdiff_t)&now;
}
else {
/* Get the next step of both random number generators. */
lfsr = (lfsr >> 1)
| ((((lfsr >> 0) ^ (lfsr >> 1) ^ (lfsr >> 3) ^ (lfsr >> 4)) & 1)
<< 63);
lcg = lcg * 6364136223846793005 + 1442695040888963407;
}
/* Combining two pseudo-random number generators and a high resolution part
* of the current server time will make it hard (impossible?) to guess the
* next number. */
return (lfsr ^ lcg ^ (uint64_t)now.tv_nsec);
}
/* Write data to the IO channel - opened file descriptor, socket or SSL
* descriptor. Return number of bytes written. */
static int
push(struct mg_context *ctx,
FILE *fp,
SOCKET sock,
SSL *ssl,
const char *buf,
int len,
double timeout)
{
struct timespec start, now;
int n, err;
#ifdef _WIN32
typedef int len_t;
#else
typedef size_t len_t;
#endif
if (timeout > 0) {
memset(&start, 0, sizeof(start));
memset(&now, 0, sizeof(now));
clock_gettime(CLOCK_MONOTONIC, &start);
}
if (ctx == NULL) {
return -1;
}
#ifdef NO_SSL
if (ssl) {
return -1;
}
#endif
do {
#ifndef NO_SSL
if (ssl != NULL) {
n = SSL_write(ssl, buf, len);
if (n <= 0) {
err = SSL_get_error(ssl, n);
if ((err == 5 /* SSL_ERROR_SYSCALL */) && (n == -1)) {
err = ERRNO;
}
else {
DEBUG_TRACE("SSL_write() failed, error %d", err);
return -1;
}
}
else {
err = 0;
}
}
else
#endif
if (fp != NULL) {
n = (int)fwrite(buf, 1, (size_t)len, fp);
if (ferror(fp)) {
n = -1;
err = ERRNO;
}
else {
err = 0;
}
}
else {
n = (int)send(sock, buf, (len_t)len, MSG_NOSIGNAL);
err = (n < 0) ? ERRNO : 0;
}
if (ctx->stop_flag) {
return -1;
}
if ((n > 0) || (n == 0 && len == 0)) {
/* some data has been read, or no data was requested */
return n;
}
if (n == 0) {
/* shutdown of the socket at client side */
return -1;
}
if (n < 0) {
/* socket error - check errno */
DEBUG_TRACE("send() failed, error %d", err);
/* TODO: error handling depending on the error code.
* These codes are different between Windows and Linux.
*/
return -1;
}
/* This code is not reached in the moment.
* ==> Fix the TODOs above first. */
if (timeout > 0) {
clock_gettime(CLOCK_MONOTONIC, &now);
}
} while ((timeout <= 0) || (mg_difftimespec(&now, &start) <= timeout));
(void)err; /* Avoid unused warning if NO_SSL is set and DEBUG_TRACE is not
used */
return -1;
}
static int64_t
push_all(struct mg_context *ctx,
FILE *fp,
SOCKET sock,
SSL *ssl,
const char *buf,
int64_t len)
{
double timeout = -1.0;
int64_t n, nwritten = 0;
if (ctx == NULL) {
return -1;
}
if (ctx->config[REQUEST_TIMEOUT]) {
timeout = atoi(ctx->config[REQUEST_TIMEOUT]) / 1000.0;
}
while (len > 0 && ctx->stop_flag == 0) {
n = push(ctx, fp, sock, ssl, buf + nwritten, (int)len, timeout);
if (n < 0) {
if (nwritten == 0) {
nwritten = n; /* Propagate the error */
}
break;
}
else if (n == 0) {
break; /* No more data to write */
}
else {
nwritten += n;
len -= n;
}
}
return nwritten;
}
/* Read from IO channel - opened file descriptor, socket, or SSL descriptor.
* Return negative value on error, or number of bytes read on success. */
static int
pull(FILE *fp, struct mg_connection *conn, char *buf, int len, double timeout)
{
int nread, err;
struct timespec start, now;
#ifdef _WIN32
typedef int len_t;
#else
typedef size_t len_t;
#endif
if (timeout > 0) {
memset(&start, 0, sizeof(start));
memset(&now, 0, sizeof(now));
clock_gettime(CLOCK_MONOTONIC, &start);
}
do {
if (fp != NULL) {
/* Use read() instead of fread(), because if we're reading from the
* CGI pipe, fread() may block until IO buffer is filled up. We
* cannot afford to block and must pass all read bytes immediately
* to the client. */
nread = (int)read(fileno(fp), buf, (size_t)len);
err = (nread < 0) ? ERRNO : 0;
#ifndef NO_SSL
}
else if (conn->ssl != NULL) {
nread = SSL_read(conn->ssl, buf, len);
if (nread <= 0) {
err = SSL_get_error(conn->ssl, nread);
if ((err == 5 /* SSL_ERROR_SYSCALL */) && (nread == -1)) {
err = ERRNO;
}
else {
DEBUG_TRACE("SSL_read() failed, error %d", err);
return -1;
}
}
else {
err = 0;
}
#endif
}
else {
nread = (int)recv(conn->client.sock, buf, (len_t)len, 0);
err = (nread < 0) ? ERRNO : 0;
}
if (conn->ctx->stop_flag) {
return -1;
}
if ((nread > 0) || (nread == 0 && len == 0)) {
/* some data has been read, or no data was requested */
return nread;
}
if (nread == 0) {
/* shutdown of the socket at client side */
return -1;
}
if (nread < 0) {
/* socket error - check errno */
#ifdef _WIN32
if (err == WSAEWOULDBLOCK) {
/* standard case if called from close_socket_gracefully */
return -1;
}
else if (err == WSAETIMEDOUT) {
/* timeout is handled by the while loop */
}
else {
DEBUG_TRACE("recv() failed, error %d", err);
return -1;
}
#else
/* TODO: POSIX returns either EAGAIN or EWOULDBLOCK in both cases,
* if the timeout is reached and if the socket was set to non-
* blocking in close_socket_gracefully, so we can not distinguish
* here. We have to wait for the timeout in both cases for now.
*/
if (err == EAGAIN || err == EWOULDBLOCK) {
/* standard case if called from close_socket_gracefully
* => should return -1 */
/* or timeout occured
* => the code must stay in the while loop */
}
else {
DEBUG_TRACE("recv() failed, error %d", err);
return -1;
}
#endif
}
if (timeout > 0) {
clock_gettime(CLOCK_MONOTONIC, &now);
}
} while ((timeout <= 0) || (mg_difftimespec(&now, &start) <= timeout));
/* Timeout occured, but no data available. */
return -1;
}
static int
pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len)
{
int n, nread = 0;
double timeout = -1.0;
if (conn->ctx->config[REQUEST_TIMEOUT]) {
timeout = atoi(conn->ctx->config[REQUEST_TIMEOUT]) / 1000.0;
}
while (len > 0 && conn->ctx->stop_flag == 0) {
n = pull(fp, conn, buf + nread, len, timeout);
if (n < 0) {
if (nread == 0) {
nread = n; /* Propagate the error */
}
break;
}
else if (n == 0) {
break; /* No more data to read */
}
else {
conn->consumed_content += n;
nread += n;
len -= n;
}
}
return nread;
}
static void
discard_unread_request_data(struct mg_connection *conn)
{
char buf[MG_BUF_LEN];
size_t to_read;
int nread;
if (conn == NULL) {
return;
}
to_read = sizeof(buf);
if (conn->is_chunked) {
/* Chunked encoding: 1=chunk not read completely, 2=chunk read
* completely */
while (conn->is_chunked == 1) {
nread = mg_read(conn, buf, to_read);
if (nread <= 0) {
break;
}
}
}
else {
/* Not chunked: content length is known */
while (conn->consumed_content < conn->content_len) {
if (to_read
>(size_t)(conn->content_len - conn->consumed_content)) {
to_read = (size_t)(conn->content_len - conn->consumed_content);
}
nread = mg_read(conn, buf, to_read);
if (nread <= 0) {
break;
}
}
}
}
static int
mg_read_inner(struct mg_connection *conn, void *buf, size_t len)
{
int64_t n, buffered_len, nread;
int64_t len64 =
(int64_t)(len > INT_MAX ? INT_MAX : len); /* since the return value is
* int, we may not read more
* bytes */
const char *body;
if (conn == NULL) {
return 0;
}
/* If Content-Length is not set for a PUT or POST request, read until
* socket is closed */
if (conn->consumed_content == 0 && conn->content_len == -1) {
conn->content_len = INT64_MAX;
conn->must_close = 1;
}
nread = 0;
if (conn->consumed_content < conn->content_len) {
/* Adjust number of bytes to read. */
int64_t left_to_read = conn->content_len - conn->consumed_content;
if (left_to_read < len64) {
/* Do not read more than the total content length of the request.
*/
len64 = left_to_read;
}
/* Return buffered data */
buffered_len = (int64_t)(conn->data_len) - (int64_t)conn->request_len
- conn->consumed_content;
if (buffered_len > 0) {
if (len64 < buffered_len) {
buffered_len = len64;
}
body = conn->buf + conn->request_len + conn->consumed_content;
memcpy(buf, body, (size_t)buffered_len);
len64 -= buffered_len;
conn->consumed_content += buffered_len;
nread += buffered_len;
buf = (char *)buf + buffered_len;
}
/* We have returned all buffered data. Read new data from the remote
* socket.
*/
if ((n = pull_all(NULL, conn, (char *)buf, (int)len64)) >= 0) {
nread += n;
}
else {
nread = (nread > 0 ? nread : n);
}
}
return (int)nread;
}
static char
mg_getc(struct mg_connection *conn)
{
char c;
if (conn == NULL) {
return 0;
}
conn->content_len++;
if (mg_read_inner(conn, &c, 1) <= 0) {
return (char)0;
}
return c;
}
int
mg_read(struct mg_connection *conn, void *buf, size_t len)
{
if (len > INT_MAX) {
len = INT_MAX;
}
if (conn == NULL) {
return 0;
}
if (conn->is_chunked) {
size_t all_read = 0;
while (len > 0) {
if (conn->chunk_remainder) {
/* copy from the remainder of the last received chunk */
long read_ret;
size_t read_now =
((conn->chunk_remainder > len) ? (len)
: (conn->chunk_remainder));
conn->content_len += (int)read_now;
read_ret =
mg_read_inner(conn, (char *)buf + all_read, read_now);
all_read += (size_t)read_ret;
conn->chunk_remainder -= read_now;
len -= read_now;
if (conn->chunk_remainder == 0) {
/* the rest of the data in the current chunk has been read
*/
if ((mg_getc(conn) != '\r') || (mg_getc(conn) != '\n')) {
/* Protocol violation */
return -1;
}
}
}
else {
/* fetch a new chunk */
int i = 0;
char lenbuf[64];
char *end = 0;
unsigned long chunkSize = 0;
for (i = 0; i < ((int)sizeof(lenbuf) - 1); i++) {
lenbuf[i] = mg_getc(conn);
if (i > 0 && lenbuf[i] == '\r' && lenbuf[i - 1] != '\r') {
continue;
}
if (i > 1 && lenbuf[i] == '\n' && lenbuf[i - 1] == '\r') {
lenbuf[i + 1] = 0;
chunkSize = strtoul(lenbuf, &end, 16);
break;
}
if (!isalnum(lenbuf[i])) {
/* illegal character for chunk length */
return -1;
}
}
if ((end == NULL) || (*end != '\r')) {
/* chunksize not set correctly */
return -1;
}
conn->chunk_remainder = chunkSize;
if (chunkSize == 0) {
/* regular end of content */
conn->is_chunked = 2;
break;
}
}
}
return (int)all_read;
}
return mg_read_inner(conn, buf, len);
}
int
mg_write(struct mg_connection *conn, const void *buf, size_t len)
{
time_t now;
int64_t n, total, allowed;
if (conn == NULL) {
return 0;
}
if (conn->throttle > 0) {
if ((now = time(NULL)) != conn->last_throttle_time) {
conn->last_throttle_time = now;
conn->last_throttle_bytes = 0;
}
allowed = conn->throttle - conn->last_throttle_bytes;
if (allowed > (int64_t)len) {
allowed = (int64_t)len;
}
if ((total = push_all(conn->ctx,
NULL,
conn->client.sock,
conn->ssl,
(const char *)buf,
(int64_t)allowed)) == allowed) {
buf = (char *)buf + total;
conn->last_throttle_bytes += total;
while (total < (int64_t)len && conn->ctx->stop_flag == 0) {
allowed = conn->throttle >(int64_t)len - total
? (int64_t)len - total
: conn->throttle;
if ((n = push_all(conn->ctx,
NULL,
conn->client.sock,
conn->ssl,
(const char *)buf,
(int64_t)allowed)) != allowed) {
break;
}
sleep(1);
conn->last_throttle_bytes = allowed;
conn->last_throttle_time = time(NULL);
buf = (char *)buf + n;
total += n;
}
}
}
else {
total = push_all(conn->ctx,
NULL,
conn->client.sock,
conn->ssl,
(const char *)buf,
(int64_t)len);
}
return (int)total;
}
/* Alternative alloc_vprintf() for non-compliant C runtimes */
static int
alloc_vprintf2(char **buf, const char *fmt, va_list ap)
{
va_list ap_copy;
size_t size = MG_BUF_LEN;
int len = -1;
*buf = NULL;
while (len < 0) {
if (*buf) {
mg_free(*buf);
}
*buf = (char *)mg_malloc(size *= 4);
if (!*buf) {
break;
}
va_copy(ap_copy, ap);
len = vsnprintf_impl(*buf, size - 1, fmt, ap_copy);
va_end(ap_copy);
*buf[size - 1] = 0;
}
return len;
}
/* Print message to buffer. If buffer is large enough to hold the message,
* return buffer. If buffer is to small, allocate large enough buffer on heap,
* and return allocated buffer. */
static int
alloc_vprintf(char **out_buf,
char *prealloc_buf,
size_t prealloc_size,
const char *fmt,
va_list ap)
{
va_list ap_copy;
int len;
/* Windows is not standard-compliant, and vsnprintf() returns -1 if
* buffer is too small. Also, older versions of msvcrt.dll do not have
* _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
* Therefore, we make two passes: on first pass, get required message
* length.
* On second pass, actually print the message. */
va_copy(ap_copy, ap);
len = vsnprintf_impl(NULL, 0, fmt, ap_copy);
va_end(ap_copy);
if (len < 0) {
/* C runtime is not standard compliant, vsnprintf() returned -1.
* Switch to alternative code path that uses incremental allocations.
*/
va_copy(ap_copy, ap);
len = alloc_vprintf2(out_buf, fmt, ap);
va_end(ap_copy);
}
else if ((size_t)(len) >= prealloc_size) {
/* The pre-allocated buffer not large enough. */
/* Allocate a new buffer. */
*out_buf = (char *)mg_malloc((size_t)(len)+1);
if (!*out_buf) {
/* Allocation failed. Return -1 as "out of memory" error. */
return -1;
}
/* Buffer allocation successful. Store the string there. */
va_copy(ap_copy, ap);
IGNORE_UNUSED_RESULT(
vsnprintf_impl(*out_buf, (size_t)(len)+1, fmt, ap_copy));
va_end(ap_copy);
}
else {
/* The pre-allocated buffer is large enough.
* Use it to store the string and return the address. */
va_copy(ap_copy, ap);
IGNORE_UNUSED_RESULT(
vsnprintf_impl(prealloc_buf, prealloc_size, fmt, ap_copy));
va_end(ap_copy);
*out_buf = prealloc_buf;
}
return len;
}
static int
mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap)
{
char mem[MG_BUF_LEN];
char *buf = NULL;
int len;
if ((len = alloc_vprintf(&buf, mem, sizeof(mem), fmt, ap)) > 0) {
len = mg_write(conn, buf, (size_t)len);
}
if (buf != mem && buf != NULL) {
mg_free(buf);
}
return len;
}
int
mg_printf(struct mg_connection *conn, const char *fmt, ...)
{
va_list ap;
int result;
va_start(ap, fmt);
result = mg_vprintf(conn, fmt, ap);
va_end(ap);
return result;
}
int
mg_url_decode(const char *src,
int src_len,
char *dst,
int dst_len,
int is_form_url_encoded)
{
int i, j, a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (i < src_len - 2 && src[i] == '%'
&& isxdigit(*(const unsigned char *)(src + i + 1))
&& isxdigit(*(const unsigned char *)(src + i + 2))) {
a = tolower(*(const unsigned char *)(src + i + 1));
b = tolower(*(const unsigned char *)(src + i + 2));
dst[j] = (char)((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
}
else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
}
else {
dst[j] = src[i];
}
}
dst[j] = '\0'; /* Null-terminate the destination */
return i >= src_len ? j : -1;
}
int
mg_get_var(const char *data,
size_t data_len,
const char *name,
char *dst,
size_t dst_len)
{
return mg_get_var2(data, data_len, name, dst, dst_len, 0);
}
int
mg_get_var2(const char *data,
size_t data_len,
const char *name,
char *dst,
size_t dst_len,
size_t occurrence)
{
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
}
else if (data == NULL || name == NULL || data_len == 0) {
len = -1;
dst[0] = '\0';
}
else {
name_len = strlen(name);
e = data + data_len;
len = -1;
dst[0] = '\0';
/* data is "var1=val1&var2=val2...". Find variable first */
for (p = data; p + name_len < e; p++) {
if ((p == data || p[-1] == '&') && p[name_len] == '='
&& !mg_strncasecmp(name, p, name_len) && 0 == occurrence--) {
/* Point p to variable value */
p += name_len + 1;
/* Point s to the end of the value */
s = (const char *)memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
/* assert(s >= p); */
if (s < p) {
return -3;
}
/* Decode variable into destination buffer */
len = mg_url_decode(p, (int)(s - p), dst, (int)dst_len, 1);
/* Redirect error code from -1 to -2 (destination buffer too
* small). */
if (len == -1) {
len = -2;
}
break;
}
}
}
return len;
}
int
mg_get_cookie(const char *cookie_header,
const char *var_name,
char *dst,
size_t dst_size)
{
const char *s, *p, *end;
int name_len, len = -1;
if (dst == NULL || dst_size == 0) {
len = -2;
}
else if (var_name == NULL || (s = cookie_header) == NULL) {
len = -1;
dst[0] = '\0';
}
else {
name_len = (int)strlen(var_name);
end = s + strlen(s);
dst[0] = '\0';
for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL) {
p = end;
}
if (p[-1] == ';') {
p--;
}
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t)(p - s) < dst_size) {
len = (int)(p - s);
mg_strlcpy(dst, s, (size_t)len + 1);
}
else {
len = -3;
}
break;
}
}
}
return len;
}
#if defined(USE_WEBSOCKET) || defined(USE_LUA)
static void
base64_encode(const unsigned char *src, int src_len, char *dst)
{
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i, j, a, b, c;
for (i = j = 0; i < src_len; i += 3) {
a = src[i];
b = i + 1 >= src_len ? 0 : src[i + 1];
c = i + 2 >= src_len ? 0 : src[i + 2];
dst[j++] = b64[a >> 2];
dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
if (i + 1 < src_len) {
dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
}
if (i + 2 < src_len) {
dst[j++] = b64[c & 63];
}
}
while (j % 4 != 0) {
dst[j++] = '=';
}
dst[j++] = '\0';
}
#endif
#if defined(USE_LUA)
static unsigned char
b64reverse(char letter)
{
if (letter >= 'A' && letter <= 'Z') {
return letter - 'A';
}
if (letter >= 'a' && letter <= 'z') {
return letter - 'a' + 26;
}
if (letter >= '0' && letter <= '9') {
return letter - '0' + 52;
}
if (letter == '+') {
return 62;
}
if (letter == '/') {
return 63;
}
if (letter == '=') {
return 255; /* normal end */
}
return 254; /* error */
}
static int
base64_decode(const unsigned char *src, int src_len, char *dst, size_t *dst_len)
{
int i;
unsigned char a, b, c, d;
*dst_len = 0;
for (i = 0; i < src_len; i += 4) {
a = b64reverse(src[i]);
if (a >= 254) {
return i;
}
b = b64reverse(i + 1 >= src_len ? 0 : src[i + 1]);
if (b >= 254) {
return i + 1;
}
c = b64reverse(i + 2 >= src_len ? 0 : src[i + 2]);
if (c == 254) {
return i + 2;
}
d = b64reverse(i + 3 >= src_len ? 0 : src[i + 3]);
if (d == 254) {
return i + 3;
}
dst[(*dst_len)++] = (a << 2) + (b >> 4);
if (c != 255) {
dst[(*dst_len)++] = (b << 4) + (c >> 2);
if (d != 255) {
dst[(*dst_len)++] = (c << 6) + d;
}
}
}
return -1;
}
#endif
static int
is_put_or_delete_method(const struct mg_connection *conn)
{
if (conn) {
const char *s = conn->request_info.request_method;
return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE")
|| !strcmp(s, "MKCOL") || !strcmp(s, "PATCH"));
}
return 0;
}
static void
interpret_uri(struct mg_connection *conn, /* in: request (must be valid) */
char *filename, /* out: filename */
size_t filename_buf_len, /* in: size of filename buffer */
struct file *filep, /* out: file structure */
int *is_found, /* out: file is found (directly) */
int *is_script_resource, /* out: handled by a script? */
int *is_websocket_request, /* out: websocket connetion? */
int *is_put_or_delete_request /* out: put/delete a file? */
)
{
/* TODO (high): Restructure this function */
#if !defined(NO_FILES)
const char *uri = conn->request_info.local_uri;
const char *root = conn->ctx->config[DOCUMENT_ROOT];
const char *rewrite;
struct vec a, b;
int match_len;
char gz_path[PATH_MAX];
char const *accept_encoding;
int truncated;
#if !defined(NO_CGI) || defined(USE_LUA)
char *p;
#endif
#else
(void)filename_buf_len; /* unused if NO_FILES is defined */
#endif
memset(filep, 0, sizeof(*filep));
*filename = 0;
*is_found = 0;
*is_script_resource = 0;
*is_put_or_delete_request = is_put_or_delete_method(conn);
#if defined(USE_WEBSOCKET)
*is_websocket_request = is_websocket_protocol(conn);
#if !defined(NO_FILES)
if (*is_websocket_request && conn->ctx->config[WEBSOCKET_ROOT]) {
root = conn->ctx->config[WEBSOCKET_ROOT];
}
#endif /* !NO_FILES */
#else /* USE_WEBSOCKET */
*is_websocket_request = 0;
#endif /* USE_WEBSOCKET */
#if !defined(NO_FILES)
/* Note that root == NULL is a regular use case here. This occurs,
* if all requests are handled by callbacks, so the WEBSOCKET_ROOT
* config is not required. */
if (root == NULL) {
/* all file related outputs have already been set to 0, just return
*/
return;
}
/* Using buf_len - 1 because memmove() for PATH_INFO may shift part
* of the path one byte on the right.
* If document_root is NULL, leave the file empty. */
mg_snprintf(
conn, &truncated, filename, filename_buf_len - 1, "%s%s", root, uri);
if (truncated) {
goto interpret_cleanup;
}
rewrite = conn->ctx->config[REWRITE];
while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(conn,
&truncated,
filename,
filename_buf_len - 1,
"%.*s%s",
(int)b.len,
b.ptr,
uri + match_len);
break;
}
}
if (truncated) {
goto interpret_cleanup;
}
/* Local file path and name, corresponding to requested URI
* is now stored in "filename" variable. */
if (mg_stat(conn, filename, filep)) {
#if !defined(NO_CGI) || defined(USE_LUA) || defined(USE_DUKTAPE)
/* File exists. Check if it is a script type. */
if (0
#if !defined(NO_CGI)
|| match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]),
filename) > 0
#endif
#if defined(USE_LUA)
|| match_prefix(conn->ctx->config[LUA_SCRIPT_EXTENSIONS],
strlen(conn->ctx->config[LUA_SCRIPT_EXTENSIONS]),
filename) > 0
#endif
#if defined(USE_DUKTAPE)
|| match_prefix(conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS],
strlen(
conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS]),
filename) > 0
#endif
) {
/* The request addresses a CGI script or a Lua script. The URI
* corresponds to the script itself (like /path/script.cgi),
* and there is no additional resource path
* (like /path/script.cgi/something).
* Requests that modify (replace or delete) a resource, like
* PUT and DELETE requests, should replace/delete the script
* file.
* Requests that read or write from/to a resource, like GET and
* POST requests, should call the script and return the
* generated response. */
*is_script_resource = !*is_put_or_delete_request;
}
#endif /* !defined(NO_CGI) || defined(USE_LUA) || defined(USE_DUKTAPE) */
*is_found = 1;
return;
}
/* If we can't find the actual file, look for the file
* with the same name but a .gz extension. If we find it,
* use that and set the gzipped flag in the file struct
* to indicate that the response need to have the content-
* encoding: gzip header.
* We can only do this if the browser declares support. */
if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) {
if (strstr(accept_encoding, "gzip") != NULL) {
mg_snprintf(
conn, &truncated, gz_path, sizeof(gz_path), "%s.gz", filename);
if (truncated) {
goto interpret_cleanup;
}
if (mg_stat(conn, gz_path, filep)) {
if (filep) {
filep->gzipped = 1;
*is_found = 1;
}
/* Currently gz files can not be scripts. */
return;
}
}
}
#if !defined(NO_CGI) || defined(USE_LUA) || defined(USE_DUKTAPE)
/* Support PATH_INFO for CGI scripts. */
for (p = filename + strlen(filename); p > filename + 1; p--) {
if (*p == '/') {
*p = '\0';
if ((0
#if !defined(NO_CGI)
|| match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]),
filename) > 0
#endif
#if defined(USE_LUA)
|| match_prefix(conn->ctx->config[LUA_SCRIPT_EXTENSIONS],
strlen(
conn->ctx->config[LUA_SCRIPT_EXTENSIONS]),
filename) > 0
#endif
#if defined(USE_DUKTAPE)
|| match_prefix(
conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS],
strlen(conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS]),
filename) > 0
#endif
) && mg_stat(conn, filename, filep)) {
/* Shift PATH_INFO block one character right, e.g.
* "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
* conn->path_info is pointing to the local variable "path"
* declared in handle_request(), so PATH_INFO is not valid
* after handle_request returns. */
conn->path_info = p + 1;
memmove(p + 2, p + 1, strlen(p + 1) + 1); /* +1 is for
* trailing \0 */
p[1] = '/';
*is_script_resource = 1;
break;
}
else {
*p = '/';
}
}
}
#endif /* !defined(NO_CGI) || defined(USE_LUA) || defined(USE_DUKTAPE) */
#endif /* !defined(NO_FILES) */
return;
#if !defined(NO_FILES)
/* Reset all outputs */
interpret_cleanup:
memset(filep, 0, sizeof(*filep));
*filename = 0;
*is_found = 0;
*is_script_resource = 0;
*is_websocket_request = 0;
*is_put_or_delete_request = 0;
#endif /* !defined(NO_FILES) */
}
/* Check whether full request is buffered. Return:
* -1 if request is malformed
* 0 if request is not yet fully buffered
* >0 actual request length, including last \r\n\r\n */
static int
get_request_len(const char *buf, int buflen)
{
const char *s, *e;
int len = 0;
for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
/* Control characters are not allowed but >=128 is. */
if (!isprint(*(const unsigned char *)s) && *s != '\r' && *s != '\n'
&& *(const unsigned char *)s < 128) {
len = -1;
break; /* [i_a] abort scan as soon as one malformed character is
* found; */
/* don't let subsequent \r\n\r\n win us over anyhow */
}
else if (s[0] == '\n' && s[1] == '\n') {
len = (int)(s - buf) + 2;
}
else if (s[0] == '\n' && &s[1] < e && s[1] == '\r' && s[2] == '\n') {
len = (int)(s - buf) + 3;
}
return len;
}
/* Convert month to the month number. Return -1 on error, or month number */
static int
get_month_index(const char *s)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(month_names); i++) {
if (!strcmp(s, month_names[i])) {
return (int)i;
}
}
return -1;
}
/* Parse UTC date-time string, and return the corresponding time_t value. */
static time_t
parse_date_string(const char *datetime)
{
#if 0
char month_str[32] = { 0 };
int second, minute, hour, day, month, year;
time_t result = (time_t)0;
struct tm tm;
if ((sscanf(datetime,
"%d/%3s/%d %d:%d:%d",
&day,
month_str,
&year,
&hour,
&minute,
&second) == 6) || (sscanf(datetime,
"%d %3s %d %d:%d:%d",
&day,
month_str,
&year,
&hour,
&minute,
&second) == 6)
|| (sscanf(datetime,
"%*3s, %d %3s %d %d:%d:%d",
&day,
month_str,
&year,
&hour,
&minute,
&second) == 6) || (sscanf(datetime,
"%d-%3s-%d %d:%d:%d",
&day,
month_str,
&year,
&hour,
&minute,
&second) == 6)) {
month = get_month_index(month_str);
if ((month >= 0) && (year >= 1970)) {
memset(&tm, 0, sizeof(tm));
tm.tm_year = year - 1900;
tm.tm_mon = month;
tm.tm_mday = day;
tm.tm_hour = hour;
tm.tm_min = minute;
tm.tm_sec = second;
result = timegm(&tm);
}
}
return result;
#else
/* HACK Make Android shut-up >:-O */
return 0;
#endif
}
/* Protect against directory disclosure attack by removing '..',
* excessive '/' and '\' characters */
static void
remove_double_dots_and_double_slashes(char *s)
{
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
/* Skip all following slashes, backslashes and double-dots */
while (s[0] != '\0') {
if (s[0] == '/' || s[0] == '\\') {
s++;
}
else if (s[0] == '.' && s[1] == '.') {
s += 2;
}
else {
break;
}
}
}
}
*p = '\0';
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} builtin_mime_types[] = {
/* IANA registered MIME types (http://www.iana.org/assignments/media-types)
* application types */
{ ".doc", 4, "application/msword" },
{ ".eps", 4, "application/postscript" },
{ ".exe", 4, "application/octet-stream" },
{ ".js", 3, "application/javascript" },
{ ".json", 5, "application/json" },
{ ".pdf", 4, "application/pdf" },
{ ".ps", 3, "application/postscript" },
{ ".rtf", 4, "application/rtf" },
{ ".xhtml", 6, "application/xhtml+xml" },
{ ".xsl", 4, "application/xml" },
{ ".xslt", 5, "application/xml" },
/* fonts */
{ ".ttf", 4, "application/font-sfnt" },
{ ".cff", 4, "application/font-sfnt" },
{ ".otf", 4, "application/font-sfnt" },
{ ".aat", 4, "application/font-sfnt" },
{ ".sil", 4, "application/font-sfnt" },
{ ".pfr", 4, "application/font-tdpfr" },
{ ".woff", 5, "application/font-woff" },
/* audio */
{ ".mp3", 4, "audio/mpeg" },
{ ".oga", 4, "audio/ogg" },
{ ".ogg", 4, "audio/ogg" },
/* image */
{ ".gif", 4, "image/gif" },
{ ".ief", 4, "image/ief" },
{ ".jpeg", 5, "image/jpeg" },
{ ".jpg", 4, "image/jpeg" },
{ ".jpm", 4, "image/jpm" },
{ ".jpx", 4, "image/jpx" },
{ ".png", 4, "image/png" },
{ ".svg", 4, "image/svg+xml" },
{ ".tif", 4, "image/tiff" },
{ ".tiff", 5, "image/tiff" },
/* model */
{ ".wrl", 4, "model/vrml" },
/* text */
{ ".css", 4, "text/css" },
{ ".csv", 4, "text/csv" },
{ ".htm", 4, "text/html" },
{ ".html", 5, "text/html" },
{ ".sgm", 4, "text/sgml" },
{ ".shtm", 5, "text/html" },
{ ".shtml", 6, "text/html" },
{ ".txt", 4, "text/plain" },
{ ".xml", 4, "text/xml" },
/* video */
{ ".mov", 4, "video/quicktime" },
{ ".mp4", 4, "video/mp4" },
{ ".mpeg", 5, "video/mpeg" },
{ ".mpg", 4, "video/mpeg" },
{ ".ogv", 4, "video/ogg" },
{ ".qt", 3, "video/quicktime" },
/* not registered types
* (http://reference.sitepoint.com/html/mime-types-full,
* http://www.hansenb.pdx.edu/DMKB/dict/tutorials/mime_typ.php, ..) */
{ ".arj", 4, "application/x-arj-compressed" },
{ ".gz", 3, "application/x-gunzip" },
{ ".rar", 4, "application/x-arj-compressed" },
{ ".swf", 4, "application/x-shockwave-flash" },
{ ".tar", 4, "application/x-tar" },
{ ".tgz", 4, "application/x-tar-gz" },
{ ".torrent", 8, "application/x-bittorrent" },
{ ".ppt", 4, "application/x-mspowerpoint" },
{ ".xls", 4, "application/x-msexcel" },
{ ".zip", 4, "application/x-zip-compressed" },
{ ".aac",
4,
"audio/aac" }, /* http://en.wikipedia.org/wiki/Advanced_Audio_Coding */
{ ".aif", 4, "audio/x-aif" },
{ ".m3u", 4, "audio/x-mpegurl" },
{ ".mid", 4, "audio/x-midi" },
{ ".ra", 3, "audio/x-pn-realaudio" },
{ ".ram", 4, "audio/x-pn-realaudio" },
{ ".wav", 4, "audio/x-wav" },
{ ".bmp", 4, "image/bmp" },
{ ".ico", 4, "image/x-icon" },
{ ".pct", 4, "image/x-pct" },
{ ".pict", 5, "image/pict" },
{ ".rgb", 4, "image/x-rgb" },
{ ".webm", 5, "video/webm" }, /* http://en.wikipedia.org/wiki/WebM */
{ ".asf", 4, "video/x-ms-asf" },
{ ".avi", 4, "video/x-msvideo" },
{ ".m4v", 4, "video/x-m4v" },
{ NULL, 0, NULL } };
const char *
mg_get_builtin_mime_type(const char *path)
{
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len
&& mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
return builtin_mime_types[i].mime_type;
}
}
return "text/plain";
}
/* Look at the "path" extension and figure what mime type it has.
* Store mime type in the vector. */
static void
get_mime_type(struct mg_context *ctx, const char *path, struct vec *vec)
{
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
if (ctx == NULL || vec == NULL) {
return;
}
/* Scan user-defined mime types first, in case user wants to
* override default mime types. */
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
/* ext now points to the path suffix */
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_builtin_mime_type(path);
vec->len = strlen(vec->ptr);
}
/* Stringify binary data. Output buffer must be twice as big as input,
* because each byte takes 2 bytes in string representation */
static void
bin2str(char *to, const unsigned char *p, size_t len)
{
static const char *hex = "0123456789abcdef";
for (; len--; p++) {
*to++ = hex[p[0] >> 4];
*to++ = hex[p[0] & 0x0f];
}
*to = '\0';
}
/* Return stringified MD5 hash for list of strings. Buffer must be 33 bytes. */
char *
mg_md5(char buf[33], ...)
{
unsigned char hash[16];
const char *p;
va_list ap;
MD5_CTX ctx;
MD5_Init(&ctx);
va_start(ap, buf);
while ((p = va_arg(ap, const char *)) != NULL) {
MD5_Update(&ctx, (const void *)p, strlen(p));
}
va_end(ap);
MD5_Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
return buf;
}
/* Check the user's password, return 1 if OK */
static int
check_password(const char *method,
const char *ha1,
const char *uri,
const char *nonce,
const char *nc,
const char *cnonce,
const char *qop,
const char *response)
{
char ha2[32 + 1], expected_response[32 + 1];
/* Some of the parameters may be NULL */
if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL
|| qop == NULL
|| response == NULL) {
return 0;
}
/* NOTE(lsm): due to a bug in MSIE, we do not compare the URI */
if (strlen(response) != 32) {
return 0;
}
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response,
ha1,
":",
nonce,
":",
nc,
":",
cnonce,
":",
qop,
":",
ha2,
NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
/* Use the global passwords file, if specified by auth_gpass option,
* or search for .htpasswd in the requested directory. */
static void
open_auth_file(struct mg_connection *conn, const char *path, struct file *filep)
{
if (conn != NULL && conn->ctx != NULL) {
char name[PATH_MAX];
const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
struct file file = STRUCT_FILE_INITIALIZER;
int truncated;
if (gpass != NULL) {
/* Use global passwords file */
if (!mg_fopen(conn, gpass, "r", filep)) {
#ifdef DEBUG
mg_cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
#endif
}
/* Important: using local struct file to test path for is_directory
* flag. If filep is used, mg_stat() makes it appear as if auth file
* was opened. */
}
else if (mg_stat(conn, path, &file) && file.is_directory) {
mg_snprintf(conn,
&truncated,
name,
sizeof(name),
"%s/%s",
path,
PASSWORDS_FILE_NAME);
if (truncated || !mg_fopen(conn, name, "r", filep)) {
#ifdef DEBUG
mg_cry(conn, "fopen(%s): %s", name, strerror(ERRNO));
#endif
}
}
else {
/* Try to find .htpasswd in requested directory. */
for (p = path, e = p + strlen(p) - 1; e > p; e--) {
if (e[0] == '/') {
break;
}
}
mg_snprintf(conn,
&truncated,
name,
sizeof(name),
"%.*s%s",
(int)(e - p),
p,
PASSWORDS_FILE_NAME);
if (truncated || !mg_fopen(conn, name, "r", filep)) {
#ifdef DEBUG
mg_cry(conn, "fopen(%s): %s", name, strerror(ERRNO));
#endif
}
}
}
}
/* Parsed Authorization header */
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};
/* Return 1 on success. Always initializes the ah structure. */
static int
parse_auth_header(struct mg_connection *conn,
char *buf,
size_t buf_size,
struct ah *ah)
{
char *name, *value, *s;
const char *auth_header;
uint64_t nonce;
if (!ah || !conn) {
return 0;
}
(void)memset(ah, 0, sizeof(*ah));
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL
|| mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
return 0;
}
/* Make modifiable copy of the auth header */
(void)mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
/* Parse authorization header */
for (;;) {
/* Gobble initial spaces */
while (isspace(*(unsigned char *)s)) {
s++;
}
name = skip_quoted(&s, "=", " ", 0);
/* Value is either quote-delimited, or ends at first comma or space. */
if (s[0] == '\"') {
s++;
value = skip_quoted(&s, "\"", " ", '\\');
if (s[0] == ',') {
s++;
}
}
else {
value = skip_quoted(&s, ", ", " ", 0); /* IE uses commas, FF uses
* spaces */
}
if (*name == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
}
else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
}
else if (!strcmp(name, "response")) {
ah->response = value;
}
else if (!strcmp(name, "uri")) {
ah->uri = value;
}
else if (!strcmp(name, "qop")) {
ah->qop = value;
}
else if (!strcmp(name, "nc")) {
ah->nc = value;
}
else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
#ifndef NO_NONCE_CHECK
/* Read the nonce from the response. */
if (ah->nonce == NULL) {
return 0;
}
s = NULL;
nonce = strtoull(ah->nonce, &s, 10);
if ((s == NULL) || (*s != 0)) {
return 0;
}
/* Convert the nonce from the client to a number. */
nonce ^= conn->ctx->auth_nonce_mask;
/* The converted number corresponds to the time the nounce has been
* created. This should not be earlier than the server start. */
/* Server side nonce check is valuable in all situations but one:
* if the server restarts frequently, but the client should not see
* that, so the server should accept nonces from previous starts. */
/* However, the reasonable default is to not accept a nonce from a
* previous start, so if anyone changed the access rights between
* two restarts, a new login is required. */
if (nonce < (uint64_t)conn->ctx->start_time) {
/* nonce is from a previous start of the server and no longer valid
* (replay attack?) */
return 0;
}
/* Check if the nonce is too high, so it has not (yet) been used by the
* server. */
if (nonce >= ((uint64_t)conn->ctx->start_time + conn->ctx->nonce_count)) {
return 0;
}
#endif
/* CGI needs it as REMOTE_USER */
if (ah->user != NULL) {
conn->request_info.remote_user = mg_strdup(ah->user);
}
else {
return 0;
}
return 1;
}
static char *
mg_fgets(char *buf, size_t size, struct file *filep, char **p)
{
char *eof;
size_t len;
char *memend;
if (!filep) {
return NULL;
}
if (filep->membuf != NULL && *p != NULL) {
memend = (char *)&filep->membuf[filep->size];
/* Search for \n from p till the end of stream */
eof = (char *)memchr(*p, '\n', (size_t)(memend - *p));
if (eof != NULL) {
eof += 1; /* Include \n */
}
else {
eof = memend; /* Copy remaining data */
}
len = (size_t)(eof - *p) > size - 1 ? size - 1 : (size_t)(eof - *p);
memcpy(buf, *p, len);
buf[len] = '\0';
*p += len;
return len ? eof : NULL;
}
else if (filep->fp != NULL) {
return fgets(buf, (int)size, filep->fp);
}
else {
return NULL;
}
}
struct read_auth_file_struct {
struct mg_connection *conn;
struct ah ah;
char *domain;
char buf[256 + 256 + 40];
char *f_user;
char *f_domain;
char *f_ha1;
};
static int
read_auth_file(struct file *filep, struct read_auth_file_struct *workdata)
{
char *p;
int is_authorized = 0;
struct file fp;
size_t l;
if (!filep || !workdata) {
return 0;
}
/* Loop over passwords file */
p = (char *)filep->membuf;
while (mg_fgets(workdata->buf, sizeof(workdata->buf), filep, &p) != NULL) {
l = strlen(workdata->buf);
while (l > 0) {
if (isspace(workdata->buf[l - 1])
|| iscntrl(workdata->buf[l - 1])) {
l--;
workdata->buf[l] = 0;
}
else
break;
}
if (l < 1) {
continue;
}
workdata->f_user = workdata->buf;
if (workdata->f_user[0] == ':') {
/* user names may not contain a ':' and may not be empty,
* so lines starting with ':' may be used for a special purpose */
if (workdata->f_user[1] == '#') {
/* :# is a comment */
continue;
}
else if (!strncmp(workdata->f_user + 1, "include=", 8)) {
if (mg_fopen(workdata->conn, workdata->f_user + 9, "r", &fp)) {
is_authorized = read_auth_file(&fp, workdata);
mg_fclose(&fp);
}
else {
mg_cry(workdata->conn,
"%s: cannot open authorization file: %s",
__func__,
workdata->buf);
}
continue;
}
/* everything is invalid for the moment (might change in the
* future) */
mg_cry(workdata->conn,
"%s: syntax error in authorization file: %s",
__func__,
workdata->buf);
continue;
}
workdata->f_domain = strchr(workdata->f_user, ':');
if (workdata->f_domain == NULL) {
mg_cry(workdata->conn,
"%s: syntax error in authorization file: %s",
__func__,
workdata->buf);
continue;
}
*(workdata->f_domain) = 0;
(workdata->f_domain)++;
workdata->f_ha1 = strchr(workdata->f_domain, ':');
if (workdata->f_ha1 == NULL) {
mg_cry(workdata->conn,
"%s: syntax error in authorization file: %s",
__func__,
workdata->buf);
continue;
}
*(workdata->f_ha1) = 0;
(workdata->f_ha1)++;
if (!strcmp(workdata->ah.user, workdata->f_user)
&& !strcmp(workdata->domain, workdata->f_domain)) {
return check_password(workdata->conn->request_info.request_method,
workdata->f_ha1,
workdata->ah.uri,
workdata->ah.nonce,
workdata->ah.nc,
workdata->ah.cnonce,
workdata->ah.qop,
workdata->ah.response);
}
}
return is_authorized;
}
/* Authorize against the opened passwords file. Return 1 if authorized. */
static int
authorize(struct mg_connection *conn, struct file *filep)
{
struct read_auth_file_struct workdata;
char buf[MG_BUF_LEN];
if (!conn || !conn->ctx) {
return 0;
}
memset(&workdata, 0, sizeof(workdata));
workdata.conn = conn;
if (!parse_auth_header(conn, buf, sizeof(buf), &workdata.ah)) {
return 0;
}
workdata.domain = conn->ctx->config[AUTHENTICATION_DOMAIN];
return read_auth_file(filep, &workdata);
}
/* Return 1 if request is authorised, 0 otherwise. */
static int
check_authorization(struct mg_connection *conn, const char *path)
{
char fname[PATH_MAX];
struct vec uri_vec, filename_vec;
const char *list;
struct file file = STRUCT_FILE_INITIALIZER;
int authorized = 1, truncated;
if (!conn || !conn->ctx) {
return 0;
}
list = conn->ctx->config[PROTECT_URI];
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.local_uri, uri_vec.ptr, uri_vec.len)) {
mg_snprintf(conn,
&truncated,
fname,
sizeof(fname),
"%.*s",
(int)filename_vec.len,
filename_vec.ptr);
if (truncated || !mg_fopen(conn, fname, "r", &file)) {
mg_cry(conn,
"%s: cannot open %s: %s",
__func__,
fname,
strerror(errno));
}
break;
}
}
if (!is_file_opened(&file)) {
open_auth_file(conn, path, &file);
}
if (is_file_opened(&file)) {
authorized = authorize(conn, &file);
mg_fclose(&file);
}
return authorized;
}
static void
send_authorization_request(struct mg_connection *conn)
{
char date[64];
time_t curtime = time(NULL);
if (conn && conn->ctx) {
uint64_t nonce = (uint64_t)(conn->ctx->start_time);
(void)pthread_mutex_lock(&conn->ctx->nonce_mutex);
nonce += conn->ctx->nonce_count;
++conn->ctx->nonce_count;
(void)pthread_mutex_unlock(&conn->ctx->nonce_mutex);
nonce ^= conn->ctx->auth_nonce_mask;
conn->status_code = 401;
conn->must_close = 1;
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn, "HTTP/1.1 401 Unauthorized\r\n");
send_no_cache_header(conn);
mg_printf(conn,
"Date: %s\r\n"
"Connection: %s\r\n"
"Content-Length: 0\r\n"
"WWW-Authenticate: Digest qop=\"auth\", realm=\"%s\", "
"nonce=\"%" UINT64_FMT "\"\r\n\r\n",
date,
suggest_connection_header(conn),
conn->ctx->config[AUTHENTICATION_DOMAIN],
nonce);
}
}
#if !defined(NO_FILES)
static int
is_authorized_for_put(struct mg_connection *conn)
{
if (conn) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
int ret = 0;
if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
ret = authorize(conn, &file);
mg_fclose(&file);
}
return ret;
}
return 0;
}
#endif
int
mg_modify_passwords_file(const char *fname,
const char *domain,
const char *user,
const char *pass)
{
int found, i;
char line[512], u[512] = "", d[512] = "", ha1[33], tmp[PATH_MAX + 8];
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
/* Regard empty password as no password - remove user record. */
if (pass != NULL && pass[0] == '\0') {
pass = NULL;
}
/* Other arguments must not be empty */
if (fname == NULL || domain == NULL || user == NULL) {
return 0;
}
/* Using the given file format, user name and domain must not contain ':'
*/
if (strchr(user, ':') != NULL) {
return 0;
}
if (strchr(domain, ':') != NULL) {
return 0;
}
/* Do not allow control characters like newline in user name and domain.
* Do not allow excessively long names either. */
for (i = 0; i < 255 && user[i] != 0; i++) {
if (iscntrl(user[i])) {
return 0;
}
}
if (user[i]) {
return 0;
}
for (i = 0; i < 255 && domain[i] != 0; i++) {
if (iscntrl(domain[i])) {
return 0;
}
}
if (domain[i]) {
return 0;
}
/* The maximum length of the path to the password file is limited */
if ((strlen(fname) + 4) >= PATH_MAX) {
return 0;
}
/* Create a temporary file name. Length has been checked before. */
strlcpy(tmp, fname, sizeof(tmp));
strlcat(tmp, ".tmp", sizeof(tmp));
/* Create the file if does not exist */
/* Use of fopen here is OK, since fname is only ASCII */
if ((fp = fopen(fname, "a+")) != NULL) {
(void)fclose(fp);
}
/* Open the given file and temporary file */
if ((fp = fopen(fname, "r")) == NULL) {
return 0;
}
else if ((fp2 = fopen(tmp, "w+")) == NULL) {
fclose(fp);
return 0;
}
/* Copy the stuff to temporary file */
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%255[^:]:%255[^:]:%*s", u, d) != 2) {
continue;
}
u[255] = 0;
d[255] = 0;
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
}
else {
fprintf(fp2, "%s", line);
}
}
/* If new user, just add it */
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
/* Close files */
fclose(fp);
fclose(fp2);
/* Put the temp file in place of real file */
IGNORE_UNUSED_RESULT(remove(fname));
IGNORE_UNUSED_RESULT(rename(tmp, fname));
return 1;
}
static int
is_valid_port(unsigned long port)
{
return port < 0xffff;
}
static int
mg_inet_pton(int af, const char *src, void *dst, size_t dstlen)
{
struct addrinfo hints, *res, *ressave;
int ret = 0;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = af;
if (getaddrinfo_retro(src, NULL, &hints, &res) != 0) {
/* bad src string or bad address family */
return 0;
}
ressave = res;
while (res) {
if (dstlen >= res->ai_addrlen) {
memcpy(dst, res->ai_addr, res->ai_addrlen);
ret = 1;
}
res = res->ai_next;
}
freeaddrinfo(ressave);
return ret;
}
static int
connect_socket(struct mg_context *ctx /* may be NULL */,
const char *host,
int port,
int use_ssl,
char *ebuf,
size_t ebuf_len,
SOCKET *sock /* output: socket, must not be NULL */,
union usa *sa /* output: socket address, must not be NULL */
)
{
int ip_ver = 0;
*sock = INVALID_SOCKET;
memset(sa, 0, sizeof(*sa));
if (ebuf_len > 0) {
*ebuf = 0;
}
if (host == NULL) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"NULL host");
return 0;
}
if (port < 0 || !is_valid_port((unsigned)port)) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"invalid port");
return 0;
}
if (use_ssl && (SSLv23_client_method == NULL)) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"SSL is not initialized");
return 0;
}
if (mg_inet_pton(AF_INET, host, &sa->sin, sizeof(sa->sin))) {
sa->sin.sin_port = htons((uint16_t)port);
ip_ver = 4;
#ifdef USE_IPV6
}
else if (mg_inet_pton(AF_INET6, host, &sa->sin6, sizeof(sa->sin6))) {
sa->sin6.sin6_port = htons((uint16_t)port);
ip_ver = 6;
}
else if (host[0] == '[') {
/* While getaddrinfo on Windows will work with [::1],
* getaddrinfo on Linux only works with ::1 (without []). */
size_t l = strlen(host + 1);
char *h = l > 1 ? mg_strdup(host + 1) : NULL;
if (h) {
h[l - 1] = 0;
if (mg_inet_pton(AF_INET6, h, &sa->sin6, sizeof(sa->sin6))) {
sa->sin6.sin6_port = htons((uint16_t)port);
ip_ver = 6;
}
mg_free(h);
}
#endif
}
if (ip_ver == 0) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"host not found");
return 0;
}
if (ip_ver == 4) {
*sock = socket(PF_INET, SOCK_STREAM, 0);
}
#ifdef USE_IPV6
else if (ip_ver == 6) {
*sock = socket(PF_INET6, SOCK_STREAM, 0);
}
#endif
if (*sock == INVALID_SOCKET) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"socket(): %s",
strerror(ERRNO));
return 0;
}
set_close_on_exec(*sock, fc(ctx));
if ((ip_ver == 4)
&& (connect(*sock, (struct sockaddr *)&sa->sin, sizeof(sa->sin))
== 0)) {
/* connected with IPv4 */
return 1;
}
#ifdef USE_IPV6
if ((ip_ver == 6)
&& (connect(*sock, (struct sockaddr *)&sa->sin6, sizeof(sa->sin6))
== 0)) {
/* connected with IPv6 */
return 1;
}
#endif
/* Not connected */
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"connect(%s:%d): %s",
host,
port,
strerror(ERRNO));
closesocket(*sock);
*sock = INVALID_SOCKET;
return 0;
}
int
mg_url_encode(const char *src, char *dst, size_t dst_len)
{
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
char *pos = dst;
const char *end = dst + dst_len - 1;
for (; *src != '\0' && pos < end; src++, pos++) {
if (isalnum(*(const unsigned char *)src)
|| strchr(dont_escape, *(const unsigned char *)src) != NULL) {
*pos = *src;
}
else if (pos + 2 < end) {
pos[0] = '%';
pos[1] = hex[(*(const unsigned char *)src) >> 4];
pos[2] = hex[(*(const unsigned char *)src) & 0xf];
pos += 2;
}
else {
break;
}
}
*pos = '\0';
return (*src == '\0') ? (int)(pos - dst) : -1;
}
static void
print_dir_entry(struct de *de)
{
char size[64], mod[64], href[PATH_MAX];
struct tm *tm;
if (de->file.is_directory) {
mg_snprintf(de->conn,
NULL, /* Buffer is big enough */
size,
sizeof(size),
"%s",
"[DIRECTORY]");
}
else {
/* We use (signed) cast below because MSVC 6 compiler cannot
* convert unsigned __int64 to double. Sigh. */
if (de->file.size < 1024) {
mg_snprintf(de->conn,
NULL, /* Buffer is big enough */
size,
sizeof(size),
"%d",
(int)de->file.size);
}
else if (de->file.size < 0x100000) {
mg_snprintf(de->conn,
NULL, /* Buffer is big enough */
size,
sizeof(size),
"%.1fk",
(double)de->file.size / 1024.0);
}
else if (de->file.size < 0x40000000) {
mg_snprintf(de->conn,
NULL, /* Buffer is big enough */
size,
sizeof(size),
"%.1fM",
(double)de->file.size / 1048576);
}
else {
mg_snprintf(de->conn,
NULL, /* Buffer is big enough */
size,
sizeof(size),
"%.1fG",
(double)de->file.size / 1073741824);
}
}
/* Note: mg_snprintf will not cause a buffer overflow above.
* So, string truncation checks are not required here. */
tm = localtime(&de->file.last_modified);
if (tm != NULL) {
strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", tm);
}
else {
mg_strlcpy(mod, "01-Jan-1970 00:00", sizeof(mod));
mod[sizeof(mod) - 1] = '\0';
}
mg_url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent +=
mg_printf(de->conn,
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
de->conn->request_info.local_uri,
href,
de->file.is_directory ? "/" : "",
de->file_name,
de->file.is_directory ? "/" : "",
mod,
size);
}
/* This function is called from send_directory() and used for
* sorting directory entries by size, or name, or modification time.
* On windows, __cdecl specification is needed in case if project is built
* with __stdcall convention. qsort always requires __cdels callback. */
static int WINCDECL
compare_dir_entries(const void *p1, const void *p2)
{
if (p1 && p2) {
const struct de *a = (const struct de *)p1, *b = (const struct de *)p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL) {
query_string = "na";
}
if (a->file.is_directory && !b->file.is_directory) {
return -1; /* Always put directories on top */
}
else if (!a->file.is_directory && b->file.is_directory) {
return 1; /* Always put directories on top */
}
else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
}
else if (*query_string == 's') {
cmp_result = a->file.size == b->file.size
? 0
: a->file.size > b->file.size ? 1 : -1;
}
else if (*query_string == 'd') {
cmp_result =
(a->file.last_modified == b->file.last_modified)
? 0
: ((a->file.last_modified > b->file.last_modified) ? 1
: -1);
}
return query_string[1] == 'd' ? -cmp_result : cmp_result;
}
return 0;
}
static int
must_hide_file(struct mg_connection *conn, const char *path)
{
if (conn && conn->ctx) {
const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
const char *pattern = conn->ctx->config[HIDE_FILES];
return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0
|| (pattern != NULL
&& match_prefix(pattern, strlen(pattern), path) > 0);
}
return 0;
}
static int
scan_directory(struct mg_connection *conn,
const char *dir,
void *data,
void(*cb)(struct de *, void *))
{
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
int truncated;
if ((dirp = opendir(dir)) == NULL) {
return 0;
}
else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
/* Do not show current dir and hidden files */
if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")
|| must_hide_file(conn, dp->d_name)) {
continue;
}
mg_snprintf(
conn, &truncated, path, sizeof(path), "%s/%s", dir, dp->d_name);
/* If we don't memset stat structure to zero, mtime will have
* garbage and strftime() will segfault later on in
* print_dir_entry(). memset is required only if mg_stat()
* fails. For more details, see
* http://code.google.com/p/mongoose/issues/detail?id=79 */
memset(&de.file, 0, sizeof(de.file));
if (truncated) {
/* If the path is not complete, skip processing. */
continue;
}
if (!mg_stat(conn, path, &de.file)) {
mg_cry(conn,
"%s: mg_stat(%s) failed: %s",
__func__,
path,
strerror(ERRNO));
}
de.file_name = dp->d_name;
cb(&de, data);
}
(void)closedir(dirp);
}
return 1;
}
#if !defined(NO_FILES)
static int
remove_directory(struct mg_connection *conn, const char *dir)
{
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
int truncated;
int ok = 1;
if ((dirp = opendir(dir)) == NULL) {
return 0;
}
else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
/* Do not show current dir (but show hidden files as they will
* also be removed) */
if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) {
continue;
}
mg_snprintf(
conn, &truncated, path, sizeof(path), "%s/%s", dir, dp->d_name);
/* If we don't memset stat structure to zero, mtime will have
* garbage and strftime() will segfault later on in
* print_dir_entry(). memset is required only if mg_stat()
* fails. For more details, see
* http://code.google.com/p/mongoose/issues/detail?id=79 */
memset(&de.file, 0, sizeof(de.file));
if (truncated) {
/* Do not delete anything shorter */
ok = 0;
continue;
}
if (!mg_stat(conn, path, &de.file)) {
mg_cry(conn,
"%s: mg_stat(%s) failed: %s",
__func__,
path,
strerror(ERRNO));
ok = 0;
}
if (de.file.membuf == NULL) {
/* file is not in memory */
if (de.file.is_directory) {
if (remove_directory(conn, path) == 0) {
ok = 0;
}
}
else {
if (mg_remove(path) == 0) {
ok = 0;
}
}
}
else {
/* file is in memory. It can not be deleted. */
ok = 0;
}
}
(void)closedir(dirp);
IGNORE_UNUSED_RESULT(rmdir(dir));
}
return ok;
}
#endif
struct dir_scan_data {
struct de *entries;
unsigned int num_entries;
unsigned int arr_size;
};
/* Behaves like realloc(), but frees original pointer on failure */
static void *
realloc2(void *ptr, size_t size)
{
void *new_ptr = mg_realloc(ptr, size);
if (new_ptr == NULL) {
mg_free(ptr);
}
return new_ptr;
}
static void
dir_scan_callback(struct de *de, void *data)
{
struct dir_scan_data *dsd = (struct dir_scan_data *)data;
if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
dsd->arr_size *= 2;
dsd->entries =
(struct de *)realloc2(dsd->entries,
dsd->arr_size * sizeof(dsd->entries[0]));
}
if (dsd->entries == NULL) {
/* TODO(lsm, low): propagate an error to the caller */
dsd->num_entries = 0;
}
else {
dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
dsd->entries[dsd->num_entries].file = de->file;
dsd->entries[dsd->num_entries].conn = de->conn;
dsd->num_entries++;
}
}
static void
handle_directory_request(struct mg_connection *conn, const char *dir)
{
unsigned int i;
int sort_direction;
struct dir_scan_data data = { NULL, 0, 128 };
char date[64];
time_t curtime = time(NULL);
if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
send_http_error(conn,
500,
"Error: Cannot open directory\nopendir(%s): %s",
dir,
strerror(ERRNO));
return;
}
gmt_time_string(date, sizeof(date), &curtime);
if (!conn) {
return;
}
sort_direction = conn->request_info.query_string != NULL
&& conn->request_info.query_string[1] == 'd'
? 'a'
: 'd';
conn->must_close = 1;
mg_printf(conn, "HTTP/1.1 200 OK\r\n");
send_static_cache_header(conn);
mg_printf(conn,
"Date: %s\r\n"
"Connection: close\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n",
date);
conn->num_bytes_sent +=
mg_printf(conn,
"<html><head><title>Index of %s</title>"
"<style>th {text-align: left;}</style></head>"
"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
"<tr><th><a href=\"?n%c\">Name</a></th>"
"<th><a href=\"?d%c\">Modified</a></th>"
"<th><a href=\"?s%c\">Size</a></th></tr>"
"<tr><td colspan=\"3\"><hr></td></tr>",
conn->request_info.local_uri,
conn->request_info.local_uri,
sort_direction,
sort_direction,
sort_direction);
/* Print first entry - link to a parent directory */
conn->num_bytes_sent +=
mg_printf(conn,
"<tr><td><a href=\"%s%s\">%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
conn->request_info.local_uri,
"..",
"Parent directory",
"-",
"-");
/* Sort and print directory entries */
if (data.entries != NULL) {
qsort(data.entries,
(size_t)data.num_entries,
sizeof(data.entries[0]),
compare_dir_entries);
for (i = 0; i < data.num_entries; i++) {
print_dir_entry(&data.entries[i]);
mg_free(data.entries[i].file_name);
}
mg_free(data.entries);
}
conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
conn->status_code = 200;
}
/* Send len bytes from the opened file to the client. */
static void
send_file_data(struct mg_connection *conn,
struct file *filep,
int64_t offset,
int64_t len)
{
char buf[MG_BUF_LEN];
int to_read, num_read, num_written;
int64_t size;
if (!filep || !conn) {
return;
}
/* Sanity check the offset */
size = filep->size > INT64_MAX ? INT64_MAX : (int64_t)(filep->size);
offset = offset < 0 ? 0 : offset > size ? size : offset;
if (len > 0 && filep->membuf != NULL && size > 0) {
/* file stored in memory */
if (len > size - offset) {
len = size - offset;
}
mg_write(conn, filep->membuf + offset, (size_t)len);
}
else if (len > 0 && filep->fp != NULL) {
/* file stored on disk */
#if defined(__linux__)
/* sendfile is only available for Linux */
if (conn->throttle == 0 && conn->ssl == 0) {
off_t sf_offs = (off_t)offset;
ssize_t sf_sent;
int sf_file = fileno(filep->fp);
int loop_cnt = 0;
do {
/* 2147479552 (0x7FFFF000) is a limit found by experiment on
* 64 bit Linux (2^31 minus one memory page of 4k?). */
size_t sf_tosend =
(size_t)((len < 0x7FFFF000) ? len : 0x7FFFF000);
sf_sent =
sendfile(conn->client.sock, sf_file, &sf_offs, sf_tosend);
if (sf_sent > 0) {
conn->num_bytes_sent += sf_sent;
len -= sf_sent;
offset += sf_sent;
}
else if (loop_cnt == 0) {
/* This file can not be sent using sendfile.
* This might be the case for pseudo-files in the
* /sys/ and /proc/ file system.
* Use the regular user mode copy code instead. */
break;
}
else if (sf_sent == 0) {
/* No error, but 0 bytes sent. May be EOF? */
return;
}
loop_cnt++;
} while ((len > 0) && (sf_sent >= 0));
if (sf_sent > 0) {
return; /* OK */
}
/* sf_sent<0 means error, thus fall back to the classic way */
/* This is always the case, if sf_file is not a "normal" file,
* e.g., for sending data from the output of a CGI process. */
offset = (int64_t)sf_offs;
}
#endif
if ((offset > 0) && (fseeko(filep->fp, offset, SEEK_SET) != 0)) {
mg_cry(conn, "%s: fseeko() failed: %s", __func__, strerror(ERRNO));
send_http_error(
conn,
500,
"%s",
"Error: Unable to access file at requested position.");
}
else {
while (len > 0) {
/* Calculate how much to read from the file in the buffer */
to_read = sizeof(buf);
if ((int64_t)to_read > len) {
to_read = (int)len;
}
/* Read from file, exit the loop on error */
if ((num_read = (int)fread(buf, 1, (size_t)to_read, filep->fp))
<= 0) {
break;
}
/* Send read bytes to the client, exit the loop on error */
if ((num_written = mg_write(conn, buf, (size_t)num_read))
!= num_read) {
break;
}
/* Both read and were successful, adjust counters */
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
}
}
static int
parse_range_header(const char *header, int64_t *a, int64_t *b)
{
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void
construct_etag(char *buf, size_t buf_len, const struct file *filep)
{
if (filep != NULL && buf != NULL) {
mg_snprintf(NULL,
NULL, /* All calls to construct_etag use 64 byte buffer */
buf,
buf_len,
"\"%lx.%" INT64_FMT "\"",
(unsigned long)filep->last_modified,
filep->size);
}
}
static void
fclose_on_exec(struct file *filep, struct mg_connection *conn)
{
if (filep != NULL && filep->fp != NULL) {
#ifdef _WIN32
(void)conn; /* Unused. */
#else
if (fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC) != 0) {
mg_cry(conn,
"%s: fcntl(F_SETFD FD_CLOEXEC) failed: %s",
__func__,
strerror(ERRNO));
}
#endif
}
}
static void
handle_static_file_request(struct mg_connection *conn,
const char *path,
struct file *filep,
const char *mime_type)
{
char date[64], lm[64], etag[64];
char range[128]; /* large enough, so there will be no overflow */
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
int n, truncated;
char gz_path[PATH_MAX];
const char *encoding = "";
const char *cors1, *cors2, *cors3;
if (conn == NULL || conn->ctx == NULL || filep == NULL) {
return;
}
if (mime_type == NULL) {
get_mime_type(conn->ctx, path, &mime_vec);
}
else {
mime_vec.ptr = mime_type;
mime_vec.len = strlen(mime_type);
}
if (filep->size > INT64_MAX) {
send_http_error(conn,
500,
"Error: File size is too large to send\n%" INT64_FMT,
filep->size);
}
cl = (int64_t)filep->size;
conn->status_code = 200;
range[0] = '\0';
/* if this file is in fact a pre-gzipped file, rewrite its filename
* it's important to rewrite the filename after resolving
* the mime type from it, to preserve the actual file's type */
if (filep->gzipped) {
mg_snprintf(conn, &truncated, gz_path, sizeof(gz_path), "%s.gz", path);
if (truncated) {
send_http_error(conn,
500,
"Error: Path of zipped file too long (%s)",
path);
return;
}
path = gz_path;
encoding = "Content-Encoding: gzip\r\n";
}
if (!mg_fopen(conn, path, "rb", filep)) {
send_http_error(conn,
500,
"Error: Cannot open file\nfopen(%s): %s",
path,
strerror(ERRNO));
return;
}
fclose_on_exec(filep, conn);
/* If Range: header specified, act accordingly */
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 && r1 >= 0
&& r2 >= 0) {
/* actually, range requests don't play well with a pre-gzipped
* file (since the range is specified in the uncompressed space) */
if (filep->gzipped) {
send_http_error(
conn,
501,
"%s",
"Error: Range requests in gzipped files are not supported");
mg_fclose(filep);
return;
}
conn->status_code = 206;
cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1 : cl - r1;
mg_snprintf(conn,
NULL, /* range buffer is big enough */
range,
sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%" INT64_FMT "/%" INT64_FMT "\r\n",
r1,
r1 + cl - 1,
filep->size);
msg = "Partial Content";
}
hdr = mg_get_header(conn, "Origin");
if (hdr) {
/* Cross-origin resource sharing (CORS), see
* http://www.html5rocks.com/en/tutorials/cors/,
* http://www.html5rocks.com/static/images/cors_server_flowchart.png -
* preflight is not supported for files. */
cors1 = "Access-Control-Allow-Origin: ";
cors2 = conn->ctx->config[ACCESS_CONTROL_ALLOW_ORIGIN];
cors3 = "\r\n";
}
else {
cors1 = cors2 = cors3 = "";
}
/* Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3 */
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &filep->last_modified);
construct_etag(etag, sizeof(etag), filep);
(void)mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"%s%s%s"
"Date: %s\r\n",
conn->status_code,
msg,
cors1,
cors2,
cors3,
date);
send_static_cache_header(conn);
(void)mg_printf(conn,
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s%s\r\n",
lm,
etag,
(int)mime_vec.len,
mime_vec.ptr,
cl,
suggest_connection_header(conn),
range,
encoding);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, filep, r1, cl);
}
mg_fclose(filep);
}
void
mg_send_file(struct mg_connection *conn, const char *path)
{
mg_send_mime_file(conn, path, NULL);
}
void
mg_send_mime_file(struct mg_connection *conn,
const char *path,
const char *mime_type)
{
struct file file = STRUCT_FILE_INITIALIZER;
if (mg_stat(conn, path, &file)) {
if (file.is_directory) {
if (!conn) {
return;
}
if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING],
"yes")) {
handle_directory_request(conn, path);
}
else {
send_http_error(conn,
403,
"%s",
"Error: Directory listing denied");
}
}
else {
handle_static_file_request(conn, path, &file, mime_type);
}
}
else {
send_http_error(conn, 404, "%s", "Error: File not found");
}
}
/* For a given PUT path, create all intermediate subdirectories.
* Return 0 if the path itself is a directory.
* Return 1 if the path leads to a file.
* Return -1 for if the path is too long.
* Return -2 if path can not be created.
*/
static int
put_dir(struct mg_connection *conn, const char *path)
{
char buf[PATH_MAX];
const char *s, *p;
struct file file = STRUCT_FILE_INITIALIZER;
size_t len;
int res = 1;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = (size_t)(p - path);
if (len >= sizeof(buf)) {
/* path too long */
res = -1;
break;
}
memcpy(buf, path, len);
buf[len] = '\0';
/* Try to create intermediate directory */
DEBUG_TRACE("mkdir(%s)", buf);
if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
/* path does not exixt and can not be created */
res = -2;
break;
}
/* Is path itself a directory? */
if (p[1] == '\0') {
res = 0;
}
}
return res;
}
static void
remove_bad_file(const struct mg_connection *conn, const char *path)
{
int r = mg_remove(path);
if (r != 0) {
mg_cry(conn, "%s: Cannot remove invalid file %s", __func__, path);
}
}
long long
mg_store_body(struct mg_connection *conn, const char *path)
{
char buf[MG_BUF_LEN];
long long len = 0;
int ret, n;
struct file fi;
if (conn->consumed_content != 0) {
mg_cry(conn, "%s: Contents already consumed", __func__);
return -11;
}
ret = put_dir(conn, path);
if (ret < 0) {
/* -1 for path too long,
* -2 for path can not be created. */
return ret;
}
if (ret != 1) {
/* Return 0 means, path itself is a directory. */
return 0;
}
if (mg_fopen(conn, path, "w", &fi) == 0) {
return -12;
}
ret = mg_read(conn, buf, sizeof(buf));
while (ret > 0) {
n = (int)fwrite(buf, 1, (size_t)ret, fi.fp);
if (n != ret) {
fclose(fi.fp);
remove_bad_file(conn, path);
return -13;
}
ret = mg_read(conn, buf, sizeof(buf));
}
/* TODO: mg_fclose should return an error,
* and every caller should check and handle it. */
if (fclose(fi.fp) != 0) {
remove_bad_file(conn, path);
return -14;
}
return len;
}
/* Parse HTTP headers from the given buffer, advance buffer to the point
* where parsing stopped. */
static void
parse_http_headers(char **buf, struct mg_request_info *ri)
{
int i;
if (!ri) {
return;
}
ri->num_headers = 0;
for (i = 0; i < (int)ARRAY_SIZE(ri->http_headers); i++) {
char *dp = *buf;
while ((*dp != ':') && (*dp != '\r') && (*dp != 0)) {
dp++;
}
if (!*dp) {
/* neither : nor \r\n. This is not a valid field. */
break;
}
if (*dp == '\r') {
if (dp[1] == '\n') {
/* \r\n */
ri->http_headers[i].name = *buf;
ri->http_headers[i].value = 0;
*buf = dp;
}
else {
/* stray \r. This is not valid. */
break;
}
}
else {
/* (*dp == ':') */
*dp = 0;
ri->http_headers[i].name = *buf;
do {
dp++;
} while (*dp == ' ');
ri->http_headers[i].value = dp;
*buf = strstr(dp, "\r\n");
}
ri->num_headers = i + 1;
if (*buf) {
(*buf)[0] = 0;
(*buf)[1] = 0;
*buf += 2;
}
else {
*buf = dp;
break;
}
if (*buf[0] == '\r') {
/* This is the end of the header */
break;
}
}
}
static int
is_valid_http_method(const char *method)
{
return !strcmp(method, "GET") /* HTTP (RFC 2616) */
|| !strcmp(method, "POST") /* HTTP (RFC 2616) */
|| !strcmp(method, "HEAD") /* HTTP (RFC 2616) */
|| !strcmp(method, "PUT") /* HTTP (RFC 2616) */
|| !strcmp(method, "DELETE") /* HTTP (RFC 2616) */
|| !strcmp(method, "OPTIONS") /* HTTP (RFC 2616) */
/* TRACE method (RFC 2616) is not supported for security reasons */
|| !strcmp(method, "CONNECT") /* HTTP (RFC 2616) */
|| !strcmp(method, "PROPFIND") /* WEBDAV (RFC 2518) */
|| !strcmp(method, "MKCOL") /* WEBDAV (RFC 2518) */
/* Unsupported WEBDAV Methods: */
/* PROPPATCH, COPY, MOVE, LOCK, UNLOCK (RFC 2518) */
/* + 11 methods from RFC 3253 */
/* ORDERPATCH (RFC 3648) */
/* ACL (RFC 3744) */
/* SEARCH (RFC 5323) */
/* + MicroSoft extensions
* https://msdn.microsoft.com/en-us/library/aa142917.aspx */
/* PATCH method only allowed for CGI/Lua/LSP and callbacks. */
|| !strcmp(method, "PATCH"); /* PATCH method (RFC 5789) */
}
/* Parse HTTP request, fill in mg_request_info structure.
* This function modifies the buffer by NUL-terminating
* HTTP request components, header names and header values. */
static int
parse_http_message(char *buf, int len, struct mg_request_info *ri)
{
int is_request, request_length;
if (!ri) {
return 0;
}
request_length = get_request_len(buf, len);
if (request_length > 0) {
/* Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_addr,
* remote_port */
ri->remote_user = ri->request_method = ri->request_uri =
ri->http_version = NULL;
ri->num_headers = 0;
buf[request_length - 1] = '\0';
/* RFC says that all initial whitespaces should be ingored */
while (*buf != '\0' && isspace(*(unsigned char *)buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->request_uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
/* HTTP message could be either HTTP request or HTTP response, e.g.
* "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..." */
is_request = is_valid_http_method(ri->request_method);
if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0)
|| (!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
request_length = -1;
}
else {
if (is_request) {
ri->http_version += 5;
}
parse_http_headers(&buf, ri);
}
}
return request_length;
}
/* Keep reading the input (either opened file descriptor fd, or socket sock,
* or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
* buffer (which marks the end of HTTP request). Buffer buf may already
* have some data. The length of the data is stored in nread.
* Upon every read operation, increase nread by the number of bytes read. */
static int
read_request(FILE *fp,
struct mg_connection *conn,
char *buf,
int bufsiz,
int *nread)
{
int request_len, n = 0;
struct timespec last_action_time;
double request_timeout;
if (!conn) {
return 0;
}
memset(&last_action_time, 0, sizeof(last_action_time));
if (conn->ctx->config[REQUEST_TIMEOUT]) {
/* value of request_timeout is in seconds, config in milliseconds */
request_timeout = atof(conn->ctx->config[REQUEST_TIMEOUT]) / 1000.0;
}
else {
request_timeout = -1.0;
}
request_len = get_request_len(buf, *nread);
/* first time reading from this connection */
clock_gettime(CLOCK_MONOTONIC, &last_action_time);
while (
(conn->ctx->stop_flag == 0) && (*nread < bufsiz) && (request_len == 0)
&& ((mg_difftimespec(&last_action_time, &(conn->req_time))
<= request_timeout) || (request_timeout < 0))
&& ((n = pull(fp, conn, buf + *nread, bufsiz - *nread, request_timeout))
> 0)) {
*nread += n;
/* assert(*nread <= bufsiz); */
if (*nread > bufsiz) {
return -2;
}
request_len = get_request_len(buf, *nread);
if (request_timeout > 0.0) {
clock_gettime(CLOCK_MONOTONIC, &last_action_time);
}
}
return (request_len <= 0 && n <= 0) ? -1 : request_len;
}
#if !defined(NO_FILES)
/* For given directory path, substitute it to valid index file.
* Return 1 if index file has been found, 0 if not found.
* If the file is found, it's stats is returned in stp. */
static int
substitute_index_file(struct mg_connection *conn,
char *path,
size_t path_len,
struct file *filep)
{
if (conn && conn->ctx) {
const char *list = conn->ctx->config[INDEX_FILES];
struct file file = STRUCT_FILE_INITIALIZER;
struct vec filename_vec;
size_t n = strlen(path);
int found = 0;
/* The 'path' given to us points to the directory. Remove all trailing
* directory separator characters from the end of the path, and
* then append single directory separator character. */
while (n > 0 && path[n - 1] == '/') {
n--;
}
path[n] = '/';
/* Traverse index files list. For each entry, append it to the given
* path and see if the file exists. If it exists, break the loop */
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
/* Ignore too long entries that may overflow path buffer */
if (filename_vec.len > path_len - (n + 2)) {
continue;
}
/* Prepare full path to the index file */
mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
/* Does it exist? */
if (mg_stat(conn, path, &file)) {
/* Yes it does, break the loop */
*filep = file;
found = 1;
break;
}
}
/* If no index file exists, restore directory path */
if (!found) {
path[n] = '\0';
}
return found;
}
return 0;
}
#endif
/* Return True if we should reply 304 Not Modified. */
static int
is_not_modified(const struct mg_connection *conn, const struct file *filep)
{
char etag[64];
const char *ims = mg_get_header(conn, "If-Modified-Since");
const char *inm = mg_get_header(conn, "If-None-Match");
construct_etag(etag, sizeof(etag), filep);
if (!filep) {
return 0;
}
return (inm != NULL && !mg_strcasecmp(etag, inm))
|| (ims != NULL && (filep->last_modified <= parse_date_string(ims)));
}
#if !defined(NO_CGI) || !defined(NO_FILES)
static int
forward_body_data(struct mg_connection *conn, FILE *fp, SOCKET sock, SSL *ssl)
{
const char *expect, *body;
char buf[MG_BUF_LEN];
int to_read, nread, success = 0;
int64_t buffered_len;
double timeout = -1.0;
if (!conn) {
return 0;
}
if (conn->ctx->config[REQUEST_TIMEOUT]) {
timeout = atoi(conn->ctx->config[REQUEST_TIMEOUT]) / 1000.0;
}
expect = mg_get_header(conn, "Expect");
/* assert(fp != NULL); */
if (!fp) {
send_http_error(conn, 500, "%s", "Error: NULL File");
return 0;
}
if (conn->content_len == -1 && !conn->is_chunked) {
/* Content length is not specified by the client. */
send_http_error(conn,
411,
"%s",
"Error: Client did not specify content length");
}
else if ((expect != NULL)
&& (mg_strcasecmp(expect, "100-continue") != 0)) {
/* Client sent an "Expect: xyz" header and xyz is not 100-continue. */
send_http_error(conn,
417,
"Error: Can not fulfill expectation %s",
expect);
}
else {
if (expect != NULL) {
(void)mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
conn->status_code = 100;
}
else {
conn->status_code = 200;
}
buffered_len = (int64_t)(conn->data_len) - (int64_t)conn->request_len
- conn->consumed_content;
/* assert(buffered_len >= 0); */
/* assert(conn->consumed_content == 0); */
if ((buffered_len < 0) || (conn->consumed_content != 0)) {
send_http_error(conn, 500, "%s", "Error: Size mismatch");
return 0;
}
if (buffered_len > 0) {
if ((int64_t)buffered_len > conn->content_len) {
buffered_len = (int)conn->content_len;
}
body = conn->buf + conn->request_len + conn->consumed_content;
push_all(conn->ctx, fp, sock, ssl, body, (int64_t)buffered_len);
conn->consumed_content += buffered_len;
}
nread = 0;
while (conn->consumed_content < conn->content_len) {
to_read = sizeof(buf);
if ((int64_t)to_read > conn->content_len - conn->consumed_content) {
to_read = (int)(conn->content_len - conn->consumed_content);
}
nread = pull(NULL, conn, buf, to_read, timeout);
if (nread <= 0
|| push_all(conn->ctx, fp, sock, ssl, buf, nread) != nread) {
break;
}
conn->consumed_content += nread;
}
if (conn->consumed_content == conn->content_len) {
success = (nread >= 0);
}
/* Each error code path in this function must send an error */
if (!success) {
/* NOTE: Maybe some data has already been sent. */
/* TODO (low): If some data has been sent, a correct error
* reply can no longer be sent, so just close the connection */
send_http_error(conn, 500, "%s", "");
}
}
return success;
}
#endif
#if !defined(NO_CGI)
/* This structure helps to create an environment for the spawned CGI program.
* Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
* last element must be NULL.
* However, on Windows there is a requirement that all these VARIABLE=VALUE\0
* strings must reside in a contiguous buffer. The end of the buffer is
* marked by two '\0' characters.
* We satisfy both worlds: we create an envp array (which is vars), all
* entries are actually pointers inside buf. */
struct cgi_environment {
struct mg_connection *conn;
/* Data block */
char *buf; /* Environment buffer */
size_t buflen; /* Space available in buf */
size_t bufused; /* Space taken in buf */
/* Index block */
char **var; /* char **envp */
size_t varlen; /* Number of variables available in var */
size_t varused; /* Number of variables stored in var */
};
static void addenv(struct cgi_environment *env,
PRINTF_FORMAT_STRING(const char *fmt),
...) PRINTF_ARGS(2, 3);
/* Append VARIABLE=VALUE\0 string to the buffer, and add a respective
* pointer into the vars array. Assumes env != NULL and fmt != NULL. */
static void
addenv(struct cgi_environment *env, const char *fmt, ...)
{
size_t n, space;
int truncated;
char *added;
va_list ap;
/* Calculate how much space is left in the buffer */
space = (env->buflen - env->bufused);
/* Calculate an estimate for the required space */
n = strlen(fmt) + 2 + 128;
do {
if (space <= n) {
/* Allocate new buffer */
n = env->buflen + CGI_ENVIRONMENT_SIZE;
added = (char *)mg_realloc(env->buf, n);
if (!added) {
/* Out of memory */
mg_cry(env->conn,
"%s: Cannot allocate memory for CGI variable [%s]",
__func__,
fmt);
return;
}
env->buf = added;
env->buflen = n;
space = (env->buflen - env->bufused);
}
/* Make a pointer to the free space int the buffer */
added = env->buf + env->bufused;
/* Copy VARIABLE=VALUE\0 string into the free space */
va_start(ap, fmt);
mg_vsnprintf(env->conn, &truncated, added, (size_t)space, fmt, ap);
va_end(ap);
/* Do not add truncated strings to the environment */
if (truncated) {
/* Reallocate the buffer */
space = 0;
n = 1;
}
} while (truncated);
/* Calculate number of bytes added to the environment */
n = strlen(added) + 1;
env->bufused += n;
/* Now update the variable index */
space = (env->varlen - env->varused);
if (space < 2) {
mg_cry(env->conn,
"%s: Cannot register CGI variable [%s]",
__func__,
fmt);
return;
}
/* Append a pointer to the added string into the envp array */
env->var[env->varused] = added;
env->varused++;
}
static void
prepare_cgi_environment(struct mg_connection *conn,
const char *prog,
struct cgi_environment *env)
{
const char *s;
struct vec var_vec;
char *p, src_addr[IP_ADDR_STR_LEN], http_var_name[128];
int i, truncated;
if (conn == NULL || prog == NULL || env == NULL) {
return;
}
env->conn = conn;
env->buflen = CGI_ENVIRONMENT_SIZE;
env->bufused = 0;
env->buf = (char *)mg_malloc(env->buflen);
env->varlen = MAX_CGI_ENVIR_VARS;
env->varused = 0;
env->var = (char **)mg_malloc(env->buflen * sizeof(char *));
addenv(env, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
addenv(env, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(env, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(env, "SERVER_SOFTWARE=%s/%s", "Civetweb", mg_version());
/* Prepare the environment block */
addenv(env, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(env, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(env, "%s", "REDIRECT_STATUS=200"); /* For PHP */
#if defined(USE_IPV6)
if (conn->client.lsa.sa.sa_family == AF_INET6) {
addenv(env, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin6.sin6_port));
}
else
#endif
{
addenv(env, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
}
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
addenv(env, "REMOTE_ADDR=%s", src_addr);
addenv(env, "REQUEST_METHOD=%s", conn->request_info.request_method);
addenv(env, "REMOTE_PORT=%d", conn->request_info.remote_port);
addenv(env, "REQUEST_URI=%s", conn->request_info.request_uri);
addenv(env, "LOCAL_URI=%s", conn->request_info.local_uri);
/* SCRIPT_NAME */
addenv(env,
"SCRIPT_NAME=%.*s",
(int)strlen(conn->request_info.local_uri)
- ((conn->path_info == NULL) ? 0 : (int)strlen(conn->path_info)),
conn->request_info.local_uri);
addenv(env, "SCRIPT_FILENAME=%s", prog);
if (conn->path_info == NULL) {
addenv(env, "PATH_TRANSLATED=%s", conn->ctx->config[DOCUMENT_ROOT]);
}
else {
addenv(env,
"PATH_TRANSLATED=%s%s",
conn->ctx->config[DOCUMENT_ROOT],
conn->path_info);
}
addenv(env, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL) {
addenv(env, "CONTENT_TYPE=%s", s);
}
if (conn->request_info.query_string != NULL) {
addenv(env, "QUERY_STRING=%s", conn->request_info.query_string);
}
if ((s = mg_get_header(conn, "Content-Length")) != NULL) {
addenv(env, "CONTENT_LENGTH=%s", s);
}
if ((s = getenv("PATH")) != NULL) {
addenv(env, "PATH=%s", s);
}
if (conn->path_info != NULL) {
addenv(env, "PATH_INFO=%s", conn->path_info);
}
if (conn->status_code > 0) {
/* CGI error handler should show the status code */
addenv(env, "STATUS=%d", conn->status_code);
}
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL) {
addenv(env, "COMSPEC=%s", s);
}
if ((s = getenv("SYSTEMROOT")) != NULL) {
addenv(env, "SYSTEMROOT=%s", s);
}
if ((s = getenv("SystemDrive")) != NULL) {
addenv(env, "SystemDrive=%s", s);
}
if ((s = getenv("ProgramFiles")) != NULL) {
addenv(env, "ProgramFiles=%s", s);
}
if ((s = getenv("ProgramFiles(x86)")) != NULL) {
addenv(env, "ProgramFiles(x86)=%s", s);
}
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL) {
addenv(env, "LD_LIBRARY_PATH=%s", s);
}
#endif /* _WIN32 */
if ((s = getenv("PERLLIB")) != NULL) {
addenv(env, "PERLLIB=%s", s);
}
if (conn->request_info.remote_user != NULL) {
addenv(env, "REMOTE_USER=%s", conn->request_info.remote_user);
addenv(env, "%s", "AUTH_TYPE=Digest");
}
/* Add all headers as HTTP_* variables */
for (i = 0; i < conn->request_info.num_headers; i++) {
(void)mg_snprintf(conn,
&truncated,
http_var_name,
sizeof(http_var_name),
"HTTP_%s",
conn->request_info.http_headers[i].name);
if (truncated) {
mg_cry(conn,
"%s: HTTP header variable too long [%s]",
__func__,
conn->request_info.http_headers[i].name);
continue;
}
/* Convert variable name into uppercase, and change - to _ */
for (p = http_var_name; *p != '\0'; p++) {
if (*p == '-') {
*p = '_';
}
*p = (char)toupper(*(unsigned char *)p);
}
addenv(env,
"%s=%s",
http_var_name,
conn->request_info.http_headers[i].value);
}
/* Add user-specified variables */
s = conn->ctx->config[CGI_ENVIRONMENT];
while ((s = next_option(s, &var_vec, NULL)) != NULL) {
addenv(env, "%.*s", (int)var_vec.len, var_vec.ptr);
}
env->var[env->varused] = NULL;
env->buf[env->bufused] = '\0';
}
static void
handle_cgi_request(struct mg_connection *conn, const char *prog)
{
char *buf;
size_t buflen;
int headers_len, data_len, i, truncated;
int fdin[2] = { -1, -1 }, fdout[2] = { -1, -1 }, fderr[2] = { -1, -1 };
const char *status, *status_text, *connection_state;
char *pbuf, dir[PATH_MAX], *p;
struct mg_request_info ri;
struct cgi_environment blk;
FILE *in = NULL, *out = NULL, *err = NULL;
struct file fout = STRUCT_FILE_INITIALIZER;
pid_t pid = (pid_t)-1;
if (conn == NULL) {
return;
}
buf = NULL;
buflen = 16384;
prepare_cgi_environment(conn, prog, &blk);
/* CGI must be executed in its own directory. 'dir' must point to the
* directory containing executable program, 'p' must point to the
* executable program name relative to 'dir'. */
(void)mg_snprintf(conn, &truncated, dir, sizeof(dir), "%s", prog);
if (truncated) {
mg_cry(conn, "Error: CGI program \"%s\": Path too long", prog);
send_http_error(conn, 500, "Error: %s", "CGI path too long");
goto done;
}
if ((p = strrchr(dir, '/')) != NULL) {
*p++ = '\0';
}
else {
dir[0] = '.', dir[1] = '\0';
p = (char *)prog;
}
if (pipe(fdin) != 0 || pipe(fdout) != 0 || pipe(fderr) != 0) {
status = strerror(ERRNO);
mg_cry(conn,
"Error: CGI program \"%s\": Can not create CGI pipes: %s",
prog,
status);
send_http_error(conn, 500, "Error: Cannot create CGI pipe: %s", status);
goto done;
}
pid = spawn_process(
conn, p, blk.buf, blk.var, fdin[0], fdout[1], fderr[1], dir);
if (pid == (pid_t)-1) {
status = strerror(ERRNO);
mg_cry(conn,
"Error: CGI program \"%s\": Can not spawn CGI process: %s",
prog,
status);
send_http_error(conn,
500,
"Error: Cannot spawn CGI process [%s]: %s",
prog,
status);
goto done;
}
/* Make sure child closes all pipe descriptors. It must dup them to 0,1 */
set_close_on_exec((SOCKET)fdin[0], conn);
set_close_on_exec((SOCKET)fdin[1], conn);
set_close_on_exec((SOCKET)fdout[0], conn);
set_close_on_exec((SOCKET)fdout[1], conn);
set_close_on_exec((SOCKET)fderr[0], conn);
set_close_on_exec((SOCKET)fderr[1], conn);
/* Parent closes only one side of the pipes.
* If we don't mark them as closed, close() attempt before
* return from this function throws an exception on Windows.
* Windows does not like when closed descriptor is closed again. */
(void)close(fdin[0]);
(void)close(fdout[1]);
(void)close(fderr[1]);
fdin[0] = fdout[1] = fderr[1] = -1;
if ((in = fdopen(fdin[1], "wb")) == NULL) {
status = strerror(ERRNO);
mg_cry(conn,
"Error: CGI program \"%s\": Can not open stdin: %s",
prog,
status);
send_http_error(conn,
500,
"Error: CGI can not open fdin\nfopen: %s",
status);
goto done;
}
if ((out = fdopen(fdout[0], "rb")) == NULL) {
status = strerror(ERRNO);
mg_cry(conn,
"Error: CGI program \"%s\": Can not open stdout: %s",
prog,
status);
send_http_error(conn,
500,
"Error: CGI can not open fdout\nfopen: %s",
status);
goto done;
}
if ((err = fdopen(fderr[0], "rb")) == NULL) {
status = strerror(ERRNO);
mg_cry(conn,
"Error: CGI program \"%s\": Can not open stderr: %s",
prog,
status);
send_http_error(conn,
500,
"Error: CGI can not open fdout\nfopen: %s",
status);
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
setbuf(err, NULL);
fout.fp = out;
if ((conn->request_info.content_length > 0) || conn->is_chunked) {
/* This is a POST/PUT request, or another request with body data. */
if (!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
/* Error sending the body data */
mg_cry(conn,
"Error: CGI program \"%s\": Forward body data failed",
prog);
goto done;
}
}
/* Close so child gets an EOF. */
fclose(in);
in = NULL;
fdin[1] = -1;
/* Now read CGI reply into a buffer. We need to set correct
* status code, thus we need to see all HTTP headers first.
* Do not send anything back to client, until we buffer in all
* HTTP headers. */
data_len = 0;
buf = (char *)mg_malloc(buflen);
if (buf == NULL) {
send_http_error(conn,
500,
"Error: Not enough memory for CGI buffer (%u bytes)",
(unsigned int)buflen);
mg_cry(conn,
"Error: CGI program \"%s\": Not enough memory for buffer (%u "
"bytes)",
prog,
(unsigned int)buflen);
goto done;
}
headers_len = read_request(out, conn, buf, (int)buflen, &data_len);
if (headers_len <= 0) {
/* Could not parse the CGI response. Check if some error message on
* stderr. */
i = pull_all(err, conn, buf, (int)buflen);
if (i > 0) {
mg_cry(conn,
"Error: CGI program \"%s\" sent error "
"message: [%.*s]",
prog,
i,
buf);
send_http_error(conn,
500,
"Error: CGI program \"%s\" sent error "
"message: [%.*s]",
prog,
i,
buf);
}
else {
mg_cry(conn,
"Error: CGI program sent malformed or too big "
"(>%u bytes) HTTP headers: [%.*s]",
(unsigned)buflen,
data_len,
buf);
send_http_error(conn,
500,
"Error: CGI program sent malformed or too big "
"(>%u bytes) HTTP headers: [%.*s]",
(unsigned)buflen,
data_len,
buf);
}
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
/* Make up and send the status line */
status_text = "OK";
if ((status = get_header(&ri, "Status")) != NULL) {
conn->status_code = atoi(status);
status_text = status;
while (isdigit(*(unsigned char *)status_text) || *status_text == ' ') {
status_text++;
}
}
else if (get_header(&ri, "Location") != NULL) {
conn->status_code = 302;
}
else {
conn->status_code = 200;
}
connection_state = get_header(&ri, "Connection");
if (connection_state == NULL
|| mg_strcasecmp(connection_state, "keep-alive")) {
conn->must_close = 1;
}
(void)mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code, status_text);
/* Send headers */
for (i = 0; i < ri.num_headers; i++) {
mg_printf(conn,
"%s: %s\r\n",
ri.http_headers[i].name,
ri.http_headers[i].value);
}
mg_write(conn, "\r\n", 2);
/* Send chunk of data that may have been read after the headers */
conn->num_bytes_sent +=
mg_write(conn, buf + headers_len, (size_t)(data_len - headers_len));
/* Read the rest of CGI output and send to the client */
send_file_data(conn, &fout, 0, INT64_MAX);
done:
mg_free(blk.var);
mg_free(blk.buf);
if (pid != (pid_t)-1) {
kill(pid, SIGKILL);
#if !defined(_WIN32)
{
int st;
while (waitpid(pid, &st, 0) != -1)
; /* clean zombies */
}
#endif
}
if (fdin[0] != -1) {
close(fdin[0]);
}
if (fdout[1] != -1) {
close(fdout[1]);
}
if (in != NULL) {
fclose(in);
}
else if (fdin[1] != -1) {
close(fdin[1]);
}
if (out != NULL) {
fclose(out);
}
else if (fdout[0] != -1) {
close(fdout[0]);
}
if (err != NULL) {
fclose(err);
}
else if (fderr[0] != -1) {
close(fderr[0]);
}
if (buf != NULL) {
mg_free(buf);
}
}
#endif /* !NO_CGI */
#if !defined(NO_FILES)
static void
mkcol(struct mg_connection *conn, const char *path)
{
int rc, body_len;
struct de de;
char date[64];
time_t curtime = time(NULL);
if (conn == NULL) {
return;
}
/* TODO (mid): Check the send_http_error situations in this function */
memset(&de.file, 0, sizeof(de.file));
if (!mg_stat(conn, path, &de.file)) {
mg_cry(conn,
"%s: mg_stat(%s) failed: %s",
__func__,
path,
strerror(ERRNO));
}
if (de.file.last_modified) {
/* TODO (high): This check does not seem to make any sense ! */
send_http_error(
conn, 405, "Error: mkcol(%s): %s", path, strerror(ERRNO));
return;
}
body_len = conn->data_len - conn->request_len;
if (body_len > 0) {
send_http_error(
conn, 415, "Error: mkcol(%s): %s", path, strerror(ERRNO));
return;
}
rc = mg_mkdir(path, 0755);
if (rc == 0) {
conn->status_code = 201;
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn,
"HTTP/1.1 %d Created\r\n"
"Date: %s\r\n",
conn->status_code,
date);
send_static_cache_header(conn);
mg_printf(conn,
"Content-Length: 0\r\n"
"Connection: %s\r\n\r\n",
suggest_connection_header(conn));
}
else if (rc == -1) {
if (errno == EEXIST) {
send_http_error(
conn, 405, "Error: mkcol(%s): %s", path, strerror(ERRNO));
}
else if (errno == EACCES) {
send_http_error(
conn, 403, "Error: mkcol(%s): %s", path, strerror(ERRNO));
}
else if (errno == ENOENT) {
send_http_error(
conn, 409, "Error: mkcol(%s): %s", path, strerror(ERRNO));
}
else {
send_http_error(conn, 500, "fopen(%s): %s", path, strerror(ERRNO));
}
}
}
static void
put_file(struct mg_connection *conn, const char *path)
{
struct file file = STRUCT_FILE_INITIALIZER;
const char *range;
int64_t r1, r2;
int rc;
char date[64];
time_t curtime = time(NULL);
if (conn == NULL) {
return;
}
if (mg_stat(conn, path, &file)) {
/* File already exists */
conn->status_code = 200;
if (file.is_directory) {
/* This is an already existing directory,
* so there is nothing to do for the server. */
rc = 0;
}
else {
/* File exists and is not a directory. */
/* Can it be replaced? */
if (file.membuf != NULL) {
/* This is an "in-memory" file, that can not be replaced */
send_http_error(
conn,
405,
"Error: Put not possible\nReplacing %s is not supported",
path);
return;
}
/* Check if the server may write this file */
if (access(path, W_OK) == 0) {
/* Access granted */
conn->status_code = 200;
rc = 1;
}
else {
send_http_error(
conn,
403,
"Error: Put not possible\nReplacing %s is not allowed",
path);
return;
}
}
}
else {
/* File should be created */
conn->status_code = 201;
rc = put_dir(conn, path);
}
if (rc == 0) {
/* put_dir returns 0 if path is a directory */
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn,
"HTTP/1.1 %d %s\r\n",
conn->status_code,
mg_get_response_code_text(conn->status_code, NULL));
send_no_cache_header(conn);
mg_printf(conn,
"Date: %s\r\n"
"Content-Length: 0\r\n"
"Connection: %s\r\n\r\n",
date,
suggest_connection_header(conn));
/* Request to create a directory has been fulfilled successfully.
* No need to put a file. */
return;
}
if (rc == -1) {
/* put_dir returns -1 if the path is too long */
send_http_error(conn,
414,
"Error: Path too long\nput_dir(%s): %s",
path,
strerror(ERRNO));
return;
}
if (rc == -2) {
/* put_dir returns -2 if the directory can not be created */
send_http_error(conn,
500,
"Error: Can not create directory\nput_dir(%s): %s",
path,
strerror(ERRNO));
return;
}
/* A file should be created or overwritten. */
if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
mg_fclose(&file);
send_http_error(conn,
500,
"Error: Can not create file\nfopen(%s): %s",
path,
strerror(ERRNO));
return;
}
fclose_on_exec(&file, conn);
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->status_code = 206; /* Partial content */
fseeko(file.fp, r1, SEEK_SET);
}
if (!forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
/* forward_body_data failed.
* The error code has already been sent to the client,
* and conn->status_code is already set. */
mg_fclose(&file);
return;
}
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn,
"HTTP/1.1 %d %s\r\n",
conn->status_code,
mg_get_response_code_text(conn->status_code, NULL));
send_no_cache_header(conn);
mg_printf(conn,
"Date: %s\r\n"
"Content-Length: 0\r\n"
"Connection: %s\r\n\r\n",
date,
suggest_connection_header(conn));
mg_fclose(&file);
}
static void
delete_file(struct mg_connection *conn, const char *path)
{
struct de de;
memset(&de.file, 0, sizeof(de.file));
if (!mg_stat(conn, path, &de.file)) {
/* mg_stat returns 0 if the file does not exist */
send_http_error(conn,
404,
"Error: Cannot delete file\nFile %s not found",
path);
return;
}
if (de.file.membuf != NULL) {
/* the file is cached in memory */
send_http_error(
conn,
405,
"Error: Delete not possible\nDeleting %s is not supported",
path);
return;
}
if (de.file.is_directory) {
if (remove_directory(conn, path)) {
/* Delete is successful: Return 204 without content. */
send_http_error(conn, 204, "%s", "");
}
else {
/* Delete is not successful: Return 500 (Server error). */
send_http_error(conn, 500, "Error: Could not delete %s", path);
}
return;
}
/* This is an existing file (not a directory).
* Check if write permission is granted. */
if (access(path, W_OK) != 0) {
/* File is read only */
send_http_error(
conn,
403,
"Error: Delete not possible\nDeleting %s is not allowed",
path);
return;
}
/* Try to delete it. */
if (mg_remove(path) == 0) {
/* Delete was successful: Return 204 without content. */
send_http_error(conn, 204, "%s", "");
}
else {
/* Delete not successful (file locked). */
send_http_error(conn,
423,
"Error: Cannot delete file\nremove(%s): %s",
path,
strerror(ERRNO));
}
}
#endif /* !NO_FILES */
static void
send_ssi_file(struct mg_connection *, const char *, struct file *, int);
static void
do_ssi_include(struct mg_connection *conn,
const char *ssi,
char *tag,
int include_level)
{
char file_name[MG_BUF_LEN], path[512], *p;
struct file file = STRUCT_FILE_INITIALIZER;
size_t len;
int truncated = 0;
if (conn == NULL) {
return;
}
/* sscanf() is safe here, since send_ssi_file() also uses buffer
* of size MG_BUF_LEN to get the tag. So strlen(tag) is
* always < MG_BUF_LEN. */
if (sscanf(tag, " virtual=\"%511[^\"]\"", file_name) == 1) {
/* File name is relative to the webserver root */
file_name[511] = 0;
(void)mg_snprintf(conn,
&truncated,
path,
sizeof(path),
"%s/%s",
conn->ctx->config[DOCUMENT_ROOT],
file_name);
}
else if (sscanf(tag, " abspath=\"%511[^\"]\"", file_name) == 1) {
/* File name is relative to the webserver working directory
* or it is absolute system path */
file_name[511] = 0;
(void)
mg_snprintf(conn, &truncated, path, sizeof(path), "%s", file_name);
}
else if (sscanf(tag, " file=\"%511[^\"]\"", file_name) == 1
|| sscanf(tag, " \"%511[^\"]\"", file_name) == 1) {
/* File name is relative to the currect document */
file_name[511] = 0;
(void)mg_snprintf(conn, &truncated, path, sizeof(path), "%s", ssi);
if (!truncated) {
if ((p = strrchr(path, '/')) != NULL) {
p[1] = '\0';
}
len = strlen(path);
(void)mg_snprintf(conn,
&truncated,
path + len,
sizeof(path) - len,
"%s",
file_name);
}
}
else {
mg_cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if (truncated) {
mg_cry(conn, "SSI #include path length overflow: [%s]", tag);
return;
}
if (!mg_fopen(conn, path, "rb", &file)) {
mg_cry(conn,
"Cannot open SSI #include: [%s]: fopen(%s): %s",
tag,
path,
strerror(ERRNO));
}
else {
fclose_on_exec(&file, conn);
if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]),
path) > 0) {
send_ssi_file(conn, path, &file, include_level + 1);
}
else {
send_file_data(conn, &file, 0, INT64_MAX);
}
mg_fclose(&file);
}
}
#if !defined(NO_POPEN)
static void
do_ssi_exec(struct mg_connection *conn, char *tag)
{
char cmd[1024] = "";
struct file file = STRUCT_FILE_INITIALIZER;
if (sscanf(tag, " \"%1023[^\"]\"", cmd) != 1) {
mg_cry(conn, "Bad SSI #exec: [%s]", tag);
}
else {
cmd[1023] = 0;
if ((file.fp = popen(cmd, "r")) == NULL) {
mg_cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
}
else {
send_file_data(conn, &file, 0, INT64_MAX);
pclose(file.fp);
}
}
}
#endif /* !NO_POPEN */
static int
mg_fgetc(struct file *filep, int offset)
{
if (filep == NULL) {
return EOF;
}
if (filep->membuf != NULL && offset >= 0
&& ((unsigned int)(offset)) < filep->size) {
return ((unsigned char *)filep->membuf)[offset];
}
else if (filep->fp != NULL) {
return fgetc(filep->fp);
}
else {
return EOF;
}
}
static void
send_ssi_file(struct mg_connection *conn,
const char *path,
struct file *filep,
int include_level)
{
char buf[MG_BUF_LEN];
int ch, offset, len, in_ssi_tag;
if (include_level > 10) {
mg_cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = len = offset = 0;
while ((ch = mg_fgetc(filep, offset)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = 0;
buf[len++] = (char)ch;
buf[len] = '\0';
/* assert(len <= (int) sizeof(buf)); */
if (len > (int)sizeof(buf)) {
break;
}
if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
/* Not an SSI tag, pass it */
(void)mg_write(conn, buf, (size_t)len);
}
else {
if (!memcmp(buf + 5, "include", 7)) {
do_ssi_include(conn, path, buf + 12, include_level);
#if !defined(NO_POPEN)
}
else if (!memcmp(buf + 5, "exec", 4)) {
do_ssi_exec(conn, buf + 9);
#endif /* !NO_POPEN */
}
else {
mg_cry(conn,
"%s: unknown SSI "
"command: \"%s\"",
path,
buf);
}
}
len = 0;
}
else if (in_ssi_tag) {
if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
/* Not an SSI tag */
in_ssi_tag = 0;
}
else if (len == (int)sizeof(buf) - 2) {
mg_cry(conn, "%s: SSI tag is too large", path);
len = 0;
}
buf[len++] = (char)(ch & 0xff);
}
else if (ch == '<') {
in_ssi_tag = 1;
if (len > 0) {
mg_write(conn, buf, (size_t)len);
}
len = 0;
buf[len++] = (char)(ch & 0xff);
}
else {
buf[len++] = (char)(ch & 0xff);
if (len == (int)sizeof(buf)) {
mg_write(conn, buf, (size_t)len);
len = 0;
}
}
}
/* Send the rest of buffered data */
if (len > 0) {
mg_write(conn, buf, (size_t)len);
}
}
static void
handle_ssi_file_request(struct mg_connection *conn,
const char *path,
struct file *filep)
{
char date[64];
time_t curtime = time(NULL);
const char *cors1, *cors2, *cors3;
if (conn == NULL || path == NULL || filep == NULL) {
return;
}
if (mg_get_header(conn, "Origin")) {
/* Cross-origin resource sharing (CORS). */
cors1 = "Access-Control-Allow-Origin: ";
cors2 = conn->ctx->config[ACCESS_CONTROL_ALLOW_ORIGIN];
cors3 = "\r\n";
}
else {
cors1 = cors2 = cors3 = "";
}
if (!mg_fopen(conn, path, "rb", filep)) {
/* File exists (precondition for calling this function),
* but can not be opened by the server. */
send_http_error(conn,
500,
"Error: Cannot read file\nfopen(%s): %s",
path,
strerror(ERRNO));
}
else {
conn->must_close = 1;
gmt_time_string(date, sizeof(date), &curtime);
fclose_on_exec(filep, conn);
mg_printf(conn, "HTTP/1.1 200 OK\r\n");
send_no_cache_header(conn);
mg_printf(conn,
"%s%s%s"
"Date: %s\r\n"
"Content-Type: text/html\r\n"
"Connection: %s\r\n\r\n",
cors1,
cors2,
cors3,
date,
suggest_connection_header(conn));
send_ssi_file(conn, path, filep, 0);
mg_fclose(filep);
}
}
#if !defined(NO_FILES)
static void
send_options(struct mg_connection *conn)
{
char date[64];
time_t curtime = time(NULL);
if (!conn) {
return;
}
conn->status_code = 200;
conn->must_close = 1;
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn,
"HTTP/1.1 200 OK\r\n"
"Date: %s\r\n"
/* TODO: "Cache-Control" (?) */
"Connection: %s\r\n"
"Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS, "
"PROPFIND, MKCOL\r\n"
"DAV: 1\r\n\r\n",
date,
suggest_connection_header(conn));
}
/* Writes PROPFIND properties for a collection element */
static void
print_props(struct mg_connection *conn, const char *uri, struct file *filep)
{
char mtime[64];
if (conn == NULL || uri == NULL || filep == NULL) {
return;
}
gmt_time_string(mtime, sizeof(mtime), &filep->last_modified);
conn->num_bytes_sent +=
mg_printf(conn,
"<d:response>"
"<d:href>%s</d:href>"
"<d:propstat>"
"<d:prop>"
"<d:resourcetype>%s</d:resourcetype>"
"<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
"<d:getlastmodified>%s</d:getlastmodified>"
"</d:prop>"
"<d:status>HTTP/1.1 200 OK</d:status>"
"</d:propstat>"
"</d:response>\n",
uri,
filep->is_directory ? "<d:collection/>" : "",
filep->size,
mtime);
}
static void
print_dav_dir_entry(struct de *de, void *data)
{
char href[PATH_MAX];
char href_encoded[PATH_MAX];
int truncated;
struct mg_connection *conn = (struct mg_connection *)data;
if (!de || !conn) {
return;
}
mg_snprintf(conn,
&truncated,
href,
sizeof(href),
"%s%s",
conn->request_info.local_uri,
de->file_name);
if (!truncated) {
mg_url_encode(href, href_encoded, PATH_MAX - 1);
print_props(conn, href_encoded, &de->file);
}
}
static void
handle_propfind(struct mg_connection *conn,
const char *path,
struct file *filep)
{
const char *depth = mg_get_header(conn, "Depth");
char date[64];
time_t curtime = time(NULL);
gmt_time_string(date, sizeof(date), &curtime);
if (!conn || !path || !filep || !conn->ctx) {
return;
}
conn->must_close = 1;
conn->status_code = 207;
mg_printf(conn,
"HTTP/1.1 207 Multi-Status\r\n"
"Date: %s\r\n",
date);
send_static_cache_header(conn);
mg_printf(conn,
"Connection: %s\r\n"
"Content-Type: text/xml; charset=utf-8\r\n\r\n",
suggest_connection_header(conn));
conn->num_bytes_sent +=
mg_printf(conn,
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<d:multistatus xmlns:d='DAV:'>\n");
/* Print properties for the requested resource itself */
print_props(conn, conn->request_info.local_uri, filep);
/* If it is a directory, print directory entries too if Depth is not 0 */
if (filep && filep->is_directory
&& !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")
&& (depth == NULL || strcmp(depth, "0") != 0)) {
scan_directory(conn, path, conn, &print_dav_dir_entry);
}
conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
}
#endif
void
mg_lock_connection(struct mg_connection *conn)
{
if (conn) {
(void)pthread_mutex_lock(&conn->mutex);
}
}
void
mg_unlock_connection(struct mg_connection *conn)
{
if (conn) {
(void)pthread_mutex_unlock(&conn->mutex);
}
}
void
mg_lock_context(struct mg_context *ctx)
{
if (ctx) {
(void)pthread_mutex_lock(&ctx->nonce_mutex);
}
}
void
mg_unlock_context(struct mg_context *ctx)
{
if (ctx) {
(void)pthread_mutex_unlock(&ctx->nonce_mutex);
}
}
#if defined(USE_TIMERS)
#include "timer.inl"
#endif /* USE_TIMERS */
#ifdef USE_LUA
#include "mod_lua.inl"
#endif /* USE_LUA */
#ifdef USE_DUKTAPE
#include "mod_duktape.inl"
#endif /* USE_DUKTAPE */
#if defined(USE_WEBSOCKET)
/* START OF SHA-1 code
* Copyright(c) By Steve Reid <steve@edmweb.com> */
#define SHA1HANDSOFF
/* According to current tests (May 2015), the <solarisfixes.h> is not required.
*
* #if defined(__sun)
* #include "solarisfixes.h"
* #endif
*/
static int
is_big_endian(void)
{
static const int n = 1;
return ((char *)&n)[0] == 0;
}
union char64long16 {
unsigned char c[64];
uint32_t l[16];
};
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
static uint32_t
blk0(union char64long16 *block, int i)
{
/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
if (!is_big_endian()) {
block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00)
| (rol(block->l[i], 8) & 0x00FF00FF);
}
return block->l[i];
}
#define blk(i) \
(block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] \
^ block->l[(i + 2) & 15] ^ block->l[i & 15], \
1))
#define R0(v, w, x, y, z, i) \
z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
w = rol(w, 30);
#define R1(v, w, x, y, z, i) \
z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
w = rol(w, 30);
#define R2(v, w, x, y, z, i) \
z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
w = rol(w, 30);
#define R3(v, w, x, y, z, i) \
z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
w = rol(w, 30);
#define R4(v, w, x, y, z, i) \
z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
w = rol(w, 30);
typedef struct {
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
static void
SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
{
uint32_t a, b, c, d, e;
union char64long16 block[1];
memcpy(block, buffer, 64);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
R0(a, b, c, d, e, 0);
R0(e, a, b, c, d, 1);
R0(d, e, a, b, c, 2);
R0(c, d, e, a, b, 3);
R0(b, c, d, e, a, 4);
R0(a, b, c, d, e, 5);
R0(e, a, b, c, d, 6);
R0(d, e, a, b, c, 7);
R0(c, d, e, a, b, 8);
R0(b, c, d, e, a, 9);
R0(a, b, c, d, e, 10);
R0(e, a, b, c, d, 11);
R0(d, e, a, b, c, 12);
R0(c, d, e, a, b, 13);
R0(b, c, d, e, a, 14);
R0(a, b, c, d, e, 15);
R1(e, a, b, c, d, 16);
R1(d, e, a, b, c, 17);
R1(c, d, e, a, b, 18);
R1(b, c, d, e, a, 19);
R2(a, b, c, d, e, 20);
R2(e, a, b, c, d, 21);
R2(d, e, a, b, c, 22);
R2(c, d, e, a, b, 23);
R2(b, c, d, e, a, 24);
R2(a, b, c, d, e, 25);
R2(e, a, b, c, d, 26);
R2(d, e, a, b, c, 27);
R2(c, d, e, a, b, 28);
R2(b, c, d, e, a, 29);
R2(a, b, c, d, e, 30);
R2(e, a, b, c, d, 31);
R2(d, e, a, b, c, 32);
R2(c, d, e, a, b, 33);
R2(b, c, d, e, a, 34);
R2(a, b, c, d, e, 35);
R2(e, a, b, c, d, 36);
R2(d, e, a, b, c, 37);
R2(c, d, e, a, b, 38);
R2(b, c, d, e, a, 39);
R3(a, b, c, d, e, 40);
R3(e, a, b, c, d, 41);
R3(d, e, a, b, c, 42);
R3(c, d, e, a, b, 43);
R3(b, c, d, e, a, 44);
R3(a, b, c, d, e, 45);
R3(e, a, b, c, d, 46);
R3(d, e, a, b, c, 47);
R3(c, d, e, a, b, 48);
R3(b, c, d, e, a, 49);
R3(a, b, c, d, e, 50);
R3(e, a, b, c, d, 51);
R3(d, e, a, b, c, 52);
R3(c, d, e, a, b, 53);
R3(b, c, d, e, a, 54);
R3(a, b, c, d, e, 55);
R3(e, a, b, c, d, 56);
R3(d, e, a, b, c, 57);
R3(c, d, e, a, b, 58);
R3(b, c, d, e, a, 59);
R4(a, b, c, d, e, 60);
R4(e, a, b, c, d, 61);
R4(d, e, a, b, c, 62);
R4(c, d, e, a, b, 63);
R4(b, c, d, e, a, 64);
R4(a, b, c, d, e, 65);
R4(e, a, b, c, d, 66);
R4(d, e, a, b, c, 67);
R4(c, d, e, a, b, 68);
R4(b, c, d, e, a, 69);
R4(a, b, c, d, e, 70);
R4(e, a, b, c, d, 71);
R4(d, e, a, b, c, 72);
R4(c, d, e, a, b, 73);
R4(b, c, d, e, a, 74);
R4(a, b, c, d, e, 75);
R4(e, a, b, c, d, 76);
R4(d, e, a, b, c, 77);
R4(c, d, e, a, b, 78);
R4(b, c, d, e, a, 79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
a = b = c = d = e = 0;
memset(block, '\0', sizeof(block));
}
static void
SHA1Init(SHA1_CTX *context)
{
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->count[0] = context->count[1] = 0;
}
static void
SHA1Update(SHA1_CTX *context, const unsigned char *data, uint32_t len)
{
uint32_t i, j;
j = context->count[0];
if ((context->count[0] += len << 3) < j) {
context->count[1]++;
}
context->count[1] += (len >> 29);
j = (j >> 3) & 63;
if ((j + len) > 63) {
memcpy(&context->buffer[j], data, (i = 64 - j));
SHA1Transform(context->state, context->buffer);
for (; i + 63 < len; i += 64) {
SHA1Transform(context->state, &data[i]);
}
j = 0;
}
else
i = 0;
memcpy(&context->buffer[j], &data[i], len - i);
}
static void
SHA1Final(unsigned char digest[20], SHA1_CTX *context)
{
unsigned i;
unsigned char finalcount[8], c;
for (i = 0; i < 8; i++) {
finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
>> ((3 - (i & 3)) * 8)) & 255);
}
c = 0200;
SHA1Update(context, &c, 1);
while ((context->count[0] & 504) != 448) {
c = 0000;
SHA1Update(context, &c, 1);
}
SHA1Update(context, finalcount, 8);
for (i = 0; i < 20; i++) {
digest[i] = (unsigned char)((context->state[i >> 2]
>> ((3 - (i & 3)) * 8)) & 255);
}
memset(context, '\0', sizeof(*context));
memset(&finalcount, '\0', sizeof(finalcount));
}
/* END OF SHA1 CODE */
static int
send_websocket_handshake(struct mg_connection *conn, const char *websock_key)
{
static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
const char *protocol = NULL;
char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
SHA1_CTX sha_ctx;
int truncated;
/* Calculate Sec-WebSocket-Accept reply from Sec-WebSocket-Key. */
mg_snprintf(conn, &truncated, buf, sizeof(buf), "%s%s", websock_key, magic);
if (truncated) {
conn->must_close = 1;
return 0;
}
SHA1Init(&sha_ctx);
SHA1Update(&sha_ctx, (unsigned char *)buf, (uint32_t)strlen(buf));
SHA1Final((unsigned char *)sha, &sha_ctx);
base64_encode((unsigned char *)sha, sizeof(sha), b64_sha);
mg_printf(conn,
"HTTP/1.1 101 Switching Protocols\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Accept: %s\r\n",
b64_sha);
protocol = mg_get_header(conn, "Sec-WebSocket-Protocol");
if (protocol) {
mg_printf(conn, "Sec-WebSocket-Protocol: %s\r\n\r\n", protocol);
}
else {
mg_printf(conn, "%s", "\r\n");
}
return 1;
}
static void
read_websocket(struct mg_connection *conn,
mg_websocket_data_handler ws_data_handler,
void *callback_data)
{
/* Pointer to the beginning of the portion of the incoming websocket
* message queue.
* The original websocket upgrade request is never removed, so the queue
* begins after it. */
unsigned char *buf = (unsigned char *)conn->buf + conn->request_len;
int n, error, exit_by_callback;
/* body_len is the length of the entire queue in bytes
* len is the length of the current message
* data_len is the length of the current message's data payload
* header_len is the length of the current message's header */
size_t i, len, mask_len = 0, data_len = 0, header_len, body_len;
/* "The masking key is a 32-bit value chosen at random by the client."
* http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17#section-5
*/
unsigned char mask[4];
/* data points to the place where the message is stored when passed to the
* websocket_data callback. This is either mem on the stack, or a
* dynamically allocated buffer if it is too large. */
char mem[4096];
char *data = mem;
unsigned char mop; /* mask flag and opcode */
double timeout = -1.0;
if (conn->ctx->config[WEBSOCKET_TIMEOUT]) {
timeout = atoi(conn->ctx->config[WEBSOCKET_TIMEOUT]) / 1000.0;
}
if ((timeout <= 0.0) && (conn->ctx->config[REQUEST_TIMEOUT])) {
timeout = atoi(conn->ctx->config[REQUEST_TIMEOUT]) / 1000.0;
}
mg_set_thread_name("wsock");
/* Loop continuously, reading messages from the socket, invoking the
* callback, and waiting repeatedly until an error occurs. */
while (!conn->ctx->stop_flag) {
header_len = 0;
assert(conn->data_len >= conn->request_len);
if ((body_len = (size_t)(conn->data_len - conn->request_len)) >= 2) {
len = buf[1] & 127;
mask_len = buf[1] & 128 ? 4 : 0;
if (len < 126 && body_len >= mask_len) {
data_len = len;
header_len = 2 + mask_len;
}
else if (len == 126 && body_len >= 4 + mask_len) {
header_len = 4 + mask_len;
data_len = ((((size_t)buf[2]) << 8) + buf[3]);
}
else if (body_len >= 10 + mask_len) {
header_len = 10 + mask_len;
data_len = (((uint64_t)ntohl(*(uint32_t *)(void *)&buf[2]))
<< 32) + ntohl(*(uint32_t *)(void *)&buf[6]);
}
}
if (header_len > 0 && body_len >= header_len) {
/* Allocate space to hold websocket payload */
data = mem;
if (data_len > sizeof(mem)) {
data = (char *)mg_malloc(data_len);
if (data == NULL) {
/* Allocation failed, exit the loop and then close the
* connection */
mg_cry(conn, "websocket out of memory; closing connection");
break;
}
}
/* Copy the mask before we shift the queue and destroy it */
if (mask_len > 0) {
memcpy(mask, buf + header_len - mask_len, sizeof(mask));
}
else {
memset(mask, 0, sizeof(mask));
}
/* Read frame payload from the first message in the queue into
* data and advance the queue by moving the memory in place. */
assert(body_len >= header_len);
if (data_len + header_len > body_len) {
mop = buf[0]; /* current mask and opcode */
/* Overflow case */
len = body_len - header_len;
memcpy(data, buf + header_len, len);
error = 0;
while (len < data_len) {
n = pull(
NULL, conn, data + len, (int)(data_len - len), timeout);
if (n <= 0) {
error = 1;
break;
}
len += (size_t)n;
}
if (error) {
mg_cry(conn, "Websocket pull failed; closing connection");
break;
}
conn->data_len = conn->request_len;
}
else {
mop = buf[0]; /* current mask and opcode, overwritten by
* memmove() */
/* Length of the message being read at the front of the
* queue */
len = data_len + header_len;
/* Copy the data payload into the data pointer for the
* callback */
memcpy(data, buf + header_len, data_len);
/* Move the queue forward len bytes */
memmove(buf, buf + len, body_len - len);
/* Mark the queue as advanced */
conn->data_len -= (int)len;
}
/* Apply mask if necessary */
if (mask_len > 0) {
for (i = 0; i < data_len; ++i) {
data[i] ^= mask[i & 3];
}
}
/* Exit the loop if callback signals to exit (server side),
* or "connection close" opcode received (client side). */
exit_by_callback = 0;
if ((ws_data_handler != NULL)
&& !ws_data_handler(conn, mop, data, data_len, callback_data)) {
exit_by_callback = 1;
}
if (data != mem) {
mg_free(data);
}
if (exit_by_callback
|| ((mop & 0xf) == WEBSOCKET_OPCODE_CONNECTION_CLOSE)) {
/* Opcode == 8, connection close */
break;
}
/* Not breaking the loop, process next websocket frame. */
}
else {
/* Read from the socket into the next available location in the
* message queue. */
if ((n = pull(NULL,
conn,
conn->buf + conn->data_len,
conn->buf_size - conn->data_len,
timeout)) <= 0) {
/* Error, no bytes read */
break;
}
conn->data_len += n;
}
}
mg_set_thread_name("worker");
}
static int
mg_websocket_write_exec(struct mg_connection *conn,
int opcode,
const char *data,
size_t dataLen,
uint32_t masking_key)
{
unsigned char header[14];
size_t headerLen = 1;
int retval = -1;
header[0] = 0x80 + (opcode & 0xF);
/* Frame format: http://tools.ietf.org/html/rfc6455#section-5.2 */
if (dataLen < 126) {
/* inline 7-bit length field */
header[1] = (unsigned char)dataLen;
headerLen = 2;
}
else if (dataLen <= 0xFFFF) {
/* 16-bit length field */
header[1] = 126;
*(uint16_t *)(void *)(header + 2) = htons((uint16_t)dataLen);
headerLen = 4;
}
else {
/* 64-bit length field */
header[1] = 127;
*(uint32_t *)(void *)(header + 2) = htonl((uint64_t)dataLen >> 32);
*(uint32_t *)(void *)(header + 6) = htonl(dataLen & 0xFFFFFFFF);
headerLen = 10;
}
if (masking_key) {
/* add mask */
header[1] |= 0x80;
*(uint32_t *)(void *)(header + headerLen) = masking_key;
headerLen += 4;
}
/* Note that POSIX/Winsock's send() is threadsafe
* http://stackoverflow.com/questions/1981372/are-parallel-calls-to-send-recv-on-the-same-socket-valid
* but mongoose's mg_printf/mg_write is not (because of the loop in
* push(), although that is only a problem if the packet is large or
* outgoing buffer is full). */
(void)mg_lock_connection(conn);
retval = mg_write(conn, header, headerLen);
if (dataLen > 0) {
retval = mg_write(conn, data, dataLen);
}
mg_unlock_connection(conn);
return retval;
}
int
mg_websocket_write(struct mg_connection *conn,
int opcode,
const char *data,
size_t dataLen)
{
return mg_websocket_write_exec(conn, opcode, data, dataLen, 0);
}
static void
mask_data(const char *in, size_t in_len, uint32_t masking_key, char *out)
{
size_t i = 0;
i = 0;
if ((in_len > 3) && ((ptrdiff_t)in % 4) == 0) {
/* Convert in 32 bit words, if data is 4 byte aligned */
while (i < (in_len - 3)) {
*(uint32_t *)(void *)(out + i) =
*(uint32_t *)(void *)(in + i) ^ masking_key;
i += 4;
}
}
if (i != in_len) {
/* convert 1-3 remaining bytes if ((dataLen % 4) != 0)*/
while (i < in_len) {
*(uint8_t *)(void *)(out + i) =
*(uint8_t *)(void *)(in + i)
^ *(((uint8_t *)&masking_key) + (i % 4));
i++;
}
}
}
int
mg_websocket_client_write(struct mg_connection *conn,
int opcode,
const char *data,
size_t dataLen)
{
int retval = -1;
char *masked_data = (char *)mg_malloc(((dataLen + 7) / 4) * 4);
uint32_t masking_key = (uint32_t)get_random();
if (masked_data == NULL) {
/* Return -1 in an error case */
mg_cry(conn,
"Cannot allocate buffer for masked websocket response: "
"Out of memory");
return -1;
}
mask_data(data, dataLen, masking_key, masked_data);
retval = mg_websocket_write_exec(
conn, opcode, masked_data, dataLen, masking_key);
mg_free(masked_data);
return retval;
}
static void
handle_websocket_request(struct mg_connection *conn,
const char *path,
int is_callback_resource,
mg_websocket_connect_handler ws_connect_handler,
mg_websocket_ready_handler ws_ready_handler,
mg_websocket_data_handler ws_data_handler,
mg_websocket_close_handler ws_close_handler,
void *cbData)
{
const char *websock_key = mg_get_header(conn, "Sec-WebSocket-Key");
const char *version = mg_get_header(conn, "Sec-WebSocket-Version");
int lua_websock = 0;
#if !defined(USE_LUA)
(void)path;
#endif
/* Step 1: Check websocket protocol version. */
/* Step 1.1: Check Sec-WebSocket-Key. */
if (!websock_key) {
/* The RFC standard version (https://tools.ietf.org/html/rfc6455)
* requires a Sec-WebSocket-Key header.
*/
/* It could be the hixie draft version
* (http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76).
*/
const char *key1 = mg_get_header(conn, "Sec-WebSocket-Key1");
const char *key2 = mg_get_header(conn, "Sec-WebSocket-Key2");
char key3[8];
if ((key1 != NULL) && (key2 != NULL)) {
/* This version uses 8 byte body data in a GET request */
conn->content_len = 8;
if (8 == mg_read(conn, key3, 8)) {
/* This is the hixie version */
send_http_error(conn,
426,
"%s",
"Protocol upgrade to RFC 6455 required");
return;
}
}
/* This is an unknown version */
send_http_error(conn, 400, "%s", "Malformed websocket request");
return;
}
/* Step 1.2: Check websocket protocol version. */
/* The RFC version (https://tools.ietf.org/html/rfc6455) is 13. */
if (version == NULL || strcmp(version, "13") != 0) {
/* Reject wrong versions */
send_http_error(conn, 426, "%s", "Protocol upgrade required");
return;
}
/* Step 1.3: Could check for "Host", but we do not really nead this
* value for anything, so just ignore it. */
/* Step 2: If a callback is responsible, call it. */
if (is_callback_resource) {
if (ws_connect_handler != NULL
&& ws_connect_handler(conn, cbData) != 0) {
/* C callback has returned non-zero, do not proceed with
* handshake.
*/
/* Note that C callbacks are no longer called when Lua is
* responsible, so C can no longer filter callbacks for Lua. */
return;
}
}
#if defined(USE_LUA)
/* Step 3: No callback. Check if Lua is responsible. */
else {
/* Step 3.1: Check if Lua is responsible. */
if (conn->ctx->config[LUA_WEBSOCKET_EXTENSIONS]) {
lua_websock =
match_prefix(conn->ctx->config[LUA_WEBSOCKET_EXTENSIONS],
strlen(
conn->ctx->config[LUA_WEBSOCKET_EXTENSIONS]),
path);
}
if (lua_websock) {
/* Step 3.2: Lua is responsible: call it. */
conn->lua_websocket_state = lua_websocket_new(path, conn);
if (!conn->lua_websocket_state) {
/* Lua rejected the new client */
return;
}
}
}
#endif
/* Step 4: Check if there is a responsible websocket handler. */
if (!is_callback_resource && !lua_websock) {
/* There is no callback, an Lua is not responsible either. */
/* Reply with a 404 Not Found or with nothing at all?
* TODO (mid): check the websocket standards, how to reply to
* requests to invalid websocket addresses. */
send_http_error(conn, 404, "%s", "Not found");
return;
}
/* Step 5: The websocket connection has been accepted */
if (!send_websocket_handshake(conn, websock_key)) {
send_http_error(conn, 500, "%s", "Websocket handshake failed");
return;
}
/* Step 6: Call the ready handler */
if (is_callback_resource) {
if (ws_ready_handler != NULL) {
ws_ready_handler(conn, cbData);
}
#if defined(USE_LUA)
}
else if (lua_websock) {
if (!lua_websocket_ready(conn, conn->lua_websocket_state)) {
/* the ready handler returned false */
return;
}
#endif
}
/* Step 7: Enter the read loop */
if (is_callback_resource) {
read_websocket(conn, ws_data_handler, cbData);
#if defined(USE_LUA)
}
else if (lua_websock) {
read_websocket(conn, lua_websocket_data, conn->lua_websocket_state);
#endif
}
/* Step 8: Call the close handler */
if (ws_close_handler) {
ws_close_handler(conn, cbData);
}
}
static int
is_websocket_protocol(const struct mg_connection *conn)
{
const char *upgrade, *connection;
/* A websocket protocoll has the following HTTP headers:
*
* Connection: Upgrade
* Upgrade: Websocket
*/
upgrade = mg_get_header(conn, "Upgrade");
if (upgrade == NULL) {
return 0; /* fail early, don't waste time checking other header
* fields
*/
}
if (!mg_strcasestr(upgrade, "websocket")) {
return 0;
}
connection = mg_get_header(conn, "Connection");
if (connection == NULL) {
return 0;
}
if (!mg_strcasestr(connection, "upgrade")) {
return 0;
}
/* The headers "Host", "Sec-WebSocket-Key", "Sec-WebSocket-Protocol" and
* "Sec-WebSocket-Version" are also required.
* Don't check them here, since even an unsupported websocket protocol
* request still IS a websocket request (in contrast to a standard HTTP
* request). It will fail later in handle_websocket_request.
*/
return 1;
}
#endif /* !USE_WEBSOCKET */
static int
isbyte(int n)
{
return n >= 0 && n <= 255;
}
static int
parse_net(const char *spec, uint32_t *net, uint32_t *mask)
{
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5
|| sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) && isbyte(a)
&& isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0
&& slash < 33) {
len = n;
*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8)
| (uint32_t)d;
*mask = slash ? 0xffffffffU << (32 - slash) : 0;
}
return len;
}
static int
set_throttle(const char *spec, uint32_t remote_ip, const char *uri)
{
int throttle = 0;
struct vec vec, val;
uint32_t net, mask;
char mult;
double v;
while ((spec = next_option(spec, &vec, &val)) != NULL) {
mult = ',';
if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0
|| (lowercase(&mult) != 'k' && lowercase(&mult) != 'm'
&& mult != ',')) {
continue;
}
v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576
: 1;
if (vec.len == 1 && vec.ptr[0] == '*') {
throttle = (int)v;
}
else if (parse_net(vec.ptr, &net, &mask) > 0) {
if ((remote_ip & mask) == net) {
throttle = (int)v;
}
}
else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
throttle = (int)v;
}
}
return throttle;
}
static uint32_t
get_remote_ip(const struct mg_connection *conn)
{
if (!conn) {
return 0;
}
return ntohl(*(uint32_t *)&conn->client.rsa.sin.sin_addr);
}
/* Experimental replacement for mg_upload. */
#include "handle_form.inl"
/* Replacement for mg_upload (Note: mg_upload is deprecated) */
struct mg_upload_user_data {
struct mg_connection *conn;
const char *destination_dir;
int num_uploaded_files;
};
/* Helper function for deprecated mg_upload. */
static int
mg_upload_field_found(const char *key,
const char *filename,
char *path,
size_t pathlen,
void *user_data)
{
int truncated = 0;
struct mg_upload_user_data *fud = (struct mg_upload_user_data *)user_data;
(void)key;
if (!filename) {
mg_cry(fud->conn, "%s: No filename set", __func__);
return FORM_FIELD_STORAGE_ABORT;
}
mg_snprintf(fud->conn,
&truncated,
path,
pathlen - 1,
"%s/%s",
fud->destination_dir,
filename);
if (!truncated) {
mg_cry(fud->conn, "%s: File path too long", __func__);
return FORM_FIELD_STORAGE_ABORT;
}
return FORM_FIELD_STORAGE_STORE;
}
/* Helper function for deprecated mg_upload. */
static int
mg_upload_field_get(const char *key,
const char *value,
size_t value_size,
void *user_data)
{
/* Function should never be called */
(void)key;
(void)value;
(void)value_size;
(void)user_data;
return 0;
}
/* Helper function for deprecated mg_upload. */
static int
mg_upload_field_stored(const char *path, size_t file_size, void *user_data)
{
struct mg_upload_user_data *fud = (struct mg_upload_user_data *)user_data;
(void)file_size;
fud->num_uploaded_files++;
fud->conn->ctx->callbacks.upload(fud->conn, path);
return 0;
}
/* Deprecated function mg_upload - use mg_handle_form_request instead. */
int
mg_upload(struct mg_connection *conn, const char *destination_dir)
{
struct mg_upload_user_data fud = { conn, destination_dir, 0 };
struct mg_form_data_handler fdh = { mg_upload_field_found,
mg_upload_field_get,
mg_upload_field_stored,
0 };
int ret;
fdh.user_data = (void *)&fud;
ret = mg_handle_form_request(conn, &fdh);
if (ret < 0) {
mg_cry(conn, "%s: Error while parsing the request", __func__);
}
return fud.num_uploaded_files;
}
static int
get_first_ssl_listener_index(const struct mg_context *ctx)
{
unsigned int i;
int idx = -1;
if (ctx) {
for (i = 0; idx == -1 && i < ctx->num_listening_sockets; i++) {
idx = ctx->listening_sockets[i].is_ssl ? ((int)(i)) : -1;
}
}
return idx;
}
static void
redirect_to_https_port(struct mg_connection *conn, int ssl_index)
{
char host[1025];
const char *host_header;
size_t hostlen;
host_header = mg_get_header(conn, "Host");
hostlen = sizeof(host);
if (host_header != NULL) {
char *pos;
mg_strlcpy(host, host_header, hostlen);
host[hostlen - 1] = '\0';
pos = strchr(host, ':');
if (pos != NULL) {
*pos = '\0';
}
}
else {
/* Cannot get host from the Host: header.
* Fallback to our IP address. */
if (conn) {
sockaddr_to_string(host, hostlen, &conn->client.lsa);
}
}
/* Send host, port, uri and (if it exists) ?query_string */
if (conn) {
mg_printf(conn,
"HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s%s%s\r\n\r\n",
host,
(int)ntohs(
conn->ctx->listening_sockets[ssl_index].lsa.sin.sin_port),
conn->request_info.local_uri,
(conn->request_info.query_string == NULL) ? "" : "?",
(conn->request_info.query_string == NULL)
? ""
: conn->request_info.query_string);
}
}
static void
mg_set_handler_type(struct mg_context *ctx,
const char *uri,
int handler_type,
int is_delete_request,
mg_request_handler handler,
mg_websocket_connect_handler connect_handler,
mg_websocket_ready_handler ready_handler,
mg_websocket_data_handler data_handler,
mg_websocket_close_handler close_handler,
mg_authorization_handler auth_handler,
void *cbdata)
{
struct mg_handler_info *tmp_rh, **lastref;
size_t urilen = strlen(uri);
if (handler_type == WEBSOCKET_HANDLER) {
/* assert(handler == NULL); */
/* assert(is_delete_request || connect_handler!=NULL ||
* ready_handler!=NULL || data_handler!=NULL ||
* close_handler!=NULL);
*/
/* assert(auth_handler == NULL); */
if (handler != NULL) {
return;
}
if (!is_delete_request && connect_handler == NULL
&& ready_handler == NULL
&& data_handler == NULL
&& close_handler == NULL) {
return;
}
if (auth_handler != NULL) {
return;
}
}
else if (handler_type == REQUEST_HANDLER) {
/* assert(connect_handler==NULL && ready_handler==NULL &&
* data_handler==NULL && close_handler==NULL); */
/* assert(is_delete_request || (handler!=NULL));
*/
/* assert(auth_handler == NULL); */
if (connect_handler != NULL || ready_handler != NULL
|| data_handler != NULL
|| close_handler != NULL) {
return;
}
if (!is_delete_request && (handler == NULL)) {
return;
}
if (auth_handler != NULL) {
return;
}
}
else { /* AUTH_HANDLER */
/* assert(handler == NULL); */
/* assert(connect_handler==NULL && ready_handler==NULL &&
* data_handler==NULL && close_handler==NULL); */
/* assert(auth_handler != NULL); */
if (handler != NULL) {
return;
}
if (connect_handler != NULL || ready_handler != NULL
|| data_handler != NULL
|| close_handler != NULL) {
return;
}
if (!is_delete_request && (auth_handler == NULL)) {
return;
}
}
if (!ctx) {
return;
}
mg_lock_context(ctx);
/* first try to find an existing handler */
lastref = &(ctx->handlers);
for (tmp_rh = ctx->handlers; tmp_rh != NULL; tmp_rh = tmp_rh->next) {
if (tmp_rh->handler_type == handler_type) {
if (urilen == tmp_rh->uri_len && !strcmp(tmp_rh->uri, uri)) {
if (!is_delete_request) {
/* update existing handler */
if (handler_type == REQUEST_HANDLER) {
tmp_rh->handler = handler;
}
else if (handler_type == WEBSOCKET_HANDLER) {
tmp_rh->connect_handler = connect_handler;
tmp_rh->ready_handler = ready_handler;
tmp_rh->data_handler = data_handler;
tmp_rh->close_handler = close_handler;
}
else { /* AUTH_HANDLER */
tmp_rh->auth_handler = auth_handler;
}
tmp_rh->cbdata = cbdata;
}
else {
/* remove existing handler */
*lastref = tmp_rh->next;
mg_free(tmp_rh->uri);
mg_free(tmp_rh);
}
mg_unlock_context(ctx);
return;
}
}
lastref = &(tmp_rh->next);
}
if (is_delete_request) {
/* no handler to set, this was a remove request to a non-existing
* handler */
mg_unlock_context(ctx);
return;
}
tmp_rh =
(struct mg_handler_info *)mg_calloc(sizeof(struct mg_handler_info), 1);
if (tmp_rh == NULL) {
mg_unlock_context(ctx);
mg_cry(fc(ctx), "%s", "Cannot create new request handler struct, OOM");
return;
}
tmp_rh->uri = mg_strdup(uri);
if (!tmp_rh->uri) {
mg_unlock_context(ctx);
mg_free(tmp_rh);
mg_cry(fc(ctx), "%s", "Cannot create new request handler struct, OOM");
return;
}
tmp_rh->uri_len = urilen;
if (handler_type == REQUEST_HANDLER) {
tmp_rh->handler = handler;
}
else if (handler_type == WEBSOCKET_HANDLER) {
tmp_rh->connect_handler = connect_handler;
tmp_rh->ready_handler = ready_handler;
tmp_rh->data_handler = data_handler;
tmp_rh->close_handler = close_handler;
}
else { /* AUTH_HANDLER */
tmp_rh->auth_handler = auth_handler;
}
tmp_rh->cbdata = cbdata;
tmp_rh->handler_type = handler_type;
tmp_rh->next = NULL;
*lastref = tmp_rh;
mg_unlock_context(ctx);
}
void
mg_set_request_handler(struct mg_context *ctx,
const char *uri,
mg_request_handler handler,
void *cbdata)
{
mg_set_handler_type(ctx,
uri,
REQUEST_HANDLER,
handler == NULL,
handler,
NULL,
NULL,
NULL,
NULL,
NULL,
cbdata);
}
void
mg_set_websocket_handler(struct mg_context *ctx,
const char *uri,
mg_websocket_connect_handler connect_handler,
mg_websocket_ready_handler ready_handler,
mg_websocket_data_handler data_handler,
mg_websocket_close_handler close_handler,
void *cbdata)
{
int is_delete_request = (connect_handler == NULL) && (ready_handler == NULL)
&& (data_handler == NULL)
&& (close_handler == NULL);
mg_set_handler_type(ctx,
uri,
WEBSOCKET_HANDLER,
is_delete_request,
NULL,
connect_handler,
ready_handler,
data_handler,
close_handler,
NULL,
cbdata);
}
void
mg_set_auth_handler(struct mg_context *ctx,
const char *uri,
mg_request_handler handler,
void *cbdata)
{
mg_set_handler_type(ctx,
uri,
AUTH_HANDLER,
handler == NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
handler,
cbdata);
}
static int
get_request_handler(struct mg_connection *conn,
int handler_type,
mg_request_handler *handler,
mg_websocket_connect_handler *connect_handler,
mg_websocket_ready_handler *ready_handler,
mg_websocket_data_handler *data_handler,
mg_websocket_close_handler *close_handler,
mg_authorization_handler *auth_handler,
void **cbdata)
{
const struct mg_request_info *request_info = mg_get_request_info(conn);
if (request_info) {
const char *uri = request_info->local_uri;
size_t urilen = strlen(uri);
struct mg_handler_info *tmp_rh;
if (!conn || !conn->ctx) {
return 0;
}
mg_lock_context(conn->ctx);
/* first try for an exact match */
for (tmp_rh = conn->ctx->handlers; tmp_rh != NULL;
tmp_rh = tmp_rh->next) {
if (tmp_rh->handler_type == handler_type) {
if (urilen == tmp_rh->uri_len && !strcmp(tmp_rh->uri, uri)) {
if (handler_type == WEBSOCKET_HANDLER) {
*connect_handler = tmp_rh->connect_handler;
*ready_handler = tmp_rh->ready_handler;
*data_handler = tmp_rh->data_handler;
*close_handler = tmp_rh->close_handler;
}
else if (handler_type == REQUEST_HANDLER) {
*handler = tmp_rh->handler;
}
else { /* AUTH_HANDLER */
*auth_handler = tmp_rh->auth_handler;
}
*cbdata = tmp_rh->cbdata;
mg_unlock_context(conn->ctx);
return 1;
}
}
}
/* next try for a partial match, we will accept uri/something */
for (tmp_rh = conn->ctx->handlers; tmp_rh != NULL;
tmp_rh = tmp_rh->next) {
if (tmp_rh->handler_type == handler_type) {
if (tmp_rh->uri_len < urilen && uri[tmp_rh->uri_len] == '/'
&& memcmp(tmp_rh->uri, uri, tmp_rh->uri_len) == 0) {
if (handler_type == WEBSOCKET_HANDLER) {
*connect_handler = tmp_rh->connect_handler;
*ready_handler = tmp_rh->ready_handler;
*data_handler = tmp_rh->data_handler;
*close_handler = tmp_rh->close_handler;
}
else if (handler_type == REQUEST_HANDLER) {
*handler = tmp_rh->handler;
}
else { /* AUTH_HANDLER */
*auth_handler = tmp_rh->auth_handler;
}
*cbdata = tmp_rh->cbdata;
mg_unlock_context(conn->ctx);
return 1;
}
}
}
/* finally try for pattern match */
for (tmp_rh = conn->ctx->handlers; tmp_rh != NULL;
tmp_rh = tmp_rh->next) {
if (tmp_rh->handler_type == handler_type) {
if (match_prefix(tmp_rh->uri, tmp_rh->uri_len, uri) > 0) {
if (handler_type == WEBSOCKET_HANDLER) {
*connect_handler = tmp_rh->connect_handler;
*ready_handler = tmp_rh->ready_handler;
*data_handler = tmp_rh->data_handler;
*close_handler = tmp_rh->close_handler;
}
else if (handler_type == REQUEST_HANDLER) {
*handler = tmp_rh->handler;
}
else { /* AUTH_HANDLER */
*auth_handler = tmp_rh->auth_handler;
}
*cbdata = tmp_rh->cbdata;
mg_unlock_context(conn->ctx);
return 1;
}
}
}
mg_unlock_context(conn->ctx);
}
return 0; /* none found */
}
#if defined(USE_WEBSOCKET) && defined(MG_LEGACY_INTERFACE)
static int
deprecated_websocket_connect_wrapper(const struct mg_connection *conn,
void *cbdata)
{
struct mg_callbacks *pcallbacks = (struct mg_callbacks *)cbdata;
if (pcallbacks->websocket_connect) {
return pcallbacks->websocket_connect(conn);
}
/* No handler set - assume "OK" */
return 0;
}
static void
deprecated_websocket_ready_wrapper(struct mg_connection *conn, void *cbdata)
{
struct mg_callbacks *pcallbacks = (struct mg_callbacks *)cbdata;
if (pcallbacks->websocket_ready) {
pcallbacks->websocket_ready(conn);
}
}
static int
deprecated_websocket_data_wrapper(struct mg_connection *conn,
int bits,
char *data,
size_t len,
void *cbdata)
{
struct mg_callbacks *pcallbacks = (struct mg_callbacks *)cbdata;
if (pcallbacks->websocket_data) {
return pcallbacks->websocket_data(conn, bits, data, len);
}
/* No handler set - assume "OK" */
return 1;
}
#endif
/* This is the heart of the Civetweb's logic.
* This function is called when the request is read, parsed and validated,
* and Civetweb must decide what action to take: serve a file, or
* a directory, or call embedded function, etcetera. */
static void
handle_request(struct mg_connection *conn)
{
if (conn) {
struct mg_request_info *ri = &conn->request_info;
char path[PATH_MAX];
int uri_len, ssl_index;
int is_found = 0, is_script_resource = 0, is_websocket_request = 0,
is_put_or_delete_request = 0, is_callback_resource = 0;
int i;
struct file file = STRUCT_FILE_INITIALIZER;
mg_request_handler callback_handler = NULL;
mg_websocket_connect_handler ws_connect_handler = NULL;
mg_websocket_ready_handler ws_ready_handler = NULL;
mg_websocket_data_handler ws_data_handler = NULL;
mg_websocket_close_handler ws_close_handler = NULL;
void *callback_data = NULL;
mg_authorization_handler auth_handler = NULL;
void *auth_callback_data = NULL;
#if !defined(NO_FILES)
time_t curtime = time(NULL);
char date[64];
#endif
path[0] = 0;
if (!ri) {
return;
}
/* 1. get the request url */
/* 1.1. split into url and query string */
if ((conn->request_info.query_string = strchr(ri->request_uri, '?'))
!= NULL) {
*((char *)conn->request_info.query_string++) = '\0';
}
uri_len = (int)strlen(ri->local_uri);
/* 1.2. decode url (if config says so) */
if (should_decode_url(conn)) {
mg_url_decode(
ri->local_uri, uri_len, (char *)ri->local_uri, uri_len + 1, 0);
}
/* 1.3. clean URIs, so a path like allowed_dir/../forbidden_file is
* not
* possible */
remove_double_dots_and_double_slashes((char *)ri->local_uri);
/* step 1. completed, the url is known now */
DEBUG_TRACE("URL: %s", ri->local_uri);
/* 2. do a https redirect, if required */
if (!conn->client.is_ssl && conn->client.ssl_redir) {
ssl_index = get_first_ssl_listener_index(conn->ctx);
if (ssl_index >= 0) {
redirect_to_https_port(conn, ssl_index);
}
else {
/* A http to https forward port has been specified,
* but no https port to forward to. */
send_http_error(conn,
503,
"%s",
"Error: SSL forward not configured properly");
mg_cry(conn, "Can not redirect to SSL, no SSL port available");
}
return;
}
/* 3. if this ip has limited speed, set it for this connection */
conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
get_remote_ip(conn),
ri->local_uri);
/* 4. call a "handle everything" callback, if registered */
if (conn->ctx->callbacks.begin_request != NULL) {
/* Note that since V1.7 the "begin_request" function is called
* before an authorization check. If an authorization check is
* required, use a request_handler instead. */
i = conn->ctx->callbacks.begin_request(conn);
if (i > 0) {
/* callback already processed the request. Store the
return value as a status code for the access log. */
conn->status_code = i;
return;
}
else if (i == 0) {
/* civetweb should process the request */
}
else {
/* unspecified - may change with the next version */
return;
}
}
/* request not yet handled by a handler or redirect, so the request
* is processed here */
/* 5. interpret the url to find out how the request must be handled
*/
/* 5.1. first test, if the request targets the regular http(s)://
* protocol namespace or the websocket ws(s):// protocol namespace.
*/
is_websocket_request = is_websocket_protocol(conn);
/* 5.2. check if the request will be handled by a callback */
if (get_request_handler(conn,
is_websocket_request ? WEBSOCKET_HANDLER
: REQUEST_HANDLER,
&callback_handler,
&ws_connect_handler,
&ws_ready_handler,
&ws_data_handler,
&ws_close_handler,
NULL,
&callback_data)) {
/* 5.2.1. A callback will handle this request. All requests
* handled
* by a callback have to be considered as requests to a script
* resource. */
is_callback_resource = 1;
is_script_resource = 1;
is_put_or_delete_request = is_put_or_delete_method(conn);
}
else {
no_callback_resource:
/* 5.2.2. No callback is responsible for this request. The URI
* addresses a file based resource (static content or Lua/cgi
* scripts in the file system). */
is_callback_resource = 0;
interpret_uri(conn,
path,
sizeof(path),
&file,
&is_found,
&is_script_resource,
&is_websocket_request,
&is_put_or_delete_request);
}
/* 6. authorization check */
/* 6.1. a custom authorization handler is installed */
if (get_request_handler(conn,
AUTH_HANDLER,
NULL,
NULL,
NULL,
NULL,
NULL,
&auth_handler,
&auth_callback_data)) {
if (!auth_handler(conn, auth_callback_data)) {
return;
}
}
else if (is_put_or_delete_request && !is_script_resource
&& !is_callback_resource) {
/* 6.2. this request is a PUT/DELETE to a real file */
/* 6.2.1. thus, the server must have real files */
#if defined(NO_FILES)
if (1) {
#else
if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
#endif
/* This server does not have any real files, thus the
* PUT/DELETE methods are not valid. */
send_http_error(conn,
405,
"%s method not allowed",
conn->request_info.request_method);
return;
}
#if !defined(NO_FILES)
/* 6.2.2. Check if put authorization for static files is available.
*/
if (!is_authorized_for_put(conn)) {
send_authorization_request(conn);
return;
}
#endif
}
else {
/* 6.3. This is either a OPTIONS, GET, HEAD or POST request,
* or it is a PUT or DELETE request to a resource that does not
* correspond to a file. Check authorization. */
if (!check_authorization(conn, path)) {
send_authorization_request(conn);
return;
}
}
/* request is authorized or does not need authorization */
/* 7. check if there are request handlers for this uri */
if (is_callback_resource) {
if (!is_websocket_request) {
i = callback_handler(conn, callback_data);
if (i > 0) {
/* Do nothing, callback has served the request. Store
* the
* return value as status code for the log and discard
* all
* data from the client not used by the callback. */
conn->status_code = i;
discard_unread_request_data(conn);
}
else {
/* TODO (high): what if the handler did NOT handle the
* request */
/* The last version did handle this as a file request,
* but
* since a file request is not always a script resource,
* the authorization check might be different */
interpret_uri(conn,
path,
sizeof(path),
&file,
&is_found,
&is_script_resource,
&is_websocket_request,
&is_put_or_delete_request);
callback_handler = NULL;
/* TODO (very low): goto is deprecated but for the
* moment,
* a goto is simpler than some curious loop. */
/* The situation "callback does not handle the request"
* needs to be reconsidered anyway. */
goto no_callback_resource;
}
}
else {
#if defined(USE_WEBSOCKET)
handle_websocket_request(conn,
path,
is_callback_resource,
ws_connect_handler,
ws_ready_handler,
ws_data_handler,
ws_close_handler,
callback_data);
#endif
}
return;
}
/* 8. handle websocket requests */
#if defined(USE_WEBSOCKET)
if (is_websocket_request) {
if (is_script_resource) {
/* Websocket Lua script */
handle_websocket_request(conn,
path,
0 /* Lua Script */,
NULL,
NULL,
NULL,
NULL,
&conn->ctx->callbacks);
}
else {
#if defined(MG_LEGACY_INTERFACE)
handle_websocket_request(
conn,
path,
!is_script_resource /* could be deprecated global callback */,
deprecated_websocket_connect_wrapper,
deprecated_websocket_ready_wrapper,
deprecated_websocket_data_wrapper,
NULL,
&conn->ctx->callbacks);
#else
send_http_error(conn, 404, "%s", "Not found");
#endif
}
return;
}
else
#endif
#if defined(NO_FILES)
/* 9a. In case the server uses only callbacks, this uri is
* unknown.
* Then, all request handling ends here. */
send_http_error(conn, 404, "%s", "Not Found");
#else
/* 9b. This request is either for a static file or resource handled
* by a script file. Thus, a DOCUMENT_ROOT must exist. */
if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
send_http_error(conn, 404, "%s", "Not Found");
return;
}
/* 10. File is handled by a script. */
if (is_script_resource) {
handle_file_based_request(conn, path, &file);
return;
}
/* 11. Handle put/delete/mkcol requests */
if (is_put_or_delete_request) {
/* 11.1. PUT method */
if (!strcmp(ri->request_method, "PUT")) {
put_file(conn, path);
return;
}
/* 11.2. DELETE method */
if (!strcmp(ri->request_method, "DELETE")) {
delete_file(conn, path);
return;
}
/* 11.3. MKCOL method */
if (!strcmp(ri->request_method, "MKCOL")) {
mkcol(conn, path);
return;
}
/* 11.4. PATCH method
* This method is not supported for static resources,
* only for scripts (Lua, CGI) and callbacks. */
send_http_error(conn,
405,
"%s method not allowed",
conn->request_info.request_method);
return;
}
/* 11. File does not exist, or it was configured that it should be
* hidden */
if (!is_found || (must_hide_file(conn, path))) {
send_http_error(conn, 404, "%s", "Not found");
return;
}
/* 12. Directory uris should end with a slash */
if (file.is_directory && ri->local_uri[uri_len - 1] != '/') {
gmt_time_string(date, sizeof(date), &curtime);
mg_printf(conn,
"HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n"
"Date: %s\r\n"
/* "Cache-Control: private\r\n" (= default) */
"Content-Length: 0\r\n"
"Connection: %s\r\n\r\n",
ri->request_uri,
date,
suggest_connection_header(conn));
return;
}
/* 13. Handle other methods than GET/HEAD */
/* 13.1. Handle PROPFIND */
if (!strcmp(ri->request_method, "PROPFIND")) {
handle_propfind(conn, path, &file);
return;
}
/* 13.2. Handle OPTIONS for files */
if (!strcmp(ri->request_method, "OPTIONS")) {
/* This standard handler is only used for real files.
* Scripts should support the OPTIONS method themselves, to allow a
* maximum flexibility.
* Lua and CGI scripts may fully support CORS this way (including
* preflights). */
send_options(conn);
return;
}
/* 13.3. everything but GET and HEAD (e.g. POST) */
if (0 != strcmp(ri->request_method, "GET")
&& 0 != strcmp(ri->request_method, "HEAD")) {
send_http_error(conn,
405,
"%s method not allowed",
conn->request_info.request_method);
return;
}
/* 14. directories */
if (file.is_directory) {
if (substitute_index_file(conn, path, sizeof(path), &file)) {
/* 14.1. use a substitute file */
/* TODO (high): substitute index may be a script resource.
* define what should be possible in this case. */
}
else {
/* 14.2. no substitute file */
if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING],
"yes")) {
handle_directory_request(conn, path);
}
else {
send_http_error(conn,
403,
"%s",
"Error: Directory listing denied");
}
return;
}
}
handle_file_based_request(conn, path, &file);
#endif /* !defined(NO_FILES) */
#if 0
/* Perform redirect and auth checks before calling begin_request()
* handler.
* Otherwise, begin_request() would need to perform auth checks and
* redirects. */
#endif
}
return;
}
static void
handle_file_based_request(struct mg_connection *conn,
const char *path,
struct file *file)
{
if (!conn || !conn->ctx) {
return;
}
if (0) {
#ifdef USE_LUA
}
else if (match_prefix(conn->ctx->config[LUA_SERVER_PAGE_EXTENSIONS],
strlen(
conn->ctx->config[LUA_SERVER_PAGE_EXTENSIONS]),
path) > 0) {
/* Lua server page: an SSI like page containing mostly plain html
* code
* plus some tags with server generated contents. */
handle_lsp_request(conn, path, file, NULL);
}
else if (match_prefix(conn->ctx->config[LUA_SCRIPT_EXTENSIONS],
strlen(conn->ctx->config[LUA_SCRIPT_EXTENSIONS]),
path) > 0) {
/* Lua in-server module script: a CGI like script used to generate
* the
* entire reply. */
mg_exec_lua_script(conn, path, NULL);
#endif
#if defined(USE_DUKTAPE)
}
else if (match_prefix(conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS],
strlen(
conn->ctx->config[DUKTAPE_SCRIPT_EXTENSIONS]),
path) > 0) {
/* Call duktape to generate the page */
mg_exec_duktape_script(conn, path);
#endif
#if !defined(NO_CGI)
}
else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]),
path) > 0) {
/* CGI scripts may support all HTTP methods */
handle_cgi_request(conn, path);
#endif /* !NO_CGI */
}
else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]),
path) > 0) {
handle_ssi_file_request(conn, path, file);
}
else if ((!conn->in_error_handler) && is_not_modified(conn, file)) {
/* Send 304 "Not Modified" - this must not send any body data */
send_http_error(conn, 304, "%s", "");
}
else {
handle_static_file_request(conn, path, file, NULL);
}
}
static void
close_all_listening_sockets(struct mg_context *ctx)
{
unsigned int i;
if (!ctx) {
return;
}
for (i = 0; i < ctx->num_listening_sockets; i++) {
closesocket(ctx->listening_sockets[i].sock);
ctx->listening_sockets[i].sock = INVALID_SOCKET;
}
mg_free(ctx->listening_sockets);
ctx->listening_sockets = NULL;
mg_free(ctx->listening_ports);
ctx->listening_ports = NULL;
}
/* Valid listening port specification is: [ip_address:]port[s]
* Examples for IPv4: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
* Examples for IPv6: [::]:80, [::1]:80,
* [FEDC:BA98:7654:3210:FEDC:BA98:7654:3210]:443s
* see https://tools.ietf.org/html/rfc3513#section-2.2 */
static int
parse_port_string(const struct vec *vec, struct socket *so)
{
unsigned int a, b, c, d, port;
int ch, len;
#if defined(USE_IPV6)
char buf[100] = { 0 };
#endif
/* MacOS needs that. If we do not zero it, subsequent bind() will fail.
* Also, all-zeroes in the socket address means binding to all addresses
* for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT). */
memset(so, 0, sizeof(*so));
so->lsa.sin.sin_family = AF_INET;
if (sscanf(vec->ptr, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len)
== 5) {
/* Bind to a specific IPv4 address, e.g. 192.168.1.5:8080 */
so->lsa.sin.sin_addr.s_addr =
htonl((a << 24) | (b << 16) | (c << 8) | d);
so->lsa.sin.sin_port = htons((uint16_t)port);
#if defined(USE_IPV6)
}
else if (sscanf(vec->ptr, "[%49[^]]]:%u%n", buf, &port, &len) == 2
&& mg_inet_pton(
AF_INET6, buf, &so->lsa.sin6, sizeof(so->lsa.sin6))) {
/* IPv6 address, examples: see above */
/* so->lsa.sin6.sin6_family = AF_INET6; already set by mg_inet_pton
*/
so->lsa.sin6.sin6_port = htons((uint16_t)port);
#endif
}
else if (sscanf(vec->ptr, "%u%n", &port, &len) == 1) {
/* If only port is specified, bind to IPv4, INADDR_ANY */
so->lsa.sin.sin_port = htons((uint16_t)port);
}
else {
/* Parsing failure. Make port invalid. */
port = 0;
len = 0;
}
/* sscanf and the option splitting code ensure the following condition
*/
if ((len < 0) && ((unsigned)len >(unsigned)vec->len)) {
return 0;
}
ch = vec->ptr[len]; /* Next character after the port number */
so->is_ssl = (ch == 's');
so->ssl_redir = (ch == 'r');
/* Make sure the port is valid and vector ends with 's', 'r' or ',' */
return is_valid_port(port)
&& (ch == '\0' || ch == 's' || ch == 'r' || ch == ',');
}
static int
set_ports_option(struct mg_context *ctx)
{
const char *list;
int on = 1;
#if defined(USE_IPV6)
int off = 0;
#endif
struct vec vec;
struct socket so, *ptr;
in_port_t *portPtr;
union usa usa;
socklen_t len;
int portsTotal = 0;
int portsOk = 0;
if (!ctx) {
return 0;
}
memset(&so, 0, sizeof(so));
memset(&usa, 0, sizeof(usa));
len = sizeof(usa);
list = ctx->config[LISTENING_PORTS];
while ((list = next_option(list, &vec, NULL)) != NULL) {
portsTotal++;
if (!parse_port_string(&vec, &so)) {
mg_cry(fc(ctx),
"%.*s: invalid port spec (entry %i). Expecting list of: %s",
(int)vec.len,
vec.ptr,
portsTotal,
"[IP_ADDRESS:]PORT[s|r]");
continue;
}
if (so.is_ssl && ctx->ssl_ctx == NULL) {
mg_cry(fc(ctx),
"Cannot add SSL socket (entry %i). Is -ssl_certificate "
"option set?",
portsTotal);
continue;
}
if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6))
== INVALID_SOCKET) {
mg_cry(fc(ctx), "cannot create socket (entry %i)", portsTotal);
continue;
}
#ifdef _WIN32
/* Windows SO_REUSEADDR lets many procs binds to a
* socket, SO_EXCLUSIVEADDRUSE makes the bind fail
* if someone already has the socket -- DTL */
/* NOTE: If SO_EXCLUSIVEADDRUSE is used,
* Windows might need a few seconds before
* the same port can be used again in the
* same process, so a short Sleep may be
* required between mg_stop and mg_start.
*/
if (setsockopt(so.sock,
SOL_SOCKET,
SO_EXCLUSIVEADDRUSE,
(SOCK_OPT_TYPE)&on,
sizeof(on)) != 0) {
mg_cry(fc(ctx),
"cannot set socket option SO_EXCLUSIVEADDRUSE (entry %i)",
portsTotal);
}
#else
if (setsockopt(so.sock,
SOL_SOCKET,
SO_REUSEADDR,
(SOCK_OPT_TYPE)&on,
sizeof(on)) != 0) {
mg_cry(fc(ctx),
"cannot set socket option SO_REUSEADDR (entry %i)",
portsTotal);
}
#endif
#if defined(USE_IPV6)
if (so.lsa.sa.sa_family == AF_INET6
&& setsockopt(so.sock,
IPPROTO_IPV6,
IPV6_V6ONLY,
(void *)&off,
sizeof(off)) != 0) {
mg_cry(fc(ctx),
"cannot set socket option IPV6_V6ONLY (entry %i)",
portsTotal);
}
#endif
if (so.lsa.sa.sa_family == AF_INET) {
len = sizeof(so.lsa.sin);
if (bind(so.sock, &so.lsa.sa, len) != 0) {
mg_cry(fc(ctx),
"cannot bind to %.*s: %d (%s)",
(int)vec.len,
vec.ptr,
(int)ERRNO,
strerror(errno));
closesocket(so.sock);
so.sock = INVALID_SOCKET;
continue;
}
}
#if defined(USE_IPV6)
else if (so.lsa.sa.sa_family == AF_INET6) {
len = sizeof(so.lsa.sin6);
if (bind(so.sock, &so.lsa.sa, len) != 0) {
mg_cry(fc(ctx),
"cannot bind to IPv6 %.*s: %d (%s)",
(int)vec.len,
vec.ptr,
(int)ERRNO,
strerror(errno));
closesocket(so.sock);
so.sock = INVALID_SOCKET;
continue;
}
}
#endif
else {
mg_cry(fc(ctx),
"cannot bind: address family not supported (entry %i)",
portsTotal);
continue;
}
if (listen(so.sock, SOMAXCONN) != 0) {
mg_cry(fc(ctx),
"cannot listen to %.*s: %d (%s)",
(int)vec.len,
vec.ptr,
(int)ERRNO,
strerror(errno));
closesocket(so.sock);
so.sock = INVALID_SOCKET;
continue;
}
if (getsockname(so.sock, &(usa.sa), &len) != 0) {
int err = (int)ERRNO;
mg_cry(fc(ctx),
"call to getsockname failed %.*s: %d (%s)",
(int)vec.len,
vec.ptr,
err,
strerror(errno));
closesocket(so.sock);
so.sock = INVALID_SOCKET;
continue;
}
if ((ptr = (struct socket *)
mg_realloc(ctx->listening_sockets,
(ctx->num_listening_sockets + 1)
* sizeof(ctx->listening_sockets[0]))) == NULL) {
mg_cry(fc(ctx), "%s", "Out of memory");
closesocket(so.sock);
so.sock = INVALID_SOCKET;
continue;
}
if ((portPtr =
(in_port_t *)mg_realloc(ctx->listening_ports,
(ctx->num_listening_sockets + 1)
* sizeof(ctx->listening_ports[0])))
== NULL) {
mg_cry(fc(ctx), "%s", "Out of memory");
closesocket(so.sock);
so.sock = INVALID_SOCKET;
mg_free(ptr);
continue;
}
set_close_on_exec(so.sock, fc(ctx));
ctx->listening_sockets = ptr;
ctx->listening_sockets[ctx->num_listening_sockets] = so;
ctx->listening_ports = portPtr;
ctx->listening_ports[ctx->num_listening_sockets] =
ntohs(usa.sin.sin_port);
ctx->num_listening_sockets++;
portsOk++;
}
if (portsOk != portsTotal) {
close_all_listening_sockets(ctx);
portsOk = 0;
}
return portsOk;
}
static const char *
header_val(const struct mg_connection *conn, const char *header)
{
const char *header_value;
if ((header_value = mg_get_header(conn, header)) == NULL) {
return "-";
}
else {
return header_value;
}
}
static void
log_access(const struct mg_connection *conn)
{
const struct mg_request_info *ri;
struct file fi;
char date[64], src_addr[IP_ADDR_STR_LEN];
struct tm *tm;
const char *referer;
const char *user_agent;
char buf[4096];
if (!conn || !conn->ctx) {
return;
}
if (conn->ctx->config[ACCESS_LOG_FILE] != NULL) {
if (mg_fopen(conn, conn->ctx->config[ACCESS_LOG_FILE], "a+", &fi)
== 0) {
fi.fp = NULL;
}
}
else {
fi.fp = NULL;
}
if (fi.fp == NULL && conn->ctx->callbacks.log_message == NULL) {
return;
}
tm = localtime(&conn->conn_birth_time);
if (tm != NULL) {
strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z", tm);
}
else {
mg_strlcpy(date, "01/Jan/1970:00:00:00 +0000", sizeof(date));
date[sizeof(date) - 1] = '\0';
}
ri = &conn->request_info;
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
referer = header_val(conn, "Referer");
user_agent = header_val(conn, "User-Agent");
mg_snprintf(conn,
NULL, /* Ignore truncation in access log */
buf,
sizeof(buf),
"%s - %s [%s] \"%s %s%s%s HTTP/%s\" %d %" INT64_FMT " %s %s",
src_addr,
ri->remote_user == NULL ? "-" : ri->remote_user,
date,
ri->request_method ? ri->request_method : "-",
ri->request_uri ? ri->request_uri : "-",
ri->query_string ? "?" : "",
ri->query_string ? ri->query_string : "",
ri->http_version,
conn->status_code,
conn->num_bytes_sent,
referer,
user_agent);
if (conn->ctx->callbacks.log_access) {
conn->ctx->callbacks.log_access(conn, buf);
}
if (fi.fp) {
flockfile(fi.fp);
fprintf(fi.fp, "%s\n", buf);
fflush(fi.fp);
funlockfile(fi.fp);
mg_fclose(&fi);
}
}
/* Verify given socket address against the ACL.
* Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
*/
static int
check_acl(struct mg_context *ctx, uint32_t remote_ip)
{
int allowed, flag;
uint32_t net, mask;
struct vec vec;
if (ctx) {
const char *list = ctx->config[ACCESS_CONTROL_LIST];
/* If any ACL is set, deny by default */
allowed = list == NULL ? '+' : '-';
while ((list = next_option(list, &vec, NULL)) != NULL) {
flag = vec.ptr[0];
if ((flag != '+' && flag != '-')
|| parse_net(&vec.ptr[1], &net, &mask) == 0) {
mg_cry(fc(ctx),
"%s: subnet must be [+|-]x.x.x.x[/x]",
__func__);
return -1;
}
if (net == (remote_ip & mask)) {
allowed = flag;
}
}
return allowed == '+';
}
return -1;
}
#if !defined(_WIN32)
static int
set_uid_option(struct mg_context *ctx)
{
struct passwd *pw;
if (ctx) {
const char *uid = ctx->config[RUN_AS_USER];
int success = 0;
if (uid == NULL) {
success = 1;
}
else {
if ((pw = getpwnam(uid)) == NULL) {
mg_cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
}
else if (setgid(pw->pw_gid) == -1) {
mg_cry(fc(ctx),
"%s: setgid(%s): %s",
__func__,
uid,
strerror(errno));
}
else if (setgroups(0, NULL)) {
mg_cry(fc(ctx),
"%s: setgroups(): %s",
__func__,
strerror(errno));
}
else if (setuid(pw->pw_uid) == -1) {
mg_cry(fc(ctx),
"%s: setuid(%s): %s",
__func__,
uid,
strerror(errno));
}
else {
success = 1;
}
}
return success;
}
return 0;
}
#endif /* !_WIN32 */
static void
tls_dtor(void *key)
{
struct mg_workerTLS *tls = (struct mg_workerTLS *)key;
/* key == pthread_getspecific(sTlsKey); */
if (tls) {
if (tls->is_master == 2) {
tls->is_master = -3; /* Mark memory as dead */
mg_free(tls);
}
}
pthread_setspecific(sTlsKey, NULL);
}
#if !defined(NO_SSL)
/* Must be set if sizeof(pthread_t) > sizeof(unsigned long) */
static unsigned long
ssl_id_callback(void)
{
#ifdef _WIN32
return GetCurrentThreadId();
#else
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunreachable-code"
/* For every compiler, either "sizeof(pthread_t) > sizeof(unsigned long)"
* or not, so one of the two conditions will be unreachable by construction.
* Unfortunately the C standard does not define a way to check this at
* compile time, since the #if preprocessor conditions can not use the sizeof
* operator as an argument. */
#endif
if (sizeof(pthread_t) > sizeof(unsigned long)) {
/* This is the problematic case for CRYPTO_set_id_callback:
* The OS pthread_t can not be cast to unsigned long. */
struct mg_workerTLS *tls =
(struct mg_workerTLS *)pthread_getspecific(sTlsKey);
if (tls == NULL) {
/* SSL called from an unknown thread: Create some thread index.
*/
tls = (struct mg_workerTLS *)mg_malloc(sizeof(struct mg_workerTLS));
tls->is_master = -2; /* -2 means "3rd party thread" */
tls->thread_idx = (unsigned)mg_atomic_inc(&thread_idx_max);
pthread_setspecific(sTlsKey, tls);
}
return tls->thread_idx;
}
else {
return (unsigned long)pthread_self();
}
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#endif
}
static pthread_mutex_t *ssl_mutexes;
static int
sslize(struct mg_connection *conn, SSL_CTX *s, int(*func)(SSL *))
{
int ret, err;
if (!conn) {
return 0;
}
conn->ssl = SSL_new(s);
if (conn->ssl == NULL) {
return 0;
}
ret = SSL_set_fd(conn->ssl, conn->client.sock);
if (ret != 1) {
err = SSL_get_error(conn->ssl, ret);
(void)err; /* TODO: set some error message */
SSL_free(conn->ssl);
conn->ssl = NULL;
/* maybe not? CRYPTO_cleanup_all_ex_data(); */
/* see https://wiki.openssl.org/index.php/Talk:Library_Initialization */
ERR_remove_state(0);
return 0;
}
ret = func(conn->ssl);
if (ret != 1) {
err = SSL_get_error(conn->ssl, ret);
(void)err; /* TODO: set some error message */
SSL_free(conn->ssl);
conn->ssl = NULL;
/* maybe not? CRYPTO_cleanup_all_ex_data(); */
/* see https://wiki.openssl.org/index.php/Talk:Library_Initialization */
ERR_remove_state(0);
return 0;
}
return 1;
}
/* Return OpenSSL error message (from CRYPTO lib) */
static const char *
ssl_error(void)
{
unsigned long err;
err = ERR_get_error();
return err == 0 ? "" : ERR_error_string(err, NULL);
}
static void
ssl_locking_callback(int mode, int mutex_num, const char *file, int line)
{
(void)line;
(void)file;
if (mode & 1) {
/* 1 is CRYPTO_LOCK */
(void)pthread_mutex_lock(&ssl_mutexes[mutex_num]);
}
else {
(void)pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
}
}
#if !defined(NO_SSL_DL)
static void *
load_dll(struct mg_context *ctx, const char *dll_name, struct ssl_func *sw)
{
union {
void *p;
void(*fp)(void);
} u;
void *dll_handle;
struct ssl_func *fp;
if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
mg_cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
return NULL;
}
for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
/* GetProcAddress() returns pointer to function */
u.fp = (void(*)(void))dlsym(dll_handle, fp->name);
#else
/* dlsym() on UNIX returns void *. ISO C forbids casts of data
* pointers to function pointers. We need to use a union to make a
* cast. */
u.p = dlsym(dll_handle, fp->name);
#endif /* _WIN32 */
if (u.fp == NULL) {
mg_cry(fc(ctx),
"%s: %s: cannot find %s",
__func__,
dll_name,
fp->name);
dlclose(dll_handle);
return NULL;
}
else {
fp->ptr = u.fp;
}
}
return dll_handle;
}
static void *ssllib_dll_handle; /* Store the ssl library handle. */
static void *cryptolib_dll_handle; /* Store the crypto library handle. */
#endif /* NO_SSL_DL */
#if defined(SSL_ALREADY_INITIALIZED)
static int cryptolib_users = 1; /* Reference counter for crypto library. */
#else
static int cryptolib_users = 0; /* Reference counter for crypto library. */
#endif
static int
initialize_ssl(struct mg_context *ctx)
{
int i;
size_t size;
#if !defined(NO_SSL_DL)
if (!cryptolib_dll_handle) {
cryptolib_dll_handle = load_dll(ctx, CRYPTO_LIB, crypto_sw);
if (!cryptolib_dll_handle) {
return 0;
}
}
#endif /* NO_SSL_DL */
if (mg_atomic_inc(&cryptolib_users) > 1) {
return 1;
}
/* Initialize locking callbacks, needed for thread safety.
* http://www.openssl.org/support/faq.html#PROG1
*/
i = CRYPTO_num_locks();
if (i < 0) {
i = 0;
}
size = sizeof(pthread_mutex_t) * ((size_t)(i));
if ((ssl_mutexes = (pthread_mutex_t *)mg_malloc(size)) == NULL) {
mg_cry(fc(ctx),
"%s: cannot allocate mutexes: %s",
__func__,
ssl_error());
return 0;
}
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_init(&ssl_mutexes[i], &pthread_mutex_attr);
}
CRYPTO_set_locking_callback(&ssl_locking_callback);
CRYPTO_set_id_callback(&ssl_id_callback);
return 1;
}
static int
ssl_use_pem_file(struct mg_context *ctx, const char *pem)
{
if (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0) {
mg_cry(fc(ctx),
"%s: cannot open certificate file %s: %s",
__func__,
pem,
ssl_error());
return 0;
}
/* could use SSL_CTX_set_default_passwd_cb_userdata */
if (SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0) {
mg_cry(fc(ctx),
"%s: cannot open private key file %s: %s",
__func__,
pem,
ssl_error());
return 0;
}
if (SSL_CTX_check_private_key(ctx->ssl_ctx) == 0) {
mg_cry(fc(ctx),
"%s: certificate and private key do not match: %s",
__func__,
pem);
return 0;
}
if (SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem) == 0) {
mg_cry(fc(ctx),
"%s: cannot use certificate chain file %s: %s",
__func__,
pem,
ssl_error());
return 0;
}
return 1;
}
static long
ssl_get_protocol(int version_id)
{
long ret = SSL_OP_ALL;
if (version_id > 0)
ret |= SSL_OP_NO_SSLv2;
if (version_id > 1)
ret |= SSL_OP_NO_SSLv3;
if (version_id > 2)
ret |= SSL_OP_NO_TLSv1;
if (version_id > 3)
ret |= SSL_OP_NO_TLSv1_1;
return ret;
}
/* Dynamically load SSL library. Set up ctx->ssl_ctx pointer. */
static int
set_ssl_option(struct mg_context *ctx)
{
const char *pem;
int callback_ret;
int should_verify_peer;
const char *ca_path;
const char *ca_file;
int use_default_verify_paths;
int verify_depth;
time_t now_rt = time(NULL);
struct timespec now_mt;
md5_byte_t ssl_context_id[16];
md5_state_t md5state;
int protocol_ver;
/* If PEM file is not specified and the init_ssl callback
* is not specified, skip SSL initialization. */
if (!ctx) {
return 0;
}
if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL
&& ctx->callbacks.init_ssl == NULL) {
return 1;
}
if (!initialize_ssl(ctx)) {
return 0;
}
#if !defined(NO_SSL_DL)
if (!ssllib_dll_handle) {
ssllib_dll_handle = load_dll(ctx, SSL_LIB, ssl_sw);
if (!ssllib_dll_handle) {
return 0;
}
}
#endif /* NO_SSL_DL */
/* Initialize SSL library */
SSL_library_init();
SSL_load_error_strings();
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
mg_cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
return 0;
}
SSL_CTX_clear_options(ctx->ssl_ctx,
SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1
| SSL_OP_NO_TLSv1_1);
protocol_ver = atoi(ctx->config[SSL_PROTOCOL_VERSION]);
SSL_CTX_set_options(ctx->ssl_ctx, ssl_get_protocol(protocol_ver));
SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_SINGLE_DH_USE);
SSL_CTX_set_ecdh_auto(ctx->ssl_ctx, 1);
/* If a callback has been specified, call it. */
callback_ret =
(ctx->callbacks.init_ssl == NULL)
? 0
: (ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data));
/* If callback returns 0, civetweb sets up the SSL certificate.
* If it returns 1, civetweb assumes the calback already did this.
* If it returns -1, initializing ssl fails. */
if (callback_ret < 0) {
mg_cry(fc(ctx), "SSL callback returned error: %i", callback_ret);
return 0;
}
if (callback_ret > 0) {
if (pem != NULL) {
(void)SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
}
return 1;
}
/* Use some UID as session context ID. */
md5_init(&md5state);
md5_append(&md5state, (const md5_byte_t *)&now_rt, sizeof(now_rt));
clock_gettime(CLOCK_MONOTONIC, &now_mt);
md5_append(&md5state, (const md5_byte_t *)&now_mt, sizeof(now_mt));
md5_append(&md5state,
(const md5_byte_t *)ctx->config[LISTENING_PORTS],
strlen(ctx->config[LISTENING_PORTS]));
md5_append(&md5state, (const md5_byte_t *)ctx, sizeof(*ctx));
md5_finish(&md5state, ssl_context_id);
SSL_CTX_set_session_id_context(ctx->ssl_ctx,
(const unsigned char *)&ssl_context_id,
sizeof(ssl_context_id));
if (pem != NULL) {
if (!ssl_use_pem_file(ctx, pem)) {
return 0;
}
}
should_verify_peer =
(ctx->config[SSL_DO_VERIFY_PEER] != NULL)
&& (mg_strcasecmp(ctx->config[SSL_DO_VERIFY_PEER], "yes") == 0);
use_default_verify_paths =
(ctx->config[SSL_DEFAULT_VERIFY_PATHS] != NULL)
&& (mg_strcasecmp(ctx->config[SSL_DEFAULT_VERIFY_PATHS], "yes") == 0);
if (should_verify_peer) {
ca_path = ctx->config[SSL_CA_PATH];
ca_file = ctx->config[SSL_CA_FILE];
if (SSL_CTX_load_verify_locations(ctx->ssl_ctx, ca_file, ca_path)
!= 1) {
mg_cry(fc(ctx),
"SSL_CTX_load_verify_locations error: %s "
"ssl_verify_peer requires setting "
"either ssl_ca_path or ssl_ca_file. Is any of them "
"present in "
"the .conf file?",
ssl_error());
return 0;
}
SSL_CTX_set_verify(ctx->ssl_ctx,
SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
NULL);
if (use_default_verify_paths
&& SSL_CTX_set_default_verify_paths(ctx->ssl_ctx) != 1) {
mg_cry(fc(ctx),
"SSL_CTX_set_default_verify_paths error: %s",
ssl_error());
return 0;
}
if (ctx->config[SSL_VERIFY_DEPTH]) {
verify_depth = atoi(ctx->config[SSL_VERIFY_DEPTH]);
SSL_CTX_set_verify_depth(ctx->ssl_ctx, verify_depth);
}
}
if (ctx->config[SSL_CIPHER_LIST] != NULL) {
if (SSL_CTX_set_cipher_list(ctx->ssl_ctx, ctx->config[SSL_CIPHER_LIST])
!= 1) {
mg_cry(fc(ctx), "SSL_CTX_set_cipher_list error: %s", ssl_error());
}
}
return 1;
}
static void
uninitialize_ssl(struct mg_context *ctx)
{
int i;
(void)ctx;
if (mg_atomic_dec(&cryptolib_users) == 0) {
/* Shutdown according to
* https://wiki.openssl.org/index.php/Library_Initialization#Cleanup
* http://stackoverflow.com/questions/29845527/how-to-properly-uninitialize-openssl
*/
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_id_callback(NULL);
ENGINE_cleanup();
CONF_modules_unload(1);
ERR_free_strings();
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
ERR_remove_state(0);
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_destroy(&ssl_mutexes[i]);
}
mg_free(ssl_mutexes);
ssl_mutexes = NULL;
}
}
#endif /* !NO_SSL */
static int
set_gpass_option(struct mg_context *ctx)
{
if (ctx) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
mg_cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
return 0;
}
return 1;
}
return 0;
}
static int
set_acl_option(struct mg_context *ctx)
{
return check_acl(ctx, (uint32_t)0x7f000001UL) != -1;
}
static void
reset_per_request_attributes(struct mg_connection *conn)
{
if (!conn) {
return;
}
conn->path_info = NULL;
conn->num_bytes_sent = conn->consumed_content = 0;
conn->status_code = -1;
conn->is_chunked = 0;
conn->must_close = conn->request_len = conn->throttle = 0;
conn->request_info.content_length = -1;
conn->request_info.remote_user = NULL;
conn->request_info.request_method = NULL;
conn->request_info.request_uri = NULL;
conn->request_info.local_uri = NULL;
conn->request_info.uri = NULL; /* TODO: cleanup uri,
* local_uri and request_uri */
conn->request_info.http_version = NULL;
conn->request_info.num_headers = 0;
conn->data_len = 0;
conn->chunk_remainder = 0;
conn->internal_error = 0;
}
static int
set_sock_timeout(SOCKET sock, int milliseconds)
{
int r0 = 0, r1, r2;
#ifdef _WIN32
/* Windows specific */
DWORD tv = (DWORD)milliseconds;
#else
/* Linux, ... (not Windows) */
struct timeval tv;
/* TCP_USER_TIMEOUT/RFC5482 (http://tools.ietf.org/html/rfc5482):
* max. time waiting for the acknowledged of TCP data before the connection
* will be forcefully closed and ETIMEDOUT is returned to the application.
* If this option is not set, the default timeout of 20-30 minutes is used.
*/
/* #define TCP_USER_TIMEOUT (18) */
#if defined(TCP_USER_TIMEOUT)
unsigned int uto = (unsigned int)milliseconds;
r0 = setsockopt(sock, 6, TCP_USER_TIMEOUT, (const void *)&uto, sizeof(uto));
#endif
memset(&tv, 0, sizeof(tv));
tv.tv_sec = milliseconds / 1000;
tv.tv_usec = (milliseconds * 1000) % 1000000;
#endif /* _WIN32 */
r1 = setsockopt(
sock, SOL_SOCKET, SO_RCVTIMEO, (SOCK_OPT_TYPE)&tv, sizeof(tv));
r2 = setsockopt(
sock, SOL_SOCKET, SO_SNDTIMEO, (SOCK_OPT_TYPE)&tv, sizeof(tv));
return r0 || r1 || r2;
}
static int
set_tcp_nodelay(SOCKET sock, int nodelay_on)
{
if (setsockopt(sock,
IPPROTO_TCP,
TCP_NODELAY,
(SOCK_OPT_TYPE)&nodelay_on,
sizeof(nodelay_on)) != 0) {
/* Error */
return 1;
}
/* OK */
return 0;
}
static void
close_socket_gracefully(struct mg_connection *conn)
{
#if defined(_WIN32)
char buf[MG_BUF_LEN];
int n;
#endif
struct linger linger;
if (!conn) {
return;
}
/* Set linger option to avoid socket hanging out after close. This
* prevent
* ephemeral port exhaust problem under high QPS. */
linger.l_onoff = 1;
linger.l_linger = 1;
if (setsockopt(conn->client.sock,
SOL_SOCKET,
SO_LINGER,
(char *)&linger,
sizeof(linger)) != 0) {
mg_cry(conn,
"%s: setsockopt(SOL_SOCKET SO_LINGER) failed: %s",
__func__,
strerror(ERRNO));
}
/* Send FIN to the client */
shutdown(conn->client.sock, SHUT_WR);
set_non_blocking_mode(conn->client.sock);
#if defined(_WIN32)
/* Read and discard pending incoming data. If we do not do that and
* close
* the socket, the data in the send buffer may be discarded. This
* behaviour is seen on Windows, when client keeps sending data
* when server decides to close the connection; then when client
* does recv() it gets no data back. */
do {
n = pull(
NULL, conn, buf, sizeof(buf), 1E-10 /* TODO: allow 0 as timeout */);
} while (n > 0);
#endif
/* Now we know that our FIN is ACK-ed, safe to close */
closesocket(conn->client.sock);
conn->client.sock = INVALID_SOCKET;
}
static void
close_connection(struct mg_connection *conn)
{
if (!conn || !conn->ctx) {
return;
}
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
if (conn->lua_websocket_state) {
lua_websocket_close(conn, conn->lua_websocket_state);
conn->lua_websocket_state = NULL;
}
#endif
/* call the connection_close callback if assigned */
if ((conn->ctx->callbacks.connection_close != NULL)
&& (conn->ctx->context_type == 1)) {
conn->ctx->callbacks.connection_close(conn);
}
mg_lock_connection(conn);
conn->must_close = 1;
#ifndef NO_SSL
if (conn->ssl != NULL) {
/* Run SSL_shutdown twice to ensure completly close SSL connection
*/
SSL_shutdown(conn->ssl);
SSL_free(conn->ssl);
/* maybe not? CRYPTO_cleanup_all_ex_data(); */
/* see https://wiki.openssl.org/index.php/Talk:Library_Initialization */
ERR_remove_state(0);
conn->ssl = NULL;
}
#endif
if (conn->client.sock != INVALID_SOCKET) {
close_socket_gracefully(conn);
conn->client.sock = INVALID_SOCKET;
}
mg_unlock_connection(conn);
}
void
mg_close_connection(struct mg_connection *conn)
{
struct mg_context *client_ctx = NULL;
unsigned int i;
if (conn == NULL) {
return;
}
if (conn->ctx->context_type == 2) {
client_ctx = conn->ctx;
/* client context: loops must end */
conn->ctx->stop_flag = 1;
}
#ifndef NO_SSL
if (conn->client_ssl_ctx != NULL) {
SSL_CTX_free((SSL_CTX *)conn->client_ssl_ctx);
}
#endif
close_connection(conn);
if (client_ctx != NULL) {
/* join worker thread and free context */
for (i = 0; i < client_ctx->cfg_worker_threads; i++) {
if (client_ctx->workerthreadids[i] != 0) {
mg_join_thread(client_ctx->workerthreadids[i]);
}
}
mg_free(client_ctx->workerthreadids);
mg_free(client_ctx);
(void)pthread_mutex_destroy(&conn->mutex);
mg_free(conn);
}
}
static struct mg_connection *
mg_connect_client_impl(const struct mg_client_options *client_options,
int use_ssl,
char *ebuf,
size_t ebuf_len)
{
static struct mg_context fake_ctx;
struct mg_connection *conn = NULL;
SOCKET sock;
union usa sa;
if (!connect_socket(&fake_ctx,
client_options->host,
client_options->port,
use_ssl,
ebuf,
ebuf_len,
&sock,
&sa)) {
;
}
else if ((conn = (struct mg_connection *)
mg_calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"calloc(): %s",
strerror(ERRNO));
closesocket(sock);
#ifndef NO_SSL
}
else if (use_ssl
&& (conn->client_ssl_ctx = SSL_CTX_new(SSLv23_client_method()))
== NULL) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"SSL_CTX_new error");
closesocket(sock);
mg_free(conn);
conn = NULL;
#endif /* NO_SSL */
}
else {
#ifdef USE_IPV6
socklen_t len = (sa.sa.sa_family == AF_INET)
? sizeof(conn->client.rsa.sin)
: sizeof(conn->client.rsa.sin6);
struct sockaddr *psa =
(sa.sa.sa_family == AF_INET)
? (struct sockaddr *)&(conn->client.rsa.sin)
: (struct sockaddr *)&(conn->client.rsa.sin6);
#else
socklen_t len = sizeof(conn->client.rsa.sin);
struct sockaddr *psa = (struct sockaddr *)&(conn->client.rsa.sin);
#endif
conn->buf_size = MAX_REQUEST_SIZE;
conn->buf = (char *)(conn + 1);
conn->ctx = &fake_ctx;
conn->client.sock = sock;
conn->client.lsa = sa;
if (getsockname(sock, psa, &len) != 0) {
mg_cry(conn,
"%s: getsockname() failed: %s",
__func__,
strerror(ERRNO));
}
conn->client.is_ssl = use_ssl ? 1 : 0;
(void)pthread_mutex_init(&conn->mutex, &pthread_mutex_attr);
#ifndef NO_SSL
if (use_ssl) {
fake_ctx.ssl_ctx = conn->client_ssl_ctx;
/* TODO: Check ssl_verify_peer and ssl_ca_path here.
SSL_CTX_set_verify call is needed to switch off server
* certificate checking, which is off by default in OpenSSL and
on
* in yaSSL. */
// TODO: SSL_CTX_set_verify(conn->client_ssl_ctx,
// SSL_VERIFY_PEER,
// verify_ssl_server);
if (client_options->client_cert) {
if (!ssl_use_pem_file(&fake_ctx, client_options->client_cert)) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"Can not use SSL client certificate");
SSL_CTX_free(conn->client_ssl_ctx);
closesocket(sock);
mg_free(conn);
conn = NULL;
}
}
if (client_options->server_cert) {
SSL_CTX_load_verify_locations(conn->client_ssl_ctx,
client_options->server_cert,
NULL);
SSL_CTX_set_verify(conn->client_ssl_ctx, SSL_VERIFY_PEER, NULL);
}
else {
SSL_CTX_set_verify(conn->client_ssl_ctx, SSL_VERIFY_NONE, NULL);
}
if (!sslize(conn, conn->client_ssl_ctx, SSL_connect)) {
mg_snprintf(NULL,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"SSL connection error");
SSL_CTX_free(conn->client_ssl_ctx);
closesocket(sock);
mg_free(conn);
conn = NULL;
}
}
#endif
}
return conn;
}
CIVETWEB_API struct mg_connection *
mg_connect_client_secure(const struct mg_client_options *client_options,
char *error_buffer,
size_t error_buffer_size)
{
return mg_connect_client_impl(client_options,
1,
error_buffer,
error_buffer_size);
}
struct mg_connection *
mg_connect_client(const char *host,
int port,
int use_ssl,
char *error_buffer,
size_t error_buffer_size)
{
struct mg_client_options opts;
memset(&opts, 0, sizeof(opts));
opts.host = host;
opts.port = port;
return mg_connect_client_impl(&opts,
use_ssl,
error_buffer,
error_buffer_size);
}
static const struct {
const char *proto;
size_t proto_len;
unsigned default_port;
} abs_uri_protocols[] = { { "http://", 7, 80 },
{ "https://", 8, 443 },
{ "ws://", 5, 80 },
{ "wss://", 6, 443 },
{ NULL, 0, 0 } };
/* Check if the uri is valid.
* return 0 for invalid uri,
* return 1 for *,
* return 2 for relative uri,
* return 3 for absolute uri without port,
* return 4 for absolute uri with port */
static int
get_uri_type(const char *uri)
{
int i;
char *hostend, *portbegin, *portend;
unsigned long port;
/* According to the HTTP standard
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
* URI can be an asterisk (*) or should start with slash (relative uri),
* or it should start with the protocol (absolute uri). */
if (uri[0] == '*' && uri[1] == '\0') {
/* asterisk */
return 1;
}
if (uri[0] == '/') {
/* relative uri */
return 2;
}
/* It could be an absolute uri: */
/* This function only checks if the uri is valid, not if it is
* addressing the current server. So civetweb can also be used
* as a proxy server. */
for (i = 0; abs_uri_protocols[i].proto != NULL; i++) {
if (mg_strncasecmp(uri,
abs_uri_protocols[i].proto,
abs_uri_protocols[i].proto_len) == 0) {
hostend = (char*)strchr(uri + abs_uri_protocols[i].proto_len, '/');
if (!hostend) {
return 0;
}
portbegin = (char*)strchr(uri + abs_uri_protocols[i].proto_len, ':');
if (!portbegin) {
return 3;
}
port = strtoul(portbegin + 1, &portend, 10);
if ((portend != hostend) || !port || !is_valid_port(port)) {
return 0;
}
return 4;
}
}
return 0;
}
/* Return NULL or the relative uri at the current server */
static const char *
get_rel_url_at_current_server(const char *uri, const struct mg_connection *conn)
{
const char *server_domain;
size_t server_domain_len;
size_t request_domain_len = 0;
unsigned long port = 0;
int i;
const char *hostbegin = NULL;
const char *hostend = NULL;
const char *portbegin;
char *portend;
/* DNS is case insensitive, so use case insensitive string compare here
*/
server_domain = conn->ctx->config[AUTHENTICATION_DOMAIN];
if (!server_domain) {
return 0;
}
server_domain_len = strlen(server_domain);
if (!server_domain_len) {
return 0;
}
for (i = 0; abs_uri_protocols[i].proto != NULL; i++) {
if (mg_strncasecmp(uri,
abs_uri_protocols[i].proto,
abs_uri_protocols[i].proto_len) == 0) {
hostbegin = uri + abs_uri_protocols[i].proto_len;
hostend = strchr(hostbegin, '/');
if (!hostend) {
return 0;
}
portbegin = strchr(hostbegin, ':');
if ((!portbegin) || (portbegin > hostend)) {
port = abs_uri_protocols[i].default_port;
request_domain_len = (size_t)(hostend - hostbegin);
}
else {
port = strtoul(portbegin + 1, &portend, 10);
if ((portend != hostend) || !port || !is_valid_port(port)) {
return 0;
}
request_domain_len = (size_t)(portbegin - hostbegin);
}
/* protocol found, port set */
break;
}
}
if (!port) {
/* port remains 0 if the protocol is not found */
return 0;
}
#if defined(USE_IPV6)
if (conn->client.lsa.sa.sa_family == AF_INET6) {
if (ntohs(conn->client.lsa.sin6.sin6_port) != port) {
/* Request is directed to a different port */
return 0;
}
}
else
#endif
{
if (ntohs(conn->client.lsa.sin.sin_port) != port) {
/* Request is directed to a different port */
return 0;
}
}
if ((request_domain_len != server_domain_len)
|| (0 != memcmp(server_domain, hostbegin, server_domain_len))) {
/* Request is directed to another server */
return 0;
}
return hostend;
}
static int
getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len, int *err)
{
const char *cl;
if (ebuf_len > 0) {
ebuf[0] = '\0';
}
*err = 0;
reset_per_request_attributes(conn);
if (!conn) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Internal error");
*err = 500;
return 0;
}
/* Set the time the request was received. This value should be used for
* timeouts. */
clock_gettime(CLOCK_MONOTONIC, &(conn->req_time));
conn->request_len =
read_request(NULL, conn, conn->buf, conn->buf_size, &conn->data_len);
/* assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
*/
if (conn->request_len >= 0 && conn->data_len < conn->request_len) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Invalid request size");
*err = 500;
return 0;
}
if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Request Too Large");
*err = 413;
return 0;
}
else if (conn->request_len <= 0) {
if (conn->data_len > 0) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Client sent malformed request");
*err = 400;
}
else {
/* Server did not send anything -> just close the connection */
conn->must_close = 1;
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Client did not send a request");
*err = 0;
}
return 0;
}
else if (parse_http_message(conn->buf,
conn->buf_size,
&conn->request_info) <= 0) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Bad Request");
*err = 400;
return 0;
}
else {
/* Message is a valid request or response */
if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
/* Request/response has content length set */
char *endptr = NULL;
conn->content_len = strtoll(cl, &endptr, 10);
if (endptr == cl) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Bad Request");
*err = 411;
return 0;
}
/* Publish the content length back to the request info. */
conn->request_info.content_length = conn->content_len;
}
else if ((cl = get_header(&conn->request_info, "Transfer-Encoding"))
!= NULL
&& strcmp(cl, "chunked") == 0) {
conn->is_chunked = 1;
}
else if (!mg_strcasecmp(conn->request_info.request_method, "POST")
|| !mg_strcasecmp(conn->request_info.request_method,
"PUT")) {
/* POST or PUT request without content length set */
conn->content_len = -1;
}
else if (!mg_strncasecmp(conn->request_info.request_method,
"HTTP/",
5)) {
/* Response without content length set */
conn->content_len = -1;
}
else {
/* Other request */
conn->content_len = 0;
}
}
return 1;
}
int
mg_get_response(struct mg_connection *conn,
char *ebuf,
size_t ebuf_len,
int timeout)
{
if (conn) {
/* Implementation of API function for HTTP clients */
int err, ret;
struct mg_context *octx = conn->ctx;
struct mg_context rctx = *(conn->ctx);
char txt[32]; /* will not overflow */
if (timeout >= 0) {
mg_snprintf(conn, NULL, txt, sizeof(txt), "%i", timeout);
rctx.config[REQUEST_TIMEOUT] = txt;
set_sock_timeout(conn->client.sock, timeout);
}
else {
rctx.config[REQUEST_TIMEOUT] = NULL;
}
conn->ctx = &rctx;
ret = getreq(conn, ebuf, ebuf_len, &err);
conn->ctx = octx;
/* TODO: 1) uri is deprecated;
* 2) here, ri.uri is the http response code */
conn->request_info.uri = conn->request_info.request_uri;
/* TODO (mid): Define proper return values - maybe return length?
* For the first test use <0 for error and >0 for OK */
return (ret == 0) ? -1 : +1;
}
return -1;
}
struct mg_connection *
mg_download(const char *host,
int port,
int use_ssl,
char *ebuf,
size_t ebuf_len,
const char *fmt,
...)
{
struct mg_connection *conn;
va_list ap;
int i;
int reqerr;
va_start(ap, fmt);
ebuf[0] = '\0';
/* open a connection */
conn = mg_connect_client(host, port, use_ssl, ebuf, ebuf_len);
if (conn != NULL) {
i = mg_vprintf(conn, fmt, ap);
if (i <= 0) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
ebuf_len,
"%s",
"Error sending request");
}
else {
getreq(conn, ebuf, ebuf_len, &reqerr);
/* TODO: 1) uri is deprecated;
* 2) here, ri.uri is the http response code */
conn->request_info.uri = conn->request_info.request_uri;
}
}
/* if an error occured, close the connection */
if (ebuf[0] != '\0' && conn != NULL) {
mg_close_connection(conn);
conn = NULL;
}
va_end(ap);
return conn;
}
struct websocket_client_thread_data {
struct mg_connection *conn;
mg_websocket_data_handler data_handler;
mg_websocket_close_handler close_handler;
void *callback_data;
};
#if defined(USE_WEBSOCKET)
#ifdef _WIN32
static unsigned __stdcall websocket_client_thread(void *data)
#else
static void *
websocket_client_thread(void *data)
#endif
{
struct websocket_client_thread_data *cdata =
(struct websocket_client_thread_data *)data;
read_websocket(cdata->conn, cdata->data_handler, cdata->callback_data);
DEBUG_TRACE("%s", "Websocket client thread exited\n");
if (cdata->close_handler != NULL) {
cdata->close_handler(cdata->conn, cdata->callback_data);
}
mg_free((void *)cdata);
#ifdef _WIN32
return 0;
#else
return NULL;
#endif
}
#endif
struct mg_connection *
mg_connect_websocket_client(const char *host,
int port,
int use_ssl,
char *error_buffer,
size_t error_buffer_size,
const char *path,
const char *origin,
mg_websocket_data_handler data_func,
mg_websocket_close_handler close_func,
void *user_data)
{
struct mg_connection *conn = NULL;
#if defined(USE_WEBSOCKET)
struct mg_context *newctx = NULL;
struct websocket_client_thread_data *thread_data;
static const char *magic = "x3JJHMbDL1EzLkh9GBhXDw==";
static const char *handshake_req;
if (origin != NULL) {
handshake_req = "GET %s HTTP/1.1\r\n"
"Host: %s\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Key: %s\r\n"
"Sec-WebSocket-Version: 13\r\n"
"Origin: %s\r\n"
"\r\n";
}
else {
handshake_req = "GET %s HTTP/1.1\r\n"
"Host: %s\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Key: %s\r\n"
"Sec-WebSocket-Version: 13\r\n"
"\r\n";
}
/* Establish the client connection and request upgrade */
conn = mg_download(host,
port,
use_ssl,
error_buffer,
error_buffer_size,
handshake_req,
path,
host,
magic,
origin);
/* Connection object will be null if something goes wrong */
if (conn == NULL || (strcmp(conn->request_info.request_uri, "101") != 0)) {
if (!*error_buffer) {
/* if there is a connection, but it did not return 101,
* error_buffer is not yet set */
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
error_buffer,
error_buffer_size,
"Unexpected server reply");
}
DEBUG_TRACE("Websocket client connect error: %s\r\n", error_buffer);
if (conn != NULL) {
mg_free(conn);
conn = NULL;
}
return conn;
}
/* For client connections, mg_context is fake. Since we need to set a
* callback function, we need to create a copy and modify it. */
newctx = (struct mg_context *)mg_malloc(sizeof(struct mg_context));
memcpy(newctx, conn->ctx, sizeof(struct mg_context));
newctx->user_data = user_data;
newctx->context_type = 2; /* client context type */
newctx->cfg_worker_threads = 1; /* one worker thread will be created */
newctx->workerthreadids =
(pthread_t *)mg_calloc(newctx->cfg_worker_threads, sizeof(pthread_t));
conn->ctx = newctx;
thread_data = (struct websocket_client_thread_data *)
mg_calloc(sizeof(struct websocket_client_thread_data), 1);
thread_data->conn = conn;
thread_data->data_handler = data_func;
thread_data->close_handler = close_func;
thread_data->callback_data = NULL;
/* Start a thread to read the websocket client connection
* This thread will automatically stop when mg_disconnect is
* called on the client connection */
if (mg_start_thread_with_id(websocket_client_thread,
(void *)thread_data,
newctx->workerthreadids) != 0) {
mg_free((void *)thread_data);
mg_free((void *)newctx->workerthreadids);
mg_free((void *)newctx);
mg_free((void *)conn);
conn = NULL;
DEBUG_TRACE("%s",
"Websocket client connect thread could not be started\r\n");
}
#else
/* Appease "unused parameter" warnings */
(void)host;
(void)port;
(void)use_ssl;
(void)error_buffer;
(void)error_buffer_size;
(void)path;
(void)origin;
(void)user_data;
(void)data_func;
(void)close_func;
#endif
return conn;
}
static void
process_new_connection(struct mg_connection *conn)
{
if (conn && conn->ctx) {
struct mg_request_info *ri = &conn->request_info;
int keep_alive_enabled, keep_alive, discard_len;
char ebuf[100];
const char *hostend;
int reqerr, uri_type;
keep_alive_enabled =
!strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
/* Important: on new connection, reset the receiving buffer. Credit
* goes to crule42. */
conn->data_len = 0;
do {
if (!getreq(conn, ebuf, sizeof(ebuf), &reqerr)) {
/* The request sent by the client could not be understood by
* the server, or it was incomplete or a timeout. Send an
* error message and close the connection. */
if (reqerr > 0) {
/*assert(ebuf[0] != '\0');*/
send_http_error(conn, reqerr, "%s", ebuf);
}
}
else if (strcmp(ri->http_version, "1.0")
&& strcmp(ri->http_version, "1.1")) {
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
sizeof(ebuf),
"Bad HTTP version: [%s]",
ri->http_version);
send_http_error(conn, 505, "%s", ebuf);
}
if (ebuf[0] == '\0') {
uri_type = get_uri_type(conn->request_info.request_uri);
switch (uri_type) {
case 1:
/* Asterisk */
conn->request_info.local_uri = NULL;
break;
case 2:
/* relative uri */
conn->request_info.local_uri =
conn->request_info.request_uri;
break;
case 3:
case 4:
/* absolute uri (with/without port) */
hostend = get_rel_url_at_current_server(
conn->request_info.request_uri, conn);
if (hostend) {
conn->request_info.local_uri = hostend;
}
else {
conn->request_info.local_uri = NULL;
}
break;
default:
mg_snprintf(conn,
NULL, /* No truncation check for ebuf */
ebuf,
sizeof(ebuf),
"Invalid URI: [%s]",
ri->request_uri);
send_http_error(conn, 400, "%s", ebuf);
break;
}
/* TODO: cleanup uri, local_uri and request_uri */
conn->request_info.uri = conn->request_info.local_uri;
}
if (ebuf[0] == '\0') {
if (conn->request_info.local_uri) {
/* handle request to local server */
handle_request(conn);
if (conn->ctx->callbacks.end_request != NULL) {
conn->ctx->callbacks.end_request(conn,
conn->status_code);
}
log_access(conn);
}
else {
/* TODO: handle non-local request (PROXY) */
conn->must_close = 1;
}
}
else {
conn->must_close = 1;
}
if (ri->remote_user != NULL) {
mg_free((void *)ri->remote_user);
/* Important! When having connections with and without auth
* would cause double free and then crash */
ri->remote_user = NULL;
}
/* NOTE(lsm): order is important here. should_keep_alive() call
* is
* using parsed request, which will be invalid after memmove's
* below.
* Therefore, memorize should_keep_alive() result now for later
* use
* in loop exit condition. */
keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled
&& conn->content_len >= 0 && should_keep_alive(conn);
/* Discard all buffered data for this request */
discard_len = conn->content_len >= 0 && conn->request_len > 0
&& conn->request_len + conn->content_len
< (int64_t)conn->data_len
? (int)(conn->request_len + conn->content_len)
: conn->data_len;
/*assert(discard_len >= 0);*/
if (discard_len < 0)
break;
conn->data_len -= discard_len;
if (conn->data_len > 0) {
memmove(conn->buf,
conn->buf + discard_len,
(size_t)conn->data_len);
}
/* assert(conn->data_len >= 0); */
/* assert(conn->data_len <= conn->buf_size); */
if ((conn->data_len < 0) || (conn->data_len > conn->buf_size)) {
break;
}
} while (keep_alive);
}
}
/* Worker threads take accepted socket from the queue */
static int
consume_socket(struct mg_context *ctx, struct socket *sp)
{
#define QUEUE_SIZE(ctx) ((int)(ARRAY_SIZE(ctx->queue)))
if (!ctx) {
return 0;
}
(void)pthread_mutex_lock(&ctx->thread_mutex);
DEBUG_TRACE("%s", "going idle");
/* If the queue is empty, wait. We're idle at this point. */
while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
pthread_cond_wait(&ctx->sq_full, &ctx->thread_mutex);
}
/* If we're stopping, sq_head may be equal to sq_tail. */
if (ctx->sq_head > ctx->sq_tail) {
/* Copy socket from the queue and increment tail */
*sp = ctx->queue[ctx->sq_tail % QUEUE_SIZE(ctx)];
ctx->sq_tail++;
DEBUG_TRACE("grabbed socket %d, going busy", sp ? sp->sock : -1);
/* Wrap pointers if needed */
while (ctx->sq_tail > QUEUE_SIZE(ctx)) {
ctx->sq_tail -= QUEUE_SIZE(ctx);
ctx->sq_head -= QUEUE_SIZE(ctx);
}
}
(void)pthread_cond_signal(&ctx->sq_empty);
(void)pthread_mutex_unlock(&ctx->thread_mutex);
return !ctx->stop_flag;
#undef QUEUE_SIZE
}
static void *
worker_thread_run(void *thread_func_param)
{
struct mg_context *ctx = (struct mg_context *)thread_func_param;
struct mg_connection *conn;
struct mg_workerTLS tls;
#if defined(MG_LEGACY_INTERFACE)
uint32_t addr;
#endif
mg_set_thread_name("worker");
tls.is_master = 0;
tls.thread_idx = (unsigned)mg_atomic_inc(&thread_idx_max);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
tls.pthread_cond_helper_mutex = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
conn =
(struct mg_connection *)mg_calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
if (conn == NULL) {
mg_cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
}
else {
pthread_setspecific(sTlsKey, &tls);
conn->buf_size = MAX_REQUEST_SIZE;
conn->buf = (char *)(conn + 1);
conn->ctx = ctx;
conn->request_info.user_data = ctx->user_data;
/* Allocate a mutex for this connection to allow communication both
* within the request handler and from elsewhere in the application
*/
(void)pthread_mutex_init(&conn->mutex, &pthread_mutex_attr);
/* Call consume_socket() even when ctx->stop_flag > 0, to let it
* signal sq_empty condvar to wake up the master waiting in
* produce_socket() */
while (consume_socket(ctx, &conn->client)) {
conn->conn_birth_time = time(NULL);
/* Fill in IP, port info early so even if SSL setup below fails,
* error handler would have the corresponding info.
* Thanks to Johannes Winkelmann for the patch.
*/
#if defined(USE_IPV6)
if (conn->client.rsa.sa.sa_family == AF_INET6) {
conn->request_info.remote_port =
ntohs(conn->client.rsa.sin6.sin6_port);
}
else
#endif
{
conn->request_info.remote_port =
ntohs(conn->client.rsa.sin.sin_port);
}
sockaddr_to_string(conn->request_info.remote_addr,
sizeof(conn->request_info.remote_addr),
&conn->client.rsa);
#if defined(MG_LEGACY_INTERFACE)
/* This legacy interface only works for the IPv4 case */
addr = ntohl(conn->client.rsa.sin.sin_addr.s_addr);
memcpy(&conn->request_info.remote_ip, &addr, 4);
#endif
conn->request_info.is_ssl = conn->client.is_ssl;
if (!conn->client.is_ssl
#ifndef NO_SSL
|| sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
#endif
) {
process_new_connection(conn);
}
close_connection(conn);
}
}
/* Signal master that we're done with connection and exiting */
(void)pthread_mutex_lock(&ctx->thread_mutex);
ctx->running_worker_threads--;
(void)pthread_cond_signal(&ctx->thread_cond);
/* assert(ctx->running_worker_threads >= 0); */
(void)pthread_mutex_unlock(&ctx->thread_mutex);
pthread_setspecific(sTlsKey, NULL);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
CloseHandle(tls.pthread_cond_helper_mutex);
#endif
pthread_mutex_destroy(&conn->mutex);
mg_free(conn);
DEBUG_TRACE("%s", "exiting");
return NULL;
}
/* Threads have different return types on Windows and Unix. */
#ifdef _WIN32
static unsigned __stdcall mg_worker_thread(void *thread_func_param)
{
worker_thread_run(thread_func_param);
return 0;
}
#else
static void *
mg_worker_thread(void *thread_func_param)
{
worker_thread_run(thread_func_param);
return NULL;
}
#endif /* _WIN32 */
/* Master thread adds accepted socket to a queue */
static void
produce_socket(struct mg_context *ctx, const struct socket *sp)
{
#define QUEUE_SIZE(ctx) ((int)(ARRAY_SIZE(ctx->queue)))
if (!ctx) {
return;
}
(void)pthread_mutex_lock(&ctx->thread_mutex);
/* If the queue is full, wait */
while (ctx->stop_flag == 0
&& ctx->sq_head - ctx->sq_tail >= QUEUE_SIZE(ctx)) {
(void)pthread_cond_wait(&ctx->sq_empty, &ctx->thread_mutex);
}
if (ctx->sq_head - ctx->sq_tail < QUEUE_SIZE(ctx)) {
/* Copy socket to the queue and increment head */
ctx->queue[ctx->sq_head % QUEUE_SIZE(ctx)] = *sp;
ctx->sq_head++;
DEBUG_TRACE("queued socket %d", sp ? sp->sock : -1);
}
(void)pthread_cond_signal(&ctx->sq_full);
(void)pthread_mutex_unlock(&ctx->thread_mutex);
#undef QUEUE_SIZE
}
static void
accept_new_connection(const struct socket *listener, struct mg_context *ctx)
{
struct socket so;
char src_addr[IP_ADDR_STR_LEN];
socklen_t len = sizeof(so.rsa);
int on = 1;
int timeout;
if (!listener) {
return;
}
if ((so.sock = accept(listener->sock, &so.rsa.sa, &len))
== INVALID_SOCKET) {
}
else if (!check_acl(ctx, ntohl(*(uint32_t *)&so.rsa.sin.sin_addr))) {
sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
mg_cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
closesocket(so.sock);
so.sock = INVALID_SOCKET;
}
else {
/* Put so socket structure into the queue */
DEBUG_TRACE("Accepted socket %d", (int)so.sock);
set_close_on_exec(so.sock, fc(ctx));
so.is_ssl = listener->is_ssl;
so.ssl_redir = listener->ssl_redir;
if (getsockname(so.sock, &so.lsa.sa, &len) != 0) {
mg_cry(fc(ctx),
"%s: getsockname() failed: %s",
__func__,
strerror(ERRNO));
}
/* Set TCP keep-alive. This is needed because if HTTP-level
* keep-alive
* is enabled, and client resets the connection, server won't get
* TCP FIN or RST and will keep the connection open forever. With
* TCP keep-alive, next keep-alive handshake will figure out that
* the client is down and will close the server end.
* Thanks to Igor Klopov who suggested the patch. */
if (setsockopt(so.sock,
SOL_SOCKET,
SO_KEEPALIVE,
(SOCK_OPT_TYPE)&on,
sizeof(on)) != 0) {
mg_cry(fc(ctx),
"%s: setsockopt(SOL_SOCKET SO_KEEPALIVE) failed: %s",
__func__,
strerror(ERRNO));
}
/* Disable TCP Nagle's algorithm. Normally TCP packets are coalesced
* to effectively fill up the underlying IP packet payload and reduce
* the overhead of sending lots of small buffers. However this hurts
* the server's throughput (ie. operations per second) when HTTP 1.1
* persistent connections are used and the responses are relatively
* small (eg. less than 1400 bytes).
*/
if ((ctx != NULL) && (ctx->config[CONFIG_TCP_NODELAY] != NULL)
&& (!strcmp(ctx->config[CONFIG_TCP_NODELAY], "1"))) {
if (set_tcp_nodelay(so.sock, 1) != 0) {
mg_cry(fc(ctx),
"%s: setsockopt(IPPROTO_TCP TCP_NODELAY) failed: %s",
__func__,
strerror(ERRNO));
}
}
if (ctx && ctx->config[REQUEST_TIMEOUT]) {
timeout = atoi(ctx->config[REQUEST_TIMEOUT]);
}
else {
timeout = -1;
}
/* Set socket timeout to the given value, but not more than a
* a certain limit (SOCKET_TIMEOUT_QUANTUM, default 10 seconds),
* so the server can exit after that time if requested. */
if ((timeout > 0) && (timeout < SOCKET_TIMEOUT_QUANTUM)) {
set_sock_timeout(so.sock, timeout);
}
else {
set_sock_timeout(so.sock, SOCKET_TIMEOUT_QUANTUM);
}
produce_socket(ctx, &so);
}
}
static void
master_thread_run(void *thread_func_param)
{
struct mg_context *ctx = (struct mg_context *)thread_func_param;
struct mg_workerTLS tls;
struct pollfd *pfd;
unsigned int i;
unsigned int workerthreadcount;
if (!ctx) {
return;
}
mg_set_thread_name("master");
/* Increase priority of the master thread */
#if defined(_WIN32)
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
#elif defined(USE_MASTER_THREAD_PRIORITY)
int min_prio = sched_get_priority_min(SCHED_RR);
int max_prio = sched_get_priority_max(SCHED_RR);
if ((min_prio >= 0) && (max_prio >= 0)
&& ((USE_MASTER_THREAD_PRIORITY) <= max_prio)
&& ((USE_MASTER_THREAD_PRIORITY) >= min_prio)) {
struct sched_param sched_param = { 0 };
sched_param.sched_priority = (USE_MASTER_THREAD_PRIORITY);
pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
}
#endif
/* Initialize thread local storage */
#if defined(_WIN32) && !defined(__SYMBIAN32__)
tls.pthread_cond_helper_mutex = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
tls.is_master = 1;
pthread_setspecific(sTlsKey, &tls);
/* Server starts *now* */
ctx->start_time = time(NULL);
/* Allocate memory for the listening sockets, and start the server */
pfd =
(struct pollfd *)mg_calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
while (pfd != NULL && ctx->stop_flag == 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
pfd[i].fd = ctx->listening_sockets[i].sock;
pfd[i].events = POLLIN;
}
if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
/* NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
* successful poll, and POLLIN is defined as
* (POLLRDNORM | POLLRDBAND)
* Therefore, we're checking pfd[i].revents & POLLIN, not
* pfd[i].revents == POLLIN. */
if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
accept_new_connection(&ctx->listening_sockets[i], ctx);
}
}
}
}
mg_free(pfd);
DEBUG_TRACE("%s", "stopping workers");
/* Stop signal received: somebody called mg_stop. Quit. */
close_all_listening_sockets(ctx);
/* Wakeup workers that are waiting for connections to handle. */
pthread_cond_broadcast(&ctx->sq_full);
/* Wait until all threads finish */
(void)pthread_mutex_lock(&ctx->thread_mutex);
while (ctx->running_worker_threads > 0) {
(void)pthread_cond_wait(&ctx->thread_cond, &ctx->thread_mutex);
}
(void)pthread_mutex_unlock(&ctx->thread_mutex);
/* Join all worker threads to avoid leaking threads. */
workerthreadcount = ctx->cfg_worker_threads;
for (i = 0; i < workerthreadcount; i++) {
if (ctx->workerthreadids[i] != 0) {
mg_join_thread(ctx->workerthreadids[i]);
}
}
#if !defined(NO_SSL)
if (ctx->ssl_ctx != NULL) {
uninitialize_ssl(ctx);
}
#endif
DEBUG_TRACE("%s", "exiting");
#if defined(_WIN32) && !defined(__SYMBIAN32__)
CloseHandle(tls.pthread_cond_helper_mutex);
#endif
pthread_setspecific(sTlsKey, NULL);
/* Signal mg_stop() that we're done.
* WARNING: This must be the very last thing this
* thread does, as ctx becomes invalid after this line. */
ctx->stop_flag = 2;
}
/* Threads have different return types on Windows and Unix. */
#ifdef _WIN32
static unsigned __stdcall master_thread(void *thread_func_param)
{
master_thread_run(thread_func_param);
return 0;
}
#else
static void *
master_thread(void *thread_func_param)
{
master_thread_run(thread_func_param);
return NULL;
}
#endif /* _WIN32 */
static void
free_context(struct mg_context *ctx)
{
int i;
struct mg_handler_info *tmp_rh;
if (ctx == NULL) {
return;
}
if (ctx->callbacks.exit_context) {
ctx->callbacks.exit_context(ctx);
}
/* All threads exited, no sync is needed. Destroy thread mutex and
* condvars
*/
(void)pthread_mutex_destroy(&ctx->thread_mutex);
(void)pthread_cond_destroy(&ctx->thread_cond);
(void)pthread_cond_destroy(&ctx->sq_empty);
(void)pthread_cond_destroy(&ctx->sq_full);
/* Destroy other context global data structures mutex */
(void)pthread_mutex_destroy(&ctx->nonce_mutex);
#if defined(USE_TIMERS)
timers_exit(ctx);
#endif
/* Deallocate config parameters */
for (i = 0; i < NUM_OPTIONS; i++) {
if (ctx->config[i] != NULL) {
#if defined(_MSC_VER)
#pragma warning(suppress : 6001)
#endif
mg_free(ctx->config[i]);
}
}
/* Deallocate request handlers */
while (ctx->handlers) {
tmp_rh = ctx->handlers;
ctx->handlers = tmp_rh->next;
mg_free(tmp_rh->uri);
mg_free(tmp_rh);
}
#ifndef NO_SSL
/* Deallocate SSL context */
if (ctx->ssl_ctx != NULL) {
SSL_CTX_free(ctx->ssl_ctx);
}
#endif /* !NO_SSL */
/* Deallocate worker thread ID array */
if (ctx->workerthreadids != NULL) {
mg_free(ctx->workerthreadids);
}
/* Deallocate the tls variable */
if (mg_atomic_dec(&sTlsInit) == 0) {
#if defined(_WIN32) && !defined(__SYMBIAN32__)
DeleteCriticalSection(&global_log_file_lock);
#endif /* _WIN32 && !__SYMBIAN32__ */
#if !defined(_WIN32)
pthread_mutexattr_destroy(&pthread_mutex_attr);
#endif
pthread_key_delete(sTlsKey);
}
/* deallocate system name string */
mg_free(ctx->systemName);
/* Deallocate context itself */
mg_free(ctx);
}
void
mg_stop(struct mg_context *ctx)
{
pthread_t mt;
if (!ctx) {
return;
}
/* We don't use a lock here. Calling mg_stop with the same ctx from
* two threads is not allowed. */
mt = ctx->masterthreadid;
if (mt == 0) {
return;
}
ctx->masterthreadid = 0;
ctx->stop_flag = 1;
/* Wait until mg_fini() stops */
while (ctx->stop_flag != 2) {
(void)mg_sleep(10);
}
mg_join_thread(mt);
free_context(ctx);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
(void)WSACleanup();
#endif /* _WIN32 && !__SYMBIAN32__ */
}
static void
get_system_name(char **sysName)
{
#if defined(_WIN32)
#if !defined(__SYMBIAN32__)
char name[128];
DWORD dwVersion = 0;
DWORD dwMajorVersion = 0;
DWORD dwMinorVersion = 0;
DWORD dwBuild = 0;
#ifdef _MSC_VER
#pragma warning(push)
// GetVersion was declared deprecated
#pragma warning(disable : 4996)
#endif
dwVersion = GetVersion();
#ifdef _MSC_VER
#pragma warning(pop)
#endif
dwMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
dwMinorVersion = (DWORD)(HIBYTE(LOWORD(dwVersion)));
dwBuild = ((dwVersion < 0x80000000) ? (DWORD)(HIWORD(dwVersion)) : 0);
(void)dwBuild;
sprintf(name,
"Windows %u.%u",
(unsigned)dwMajorVersion,
(unsigned)dwMinorVersion);
*sysName = mg_strdup(name);
#else
*sysName = mg_strdup("Symbian");
#endif
#else
struct utsname name;
memset(&name, 0, sizeof(name));
uname(&name);
*sysName = mg_strdup(name.sysname);
#endif
}
struct mg_context *
mg_start(const struct mg_callbacks *callbacks,
void *user_data,
const char **options)
{
struct mg_context *ctx;
const char *name, *value, *default_value;
int idx, ok, workerthreadcount;
unsigned int i;
void(*exit_callback)(const struct mg_context *ctx) = 0;
struct mg_workerTLS tls;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
WSADATA data;
WSAStartup(MAKEWORD(2, 2), &data);
#endif /* _WIN32 && !__SYMBIAN32__ */
/* Allocate context and initialize reasonable general case defaults. */
if ((ctx = (struct mg_context *)mg_calloc(1, sizeof(*ctx))) == NULL) {
return NULL;
}
/* Random number generator will initialize at the first call */
ctx->auth_nonce_mask =
(uint64_t)get_random() ^ (uint64_t)(ptrdiff_t)(options);
if (mg_atomic_inc(&sTlsInit) == 1) {
#if defined(_WIN32) && !defined(__SYMBIAN32__)
InitializeCriticalSection(&global_log_file_lock);
#endif /* _WIN32 && !__SYMBIAN32__ */
#if !defined(_WIN32)
pthread_mutexattr_init(&pthread_mutex_attr);
pthread_mutexattr_settype(&pthread_mutex_attr, PTHREAD_MUTEX_RECURSIVE);
#endif
if (0 != pthread_key_create(&sTlsKey, tls_dtor)) {
/* Fatal error - abort start. However, this situation should
* never
* occur in practice. */
mg_atomic_dec(&sTlsInit);
mg_cry(fc(ctx), "Cannot initialize thread local storage");
mg_free(ctx);
return NULL;
}
}
else {
/* TODO (low): istead of sleeping, check if sTlsKey is already
* initialized. */
mg_sleep(1);
}
tls.is_master = -1;
tls.thread_idx = (unsigned)mg_atomic_inc(&thread_idx_max);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
tls.pthread_cond_helper_mutex = NULL;
#endif
pthread_setspecific(sTlsKey, &tls);
ok = 0 == pthread_mutex_init(&ctx->thread_mutex, &pthread_mutex_attr);
ok &= 0 == pthread_cond_init(&ctx->thread_cond, NULL);
ok &= 0 == pthread_cond_init(&ctx->sq_empty, NULL);
ok &= 0 == pthread_cond_init(&ctx->sq_full, NULL);
ok &= 0 == pthread_mutex_init(&ctx->nonce_mutex, &pthread_mutex_attr);
if (!ok) {
/* Fatal error - abort start. However, this situation should never
* occur in practice. */
mg_cry(fc(ctx), "Cannot initialize thread synchronization objects");
mg_free(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
if (callbacks) {
ctx->callbacks = *callbacks;
exit_callback = callbacks->exit_context;
ctx->callbacks.exit_context = 0;
}
ctx->user_data = user_data;
ctx->handlers = NULL;
#if defined(USE_LUA) && defined(USE_WEBSOCKET)
ctx->shared_lua_websockets = 0;
#endif
while (options && (name = *options++) != NULL) {
if ((idx = get_option_index(name)) == -1) {
mg_cry(fc(ctx), "Invalid option: %s", name);
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
else if ((value = *options++) == NULL) {
mg_cry(fc(ctx), "%s: option value cannot be NULL", name);
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
if (ctx->config[idx] != NULL) {
mg_cry(fc(ctx), "warning: %s: duplicate option", name);
mg_free(ctx->config[idx]);
}
ctx->config[idx] = mg_strdup(value);
DEBUG_TRACE("[%s] -> [%s]", name, value);
}
/* Set default value if needed */
for (i = 0; config_options[i].name != NULL; i++) {
default_value = config_options[i].default_value;
if (ctx->config[i] == NULL && default_value != NULL) {
ctx->config[i] = mg_strdup(default_value);
}
}
#if defined(NO_FILES)
if (ctx->config[DOCUMENT_ROOT] != NULL) {
mg_cry(fc(ctx), "%s", "Document root must not be set");
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
#endif
get_system_name(&ctx->systemName);
/* NOTE(lsm): order is important here. SSL certificates must
* be initialized before listening ports. UID must be set last. */
if (!set_gpass_option(ctx) ||
#if !defined(NO_SSL)
!set_ssl_option(ctx) ||
#endif
!set_ports_option(ctx) ||
#if !defined(_WIN32)
!set_uid_option(ctx) ||
#endif
!set_acl_option(ctx)) {
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
#if !defined(_WIN32) && !defined(__SYMBIAN32__)
/* Ignore SIGPIPE signal, so if browser cancels the request, it
* won't kill the whole process. */
(void)signal(SIGPIPE, SIG_IGN);
#endif /* !_WIN32 && !__SYMBIAN32__ */
workerthreadcount = atoi(ctx->config[NUM_THREADS]);
if (workerthreadcount > MAX_WORKER_THREADS) {
mg_cry(fc(ctx), "Too many worker threads");
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
if (workerthreadcount > 0) {
ctx->cfg_worker_threads = ((unsigned int)(workerthreadcount));
ctx->workerthreadids =
(pthread_t *)mg_calloc(ctx->cfg_worker_threads, sizeof(pthread_t));
if (ctx->workerthreadids == NULL) {
mg_cry(fc(ctx), "Not enough memory for worker thread ID array");
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
}
#if defined(USE_TIMERS)
if (timers_init(ctx) != 0) {
mg_cry(fc(ctx), "Error creating timers");
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
#endif
/* Context has been created - init user libraries */
if (ctx->callbacks.init_context) {
ctx->callbacks.init_context(ctx);
}
ctx->callbacks.exit_context = exit_callback;
ctx->context_type = 1; /* server context */
/* Start master (listening) thread */
mg_start_thread_with_id(master_thread, ctx, &ctx->masterthreadid);
/* Start worker threads */
for (i = 0; i < ctx->cfg_worker_threads; i++) {
(void)pthread_mutex_lock(&ctx->thread_mutex);
ctx->running_worker_threads++;
(void)pthread_mutex_unlock(&ctx->thread_mutex);
if (mg_start_thread_with_id(mg_worker_thread,
ctx,
&ctx->workerthreadids[i]) != 0) {
(void)pthread_mutex_lock(&ctx->thread_mutex);
ctx->running_worker_threads--;
(void)pthread_mutex_unlock(&ctx->thread_mutex);
if (i > 0) {
mg_cry(fc(ctx),
"Cannot start worker thread %i: error %ld",
i + 1,
(long)ERRNO);
}
else {
mg_cry(fc(ctx),
"Cannot create threads: error %ld",
(long)ERRNO);
free_context(ctx);
pthread_setspecific(sTlsKey, NULL);
return NULL;
}
break;
}
}
pthread_setspecific(sTlsKey, NULL);
return ctx;
}
/* Feature check API function */
unsigned
mg_check_feature(unsigned feature)
{
static const unsigned feature_set = 0
/* Set bits for available features according to API documentation.
* This bit mask is created at compile time, according to the active
* preprocessor defines. It is a single const value at runtime. */
#if !defined(NO_FILES)
| 1
#endif
#if !defined(NO_SSL)
| 2
#endif
#if !defined(NO_CGI)
| 4
#endif
#if defined(USE_IPV6)
| 8
#endif
#if defined(USE_WEBSOCKET)
| 16
#endif
#if defined(USE_LUA)
| 32
#endif
#if defined(USE_DUKTAPE)
| 64
#endif
/* Set some extra bits not defined in the API documentation.
* These bits may change without further notice. */
#if defined(MG_LEGACY_INTERFACE)
| 128
#endif
#if defined(MEMORY_DEBUGGING)
| 256
#endif
#if defined(USE_TIMERS)
| 512
#endif
#if !defined(NO_NONCE_CHECK)
| 1024
#endif
#if !defined(NO_POPEN)
| 2048
#endif
;
return (feature & feature_set);
}
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