src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2020 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 #ifdef DEBUG
  92         NGIRCd_Debug = false;
  93 #endif
  94 #ifdef SNIFFER
  95         NGIRCd_Sniffer = false;
  96 #endif
  97         strlcpy(NGIRCd_ConfFile, SYSCONFDIR, sizeof(NGIRCd_ConfFile));
  98         strlcat(NGIRCd_ConfFile, CONFIG_FILE, sizeof(NGIRCd_ConfFile));
  99
 100         Fill_Version();
 101
 102         /* parse conmmand line */
 103         for (i = 1; i < argc; i++) {
 104                 ok = false;
 105                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 106                         /* long option */
 107                         if (strcmp(argv[i], "--config") == 0) {
 108                                 if (i + 1 < argc) {
 109                                         /* Ok, there's an parameter left */
 110                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 111                                                 sizeof(NGIRCd_ConfFile));
 112                                         /* next parameter */
 113                                         i++; ok = true;
 114                                 }
 115                         }
 116                         if (strcmp(argv[i], "--configtest") == 0) {
 117                                 configtest = true;
 118                                 ok = true;
 119                         }
 120 #ifdef DEBUG
 121                         if (strcmp(argv[i], "--debug") == 0) {
 122                                 NGIRCd_Debug = true;
 123                                 ok = true;
 124                         }
 125 #endif
 126                         if (strcmp(argv[i], "--help") == 0) {
 127                                 Show_Version();
 128                                 puts(""); Show_Help( ); puts( "" );
 129                                 exit(0);
 130                         }
 131                         if (strcmp(argv[i], "--nodaemon") == 0) {
 132                                 NGIRCd_NoDaemon = true;
 133                                 ok = true;
 134                         }
 135                         if (strcmp(argv[i], "--passive") == 0) {
 136                                 NGIRCd_Passive = true;
 137                                 ok = true;
 138                         }
 139 #ifdef SNIFFER
 140                         if (strcmp(argv[i], "--sniffer") == 0) {
 141                                 NGIRCd_Sniffer = true;
 142                                 ok = true;
 143                         }
 144 #endif
 145                         if (strcmp(argv[i], "--version") == 0) {
 146                                 Show_Version();
 147                                 exit(0);
 148                         }
 149                 }
 150                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 151                         /* short option */
 152                         for (n = 1; n < strlen(argv[i]); n++) {
 153                                 ok = false;
 154 #ifdef DEBUG
 155                                 if (argv[i][n] == 'd') {
 156                                         NGIRCd_Debug = true;
 157                                         ok = true;
 158                                 }
 159 #endif
 160                                 if (argv[i][n] == 'f') {
 161                                         if (!argv[i][n+1] && i+1 < argc) {
 162                                                 /* Ok, next character is a blank */
 163                                                 strlcpy(NGIRCd_ConfFile, argv[i+1],
 164                                                         sizeof(NGIRCd_ConfFile));
 165
 166                                                 /* go to the following parameter */
 167                                                 i++;
 168                                                 n = strlen(argv[i]);
 169                                                 ok = true;
 170                                         }
 171                                 }
 172
 173                                 if (argv[i][n] == 'h') {
 174                                         Show_Version();
 175                                         puts(""); Show_Help(); puts("");
 176                                         exit(1);
 177                                 }
 178
 179                                 if (argv[i][n] == 'n') {
 180                                         NGIRCd_NoDaemon = true;
 181                                         ok = true;
 182                                 }
 183                                 if (argv[i][n] == 'p') {
 184                                         NGIRCd_Passive = true;
 185                                         ok = true;
 186                                 }
 187 #ifdef SNIFFER
 188                                 if (argv[i][n] == 's') {
 189                                         NGIRCd_Sniffer = true;
 190                                         ok = true;
 191                                 }
 192 #endif
 193                                 if (argv[i][n] == 't') {
 194                                         configtest = true;
 195                                         ok = true;
 196                                 }
 197
 198                                 if (argv[i][n] == 'V') {
 199                                         Show_Version();
 200                                         exit(1);
 201                                 }
 202
 203                                 if (!ok) {
 204                                         fprintf(stderr,
 205                                                 "%s: invalid option \"-%c\"!\n",
 206                                                 PACKAGE_NAME, argv[i][n]);
 207                                         fprintf(stderr,
 208                                                 "Try \"%s --help\" for more information.\n",
 209                                                 PACKAGE_NAME);
 210                                         exit(2);
 211                                 }
 212                         }
 213
 214                 }
 215                 if (!ok) {
 216                         fprintf(stderr, "%s: invalid option \"%s\"!\n",
 217                                 PACKAGE_NAME, argv[i]);
 218                         fprintf(stderr, "Try \"%s --help\" for more information.\n",
 219                                 PACKAGE_NAME);
 220                         exit(2);
 221                 }
 222         }
 223
 224         /* Debug level for "VERSION" command */
 225         NGIRCd_DebugLevel[0] = '\0';
 226 #ifdef DEBUG
 227         if (NGIRCd_Debug)
 228                 strcpy(NGIRCd_DebugLevel, "1");
 229 #endif
 230 #ifdef SNIFFER
 231         if (NGIRCd_Sniffer) {
 232                 NGIRCd_Debug = true;
 233                 strcpy(NGIRCd_DebugLevel, "2");
 234         }
 235 #endif
 236
 237         if (configtest) {
 238                 Show_Version(); puts("");
 239                 exit(Conf_Test());
 240         }
 241
 242         while (!NGIRCd_SignalQuit) {
 243                 /* Initialize global variables */
 244                 NGIRCd_Start = time(NULL);
 245                 (void)strftime(NGIRCd_StartStr, 64,
 246                                "%a %b %d %Y at %H:%M:%S (%Z)",
 247                                localtime(&NGIRCd_Start));
 248
 249                 NGIRCd_SignalRestart = false;
 250                 NGIRCd_SignalQuit = false;
 251
 252                 Log_Init(!NGIRCd_NoDaemon);
 253                 Random_Init();
 254                 Conf_Init();
 255                 Log_ReInit();
 256
 257                 /* Initialize the "main program":
 258                  * chroot environment, user and group ID, ... */
 259                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 260                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 261                         exit(1);
 262                 }
 263
 264                 if (!io_library_init(CONNECTION_POOL)) {
 265                         Log(LOG_ALERT,
 266                             "Fatal: Could not initialize IO routines: %s",
 267                             strerror(errno));
 268                         exit(1);
 269                 }
 270
 271                 if (!Signals_Init()) {
 272                         Log(LOG_ALERT,
 273                             "Fatal: Could not set up signal handlers: %s",
 274                             strerror(errno));
 275                         exit(1);
 276                 }
 277
 278                 Channel_Init();
 279                 Conn_Init();
 280                 Class_Init();
 281                 Client_Init();
 282
 283                 /* Create protocol and server identification. The syntax
 284                  * used by ngIRCd in PASS commands and the known "extended
 285                  * flags" are described in doc/Protocol.txt. */
 286 #ifdef IRCPLUS
 287                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 288                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 289                          IRCPLUSFLAGS);
 290 #ifdef ZLIB
 291                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 292 #endif
 293                 if (Conf_OperCanMode)
 294                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 295 #else /* IRCPLUS */
 296                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 297                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 298 #endif /* IRCPLUS */
 299                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 300 #ifdef ZLIB
 301                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 302 #endif
 303                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 304
 305                 Channel_InitPredefined();
 306
 307                 if (Conn_InitListeners() < 1) {
 308                         Log(LOG_ALERT,
 309                             "Server isn't listening on a single port!" );
 310                         Log(LOG_ALERT,
 311                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 312                         Pidfile_Delete();
 313                         exit(1);
 314                 }
 315
 316                 /* Main Run Loop */
 317                 Conn_Handler();
 318
 319                 Conn_Exit();
 320                 Client_Exit();
 321                 Channel_Exit();
 322                 Class_Exit();
 323                 Log_Exit();
 324                 Signals_Exit();
 325         }
 326         Pidfile_Delete();
 327
 328         return 0;
 329 } /* main */
 330
 331
 332 /**
 333  * Generate ngIRCd "version strings".
 334  *
 335  * The ngIRCd version information is generated once and then stored in the
 336  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 337  * usage, for example by the IRC command "VERSION" and the --version command
 338  * line switch.
 339  */
 340 static void
 341 Fill_Version(void)
 342 {
 343         NGIRCd_VersionAddition[0] = '\0';
 344
 345 #ifdef ICONV
 346         if (NGIRCd_VersionAddition[0])
 347                 strlcat(NGIRCd_VersionAddition, "+",
 348                         sizeof NGIRCd_VersionAddition);
 349         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 350                 sizeof NGIRCd_VersionAddition);
 351 #endif
 352 #ifdef DEBUG
 353         if (NGIRCd_VersionAddition[0])
 354                 strlcat(NGIRCd_VersionAddition, "+",
 355                         sizeof NGIRCd_VersionAddition);
 356         strlcat(NGIRCd_VersionAddition, "DEBUG",
 357                 sizeof NGIRCd_VersionAddition);
 358 #endif
 359 #ifdef IDENTAUTH
 360         if (NGIRCd_VersionAddition[0])
 361                 strlcat(NGIRCd_VersionAddition, "+",
 362                         sizeof NGIRCd_VersionAddition);
 363         strlcat(NGIRCd_VersionAddition, "IDENT",
 364                 sizeof NGIRCd_VersionAddition);
 365 #endif
 366 #ifdef WANT_IPV6
 367         if (NGIRCd_VersionAddition[0])
 368                 strlcat(NGIRCd_VersionAddition, "+",
 369                         sizeof(NGIRCd_VersionAddition));
 370         strlcat(NGIRCd_VersionAddition, "IPv6",
 371                 sizeof(NGIRCd_VersionAddition));
 372 #endif
 373 #ifdef IRCPLUS
 374         if (NGIRCd_VersionAddition[0])
 375                 strlcat(NGIRCd_VersionAddition, "+",
 376                         sizeof NGIRCd_VersionAddition);
 377         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 378                 sizeof NGIRCd_VersionAddition);
 379 #endif
 380 #ifdef PAM
 381         if (NGIRCd_VersionAddition[0])
 382                 strlcat(NGIRCd_VersionAddition, "+",
 383                         sizeof NGIRCd_VersionAddition);
 384         strlcat(NGIRCd_VersionAddition, "PAM",
 385                 sizeof NGIRCd_VersionAddition);
 386 #endif
 387 #ifdef STRICT_RFC
 388         if (NGIRCd_VersionAddition[0])
 389                 strlcat(NGIRCd_VersionAddition, "+",
 390                         sizeof NGIRCd_VersionAddition);
 391         strlcat(NGIRCd_VersionAddition, "RFC",
 392                 sizeof NGIRCd_VersionAddition);
 393 #endif
 394 #ifdef SNIFFER
 395         if (NGIRCd_VersionAddition[0])
 396                 strlcat(NGIRCd_VersionAddition, "+",
 397                         sizeof NGIRCd_VersionAddition);
 398         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 399                 sizeof NGIRCd_VersionAddition);
 400 #endif
 401 #ifdef SSL_SUPPORT
 402         if (NGIRCd_VersionAddition[0])
 403                 strlcat(NGIRCd_VersionAddition, "+",
 404                         sizeof NGIRCd_VersionAddition);
 405         strlcat(NGIRCd_VersionAddition, "SSL",
 406                 sizeof NGIRCd_VersionAddition);
 407 #endif
 408 #ifdef SYSLOG
 409         if (NGIRCd_VersionAddition[0])
 410                 strlcat(NGIRCd_VersionAddition, "+",
 411                         sizeof NGIRCd_VersionAddition);
 412         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 413                 sizeof NGIRCd_VersionAddition);
 414 #endif
 415 #ifdef TCPWRAP
 416         if (NGIRCd_VersionAddition[0])
 417                 strlcat(NGIRCd_VersionAddition, "+",
 418                         sizeof NGIRCd_VersionAddition);
 419         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 420                 sizeof NGIRCd_VersionAddition);
 421 #endif
 422 #ifdef ZLIB
 423         if (NGIRCd_VersionAddition[0])
 424                 strlcat(NGIRCd_VersionAddition, "+",
 425                         sizeof NGIRCd_VersionAddition);
 426         strlcat(NGIRCd_VersionAddition, "ZLIB",
 427                 sizeof NGIRCd_VersionAddition);
 428 #endif
 429         if (NGIRCd_VersionAddition[0])
 430                 strlcat(NGIRCd_VersionAddition, "-",
 431                         sizeof(NGIRCd_VersionAddition));
 432
 433         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 434                 sizeof(NGIRCd_VersionAddition));
 435         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 436         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 437                 sizeof(NGIRCd_VersionAddition));
 438         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 439         strlcat(NGIRCd_VersionAddition, HOST_OS,
 440                 sizeof(NGIRCd_VersionAddition));
 441
 442         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 443                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 444 } /* Fill_Version */
 445
 446
 447 /**
 448  * Display copyright and version information of ngIRCd on the console.
 449  */
 450 static void
 451 Show_Version( void )
 452 {
 453         puts( NGIRCd_Version );
 454         puts( "Copyright (c)2001-2020 Alexander Barton (<alex@barton.de>) and Contributors." );
 455         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 456         puts( "This is free software; see the source for copying conditions. There is NO" );
 457         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 458 } /* Show_Version */
 459
 460
 461 /**
 462  * Display a short help text on the console.
 463  * This help depends on the configuration of the executable and only shows
 464  * options that are actually enabled.
 465  */
 466 static void
 467 Show_Help( void )
 468 {
 469 #ifdef DEBUG
 470         puts( "  -d, --debug        log extra debug messages" );
 471 #endif
 472         puts( "  -f, --config <f>   use file <f> as configuration file" );
 473         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 474         puts( "  -p, --passive      disable automatic connections to other servers" );
 475 #ifdef SNIFFER
 476         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 477 #endif
 478         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 479         puts( "  -V, --version      output version information and exit" );
 480         puts( "  -h, --help         display this help and exit" );
 481 } /* Show_Help */
 482
 483
 484 /**
 485  * Delete the file containing the process ID (PID).
 486  */
 487 static void
 488 Pidfile_Delete( void )
 489 {
 490         /* Pidfile configured? */
 491         if( ! Conf_PidFile[0] ) return;
 492
 493 #ifdef DEBUG
 494         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 495 #endif
 496
 497         if( unlink( Conf_PidFile ))
 498                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 499 } /* Pidfile_Delete */
 500
 501
 502 /**
 503  * Create the file containing the process ID of ngIRCd ("PID file").
 504  *
 505  * @param pid   The process ID to be stored in this file.
 506  */
 507 static void
 508 Pidfile_Create(pid_t pid)
 509 {
 510         int pidfd;
 511         char pidbuf[64];
 512         int len;
 513
 514         /* Pidfile configured? */
 515         if( ! Conf_PidFile[0] ) return;
 516
 517 #ifdef DEBUG
 518         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 519 #endif
 520
 521         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 522         if ( pidfd < 0 ) {
 523                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 524                 return;
 525         }
 526
 527         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 528         if (len < 0 || len >= (int)sizeof pidbuf) {
 529                 Log(LOG_ERR, "Error converting process ID!");
 530                 close(pidfd);
 531                 return;
 532         }
 533
 534         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 535                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 536                     strerror(errno));
 537
 538         if (close(pidfd) != 0)
 539                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 540                     strerror(errno));
 541 } /* Pidfile_Create */
 542
 543
 544 /**
 545  * Redirect stdin, stdout and stderr to appropriate file handles.
 546  *
 547  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 548  */
 549 static void
 550 Setup_FDStreams(int fd)
 551 {
 552         if (fd < 0)
 553                 return;
 554
 555         fflush(stdout);
 556         fflush(stderr);
 557
 558         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 559         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 560 } /* Setup_FDStreams */
 561
 562
 563 #if !defined(SINGLE_USER_OS)
 564
 565 /**
 566  * Get user and group ID of unprivileged "nobody" user.
 567  *
 568  * @param uid   User ID
 569  * @param gid   Group ID
 570  * @return      true on success.
 571  */
 572 static bool
 573 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 574 {
 575         struct passwd *pwd;
 576
 577 #ifdef __CYGWIN__
 578         /* Cygwin kludge.
 579          * It can return EINVAL instead of EPERM
 580          * so, if we are already unprivileged,
 581          * use id of current user.
 582          */
 583         if (geteuid() && getuid()) {
 584                 *uid = getuid();
 585                 *gid = getgid();
 586                 return true;
 587         }
 588 #endif
 589
 590         pwd = getpwnam("nobody");
 591         if (!pwd)
 592                 return false;
 593
 594         if (!pwd->pw_uid || !pwd->pw_gid)
 595                 return false;
 596
 597         *uid = pwd->pw_uid;
 598         *gid = pwd->pw_gid;
 599         endpwent();
 600
 601         return true;
 602 } /* NGIRCd_getNobodyID */
 603
 604 #endif
 605
 606
 607 #ifdef HAVE_ARC4RANDOM
 608 static void
 609 Random_Init(void)
 610 {
 611
 612 }
 613 #else
 614 static bool
 615 Random_Init_Kern(const char *file)
 616 {
 617         unsigned int seed;
 618         bool ret = false;
 619         int fd = open(file, O_RDONLY);
 620         if (fd >= 0) {
 621                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 622                         ret = true;
 623                 close(fd);
 624                 srand(seed);
 625         }
 626         return ret;
 627 }
 628
 629 /**
 630  * Initialize libc rand(3) number generator
 631  */
 632 static void
 633 Random_Init(void)
 634 {
 635         if (Random_Init_Kern("/dev/urandom"))
 636                 return;
 637         if (Random_Init_Kern("/dev/random"))
 638                 return;
 639         if (Random_Init_Kern("/dev/arandom"))
 640                 return;
 641         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 642 }
 643 #endif
 644
 645
 646 /**
 647  * Initialize ngIRCd daemon.
 648  *
 649  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 650  *              foreground (and not as a daemon).
 651  * @return true on success.
 652  */
 653 static bool
 654 NGIRCd_Init(bool NGIRCd_NoDaemon)
 655 {
 656         static bool initialized;
 657         bool chrooted = false;
 658         struct passwd *pwd;
 659         struct group *grp;
 660         int real_errno, fd = -1;
 661         pid_t pid;
 662
 663         if (initialized)
 664                 return true;
 665
 666         if (!NGIRCd_NoDaemon) {
 667                 /* open /dev/null before chroot() */
 668                 fd = open( "/dev/null", O_RDWR);
 669                 if (fd < 0)
 670                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 671                             strerror(errno));
 672         }
 673
 674         /* SSL initialization */
 675         if (!ConnSSL_InitLibrary()) {
 676                 Log(LOG_ERR, "Error during SSL initialization!");
 677                 goto out;
 678         }
 679
 680         /* Change root */
 681         if (Conf_Chroot[0]) {
 682                 if (chdir(Conf_Chroot) != 0) {
 683                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 684                             Conf_Chroot, strerror(errno));
 685                         goto out;
 686                 }
 687
 688                 if (chroot(Conf_Chroot) != 0) {
 689                         Log(LOG_ERR,
 690                             "Can't change root directory to \"%s\": %s!",
 691                             Conf_Chroot, strerror(errno));
 692                         goto out;
 693                 } else {
 694                         chrooted = true;
 695                         Log(LOG_INFO,
 696                             "Changed root and working directory to \"%s\".",
 697                             Conf_Chroot);
 698                 }
 699         }
 700
 701 #if !defined(SINGLE_USER_OS)
 702         /* Check user ID */
 703         if (Conf_UID == 0) {
 704                 pwd = getpwuid(0);
 705                 Log(LOG_INFO,
 706                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 707                     pwd ? pwd->pw_name : "?");
 708                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 709                         Log(LOG_WARNING,
 710                             "Could not get user/group ID of user \"nobody\": %s",
 711                             errno ? strerror(errno) : "not found" );
 712                         goto out;
 713                 }
 714         }
 715
 716         /* Change group ID */
 717         if (getgid() != Conf_GID) {
 718                 if (setgid(Conf_GID) != 0) {
 719                         real_errno = errno;
 720                         grp = getgrgid(Conf_GID);
 721                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 722                             grp ? grp->gr_name : "?", Conf_GID,
 723                             strerror(real_errno));
 724                         if (real_errno != EPERM)
 725                                 goto out;
 726                 }
 727 #ifdef HAVE_SETGROUPS
 728                 if (setgroups(0, NULL) != 0) {
 729                         real_errno = errno;
 730                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 731                                         strerror(errno));
 732                         if (real_errno != EPERM)
 733                                 goto out;
 734                 }
 735 #else
 736                 Log(LOG_WARNING,
 737                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 738 #endif
 739         }
 740 #endif
 741
 742         /* Change user ID */
 743         if (getuid() != Conf_UID) {
 744                 if (setuid(Conf_UID) != 0) {
 745                         real_errno = errno;
 746                         pwd = getpwuid(Conf_UID);
 747                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 748                             pwd ? pwd->pw_name : "?", Conf_UID,
 749                             strerror(real_errno));
 750                         if (real_errno != EPERM)
 751                                 goto out;
 752                 }
 753         }
 754
 755         initialized = true;
 756
 757         /* Normally a child process is forked which isn't any longer
 758          * connected to ther controlling terminal. Use "--nodaemon"
 759          * to disable this "daemon mode" (useful for debugging). */
 760         if (!NGIRCd_NoDaemon) {
 761                 pid = fork();
 762                 if (pid > 0) {
 763                         /* "Old" process: exit. */
 764                         exit(0);
 765                 }
 766                 if (pid < 0) {
 767                         /* Error!? */
 768                         fprintf(stderr,
 769                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 770                                 PACKAGE_NAME, strerror(errno));
 771                         exit(1);
 772                 }
 773
 774                 /* New child process */
 775 #ifdef HAVE_SETSID
 776                 (void)setsid();
 777 #else
 778                 setpgrp(0, getpid());
 779 #endif
 780                 if (chdir("/") != 0)
 781                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 782                                      strerror(errno));
 783
 784                 /* Detach stdin, stdout and stderr */
 785                 Setup_FDStreams(fd);
 786                 if (fd > 2)
 787                         close(fd);
 788         }
 789         pid = getpid();
 790
 791         Pidfile_Create(pid);
 792
 793         /* Check UID/GID we are running as, can be different from values
 794          * configured (e. g. if we were already started with a UID>0. */
 795         Conf_UID = getuid();
 796         Conf_GID = getgid();
 797
 798         pwd = getpwuid(Conf_UID);
 799         grp = getgrgid(Conf_GID);
 800
 801         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 802             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 803             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 804
 805         if (chrooted) {
 806                 Log(LOG_INFO, "Running with root directory \"%s\".",
 807                     Conf_Chroot );
 808                 return true;
 809         } else
 810                 Log(LOG_INFO, "Not running with changed root directory.");
 811
 812         /* Change working directory to home directory of the user we are
 813          * running as (only when running in daemon mode and not in chroot) */
 814
 815         if (NGIRCd_NoDaemon)
 816                 return true;
 817
 818         if (pwd) {
 819                 if (chdir(pwd->pw_dir) == 0)
 820                         Log(LOG_DEBUG,
 821                             "Changed working directory to \"%s\" ...",
 822                             pwd->pw_dir);
 823                 else
 824                         Log(LOG_ERR,
 825                             "Can't change working directory to \"%s\": %s!",
 826                             pwd->pw_dir, strerror(errno));
 827         } else
 828                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 829
 830         return true;
 831  out:
 832         if (fd > 2)
 833                 close(fd);
 834         return false;
 835 } /* NGIRCd_Init */
 836
 837
 838 /* -eof- */