src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2003 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 1.72 2003/02/23 12:04:05 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 #ifdef RENDEZVOUS
  47 #include "rendezvous.h"
  48 #endif
  49
  50 #include "exp.h"
  51 #include "ngircd.h"
  52
  53
  54 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
  55 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
  56
  57 LOCAL VOID Show_Version PARAMS(( VOID ));
  58 LOCAL VOID Show_Help PARAMS(( VOID ));
  59
  60
  61 GLOBAL int
  62 main( int argc, const char *argv[] )
  63 {
  64         struct passwd *pwd;
  65         struct group *grp;
  66         BOOLEAN ok, configtest = FALSE;
  67         LONG pid, n;
  68         INT i;
  69
  70         umask( 0077 );
  71
  72         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = FALSE;
  73         NGIRCd_NoDaemon = NGIRCd_Passive = FALSE;
  74 #ifdef DEBUG
  75         NGIRCd_Debug = FALSE;
  76 #endif
  77 #ifdef SNIFFER
  78         NGIRCd_Sniffer = FALSE;
  79 #endif
  80         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
  81         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
  82
  83         /* Kommandozeile parsen */
  84         for( i = 1; i < argc; i++ )
  85         {
  86                 ok = FALSE;
  87                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
  88                 {
  89                         /* Lange Option */
  90
  91                         if( strcmp( argv[i], "--config" ) == 0 )
  92                         {
  93                                 if( i + 1 < argc )
  94                                 {
  95                                         /* Ok, there's an parameter left */
  96                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
  97
  98                                         /* next parameter */
  99                                         i++; ok = TRUE;
 100                                 }
 101                         }
 102                         if( strcmp( argv[i], "--configtest" ) == 0 )
 103                         {
 104                                 configtest = TRUE;
 105                                 ok = TRUE;
 106                         }
 107 #ifdef DEBUG
 108                         if( strcmp( argv[i], "--debug" ) == 0 )
 109                         {
 110                                 NGIRCd_Debug = TRUE;
 111                                 ok = TRUE;
 112                         }
 113 #endif
 114                         if( strcmp( argv[i], "--help" ) == 0 )
 115                         {
 116                                 Show_Version( );
 117                                 puts( "" ); Show_Help( ); puts( "" );
 118                                 exit( 1 );
 119                         }
 120                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 121                         {
 122                                 NGIRCd_NoDaemon = TRUE;
 123                                 ok = TRUE;
 124                         }
 125                         if( strcmp( argv[i], "--passive" ) == 0 )
 126                         {
 127                                 NGIRCd_Passive = TRUE;
 128                                 ok = TRUE;
 129                         }
 130 #ifdef SNIFFER
 131                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 132                         {
 133                                 NGIRCd_Sniffer = TRUE;
 134                                 ok = TRUE;
 135                         }
 136 #endif
 137                         if( strcmp( argv[i], "--version" ) == 0 )
 138                         {
 139                                 Show_Version( );
 140                                 exit( 1 );
 141                         }
 142                 }
 143                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 144                 {
 145                         /* Kurze Option */
 146
 147                         for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
 148                         {
 149                                 ok = FALSE;
 150 #ifdef DEBUG
 151                                 if( argv[i][n] == 'd' )
 152                                 {
 153                                         NGIRCd_Debug = TRUE;
 154                                         ok = TRUE;
 155                                 }
 156 #endif
 157                                 if( argv[i][n] == 'f' )
 158                                 {
 159                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 160                                         {
 161                                                 /* Ok, next character is a blank */
 162                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 163
 164                                                 /* go to the following parameter */
 165                                                 i++; n = (LONG)strlen( argv[i] );
 166                                                 ok = TRUE;
 167                                         }
 168                                 }
 169                                 if( argv[i][n] == 'n' )
 170                                 {
 171                                         NGIRCd_NoDaemon = TRUE;
 172                                         ok = TRUE;
 173                                 }
 174                                 if( argv[i][n] == 'p' )
 175                                 {
 176                                         NGIRCd_Passive = TRUE;
 177                                         ok = TRUE;
 178                                 }
 179 #ifdef SNIFFER
 180                                 if( argv[i][n] == 's' )
 181                                 {
 182                                         NGIRCd_Sniffer = TRUE;
 183                                         ok = TRUE;
 184                                 }
 185 #endif
 186
 187                                 if( ! ok )
 188                                 {
 189                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 190                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 191                                         exit( 1 );
 192                                 }
 193                         }
 194
 195                 }
 196                 if( ! ok )
 197                 {
 198                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 199                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 200                         exit( 1 );
 201                 }
 202         }
 203
 204         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 205         strcpy( NGIRCd_DebugLevel, "" );
 206 #ifdef DEBUG
 207         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 208 #endif
 209 #ifdef SNIFFER
 210         if( NGIRCd_Sniffer )
 211         {
 212                 NGIRCd_Debug = TRUE;
 213                 strcpy( NGIRCd_DebugLevel, "2" );
 214         }
 215 #endif
 216
 217         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 218         if( configtest )
 219         {
 220                 Show_Version( ); puts( "" );
 221                 exit( Conf_Test( ));
 222         }
 223
 224         while( ! NGIRCd_SignalQuit )
 225         {
 226                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 227                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 228                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 229                  * verhindert werden. */
 230                 if( ! NGIRCd_NoDaemon )
 231                 {
 232                         /* Daemon im Hintergrund erzeugen */
 233                         pid = (LONG)fork( );
 234                         if( pid > 0 )
 235                         {
 236                                 /* "alter" Prozess */
 237                                 exit( 0 );
 238                         }
 239                         if( pid < 0 )
 240                         {
 241                                 /* Fehler */
 242                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 243                                 exit( 1 );
 244                         }
 245
 246                         /* Child-Prozess initialisieren */
 247                         (VOID)setsid( );
 248                         chdir( "/" );
 249                 }
 250
 251                 /* Globale Variablen initialisieren */
 252                 NGIRCd_Start = time( NULL );
 253                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 254                 NGIRCd_SignalRehash = FALSE;
 255                 NGIRCd_SignalRestart = FALSE;
 256                 NGIRCd_SignalQuit = FALSE;
 257
 258                 /* Module initialisieren */
 259                 Log_Init( );
 260                 Resolve_Init( );
 261                 Conf_Init( );
 262                 Lists_Init( );
 263                 Channel_Init( );
 264                 Client_Init( );
 265 #ifdef RENDEZVOUS
 266                 Rendezvous_Init( );
 267 #endif
 268                 Conn_Init( );
 269
 270                 /* Wenn als root ausgefuehrt und eine andere UID
 271                  * konfiguriert ist, jetzt zu dieser wechseln */
 272                 if( getuid( ) == 0 )
 273                 {
 274                         if( Conf_GID != 0 )
 275                         {
 276                                 /* Neue Group-ID setzen */
 277                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 278                         }
 279                         if( Conf_UID != 0 )
 280                         {
 281                                 /* Neue User-ID setzen */
 282                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 283                         }
 284                 }
 285
 286                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 287                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 288                 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( ));
 289
 290                 /* stderr in "Error-File" umlenken */
 291                 Log_InitErrorfile( );
 292
 293                 /* Signal-Handler initialisieren */
 294                 Initialize_Signal_Handler( );
 295
 296                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 297                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 298                  * sind in doc/Protocol.txt beschrieben. */
 299 #ifdef IRCPLUS
 300                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 301 #ifdef USE_ZLIB
 302                 strcat( NGIRCd_ProtoID, "Z" );
 303 #endif
 304                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 305 #else
 306                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
 307 #endif
 308                 strcat( NGIRCd_ProtoID, " P" );
 309 #ifdef USE_ZLIB
 310                 strcat( NGIRCd_ProtoID, "Z" );
 311 #endif
 312                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 313
 314                 /* Vordefinierte Channels anlegen */
 315                 Channel_InitPredefined( );
 316
 317                 /* Listen-Ports initialisieren */
 318                 if( Conn_InitListeners( ) < 1 )
 319                 {
 320                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 321                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 322                         exit( 1 );
 323                 }
 324
 325                 /* Hauptschleife */
 326                 Conn_Handler( );
 327
 328                 /* Alles abmelden */
 329                 Conn_Exit( );
 330 #ifdef RENDEZVOUS
 331                 Rendezvous_Exit( );
 332 #endif
 333                 Client_Exit( );
 334                 Channel_Exit( );
 335                 Lists_Exit( );
 336                 Log_Exit( );
 337         }
 338
 339         return 0;
 340 } /* main */
 341
 342
 343 GLOBAL CHAR *
 344 NGIRCd_Version( VOID )
 345 {
 346         STATIC CHAR version[126];
 347
 348 #ifdef CVSDATE
 349         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 350 #else
 351         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 352 #endif
 353         return version;
 354 } /* NGIRCd_Version */
 355
 356
 357 GLOBAL CHAR *
 358 NGIRCd_VersionAddition( VOID )
 359 {
 360         STATIC CHAR txt[64];
 361
 362         strcpy( txt, "" );
 363
 364 #ifdef USE_SYSLOG
 365         if( txt[0] ) strcat( txt, "+" );
 366         strcat( txt, "SYSLOG" );
 367 #endif
 368 #ifdef USE_ZLIB
 369         if( txt[0] ) strcat( txt, "+" );
 370         strcat( txt, "ZLIB" );
 371 #endif
 372 #ifdef DEBUG
 373         if( txt[0] ) strcat( txt, "+" );
 374         strcat( txt, "DEBUG" );
 375 #endif
 376 #ifdef SNIFFER
 377         if( txt[0] ) strcat( txt, "+" );
 378         strcat( txt, "SNIFFER" );
 379 #endif
 380 #ifdef STRICT_RFC
 381         if( txt[0] ) strcat( txt, "+" );
 382         strcat( txt, "RFC" );
 383 #endif
 384 #ifdef IRCPLUS
 385         if( txt[0] ) strcat( txt, "+" );
 386         strcat( txt, "IRCPLUS" );
 387 #endif
 388 #ifdef RENDEZVOUS
 389         if( txt[0] ) strcat( txt, "+" );
 390         strcat( txt, "RENDEZVOUS" );
 391 #endif
 392
 393         if( txt[0] ) strlcat( txt, "-", sizeof( txt ));
 394         strlcat( txt, TARGET_CPU, sizeof( txt ));
 395         strlcat( txt, "/", sizeof( txt ));
 396         strlcat( txt, TARGET_VENDOR, sizeof( txt ));
 397         strlcat( txt, "/", sizeof( txt ));
 398         strlcat( txt, TARGET_OS, sizeof( txt ));
 399
 400         return txt;
 401 } /* NGIRCd_VersionAddition */
 402
 403
 404 GLOBAL VOID
 405 NGIRCd_Rehash( VOID )
 406 {
 407         CHAR old_name[CLIENT_ID_LEN];
 408
 409         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 410         NGIRCd_SignalRehash = FALSE;
 411
 412         /* Alle Listen-Sockets schliessen */
 413         Conn_ExitListeners( );
 414
 415         /* Alten Server-Namen merken */
 416         assert( sizeof( old_name ) == sizeof( Conf_ServerName ));
 417         strcpy( old_name, Conf_ServerName );
 418
 419         /* Konfiguration neu lesen ... */
 420         Conf_Rehash( );
 421
 422         /* Alten Server-Namen wiederherstellen: dieser
 423          * kann nicht zur Laufzeit geaendert werden ... */
 424         if( strcmp( old_name, Conf_ServerName ) != 0 )
 425         {
 426                 strcpy( Conf_ServerName, old_name );
 427                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 428         }
 429
 430         /* neue pre-defined Channel anlegen: */
 431         Channel_InitPredefined( );
 432
 433         /* Listen-Sockets neu anlegen: */
 434         Conn_InitListeners( );
 435
 436         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 437 } /* NGIRCd_Rehash */
 438
 439
 440 LOCAL VOID
 441 Initialize_Signal_Handler( VOID )
 442 {
 443         /* Signal-Handler initialisieren: einige Signale
 444          * werden ignoriert, andere speziell behandelt. */
 445
 446 #ifdef HAVE_SIGACTION
 447         /* sigaction() ist vorhanden */
 448
 449         struct sigaction saction;
 450
 451         /* Signal-Struktur initialisieren */
 452         memset( &saction, 0, sizeof( saction ));
 453         saction.sa_handler = Signal_Handler;
 454 #ifdef SA_RESTART
 455         saction.sa_flags |= SA_RESTART;
 456 #endif
 457 #ifdef SA_NOCLDWAIT
 458         saction.sa_flags |= SA_NOCLDWAIT;
 459 #endif
 460
 461         /* Signal-Handler einhaengen */
 462         sigaction( SIGINT, &saction, NULL );
 463         sigaction( SIGQUIT, &saction, NULL );
 464         sigaction( SIGTERM, &saction, NULL);
 465         sigaction( SIGHUP, &saction, NULL);
 466         sigaction( SIGCHLD, &saction, NULL);
 467
 468         /* einige Signale ignorieren */
 469         saction.sa_handler = SIG_IGN;
 470         sigaction( SIGPIPE, &saction, NULL );
 471 #else
 472         /* kein sigaction() vorhanden */
 473
 474         /* Signal-Handler einhaengen */
 475         signal( SIGINT, Signal_Handler );
 476         signal( SIGQUIT, Signal_Handler );
 477         signal( SIGTERM, Signal_Handler );
 478         signal( SIGHUP, Signal_Handler );
 479         signal( SIGCHLD, Signal_Handler );
 480
 481         /* einige Signale ignorieren */
 482         signal( SIGPIPE, SIG_IGN );
 483 #endif
 484 } /* Initialize_Signal_Handler */
 485
 486
 487 LOCAL VOID
 488 Signal_Handler( INT Signal )
 489 {
 490         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 491          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 492          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 493
 494         switch( Signal )
 495         {
 496                 case SIGTERM:
 497                 case SIGINT:
 498                 case SIGQUIT:
 499                         /* wir soll(t)en uns wohl beenden ... */
 500                         NGIRCd_SignalQuit = TRUE;
 501                         break;
 502                 case SIGHUP:
 503                         /* Konfiguration neu einlesen: */
 504                         NGIRCd_SignalRehash = TRUE;
 505                         break;
 506                 case SIGCHLD:
 507                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 508                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 509                         break;
 510 #ifdef DEBUG
 511                 default:
 512                         /* unbekanntes bzw. unbehandeltes Signal */
 513                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 514 #endif
 515         }
 516 } /* Signal_Handler */
 517
 518
 519 LOCAL VOID
 520 Show_Version( VOID )
 521 {
 522         puts( NGIRCd_Version( ));
 523         puts( "Copyright (c)2001-2003 by Alexander Barton (<alex@barton.de>)." );
 524         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 525         puts( "This is free software; see the source for copying conditions. There is NO" );
 526         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 527 } /* Show_Version */
 528
 529
 530 LOCAL VOID
 531 Show_Help( VOID )
 532 {
 533 #ifdef DEBUG
 534         puts( "  -d, --debug        log extra debug messages" );
 535 #endif
 536         puts( "  -f, --config <f>   use file <f> as configuration file" );
 537         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 538         puts( "  -p, --passive      disable automatic connections to other servers" );
 539 #ifdef SNIFFER
 540         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 541 #endif
 542         puts( "      --configtest   read, validate and display configuration; then exit" );
 543         puts( "      --version      output version information and exit" );
 544         puts( "      --help         display this help and exit" );
 545 } /* Show_Help */
 546
 547
 548 /* -eof- */