dvander@2168: /**
dvander@2168:  * vim: set ts=4 :
dvander@2168:  * =============================================================================
dvander@2168:  * SourceMod
dvander@2168:  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
dvander@2168:  * =============================================================================
dvander@2168:  *
dvander@2168:  * This program is free software; you can redistribute it and/or modify it under
dvander@2168:  * the terms of the GNU General Public License, version 3.0, as published by the
dvander@2168:  * Free Software Foundation.
dvander@2168:  * 
dvander@2168:  * This program is distributed in the hope that it will be useful, but WITHOUT
dvander@2168:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@2168:  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
dvander@2168:  * details.
dvander@2168:  *
dvander@2168:  * You should have received a copy of the GNU General Public License along with
dvander@2168:  * this program.  If not, see <http://www.gnu.org/licenses/>.
dvander@2168:  *
dvander@2168:  * As a special exception, AlliedModders LLC gives you permission to link the
dvander@2168:  * code of this program (as well as its derivative works) to "Half-Life 2," the
dvander@2168:  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
dvander@2168:  * by the Valve Corporation.  You must obey the GNU General Public License in
dvander@2168:  * all respects for all other code used.  Additionally, AlliedModders LLC grants
dvander@2168:  * this exception to all derivative works.  AlliedModders LLC defines further
dvander@2168:  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
dvander@2168:  * or <http://www.sourcemod.net/license.php>.
dvander@2168:  *
dvander@2168:  * Version: $Id$
dvander@2168:  */
dvander@2168: 
dvander@2168: #include <ISmmPluginExt.h>
dvander@2168: #include <stdarg.h>
dvander@2168: #include <string.h>
dvander@2168: #include <stdio.h>
dvander@2168: #include <malloc.h>
dvander@2168: 
dvander@2168: #if defined _MSC_VER
dvander@2168: 	#define DLL_EXPORT				extern "C" __declspec(dllexport)
dvander@2168: 	#define openlib(lib)			LoadLibrary(lib)
dvander@2168: 	#define closelib(lib)			FreeLibrary(lib)
dvander@2168: 	#define findsym(lib, sym)		GetProcAddress(lib, sym)
dvander@2168: 	#define PLATFORM_EXT			".dll"
dvander@2168: 	#define vsnprintf				_vsnprintf
dvander@2168: 	#define PATH_SEP_CHAR			"\\"
dvander@2168: 	inline bool IsPathSepChar(char c) 
dvander@2168: 	{
dvander@2168: 		return (c == '/' || c == '\\');
dvander@2168: 	}
dvander@2168: 	#include <Windows.h>
dvander@2168: #else
dvander@2168: 	#define DLL_EXPORT				extern "C" __attribute__((visibility("default")))
dvander@2168: 	#define openlib(lib)			dlopen(lib, RTLD_NOW)
dvander@2168: 	#define closelib(lib)			dlclose(lib)
dvander@2168: 	#define findsym(lib, sym)		dlsym(lib, sym)
dvander@2168: 	#define PLATFORM_EXT			".so"
dvander@2168: 	typedef void *					HINSTANCE;
dvander@2168: 	#define PATH_SEP_CHAR			"/"
dvander@2168: 	inline bool IsPathSepChar(char c) 
dvander@2168: 	{
dvander@2168: 		return (c == '/');
dvander@2168: 	}
dvander@2168: 	#include <dlfcn.h>
dvander@2168: #endif
dvander@2168: 
dvander@2168: #define METAMOD_API_MAJOR			2
dvander@2168: #define FILENAME_1_4_EP1			"sourcemod.1.ep1" PLATFORM_EXT
dvander@2168: #define FILENAME_1_6_EP2			"sourcemod.2.ep2" PLATFORM_EXT
dvander@2168: #define FILENAME_1_6_EP1			"sourcemod.2.ep1" PLATFORM_EXT
dvander@2168: 
dvander@2168: HINSTANCE g_hCore = NULL;
dvander@2168: bool load_attempted = false;
dvander@2168: 
dvander@2168: size_t UTIL_Format(char *buffer, size_t maxlength, const char *fmt, ...);
dvander@2168: 
dvander@2168: class FailPlugin : public SourceMM::ISmmFailPlugin
dvander@2168: {
dvander@2168: public:
dvander@2168: 	int GetApiVersion()
dvander@2168: 	{
dvander@2168: 		return fail_version;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	bool Load(SourceMM::PluginId id, SourceMM::ISmmAPI *ismm, char *error, size_t maxlength, bool late)
dvander@2168: 	{
dvander@2168: 		if (error != NULL && maxlength != 0)
dvander@2168: 		{
dvander@2168: 			UTIL_Format(error, maxlength, "%s", error_buffer);
dvander@2168: 		}
dvander@2168: 		return false;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	int fail_version;
dvander@2168: 	char error_buffer[512];
dvander@2168: } s_FailPlugin;
dvander@2168: 
dvander@2168: size_t UTIL_Format(char *buffer, size_t maxlength, const char *fmt, ...)
dvander@2168: {
dvander@2168: 	va_list ap;
dvander@2168: 
dvander@2168: 	va_start(ap, fmt);
dvander@2168: 	size_t len = vsnprintf(buffer, maxlength, fmt, ap);
dvander@2168: 	va_end(ap);
dvander@2168: 
dvander@2168: 	if (len >= maxlength)
dvander@2168: 	{
dvander@2168: 		len = maxlength - 1;
dvander@2168: 		buffer[len] = '\0';
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	return len;
dvander@2168: }
dvander@2168: 
dvander@2168: METAMOD_PLUGIN *_GetPluginPtr(const char *path, int fail_api)
dvander@2168: {
dvander@2168: 	METAMOD_FN_ORIG_LOAD fn;
dvander@2168: 	METAMOD_PLUGIN *pl;
dvander@2168: 	int ret;
dvander@2168: 
dvander@2168: 	if (!(g_hCore=openlib(path)))
dvander@2168: 	{
dvander@2168: #if defined __linux__
dvander@2168: 		UTIL_Format(s_FailPlugin.error_buffer, 
dvander@2168: 			sizeof(s_FailPlugin.error_buffer),
dvander@2168: 			"%s",
dvander@2168: 			dlerror());
dvander@2168: #else
dvander@2168: 		DWORD err = GetLastError();
dvander@2168: 
dvander@2168: 		if (FormatMessageA(
dvander@2168: 				FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
dvander@2168: 				NULL,
dvander@2168: 				err,
dvander@2168: 				MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
dvander@2168: 				s_FailPlugin.error_buffer,
dvander@2168: 				sizeof(s_FailPlugin.error_buffer),
dvander@2168: 				NULL)
dvander@2168: 			== 0)
dvander@2168: 		{
dvander@2168: 			UTIL_Format(s_FailPlugin.error_buffer, 
dvander@2168: 				sizeof(s_FailPlugin.error_buffer),
dvander@2168: 				"unknown error %x",
dvander@2168: 				err);
dvander@2168: 		}
dvander@2168: #endif
dvander@2168: 
dvander@2168: 		s_FailPlugin.fail_version = fail_api;
dvander@2168: 
dvander@2168: 		return (METAMOD_PLUGIN *)&s_FailPlugin;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	if (!(fn=(METAMOD_FN_ORIG_LOAD)findsym(g_hCore, "CreateInterface")))
dvander@2168: 	{
dvander@2168: 		goto error;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	pl = (METAMOD_PLUGIN *)fn(METAMOD_PLAPI_NAME, &ret);
dvander@2168: 	if (!pl)
dvander@2168: 	{
dvander@2168: 		goto error;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	return pl;
dvander@2168: error:
dvander@2168: 	closelib(g_hCore);
dvander@2168: 	g_hCore = NULL;
dvander@2168: 	return NULL;
dvander@2168: }
dvander@2168: 
dvander@2168: bool GetFileOfAddress(void *pAddr, char *buffer, size_t maxlength)
dvander@2168: {
dvander@2168: #if defined _MSC_VER
dvander@2168: 	MEMORY_BASIC_INFORMATION mem;
dvander@2168: 	if (!VirtualQuery(pAddr, &mem, sizeof(mem)))
dvander@2168: 		return false;
dvander@2168: 	if (mem.AllocationBase == NULL)
dvander@2168: 		return false;
dvander@2168: 	HMODULE dll = (HMODULE)mem.AllocationBase;
dvander@2168: 	GetModuleFileName(dll, (LPTSTR)buffer, maxlength);
dvander@2168: #else
dvander@2168: 	Dl_info info;
dvander@2168: 	if (!dladdr(pAddr, &info))
dvander@2168: 		return false;
dvander@2168: 	if (!info.dli_fbase || !info.dli_fname)
dvander@2168: 		return false;
dvander@2168: 	const char *dllpath = info.dli_fname;
dvander@2168: 	snprintf(buffer, maxlength, "%s", dllpath);
dvander@2168: #endif
dvander@2168: 	return true;
dvander@2168: }
dvander@2168: 
dvander@2168: DLL_EXPORT METAMOD_PLUGIN *CreateInterface_MMS(const MetamodVersionInfo *mvi, const MetamodLoaderInfo *mli)
dvander@2168: {
dvander@2168: 	char *filename;
dvander@2168: 
dvander@2168: 	load_attempted = true;
dvander@2168: 	
dvander@2168: 	if (mvi->api_major > METAMOD_API_MAJOR)
dvander@2168: 	{
dvander@2168: 		return NULL;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	switch (mvi->source_engine)
dvander@2168: 	{
dvander@2168: 	case SOURCE_ENGINE_ORANGEBOX:
dvander@2168: 		{
dvander@2168: 			filename = FILENAME_1_6_EP2;
dvander@2168: 			break;
dvander@2168: 		}
dvander@2168: 	case SOURCE_ENGINE_EPISODEONE:
dvander@2168: 	case SOURCE_ENGINE_ORIGINAL:
dvander@2168: 		{
dvander@2168: 			filename = FILENAME_1_6_EP1;
dvander@2168: 			break;
dvander@2168: 		}
dvander@2168: 	default:
dvander@2168: 		{
dvander@2168: 			return NULL;
dvander@2168: 		}
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	char abspath[256];
dvander@2168: 	UTIL_Format(abspath, sizeof(abspath), "%s" PATH_SEP_CHAR "%s", mli->pl_path, filename);
dvander@2168: 
dvander@2168: 	return _GetPluginPtr(abspath, METAMOD_FAIL_API_V2);
dvander@2168: }
dvander@2168: 
dvander@2168: DLL_EXPORT void UnloadInterface_MMS()
dvander@2168: {
dvander@2168: 	if (g_hCore)
dvander@2168: 	{
dvander@2168: 		closelib(g_hCore);
dvander@2168: 		g_hCore = NULL;
dvander@2168: 	}
dvander@2168: }
dvander@2168: 
dvander@2168: DLL_EXPORT void *CreateInterface(const char *iface, int *ret)
dvander@2168: {
dvander@2168: 	/**
dvander@2168: 	 * If a load has already been attempted, bail out immediately.
dvander@2168: 	 */
dvander@2168: 	if (load_attempted)
dvander@2168: 	{
dvander@2168: 		return NULL;
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	if (strcmp(iface, METAMOD_PLAPI_NAME) == 0)
dvander@2168: 	{
dvander@2168: 		char thisfile[256];
dvander@2168: 		char targetfile[256];
dvander@2168: 
dvander@2168: 		if (!GetFileOfAddress((void *)CreateInterface_MMS, thisfile, sizeof(thisfile)))
dvander@2168: 		{
dvander@2168: 			return NULL;
dvander@2168: 		}
dvander@2168: 
dvander@2168: 		size_t len = strlen(thisfile);
dvander@2168: 		for (size_t iter=len-1; iter>=0 && iter<len; iter--)
dvander@2168: 		{
dvander@2168: 			if (IsPathSepChar(thisfile[iter]))
dvander@2168: 			{
dvander@2168: 				thisfile[iter] = '\0';
dvander@2168: 				break;
dvander@2168: 			}
dvander@2168: 		}
dvander@2168: 
dvander@2168: 		UTIL_Format(targetfile, sizeof(targetfile), "%s" PATH_SEP_CHAR FILENAME_1_4_EP1, thisfile);
dvander@2168: 
dvander@2168: 		return _GetPluginPtr(targetfile, METAMOD_FAIL_API_V1);
dvander@2168: 	}
dvander@2168: 
dvander@2168: 	return NULL;
dvander@2168: }
dvander@2168: 
dvander@2168: #if defined _MSC_VER
dvander@2168: BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved)
dvander@2168: {
dvander@2168: 	if (fdwReason == DLL_PROCESS_DETACH)
dvander@2168: 	{
dvander@2168: 		UnloadInterface_MMS();
dvander@2168: 	}
dvander@2168: 	return TRUE;
dvander@2168: }
dvander@2168: #else
dvander@2168: __attribute__((destructor)) static void gcc_fini()
dvander@2168: {
dvander@2168: 	UnloadInterface_MMS();
dvander@2168: }
dvander@2168: #endif
dvander@2168: 
dvander@2168: /* Overload a few things to prevent libstdc++ linking */
dvander@2168: #if defined __linux__
dvander@2168: extern "C" void __cxa_pure_virtual(void)
dvander@2168: {
dvander@2168: }
dvander@2168: 
dvander@2168: void *operator new(size_t size)
dvander@2168: {
dvander@2168: 	return malloc(size);
dvander@2168: }
dvander@2168: 
dvander@2168: void *operator new[](size_t size)
dvander@2168: {
dvander@2168: 	return malloc(size);
dvander@2168: }
dvander@2168: 
dvander@2168: void operator delete(void *ptr)
dvander@2168: {
dvander@2168: 	free(ptr);
dvander@2168: }
dvander@2168: 
dvander@2168: void operator delete[](void * ptr)
dvander@2168: {
dvander@2168: 	free(ptr);
dvander@2168: }
dvander@2168: #endif
dvander@2168: 
dvander@2168: