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 "conn.h"
  43 #include "conf-ssl.h"
  44 #include "channel.h"
  45 #include "conf.h"
  46 #include "lists.h"
  47 #include "log.h"
  48 #include "parse.h"
  49 #include "irc.h"
  50
  51 #ifdef ZEROCONF
  52 #include "rendezvous.h"
  53 #endif
  54
  55 #include "exp.h"
  56 #include "ngircd.h"
  57
  58
  59 static void Initialize_Signal_Handler PARAMS(( void ));
  60 static void Signal_Handler PARAMS(( int Signal ));
  61
  62 static void Show_Version PARAMS(( void ));
  63 static void Show_Help PARAMS(( void ));
  64
  65 static void Pidfile_Create PARAMS(( pid_t pid ));
  66 static void Pidfile_Delete PARAMS(( void ));
  67
  68 static void Fill_Version PARAMS(( void ));
  69
  70 static void Setup_FDStreams PARAMS(( void ));
  71
  72 static 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 #if defined(DEBUG) && defined(HAVE_MTRACE)
  91         /* enable GNU libc memory tracing when running in debug mode
  92          * and functionality available */
  93         mtrace();
  94 #endif
  95
  96         umask( 0077 );
  97
  98         NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
  99         NGIRCd_Passive = false;
 100 #ifdef DEBUG
 101         NGIRCd_Debug = false;
 102 #endif
 103 #ifdef SNIFFER
 104         NGIRCd_Sniffer = false;
 105 #endif
 106         strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 107         strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
 108
 109         Fill_Version( );
 110
 111         /* parse conmmand line */
 112         for( i = 1; i < argc; i++ )
 113         {
 114                 ok = false;
 115                 if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 116                 {
 117                         /* long option */
 118                         if( strcmp( argv[i], "--config" ) == 0 )
 119                         {
 120                                 if( i + 1 < argc )
 121                                 {
 122                                         /* Ok, there's an parameter left */
 123                                         strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 124
 125                                         /* next parameter */
 126                                         i++; ok = true;
 127                                 }
 128                         }
 129                         if( strcmp( argv[i], "--configtest" ) == 0 )
 130                         {
 131                                 configtest = true;
 132                                 ok = true;
 133                         }
 134 #ifdef DEBUG
 135                         if( strcmp( argv[i], "--debug" ) == 0 )
 136                         {
 137                                 NGIRCd_Debug = true;
 138                                 ok = true;
 139                         }
 140 #endif
 141                         if( strcmp( argv[i], "--help" ) == 0 )
 142                         {
 143                                 Show_Version( );
 144                                 puts( "" ); Show_Help( ); puts( "" );
 145                                 exit( 1 );
 146                         }
 147                         if( strcmp( argv[i], "--nodaemon" ) == 0 )
 148                         {
 149                                 NGIRCd_NoDaemon = true;
 150                                 ok = true;
 151                         }
 152                         if( strcmp( argv[i], "--passive" ) == 0 )
 153                         {
 154                                 NGIRCd_Passive = true;
 155                                 ok = true;
 156                         }
 157 #ifdef SNIFFER
 158                         if( strcmp( argv[i], "--sniffer" ) == 0 )
 159                         {
 160                                 NGIRCd_Sniffer = true;
 161                                 ok = true;
 162                         }
 163 #endif
 164                         if( strcmp( argv[i], "--version" ) == 0 )
 165                         {
 166                                 Show_Version( );
 167                                 exit( 1 );
 168                         }
 169                 }
 170                 else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 171                 {
 172                         /* short option */
 173                         for( n = 1; n < strlen( argv[i] ); n++ )
 174                         {
 175                                 ok = false;
 176 #ifdef DEBUG
 177                                 if (argv[i][n] == 'd') {
 178                                         NGIRCd_Debug = true;
 179                                         ok = true;
 180                                 }
 181 #endif
 182                                 if (argv[i][n] == 'f') {
 183                                         if(( ! argv[i][n + 1] ) && ( i + 1 < argc ))
 184                                         {
 185                                                 /* Ok, next character is a blank */
 186                                                 strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 187
 188                                                 /* go to the following parameter */
 189                                                 i++;
 190                                                 n = strlen( argv[i] );
 191                                                 ok = true;
 192                                         }
 193                                 }
 194
 195                                 if (argv[i][n] == 'h') {
 196                                         Show_Version();
 197                                         puts(""); Show_Help(); puts("");
 198                                         exit(1);
 199                                 }
 200
 201                                 if (argv[i][n] == 'n') {
 202                                         NGIRCd_NoDaemon = true;
 203                                         ok = true;
 204                                 }
 205                                 if (argv[i][n] == 'p') {
 206                                         NGIRCd_Passive = true;
 207                                         ok = true;
 208                                 }
 209 #ifdef SNIFFER
 210                                 if (argv[i][n] == 's') {
 211                                         NGIRCd_Sniffer = true;
 212                                         ok = true;
 213                                 }
 214 #endif
 215                                 if (argv[i][n] == 't') {
 216                                         configtest = true;
 217                                         ok = true;
 218                                 }
 219
 220                                 if (argv[i][n] == 'V') {
 221                                         Show_Version();
 222                                         exit(1);
 223                                 }
 224
 225                                 if (! ok) {
 226                                         printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] );
 227                                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 228                                         exit( 1 );
 229                                 }
 230                         }
 231
 232                 }
 233                 if( ! ok )
 234                 {
 235                         printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] );
 236                         printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME );
 237                         exit( 1 );
 238                 }
 239         }
 240
 241         /* Debug-Level (for IRCs "VERSION" command) */
 242         NGIRCd_DebugLevel[0] = '\0';
 243 #ifdef DEBUG
 244         if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
 245 #endif
 246 #ifdef SNIFFER
 247         if( NGIRCd_Sniffer )
 248         {
 249                 NGIRCd_Debug = true;
 250                 strcpy( NGIRCd_DebugLevel, "2" );
 251         }
 252 #endif
 253
 254         if( configtest )
 255         {
 256                 Show_Version( ); puts( "" );
 257                 exit( Conf_Test( ));
 258         }
 259
 260         while( ! NGIRCd_SignalQuit )
 261         {
 262                 /* Initialize global variables */
 263                 NGIRCd_Start = time( NULL );
 264                 (void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 265
 266                 NGIRCd_SignalRehash = false;
 267                 NGIRCd_SignalRestart = false;
 268                 NGIRCd_SignalQuit = false;
 269
 270                 /* Initialize modules, part I */
 271                 Log_Init( ! NGIRCd_NoDaemon );
 272                 Conf_Init( );
 273
 274                 /* Initialize the "main program": chroot environment, user and
 275                  * group ID, ... */
 276                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 277                         Log(LOG_ALERT, "Fatal: Initialization failed");
 278                         exit(1);
 279                 }
 280
 281                 /* Initialize modules, part II: these functions are eventually
 282                  * called with already dropped privileges ... */
 283                 Channel_Init( );
 284                 Client_Init( );
 285 #ifdef ZEROCONF
 286                 Rendezvous_Init( );
 287 #endif
 288                 Conn_Init( );
 289
 290 #ifdef DEBUG
 291                 /* Redirect stderr handle to "error file" for debugging
 292                  * when not running in "no daemon" mode: */
 293                 if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( );
 294 #endif
 295
 296                 Initialize_Signal_Handler( );
 297
 298                 /*
 299                  * create protocol and server identification.
 300                  * The syntax used by ngIRCd in PASS commands and the extended flags
 301                  * are described in doc/Protocol.txt
 302                  */
 303 #ifdef IRCPLUS
 304                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 305 #ifdef ZLIB
 306                 strcat( NGIRCd_ProtoID, "Z" );
 307 #endif
 308                 if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 309 #else
 310                 snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 311 #endif
 312                 strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 313 #ifdef ZLIB
 314                 strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 315 #endif
 316                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 317
 318                 Channel_InitPredefined( );
 319
 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 SSL_SUPPORT
 367         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 368         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 369 #endif
 370 #ifdef TCPWRAP
 371         if( NGIRCd_VersionAddition[0] )
 372                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 373
 374         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 375 #endif
 376 #ifdef ZEROCONF
 377         if( NGIRCd_VersionAddition[0] )
 378                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 379
 380         strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 381 #endif
 382 #ifdef IDENTAUTH
 383         if( NGIRCd_VersionAddition[0] )
 384                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 385
 386         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 387 #endif
 388 #ifdef DEBUG
 389         if( NGIRCd_VersionAddition[0] )
 390                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 391
 392         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 393 #endif
 394 #ifdef SNIFFER
 395         if( NGIRCd_VersionAddition[0] )
 396                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 397
 398         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 399 #endif
 400 #ifdef STRICT_RFC
 401         if( NGIRCd_VersionAddition[0] )
 402                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 403
 404         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 405 #endif
 406 #ifdef IRCPLUS
 407         if( NGIRCd_VersionAddition[0] )
 408                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 409
 410         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 411 #endif
 412 #ifdef WANT_IPV6
 413         if (NGIRCd_VersionAddition[0])
 414                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 415
 416         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 417 #endif
 418         if( NGIRCd_VersionAddition[0] )
 419                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 420
 421         strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 422         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 423         strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
 424         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 425         strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition ));
 426
 427         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 428                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 429         } /* Fill_Version */
 430
 431
 432 /**
 433  * Reload the server configuration file.
 434  */
 435 GLOBAL void
 436 NGIRCd_Rehash( void )
 437 {
 438         char old_name[CLIENT_ID_LEN];
 439         unsigned old_nicklen;
 440
 441         Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
 442         NGIRCd_SignalRehash = false;
 443
 444         /* Remember old server name and nick name length */
 445         strlcpy( old_name, Conf_ServerName, sizeof old_name );
 446         old_nicklen = Conf_MaxNickLength;
 447
 448         /* Re-read configuration ... */
 449         if (!Conf_Rehash( ))
 450                 return;
 451
 452         /* Close down all listening sockets */
 453         Conn_ExitListeners( );
 454
 455         /* Recover old server name and nick name length: these values can't
 456          * be changed during run-time */
 457         if (strcmp(old_name, Conf_ServerName) != 0 ) {
 458                 strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
 459                 Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
 460         }
 461         if (old_nicklen != Conf_MaxNickLength) {
 462                 Conf_MaxNickLength = old_nicklen;
 463                 Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 464         }
 465
 466         /* Create new pre-defined channels */
 467         Channel_InitPredefined( );
 468
 469         if (!ConnSSL_InitLibrary())
 470                 Log(LOG_WARNING, "Re-Initializing SSL failed, using old keys");
 471
 472         /* Start listening on sockets */
 473         Conn_InitListeners( );
 474
 475         /* Sync configuration with established connections */
 476         Conn_SyncServerStruct( );
 477
 478         Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." );
 479 } /* NGIRCd_Rehash */
 480
 481
 482 /**
 483  * Initialize the signal handler.
 484  */
 485 static void
 486 Initialize_Signal_Handler( void )
 487 {
 488 #ifdef HAVE_SIGACTION
 489         struct sigaction saction;
 490
 491         memset( &saction, 0, sizeof( saction ));
 492         saction.sa_handler = Signal_Handler;
 493 #ifdef SA_RESTART
 494         saction.sa_flags |= SA_RESTART;
 495 #endif
 496 #ifdef SA_NOCLDWAIT
 497         saction.sa_flags |= SA_NOCLDWAIT;
 498 #endif
 499
 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         /* we handle write errors properly; ignore SIGPIPE */
 507         saction.sa_handler = SIG_IGN;
 508         sigaction(SIGPIPE, &saction, NULL);
 509 #else
 510         signal(SIGINT, Signal_Handler);
 511         signal(SIGQUIT, Signal_Handler);
 512         signal(SIGTERM, Signal_Handler);
 513         signal(SIGHUP, Signal_Handler);
 514         signal(SIGCHLD, Signal_Handler);
 515
 516         signal(SIGPIPE, SIG_IGN);
 517 #endif
 518 } /* Initialize_Signal_Handler */
 519
 520
 521 /**
 522  * Signal handler of ngIRCd.
 523  * This function is called whenever ngIRCd catches a signal sent by the
 524  * user and/or the system to it. For example SIGTERM and SIGHUP.
 525  * @param Signal Number of the signal to handle.
 526  */
 527 static void
 528 Signal_Handler( int Signal )
 529 {
 530         switch( Signal )
 531         {
 532                 case SIGTERM:
 533                 case SIGINT:
 534                 case SIGQUIT:
 535                         /* shut down sever */
 536                         NGIRCd_SignalQuit = true;
 537                         break;
 538                 case SIGHUP:
 539                         /* re-read configuration */
 540                         NGIRCd_SignalRehash = true;
 541                         break;
 542                 case SIGCHLD:
 543                         /* child-process exited, avoid zombies */
 544                         while (waitpid( -1, NULL, WNOHANG) > 0)
 545                                 ;
 546                         break;
 547 #ifdef DEBUG
 548                 default:
 549                         /* unbekanntes bzw. unbehandeltes Signal */
 550                         Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal );
 551 #endif
 552         }
 553 } /* Signal_Handler */
 554
 555
 556 /**
 557  * Display copyright and version information of ngIRCd on the console.
 558  */
 559 static void
 560 Show_Version( void )
 561 {
 562         puts( NGIRCd_Version );
 563         puts( "Copyright (c)2001-2010 Alexander Barton (<alex@barton.de>) and Contributors." );
 564         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 565         puts( "This is free software; see the source for copying conditions. There is NO" );
 566         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 567 } /* Show_Version */
 568
 569
 570 /**
 571  * Display a short help text on the console.
 572  * This help depends on the configuration of the executable and only shows
 573  * options that are actually enabled.
 574  */
 575 static void
 576 Show_Help( void )
 577 {
 578 #ifdef DEBUG
 579         puts( "  -d, --debug        log extra debug messages" );
 580 #endif
 581         puts( "  -f, --config <f>   use file <f> as configuration file" );
 582         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 583         puts( "  -p, --passive      disable automatic connections to other servers" );
 584 #ifdef SNIFFER
 585         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 586 #endif
 587         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 588         puts( "  -V, --version      output version information and exit" );
 589         puts( "  -h, --help         display this help and exit" );
 590 } /* Show_Help */
 591
 592
 593 /**
 594  * Delete the file containing the process ID (PID).
 595  */
 596 static void
 597 Pidfile_Delete( void )
 598 {
 599         /* Pidfile configured? */
 600         if( ! Conf_PidFile[0] ) return;
 601
 602 #ifdef DEBUG
 603         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 604 #endif
 605
 606         if( unlink( Conf_PidFile ))
 607                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 608 } /* Pidfile_Delete */
 609
 610
 611 /**
 612  * Create the file containing the process ID of ngIRCd ("PID file").
 613  * @param pid The process ID to be stored in this file.
 614  */
 615 static void
 616 Pidfile_Create(pid_t pid)
 617 {
 618         int pidfd;
 619         char pidbuf[64];
 620         int len;
 621
 622         /* Pidfile configured? */
 623         if( ! Conf_PidFile[0] ) return;
 624
 625 #ifdef DEBUG
 626         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 627 #endif
 628
 629         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 630         if ( pidfd < 0 ) {
 631                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 632                 return;
 633         }
 634
 635         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 636         if (len < 0 || len >= (int)sizeof pidbuf) {
 637                 Log( LOG_ERR, "Error converting pid");
 638                 return;
 639         }
 640
 641         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 642                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 643
 644         if( close(pidfd) != 0 )
 645                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 646 } /* Pidfile_Create */
 647
 648
 649 /**
 650  * Redirect stdin, stdout and stderr to apropriate file handles.
 651  */
 652 static void
 653 Setup_FDStreams( void )
 654 {
 655         int fd;
 656
 657         /* Test if we can open /dev/null for reading and writing. If not
 658          * we are most probably chrooted already and the server has been
 659          * restarted. So we simply don't try to redirect stdXXX ... */
 660         fd = open( "/dev/null", O_RDWR );
 661         if ( fd < 0 ) {
 662                 Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
 663                 return;
 664         }
 665
 666         fflush(stdout);
 667         fflush(stderr);
 668
 669         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 670         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 671
 672         /* Close newly opened file descriptor if not stdin/out/err */
 673         if( fd > 2 ) close( fd );
 674 } /* Setup_FDStreams */
 675
 676
 677 static bool
 678 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 679 {
 680         struct passwd *pwd;
 681
 682 #ifdef __CYGWIN__
 683         /* Cygwin kludge.
 684          * It can return EINVAL instead of EPERM
 685          * so, if we are already unprivileged,
 686          * use id of current user.
 687          */
 688         if (geteuid() && getuid()) {
 689                 *uid = getuid();
 690                 *gid = getgid();
 691                 return true;
 692         }
 693 #endif
 694
 695         pwd = getpwnam("nobody");
 696         if (!pwd) return false;
 697
 698         if ( !pwd->pw_uid || !pwd->pw_gid)
 699                 return false;
 700
 701         *uid = pwd->pw_uid;
 702         *gid = pwd->pw_gid;
 703         endpwent();
 704
 705         return true;
 706 }
 707
 708
 709 static bool
 710 NGIRCd_Init( bool NGIRCd_NoDaemon )
 711 {
 712         static bool initialized;
 713         bool chrooted = false;
 714         struct passwd *pwd;
 715         struct group *grp;
 716         int real_errno;
 717         pid_t pid;
 718
 719         if (initialized)
 720                 return true;
 721
 722         if (!ConnSSL_InitLibrary())
 723                 Log(LOG_WARNING,
 724                     "Warning: Error during SSL initialization, continuing ...");
 725
 726         if( Conf_Chroot[0] ) {
 727                 if( chdir( Conf_Chroot ) != 0 ) {
 728                         Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
 729                         return false;
 730                 }
 731
 732                 if( chroot( Conf_Chroot ) != 0 ) {
 733                         if (errno != EPERM) {
 734                                 Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
 735                                                                 Conf_Chroot, strerror( errno ));
 736
 737                                 return false;
 738                         }
 739                 } else {
 740                         chrooted = true;
 741                         Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
 742                 }
 743         }
 744
 745         if (Conf_UID == 0) {
 746                 Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
 747
 748                 if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 749                         Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
 750                                         errno ? strerror(errno) : "not found" );
 751                         return false;
 752                 }
 753         }
 754
 755         if (getgid() != Conf_GID) {
 756                 /* Change group ID */
 757                 if (setgid(Conf_GID) != 0) {
 758                         real_errno = errno;
 759                         Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
 760                         if (real_errno != EPERM)
 761                                 return false;
 762                 }
 763         }
 764
 765         if (getuid() != Conf_UID) {
 766                 /* Change user ID */
 767                 if (setuid(Conf_UID) != 0) {
 768                         real_errno = errno;
 769                         Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
 770                         if (real_errno != EPERM)
 771                                 return false;
 772                 }
 773         }
 774
 775         initialized = true;
 776
 777         /* Normally a child process is forked which isn't any longer
 778          * connected to ther controlling terminal. Use "--nodaemon"
 779          * to disable this "daemon mode" (useful for debugging). */
 780         if ( ! NGIRCd_NoDaemon ) {
 781                 pid = fork( );
 782                 if( pid > 0 ) {
 783                         /* "Old" process: exit. */
 784                         exit( 0 );
 785                 }
 786                 if( pid < 0 ) {
 787                         /* Error!? */
 788                         fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 789                                                                 PACKAGE_NAME, strerror( errno ));
 790                         exit( 1 );
 791                 }
 792
 793                 /* New child process */
 794 #ifndef NeXT
 795                 (void)setsid( );
 796 #else
 797                 setpgrp(0, getpid());
 798 #endif
 799                 if (chdir( "/" ) != 0)
 800                         Log(LOG_ERR, "Can't change directory to '/': %s",
 801                                      strerror(errno));
 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- */