src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   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 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * The main program, including the C function main() which is called
  17  * by the loader of the operating system.
  18  */
  19
  20 #include "imp.h"
  21 #include <assert.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34
  35 #if defined(DEBUG) && defined(HAVE_MTRACE)
  36 #include <mcheck.h>
  37 #endif
  38
  39 #include "defines.h"
  40 #include "conn.h"
  41 #include "class.h"
  42 #include "conf-ssl.h"
  43 #include "channel.h"
  44 #include "conf.h"
  45 #include "lists.h"
  46 #include "log.h"
  47 #include "parse.h"
  48 #include "sighandlers.h"
  49 #include "io.h"
  50 #include "irc.h"
  51
  52 #include "exp.h"
  53 #include "ngircd.h"
  54
  55
  56 static void Show_Version PARAMS(( void ));
  57 static void Show_Help PARAMS(( void ));
  58
  59 static void Pidfile_Create PARAMS(( pid_t pid ));
  60 static void Pidfile_Delete PARAMS(( void ));
  61
  62 static void Fill_Version PARAMS(( void ));
  63
  64 static void Random_Init PARAMS(( void ));
  65
  66 static void Setup_FDStreams PARAMS(( int fd ));
  67
  68 static bool NGIRCd_Init PARAMS(( bool ));
  69
  70
  71 /**
  72  * The main() function of ngIRCd.
  73  *
  74  * Here all starts: this function is called by the operating system loader,
  75  * it is the first portion of code executed of ngIRCd.
  76  *
  77  * @param argc The number of arguments passed to ngIRCd on the command line.
  78  * @param argv An array containing all the arguments passed to ngIRCd.
  79  * @return Global exit code of ngIRCd, zero on success.
  80  */
  81 GLOBAL int
  82 main(int argc, const char *argv[])
  83 {
  84         bool ok, configtest = false;
  85         bool NGIRCd_NoDaemon = false;
  86         int i;
  87         size_t n;
  88
  89 #if defined(DEBUG) && defined(HAVE_MTRACE)
  90         /* enable GNU libc memory tracing when running in debug mode
  91          * and functionality available */
  92         mtrace();
  93 #endif
  94
  95         umask(0077);
  96
  97         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  98         NGIRCd_Passive = false;
  99 #ifdef DEBUG
 100         NGIRCd_Debug = false;
 101 #endif
 102 #ifdef SNIFFER
 103         NGIRCd_Sniffer = false;
 104 #endif
 105         strlcpy(NGIRCd_ConfFile, SYSCONFDIR, sizeof(NGIRCd_ConfFile));
 106         strlcat(NGIRCd_ConfFile, CONFIG_FILE, sizeof(NGIRCd_ConfFile));
 107
 108         Fill_Version();
 109
 110         /* parse conmmand line */
 111         for (i = 1; i < argc; i++) {
 112                 ok = false;
 113                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 114                         /* long option */
 115                         if (strcmp(argv[i], "--config") == 0) {
 116                                 if (i + 1 < argc) {
 117                                         /* Ok, there's an parameter left */
 118                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 119                                                 sizeof(NGIRCd_ConfFile));
 120                                         /* next parameter */
 121                                         i++; ok = true;
 122                                 }
 123                         }
 124                         if (strcmp(argv[i], "--configtest") == 0) {
 125                                 configtest = true;
 126                                 ok = true;
 127                         }
 128 #ifdef DEBUG
 129                         if (strcmp(argv[i], "--debug") == 0) {
 130                                 NGIRCd_Debug = true;
 131                                 ok = true;
 132                         }
 133 #endif
 134                         if (strcmp(argv[i], "--help") == 0) {
 135                                 Show_Version();
 136                                 puts(""); Show_Help( ); puts( "" );
 137                                 exit(1);
 138                         }
 139                         if (strcmp(argv[i], "--nodaemon") == 0) {
 140                                 NGIRCd_NoDaemon = true;
 141                                 ok = true;
 142                         }
 143                         if (strcmp(argv[i], "--passive") == 0) {
 144                                 NGIRCd_Passive = true;
 145                                 ok = true;
 146                         }
 147 #ifdef SNIFFER
 148                         if (strcmp(argv[i], "--sniffer") == 0) {
 149                                 NGIRCd_Sniffer = true;
 150                                 ok = true;
 151                         }
 152 #endif
 153                         if (strcmp(argv[i], "--version") == 0) {
 154                                 Show_Version();
 155                                 exit(1);
 156                         }
 157                 }
 158                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 159                         /* short option */
 160                         for (n = 1; n < strlen(argv[i]); n++) {
 161                                 ok = false;
 162 #ifdef DEBUG
 163                                 if (argv[i][n] == 'd') {
 164                                         NGIRCd_Debug = true;
 165                                         ok = true;
 166                                 }
 167 #endif
 168                                 if (argv[i][n] == 'f') {
 169                                         if (!argv[i][n+1] && i+1 < argc) {
 170                                                 /* Ok, next character is a blank */
 171                                                 strlcpy(NGIRCd_ConfFile, argv[i+1],
 172                                                         sizeof(NGIRCd_ConfFile));
 173
 174                                                 /* go to the following parameter */
 175                                                 i++;
 176                                                 n = strlen(argv[i]);
 177                                                 ok = true;
 178                                         }
 179                                 }
 180
 181                                 if (argv[i][n] == 'h') {
 182                                         Show_Version();
 183                                         puts(""); Show_Help(); puts("");
 184                                         exit(1);
 185                                 }
 186
 187                                 if (argv[i][n] == 'n') {
 188                                         NGIRCd_NoDaemon = true;
 189                                         ok = true;
 190                                 }
 191                                 if (argv[i][n] == 'p') {
 192                                         NGIRCd_Passive = true;
 193                                         ok = true;
 194                                 }
 195 #ifdef SNIFFER
 196                                 if (argv[i][n] == 's') {
 197                                         NGIRCd_Sniffer = true;
 198                                         ok = true;
 199                                 }
 200 #endif
 201                                 if (argv[i][n] == 't') {
 202                                         configtest = true;
 203                                         ok = true;
 204                                 }
 205
 206                                 if (argv[i][n] == 'V') {
 207                                         Show_Version();
 208                                         exit(1);
 209                                 }
 210
 211                                 if (!ok) {
 212                                         printf("%s: invalid option \"-%c\"!\n",
 213                                                PACKAGE_NAME, argv[i][n]);
 214                                         printf("Try \"%s --help\" for more information.\n",
 215                                                PACKAGE_NAME);
 216                                         exit(1);
 217                                 }
 218                         }
 219
 220                 }
 221                 if (!ok) {
 222                         printf("%s: invalid option \"%s\"!\n",
 223                                PACKAGE_NAME, argv[i]);
 224                         printf("Try \"%s --help\" for more information.\n",
 225                                PACKAGE_NAME);
 226                         exit(1);
 227                 }
 228         }
 229
 230         /* Debug level for "VERSION" command */
 231         NGIRCd_DebugLevel[0] = '\0';
 232 #ifdef DEBUG
 233         if (NGIRCd_Debug)
 234                 strcpy(NGIRCd_DebugLevel, "1");
 235 #endif
 236 #ifdef SNIFFER
 237         if (NGIRCd_Sniffer) {
 238                 NGIRCd_Debug = true;
 239                 strcpy(NGIRCd_DebugLevel, "2");
 240         }
 241 #endif
 242
 243         if (configtest) {
 244                 Show_Version(); puts("");
 245                 exit(Conf_Test());
 246         }
 247
 248         while (!NGIRCd_SignalQuit) {
 249                 /* Initialize global variables */
 250                 NGIRCd_Start = time(NULL);
 251                 (void)strftime(NGIRCd_StartStr, 64,
 252                                "%a %b %d %Y at %H:%M:%S (%Z)",
 253                                localtime(&NGIRCd_Start));
 254
 255                 NGIRCd_SignalRestart = false;
 256                 NGIRCd_SignalQuit = false;
 257
 258                 /* Initialize modules, part I */
 259                 Log_Init(!NGIRCd_NoDaemon);
 260                 Random_Init();
 261                 Conf_Init();
 262                 Log_ReInit();
 263
 264                 /* Initialize the "main program": chroot environment, user and
 265                  * group ID, ... */
 266                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 267                         Log(LOG_ALERT, "Fatal: Initialization failed");
 268                         exit(1);
 269                 }
 270
 271                 /* Initialize modules, part II: these functions are eventually
 272                  * called with already dropped privileges ... */
 273                 Channel_Init();
 274                 Client_Init();
 275                 Conn_Init();
 276                 Class_Init();
 277
 278                 if (!io_library_init(CONNECTION_POOL)) {
 279                         Log(LOG_ALERT,
 280                             "Fatal: Could not initialize IO routines: %s",
 281                             strerror(errno));
 282                         exit(1);
 283                 }
 284
 285                 if (!Signals_Init()) {
 286                         Log(LOG_ALERT,
 287                             "Fatal: Could not set up signal handlers: %s",
 288                             strerror(errno));
 289                         exit(1);
 290                 }
 291
 292                 /* Create protocol and server identification. The syntax
 293                  * used by ngIRCd in PASS commands and the known "extended
 294                  * flags" are described in doc/Protocol.txt. */
 295 #ifdef IRCPLUS
 296                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 297                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 298                          IRCPLUSFLAGS);
 299 #ifdef ZLIB
 300                 strcat(NGIRCd_ProtoID, "Z");
 301 #endif
 302                 if (Conf_OperCanMode)
 303                         strcat(NGIRCd_ProtoID, "o");
 304 #else /* IRCPLUS */
 305                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 306                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 307 #endif /* IRCPLUS */
 308                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 309 #ifdef ZLIB
 310                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 311 #endif
 312                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 313
 314                 Channel_InitPredefined();
 315
 316                 if (Conn_InitListeners() < 1) {
 317                         Log(LOG_ALERT,
 318                             "Server isn't listening on a single port!" );
 319                         Log(LOG_ALERT,
 320                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 321                         Pidfile_Delete();
 322                         exit(1);
 323                 }
 324
 325                 /* Main Run Loop */
 326                 Conn_Handler();
 327
 328                 Conn_Exit();
 329                 Client_Exit();
 330                 Channel_Exit();
 331                 Class_Exit();
 332                 Log_Exit();
 333                 Signals_Exit();
 334         }
 335         Pidfile_Delete();
 336
 337         return 0;
 338 } /* main */
 339
 340
 341 /**
 342  * Generate ngIRCd "version strings".
 343  *
 344  * The ngIRCd version information is generated once and then stored in the
 345  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 346  * usage, for example by the IRC command "VERSION" and the --version command
 347  * line switch.
 348  */
 349 static void
 350 Fill_Version( void )
 351 {
 352         NGIRCd_VersionAddition[0] = '\0';
 353
 354 #ifdef SYSLOG
 355         strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 356 #endif
 357 #ifdef ZLIB
 358         if( NGIRCd_VersionAddition[0] )
 359                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 360         strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 361 #endif
 362 #ifdef SSL_SUPPORT
 363         if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 364         strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
 365 #endif
 366 #ifdef TCPWRAP
 367         if( NGIRCd_VersionAddition[0] )
 368                         strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 369         strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 370 #endif
 371 #ifdef IDENTAUTH
 372         if( NGIRCd_VersionAddition[0] )
 373                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 374         strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 375 #endif
 376 #ifdef PAM
 377         if (NGIRCd_VersionAddition[0])
 378                 strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
 379         strlcat(NGIRCd_VersionAddition, "PAM", sizeof NGIRCd_VersionAddition);
 380 #endif
 381 #ifdef DEBUG
 382         if( NGIRCd_VersionAddition[0] )
 383                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 384         strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 385 #endif
 386 #ifdef SNIFFER
 387         if( NGIRCd_VersionAddition[0] )
 388                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 389         strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 390 #endif
 391 #ifdef STRICT_RFC
 392         if( NGIRCd_VersionAddition[0] )
 393                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 394         strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 395 #endif
 396 #ifdef IRCPLUS
 397         if( NGIRCd_VersionAddition[0] )
 398                 strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
 399         strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 400 #endif
 401 #ifdef WANT_IPV6
 402         if (NGIRCd_VersionAddition[0])
 403                 strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
 404         strlcat(NGIRCd_VersionAddition, "IPv6", sizeof(NGIRCd_VersionAddition));
 405 #endif
 406         if( NGIRCd_VersionAddition[0] )
 407                 strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
 408
 409         strlcat( NGIRCd_VersionAddition, HOST_CPU, sizeof( NGIRCd_VersionAddition ));
 410         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 411         strlcat( NGIRCd_VersionAddition, HOST_VENDOR, sizeof( NGIRCd_VersionAddition ));
 412         strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 413         strlcat( NGIRCd_VersionAddition, HOST_OS, sizeof( NGIRCd_VersionAddition ));
 414
 415         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 416                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 417 } /* Fill_Version */
 418
 419
 420 /**
 421  * Display copyright and version information of ngIRCd on the console.
 422  */
 423 static void
 424 Show_Version( void )
 425 {
 426         puts( NGIRCd_Version );
 427         puts( "Copyright (c)2001-2012 Alexander Barton (<alex@barton.de>) and Contributors." );
 428         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 429         puts( "This is free software; see the source for copying conditions. There is NO" );
 430         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 431 } /* Show_Version */
 432
 433
 434 /**
 435  * Display a short help text on the console.
 436  * This help depends on the configuration of the executable and only shows
 437  * options that are actually enabled.
 438  */
 439 static void
 440 Show_Help( void )
 441 {
 442 #ifdef DEBUG
 443         puts( "  -d, --debug        log extra debug messages" );
 444 #endif
 445         puts( "  -f, --config <f>   use file <f> as configuration file" );
 446         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 447         puts( "  -p, --passive      disable automatic connections to other servers" );
 448 #ifdef SNIFFER
 449         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 450 #endif
 451         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 452         puts( "  -V, --version      output version information and exit" );
 453         puts( "  -h, --help         display this help and exit" );
 454 } /* Show_Help */
 455
 456
 457 /**
 458  * Delete the file containing the process ID (PID).
 459  */
 460 static void
 461 Pidfile_Delete( void )
 462 {
 463         /* Pidfile configured? */
 464         if( ! Conf_PidFile[0] ) return;
 465
 466 #ifdef DEBUG
 467         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 468 #endif
 469
 470         if( unlink( Conf_PidFile ))
 471                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 472 } /* Pidfile_Delete */
 473
 474
 475 /**
 476  * Create the file containing the process ID of ngIRCd ("PID file").
 477  *
 478  * @param pid   The process ID to be stored in this file.
 479  */
 480 static void
 481 Pidfile_Create(pid_t pid)
 482 {
 483         int pidfd;
 484         char pidbuf[64];
 485         int len;
 486
 487         /* Pidfile configured? */
 488         if( ! Conf_PidFile[0] ) return;
 489
 490 #ifdef DEBUG
 491         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 492 #endif
 493
 494         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 495         if ( pidfd < 0 ) {
 496                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 497                 return;
 498         }
 499
 500         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 501         if (len < 0 || len >= (int)sizeof pidbuf) {
 502                 Log(LOG_ERR, "Error converting pid");
 503                 close(pidfd);
 504                 return;
 505         }
 506
 507         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 508                 Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 509
 510         if( close(pidfd) != 0 )
 511                 Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 512 } /* Pidfile_Create */
 513
 514
 515 /**
 516  * Redirect stdin, stdout and stderr to apropriate file handles.
 517  *
 518  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 519  */
 520 static void
 521 Setup_FDStreams(int fd)
 522 {
 523         if (fd < 0)
 524                 return;
 525
 526         fflush(stdout);
 527         fflush(stderr);
 528
 529         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 530         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 531 } /* Setup_FDStreams */
 532
 533
 534 /**
 535  * Get user and group ID of unprivileged "nobody" user.
 536  *
 537  * @param uid   User ID
 538  * @param gid   Group ID
 539  * @return      true on success.
 540  */
 541 static bool
 542 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 543 {
 544         struct passwd *pwd;
 545
 546 #ifdef __CYGWIN__
 547         /* Cygwin kludge.
 548          * It can return EINVAL instead of EPERM
 549          * so, if we are already unprivileged,
 550          * use id of current user.
 551          */
 552         if (geteuid() && getuid()) {
 553                 *uid = getuid();
 554                 *gid = getgid();
 555                 return true;
 556         }
 557 #endif
 558
 559         pwd = getpwnam("nobody");
 560         if (!pwd)
 561                 return false;
 562
 563         if (!pwd->pw_uid || !pwd->pw_gid)
 564                 return false;
 565
 566         *uid = pwd->pw_uid;
 567         *gid = pwd->pw_gid;
 568         endpwent();
 569
 570         return true;
 571 } /* NGIRCd_getNobodyID */
 572
 573
 574 static bool
 575 Random_Init_Kern(const char *file)
 576 {
 577         unsigned int seed;
 578         bool ret = false;
 579         int fd = open(file, O_RDONLY);
 580         if (fd >= 0) {
 581                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 582                         ret = true;
 583                 close(fd);
 584                 srand(seed);
 585         }
 586         return ret;
 587 }
 588
 589 /**
 590  * Initialize libc rand(3) number generator
 591  */
 592 static void
 593 Random_Init(void)
 594 {
 595         if (Random_Init_Kern("/dev/urandom"))
 596                 return;
 597         if (Random_Init_Kern("/dev/random"))
 598                 return;
 599         if (Random_Init_Kern("/dev/arandom"))
 600                 return;
 601         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 602 }
 603
 604
 605 /**
 606  * Initialize ngIRCd daemon.
 607  *
 608  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 609  *              foreground (and not as a daemon).
 610  * @return true on success.
 611  */
 612 static bool
 613 NGIRCd_Init(bool NGIRCd_NoDaemon)
 614 {
 615         static bool initialized;
 616         bool chrooted = false;
 617         struct passwd *pwd;
 618         struct group *grp;
 619         int real_errno, fd = -1;
 620         pid_t pid;
 621
 622         if (initialized)
 623                 return true;
 624
 625         if (!NGIRCd_NoDaemon) {
 626                 /* open /dev/null before chroot() */
 627                 fd = open( "/dev/null", O_RDWR);
 628                 if (fd < 0)
 629                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 630                             strerror(errno));
 631         }
 632
 633         /* SSL initialization */
 634         if (!ConnSSL_InitLibrary())
 635                 Log(LOG_WARNING,
 636                     "Warning: Error during SSL initialization, continuing ...");
 637
 638         /* Change root */
 639         if (Conf_Chroot[0]) {
 640                 if (chdir(Conf_Chroot) != 0) {
 641                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s",
 642                             Conf_Chroot, strerror(errno));
 643                         goto out;
 644                 }
 645
 646                 if (chroot(Conf_Chroot) != 0) {
 647                         Log(LOG_ERR,
 648                             "Can't change root directory to \"%s\": %s",
 649                             Conf_Chroot, strerror(errno));
 650                         goto out;
 651                 } else {
 652                         chrooted = true;
 653                         Log(LOG_INFO,
 654                             "Changed root and working directory to \"%s\".",
 655                             Conf_Chroot);
 656                 }
 657         }
 658
 659         /* Check user ID */
 660         if (Conf_UID == 0) {
 661                 pwd = getpwuid(0);
 662                 Log(LOG_INFO,
 663                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 664                     pwd ? pwd->pw_name : "?");
 665                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 666                         Log(LOG_WARNING,
 667                             "Could not get user/group ID of user \"nobody\": %s",
 668                             errno ? strerror(errno) : "not found" );
 669                         goto out;
 670                 }
 671         }
 672
 673         /* Change group ID */
 674         if (getgid() != Conf_GID) {
 675                 if (setgid(Conf_GID) != 0) {
 676                         real_errno = errno;
 677                         grp = getgrgid(Conf_GID);
 678                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s",
 679                             grp ? grp->gr_name : "?", Conf_GID,
 680                             strerror(errno));
 681                         if (real_errno != EPERM)
 682                                 goto out;
 683                 }
 684         }
 685
 686         /* Change user ID */
 687         if (getuid() != Conf_UID) {
 688                 if (setuid(Conf_UID) != 0) {
 689                         real_errno = errno;
 690                         pwd = getpwuid(Conf_UID);
 691                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s",
 692                             pwd ? pwd->pw_name : "?", Conf_UID,
 693                             strerror(errno));
 694                         if (real_errno != EPERM)
 695                                 goto out;
 696                 }
 697         }
 698
 699         initialized = true;
 700
 701         /* Normally a child process is forked which isn't any longer
 702          * connected to ther controlling terminal. Use "--nodaemon"
 703          * to disable this "daemon mode" (useful for debugging). */
 704         if (!NGIRCd_NoDaemon) {
 705                 pid = fork();
 706                 if (pid > 0) {
 707                         /* "Old" process: exit. */
 708                         exit(0);
 709                 }
 710                 if (pid < 0) {
 711                         /* Error!? */
 712                         fprintf(stderr,
 713                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 714                                 PACKAGE_NAME, strerror(errno));
 715                         exit(1);
 716                 }
 717
 718                 /* New child process */
 719 #ifdef HAVE_SETSID
 720                 (void)setsid();
 721 #else
 722                 setpgrp(0, getpid());
 723 #endif
 724                 if (chdir("/") != 0)
 725                         Log(LOG_ERR, "Can't change directory to '/': %s",
 726                                      strerror(errno));
 727
 728                 /* Detach stdin, stdout and stderr */
 729                 Setup_FDStreams(fd);
 730                 if (fd > 2)
 731                         close(fd);
 732         }
 733         pid = getpid();
 734
 735         Pidfile_Create(pid);
 736
 737         /* Check UID/GID we are running as, can be different from values
 738          * configured (e. g. if we were already started with a UID>0. */
 739         Conf_UID = getuid();
 740         Conf_GID = getgid();
 741
 742         pwd = getpwuid(Conf_UID);
 743         grp = getgrgid(Conf_GID);
 744
 745         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 746             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 747             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 748
 749         if (chrooted) {
 750                 Log(LOG_INFO, "Running with root directory \"%s\".",
 751                     Conf_Chroot );
 752                 return true;
 753         } else
 754                 Log(LOG_INFO, "Not running with changed root directory.");
 755
 756         /* Change working directory to home directory of the user we are
 757          * running as (only when running in daemon mode and not in chroot) */
 758
 759         if (NGIRCd_NoDaemon)
 760                 return true;
 761
 762         if (pwd) {
 763                 if (chdir(pwd->pw_dir) == 0)
 764                         Log(LOG_DEBUG,
 765                             "Changed working directory to \"%s\" ...",
 766                             pwd->pw_dir);
 767                 else
 768                         Log(LOG_INFO,
 769                             "Notice: Can't change working directory to \"%s\": %s",
 770                             pwd->pw_dir, strerror(errno));
 771         } else
 772                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 773
 774         return true;
 775  out:
 776         if (fd > 2)
 777                 close(fd);
 778         return false;
 779 } /* NGIRCd_Init */
 780
 781
 782 /* -eof- */