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 #if defined(DEBUG) && defined(HAVE_MTRACE)
  38 #include <mcheck.h>
  39 #endif
  40
  41 #include "defines.h"
  42 #include "resolve.h"
  43 #include "conn.h"
  44 #include "conf-ssl.h"
  45 #include "client.h"
  46 #include "channel.h"
  47 #include "conf.h"
  48 #include "lists.h"
  49 #include "log.h"
  50 #include "parse.h"
  51 #include "irc.h"
  52
  53 #ifdef ZEROCONF
  54 #include "rendezvous.h"
  55 #endif
  56
  57 #include "exp.h"
  58 #include "ngircd.h"
  59
  60
  61 static void Initialize_Signal_Handler PARAMS(( void ));
  62 static void Signal_Handler PARAMS(( int Signal ));
  63
  64 static void Show_Version PARAMS(( void ));
  65 static void Show_Help PARAMS(( void ));
  66
  67 static void Pidfile_Create PARAMS(( pid_t pid ));
  68 static void Pidfile_Delete PARAMS(( void ));
  69
  70 static void Fill_Version PARAMS(( void ));
  71
  72 static void Setup_FDStreams PARAMS(( void ));
  73
  74 static bool NGIRCd_Init PARAMS(( bool ));
  75
  76 /**
  77  * The main() function of ngIRCd.
  78  * Here all starts: this function is called by the operating system loader,
  79  * it is the first portion of code executed of ngIRCd.
  80  * @param argc The number of arguments passed to ngIRCd on the command line.
  81  * @param argv An array containing all the arguments passed to ngIRCd.
  82  * @return Global exit code of ngIRCd, zero on success.
  83  */
  84 GLOBAL int
  85 main( int argc, const char *argv[] )
  86 {
  87         bool ok, configtest = false;
  88         bool NGIRCd_NoDaemon = false;
  89         int i;
  90         size_t n;
  91
  92 #if defined(DEBUG) && defined(HAVE_MTRACE)
  93         /* enable GNU libc memory tracing when running in debug mode
  94          * and functionality available */
  95         mtrace();
  96 #endif
  97
  98         umask( 0077 );
  99
 100         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
 101         NGIRCd_Passive = false;
 102 #ifdef DEBUG
 103         NGIRCd_Debug = false;
 104 #endif
 105 #ifdef SNIFFER
 106         NGIRCd_Sniffer = false;
 107 #endif
 108         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 109         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 110
 111         Fill_Version( );
 112
 113         /* Kommandozeile parsen */
 114         for( i = 1; i < argc; i++ )
 115         {
 116                 ok = false;
 117                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 118                 {
 119                         /* Lange Option */
 120
 121                         if( strcmp( argv[i], "--config" ) == 0 )
 122                         {
 123                                 if( i + 1 < argc )
 124                                 {
 125                                         /* Ok, there's an parameter left */
 126                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 127
 128                                         /* next parameter */
 129                                         i++; ok = true;
 130                                 }
 131                         }
 132                         if( strcmp( argv[i], "--configtest" ) == 0 )
 133                         {
 134                                 configtest = true;
 135                                 ok = true;
 136                         }
 137 #ifdef DEBUG
 138                         if( strcmp( argv[i], "--debug" ) == 0 )
 139                         {
 140                                 NGIRCd_Debug = true;
 141                                 ok = true;
 142                         }
 143 #endif
 144                         if( strcmp( argv[i], "--help" ) == 0 )
 145                         {
 146                                 Show_Version( );
 147                                 puts( "" ); Show_Help( ); puts( "" );
 148                                 exit( 1 );
 149                         }
 150                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 151                         {
 152                                 NGIRCd_NoDaemon = true;
 153                                 ok = true;
 154                         }
 155                         if( strcmp( argv[i], "--passive" ) == 0 )
 156                         {
 157                                 NGIRCd_Passive = true;
 158                                 ok = true;
 159                         }
 160 #ifdef SNIFFER
 161                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 162                         {
 163                                 NGIRCd_Sniffer = true;
 164                                 ok = true;
 165                         }
 166 #endif
 167                         if( strcmp( argv[i], "--version" ) == 0 )
 168                         {
 169                                 Show_Version( );
 170                                 exit( 1 );
 171                         }
 172                 }
 173                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 174                 {
 175                         /* Kurze Option */
 176                         for( n = 1; n < strlen( argv[i] ); n++ )
 177                         {
 178                                 ok = false;
 179 #ifdef DEBUG
 180                                 if (argv[i][n] == 'd') {
 181                                         NGIRCd_Debug = true;
 182                                         ok = true;
 183                                 }
 184 #endif
 185                                 if (argv[i][n] == 'f') {
 186                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 187                                         {
 188                                                 /* Ok, next character is a blank */
 189                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 190
 191                                                 /* go to the following parameter */
 192                                                 i++;
 193                                                 n = strlen( argv[i] );
 194                                                 ok = true;
 195                                         }
 196                                 }
 197
 198                                 if (argv[i][n] == 'h') {
 199                                         Show_Version();
 200                                         puts(""); Show_Help(); puts("");
 201                                         exit(1);
 202                                 }
 203
 204                                 if (argv[i][n] == 'n') {
 205                                         NGIRCd_NoDaemon = true;
 206                                         ok = true;
 207                                 }
 208                                 if (argv[i][n] == 'p') {
 209                                         NGIRCd_Passive = true;
 210                                         ok = true;
 211                                 }
 212 #ifdef SNIFFER
 213                                 if (argv[i][n] == 's') {
 214                                         NGIRCd_Sniffer = true;
 215                                         ok = true;
 216                                 }
 217 #endif
 218                                 if (argv[i][n] == 't') {
 219                                         configtest = true;
 220                                         ok = true;
 221                                 }
 222
 223                                 if (argv[i][n] == 'V') {
 224                                         Show_Version();
 225                                         exit(1);
 226                                 }
 227
 228                                 if (! ok) {
 229                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 230                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 231                                         exit( 1 );
 232                                 }
 233                         }
 234
 235                 }
 236                 if( ! ok )
 237                 {
 238                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 239                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 240                         exit( 1 );
 241                 }
 242         }
 243
 244         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 245         NGIRCd_DebugLevel[0] = '\0';
 246 #ifdef DEBUG
 247         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 248 #endif
 249 #ifdef SNIFFER
 250         if( NGIRCd_Sniffer )
 251         {
 252                 NGIRCd_Debug = true;
 253                 strcpy( NGIRCd_DebugLevel, "2" );
 254         }
 255 #endif
 256
 257         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 258         if( configtest )
 259         {
 260                 Show_Version( ); puts( "" );
 261                 exit( Conf_Test( ));
 262         }
 263
 264         while( ! NGIRCd_SignalQuit )
 265         {
 266                 /* Initialize global variables */
 267                 NGIRCd_Start = time( NULL );
 268                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 269
 270                 NGIRCd_SignalRehash = false;
 271                 NGIRCd_SignalRestart = false;
 272                 NGIRCd_SignalQuit = false;
 273
 274                 /* Initialize modules, part I */
 275                 Log_Init( ! NGIRCd_NoDaemon );
 276                 Conf_Init( );
 277
 278                 /* Initialize the "main program": chroot environment, user and
 279                  * group ID, ... */
 280                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 281                         Log(LOG_ALERT, "Fatal: Initialization failed");
 282                         exit(1);
 283                 }
 284
 285                 /* Initialize modules, part II: these functions are eventually
 286                  * called with already dropped privileges ... */
 287                 Channel_Init( );
 288                 Client_Init( );
 289 #ifdef ZEROCONF
 290                 Rendezvous_Init( );
 291 #endif
 292                 Conn_Init( );
 293
 294 #ifdef DEBUG
 295                 /* Redirect stderr handle to "error file" for debugging
 296                  * when not running in "no daemon" mode: */
 297                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 298 #endif
 299
 300                 /* Signal-Handler initialisieren */
 301                 Initialize_Signal_Handler( );
 302
 303                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 304                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 305                  * sind in doc/Protocol.txt beschrieben. */
 306 #ifdef IRCPLUS
 307                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 308 #ifdef ZLIB
 309                 strcat( NGIRCd_ProtoID, "Z" );
 310 #endif
 311                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 312 #else
 313                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 314 #endif
 315                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 316 #ifdef ZLIB
 317                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 318 #endif
 319                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 320
 321                 /* Vordefinierte Channels anlegen */
 322                 Channel_InitPredefined( );
 323
 324                 /* Listen-Ports initialisieren */
 325                 if( Conn_InitListeners( ) < 1 )
 326                 {
 327                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 328                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 329                         Pidfile_Delete( );
 330                         exit( 1 );
 331                 }
 332
 333                 /* Hauptschleife */
 334                 Conn_Handler( );
 335
 336                 /* Alles abmelden */
 337                 Conn_Exit( );
 338 #ifdef ZEROCONF
 339                 Rendezvous_Exit( );
 340 #endif
 341                 Client_Exit( );
 342                 Channel_Exit( );
 343                 Log_Exit( );
 344         }
 345         Pidfile_Delete( );
 346
 347         return 0;
 348 } /* main */
 349
 350
 351 /**
 352  * Generate ngIRCd "version string".
 353  * This string is generated once and then stored in NGIRCd_Version for
 354  * further usage, for example by the IRC command VERSION and the --version
 355  * command line switch.
 356  */
 357 static void
 358 Fill_Version( void )
 359 {
 360         NGIRCd_VersionAddition[0] = '\0';
 361
 362 #ifdef SYSLOG
 363         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 364 #endif
 365 #ifdef ZLIB
 366         if( NGIRCd_VersionAddition[0] )
 367                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 368
 369         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 370 #endif
 371 #ifdef SSL_SUPPORT
 372         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 373         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 374 #endif
 375 #ifdef TCPWRAP
 376         if( NGIRCd_VersionAddition[0] )
 377                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 378
 379         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 380 #endif
 381 #ifdef ZEROCONF
 382         if( NGIRCd_VersionAddition[0] )
 383                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 384
 385         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 386 #endif
 387 #ifdef IDENTAUTH
 388         if( NGIRCd_VersionAddition[0] )
 389                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 390
 391         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 392 #endif
 393 #ifdef DEBUG
 394         if( NGIRCd_VersionAddition[0] )
 395                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 396
 397         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 398 #endif
 399 #ifdef SNIFFER
 400         if( NGIRCd_VersionAddition[0] )
 401                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 402
 403         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 404 #endif
 405 #ifdef STRICT_RFC
 406         if( NGIRCd_VersionAddition[0] )
 407                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 408
 409         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 410 #endif
 411 #ifdef IRCPLUS
 412         if( NGIRCd_VersionAddition[0] )
 413                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 414
 415         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 416 #endif
 417 #ifdef WANT_IPV6
 418         if (NGIRCd_VersionAddition[0])
 419                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 420
 421         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 422 #endif
 423         if( NGIRCd_VersionAddition[0] )
 424                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 425
 426         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 427         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 428         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 429         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 430         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 431
 432         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 433                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 434         } /* Fill_Version */
 435
 436
 437 /**
 438  * Reload the server configuration file.
 439  */
 440 GLOBAL void
 441 NGIRCd_Rehash( void )
 442 {
 443         char old_name[CLIENT_ID_LEN];
 444         unsigned old_nicklen;
 445
 446         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 447         NGIRCd_SignalRehash = false;
 448
 449         /* Remember old server name and nick name length */
 450         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 451         old_nicklen = Conf_MaxNickLength;
 452
 453         /* Re-read configuration ... */
 454         if (!Conf_Rehash( ))
 455                 return;
 456
 457         /* Close down all listening sockets */
 458         Conn_ExitListeners( );
 459
 460         /* Recover old server name and nick name length: these values can't
 461          * be changed during run-time */
 462         if (strcmp(old_name, Conf_ServerName) != 0 ) {
 463                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
 464                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
 465         }
 466         if (old_nicklen != Conf_MaxNickLength) {
 467                 Conf_MaxNickLength = old_nicklen;
 468                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 469         }
 470
 471         /* Create new pre-defined channels */
 472         Channel_InitPredefined( );
 473
 474         if (!ConnSSL_InitLibrary())
 475                 Log(LOG_WARNING, "Re-Initializing SSL failed, using old keys");
 476
 477         /* Start listening on sockets */
 478         Conn_InitListeners( );
 479
 480         /* Sync configuration with established connections */
 481         Conn_SyncServerStruct( );
 482
 483         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 484 } /* NGIRCd_Rehash */
 485
 486
 487 /**
 488  * Initialize the signal handler.
 489  */
 490 static void
 491 Initialize_Signal_Handler( void )
 492 {
 493         /* Signal-Handler initialisieren: einige Signale
 494          * werden ignoriert, andere speziell behandelt. */
 495
 496 #ifdef HAVE_SIGACTION
 497         /* sigaction() ist vorhanden */
 498
 499         struct sigaction saction;
 500
 501         /* Signal-Struktur initialisieren */
 502         memset( &saction, 0, sizeof( saction ));
 503         saction.sa_handler = Signal_Handler;
 504 #ifdef SA_RESTART
 505         saction.sa_flags |= SA_RESTART;
 506 #endif
 507 #ifdef SA_NOCLDWAIT
 508         saction.sa_flags |= SA_NOCLDWAIT;
 509 #endif
 510
 511         /* Signal-Handler einhaengen */
 512         sigaction(SIGINT, &saction, NULL);
 513         sigaction(SIGQUIT, &saction, NULL);
 514         sigaction(SIGTERM, &saction, NULL);
 515         sigaction(SIGHUP, &saction, NULL);
 516         sigaction(SIGCHLD, &saction, NULL);
 517
 518         /* einige Signale ignorieren */
 519         saction.sa_handler = SIG_IGN;
 520         sigaction(SIGPIPE, &saction, NULL);
 521 #else
 522         /* kein sigaction() vorhanden */
 523
 524         /* Signal-Handler einhaengen */
 525         signal(SIGINT, Signal_Handler);
 526         signal(SIGQUIT, Signal_Handler);
 527         signal(SIGTERM, Signal_Handler);
 528         signal(SIGHUP, Signal_Handler);
 529         signal(SIGCHLD, Signal_Handler);
 530
 531         /* einige Signale ignorieren */
 532         signal(SIGPIPE, SIG_IGN);
 533 #endif
 534 } /* Initialize_Signal_Handler */
 535
 536
 537 /**
 538  * Signal handler of ngIRCd.
 539  * This function is called whenever ngIRCd catches a signal sent by the
 540  * user and/or the system to it. For example SIGTERM and SIGHUP.
 541  * @param Signal Number of the signal to handle.
 542  */
 543 static void
 544 Signal_Handler( int Signal )
 545 {
 546         switch( Signal )
 547         {
 548                 case SIGTERM:
 549                 case SIGINT:
 550                 case SIGQUIT:
 551                         /* wir soll(t)en uns wohl beenden ... */
 552                         NGIRCd_SignalQuit = true;
 553                         break;
 554                 case SIGHUP:
 555                         /* Konfiguration neu einlesen: */
 556                         NGIRCd_SignalRehash = true;
 557                         break;
 558                 case SIGCHLD:
 559                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 560                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 561                         break;
 562 #ifdef DEBUG
 563                 default:
 564                         /* unbekanntes bzw. unbehandeltes Signal */
 565                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 566 #endif
 567         }
 568 } /* Signal_Handler */
 569
 570
 571 /**
 572  * Display copyright and version information of ngIRCd on the console.
 573  */
 574 static void
 575 Show_Version( void )
 576 {
 577         puts( NGIRCd_Version );
 578         puts( "Copyright (c)2001-2008 Alexander Barton (<alex@barton.de>) and Contributors." );
 579         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 580         puts( "This is free software; see the source for copying conditions. There is NO" );
 581         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 582 } /* Show_Version */
 583
 584
 585 /**
 586  * Display a short help text on the console.
 587  * This help depends on the configuration of the executable and only shows
 588  * options that are actually enabled.
 589  */
 590 static void
 591 Show_Help( void )
 592 {
 593 #ifdef DEBUG
 594         puts( "  -d, --debug        log extra debug messages" );
 595 #endif
 596         puts( "  -f, --config <f>   use file <f> as configuration file" );
 597         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 598         puts( "  -p, --passive      disable automatic connections to other servers" );
 599 #ifdef SNIFFER
 600         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 601 #endif
 602         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 603         puts( "  -V, --version      output version information and exit" );
 604         puts( "  -h, --help         display this help and exit" );
 605 } /* Show_Help */
 606
 607
 608 /**
 609  * Delete the file containing the process ID (PID).
 610  */
 611 static void
 612 Pidfile_Delete( void )
 613 {
 614         /* Pidfile configured? */
 615         if( ! Conf_PidFile[0] ) return;
 616
 617 #ifdef DEBUG
 618         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 619 #endif
 620
 621         if( unlink( Conf_PidFile ))
 622                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 623 } /* Pidfile_Delete */
 624
 625
 626 /**
 627  * Create the file containing the process ID of ngIRCd ("PID file").
 628  * @param pid The process ID to be stored in this file.
 629  */
 630 static void
 631 Pidfile_Create(pid_t pid)
 632 {
 633         int pidfd;
 634         char pidbuf[64];
 635         int len;
 636
 637         /* Pidfile configured? */
 638         if( ! Conf_PidFile[0] ) return;
 639
 640 #ifdef DEBUG
 641         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 642 #endif
 643
 644         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 645         if ( pidfd < 0 ) {
 646                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 647                 return;
 648         }
 649
 650         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 651         if (len < 0 || len >= (int)sizeof pidbuf) {
 652                 Log( LOG_ERR, "Error converting pid");
 653                 return;
 654         }
 655
 656         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 657                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 658
 659         if( close(pidfd) != 0 )
 660                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 661 } /* Pidfile_Create */
 662
 663
 664 /**
 665  * Redirect stdin, stdout and stderr to apropriate file handles.
 666  */
 667 static void
 668 Setup_FDStreams( void )
 669 {
 670         int fd;
 671
 672         /* Test if we can open /dev/null for reading and writing. If not
 673          * we are most probably chrooted already and the server has been
 674          * restarted. So we simply don't try to redirect stdXXX ... */
 675         fd = open( "/dev/null", O_RDWR );
 676         if ( fd < 0 ) {
 677                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 678                 return;
 679         }
 680
 681         fflush(stdout);
 682         fflush(stderr);
 683
 684         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 685         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 686
 687         /* Close newly opened file descriptor if not stdin/out/err */
 688         if( fd > 2 ) close( fd );
 689 } /* Setup_FDStreams */
 690
 691
 692 static bool
 693 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 694 {
 695         struct passwd *pwd;
 696
 697 #ifdef __CYGWIN__
 698         /* Cygwin kludge.
 699          * It can return EINVAL instead of EPERM
 700          * so, if we are already unprivileged,
 701          * use id of current user.
 702          */
 703         if (geteuid() && getuid()) {
 704                 *uid = getuid();
 705                 *gid = getgid();
 706                 return true;
 707         }
 708 #endif
 709
 710         pwd = getpwnam("nobody");
 711         if (!pwd) return false;
 712
 713         if ( !pwd->pw_uid || !pwd->pw_gid)
 714                 return false;
 715
 716         *uid = pwd->pw_uid;
 717         *gid = pwd->pw_gid;
 718         endpwent();
 719
 720         return true;
 721 }
 722
 723
 724 static bool
 725 NGIRCd_Init( bool NGIRCd_NoDaemon )
 726 {
 727         static bool initialized;
 728         bool chrooted = false;
 729         struct passwd *pwd;
 730         struct group *grp;
 731         int real_errno;
 732         pid_t pid;
 733
 734         if (initialized)
 735                 return true;
 736
 737         if (!ConnSSL_InitLibrary())
 738                 Log(LOG_WARNING,
 739                     "Warning: Error during SSL initialization, continuing ...");
 740
 741         if( Conf_Chroot[0] ) {
 742                 if( chdir( Conf_Chroot ) != 0 ) {
 743                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 744                         return false;
 745                 }
 746
 747                 if( chroot( Conf_Chroot ) != 0 ) {
 748                         if (errno != EPERM) {
 749                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 750                                                                 Conf_Chroot, strerror( errno ));
 751
 752                                 return false;
 753                         }
 754                 } else {
 755                         chrooted = true;
 756                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 757                 }
 758         }
 759
 760         if (Conf_UID == 0) {
 761                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 762
 763                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 764                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 765                                         errno ? strerror(errno) : "not found" );
 766                         return false;
 767                 }
 768         }
 769
 770         if (getgid() != Conf_GID) {
 771                 /* Change group ID */
 772                 if (setgid(Conf_GID) != 0) {
 773                         real_errno = errno;
 774                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 775                         if (real_errno != EPERM)
 776                                 return false;
 777                 }
 778         }
 779
 780         if (getuid() != Conf_UID) {
 781                 /* Change user ID */
 782                 if (setuid(Conf_UID) != 0) {
 783                         real_errno = errno;
 784                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 785                         if (real_errno != EPERM)
 786                                 return false;
 787                 }
 788         }
 789
 790         initialized = true;
 791
 792         /* Normally a child process is forked which isn't any longer
 793          * connected to ther controlling terminal. Use "--nodaemon"
 794          * to disable this "daemon mode" (useful for debugging). */
 795         if ( ! NGIRCd_NoDaemon ) {
 796                 pid = fork( );
 797                 if( pid > 0 ) {
 798                         /* "Old" process: exit. */
 799                         exit( 0 );
 800                 }
 801                 if( pid < 0 ) {
 802                         /* Error!? */
 803                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 804                                                                 PACKAGE_NAME, strerror( errno ));
 805                         exit( 1 );
 806                 }
 807
 808                 /* New child process */
 809 #ifndef NeXT
 810                 (void)setsid( );
 811 #else
 812                 setpgrp(0, getpid());
 813 #endif
 814                 chdir( "/" );
 815
 816                 /* Detach stdin, stdout and stderr */
 817                 Setup_FDStreams( );
 818         }
 819         pid = getpid();
 820
 821         Pidfile_Create( pid );
 822
 823         /* Check UID/GID we are running as, can be different from values
 824          * configured (e. g. if we were already started with a UID>0. */
 825         Conf_UID = getuid();
 826         Conf_GID = getgid();
 827
 828         pwd = getpwuid( Conf_UID );
 829         grp = getgrgid( Conf_GID );
 830
 831         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 832                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
 833                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
 834
 835         if (chrooted) {
 836                 Log(LOG_INFO, "Running with root directory \"%s\".",
 837                     Conf_Chroot );
 838                 return true;
 839         } else
 840                 Log(LOG_INFO, "Not running with changed root directory.");
 841
 842         /* Change working directory to home directory of the user
 843          * we are running as (only when running in daemon mode and not in chroot) */
 844
 845         if ( pwd ) {
 846                 if (!NGIRCd_NoDaemon ) {
 847                         if( chdir( pwd->pw_dir ) == 0 )
 848                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 849                         else
 850                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 851                                                                 pwd->pw_dir, strerror( errno ));
 852                 }
 853         } else {
 854                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 855         }
 856
 857 return true;
 858 }
 859
 860 /* -eof- */