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96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
// This file contains code from
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// https://github.com/stevemk14ebr/PolyHook_2_0/blob/master/sources/IatHook.cpp
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// which is licensed under the MIT License.
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// See PolyHook_2_0-LICENSE for more information.
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#pragma once
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#include "Common/CommonWindows.h"
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#include <cstdint>
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#include <winnt.h>
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template <typename T, typename T1, typename T2>
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constexpr T RVA2VA(T1 base, T2 rva)
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{
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return reinterpret_cast<T>(reinterpret_cast<ULONG_PTR>(base) + rva);
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}
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template <typename T>
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constexpr T DataDirectoryFromModuleBase(void *moduleBase, size_t entryID)
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{
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auto dosHdr = reinterpret_cast<PIMAGE_DOS_HEADER>(moduleBase);
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auto ntHdr = RVA2VA<PIMAGE_NT_HEADERS>(moduleBase, dosHdr->e_lfanew);
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auto dataDir = ntHdr->OptionalHeader.DataDirectory;
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return RVA2VA<T>(moduleBase, dataDir[entryID].VirtualAddress);
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}
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inline PIMAGE_THUNK_DATA FindAddressByName(void *moduleBase, PIMAGE_THUNK_DATA impName, PIMAGE_THUNK_DATA impAddr, const char *funcName)
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{
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for (; impName->u1.Ordinal; ++impName, ++impAddr)
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{
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if (IMAGE_SNAP_BY_ORDINAL(impName->u1.Ordinal))
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continue;
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auto import = RVA2VA<PIMAGE_IMPORT_BY_NAME>(moduleBase, impName->u1.AddressOfData);
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if (strcmp(import->Name, funcName) != 0)
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continue;
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return impAddr;
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}
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return nullptr;
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}
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inline PIMAGE_THUNK_DATA FindAddressByOrdinal(void *moduleBase, PIMAGE_THUNK_DATA impName, PIMAGE_THUNK_DATA impAddr, uint16_t ordinal)
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{
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for (; impName->u1.Ordinal; ++impName, ++impAddr)
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{
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if (IMAGE_SNAP_BY_ORDINAL(impName->u1.Ordinal) && IMAGE_ORDINAL(impName->u1.Ordinal) == ordinal)
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return impAddr;
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}
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return nullptr;
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}
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inline PIMAGE_THUNK_DATA FindIatThunkInModule(void *moduleBase, const char *dllName, const char *funcName)
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{
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auto imports = DataDirectoryFromModuleBase<PIMAGE_IMPORT_DESCRIPTOR>(moduleBase, IMAGE_DIRECTORY_ENTRY_IMPORT);
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for (; imports->Name; ++imports)
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{
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if (_stricmp(RVA2VA<LPCSTR>(moduleBase, imports->Name), dllName) != 0)
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continue;
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auto origThunk = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->OriginalFirstThunk);
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auto thunk = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->FirstThunk);
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return FindAddressByName(moduleBase, origThunk, thunk, funcName);
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}
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return nullptr;
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}
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inline PIMAGE_THUNK_DATA FindDelayLoadThunkInModule(void *moduleBase, const char *dllName, const char *funcName)
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{
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auto imports = DataDirectoryFromModuleBase<PIMAGE_DELAYLOAD_DESCRIPTOR>(moduleBase, IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT);
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for (; imports->DllNameRVA; ++imports)
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{
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if (_stricmp(RVA2VA<LPCSTR>(moduleBase, imports->DllNameRVA), dllName) != 0)
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continue;
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auto impName = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->ImportNameTableRVA);
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auto impAddr = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->ImportAddressTableRVA);
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return FindAddressByName(moduleBase, impName, impAddr, funcName);
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}
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return nullptr;
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}
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inline PIMAGE_THUNK_DATA FindDelayLoadThunkInModule(void *moduleBase, const char *dllName, uint16_t ordinal)
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{
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auto imports = DataDirectoryFromModuleBase<PIMAGE_DELAYLOAD_DESCRIPTOR>(moduleBase, IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT);
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for (; imports->DllNameRVA; ++imports)
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{
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if (_stricmp(RVA2VA<LPCSTR>(moduleBase, imports->DllNameRVA), dllName) != 0)
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continue;
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auto impName = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->ImportNameTableRVA);
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auto impAddr = RVA2VA<PIMAGE_THUNK_DATA>(moduleBase, imports->ImportAddressTableRVA);
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return FindAddressByOrdinal(moduleBase, impName, impAddr, ordinal);
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}
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return nullptr;
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}
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