dlls/setupapi/fakedll.c

   1 /*
   2  * Creation of Wine fake dlls for apps that access the dll file directly.
   3  *
   4  * Copyright 2006 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22
  23 #define NONAMELESSSTRUCT
  24 #define NONAMELESSUNION
  25 #include "ntstatus.h"
  26 #define WIN32_NO_STATUS
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winuser.h"
  30 #include "winnt.h"
  31 #include "winternl.h"
  32 #include "wine/unicode.h"
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(setupapi);
  36
  37 static const char fakedll_signature[] = "Wine placeholder DLL";
  38
  39 static const unsigned int file_alignment = 512;
  40 static const unsigned int section_alignment = 4096;
  41
  42 struct dll_info
  43 {
  44     HANDLE            handle;
  45     IMAGE_NT_HEADERS *nt;
  46     DWORD             file_pos;
  47     DWORD             mem_pos;
  48 };
  49
  50 #define ALIGN(size,align) (((size) + (align) - 1) & ~((align) - 1))
  51
  52 /* contents of the dll sections */
  53
  54 static const BYTE dll_code_section[] = { 0x31, 0xc0,          /* xor %eax,%eax */
  55                                          0xc2, 0x0c, 0x00 };  /* ret $12 */
  56
  57 static const BYTE exe_code_section[] = { 0xb8, 0x01, 0x00, 0x00, 0x00,  /* movl $1,%eax */
  58                                          0xc2, 0x04, 0x00 };            /* ret $4 */
  59
  60 static const IMAGE_BASE_RELOCATION reloc_section;  /* empty relocs */
  61
  62
  63 /* wrapper for WriteFile */
  64 static inline BOOL xwrite( struct dll_info *info, const void *data, DWORD size, DWORD offset )
  65 {
  66     DWORD res;
  67
  68     return (SetFilePointer( info->handle, offset, NULL, FILE_BEGIN ) != INVALID_SET_FILE_POINTER &&
  69             WriteFile( info->handle, data, size, &res, NULL ) &&
  70             res == size);
  71 }
  72
  73 /* add a new section to the dll NT header */
  74 static void add_section( struct dll_info *info, const char *name, DWORD size, DWORD flags )
  75 {
  76     IMAGE_SECTION_HEADER *sec = (IMAGE_SECTION_HEADER *)(info->nt + 1);
  77
  78     sec += info->nt->FileHeader.NumberOfSections;
  79     memcpy( (char *)sec->Name, name, min( strlen(name), sizeof(sec->Name)) );
  80     sec->Misc.VirtualSize = ALIGN( size, section_alignment );
  81     sec->VirtualAddress   = info->mem_pos;
  82     sec->SizeOfRawData    = size;
  83     sec->PointerToRawData = info->file_pos;
  84     sec->Characteristics  = flags;
  85     info->file_pos += ALIGN( size, file_alignment );
  86     info->mem_pos  += ALIGN( size, section_alignment );
  87     info->nt->FileHeader.NumberOfSections++;
  88 }
  89
  90 /* add a data directory to the dll NT header */
  91 static inline void add_directory( struct dll_info *info, unsigned int idx, DWORD rva, DWORD size )
  92 {
  93     info->nt->OptionalHeader.DataDirectory[idx].VirtualAddress = rva;
  94     info->nt->OptionalHeader.DataDirectory[idx].Size = size;
  95 }
  96
  97 /* find the limits of the resource data */
  98 static void get_resource_data( const IMAGE_RESOURCE_DIRECTORY *dir, const BYTE *root,
  99                                DWORD *rva_start, DWORD *rva_end )
 100 {
 101     const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 102     int i;
 103
 104     entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 105     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 106     {
 107         const void *ptr = root + entry->u2.s3.OffsetToDirectory;
 108         if (entry->u2.s3.DataIsDirectory) get_resource_data( ptr, root, rva_start, rva_end );
 109         else
 110         {
 111             const IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 112             *rva_start = min( *rva_start, data->OffsetToData );
 113             *rva_end = max( *rva_end, data->OffsetToData + data->Size );
 114         }
 115     }
 116 }
 117
 118 /* fixup RVAs of resource data */
 119 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 120 {
 121     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 122     int i;
 123
 124     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 125     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 126     {
 127         void *ptr = root + entry->u2.s3.OffsetToDirectory;
 128         if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
 129         else
 130         {
 131             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 132             if (data->OffsetToData) data->OffsetToData += delta;
 133         }
 134     }
 135 }
 136
 137 /* add version resources to the dll by copying them from the source module */
 138 static BOOL add_version_resource( HMODULE module, struct dll_info *dll_info )
 139 {
 140     BOOL ret = FALSE;
 141     DWORD rva_start = ~0U, rva_end = 0, dir_size, total_size;
 142     const IMAGE_RESOURCE_DIRECTORY *basedir;
 143     const BYTE *data_start, *root;
 144     BYTE *buffer;
 145
 146     if (!module) return TRUE;
 147     if (LdrFindResourceDirectory_U( module, NULL, 0, &basedir ) != STATUS_SUCCESS) return TRUE;
 148     root = (const BYTE *)basedir;
 149     get_resource_data( basedir, root, &rva_start, &rva_end );
 150     data_start = (const BYTE *)module + rva_start;
 151     if (data_start <= root) return FALSE;
 152     dir_size = data_start - root;
 153     if (!(buffer = HeapAlloc( GetProcessHeap(), 0, dir_size ))) return FALSE;
 154     memcpy( buffer, root, dir_size );
 155     fixup_resources( (IMAGE_RESOURCE_DIRECTORY *)buffer, buffer, dll_info->mem_pos + dir_size - rva_start );
 156     if (!xwrite( dll_info, buffer, dir_size, dll_info->file_pos )) goto done;
 157     if (!xwrite( dll_info, data_start, rva_end - rva_start, dll_info->file_pos + dir_size )) goto done;
 158     total_size = dir_size + rva_end - rva_start;
 159     add_directory( dll_info, IMAGE_DIRECTORY_ENTRY_RESOURCE, dll_info->mem_pos, total_size );
 160     add_section( dll_info, ".rsrc", total_size, IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ );
 161     ret = TRUE;
 162 done:
 163     HeapFree( GetProcessHeap(), 0, buffer );
 164     return ret;
 165 }
 166
 167 /* build a complete fake dll, optionally using module as a source */
 168 static BOOL build_fake_dll( HANDLE file, HMODULE module )
 169 {
 170     IMAGE_DOS_HEADER *dos;
 171     IMAGE_NT_HEADERS *nt;
 172     const IMAGE_NT_HEADERS *src_nt = NULL;
 173     struct dll_info info;
 174     BYTE *buffer;
 175     BOOL ret = FALSE;
 176     DWORD lfanew = (sizeof(*dos) + sizeof(fakedll_signature) + 15) & ~15;
 177     DWORD size, header_size = lfanew + sizeof(*nt);
 178
 179     info.handle = file;
 180     buffer = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, header_size + 8 * sizeof(IMAGE_SECTION_HEADER) );
 181
 182     dos = (IMAGE_DOS_HEADER *)buffer;
 183     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 184     dos->e_cblp     = sizeof(*dos);
 185     dos->e_cp       = 1;
 186     dos->e_cparhdr  = lfanew / 16;
 187     dos->e_minalloc = 0;
 188     dos->e_maxalloc = 0xffff;
 189     dos->e_ss       = 0x0000;
 190     dos->e_sp       = 0x00b8;
 191     dos->e_lfarlc   = lfanew;
 192     dos->e_lfanew   = lfanew;
 193     memcpy( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
 194
 195     nt = info.nt = (IMAGE_NT_HEADERS *)(buffer + lfanew);
 196     src_nt = RtlImageNtHeader( module );
 197     /* some fields are copied from the source dll */
 198 #define SET(field,def) nt->field = src_nt ? src_nt->field : def
 199     SET( FileHeader.Machine, IMAGE_FILE_MACHINE_I386 );
 200     SET( FileHeader.TimeDateStamp, 0 );
 201     SET( FileHeader.Characteristics, IMAGE_FILE_DLL );
 202     SET( OptionalHeader.MajorLinkerVersion, 1 );
 203     SET( OptionalHeader.MinorLinkerVersion, 0 );
 204     SET( OptionalHeader.MajorOperatingSystemVersion, 1 );
 205     SET( OptionalHeader.MinorOperatingSystemVersion, 0 );
 206     SET( OptionalHeader.MajorImageVersion, 1 );
 207     SET( OptionalHeader.MinorImageVersion, 0 );
 208     SET( OptionalHeader.MajorSubsystemVersion, 4 );
 209     SET( OptionalHeader.MinorSubsystemVersion, 0 );
 210     SET( OptionalHeader.Win32VersionValue, 0 );
 211     SET( OptionalHeader.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI );
 212     SET( OptionalHeader.DllCharacteristics, 0 );
 213     SET( OptionalHeader.SizeOfStackReserve, 0 );
 214     SET( OptionalHeader.SizeOfStackCommit, 0 );
 215     SET( OptionalHeader.SizeOfHeapReserve, 0 );
 216     SET( OptionalHeader.SizeOfHeapCommit, 0 );
 217 #undef SET
 218     /* other fields have fixed values */
 219     nt->Signature                              = IMAGE_NT_SIGNATURE;
 220     nt->FileHeader.NumberOfSections            = 0;
 221     nt->FileHeader.SizeOfOptionalHeader        = IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
 222     nt->OptionalHeader.Magic                   = IMAGE_NT_OPTIONAL_HDR_MAGIC;
 223     nt->OptionalHeader.ImageBase               = 0x10000000;
 224     nt->OptionalHeader.SectionAlignment        = section_alignment;
 225     nt->OptionalHeader.FileAlignment           = file_alignment;
 226     nt->OptionalHeader.NumberOfRvaAndSizes     = IMAGE_NUMBEROF_DIRECTORY_ENTRIES;
 227
 228     header_size = (BYTE *)(nt + 1) - buffer;
 229     info.mem_pos  = ALIGN( header_size, section_alignment );
 230     info.file_pos = ALIGN( header_size, file_alignment );
 231
 232     nt->OptionalHeader.AddressOfEntryPoint = info.mem_pos;
 233     nt->OptionalHeader.BaseOfCode          = info.mem_pos;
 234
 235     if (nt->FileHeader.Characteristics & IMAGE_FILE_DLL)
 236     {
 237         size = sizeof(dll_code_section);
 238         if (!xwrite( &info, dll_code_section, size, info.file_pos )) goto done;
 239     }
 240     else
 241     {
 242         size = sizeof(exe_code_section);
 243         if (!xwrite( &info, exe_code_section, size, info.file_pos )) goto done;
 244     }
 245     nt->OptionalHeader.SizeOfCode = size;
 246     add_section( &info, ".text", size, IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ );
 247
 248     if (!xwrite( &info, &reloc_section, sizeof(reloc_section), info.file_pos )) goto done;
 249     add_directory( &info, IMAGE_DIRECTORY_ENTRY_BASERELOC, info.mem_pos, sizeof(reloc_section) );
 250     add_section( &info, ".reloc", sizeof(reloc_section),
 251                  IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_READ );
 252
 253     if (!add_version_resource( module, &info )) goto done;
 254
 255     header_size += nt->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER);
 256     nt->OptionalHeader.SizeOfHeaders = ALIGN( header_size, file_alignment );
 257     nt->OptionalHeader.SizeOfImage   = ALIGN( info.mem_pos, section_alignment );
 258     ret = xwrite( &info, buffer, header_size, 0 );
 259 done:
 260     HeapFree( GetProcessHeap(), 0, buffer );
 261     return ret;
 262 }
 263
 264 /* check if an existing file is a fake dll so that we can overwrite it */
 265 static BOOL is_fake_dll( HANDLE h )
 266 {
 267     IMAGE_DOS_HEADER *dos;
 268     DWORD size;
 269     BYTE buffer[sizeof(*dos) + sizeof(fakedll_signature)];
 270
 271     if (!ReadFile( h, buffer, sizeof(buffer), &size, NULL ) || size != sizeof(buffer))
 272         return FALSE;
 273     dos = (IMAGE_DOS_HEADER *)buffer;
 274     if (dos->e_magic != IMAGE_DOS_SIGNATURE) return FALSE;
 275     if (dos->e_lfanew < size) return FALSE;
 276     return !memcmp( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
 277 }
 278
 279 /* create directories leading to a given file */
 280 static void create_directories( const WCHAR *name )
 281 {
 282     WCHAR *path, *p;
 283
 284     /* create the directory/directories */
 285     path = HeapAlloc(GetProcessHeap(), 0, (strlenW(name) + 1)*sizeof(WCHAR));
 286     strcpyW(path, name);
 287
 288     p = strchrW(path, '\\');
 289     while (p != NULL)
 290     {
 291         *p = 0;
 292         if (!CreateDirectoryW(path, NULL))
 293             TRACE("Couldn't create directory %s - error: %d\n", wine_dbgstr_w(path), GetLastError());
 294         *p = '\\';
 295         p = strchrW(p+1, '\\');
 296     }
 297     HeapFree(GetProcessHeap(), 0, path);
 298 }
 299
 300 /***********************************************************************
 301  *            create_fake_dll
 302  */
 303 BOOL create_fake_dll( const WCHAR *name, const WCHAR *source )
 304 {
 305     HANDLE h;
 306     HMODULE module;
 307     BOOL ret;
 308
 309     /* check for empty name which means to only create the directory */
 310     if (name[strlenW(name) - 1] == '\\')
 311     {
 312         create_directories( name );
 313         return TRUE;
 314     }
 315
 316     /* first check for an existing file */
 317     h = CreateFileW( name, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL );
 318     if (h != INVALID_HANDLE_VALUE)
 319     {
 320         if (!is_fake_dll( h ))
 321         {
 322             TRACE( "%s is not a fake dll, not overwriting it\n", debugstr_w(name) );
 323             CloseHandle( h );
 324             return TRUE;
 325         }
 326         /* truncate the file */
 327         SetFilePointer( h, 0, NULL, FILE_BEGIN );
 328         SetEndOfFile( h );
 329     }
 330     else
 331     {
 332         if (GetLastError() == ERROR_PATH_NOT_FOUND) create_directories( name );
 333
 334         h = CreateFileW( name, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL );
 335         if (h == INVALID_HANDLE_VALUE)
 336         {
 337             ERR( "failed to create %s (error=%u)\n", debugstr_w(name), GetLastError() );
 338             return FALSE;
 339         }
 340     }
 341
 342     module = LoadLibraryW( source );
 343
 344     ret = build_fake_dll( h, module );
 345
 346     CloseHandle( h );
 347     if (module) FreeLibrary( module );
 348     if (!ret) DeleteFileW( name );
 349     return ret;
 350 }