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