src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2005 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 1.87 2005/01/26 22:03:15 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 <time.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <pwd.h>
  32 #include <grp.h>
  33
  34 #include "defines.h"
  35 #include "resolve.h"
  36 #include "conn.h"
  37 #include "client.h"
  38 #include "channel.h"
  39 #include "conf.h"
  40 #include "cvs-version.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                                 if( argv[i][n] == 't' )
 187                                 {
 188                                         configtest = TRUE;
 189                                         ok = TRUE;
 190                                 }
 191
 192                                 if( ! ok )
 193                                 {
 194                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 195                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 196                                         exit( 1 );
 197                                 }
 198                         }
 199
 200                 }
 201                 if( ! ok )
 202                 {
 203                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 204                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 205                         exit( 1 );
 206                 }
 207         }
 208
 209         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 210         strcpy( NGIRCd_DebugLevel, "" );
 211 #ifdef DEBUG
 212         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 213 #endif
 214 #ifdef SNIFFER
 215         if( NGIRCd_Sniffer )
 216         {
 217                 NGIRCd_Debug = TRUE;
 218                 strcpy( NGIRCd_DebugLevel, "2" );
 219         }
 220 #endif
 221
 222         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 223         if( configtest )
 224         {
 225                 Show_Version( ); puts( "" );
 226                 exit( Conf_Test( ));
 227         }
 228
 229         while( ! NGIRCd_SignalQuit )
 230         {
 231                 /* Initialize global variables */
 232                 NGIRCd_Start = time( NULL );
 233                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 234
 235                 NGIRCd_SignalRehash = FALSE;
 236                 NGIRCd_SignalRestart = FALSE;
 237                 NGIRCd_SignalQuit = FALSE;
 238
 239                 /* Initialize modules, part I */
 240                 Log_Init( );
 241                 Conf_Init( );
 242
 243                 if( Conf_Chroot[0] )
 244                 {
 245                         /* Chroot */
 246                         if( chdir( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 247
 248                         if( chroot( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't change root directory to \"%s\": %s", Conf_Chroot, strerror( errno ));
 249                         else Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 250                 }
 251
 252                 if( Conf_GID != 0 )
 253                 {
 254                         /* Set new group ID */
 255                         if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 256                 }
 257                 if( Conf_UID != 0 )
 258                 {
 259                         /* Set new user ID */
 260                         if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
 261                 }
 262
 263                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 264                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 265                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 266                  * verhindert werden. */
 267                 if( ! NGIRCd_NoDaemon )
 268                 {
 269                         /* Daemon im Hintergrund erzeugen */
 270                         pid = (LONG)fork( );
 271                         if( pid > 0 )
 272                         {
 273                                 /* "alter" Prozess */
 274                                 exit( 0 );
 275                         }
 276                         if( pid < 0 )
 277                         {
 278                                 /* Fehler */
 279                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE_NAME, strerror( errno ));
 280                                 exit( 1 );
 281                         }
 282
 283                         /* Child-Prozess initialisieren */
 284                         (VOID)setsid( );
 285                         chdir( "/" );
 286                 }
 287
 288                 /* Show user, group, and PID of the running daemon */
 289                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 290                 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( ));
 291
 292                 /* Change working directory to home directory of the user
 293                  * we are running as (when not running chroot()'ed!) */
 294                 if( Conf_UID != 0 && ! Conf_Chroot[0] )
 295                 {
 296                         struct passwd *pwd;
 297
 298                         pwd = getpwuid( Conf_UID );
 299                         if( pwd != NULL )
 300                         {
 301                                 if( chdir( pwd->pw_dir ) == 0 ) Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 302                                 else Log( LOG_ERR, "Can't change working directory to \"%s\": %s", pwd->pw_dir, strerror( errno ));
 303                         }
 304                         else Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 305                 }
 306
 307                 /* Initialize modules, part II: these functions are eventually
 308                  * called with already dropped privileges ... */
 309                 Resolve_Init( );
 310                 Lists_Init( );
 311                 Channel_Init( );
 312                 Client_Init( );
 313 #ifdef RENDEZVOUS
 314                 Rendezvous_Init( );
 315 #endif
 316                 Conn_Init( );
 317
 318                 /* Redirect stderr handle to "error file" for debugging.
 319                  * But don't try to write in the chroot jail, since it's more
 320                  * secure to have a chroot dir not writable by the daemon.
 321                  */
 322                 if( ! Conf_Chroot[0] ) Log_InitErrorfile( );
 323
 324                 /* Signal-Handler initialisieren */
 325                 Initialize_Signal_Handler( );
 326
 327                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 328                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 329                  * sind in doc/Protocol.txt beschrieben. */
 330 #ifdef IRCPLUS
 331                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 332 #ifdef ZLIB
 333                 strcat( NGIRCd_ProtoID, "Z" );
 334 #endif
 335                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 336 #else
 337                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 338 #endif
 339                 strcat( NGIRCd_ProtoID, " P" );
 340 #ifdef ZLIB
 341                 strcat( NGIRCd_ProtoID, "Z" );
 342 #endif
 343                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 344
 345                 /* Vordefinierte Channels anlegen */
 346                 Channel_InitPredefined( );
 347
 348                 /* Listen-Ports initialisieren */
 349                 if( Conn_InitListeners( ) < 1 )
 350                 {
 351                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 352                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 353                         exit( 1 );
 354                 }
 355
 356                 /* Hauptschleife */
 357                 Conn_Handler( );
 358
 359                 /* Alles abmelden */
 360                 Conn_Exit( );
 361 #ifdef RENDEZVOUS
 362                 Rendezvous_Exit( );
 363 #endif
 364                 Client_Exit( );
 365                 Channel_Exit( );
 366                 Lists_Exit( );
 367                 Log_Exit( );
 368         }
 369
 370         return 0;
 371 } /* main */
 372
 373
 374 GLOBAL CHAR *
 375 NGIRCd_Version( VOID )
 376 {
 377         STATIC CHAR version[126];
 378
 379 #ifdef CVSDATE
 380         sprintf( version, "%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 381 #else
 382         sprintf( version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition( ));
 383 #endif
 384         return version;
 385 } /* NGIRCd_Version */
 386
 387
 388 GLOBAL CHAR *
 389 NGIRCd_VersionAddition( VOID )
 390 {
 391         STATIC CHAR txt[200];
 392
 393         strcpy( txt, "" );
 394
 395 #ifdef SYSLOG
 396         if( txt[0] ) strcat( txt, "+" );
 397         strcat( txt, "SYSLOG" );
 398 #endif
 399 #ifdef ZLIB
 400         if( txt[0] ) strcat( txt, "+" );
 401         strcat( txt, "ZLIB" );
 402 #endif
 403 #ifdef TCPWRAP
 404         if( txt[0] ) strcat( txt, "+" );
 405         strcat( txt, "TCPWRAP" );
 406 #endif
 407 #ifdef RENDEZVOUS
 408         if( txt[0] ) strcat( txt, "+" );
 409         strcat( txt, "RENDEZVOUS" );
 410 #endif
 411 #ifdef IDENTAUTH
 412         if( txt[0] ) strcat( txt, "+" );
 413         strcat( txt, "IDENT" );
 414 #endif
 415 #ifdef DEBUG
 416         if( txt[0] ) strcat( txt, "+" );
 417         strcat( txt, "DEBUG" );
 418 #endif
 419 #ifdef SNIFFER
 420         if( txt[0] ) strcat( txt, "+" );
 421         strcat( txt, "SNIFFER" );
 422 #endif
 423 #ifdef STRICT_RFC
 424         if( txt[0] ) strcat( txt, "+" );
 425         strcat( txt, "RFC" );
 426 #endif
 427 #ifdef IRCPLUS
 428         if( txt[0] ) strcat( txt, "+" );
 429         strcat( txt, "IRCPLUS" );
 430 #endif
 431
 432         if( txt[0] ) strlcat( txt, "-", sizeof( txt ));
 433         strlcat( txt, TARGET_CPU, sizeof( txt ));
 434         strlcat( txt, "/", sizeof( txt ));
 435         strlcat( txt, TARGET_VENDOR, sizeof( txt ));
 436         strlcat( txt, "/", sizeof( txt ));
 437         strlcat( txt, TARGET_OS, sizeof( txt ));
 438
 439         return txt;
 440 } /* NGIRCd_VersionAddition */
 441
 442
 443 GLOBAL VOID
 444 NGIRCd_Rehash( VOID )
 445 {
 446         CHAR old_name[CLIENT_ID_LEN];
 447
 448         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 449         NGIRCd_SignalRehash = FALSE;
 450
 451         /* Close down all listening sockets */
 452         Conn_ExitListeners( );
 453
 454         /* Remember old server name */
 455         strcpy( old_name, Conf_ServerName );
 456
 457         /* Re-read configuration ... */
 458         Conf_Rehash( );
 459
 460         /* Recover old server name: it can't be changed during run-time */
 461         if( strcmp( old_name, Conf_ServerName ) != 0 )
 462         {
 463                 strcpy( Conf_ServerName, old_name );
 464                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 465         }
 466
 467         /* Create new pre-defined channels */
 468         Channel_InitPredefined( );
 469
 470         /* Start listening on sockets */
 471         Conn_InitListeners( );
 472
 473         /* Sync configuration with established connections */
 474         Conn_SyncServerStruct( );
 475
 476         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 477 } /* NGIRCd_Rehash */
 478
 479
 480 LOCAL VOID
 481 Initialize_Signal_Handler( VOID )
 482 {
 483         /* Signal-Handler initialisieren: einige Signale
 484          * werden ignoriert, andere speziell behandelt. */
 485
 486 #ifdef HAVE_SIGACTION
 487         /* sigaction() ist vorhanden */
 488
 489         struct sigaction saction;
 490
 491         /* Signal-Struktur initialisieren */
 492         memset( &saction, 0, sizeof( saction ));
 493         saction.sa_handler = Signal_Handler;
 494 #ifdef SA_RESTART
 495         saction.sa_flags |= SA_RESTART;
 496 #endif
 497 #ifdef SA_NOCLDWAIT
 498         saction.sa_flags |= SA_NOCLDWAIT;
 499 #endif
 500
 501         /* Signal-Handler einhaengen */
 502         sigaction( SIGINT, &saction, NULL );
 503         sigaction( SIGQUIT, &saction, NULL );
 504         sigaction( SIGTERM, &saction, NULL);
 505         sigaction( SIGHUP, &saction, NULL);
 506         sigaction( SIGCHLD, &saction, NULL);
 507
 508         /* einige Signale ignorieren */
 509         saction.sa_handler = SIG_IGN;
 510         sigaction( SIGPIPE, &saction, NULL );
 511 #else
 512         /* kein sigaction() vorhanden */
 513
 514         /* Signal-Handler einhaengen */
 515         signal( SIGINT, Signal_Handler );
 516         signal( SIGQUIT, Signal_Handler );
 517         signal( SIGTERM, Signal_Handler );
 518         signal( SIGHUP, Signal_Handler );
 519         signal( SIGCHLD, Signal_Handler );
 520
 521         /* einige Signale ignorieren */
 522         signal( SIGPIPE, SIG_IGN );
 523 #endif
 524 } /* Initialize_Signal_Handler */
 525
 526
 527 LOCAL VOID
 528 Signal_Handler( INT Signal )
 529 {
 530         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 531          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 532          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 533
 534         switch( Signal )
 535         {
 536                 case SIGTERM:
 537                 case SIGINT:
 538                 case SIGQUIT:
 539                         /* wir soll(t)en uns wohl beenden ... */
 540                         NGIRCd_SignalQuit = TRUE;
 541                         break;
 542                 case SIGHUP:
 543                         /* Konfiguration neu einlesen: */
 544                         NGIRCd_SignalRehash = TRUE;
 545                         break;
 546                 case SIGCHLD:
 547                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 548                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 549                         break;
 550 #ifdef DEBUG
 551                 default:
 552                         /* unbekanntes bzw. unbehandeltes Signal */
 553                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 554 #endif
 555         }
 556 } /* Signal_Handler */
 557
 558
 559 LOCAL VOID
 560 Show_Version( VOID )
 561 {
 562         puts( NGIRCd_Version( ));
 563         puts( "Copyright (c)2001-2005 by Alexander Barton (<alex@barton.de>)." );
 564         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 565         puts( "This is free software; see the source for copying conditions. There is NO" );
 566         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 567 } /* Show_Version */
 568
 569
 570 LOCAL VOID
 571 Show_Help( VOID )
 572 {
 573 #ifdef DEBUG
 574         puts( "  -d, --debug        log extra debug messages" );
 575 #endif
 576         puts( "  -f, --config <f>   use file <f> as configuration file" );
 577         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 578         puts( "  -p, --passive      disable automatic connections to other servers" );
 579 #ifdef SNIFFER
 580         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 581 #endif
 582         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 583         puts( "      --version      output version information and exit" );
 584         puts( "      --help         display this help and exit" );
 585 } /* Show_Help */
 586
 587
 588 /* -eof- */