199 lines
6.3 KiB
C++
199 lines
6.3 KiB
C++
#include <xmpp/biboumi_component.hpp>
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#include <utils/timed_events.hpp>
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#include <network/poller.hpp>
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#include <config/config.hpp>
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#include <logger/logger.hpp>
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#include <utils/reload.hpp>
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#include <utils/xdg.hpp>
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#include <iostream>
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#include <memory>
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#include <atomic>
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#include <signal.h>
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#ifdef CARES_FOUND
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# include <network/dns_handler.hpp>
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#endif
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// A flag set by the SIGINT signal handler.
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static volatile std::atomic<bool> stop(false);
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// Flag set by the SIGUSR1/2 signal handler.
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static volatile std::atomic<bool> reload(false);
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// A flag indicating that we are wanting to exit the process. i.e: if this
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// flag is set and all connections are closed, we can exit properly.
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static bool exiting = false;
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/**
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* Provide an helpful message to help the user write a minimal working
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* configuration file.
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*/
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int config_help(const std::string& missing_option)
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{
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if (!missing_option.empty())
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std::cerr << "Error: empty value for option " << missing_option << "." << std::endl;
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std::cerr <<
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"Please provide a configuration file filled like this:\n\n"
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"hostname=irc.example.com\npassword=S3CR3T"
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<< std::endl;
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return 1;
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}
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static void sigint_handler(int sig, siginfo_t*, void*)
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{
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// We reset the SIGTERM or SIGINT (the one that didn't trigger this
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// handler) signal handler to its default value. This avoid calling this
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// handler twice, if the process receive both signals in a quick
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// succession.
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int sig_to_reset = (sig == SIGINT? SIGTERM: SIGINT);
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sigset_t mask;
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sigemptyset(&mask);
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struct sigaction sigreset = {};
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sigreset.sa_handler = SIG_DFL;
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sigreset.sa_mask = mask;
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sigaction(sig_to_reset, &sigreset, nullptr);
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// In 2 seconds, repeat the same signal, to force the exit
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TimedEventsManager::instance().add_event(TimedEvent(std::chrono::steady_clock::now() + 2s,
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[sig]() { raise(sig); }));
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stop.store(true);
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}
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static void sigusr_handler(int, siginfo_t*, void*)
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{
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reload.store(true);
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}
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int main(int ac, char** av)
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{
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if (ac > 1)
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Config::filename = av[1];
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else
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Config::filename = xdg_config_path("biboumi.cfg");
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Config::file_must_exist = true;
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std::cerr << "Using configuration file: " << Config::filename << std::endl;
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std::string password;
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try { // The file must exist
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password = Config::get("password", "");
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}
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catch (const std::ios::failure& e) {
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return config_help("");
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}
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const std::string hostname = Config::get("hostname", "");
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if (password.empty())
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return config_help("password");
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if (hostname.empty())
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return config_help("hostname");
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// Block the signals we want to manage. They will be unblocked only during
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// the epoll_pwait or ppoll calls. This avoids some race conditions,
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// explained in man 2 pselect on linux
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGTERM);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGUSR2);
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sigprocmask(SIG_BLOCK, &mask, nullptr);
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// Install the signals used to exit the process cleanly, or reload the
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// config
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sigemptyset(&mask);
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struct sigaction on_sigint;
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on_sigint.sa_sigaction = &sigint_handler;
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on_sigint.sa_mask = mask;
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// we want to catch that signal only once.
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// Sending SIGINT again will "force" an exit
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on_sigint.sa_flags = SA_RESETHAND;
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sigaction(SIGINT, &on_sigint, nullptr);
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sigaction(SIGTERM, &on_sigint, nullptr);
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// Install a signal to reload the config on SIGUSR1/2
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struct sigaction on_sigusr;
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on_sigusr.sa_sigaction = &sigusr_handler;
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on_sigusr.sa_mask = mask;
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on_sigusr.sa_flags = 0;
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sigaction(SIGUSR1, &on_sigusr, nullptr);
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sigaction(SIGUSR2, &on_sigusr, nullptr);
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auto p = std::make_shared<Poller>();
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auto xmpp_component =
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std::make_shared<BiboumiComponent>(p, hostname, password);
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xmpp_component->start();
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#ifdef CARES_FOUND
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DNSHandler::instance.watch_dns_sockets(p);
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#endif
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auto timeout = TimedEventsManager::instance().get_timeout();
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while (p->poll(timeout) != -1)
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{
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TimedEventsManager::instance().execute_expired_events();
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// Check for empty irc_clients (not connected, or with no joined
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// channel) and remove them
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xmpp_component->clean();
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if (stop)
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{
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log_info("Signal received, exiting...");
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exiting = true;
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stop.store(false);
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xmpp_component->shutdown();
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// Cancel the timer for a potential reconnection
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TimedEventsManager::instance().cancel("XMPP reconnection");
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}
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if (reload)
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{
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log_info("Signal received, reloading the config...");
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::reload_process();
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reload.store(false);
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}
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// Reconnect to the XMPP server if this was not intended. This may have
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// happened because we sent something invalid to it and it decided to
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// close the connection. This is a bug that should be fixed, but we
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// still reconnect automatically instead of dropping everything
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if (!exiting && xmpp_component->ever_auth &&
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!xmpp_component->is_connected() &&
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!xmpp_component->is_connecting())
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{
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if (xmpp_component->first_connection_try == true)
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{ // immediately re-try to connect
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xmpp_component->reset();
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xmpp_component->start();
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}
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else
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{ // Re-connecting failed, we now try only each few seconds
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auto reconnect_later = [xmpp_component]()
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{
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xmpp_component->reset();
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xmpp_component->start();
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};
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TimedEvent event(std::chrono::steady_clock::now() + 2s,
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reconnect_later, "XMPP reconnection");
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TimedEventsManager::instance().add_event(std::move(event));
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}
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}
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// If the only existing connection is the one to the XMPP component:
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// close the XMPP stream.
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if (exiting && xmpp_component->is_connecting())
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xmpp_component->close();
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if (exiting && p->size() == 1 && xmpp_component->is_document_open())
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xmpp_component->close_document();
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#ifdef CARES_FOUND
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if (!exiting)
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DNSHandler::instance.watch_dns_sockets(p);
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#endif
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if (exiting) // If we are exiting, do not wait for any timed event
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timeout = utils::no_timeout;
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else
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timeout = TimedEventsManager::instance().get_timeout();
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}
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#ifdef CARES_FOUND
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DNSHandler::instance.destroy();
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#endif
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if (!xmpp_component->ever_auth)
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return 1; // To signal that the process did not properly start
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log_info("All connections cleanly closed, have a nice day.");
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return 0;
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}
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