source: unix.c @ 7549d00

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2012 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., 51 Franklin St.,
  Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "bitlbee.h"

#include "arc.h"
#include "base64.h"
#include "commands.h"
#include "protocols/nogaim.h"
#include "help.h"
#include "ipc.h"
#include "md5.h"
#include "misc.h"
#include <signal.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <pwd.h>
#include <locale.h>
#include <grp.h>

#if defined(OTR_BI) || defined(OTR_PI)
#include "otr.h"
#endif

global_t global;        /* Against global namespace pollution */

static int signal_shutdown_pipe[2] = { -1, -1 };
static void sighandler_shutdown( int signal );
static void sighandler_crash( int signal );

static int crypt_main( int argc, char *argv[] );

int main( int argc, char *argv[] )
{
        int i = 0;
        char *old_cwd = NULL;
        struct sigaction sig, old;
        
        /* Required to make iconv to ASCII//TRANSLIT work. This makes BitlBee
           system-locale-sensitive. :-( */
        setlocale( LC_CTYPE, "" );
        
        if( argc > 1 && strcmp( argv[1], "-x" ) == 0 )
                return crypt_main( argc, argv );
        
        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();
        
        /* libpurple doesn't like fork()s after initializing itself, so if
           we use it, do this init a little later (in case we're running in
           ForkDaemon mode). */
#ifndef WITH_PURPLE
        nogaim_init();
#endif
        
#ifdef OTR_BI
        otr_init();
#endif
        
        srand( time( NULL ) ^ getpid() );
        
        global.helpfile = g_strdup( HELP_FILE );
        if( help_init( &global.help, global.helpfile ) == NULL )
                log_message( LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE );

        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 );
        }
        
        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, "%s %s starting in inetd mode.", PACKAGE, BITLBEE_VERSION );

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

                i = bitlbee_daemon_init();
                log_message( LOGLVL_INFO, "%s %s starting in daemon mode.", PACKAGE, BITLBEE_VERSION );
        }
        else if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                log_link( LOGLVL_ERROR, LOGOUTPUT_CONSOLE );
                log_link( LOGLVL_WARNING, LOGOUTPUT_CONSOLE );

                /* 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, "%s %s starting in forking daemon mode.", PACKAGE, 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 )
                {
                        initgroups( global.conf->user, pw->pw_gid );
                        setgid( pw->pw_gid );
                        setuid( pw->pw_uid );
                }
                else
                {
                        log_message( LOGLVL_WARNING, "Failed to look up user %s.", global.conf->user );
                }
        }
        
        /* Catch some signals to tell the user what's happening before quitting */
        memset( &sig, 0, sizeof( sig ) );
        sig.sa_handler = SIG_IGN;
        sigaction( SIGCHLD, &sig, &old );
        sigaction( SIGPIPE, &sig, &old );
        sig.sa_flags = SA_RESETHAND;
        sig.sa_handler = sighandler_crash;
        sigaction( SIGSEGV, &sig, &old );

        /* Use a pipe for SIGTERM/SIGINT so the actual signal handler doesn't do anything unsafe */
        if ( pipe( signal_shutdown_pipe ) == 0 ) {
                b_input_add( signal_shutdown_pipe[0], B_EV_IO_READ, bitlbee_shutdown, NULL );
                sig.sa_handler = sighandler_shutdown;
                sigaction( SIGINT, &sig, &old );
                sigaction( SIGTERM, &sig, &old );
        }
        
        if( !getuid() || !geteuid() )
                log_message( LOGLVL_WARNING, "BitlBee is running with root privileges. Why?" );
        
        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();
                char *env;
                
                env = g_strdup_printf( "_BITLBEE_RESTART_STATE=%s", fn );
                putenv( env );
                g_free( fn );
                /* Looks like env should *not* be freed here as putenv
                   doesn't make a copy. Odd. */
                
                i = chdir( old_cwd );
                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 int crypt_main( int argc, char *argv[] )
{
        int pass_len;
        unsigned char *pass_cr, *pass_cl;
        
        if( argc < 4 || ( strcmp( argv[2], "hash" ) != 0 &&
                          strcmp( argv[2], "unhash" ) != 0 && argc < 5 ) )
        {
                printf( "Supported:\n"
                        "  %s -x enc <key> <cleartext password>\n"
                        "  %s -x dec <key> <encrypted password>\n"
                        "  %s -x hash <cleartext password>\n"
                        "  %s -x unhash <hashed password>\n"
                        "  %s -x chkhash <hashed password> <cleartext password>\n",
                        argv[0], argv[0], argv[0], argv[0], argv[0] );
        }
        else if( strcmp( argv[2], "enc" ) == 0 )
        {
                pass_len = arc_encode( argv[4], strlen( argv[4] ), (unsigned char**) &pass_cr, argv[3], 12 );
                printf( "%s\n", base64_encode( pass_cr, pass_len ) );
        }
        else if( strcmp( argv[2], "dec" ) == 0 )
        {
                pass_len = base64_decode( argv[4], (unsigned char**) &pass_cr );
                arc_decode( pass_cr, pass_len, (char**) &pass_cl, argv[3] );
                printf( "%s\n", pass_cl );
        }
        else if( strcmp( argv[2], "hash" ) == 0 )
        {
                md5_byte_t pass_md5[21];
                md5_state_t md5_state;
                
                random_bytes( pass_md5 + 16, 5 );
                md5_init( &md5_state );
                md5_append( &md5_state, (md5_byte_t*) argv[3], strlen( argv[3] ) );
                md5_append( &md5_state, pass_md5 + 16, 5 ); /* Add the salt. */
                md5_finish( &md5_state, pass_md5 );
                
                printf( "%s\n", base64_encode( pass_md5, 21 ) );
        }
        else if( strcmp( argv[2], "unhash" ) == 0 )
        {
                printf( "Hash %s submitted to a massive Beowulf cluster of\n"
                        "overclocked 486s. Expect your answer next year somewhere around this time. :-)\n", argv[3] );
        }
        else if( strcmp( argv[2], "chkhash" ) == 0 )
        {
                char *hash = strncmp( argv[3], "md5:", 4 ) == 0 ? argv[3] + 4 : argv[3];
                int st = md5_verify_password( argv[4], hash );
                
                printf( "Hash %s given password.\n", st == 0 ? "matches" : "does not match" );
                
                return st;
        }
        
        return 0;
}

/* Signal handler for SIGTERM and SIGINT */
static void sighandler_shutdown( int signal )
{
        /* Write a single null byte to the pipe, just to send a message to the main loop.
         * This gets handled by bitlbee_shutdown (the b_input_add callback for this pipe) */
        write( signal_shutdown_pipe[1], "", 1 );
}

/* Signal handler for SIGSEGV
 * A desperate attempt to tell the user that everything is wrong in the world.
 * Avoids using irc_abort() because it has several unsafe calls to malloc */
static void sighandler_crash( int signal )
{
        GSList *l;
        const char *message = "ERROR :BitlBee crashed! (SIGSEGV received)\r\n";
        int len = strlen(message);

        for (l = irc_connection_list; l; l = l->next ) {
                irc_t *irc = l->data;
                write( irc->fd, message, len );
        }

        raise( signal );
}

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

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