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478 lines
14 KiB
478 lines
14 KiB
![]()
2 years ago
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/*
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lib_custom_win.c - win32 custom dlls loader
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Copyright (C) 2008 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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*/
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#include "common.h"
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#if XASH_LIB == LIB_WIN32 && XASH_X86
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#include "lib_win.h"
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#define NUMBER_OF_DIRECTORY_ENTRIES 16
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#ifndef IMAGE_SIZEOF_BASE_RELOCATION
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#define IMAGE_SIZEOF_BASE_RELOCATION ( sizeof( IMAGE_BASE_RELOCATION ))
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#endif
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typedef struct
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{
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PIMAGE_NT_HEADERS headers;
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byte *codeBase;
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void **modules;
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int numModules;
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int initialized;
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} MEMORYMODULE, *PMEMORYMODULE;
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// Protection flags for memory pages (Executable, Readable, Writeable)
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static int ProtectionFlags[2][2][2] =
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{
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{
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{ PAGE_NOACCESS, PAGE_WRITECOPY }, // not executable
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{ PAGE_READONLY, PAGE_READWRITE },
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},
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{
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{ PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY }, // executable
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{ PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE },
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},
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};
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typedef BOOL (WINAPI *DllEntryProc)( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved );
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#define GET_HEADER_DICTIONARY( module, idx ) &(module)->headers->OptionalHeader.DataDirectory[idx]
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static void CopySections( const byte *data, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module )
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{
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PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION( module->headers );
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byte *codeBase = module->codeBase;
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int i, size;
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byte *dest;
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for( i = 0; i < module->headers->FileHeader.NumberOfSections; i++, section++ )
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{
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if( section->SizeOfRawData == 0 )
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{
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// section doesn't contain data in the dll itself, but may define
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// uninitialized data
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size = old_headers->OptionalHeader.SectionAlignment;
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if( size > 0 )
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{
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dest = (byte *)VirtualAlloc((byte *)CALCULATE_ADDRESS(codeBase, section->VirtualAddress), size, MEM_COMMIT, PAGE_READWRITE );
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section->Misc.PhysicalAddress = (DWORD)dest;
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memset( dest, 0, size );
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}
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// section is empty
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continue;
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}
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// commit memory block and copy data from dll
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dest = (byte *)VirtualAlloc((byte *)CALCULATE_ADDRESS(codeBase, section->VirtualAddress), section->SizeOfRawData, MEM_COMMIT, PAGE_READWRITE );
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memcpy( dest, (byte *)CALCULATE_ADDRESS(data, section->PointerToRawData), section->SizeOfRawData );
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section->Misc.PhysicalAddress = (DWORD)dest;
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}
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}
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static void FreeSections( PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module )
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{
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PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
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byte *codeBase = module->codeBase;
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int i, size;
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for( i = 0; i < module->headers->FileHeader.NumberOfSections; i++, section++ )
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{
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if( section->SizeOfRawData == 0 )
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{
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size = old_headers->OptionalHeader.SectionAlignment;
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if( size > 0 )
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{
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VirtualFree((byte *)CALCULATE_ADDRESS( codeBase, section->VirtualAddress ), size, MEM_DECOMMIT );
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section->Misc.PhysicalAddress = 0;
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}
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continue;
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}
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VirtualFree((byte *)CALCULATE_ADDRESS( codeBase, section->VirtualAddress ), section->SizeOfRawData, MEM_DECOMMIT );
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section->Misc.PhysicalAddress = 0;
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}
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}
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static void FinalizeSections( MEMORYMODULE *module )
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{
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PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION( module->headers );
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int i;
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// loop through all sections and change access flags
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for( i = 0; i < module->headers->FileHeader.NumberOfSections; i++, section++ )
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{
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DWORD protect, oldProtect, size;
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int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
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int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;
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int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;
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if( section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE )
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{
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// section is not needed any more and can safely be freed
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VirtualFree((LPVOID)section->Misc.PhysicalAddress, section->SizeOfRawData, MEM_DECOMMIT);
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continue;
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}
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// determine protection flags based on characteristics
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protect = ProtectionFlags[executable][readable][writeable];
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if( section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED )
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protect |= PAGE_NOCACHE;
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// determine size of region
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size = section->SizeOfRawData;
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if( size == 0 )
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{
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if( section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA )
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size = module->headers->OptionalHeader.SizeOfInitializedData;
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else if( section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA )
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size = module->headers->OptionalHeader.SizeOfUninitializedData;
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}
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if( size > 0 )
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{
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// change memory access flags
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if( !VirtualProtect((LPVOID)section->Misc.PhysicalAddress, size, protect, &oldProtect ))
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Sys_Error( "error protecting memory page\n" );
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}
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}
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}
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static void PerformBaseRelocation( MEMORYMODULE *module, DWORD delta )
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{
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY( module, IMAGE_DIRECTORY_ENTRY_BASERELOC );
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byte *codeBase = module->codeBase;
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DWORD i;
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if( directory->Size > 0 )
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{
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PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION)CALCULATE_ADDRESS( codeBase, directory->VirtualAddress );
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for( ; relocation->VirtualAddress > 0; )
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{
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byte *dest = (byte *)CALCULATE_ADDRESS( codeBase, relocation->VirtualAddress );
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word *relInfo = (word *)((byte *)relocation + IMAGE_SIZEOF_BASE_RELOCATION );
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for( i = 0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++ )
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{
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DWORD *patchAddrHL;
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int type, offset;
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// the upper 4 bits define the type of relocation
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type = *relInfo >> 12;
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// the lower 12 bits define the offset
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offset = *relInfo & 0xfff;
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switch( type )
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{
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case IMAGE_REL_BASED_ABSOLUTE:
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// skip relocation
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break;
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case IMAGE_REL_BASED_HIGHLOW:
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// change complete 32 bit address
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patchAddrHL = (DWORD *)CALCULATE_ADDRESS( dest, offset );
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*patchAddrHL += delta;
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break;
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default:
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Con_Reportf( S_ERROR "PerformBaseRelocation: unknown relocation: %d\n", type );
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break;
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}
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}
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// advance to next relocation block
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relocation = (PIMAGE_BASE_RELOCATION)CALCULATE_ADDRESS( relocation, relocation->SizeOfBlock );
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}
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}
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}
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FARPROC MemoryGetProcAddress( void *module, const char *name )
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{
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((MEMORYMODULE *)module, IMAGE_DIRECTORY_ENTRY_EXPORT );
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byte *codeBase = ((PMEMORYMODULE)module)->codeBase;
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PIMAGE_EXPORT_DIRECTORY exports;
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int idx = -1;
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DWORD i, *nameRef;
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WORD *ordinal;
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if( directory->Size == 0 )
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{
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// no export table found
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return NULL;
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}
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exports = (PIMAGE_EXPORT_DIRECTORY)CALCULATE_ADDRESS( codeBase, directory->VirtualAddress );
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if( exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0 )
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{
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// DLL doesn't export anything
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return NULL;
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}
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// search function name in list of exported names
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nameRef = (DWORD *)CALCULATE_ADDRESS( codeBase, exports->AddressOfNames );
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ordinal = (WORD *)CALCULATE_ADDRESS( codeBase, exports->AddressOfNameOrdinals );
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for( i = 0; i < exports->NumberOfNames; i++, nameRef++, ordinal++ )
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{
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// GetProcAddress case insensative ?????
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if( !Q_stricmp( name, (const char *)CALCULATE_ADDRESS( codeBase, *nameRef )))
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{
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idx = *ordinal;
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break;
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}
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}
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if( idx == -1 )
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{
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// exported symbol not found
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return NULL;
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}
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if((DWORD)idx > exports->NumberOfFunctions )
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{
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// name <-> ordinal number don't match
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return NULL;
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}
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// addressOfFunctions contains the RVAs to the "real" functions
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return (FARPROC)CALCULATE_ADDRESS( codeBase, *(DWORD *)CALCULATE_ADDRESS( codeBase, exports->AddressOfFunctions + (idx * 4)));
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}
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static int BuildImportTable( MEMORYMODULE *module )
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{
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY( module, IMAGE_DIRECTORY_ENTRY_IMPORT );
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byte *codeBase = module->codeBase;
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int result = 1;
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if( directory->Size > 0 )
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{
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PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR)CALCULATE_ADDRESS( codeBase, directory->VirtualAddress );
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for( ; !IsBadReadPtr( importDesc, sizeof( IMAGE_IMPORT_DESCRIPTOR )) && importDesc->Name; importDesc++ )
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{
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DWORD *thunkRef, *funcRef;
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LPCSTR libname;
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void *handle;
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libname = (LPCSTR)CALCULATE_ADDRESS( codeBase, importDesc->Name );
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handle = COM_LoadLibrary( libname, false, true );
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if( handle == NULL )
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{
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Con_Printf( S_ERROR "couldn't load library %s\n", libname );
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result = 0;
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break;
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}
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module->modules = (void *)Mem_Realloc( host.mempool, module->modules, (module->numModules + 1) * (sizeof( void* )));
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module->modules[module->numModules++] = handle;
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if( importDesc->OriginalFirstThunk )
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{
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thunkRef = (DWORD *)CALCULATE_ADDRESS( codeBase, importDesc->OriginalFirstThunk );
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funcRef = (DWORD *)CALCULATE_ADDRESS( codeBase, importDesc->FirstThunk );
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}
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else
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{
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// no hint table
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thunkRef = (DWORD *)CALCULATE_ADDRESS( codeBase, importDesc->FirstThunk );
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funcRef = (DWORD *)CALCULATE_ADDRESS( codeBase, importDesc->FirstThunk );
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}
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for( ; *thunkRef; thunkRef++, funcRef++ )
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{
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LPCSTR funcName;
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if( IMAGE_SNAP_BY_ORDINAL( *thunkRef ))
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{
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funcName = (LPCSTR)IMAGE_ORDINAL( *thunkRef );
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*funcRef = (DWORD)COM_GetProcAddress( handle, funcName );
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}
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else
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{
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PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME)CALCULATE_ADDRESS( codeBase, *thunkRef );
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funcName = (LPCSTR)&thunkData->Name;
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*funcRef = (DWORD)COM_GetProcAddress( handle, funcName );
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}
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if( *funcRef == 0 )
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{
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Con_Printf( S_ERROR "%s unable to find address: %s\n", libname, funcName );
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result = 0;
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break;
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}
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}
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if( !result ) break;
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}
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}
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return result;
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}
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void MemoryFreeLibrary( void *hInstance )
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{
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MEMORYMODULE *module = (MEMORYMODULE *)hInstance;
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if( module != NULL )
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{
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int i;
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if( module->initialized != 0 )
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{
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// notify library about detaching from process
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DllEntryProc DllEntry = (DllEntryProc)CALCULATE_ADDRESS( module->codeBase, module->headers->OptionalHeader.AddressOfEntryPoint );
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(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0 );
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module->initialized = 0;
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}
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if( module->modules != NULL )
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{
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// free previously opened libraries
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for( i = 0; i < module->numModules; i++ )
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{
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if( module->modules[i] != NULL )
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COM_FreeLibrary( module->modules[i] );
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}
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Mem_Free( module->modules ); // Mem_Realloc end
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}
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FreeSections( module->headers, module );
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if( module->codeBase != NULL )
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{
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// release memory of library
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VirtualFree( module->codeBase, 0, MEM_RELEASE );
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}
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HeapFree( GetProcessHeap(), 0, module );
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}
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}
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void *MemoryLoadLibrary( const char *name )
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{
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MEMORYMODULE *result = NULL;
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PIMAGE_DOS_HEADER dos_header;
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PIMAGE_NT_HEADERS old_header;
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byte *code, *headers;
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DWORD locationDelta;
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DllEntryProc DllEntry;
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string errorstring;
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qboolean successfull;
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void *data = NULL;
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data = FS_LoadFile( name, NULL, false );
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if( !data )
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{
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Q_sprintf( errorstring, "couldn't load %s", name );
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goto library_error;
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}
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dos_header = (PIMAGE_DOS_HEADER)data;
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if( dos_header->e_magic != IMAGE_DOS_SIGNATURE )
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{
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Q_sprintf( errorstring, "%s it's not a valid executable file", name );
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goto library_error;
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}
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old_header = (PIMAGE_NT_HEADERS)&((const byte *)(data))[dos_header->e_lfanew];
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if( old_header->Signature != IMAGE_NT_SIGNATURE )
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{
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Q_sprintf( errorstring, "%s missing PE header", name );
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goto library_error;
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}
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// reserve memory for image of library
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code = (byte *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase), old_header->OptionalHeader.SizeOfImage, MEM_RESERVE, PAGE_READWRITE );
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if( code == NULL )
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{
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// try to allocate memory at arbitrary position
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code = (byte *)VirtualAlloc( NULL, old_header->OptionalHeader.SizeOfImage, MEM_RESERVE, PAGE_READWRITE );
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}
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if( code == NULL )
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{
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Q_sprintf( errorstring, "%s can't reserve memory", name );
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goto library_error;
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}
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result = (MEMORYMODULE *)HeapAlloc( GetProcessHeap(), 0, sizeof( MEMORYMODULE ));
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result->codeBase = code;
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result->numModules = 0;
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result->modules = NULL;
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result->initialized = 0;
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// XXX: is it correct to commit the complete memory region at once?
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// calling DllEntry raises an exception if we don't...
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VirtualAlloc( code, old_header->OptionalHeader.SizeOfImage, MEM_COMMIT, PAGE_READWRITE );
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// commit memory for headers
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headers = (byte *)VirtualAlloc( code, old_header->OptionalHeader.SizeOfHeaders, MEM_COMMIT, PAGE_READWRITE );
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// copy PE header to code
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memcpy( headers, dos_header, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders );
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result->headers = (PIMAGE_NT_HEADERS)&((const byte *)(headers))[dos_header->e_lfanew];
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|
// update position
|
||
|
result->headers->OptionalHeader.ImageBase = (DWORD)code;
|
||
|
|
||
|
// copy sections from DLL file block to new memory location
|
||
|
CopySections( data, old_header, result );
|
||
|
|
||
|
// adjust base address of imported data
|
||
|
locationDelta = (DWORD)(code - old_header->OptionalHeader.ImageBase);
|
||
|
if( locationDelta != 0 ) PerformBaseRelocation( result, locationDelta );
|
||
|
|
||
|
// load required dlls and adjust function table of imports
|
||
|
if( !BuildImportTable( result ))
|
||
|
{
|
||
|
Q_sprintf( errorstring, "%s failed to build import table", name );
|
||
|
goto library_error;
|
||
|
}
|
||
|
|
||
|
// mark memory pages depending on section headers and release
|
||
|
// sections that are marked as "discardable"
|
||
|
FinalizeSections( result );
|
||
|
|
||
|
// get entry point of loaded library
|
||
|
if( result->headers->OptionalHeader.AddressOfEntryPoint != 0 )
|
||
|
{
|
||
|
DllEntry = (DllEntryProc)CALCULATE_ADDRESS( code, result->headers->OptionalHeader.AddressOfEntryPoint );
|
||
|
if( DllEntry == 0 )
|
||
|
{
|
||
|
Q_sprintf( errorstring, "%s has no entry point", name );
|
||
|
goto library_error;
|
||
|
}
|
||
|
|
||
|
// notify library about attaching to process
|
||
|
successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0 );
|
||
|
if( !successfull )
|
||
|
{
|
||
|
Q_sprintf( errorstring, "can't attach library %s", name );
|
||
|
goto library_error;
|
||
|
}
|
||
|
result->initialized = 1;
|
||
|
}
|
||
|
|
||
|
Mem_Free( data ); // release memory
|
||
|
return (void *)result;
|
||
|
library_error:
|
||
|
// cleanup
|
||
|
if( data ) Mem_Free( data );
|
||
|
MemoryFreeLibrary( result );
|
||
|
Con_Printf( S_ERROR "LoadLibrary: %s\n", errorstring );
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
#endif // XASH_LIB == LIB_WIN32 && XASH_X86
|