src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de).
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * The main program, including the C function main() which is called
  18  * by the loader of the operating system.
  19  */
  20
  21 #include "imp.h"
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34 #include <pwd.h>
  35 #include <grp.h>
  36
  37 #if defined(DEBUG) && defined(HAVE_MTRACE)
  38 #include <mcheck.h>
  39 #endif
  40
  41 #include "defines.h"
  42 #include "resolve.h"
  43 #include "conn.h"
  44 #include "conf-ssl.h"
  45 #include "client.h"
  46 #include "channel.h"
  47 #include "conf.h"
  48 #include "lists.h"
  49 #include "log.h"
  50 #include "parse.h"
  51 #include "irc.h"
  52
  53 #ifdef ZEROCONF
  54 #include "rendezvous.h"
  55 #endif
  56
  57 #include "exp.h"
  58 #include "ngircd.h"
  59
  60
  61 static void Initialize_Signal_Handler PARAMS(( void ));
  62 static void Signal_Handler PARAMS(( int Signal ));
  63
  64 static void Show_Version PARAMS(( void ));
  65 static void Show_Help PARAMS(( void ));
  66
  67 static void Pidfile_Create PARAMS(( pid_t pid ));
  68 static void Pidfile_Delete PARAMS(( void ));
  69
  70 static void Fill_Version PARAMS(( void ));
  71
  72 static void Setup_FDStreams PARAMS(( void ));
  73
  74 static bool NGIRCd_Init PARAMS(( bool ));
  75
  76 /**
  77  * The main() function of ngIRCd.
  78  * Here all starts: this function is called by the operating system loader,
  79  * it is the first portion of code executed of ngIRCd.
  80  * @param argc The number of arguments passed to ngIRCd on the command line.
  81  * @param argv An array containing all the arguments passed to ngIRCd.
  82  * @return Global exit code of ngIRCd, zero on success.
  83  */
  84 GLOBAL int
  85 main( int argc, const char *argv[] )
  86 {
  87         bool ok, configtest = false;
  88         bool NGIRCd_NoDaemon = false;
  89         int i;
  90         size_t n;
  91
  92 #if defined(DEBUG) && defined(HAVE_MTRACE)
  93         /* enable GNU libc memory tracing when running in debug mode
  94          * and functionality available */
  95         mtrace();
  96 #endif
  97
  98         umask( 0077 );
  99
 100         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
 101         NGIRCd_Passive = false;
 102 #ifdef DEBUG
 103         NGIRCd_Debug = false;
 104 #endif
 105 #ifdef SNIFFER
 106         NGIRCd_Sniffer = false;
 107 #endif
 108         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 109         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 110
 111         Fill_Version( );
 112
 113         /* parse conmmand line */
 114         for( i = 1; i < argc; i++ )
 115         {
 116                 ok = false;
 117                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 118                 {
 119                         /* long option */
 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                         /* short 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 (for IRCs "VERSION" command) */
 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         if( configtest )
 257         {
 258                 Show_Version( ); puts( "" );
 259                 exit( Conf_Test( ));
 260         }
 261
 262         while( ! NGIRCd_SignalQuit )
 263         {
 264                 /* Initialize global variables */
 265                 NGIRCd_Start = time( NULL );
 266                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 267
 268                 NGIRCd_SignalRehash = false;
 269                 NGIRCd_SignalRestart = false;
 270                 NGIRCd_SignalQuit = false;
 271
 272                 /* Initialize modules, part I */
 273                 Log_Init( ! NGIRCd_NoDaemon );
 274                 Conf_Init( );
 275
 276                 /* Initialize the "main program": chroot environment, user and
 277                  * group ID, ... */
 278                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 279                         Log(LOG_ALERT, "Fatal: Initialization failed");
 280                         exit(1);
 281                 }
 282
 283                 /* Initialize modules, part II: these functions are eventually
 284                  * called with already dropped privileges ... */
 285                 Channel_Init( );
 286                 Client_Init( );
 287 #ifdef ZEROCONF
 288                 Rendezvous_Init( );
 289 #endif
 290                 Conn_Init( );
 291
 292 #ifdef DEBUG
 293                 /* Redirect stderr handle to "error file" for debugging
 294                  * when not running in "no daemon" mode: */
 295                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 296 #endif
 297
 298                 Initialize_Signal_Handler( );
 299
 300                 /*
 301                  * create protocol and server identification.
 302                  * The syntax used by ngIRCd in PASS commands and the extended flags
 303                  * are described in doc/Protocol.txt
 304                  */
 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                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 319
 320                 Channel_InitPredefined( );
 321
 322                 if( Conn_InitListeners( ) < 1 )
 323                 {
 324                         Log( LOG_ALERT, "Server isn't listening on a single port!" );
 325                         Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 326                         Pidfile_Delete( );
 327                         exit( 1 );
 328                 }
 329
 330                 /* Hauptschleife */
 331                 Conn_Handler( );
 332
 333                 /* Alles abmelden */
 334                 Conn_Exit( );
 335 #ifdef ZEROCONF
 336                 Rendezvous_Exit( );
 337 #endif
 338                 Client_Exit( );
 339                 Channel_Exit( );
 340                 Log_Exit( );
 341         }
 342         Pidfile_Delete( );
 343
 344         return 0;
 345 } /* main */
 346
 347
 348 /**
 349  * Generate ngIRCd "version string".
 350  * This string is generated once and then stored in NGIRCd_Version for
 351  * further usage, for example by the IRC command VERSION and the --version
 352  * command line switch.
 353  */
 354 static void
 355 Fill_Version( void )
 356 {
 357         NGIRCd_VersionAddition[0] = '\0';
 358
 359 #ifdef SYSLOG
 360         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 361 #endif
 362 #ifdef ZLIB
 363         if( NGIRCd_VersionAddition[0] )
 364                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 365
 366         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 367 #endif
 368 #ifdef SSL_SUPPORT
 369         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 370         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 371 #endif
 372 #ifdef TCPWRAP
 373         if( NGIRCd_VersionAddition[0] )
 374                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 375
 376         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 377 #endif
 378 #ifdef ZEROCONF
 379         if( NGIRCd_VersionAddition[0] )
 380                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 381
 382         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 383 #endif
 384 #ifdef IDENTAUTH
 385         if( NGIRCd_VersionAddition[0] )
 386                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 387
 388         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 389 #endif
 390 #ifdef DEBUG
 391         if( NGIRCd_VersionAddition[0] )
 392                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 393
 394         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 395 #endif
 396 #ifdef SNIFFER
 397         if( NGIRCd_VersionAddition[0] )
 398                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 399
 400         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 401 #endif
 402 #ifdef STRICT_RFC
 403         if( NGIRCd_VersionAddition[0] )
 404                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 405
 406         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 407 #endif
 408 #ifdef IRCPLUS
 409         if( NGIRCd_VersionAddition[0] )
 410                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 411
 412         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 413 #endif
 414 #ifdef WANT_IPV6
 415         if (NGIRCd_VersionAddition[0])
 416                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 417
 418         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 419 #endif
 420         if( NGIRCd_VersionAddition[0] )
 421                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 422
 423         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 424         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 425         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 426         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 427         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 428
 429         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 430                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 431         } /* Fill_Version */
 432
 433
 434 /**
 435  * Reload the server configuration file.
 436  */
 437 GLOBAL void
 438 NGIRCd_Rehash( void )
 439 {
 440         char old_name[CLIENT_ID_LEN];
 441         unsigned old_nicklen;
 442
 443         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 444         NGIRCd_SignalRehash = false;
 445
 446         /* Remember old server name and nick name length */
 447         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 448         old_nicklen = Conf_MaxNickLength;
 449
 450         /* Re-read configuration ... */
 451         if (!Conf_Rehash( ))
 452                 return;
 453
 454         /* Close down all listening sockets */
 455         Conn_ExitListeners( );
 456
 457         /* Recover old server name and nick name length: these values can't
 458          * be changed during run-time */
 459         if (strcmp(old_name, Conf_ServerName) != 0 ) {
 460                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
 461                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
 462         }
 463         if (old_nicklen != Conf_MaxNickLength) {
 464                 Conf_MaxNickLength = old_nicklen;
 465                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 466         }
 467
 468         /* Create new pre-defined channels */
 469         Channel_InitPredefined( );
 470
 471         if (!ConnSSL_InitLibrary())
 472                 Log(LOG_WARNING, "Re-Initializing SSL failed, using old keys");
 473
 474         /* Start listening on sockets */
 475         Conn_InitListeners( );
 476
 477         /* Sync configuration with established connections */
 478         Conn_SyncServerStruct( );
 479
 480         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 481 } /* NGIRCd_Rehash */
 482
 483
 484 /**
 485  * Initialize the signal handler.
 486  */
 487 static void
 488 Initialize_Signal_Handler( void )
 489 {
 490 #ifdef HAVE_SIGACTION
 491         struct sigaction saction;
 492
 493         memset( &saction, 0, sizeof( saction ));
 494         saction.sa_handler = Signal_Handler;
 495 #ifdef SA_RESTART
 496         saction.sa_flags |= SA_RESTART;
 497 #endif
 498 #ifdef SA_NOCLDWAIT
 499         saction.sa_flags |= SA_NOCLDWAIT;
 500 #endif
 501
 502         sigaction(SIGINT, &saction, NULL);
 503         sigaction(SIGQUIT, &saction, NULL);
 504         sigaction(SIGTERM, &saction, NULL);
 505         sigaction(SIGHUP, &saction, NULL);
 506         sigaction(SIGCHLD, &saction, NULL);
 507
 508         /* we handle write errors properly; ignore SIGPIPE */
 509         saction.sa_handler = SIG_IGN;
 510         sigaction(SIGPIPE, &saction, NULL);
 511 #else
 512         signal(SIGINT, Signal_Handler);
 513         signal(SIGQUIT, Signal_Handler);
 514         signal(SIGTERM, Signal_Handler);
 515         signal(SIGHUP, Signal_Handler);
 516         signal(SIGCHLD, Signal_Handler);
 517
 518         signal(SIGPIPE, SIG_IGN);
 519 #endif
 520 } /* Initialize_Signal_Handler */
 521
 522
 523 /**
 524  * Signal handler of ngIRCd.
 525  * This function is called whenever ngIRCd catches a signal sent by the
 526  * user and/or the system to it. For example SIGTERM and SIGHUP.
 527  * @param Signal Number of the signal to handle.
 528  */
 529 static void
 530 Signal_Handler( int Signal )
 531 {
 532         switch( Signal )
 533         {
 534                 case SIGTERM:
 535                 case SIGINT:
 536                 case SIGQUIT:
 537                         /* shut down sever */
 538                         NGIRCd_SignalQuit = true;
 539                         break;
 540                 case SIGHUP:
 541                         /* re-read configuration */
 542                         NGIRCd_SignalRehash = true;
 543                         break;
 544                 case SIGCHLD:
 545                         /* child-process exited, avoid zombies */
 546                         while (waitpid( -1, NULL, WNOHANG) > 0)
 547                                 ;
 548                         break;
 549 #ifdef DEBUG
 550                 default:
 551                         /* unbekanntes bzw. unbehandeltes Signal */
 552                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 553 #endif
 554         }
 555 } /* Signal_Handler */
 556
 557
 558 /**
 559  * Display copyright and version information of ngIRCd on the console.
 560  */
 561 static void
 562 Show_Version( void )
 563 {
 564         puts( NGIRCd_Version );
 565         puts( "Copyright (c)2001-2010 Alexander Barton (<alex@barton.de>) and Contributors." );
 566         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 567         puts( "This is free software; see the source for copying conditions. There is NO" );
 568         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 569 } /* Show_Version */
 570
 571
 572 /**
 573  * Display a short help text on the console.
 574  * This help depends on the configuration of the executable and only shows
 575  * options that are actually enabled.
 576  */
 577 static void
 578 Show_Help( void )
 579 {
 580 #ifdef DEBUG
 581         puts( "  -d, --debug        log extra debug messages" );
 582 #endif
 583         puts( "  -f, --config <f>   use file <f> as configuration file" );
 584         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 585         puts( "  -p, --passive      disable automatic connections to other servers" );
 586 #ifdef SNIFFER
 587         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 588 #endif
 589         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 590         puts( "  -V, --version      output version information and exit" );
 591         puts( "  -h, --help         display this help and exit" );
 592 } /* Show_Help */
 593
 594
 595 /**
 596  * Delete the file containing the process ID (PID).
 597  */
 598 static void
 599 Pidfile_Delete( void )
 600 {
 601         /* Pidfile configured? */
 602         if( ! Conf_PidFile[0] ) return;
 603
 604 #ifdef DEBUG
 605         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 606 #endif
 607
 608         if( unlink( Conf_PidFile ))
 609                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 610 } /* Pidfile_Delete */
 611
 612
 613 /**
 614  * Create the file containing the process ID of ngIRCd ("PID file").
 615  * @param pid The process ID to be stored in this file.
 616  */
 617 static void
 618 Pidfile_Create(pid_t pid)
 619 {
 620         int pidfd;
 621         char pidbuf[64];
 622         int len;
 623
 624         /* Pidfile configured? */
 625         if( ! Conf_PidFile[0] ) return;
 626
 627 #ifdef DEBUG
 628         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 629 #endif
 630
 631         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 632         if ( pidfd < 0 ) {
 633                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 634                 return;
 635         }
 636
 637         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 638         if (len < 0 || len >= (int)sizeof pidbuf) {
 639                 Log( LOG_ERR, "Error converting pid");
 640                 return;
 641         }
 642
 643         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 644                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 645
 646         if( close(pidfd) != 0 )
 647                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 648 } /* Pidfile_Create */
 649
 650
 651 /**
 652  * Redirect stdin, stdout and stderr to apropriate file handles.
 653  */
 654 static void
 655 Setup_FDStreams( void )
 656 {
 657         int fd;
 658
 659         /* Test if we can open /dev/null for reading and writing. If not
 660          * we are most probably chrooted already and the server has been
 661          * restarted. So we simply don't try to redirect stdXXX ... */
 662         fd = open( "/dev/null", O_RDWR );
 663         if ( fd < 0 ) {
 664                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 665                 return;
 666         }
 667
 668         fflush(stdout);
 669         fflush(stderr);
 670
 671         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 672         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 673
 674         /* Close newly opened file descriptor if not stdin/out/err */
 675         if( fd > 2 ) close( fd );
 676 } /* Setup_FDStreams */
 677
 678
 679 static bool
 680 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 681 {
 682         struct passwd *pwd;
 683
 684 #ifdef __CYGWIN__
 685         /* Cygwin kludge.
 686          * It can return EINVAL instead of EPERM
 687          * so, if we are already unprivileged,
 688          * use id of current user.
 689          */
 690         if (geteuid() && getuid()) {
 691                 *uid = getuid();
 692                 *gid = getgid();
 693                 return true;
 694         }
 695 #endif
 696
 697         pwd = getpwnam("nobody");
 698         if (!pwd) return false;
 699
 700         if ( !pwd->pw_uid || !pwd->pw_gid)
 701                 return false;
 702
 703         *uid = pwd->pw_uid;
 704         *gid = pwd->pw_gid;
 705         endpwent();
 706
 707         return true;
 708 }
 709
 710
 711 static bool
 712 NGIRCd_Init( bool NGIRCd_NoDaemon )
 713 {
 714         static bool initialized;
 715         bool chrooted = false;
 716         struct passwd *pwd;
 717         struct group *grp;
 718         int real_errno;
 719         pid_t pid;
 720
 721         if (initialized)
 722                 return true;
 723
 724         if (!ConnSSL_InitLibrary())
 725                 Log(LOG_WARNING,
 726                     "Warning: Error during SSL initialization, continuing ...");
 727
 728         if( Conf_Chroot[0] ) {
 729                 if( chdir( Conf_Chroot ) != 0 ) {
 730                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 731                         return false;
 732                 }
 733
 734                 if( chroot( Conf_Chroot ) != 0 ) {
 735                         if (errno != EPERM) {
 736                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 737                                                                 Conf_Chroot, strerror( errno ));
 738
 739                                 return false;
 740                         }
 741                 } else {
 742                         chrooted = true;
 743                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 744                 }
 745         }
 746
 747         if (Conf_UID == 0) {
 748                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 749
 750                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 751                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 752                                         errno ? strerror(errno) : "not found" );
 753                         return false;
 754                 }
 755         }
 756
 757         if (getgid() != Conf_GID) {
 758                 /* Change group ID */
 759                 if (setgid(Conf_GID) != 0) {
 760                         real_errno = errno;
 761                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 762                         if (real_errno != EPERM)
 763                                 return false;
 764                 }
 765         }
 766
 767         if (getuid() != Conf_UID) {
 768                 /* Change user ID */
 769                 if (setuid(Conf_UID) != 0) {
 770                         real_errno = errno;
 771                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 772                         if (real_errno != EPERM)
 773                                 return false;
 774                 }
 775         }
 776
 777         initialized = true;
 778
 779         /* Normally a child process is forked which isn't any longer
 780          * connected to ther controlling terminal. Use "--nodaemon"
 781          * to disable this "daemon mode" (useful for debugging). */
 782         if ( ! NGIRCd_NoDaemon ) {
 783                 pid = fork( );
 784                 if( pid > 0 ) {
 785                         /* "Old" process: exit. */
 786                         exit( 0 );
 787                 }
 788                 if( pid < 0 ) {
 789                         /* Error!? */
 790                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 791                                                                 PACKAGE_NAME, strerror( errno ));
 792                         exit( 1 );
 793                 }
 794
 795                 /* New child process */
 796 #ifndef NeXT
 797                 (void)setsid( );
 798 #else
 799                 setpgrp(0, getpid());
 800 #endif
 801                 chdir( "/" );
 802
 803                 /* Detach stdin, stdout and stderr */
 804                 Setup_FDStreams( );
 805         }
 806         pid = getpid();
 807
 808         Pidfile_Create( pid );
 809
 810         /* Check UID/GID we are running as, can be different from values
 811          * configured (e. g. if we were already started with a UID>0. */
 812         Conf_UID = getuid();
 813         Conf_GID = getgid();
 814
 815         pwd = getpwuid( Conf_UID );
 816         grp = getgrgid( Conf_GID );
 817
 818         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 819                                 pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 820                                 grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 821
 822         if (chrooted) {
 823                 Log(LOG_INFO, "Running with root directory \"%s\".",
 824                     Conf_Chroot );
 825                 return true;
 826         } else
 827                 Log(LOG_INFO, "Not running with changed root directory.");
 828
 829         /* Change working directory to home directory of the user
 830          * we are running as (only when running in daemon mode and not in chroot) */
 831
 832         if ( pwd ) {
 833                 if (!NGIRCd_NoDaemon ) {
 834                         if( chdir( pwd->pw_dir ) == 0 )
 835                                 Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
 836                         else
 837                                 Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
 838                                                                 pwd->pw_dir, strerror( errno ));
 839                 }
 840         } else {
 841                 Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
 842         }
 843
 844 return true;
 845 }
 846
 847 /* -eof- */