1.4.1
by Patrick Matthäi
Import upstream version 1.0 |
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/*
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* Copyright (C) 2004-2012 See the AUTHORS file for details.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <znc/Socket.h> |
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#include <znc/Modules.h> |
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#include <znc/User.h> |
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#include <znc/IRCNetwork.h> |
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#include <znc/znc.h> |
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#include <signal.h> |
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/* We should need 2 DNS threads (host, bindhost) per IRC connection */
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static const size_t MAX_IDLE_THREADS = 2; |
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unsigned int CSockManager::GetAnonConnectionCount(const CString &sIP) const { |
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const_iterator it; |
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unsigned int ret = 0; |
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for (it = begin(); it != end(); ++it) { |
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Csock *pSock = *it; |
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// Logged in CClients have "USR::<username>" as their sockname
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if (pSock->GetType() == Csock::INBOUND && pSock->GetRemoteIP() == sIP |
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&& pSock->GetSockName().Left(5) != "USR::") { |
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ret++; |
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}
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}
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DEBUG("There are [" << ret << "] clients from [" << sIP << "]"); |
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return ret; |
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}
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int CZNCSock::ConvertAddress(const struct sockaddr_storage * pAddr, socklen_t iAddrLen, CS_STRING & sIP, u_short * piPort) { |
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int ret = Csock::ConvertAddress(pAddr, iAddrLen, sIP, piPort); |
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if (ret == 0) |
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sIP.TrimPrefix("::ffff:"); |
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return ret; |
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}
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#ifdef HAVE_THREADED_DNS
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class CSockManager::CTDNSMonitorFD : public CSMonitorFD { |
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CSockManager* m_Manager; |
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public: |
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CTDNSMonitorFD(CSockManager* mgr) { |
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m_Manager = mgr; |
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Add(mgr->m_iTDNSpipe[0], ECT_Read); |
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}
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virtual bool FDsThatTriggered(const std::map<int, short>& miiReadyFds) { |
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if (miiReadyFds.find(m_Manager->m_iTDNSpipe[0])->second) { |
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m_Manager->RetrieveTDNSResult(); |
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}
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return true; |
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}
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};
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bool CSockManager::ThreadNeeded(struct TDNSStatus* threadStatus) |
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{
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// We should keep a number of idle threads alive
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if (threadStatus->num_idle > MAX_IDLE_THREADS) |
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return false; |
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// If ZNC is shutting down, all threads should exit
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return !threadStatus->done; |
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}
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void* CSockManager::TDNSThread(void* argument) { |
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TDNSStatus *threadStatus = (TDNSStatus *) argument; |
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pthread_mutex_lock(&threadStatus->mutex); |
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threadStatus->num_threads++; |
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threadStatus->num_idle++; |
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while (true) { |
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/* Wait for a DNS job for us to do. This is a while()-loop
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* because POSIX allows spurious wakeups from pthread_cond_wait.
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*/
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while (threadStatus->jobs.empty()) { |
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if (!ThreadNeeded(threadStatus)) |
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break; |
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pthread_cond_wait(&threadStatus->cond, &threadStatus->mutex); |
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}
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if (!ThreadNeeded(threadStatus)) |
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break; |
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/* Figure out a DNS job to do */
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assert(threadStatus->num_idle > 0); |
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TDNSArg *job = threadStatus->jobs.front(); |
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threadStatus->jobs.pop_front(); |
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threadStatus->num_idle--; |
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pthread_mutex_unlock(&threadStatus->mutex); |
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/* Now do the actual work */
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DoDNS(job); |
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pthread_mutex_lock(&threadStatus->mutex); |
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threadStatus->num_idle++; |
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}
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assert(threadStatus->num_threads > 0 && threadStatus->num_idle > 0); |
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threadStatus->num_threads--; |
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threadStatus->num_idle--; |
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pthread_mutex_unlock(&threadStatus->mutex); |
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return NULL; |
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}
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void CSockManager::DoDNS(TDNSArg *arg) { |
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int iCount = 0; |
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while (true) { |
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addrinfo hints; |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = AF_UNSPEC; |
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hints.ai_socktype = SOCK_STREAM; |
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hints.ai_protocol = IPPROTO_TCP; |
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hints.ai_flags = AI_ADDRCONFIG; |
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arg->iRes = getaddrinfo(arg->sHostname.c_str(), NULL, &hints, &arg->aiResult); |
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if (EAGAIN != arg->iRes) { |
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break; |
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}
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iCount++; |
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if (iCount > 5) { |
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arg->iRes = ETIMEDOUT; |
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break; |
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}
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sleep(5); // wait 5 seconds before next try |
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}
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size_t need = sizeof(TDNSArg*); |
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char* x = (char*)&arg; |
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// This write() must succeed because POSIX guarantees that writes of
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// less than PIPE_BUF are atomic (and PIPE_BUF is at least 512).
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size_t w = write(arg->fd, x, need); |
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if (w != need) { |
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DEBUG("Something bad happened during write() to a pipe from TDNSThread, wrote " << w << " bytes: " << strerror(errno)); |
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exit(1); |
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}
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}
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void CSockManager::StartTDNSThread(TDNSTask* task, bool bBind) { |
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CString sHostname = bBind ? task->sBindhost : task->sHostname; |
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TDNSArg* arg = new TDNSArg; |
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arg->sHostname = sHostname; |
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arg->task = task; |
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arg->fd = m_iTDNSpipe[1]; |
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arg->bBind = bBind; |
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arg->iRes = 0; |
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arg->aiResult = NULL; |
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pthread_mutex_lock(&m_threadStatus.mutex); |
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m_threadStatus.jobs.push_back(arg); |
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/* Do we need a new DNS thread? */
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if (m_threadStatus.num_idle > 0) { |
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/* Nope, there is one waiting for a job */
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pthread_cond_signal(&m_threadStatus.cond); |
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pthread_mutex_unlock(&m_threadStatus.mutex); |
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return; |
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}
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pthread_mutex_unlock(&m_threadStatus.mutex); |
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pthread_attr_t attr; |
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if (pthread_attr_init(&attr)) { |
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CString sError = "Couldn't init pthread_attr for " + sHostname; |
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DEBUG(sError); |
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CZNC::Get().Broadcast(sError, /* bAdminOnly = */ true); |
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SetTDNSThreadFinished(task, bBind, NULL); |
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return; |
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}
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
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pthread_t thr; |
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sigset_t old_sigmask; |
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sigset_t sigmask; |
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sigfillset(&sigmask); |
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/* Block all signals. The thread will inherit our signal mask and thus
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* won't ever try to handle any signals.
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*/
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if (pthread_sigmask(SIG_SETMASK, &sigmask, &old_sigmask)) { |
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CString sError = "Couldn't block signals"; |
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DEBUG(sError); |
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CZNC::Get().Broadcast(sError, /* bAdminOnly = */ true); |
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delete arg; |
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pthread_attr_destroy(&attr); |
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SetTDNSThreadFinished(task, bBind, NULL); |
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return; |
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}
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if (pthread_create(&thr, &attr, TDNSThread, &m_threadStatus)) { |
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CString sError = "Couldn't create thread for " + sHostname; |
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DEBUG(sError); |
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CZNC::Get().Broadcast(sError, /* bAdminOnly = */ true); |
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delete arg; |
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pthread_attr_destroy(&attr); |
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SetTDNSThreadFinished(task, bBind, NULL); |
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return; |
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}
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if (pthread_sigmask(SIG_SETMASK, &old_sigmask, NULL)) { |
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CString sError = "Couldn't unblock signals"; |
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DEBUG(sError); |
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CZNC::Get().Broadcast(sError, /* bAdminOnly = */ true); |
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delete arg; |
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pthread_attr_destroy(&attr); |
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SetTDNSThreadFinished(task, bBind, NULL); |
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return; |
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}
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pthread_attr_destroy(&attr); |
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}
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void CSockManager::SetTDNSThreadFinished(TDNSTask* task, bool bBind, addrinfo* aiResult) { |
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if (bBind) { |
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task->aiBind = aiResult; |
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task->bDoneBind = true; |
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} else { |
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task->aiTarget = aiResult; |
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task->bDoneTarget = true; |
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}
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// Now that something is done, check if everything we needed is done
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if (!task->bDoneBind || !task->bDoneTarget) { |
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return; |
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}
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// All needed DNS is done, now collect the results
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addrinfo* aiTarget = NULL; |
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addrinfo* aiBind = NULL; |
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try { |
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addrinfo* aiTarget4 = task->aiTarget; |
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addrinfo* aiBind4 = task->aiBind; |
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while (aiTarget4 && aiTarget4->ai_family != AF_INET) aiTarget4 = aiTarget4->ai_next; |
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while (aiBind4 && aiBind4->ai_family != AF_INET) aiBind4 = aiBind4->ai_next; |
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addrinfo* aiTarget6 = NULL; |
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addrinfo* aiBind6 = NULL; |
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#ifdef HAVE_IPV6
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aiTarget6 = task->aiTarget; |
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aiBind6 = task->aiBind; |
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while (aiTarget6 && aiTarget6->ai_family != AF_INET6) aiTarget6 = aiTarget6->ai_next; |
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while (aiBind6 && aiBind6->ai_family != AF_INET6) aiBind6 = aiBind6->ai_next; |
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#endif
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if (!aiTarget4 && !aiTarget6) { |
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throw "Can't resolve server hostname"; |
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} else if (task->sBindhost.empty()) { |
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#ifdef HAVE_IPV6
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aiTarget = task->aiTarget; |
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#else
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aiTarget = aiTarget4; |
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#endif
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} else if (!aiBind4 && !aiBind6) { |
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throw "Can't resolve bind hostname. Try /znc clearbindhost and /znc clearuserbindhost"; |
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} else if (aiBind6 && aiTarget6) { |
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aiTarget = aiTarget6; |
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aiBind = aiBind6; |
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} else if (aiBind4 && aiTarget4) { |
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aiTarget = aiTarget4; |
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aiBind = aiBind4; |
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} else { |
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throw "Address family of bindhost doesn't match address family of server"; |
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}
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CString sBindhost; |
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CString sTargetHost; |
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if (!task->sBindhost.empty()) { |
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char s[INET6_ADDRSTRLEN] = {}; |
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getnameinfo(aiBind->ai_addr, aiBind->ai_addrlen, s, sizeof(s), NULL, 0, NI_NUMERICHOST); |
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sBindhost = s; |
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}
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char s[INET6_ADDRSTRLEN] = {}; |
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getnameinfo(aiTarget->ai_addr, aiTarget->ai_addrlen, s, sizeof(s), NULL, 0, NI_NUMERICHOST); |
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sTargetHost = s; |
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DEBUG("TDNS: " << task->sSockName << ", connecting to [" << sTargetHost << "] using bindhost [" << sBindhost << "]"); |
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FinishConnect(sTargetHost, task->iPort, task->sSockName, task->iTimeout, task->bSSL, sBindhost, task->pcSock); |
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} catch (const char* s) { |
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DEBUG(task->sSockName << ", dns resolving error: " << s); |
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task->pcSock->SetSockName(task->sSockName); |
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task->pcSock->SockError(-1, s); |
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delete task->pcSock; |
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}
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if (task->aiTarget) freeaddrinfo(task->aiTarget); |
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if (task->aiBind) freeaddrinfo(task->aiBind); |
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delete task; |
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}
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void CSockManager::RetrieveTDNSResult() { |
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TDNSArg* a = NULL; |
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size_t readed = 0; |
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size_t need = sizeof(TDNSArg*); |
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char* x = (char*)&a; |
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while (readed < need) { |
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ssize_t r = read(m_iTDNSpipe[0], x, need - readed); |
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if (-1 == r) { |
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DEBUG("Something bad happened during read() from a pipe when getting result of TDNSThread: " << strerror(errno)); |
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exit(1); |
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}
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readed += r; |
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x += r; |
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}
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TDNSTask* task = a->task; |
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if (0 != a->iRes) { |
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DEBUG("Error in threaded DNS: " << gai_strerror(a->iRes)); |
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if (a->aiResult) { |
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DEBUG("And aiResult is not NULL..."); |
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}
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a->aiResult = NULL; // just for case. Maybe to call freeaddrinfo()? |
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}
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SetTDNSThreadFinished(task, a->bBind, a->aiResult); |
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delete a; |
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}
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#endif /* HAVE_THREADED_DNS */ |
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CSockManager::CSockManager() { |
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#ifdef HAVE_THREADED_DNS
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int m = pthread_mutex_init(&m_threadStatus.mutex, NULL); |
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if (m) { |
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CUtils::PrintError("Can't initialize mutex: " + CString(strerror(errno))); |
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exit(1); |
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}
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m = pthread_cond_init(&m_threadStatus.cond, NULL); |
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if (m) { |
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CUtils::PrintError("Can't initialize condition variable: " + CString(strerror(errno))); |
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exit(1); |
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}
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m_threadStatus.num_threads = 0; |
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m_threadStatus.num_idle = 0; |
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m_threadStatus.done = false; |
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if (pipe(m_iTDNSpipe)) { |
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DEBUG("Ouch, can't open pipe for threaded DNS resolving: " << strerror(errno)); |
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exit(1); |
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}
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MonitorFD(new CTDNSMonitorFD(this)); |
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#endif
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}
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CSockManager::~CSockManager() { |
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#ifdef HAVE_THREADED_DNS
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/* Anyone has an idea how this can be done less ugly? */
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pthread_mutex_lock(&m_threadStatus.mutex); |
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m_threadStatus.done = true; |
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while (m_threadStatus.num_threads > 0) { |
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pthread_cond_broadcast(&m_threadStatus.cond); |
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pthread_mutex_unlock(&m_threadStatus.mutex); |
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usleep(100); |
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pthread_mutex_lock(&m_threadStatus.mutex); |
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}
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pthread_mutex_unlock(&m_threadStatus.mutex); |
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pthread_cond_destroy(&m_threadStatus.cond); |
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pthread_mutex_destroy(&m_threadStatus.mutex); |
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#endif
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}
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void CSockManager::Connect(const CString& sHostname, u_short iPort, const CString& sSockName, int iTimeout, bool bSSL, const CString& sBindHost, CZNCSock *pcSock) { |
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#ifdef HAVE_THREADED_DNS
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DEBUG("TDNS: initiating resolving of [" << sHostname << "] and bindhost [" << sBindHost << "]"); |
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363 |
TDNSTask* task = new TDNSTask; |
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364 |
task->sHostname = sHostname; |
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task->iPort = iPort; |
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task->sSockName = sSockName; |
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task->iTimeout = iTimeout; |
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task->bSSL = bSSL; |
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task->sBindhost = sBindHost; |
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task->pcSock = pcSock; |
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task->aiTarget = NULL; |
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task->aiBind = NULL; |
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task->bDoneTarget = false; |
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if (sBindHost.empty()) { |
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task->bDoneBind = true; |
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} else { |
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task->bDoneBind = false; |
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StartTDNSThread(task, true); |
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}
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380 |
StartTDNSThread(task, false); |
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#else /* HAVE_THREADED_DNS */ |
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// Just let Csocket handle DNS itself
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FinishConnect(sHostname, iPort, sSockName, iTimeout, bSSL, sBindHost, pcSock); |
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#endif
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}
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void CSockManager::FinishConnect(const CString& sHostname, u_short iPort, const CString& sSockName, int iTimeout, bool bSSL, const CString& sBindHost, CZNCSock *pcSock) { |
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388 |
CSConnection C(sHostname, iPort, iTimeout); |
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389 |
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390 |
C.SetSockName(sSockName); |
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C.SetIsSSL(bSSL); |
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C.SetBindHost(sBindHost); |
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TSocketManager<CZNCSock>::Connect(C, pcSock); |
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}
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396 |
||
397 |
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398 |
/////////////////// CSocket ///////////////////
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399 |
CSocket::CSocket(CModule* pModule) : CZNCSock() { |
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400 |
m_pModule = pModule; |
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401 |
if (m_pModule) m_pModule->AddSocket(this); |
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402 |
EnableReadLine(); |
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403 |
SetMaxBufferThreshold(10240); |
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}
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405 |
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406 |
CSocket::CSocket(CModule* pModule, const CString& sHostname, unsigned short uPort, int iTimeout) : CZNCSock(sHostname, uPort, iTimeout) { |
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407 |
m_pModule = pModule; |
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408 |
if (m_pModule) m_pModule->AddSocket(this); |
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409 |
EnableReadLine(); |
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410 |
SetMaxBufferThreshold(10240); |
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411 |
}
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412 |
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413 |
CSocket::~CSocket() { |
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414 |
CUser *pUser = NULL; |
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415 |
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416 |
// CWebSock could cause us to have a NULL pointer here
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417 |
if (m_pModule) { |
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418 |
pUser = m_pModule->GetUser(); |
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419 |
m_pModule->UnlinkSocket(this); |
|
420 |
}
|
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421 |
||
422 |
if (pUser && m_pModule && (m_pModule->GetType() != CModInfo::GlobalModule)) { |
|
423 |
pUser->AddBytesWritten(GetBytesWritten()); |
|
424 |
pUser->AddBytesRead(GetBytesRead()); |
|
425 |
} else { |
|
426 |
CZNC::Get().AddBytesWritten(GetBytesWritten()); |
|
427 |
CZNC::Get().AddBytesRead(GetBytesRead()); |
|
428 |
}
|
|
429 |
}
|
|
430 |
||
431 |
void CSocket::ReachedMaxBuffer() { |
|
432 |
DEBUG(GetSockName() << " == ReachedMaxBuffer()"); |
|
433 |
if (m_pModule) m_pModule->PutModule("Some socket reached its max buffer limit and was closed!"); |
|
434 |
Close(); |
|
435 |
}
|
|
436 |
||
437 |
void CSocket::SockError(int iErrno, const CString& sDescription) { |
|
438 |
DEBUG(GetSockName() << " == SockError(" << sDescription << ", " << strerror(iErrno) << ")"); |
|
439 |
if (iErrno == EMFILE) { |
|
440 |
// We have too many open fds, this can cause a busy loop.
|
|
441 |
Close(); |
|
442 |
}
|
|
443 |
}
|
|
444 |
||
445 |
bool CSocket::ConnectionFrom(const CString& sHost, unsigned short uPort) { |
|
446 |
return CZNC::Get().AllowConnectionFrom(sHost); |
|
447 |
}
|
|
448 |
||
449 |
bool CSocket::Connect(const CString& sHostname, unsigned short uPort, bool bSSL, unsigned int uTimeout) { |
|
450 |
if (!m_pModule) { |
|
451 |
DEBUG("ERROR: CSocket::Connect called on instance without m_pModule handle!"); |
|
452 |
return false; |
|
453 |
}
|
|
454 |
||
455 |
CUser* pUser = m_pModule->GetUser(); |
|
456 |
CString sSockName = "MOD::C::" + m_pModule->GetModName(); |
|
457 |
CString sBindHost; |
|
458 |
||
459 |
if (pUser) { |
|
460 |
sSockName += "::" + pUser->GetUserName(); |
|
461 |
sBindHost = pUser->GetBindHost(); |
|
462 |
CIRCNetwork* pNetwork = m_pModule->GetNetwork(); |
|
463 |
if (pNetwork) { |
|
464 |
sSockName += "::" + pNetwork->GetName(); |
|
465 |
sBindHost = pNetwork->GetBindHost(); |
|
466 |
}
|
|
467 |
}
|
|
468 |
||
469 |
// Don't overwrite the socket name if one is already set
|
|
470 |
if (!GetSockName().empty()) { |
|
471 |
sSockName = GetSockName(); |
|
472 |
}
|
|
473 |
||
474 |
m_pModule->GetManager()->Connect(sHostname, uPort, sSockName, uTimeout, bSSL, sBindHost, this); |
|
475 |
return true; |
|
476 |
}
|
|
477 |
||
478 |
bool CSocket::Listen(unsigned short uPort, bool bSSL, unsigned int uTimeout) { |
|
479 |
if (!m_pModule) { |
|
480 |
DEBUG("ERROR: CSocket::Listen called on instance without m_pModule handle!"); |
|
481 |
return false; |
|
482 |
}
|
|
483 |
||
484 |
CUser* pUser = m_pModule->GetUser(); |
|
485 |
CString sSockName = "MOD::L::" + m_pModule->GetModName(); |
|
486 |
||
487 |
if (pUser) { |
|
488 |
sSockName += "::" + pUser->GetUserName(); |
|
489 |
}
|
|
490 |
// Don't overwrite the socket name if one is already set
|
|
491 |
if (!GetSockName().empty()) { |
|
492 |
sSockName = GetSockName(); |
|
493 |
}
|
|
494 |
||
495 |
return m_pModule->GetManager()->ListenAll(uPort, sSockName, bSSL, SOMAXCONN, this); |
|
496 |
}
|
|
497 |
||
498 |
CModule* CSocket::GetModule() const { return m_pModule; } |
|
499 |
/////////////////// !CSocket ///////////////////
|