/* * 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 <stdarg.h> #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/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( 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); if (module) 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 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); } /*********************************************************************** * create_fake_dll */ BOOL create_fake_dll( const WCHAR *name, const WCHAR *source ) { HANDLE h; HMODULE module; BOOL ret; /* check for empty name which means to only create the directory */ if (name[strlenW(name) - 1] == '\\') { create_directories( name ); return TRUE; } /* 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 { 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 FALSE; } } module = LoadLibraryW( source ); ret = build_fake_dll( h, module ); CloseHandle( h ); if (module) FreeLibrary( module ); if (!ret) DeleteFileW( name ); return ret; }