| 1 | /********************************************************************\ |
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| 2 | * BitlBee -- An IRC to other IM-networks gateway * |
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| 3 | * * |
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| 4 | * Copyright 2002-2004 Wilmer van der Gaast and others * |
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| 5 | \********************************************************************/ |
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| 6 | |
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| 7 | /* Main file (Unix specific part) */ |
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| 8 | |
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| 9 | /* |
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| 10 | This program is free software; you can redistribute it and/or modify |
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| 11 | it under the terms of the GNU General Public License as published by |
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| 12 | the Free Software Foundation; either version 2 of the License, or |
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| 13 | (at your option) any later version. |
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| 14 | |
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| 15 | This program is distributed in the hope that it will be useful, |
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | GNU General Public License for more details. |
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| 19 | |
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| 20 | You should have received a copy of the GNU General Public License with |
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| 21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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| 22 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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| 23 | Suite 330, Boston, MA 02111-1307 USA |
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| 24 | */ |
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| 25 | |
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| 26 | #include "bitlbee.h" |
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| 27 | |
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| 28 | #include "arc.h" |
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| 29 | #include "base64.h" |
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| 30 | #include "commands.h" |
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| 31 | #include "protocols/nogaim.h" |
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| 32 | #include "help.h" |
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| 33 | #include "ipc.h" |
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| 34 | #include "lib/ssl_client.h" |
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| 35 | #include "md5.h" |
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| 36 | #include "misc.h" |
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| 37 | #include <signal.h> |
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| 38 | #include <unistd.h> |
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| 39 | #include <sys/time.h> |
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| 40 | #include <sys/wait.h> |
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| 41 | #include <pwd.h> |
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| 42 | #include <locale.h> |
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| 43 | #include <grp.h> |
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| 44 | |
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| 45 | #if defined(OTR_BI) || defined(OTR_PI) |
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| 46 | #include "otr.h" |
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| 47 | #endif |
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| 48 | |
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| 49 | global_t global; /* Against global namespace pollution */ |
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| 50 | |
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| 51 | static void sighandler( int signal ); |
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| 52 | |
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| 53 | static int crypt_main( int argc, char *argv[] ); |
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| 54 | |
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| 55 | int main( int argc, char *argv[] ) |
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| 56 | { |
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| 57 | int i = 0; |
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| 58 | char *old_cwd = NULL; |
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| 59 | struct sigaction sig, old; |
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| 60 | |
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| 61 | /* Required to make iconv to ASCII//TRANSLIT work. This makes BitlBee |
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| 62 | system-locale-sensitive. :-( */ |
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| 63 | setlocale( LC_CTYPE, "" ); |
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| 64 | |
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| 65 | if( argc > 1 && strcmp( argv[1], "-x" ) == 0 ) |
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| 66 | return crypt_main( argc, argv ); |
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| 67 | |
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| 68 | log_init(); |
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| 69 | |
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| 70 | global.conf_file = g_strdup( CONF_FILE_DEF ); |
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| 71 | global.conf = conf_load( argc, argv ); |
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| 72 | if( global.conf == NULL ) |
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| 73 | return( 1 ); |
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| 74 | |
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| 75 | b_main_init(); |
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| 76 | |
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| 77 | /* libpurple doesn't like fork()s after initializing itself, so if |
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| 78 | we use it, do this init a little later (in case we're running in |
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| 79 | ForkDaemon mode). */ |
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| 80 | #ifndef WITH_PURPLE |
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| 81 | nogaim_init(); |
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| 82 | #endif |
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| 83 | |
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| 84 | /* Ugly Note: libotr and gnutls both use libgcrypt. libgcrypt |
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| 85 | has a process-global config state whose initialization happpens |
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| 86 | twice if libotr and gnutls are used together. libotr installs custom |
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| 87 | memory management functions for libgcrypt while our gnutls module |
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| 88 | uses the defaults. Therefore we initialize OTR after SSL. *sigh* */ |
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| 89 | ssl_init(); |
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| 90 | #ifdef OTR_BI |
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| 91 | otr_init(); |
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| 92 | #endif |
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| 93 | /* And in case OTR is loaded as a plugin, it'll also get loaded after |
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| 94 | this point. */ |
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| 95 | |
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| 96 | srand( time( NULL ) ^ getpid() ); |
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| 97 | |
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| 98 | global.helpfile = g_strdup( HELP_FILE ); |
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| 99 | if( help_init( &global.help, global.helpfile ) == NULL ) |
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| 100 | log_message( LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE ); |
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| 101 | |
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| 102 | global.storage = storage_init( global.conf->primary_storage, global.conf->migrate_storage ); |
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| 103 | if( global.storage == NULL ) |
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| 104 | { |
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| 105 | log_message( LOGLVL_ERROR, "Unable to load storage backend '%s'", global.conf->primary_storage ); |
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| 106 | return( 1 ); |
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| 107 | } |
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| 108 | |
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| 109 | if( global.conf->runmode == RUNMODE_INETD ) |
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| 110 | { |
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| 111 | log_link( LOGLVL_ERROR, LOGOUTPUT_IRC ); |
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| 112 | log_link( LOGLVL_WARNING, LOGOUTPUT_IRC ); |
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| 113 | |
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| 114 | i = bitlbee_inetd_init(); |
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| 115 | log_message( LOGLVL_INFO, "BitlBee %s starting in inetd mode.", BITLBEE_VERSION ); |
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| 116 | |
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| 117 | } |
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| 118 | else if( global.conf->runmode == RUNMODE_DAEMON ) |
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| 119 | { |
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| 120 | log_link( LOGLVL_ERROR, LOGOUTPUT_CONSOLE ); |
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| 121 | log_link( LOGLVL_WARNING, LOGOUTPUT_CONSOLE ); |
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| 122 | |
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| 123 | i = bitlbee_daemon_init(); |
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| 124 | log_message( LOGLVL_INFO, "BitlBee %s starting in daemon mode.", BITLBEE_VERSION ); |
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| 125 | } |
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| 126 | else if( global.conf->runmode == RUNMODE_FORKDAEMON ) |
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| 127 | { |
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| 128 | log_link( LOGLVL_ERROR, LOGOUTPUT_CONSOLE ); |
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| 129 | log_link( LOGLVL_WARNING, LOGOUTPUT_CONSOLE ); |
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| 130 | |
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| 131 | /* In case the operator requests a restart, we need this. */ |
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| 132 | old_cwd = g_malloc( 256 ); |
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| 133 | if( getcwd( old_cwd, 255 ) == NULL ) |
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| 134 | { |
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| 135 | log_message( LOGLVL_WARNING, "Could not save current directory: %s", strerror( errno ) ); |
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| 136 | g_free( old_cwd ); |
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| 137 | old_cwd = NULL; |
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| 138 | } |
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| 139 | |
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| 140 | i = bitlbee_daemon_init(); |
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| 141 | log_message( LOGLVL_INFO, "BitlBee %s starting in forking daemon mode.", BITLBEE_VERSION ); |
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| 142 | } |
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| 143 | if( i != 0 ) |
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| 144 | return( i ); |
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| 145 | |
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| 146 | if( ( global.conf->user && *global.conf->user ) && |
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| 147 | ( global.conf->runmode == RUNMODE_DAEMON || |
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| 148 | global.conf->runmode == RUNMODE_FORKDAEMON ) && |
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| 149 | ( !getuid() || !geteuid() ) ) |
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| 150 | { |
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| 151 | struct passwd *pw = NULL; |
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| 152 | pw = getpwnam( global.conf->user ); |
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| 153 | if( pw ) |
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| 154 | { |
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| 155 | initgroups( global.conf->user, pw->pw_gid ); |
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| 156 | setgid( pw->pw_gid ); |
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| 157 | setuid( pw->pw_uid ); |
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| 158 | } |
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| 159 | else |
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| 160 | { |
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| 161 | log_message( LOGLVL_WARNING, "Failed to look up user %s.", global.conf->user ); |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | /* Catch some signals to tell the user what's happening before quitting */ |
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| 166 | memset( &sig, 0, sizeof( sig ) ); |
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| 167 | sig.sa_handler = sighandler; |
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| 168 | sigaction( SIGCHLD, &sig, &old ); |
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| 169 | sigaction( SIGPIPE, &sig, &old ); |
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| 170 | sig.sa_flags = SA_RESETHAND; |
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| 171 | sigaction( SIGINT, &sig, &old ); |
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| 172 | sigaction( SIGILL, &sig, &old ); |
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| 173 | sigaction( SIGBUS, &sig, &old ); |
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| 174 | sigaction( SIGFPE, &sig, &old ); |
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| 175 | sigaction( SIGSEGV, &sig, &old ); |
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| 176 | sigaction( SIGTERM, &sig, &old ); |
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| 177 | sigaction( SIGQUIT, &sig, &old ); |
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| 178 | sigaction( SIGXCPU, &sig, &old ); |
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| 179 | |
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| 180 | if( !getuid() || !geteuid() ) |
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| 181 | log_message( LOGLVL_WARNING, "BitlBee is running with root privileges. Why?" ); |
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| 182 | |
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| 183 | b_main_run(); |
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| 184 | |
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| 185 | /* Mainly good for restarting, to make sure we close the help.txt fd. */ |
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| 186 | help_free( &global.help ); |
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| 187 | |
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| 188 | if( global.restart ) |
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| 189 | { |
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| 190 | char *fn = ipc_master_save_state(); |
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| 191 | char *env; |
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| 192 | |
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| 193 | env = g_strdup_printf( "_BITLBEE_RESTART_STATE=%s", fn ); |
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| 194 | putenv( env ); |
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| 195 | g_free( fn ); |
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| 196 | /* Looks like env should *not* be freed here as putenv |
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| 197 | doesn't make a copy. Odd. */ |
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| 198 | |
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| 199 | i = chdir( old_cwd ); |
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| 200 | close( global.listen_socket ); |
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| 201 | |
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| 202 | if( execv( argv[0], argv ) == -1 ) |
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| 203 | /* Apparently the execve() failed, so let's just |
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| 204 | jump back into our own/current main(). */ |
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| 205 | /* Need more cleanup code to make this work. */ |
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| 206 | return 1; /* main( argc, argv ); */ |
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| 207 | } |
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| 208 | |
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| 209 | return( 0 ); |
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| 210 | } |
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| 211 | |
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| 212 | static int crypt_main( int argc, char *argv[] ) |
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| 213 | { |
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| 214 | int pass_len; |
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| 215 | unsigned char *pass_cr, *pass_cl; |
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| 216 | |
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| 217 | if( argc < 4 || ( strcmp( argv[2], "hash" ) != 0 && |
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| 218 | strcmp( argv[2], "unhash" ) != 0 && argc < 5 ) ) |
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| 219 | { |
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| 220 | printf( "Supported:\n" |
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| 221 | " %s -x enc <key> <cleartext password>\n" |
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| 222 | " %s -x dec <key> <encrypted password>\n" |
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| 223 | " %s -x hash <cleartext password>\n" |
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| 224 | " %s -x unhash <hashed password>\n" |
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| 225 | " %s -x chkhash <hashed password> <cleartext password>\n", |
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| 226 | argv[0], argv[0], argv[0], argv[0], argv[0] ); |
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| 227 | } |
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| 228 | else if( strcmp( argv[2], "enc" ) == 0 ) |
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| 229 | { |
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| 230 | pass_len = arc_encode( argv[4], strlen( argv[4] ), (unsigned char**) &pass_cr, argv[3], 12 ); |
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| 231 | printf( "%s\n", base64_encode( pass_cr, pass_len ) ); |
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| 232 | } |
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| 233 | else if( strcmp( argv[2], "dec" ) == 0 ) |
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| 234 | { |
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| 235 | pass_len = base64_decode( argv[4], (unsigned char**) &pass_cr ); |
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| 236 | arc_decode( pass_cr, pass_len, (char**) &pass_cl, argv[3] ); |
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| 237 | printf( "%s\n", pass_cl ); |
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| 238 | } |
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| 239 | else if( strcmp( argv[2], "hash" ) == 0 ) |
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| 240 | { |
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| 241 | md5_byte_t pass_md5[21]; |
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| 242 | md5_state_t md5_state; |
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| 243 | |
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| 244 | random_bytes( pass_md5 + 16, 5 ); |
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| 245 | md5_init( &md5_state ); |
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| 246 | md5_append( &md5_state, (md5_byte_t*) argv[3], strlen( argv[3] ) ); |
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| 247 | md5_append( &md5_state, pass_md5 + 16, 5 ); /* Add the salt. */ |
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| 248 | md5_finish( &md5_state, pass_md5 ); |
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| 249 | |
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| 250 | printf( "%s\n", base64_encode( pass_md5, 21 ) ); |
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| 251 | } |
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| 252 | else if( strcmp( argv[2], "unhash" ) == 0 ) |
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| 253 | { |
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| 254 | printf( "Hash %s submitted to a massive Beowulf cluster of\n" |
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| 255 | "overclocked 486s. Expect your answer next year somewhere around this time. :-)\n", argv[3] ); |
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| 256 | } |
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| 257 | else if( strcmp( argv[2], "chkhash" ) == 0 ) |
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| 258 | { |
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| 259 | char *hash = strncmp( argv[3], "md5:", 4 ) == 0 ? argv[3] + 4 : argv[3]; |
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| 260 | int st = md5_verify_password( argv[4], hash ); |
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| 261 | |
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| 262 | printf( "Hash %s given password.\n", st == 0 ? "matches" : "does not match" ); |
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| 263 | |
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| 264 | return st; |
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| 265 | } |
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| 266 | |
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| 267 | return 0; |
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| 268 | } |
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| 269 | |
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| 270 | static void sighandler( int signal ) |
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| 271 | { |
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| 272 | /* FIXME: Calling log_message() here is not a very good idea! */ |
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| 273 | |
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| 274 | if( signal == SIGTERM || signal == SIGQUIT || signal == SIGINT ) |
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| 275 | { |
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| 276 | static int first = 1; |
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| 277 | |
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| 278 | if( first ) |
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| 279 | { |
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| 280 | /* We don't know what we were doing when this signal came in. It's not safe to touch |
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| 281 | the user data now (not to mention writing them to disk), so add a timer. */ |
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| 282 | |
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| 283 | log_message( LOGLVL_ERROR, "SIGTERM received, cleaning up process." ); |
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| 284 | b_timeout_add( 1, (b_event_handler) bitlbee_shutdown, NULL ); |
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| 285 | |
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| 286 | first = 0; |
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| 287 | } |
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| 288 | else |
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| 289 | { |
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| 290 | /* Well, actually, for now we'll never need this part because this signal handler |
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| 291 | will never be called more than once in a session for a non-SIGPIPE signal... |
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| 292 | But just in case we decide to change that: */ |
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| 293 | |
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| 294 | log_message( LOGLVL_ERROR, "SIGTERM received twice, so long for a clean shutdown." ); |
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| 295 | raise( signal ); |
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| 296 | } |
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| 297 | } |
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| 298 | else if( signal == SIGCHLD ) |
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| 299 | { |
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| 300 | pid_t pid; |
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| 301 | int st; |
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| 302 | |
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| 303 | while( ( pid = waitpid( 0, &st, WNOHANG ) ) > 0 ) |
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| 304 | { |
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| 305 | if( WIFSIGNALED( st ) ) |
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| 306 | log_message( LOGLVL_INFO, "Client %d terminated normally. (status = %d)", (int) pid, WEXITSTATUS( st ) ); |
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| 307 | else if( WIFEXITED( st ) ) |
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| 308 | log_message( LOGLVL_INFO, "Client %d killed by signal %d.", (int) pid, WTERMSIG( st ) ); |
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| 309 | } |
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| 310 | } |
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| 311 | else if( signal != SIGPIPE ) |
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| 312 | { |
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| 313 | log_message( LOGLVL_ERROR, "Fatal signal received: %d. That's probably a bug.", signal ); |
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| 314 | raise( signal ); |
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| 315 | } |
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| 316 | } |
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| 317 | |
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| 318 | double gettime() |
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| 319 | { |
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| 320 | struct timeval time[1]; |
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| 321 | |
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| 322 | gettimeofday( time, 0 ); |
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| 323 | return( (double) time->tv_sec + (double) time->tv_usec / 1000000 ); |
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| 324 | } |
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