source: unix.c @ ba3a8a5

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2004 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Main file (Unix specific part)                                       */

/*
  This program 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; either version 2 of the License, or
  (at your option) any later version.

  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#include "bitlbee.h"
#include "commands.h"
#include "crypting.h"
#include "protocols/nogaim.h"
#include "help.h"
#include "ipc.h"
#include <signal.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <pwd.h>

global_t global;        /* Against global namespace pollution */

static void sighandler( int signal );

int main( int argc, char *argv[] )
{
        int i = 0;
        char *old_cwd = NULL;
        struct sigaction sig, old;
        
        log_init();
        global.conf_file = g_strdup( CONF_FILE_DEF );
        global.conf = conf_load( argc, argv );
        if( global.conf == NULL )
                return( 1 );
        
        b_main_init();
        nogaim_init();
        
        srand( time( NULL ) ^ getpid() );
        global.helpfile = g_strdup( HELP_FILE );
        
        if( global.conf->runmode == RUNMODE_INETD )
        {
                log_link( LOGLVL_ERROR, LOGOUTPUT_IRC );
                log_link( LOGLVL_WARNING, LOGOUTPUT_IRC );
        
                i = bitlbee_inetd_init();
                log_message( LOGLVL_INFO, "Bitlbee %s starting in inetd mode.", BITLBEE_VERSION );

        }
        else if( global.conf->runmode == RUNMODE_DAEMON )
        {
                log_link( LOGLVL_ERROR, LOGOUTPUT_SYSLOG );
                log_link( LOGLVL_WARNING, LOGOUTPUT_SYSLOG );

                i = bitlbee_daemon_init();
                log_message( LOGLVL_INFO, "Bitlbee %s starting in daemon mode.", BITLBEE_VERSION );
        }
        else if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                /* In case the operator requests a restart, we need this. */
                old_cwd = g_malloc( 256 );
                if( getcwd( old_cwd, 255 ) == NULL )
                {
                        log_message( LOGLVL_WARNING, "Could not save current directory: %s", strerror( errno ) );
                        g_free( old_cwd );
                        old_cwd = NULL;
                }
                
                i = bitlbee_daemon_init();
                log_message( LOGLVL_INFO, "Bitlbee %s starting in forking daemon mode.", BITLBEE_VERSION );
        }
        if( i != 0 )
                return( i );
        
        if( ( global.conf->user && *global.conf->user ) &&
            ( global.conf->runmode == RUNMODE_DAEMON || 
              global.conf->runmode == RUNMODE_FORKDAEMON ) &&
            ( !getuid() || !geteuid() ) )
        {
                struct passwd *pw = NULL;
                pw = getpwnam( global.conf->user );
                if( pw )
                {
                        setgid( pw->pw_gid );
                        setuid( pw->pw_uid );
                }
        }

        global.storage = storage_init( global.conf->primary_storage, global.conf->migrate_storage );
        if( global.storage == NULL )
        {
                log_message( LOGLVL_ERROR, "Unable to load storage backend '%s'", global.conf->primary_storage );
                return( 1 );
        }
        
        /* Catch some signals to tell the user what's happening before quitting */
        memset( &sig, 0, sizeof( sig ) );
        sig.sa_handler = sighandler;
        sigaction( SIGCHLD, &sig, &old );
        sigaction( SIGPIPE, &sig, &old );
        sig.sa_flags = SA_RESETHAND;
        sigaction( SIGINT,  &sig, &old );
        sigaction( SIGILL,  &sig, &old );
        sigaction( SIGBUS,  &sig, &old );
        sigaction( SIGFPE,  &sig, &old );
        sigaction( SIGSEGV, &sig, &old );
        sigaction( SIGTERM, &sig, &old );
        sigaction( SIGQUIT, &sig, &old );
        sigaction( SIGXCPU, &sig, &old );
        
        if( !getuid() || !geteuid() )
                log_message( LOGLVL_WARNING, "BitlBee is running with root privileges. Why?" );
        if( help_init( &global.help, global.helpfile ) == NULL )
                log_message( LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE );
        
        b_main_run();
        
        /* Mainly good for restarting, to make sure we close the help.txt fd. */
        help_free( &global.help );
        
        if( global.restart )
        {
                char *fn = ipc_master_save_state();
                
                chdir( old_cwd );
                
                setenv( "_BITLBEE_RESTART_STATE", fn, 1 );
                g_free( fn );
                
                close( global.listen_socket );
                
                if( execv( argv[0], argv ) == -1 )
                        /* Apparently the execve() failed, so let's just
                           jump back into our own/current main(). */
                        /* Need more cleanup code to make this work. */
                        return 1; /* main( argc, argv ); */
        }
        
        return( 0 );
}

static void sighandler( int signal )
{
        /* FIXME: Calling log_message() here is not a very good idea! */
        
        if( signal == SIGTERM )
        {
                static int first = 1;
                
                if( first )
                {
                        /* We don't know what we were doing when this signal came in. It's not safe to touch
                           the user data now (not to mention writing them to disk), so add a timer. */
                        
                        log_message( LOGLVL_ERROR, "SIGTERM received, cleaning up process." );
                        b_timeout_add( 1, (b_event_handler) bitlbee_shutdown, NULL );
                        
                        first = 0;
                }
                else
                {
                        /* Well, actually, for now we'll never need this part because this signal handler
                           will never be called more than once in a session for a non-SIGPIPE signal...
                           But just in case we decide to change that: */
                        
                        log_message( LOGLVL_ERROR, "SIGTERM received twice, so long for a clean shutdown." );
                        raise( signal );
                }
        }
        else if( signal == SIGCHLD )
        {
                pid_t pid;
                int st;
                
                while( ( pid = waitpid( 0, &st, WNOHANG ) ) > 0 )
                {
                        if( WIFSIGNALED( st ) )
                                log_message( LOGLVL_INFO, "Client %d terminated normally. (status = %d)", (int) pid, WEXITSTATUS( st ) );
                        else if( WIFEXITED( st ) )
                                log_message( LOGLVL_INFO, "Client %d killed by signal %d.", (int) pid, WTERMSIG( st ) );
                }
        }
        else if( signal != SIGPIPE )
        {
                log_message( LOGLVL_ERROR, "Fatal signal received: %d. That's probably a bug.", signal );
                raise( signal );
        }
}

double gettime()
{
        struct timeval time[1];

        gettimeofday( time, 0 );
        return( (double) time->tv_sec + (double) time->tv_usec / 1000000 );
}