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  * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
   6  * der GNU General Public License (GPL), wie von der Free Software Foundation
   7  * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
   8  * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
   9  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
  10  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
  11  *
  12  * $Id: ngircd.c,v 1.57 2002/10/09 16:53:02 alex Exp $
  13  *
  14  * ngircd.c: Hier beginnt alles ;-)
  15  */
  16
  17
  18 #include "portab.h"
  19
  20 #include "imp.h"
  21 #include <assert.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <time.h>
  32
  33 #include "resolve.h"
  34 #include "conn.h"
  35 #include "client.h"
  36 #include "channel.h"
  37 #include "conf.h"
  38 #include "cvs-version.h"
  39 #include "defines.h"
  40 #include "lists.h"
  41 #include "log.h"
  42 #include "parse.h"
  43 #include "irc.h"
  44
  45 #include "exp.h"
  46 #include "ngircd.h"
  47
  48
  49 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
  50 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
  51
  52 LOCAL VOID Initialize_Listen_Ports PARAMS(( VOID ));
  53
  54 LOCAL VOID Show_Version PARAMS(( VOID ));
  55 LOCAL VOID Show_Help PARAMS(( VOID ));
  56
  57
  58 GLOBAL int
  59 main( int argc, const char *argv[] )
  60 {
  61         BOOLEAN ok, configtest = FALSE;
  62         LONG pid, n;
  63         INT i;
  64
  65         umask( 0077 );
  66
  67         NGIRCd_Restart = FALSE;
  68         NGIRCd_Quit = FALSE;
  69         NGIRCd_NoDaemon = FALSE;
  70         NGIRCd_Passive = FALSE;
  71 #ifdef DEBUG
  72         NGIRCd_Debug = FALSE;
  73 #endif
  74 #ifdef SNIFFER
  75         NGIRCd_Sniffer = FALSE;
  76 #endif
  77         strcpy( NGIRCd_ConfFile, CONFIG_FILE );
  78
  79         /* Kommandozeile parsen */
  80         for( i = 1; i < argc; i++ )
  81         {
  82                 ok = FALSE;
  83                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
  84                 {
  85                         /* Lange Option */
  86
  87                         if( strcmp( argv[i], "--config" ) == 0 )
  88                         {
  89                                 if( i + 1 < argc )
  90                                 {
  91                                         /* Ok, danach kommt noch ein Parameter */
  92                                         strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
  93                                         NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
  94
  95                                         /* zum uebernaechsten Parameter */
  96                                         i++; ok = TRUE;
  97                                 }
  98                         }
  99                         if( strcmp( argv[i], "--configtest" ) == 0 )
 100                         {
 101                                 configtest = TRUE;
 102                                 ok = TRUE;
 103                         }
 104 #ifdef DEBUG
 105                         if( strcmp( argv[i], "--debug" ) == 0 )
 106                         {
 107                                 NGIRCd_Debug = TRUE;
 108                                 ok = TRUE;
 109                         }
 110 #endif
 111                         if( strcmp( argv[i], "--help" ) == 0 )
 112                         {
 113                                 Show_Version( );
 114                                 puts( "" ); Show_Help( ); puts( "" );
 115                                 exit( 1 );
 116                         }
 117                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 118                         {
 119                                 NGIRCd_NoDaemon = TRUE;
 120                                 ok = TRUE;
 121                         }
 122                         if( strcmp( argv[i], "--passive" ) == 0 )
 123                         {
 124                                 NGIRCd_Passive = TRUE;
 125                                 ok = TRUE;
 126                         }
 127 #ifdef SNIFFER
 128                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 129                         {
 130                                 NGIRCd_Sniffer = TRUE;
 131                                 ok = TRUE;
 132                         }
 133 #endif
 134                         if( strcmp( argv[i], "--version" ) == 0 )
 135                         {
 136                                 Show_Version( );
 137                                 exit( 1 );
 138                         }
 139                 }
 140                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 141                 {
 142                         /* Kurze Option */
 143
 144                         for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
 145                         {
 146                                 ok = FALSE;
 147 #ifdef DEBUG
 148                                 if( argv[i][n] == 'd' )
 149                                 {
 150                                         NGIRCd_Debug = TRUE;
 151                                         ok = TRUE;
 152                                 }
 153 #endif
 154                                 if( argv[i][n] == 'f' )
 155                                 {
 156                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 157                                         {
 158                                                 /* Ok, danach kommt ein Leerzeichen */
 159                                                 strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
 160                                                 NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
 161
 162                                                 /* zum uebernaechsten Parameter */
 163                                                 i++; n = (LONG)strlen( argv[i] );
 164                                                 ok = TRUE;
 165                                         }
 166                                 }
 167                                 if( argv[i][n] == 'n' )
 168                                 {
 169                                         NGIRCd_NoDaemon = TRUE;
 170                                         ok = TRUE;
 171                                 }
 172                                 if( argv[i][n] == 'p' )
 173                                 {
 174                                         NGIRCd_Passive = TRUE;
 175                                         ok = TRUE;
 176                                 }
 177 #ifdef SNIFFER
 178                                 if( argv[i][n] == 's' )
 179                                 {
 180                                         NGIRCd_Sniffer = TRUE;
 181                                         ok = TRUE;
 182                                 }
 183 #endif
 184
 185                                 if( ! ok )
 186                                 {
 187                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 188                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 189                                         exit( 1 );
 190                                 }
 191                         }
 192
 193                 }
 194                 if( ! ok )
 195                 {
 196                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 197                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 198                         exit( 1 );
 199                 }
 200         }
 201
 202         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 203         strcpy( NGIRCd_DebugLevel, "" );
 204 #ifdef DEBUG
 205         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 206 #endif
 207 #ifdef SNIFFER
 208         if( NGIRCd_Sniffer )
 209         {
 210                 NGIRCd_Debug = TRUE;
 211                 strcpy( NGIRCd_DebugLevel, "2" );
 212         }
 213 #endif
 214
 215         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 216         if( configtest )
 217         {
 218                 Show_Version( ); puts( "" );
 219                 exit( Conf_Test( ));
 220         }
 221
 222         while( ! NGIRCd_Quit )
 223         {
 224                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 225                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 226                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 227                  * verhindert werden. */
 228                 if( ! NGIRCd_NoDaemon )
 229                 {
 230                         /* Daemon im Hintergrund erzeugen */
 231                         pid = (LONG)fork( );
 232                         if( pid > 0 )
 233                         {
 234                                 /* "alter" Prozess */
 235                                 exit( 0 );
 236                         }
 237                         if( pid < 0 )
 238                         {
 239                                 /* Fehler */
 240                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 241                                 exit( 1 );
 242                         }
 243
 244                         /* Child-Prozess initialisieren */
 245                         (VOID)setsid( );
 246                         chdir( "/" );
 247                 }
 248
 249                 /* Globale Variablen initialisieren */
 250                 NGIRCd_Start = time( NULL );
 251                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 252                 NGIRCd_Restart = FALSE;
 253                 NGIRCd_Quit = 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                 Log( LOG_INFO, "Running as user %ld, group %ld, with PID %ld.", (LONG)getuid( ), (LONG)getgid( ), (LONG)getpid( ));
 280
 281                 Log_InitErrorfile( );
 282
 283                 /* Signal-Handler initialisieren */
 284                 Initialize_Signal_Handler( );
 285
 286                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 287                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 288                  * sind in doc/Protocol.txt beschrieben. */
 289 #ifdef IRCPLUS
 290                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 291                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 292 #else
 293                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
 294 #endif
 295                 strcat( NGIRCd_ProtoID, " P" );
 296                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 297
 298                 /* Vordefinierte Channels anlegen */
 299                 Channel_InitPredefined( );
 300
 301                 /* Listen-Ports initialisieren */
 302                 Initialize_Listen_Ports( );
 303
 304                 /* Hauptschleife */
 305                 Conn_Handler( );
 306
 307                 /* Alles abmelden */
 308                 Conn_Exit( );
 309                 Client_Exit( );
 310                 Channel_Exit( );
 311                 Lists_Exit( );
 312                 Log_Exit( );
 313         }
 314
 315         return 0;
 316 } /* main */
 317
 318
 319 GLOBAL CHAR *
 320 NGIRCd_Version( VOID )
 321 {
 322         STATIC CHAR version[126];
 323
 324 #ifdef CVSDATE
 325         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 326 #else
 327         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 328 #endif
 329         return version;
 330 } /* NGIRCd_Version */
 331
 332
 333 GLOBAL CHAR *
 334 NGIRCd_VersionAddition( VOID )
 335 {
 336         STATIC CHAR txt[64];
 337
 338         strcpy( txt, "" );
 339
 340 #ifdef USE_SYSLOG
 341         if( txt[0] ) strcat( txt, "+" );
 342         strcat( txt, "SYSLOG" );
 343 #endif
 344 #ifdef DEBUG
 345         if( txt[0] ) strcat( txt, "+" );
 346         strcat( txt, "DEBUG" );
 347 #endif
 348 #ifdef SNIFFER
 349         if( txt[0] ) strcat( txt, "+" );
 350         strcat( txt, "SNIFFER" );
 351 #endif
 352 #ifdef STRICT_RFC
 353         if( txt[0] ) strcat( txt, "+" );
 354         strcat( txt, "RFC" );
 355 #endif
 356 #ifdef IRCPLUS
 357         if( txt[0] ) strcat( txt, "+" );
 358         strcat( txt, "IRCPLUS" );
 359 #endif
 360
 361         if( txt[0] ) strcat( txt, "-" );
 362         strcat( txt, TARGET_CPU );
 363         strcat( txt, "/" );
 364         strcat( txt, TARGET_VENDOR );
 365         strcat( txt, "/" );
 366         strcat( txt, TARGET_OS );
 367
 368         return txt;
 369 } /* NGIRCd_VersionAddition */
 370
 371
 372 LOCAL VOID
 373 Initialize_Signal_Handler( VOID )
 374 {
 375         /* Signal-Handler initialisieren: einige Signale
 376          * werden ignoriert, andere speziell behandelt. */
 377
 378 #ifdef HAVE_SIGACTION
 379         /* sigaction() ist vorhanden */
 380
 381         struct sigaction saction;
 382
 383         /* Signal-Struktur initialisieren */
 384         memset( &saction, 0, sizeof( saction ));
 385         saction.sa_handler = Signal_Handler;
 386 #ifdef SA_RESTART
 387         saction.sa_flags |= SA_RESTART;
 388 #endif
 389 #ifdef SA_NOCLDWAIT
 390         saction.sa_flags |= SA_NOCLDWAIT;
 391 #endif
 392
 393         /* Signal-Handler einhaengen */
 394         sigaction( SIGINT, &saction, NULL );
 395         sigaction( SIGQUIT, &saction, NULL );
 396         sigaction( SIGTERM, &saction, NULL);
 397         sigaction( SIGHUP, &saction, NULL);
 398         sigaction( SIGCHLD, &saction, NULL);
 399
 400         /* einige Signale ignorieren */
 401         saction.sa_handler = SIG_IGN;
 402         sigaction( SIGPIPE, &saction, NULL );
 403 #else
 404         /* kein sigaction() vorhanden */
 405
 406         /* Signal-Handler einhaengen */
 407         signal( SIGINT, Signal_Handler );
 408         signal( SIGQUIT, Signal_Handler );
 409         signal( SIGTERM, Signal_Handler );
 410         signal( SIGHUP, Signal_Handler );
 411         signal( SIGCHLD, Signal_Handler );
 412
 413         /* einige Signale ignorieren */
 414         signal( SIGPIPE, SIG_IGN );
 415 #endif
 416 } /* Initialize_Signal_Handler */
 417
 418
 419 LOCAL VOID
 420 Signal_Handler( INT Signal )
 421 {
 422         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 423          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 424          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 425
 426         switch( Signal )
 427         {
 428                 case SIGTERM:
 429                 case SIGINT:
 430                 case SIGQUIT:
 431                         /* wir soll(t)en uns wohl beenden ... */
 432                         if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
 433                         else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
 434                         else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
 435                         NGIRCd_Quit = TRUE;
 436                         break;
 437                 case SIGHUP:
 438                         /* neu starten */
 439                         Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
 440                         NGIRCd_Restart = TRUE;
 441                         break;
 442                 case SIGCHLD:
 443                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 444                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 445                         break;
 446                 default:
 447                         /* unbekanntes bzw. unbehandeltes Signal */
 448                         Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
 449         }
 450 } /* Signal_Handler */
 451
 452
 453 LOCAL VOID
 454 Initialize_Listen_Ports( VOID )
 455 {
 456         /* Ports, auf denen der Server Verbindungen entgegennehmen
 457          * soll, initialisieren */
 458
 459         INT created, i;
 460
 461         created = 0;
 462         for( i = 0; i < Conf_ListenPorts_Count; i++ )
 463         {
 464                 if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
 465                 else Log( LOG_ERR, "Can't listen on port %u!", Conf_ListenPorts[i] );
 466         }
 467
 468         if( created < 1 )
 469         {
 470                 Log( LOG_ALERT, "Server isn't listening on a single port!" );
 471                 Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 472                 exit( 1 );
 473         }
 474 } /* Initialize_Listen_Ports */
 475
 476
 477 LOCAL VOID
 478 Show_Version( VOID )
 479 {
 480         puts( NGIRCd_Version( ));
 481         puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
 482         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 483         puts( "This is free software; see the source for copying conditions. There is NO" );
 484         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 485 } /* Show_Version */
 486
 487
 488 LOCAL VOID
 489 Show_Help( VOID )
 490 {
 491 #ifdef DEBUG
 492         puts( "  -d, --debug        log extra debug messages" );
 493 #endif
 494         puts( "  -f, --config <f>   use file <f> as configuration file" );
 495         puts( "  -n, --nodaemon     don't fork and don't detatch from controlling terminal" );
 496         puts( "  -p, --passive      disable automatic connections to other servers" );
 497 #ifdef SNIFFER
 498         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 499 #endif
 500         puts( "      --configtest   read, validate and display configuration; then exit" );
 501         puts( "      --version      output version information and exit" );
 502         puts( "      --help         display this help and exit" );
 503 } /* Show_Help */
 504
 505
 506 /* -eof- */