Add support for blocking tag messages with the deaf mode.

[user/henk/code/inspircd.git] / src / dynamic.cpp

diff --git a/src/dynamic.cpp b/src/dynamic.cpp
index 340f40e19d0892f0f94a606e586f6c1f61957ccd..5f69820c9ec84805a1bae24f9f7009c193bc392f 100644 (file)
--- a/src/dynamic.cpp
+++ b/src/dynamic.cpp
@@ -1,11 +1,16 @@
 /*
  * InspIRCd -- Internet Relay Chat Daemon
  *
- *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
- *   Copyright (C) 2007 Oliver Lupton <oliverlupton@gmail.com>
+ *   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 Craig Edwards <craigedwards@brainbox.cc>
+ *   Copyright (C) 2003, 2006, 2010 Craig Edwards <brain@inspircd.org>
  *
  * 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
@@ -22,90 +27,109 @@
 
 
 #include "inspircd.h"
-
 #ifndef _WIN32
-#include <dlfcn.h>
-#else
-#define dlopen(path, state) (void*)LoadLibraryA(path)
-#define dlsym(handle, export) (void*)GetProcAddress((HMODULE)handle, export)
-#define dlclose(handle) FreeLibrary((HMODULE)handle)
+# include <dlfcn.h>
 #endif
 
-DLLManager::DLLManager(const char *fname)
+/** The extension that dynamic libraries end with. */
+#define DLL_EXTENSION ".so"
+
+DLLManager::DLLManager(const std::string& name)
+       : lib(NULL)
+       , libname(name)
 {
-       if (!strstr(fname,".so"))
+       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...";
-               h = NULL;
+               err.assign(name + " is not a module (no " DLL_EXTENSION " extension)");
                return;
        }
 
-       h = dlopen(fname, RTLD_NOW|RTLD_LOCAL);
-       if (!h)
-       {
 #ifdef _WIN32
-               RetrieveLastError();
+       lib = LoadLibraryA(name.c_str());
 #else
-               err = dlerror();
+       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;
 
-union init_t {
-       void* vptr;
-       Module* (*fptr)();
-};
+#ifdef _WIN32
+       FreeLibrary(lib);
+#else
+       dlclose(lib);
+#endif
+}
 
 Module* DLLManager::CallInit()
 {
-       if (!h)
+       if (!lib)
                return NULL;
 
-       init_t initfn;
-       initfn.vptr = dlsym(h, MODULE_INIT_STR);
-       if (!initfn.vptr)
+       const unsigned long* abi = GetSymbol<const unsigned long>(MODULE_STR_ABI);
+       if (!abi)
        {
-#ifdef _WIN32
-               RetrieveLastError();
-#else
-               err = dlerror();
-#endif
+               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;
        }
 
-       return (*initfn.fptr)();
+       union
+       {
+               void* vptr;
+               Module* (*fptr)();
+       };
+
+       vptr = GetSymbol(MODULE_STR_INIT);
+       if (!vptr)
+       {
+               err.assign(libname + " is not a module (no init symbol)");
+               return NULL;
+       }
+
+       return (*fptr)();
 }
 
-std::string DLLManager::GetVersion()
+void* DLLManager::GetSymbol(const char* name) const
 {
-       if (!h)
-               return "";
+       if (!lib)
+               return NULL;
 
-       const char* srcver = (char*)dlsym(h, "inspircd_src_version");
-       if (srcver)
-               return srcver;
-       return "";
+#if defined _WIN32
+       return GetProcAddress(lib, name);
+#else
+       return dlsym(lib, name);
+#endif
 }
 
-#ifdef _WIN32
 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);
 }
-#endif