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 1.59 2002/11/18 18:49:34 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 Initialize_Listen_Ports PARAMS(( VOID ));
  55
  56 LOCAL VOID Show_Version PARAMS(( VOID ));
  57 LOCAL VOID Show_Help PARAMS(( VOID ));
  58
  59
  60 GLOBAL int
  61 main( int argc, const char *argv[] )
  62 {
  63         struct passwd *pwd;
  64         struct group *grp;
  65         BOOLEAN ok, configtest = FALSE;
  66         LONG pid, n;
  67         INT i;
  68
  69         umask( 0077 );
  70
  71         NGIRCd_Restart = FALSE;
  72         NGIRCd_Quit = FALSE;
  73         NGIRCd_NoDaemon = FALSE;
  74         NGIRCd_Passive = FALSE;
  75 #ifdef DEBUG
  76         NGIRCd_Debug = FALSE;
  77 #endif
  78 #ifdef SNIFFER
  79         NGIRCd_Sniffer = FALSE;
  80 #endif
  81         strcpy( NGIRCd_ConfFile, CONFIG_FILE );
  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, danach kommt noch ein Parameter */
  96                                         strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
  97                                         NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
  98
  99                                         /* zum uebernaechsten Parameter */
 100                                         i++; ok = TRUE;
 101                                 }
 102                         }
 103                         if( strcmp( argv[i], "--configtest" ) == 0 )
 104                         {
 105                                 configtest = TRUE;
 106                                 ok = TRUE;
 107                         }
 108 #ifdef DEBUG
 109                         if( strcmp( argv[i], "--debug" ) == 0 )
 110                         {
 111                                 NGIRCd_Debug = TRUE;
 112                                 ok = TRUE;
 113                         }
 114 #endif
 115                         if( strcmp( argv[i], "--help" ) == 0 )
 116                         {
 117                                 Show_Version( );
 118                                 puts( "" ); Show_Help( ); puts( "" );
 119                                 exit( 1 );
 120                         }
 121                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 122                         {
 123                                 NGIRCd_NoDaemon = TRUE;
 124                                 ok = TRUE;
 125                         }
 126                         if( strcmp( argv[i], "--passive" ) == 0 )
 127                         {
 128                                 NGIRCd_Passive = TRUE;
 129                                 ok = TRUE;
 130                         }
 131 #ifdef SNIFFER
 132                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 133                         {
 134                                 NGIRCd_Sniffer = TRUE;
 135                                 ok = TRUE;
 136                         }
 137 #endif
 138                         if( strcmp( argv[i], "--version" ) == 0 )
 139                         {
 140                                 Show_Version( );
 141                                 exit( 1 );
 142                         }
 143                 }
 144                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 145                 {
 146                         /* Kurze Option */
 147
 148                         for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
 149                         {
 150                                 ok = FALSE;
 151 #ifdef DEBUG
 152                                 if( argv[i][n] == 'd' )
 153                                 {
 154                                         NGIRCd_Debug = TRUE;
 155                                         ok = TRUE;
 156                                 }
 157 #endif
 158                                 if( argv[i][n] == 'f' )
 159                                 {
 160                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 161                                         {
 162                                                 /* Ok, danach kommt ein Leerzeichen */
 163                                                 strncpy( NGIRCd_ConfFile, argv[i + 1], FNAME_LEN - 1 );
 164                                                 NGIRCd_ConfFile[FNAME_LEN - 1] = '\0';
 165
 166                                                 /* zum uebernaechsten Parameter */
 167                                                 i++; n = (LONG)strlen( argv[i] );
 168                                                 ok = TRUE;
 169                                         }
 170                                 }
 171                                 if( argv[i][n] == 'n' )
 172                                 {
 173                                         NGIRCd_NoDaemon = TRUE;
 174                                         ok = TRUE;
 175                                 }
 176                                 if( argv[i][n] == 'p' )
 177                                 {
 178                                         NGIRCd_Passive = TRUE;
 179                                         ok = TRUE;
 180                                 }
 181 #ifdef SNIFFER
 182                                 if( argv[i][n] == 's' )
 183                                 {
 184                                         NGIRCd_Sniffer = TRUE;
 185                                         ok = TRUE;
 186                                 }
 187 #endif
 188
 189                                 if( ! ok )
 190                                 {
 191                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE, argv[i][n] );
 192                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 193                                         exit( 1 );
 194                                 }
 195                         }
 196
 197                 }
 198                 if( ! ok )
 199                 {
 200                         printf( "%s: invalid option \"%s\"!\n", PACKAGE, argv[i] );
 201                         printf( "Try \"%s --help\" for more information.\n", PACKAGE );
 202                         exit( 1 );
 203                 }
 204         }
 205
 206         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 207         strcpy( NGIRCd_DebugLevel, "" );
 208 #ifdef DEBUG
 209         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 210 #endif
 211 #ifdef SNIFFER
 212         if( NGIRCd_Sniffer )
 213         {
 214                 NGIRCd_Debug = TRUE;
 215                 strcpy( NGIRCd_DebugLevel, "2" );
 216         }
 217 #endif
 218
 219         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 220         if( configtest )
 221         {
 222                 Show_Version( ); puts( "" );
 223                 exit( Conf_Test( ));
 224         }
 225
 226         while( ! NGIRCd_Quit )
 227         {
 228                 /* In der Regel wird ein Sub-Prozess ge-fork()'t, der
 229                  * nicht mehr mit dem Terminal verbunden ist. Mit der
 230                  * Option "--nodaemon" kann dies (z.B. zum Debuggen)
 231                  * verhindert werden. */
 232                 if( ! NGIRCd_NoDaemon )
 233                 {
 234                         /* Daemon im Hintergrund erzeugen */
 235                         pid = (LONG)fork( );
 236                         if( pid > 0 )
 237                         {
 238                                 /* "alter" Prozess */
 239                                 exit( 0 );
 240                         }
 241                         if( pid < 0 )
 242                         {
 243                                 /* Fehler */
 244                                 printf( "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE, strerror( errno ));
 245                                 exit( 1 );
 246                         }
 247
 248                         /* Child-Prozess initialisieren */
 249                         (VOID)setsid( );
 250                         chdir( "/" );
 251                 }
 252
 253                 /* Globale Variablen initialisieren */
 254                 NGIRCd_Start = time( NULL );
 255                 (VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 256                 NGIRCd_Restart = FALSE;
 257                 NGIRCd_Quit = FALSE;
 258
 259                 /* Module initialisieren */
 260                 Log_Init( );
 261                 Resolve_Init( );
 262                 Conf_Init( );
 263                 Lists_Init( );
 264                 Channel_Init( );
 265                 Client_Init( );
 266                 Conn_Init( );
 267
 268                 /* Wenn als root ausgefuehrt und eine andere UID
 269                  * konfiguriert ist, jetzt zu dieser wechseln */
 270                 if( getuid( ) == 0 )
 271                 {
 272                         if( Conf_GID != 0 )
 273                         {
 274                                 /* Neue Group-ID setzen */
 275                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 276                         }
 277                         if( Conf_UID != 0 )
 278                         {
 279                                 /* Neue User-ID setzen */
 280                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 281                         }
 282                 }
 283
 284                 /* User, Gruppe und Prozess-ID des Daemon ausgeben */
 285                 pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
 286                 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( ));
 287
 288                 /* stderr in "Error-File" umlenken */
 289                 Log_InitErrorfile( );
 290
 291                 /* Signal-Handler initialisieren */
 292                 Initialize_Signal_Handler( );
 293
 294                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 295                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 296                  * sind in doc/Protocol.txt beschrieben. */
 297 #ifdef IRCPLUS
 298                 sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE, VERSION, IRCPLUSFLAGS );
 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                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 305
 306                 /* Vordefinierte Channels anlegen */
 307                 Channel_InitPredefined( );
 308
 309                 /* Listen-Ports initialisieren */
 310                 Initialize_Listen_Ports( );
 311
 312                 /* Hauptschleife */
 313                 Conn_Handler( );
 314
 315                 /* Alles abmelden */
 316                 Conn_Exit( );
 317                 Client_Exit( );
 318                 Channel_Exit( );
 319                 Lists_Exit( );
 320                 Log_Exit( );
 321         }
 322
 323         return 0;
 324 } /* main */
 325
 326
 327 GLOBAL CHAR *
 328 NGIRCd_Version( VOID )
 329 {
 330         STATIC CHAR version[126];
 331
 332 #ifdef CVSDATE
 333         sprintf( version, "%s %s(%s)-%s", PACKAGE, VERSION, CVSDATE, NGIRCd_VersionAddition( ));
 334 #else
 335         sprintf( version, "%s %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 336 #endif
 337         return version;
 338 } /* NGIRCd_Version */
 339
 340
 341 GLOBAL CHAR *
 342 NGIRCd_VersionAddition( VOID )
 343 {
 344         STATIC CHAR txt[64];
 345
 346         strcpy( txt, "" );
 347
 348 #ifdef USE_SYSLOG
 349         if( txt[0] ) strcat( txt, "+" );
 350         strcat( txt, "SYSLOG" );
 351 #endif
 352 #ifdef DEBUG
 353         if( txt[0] ) strcat( txt, "+" );
 354         strcat( txt, "DEBUG" );
 355 #endif
 356 #ifdef SNIFFER
 357         if( txt[0] ) strcat( txt, "+" );
 358         strcat( txt, "SNIFFER" );
 359 #endif
 360 #ifdef STRICT_RFC
 361         if( txt[0] ) strcat( txt, "+" );
 362         strcat( txt, "RFC" );
 363 #endif
 364 #ifdef IRCPLUS
 365         if( txt[0] ) strcat( txt, "+" );
 366         strcat( txt, "IRCPLUS" );
 367 #endif
 368
 369         if( txt[0] ) strcat( txt, "-" );
 370         strcat( txt, TARGET_CPU );
 371         strcat( txt, "/" );
 372         strcat( txt, TARGET_VENDOR );
 373         strcat( txt, "/" );
 374         strcat( txt, TARGET_OS );
 375
 376         return txt;
 377 } /* NGIRCd_VersionAddition */
 378
 379
 380 LOCAL VOID
 381 Initialize_Signal_Handler( VOID )
 382 {
 383         /* Signal-Handler initialisieren: einige Signale
 384          * werden ignoriert, andere speziell behandelt. */
 385
 386 #ifdef HAVE_SIGACTION
 387         /* sigaction() ist vorhanden */
 388
 389         struct sigaction saction;
 390
 391         /* Signal-Struktur initialisieren */
 392         memset( &saction, 0, sizeof( saction ));
 393         saction.sa_handler = Signal_Handler;
 394 #ifdef SA_RESTART
 395         saction.sa_flags |= SA_RESTART;
 396 #endif
 397 #ifdef SA_NOCLDWAIT
 398         saction.sa_flags |= SA_NOCLDWAIT;
 399 #endif
 400
 401         /* Signal-Handler einhaengen */
 402         sigaction( SIGINT, &saction, NULL );
 403         sigaction( SIGQUIT, &saction, NULL );
 404         sigaction( SIGTERM, &saction, NULL);
 405         sigaction( SIGHUP, &saction, NULL);
 406         sigaction( SIGCHLD, &saction, NULL);
 407
 408         /* einige Signale ignorieren */
 409         saction.sa_handler = SIG_IGN;
 410         sigaction( SIGPIPE, &saction, NULL );
 411 #else
 412         /* kein sigaction() vorhanden */
 413
 414         /* Signal-Handler einhaengen */
 415         signal( SIGINT, Signal_Handler );
 416         signal( SIGQUIT, Signal_Handler );
 417         signal( SIGTERM, Signal_Handler );
 418         signal( SIGHUP, Signal_Handler );
 419         signal( SIGCHLD, Signal_Handler );
 420
 421         /* einige Signale ignorieren */
 422         signal( SIGPIPE, SIG_IGN );
 423 #endif
 424 } /* Initialize_Signal_Handler */
 425
 426
 427 LOCAL VOID
 428 Signal_Handler( INT Signal )
 429 {
 430         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 431          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 432          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 433
 434         switch( Signal )
 435         {
 436                 case SIGTERM:
 437                 case SIGINT:
 438                 case SIGQUIT:
 439                         /* wir soll(t)en uns wohl beenden ... */
 440                         if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
 441                         else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
 442                         else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
 443                         NGIRCd_Quit = TRUE;
 444                         break;
 445                 case SIGHUP:
 446                         /* neu starten */
 447                         Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
 448                         NGIRCd_Restart = TRUE;
 449                         break;
 450                 case SIGCHLD:
 451                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 452                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 453                         break;
 454                 default:
 455                         /* unbekanntes bzw. unbehandeltes Signal */
 456                         Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
 457         }
 458 } /* Signal_Handler */
 459
 460
 461 LOCAL VOID
 462 Initialize_Listen_Ports( VOID )
 463 {
 464         /* Ports, auf denen der Server Verbindungen entgegennehmen
 465          * soll, initialisieren */
 466
 467         INT created, i;
 468
 469         created = 0;
 470         for( i = 0; i < Conf_ListenPorts_Count; i++ )
 471         {
 472                 if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
 473                 else Log( LOG_ERR, "Can't listen on port %u!", Conf_ListenPorts[i] );
 474         }
 475
 476         if( created < 1 )
 477         {
 478                 Log( LOG_ALERT, "Server isn't listening on a single port!" );
 479                 Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 480                 exit( 1 );
 481         }
 482 } /* Initialize_Listen_Ports */
 483
 484
 485 LOCAL VOID
 486 Show_Version( VOID )
 487 {
 488         puts( NGIRCd_Version( ));
 489         puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
 490         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 491         puts( "This is free software; see the source for copying conditions. There is NO" );
 492         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 493 } /* Show_Version */
 494
 495
 496 LOCAL VOID
 497 Show_Help( VOID )
 498 {
 499 #ifdef DEBUG
 500         puts( "  -d, --debug        log extra debug messages" );
 501 #endif
 502         puts( "  -f, --config <f>   use file <f> as configuration file" );
 503         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 504         puts( "  -p, --passive      disable automatic connections to other servers" );
 505 #ifdef SNIFFER
 506         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 507 #endif
 508         puts( "      --configtest   read, validate and display configuration; then exit" );
 509         puts( "      --version      output version information and exit" );
 510         puts( "      --help         display this help and exit" );
 511 } /* Show_Help */
 512
 513
 514 /* -eof- */