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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdarg.h>
#define NONAMELESSSTRUCT
#define NONAMELESSUNION
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winver.h"
#include "winnt.h"
#include "winternl.h"
#include "wine/unicode.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;
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( (char *)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;
}
/* find the limits of the resource data */
static void get_resource_data( const IMAGE_RESOURCE_DIRECTORY *dir, const BYTE *root,
DWORD *rva_start, DWORD *rva_end )
{
const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
int i;
entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
{
const void *ptr = root + entry->u2.s3.OffsetToDirectory;
if (entry->u2.s3.DataIsDirectory) get_resource_data( ptr, root, rva_start, rva_end );
else
{
const IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
*rva_start = min( *rva_start, data->OffsetToData );
*rva_end = max( *rva_end, data->OffsetToData + data->Size );
}
}
}
/* fixup RVAs of resource data */
static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
{
IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
int i;
entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
{
void *ptr = root + entry->u2.s3.OffsetToDirectory;
if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
else
{
IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
if (data->OffsetToData) data->OffsetToData += delta;
}
}
}
/* add version resources to the dll by copying them from the source module */
static BOOL add_version_resource( HMODULE module, struct dll_info *dll_info )
{
BOOL ret = FALSE;
DWORD rva_start = ~0U, rva_end = 0, dir_size, total_size;
const IMAGE_RESOURCE_DIRECTORY *basedir;
const BYTE *data_start, *root;
BYTE *buffer;
if (!module) return TRUE;
if (LdrFindResourceDirectory_U( module, NULL, 0, &basedir ) != STATUS_SUCCESS) return TRUE;
root = (const BYTE *)basedir;
get_resource_data( basedir, root, &rva_start, &rva_end );
data_start = (const BYTE *)module + rva_start;
if (data_start <= root) return FALSE;
dir_size = data_start - root;
if (!(buffer = HeapAlloc( GetProcessHeap(), 0, dir_size ))) return FALSE;
memcpy( buffer, root, dir_size );
fixup_resources( (IMAGE_RESOURCE_DIRECTORY *)buffer, buffer, dll_info->mem_pos + dir_size - rva_start );
if (!xwrite( dll_info, buffer, dir_size, dll_info->file_pos )) goto done;
if (!xwrite( dll_info, data_start, rva_end - rva_start, dll_info->file_pos + dir_size )) goto done;
total_size = dir_size + rva_end - rva_start;
add_directory( dll_info, IMAGE_DIRECTORY_ENTRY_RESOURCE, dll_info->mem_pos, total_size );
add_section( dll_info, ".rsrc", total_size, IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ );
ret = TRUE;
done:
HeapFree( GetProcessHeap(), 0, buffer );
return ret;
}
/* build a complete fake dll, optionally using module as a source */
static BOOL build_fake_dll( HANDLE file, HMODULE module )
{
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
const IMAGE_NT_HEADERS *src_nt = NULL;
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);
src_nt = RtlImageNtHeader( module );
/* some fields are copied from the source dll */
#define SET(field,def) nt->field = src_nt ? src_nt->field : def
SET( FileHeader.Machine, IMAGE_FILE_MACHINE_I386 );
SET( FileHeader.TimeDateStamp, 0 );
SET( FileHeader.Characteristics, IMAGE_FILE_DLL );
SET( OptionalHeader.MajorLinkerVersion, 1 );
SET( OptionalHeader.MinorLinkerVersion, 0 );
SET( OptionalHeader.MajorOperatingSystemVersion, 1 );
SET( OptionalHeader.MinorOperatingSystemVersion, 0 );
SET( OptionalHeader.MajorImageVersion, 1 );
SET( OptionalHeader.MinorImageVersion, 0 );
SET( OptionalHeader.MajorSubsystemVersion, 4 );
SET( OptionalHeader.MinorSubsystemVersion, 0 );
SET( OptionalHeader.Win32VersionValue, 0 );
SET( OptionalHeader.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI );
SET( OptionalHeader.DllCharacteristics, 0 );
SET( OptionalHeader.SizeOfStackReserve, 0 );
SET( OptionalHeader.SizeOfStackCommit, 0 );
SET( OptionalHeader.SizeOfHeapReserve, 0 );
SET( OptionalHeader.SizeOfHeapCommit, 0 );
#undef SET
/* 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 );
if (!add_version_resource( module, &info )) goto done;
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_fake_dll
*/
BOOL create_fake_dll( const WCHAR *name, const WCHAR *source )
{
HANDLE h;
HMODULE module;
BOOL ret;
/* first check for an existing file */
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 TRUE;
}
/* truncate the file */
SetFilePointer( h, 0, NULL, FILE_BEGIN );
SetEndOfFile( h );
}
else
{
h = CreateFileW( name, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL );
if (h == INVALID_HANDLE_VALUE)
{
WARN( "failed to create %s\n", debugstr_w(name) );
return FALSE;
}
}
module = LoadLibraryW( source );
ret = build_fake_dll( h, module );
CloseHandle( h );
if (module) FreeLibrary( module );
if (!ret) DeleteFileW( name );
return ret;
}
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