src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  *
  11  * Main program -- main()
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 static char UNUSED id[] = "$Id: ngircd.c,v 1.67 2002/12/26 16:25:43 alex Exp $";
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <signal.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <sys/wait.h>
  30 #include <time.h>
  31 #include <pwd.h>
  32 #include <grp.h>
  33
  34 #include "resolve.h"
  35 #include "conn.h"
  36 #include "client.h"
  37 #include "channel.h"
  38 #include "conf.h"
  39 #include "cvs-version.h"
  40 #include "defines.h"
  41 #include "lists.h"
  42 #include "log.h"
  43 #include "parse.h"
  44 #include "irc.h"
  45
  46 #include "exp.h"
  47 #include "ngircd.h"
  48
  49
  50 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
  51 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
  52
  53 LOCAL VOID Show_Version PARAMS(( VOID ));
  54 LOCAL VOID Show_Help PARAMS(( VOID ));
  55
  56
  57 GLOBAL int
  58 main( int argc, const char *argv[] )
  59 {
  60         struct passwd *pwd;
  61         struct group *grp;
  62         BOOLEAN ok, configtest = FALSE;
  63         LONG pid, n;
  64         INT i;
  65
  66         umask( 0077 );
  67
  68         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = FALSE;
  69         NGIRCd_NoDaemon = NGIRCd_Passive = FALSE;
  70 #ifdef DEBUG
  71         NGIRCd_Debug = FALSE;
  72 #endif
  73 #ifdef SNIFFER
  74         NGIRCd_Sniffer = FALSE;
  75 #endif
  76         strcpy( NGIRCd_ConfFile, SYSCONFDIR );
  77         strcat( NGIRCd_ConfFile, CONFIG_FILE );
  78
  79         /* Kommandozeile parsen */
  80         for( i = 1; i < argc; i++ )
  81         {
  82                 ok = FALSE;
  83                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
  84                 {
  85                         /* Lange Option */
  86
  87                         if( strcmp( argv[i], "--config" ) == 0 )
  88                         {
  89                                 if( i + 1 < argc )
  90                                 {
  91                                         /* Ok, there's an parameter left */
  92                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
  93
  94                                         /* next parameter */
  95                                         i++; ok = TRUE;
  96                                 }
  97                         }
  98                         if( strcmp( argv[i], "--configtest" ) == 0 )
  99                         {
 100                                 configtest = TRUE;
 101                                 ok = TRUE;
 102                         }
 103 #ifdef DEBUG
 104                         if( strcmp( argv[i], "--debug" ) == 0 )
 105                         {
 106                                 NGIRCd_Debug = TRUE;
 107                                 ok = TRUE;
 108                         }
 109 #endif
 110                         if( strcmp( argv[i], "--help" ) == 0 )
 111                         {
 112                                 Show_Version( );
 113                                 puts( "" ); Show_Help( ); puts( "" );
 114                                 exit( 1 );
 115                         }
 116                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 117                         {
 118                                 NGIRCd_NoDaemon = TRUE;
 119                                 ok = TRUE;
 120                         }
 121                         if( strcmp( argv[i], "--passive" ) == 0 )
 122                         {
 123                                 NGIRCd_Passive = TRUE;
 124                                 ok = TRUE;
 125                         }
 126 #ifdef SNIFFER
 127                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 128                         {
 129                                 NGIRCd_Sniffer = TRUE;
 130                                 ok = TRUE;
 131                         }
 132 #endif
 133                         if( strcmp( argv[i], "--version" ) == 0 )
 134                         {
 135                                 Show_Version( );
 136                                 exit( 1 );
 137                         }
 138                 }
 139                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 140                 {
 141                         /* Kurze Option */
 142
 143                         for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
 144                         {
 145                                 ok = FALSE;
 146 #ifdef DEBUG
 147                                 if( argv[i][n] == 'd' )
 148                                 {
 149                                         NGIRCd_Debug = TRUE;
 150                                         ok = TRUE;
 151                                 }
 152 #endif
 153                                 if( argv[i][n] == 'f' )
 154                                 {
 155                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 156                                         {
 157                                                 /* Ok, next character is a blank */
 158                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 159
 160                                                 /* go to the following parameter */
 161                                                 i++; n = (LONG)strlen( argv[i] );
 162                                                 ok = TRUE;
 163                                         }
 164                                 }
 165                                 if( argv[i][n] == 'n' )
 166                                 {
 167                                         NGIRCd_NoDaemon = TRUE;
 168                                         ok = TRUE;
 169                                 }
 170                                 if( argv[i][n] == 'p' )
 171                                 {
 172                                         NGIRCd_Passive = TRUE;
 173                                         ok = TRUE;
 174                                 }
 175 #ifdef SNIFFER
 176                                 if( argv[i][n] == 's' )
 177                                 {
 178                                         NGIRCd_Sniffer = TRUE;
 179                                         ok = TRUE;
 180                                 }
 181 #endif
 182
 183                                 if( ! ok )
 184                                 {
 185                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 186                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 187                                         exit( 1 );
 188                                 }
 189                         }
 190
 191                 }
 192                 if( ! ok )
 193                 {
 194                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 195                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 196                         exit( 1 );
 197                 }
 198         }
 199
 200         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 201         strcpy( NGIRCd_DebugLevel, "" );
 202 #ifdef DEBUG
 203         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 204 #endif
 205 #ifdef SNIFFER
 206         if( NGIRCd_Sniffer )
 207         {
 208                 NGIRCd_Debug = TRUE;
 209                 strcpy( NGIRCd_DebugLevel, "2" );
 210         }
 211 #endif
 212
 213         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 214         if( configtest )
 215         {
 216                 Show_Version( ); puts( "" );
 217                 exit( Conf_Test( ));
 218         }
 219
 220         while( ! NGIRCd_SignalQuit )
 221         {
 222                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 223                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 224                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 225                  * verhindert werden. */
 226                 if( ! NGIRCd_NoDaemon )
 227                 {
 228                         /* Daemon im Hintergrund erzeugen */
 229                         pid = (LONG)fork( );
 230                         if( pid > 0 )
 231                         {
 232                                 /* "alter" Prozess */
 233                                 exit( 0 );
 234                         }
 235                         if( pid < 0 )
 236                         {
 237                                 /* Fehler */
 238                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 239                                 exit( 1 );
 240                         }
 241
 242                         /* Child-Prozess initialisieren */
 243                         (VOID)setsid( );
 244                         chdir( "/" );
 245                 }
 246
 247                 /* Globale Variablen initialisieren */
 248                 NGIRCd_Start = time( NULL );
 249                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 250                 NGIRCd_SignalRehash = FALSE;
 251                 NGIRCd_SignalRestart = FALSE;
 252                 NGIRCd_SignalQuit = FALSE;
 253
 254                 /* Module initialisieren */
 255                 Log_Init( );
 256                 Resolve_Init( );
 257                 Conf_Init( );
 258                 Lists_Init( );
 259                 Channel_Init( );
 260                 Client_Init( );
 261                 Conn_Init( );
 262
 263                 /* Wenn als root ausgefuehrt und eine andere UID
 264                  * konfiguriert ist, jetzt zu dieser wechseln */
 265                 if( getuid( ) == 0 )
 266                 {
 267                         if( Conf_GID != 0 )
 268                         {
 269                                 /* Neue Group-ID setzen */
 270                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 271                         }
 272                         if( Conf_UID != 0 )
 273                         {
 274                                 /* Neue User-ID setzen */
 275                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 276                         }
 277                 }
 278
 279                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 280                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 281                 Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.", pwd ? pwd->pw_name : "unknown", (LONG)getuid( ), grp ? grp->gr_name : "unknown", (LONG)getgid( ), (LONG)getpid( ));
 282
 283                 /* stderr in "Error-File" umlenken */
 284                 Log_InitErrorfile( );
 285
 286                 /* Signal-Handler initialisieren */
 287                 Initialize_Signal_Handler( );
 288
 289                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 290                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 291                  * sind in doc/Protocol.txt beschrieben. */
 292 #ifdef IRCPLUS
 293                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 294 #ifdef USE_ZLIB
 295                 strcat( NGIRCd_ProtoID, "Z" );
 296 #endif
 297                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 298 #else
 299                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
 300 #endif
 301                 strcat( NGIRCd_ProtoID, " P" );
 302 #ifdef USE_ZLIB
 303                 strcat( NGIRCd_ProtoID, "Z" );
 304 #endif
 305                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 306
 307                 /* Vordefinierte Channels anlegen */
 308                 Channel_InitPredefined( );
 309
 310                 /* Listen-Ports initialisieren */
 311                 if( Conn_InitListeners( ) < 1 )
 312                 {
 313                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 314                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 315                         exit( 1 );
 316                 }
 317
 318                 /* Hauptschleife */
 319                 Conn_Handler( );
 320
 321                 /* Alles abmelden */
 322                 Conn_Exit( );
 323                 Client_Exit( );
 324                 Channel_Exit( );
 325                 Lists_Exit( );
 326                 Log_Exit( );
 327         }
 328
 329         return 0;
 330 } /* main */
 331
 332
 333 GLOBAL CHAR *
 334 NGIRCd_Version( VOID )
 335 {
 336         STATIC CHAR version[126];
 337
 338 #ifdef CVSDATE
 339         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 340 #else
 341         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 342 #endif
 343         return version;
 344 } /* NGIRCd_Version */
 345
 346
 347 GLOBAL CHAR *
 348 NGIRCd_VersionAddition( VOID )
 349 {
 350         STATIC CHAR txt[64];
 351
 352         strcpy( txt, "" );
 353
 354 #ifdef USE_SYSLOG
 355         if( txt[0] ) strcat( txt, "+" );
 356         strcat( txt, "SYSLOG" );
 357 #endif
 358 #ifdef USE_ZLIB
 359         if( txt[0] ) strcat( txt, "+" );
 360         strcat( txt, "ZLIB" );
 361 #endif
 362 #ifdef DEBUG
 363         if( txt[0] ) strcat( txt, "+" );
 364         strcat( txt, "DEBUG" );
 365 #endif
 366 #ifdef SNIFFER
 367         if( txt[0] ) strcat( txt, "+" );
 368         strcat( txt, "SNIFFER" );
 369 #endif
 370 #ifdef STRICT_RFC
 371         if( txt[0] ) strcat( txt, "+" );
 372         strcat( txt, "RFC" );
 373 #endif
 374 #ifdef IRCPLUS
 375         if( txt[0] ) strcat( txt, "+" );
 376         strcat( txt, "IRCPLUS" );
 377 #endif
 378
 379         if( txt[0] ) strcat( txt, "-" );
 380         strcat( txt, TARGET_CPU );
 381         strcat( txt, "/" );
 382         strcat( txt, TARGET_VENDOR );
 383         strcat( txt, "/" );
 384         strcat( txt, TARGET_OS );
 385
 386         return txt;
 387 } /* NGIRCd_VersionAddition */
 388
 389
 390 GLOBAL VOID
 391 NGIRCd_Rehash( VOID )
 392 {
 393         CHAR old_name[CLIENT_ID_LEN];
 394
 395         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 396         NGIRCd_SignalRehash = FALSE;
 397
 398         /* Alle Listen-Sockets schliessen */
 399         Conn_ExitListeners( );
 400
 401         /* Alten Server-Namen merken */
 402         strcpy( old_name, Conf_ServerName );
 403
 404         /* Konfiguration neu lesen ... */
 405         Conf_Init( );
 406
 407         /* Alten Server-Namen wiederherstellen: dieser
 408          * kann nicht zur Laufzeit geaendert werden ... */
 409         if( strcmp( old_name, Conf_ServerName ) != 0 )
 410         {
 411                 strcpy( Conf_ServerName, old_name );
 412                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 413         }
 414
 415         /* neue pre-defined Channel anlegen: */
 416         Channel_InitPredefined( );
 417
 418         /* Listen-Sockets neu anlegen: */
 419         Conn_InitListeners( );
 420
 421         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 422 } /* NGIRCd_Rehash */
 423
 424
 425 LOCAL VOID
 426 Initialize_Signal_Handler( VOID )
 427 {
 428         /* Signal-Handler initialisieren: einige Signale
 429          * werden ignoriert, andere speziell behandelt. */
 430
 431 #ifdef HAVE_SIGACTION
 432         /* sigaction() ist vorhanden */
 433
 434         struct sigaction saction;
 435
 436         /* Signal-Struktur initialisieren */
 437         memset( &saction, 0, sizeof( saction ));
 438         saction.sa_handler = Signal_Handler;
 439 #ifdef SA_RESTART
 440         saction.sa_flags |= SA_RESTART;
 441 #endif
 442 #ifdef SA_NOCLDWAIT
 443         saction.sa_flags |= SA_NOCLDWAIT;
 444 #endif
 445
 446         /* Signal-Handler einhaengen */
 447         sigaction( SIGINT, &saction, NULL );
 448         sigaction( SIGQUIT, &saction, NULL );
 449         sigaction( SIGTERM, &saction, NULL);
 450         sigaction( SIGHUP, &saction, NULL);
 451         sigaction( SIGCHLD, &saction, NULL);
 452
 453         /* einige Signale ignorieren */
 454         saction.sa_handler = SIG_IGN;
 455         sigaction( SIGPIPE, &saction, NULL );
 456 #else
 457         /* kein sigaction() vorhanden */
 458
 459         /* Signal-Handler einhaengen */
 460         signal( SIGINT, Signal_Handler );
 461         signal( SIGQUIT, Signal_Handler );
 462         signal( SIGTERM, Signal_Handler );
 463         signal( SIGHUP, Signal_Handler );
 464         signal( SIGCHLD, Signal_Handler );
 465
 466         /* einige Signale ignorieren */
 467         signal( SIGPIPE, SIG_IGN );
 468 #endif
 469 } /* Initialize_Signal_Handler */
 470
 471
 472 LOCAL VOID
 473 Signal_Handler( INT Signal )
 474 {
 475         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 476          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 477          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 478
 479         switch( Signal )
 480         {
 481                 case SIGTERM:
 482                 case SIGINT:
 483                 case SIGQUIT:
 484                         /* wir soll(t)en uns wohl beenden ... */
 485                         NGIRCd_SignalQuit = TRUE;
 486                         break;
 487                 case SIGHUP:
 488                         /* Konfiguration neu einlesen: */
 489                         NGIRCd_SignalRehash = TRUE;
 490                         break;
 491                 case SIGCHLD:
 492                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 493                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 494                         break;
 495 #ifdef DEBUG
 496                 default:
 497                         /* unbekanntes bzw. unbehandeltes Signal */
 498                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 499 #endif
 500         }
 501 } /* Signal_Handler */
 502
 503
 504 LOCAL VOID
 505 Show_Version( VOID )
 506 {
 507         puts( NGIRCd_Version( ));
 508         puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
 509         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 510         puts( "This is free software; see the source for copying conditions. There is NO" );
 511         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 512 } /* Show_Version */
 513
 514
 515 LOCAL VOID
 516 Show_Help( VOID )
 517 {
 518 #ifdef DEBUG
 519         puts( "  -d, --debug        log extra debug messages" );
 520 #endif
 521         puts( "  -f, --config <f>   use file <f> as configuration file" );
 522         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 523         puts( "  -p, --passive      disable automatic connections to other servers" );
 524 #ifdef SNIFFER
 525         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 526 #endif
 527         puts( "      --configtest   read, validate and display configuration; then exit" );
 528         puts( "      --version      output version information and exit" );
 529         puts( "      --help         display this help and exit" );
 530 } /* Show_Help */
 531
 532
 533 /* -eof- */