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