src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2019 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * The main program, including the C function main() which is called
  17  * by the loader of the operating system.
  18  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <time.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <pwd.h>
  31 #include <grp.h>
  32
  33 #if defined(DEBUG) && defined(HAVE_MTRACE)
  34 #include <mcheck.h>
  35 #endif
  36
  37 #include "conn.h"
  38 #include "class.h"
  39 #include "channel.h"
  40 #include "conf.h"
  41 #include "log.h"
  42 #include "sighandlers.h"
  43 #include "io.h"
  44
  45 #include "ngircd.h"
  46
  47 static void Show_Version PARAMS(( void ));
  48 static void Show_Help PARAMS(( void ));
  49
  50 static void Pidfile_Create PARAMS(( pid_t pid ));
  51 static void Pidfile_Delete PARAMS(( void ));
  52
  53 static void Fill_Version PARAMS(( void ));
  54
  55 static void Random_Init PARAMS(( void ));
  56
  57 static void Setup_FDStreams PARAMS(( int fd ));
  58
  59 static bool NGIRCd_Init PARAMS(( bool ));
  60
  61
  62 /**
  63  * The main() function of ngIRCd.
  64  *
  65  * Here all starts: this function is called by the operating system loader,
  66  * it is the first portion of code executed of ngIRCd.
  67  *
  68  * @param argc The number of arguments passed to ngIRCd on the command line.
  69  * @param argv An array containing all the arguments passed to ngIRCd.
  70  * @return Global exit code of ngIRCd, zero on success.
  71  */
  72 GLOBAL int
  73 main(int argc, const char *argv[])
  74 {
  75         bool ok, configtest = false;
  76         bool NGIRCd_NoDaemon = false;
  77         int i;
  78         size_t n;
  79
  80 #if defined(DEBUG) && defined(HAVE_MTRACE)
  81         /* enable GNU libc memory tracing when running in debug mode
  82          * and functionality available */
  83         mtrace();
  84 #endif
  85
  86         umask(0077);
  87
  88         NGIRCd_SignalQuit = NGIRCd_SignalRestart = false;
  89         NGIRCd_Passive = false;
  90 #ifdef DEBUG
  91         NGIRCd_Debug = false;
  92 #endif
  93 #ifdef SNIFFER
  94         NGIRCd_Sniffer = false;
  95 #endif
  96         strlcpy(NGIRCd_ConfFile, SYSCONFDIR, sizeof(NGIRCd_ConfFile));
  97         strlcat(NGIRCd_ConfFile, CONFIG_FILE, sizeof(NGIRCd_ConfFile));
  98
  99         Fill_Version();
 100
 101         /* parse conmmand line */
 102         for (i = 1; i < argc; i++) {
 103                 ok = false;
 104                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 105                         /* long option */
 106                         if (strcmp(argv[i], "--config") == 0) {
 107                                 if (i + 1 < argc) {
 108                                         /* Ok, there's an parameter left */
 109                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 110                                                 sizeof(NGIRCd_ConfFile));
 111                                         /* next parameter */
 112                                         i++; ok = true;
 113                                 }
 114                         }
 115                         if (strcmp(argv[i], "--configtest") == 0) {
 116                                 configtest = true;
 117                                 ok = true;
 118                         }
 119 #ifdef DEBUG
 120                         if (strcmp(argv[i], "--debug") == 0) {
 121                                 NGIRCd_Debug = true;
 122                                 ok = true;
 123                         }
 124 #endif
 125                         if (strcmp(argv[i], "--help") == 0) {
 126                                 Show_Version();
 127                                 puts(""); Show_Help( ); puts( "" );
 128                                 exit(1);
 129                         }
 130                         if (strcmp(argv[i], "--nodaemon") == 0) {
 131                                 NGIRCd_NoDaemon = true;
 132                                 ok = true;
 133                         }
 134                         if (strcmp(argv[i], "--passive") == 0) {
 135                                 NGIRCd_Passive = true;
 136                                 ok = true;
 137                         }
 138 #ifdef SNIFFER
 139                         if (strcmp(argv[i], "--sniffer") == 0) {
 140                                 NGIRCd_Sniffer = true;
 141                                 ok = true;
 142                         }
 143 #endif
 144                         if (strcmp(argv[i], "--version") == 0) {
 145                                 Show_Version();
 146                                 exit(1);
 147                         }
 148                 }
 149                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 150                         /* short option */
 151                         for (n = 1; n < strlen(argv[i]); n++) {
 152                                 ok = false;
 153 #ifdef DEBUG
 154                                 if (argv[i][n] == 'd') {
 155                                         NGIRCd_Debug = true;
 156                                         ok = true;
 157                                 }
 158 #endif
 159                                 if (argv[i][n] == 'f') {
 160                                         if (!argv[i][n+1] && i+1 < argc) {
 161                                                 /* Ok, next character is a blank */
 162                                                 strlcpy(NGIRCd_ConfFile, argv[i+1],
 163                                                         sizeof(NGIRCd_ConfFile));
 164
 165                                                 /* go to the following parameter */
 166                                                 i++;
 167                                                 n = strlen(argv[i]);
 168                                                 ok = true;
 169                                         }
 170                                 }
 171
 172                                 if (argv[i][n] == 'h') {
 173                                         Show_Version();
 174                                         puts(""); Show_Help(); puts("");
 175                                         exit(1);
 176                                 }
 177
 178                                 if (argv[i][n] == 'n') {
 179                                         NGIRCd_NoDaemon = true;
 180                                         ok = true;
 181                                 }
 182                                 if (argv[i][n] == 'p') {
 183                                         NGIRCd_Passive = true;
 184                                         ok = true;
 185                                 }
 186 #ifdef SNIFFER
 187                                 if (argv[i][n] == 's') {
 188                                         NGIRCd_Sniffer = true;
 189                                         ok = true;
 190                                 }
 191 #endif
 192                                 if (argv[i][n] == 't') {
 193                                         configtest = true;
 194                                         ok = true;
 195                                 }
 196
 197                                 if (argv[i][n] == 'V') {
 198                                         Show_Version();
 199                                         exit(1);
 200                                 }
 201
 202                                 if (!ok) {
 203                                         printf("%s: invalid option \"-%c\"!\n",
 204                                                PACKAGE_NAME, argv[i][n]);
 205                                         printf("Try \"%s --help\" for more information.\n",
 206                                                PACKAGE_NAME);
 207                                         exit(1);
 208                                 }
 209                         }
 210
 211                 }
 212                 if (!ok) {
 213                         printf("%s: invalid option \"%s\"!\n",
 214                                PACKAGE_NAME, argv[i]);
 215                         printf("Try \"%s --help\" for more information.\n",
 216                                PACKAGE_NAME);
 217                         exit(1);
 218                 }
 219         }
 220
 221         /* Debug level for "VERSION" command */
 222         NGIRCd_DebugLevel[0] = '\0';
 223 #ifdef DEBUG
 224         if (NGIRCd_Debug)
 225                 strcpy(NGIRCd_DebugLevel, "1");
 226 #endif
 227 #ifdef SNIFFER
 228         if (NGIRCd_Sniffer) {
 229                 NGIRCd_Debug = true;
 230                 strcpy(NGIRCd_DebugLevel, "2");
 231         }
 232 #endif
 233
 234         if (configtest) {
 235                 Show_Version(); puts("");
 236                 exit(Conf_Test());
 237         }
 238
 239         while (!NGIRCd_SignalQuit) {
 240                 /* Initialize global variables */
 241                 NGIRCd_Start = time(NULL);
 242                 (void)strftime(NGIRCd_StartStr, 64,
 243                                "%a %b %d %Y at %H:%M:%S (%Z)",
 244                                localtime(&NGIRCd_Start));
 245
 246                 NGIRCd_SignalRestart = false;
 247                 NGIRCd_SignalQuit = false;
 248
 249                 Log_Init(!NGIRCd_NoDaemon);
 250                 Random_Init();
 251                 Conf_Init();
 252                 Log_ReInit();
 253
 254                 /* Initialize the "main program":
 255                  * chroot environment, user and group ID, ... */
 256                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 257                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 258                         exit(1);
 259                 }
 260
 261                 if (!io_library_init(CONNECTION_POOL)) {
 262                         Log(LOG_ALERT,
 263                             "Fatal: Could not initialize IO routines: %s",
 264                             strerror(errno));
 265                         exit(1);
 266                 }
 267
 268                 if (!Signals_Init()) {
 269                         Log(LOG_ALERT,
 270                             "Fatal: Could not set up signal handlers: %s",
 271                             strerror(errno));
 272                         exit(1);
 273                 }
 274
 275                 Channel_Init();
 276                 Conn_Init();
 277                 Class_Init();
 278                 Client_Init();
 279
 280                 /* Create protocol and server identification. The syntax
 281                  * used by ngIRCd in PASS commands and the known "extended
 282                  * flags" are described in doc/Protocol.txt. */
 283 #ifdef IRCPLUS
 284                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 285                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 286                          IRCPLUSFLAGS);
 287 #ifdef ZLIB
 288                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 289 #endif
 290                 if (Conf_OperCanMode)
 291                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 292 #else /* IRCPLUS */
 293                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 294                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 295 #endif /* IRCPLUS */
 296                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 297 #ifdef ZLIB
 298                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 299 #endif
 300                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 301
 302                 Channel_InitPredefined();
 303
 304                 if (Conn_InitListeners() < 1) {
 305                         Log(LOG_ALERT,
 306                             "Server isn't listening on a single port!" );
 307                         Log(LOG_ALERT,
 308                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 309                         Pidfile_Delete();
 310                         exit(1);
 311                 }
 312
 313                 /* Main Run Loop */
 314                 Conn_Handler();
 315
 316                 Conn_Exit();
 317                 Client_Exit();
 318                 Channel_Exit();
 319                 Class_Exit();
 320                 Log_Exit();
 321                 Signals_Exit();
 322         }
 323         Pidfile_Delete();
 324
 325         return 0;
 326 } /* main */
 327
 328
 329 /**
 330  * Generate ngIRCd "version strings".
 331  *
 332  * The ngIRCd version information is generated once and then stored in the
 333  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 334  * usage, for example by the IRC command "VERSION" and the --version command
 335  * line switch.
 336  */
 337 static void
 338 Fill_Version(void)
 339 {
 340         NGIRCd_VersionAddition[0] = '\0';
 341
 342 #ifdef ICONV
 343         if (NGIRCd_VersionAddition[0])
 344                 strlcat(NGIRCd_VersionAddition, "+",
 345                         sizeof NGIRCd_VersionAddition);
 346         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 347                 sizeof NGIRCd_VersionAddition);
 348 #endif
 349 #ifdef DEBUG
 350         if (NGIRCd_VersionAddition[0])
 351                 strlcat(NGIRCd_VersionAddition, "+",
 352                         sizeof NGIRCd_VersionAddition);
 353         strlcat(NGIRCd_VersionAddition, "DEBUG",
 354                 sizeof NGIRCd_VersionAddition);
 355 #endif
 356 #ifdef IDENTAUTH
 357         if (NGIRCd_VersionAddition[0])
 358                 strlcat(NGIRCd_VersionAddition, "+",
 359                         sizeof NGIRCd_VersionAddition);
 360         strlcat(NGIRCd_VersionAddition, "IDENT",
 361                 sizeof NGIRCd_VersionAddition);
 362 #endif
 363 #ifdef WANT_IPV6
 364         if (NGIRCd_VersionAddition[0])
 365                 strlcat(NGIRCd_VersionAddition, "+",
 366                         sizeof(NGIRCd_VersionAddition));
 367         strlcat(NGIRCd_VersionAddition, "IPv6",
 368                 sizeof(NGIRCd_VersionAddition));
 369 #endif
 370 #ifdef IRCPLUS
 371         if (NGIRCd_VersionAddition[0])
 372                 strlcat(NGIRCd_VersionAddition, "+",
 373                         sizeof NGIRCd_VersionAddition);
 374         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 375                 sizeof NGIRCd_VersionAddition);
 376 #endif
 377 #ifdef PAM
 378         if (NGIRCd_VersionAddition[0])
 379                 strlcat(NGIRCd_VersionAddition, "+",
 380                         sizeof NGIRCd_VersionAddition);
 381         strlcat(NGIRCd_VersionAddition, "PAM",
 382                 sizeof NGIRCd_VersionAddition);
 383 #endif
 384 #ifdef STRICT_RFC
 385         if (NGIRCd_VersionAddition[0])
 386                 strlcat(NGIRCd_VersionAddition, "+",
 387                         sizeof NGIRCd_VersionAddition);
 388         strlcat(NGIRCd_VersionAddition, "RFC",
 389                 sizeof NGIRCd_VersionAddition);
 390 #endif
 391 #ifdef SNIFFER
 392         if (NGIRCd_VersionAddition[0])
 393                 strlcat(NGIRCd_VersionAddition, "+",
 394                         sizeof NGIRCd_VersionAddition);
 395         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 396                 sizeof NGIRCd_VersionAddition);
 397 #endif
 398 #ifdef SSL_SUPPORT
 399         if (NGIRCd_VersionAddition[0])
 400                 strlcat(NGIRCd_VersionAddition, "+",
 401                         sizeof NGIRCd_VersionAddition);
 402         strlcat(NGIRCd_VersionAddition, "SSL",
 403                 sizeof NGIRCd_VersionAddition);
 404 #endif
 405 #ifdef SYSLOG
 406         if (NGIRCd_VersionAddition[0])
 407                 strlcat(NGIRCd_VersionAddition, "+",
 408                         sizeof NGIRCd_VersionAddition);
 409         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 410                 sizeof NGIRCd_VersionAddition);
 411 #endif
 412 #ifdef TCPWRAP
 413         if (NGIRCd_VersionAddition[0])
 414                 strlcat(NGIRCd_VersionAddition, "+",
 415                         sizeof NGIRCd_VersionAddition);
 416         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 417                 sizeof NGIRCd_VersionAddition);
 418 #endif
 419 #ifdef ZLIB
 420         if (NGIRCd_VersionAddition[0])
 421                 strlcat(NGIRCd_VersionAddition, "+",
 422                         sizeof NGIRCd_VersionAddition);
 423         strlcat(NGIRCd_VersionAddition, "ZLIB",
 424                 sizeof NGIRCd_VersionAddition);
 425 #endif
 426         if (NGIRCd_VersionAddition[0])
 427                 strlcat(NGIRCd_VersionAddition, "-",
 428                         sizeof(NGIRCd_VersionAddition));
 429
 430         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 431                 sizeof(NGIRCd_VersionAddition));
 432         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 433         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 434                 sizeof(NGIRCd_VersionAddition));
 435         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 436         strlcat(NGIRCd_VersionAddition, HOST_OS,
 437                 sizeof(NGIRCd_VersionAddition));
 438
 439         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 440                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 441 } /* Fill_Version */
 442
 443
 444 /**
 445  * Display copyright and version information of ngIRCd on the console.
 446  */
 447 static void
 448 Show_Version( void )
 449 {
 450         puts( NGIRCd_Version );
 451         puts( "Copyright (c)2001-2019 Alexander Barton (<alex@barton.de>) and Contributors." );
 452         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 453         puts( "This is free software; see the source for copying conditions. There is NO" );
 454         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 455 } /* Show_Version */
 456
 457
 458 /**
 459  * Display a short help text on the console.
 460  * This help depends on the configuration of the executable and only shows
 461  * options that are actually enabled.
 462  */
 463 static void
 464 Show_Help( void )
 465 {
 466 #ifdef DEBUG
 467         puts( "  -d, --debug        log extra debug messages" );
 468 #endif
 469         puts( "  -f, --config <f>   use file <f> as configuration file" );
 470         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 471         puts( "  -p, --passive      disable automatic connections to other servers" );
 472 #ifdef SNIFFER
 473         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 474 #endif
 475         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 476         puts( "  -V, --version      output version information and exit" );
 477         puts( "  -h, --help         display this help and exit" );
 478 } /* Show_Help */
 479
 480
 481 /**
 482  * Delete the file containing the process ID (PID).
 483  */
 484 static void
 485 Pidfile_Delete( void )
 486 {
 487         /* Pidfile configured? */
 488         if( ! Conf_PidFile[0] ) return;
 489
 490 #ifdef DEBUG
 491         Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile );
 492 #endif
 493
 494         if( unlink( Conf_PidFile ))
 495                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 496 } /* Pidfile_Delete */
 497
 498
 499 /**
 500  * Create the file containing the process ID of ngIRCd ("PID file").
 501  *
 502  * @param pid   The process ID to be stored in this file.
 503  */
 504 static void
 505 Pidfile_Create(pid_t pid)
 506 {
 507         int pidfd;
 508         char pidbuf[64];
 509         int len;
 510
 511         /* Pidfile configured? */
 512         if( ! Conf_PidFile[0] ) return;
 513
 514 #ifdef DEBUG
 515         Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 516 #endif
 517
 518         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 519         if ( pidfd < 0 ) {
 520                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 521                 return;
 522         }
 523
 524         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 525         if (len < 0 || len >= (int)sizeof pidbuf) {
 526                 Log(LOG_ERR, "Error converting process ID!");
 527                 close(pidfd);
 528                 return;
 529         }
 530
 531         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 532                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 533                     strerror(errno));
 534
 535         if (close(pidfd) != 0)
 536                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 537                     strerror(errno));
 538 } /* Pidfile_Create */
 539
 540
 541 /**
 542  * Redirect stdin, stdout and stderr to appropriate file handles.
 543  *
 544  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 545  */
 546 static void
 547 Setup_FDStreams(int fd)
 548 {
 549         if (fd < 0)
 550                 return;
 551
 552         fflush(stdout);
 553         fflush(stderr);
 554
 555         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 556         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 557 } /* Setup_FDStreams */
 558
 559
 560 #if !defined(SINGLE_USER_OS)
 561
 562 /**
 563  * Get user and group ID of unprivileged "nobody" user.
 564  *
 565  * @param uid   User ID
 566  * @param gid   Group ID
 567  * @return      true on success.
 568  */
 569 static bool
 570 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 571 {
 572         struct passwd *pwd;
 573
 574 #ifdef __CYGWIN__
 575         /* Cygwin kludge.
 576          * It can return EINVAL instead of EPERM
 577          * so, if we are already unprivileged,
 578          * use id of current user.
 579          */
 580         if (geteuid() && getuid()) {
 581                 *uid = getuid();
 582                 *gid = getgid();
 583                 return true;
 584         }
 585 #endif
 586
 587         pwd = getpwnam("nobody");
 588         if (!pwd)
 589                 return false;
 590
 591         if (!pwd->pw_uid || !pwd->pw_gid)
 592                 return false;
 593
 594         *uid = pwd->pw_uid;
 595         *gid = pwd->pw_gid;
 596         endpwent();
 597
 598         return true;
 599 } /* NGIRCd_getNobodyID */
 600
 601 #endif
 602
 603
 604 #ifdef HAVE_ARC4RANDOM
 605 static void
 606 Random_Init(void)
 607 {
 608
 609 }
 610 #else
 611 static bool
 612 Random_Init_Kern(const char *file)
 613 {
 614         unsigned int seed;
 615         bool ret = false;
 616         int fd = open(file, O_RDONLY);
 617         if (fd >= 0) {
 618                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 619                         ret = true;
 620                 close(fd);
 621                 srand(seed);
 622         }
 623         return ret;
 624 }
 625
 626 /**
 627  * Initialize libc rand(3) number generator
 628  */
 629 static void
 630 Random_Init(void)
 631 {
 632         if (Random_Init_Kern("/dev/urandom"))
 633                 return;
 634         if (Random_Init_Kern("/dev/random"))
 635                 return;
 636         if (Random_Init_Kern("/dev/arandom"))
 637                 return;
 638         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 639 }
 640 #endif
 641
 642
 643 /**
 644  * Initialize ngIRCd daemon.
 645  *
 646  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 647  *              foreground (and not as a daemon).
 648  * @return true on success.
 649  */
 650 static bool
 651 NGIRCd_Init(bool NGIRCd_NoDaemon)
 652 {
 653         static bool initialized;
 654         bool chrooted = false;
 655         struct passwd *pwd;
 656         struct group *grp;
 657         int real_errno, fd = -1;
 658         pid_t pid;
 659
 660         if (initialized)
 661                 return true;
 662
 663         if (!NGIRCd_NoDaemon) {
 664                 /* open /dev/null before chroot() */
 665                 fd = open( "/dev/null", O_RDWR);
 666                 if (fd < 0)
 667                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 668                             strerror(errno));
 669         }
 670
 671         /* SSL initialization */
 672         if (!ConnSSL_InitLibrary()) {
 673                 Log(LOG_ERR, "Error during SSL initialization!");
 674                 goto out;
 675         }
 676
 677         /* Change root */
 678         if (Conf_Chroot[0]) {
 679                 if (chdir(Conf_Chroot) != 0) {
 680                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 681                             Conf_Chroot, strerror(errno));
 682                         goto out;
 683                 }
 684
 685                 if (chroot(Conf_Chroot) != 0) {
 686                         Log(LOG_ERR,
 687                             "Can't change root directory to \"%s\": %s!",
 688                             Conf_Chroot, strerror(errno));
 689                         goto out;
 690                 } else {
 691                         chrooted = true;
 692                         Log(LOG_INFO,
 693                             "Changed root and working directory to \"%s\".",
 694                             Conf_Chroot);
 695                 }
 696         }
 697
 698 #if !defined(SINGLE_USER_OS)
 699         /* Check user ID */
 700         if (Conf_UID == 0) {
 701                 pwd = getpwuid(0);
 702                 Log(LOG_INFO,
 703                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 704                     pwd ? pwd->pw_name : "?");
 705                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 706                         Log(LOG_WARNING,
 707                             "Could not get user/group ID of user \"nobody\": %s",
 708                             errno ? strerror(errno) : "not found" );
 709                         goto out;
 710                 }
 711         }
 712
 713         /* Change group ID */
 714         if (getgid() != Conf_GID) {
 715                 if (setgid(Conf_GID) != 0) {
 716                         real_errno = errno;
 717                         grp = getgrgid(Conf_GID);
 718                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 719                             grp ? grp->gr_name : "?", Conf_GID,
 720                             strerror(real_errno));
 721                         if (real_errno != EPERM)
 722                                 goto out;
 723                 }
 724 #ifdef HAVE_SETGROUPS
 725                 if (setgroups(0, NULL) != 0) {
 726                         real_errno = errno;
 727                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 728                                         strerror(errno));
 729                         if (real_errno != EPERM)
 730                                 goto out;
 731                 }
 732 #else
 733                 Log(LOG_WARNING,
 734                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 735 #endif
 736         }
 737 #endif
 738
 739         /* Change user ID */
 740         if (getuid() != Conf_UID) {
 741                 if (setuid(Conf_UID) != 0) {
 742                         real_errno = errno;
 743                         pwd = getpwuid(Conf_UID);
 744                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 745                             pwd ? pwd->pw_name : "?", Conf_UID,
 746                             strerror(real_errno));
 747                         if (real_errno != EPERM)
 748                                 goto out;
 749                 }
 750         }
 751
 752         initialized = true;
 753
 754         /* Normally a child process is forked which isn't any longer
 755          * connected to ther controlling terminal. Use "--nodaemon"
 756          * to disable this "daemon mode" (useful for debugging). */
 757         if (!NGIRCd_NoDaemon) {
 758                 pid = fork();
 759                 if (pid > 0) {
 760                         /* "Old" process: exit. */
 761                         exit(0);
 762                 }
 763                 if (pid < 0) {
 764                         /* Error!? */
 765                         fprintf(stderr,
 766                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 767                                 PACKAGE_NAME, strerror(errno));
 768                         exit(1);
 769                 }
 770
 771                 /* New child process */
 772 #ifdef HAVE_SETSID
 773                 (void)setsid();
 774 #else
 775                 setpgrp(0, getpid());
 776 #endif
 777                 if (chdir("/") != 0)
 778                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 779                                      strerror(errno));
 780
 781                 /* Detach stdin, stdout and stderr */
 782                 Setup_FDStreams(fd);
 783                 if (fd > 2)
 784                         close(fd);
 785         }
 786         pid = getpid();
 787
 788         Pidfile_Create(pid);
 789
 790         /* Check UID/GID we are running as, can be different from values
 791          * configured (e. g. if we were already started with a UID>0. */
 792         Conf_UID = getuid();
 793         Conf_GID = getgid();
 794
 795         pwd = getpwuid(Conf_UID);
 796         grp = getgrgid(Conf_GID);
 797
 798         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 799             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 800             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 801
 802         if (chrooted) {
 803                 Log(LOG_INFO, "Running with root directory \"%s\".",
 804                     Conf_Chroot );
 805                 return true;
 806         } else
 807                 Log(LOG_INFO, "Not running with changed root directory.");
 808
 809         /* Change working directory to home directory of the user we are
 810          * running as (only when running in daemon mode and not in chroot) */
 811
 812         if (NGIRCd_NoDaemon)
 813                 return true;
 814
 815         if (pwd) {
 816                 if (chdir(pwd->pw_dir) == 0)
 817                         Log(LOG_DEBUG,
 818                             "Changed working directory to \"%s\" ...",
 819                             pwd->pw_dir);
 820                 else
 821                         Log(LOG_ERR,
 822                             "Can't change working directory to \"%s\": %s!",
 823                             pwd->pw_dir, strerror(errno));
 824         } else
 825                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 826
 827         return true;
 828  out:
 829         if (fd > 2)
 830                 close(fd);
 831         return false;
 832 } /* NGIRCd_Init */
 833
 834
 835 /* -eof- */