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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* 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 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/>.
*/
#include "inspircd.h"
#ifndef _WIN32
# include <dlfcn.h>
#endif
/** The extension that dynamic libraries end with. */
#define DLL_EXTENSION ".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.assign(name + " is not a module (no " DLL_EXTENSION " extension)");
return;
}
#ifdef _WIN32
lib = LoadLibraryA(name.c_str());
#else
lib = dlopen(name.c_str(), RTLD_NOW|RTLD_LOCAL);
#endif
if (!lib)
RetrieveLastError();
}
DLLManager::~DLLManager()
{
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;
}
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)();
}
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);
}
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