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wine/scheduler/client.c
Alexandre Julliard d549f6909e Use a separate FIFO pair for server requests that don't need to pass a 
file descriptor.
Associate file descriptors with handles on the server side so that we
don't need to pass the fd every time the client wants to use it.
2000-12-22 02:04:15 +00:00

677 lines
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C
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/*
* Client part of the client/server communication
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <sys/un.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdarg.h>
#include "wine/port.h"
#include "thread.h"
#include "server.h"
#include "winerror.h"
#include "options.h"
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
#define CONFDIR "/.wine" /* directory for Wine config relative to $HOME */
#define SERVERDIR "/wineserver-" /* server socket directory (hostname appended) */
#define SOCKETNAME "socket" /* name of the socket file */
#undef server_alloc_req
/* data structure used to pass an fd with sendmsg/recvmsg */
struct cmsg_fd
{
int len; /* sizeof structure */
int level; /* SOL_SOCKET */
int type; /* SCM_RIGHTS */
int fd; /* fd to pass */
};
static void *boot_thread_id;
/* die on a fatal error; use only during initialization */
static void fatal_error( const char *err, ... ) WINE_NORETURN;
static void fatal_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
va_end( args );
exit(1);
}
/* die on a fatal error; use only during initialization */
static void fatal_perror( const char *err, ... ) WINE_NORETURN;
static void fatal_perror( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
perror( " " );
va_end( args );
exit(1);
}
/***********************************************************************
* server_protocol_error
*/
void server_protocol_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "Client protocol error:%p: ", NtCurrentTeb()->tid );
vfprintf( stderr, err, args );
va_end( args );
SYSDEPS_ExitThread(1);
}
/***********************************************************************
* server_perror
*/
static void server_perror( const char *err )
{
fprintf( stderr, "Client protocol error:%p: ", NtCurrentTeb()->tid );
perror( err );
SYSDEPS_ExitThread(1);
}
/***********************************************************************
* __wine_server_exception_handler
*/
DWORD __wine_server_exception_handler( PEXCEPTION_RECORD record, EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **pdispatcher )
{
struct __server_exception_frame *server_frame = (struct __server_exception_frame *)frame;
if ((record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
*NtCurrentTeb()->buffer_info = server_frame->info;
return ExceptionContinueSearch;
}
/***********************************************************************
* wine_server_alloc_req
*/
void *wine_server_alloc_req( size_t fixed_size, size_t var_size )
{
unsigned int pos = NtCurrentTeb()->buffer_info->cur_pos;
union generic_request *req = (union generic_request *)((char *)NtCurrentTeb()->buffer + pos);
size_t size = sizeof(*req) + var_size;
assert( fixed_size <= sizeof(*req) );
assert( var_size <= REQUEST_MAX_VAR_SIZE );
if ((char *)req + size > (char *)NtCurrentTeb()->buffer_info)
server_protocol_error( "buffer overflow %d bytes\n",
(char *)req + size - (char *)NtCurrentTeb()->buffer_info );
NtCurrentTeb()->buffer_info->cur_pos = pos + size;
req->header.fixed_size = fixed_size;
req->header.var_size = var_size;
return req;
}
/***********************************************************************
* send_request
*
* Send a request to the server.
*/
static void send_request( enum request req, struct request_header *header )
{
header->req = req;
NtCurrentTeb()->buffer_info->cur_req = (char *)header - (char *)NtCurrentTeb()->buffer;
/* write a single byte; the value is ignored anyway */
if (write( NtCurrentTeb()->request_fd, header, 1 ) == -1)
{
if (errno == EPIPE) SYSDEPS_ExitThread(0);
server_perror( "sendmsg" );
}
}
/***********************************************************************
* send_request_fd
*
* Send a request to the server, passing a file descriptor.
*/
static void send_request_fd( enum request req, struct request_header *header, int fd )
{
#ifndef HAVE_MSGHDR_ACCRIGHTS
struct cmsg_fd cmsg;
#endif
struct msghdr msghdr;
struct iovec vec;
/* write a single byte; the value is ignored anyway */
vec.iov_base = (void *)header;
vec.iov_len = 1;
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_ACCRIGHTS */
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = fd;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
header->req = req;
if (sendmsg( NtCurrentTeb()->socket, &msghdr, 0 ) == -1)
{
if (errno == EPIPE) SYSDEPS_ExitThread(0);
server_perror( "sendmsg" );
}
}
/***********************************************************************
* wait_reply
*
* Wait for a reply from the server.
*/
static void wait_reply(void)
{
int ret;
char dummy[1];
for (;;)
{
if ((ret = read( NtCurrentTeb()->reply_fd, dummy, 1 )) > 0) return;
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_perror("read");
}
/* the server closed the connection; time to die... */
SYSDEPS_ExitThread(0);
}
/***********************************************************************
* wine_server_call
*
* Perform a server call.
*/
unsigned int wine_server_call( enum request req )
{
void *req_ptr = get_req_buffer();
send_request( req, req_ptr );
wait_reply();
return ((struct request_header *)req_ptr)->error;
}
/***********************************************************************
* server_call_fd
*
* Perform a server call, passing a file descriptor.
*/
unsigned int server_call_fd( enum request req, int fd_out )
{
unsigned int res;
void *req_ptr = get_req_buffer();
send_request_fd( req, req_ptr, fd_out );
wait_reply();
if ((res = ((struct request_header *)req_ptr)->error))
SetLastError( RtlNtStatusToDosError(res) );
return res; /* error code */
}
/***********************************************************************
* set_handle_fd
*
* Store the fd for a given handle in the server
*/
static int set_handle_fd( int handle, int fd )
{
SERVER_START_REQ
{
struct set_handle_info_request *req = wine_server_alloc_req( sizeof(*req), 0 );
req->handle = handle;
req->flags = 0;
req->mask = 0;
req->fd = fd;
if (!server_call( REQ_SET_HANDLE_INFO ))
{
if (req->cur_fd != fd)
{
/* someone was here before us */
close( fd );
fd = req->cur_fd;
}
else fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
}
else
{
close( fd );
fd = -1;
}
}
SERVER_END_REQ;
return fd;
}
/***********************************************************************
* wine_server_recv_fd
*
* Receive a file descriptor passed from the server.
* The file descriptor must be closed after use.
*/
int wine_server_recv_fd( int handle, int cache )
{
struct iovec vec;
int ret, fd, server_handle;
#ifdef HAVE_MSGHDR_ACCRIGHTS
struct msghdr msghdr;
fd = -1;
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_ACCRIGHTS */
struct msghdr msghdr;
struct cmsg_fd cmsg;
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = -1;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
vec.iov_base = (void *)&server_handle;
vec.iov_len = sizeof(server_handle);
for (;;)
{
if ((ret = recvmsg( NtCurrentTeb()->socket, &msghdr, 0 )) > 0)
{
#ifndef HAVE_MSGHDR_ACCRIGHTS
fd = cmsg.fd;
#endif
if (handle != server_handle)
server_protocol_error( "recv_fd: got handle %d, expected %d\n",
server_handle, handle );
if (cache)
{
fd = set_handle_fd( handle, fd );
if (fd != -1) fd = dup(fd);
}
return fd;
}
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_perror("recvmsg");
}
/* the server closed the connection; time to die... */
SYSDEPS_ExitThread(0);
}
/***********************************************************************
* get_config_dir
*
* Return the configuration directory ($WINEPREFIX or $HOME/.wine)
*/
const char *get_config_dir(void)
{
static char *confdir;
if (!confdir)
{
const char *prefix = getenv( "WINEPREFIX" );
if (prefix)
{
int len = strlen(prefix);
if (!(confdir = strdup( prefix ))) fatal_error( "out of memory\n" );
if (len > 1 && confdir[len-1] == '/') confdir[len-1] = 0;
}
else
{
const char *home = getenv( "HOME" );
if (!home)
{
struct passwd *pwd = getpwuid( getuid() );
if (!pwd) fatal_error( "could not find your home directory\n" );
home = pwd->pw_dir;
}
if (!(confdir = malloc( strlen(home) + strlen(CONFDIR) + 1 )))
fatal_error( "out of memory\n" );
strcpy( confdir, home );
strcat( confdir, CONFDIR );
}
mkdir( confdir, 0755 ); /* just in case */
}
return confdir;
}
/***********************************************************************
* start_server
*
* Start a new wine server.
*/
static void start_server( const char *oldcwd )
{
static int started; /* we only try once */
char *path, *p;
if (!started)
{
int status;
int pid = fork();
if (pid == -1) fatal_perror( "fork" );
if (!pid)
{
/* if server is explicitly specified, use this */
if ((p = getenv("WINESERVER")))
{
execl( p, "wineserver", NULL );
fatal_perror( "could not exec the server '%s'\n"
" specified in the WINESERVER environment variable", p );
}
/* first try the installation dir */
execl( BINDIR "/wineserver", "wineserver", NULL );
/* now try the dir we were launched from */
if (full_argv0)
{
if (!(path = malloc( strlen(full_argv0) + 20 )))
fatal_error( "out of memory\n" );
if ((p = strrchr( strcpy( path, full_argv0 ), '/' )))
{
strcpy( p, "/wineserver" );
execl( path, "wineserver", NULL );
strcpy( p, "/server/wineserver" );
execl( path, "wineserver", NULL );
}
free(path);
}
/* now try the path */
execlp( "wineserver", "wineserver", NULL );
/* and finally the current dir */
if (!(path = malloc( strlen(oldcwd) + 20 )))
fatal_error( "out of memory\n" );
p = strcpy( path, oldcwd ) + strlen( oldcwd );
strcpy( p, "/wineserver" );
execl( path, "wineserver", NULL );
strcpy( p, "/server/wineserver" );
execl( path, "wineserver", NULL );
free(path);
fatal_error( "could not exec wineserver\n" );
}
started = 1;
waitpid( pid, &status, 0 );
status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
if (status) exit(status); /* server failed */
}
}
/***********************************************************************
* server_connect
*
* Attempt to connect to an existing server socket.
* We need to be in the server directory already.
*/
static int server_connect( const char *oldcwd, const char *serverdir )
{
struct sockaddr_un addr;
struct stat st;
int s, slen, retry;
/* chdir to the server directory */
if (chdir( serverdir ) == -1)
{
if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
start_server( "." );
if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
}
/* make sure we are at the right place */
if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
for (retry = 0; retry < 3; retry++)
{
/* if not the first try, wait a bit to leave the server time to exit */
if (retry) usleep( 100000 * retry * retry );
/* check for an existing socket */
if (lstat( SOCKETNAME, &st ) == -1)
{
if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
}
/* make sure the socket is sane (ISFIFO needed for Solaris) */
if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
if (st.st_uid != getuid())
fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
/* try to connect to it */
addr.sun_family = AF_UNIX;
strcpy( addr.sun_path, SOCKETNAME );
slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
#ifdef HAVE_SOCKADDR_SUN_LEN
addr.sun_len = slen;
#endif
if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
{
fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
return s;
}
close( s );
}
fatal_error( "file '%s/%s' exists,\n"
" but I cannot connect to it; maybe the server has crashed?\n"
" If this is the case, you should remove this socket file and try again.\n",
serverdir, SOCKETNAME );
}
/***********************************************************************
* CLIENT_InitServer
*
* Start the server and create the initial socket pair.
*/
int CLIENT_InitServer(void)
{
int fd, size;
char hostname[64];
char *oldcwd, *serverdir;
const char *configdir;
/* retrieve the current directory */
for (size = 512; ; size *= 2)
{
if (!(oldcwd = malloc( size ))) break;
if (getcwd( oldcwd, size )) break;
free( oldcwd );
if (errno == ERANGE) continue;
oldcwd = NULL;
break;
}
/* if argv[0] is a relative path, make it absolute */
full_argv0 = argv0;
if (oldcwd && argv0[0] != '/' && strchr( argv0, '/' ))
{
char *new_argv0 = malloc( strlen(oldcwd) + strlen(argv0) + 2 );
if (new_argv0)
{
strcpy( new_argv0, oldcwd );
strcat( new_argv0, "/" );
strcat( new_argv0, argv0 );
full_argv0 = new_argv0;
}
}
/* get the server directory name */
if (gethostname( hostname, sizeof(hostname) ) == -1) fatal_perror( "gethostname" );
configdir = get_config_dir();
serverdir = malloc( strlen(configdir) + strlen(SERVERDIR) + strlen(hostname) + 1 );
if (!serverdir) fatal_error( "out of memory\n" );
strcpy( serverdir, configdir );
strcat( serverdir, SERVERDIR );
strcat( serverdir, hostname );
/* connect to the server */
fd = server_connect( oldcwd, serverdir );
/* switch back to the starting directory */
if (oldcwd)
{
chdir( oldcwd );
free( oldcwd );
}
return fd;
}
/***********************************************************************
* CLIENT_InitThread
*
* Send an init thread request. Return 0 if OK.
*/
int CLIENT_InitThread(void)
{
struct get_thread_buffer_request *req;
TEB *teb = NtCurrentTeb();
int fd, ret, size;
/* ignore SIGPIPE so that we get a EPIPE error instead */
signal( SIGPIPE, SIG_IGN );
teb->request_fd = wine_server_recv_fd( -1, 0 );
if (teb->request_fd == -1) server_protocol_error( "no request fd passed on first request\n" );
fcntl( teb->request_fd, F_SETFD, 1 ); /* set close on exec flag */
teb->reply_fd = wine_server_recv_fd( -1, 0 );
if (teb->reply_fd == -1) server_protocol_error( "no reply fd passed on first request\n" );
fcntl( teb->reply_fd, F_SETFD, 1 ); /* set close on exec flag */
fd = wine_server_recv_fd( -1, 0 );
if (fd == -1) server_protocol_error( "no fd received for thread buffer\n" );
if ((size = lseek( fd, 0, SEEK_END )) == -1) server_perror( "lseek" );
teb->buffer = mmap( 0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
close( fd );
if (teb->buffer == (void*)-1) server_perror( "mmap" );
teb->buffer_info = (struct server_buffer_info *)((char *)teb->buffer + size) - 1;
wait_reply();
req = (struct get_thread_buffer_request *)teb->buffer;
teb->pid = req->pid;
teb->tid = req->tid;
if (req->version != SERVER_PROTOCOL_VERSION)
server_protocol_error( "version mismatch %d/%d.\n"
"Your %s binary was not upgraded correctly,\n"
"or you have an older one somewhere in your PATH.\n",
req->version, SERVER_PROTOCOL_VERSION,
(req->version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
if (req->boot) boot_thread_id = teb->tid;
else if (boot_thread_id == teb->tid) boot_thread_id = 0;
SERVER_START_REQ
{
struct init_thread_request *req = wine_server_alloc_req( sizeof(*req), 0 );
req->unix_pid = getpid();
req->teb = teb;
req->entry = teb->entry_point;
ret = wine_server_call( REQ_INIT_THREAD );
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* CLIENT_BootDone
*
* Signal that we have finished booting, and set debug level.
*/
int CLIENT_BootDone( int debug_level )
{
int ret;
SERVER_START_REQ
{
struct boot_done_request *req = wine_server_alloc_req( sizeof(*req), 0 );
req->debug_level = debug_level;
ret = server_call( REQ_BOOT_DONE );
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* CLIENT_IsBootThread
*
* Return TRUE if current thread is the boot thread.
*/
int CLIENT_IsBootThread(void)
{
return (GetCurrentThreadId() == (DWORD)boot_thread_id);
}
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