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wine/dlls/setupapi/fakedll.c

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/*
* Creation of Wine fake dlls for apps that access the dll file directly.
*
* Copyright 2006 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <fcntl.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#define NONAMELESSSTRUCT
#define NONAMELESSUNION
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winnt.h"
#include "winternl.h"
#include "wine/unicode.h"
#include "wine/library.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(setupapi);
static const char fakedll_signature[] = "Wine placeholder DLL";
static const unsigned int file_alignment = 512;
static const unsigned int section_alignment = 4096;
static const unsigned int max_dll_name_len = 64;
static void *file_buffer;
static size_t file_buffer_size;
static unsigned int handled_count;
static unsigned int handled_total;
static char **handled_dlls;
struct dll_info
{
HANDLE handle;
IMAGE_NT_HEADERS *nt;
DWORD file_pos;
DWORD mem_pos;
};
#define ALIGN(size,align) (((size) + (align) - 1) & ~((align) - 1))
/* contents of the dll sections */
static const BYTE dll_code_section[] = { 0x31, 0xc0, /* xor %eax,%eax */
0xc2, 0x0c, 0x00 }; /* ret $12 */
static const BYTE exe_code_section[] = { 0xb8, 0x01, 0x00, 0x00, 0x00, /* movl $1,%eax */
0xc2, 0x04, 0x00 }; /* ret $4 */
static const IMAGE_BASE_RELOCATION reloc_section; /* empty relocs */
/* wrapper for WriteFile */
static inline BOOL xwrite( struct dll_info *info, const void *data, DWORD size, DWORD offset )
{
DWORD res;
return (SetFilePointer( info->handle, offset, NULL, FILE_BEGIN ) != INVALID_SET_FILE_POINTER &&
WriteFile( info->handle, data, size, &res, NULL ) &&
res == size);
}
/* add a new section to the dll NT header */
static void add_section( struct dll_info *info, const char *name, DWORD size, DWORD flags )
{
IMAGE_SECTION_HEADER *sec = (IMAGE_SECTION_HEADER *)(info->nt + 1);
sec += info->nt->FileHeader.NumberOfSections;
memcpy( sec->Name, name, min( strlen(name), sizeof(sec->Name)) );
sec->Misc.VirtualSize = ALIGN( size, section_alignment );
sec->VirtualAddress = info->mem_pos;
sec->SizeOfRawData = size;
sec->PointerToRawData = info->file_pos;
sec->Characteristics = flags;
info->file_pos += ALIGN( size, file_alignment );
info->mem_pos += ALIGN( size, section_alignment );
info->nt->FileHeader.NumberOfSections++;
}
/* add a data directory to the dll NT header */
static inline void add_directory( struct dll_info *info, unsigned int idx, DWORD rva, DWORD size )
{
info->nt->OptionalHeader.DataDirectory[idx].VirtualAddress = rva;
info->nt->OptionalHeader.DataDirectory[idx].Size = size;
}
/* convert a dll name W->A without depending on the current codepage */
static char *dll_name_WtoA( char *nameA, const WCHAR *nameW, unsigned int len )
{
unsigned int i;
for (i = 0; i < len; i++)
{
char c = nameW[i];
if (nameW[i] > 127) return NULL;
if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
nameA[i] = c;
}
nameA[i] = 0;
return nameA;
}
/* convert a dll name A->W without depending on the current codepage */
static WCHAR *dll_name_AtoW( WCHAR *nameW, const char *nameA, unsigned int len )
{
unsigned int i;
for (i = 0; i < len; i++) nameW[i] = nameA[i];
nameW[i] = 0;
return nameW;
}
/* add a dll to the list of dll that have been taken care of */
static BOOL add_handled_dll( const WCHAR *name )
{
unsigned int len = strlenW( name );
int i, min, max, pos, res;
char *nameA;
if (!(nameA = HeapAlloc( GetProcessHeap(), 0, len + 1 ))) return FALSE;
if (!dll_name_WtoA( nameA, name, len )) goto failed;
min = 0;
max = handled_count - 1;
while (min <= max)
{
pos = (min + max) / 2;
res = strcmp( handled_dlls[pos], nameA );
if (!res) goto failed; /* already in the list */
if (res < 0) min = pos + 1;
else max = pos - 1;
}
if (handled_count >= handled_total)
{
char **new_dlls;
unsigned int new_count = max( 64, handled_total * 2 );
if (handled_dlls) new_dlls = HeapReAlloc( GetProcessHeap(), 0, handled_dlls,
new_count * sizeof(*handled_dlls) );
else new_dlls = HeapAlloc( GetProcessHeap(), 0, new_count * sizeof(*handled_dlls) );
if (!new_dlls) goto failed;
handled_dlls = new_dlls;
handled_total = new_count;
}
for (i = handled_count; i > min; i--) handled_dlls[i] = handled_dlls[i - 1];
handled_dlls[i] = nameA;
handled_count++;
return TRUE;
failed:
HeapFree( GetProcessHeap(), 0, nameA );
return FALSE;
}
/* read in the contents of a file into the global file buffer */
/* return 1 on success, 0 on nonexistent file, -1 on other error */
static int read_file( const char *name, void **data, size_t *size )
{
static char static_file_buffer[4096];
struct stat st;
void *buffer = static_file_buffer;
int fd, ret = -1;
size_t header_size;
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
const size_t min_size = sizeof(*dos) + sizeof(fakedll_signature) +
FIELD_OFFSET( IMAGE_NT_HEADERS, OptionalHeader.MajorLinkerVersion );
if ((fd = open( name, O_RDONLY | O_BINARY )) == -1) return 0;
if (fstat( fd, &st ) == -1) goto done;
*size = st.st_size;
if (st.st_size > sizeof(static_file_buffer))
{
if (!file_buffer || st.st_size > file_buffer_size)
{
HeapFree( GetProcessHeap(), 0, file_buffer );
if (!(file_buffer = HeapAlloc( GetProcessHeap(), 0, st.st_size ))) goto done;
file_buffer_size = st.st_size;
}
buffer = file_buffer;
}
/* check for valid fake dll file */
if (st.st_size < min_size) goto done;
header_size = min( st.st_size, 4096 );
if (pread( fd, buffer, header_size, 0 ) != header_size) goto done;
dos = buffer;
if (dos->e_magic != IMAGE_DOS_SIGNATURE) goto done;
if (dos->e_lfanew < sizeof(fakedll_signature)) goto done;
if (memcmp( dos + 1, fakedll_signature, sizeof(fakedll_signature) )) goto done;
if (dos->e_lfanew + FIELD_OFFSET(IMAGE_NT_HEADERS,OptionalHeader.MajorLinkerVersion) > header_size)
goto done;
nt = (IMAGE_NT_HEADERS *)((char *)buffer + dos->e_lfanew);
if (nt->Signature == IMAGE_NT_SIGNATURE && nt->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
{
/* wrong 32/64 type, pretend it doesn't exist */
ret = 0;
goto done;
}
if (st.st_size == header_size ||
pread( fd, (char *)buffer + header_size,
st.st_size - header_size, header_size ) == st.st_size - header_size)
{
*data = buffer;
ret = 1;
}
done:
close( fd );
return ret;
}
/* build a complete fake dll from scratch */
static BOOL build_fake_dll( HANDLE file )
{
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
struct dll_info info;
BYTE *buffer;
BOOL ret = FALSE;
DWORD lfanew = (sizeof(*dos) + sizeof(fakedll_signature) + 15) & ~15;
DWORD size, header_size = lfanew + sizeof(*nt);
info.handle = file;
buffer = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, header_size + 8 * sizeof(IMAGE_SECTION_HEADER) );
dos = (IMAGE_DOS_HEADER *)buffer;
dos->e_magic = IMAGE_DOS_SIGNATURE;
dos->e_cblp = sizeof(*dos);
dos->e_cp = 1;
dos->e_cparhdr = lfanew / 16;
dos->e_minalloc = 0;
dos->e_maxalloc = 0xffff;
dos->e_ss = 0x0000;
dos->e_sp = 0x00b8;
dos->e_lfarlc = lfanew;
dos->e_lfanew = lfanew;
memcpy( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
nt = info.nt = (IMAGE_NT_HEADERS *)(buffer + lfanew);
/* some fields are copied from the source dll */
nt->FileHeader.Machine = IMAGE_FILE_MACHINE_I386;
nt->FileHeader.TimeDateStamp = 0;
nt->FileHeader.Characteristics = IMAGE_FILE_DLL;
nt->OptionalHeader.MajorLinkerVersion = 1;
nt->OptionalHeader.MinorLinkerVersion = 0;
nt->OptionalHeader.MajorOperatingSystemVersion = 1;
nt->OptionalHeader.MinorOperatingSystemVersion = 0;
nt->OptionalHeader.MajorImageVersion = 1;
nt->OptionalHeader.MinorImageVersion = 0;
nt->OptionalHeader.MajorSubsystemVersion = 4;
nt->OptionalHeader.MinorSubsystemVersion = 0;
nt->OptionalHeader.Win32VersionValue = 0;
nt->OptionalHeader.Subsystem = IMAGE_SUBSYSTEM_WINDOWS_GUI;
nt->OptionalHeader.DllCharacteristics = 0;
nt->OptionalHeader.SizeOfStackReserve = 0;
nt->OptionalHeader.SizeOfStackCommit = 0;
nt->OptionalHeader.SizeOfHeapReserve = 0;
nt->OptionalHeader.SizeOfHeapCommit = 0;
/* other fields have fixed values */
nt->Signature = IMAGE_NT_SIGNATURE;
nt->FileHeader.NumberOfSections = 0;
nt->FileHeader.SizeOfOptionalHeader = IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
nt->OptionalHeader.Magic = IMAGE_NT_OPTIONAL_HDR_MAGIC;
nt->OptionalHeader.ImageBase = 0x10000000;
nt->OptionalHeader.SectionAlignment = section_alignment;
nt->OptionalHeader.FileAlignment = file_alignment;
nt->OptionalHeader.NumberOfRvaAndSizes = IMAGE_NUMBEROF_DIRECTORY_ENTRIES;
header_size = (BYTE *)(nt + 1) - buffer;
info.mem_pos = ALIGN( header_size, section_alignment );
info.file_pos = ALIGN( header_size, file_alignment );
nt->OptionalHeader.AddressOfEntryPoint = info.mem_pos;
nt->OptionalHeader.BaseOfCode = info.mem_pos;
if (nt->FileHeader.Characteristics & IMAGE_FILE_DLL)
{
size = sizeof(dll_code_section);
if (!xwrite( &info, dll_code_section, size, info.file_pos )) goto done;
}
else
{
size = sizeof(exe_code_section);
if (!xwrite( &info, exe_code_section, size, info.file_pos )) goto done;
}
nt->OptionalHeader.SizeOfCode = size;
add_section( &info, ".text", size, IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ );
if (!xwrite( &info, &reloc_section, sizeof(reloc_section), info.file_pos )) goto done;
add_directory( &info, IMAGE_DIRECTORY_ENTRY_BASERELOC, info.mem_pos, sizeof(reloc_section) );
add_section( &info, ".reloc", sizeof(reloc_section),
IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_READ );
header_size += nt->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER);
nt->OptionalHeader.SizeOfHeaders = ALIGN( header_size, file_alignment );
nt->OptionalHeader.SizeOfImage = ALIGN( info.mem_pos, section_alignment );
ret = xwrite( &info, buffer, header_size, 0 );
done:
HeapFree( GetProcessHeap(), 0, buffer );
return ret;
}
/* check if an existing file is a fake dll so that we can overwrite it */
static BOOL is_fake_dll( HANDLE h )
{
IMAGE_DOS_HEADER *dos;
DWORD size;
BYTE buffer[sizeof(*dos) + sizeof(fakedll_signature)];
if (!ReadFile( h, buffer, sizeof(buffer), &size, NULL ) || size != sizeof(buffer))
return FALSE;
dos = (IMAGE_DOS_HEADER *)buffer;
if (dos->e_magic != IMAGE_DOS_SIGNATURE) return FALSE;
if (dos->e_lfanew < size) return FALSE;
return !memcmp( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
}
/* create directories leading to a given file */
static void create_directories( const WCHAR *name )
{
WCHAR *path, *p;
/* create the directory/directories */
path = HeapAlloc(GetProcessHeap(), 0, (strlenW(name) + 1)*sizeof(WCHAR));
strcpyW(path, name);
p = strchrW(path, '\\');
while (p != NULL)
{
*p = 0;
if (!CreateDirectoryW(path, NULL))
TRACE("Couldn't create directory %s - error: %d\n", wine_dbgstr_w(path), GetLastError());
*p = '\\';
p = strchrW(p+1, '\\');
}
HeapFree(GetProcessHeap(), 0, path);
}
static inline char *prepend( char *buffer, const char *str, size_t len )
{
return memcpy( buffer - len, str, len );
}
/* try to load a pre-compiled fake dll */
static void *load_fake_dll( const WCHAR *name, size_t *size )
{
const char *build_dir = wine_get_build_dir();
const char *path;
char *file, *ptr;
void *data = NULL;
unsigned int i, pos, len, namelen, maxlen = 0;
WCHAR *p;
int res = 0;
if ((p = strrchrW( name, '\\' ))) name = p + 1;
i = 0;
if (build_dir) maxlen = strlen(build_dir) + sizeof("/programs/") + strlenW(name);
while ((path = wine_dll_enum_load_path( i++ ))) maxlen = max( maxlen, strlen(path) );
maxlen += sizeof("/fakedlls") + strlenW(name) + 2;
if (!(file = HeapAlloc( GetProcessHeap(), 0, maxlen ))) return NULL;
len = strlenW( name );
pos = maxlen - len - sizeof(".fake");
if (!dll_name_WtoA( file + pos, name, len )) goto done;
file[--pos] = '/';
if (build_dir)
{
strcpy( file + pos + len + 1, ".fake" );
/* try as a dll */
ptr = file + pos;
namelen = len + 1;
if (namelen > 4 && !memcmp( ptr + namelen - 4, ".dll", 4 )) namelen -= 4;
ptr = prepend( ptr, ptr, namelen );
ptr = prepend( ptr, "/dlls", sizeof("/dlls") - 1 );
ptr = prepend( ptr, build_dir, strlen(build_dir) );
if ((res = read_file( ptr, &data, size ))) goto done;
/* now as a program */
ptr = file + pos;
namelen = len + 1;
if (namelen > 4 && !memcmp( ptr + namelen - 4, ".exe", 4 )) namelen -= 4;
ptr = prepend( ptr, ptr, namelen );
ptr = prepend( ptr, "/programs", sizeof("/programs") - 1 );
ptr = prepend( ptr, build_dir, strlen(build_dir) );
if ((res = read_file( ptr, &data, size ))) goto done;
}
file[pos + len + 1] = 0;
for (i = 0; (path = wine_dll_enum_load_path( i )); i++)
{
ptr = prepend( file + pos, "/fakedlls", sizeof("/fakedlls") - 1 );
ptr = prepend( ptr, path, strlen(path) );
if ((res = read_file( ptr, &data, size ))) break;
}
done:
HeapFree( GetProcessHeap(), 0, file );
if (res == 1) return data;
return NULL;
}
/* create the fake dll destination file */
static HANDLE create_dest_file( const WCHAR *name )
{
/* first check for an existing file */
HANDLE h = CreateFileW( name, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL );
if (h != INVALID_HANDLE_VALUE)
{
if (!is_fake_dll( h ))
{
TRACE( "%s is not a fake dll, not overwriting it\n", debugstr_w(name) );
CloseHandle( h );
return 0;
}
/* truncate the file */
SetFilePointer( h, 0, NULL, FILE_BEGIN );
SetEndOfFile( h );
}
else
{
if (GetLastError() == ERROR_PATH_NOT_FOUND) create_directories( name );
h = CreateFileW( name, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL );
if (h == INVALID_HANDLE_VALUE)
ERR( "failed to create %s (error=%u)\n", debugstr_w(name), GetLastError() );
}
return h;
}
/* copy a fake dll file to the dest directory */
static void install_fake_dll( WCHAR *dest, char *file, const char *ext )
{
int ret;
size_t size;
void *data;
DWORD written;
WCHAR *destname = dest + strlenW(dest);
char *name = strrchr( file, '/' ) + 1;
char *end = name + strlen(name);
if (ext) strcpy( end, ext );
if (!(ret = read_file( file, &data, &size ))) return;
if (end > name + 2 && !strncmp( end - 2, "16", 2 )) end -= 2; /* remove "16" suffix */
dll_name_AtoW( destname, name, end - name );
if (!add_handled_dll( destname )) ret = -1;
if (ret != -1)
{
HANDLE h = create_dest_file( dest );
if (h && h != INVALID_HANDLE_VALUE)
{
TRACE( "%s -> %s\n", debugstr_a(file), debugstr_w(dest) );
ret = (WriteFile( h, data, size, &written, NULL ) && written == size);
if (!ret) ERR( "failed to write to %s (error=%u)\n", debugstr_w(dest), GetLastError() );
CloseHandle( h );
if (!ret) DeleteFileW( dest );
}
}
*destname = 0; /* restore it for next file */
}
/* find and install all fake dlls in a given lib directory */
static void install_lib_dir( WCHAR *dest, char *file, const char *default_ext )
{
DIR *dir;
struct dirent *de;
char *name;
if (!(dir = opendir( file ))) return;
name = file + strlen(file);
*name++ = '/';
while ((de = readdir( dir )))
{
if (strlen( de->d_name ) > max_dll_name_len) continue;
if (!strcmp( de->d_name, "." )) continue;
if (!strcmp( de->d_name, ".." )) continue;
strcpy( name, de->d_name );
if (default_ext) /* inside build dir */
{
strcat( name, "/" );
strcat( name, de->d_name );
if (!strchr( de->d_name, '.' )) strcat( name, default_ext );
install_fake_dll( dest, file, ".fake" );
}
else install_fake_dll( dest, file, NULL );
}
closedir( dir );
}
/* create fake dlls in dirname for all the files we can find */
static BOOL create_wildcard_dlls( const WCHAR *dirname )
{
const char *build_dir = wine_get_build_dir();
const char *path;
unsigned int i, maxlen = 0;
char *file;
WCHAR *dest;
if (build_dir) maxlen = strlen(build_dir) + sizeof("/programs/");
for (i = 0; (path = wine_dll_enum_load_path(i)); i++) maxlen = max( maxlen, strlen(path) );
maxlen += 2 * max_dll_name_len + 2 + sizeof(".dll.fake");
if (!(file = HeapAlloc( GetProcessHeap(), 0, maxlen ))) return FALSE;
if (!(dest = HeapAlloc( GetProcessHeap(), 0, (strlenW(dirname) + max_dll_name_len) * sizeof(WCHAR) )))
{
HeapFree( GetProcessHeap(), 0, file );
return FALSE;
}
strcpyW( dest, dirname );
dest[strlenW(dest) - 1] = 0; /* remove wildcard */
if (build_dir)
{
strcpy( file, build_dir );
strcat( file, "/dlls" );
install_lib_dir( dest, file, ".dll" );
strcpy( file, build_dir );
strcat( file, "/programs" );
install_lib_dir( dest, file, ".exe" );
}
for (i = 0; (path = wine_dll_enum_load_path( i )); i++)
{
strcpy( file, path );
strcat( file, "/fakedlls" );
install_lib_dir( dest, file, NULL );
}
HeapFree( GetProcessHeap(), 0, file );
HeapFree( GetProcessHeap(), 0, dest );
return TRUE;
}
/***********************************************************************
* create_fake_dll
*/
BOOL create_fake_dll( const WCHAR *name, const WCHAR *source )
{
HANDLE h;
BOOL ret;
size_t size;
const WCHAR *filename;
void *buffer;
if (!(filename = strrchrW( name, '\\' ))) filename = name;
else filename++;
/* check for empty name which means to only create the directory */
if (!filename[0])
{
create_directories( name );
return TRUE;
}
if (filename[0] == '*' && !filename[1]) return create_wildcard_dlls( name );
add_handled_dll( filename );
if (!(h = create_dest_file( name ))) return TRUE; /* not a fake dll */
if (h == INVALID_HANDLE_VALUE) return FALSE;
if (source[0] == '-' && !source[1])
{
/* '-' source means delete the file */
TRACE( "deleting %s\n", debugstr_w(name) );
ret = FALSE;
}
else if ((buffer = load_fake_dll( source, &size )))
{
DWORD written;
ret = (WriteFile( h, buffer, size, &written, NULL ) && written == size);
if (!ret) ERR( "failed to write to %s (error=%u)\n", debugstr_w(name), GetLastError() );
}
else
{
WARN( "fake dll %s not found for %s\n", debugstr_w(source), debugstr_w(name) );
ret = build_fake_dll( h );
}
CloseHandle( h );
if (!ret) DeleteFileW( name );
return ret;
}
/***********************************************************************
* cleanup_fake_dlls
*/
void cleanup_fake_dlls(void)
{
HeapFree( GetProcessHeap(), 0, file_buffer );
file_buffer = NULL;
HeapFree( GetProcessHeap(), 0, handled_dlls );
handled_count = handled_total = 0;
}
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