src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12
  13 #include "portab.h"
  14
  15 static char UNUSED id[] = "$Id: ngircd.c,v 1.102 2005/06/24 19:55:10 alex Exp $";
  16
  17 /**
  18  * @file
  19  * The main program, including the C function main() which is called
  20  * by the loader of the operating system.
  21  */
  22
  23 #include "imp.h"
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <sys/wait.h>
  35 #include <fcntl.h>
  36 #include <pwd.h>
  37 #include <grp.h>
  38
  39 #include "defines.h"
  40 #include "resolve.h"
  41 #include "conn.h"
  42 #include "client.h"
  43 #include "channel.h"
  44 #include "conf.h"
  45 #include "cvs-version.h"
  46 #include "lists.h"
  47 #include "log.h"
  48 #include "parse.h"
  49 #include "irc.h"
  50
  51 #ifdef RENDEZVOUS
  52 #include "rendezvous.h"
  53 #endif
  54
  55 #include "exp.h"
  56 #include "ngircd.h"
  57
  58
  59 LOCAL void Initialize_Signal_Handler PARAMS(( void ));
  60 LOCAL void Signal_Handler PARAMS(( int Signal ));
  61
  62 LOCAL void Show_Version PARAMS(( void ));
  63 LOCAL void Show_Help PARAMS(( void ));
  64
  65 LOCAL void Pidfile_Create PARAMS(( long ));
  66 LOCAL void Pidfile_Delete PARAMS(( void ));
  67
  68 LOCAL void Fill_Version PARAMS(( void ));
  69
  70 LOCAL void Setup_FDStreams PARAMS(( void ));
  71
  72 LOCAL bool NGIRCd_Init PARAMS(( bool ));
  73
  74 /**
  75  * The main() function of ngIRCd.
  76  * Here all starts: this function is called by the operating system loader,
  77  * it is the first portion of code executed of ngIRCd.
  78  * @param argc The number of arguments passed to ngIRCd on the command line.
  79  * @param argv An array containing all the arguments passed to ngIRCd.
  80  * @return Global exit code of ngIRCd, zero on success.
  81  */
  82 GLOBAL int
  83 main( int argc, const char *argv[] )
  84 {
  85         bool ok, configtest = false;
  86         bool NGIRCd_NoDaemon = false;
  87         int i;
  88         size_t n;
  89
  90         umask( 0077 );
  91
  92         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
  93         NGIRCd_Passive = false;
  94 #ifdef DEBUG
  95         NGIRCd_Debug = false;
  96 #endif
  97 #ifdef SNIFFER
  98         NGIRCd_Sniffer = false;
  99 #endif
 100         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 101         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 102
 103         Fill_Version( );
 104
 105         /* Kommandozeile parsen */
 106         for( i = 1; i < argc; i++ )
 107         {
 108                 ok = false;
 109                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 110                 {
 111                         /* Lange Option */
 112
 113                         if( strcmp( argv[i], "--config" ) == 0 )
 114                         {
 115                                 if( i + 1 < argc )
 116                                 {
 117                                         /* Ok, there's an parameter left */
 118                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 119
 120                                         /* next parameter */
 121                                         i++; ok = true;
 122                                 }
 123                         }
 124                         if( strcmp( argv[i], "--configtest" ) == 0 )
 125                         {
 126                                 configtest = true;
 127                                 ok = true;
 128                         }
 129 #ifdef DEBUG
 130                         if( strcmp( argv[i], "--debug" ) == 0 )
 131                         {
 132                                 NGIRCd_Debug = true;
 133                                 ok = true;
 134                         }
 135 #endif
 136                         if( strcmp( argv[i], "--help" ) == 0 )
 137                         {
 138                                 Show_Version( );
 139                                 puts( "" ); Show_Help( ); puts( "" );
 140                                 exit( 1 );
 141                         }
 142                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 143                         {
 144                                 NGIRCd_NoDaemon = true;
 145                                 ok = true;
 146                         }
 147                         if( strcmp( argv[i], "--passive" ) == 0 )
 148                         {
 149                                 NGIRCd_Passive = true;
 150                                 ok = true;
 151                         }
 152 #ifdef SNIFFER
 153                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 154                         {
 155                                 NGIRCd_Sniffer = true;
 156                                 ok = true;
 157                         }
 158 #endif
 159                         if( strcmp( argv[i], "--version" ) == 0 )
 160                         {
 161                                 Show_Version( );
 162                                 exit( 1 );
 163                         }
 164                 }
 165                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 166                 {
 167                         /* Kurze Option */
 168                         for( n = 1; n < strlen( argv[i] ); n++ )
 169                         {
 170                                 ok = false;
 171 #ifdef DEBUG
 172                                 if( argv[i][n] == 'd' )
 173                                 {
 174                                         NGIRCd_Debug = true;
 175                                         ok = true;
 176                                 }
 177 #endif
 178                                 if( argv[i][n] == 'f' )
 179                                 {
 180                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 181                                         {
 182                                                 /* Ok, next character is a blank */
 183                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 184
 185                                                 /* go to the following parameter */
 186                                                 i++;
 187                                                 n = strlen( argv[i] );
 188                                                 ok = true;
 189                                         }
 190                                 }
 191                                 if( argv[i][n] == 'n' )
 192                                 {
 193                                         NGIRCd_NoDaemon = true;
 194                                         ok = true;
 195                                 }
 196                                 if( argv[i][n] == 'p' )
 197                                 {
 198                                         NGIRCd_Passive = true;
 199                                         ok = true;
 200                                 }
 201 #ifdef SNIFFER
 202                                 if( argv[i][n] == 's' )
 203                                 {
 204                                         NGIRCd_Sniffer = true;
 205                                         ok = true;
 206                                 }
 207 #endif
 208                                 if( argv[i][n] == 't' )
 209                                 {
 210                                         configtest = true;
 211                                         ok = true;
 212                                 }
 213
 214                                 if( ! ok )
 215                                 {
 216                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 217                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 218                                         exit( 1 );
 219                                 }
 220                         }
 221
 222                 }
 223                 if( ! ok )
 224                 {
 225                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 226                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 227                         exit( 1 );
 228                 }
 229         }
 230
 231         /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */
 232         NGIRCd_DebugLevel[0] = '\0';
 233 #ifdef DEBUG
 234         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 235 #endif
 236 #ifdef SNIFFER
 237         if( NGIRCd_Sniffer )
 238         {
 239                 NGIRCd_Debug = true;
 240                 strcpy( NGIRCd_DebugLevel, "2" );
 241         }
 242 #endif
 243
 244         /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */
 245         if( configtest )
 246         {
 247                 Show_Version( ); puts( "" );
 248                 exit( Conf_Test( ));
 249         }
 250
 251         while( ! NGIRCd_SignalQuit )
 252         {
 253                 /* Initialize global variables */
 254                 NGIRCd_Start = time( NULL );
 255                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 256
 257                 NGIRCd_SignalRehash = false;
 258                 NGIRCd_SignalRestart = false;
 259                 NGIRCd_SignalQuit = false;
 260
 261                 /* Initialize modules, part I */
 262                 Log_Init( ! NGIRCd_NoDaemon );
 263                 Conf_Init( );
 264
 265                 if (!NGIRCd_Init( NGIRCd_NoDaemon )) {
 266                         Log(LOG_WARNING, "Fatal: Initialization failed");
 267                         exit(1);
 268                 }
 269
 270                 /* Initialize modules, part II: these functions are eventually
 271                  * called with already dropped privileges ... */
 272                 Resolve_Init( );
 273                 Lists_Init( );
 274                 Channel_Init( );
 275                 Client_Init( );
 276 #ifdef RENDEZVOUS
 277                 Rendezvous_Init( );
 278 #endif
 279                 Conn_Init( );
 280
 281 #ifdef DEBUG
 282                 /* Redirect stderr handle to "error file" for debugging
 283                  * when not running in "no daemon" mode: */
 284                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 285 #endif
 286
 287                 /* Signal-Handler initialisieren */
 288                 Initialize_Signal_Handler( );
 289
 290                 /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd
 291                  * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 292                  * sind in doc/Protocol.txt beschrieben. */
 293 #ifdef IRCPLUS
 294                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 295 #ifdef ZLIB
 296                 strcat( NGIRCd_ProtoID, "Z" );
 297 #endif
 298                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 299 #else
 300                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 301 #endif
 302                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 303 #ifdef ZLIB
 304                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 305 #endif
 306                 Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 307
 308                 /* Vordefinierte Channels anlegen */
 309                 Channel_InitPredefined( );
 310
 311                 /* Listen-Ports initialisieren */
 312                 if( Conn_InitListeners( ) < 1 )
 313                 {
 314                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 315                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 316                         Pidfile_Delete( );
 317                         exit( 1 );
 318                 }
 319
 320                 /* Hauptschleife */
 321                 Conn_Handler( );
 322
 323                 /* Alles abmelden */
 324                 Conn_Exit( );
 325 #ifdef RENDEZVOUS
 326                 Rendezvous_Exit( );
 327 #endif
 328                 Client_Exit( );
 329                 Channel_Exit( );
 330                 Lists_Exit( );
 331                 Log_Exit( );
 332         }
 333         Pidfile_Delete( );
 334
 335         return 0;
 336 } /* main */
 337
 338
 339 /**
 340  * Generate ngIRCd "version string".
 341  * This string is generated once and then stored in NGIRCd_Version for
 342  * further usage, for example by the IRC command VERSION and the --version
 343  * command line switch.
 344  */
 345 LOCAL void
 346 Fill_Version( void )
 347 {
 348         NGIRCd_VersionAddition[0] = '\0';
 349
 350 #ifdef SYSLOG
 351         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 352 #endif
 353 #ifdef ZLIB
 354         if( NGIRCd_VersionAddition[0] )
 355                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 356
 357         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 358 #endif
 359 #ifdef TCPWRAP
 360         if( NGIRCd_VersionAddition[0] )
 361                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 362
 363         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 364 #endif
 365 #ifdef RENDEZVOUS
 366         if( NGIRCd_VersionAddition[0] )
 367                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 368
 369         strlcat( NGIRCd_VersionAddition, "RENDEZVOUS", sizeof NGIRCd_VersionAddition );
 370 #endif
 371 #ifdef IDENTAUTH
 372         if( NGIRCd_VersionAddition[0] )
 373                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 374
 375         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 376 #endif
 377 #ifdef DEBUG
 378         if( NGIRCd_VersionAddition[0] )
 379                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 380
 381         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 382 #endif
 383 #ifdef SNIFFER
 384         if( NGIRCd_VersionAddition[0] )
 385                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 386
 387         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 388 #endif
 389 #ifdef STRICT_RFC
 390         if( NGIRCd_VersionAddition[0] )
 391                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 392
 393         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 394 #endif
 395 #ifdef IRCPLUS
 396         if( NGIRCd_VersionAddition[0] )
 397                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 398
 399         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 400 #endif
 401
 402         if( NGIRCd_VersionAddition[0] )
 403                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 404
 405         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 406         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 407         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 408         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 409         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 410
 411 #ifdef CVSDATE
 412         snprintf( NGIRCd_Version, sizeof NGIRCd_Version,"%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition);
 413 #else
 414         snprintf( NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 415 #endif
 416 } /* Fill_Version */
 417
 418
 419 /**
 420  * Reload the server configuration file.
 421  */
 422 GLOBAL void
 423 NGIRCd_Rehash( void )
 424 {
 425         char old_name[CLIENT_ID_LEN];
 426
 427         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 428         NGIRCd_SignalRehash = false;
 429
 430         /* Close down all listening sockets */
 431         Conn_ExitListeners( );
 432
 433         /* Remember old server name */
 434         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 435
 436         /* Re-read configuration ... */
 437         Conf_Rehash( );
 438
 439         /* Recover old server name: it can't be changed during run-time */
 440         if( strcmp( old_name, Conf_ServerName ) != 0 )
 441         {
 442                 strcpy( Conf_ServerName, old_name );
 443                 Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
 444         }
 445
 446         /* Create new pre-defined channels */
 447         Channel_InitPredefined( );
 448
 449         /* Start listening on sockets */
 450         Conn_InitListeners( );
 451
 452         /* Sync configuration with established connections */
 453         Conn_SyncServerStruct( );
 454
 455         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 456 } /* NGIRCd_Rehash */
 457
 458
 459 /**
 460  * Initialize the signal handler.
 461  */
 462 LOCAL void
 463 Initialize_Signal_Handler( void )
 464 {
 465         /* Signal-Handler initialisieren: einige Signale
 466          * werden ignoriert, andere speziell behandelt. */
 467
 468 #ifdef HAVE_SIGACTION
 469         /* sigaction() ist vorhanden */
 470
 471         struct sigaction saction;
 472
 473         /* Signal-Struktur initialisieren */
 474         memset( &saction, 0, sizeof( saction ));
 475         saction.sa_handler = Signal_Handler;
 476 #ifdef SA_RESTART
 477         saction.sa_flags |= SA_RESTART;
 478 #endif
 479 #ifdef SA_NOCLDWAIT
 480         saction.sa_flags |= SA_NOCLDWAIT;
 481 #endif
 482
 483         /* Signal-Handler einhaengen */
 484         sigaction( SIGINT, &saction, NULL );
 485         sigaction( SIGQUIT, &saction, NULL );
 486         sigaction( SIGTERM, &saction, NULL);
 487         sigaction( SIGHUP, &saction, NULL);
 488         sigaction( SIGCHLD, &saction, NULL);
 489
 490         /* einige Signale ignorieren */
 491         saction.sa_handler = SIG_IGN;
 492         sigaction( SIGPIPE, &saction, NULL );
 493 #else
 494         /* kein sigaction() vorhanden */
 495
 496         /* Signal-Handler einhaengen */
 497         signal( SIGINT, Signal_Handler );
 498         signal( SIGQUIT, Signal_Handler );
 499         signal( SIGTERM, Signal_Handler );
 500         signal( SIGHUP, Signal_Handler );
 501         signal( SIGCHLD, Signal_Handler );
 502
 503         /* einige Signale ignorieren */
 504         signal( SIGPIPE, SIG_IGN );
 505 #endif
 506 } /* Initialize_Signal_Handler */
 507
 508
 509 /**
 510  * Signal handler of ngIRCd.
 511  * This function is called whenever ngIRCd catches a signal sent by the
 512  * user and/or the system to it. For example SIGTERM and SIGHUP.
 513  * @param Signal Number of the signal to handle.
 514  */
 515 LOCAL void
 516 Signal_Handler( int Signal )
 517 {
 518         switch( Signal )
 519         {
 520                 case SIGTERM:
 521                 case SIGINT:
 522                 case SIGQUIT:
 523                         /* wir soll(t)en uns wohl beenden ... */
 524                         NGIRCd_SignalQuit = true;
 525                         break;
 526                 case SIGHUP:
 527                         /* Konfiguration neu einlesen: */
 528                         NGIRCd_SignalRehash = true;
 529                         break;
 530                 case SIGCHLD:
 531                         /* Child-Prozess wurde beendet. Zombies vermeiden: */
 532                         while( waitpid( -1, NULL, WNOHANG ) > 0);
 533                         break;
 534 #ifdef DEBUG
 535                 default:
 536                         /* unbekanntes bzw. unbehandeltes Signal */
 537                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 538 #endif
 539         }
 540 } /* Signal_Handler */
 541
 542
 543 /**
 544  * Display copyright and version information of ngIRCd on the console.
 545  */
 546 LOCAL void
 547 Show_Version( void )
 548 {
 549         puts( NGIRCd_Version );
 550         puts( "Copyright (c)2001-2005 by Alexander Barton (<alex@barton.de>)." );
 551         puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
 552         puts( "This is free software; see the source for copying conditions. There is NO" );
 553         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 554 } /* Show_Version */
 555
 556
 557 /**
 558  * Display a short help text on the console.
 559  * This help depends on the configuration of the executable and only shows
 560  * options that are actually enabled.
 561  */
 562 LOCAL void
 563 Show_Help( void )
 564 {
 565 #ifdef DEBUG
 566         puts( "  -d, --debug        log extra debug messages" );
 567 #endif
 568         puts( "  -f, --config <f>   use file <f> as configuration file" );
 569         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 570         puts( "  -p, --passive      disable automatic connections to other servers" );
 571 #ifdef SNIFFER
 572         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 573 #endif
 574         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 575         puts( "      --version      output version information and exit" );
 576         puts( "      --help         display this help and exit" );
 577 } /* Show_Help */
 578
 579
 580 /**
 581  * Delete the file containing the process ID (PID).
 582  */
 583 LOCAL void
 584 Pidfile_Delete( void )
 585 {
 586         /* Pidfile configured? */
 587         if( ! Conf_PidFile[0] ) return;
 588
 589 #ifdef DEBUG
 590         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 591 #endif
 592
 593         if( unlink( Conf_PidFile ))
 594                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 595 } /* Pidfile_Delete */
 596
 597
 598 /**
 599  * Create the file containing the process ID of ngIRCd ("PID file").
 600  * @param pid The process ID to be stored in this file.
 601  */
 602 LOCAL void
 603 Pidfile_Create( long pid )
 604 {
 605         int pidfd;
 606         char pidbuf[64];
 607         int len;
 608
 609         /* Pidfile configured? */
 610         if( ! Conf_PidFile[0] ) return;
 611
 612 #ifdef DEBUG
 613         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 614 #endif
 615
 616         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 617         if ( pidfd < 0 ) {
 618                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 619                 return;
 620         }
 621
 622         len = snprintf( pidbuf, sizeof pidbuf, "%ld\n", pid );
 623         if (len < 0|| len < (int)sizeof pid) {
 624                 Log( LOG_ERR, "Error converting pid");
 625                 return;
 626         }
 627
 628         if( write( pidfd, pidbuf, len) != len)
 629                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 630
 631         if( close(pidfd) != 0 )
 632                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 633 } /* Pidfile_Create */
 634
 635
 636 /**
 637  * Redirect stdin, stdout and stderr to apropriate file handles.
 638  */
 639 LOCAL void
 640 Setup_FDStreams( void )
 641 {
 642         int fd;
 643
 644         /* Test if we can open /dev/null for reading and writing. If not
 645          * we are most probably chrooted already and the server has been
 646          * restarted. So we simply don't try to redirect stdXXX ... */
 647         fd = open( "/dev/null", O_RDWR );
 648         if ( fd < 0 ) {
 649                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 650                 return;
 651         }
 652
 653         fflush(stdout);
 654         fflush(stderr);
 655
 656         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 657         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 658
 659         /* Close newly opened file descriptor if not stdin/out/err */
 660         if( fd > 2 ) close( fd );
 661 } /* Setup_FDStreams */
 662
 663
 664 LOCAL bool
 665 NGIRCd_getNobodyID(unsigned int *uid, unsigned int *gid )
 666 {
 667         struct passwd *pwd;
 668
 669         pwd = getpwnam("nobody");
 670         if (!pwd) return false;
 671
 672         if ( !pwd->pw_uid || !pwd->pw_gid)
 673                 return false;
 674
 675         *uid = pwd->pw_uid;
 676         *gid = pwd->pw_gid;
 677         endpwent();
 678
 679         return true;
 680 }
 681
 682
 683 LOCAL bool
 684 NGIRCd_Init( bool NGIRCd_NoDaemon )
 685 {
 686         static bool initialized;
 687         bool chrooted = false;
 688         struct passwd *pwd;
 689         struct group *grp;
 690         int real_errno;
 691         long pid;
 692
 693         if (initialized)
 694                 return true;
 695
 696         if( Conf_Chroot[0] ) {
 697                 if( chdir( Conf_Chroot ) != 0 ) {
 698                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 699                         return false;
 700                 }
 701
 702                 if( chroot( Conf_Chroot ) != 0 ) {
 703                         if (errno != EPERM) {
 704                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 705                                                                 Conf_Chroot, strerror( errno ));
 706
 707                                 return false;
 708                         }
 709                 } else {
 710                         chrooted = true;
 711                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 712                 }
 713         }
 714
 715         if ( Conf_UID == 0 ) {
 716                 Log( LOG_INFO, "Conf_UID must not be 0, switching to user nobody", Conf_UID );
 717
 718                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID )) {
 719                         Log( LOG_WARNING, "Could not get uid/gid of user nobody: %s",
 720                                         errno ? strerror(errno) : "not found" );
 721                         return false;
 722                 }
 723         }
 724
 725         if( setgid( Conf_GID ) != 0 ) {
 726                 real_errno = errno;
 727                 Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 728                 if (real_errno != EPERM)
 729                         return false;
 730         }
 731
 732         if( setuid( Conf_UID ) != 0 ) {
 733                 real_errno = errno;
 734                 Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
 735                 if (real_errno != EPERM)
 736                         return false;
 737         }
 738
 739         initialized = true;
 740
 741         /* Normally a child process is forked which isn't any longer
 742          * connected to ther controlling terminal. Use "--nodaemon"
 743          * to disable this "daemon mode" (useful for debugging). */
 744         if ( ! NGIRCd_NoDaemon ) {
 745                 pid = (long)fork( );
 746                 if( pid > 0 ) {
 747                         /* "Old" process: exit. */
 748                         exit( 0 );
 749                 }
 750                 if( pid < 0 ) {
 751                         /* Error!? */
 752                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 753                                                                 PACKAGE_NAME, strerror( errno ));
 754                         exit( 1 );
 755                 }
 756
 757                 /* New child process */
 758                 (void)setsid( );
 759                 chdir( "/" );
 760
 761                 /* Detach stdin, stdout and stderr */
 762                 Setup_FDStreams( );
 763         }
 764         pid = getpid();
 765
 766         Pidfile_Create( pid );
 767
 768         /* check uid we are running as, can be different from values configured (e.g. if we were already
 769         started with a uid > 0 */
 770         Conf_UID = getuid();
 771         Conf_GID = getgid();
 772
 773         assert( Conf_GID > 0);
 774         assert( Conf_UID > 0);
 775
 776         pwd = getpwuid( Conf_UID );
 777         grp = getgrgid( Conf_GID );
 778         Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 779                                 pwd ? pwd->pw_name : "unknown", Conf_UID,
 780                                 grp ? grp->gr_name : "unknown", Conf_GID, pid);
 781
 782         if ( chrooted ) {
 783                 Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
 784                 return true;
 785         } else {
 786                 Log( LOG_INFO, "Not running chrooted." );
 787         }
 788
 789         /* Change working directory to home directory of the user
 790          * we are running as (only when running in daemon mode and not in chroot) */
 791
 792         if ( pwd ) {
 793                 if (!NGIRCd_NoDaemon ) {
 794                         if( chdir( pwd->pw_dir ) == 0 )
 795                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 796                         else
 797                                 Log( LOG_ERR, "Can't change working directory to \"%s\": %s",
 798                                                                 pwd->pw_dir, strerror( errno ));
 799                 }
 800         } else {
 801                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 802         }
 803
 804 return true;
 805 }
 806
 807 /* -eof- */