src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2005 by 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 static char UNUSED id[] = "$Id: ngircd.c,v 1.109 2005/08/25 08:48:43 alex Exp $";
  16
  17 /**
  18  * @file
  19  * The main program, including the C function main() which is called
  20  * by the loader of the operating system.
  21  */
  22
  23 #include "imp.h"
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <sys/wait.h>
  35 #include <fcntl.h>
  36 #include <pwd.h>
  37 #include <grp.h>
  38
  39 #include "defines.h"
  40 #include "resolve.h"
  41 #include "conn.h"
  42 #include "client.h"
  43 #include "channel.h"
  44 #include "conf.h"
  45 #include "cvs-version.h"
  46 #include "lists.h"
  47 #include "log.h"
  48 #include "parse.h"
  49 #include "irc.h"
  50
  51 #ifdef ZEROCONF
  52 #include "rendezvous.h"
  53 #endif
  54
  55 #include "exp.h"
  56 #include "ngircd.h"
  57
  58
  59 static void Initialize_Signal_Handler PARAMS(( void ));
  60 static void Signal_Handler PARAMS(( int Signal ));
  61
  62 static void Show_Version PARAMS(( void ));
  63 static void Show_Help PARAMS(( void ));
  64
  65 static void Pidfile_Create PARAMS(( long ));
  66 static void Pidfile_Delete PARAMS(( void ));
  67
  68 static void Fill_Version PARAMS(( void ));
  69
  70 static void Setup_FDStreams PARAMS(( void ));
  71
  72 static bool NGIRCd_Init PARAMS(( bool ));
  73
  74 /**
  75  * The main() function of ngIRCd.
  76  * Here all starts: this function is called by the operating system loader,
  77  * it is the first portion of code executed of ngIRCd.
  78  * @param argc The number of arguments passed to ngIRCd on the command line.
  79  * @param argv An array containing all the arguments passed to ngIRCd.
  80  * @return Global exit code of ngIRCd, zero on success.
  81  */
  82 GLOBAL int
  83 main( int argc, const char *argv[] )
  84 {
  85         bool ok, configtest = false;
  86         bool NGIRCd_NoDaemon = false;
  87         int i;
  88         size_t n;
  89
  90         umask( 0077 );
  91
  92         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
  93         NGIRCd_Passive = false;
  94 #ifdef DEBUG
  95         NGIRCd_Debug = false;
  96 #endif
  97 #ifdef SNIFFER
  98         NGIRCd_Sniffer = false;
  99 #endif
 100         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 101         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 102
 103         Fill_Version( );
 104
 105         /* Kommandozeile parsen */
 106         for( i = 1; i < argc; i++ )
 107         {
 108                 ok = false;
 109                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 110                 {
 111                         /* Lange Option */
 112
 113                         if( strcmp( argv[i], "--config" ) == 0 )
 114                         {
 115                                 if( i + 1 < argc )
 116                                 {
 117                                         /* Ok, there's an parameter left */
 118                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 119
 120                                         /* next parameter */
 121                                         i++; ok = true;
 122                                 }
 123                         }
 124                         if( strcmp( argv[i], "--configtest" ) == 0 )
 125                         {
 126                                 configtest = true;
 127                                 ok = true;
 128                         }
 129 #ifdef DEBUG
 130                         if( strcmp( argv[i], "--debug" ) == 0 )
 131                         {
 132                                 NGIRCd_Debug = true;
 133                                 ok = true;
 134                         }
 135 #endif
 136                         if( strcmp( argv[i], "--help" ) == 0 )
 137                         {
 138                                 Show_Version( );
 139                                 puts( "" ); Show_Help( ); puts( "" );
 140                                 exit( 1 );
 141                         }
 142                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 143                         {
 144                                 NGIRCd_NoDaemon = true;
 145                                 ok = true;
 146                         }
 147                         if( strcmp( argv[i], "--passive" ) == 0 )
 148                         {
 149                                 NGIRCd_Passive = true;
 150                                 ok = true;
 151                         }
 152 #ifdef SNIFFER
 153                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 154                         {
 155                                 NGIRCd_Sniffer = true;
 156                                 ok = true;
 157                         }
 158 #endif
 159                         if( strcmp( argv[i], "--version" ) == 0 )
 160                         {
 161                                 Show_Version( );
 162                                 exit( 1 );
 163                         }
 164                 }
 165                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 166                 {
 167                         /* Kurze Option */
 168                         for( n = 1; n < strlen( argv[i] ); n++ )
 169                         {
 170                                 ok = false;
 171 #ifdef DEBUG
 172                                 if( argv[i][n] == 'd' )
 173                                 {
 174                                         NGIRCd_Debug = true;
 175                                         ok = true;
 176                                 }
 177 #endif
 178                                 if( argv[i][n] == 'f' )
 179                                 {
 180                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 181                                         {
 182                                                 /* Ok, next character is a blank */
 183                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 184
 185                                                 /* go to the following parameter */
 186                                                 i++;
 187                                                 n = strlen( argv[i] );
 188                                                 ok = true;
 189                                         }
 190                                 }
 191                                 if( argv[i][n] == 'n' )
 192                                 {
 193                                         NGIRCd_NoDaemon = true;
 194                                         ok = true;
 195                                 }
 196                                 if( argv[i][n] == 'p' )
 197                                 {
 198                                         NGIRCd_Passive = true;
 199                                         ok = true;
 200                                 }
 201 #ifdef SNIFFER
 202                                 if( argv[i][n] == 's' )
 203                                 {
 204                                         NGIRCd_Sniffer = true;
 205                                         ok = true;
 206                                 }
 207 #endif
 208                                 if( argv[i][n] == 't' )
 209                                 {
 210                                         configtest = true;
 211                                         ok = true;
 212                                 }
 213
 214                                 if( ! ok )
 215                                 {
 216                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 217                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 218                                         exit( 1 );
 219                                 }
 220                         }
 221
 222                 }
 223                 if( ! ok )
 224                 {
 225                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 226                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 227                         exit( 1 );
 228                 }
 229         }
 230
 231         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 232         NGIRCd_DebugLevel[0] = '\0';
 233 #ifdef DEBUG
 234         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 235 #endif
 236 #ifdef SNIFFER
 237         if( NGIRCd_Sniffer )
 238         {
 239                 NGIRCd_Debug = true;
 240                 strcpy( NGIRCd_DebugLevel, "2" );
 241         }
 242 #endif
 243
 244         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 245         if( configtest )
 246         {
 247                 Show_Version( ); puts( "" );
 248                 exit( Conf_Test( ));
 249         }
 250
 251         while( ! NGIRCd_SignalQuit )
 252         {
 253                 /* Initialize global variables */
 254                 NGIRCd_Start = time( NULL );
 255                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 256
 257                 NGIRCd_SignalRehash = false;
 258                 NGIRCd_SignalRestart = false;
 259                 NGIRCd_SignalQuit = false;
 260
 261                 /* Initialize modules, part I */
 262                 Log_Init( ! NGIRCd_NoDaemon );
 263                 Conf_Init( );
 264
 265                 /* Initialize the "main program": chroot environment, user and
 266                  * group ID, ... */
 267                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 268                         Log(LOG_ALERT, "Fatal: Initialization failed");
 269                         exit(1);
 270                 }
 271
 272                 /* Initialize modules, part II: these functions are eventually
 273                  * called with already dropped privileges ... */
 274                 Lists_Init( );
 275                 Channel_Init( );
 276                 Client_Init( );
 277 #ifdef ZEROCONF
 278                 Rendezvous_Init( );
 279 #endif
 280                 Conn_Init( );
 281
 282 #ifdef DEBUG
 283                 /* Redirect stderr handle to "error file" for debugging
 284                  * when not running in "no daemon" mode: */
 285                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 286 #endif
 287
 288                 /* Signal-Handler initialisieren */
 289                 Initialize_Signal_Handler( );
 290
 291                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 292                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 293                  * sind in doc/Protocol.txt beschrieben. */
 294 #ifdef IRCPLUS
 295                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 296 #ifdef ZLIB
 297                 strcat( NGIRCd_ProtoID, "Z" );
 298 #endif
 299                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 300 #else
 301                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 302 #endif
 303                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 304 #ifdef ZLIB
 305                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 306 #endif
 307                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 308
 309                 /* Vordefinierte Channels anlegen */
 310                 Channel_InitPredefined( );
 311
 312                 /* Listen-Ports initialisieren */
 313                 if( Conn_InitListeners( ) < 1 )
 314                 {
 315                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 316                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 317                         Pidfile_Delete( );
 318                         exit( 1 );
 319                 }
 320
 321                 /* Hauptschleife */
 322                 Conn_Handler( );
 323
 324                 /* Alles abmelden */
 325                 Conn_Exit( );
 326 #ifdef ZEROCONF
 327                 Rendezvous_Exit( );
 328 #endif
 329                 Client_Exit( );
 330                 Channel_Exit( );
 331                 Lists_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
 403         if( NGIRCd_VersionAddition[0] )
 404                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 405
 406         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 407         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 408         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 409         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 410         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 411
 412 #ifdef CVSDATE
 413         snprintf( NGIRCd_Version, sizeof NGIRCd_Version,"%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition);
 414 #else
 415         snprintf( NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 416 #endif
 417 } /* Fill_Version */
 418
 419
 420 /**
 421  * Reload the server configuration file.
 422  */
 423 GLOBAL void
 424 NGIRCd_Rehash( void )
 425 {
 426         char old_name[CLIENT_ID_LEN];
 427
 428         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 429         NGIRCd_SignalRehash = false;
 430
 431         /* Close down all listening sockets */
 432         Conn_ExitListeners( );
 433
 434         /* Remember old server name */
 435         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 436
 437         /* Re-read configuration ... */
 438         Conf_Rehash( );
 439
 440         /* Recover old server name: it can't be changed during run-time */
 441         if( strcmp( old_name, Conf_ServerName ) != 0 )
 442         {
 443                 strlcpy( Conf_ServerName, old_name, sizeof Conf_ServerName );
 444                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 445         }
 446
 447         /* Create new pre-defined channels */
 448         Channel_InitPredefined( );
 449
 450         /* Start listening on sockets */
 451         Conn_InitListeners( );
 452
 453         /* Sync configuration with established connections */
 454         Conn_SyncServerStruct( );
 455
 456         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 457 } /* NGIRCd_Rehash */
 458
 459
 460 /**
 461  * Initialize the signal handler.
 462  */
 463 static void
 464 Initialize_Signal_Handler( void )
 465 {
 466         /* Signal-Handler initialisieren: einige Signale
 467          * werden ignoriert, andere speziell behandelt. */
 468
 469 #ifdef HAVE_SIGACTION
 470         /* sigaction() ist vorhanden */
 471
 472         struct sigaction saction;
 473
 474         /* Signal-Struktur initialisieren */
 475         memset( &saction, 0, sizeof( saction ));
 476         saction.sa_handler = Signal_Handler;
 477 #ifdef SA_RESTART
 478         saction.sa_flags |= SA_RESTART;
 479 #endif
 480 #ifdef SA_NOCLDWAIT
 481         saction.sa_flags |= SA_NOCLDWAIT;
 482 #endif
 483
 484         /* Signal-Handler einhaengen */
 485         sigaction( SIGINT, &saction, NULL );
 486         sigaction( SIGQUIT, &saction, NULL );
 487         sigaction( SIGTERM, &saction, NULL);
 488         sigaction( SIGHUP, &saction, NULL);
 489         sigaction( SIGCHLD, &saction, NULL);
 490
 491         /* einige Signale ignorieren */
 492         saction.sa_handler = SIG_IGN;
 493         sigaction( SIGPIPE, &saction, NULL );
 494 #else
 495         /* kein sigaction() vorhanden */
 496
 497         /* Signal-Handler einhaengen */
 498         signal( SIGINT, Signal_Handler );
 499         signal( SIGQUIT, Signal_Handler );
 500         signal( SIGTERM, Signal_Handler );
 501         signal( SIGHUP, Signal_Handler );
 502         signal( SIGCHLD, Signal_Handler );
 503
 504         /* einige Signale ignorieren */
 505         signal( SIGPIPE, SIG_IGN );
 506 #endif
 507 } /* Initialize_Signal_Handler */
 508
 509
 510 /**
 511  * Signal handler of ngIRCd.
 512  * This function is called whenever ngIRCd catches a signal sent by the
 513  * user and/or the system to it. For example SIGTERM and SIGHUP.
 514  * @param Signal Number of the signal to handle.
 515  */
 516 static void
 517 Signal_Handler( int Signal )
 518 {
 519         switch( Signal )
 520         {
 521                 case SIGTERM:
 522                 case SIGINT:
 523                 case SIGQUIT:
 524                         /* wir soll(t)en uns wohl beenden ... */
 525                         NGIRCd_SignalQuit = true;
 526                         break;
 527                 case SIGHUP:
 528                         /* Konfiguration neu einlesen: */
 529                         NGIRCd_SignalRehash = true;
 530                         break;
 531                 case SIGCHLD:
 532                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 533                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 534                         break;
 535 #ifdef DEBUG
 536                 default:
 537                         /* unbekanntes bzw. unbehandeltes Signal */
 538                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 539 #endif
 540         }
 541 } /* Signal_Handler */
 542
 543
 544 /**
 545  * Display copyright and version information of ngIRCd on the console.
 546  */
 547 static void
 548 Show_Version( void )
 549 {
 550         puts( NGIRCd_Version );
 551         puts( "Copyright (c)2001-2005 by Alexander Barton (<alex@barton.de>)." );
 552         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 553         puts( "This is free software; see the source for copying conditions. There is NO" );
 554         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 555 } /* Show_Version */
 556
 557
 558 /**
 559  * Display a short help text on the console.
 560  * This help depends on the configuration of the executable and only shows
 561  * options that are actually enabled.
 562  */
 563 static void
 564 Show_Help( void )
 565 {
 566 #ifdef DEBUG
 567         puts( "  -d, --debug        log extra debug messages" );
 568 #endif
 569         puts( "  -f, --config <f>   use file <f> as configuration file" );
 570         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 571         puts( "  -p, --passive      disable automatic connections to other servers" );
 572 #ifdef SNIFFER
 573         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 574 #endif
 575         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 576         puts( "      --version      output version information and exit" );
 577         puts( "      --help         display this help and exit" );
 578 } /* Show_Help */
 579
 580
 581 /**
 582  * Delete the file containing the process ID (PID).
 583  */
 584 static void
 585 Pidfile_Delete( void )
 586 {
 587         /* Pidfile configured? */
 588         if( ! Conf_PidFile[0] ) return;
 589
 590 #ifdef DEBUG
 591         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 592 #endif
 593
 594         if( unlink( Conf_PidFile ))
 595                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 596 } /* Pidfile_Delete */
 597
 598
 599 /**
 600  * Create the file containing the process ID of ngIRCd ("PID file").
 601  * @param pid The process ID to be stored in this file.
 602  */
 603 static void
 604 Pidfile_Create( long pid )
 605 {
 606         int pidfd;
 607         char pidbuf[64];
 608         int len;
 609
 610         /* Pidfile configured? */
 611         if( ! Conf_PidFile[0] ) return;
 612
 613 #ifdef DEBUG
 614         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 615 #endif
 616
 617         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 618         if ( pidfd < 0 ) {
 619                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 620                 return;
 621         }
 622
 623         len = snprintf( pidbuf, sizeof pidbuf, "%ld\n", pid );
 624         if (len < 0|| len < (int)sizeof pid) {
 625                 Log( LOG_ERR, "Error converting pid");
 626                 return;
 627         }
 628
 629         if( write( pidfd, pidbuf, len) != len)
 630                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 631
 632         if( close(pidfd) != 0 )
 633                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 634 } /* Pidfile_Create */
 635
 636
 637 /**
 638  * Redirect stdin, stdout and stderr to apropriate file handles.
 639  */
 640 static void
 641 Setup_FDStreams( void )
 642 {
 643         int fd;
 644
 645         /* Test if we can open /dev/null for reading and writing. If not
 646          * we are most probably chrooted already and the server has been
 647          * restarted. So we simply don't try to redirect stdXXX ... */
 648         fd = open( "/dev/null", O_RDWR );
 649         if ( fd < 0 ) {
 650                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 651                 return;
 652         }
 653
 654         fflush(stdout);
 655         fflush(stderr);
 656
 657         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 658         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 659
 660         /* Close newly opened file descriptor if not stdin/out/err */
 661         if( fd > 2 ) close( fd );
 662 } /* Setup_FDStreams */
 663
 664
 665 static bool
 666 NGIRCd_getNobodyID(unsigned int *uid, unsigned int *gid )
 667 {
 668         struct passwd *pwd;
 669
 670         pwd = getpwnam("nobody");
 671         if (!pwd) return false;
 672
 673         if ( !pwd->pw_uid || !pwd->pw_gid)
 674                 return false;
 675
 676         *uid = pwd->pw_uid;
 677         *gid = pwd->pw_gid;
 678         endpwent();
 679
 680         return true;
 681 }
 682
 683
 684 static bool
 685 NGIRCd_Init( bool NGIRCd_NoDaemon )
 686 {
 687         static bool initialized;
 688         bool chrooted = false;
 689         struct passwd *pwd;
 690         struct group *grp;
 691         int real_errno;
 692         long pid;
 693
 694         if (initialized)
 695                 return true;
 696
 697         if( Conf_Chroot[0] ) {
 698                 if( chdir( Conf_Chroot ) != 0 ) {
 699                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 700                         return false;
 701                 }
 702
 703                 if( chroot( Conf_Chroot ) != 0 ) {
 704                         if (errno != EPERM) {
 705                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 706                                                                 Conf_Chroot, strerror( errno ));
 707
 708                                 return false;
 709                         }
 710                 } else {
 711                         chrooted = true;
 712                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 713                 }
 714         }
 715
 716         if (Conf_UID == 0) {
 717                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 718
 719                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 720                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 721                                         errno ? strerror(errno) : "not found" );
 722                         return false;
 723                 }
 724         }
 725
 726         if (getgid() != Conf_GID) {
 727                 /* Change group ID */
 728                 if (setgid(Conf_GID) != 0) {
 729                         real_errno = errno;
 730                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 731                         if (real_errno != EPERM)
 732                                 return false;
 733                 }
 734         }
 735
 736         if (getuid() != Conf_UID) {
 737                 /* Change user ID */
 738                 if (setuid(Conf_UID) != 0) {
 739                         real_errno = errno;
 740                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 741                         if (real_errno != EPERM)
 742                                 return false;
 743                 }
 744         }
 745
 746         initialized = true;
 747
 748         /* Normally a child process is forked which isn't any longer
 749          * connected to ther controlling terminal. Use "--nodaemon"
 750          * to disable this "daemon mode" (useful for debugging). */
 751         if ( ! NGIRCd_NoDaemon ) {
 752                 pid = (long)fork( );
 753                 if( pid > 0 ) {
 754                         /* "Old" process: exit. */
 755                         exit( 0 );
 756                 }
 757                 if( pid < 0 ) {
 758                         /* Error!? */
 759                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 760                                                                 PACKAGE_NAME, strerror( errno ));
 761                         exit( 1 );
 762                 }
 763
 764                 /* New child process */
 765                 (void)setsid( );
 766                 chdir( "/" );
 767
 768                 /* Detach stdin, stdout and stderr */
 769                 Setup_FDStreams( );
 770         }
 771         pid = getpid();
 772
 773         Pidfile_Create( pid );
 774
 775         /* Check UID/GID we are running as, can be different from values
 776          * configured (e. g. if we were already started with a UID>0. */
 777         Conf_UID = getuid();
 778         Conf_GID = getgid();
 779
 780         pwd = getpwuid( Conf_UID );
 781         grp = getgrgid( Conf_GID );
 782
 783         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 784                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
 785                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
 786
 787         if ( chrooted ) {
 788                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
 789                 return true;
 790         } else {
 791                 Log( LOG_INFO, "Not running chrooted." );
 792         }
 793
 794         /* Change working directory to home directory of the user
 795          * we are running as (only when running in daemon mode and not in chroot) */
 796
 797         if ( pwd ) {
 798                 if (!NGIRCd_NoDaemon ) {
 799                         if( chdir( pwd->pw_dir ) == 0 )
 800                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 801                         else
 802                                 Log( LOG_ERR, "Can't change working directory to \"%s\": %s",
 803                                                                 pwd->pw_dir, strerror( errno ));
 804                 }
 805         } else {
 806                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 807         }
 808
 809 return true;
 810 }
 811
 812 /* -eof- */