/**

 * vim: set ts=4 :

 * ===============================================================

 * SourceMod (C)2004-2007 AlliedModders LLC.  All rights reserved.

 * ===============================================================

 *

 * This file is not open source and may not be copied without explicit

 * written permission of AlliedModders LLC.  This file may not be redistributed 

 * in whole or significant part.

 * For information, see LICENSE.txt or http://www.sourcemod.net/license.php

 *

 * Version: $Id$

 */

#if defined CRAZY_DEBUG

#include "sm_globals.h"

#include "sourcemm_api.h"

#include "Tlhelp32.h"

#include "LibrarySys.h"

#include "minidump.h"

BOOL

WINAPI

MiniDumpWriteDump2(

				  IN HANDLE hProcess,

				  IN DWORD ProcessId,

				  IN HANDLE hFile,

				  IN MINIDUMP_TYPE DumpType,

				  IN CONST PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam, OPTIONAL

				  IN CONST PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam, OPTIONAL

				  IN CONST PMINIDUMP_CALLBACK_INFORMATION CallbackParam OPTIONAL

				  )

{

	DumpType = (MINIDUMP_TYPE)((int)DumpType|MiniDumpWithFullMemory|MiniDumpWithHandleData);

	return MiniDumpWriteDump(hProcess, ProcessId, hFile, DumpType, ExceptionParam, UserStreamParam, CallbackParam);

}

FARPROC WINAPI GetProcAddress2(HMODULE hModule, LPCSTR lpProcName)

{

	if (strcmp(lpProcName, "MiniDumpWriteDump") == 0)

	{

		return (FARPROC)MiniDumpWriteDump2;

	}

	return GetProcAddress(hModule, lpProcName);

}

class CrazyWindowsDebugger : public SMGlobalClass

{

public:

	void OnSourceModAllInitialized()

	{

		HANDLE hModuleList = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId());

		MODULEENTRY32 me32;

		me32.dwSize = sizeof(MODULEENTRY32);

		if (!Module32First(hModuleList, &me32))

		{

			Error("Could not initialize crazy debugger!");

		}

		bool found = false;

		do

		{

			if (strcasecmp(me32.szModule, "steam.dll") == 0)

			{

				IMAGE_DOS_HEADER *dos = (IMAGE_DOS_HEADER *)me32.modBaseAddr;

				if (dos->e_magic != IMAGE_DOS_SIGNATURE)

				{

					Error("[SM] Could not detect steam.dll with valid DOS signature");

				}

				char *base = (char *)dos;

				IMAGE_NT_HEADERS *nt = (IMAGE_NT_HEADERS *)(base + dos->e_lfanew);

				if (nt->Signature != IMAGE_NT_SIGNATURE)

				{

					Error("[SM] Could not detect steam.dll with valid NT signature");

				}

				IMAGE_IMPORT_DESCRIPTOR *desc = 

					(IMAGE_IMPORT_DESCRIPTOR *)

					(base + nt->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);

				if (base == (char *)desc)

				{

					Error("[SM] Could not find the steam.dll IAT");

				}

				while (desc->Name)

				{

					if (desc->FirstThunk != 0)

					{

						IMAGE_THUNK_DATA *data = (IMAGE_THUNK_DATA *)(base + desc->OriginalFirstThunk);

						DWORD *iat = (DWORD *)(base + desc->FirstThunk);

						while (data->u1.Function)

						{

							if ((data->u1.Ordinal & IMAGE_ORDINAL_FLAG32) != IMAGE_ORDINAL_FLAG32)

							{

								IMAGE_IMPORT_BY_NAME *import = (IMAGE_IMPORT_BY_NAME *)(base + data->u1.AddressOfData);

								if (strcmp((char *)import->Name, "GetProcAddress") == 0)

								{

									DWORD oldprot, oldprot2;

									VirtualProtect(iat, 4, PAGE_READWRITE, &oldprot);

									*iat = (DWORD)GetProcAddress2;

									VirtualProtect(iat, 4, oldprot, &oldprot2);

									found = true;

									goto _end;

								}

							}

							data++;

							iat++;

						}

					}

					desc++;

				}

				break;

			}

		} while  (Module32Next(hModuleList, &me32));

_end:

		if (!found)

		{

			Error("Could not find steam.dll's GetProcAddress IAT entry");

		}

		CloseHandle(hModuleList);

	}

} s_CrazyDebugger;

#endif