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