116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
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/*
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Locate the relative address of LoadLibraryW in kernel32.dll. This is needed
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to get the 32-bit address from 64-bit code, and it eliminates the possibility
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of it already being hooked.
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*/
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#include "ansicon.h"
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static PIMAGE_DOS_HEADER pDosHeader;
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#define MakeVA( cast, offset ) (cast)((DWORD_PTR)pDosHeader + (DWORD)(offset))
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static int export_cmp( const void* a, const void* b )
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{
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return strcmp( (LPCSTR)a, MakeVA( LPCSTR, *(const PDWORD)b ) );
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}
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DWORD get_LLW32r( void )
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{
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HMODULE kernel32;
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TCHAR buf[MAX_PATH];
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UINT len;
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PIMAGE_NT_HEADERS32 pNTHeader;
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PIMAGE_EXPORT_DIRECTORY pExportDir;
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PDWORD fun_table, name_table;
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PWORD ord_table;
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PDWORD pLLW;
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DWORD LLWr;
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#ifdef _WIN64
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len = GetSystemWow64Directory( buf, MAX_PATH );
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#else
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len = GetSystemDirectory( buf, MAX_PATH );
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#endif
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wcscpy( buf + len, L"\\kernel32.dll" );
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kernel32 = LoadLibraryEx( buf, NULL, LOAD_LIBRARY_AS_IMAGE_RESOURCE );
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if (kernel32 == NULL)
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{
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DEBUGSTR( 1, L"Unable to load 32-bit kernel32.dll!" );
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return 0;
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}
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// The handle uses low bits as flags, so strip 'em off.
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pDosHeader = (PIMAGE_DOS_HEADER)((DWORD_PTR)kernel32 & ~0xFFFF);
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pNTHeader = MakeVA( PIMAGE_NT_HEADERS32, pDosHeader->e_lfanew );
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pExportDir = MakeVA( PIMAGE_EXPORT_DIRECTORY,
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pNTHeader->EXPORTDIR.VirtualAddress );
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fun_table = MakeVA( PDWORD, pExportDir->AddressOfFunctions );
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name_table = MakeVA( PDWORD, pExportDir->AddressOfNames );
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ord_table = MakeVA( PWORD, pExportDir->AddressOfNameOrdinals );
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pLLW = bsearch( "LoadLibraryW", name_table, pExportDir->NumberOfNames,
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sizeof(DWORD), export_cmp );
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if (pLLW == NULL)
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{
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DEBUGSTR( 1, L"Could not find 32-bit LoadLibraryW!" );
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LLWr = 0;
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}
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else
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{
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LLWr = fun_table[ord_table[pLLW - name_table]];
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}
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FreeLibrary( kernel32 );
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return LLWr;
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}
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#ifdef _WIN64
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DWORD64 get_LLW64r( void )
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{
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HMODULE kernel32;
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TCHAR buf[MAX_PATH];
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UINT len;
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PIMAGE_NT_HEADERS pNTHeader;
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PIMAGE_EXPORT_DIRECTORY pExportDir;
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PDWORD fun_table, name_table;
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PWORD ord_table;
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PDWORD pLLW;
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DWORD64 LLWr;
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len = GetSystemDirectory( buf, MAX_PATH );
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wcscpy( buf + len, L"\\kernel32.dll" );
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kernel32 = LoadLibraryEx( buf, NULL, LOAD_LIBRARY_AS_IMAGE_RESOURCE );
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if (kernel32 == NULL)
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{
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DEBUGSTR( 1, L"Unable to load 64-bit kernel32.dll!" );
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return 0;
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}
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// The handle uses low bits as flags, so strip 'em off.
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pDosHeader = (PIMAGE_DOS_HEADER)((DWORD_PTR)kernel32 & ~0xFFFF);
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pNTHeader = MakeVA( PIMAGE_NT_HEADERS, pDosHeader->e_lfanew );
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pExportDir = MakeVA( PIMAGE_EXPORT_DIRECTORY,
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pNTHeader->EXPORTDIR.VirtualAddress );
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fun_table = MakeVA( PDWORD, pExportDir->AddressOfFunctions );
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name_table = MakeVA( PDWORD, pExportDir->AddressOfNames );
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ord_table = MakeVA( PWORD, pExportDir->AddressOfNameOrdinals );
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pLLW = bsearch( "LoadLibraryW", name_table, pExportDir->NumberOfNames,
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sizeof(DWORD), export_cmp );
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if (pLLW == NULL)
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{
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DEBUGSTR( 1, L"Could not find 64-bit LoadLibraryW!" );
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LLWr = 0;
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}
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else
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{
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LLWr = fun_table[ord_table[pLLW - name_table]];
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}
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FreeLibrary( kernel32 );
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return LLWr;
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}
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#endif
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