src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2004 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 1.81 2004/01/02 19:23:30 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                                 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                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 232                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 233                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 234                  * verhindert werden. */
 235                 if( ! NGIRCd_NoDaemon )
 236                 {
 237                         /* Daemon im Hintergrund erzeugen */
 238                         pid = (LONG)fork( );
 239                         if( pid > 0 )
 240                         {
 241                                 /* "alter" Prozess */
 242                                 exit( 0 );
 243                         }
 244                         if( pid < 0 )
 245                         {
 246                                 /* Fehler */
 247                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE_NAME, strerror( errno ));
 248                                 exit( 1 );
 249                         }
 250
 251                         /* Child-Prozess initialisieren */
 252                         (VOID)setsid( );
 253                         chdir( "/" );
 254                 }
 255
 256                 /* Globale Variablen initialisieren */
 257                 NGIRCd_Start = time( NULL );
 258                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 259                 NGIRCd_SignalRehash = FALSE;
 260                 NGIRCd_SignalRestart = FALSE;
 261                 NGIRCd_SignalQuit = FALSE;
 262
 263                 /* Module initialisieren */
 264                 Log_Init( );
 265                 Resolve_Init( );
 266                 Conf_Init( );
 267                 Lists_Init( );
 268                 Channel_Init( );
 269                 Client_Init( );
 270 #ifdef RENDEZVOUS
 271                 Rendezvous_Init( );
 272 #endif
 273                 Conn_Init( );
 274
 275                 /* Wenn als root ausgefuehrt und eine andere UID
 276                  * konfiguriert ist, jetzt zu dieser wechseln */
 277                 if( getuid( ) == 0 )
 278                 {
 279                         if( Conf_GID != 0 )
 280                         {
 281                                 /* Neue Group-ID setzen */
 282                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 283                         }
 284                         if( Conf_UID != 0 )
 285                         {
 286                                 /* Neue User-ID setzen */
 287                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 288                         }
 289                 }
 290
 291                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 292                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 293                 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( ));
 294
 295                 /* stderr in "Error-File" umlenken */
 296                 Log_InitErrorfile( );
 297
 298                 /* Signal-Handler initialisieren */
 299                 Initialize_Signal_Handler( );
 300
 301                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 302                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 303                  * sind in doc/Protocol.txt beschrieben. */
 304 #ifdef IRCPLUS
 305                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 306 #ifdef ZLIB
 307                 strcat( NGIRCd_ProtoID, "Z" );
 308 #endif
 309                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 310 #else
 311                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 312 #endif
 313                 strcat( NGIRCd_ProtoID, " P" );
 314 #ifdef ZLIB
 315                 strcat( NGIRCd_ProtoID, "Z" );
 316 #endif
 317                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 318
 319                 /* Vordefinierte Channels anlegen */
 320                 Channel_InitPredefined( );
 321
 322                 /* Listen-Ports initialisieren */
 323                 if( Conn_InitListeners( ) < 1 )
 324                 {
 325                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 326                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 327                         exit( 1 );
 328                 }
 329
 330                 /* Hauptschleife */
 331                 Conn_Handler( );
 332
 333                 /* Alles abmelden */
 334                 Conn_Exit( );
 335 #ifdef RENDEZVOUS
 336                 Rendezvous_Exit( );
 337 #endif
 338                 Client_Exit( );
 339                 Channel_Exit( );
 340                 Lists_Exit( );
 341                 Log_Exit( );
 342         }
 343
 344         return 0;
 345 } /* main */
 346
 347
 348 GLOBAL CHAR *
 349 NGIRCd_Version( VOID )
 350 {
 351         STATIC CHAR version[126];
 352
 353 #ifdef CVSDATE
 354         sprintf( version, "%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 355 #else
 356         sprintf( version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition( ));
 357 #endif
 358         return version;
 359 } /* NGIRCd_Version */
 360
 361
 362 GLOBAL CHAR *
 363 NGIRCd_VersionAddition( VOID )
 364 {
 365         STATIC CHAR txt[200];
 366
 367         strcpy( txt, "" );
 368
 369 #ifdef SYSLOG
 370         if( txt[0] ) strcat( txt, "+" );
 371         strcat( txt, "SYSLOG" );
 372 #endif
 373 #ifdef ZLIB
 374         if( txt[0] ) strcat( txt, "+" );
 375         strcat( txt, "ZLIB" );
 376 #endif
 377 #ifdef TCPWRAP
 378         if( txt[0] ) strcat( txt, "+" );
 379         strcat( txt, "TCPWRAP" );
 380 #endif
 381 #ifdef RENDEZVOUS
 382         if( txt[0] ) strcat( txt, "+" );
 383         strcat( txt, "RENDEZVOUS" );
 384 #endif
 385 #ifdef IDENTAUTH
 386         if( txt[0] ) strcat( txt, "+" );
 387         strcat( txt, "IDENT" );
 388 #endif
 389 #ifdef DEBUG
 390         if( txt[0] ) strcat( txt, "+" );
 391         strcat( txt, "DEBUG" );
 392 #endif
 393 #ifdef SNIFFER
 394         if( txt[0] ) strcat( txt, "+" );
 395         strcat( txt, "SNIFFER" );
 396 #endif
 397 #ifdef STRICT_RFC
 398         if( txt[0] ) strcat( txt, "+" );
 399         strcat( txt, "RFC" );
 400 #endif
 401 #ifdef IRCPLUS
 402         if( txt[0] ) strcat( txt, "+" );
 403         strcat( txt, "IRCPLUS" );
 404 #endif
 405
 406         if( txt[0] ) strlcat( txt, "-", sizeof( txt ));
 407         strlcat( txt, TARGET_CPU, sizeof( txt ));
 408         strlcat( txt, "/", sizeof( txt ));
 409         strlcat( txt, TARGET_VENDOR, sizeof( txt ));
 410         strlcat( txt, "/", sizeof( txt ));
 411         strlcat( txt, TARGET_OS, sizeof( txt ));
 412
 413         return txt;
 414 } /* NGIRCd_VersionAddition */
 415
 416
 417 GLOBAL VOID
 418 NGIRCd_Rehash( VOID )
 419 {
 420         CHAR old_name[CLIENT_ID_LEN];
 421
 422         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 423         NGIRCd_SignalRehash = FALSE;
 424
 425         /* Alle Listen-Sockets schliessen */
 426         Conn_ExitListeners( );
 427
 428         /* Alten Server-Namen merken */
 429 #ifdef DEBUG
 430         assert( sizeof( old_name ) == sizeof( Conf_ServerName ));
 431 #endif
 432         strcpy( old_name, Conf_ServerName );
 433
 434         /* Konfiguration neu lesen ... */
 435         Conf_Rehash( );
 436
 437         /* Alten Server-Namen wiederherstellen: dieser
 438          * kann nicht zur Laufzeit geaendert werden ... */
 439         if( strcmp( old_name, Conf_ServerName ) != 0 )
 440         {
 441                 strcpy( Conf_ServerName, old_name );
 442                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 443         }
 444
 445         /* neue pre-defined Channel anlegen: */
 446         Channel_InitPredefined( );
 447
 448         /* Listen-Sockets neu anlegen: */
 449         Conn_InitListeners( );
 450
 451         /* Sync configuration with established connections */
 452         Conn_SyncServerStruct( );
 453
 454         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 455 } /* NGIRCd_Rehash */
 456
 457
 458 LOCAL VOID
 459 Initialize_Signal_Handler( VOID )
 460 {
 461         /* Signal-Handler initialisieren: einige Signale
 462          * werden ignoriert, andere speziell behandelt. */
 463
 464 #ifdef HAVE_SIGACTION
 465         /* sigaction() ist vorhanden */
 466
 467         struct sigaction saction;
 468
 469         /* Signal-Struktur initialisieren */
 470         memset( &saction, 0, sizeof( saction ));
 471         saction.sa_handler = Signal_Handler;
 472 #ifdef SA_RESTART
 473         saction.sa_flags |= SA_RESTART;
 474 #endif
 475 #ifdef SA_NOCLDWAIT
 476         saction.sa_flags |= SA_NOCLDWAIT;
 477 #endif
 478
 479         /* Signal-Handler einhaengen */
 480         sigaction( SIGINT, &saction, NULL );
 481         sigaction( SIGQUIT, &saction, NULL );
 482         sigaction( SIGTERM, &saction, NULL);
 483         sigaction( SIGHUP, &saction, NULL);
 484         sigaction( SIGCHLD, &saction, NULL);
 485
 486         /* einige Signale ignorieren */
 487         saction.sa_handler = SIG_IGN;
 488         sigaction( SIGPIPE, &saction, NULL );
 489 #else
 490         /* kein sigaction() vorhanden */
 491
 492         /* Signal-Handler einhaengen */
 493         signal( SIGINT, Signal_Handler );
 494         signal( SIGQUIT, Signal_Handler );
 495         signal( SIGTERM, Signal_Handler );
 496         signal( SIGHUP, Signal_Handler );
 497         signal( SIGCHLD, Signal_Handler );
 498
 499         /* einige Signale ignorieren */
 500         signal( SIGPIPE, SIG_IGN );
 501 #endif
 502 } /* Initialize_Signal_Handler */
 503
 504
 505 LOCAL VOID
 506 Signal_Handler( INT Signal )
 507 {
 508         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 509          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 510          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 511
 512         switch( Signal )
 513         {
 514                 case SIGTERM:
 515                 case SIGINT:
 516                 case SIGQUIT:
 517                         /* wir soll(t)en uns wohl beenden ... */
 518                         NGIRCd_SignalQuit = TRUE;
 519                         break;
 520                 case SIGHUP:
 521                         /* Konfiguration neu einlesen: */
 522                         NGIRCd_SignalRehash = TRUE;
 523                         break;
 524                 case SIGCHLD:
 525                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 526                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 527                         break;
 528 #ifdef DEBUG
 529                 default:
 530                         /* unbekanntes bzw. unbehandeltes Signal */
 531                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 532 #endif
 533         }
 534 } /* Signal_Handler */
 535
 536
 537 LOCAL VOID
 538 Show_Version( VOID )
 539 {
 540         puts( NGIRCd_Version( ));
 541         puts( "Copyright (c)2001-2004 by Alexander Barton (<alex@barton.de>)." );
 542         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 543         puts( "This is free software; see the source for copying conditions. There is NO" );
 544         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 545 } /* Show_Version */
 546
 547
 548 LOCAL VOID
 549 Show_Help( VOID )
 550 {
 551 #ifdef DEBUG
 552         puts( "  -d, --debug        log extra debug messages" );
 553 #endif
 554         puts( "  -f, --config <f>   use file <f> as configuration file" );
 555         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 556         puts( "  -p, --passive      disable automatic connections to other servers" );
 557 #ifdef SNIFFER
 558         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 559 #endif
 560         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 561         puts( "      --version      output version information and exit" );
 562         puts( "      --help         display this help and exit" );
 563 } /* Show_Help */
 564
 565
 566 /* -eof- */