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 1.48 2002/06/02 17:01:21 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 "defines.h"
  39 #include "lists.h"
  40 #include "log.h"
  41 #include "parse.h"
  42 #include "irc.h"
  43
  44 #include "exp.h"
  45 #include "ngircd.h"
  46
  47
  48 LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
  49 LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
  50
  51 LOCAL VOID Initialize_Listen_Ports PARAMS(( VOID ));
  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         BOOLEAN ok, configtest = FALSE;
  61         INT32 pid, n;
  62         INT i;
  63
  64         umask( 0077 );
  65
  66         NGIRCd_Restart = FALSE;
  67         NGIRCd_Quit = FALSE;
  68         NGIRCd_NoDaemon = FALSE;
  69         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 < (INT32)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 = 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_Quit )
 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 = (INT32)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_Restart = FALSE;
 252                 NGIRCd_Quit = FALSE;
 253
 254                 /* Module initialisieren */
 255                 Log_Init( );
 256                 Resolve_Init( );
 257                 Conf_Init( );
 258                 Lists_Init( );
 259                 Channel_Init( );
 260                 Client_Init( );
 261                 Conn_Init( );
 262
 263                 /* Wenn als root ausgefuehrt und eine andere UID
 264                  * konfiguriert ist, jetzt zu dieser wechseln */
 265                 if( getuid( ) == 0 )
 266                 {
 267                         if( Conf_GID != 0 )
 268                         {
 269                                 /* Neue Group-ID setzen */
 270                                 if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change Group-ID to %u: %s", Conf_GID, strerror( errno ));
 271                         }
 272                         if( Conf_UID != 0 )
 273                         {
 274                                 /* Neue User-ID setzen */
 275                                 if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change User-ID to %u: %s", Conf_UID, strerror( errno ));
 276                         }
 277                 }
 278                 Log( LOG_INFO, "Running as user %ld, group %ld.", (INT32)getuid( ), (INT32)getgid( ));
 279
 280                 Log_InitErrorfile( );
 281
 282                 /* Signal-Handler initialisieren */
 283                 Initialize_Signal_Handler( );
 284
 285                 /* Listen-Ports initialisieren */
 286                 Initialize_Listen_Ports( );
 287
 288                 /* Hauptschleife */
 289                 Conn_Handler( );
 290
 291                 /* Alles abmelden */
 292                 Conn_Exit( );
 293                 Client_Exit( );
 294                 Channel_Exit( );
 295                 Lists_Exit( );
 296                 Log_Exit( );
 297         }
 298
 299         return 0;
 300 } /* main */
 301
 302
 303 GLOBAL CHAR *
 304 NGIRCd_Version( VOID )
 305 {
 306         STATIC CHAR version[126];
 307
 308         sprintf( version, "%s version %s-%s", PACKAGE, VERSION, NGIRCd_VersionAddition( ));
 309         return version;
 310 } /* NGIRCd_Version */
 311
 312
 313 GLOBAL CHAR *
 314 NGIRCd_VersionAddition( VOID )
 315 {
 316         STATIC CHAR txt[64];
 317
 318         strcpy( txt, "" );
 319
 320 #ifdef USE_SYSLOG
 321         if( txt[0] ) strcat( txt, "+" );
 322         strcat( txt, "SYSLOG" );
 323 #endif
 324 #ifdef REGEX
 325         if( txt[0] ) strcat( txt, "+" );
 326         strcat( txt, "REGEX" );
 327 #endif
 328 #ifdef STRICT_RFC
 329         if( txt[0] ) strcat( txt, "+" );
 330         strcat( txt, "RFC" );
 331 #endif
 332 #ifdef DEBUG
 333         if( txt[0] ) strcat( txt, "+" );
 334         strcat( txt, "DEBUG" );
 335 #endif
 336 #ifdef SNIFFER
 337         if( txt[0] ) strcat( txt, "+" );
 338         strcat( txt, "SNIFFER" );
 339 #endif
 340
 341         if( txt[0] ) strcat( txt, "-" );
 342 #ifdef PROTOTYPES
 343         strcat( txt, TARGET_CPU"/"TARGET_VENDOR"/"TARGET_OS );
 344 #else
 345         strcat( txt, TARGET_CPU );
 346         strcat( txt, "/" );
 347         strcat( txt, TARGET_VENDOR );
 348         strcat( txt, "/" );
 349         strcat( txt, TARGET_OS );
 350 #endif
 351
 352         return txt;
 353 } /* NGIRCd_VersionAddition */
 354
 355
 356 LOCAL VOID
 357 Initialize_Signal_Handler( VOID )
 358 {
 359         /* Signal-Handler initialisieren: einige Signale
 360          * werden ignoriert, andere speziell behandelt. */
 361
 362 #ifdef HAVE_SIGACTION
 363         /* sigaction() ist vorhanden */
 364
 365         struct sigaction saction;
 366
 367         /* Signal-Struktur initialisieren */
 368         memset( &saction, 0, sizeof( saction ));
 369         saction.sa_handler = Signal_Handler;
 370 #ifdef SA_RESTART
 371         saction.sa_flags |= SA_RESTART;
 372 #endif
 373 #ifdef SA_NOCLDWAIT
 374         saction.sa_flags |= SA_NOCLDWAIT;
 375 #endif
 376
 377         /* Signal-Handler einhaengen */
 378         sigaction( SIGINT, &saction, NULL );
 379         sigaction( SIGQUIT, &saction, NULL );
 380         sigaction( SIGTERM, &saction, NULL);
 381         sigaction( SIGHUP, &saction, NULL);
 382         sigaction( SIGCHLD, &saction, NULL);
 383
 384         /* einige Signale ignorieren */
 385         saction.sa_handler = SIG_IGN;
 386         sigaction( SIGPIPE, &saction, NULL );
 387 #else
 388         /* kein sigaction() vorhanden */
 389
 390         /* Signal-Handler einhaengen */
 391         signal( SIGINT, Signal_Handler );
 392         signal( SIGQUIT, Signal_Handler );
 393         signal( SIGTERM, Signal_Handler );
 394         signal( SIGHUP, Signal_Handler );
 395         signal( SIGCHLD, Signal_Handler );
 396
 397         /* einige Signale ignorieren */
 398         signal( SIGPIPE, SIG_IGN );
 399 #endif
 400 } /* Initialize_Signal_Handler */
 401
 402
 403 LOCAL VOID
 404 Signal_Handler( INT Signal )
 405 {
 406         /* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
 407          * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
 408          * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
 409
 410         switch( Signal )
 411         {
 412                 case SIGTERM:
 413                 case SIGINT:
 414                 case SIGQUIT:
 415                         /* wir soll(t)en uns wohl beenden ... */
 416                         if( Signal == SIGTERM ) Log( LOG_WARNING, "Got TERM signal, terminating now ..." );
 417                         else if( Signal == SIGINT ) Log( LOG_WARNING, "Got INT signal, terminating now ..." );
 418                         else if( Signal == SIGQUIT ) Log( LOG_WARNING, "Got QUIT signal, terminating now ..." );
 419                         NGIRCd_Quit = TRUE;
 420                         break;
 421                 case SIGHUP:
 422                         /* neu starten */
 423                         Log( LOG_WARNING, "Got HUP signal, restarting now ..." );
 424                         NGIRCd_Restart = TRUE;
 425                         break;
 426                 case SIGCHLD:
 427                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 428                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 429                         break;
 430                 default:
 431                         /* unbekanntes bzw. unbehandeltes Signal */
 432                         Log( LOG_NOTICE, "Got signal %d! Ignored.", Signal );
 433         }
 434 } /* Signal_Handler */
 435
 436
 437 LOCAL VOID
 438 Initialize_Listen_Ports( VOID )
 439 {
 440         /* Ports, auf denen der Server Verbindungen entgegennehmen
 441          * soll, initialisieren */
 442
 443         UINT created, i;
 444
 445         created = 0;
 446         for( i = 0; i < Conf_ListenPorts_Count; i++ )
 447         {
 448                 if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
 449                 else Log( LOG_ERR, "Can't listen on port %u!", Conf_ListenPorts[i] );
 450         }
 451
 452         if( created < 1 )
 453         {
 454                 Log( LOG_ALERT, "Server isn't listening on a single port!" );
 455                 Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
 456                 exit( 1 );
 457         }
 458 } /* Initialize_Listen_Ports */
 459
 460
 461 LOCAL VOID
 462 Show_Version( VOID )
 463 {
 464         puts( NGIRCd_Version( ));
 465         puts( "Copyright (c)2001,2002 by Alexander Barton (<alex@barton.de>)." );
 466         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 467         puts( "This is free software; see the source for copying conditions. There is NO" );
 468         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 469 } /* Show_Version */
 470
 471
 472 LOCAL VOID
 473 Show_Help( VOID )
 474 {
 475 #ifdef DEBUG
 476         puts( "  -d, --debug        log extra debug messages" );
 477 #endif
 478         puts( "  -f, --config <f>   use file <f> as configuration file" );
 479         puts( "  -n, --nodaemon     don't fork and don't detatch from controlling terminal" );
 480         puts( "  -p, --passive      disable automatic connections to other servers" );
 481 #ifdef SNIFFER
 482         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 483 #endif
 484         puts( "      --configtest   read, validate and display configuration; then exit" );
 485         puts( "      --version      output version information and exit" );
 486         puts( "      --help         display this help and exit" );
 487 } /* Show_Help */
 488
 489
 490 /* -eof- */