src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2022 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, NGIRCd_NoSyslog = 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                                 NGIRCd_NoSyslog = true;
 134                                 ok = true;
 135                         }
 136                         if (strcmp(argv[i], "--passive") == 0) {
 137                                 NGIRCd_Passive = true;
 138                                 ok = true;
 139                         }
 140 #ifdef SNIFFER
 141                         if (strcmp(argv[i], "--sniffer") == 0) {
 142                                 NGIRCd_Sniffer = true;
 143                                 ok = true;
 144                         }
 145 #endif
 146                         if (strcmp(argv[i], "--version") == 0) {
 147                                 Show_Version();
 148                                 exit(0);
 149                         }
 150                 }
 151                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 152                         /* short option */
 153                         for (n = 1; n < strlen(argv[i]); n++) {
 154                                 ok = false;
 155 #ifdef DEBUG
 156                                 if (argv[i][n] == 'd') {
 157                                         NGIRCd_Debug = true;
 158                                         ok = true;
 159                                 }
 160 #endif
 161                                 if (argv[i][n] == 'f') {
 162                                         if (!argv[i][n+1] && i+1 < argc) {
 163                                                 /* Ok, next character is a blank */
 164                                                 strlcpy(NGIRCd_ConfFile, argv[i+1],
 165                                                         sizeof(NGIRCd_ConfFile));
 166
 167                                                 /* go to the following parameter */
 168                                                 i++;
 169                                                 n = strlen(argv[i]);
 170                                                 ok = true;
 171                                         }
 172                                 }
 173
 174                                 if (argv[i][n] == 'h') {
 175                                         Show_Version();
 176                                         puts(""); Show_Help(); puts("");
 177                                         exit(1);
 178                                 }
 179
 180                                 if (argv[i][n] == 'n') {
 181                                         NGIRCd_NoDaemon = true;
 182                                         NGIRCd_NoSyslog = true;
 183                                         ok = true;
 184                                 }
 185                                 if (argv[i][n] == 'p') {
 186                                         NGIRCd_Passive = true;
 187                                         ok = true;
 188                                 }
 189 #ifdef SNIFFER
 190                                 if (argv[i][n] == 's') {
 191                                         NGIRCd_Sniffer = true;
 192                                         ok = true;
 193                                 }
 194 #endif
 195                                 if (argv[i][n] == 't') {
 196                                         configtest = true;
 197                                         ok = true;
 198                                 }
 199
 200                                 if (argv[i][n] == 'V') {
 201                                         Show_Version();
 202                                         exit(1);
 203                                 }
 204
 205                                 if (!ok) {
 206                                         fprintf(stderr,
 207                                                 "%s: invalid option \"-%c\"!\n",
 208                                                 PACKAGE_NAME, argv[i][n]);
 209                                         fprintf(stderr,
 210                                                 "Try \"%s --help\" for more information.\n",
 211                                                 PACKAGE_NAME);
 212                                         exit(2);
 213                                 }
 214                         }
 215
 216                 }
 217                 if (!ok) {
 218                         fprintf(stderr, "%s: invalid option \"%s\"!\n",
 219                                 PACKAGE_NAME, argv[i]);
 220                         fprintf(stderr, "Try \"%s --help\" for more information.\n",
 221                                 PACKAGE_NAME);
 222                         exit(2);
 223                 }
 224         }
 225
 226         /* Debug level for "VERSION" command */
 227         NGIRCd_DebugLevel[0] = '\0';
 228 #ifdef DEBUG
 229         if (NGIRCd_Debug)
 230                 strcpy(NGIRCd_DebugLevel, "1");
 231 #endif
 232 #ifdef SNIFFER
 233         if (NGIRCd_Sniffer) {
 234                 NGIRCd_Debug = true;
 235                 strcpy(NGIRCd_DebugLevel, "2");
 236         }
 237 #endif
 238
 239         if (configtest) {
 240                 Show_Version(); puts("");
 241                 exit(Conf_Test());
 242         }
 243
 244         while (!NGIRCd_SignalQuit) {
 245                 /* Initialize global variables */
 246                 NGIRCd_Start = time(NULL);
 247                 (void)strftime(NGIRCd_StartStr, 64,
 248                                "%a %b %d %Y at %H:%M:%S (%Z)",
 249                                localtime(&NGIRCd_Start));
 250
 251                 NGIRCd_SignalRestart = false;
 252                 NGIRCd_SignalQuit = false;
 253
 254                 Log_Init(!NGIRCd_NoSyslog);
 255                 Random_Init();
 256                 Conf_Init();
 257                 Log_ReInit();
 258
 259                 /* Initialize the "main program":
 260                  * chroot environment, user and group ID, ... */
 261                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 262                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 263                         exit(1);
 264                 }
 265
 266                 if (!io_library_init(CONNECTION_POOL)) {
 267                         Log(LOG_ALERT,
 268                             "Fatal: Could not initialize IO routines: %s",
 269                             strerror(errno));
 270                         exit(1);
 271                 }
 272
 273                 if (!Signals_Init()) {
 274                         Log(LOG_ALERT,
 275                             "Fatal: Could not set up signal handlers: %s",
 276                             strerror(errno));
 277                         exit(1);
 278                 }
 279
 280                 Channel_Init();
 281                 Conn_Init();
 282                 Class_Init();
 283                 Client_Init();
 284
 285                 /* Create protocol and server identification. The syntax
 286                  * used by ngIRCd in PASS commands and the known "extended
 287                  * flags" are described in doc/Protocol.txt. */
 288 #ifdef IRCPLUS
 289                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 290                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 291                          IRCPLUSFLAGS);
 292 #ifdef ZLIB
 293                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 294 #endif
 295                 if (Conf_OperCanMode)
 296                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 297 #else /* IRCPLUS */
 298                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 299                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 300 #endif /* IRCPLUS */
 301                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 302 #ifdef ZLIB
 303                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 304 #endif
 305                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 306
 307                 Channel_InitPredefined();
 308
 309                 if (Conn_InitListeners() < 1) {
 310                         Log(LOG_ALERT,
 311                             "Server isn't listening on a single port!" );
 312                         Log(LOG_ALERT,
 313                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 314                         Pidfile_Delete();
 315                         exit(1);
 316                 }
 317
 318                 /* Main Run Loop */
 319                 Conn_Handler();
 320
 321                 Conn_Exit();
 322                 Client_Exit();
 323                 Channel_Exit();
 324                 Class_Exit();
 325                 Log_Exit();
 326                 Signals_Exit();
 327         }
 328         Pidfile_Delete();
 329
 330         return 0;
 331 } /* main */
 332
 333
 334 /**
 335  * Generate ngIRCd "version strings".
 336  *
 337  * The ngIRCd version information is generated once and then stored in the
 338  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 339  * usage, for example by the IRC command "VERSION" and the --version command
 340  * line switch.
 341  */
 342 static void
 343 Fill_Version(void)
 344 {
 345         NGIRCd_VersionAddition[0] = '\0';
 346
 347 #ifdef ICONV
 348         if (NGIRCd_VersionAddition[0])
 349                 strlcat(NGIRCd_VersionAddition, "+",
 350                         sizeof NGIRCd_VersionAddition);
 351         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 352                 sizeof NGIRCd_VersionAddition);
 353 #endif
 354 #ifdef DEBUG
 355         if (NGIRCd_VersionAddition[0])
 356                 strlcat(NGIRCd_VersionAddition, "+",
 357                         sizeof NGIRCd_VersionAddition);
 358         strlcat(NGIRCd_VersionAddition, "DEBUG",
 359                 sizeof NGIRCd_VersionAddition);
 360 #endif
 361 #ifdef IDENTAUTH
 362         if (NGIRCd_VersionAddition[0])
 363                 strlcat(NGIRCd_VersionAddition, "+",
 364                         sizeof NGIRCd_VersionAddition);
 365         strlcat(NGIRCd_VersionAddition, "IDENT",
 366                 sizeof NGIRCd_VersionAddition);
 367 #endif
 368 #ifdef WANT_IPV6
 369         if (NGIRCd_VersionAddition[0])
 370                 strlcat(NGIRCd_VersionAddition, "+",
 371                         sizeof(NGIRCd_VersionAddition));
 372         strlcat(NGIRCd_VersionAddition, "IPv6",
 373                 sizeof(NGIRCd_VersionAddition));
 374 #endif
 375 #ifdef IRCPLUS
 376         if (NGIRCd_VersionAddition[0])
 377                 strlcat(NGIRCd_VersionAddition, "+",
 378                         sizeof NGIRCd_VersionAddition);
 379         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 380                 sizeof NGIRCd_VersionAddition);
 381 #endif
 382 #ifdef PAM
 383         if (NGIRCd_VersionAddition[0])
 384                 strlcat(NGIRCd_VersionAddition, "+",
 385                         sizeof NGIRCd_VersionAddition);
 386         strlcat(NGIRCd_VersionAddition, "PAM",
 387                 sizeof NGIRCd_VersionAddition);
 388 #endif
 389 #ifdef STRICT_RFC
 390         if (NGIRCd_VersionAddition[0])
 391                 strlcat(NGIRCd_VersionAddition, "+",
 392                         sizeof NGIRCd_VersionAddition);
 393         strlcat(NGIRCd_VersionAddition, "RFC",
 394                 sizeof NGIRCd_VersionAddition);
 395 #endif
 396 #ifdef SNIFFER
 397         if (NGIRCd_VersionAddition[0])
 398                 strlcat(NGIRCd_VersionAddition, "+",
 399                         sizeof NGIRCd_VersionAddition);
 400         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 401                 sizeof NGIRCd_VersionAddition);
 402 #endif
 403 #ifdef SSL_SUPPORT
 404         if (NGIRCd_VersionAddition[0])
 405                 strlcat(NGIRCd_VersionAddition, "+",
 406                         sizeof NGIRCd_VersionAddition);
 407         strlcat(NGIRCd_VersionAddition, "SSL",
 408                 sizeof NGIRCd_VersionAddition);
 409 #endif
 410 #ifdef SYSLOG
 411         if (NGIRCd_VersionAddition[0])
 412                 strlcat(NGIRCd_VersionAddition, "+",
 413                         sizeof NGIRCd_VersionAddition);
 414         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 415                 sizeof NGIRCd_VersionAddition);
 416 #endif
 417 #ifdef TCPWRAP
 418         if (NGIRCd_VersionAddition[0])
 419                 strlcat(NGIRCd_VersionAddition, "+",
 420                         sizeof NGIRCd_VersionAddition);
 421         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 422                 sizeof NGIRCd_VersionAddition);
 423 #endif
 424 #ifdef ZLIB
 425         if (NGIRCd_VersionAddition[0])
 426                 strlcat(NGIRCd_VersionAddition, "+",
 427                         sizeof NGIRCd_VersionAddition);
 428         strlcat(NGIRCd_VersionAddition, "ZLIB",
 429                 sizeof NGIRCd_VersionAddition);
 430 #endif
 431         if (NGIRCd_VersionAddition[0])
 432                 strlcat(NGIRCd_VersionAddition, "-",
 433                         sizeof(NGIRCd_VersionAddition));
 434
 435         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 436                 sizeof(NGIRCd_VersionAddition));
 437         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 438         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 439                 sizeof(NGIRCd_VersionAddition));
 440         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 441         strlcat(NGIRCd_VersionAddition, HOST_OS,
 442                 sizeof(NGIRCd_VersionAddition));
 443
 444         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 445                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 446 } /* Fill_Version */
 447
 448
 449 /**
 450  * Display copyright and version information of ngIRCd on the console.
 451  */
 452 static void
 453 Show_Version( void )
 454 {
 455         puts( NGIRCd_Version );
 456         puts( "Copyright (c)2001-2022 Alexander Barton (<alex@barton.de>) and Contributors." );
 457         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 458         puts( "This is free software; see the source for copying conditions. There is NO" );
 459         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 460 } /* Show_Version */
 461
 462
 463 /**
 464  * Display a short help text on the console.
 465  * This help depends on the configuration of the executable and only shows
 466  * options that are actually enabled.
 467  */
 468 static void
 469 Show_Help( void )
 470 {
 471 #ifdef DEBUG
 472         puts( "  -d, --debug        log extra debug messages" );
 473 #endif
 474         puts( "  -f, --config <f>   use file <f> as configuration file" );
 475         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 476         puts( "  -p, --passive      disable automatic connections to other servers" );
 477 #ifdef SNIFFER
 478         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 479 #endif
 480         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 481         puts( "  -V, --version      output version information and exit" );
 482         puts( "  -h, --help         display this help and exit" );
 483 } /* Show_Help */
 484
 485
 486 /**
 487  * Delete the file containing the process ID (PID).
 488  */
 489 static void
 490 Pidfile_Delete( void )
 491 {
 492         /* Pidfile configured? */
 493         if( ! Conf_PidFile[0] ) return;
 494
 495 #ifdef DEBUG
 496         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 497 #endif
 498
 499         if( unlink( Conf_PidFile ))
 500                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 501 } /* Pidfile_Delete */
 502
 503
 504 /**
 505  * Create the file containing the process ID of ngIRCd ("PID file").
 506  *
 507  * @param pid   The process ID to be stored in this file.
 508  */
 509 static void
 510 Pidfile_Create(pid_t pid)
 511 {
 512         int pidfd;
 513         char pidbuf[64];
 514         int len;
 515
 516         /* Pidfile configured? */
 517         if( ! Conf_PidFile[0] ) return;
 518
 519 #ifdef DEBUG
 520         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 521 #endif
 522
 523         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 524         if ( pidfd < 0 ) {
 525                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 526                 return;
 527         }
 528
 529         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 530         if (len < 0 || len >= (int)sizeof pidbuf) {
 531                 Log(LOG_ERR, "Error converting process ID!");
 532                 close(pidfd);
 533                 return;
 534         }
 535
 536         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 537                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 538                     strerror(errno));
 539
 540         if (close(pidfd) != 0)
 541                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 542                     strerror(errno));
 543 } /* Pidfile_Create */
 544
 545
 546 /**
 547  * Redirect stdin, stdout and stderr to appropriate file handles.
 548  *
 549  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 550  */
 551 static void
 552 Setup_FDStreams(int fd)
 553 {
 554         if (fd < 0)
 555                 return;
 556
 557         fflush(stdout);
 558         fflush(stderr);
 559
 560         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 561         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 562 } /* Setup_FDStreams */
 563
 564
 565 #if !defined(SINGLE_USER_OS)
 566
 567 /**
 568  * Get user and group ID of unprivileged "nobody" user.
 569  *
 570  * @param uid   User ID
 571  * @param gid   Group ID
 572  * @return      true on success.
 573  */
 574 static bool
 575 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 576 {
 577         struct passwd *pwd;
 578
 579 #ifdef __CYGWIN__
 580         /* Cygwin kludge.
 581          * It can return EINVAL instead of EPERM
 582          * so, if we are already unprivileged,
 583          * use id of current user.
 584          */
 585         if (geteuid() && getuid()) {
 586                 *uid = getuid();
 587                 *gid = getgid();
 588                 return true;
 589         }
 590 #endif
 591
 592         pwd = getpwnam("nobody");
 593         if (!pwd)
 594                 return false;
 595
 596         if (!pwd->pw_uid || !pwd->pw_gid)
 597                 return false;
 598
 599         *uid = pwd->pw_uid;
 600         *gid = pwd->pw_gid;
 601         endpwent();
 602
 603         return true;
 604 } /* NGIRCd_getNobodyID */
 605
 606 #endif
 607
 608
 609 #ifdef HAVE_ARC4RANDOM
 610 static void
 611 Random_Init(void)
 612 {
 613
 614 }
 615 #else
 616 static bool
 617 Random_Init_Kern(const char *file)
 618 {
 619         unsigned int seed;
 620         bool ret = false;
 621         int fd = open(file, O_RDONLY);
 622         if (fd >= 0) {
 623                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 624                         ret = true;
 625                 close(fd);
 626                 srand(seed);
 627         }
 628         return ret;
 629 }
 630
 631 /**
 632  * Initialize libc rand(3) number generator
 633  */
 634 static void
 635 Random_Init(void)
 636 {
 637         if (Random_Init_Kern("/dev/urandom"))
 638                 return;
 639         if (Random_Init_Kern("/dev/random"))
 640                 return;
 641         if (Random_Init_Kern("/dev/arandom"))
 642                 return;
 643         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 644 }
 645 #endif
 646
 647
 648 /**
 649  * Initialize ngIRCd daemon.
 650  *
 651  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 652  *              foreground (and not as a daemon).
 653  * @return true on success.
 654  */
 655 static bool
 656 NGIRCd_Init(bool NGIRCd_NoDaemon)
 657 {
 658         static bool initialized;
 659         bool chrooted = false;
 660         struct passwd *pwd;
 661         struct group *grp;
 662         int real_errno, fd = -1;
 663         pid_t pid;
 664
 665         if (initialized)
 666                 return true;
 667
 668         if (!NGIRCd_NoDaemon) {
 669                 /* open /dev/null before chroot() */
 670                 fd = open( "/dev/null", O_RDWR);
 671                 if (fd < 0)
 672                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 673                             strerror(errno));
 674         }
 675
 676         /* SSL initialization */
 677         if (!ConnSSL_InitLibrary()) {
 678                 Log(LOG_ERR, "Error during SSL initialization!");
 679                 goto out;
 680         }
 681
 682         /* Change root */
 683         if (Conf_Chroot[0]) {
 684                 if (chdir(Conf_Chroot) != 0) {
 685                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 686                             Conf_Chroot, strerror(errno));
 687                         goto out;
 688                 }
 689
 690                 if (chroot(Conf_Chroot) != 0) {
 691                         Log(LOG_ERR,
 692                             "Can't change root directory to \"%s\": %s!",
 693                             Conf_Chroot, strerror(errno));
 694                         goto out;
 695                 } else {
 696                         chrooted = true;
 697                         Log(LOG_INFO,
 698                             "Changed root and working directory to \"%s\".",
 699                             Conf_Chroot);
 700                 }
 701         }
 702
 703 #if !defined(SINGLE_USER_OS)
 704         /* Check user ID */
 705         if (Conf_UID == 0) {
 706                 pwd = getpwuid(0);
 707                 Log(LOG_INFO,
 708                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 709                     pwd ? pwd->pw_name : "?");
 710                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 711                         Log(LOG_WARNING,
 712                             "Could not get user/group ID of user \"nobody\": %s",
 713                             errno ? strerror(errno) : "not found" );
 714                         goto out;
 715                 }
 716         }
 717
 718         /* Change group ID */
 719         if (getgid() != Conf_GID) {
 720                 if (setgid(Conf_GID) != 0) {
 721                         real_errno = errno;
 722                         grp = getgrgid(Conf_GID);
 723                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 724                             grp ? grp->gr_name : "?", Conf_GID,
 725                             strerror(real_errno));
 726                         if (real_errno != EPERM)
 727                                 goto out;
 728                 }
 729 #ifdef HAVE_SETGROUPS
 730                 if (setgroups(0, NULL) != 0) {
 731                         real_errno = errno;
 732                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 733                                         strerror(errno));
 734                         if (real_errno != EPERM)
 735                                 goto out;
 736                 }
 737 #else
 738                 Log(LOG_WARNING,
 739                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 740 #endif
 741         }
 742 #endif
 743
 744         /* Change user ID */
 745         if (getuid() != Conf_UID) {
 746                 if (setuid(Conf_UID) != 0) {
 747                         real_errno = errno;
 748                         pwd = getpwuid(Conf_UID);
 749                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 750                             pwd ? pwd->pw_name : "?", Conf_UID,
 751                             strerror(real_errno));
 752                         if (real_errno != EPERM)
 753                                 goto out;
 754                 }
 755         }
 756
 757         initialized = true;
 758
 759         /* Normally a child process is forked which isn't any longer
 760          * connected to ther controlling terminal. Use "--nodaemon"
 761          * to disable this "daemon mode" (useful for debugging). */
 762         if (!NGIRCd_NoDaemon) {
 763                 pid = fork();
 764                 if (pid > 0) {
 765                         /* "Old" process: exit. */
 766                         exit(0);
 767                 }
 768                 if (pid < 0) {
 769                         /* Error!? */
 770                         fprintf(stderr,
 771                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 772                                 PACKAGE_NAME, strerror(errno));
 773                         exit(1);
 774                 }
 775
 776                 /* New child process */
 777 #ifdef HAVE_SETSID
 778                 (void)setsid();
 779 #else
 780                 setpgrp(0, getpid());
 781 #endif
 782                 if (chdir("/") != 0)
 783                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 784                                      strerror(errno));
 785
 786                 /* Detach stdin, stdout and stderr */
 787                 Setup_FDStreams(fd);
 788                 if (fd > 2)
 789                         close(fd);
 790         }
 791         pid = getpid();
 792
 793         Pidfile_Create(pid);
 794
 795         /* Check UID/GID we are running as, can be different from values
 796          * configured (e. g. if we were already started with a UID>0. */
 797         Conf_UID = getuid();
 798         Conf_GID = getgid();
 799
 800         pwd = getpwuid(Conf_UID);
 801         grp = getgrgid(Conf_GID);
 802
 803         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 804             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 805             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 806
 807         if (chrooted) {
 808                 Log(LOG_INFO, "Running with root directory \"%s\".",
 809                     Conf_Chroot );
 810                 return true;
 811         } else
 812                 Log(LOG_INFO, "Not running with changed root directory.");
 813
 814         /* Change working directory to home directory of the user we are
 815          * running as (only when running in daemon mode and not in chroot) */
 816
 817         if (NGIRCd_NoDaemon)
 818                 return true;
 819
 820         if (pwd) {
 821                 if (chdir(pwd->pw_dir) == 0)
 822                         Log(LOG_DEBUG,
 823                             "Changed working directory to \"%s\" ...",
 824                             pwd->pw_dir);
 825                 else
 826                         Log(LOG_ERR,
 827                             "Can't change working directory to \"%s\": %s!",
 828                             pwd->pw_dir, strerror(errno));
 829         } else
 830                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 831
 832         return true;
 833  out:
 834         if (fd > 2)
 835                 close(fd);
 836         return false;
 837 } /* NGIRCd_Init */
 838
 839
 840 /* -eof- */