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