faluco@1557: /**
faluco@1557:  * vim: set ts=4 :
faluco@1557:  * =============================================================================
faluco@1557:  * SourceMod
faluco@1557:  * Copyright (C) 2004-2007 AlliedModders LLC.  All rights reserved.
faluco@1557:  * =============================================================================
faluco@1557:  *
faluco@1557:  * This program is free software; you can redistribute it and/or modify it under
faluco@1557:  * the terms of the GNU General Public License, version 3.0, as published by the
faluco@1557:  * Free Software Foundation.
faluco@1557:  * 
faluco@1557:  * This program is distributed in the hope that it will be useful, but WITHOUT
faluco@1557:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
faluco@1557:  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
faluco@1557:  * details.
faluco@1557:  *
faluco@1557:  * You should have received a copy of the GNU General Public License along with
faluco@1557:  * this program.  If not, see <http://www.gnu.org/licenses/>.
faluco@1557:  *
faluco@1557:  * As a special exception, AlliedModders LLC gives you permission to link the
faluco@1557:  * code of this program (as well as its derivative works) to "Half-Life 2," the
faluco@1557:  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
faluco@1557:  * by the Valve Corporation.  You must obey the GNU General Public License in
faluco@1557:  * all respects for all other code used.  Additionally, AlliedModders LLC grants
faluco@1557:  * this exception to all derivative works.  AlliedModders LLC defines further
faluco@1557:  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
faluco@1557:  * or <http://www.sourcemod.net/license.php>.
faluco@1557:  *
faluco@1557:  * Version: $Id$
faluco@1557:  */
faluco@1557: 
faluco@1557: #include <ISmmPluginExt.h>
faluco@1557: #include <stdarg.h>
faluco@1557: #include <string.h>
faluco@1557: #include <stdio.h>
faluco@1557: 
faluco@1557: #if defined _MSC_VER
faluco@1557: 	#define DLL_EXPORT				extern "C" __declspec(dllexport)
faluco@1557: 	#define openlib(lib)			LoadLibrary(lib)
faluco@1557: 	#define closelib(lib)			FreeLibrary(lib)
faluco@1557: 	#define findsym(lib, sym)		GetProcAddress(lib, sym)
faluco@1557: 	#define PLATFORM_EXT			".dll"
faluco@1557: 	#define vsnprintf				_vsnprintf
faluco@1557: 	#define PATH_SEP_CHAR			"\\"
faluco@1557: 	inline bool IsPathSepChar(char c) 
faluco@1557: 	{
faluco@1557: 		return (c == '/' || c == '\\');
faluco@1557: 	}
faluco@1557: 	#include <Windows.h>
faluco@1557: #else
faluco@1557: 	#define DLL_EXPORT				extern "C" __attribute__((visibility("default")))
faluco@1557: 	#define openlib(lib)			dlopen(lib, RTLD_NOW)
faluco@1557: 	#define closelib(lib)			dlclose(lib)
faluco@1557: 	#define findsym(lib, sym)		dlsym(lib, sym)
faluco@1557: 	#define PLATFORM_EXT			".so"
faluco@1557: 	typedef void *					HINSTANCE;
faluco@1557: 	#define PATH_SEP_CHAR			"/"
faluco@1557: 	inline bool IsPathSepChar(char c) 
faluco@1557: 	{
faluco@1557: 		return (c == '/');
faluco@1557: 	}
faluco@1557: 	#include <dlfcn.h>
faluco@1557: #endif
faluco@1557: 
faluco@1557: #define METAMOD_API_MAJOR			2
faluco@1557: #define FILENAME_1_4_EP1			"sourcemod.1.ep1" PLATFORM_EXT
faluco@1557: #define FILENAME_1_6_EP2			"sourcemod.2.ep2" PLATFORM_EXT
faluco@1557: #define FILENAME_1_6_EP1			"sourcemod.2.ep1" PLATFORM_EXT
faluco@1557: 
faluco@1557: HINSTANCE g_hCore = NULL;
dvander@1561: bool load_attempted = false;
faluco@1557: 
faluco@1557: size_t UTIL_Format(char *buffer, size_t maxlength, const char *fmt, ...)
faluco@1557: {
faluco@1557: 	va_list ap;
faluco@1557: 
faluco@1557: 	va_start(ap, fmt);
faluco@1557: 	size_t len = vsnprintf(buffer, maxlength, fmt, ap);
faluco@1557: 	va_end(ap);
faluco@1557: 
faluco@1557: 	if (len >= maxlength)
faluco@1557: 	{
faluco@1557: 		len = maxlength - 1;
faluco@1557: 		buffer[len] = '\0';
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	return len;
faluco@1557: }
faluco@1557: 
faluco@1557: METAMOD_PLUGIN *_GetPluginPtr(const char *path)
faluco@1557: {
faluco@1557: 	METAMOD_FN_ORIG_LOAD fn;
faluco@1557: 	METAMOD_PLUGIN *pl;
faluco@1557: 	int ret;
faluco@1557: 
faluco@1557: 	if (!(g_hCore=openlib(path)))
faluco@1557: 	{
faluco@1557: 		return NULL;
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	if (!(fn=(METAMOD_FN_ORIG_LOAD)findsym(g_hCore, "CreateInterface")))
faluco@1557: 	{
faluco@1557: 		goto error;
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	pl = (METAMOD_PLUGIN *)fn(METAMOD_PLAPI_NAME, &ret);
faluco@1557: 	if (!pl)
faluco@1557: 	{
faluco@1557: 		goto error;
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	return pl;
faluco@1557: error:
faluco@1557: 	closelib(g_hCore);
faluco@1557: 	g_hCore = NULL;
faluco@1557: 	return NULL;
faluco@1557: }
faluco@1557: 
faluco@1557: bool GetFileOfAddress(void *pAddr, char *buffer, size_t maxlength)
faluco@1557: {
faluco@1557: #if defined _MSC_VER
faluco@1557: 	MEMORY_BASIC_INFORMATION mem;
faluco@1557: 	if (!VirtualQuery(pAddr, &mem, sizeof(mem)))
faluco@1557: 		return false;
faluco@1557: 	if (mem.AllocationBase == NULL)
faluco@1557: 		return false;
faluco@1557: 	HMODULE dll = (HMODULE)mem.AllocationBase;
faluco@1557: 	GetModuleFileName(dll, (LPTSTR)buffer, maxlength);
faluco@1557: #else
faluco@1557: 	Dl_info info;
faluco@1557: 	if (!dladdr(pAddr, &info))
faluco@1557: 		return false;
faluco@1557: 	if (!info.dli_fbase || !info.dli_fname)
faluco@1557: 		return false;
faluco@1557: 	const char *dllpath = info.dli_fname;
faluco@1557: 	snprintf(buffer, maxlength, "%s", dllpath);
faluco@1557: #endif
faluco@1557: 	return true;
faluco@1557: }
faluco@1557: 
faluco@1557: DLL_EXPORT METAMOD_PLUGIN *CreateInterface_MMS(const MetamodVersionInfo *mvi, const MetamodLoaderInfo *mli)
faluco@1557: {
faluco@1557: 	char *filename;
dvander@1561: 
dvander@1561: 	load_attempted = true;
faluco@1557: 	
faluco@1557: 	if (mvi->api_major > METAMOD_API_MAJOR)
faluco@1557: 	{
faluco@1557: 		return NULL;
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	switch (mvi->source_engine)
faluco@1557: 	{
faluco@1557: 	case SOURCE_ENGINE_ORANGEBOX:
faluco@1557: 		{
faluco@1557: 			filename = FILENAME_1_6_EP2;
faluco@1557: 			break;
faluco@1557: 		}
faluco@1557: 	case SOURCE_ENGINE_EPISODEONE:
faluco@1557: 	case SOURCE_ENGINE_ORIGINAL:
faluco@1557: 		{
faluco@1557: 			filename = FILENAME_1_6_EP1;
faluco@1557: 			break;
faluco@1557: 		}
faluco@1557: 	default:
faluco@1557: 		{
faluco@1557: 			return NULL;
faluco@1557: 		}
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	char abspath[256];
faluco@1557: 	UTIL_Format(abspath, sizeof(abspath), "%s" PATH_SEP_CHAR "%s", mli->pl_path, filename);
faluco@1557: 
faluco@1557: 	return _GetPluginPtr(abspath);
faluco@1557: }
faluco@1557: 
faluco@1557: DLL_EXPORT void UnloadInterface_MMS()
faluco@1557: {
faluco@1557: 	if (g_hCore)
faluco@1557: 	{
faluco@1557: 		closelib(g_hCore);
faluco@1557: 		g_hCore = NULL;
faluco@1557: 	}
faluco@1557: }
faluco@1557: 
faluco@1557: DLL_EXPORT void *CreateInterface(const char *iface, int *ret)
faluco@1557: {
dvander@1561: 	/**
dvander@1561: 	 * If a load has already been attempted, bail out immediately.
dvander@1561: 	 */
dvander@1561: 	if (load_attempted)
dvander@1561: 	{
dvander@1561: 		return NULL;
dvander@1561: 	}
dvander@1561: 
dvander@1561: 	if (strcmp(iface, METAMOD_PLAPI_NAME) == 0)
faluco@1557: 	{
faluco@1557: 		char thisfile[256];
faluco@1557: 		char targetfile[256];
faluco@1557: 
faluco@1557: 		if (!GetFileOfAddress((void *)CreateInterface_MMS, thisfile, sizeof(thisfile)))
faluco@1557: 		{
faluco@1557: 			return NULL;
faluco@1557: 		}
faluco@1557: 
faluco@1557: 		size_t len = strlen(thisfile);
faluco@1557: 		for (size_t iter=len-1; iter>=0 && iter<len; iter--)
faluco@1557: 		{
faluco@1557: 			if (IsPathSepChar(thisfile[iter]))
faluco@1557: 			{
faluco@1557: 				thisfile[iter] = '\0';
faluco@1557: 				break;
faluco@1557: 			}
faluco@1557: 		}
faluco@1557: 
faluco@1557: 		UTIL_Format(targetfile, sizeof(targetfile), "%s" PATH_SEP_CHAR FILENAME_1_4_EP1, thisfile);
faluco@1557: 
faluco@1557: 		return _GetPluginPtr(targetfile);
faluco@1557: 	}
faluco@1557: 
faluco@1557: 	return NULL;
faluco@1557: }
faluco@1557: 
faluco@1557: #if defined _MSC_VER
faluco@1557: BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved)
faluco@1557: {
faluco@1557: 	if (fdwReason == DLL_PROCESS_DETACH)
faluco@1557: 	{
faluco@1557: 		UnloadInterface_MMS();
faluco@1557: 	}
faluco@1557: 	return TRUE;
faluco@1557: }
faluco@1557: #else
faluco@1557: __attribute__((destructor)) static void gcc_fini()
faluco@1557: {
faluco@1557: 	UnloadInterface_MMS();
faluco@1557: }
faluco@1557: #endif