src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2008 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
  12
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * The main program, including the C function main() which is called
  18  * by the loader of the operating system.
  19  */
  20
  21 #include "imp.h"
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34 #include <pwd.h>
  35 #include <grp.h>
  36
  37 #include "defines.h"
  38 #include "resolve.h"
  39 #include "conn.h"
  40 #include "client.h"
  41 #include "channel.h"
  42 #include "conf.h"
  43 #include "lists.h"
  44 #include "log.h"
  45 #include "parse.h"
  46 #include "irc.h"
  47
  48 #ifdef ZEROCONF
  49 #include "rendezvous.h"
  50 #endif
  51
  52 #include "exp.h"
  53 #include "ngircd.h"
  54
  55
  56 static void Initialize_Signal_Handler PARAMS(( void ));
  57 static void Signal_Handler PARAMS(( int Signal ));
  58
  59 static void Show_Version PARAMS(( void ));
  60 static void Show_Help PARAMS(( void ));
  61
  62 static void Pidfile_Create PARAMS(( pid_t pid ));
  63 static void Pidfile_Delete PARAMS(( void ));
  64
  65 static void Fill_Version PARAMS(( void ));
  66
  67 static void Setup_FDStreams PARAMS(( void ));
  68
  69 static bool NGIRCd_Init PARAMS(( bool ));
  70
  71 /**
  72  * The main() function of ngIRCd.
  73  * Here all starts: this function is called by the operating system loader,
  74  * it is the first portion of code executed of ngIRCd.
  75  * @param argc The number of arguments passed to ngIRCd on the command line.
  76  * @param argv An array containing all the arguments passed to ngIRCd.
  77  * @return Global exit code of ngIRCd, zero on success.
  78  */
  79 GLOBAL int
  80 main( int argc, const char *argv[] )
  81 {
  82         bool ok, configtest = false;
  83         bool NGIRCd_NoDaemon = false;
  84         int i;
  85         size_t n;
  86
  87         umask( 0077 );
  88
  89         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
  90         NGIRCd_Passive = false;
  91 #ifdef DEBUG
  92         NGIRCd_Debug = false;
  93 #endif
  94 #ifdef SNIFFER
  95         NGIRCd_Sniffer = false;
  96 #endif
  97         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
  98         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
  99
 100         Fill_Version( );
 101
 102         /* Kommandozeile parsen */
 103         for( i = 1; i < argc; i++ )
 104         {
 105                 ok = false;
 106                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 107                 {
 108                         /* Lange Option */
 109
 110                         if( strcmp( argv[i], "--config" ) == 0 )
 111                         {
 112                                 if( i + 1 < argc )
 113                                 {
 114                                         /* Ok, there's an parameter left */
 115                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 116
 117                                         /* next parameter */
 118                                         i++; ok = true;
 119                                 }
 120                         }
 121                         if( strcmp( argv[i], "--configtest" ) == 0 )
 122                         {
 123                                 configtest = true;
 124                                 ok = true;
 125                         }
 126 #ifdef DEBUG
 127                         if( strcmp( argv[i], "--debug" ) == 0 )
 128                         {
 129                                 NGIRCd_Debug = true;
 130                                 ok = true;
 131                         }
 132 #endif
 133                         if( strcmp( argv[i], "--help" ) == 0 )
 134                         {
 135                                 Show_Version( );
 136                                 puts( "" ); Show_Help( ); puts( "" );
 137                                 exit( 1 );
 138                         }
 139                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 140                         {
 141                                 NGIRCd_NoDaemon = true;
 142                                 ok = true;
 143                         }
 144                         if( strcmp( argv[i], "--passive" ) == 0 )
 145                         {
 146                                 NGIRCd_Passive = true;
 147                                 ok = true;
 148                         }
 149 #ifdef SNIFFER
 150                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 151                         {
 152                                 NGIRCd_Sniffer = true;
 153                                 ok = true;
 154                         }
 155 #endif
 156                         if( strcmp( argv[i], "--version" ) == 0 )
 157                         {
 158                                 Show_Version( );
 159                                 exit( 1 );
 160                         }
 161                 }
 162                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 163                 {
 164                         /* Kurze Option */
 165                         for( n = 1; n < strlen( argv[i] ); n++ )
 166                         {
 167                                 ok = false;
 168 #ifdef DEBUG
 169                                 if (argv[i][n] == 'd') {
 170                                         NGIRCd_Debug = true;
 171                                         ok = true;
 172                                 }
 173 #endif
 174                                 if (argv[i][n] == 'f') {
 175                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 176                                         {
 177                                                 /* Ok, next character is a blank */
 178                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 179
 180                                                 /* go to the following parameter */
 181                                                 i++;
 182                                                 n = strlen( argv[i] );
 183                                                 ok = true;
 184                                         }
 185                                 }
 186
 187                                 if (argv[i][n] == 'h') {
 188                                         Show_Version();
 189                                         puts(""); Show_Help(); puts("");
 190                                         exit(1);
 191                                 }
 192
 193                                 if (argv[i][n] == 'n') {
 194                                         NGIRCd_NoDaemon = true;
 195                                         ok = true;
 196                                 }
 197                                 if (argv[i][n] == 'p') {
 198                                         NGIRCd_Passive = true;
 199                                         ok = true;
 200                                 }
 201 #ifdef SNIFFER
 202                                 if (argv[i][n] == 's') {
 203                                         NGIRCd_Sniffer = true;
 204                                         ok = true;
 205                                 }
 206 #endif
 207                                 if (argv[i][n] == 't') {
 208                                         configtest = true;
 209                                         ok = true;
 210                                 }
 211
 212                                 if (argv[i][n] == 'V') {
 213                                         Show_Version();
 214                                         exit(1);
 215                                 }
 216
 217                                 if (! ok) {
 218                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 219                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 220                                         exit( 1 );
 221                                 }
 222                         }
 223
 224                 }
 225                 if( ! ok )
 226                 {
 227                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 228                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 229                         exit( 1 );
 230                 }
 231         }
 232
 233         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 234         NGIRCd_DebugLevel[0] = '\0';
 235 #ifdef DEBUG
 236         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 237 #endif
 238 #ifdef SNIFFER
 239         if( NGIRCd_Sniffer )
 240         {
 241                 NGIRCd_Debug = true;
 242                 strcpy( NGIRCd_DebugLevel, "2" );
 243         }
 244 #endif
 245
 246         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 247         if( configtest )
 248         {
 249                 Show_Version( ); puts( "" );
 250                 exit( Conf_Test( ));
 251         }
 252
 253         while( ! NGIRCd_SignalQuit )
 254         {
 255                 /* Initialize global variables */
 256                 NGIRCd_Start = time( NULL );
 257                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 258
 259                 NGIRCd_SignalRehash = false;
 260                 NGIRCd_SignalRestart = false;
 261                 NGIRCd_SignalQuit = false;
 262
 263                 /* Initialize modules, part I */
 264                 Log_Init( ! NGIRCd_NoDaemon );
 265                 Conf_Init( );
 266
 267                 /* Initialize the "main program": chroot environment, user and
 268                  * group ID, ... */
 269                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 270                         Log(LOG_ALERT, "Fatal: Initialization failed");
 271                         exit(1);
 272                 }
 273
 274                 /* Initialize modules, part II: these functions are eventually
 275                  * called with already dropped privileges ... */
 276                 Channel_Init( );
 277                 Client_Init( );
 278 #ifdef ZEROCONF
 279                 Rendezvous_Init( );
 280 #endif
 281                 Conn_Init( );
 282
 283 #ifdef DEBUG
 284                 /* Redirect stderr handle to "error file" for debugging
 285                  * when not running in "no daemon" mode: */
 286                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 287 #endif
 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                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 297 #ifdef ZLIB
 298                 strcat( NGIRCd_ProtoID, "Z" );
 299 #endif
 300                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 301 #else
 302                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 303 #endif
 304                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 305 #ifdef ZLIB
 306                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 307 #endif
 308                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 309
 310                 /* Vordefinierte Channels anlegen */
 311                 Channel_InitPredefined( );
 312
 313                 /* Listen-Ports initialisieren */
 314                 if( Conn_InitListeners( ) < 1 )
 315                 {
 316                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 317                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 318                         Pidfile_Delete( );
 319                         exit( 1 );
 320                 }
 321
 322                 /* Hauptschleife */
 323                 Conn_Handler( );
 324
 325                 /* Alles abmelden */
 326                 Conn_Exit( );
 327 #ifdef ZEROCONF
 328                 Rendezvous_Exit( );
 329 #endif
 330                 Client_Exit( );
 331                 Channel_Exit( );
 332                 Log_Exit( );
 333         }
 334         Pidfile_Delete( );
 335
 336         return 0;
 337 } /* main */
 338
 339
 340 /**
 341  * Generate ngIRCd "version string".
 342  * This string is generated once and then stored in NGIRCd_Version for
 343  * further usage, for example by the IRC command VERSION and the --version
 344  * command line switch.
 345  */
 346 static void
 347 Fill_Version( void )
 348 {
 349         NGIRCd_VersionAddition[0] = '\0';
 350
 351 #ifdef SYSLOG
 352         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 353 #endif
 354 #ifdef ZLIB
 355         if( NGIRCd_VersionAddition[0] )
 356                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 357
 358         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 359 #endif
 360 #ifdef TCPWRAP
 361         if( NGIRCd_VersionAddition[0] )
 362                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 363
 364         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 365 #endif
 366 #ifdef ZEROCONF
 367         if( NGIRCd_VersionAddition[0] )
 368                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 369
 370         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 371 #endif
 372 #ifdef IDENTAUTH
 373         if( NGIRCd_VersionAddition[0] )
 374                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 375
 376         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 377 #endif
 378 #ifdef DEBUG
 379         if( NGIRCd_VersionAddition[0] )
 380                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 381
 382         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 383 #endif
 384 #ifdef SNIFFER
 385         if( NGIRCd_VersionAddition[0] )
 386                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 387
 388         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 389 #endif
 390 #ifdef STRICT_RFC
 391         if( NGIRCd_VersionAddition[0] )
 392                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 393
 394         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 395 #endif
 396 #ifdef IRCPLUS
 397         if( NGIRCd_VersionAddition[0] )
 398                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 399
 400         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 401 #endif
 402 #ifdef WANT_IPV6
 403         if (NGIRCd_VersionAddition[0])
 404                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 405
 406         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 407 #endif
 408         if( NGIRCd_VersionAddition[0] )
 409                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 410
 411         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 412         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 413         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 414         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 415         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 416
 417         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 418                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 419         } /* Fill_Version */
 420
 421
 422 /**
 423  * Reload the server configuration file.
 424  */
 425 GLOBAL void
 426 NGIRCd_Rehash( void )
 427 {
 428         char old_name[CLIENT_ID_LEN];
 429         unsigned old_nicklen;
 430
 431         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 432         NGIRCd_SignalRehash = false;
 433
 434         /* Remember old server name and nick name length */
 435         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 436         old_nicklen = Conf_MaxNickLength;
 437
 438         /* Re-read configuration ... */
 439         if (!Conf_Rehash( ))
 440                 return;
 441
 442         /* Close down all listening sockets */
 443         Conn_ExitListeners( );
 444
 445         /* Recover old server name and nick name length: these values can't
 446          * be changed during run-time */
 447         if (strcmp(old_name, Conf_ServerName) != 0 ) {
 448                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
 449                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
 450         }
 451         if (old_nicklen != Conf_MaxNickLength) {
 452                 Conf_MaxNickLength = old_nicklen;
 453                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 454         }
 455
 456         /* Create new pre-defined channels */
 457         Channel_InitPredefined( );
 458
 459         /* Start listening on sockets */
 460         Conn_InitListeners( );
 461
 462         /* Sync configuration with established connections */
 463         Conn_SyncServerStruct( );
 464
 465         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 466 } /* NGIRCd_Rehash */
 467
 468
 469 /**
 470  * Initialize the signal handler.
 471  */
 472 static void
 473 Initialize_Signal_Handler( void )
 474 {
 475         /* Signal-Handler initialisieren: einige Signale
 476          * werden ignoriert, andere speziell behandelt. */
 477
 478 #ifdef HAVE_SIGACTION
 479         /* sigaction() ist vorhanden */
 480
 481         struct sigaction saction;
 482
 483         /* Signal-Struktur initialisieren */
 484         memset( &saction, 0, sizeof( saction ));
 485         saction.sa_handler = Signal_Handler;
 486 #ifdef SA_RESTART
 487         saction.sa_flags |= SA_RESTART;
 488 #endif
 489 #ifdef SA_NOCLDWAIT
 490         saction.sa_flags |= SA_NOCLDWAIT;
 491 #endif
 492
 493         /* Signal-Handler einhaengen */
 494         sigaction(SIGINT, &saction, NULL);
 495         sigaction(SIGQUIT, &saction, NULL);
 496         sigaction(SIGTERM, &saction, NULL);
 497         sigaction(SIGHUP, &saction, NULL);
 498         sigaction(SIGCHLD, &saction, NULL);
 499
 500         /* einige Signale ignorieren */
 501         saction.sa_handler = SIG_IGN;
 502         sigaction(SIGPIPE, &saction, NULL);
 503 #else
 504         /* kein sigaction() vorhanden */
 505
 506         /* Signal-Handler einhaengen */
 507         signal(SIGINT, Signal_Handler);
 508         signal(SIGQUIT, Signal_Handler);
 509         signal(SIGTERM, Signal_Handler);
 510         signal(SIGHUP, Signal_Handler);
 511         signal(SIGCHLD, Signal_Handler);
 512
 513         /* einige Signale ignorieren */
 514         signal(SIGPIPE, SIG_IGN);
 515 #endif
 516 } /* Initialize_Signal_Handler */
 517
 518
 519 /**
 520  * Signal handler of ngIRCd.
 521  * This function is called whenever ngIRCd catches a signal sent by the
 522  * user and/or the system to it. For example SIGTERM and SIGHUP.
 523  * @param Signal Number of the signal to handle.
 524  */
 525 static void
 526 Signal_Handler( int Signal )
 527 {
 528         switch( Signal )
 529         {
 530                 case SIGTERM:
 531                 case SIGINT:
 532                 case SIGQUIT:
 533                         /* wir soll(t)en uns wohl beenden ... */
 534                         NGIRCd_SignalQuit = true;
 535                         break;
 536                 case SIGHUP:
 537                         /* Konfiguration neu einlesen: */
 538                         NGIRCd_SignalRehash = true;
 539                         break;
 540                 case SIGCHLD:
 541                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 542                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 543                         break;
 544 #ifdef DEBUG
 545                 default:
 546                         /* unbekanntes bzw. unbehandeltes Signal */
 547                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 548 #endif
 549         }
 550 } /* Signal_Handler */
 551
 552
 553 /**
 554  * Display copyright and version information of ngIRCd on the console.
 555  */
 556 static void
 557 Show_Version( void )
 558 {
 559         puts( NGIRCd_Version );
 560         puts( "Copyright (c)2001-2008 Alexander Barton (<alex@barton.de>) and Contributors." );
 561         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 562         puts( "This is free software; see the source for copying conditions. There is NO" );
 563         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 564 } /* Show_Version */
 565
 566
 567 /**
 568  * Display a short help text on the console.
 569  * This help depends on the configuration of the executable and only shows
 570  * options that are actually enabled.
 571  */
 572 static void
 573 Show_Help( void )
 574 {
 575 #ifdef DEBUG
 576         puts( "  -d, --debug        log extra debug messages" );
 577 #endif
 578         puts( "  -f, --config <f>   use file <f> as configuration file" );
 579         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 580         puts( "  -p, --passive      disable automatic connections to other servers" );
 581 #ifdef SNIFFER
 582         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 583 #endif
 584         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 585         puts( "  -V, --version      output version information and exit" );
 586         puts( "  -h, --help         display this help and exit" );
 587 } /* Show_Help */
 588
 589
 590 /**
 591  * Delete the file containing the process ID (PID).
 592  */
 593 static void
 594 Pidfile_Delete( void )
 595 {
 596         /* Pidfile configured? */
 597         if( ! Conf_PidFile[0] ) return;
 598
 599 #ifdef DEBUG
 600         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 601 #endif
 602
 603         if( unlink( Conf_PidFile ))
 604                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 605 } /* Pidfile_Delete */
 606
 607
 608 /**
 609  * Create the file containing the process ID of ngIRCd ("PID file").
 610  * @param pid The process ID to be stored in this file.
 611  */
 612 static void
 613 Pidfile_Create(pid_t pid)
 614 {
 615         int pidfd;
 616         char pidbuf[64];
 617         int len;
 618
 619         /* Pidfile configured? */
 620         if( ! Conf_PidFile[0] ) return;
 621
 622 #ifdef DEBUG
 623         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 624 #endif
 625
 626         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 627         if ( pidfd < 0 ) {
 628                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 629                 return;
 630         }
 631
 632         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 633         if (len < 0 || len >= (int)sizeof pidbuf) {
 634                 Log( LOG_ERR, "Error converting pid");
 635                 return;
 636         }
 637
 638         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 639                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 640
 641         if( close(pidfd) != 0 )
 642                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 643 } /* Pidfile_Create */
 644
 645
 646 /**
 647  * Redirect stdin, stdout and stderr to apropriate file handles.
 648  */
 649 static void
 650 Setup_FDStreams( void )
 651 {
 652         int fd;
 653
 654         /* Test if we can open /dev/null for reading and writing. If not
 655          * we are most probably chrooted already and the server has been
 656          * restarted. So we simply don't try to redirect stdXXX ... */
 657         fd = open( "/dev/null", O_RDWR );
 658         if ( fd < 0 ) {
 659                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 660                 return;
 661         }
 662
 663         fflush(stdout);
 664         fflush(stderr);
 665
 666         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 667         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 668
 669         /* Close newly opened file descriptor if not stdin/out/err */
 670         if( fd > 2 ) close( fd );
 671 } /* Setup_FDStreams */
 672
 673
 674 static bool
 675 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 676 {
 677         struct passwd *pwd;
 678
 679 #ifdef __CYGWIN__
 680         /* Cygwin kludge.
 681          * It can return EINVAL instead of EPERM
 682          * so, if we are already unprivileged,
 683          * use id of current user.
 684          */
 685         if (geteuid() && getuid()) {
 686                 *uid = getuid();
 687                 *gid = getgid();
 688                 return true;
 689         }
 690 #endif
 691
 692         pwd = getpwnam("nobody");
 693         if (!pwd) return false;
 694
 695         if ( !pwd->pw_uid || !pwd->pw_gid)
 696                 return false;
 697
 698         *uid = pwd->pw_uid;
 699         *gid = pwd->pw_gid;
 700         endpwent();
 701
 702         return true;
 703 }
 704
 705
 706 static bool
 707 NGIRCd_Init( bool NGIRCd_NoDaemon )
 708 {
 709         static bool initialized;
 710         bool chrooted = false;
 711         struct passwd *pwd;
 712         struct group *grp;
 713         int real_errno;
 714         pid_t pid;
 715
 716         if (initialized)
 717                 return true;
 718
 719         if( Conf_Chroot[0] ) {
 720                 if( chdir( Conf_Chroot ) != 0 ) {
 721                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 722                         return false;
 723                 }
 724
 725                 if( chroot( Conf_Chroot ) != 0 ) {
 726                         if (errno != EPERM) {
 727                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 728                                                                 Conf_Chroot, strerror( errno ));
 729
 730                                 return false;
 731                         }
 732                 } else {
 733                         chrooted = true;
 734                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 735                 }
 736         }
 737
 738         if (Conf_UID == 0) {
 739                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 740
 741                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 742                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 743                                         errno ? strerror(errno) : "not found" );
 744                         return false;
 745                 }
 746         }
 747
 748         if (getgid() != Conf_GID) {
 749                 /* Change group ID */
 750                 if (setgid(Conf_GID) != 0) {
 751                         real_errno = errno;
 752                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 753                         if (real_errno != EPERM)
 754                                 return false;
 755                 }
 756         }
 757
 758         if (getuid() != Conf_UID) {
 759                 /* Change user ID */
 760                 if (setuid(Conf_UID) != 0) {
 761                         real_errno = errno;
 762                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 763                         if (real_errno != EPERM)
 764                                 return false;
 765                 }
 766         }
 767
 768         initialized = true;
 769
 770         /* Normally a child process is forked which isn't any longer
 771          * connected to ther controlling terminal. Use "--nodaemon"
 772          * to disable this "daemon mode" (useful for debugging). */
 773         if ( ! NGIRCd_NoDaemon ) {
 774                 pid = fork( );
 775                 if( pid > 0 ) {
 776                         /* "Old" process: exit. */
 777                         exit( 0 );
 778                 }
 779                 if( pid < 0 ) {
 780                         /* Error!? */
 781                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 782                                                                 PACKAGE_NAME, strerror( errno ));
 783                         exit( 1 );
 784                 }
 785
 786                 /* New child process */
 787                 (void)setsid( );
 788                 chdir( "/" );
 789
 790                 /* Detach stdin, stdout and stderr */
 791                 Setup_FDStreams( );
 792         }
 793         pid = getpid();
 794
 795         Pidfile_Create( pid );
 796
 797         /* Check UID/GID we are running as, can be different from values
 798          * configured (e. g. if we were already started with a UID>0. */
 799         Conf_UID = getuid();
 800         Conf_GID = getgid();
 801
 802         pwd = getpwuid( Conf_UID );
 803         grp = getgrgid( Conf_GID );
 804
 805         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 806                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
 807                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
 808
 809         if ( chrooted ) {
 810                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
 811                 return true;
 812         } else {
 813                 Log( LOG_INFO, "Not running chrooted." );
 814         }
 815
 816         /* Change working directory to home directory of the user
 817          * we are running as (only when running in daemon mode and not in chroot) */
 818
 819         if ( pwd ) {
 820                 if (!NGIRCd_NoDaemon ) {
 821                         if( chdir( pwd->pw_dir ) == 0 )
 822                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 823                         else
 824                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 825                                                                 pwd->pw_dir, strerror( errno ));
 826                 }
 827         } else {
 828                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 829         }
 830
 831 return true;
 832 }
 833
 834 /* -eof- */