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 "winver.h"
  31 #include "winnt.h"
  32 #include "winternl.h"
  33 #include "wine/unicode.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(setupapi);
  37
  38 static const char fakedll_signature[] = "Wine placeholder DLL";
  39
  40 static const unsigned int file_alignment = 512;
  41 static const unsigned int section_alignment = 4096;
  42
  43 struct dll_info
  44 {
  45     HANDLE            handle;
  46     IMAGE_NT_HEADERS *nt;
  47     DWORD             file_pos;
  48     DWORD             mem_pos;
  49 };
  50
  51 #define ALIGN(size,align) (((size) + (align) - 1) & ~((align) - 1))
  52
  53 /* contents of the dll sections */
  54
  55 static const BYTE dll_code_section[] = { 0x31, 0xc0,          /* xor %eax,%eax */
  56                                          0xc2, 0x0c, 0x00 };  /* ret $12 */
  57
  58 static const BYTE exe_code_section[] = { 0xb8, 0x01, 0x00, 0x00, 0x00,  /* movl $1,%eax */
  59                                          0xc2, 0x04, 0x00 };            /* ret $4 */
  60
  61 static const IMAGE_BASE_RELOCATION reloc_section;  /* empty relocs */
  62
  63
  64 /* wrapper for WriteFile */
  65 static inline BOOL xwrite( struct dll_info *info, const void *data, DWORD size, DWORD offset )
  66 {
  67     DWORD res;
  68
  69     return (SetFilePointer( info->handle, offset, NULL, FILE_BEGIN ) != INVALID_SET_FILE_POINTER &&
  70             WriteFile( info->handle, data, size, &res, NULL ) &&
  71             res == size);
  72 }
  73
  74 /* add a new section to the dll NT header */
  75 static void add_section( struct dll_info *info, const char *name, DWORD size, DWORD flags )
  76 {
  77     IMAGE_SECTION_HEADER *sec = (IMAGE_SECTION_HEADER *)(info->nt + 1);
  78
  79     sec += info->nt->FileHeader.NumberOfSections;
  80     memcpy( (char *)sec->Name, name, min( strlen(name), sizeof(sec->Name)) );
  81     sec->Misc.VirtualSize = ALIGN( size, section_alignment );
  82     sec->VirtualAddress   = info->mem_pos;
  83     sec->SizeOfRawData    = size;
  84     sec->PointerToRawData = info->file_pos;
  85     sec->Characteristics  = flags;
  86     info->file_pos += ALIGN( size, file_alignment );
  87     info->mem_pos  += ALIGN( size, section_alignment );
  88     info->nt->FileHeader.NumberOfSections++;
  89 }
  90
  91 /* add a data directory to the dll NT header */
  92 static inline void add_directory( struct dll_info *info, unsigned int idx, DWORD rva, DWORD size )
  93 {
  94     info->nt->OptionalHeader.DataDirectory[idx].VirtualAddress = rva;
  95     info->nt->OptionalHeader.DataDirectory[idx].Size = size;
  96 }
  97
  98 /* find the limits of the resource data */
  99 static void get_resource_data( const IMAGE_RESOURCE_DIRECTORY *dir, const BYTE *root,
 100                                DWORD *rva_start, DWORD *rva_end )
 101 {
 102     const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 103     int i;
 104
 105     entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 106     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 107     {
 108         const void *ptr = root + entry->u2.s3.OffsetToDirectory;
 109         if (entry->u2.s3.DataIsDirectory) get_resource_data( ptr, root, rva_start, rva_end );
 110         else
 111         {
 112             const IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 113             *rva_start = min( *rva_start, data->OffsetToData );
 114             *rva_end = max( *rva_end, data->OffsetToData + data->Size );
 115         }
 116     }
 117 }
 118
 119 /* fixup RVAs of resource data */
 120 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 121 {
 122     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 123     int i;
 124
 125     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 126     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 127     {
 128         void *ptr = root + entry->u2.s3.OffsetToDirectory;
 129         if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
 130         else
 131         {
 132             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 133             if (data->OffsetToData) data->OffsetToData += delta;
 134         }
 135     }
 136 }
 137
 138 /* add version resources to the dll by copying them from the source module */
 139 static BOOL add_version_resource( HMODULE module, struct dll_info *dll_info )
 140 {
 141     BOOL ret = FALSE;
 142     DWORD rva_start = ~0U, rva_end = 0, dir_size, total_size;
 143     const IMAGE_RESOURCE_DIRECTORY *basedir;
 144     const BYTE *data_start, *root;
 145     BYTE *buffer;
 146
 147     if (!module) return TRUE;
 148     if (LdrFindResourceDirectory_U( module, NULL, 0, &basedir ) != STATUS_SUCCESS) return TRUE;
 149     root = (const BYTE *)basedir;
 150     get_resource_data( basedir, root, &rva_start, &rva_end );
 151     data_start = (const BYTE *)module + rva_start;
 152     if (data_start <= root) return FALSE;
 153     dir_size = data_start - root;
 154     if (!(buffer = HeapAlloc( GetProcessHeap(), 0, dir_size ))) return FALSE;
 155     memcpy( buffer, root, dir_size );
 156     fixup_resources( (IMAGE_RESOURCE_DIRECTORY *)buffer, buffer, dll_info->mem_pos + dir_size - rva_start );
 157     if (!xwrite( dll_info, buffer, dir_size, dll_info->file_pos )) goto done;
 158     if (!xwrite( dll_info, data_start, rva_end - rva_start, dll_info->file_pos + dir_size )) goto done;
 159     total_size = dir_size + rva_end - rva_start;
 160     add_directory( dll_info, IMAGE_DIRECTORY_ENTRY_RESOURCE, dll_info->mem_pos, total_size );
 161     add_section( dll_info, ".rsrc", total_size, IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ );
 162     ret = TRUE;
 163 done:
 164     HeapFree( GetProcessHeap(), 0, buffer );
 165     return ret;
 166 }
 167
 168 /* build a complete fake dll, optionally using module as a source */
 169 static BOOL build_fake_dll( HANDLE file, HMODULE module )
 170 {
 171     IMAGE_DOS_HEADER *dos;
 172     IMAGE_NT_HEADERS *nt;
 173     const IMAGE_NT_HEADERS *src_nt = NULL;
 174     struct dll_info info;
 175     BYTE *buffer;
 176     BOOL ret = FALSE;
 177     DWORD lfanew = (sizeof(*dos) + sizeof(fakedll_signature) + 15) & ~15;
 178     DWORD size, header_size = lfanew + sizeof(*nt);
 179
 180     info.handle = file;
 181     buffer = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, header_size + 8 * sizeof(IMAGE_SECTION_HEADER) );
 182
 183     dos = (IMAGE_DOS_HEADER *)buffer;
 184     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 185     dos->e_cblp     = sizeof(*dos);
 186     dos->e_cp       = 1;
 187     dos->e_cparhdr  = lfanew / 16;
 188     dos->e_minalloc = 0;
 189     dos->e_maxalloc = 0xffff;
 190     dos->e_ss       = 0x0000;
 191     dos->e_sp       = 0x00b8;
 192     dos->e_lfarlc   = lfanew;
 193     dos->e_lfanew   = lfanew;
 194     memcpy( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
 195
 196     nt = info.nt = (IMAGE_NT_HEADERS *)(buffer + lfanew);
 197     src_nt = RtlImageNtHeader( module );
 198     /* some fields are copied from the source dll */
 199 #define SET(field,def) nt->field = src_nt ? src_nt->field : def
 200     SET( FileHeader.Machine, IMAGE_FILE_MACHINE_I386 );
 201     SET( FileHeader.TimeDateStamp, 0 );
 202     SET( FileHeader.Characteristics, IMAGE_FILE_DLL );
 203     SET( OptionalHeader.MajorLinkerVersion, 1 );
 204     SET( OptionalHeader.MinorLinkerVersion, 0 );
 205     SET( OptionalHeader.MajorOperatingSystemVersion, 1 );
 206     SET( OptionalHeader.MinorOperatingSystemVersion, 0 );
 207     SET( OptionalHeader.MajorImageVersion, 1 );
 208     SET( OptionalHeader.MinorImageVersion, 0 );
 209     SET( OptionalHeader.MajorSubsystemVersion, 4 );
 210     SET( OptionalHeader.MinorSubsystemVersion, 0 );
 211     SET( OptionalHeader.Win32VersionValue, 0 );
 212     SET( OptionalHeader.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI );
 213     SET( OptionalHeader.DllCharacteristics, 0 );
 214     SET( OptionalHeader.SizeOfStackReserve, 0 );
 215     SET( OptionalHeader.SizeOfStackCommit, 0 );
 216     SET( OptionalHeader.SizeOfHeapReserve, 0 );
 217     SET( OptionalHeader.SizeOfHeapCommit, 0 );
 218 #undef SET
 219     /* other fields have fixed values */
 220     nt->Signature                              = IMAGE_NT_SIGNATURE;
 221     nt->FileHeader.NumberOfSections            = 0;
 222     nt->FileHeader.SizeOfOptionalHeader        = IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
 223     nt->OptionalHeader.Magic                   = IMAGE_NT_OPTIONAL_HDR_MAGIC;
 224     nt->OptionalHeader.ImageBase               = 0x10000000;
 225     nt->OptionalHeader.SectionAlignment        = section_alignment;
 226     nt->OptionalHeader.FileAlignment           = file_alignment;
 227     nt->OptionalHeader.NumberOfRvaAndSizes     = IMAGE_NUMBEROF_DIRECTORY_ENTRIES;
 228
 229     header_size = (BYTE *)(nt + 1) - buffer;
 230     info.mem_pos  = ALIGN( header_size, section_alignment );
 231     info.file_pos = ALIGN( header_size, file_alignment );
 232
 233     nt->OptionalHeader.AddressOfEntryPoint = info.mem_pos;
 234     nt->OptionalHeader.BaseOfCode          = info.mem_pos;
 235
 236     if (nt->FileHeader.Characteristics & IMAGE_FILE_DLL)
 237     {
 238         size = sizeof(dll_code_section);
 239         if (!xwrite( &info, dll_code_section, size, info.file_pos )) goto done;
 240     }
 241     else
 242     {
 243         size = sizeof(exe_code_section);
 244         if (!xwrite( &info, exe_code_section, size, info.file_pos )) goto done;
 245     }
 246     nt->OptionalHeader.SizeOfCode = size;
 247     add_section( &info, ".text", size, IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ );
 248
 249     if (!xwrite( &info, &reloc_section, sizeof(reloc_section), info.file_pos )) goto done;
 250     add_directory( &info, IMAGE_DIRECTORY_ENTRY_BASERELOC, info.mem_pos, sizeof(reloc_section) );
 251     add_section( &info, ".reloc", sizeof(reloc_section),
 252                  IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_READ );
 253
 254     if (!add_version_resource( module, &info )) goto done;
 255
 256     header_size += nt->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER);
 257     nt->OptionalHeader.SizeOfHeaders = ALIGN( header_size, file_alignment );
 258     nt->OptionalHeader.SizeOfImage   = ALIGN( info.mem_pos, section_alignment );
 259     ret = xwrite( &info, buffer, header_size, 0 );
 260 done:
 261     HeapFree( GetProcessHeap(), 0, buffer );
 262     return ret;
 263 }
 264
 265 /* check if an existing file is a fake dll so that we can overwrite it */
 266 static BOOL is_fake_dll( HANDLE h )
 267 {
 268     IMAGE_DOS_HEADER *dos;
 269     DWORD size;
 270     BYTE buffer[sizeof(*dos) + sizeof(fakedll_signature)];
 271
 272     if (!ReadFile( h, buffer, sizeof(buffer), &size, NULL ) || size != sizeof(buffer))
 273         return FALSE;
 274     dos = (IMAGE_DOS_HEADER *)buffer;
 275     if (dos->e_magic != IMAGE_DOS_SIGNATURE) return FALSE;
 276     if (dos->e_lfanew < size) return FALSE;
 277     return !memcmp( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
 278 }
 279
 280 /***********************************************************************
 281  *            create_fake_dll
 282  */
 283 BOOL create_fake_dll( const WCHAR *name, const WCHAR *source )
 284 {
 285     HANDLE h;
 286     HMODULE module;
 287     BOOL ret;
 288
 289     /* first check for an existing file */
 290     h = CreateFileW( name, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL );
 291     if (h != INVALID_HANDLE_VALUE)
 292     {
 293         if (!is_fake_dll( h ))
 294         {
 295             TRACE( "%s is not a fake dll, not overwriting it\n", debugstr_w(name) );
 296             CloseHandle( h );
 297             return TRUE;
 298         }
 299         /* truncate the file */
 300         SetFilePointer( h, 0, NULL, FILE_BEGIN );
 301         SetEndOfFile( h );
 302     }
 303     else
 304     {
 305         h = CreateFileW( name, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL );
 306         if (h == INVALID_HANDLE_VALUE)
 307         {
 308             WARN( "failed to create %s\n", debugstr_w(name) );
 309             return FALSE;
 310         }
 311     }
 312
 313     module = LoadLibraryW( source );
 314
 315     ret = build_fake_dll( h, module );
 316
 317     CloseHandle( h );
 318     if (module) FreeLibrary( module );
 319     if (!ret) DeleteFileW( name );
 320     return ret;
 321 }