ds@1952: /**
ds@1952:  * vim: set ts=4 :
ds@1952:  * =============================================================================
ds@1952:  * SourceMod
ds@1952:  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
ds@1952:  * =============================================================================
ds@1952:  *
ds@1952:  * This program is free software; you can redistribute it and/or modify it under
ds@1952:  * the terms of the GNU General Public License, version 3.0, as published by the
ds@1952:  * Free Software Foundation.
ds@1952:  * 
ds@1952:  * This program is distributed in the hope that it will be useful, but WITHOUT
ds@1952:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
ds@1952:  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
ds@1952:  * details.
ds@1952:  *
ds@1952:  * You should have received a copy of the GNU General Public License along with
ds@1952:  * this program.  If not, see <http://www.gnu.org/licenses/>.
ds@1952:  *
ds@1952:  * As a special exception, AlliedModders LLC gives you permission to link the
ds@1952:  * code of this program (as well as its derivative works) to "Half-Life 2," the
ds@1952:  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
ds@1952:  * by the Valve Corporation.  You must obey the GNU General Public License in
ds@1952:  * all respects for all other code used.  Additionally, AlliedModders LLC grants
ds@1952:  * this exception to all derivative works.  AlliedModders LLC defines further
ds@1952:  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
ds@1952:  * or <http://www.sourcemod.net/license.php>.
ds@1952:  *
ds@1952:  * Version: $Id$
ds@1952:  */
ds@1952: 
ds@1952: #include "sm_globals.h"
ds@1952: #include "sourcemm_api.h"
ds@1952: #include "Tlhelp32.h"
ds@1952: #include "LibrarySys.h"
ds@1952: #include "minidump.h"
ds@2040: #include "sm_stringutil.h"
ds@2040: 
ds@2040: bool HookImportAddrTable(BYTE *base, const char *func, DWORD hookfunc, char *err, size_t maxlength)
ds@2040: {
ds@2040: 	IMAGE_DOS_HEADER *dos = (IMAGE_DOS_HEADER *)base;
ds@2040: 	if (dos->e_magic != IMAGE_DOS_SIGNATURE)
ds@2040: 	{
ds@2040: 		UTIL_Format(err, maxlength, "%s", "Could not detect valid DOS signature");
ds@2041: 		return false;
ds@2040: 	}
ds@2040: 
ds@2040: 	IMAGE_NT_HEADERS *nt = (IMAGE_NT_HEADERS *)(base + dos->e_lfanew);
ds@2040: 	if (nt->Signature != IMAGE_NT_SIGNATURE)
ds@2040: 	{
ds@2040: 		UTIL_Format(err, maxlength, "%s", "Could not detect valid NT signature");
ds@2040: 		return false;
ds@2040: 	}
ds@2040: 
ds@2040: 	IMAGE_IMPORT_DESCRIPTOR *desc = 
ds@2040: 		(IMAGE_IMPORT_DESCRIPTOR *)
ds@2040: 		(base + nt->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
ds@2040: 	if (base == (BYTE *)desc)
ds@2040: 	{
ds@2040: 		UTIL_Format(err, maxlength, "%s", "Could not find IAT");
ds@2040: 		return false;
ds@2040: 	}
ds@2040: 
ds@2040: 	bool entryFound = false;
ds@2040: 	while (desc->Name)
ds@2040: 	{
ds@2040: 		if (desc->FirstThunk != 0)
ds@2040: 		{
ds@2040: 			IMAGE_THUNK_DATA *data = (IMAGE_THUNK_DATA *)(base + desc->OriginalFirstThunk);
ds@2040: 			DWORD *iat = (DWORD *)(base + desc->FirstThunk);
ds@2040: 			while (data->u1.Function)
ds@2040: 			{
ds@2040: 				if ((data->u1.Ordinal & IMAGE_ORDINAL_FLAG32) != IMAGE_ORDINAL_FLAG32)
ds@2040: 				{
ds@2040: 					IMAGE_IMPORT_BY_NAME *import = (IMAGE_IMPORT_BY_NAME *)(base + data->u1.AddressOfData);
ds@2040: 					if (strcmp((char *)import->Name, func) == 0)
ds@2040: 					{
ds@2040: 						DWORD oldprot, oldprot2;
ds@2040: 						VirtualProtect(iat, 4, PAGE_READWRITE, &oldprot);
ds@2040: 						*iat = hookfunc;
ds@2040: 						VirtualProtect(iat, 4, oldprot, &oldprot2);
ds@2040: 						entryFound = true;
ds@2040: 					}
ds@2040: 				}
ds@2040: 				data++;
ds@2040: 				iat++;
ds@2040: 			}
ds@2040: 		}
ds@2040: 		desc++;
ds@2040: 	}
ds@2040: 
ds@2040: 	if (!entryFound)
ds@2040: 	{
ds@2040: 		UTIL_Format(err, maxlength, "Could not find IAT entry for %s", func);
ds@2040: 		return false;
ds@2040: 	}
ds@2040: 
ds@2040: 	return true;
ds@2040: }
ds@1952: 
ds@1952: BOOL
ds@1952: WINAPI
ds@1952: MiniDumpWriteDump2(
ds@1952: 				  IN HANDLE hProcess,
ds@1952: 				  IN DWORD ProcessId,
ds@1952: 				  IN HANDLE hFile,
ds@1952: 				  IN MINIDUMP_TYPE DumpType,
ds@1952: 				  IN CONST PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam, OPTIONAL
ds@1952: 				  IN CONST PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam, OPTIONAL
ds@1952: 				  IN CONST PMINIDUMP_CALLBACK_INFORMATION CallbackParam OPTIONAL
ds@1952: 				  )
ds@1952: {
ds@1952: 	DumpType = (MINIDUMP_TYPE)((int)DumpType|MiniDumpWithFullMemory|MiniDumpWithHandleData);
ds@1952: 	return MiniDumpWriteDump(hProcess, ProcessId, hFile, DumpType, ExceptionParam, UserStreamParam, CallbackParam);
ds@1952: }
ds@1952: 
ds@1952: FARPROC WINAPI GetProcAddress2(HMODULE hModule, LPCSTR lpProcName)
ds@1952: {
ds@1952: 	if (strcmp(lpProcName, "MiniDumpWriteDump") == 0)
ds@1952: 	{
ds@1952: 		return (FARPROC)MiniDumpWriteDump2;
ds@1952: 	}
ds@1952: 
ds@1952: 	return GetProcAddress(hModule, lpProcName);
ds@1952: }
ds@1952: 
ds@2040: HMODULE WINAPI LoadLibraryEx2(LPCTSTR lpFileName, HANDLE hFile, DWORD dwFlags)
ds@2040: {
ds@2040: 	HMODULE lib = LoadLibraryEx(lpFileName, hFile, dwFlags);
ds@2040: 
ds@2040: 	/* Steam.dll seems to get loaded using an abs path, thus the use of stristr() */
ds@2040: 	if (stristr(lpFileName, "steam.dll"))
ds@2040: 	{
ds@2040: 		char err[64];
ds@2040: 		if (!HookImportAddrTable((BYTE *)lib, "GetProcAddress", (DWORD)GetProcAddress2, err, sizeof(err)))
ds@2040: 		{
ds@2040: 			Error("[SM] %s in steam.dll\n", err);
ds@2040: 			return NULL;
ds@2040: 		}
ds@2040: 	}
ds@2040: 
ds@2040: 	return lib;
ds@2040: }
ds@2040: 
ds@1952: class CrazyWindowsDebugger : public SMGlobalClass
ds@1952: {
ds@1952: public:
ds@1952: 	void OnSourceModAllInitialized()
ds@1952: 	{
ds@1952: 		HANDLE hModuleList = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId());
ds@1952: 		MODULEENTRY32 me32;
ds@2040: 		BYTE *engine = NULL;
ds@2040: 		BYTE *steam = NULL;
ds@2040: 		char err[64];
ds@1952: 
ds@1952: 		me32.dwSize = sizeof(MODULEENTRY32);
ds@1952: 
ds@1952: 		if (!Module32First(hModuleList, &me32))
ds@1952: 		{
ds@1952: 			Error("Could not initialize crazy debugger!");
ds@1952: 		}
ds@1952: 
ds@1952: 		do
ds@1952: 		{
ds@2040: 			if (strcasecmp(me32.szModule, "engine.dll") == 0)
ds@1952: 			{
ds@2040: 				engine = me32.modBaseAddr;
ds@2040: 			}
ds@2040: 			else if (strcasecmp(me32.szModule, "steam.dll") == 0)
ds@2040: 			{
ds@2040: 				steam = me32.modBaseAddr;
ds@1952: 			}
ds@1952: 		} while  (Module32Next(hModuleList, &me32));
ds@1952: 
ds@2040: 		CloseHandle(hModuleList);
ds@1952: 
ds@2040: 		/* This really should not happen, but ... */
ds@2040: 		if (!engine)
ds@1952: 		{
ds@2040: 			Error("[SM] Could not find engine.dll\n");
ds@1952: 		}
ds@1952: 
ds@2040: 		/* Steam.dll isn't loaded yet */
ds@2040: 		if (!steam)
ds@2040: 		{
ds@2040: 			if (!HookImportAddrTable(engine, "LoadLibraryExA", (DWORD)LoadLibraryEx2, err, sizeof(err)))
ds@2040: 			{
ds@2040: 				Error("[SM] %s in engine.dll)\n", err);
ds@2040: 			}
ds@2040: 		}
ds@2040: 		else
ds@2040: 		{
ds@2040: 			if (!HookImportAddrTable(steam, "GetProcAddress", (DWORD)GetProcAddress2, err, sizeof(err)))
ds@2040: 			{
ds@2040: 				Error("[SM] %s in steam.dll)\n", err);
ds@2040: 			}
ds@2040: 		}
ds@1952: 	}
ds@1952: } s_CrazyDebugger;