X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fdynamic.cpp;h=5f69820c9ec84805a1bae24f9f7009c193bc392f;hb=e2b0f3dc9ef4d56c71d7abda13e6139ca092e387;hp=8731489c435cc5761f0a452b2ca6dbd5fedbaa90;hpb=6d03943426dcce76ba66567a9b18425a5ebb4c0c;p=user%2Fhenk%2Fcode%2Finspircd.git

diff --git a/src/dynamic.cpp b/src/dynamic.cpp
index 8731489c4..5f69820c9 100644
--- a/src/dynamic.cpp
+++ b/src/dynamic.cpp
@@ -1,67 +1,135 @@
-/*       +------------------------------------+
- *       | Inspire Internet Relay Chat Daemon |
- *       +------------------------------------+
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
  *
- *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
- * See: http://wiki.inspircd.org/Credits
+ *   Copyright (C) 2020 Matt Schatz <genius3000@g3k.solutions>
+ *   Copyright (C) 2017-2020 Sadie Powell <sadie@witchery.services>
+ *   Copyright (C) 2014 Attila Molnar <attilamolnar@hush.com>
+ *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
+ *   Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
+ *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
+ *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
+ *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
+ *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
+ *   Copyright (C) 2003, 2006, 2010 Craig Edwards <brain@inspircd.org>
  *
- * This program is free but copyrighted software; see
- *            the file COPYING for details.
+ * This file is part of InspIRCd.  InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
  *
- * ---------------------------------------------------
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* $Core */
 
 #include "inspircd.h"
-#include "dynamic.h"
-#ifndef WIN32
-#include <dlfcn.h>
+#ifndef _WIN32
+# include <dlfcn.h>
 #endif
 
-DLLManager::DLLManager(const char *fname)
-{
-	err = NULL;
+/** The extension that dynamic libraries end with. */
+#define DLL_EXTENSION ".so"
 
-	if (!strstr(fname,".so"))
+DLLManager::DLLManager(const std::string& name)
+	: lib(NULL)
+	, libname(name)
+{
+	static size_t extlen = strlen(DLL_EXTENSION);
+	if (name.length() <= extlen || name.compare(name.length() - extlen, name.length(), DLL_EXTENSION))
 	{
-		err = "This doesn't look like a module file to me...";
+		err.assign(name + " is not a module (no " DLL_EXTENSION " extension)");
 		return;
 	}
 
-	h = dlopen(fname, RTLD_NOW|RTLD_LOCAL);
-	if (!h)
-	{
-		err = dlerror();
-		return;
-	}
+#ifdef _WIN32
+	lib = LoadLibraryA(name.c_str());
+#else
+	lib = dlopen(name.c_str(), RTLD_NOW|RTLD_LOCAL);
+#endif
+
+	if (!lib)
+		RetrieveLastError();
 }
 
 DLLManager::~DLLManager()
 {
-	/* close the library */
-	if (h)
-		dlclose(h);
+	if (!lib)
+		return;
+
+#ifdef _WIN32
+	FreeLibrary(lib);
+#else
+	dlclose(lib);
+#endif
 }
 
+Module* DLLManager::CallInit()
+{
+	if (!lib)
+		return NULL;
 
+	const unsigned long* abi = GetSymbol<const unsigned long>(MODULE_STR_ABI);
+	if (!abi)
+	{
+		err.assign(libname + " is not a module (no ABI symbol)");
+		return NULL;
+	}
+	else if (*abi != MODULE_ABI)
+	{
+		const char* version = GetVersion();
+		err.assign(InspIRCd::Format("%s was built against %s (%lu) which is too %s to use with %s (%lu).",
+			libname.c_str(), version ? version : "an unknown version", *abi,
+			*abi < MODULE_ABI ? "old" : "new", INSPIRCD_VERSION, MODULE_ABI));
+		return NULL;
+	}
 
-bool DLLManager::GetSymbol(void** v, const char* sym_name)
-{
-	/*
-	 * try extract a symbol from the library
-	 * get any error message is there is any
-	 */
+	union
+	{
+		void* vptr;
+		Module* (*fptr)();
+	};
 
-	if (h)
+	vptr = GetSymbol(MODULE_STR_INIT);
+	if (!vptr)
 	{
-		dlerror(); // clear value
-		*v = dlsym(h, sym_name);
-		err = dlerror();
-		if (!*v || err)
-			return false;
+		err.assign(libname + " is not a module (no init symbol)");
+		return NULL;
 	}
 
-	/* succeeded :) */
-	return true;
+	return (*fptr)();
+}
+
+void* DLLManager::GetSymbol(const char* name) const
+{
+	if (!lib)
+		return NULL;
+
+#if defined _WIN32
+	return GetProcAddress(lib, name);
+#else
+	return dlsym(lib, name);
+#endif
+}
+
+void DLLManager::RetrieveLastError()
+{
+#if defined _WIN32
+	char errmsg[500];
+	DWORD dwErrorCode = GetLastError();
+	if (FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dwErrorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)errmsg, _countof(errmsg), NULL) == 0)
+		sprintf_s(errmsg, _countof(errmsg), "Error code: %u", dwErrorCode);
+	SetLastError(ERROR_SUCCESS);
+	err = errmsg;
+#else
+	const char* errmsg = dlerror();
+	err = errmsg ? errmsg : "Unknown error";
+#endif
+
+	std::string::size_type p;
+	while ((p = err.find_last_of("\r\n")) != std::string::npos)
+		err.erase(p, 1);
 }