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 1.65 2002/12/19 04:29:59 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, CONFIG_FILE );
  77
  78         /* Kommandozeile parsen */
  79         for( i = 1; i < argc; i++ )
  80         {
  81                 ok = FALSE;
  82                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
  83                 {
  84                         /* Lange Option */
  85
  86                         if( strcmp( argv[i], "--config" ) == 0 )
  87                         {
  88                                 if( i + 1 < argc )
  89                                 {
  90                                         /* Ok, danach kommt noch ein Parameter */
  91                                         strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
  92                                         NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
  93
  94                                         /* zum uebernaechsten 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, danach kommt ein Leerzeichen */
 158                                                 strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
 159                                                 NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
 160
 161                                                 /* zum uebernaechsten Parameter */
 162                                                 i++; n = (LONG)strlen( argv[i] );
 163                                                 ok = TRUE;
 164                                         }
 165                                 }
 166                                 if( argv[i][n] == 'n' )
 167                                 {
 168                                         NGIRCd_NoDaemon = TRUE;
 169                                         ok = TRUE;
 170                                 }
 171                                 if( argv[i][n] == 'p' )
 172                                 {
 173                                         NGIRCd_Passive = TRUE;
 174                                         ok = TRUE;
 175                                 }
 176 #ifdef SNIFFER
 177                                 if( argv[i][n] == 's' )
 178                                 {
 179                                         NGIRCd_Sniffer = TRUE;
 180                                         ok = TRUE;
 181                                 }
 182 #endif
 183
 184                                 if( ! ok )
 185                                 {
 186                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 187                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 188                                         exit( 1 );
 189                                 }
 190                         }
 191
 192                 }
 193                 if( ! ok )
 194                 {
 195                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 196                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 197                         exit( 1 );
 198                 }
 199         }
 200
 201         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 202         strcpy( NGIRCd_DebugLevel, "" );
 203 #ifdef DEBUG
 204         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 205 #endif
 206 #ifdef SNIFFER
 207         if( NGIRCd_Sniffer )
 208         {
 209                 NGIRCd_Debug = TRUE;
 210                 strcpy( NGIRCd_DebugLevel, "2" );
 211         }
 212 #endif
 213
 214         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 215         if( configtest )
 216         {
 217                 Show_Version( ); puts( "" );
 218                 exit( Conf_Test( ));
 219         }
 220
 221         while( ! NGIRCd_SignalQuit )
 222         {
 223                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 224                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 225                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 226                  * verhindert werden. */
 227                 if( ! NGIRCd_NoDaemon )
 228                 {
 229                         /* Daemon im Hintergrund erzeugen */
 230                         pid = (LONG)fork( );
 231                         if( pid > 0 )
 232                         {
 233                                 /* "alter" Prozess */
 234                                 exit( 0 );
 235                         }
 236                         if( pid < 0 )
 237                         {
 238                                 /* Fehler */
 239                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 240                                 exit( 1 );
 241                         }
 242
 243                         /* Child-Prozess initialisieren */
 244                         (VOID)setsid( );
 245                         chdir( "/" );
 246                 }
 247
 248                 /* Globale Variablen initialisieren */
 249                 NGIRCd_Start = time( NULL );
 250                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 251                 NGIRCd_SignalRehash = FALSE;
 252                 NGIRCd_SignalRestart = FALSE;
 253                 NGIRCd_SignalQuit = FALSE;
 254
 255                 /* Module initialisieren */
 256                 Log_Init( );
 257                 Resolve_Init( );
 258                 Conf_Init( );
 259                 Lists_Init( );
 260                 Channel_Init( );
 261                 Client_Init( );
 262                 Conn_Init( );
 263
 264                 /* Wenn als root ausgefuehrt und eine andere UID
 265                  * konfiguriert ist, jetzt zu dieser wechseln */
 266                 if( getuid( ) == 0 )
 267                 {
 268                         if( Conf_GID != 0 )
 269                         {
 270                                 /* Neue Group-ID setzen */
 271                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 272                         }
 273                         if( Conf_UID != 0 )
 274                         {
 275                                 /* Neue User-ID setzen */
 276                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 277                         }
 278                 }
 279
 280                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 281                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 282                 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( ));
 283
 284                 /* stderr in "Error-File" umlenken */
 285                 Log_InitErrorfile( );
 286
 287                 /* Signal-Handler initialisieren */
 288                 Initialize_Signal_Handler( );
 289
 290                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 291                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 292                  * sind in doc/Protocol.txt beschrieben. */
 293 #ifdef IRCPLUS
 294                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 295 #ifdef USE_ZLIB
 296                 strcat( NGIRCd_ProtoID, "Z" );
 297 #endif
 298                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 299 #else
 300                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
 301 #endif
 302                 strcat( NGIRCd_ProtoID, " P" );
 303 #ifdef USE_ZLIB
 304                 strcat( NGIRCd_ProtoID, "Z" );
 305 #endif
 306                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 307
 308                 /* Vordefinierte Channels anlegen */
 309                 Channel_InitPredefined( );
 310
 311                 /* Listen-Ports initialisieren */
 312                 if( Conn_InitListeners( ) < 1 )
 313                 {
 314                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 315                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 316                         exit( 1 );
 317                 }
 318
 319                 /* Hauptschleife */
 320                 Conn_Handler( );
 321
 322                 /* Alles abmelden */
 323                 Conn_Exit( );
 324                 Client_Exit( );
 325                 Channel_Exit( );
 326                 Lists_Exit( );
 327                 Log_Exit( );
 328         }
 329
 330         return 0;
 331 } /* main */
 332
 333
 334 GLOBAL CHAR *
 335 NGIRCd_Version( VOID )
 336 {
 337         STATIC CHAR version[126];
 338
 339 #ifdef CVSDATE
 340         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 341 #else
 342         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 343 #endif
 344         return version;
 345 } /* NGIRCd_Version */
 346
 347
 348 GLOBAL CHAR *
 349 NGIRCd_VersionAddition( VOID )
 350 {
 351         STATIC CHAR txt[64];
 352
 353         strcpy( txt, "" );
 354
 355 #ifdef USE_SYSLOG
 356         if( txt[0] ) strcat( txt, "+" );
 357         strcat( txt, "SYSLOG" );
 358 #endif
 359 #ifdef USE_ZLIB
 360         if( txt[0] ) strcat( txt, "+" );
 361         strcat( txt, "ZLIB" );
 362 #endif
 363 #ifdef DEBUG
 364         if( txt[0] ) strcat( txt, "+" );
 365         strcat( txt, "DEBUG" );
 366 #endif
 367 #ifdef SNIFFER
 368         if( txt[0] ) strcat( txt, "+" );
 369         strcat( txt, "SNIFFER" );
 370 #endif
 371 #ifdef STRICT_RFC
 372         if( txt[0] ) strcat( txt, "+" );
 373         strcat( txt, "RFC" );
 374 #endif
 375 #ifdef IRCPLUS
 376         if( txt[0] ) strcat( txt, "+" );
 377         strcat( txt, "IRCPLUS" );
 378 #endif
 379
 380         if( txt[0] ) strcat( txt, "-" );
 381         strcat( txt, TARGET_CPU );
 382         strcat( txt, "/" );
 383         strcat( txt, TARGET_VENDOR );
 384         strcat( txt, "/" );
 385         strcat( txt, TARGET_OS );
 386
 387         return txt;
 388 } /* NGIRCd_VersionAddition */
 389
 390
 391 GLOBAL VOID
 392 NGIRCd_Rehash( VOID )
 393 {
 394         CHAR old_name[CLIENT_ID_LEN];
 395
 396         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 397         NGIRCd_SignalRehash = FALSE;
 398
 399         /* Alle Listen-Sockets schliessen */
 400         Conn_ExitListeners( );
 401
 402         /* Alten Server-Namen merken */
 403         strcpy( old_name, Conf_ServerName );
 404
 405         /* Konfiguration neu lesen ... */
 406         Conf_Init( );
 407
 408         /* Alten Server-Namen wiederherstellen: dieser
 409          * kann nicht zur Laufzeit geaendert werden ... */
 410         if( strcmp( old_name, Conf_ServerName ) != 0 )
 411         {
 412                 strcpy( Conf_ServerName, old_name );
 413                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 414         }
 415
 416         /* neue pre-defined Channel anlegen: */
 417         Channel_InitPredefined( );
 418
 419         /* Listen-Sockets neu anlegen: */
 420         Conn_InitListeners( );
 421
 422         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 423 } /* NGIRCd_Rehash */
 424
 425
 426 LOCAL VOID
 427 Initialize_Signal_Handler( VOID )
 428 {
 429         /* Signal-Handler initialisieren: einige Signale
 430          * werden ignoriert, andere speziell behandelt. */
 431
 432 #ifdef HAVE_SIGACTION
 433         /* sigaction() ist vorhanden */
 434
 435         struct sigaction saction;
 436
 437         /* Signal-Struktur initialisieren */
 438         memset( &saction, 0, sizeof( saction ));
 439         saction.sa_handler = Signal_Handler;
 440 #ifdef SA_RESTART
 441         saction.sa_flags |= SA_RESTART;
 442 #endif
 443 #ifdef SA_NOCLDWAIT
 444         saction.sa_flags |= SA_NOCLDWAIT;
 445 #endif
 446
 447         /* Signal-Handler einhaengen */
 448         sigaction( SIGINT, &saction, NULL );
 449         sigaction( SIGQUIT, &saction, NULL );
 450         sigaction( SIGTERM, &saction, NULL);
 451         sigaction( SIGHUP, &saction, NULL);
 452         sigaction( SIGCHLD, &saction, NULL);
 453
 454         /* einige Signale ignorieren */
 455         saction.sa_handler = SIG_IGN;
 456         sigaction( SIGPIPE, &saction, NULL );
 457 #else
 458         /* kein sigaction() vorhanden */
 459
 460         /* Signal-Handler einhaengen */
 461         signal( SIGINT, Signal_Handler );
 462         signal( SIGQUIT, Signal_Handler );
 463         signal( SIGTERM, Signal_Handler );
 464         signal( SIGHUP, Signal_Handler );
 465         signal( SIGCHLD, Signal_Handler );
 466
 467         /* einige Signale ignorieren */
 468         signal( SIGPIPE, SIG_IGN );
 469 #endif
 470 } /* Initialize_Signal_Handler */
 471
 472
 473 LOCAL VOID
 474 Signal_Handler( INT Signal )
 475 {
 476         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 477          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 478          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 479
 480         switch( Signal )
 481         {
 482                 case SIGTERM:
 483                 case SIGINT:
 484                 case SIGQUIT:
 485                         /* wir soll(t)en uns wohl beenden ... */
 486                         NGIRCd_SignalQuit = TRUE;
 487                         break;
 488                 case SIGHUP:
 489                         /* Konfiguration neu einlesen: */
 490                         NGIRCd_SignalRehash = TRUE;
 491                         break;
 492                 case SIGCHLD:
 493                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 494                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 495                         break;
 496 #ifdef DEBUG
 497                 default:
 498                         /* unbekanntes bzw. unbehandeltes Signal */
 499                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 500 #endif
 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- */