src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2006 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 1.114 2006/12/07 17:57:20 fw 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(( pid_t pid ));
  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                 Channel_Init( );
 275                 Client_Init( );
 276 #ifdef ZEROCONF
 277                 Rendezvous_Init( );
 278 #endif
 279                 Conn_Init( );
 280
 281 #ifdef DEBUG
 282                 /* Redirect stderr handle to "error file" for debugging
 283                  * when not running in "no daemon" mode: */
 284                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 285 #endif
 286
 287                 /* Signal-Handler initialisieren */
 288                 Initialize_Signal_Handler( );
 289
 290                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 291                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 292                  * sind in doc/Protocol.txt beschrieben. */
 293 #ifdef IRCPLUS
 294                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 295 #ifdef ZLIB
 296                 strcat( NGIRCd_ProtoID, "Z" );
 297 #endif
 298                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 299 #else
 300                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 301 #endif
 302                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 303 #ifdef ZLIB
 304                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 305 #endif
 306                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 307
 308                 /* Vordefinierte Channels anlegen */
 309                 Channel_InitPredefined( );
 310
 311                 /* Listen-Ports initialisieren */
 312                 if( Conn_InitListeners( ) < 1 )
 313                 {
 314                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 315                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 316                         Pidfile_Delete( );
 317                         exit( 1 );
 318                 }
 319
 320                 /* Hauptschleife */
 321                 Conn_Handler( );
 322
 323                 /* Alles abmelden */
 324                 Conn_Exit( );
 325 #ifdef ZEROCONF
 326                 Rendezvous_Exit( );
 327 #endif
 328                 Client_Exit( );
 329                 Channel_Exit( );
 330                 Log_Exit( );
 331         }
 332         Pidfile_Delete( );
 333
 334         return 0;
 335 } /* main */
 336
 337
 338 /**
 339  * Generate ngIRCd "version string".
 340  * This string is generated once and then stored in NGIRCd_Version for
 341  * further usage, for example by the IRC command VERSION and the --version
 342  * command line switch.
 343  */
 344 static void
 345 Fill_Version( void )
 346 {
 347         NGIRCd_VersionAddition[0] = '\0';
 348
 349 #ifdef SYSLOG
 350         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 351 #endif
 352 #ifdef ZLIB
 353         if( NGIRCd_VersionAddition[0] )
 354                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 355
 356         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 357 #endif
 358 #ifdef TCPWRAP
 359         if( NGIRCd_VersionAddition[0] )
 360                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 361
 362         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 363 #endif
 364 #ifdef ZEROCONF
 365         if( NGIRCd_VersionAddition[0] )
 366                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 367
 368         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 369 #endif
 370 #ifdef IDENTAUTH
 371         if( NGIRCd_VersionAddition[0] )
 372                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 373
 374         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 375 #endif
 376 #ifdef DEBUG
 377         if( NGIRCd_VersionAddition[0] )
 378                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 379
 380         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 381 #endif
 382 #ifdef SNIFFER
 383         if( NGIRCd_VersionAddition[0] )
 384                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 385
 386         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 387 #endif
 388 #ifdef STRICT_RFC
 389         if( NGIRCd_VersionAddition[0] )
 390                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 391
 392         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 393 #endif
 394 #ifdef IRCPLUS
 395         if( NGIRCd_VersionAddition[0] )
 396                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 397
 398         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 399 #endif
 400
 401         if( NGIRCd_VersionAddition[0] )
 402                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 403
 404         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 405         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 406         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 407         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 408         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 409
 410 #ifdef CVSDATE
 411         snprintf( NGIRCd_Version, sizeof NGIRCd_Version,"%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition);
 412 #else
 413         snprintf( NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 414 #endif
 415 } /* Fill_Version */
 416
 417
 418 /**
 419  * Reload the server configuration file.
 420  */
 421 GLOBAL void
 422 NGIRCd_Rehash( void )
 423 {
 424         char old_name[CLIENT_ID_LEN];
 425
 426         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 427         NGIRCd_SignalRehash = false;
 428
 429         /* Close down all listening sockets */
 430         Conn_ExitListeners( );
 431
 432         /* Remember old server name */
 433         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 434
 435         /* Re-read configuration ... */
 436         Conf_Rehash( );
 437
 438         /* Recover old server name: it can't be changed during run-time */
 439         if( strcmp( old_name, Conf_ServerName ) != 0 )
 440         {
 441                 strlcpy( Conf_ServerName, old_name, sizeof Conf_ServerName );
 442                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 443         }
 444
 445         /* Create new pre-defined channels */
 446         Channel_InitPredefined( );
 447
 448         /* Start listening on sockets */
 449         Conn_InitListeners( );
 450
 451         /* Sync configuration with established connections */
 452         Conn_SyncServerStruct( );
 453
 454         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 455 } /* NGIRCd_Rehash */
 456
 457
 458 /**
 459  * Initialize the signal handler.
 460  */
 461 static void
 462 Initialize_Signal_Handler( void )
 463 {
 464         /* Signal-Handler initialisieren: einige Signale
 465          * werden ignoriert, andere speziell behandelt. */
 466
 467 #ifdef HAVE_SIGACTION
 468         /* sigaction() ist vorhanden */
 469
 470         struct sigaction saction;
 471
 472         /* Signal-Struktur initialisieren */
 473         memset( &saction, 0, sizeof( saction ));
 474         saction.sa_handler = Signal_Handler;
 475 #ifdef SA_RESTART
 476         saction.sa_flags |= SA_RESTART;
 477 #endif
 478 #ifdef SA_NOCLDWAIT
 479         saction.sa_flags |= SA_NOCLDWAIT;
 480 #endif
 481
 482         /* Signal-Handler einhaengen */
 483         sigaction(SIGINT, &saction, NULL);
 484         sigaction(SIGQUIT, &saction, NULL);
 485         sigaction(SIGTERM, &saction, NULL);
 486         sigaction(SIGHUP, &saction, NULL);
 487         sigaction(SIGCHLD, &saction, NULL);
 488
 489         /* einige Signale ignorieren */
 490         saction.sa_handler = SIG_IGN;
 491         sigaction(SIGPIPE, &saction, NULL);
 492 #else
 493         /* kein sigaction() vorhanden */
 494
 495         /* Signal-Handler einhaengen */
 496         signal(SIGINT, Signal_Handler);
 497         signal(SIGQUIT, Signal_Handler);
 498         signal(SIGTERM, Signal_Handler);
 499         signal(SIGHUP, Signal_Handler);
 500         signal(SIGCHLD, Signal_Handler);
 501
 502         /* einige Signale ignorieren */
 503         signal(SIGPIPE, SIG_IGN);
 504 #endif
 505 } /* Initialize_Signal_Handler */
 506
 507
 508 /**
 509  * Signal handler of ngIRCd.
 510  * This function is called whenever ngIRCd catches a signal sent by the
 511  * user and/or the system to it. For example SIGTERM and SIGHUP.
 512  * @param Signal Number of the signal to handle.
 513  */
 514 static void
 515 Signal_Handler( int Signal )
 516 {
 517         switch( Signal )
 518         {
 519                 case SIGTERM:
 520                 case SIGINT:
 521                 case SIGQUIT:
 522                         /* wir soll(t)en uns wohl beenden ... */
 523                         NGIRCd_SignalQuit = true;
 524                         break;
 525                 case SIGHUP:
 526                         /* Konfiguration neu einlesen: */
 527                         NGIRCd_SignalRehash = true;
 528                         break;
 529                 case SIGCHLD:
 530                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 531                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 532                         break;
 533 #ifdef DEBUG
 534                 default:
 535                         /* unbekanntes bzw. unbehandeltes Signal */
 536                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 537 #endif
 538         }
 539 } /* Signal_Handler */
 540
 541
 542 /**
 543  * Display copyright and version information of ngIRCd on the console.
 544  */
 545 static void
 546 Show_Version( void )
 547 {
 548         puts( NGIRCd_Version );
 549         puts( "Copyright (c)2001-2006 Alexander Barton (<alex@barton.de>) and Contributors." );
 550         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 551         puts( "This is free software; see the source for copying conditions. There is NO" );
 552         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 553 } /* Show_Version */
 554
 555
 556 /**
 557  * Display a short help text on the console.
 558  * This help depends on the configuration of the executable and only shows
 559  * options that are actually enabled.
 560  */
 561 static void
 562 Show_Help( void )
 563 {
 564 #ifdef DEBUG
 565         puts( "  -d, --debug        log extra debug messages" );
 566 #endif
 567         puts( "  -f, --config <f>   use file <f> as configuration file" );
 568         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 569         puts( "  -p, --passive      disable automatic connections to other servers" );
 570 #ifdef SNIFFER
 571         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 572 #endif
 573         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 574         puts( "      --version      output version information and exit" );
 575         puts( "      --help         display this help and exit" );
 576 } /* Show_Help */
 577
 578
 579 /**
 580  * Delete the file containing the process ID (PID).
 581  */
 582 static void
 583 Pidfile_Delete( void )
 584 {
 585         /* Pidfile configured? */
 586         if( ! Conf_PidFile[0] ) return;
 587
 588 #ifdef DEBUG
 589         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 590 #endif
 591
 592         if( unlink( Conf_PidFile ))
 593                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 594 } /* Pidfile_Delete */
 595
 596
 597 /**
 598  * Create the file containing the process ID of ngIRCd ("PID file").
 599  * @param pid The process ID to be stored in this file.
 600  */
 601 static void
 602 Pidfile_Create(pid_t pid)
 603 {
 604         int pidfd;
 605         char pidbuf[64];
 606         int len;
 607
 608         /* Pidfile configured? */
 609         if( ! Conf_PidFile[0] ) return;
 610
 611 #ifdef DEBUG
 612         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 613 #endif
 614
 615         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 616         if ( pidfd < 0 ) {
 617                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 618                 return;
 619         }
 620
 621         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 622         if (len < 0 || len >= (int)sizeof pidbuf) {
 623                 Log( LOG_ERR, "Error converting pid");
 624                 return;
 625         }
 626
 627         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 628                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 629
 630         if( close(pidfd) != 0 )
 631                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 632 } /* Pidfile_Create */
 633
 634
 635 /**
 636  * Redirect stdin, stdout and stderr to apropriate file handles.
 637  */
 638 static void
 639 Setup_FDStreams( void )
 640 {
 641         int fd;
 642
 643         /* Test if we can open /dev/null for reading and writing. If not
 644          * we are most probably chrooted already and the server has been
 645          * restarted. So we simply don't try to redirect stdXXX ... */
 646         fd = open( "/dev/null", O_RDWR );
 647         if ( fd < 0 ) {
 648                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 649                 return;
 650         }
 651
 652         fflush(stdout);
 653         fflush(stderr);
 654
 655         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 656         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 657
 658         /* Close newly opened file descriptor if not stdin/out/err */
 659         if( fd > 2 ) close( fd );
 660 } /* Setup_FDStreams */
 661
 662
 663 static bool
 664 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 665 {
 666         struct passwd *pwd;
 667
 668         pwd = getpwnam("nobody");
 669         if (!pwd) return false;
 670
 671         if ( !pwd->pw_uid || !pwd->pw_gid)
 672                 return false;
 673
 674         *uid = pwd->pw_uid;
 675         *gid = pwd->pw_gid;
 676         endpwent();
 677
 678         return true;
 679 }
 680
 681
 682 static bool
 683 NGIRCd_Init( bool NGIRCd_NoDaemon )
 684 {
 685         static bool initialized;
 686         bool chrooted = false;
 687         struct passwd *pwd;
 688         struct group *grp;
 689         int real_errno;
 690         pid_t pid;
 691
 692         if (initialized)
 693                 return true;
 694
 695         if( Conf_Chroot[0] ) {
 696                 if( chdir( Conf_Chroot ) != 0 ) {
 697                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 698                         return false;
 699                 }
 700
 701                 if( chroot( Conf_Chroot ) != 0 ) {
 702                         if (errno != EPERM) {
 703                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 704                                                                 Conf_Chroot, strerror( errno ));
 705
 706                                 return false;
 707                         }
 708                 } else {
 709                         chrooted = true;
 710                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 711                 }
 712         }
 713
 714         if (Conf_UID == 0) {
 715                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 716
 717                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 718                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 719                                         errno ? strerror(errno) : "not found" );
 720                         return false;
 721                 }
 722         }
 723
 724         if (getgid() != Conf_GID) {
 725                 /* Change group ID */
 726                 if (setgid(Conf_GID) != 0) {
 727                         real_errno = errno;
 728                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 729                         if (real_errno != EPERM)
 730                                 return false;
 731                 }
 732         }
 733
 734         if (getuid() != Conf_UID) {
 735                 /* Change user ID */
 736                 if (setuid(Conf_UID) != 0) {
 737                         real_errno = errno;
 738                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 739                         if (real_errno != EPERM)
 740                                 return false;
 741                 }
 742         }
 743
 744         initialized = true;
 745
 746         /* Normally a child process is forked which isn't any longer
 747          * connected to ther controlling terminal. Use "--nodaemon"
 748          * to disable this "daemon mode" (useful for debugging). */
 749         if ( ! NGIRCd_NoDaemon ) {
 750                 pid = fork( );
 751                 if( pid > 0 ) {
 752                         /* "Old" process: exit. */
 753                         exit( 0 );
 754                 }
 755                 if( pid < 0 ) {
 756                         /* Error!? */
 757                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 758                                                                 PACKAGE_NAME, strerror( errno ));
 759                         exit( 1 );
 760                 }
 761
 762                 /* New child process */
 763                 (void)setsid( );
 764                 chdir( "/" );
 765
 766                 /* Detach stdin, stdout and stderr */
 767                 Setup_FDStreams( );
 768         }
 769         pid = getpid();
 770
 771         Pidfile_Create( pid );
 772
 773         /* Check UID/GID we are running as, can be different from values
 774          * configured (e. g. if we were already started with a UID>0. */
 775         Conf_UID = getuid();
 776         Conf_GID = getgid();
 777
 778         pwd = getpwuid( Conf_UID );
 779         grp = getgrgid( Conf_GID );
 780
 781         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 782                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
 783                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
 784
 785         if ( chrooted ) {
 786                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
 787                 return true;
 788         } else {
 789                 Log( LOG_INFO, "Not running chrooted." );
 790         }
 791
 792         /* Change working directory to home directory of the user
 793          * we are running as (only when running in daemon mode and not in chroot) */
 794
 795         if ( pwd ) {
 796                 if (!NGIRCd_NoDaemon ) {
 797                         if( chdir( pwd->pw_dir ) == 0 )
 798                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 799                         else
 800                                 Log( LOG_ERR, "Can't change working directory to \"%s\": %s",
 801                                                                 pwd->pw_dir, strerror( errno ));
 802                 }
 803         } else {
 804                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 805         }
 806
 807 return true;
 808 }
 809
 810 /* -eof- */