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