343 lines
13 KiB
C
343 lines
13 KiB
C
/*
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* Creation of Wine fake dlls for apps that access the dll file directly.
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*
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* Copyright 2006 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdarg.h>
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#define NONAMELESSSTRUCT
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#define NONAMELESSUNION
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winbase.h"
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#include "winuser.h"
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#include "winnt.h"
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#include "winternl.h"
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#include "wine/unicode.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(setupapi);
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static const char fakedll_signature[] = "Wine placeholder DLL";
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static const unsigned int file_alignment = 512;
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static const unsigned int section_alignment = 4096;
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struct dll_info
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{
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HANDLE handle;
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IMAGE_NT_HEADERS *nt;
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DWORD file_pos;
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DWORD mem_pos;
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};
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#define ALIGN(size,align) (((size) + (align) - 1) & ~((align) - 1))
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/* contents of the dll sections */
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static const BYTE dll_code_section[] = { 0x31, 0xc0, /* xor %eax,%eax */
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0xc2, 0x0c, 0x00 }; /* ret $12 */
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static const BYTE exe_code_section[] = { 0xb8, 0x01, 0x00, 0x00, 0x00, /* movl $1,%eax */
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0xc2, 0x04, 0x00 }; /* ret $4 */
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static const IMAGE_BASE_RELOCATION reloc_section; /* empty relocs */
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/* wrapper for WriteFile */
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static inline BOOL xwrite( struct dll_info *info, const void *data, DWORD size, DWORD offset )
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{
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DWORD res;
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return (SetFilePointer( info->handle, offset, NULL, FILE_BEGIN ) != INVALID_SET_FILE_POINTER &&
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WriteFile( info->handle, data, size, &res, NULL ) &&
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res == size);
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}
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/* add a new section to the dll NT header */
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static void add_section( struct dll_info *info, const char *name, DWORD size, DWORD flags )
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{
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IMAGE_SECTION_HEADER *sec = (IMAGE_SECTION_HEADER *)(info->nt + 1);
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sec += info->nt->FileHeader.NumberOfSections;
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memcpy( (char *)sec->Name, name, min( strlen(name), sizeof(sec->Name)) );
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sec->Misc.VirtualSize = ALIGN( size, section_alignment );
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sec->VirtualAddress = info->mem_pos;
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sec->SizeOfRawData = size;
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sec->PointerToRawData = info->file_pos;
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sec->Characteristics = flags;
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info->file_pos += ALIGN( size, file_alignment );
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info->mem_pos += ALIGN( size, section_alignment );
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info->nt->FileHeader.NumberOfSections++;
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}
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/* add a data directory to the dll NT header */
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static inline void add_directory( struct dll_info *info, unsigned int idx, DWORD rva, DWORD size )
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{
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info->nt->OptionalHeader.DataDirectory[idx].VirtualAddress = rva;
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info->nt->OptionalHeader.DataDirectory[idx].Size = size;
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}
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/* find the limits of the resource data */
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static void get_resource_data( const IMAGE_RESOURCE_DIRECTORY *dir, const BYTE *root,
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DWORD *rva_start, DWORD *rva_end )
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{
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const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
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int i;
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entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
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for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
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{
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const void *ptr = root + entry->u2.s3.OffsetToDirectory;
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if (entry->u2.s3.DataIsDirectory) get_resource_data( ptr, root, rva_start, rva_end );
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else
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{
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const IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
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*rva_start = min( *rva_start, data->OffsetToData );
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*rva_end = max( *rva_end, data->OffsetToData + data->Size );
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}
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}
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}
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/* fixup RVAs of resource data */
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static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
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{
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IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
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int i;
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entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
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for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
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{
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void *ptr = root + entry->u2.s3.OffsetToDirectory;
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if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, delta );
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else
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{
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IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
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if (data->OffsetToData) data->OffsetToData += delta;
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}
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}
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}
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/* add version resources to the dll by copying them from the source module */
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static BOOL add_version_resource( HMODULE module, struct dll_info *dll_info )
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{
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BOOL ret = FALSE;
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DWORD rva_start = ~0U, rva_end = 0, dir_size, total_size;
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const IMAGE_RESOURCE_DIRECTORY *basedir;
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const BYTE *data_start, *root;
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BYTE *buffer;
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if (!module) return TRUE;
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if (LdrFindResourceDirectory_U( module, NULL, 0, &basedir ) != STATUS_SUCCESS) return TRUE;
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root = (const BYTE *)basedir;
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get_resource_data( basedir, root, &rva_start, &rva_end );
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data_start = (const BYTE *)module + rva_start;
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if (data_start <= root) return FALSE;
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dir_size = data_start - root;
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if (!(buffer = HeapAlloc( GetProcessHeap(), 0, dir_size ))) return FALSE;
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memcpy( buffer, root, dir_size );
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fixup_resources( (IMAGE_RESOURCE_DIRECTORY *)buffer, buffer, dll_info->mem_pos + dir_size - rva_start );
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if (!xwrite( dll_info, buffer, dir_size, dll_info->file_pos )) goto done;
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if (!xwrite( dll_info, data_start, rva_end - rva_start, dll_info->file_pos + dir_size )) goto done;
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total_size = dir_size + rva_end - rva_start;
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add_directory( dll_info, IMAGE_DIRECTORY_ENTRY_RESOURCE, dll_info->mem_pos, total_size );
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add_section( dll_info, ".rsrc", total_size, IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ );
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ret = TRUE;
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done:
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HeapFree( GetProcessHeap(), 0, buffer );
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return ret;
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}
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/* build a complete fake dll, optionally using module as a source */
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static BOOL build_fake_dll( HANDLE file, HMODULE module )
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{
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IMAGE_DOS_HEADER *dos;
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IMAGE_NT_HEADERS *nt;
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const IMAGE_NT_HEADERS *src_nt = NULL;
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struct dll_info info;
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BYTE *buffer;
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BOOL ret = FALSE;
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DWORD lfanew = (sizeof(*dos) + sizeof(fakedll_signature) + 15) & ~15;
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DWORD size, header_size = lfanew + sizeof(*nt);
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info.handle = file;
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buffer = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, header_size + 8 * sizeof(IMAGE_SECTION_HEADER) );
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dos = (IMAGE_DOS_HEADER *)buffer;
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dos->e_magic = IMAGE_DOS_SIGNATURE;
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dos->e_cblp = sizeof(*dos);
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dos->e_cp = 1;
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dos->e_cparhdr = lfanew / 16;
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dos->e_minalloc = 0;
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dos->e_maxalloc = 0xffff;
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dos->e_ss = 0x0000;
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dos->e_sp = 0x00b8;
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dos->e_lfarlc = lfanew;
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dos->e_lfanew = lfanew;
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memcpy( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
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nt = info.nt = (IMAGE_NT_HEADERS *)(buffer + lfanew);
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src_nt = RtlImageNtHeader( module );
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/* some fields are copied from the source dll */
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#define SET(field,def) nt->field = src_nt ? src_nt->field : def
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SET( FileHeader.Machine, IMAGE_FILE_MACHINE_I386 );
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SET( FileHeader.TimeDateStamp, 0 );
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SET( FileHeader.Characteristics, IMAGE_FILE_DLL );
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SET( OptionalHeader.MajorLinkerVersion, 1 );
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SET( OptionalHeader.MinorLinkerVersion, 0 );
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SET( OptionalHeader.MajorOperatingSystemVersion, 1 );
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SET( OptionalHeader.MinorOperatingSystemVersion, 0 );
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SET( OptionalHeader.MajorImageVersion, 1 );
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SET( OptionalHeader.MinorImageVersion, 0 );
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SET( OptionalHeader.MajorSubsystemVersion, 4 );
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SET( OptionalHeader.MinorSubsystemVersion, 0 );
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SET( OptionalHeader.Win32VersionValue, 0 );
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SET( OptionalHeader.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI );
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SET( OptionalHeader.DllCharacteristics, 0 );
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SET( OptionalHeader.SizeOfStackReserve, 0 );
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SET( OptionalHeader.SizeOfStackCommit, 0 );
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SET( OptionalHeader.SizeOfHeapReserve, 0 );
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SET( OptionalHeader.SizeOfHeapCommit, 0 );
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#undef SET
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/* other fields have fixed values */
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nt->Signature = IMAGE_NT_SIGNATURE;
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nt->FileHeader.NumberOfSections = 0;
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nt->FileHeader.SizeOfOptionalHeader = IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
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nt->OptionalHeader.Magic = IMAGE_NT_OPTIONAL_HDR_MAGIC;
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nt->OptionalHeader.ImageBase = 0x10000000;
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nt->OptionalHeader.SectionAlignment = section_alignment;
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nt->OptionalHeader.FileAlignment = file_alignment;
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nt->OptionalHeader.NumberOfRvaAndSizes = IMAGE_NUMBEROF_DIRECTORY_ENTRIES;
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header_size = (BYTE *)(nt + 1) - buffer;
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info.mem_pos = ALIGN( header_size, section_alignment );
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info.file_pos = ALIGN( header_size, file_alignment );
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nt->OptionalHeader.AddressOfEntryPoint = info.mem_pos;
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nt->OptionalHeader.BaseOfCode = info.mem_pos;
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if (nt->FileHeader.Characteristics & IMAGE_FILE_DLL)
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{
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size = sizeof(dll_code_section);
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if (!xwrite( &info, dll_code_section, size, info.file_pos )) goto done;
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}
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else
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{
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size = sizeof(exe_code_section);
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if (!xwrite( &info, exe_code_section, size, info.file_pos )) goto done;
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}
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nt->OptionalHeader.SizeOfCode = size;
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add_section( &info, ".text", size, IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ );
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if (!xwrite( &info, &reloc_section, sizeof(reloc_section), info.file_pos )) goto done;
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add_directory( &info, IMAGE_DIRECTORY_ENTRY_BASERELOC, info.mem_pos, sizeof(reloc_section) );
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add_section( &info, ".reloc", sizeof(reloc_section),
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IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_READ );
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if (!add_version_resource( module, &info )) goto done;
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header_size += nt->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER);
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nt->OptionalHeader.SizeOfHeaders = ALIGN( header_size, file_alignment );
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nt->OptionalHeader.SizeOfImage = ALIGN( info.mem_pos, section_alignment );
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ret = xwrite( &info, buffer, header_size, 0 );
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done:
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HeapFree( GetProcessHeap(), 0, buffer );
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return ret;
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}
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/* check if an existing file is a fake dll so that we can overwrite it */
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static BOOL is_fake_dll( HANDLE h )
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{
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IMAGE_DOS_HEADER *dos;
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DWORD size;
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BYTE buffer[sizeof(*dos) + sizeof(fakedll_signature)];
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if (!ReadFile( h, buffer, sizeof(buffer), &size, NULL ) || size != sizeof(buffer))
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return FALSE;
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dos = (IMAGE_DOS_HEADER *)buffer;
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if (dos->e_magic != IMAGE_DOS_SIGNATURE) return FALSE;
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if (dos->e_lfanew < size) return FALSE;
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return !memcmp( dos + 1, fakedll_signature, sizeof(fakedll_signature) );
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}
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/***********************************************************************
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* create_fake_dll
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*/
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BOOL create_fake_dll( const WCHAR *name, const WCHAR *source )
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{
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HANDLE h;
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HMODULE module;
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BOOL ret;
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/* first check for an existing file */
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h = CreateFileW( name, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL );
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if (h != INVALID_HANDLE_VALUE)
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{
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if (!is_fake_dll( h ))
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{
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TRACE( "%s is not a fake dll, not overwriting it\n", debugstr_w(name) );
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CloseHandle( h );
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return TRUE;
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}
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/* truncate the file */
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SetFilePointer( h, 0, NULL, FILE_BEGIN );
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SetEndOfFile( h );
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}
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else
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{
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if (GetLastError() == ERROR_PATH_NOT_FOUND)
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{
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WCHAR *path;
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WCHAR *pathel;
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/* create the directory/directories */
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path = HeapAlloc(GetProcessHeap(), 0, (strlenW(name) + 1)*sizeof(WCHAR));
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strcpyW(path, name);
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pathel = strchrW(path, '\\');
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while (pathel != NULL)
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{
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*pathel = 0;
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if (!CreateDirectoryW(path, NULL))
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TRACE("Couldn't create directory %s - error: %d\n", wine_dbgstr_w(path), GetLastError());
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*pathel = '\\';
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pathel = strchrW(pathel+1, '\\');
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}
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HeapFree(GetProcessHeap(), 0, path);
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}
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h = CreateFileW( name, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL );
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if (h == INVALID_HANDLE_VALUE)
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{
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ERR( "failed to create %s (error=%u)\n", debugstr_w(name), GetLastError() );
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return FALSE;
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}
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}
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module = LoadLibraryW( source );
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ret = build_fake_dll( h, module );
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CloseHandle( h );
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if (module) FreeLibrary( module );
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if (!ret) DeleteFileW( name );
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return ret;
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}
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