src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2023 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 #define GLOBAL_INIT
  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 <assert.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <time.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <pwd.h>
  32 #include <grp.h>
  33
  34 #if defined(DEBUG) && defined(HAVE_MTRACE)
  35 #include <mcheck.h>
  36 #endif
  37
  38 #include "conn.h"
  39 #include "class.h"
  40 #include "channel.h"
  41 #include "conf.h"
  42 #include "log.h"
  43 #include "sighandlers.h"
  44 #include "io.h"
  45
  46 #include "ngircd.h"
  47
  48 static void Show_Version PARAMS(( void ));
  49 static void Show_Help PARAMS(( void ));
  50
  51 static void Pidfile_Create PARAMS(( pid_t pid ));
  52 static void Pidfile_Delete PARAMS(( void ));
  53
  54 static void Fill_Version PARAMS(( void ));
  55
  56 static void Random_Init PARAMS(( void ));
  57
  58 static void Setup_FDStreams PARAMS(( int fd ));
  59
  60 static bool NGIRCd_Init PARAMS(( bool ));
  61
  62
  63 /**
  64  * The main() function of ngIRCd.
  65  *
  66  * Here all starts: this function is called by the operating system loader,
  67  * it is the first portion of code executed of ngIRCd.
  68  *
  69  * @param argc The number of arguments passed to ngIRCd on the command line.
  70  * @param argv An array containing all the arguments passed to ngIRCd.
  71  * @return Global exit code of ngIRCd, zero on success.
  72  */
  73 GLOBAL int
  74 main(int argc, const char *argv[])
  75 {
  76         bool ok, configtest = false;
  77         bool NGIRCd_NoDaemon = false;
  78         int i;
  79         size_t n;
  80
  81 #if defined(DEBUG) && defined(HAVE_MTRACE)
  82         /* enable GNU libc memory tracing when running in debug mode
  83          * and functionality available */
  84         mtrace();
  85 #endif
  86
  87         umask(0077);
  88
  89         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  90         NGIRCd_Passive = false;
  91         NGIRCd_Debug = false;
  92 #ifdef SNIFFER
  93         NGIRCd_Sniffer = false;
  94 #endif
  95         strlcpy(NGIRCd_ConfFile, SYSCONFDIR, sizeof(NGIRCd_ConfFile));
  96         strlcat(NGIRCd_ConfFile, CONFIG_FILE, sizeof(NGIRCd_ConfFile));
  97
  98         Fill_Version();
  99
 100         /* parse conmmand line */
 101         for (i = 1; i < argc; i++) {
 102                 ok = false;
 103                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 104                         /* long option */
 105                         if (strcmp(argv[i], "--config") == 0) {
 106                                 if (i + 1 < argc) {
 107                                         /* Ok, there's an parameter left */
 108                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 109                                                 sizeof(NGIRCd_ConfFile));
 110                                         /* next parameter */
 111                                         i++; ok = true;
 112                                 }
 113                         }
 114                         if (strcmp(argv[i], "--configtest") == 0) {
 115                                 configtest = true;
 116                                 ok = true;
 117                         }
 118                         if (strcmp(argv[i], "--debug") == 0) {
 119                                 NGIRCd_Debug = true;
 120                                 ok = true;
 121                         }
 122                         if (strcmp(argv[i], "--help") == 0) {
 123                                 Show_Version();
 124                                 puts(""); Show_Help( ); puts( "" );
 125                                 exit(0);
 126                         }
 127                         if (strcmp(argv[i], "--nodaemon") == 0) {
 128                                 NGIRCd_NoDaemon = true;
 129                                 ok = true;
 130                         }
 131                         if (strcmp(argv[i], "--passive") == 0) {
 132                                 NGIRCd_Passive = true;
 133                                 ok = true;
 134                         }
 135 #ifdef SNIFFER
 136                         if (strcmp(argv[i], "--sniffer") == 0) {
 137                                 NGIRCd_Sniffer = true;
 138                                 ok = true;
 139                         }
 140 #endif
 141                         if (strcmp(argv[i], "--version") == 0) {
 142                                 Show_Version();
 143                                 exit(0);
 144                         }
 145                 }
 146                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 147                         /* short option */
 148                         for (n = 1; n < strlen(argv[i]); n++) {
 149                                 ok = false;
 150                                 if (argv[i][n] == 'd') {
 151                                         NGIRCd_Debug = true;
 152                                         ok = true;
 153                                 }
 154                                 if (argv[i][n] == 'f') {
 155                                         if (!argv[i][n+1] && i+1 < argc) {
 156                                                 /* Ok, next character is a blank */
 157                                                 strlcpy(NGIRCd_ConfFile, argv[i+1],
 158                                                         sizeof(NGIRCd_ConfFile));
 159
 160                                                 /* go to the following parameter */
 161                                                 i++;
 162                                                 n = strlen(argv[i]);
 163                                                 ok = true;
 164                                         }
 165                                 }
 166
 167                                 if (argv[i][n] == 'h') {
 168                                         Show_Version();
 169                                         puts(""); Show_Help(); puts("");
 170                                         exit(1);
 171                                 }
 172
 173                                 if (argv[i][n] == 'n') {
 174                                         NGIRCd_NoDaemon = true;
 175                                         ok = true;
 176                                 }
 177                                 if (argv[i][n] == 'p') {
 178                                         NGIRCd_Passive = true;
 179                                         ok = true;
 180                                 }
 181 #ifdef SNIFFER
 182                                 if (argv[i][n] == 's') {
 183                                         NGIRCd_Sniffer = true;
 184                                         ok = true;
 185                                 }
 186 #endif
 187                                 if (argv[i][n] == 't') {
 188                                         configtest = true;
 189                                         ok = true;
 190                                 }
 191
 192                                 if (argv[i][n] == 'V') {
 193                                         Show_Version();
 194                                         exit(1);
 195                                 }
 196
 197                                 if (!ok) {
 198                                         fprintf(stderr,
 199                                                 "%s: invalid option \"-%c\"!\n",
 200                                                 PACKAGE_NAME, argv[i][n]);
 201                                         fprintf(stderr,
 202                                                 "Try \"%s --help\" for more information.\n",
 203                                                 PACKAGE_NAME);
 204                                         exit(2);
 205                                 }
 206                         }
 207
 208                 }
 209                 if (!ok) {
 210                         fprintf(stderr, "%s: invalid option \"%s\"!\n",
 211                                 PACKAGE_NAME, argv[i]);
 212                         fprintf(stderr, "Try \"%s --help\" for more information.\n",
 213                                 PACKAGE_NAME);
 214                         exit(2);
 215                 }
 216         }
 217
 218         /* Debug level for "VERSION" command */
 219         NGIRCd_DebugLevel[0] = '\0';
 220         if (NGIRCd_Debug)
 221                 strcpy(NGIRCd_DebugLevel, "1");
 222 #ifdef SNIFFER
 223         if (NGIRCd_Sniffer) {
 224                 NGIRCd_Debug = true;
 225                 strcpy(NGIRCd_DebugLevel, "2");
 226         }
 227 #endif
 228
 229         if (configtest) {
 230                 Show_Version(); puts("");
 231                 exit(Conf_Test());
 232         }
 233
 234         while (!NGIRCd_SignalQuit) {
 235                 /* Initialize global variables */
 236                 NGIRCd_Start = time(NULL);
 237                 (void)strftime(NGIRCd_StartStr, 64,
 238                                "%a %b %d %Y at %H:%M:%S (%Z)",
 239                                localtime(&NGIRCd_Start));
 240
 241                 NGIRCd_SignalRestart = false;
 242                 NGIRCd_SignalQuit = false;
 243
 244                 Log_Init(!NGIRCd_NoDaemon);
 245                 Random_Init();
 246                 Conf_Init();
 247                 Log_ReInit();
 248
 249                 /* Initialize the "main program":
 250                  * chroot environment, user and group ID, ... */
 251                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 252                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 253                         exit(1);
 254                 }
 255
 256                 if (!io_library_init(CONNECTION_POOL)) {
 257                         Log(LOG_ALERT,
 258                             "Fatal: Could not initialize IO routines: %s",
 259                             strerror(errno));
 260                         exit(1);
 261                 }
 262
 263                 if (!Signals_Init()) {
 264                         Log(LOG_ALERT,
 265                             "Fatal: Could not set up signal handlers: %s",
 266                             strerror(errno));
 267                         exit(1);
 268                 }
 269
 270                 Channel_Init();
 271                 Conn_Init();
 272                 Class_Init();
 273                 Client_Init();
 274
 275                 /* Create protocol and server identification. The syntax
 276                  * used by ngIRCd in PASS commands and the known "extended
 277                  * flags" are described in doc/Protocol.txt. */
 278 #ifdef IRCPLUS
 279                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 280                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 281                          IRCPLUSFLAGS);
 282 #ifdef ZLIB
 283                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 284 #endif
 285                 if (Conf_OperCanMode)
 286                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 287 #else /* IRCPLUS */
 288                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 289                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 290 #endif /* IRCPLUS */
 291                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 292 #ifdef ZLIB
 293                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 294 #endif
 295                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 296
 297                 Channel_InitPredefined();
 298
 299                 if (Conn_InitListeners() < 1) {
 300                         Log(LOG_ALERT,
 301                             "Server isn't listening on a single port!" );
 302                         Log(LOG_ALERT,
 303                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 304                         Pidfile_Delete();
 305                         exit(1);
 306                 }
 307
 308                 /* Main Run Loop */
 309                 Conn_Handler();
 310
 311                 Conn_Exit();
 312                 Client_Exit();
 313                 Channel_Exit();
 314                 Class_Exit();
 315                 Log_Exit();
 316                 Signals_Exit();
 317         }
 318         Pidfile_Delete();
 319
 320         return 0;
 321 } /* main */
 322
 323
 324 /**
 325  * Generate ngIRCd "version strings".
 326  *
 327  * The ngIRCd version information is generated once and then stored in the
 328  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 329  * usage, for example by the IRC command "VERSION" and the --version command
 330  * line switch.
 331  */
 332 static void
 333 Fill_Version(void)
 334 {
 335         NGIRCd_VersionAddition[0] = '\0';
 336
 337 #ifdef ICONV
 338         if (NGIRCd_VersionAddition[0])
 339                 strlcat(NGIRCd_VersionAddition, "+",
 340                         sizeof NGIRCd_VersionAddition);
 341         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 342                 sizeof NGIRCd_VersionAddition);
 343 #endif
 344 #ifdef DEBUG
 345         if (NGIRCd_VersionAddition[0])
 346                 strlcat(NGIRCd_VersionAddition, "+",
 347                         sizeof NGIRCd_VersionAddition);
 348         strlcat(NGIRCd_VersionAddition, "DEBUG",
 349                 sizeof NGIRCd_VersionAddition);
 350 #endif
 351 #ifdef IDENTAUTH
 352         if (NGIRCd_VersionAddition[0])
 353                 strlcat(NGIRCd_VersionAddition, "+",
 354                         sizeof NGIRCd_VersionAddition);
 355         strlcat(NGIRCd_VersionAddition, "IDENT",
 356                 sizeof NGIRCd_VersionAddition);
 357 #endif
 358 #ifdef WANT_IPV6
 359         if (NGIRCd_VersionAddition[0])
 360                 strlcat(NGIRCd_VersionAddition, "+",
 361                         sizeof(NGIRCd_VersionAddition));
 362         strlcat(NGIRCd_VersionAddition, "IPv6",
 363                 sizeof(NGIRCd_VersionAddition));
 364 #endif
 365 #ifdef IRCPLUS
 366         if (NGIRCd_VersionAddition[0])
 367                 strlcat(NGIRCd_VersionAddition, "+",
 368                         sizeof NGIRCd_VersionAddition);
 369         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 370                 sizeof NGIRCd_VersionAddition);
 371 #endif
 372 #ifdef PAM
 373         if (NGIRCd_VersionAddition[0])
 374                 strlcat(NGIRCd_VersionAddition, "+",
 375                         sizeof NGIRCd_VersionAddition);
 376         strlcat(NGIRCd_VersionAddition, "PAM",
 377                 sizeof NGIRCd_VersionAddition);
 378 #endif
 379 #ifdef STRICT_RFC
 380         if (NGIRCd_VersionAddition[0])
 381                 strlcat(NGIRCd_VersionAddition, "+",
 382                         sizeof NGIRCd_VersionAddition);
 383         strlcat(NGIRCd_VersionAddition, "RFC",
 384                 sizeof NGIRCd_VersionAddition);
 385 #endif
 386 #ifdef SNIFFER
 387         if (NGIRCd_VersionAddition[0])
 388                 strlcat(NGIRCd_VersionAddition, "+",
 389                         sizeof NGIRCd_VersionAddition);
 390         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 391                 sizeof NGIRCd_VersionAddition);
 392 #endif
 393 #ifdef SSL_SUPPORT
 394         if (NGIRCd_VersionAddition[0])
 395                 strlcat(NGIRCd_VersionAddition, "+",
 396                         sizeof NGIRCd_VersionAddition);
 397         strlcat(NGIRCd_VersionAddition, "SSL",
 398                 sizeof NGIRCd_VersionAddition);
 399 #endif
 400 #ifdef SYSLOG
 401         if (NGIRCd_VersionAddition[0])
 402                 strlcat(NGIRCd_VersionAddition, "+",
 403                         sizeof NGIRCd_VersionAddition);
 404         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 405                 sizeof NGIRCd_VersionAddition);
 406 #endif
 407 #ifdef TCPWRAP
 408         if (NGIRCd_VersionAddition[0])
 409                 strlcat(NGIRCd_VersionAddition, "+",
 410                         sizeof NGIRCd_VersionAddition);
 411         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 412                 sizeof NGIRCd_VersionAddition);
 413 #endif
 414 #ifdef ZLIB
 415         if (NGIRCd_VersionAddition[0])
 416                 strlcat(NGIRCd_VersionAddition, "+",
 417                         sizeof NGIRCd_VersionAddition);
 418         strlcat(NGIRCd_VersionAddition, "ZLIB",
 419                 sizeof NGIRCd_VersionAddition);
 420 #endif
 421         if (NGIRCd_VersionAddition[0])
 422                 strlcat(NGIRCd_VersionAddition, "-",
 423                         sizeof(NGIRCd_VersionAddition));
 424
 425         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 426                 sizeof(NGIRCd_VersionAddition));
 427         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 428         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 429                 sizeof(NGIRCd_VersionAddition));
 430         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 431         strlcat(NGIRCd_VersionAddition, HOST_OS,
 432                 sizeof(NGIRCd_VersionAddition));
 433
 434         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 435                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 436 } /* Fill_Version */
 437
 438
 439 /**
 440  * Display copyright and version information of ngIRCd on the console.
 441  */
 442 static void
 443 Show_Version( void )
 444 {
 445         puts( NGIRCd_Version );
 446         puts( "Copyright (c)2001-2023 Alexander Barton (<alex@barton.de>) and Contributors." );
 447         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 448         puts( "This is free software; see the source for copying conditions. There is NO" );
 449         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 450 } /* Show_Version */
 451
 452
 453 /**
 454  * Display a short help text on the console.
 455  * This help depends on the configuration of the executable and only shows
 456  * options that are actually enabled.
 457  */
 458 static void
 459 Show_Help( void )
 460 {
 461         puts( "  -d, --debug        log extra debug messages" );
 462         puts( "  -f, --config <f>   use file <f> as configuration file" );
 463         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 464         puts( "  -p, --passive      disable automatic connections to other servers" );
 465 #ifdef SNIFFER
 466         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 467 #endif
 468         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 469         puts( "  -V, --version      output version information and exit" );
 470         puts( "  -h, --help         display this help and exit" );
 471 } /* Show_Help */
 472
 473
 474 /**
 475  * Delete the file containing the process ID (PID).
 476  */
 477 static void
 478 Pidfile_Delete( void )
 479 {
 480         /* Pidfile configured? */
 481         if( ! Conf_PidFile[0] ) return;
 482
 483         LogDebug( "Removing PID file (%s) ...", Conf_PidFile );
 484
 485         if( unlink( Conf_PidFile ))
 486                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 487 } /* Pidfile_Delete */
 488
 489
 490 /**
 491  * Create the file containing the process ID of ngIRCd ("PID file").
 492  *
 493  * @param pid   The process ID to be stored in this file.
 494  */
 495 static void
 496 Pidfile_Create(pid_t pid)
 497 {
 498         int pidfd;
 499         char pidbuf[64];
 500         int len;
 501
 502         /* Pidfile configured? */
 503         if( ! Conf_PidFile[0] ) return;
 504
 505         LogDebug( "Creating PID file (%s) ...", Conf_PidFile );
 506
 507         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 508         if ( pidfd < 0 ) {
 509                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 510                 return;
 511         }
 512
 513         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 514         if (len < 0 || len >= (int)sizeof pidbuf) {
 515                 Log(LOG_ERR, "Error converting process ID!");
 516                 close(pidfd);
 517                 return;
 518         }
 519
 520         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 521                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 522                     strerror(errno));
 523
 524         if (close(pidfd) != 0)
 525                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 526                     strerror(errno));
 527 } /* Pidfile_Create */
 528
 529
 530 /**
 531  * Redirect stdin, stdout and stderr to appropriate file handles.
 532  *
 533  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 534  */
 535 static void
 536 Setup_FDStreams(int fd)
 537 {
 538         if (fd < 0)
 539                 return;
 540
 541         fflush(stdout);
 542         fflush(stderr);
 543
 544         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 545         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 546 } /* Setup_FDStreams */
 547
 548
 549 #if !defined(SINGLE_USER_OS)
 550
 551 /**
 552  * Get user and group ID of unprivileged "nobody" user.
 553  *
 554  * @param uid   User ID
 555  * @param gid   Group ID
 556  * @return      true on success.
 557  */
 558 static bool
 559 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 560 {
 561         struct passwd *pwd;
 562
 563 #ifdef __CYGWIN__
 564         /* Cygwin kludge.
 565          * It can return EINVAL instead of EPERM
 566          * so, if we are already unprivileged,
 567          * use id of current user.
 568          */
 569         if (geteuid() && getuid()) {
 570                 *uid = getuid();
 571                 *gid = getgid();
 572                 return true;
 573         }
 574 #endif
 575
 576         pwd = getpwnam("nobody");
 577         if (!pwd)
 578                 return false;
 579
 580         if (!pwd->pw_uid || !pwd->pw_gid)
 581                 return false;
 582
 583         *uid = pwd->pw_uid;
 584         *gid = pwd->pw_gid;
 585         endpwent();
 586
 587         return true;
 588 } /* NGIRCd_getNobodyID */
 589
 590 #endif
 591
 592
 593 #ifdef HAVE_ARC4RANDOM
 594 static void
 595 Random_Init(void)
 596 {
 597
 598 }
 599 #else
 600 static bool
 601 Random_Init_Kern(const char *file)
 602 {
 603         unsigned int seed;
 604         bool ret = false;
 605         int fd = open(file, O_RDONLY);
 606         if (fd >= 0) {
 607                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 608                         ret = true;
 609                 close(fd);
 610                 srand(seed);
 611         }
 612         return ret;
 613 }
 614
 615 /**
 616  * Initialize libc rand(3) number generator
 617  */
 618 static void
 619 Random_Init(void)
 620 {
 621         if (Random_Init_Kern("/dev/urandom"))
 622                 return;
 623         if (Random_Init_Kern("/dev/random"))
 624                 return;
 625         if (Random_Init_Kern("/dev/arandom"))
 626                 return;
 627         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 628 }
 629 #endif
 630
 631
 632 /**
 633  * Initialize ngIRCd daemon.
 634  *
 635  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 636  *              foreground (and not as a daemon).
 637  * @return true on success.
 638  */
 639 static bool
 640 NGIRCd_Init(bool NGIRCd_NoDaemon)
 641 {
 642         static bool initialized;
 643         bool chrooted = false;
 644         struct passwd *pwd;
 645         struct group *grp;
 646         int real_errno, fd = -1;
 647         pid_t pid;
 648
 649         if (initialized)
 650                 return true;
 651
 652         if (!NGIRCd_NoDaemon) {
 653                 /* open /dev/null before chroot() */
 654                 fd = open( "/dev/null", O_RDWR);
 655                 if (fd < 0)
 656                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 657                             strerror(errno));
 658         }
 659
 660         /* SSL initialization */
 661         if (!ConnSSL_InitLibrary()) {
 662                 Log(LOG_ERR, "Error during SSL initialization!");
 663                 goto out;
 664         }
 665
 666         /* Change root */
 667         if (Conf_Chroot[0]) {
 668                 if (chdir(Conf_Chroot) != 0) {
 669                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 670                             Conf_Chroot, strerror(errno));
 671                         goto out;
 672                 }
 673
 674                 if (chroot(Conf_Chroot) != 0) {
 675                         Log(LOG_ERR,
 676                             "Can't change root directory to \"%s\": %s!",
 677                             Conf_Chroot, strerror(errno));
 678                         goto out;
 679                 } else {
 680                         chrooted = true;
 681                         Log(LOG_INFO,
 682                             "Changed root and working directory to \"%s\".",
 683                             Conf_Chroot);
 684                 }
 685         }
 686
 687 #if !defined(SINGLE_USER_OS)
 688         /* Check user ID */
 689         if (Conf_UID == 0) {
 690                 pwd = getpwuid(0);
 691                 Log(LOG_INFO,
 692                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 693                     pwd ? pwd->pw_name : "?");
 694                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 695                         Log(LOG_WARNING,
 696                             "Could not get user/group ID of user \"nobody\": %s",
 697                             errno ? strerror(errno) : "not found" );
 698                         goto out;
 699                 }
 700         }
 701
 702         /* Change group ID */
 703         if (getgid() != Conf_GID) {
 704                 if (setgid(Conf_GID) != 0) {
 705                         real_errno = errno;
 706                         grp = getgrgid(Conf_GID);
 707                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 708                             grp ? grp->gr_name : "?", Conf_GID,
 709                             strerror(real_errno));
 710                         if (real_errno != EPERM)
 711                                 goto out;
 712                 }
 713 #ifdef HAVE_SETGROUPS
 714                 if (setgroups(0, NULL) != 0) {
 715                         real_errno = errno;
 716                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 717                                         strerror(errno));
 718                         if (real_errno != EPERM)
 719                                 goto out;
 720                 }
 721 #else
 722                 Log(LOG_WARNING,
 723                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 724 #endif
 725         }
 726 #endif
 727
 728         /* Change user ID */
 729         if (getuid() != Conf_UID) {
 730                 if (setuid(Conf_UID) != 0) {
 731                         real_errno = errno;
 732                         pwd = getpwuid(Conf_UID);
 733                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 734                             pwd ? pwd->pw_name : "?", Conf_UID,
 735                             strerror(real_errno));
 736                         if (real_errno != EPERM)
 737                                 goto out;
 738                 }
 739         }
 740
 741         initialized = true;
 742
 743         /* Normally a child process is forked which isn't any longer
 744          * connected to ther controlling terminal. Use "--nodaemon"
 745          * to disable this "daemon mode" (useful for debugging). */
 746         if (!NGIRCd_NoDaemon) {
 747                 pid = fork();
 748                 if (pid > 0) {
 749                         /* "Old" process: exit. */
 750                         exit(0);
 751                 }
 752                 if (pid < 0) {
 753                         /* Error!? */
 754                         fprintf(stderr,
 755                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 756                                 PACKAGE_NAME, strerror(errno));
 757                         exit(1);
 758                 }
 759
 760                 /* New child process */
 761 #ifdef HAVE_SETSID
 762                 (void)setsid();
 763 #else
 764                 setpgrp(0, getpid());
 765 #endif
 766                 if (chdir("/") != 0)
 767                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 768                                      strerror(errno));
 769
 770                 /* Detach stdin, stdout and stderr */
 771                 Setup_FDStreams(fd);
 772                 if (fd > 2)
 773                         close(fd);
 774         }
 775         pid = getpid();
 776
 777         Pidfile_Create(pid);
 778
 779         /* Check UID/GID we are running as, can be different from values
 780          * configured (e. g. if we were already started with a UID>0. */
 781         Conf_UID = getuid();
 782         Conf_GID = getgid();
 783
 784         pwd = getpwuid(Conf_UID);
 785         grp = getgrgid(Conf_GID);
 786
 787         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 788             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 789             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 790
 791         if (chrooted) {
 792                 Log(LOG_INFO, "Running with root directory \"%s\".",
 793                     Conf_Chroot );
 794                 return true;
 795         } else
 796                 Log(LOG_INFO, "Not running with changed root directory.");
 797
 798         /* Change working directory to home directory of the user we are
 799          * running as (only when running in daemon mode and not in chroot) */
 800
 801         if (NGIRCd_NoDaemon)
 802                 return true;
 803
 804         if (pwd) {
 805                 if (chdir(pwd->pw_dir) == 0)
 806                         LogDebug(
 807                             "Changed working directory to \"%s\" ...",
 808                             pwd->pw_dir);
 809                 else
 810                         Log(LOG_ERR,
 811                             "Can't change working directory to \"%s\": %s!",
 812                             pwd->pw_dir, strerror(errno));
 813         } else
 814                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 815
 816         return true;
 817  out:
 818         if (fd > 2)
 819                 close(fd);
 820         return false;
 821 } /* NGIRCd_Init */
 822
 823
 824 /* -eof- */