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 1.61 2002/11/22 23:31:23 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 #include <pwd.h>
  33 #include <grp.h>
  34
  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 "defines.h"
  42 #include "lists.h"
  43 #include "log.h"
  44 #include "parse.h"
  45 #include "irc.h"
  46
  47 #include "exp.h"
  48 #include "ngircd.h"
  49
  50
  51 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
  52 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
  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         struct passwd *pwd;
  62         struct group *grp;
  63         BOOLEAN ok, configtest = FALSE;
  64         LONG pid, n;
  65         INT i;
  66
  67         umask( 0077 );
  68
  69         NGIRCd_Restart = FALSE;
  70         NGIRCd_Quit = FALSE;
  71         NGIRCd_NoDaemon = FALSE;
  72         NGIRCd_Passive = FALSE;
  73 #ifdef DEBUG
  74         NGIRCd_Debug = FALSE;
  75 #endif
  76 #ifdef SNIFFER
  77         NGIRCd_Sniffer = FALSE;
  78 #endif
  79         strcpy( NGIRCd_ConfFile, CONFIG_FILE );
  80
  81         /* Kommandozeile parsen */
  82         for( i = 1; i < argc; i++ )
  83         {
  84                 ok = FALSE;
  85                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
  86                 {
  87                         /* Lange Option */
  88
  89                         if( strcmp( argv[i], "--config" ) == 0 )
  90                         {
  91                                 if( i + 1 < argc )
  92                                 {
  93                                         /* Ok, danach kommt noch ein Parameter */
  94                                         strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
  95                                         NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
  96
  97                                         /* zum uebernaechsten Parameter */
  98                                         i++; ok = TRUE;
  99                                 }
 100                         }
 101                         if( strcmp( argv[i], "--configtest" ) == 0 )
 102                         {
 103                                 configtest = TRUE;
 104                                 ok = TRUE;
 105                         }
 106 #ifdef DEBUG
 107                         if( strcmp( argv[i], "--debug" ) == 0 )
 108                         {
 109                                 NGIRCd_Debug = TRUE;
 110                                 ok = TRUE;
 111                         }
 112 #endif
 113                         if( strcmp( argv[i], "--help" ) == 0 )
 114                         {
 115                                 Show_Version( );
 116                                 puts( "" ); Show_Help( ); puts( "" );
 117                                 exit( 1 );
 118                         }
 119                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 120                         {
 121                                 NGIRCd_NoDaemon = TRUE;
 122                                 ok = TRUE;
 123                         }
 124                         if( strcmp( argv[i], "--passive" ) == 0 )
 125                         {
 126                                 NGIRCd_Passive = TRUE;
 127                                 ok = TRUE;
 128                         }
 129 #ifdef SNIFFER
 130                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 131                         {
 132                                 NGIRCd_Sniffer = TRUE;
 133                                 ok = TRUE;
 134                         }
 135 #endif
 136                         if( strcmp( argv[i], "--version" ) == 0 )
 137                         {
 138                                 Show_Version( );
 139                                 exit( 1 );
 140                         }
 141                 }
 142                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 143                 {
 144                         /* Kurze Option */
 145
 146                         for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
 147                         {
 148                                 ok = FALSE;
 149 #ifdef DEBUG
 150                                 if( argv[i][n] == 'd' )
 151                                 {
 152                                         NGIRCd_Debug = TRUE;
 153                                         ok = TRUE;
 154                                 }
 155 #endif
 156                                 if( argv[i][n] == 'f' )
 157                                 {
 158                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 159                                         {
 160                                                 /* Ok, danach kommt ein Leerzeichen */
 161                                                 strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
 162                                                 NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
 163
 164                                                 /* zum uebernaechsten 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
 187                                 if( ! ok )
 188                                 {
 189                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 190                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 191                                         exit( 1 );
 192                                 }
 193                         }
 194
 195                 }
 196                 if( ! ok )
 197                 {
 198                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 199                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 200                         exit( 1 );
 201                 }
 202         }
 203
 204         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 205         strcpy( NGIRCd_DebugLevel, "" );
 206 #ifdef DEBUG
 207         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 208 #endif
 209 #ifdef SNIFFER
 210         if( NGIRCd_Sniffer )
 211         {
 212                 NGIRCd_Debug = TRUE;
 213                 strcpy( NGIRCd_DebugLevel, "2" );
 214         }
 215 #endif
 216
 217         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 218         if( configtest )
 219         {
 220                 Show_Version( ); puts( "" );
 221                 exit( Conf_Test( ));
 222         }
 223
 224         while( ! NGIRCd_Quit )
 225         {
 226                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 227                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 228                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 229                  * verhindert werden. */
 230                 if( ! NGIRCd_NoDaemon )
 231                 {
 232                         /* Daemon im Hintergrund erzeugen */
 233                         pid = (LONG)fork( );
 234                         if( pid > 0 )
 235                         {
 236                                 /* "alter" Prozess */
 237                                 exit( 0 );
 238                         }
 239                         if( pid < 0 )
 240                         {
 241                                 /* Fehler */
 242                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 243                                 exit( 1 );
 244                         }
 245
 246                         /* Child-Prozess initialisieren */
 247                         (VOID)setsid( );
 248                         chdir( "/" );
 249                 }
 250
 251                 /* Globale Variablen initialisieren */
 252                 NGIRCd_Start = time( NULL );
 253                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 254                 NGIRCd_Restart = FALSE;
 255                 NGIRCd_Quit = FALSE;
 256
 257                 /* Module initialisieren */
 258                 Log_Init( );
 259                 Resolve_Init( );
 260                 Conf_Init( );
 261                 Lists_Init( );
 262                 Channel_Init( );
 263                 Client_Init( );
 264                 Conn_Init( );
 265
 266                 /* Wenn als root ausgefuehrt und eine andere UID
 267                  * konfiguriert ist, jetzt zu dieser wechseln */
 268                 if( getuid( ) == 0 )
 269                 {
 270                         if( Conf_GID != 0 )
 271                         {
 272                                 /* Neue Group-ID setzen */
 273                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 274                         }
 275                         if( Conf_UID != 0 )
 276                         {
 277                                 /* Neue User-ID setzen */
 278                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 279                         }
 280                 }
 281
 282                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 283                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 284                 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( ));
 285
 286                 /* stderr in "Error-File" umlenken */
 287                 Log_InitErrorfile( );
 288
 289                 /* Signal-Handler initialisieren */
 290                 Initialize_Signal_Handler( );
 291
 292                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 293                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 294                  * sind in doc/Protocol.txt beschrieben. */
 295 #ifdef IRCPLUS
 296                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 297                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 298 #else
 299                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE, VERSION );
 300 #endif
 301                 strcat( NGIRCd_ProtoID, " P" );
 302                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 303
 304                 /* Vordefinierte Channels anlegen */
 305                 Channel_InitPredefined( );
 306
 307                 /* Listen-Ports initialisieren */
 308                 if( Conn_InitListeners( ) < 1 )
 309                 {
 310                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 311                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 312                         exit( 1 );
 313                 }
 314
 315                 /* Hauptschleife */
 316                 Conn_Handler( );
 317
 318                 /* Alles abmelden */
 319                 Conn_Exit( );
 320                 Client_Exit( );
 321                 Channel_Exit( );
 322                 Lists_Exit( );
 323                 Log_Exit( );
 324         }
 325
 326         return 0;
 327 } /* main */
 328
 329
 330 GLOBAL CHAR *
 331 NGIRCd_Version( VOID )
 332 {
 333         STATIC CHAR version[126];
 334
 335 #ifdef CVSDATE
 336         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 337 #else
 338         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 339 #endif
 340         return version;
 341 } /* NGIRCd_Version */
 342
 343
 344 GLOBAL CHAR *
 345 NGIRCd_VersionAddition( VOID )
 346 {
 347         STATIC CHAR txt[64];
 348
 349         strcpy( txt, "" );
 350
 351 #ifdef USE_SYSLOG
 352         if( txt[0] ) strcat( txt, "+" );
 353         strcat( txt, "SYSLOG" );
 354 #endif
 355 #ifdef DEBUG
 356         if( txt[0] ) strcat( txt, "+" );
 357         strcat( txt, "DEBUG" );
 358 #endif
 359 #ifdef SNIFFER
 360         if( txt[0] ) strcat( txt, "+" );
 361         strcat( txt, "SNIFFER" );
 362 #endif
 363 #ifdef STRICT_RFC
 364         if( txt[0] ) strcat( txt, "+" );
 365         strcat( txt, "RFC" );
 366 #endif
 367 #ifdef IRCPLUS
 368         if( txt[0] ) strcat( txt, "+" );
 369         strcat( txt, "IRCPLUS" );
 370 #endif
 371
 372         if( txt[0] ) strcat( txt, "-" );
 373         strcat( txt, TARGET_CPU );
 374         strcat( txt, "/" );
 375         strcat( txt, TARGET_VENDOR );
 376         strcat( txt, "/" );
 377         strcat( txt, TARGET_OS );
 378
 379         return txt;
 380 } /* NGIRCd_VersionAddition */
 381
 382
 383 GLOBAL VOID
 384 NGIRCd_Rehash( VOID )
 385 {
 386         CHAR old_name[CLIENT_ID_LEN];
 387
 388         /* Alle Listen-Sockets schliessen */
 389         Conn_ExitListeners( );
 390
 391         /* Alten Server-Namen merken */
 392         strcpy( old_name, Conf_ServerName );
 393
 394         /* Konfiguration neu lesen ... */
 395         Conf_Init( );
 396
 397         /* Alten Server-Namen wiederherstellen: dieser
 398          * kann nicht zur Laufzeit geaendert werden ... */
 399         if( strcmp( old_name, Conf_ServerName ) != 0 )
 400         {
 401                 strcpy( Conf_ServerName, old_name );
 402                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 403         }
 404
 405         /* neue pre-defined Channel anlegen: */
 406         Channel_InitPredefined( );
 407
 408         /* Listen-Sockets neu anlegen: */
 409         Conn_InitListeners( );
 410
 411         Log( LOG_INFO, "Re-reading of configuration done." );
 412 } /* NGIRCd_Rehash */
 413
 414
 415 LOCAL VOID
 416 Initialize_Signal_Handler( VOID )
 417 {
 418         /* Signal-Handler initialisieren: einige Signale
 419          * werden ignoriert, andere speziell behandelt. */
 420
 421 #ifdef HAVE_SIGACTION
 422         /* sigaction() ist vorhanden */
 423
 424         struct sigaction saction;
 425
 426         /* Signal-Struktur initialisieren */
 427         memset( &saction, 0, sizeof( saction ));
 428         saction.sa_handler = Signal_Handler;
 429 #ifdef SA_RESTART
 430         saction.sa_flags |= SA_RESTART;
 431 #endif
 432 #ifdef SA_NOCLDWAIT
 433         saction.sa_flags |= SA_NOCLDWAIT;
 434 #endif
 435
 436         /* Signal-Handler einhaengen */
 437         sigaction( SIGINT, &saction, NULL );
 438         sigaction( SIGQUIT, &saction, NULL );
 439         sigaction( SIGTERM, &saction, NULL);
 440         sigaction( SIGHUP, &saction, NULL);
 441         sigaction( SIGCHLD, &saction, NULL);
 442
 443         /* einige Signale ignorieren */
 444         saction.sa_handler = SIG_IGN;
 445         sigaction( SIGPIPE, &saction, NULL );
 446 #else
 447         /* kein sigaction() vorhanden */
 448
 449         /* Signal-Handler einhaengen */
 450         signal( SIGINT, Signal_Handler );
 451         signal( SIGQUIT, Signal_Handler );
 452         signal( SIGTERM, Signal_Handler );
 453         signal( SIGHUP, Signal_Handler );
 454         signal( SIGCHLD, Signal_Handler );
 455
 456         /* einige Signale ignorieren */
 457         signal( SIGPIPE, SIG_IGN );
 458 #endif
 459 } /* Initialize_Signal_Handler */
 460
 461
 462 LOCAL VOID
 463 Signal_Handler( INT Signal )
 464 {
 465         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 466          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 467          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 468
 469         switch( Signal )
 470         {
 471                 case SIGTERM:
 472                 case SIGINT:
 473                 case SIGQUIT:
 474                         /* wir soll(t)en uns wohl beenden ... */
 475                         if( Signal == SIGTERM ) Log( LOG_WARNING|LOG_snotice, "Got TERM signal, terminating now ..." );
 476                         else if( Signal == SIGINT ) Log( LOG_WARNING|LOG_snotice, "Got INT signal, terminating now ..." );
 477                         else if( Signal == SIGQUIT ) Log( LOG_WARNING|LOG_snotice, "Got QUIT signal, terminating now ..." );
 478                         NGIRCd_Quit = TRUE;
 479                         break;
 480                 case SIGHUP:
 481                         /* Konfiguration neu einlesen: */
 482                         Log( LOG_WARNING|LOG_snotice, "Got HUP signal, re-reading configuration ..." );
 483                         NGIRCd_Rehash( );
 484                         break;
 485                 case SIGCHLD:
 486                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 487                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 488                         break;
 489                 default:
 490                         /* unbekanntes bzw. unbehandeltes Signal */
 491                         Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
 492         }
 493 } /* Signal_Handler */
 494
 495
 496 LOCAL VOID
 497 Show_Version( VOID )
 498 {
 499         puts( NGIRCd_Version( ));
 500         puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
 501         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 502         puts( "This is free software; see the source for copying conditions. There is NO" );
 503         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 504 } /* Show_Version */
 505
 506
 507 LOCAL VOID
 508 Show_Help( VOID )
 509 {
 510 #ifdef DEBUG
 511         puts( "  -d, --debug        log extra debug messages" );
 512 #endif
 513         puts( "  -f, --config <f>   use file <f> as configuration file" );
 514         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 515         puts( "  -p, --passive      disable automatic connections to other servers" );
 516 #ifdef SNIFFER
 517         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 518 #endif
 519         puts( "      --configtest   read, validate and display configuration; then exit" );
 520         puts( "      --version      output version information and exit" );
 521         puts( "      --help         display this help and exit" );
 522 } /* Show_Help */
 523
 524
 525 /* -eof- */