src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2023 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #define GLOBAL_INIT
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * The main program, including the C function main() which is called
  18  * by the loader of the operating system.
  19  */
  20
  21 #include <assert.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <time.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <pwd.h>
  32 #include <grp.h>
  33
  34 #if defined(DEBUG) && defined(HAVE_MTRACE)
  35 #include <mcheck.h>
  36 #endif
  37
  38 #include "conn.h"
  39 #include "class.h"
  40 #include "channel.h"
  41 #include "conf.h"
  42 #include "log.h"
  43 #include "sighandlers.h"
  44 #include "io.h"
  45
  46 #include "ngircd.h"
  47
  48 static void Show_Version PARAMS(( void ));
  49 static void Show_Help PARAMS(( void ));
  50
  51 static void Pidfile_Create PARAMS(( pid_t pid ));
  52 static void Pidfile_Delete PARAMS(( void ));
  53
  54 static void Fill_Version PARAMS(( void ));
  55
  56 static void Random_Init PARAMS(( void ));
  57
  58 static void Setup_FDStreams PARAMS(( int fd ));
  59
  60 static bool NGIRCd_Init PARAMS(( bool ));
  61
  62
  63 /**
  64  * The main() function of ngIRCd.
  65  *
  66  * Here all starts: this function is called by the operating system loader,
  67  * it is the first portion of code executed of ngIRCd.
  68  *
  69  * @param argc The number of arguments passed to ngIRCd on the command line.
  70  * @param argv An array containing all the arguments passed to ngIRCd.
  71  * @return Global exit code of ngIRCd, zero on success.
  72  */
  73 GLOBAL int
  74 main(int argc, const char *argv[])
  75 {
  76         bool ok, configtest = false;
  77         bool NGIRCd_NoDaemon = false, 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         NGIRCd_Debug = false;
  92 #ifdef SNIFFER
  93         NGIRCd_Sniffer = false;
  94 #endif
  95         strlcpy(NGIRCd_ConfFile, SYSCONFDIR, sizeof(NGIRCd_ConfFile));
  96         strlcat(NGIRCd_ConfFile, CONFIG_FILE, sizeof(NGIRCd_ConfFile));
  97
  98         Fill_Version();
  99
 100         /* parse conmmand line */
 101         for (i = 1; i < argc; i++) {
 102                 ok = false;
 103                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 104                         /* long option */
 105                         if (strcmp(argv[i], "--config") == 0) {
 106                                 if (i + 1 < argc) {
 107                                         /* Ok, there's an parameter left */
 108                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 109                                                 sizeof(NGIRCd_ConfFile));
 110                                         /* next parameter */
 111                                         i++; ok = true;
 112                                 }
 113                         }
 114                         if (strcmp(argv[i], "--configtest") == 0) {
 115                                 configtest = true;
 116                                 ok = true;
 117                         }
 118                         if (strcmp(argv[i], "--debug") == 0) {
 119                                 NGIRCd_Debug = true;
 120                                 ok = true;
 121                         }
 122                         if (strcmp(argv[i], "--help") == 0) {
 123                                 Show_Version();
 124                                 puts(""); Show_Help( ); puts( "" );
 125                                 exit(0);
 126                         }
 127                         if (strcmp(argv[i], "--nodaemon") == 0) {
 128                                 NGIRCd_NoDaemon = true;
 129                                 NGIRCd_NoSyslog = true;
 130                                 ok = true;
 131                         }
 132                         if (strcmp(argv[i], "--passive") == 0) {
 133                                 NGIRCd_Passive = true;
 134                                 ok = true;
 135                         }
 136 #ifdef SNIFFER
 137                         if (strcmp(argv[i], "--sniffer") == 0) {
 138                                 NGIRCd_Sniffer = true;
 139                                 ok = true;
 140                         }
 141 #endif
 142 #ifdef SYSLOG
 143                         if (strcmp(argv[i], "--syslog") == 0) {
 144                                 NGIRCd_NoSyslog = false;
 145                                 ok = true;
 146                         }
 147 #endif
 148                         if (strcmp(argv[i], "--version") == 0) {
 149                                 Show_Version();
 150                                 exit(0);
 151                         }
 152                 }
 153                 else if(argv[i][0] == '-' && argv[i][1] != '-') {
 154                         /* short option */
 155                         for (n = 1; n < strlen(argv[i]); n++) {
 156                                 ok = false;
 157                                 if (argv[i][n] == 'd') {
 158                                         NGIRCd_Debug = true;
 159                                         ok = true;
 160                                 }
 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 #ifdef SYSLOG
 205                                 if (argv[i][n] == 'y') {
 206                                         NGIRCd_NoSyslog = false;
 207                                         ok = true;
 208                                 }
 209 #endif
 210
 211                                 if (!ok) {
 212                                         fprintf(stderr,
 213                                                 "%s: invalid option \"-%c\"!\n",
 214                                                 PACKAGE_NAME, argv[i][n]);
 215                                         fprintf(stderr,
 216                                                 "Try \"%s --help\" for more information.\n",
 217                                                 PACKAGE_NAME);
 218                                         exit(2);
 219                                 }
 220                         }
 221
 222                 }
 223                 if (!ok) {
 224                         fprintf(stderr, "%s: invalid option \"%s\"!\n",
 225                                 PACKAGE_NAME, argv[i]);
 226                         fprintf(stderr, "Try \"%s --help\" for more information.\n",
 227                                 PACKAGE_NAME);
 228                         exit(2);
 229                 }
 230         }
 231
 232         /* Debug level for "VERSION" command */
 233         NGIRCd_DebugLevel[0] = '\0';
 234         if (NGIRCd_Debug)
 235                 strcpy(NGIRCd_DebugLevel, "1");
 236 #ifdef SNIFFER
 237         if (NGIRCd_Sniffer) {
 238                 NGIRCd_Debug = true;
 239                 strcpy(NGIRCd_DebugLevel, "2");
 240         }
 241 #endif
 242
 243         if (configtest) {
 244                 Show_Version(); puts("");
 245                 exit(Conf_Test());
 246         }
 247
 248         while (!NGIRCd_SignalQuit) {
 249                 /* Initialize global variables */
 250                 NGIRCd_Start = time(NULL);
 251                 (void)strftime(NGIRCd_StartStr, 64,
 252                                "%a %b %d %Y at %H:%M:%S (%Z)",
 253                                localtime(&NGIRCd_Start));
 254
 255                 NGIRCd_SignalRestart = false;
 256                 NGIRCd_SignalQuit = false;
 257
 258                 Log_Init(!NGIRCd_NoSyslog);
 259                 Random_Init();
 260                 Conf_Init();
 261                 Log_ReInit();
 262
 263                 /* Initialize the "main program":
 264                  * chroot environment, user and group ID, ... */
 265                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 266                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 267                         exit(1);
 268                 }
 269
 270                 if (!io_library_init(CONNECTION_POOL)) {
 271                         Log(LOG_ALERT,
 272                             "Fatal: Could not initialize IO routines: %s",
 273                             strerror(errno));
 274                         exit(1);
 275                 }
 276
 277                 if (!Signals_Init()) {
 278                         Log(LOG_ALERT,
 279                             "Fatal: Could not set up signal handlers: %s",
 280                             strerror(errno));
 281                         exit(1);
 282                 }
 283
 284                 Channel_Init();
 285                 Conn_Init();
 286                 Class_Init();
 287                 Client_Init();
 288
 289                 /* Create protocol and server identification. The syntax
 290                  * used by ngIRCd in PASS commands and the known "extended
 291                  * flags" are described in doc/Protocol.txt. */
 292 #ifdef IRCPLUS
 293                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 294                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 295                          IRCPLUSFLAGS);
 296 #ifdef ZLIB
 297                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 298 #endif
 299                 if (Conf_OperCanMode)
 300                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 301 #else /* IRCPLUS */
 302                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 303                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 304 #endif /* IRCPLUS */
 305                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 306 #ifdef ZLIB
 307                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 308 #endif
 309                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 310
 311                 Channel_InitPredefined();
 312
 313                 if (Conn_InitListeners() < 1) {
 314                         Log(LOG_ALERT,
 315                             "Server isn't listening on a single port!" );
 316                         Log(LOG_ALERT,
 317                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 318                         Pidfile_Delete();
 319                         exit(1);
 320                 }
 321
 322                 /* Main Run Loop */
 323                 Conn_Handler();
 324
 325                 Conn_Exit();
 326                 Client_Exit();
 327                 Channel_Exit();
 328                 Class_Exit();
 329                 Log_Exit();
 330                 Signals_Exit();
 331         }
 332         Pidfile_Delete();
 333
 334         return 0;
 335 } /* main */
 336
 337
 338 /**
 339  * Generate ngIRCd "version strings".
 340  *
 341  * The ngIRCd version information is generated once and then stored in the
 342  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 343  * usage, for example by the IRC command "VERSION" and the --version command
 344  * line switch.
 345  */
 346 static void
 347 Fill_Version(void)
 348 {
 349         NGIRCd_VersionAddition[0] = '\0';
 350
 351 #ifdef ICONV
 352         if (NGIRCd_VersionAddition[0])
 353                 strlcat(NGIRCd_VersionAddition, "+",
 354                         sizeof NGIRCd_VersionAddition);
 355         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 356                 sizeof NGIRCd_VersionAddition);
 357 #endif
 358 #ifdef DEBUG
 359         if (NGIRCd_VersionAddition[0])
 360                 strlcat(NGIRCd_VersionAddition, "+",
 361                         sizeof NGIRCd_VersionAddition);
 362         strlcat(NGIRCd_VersionAddition, "DEBUG",
 363                 sizeof NGIRCd_VersionAddition);
 364 #endif
 365 #ifdef IDENTAUTH
 366         if (NGIRCd_VersionAddition[0])
 367                 strlcat(NGIRCd_VersionAddition, "+",
 368                         sizeof NGIRCd_VersionAddition);
 369         strlcat(NGIRCd_VersionAddition, "IDENT",
 370                 sizeof NGIRCd_VersionAddition);
 371 #endif
 372 #ifdef WANT_IPV6
 373         if (NGIRCd_VersionAddition[0])
 374                 strlcat(NGIRCd_VersionAddition, "+",
 375                         sizeof(NGIRCd_VersionAddition));
 376         strlcat(NGIRCd_VersionAddition, "IPv6",
 377                 sizeof(NGIRCd_VersionAddition));
 378 #endif
 379 #ifdef IRCPLUS
 380         if (NGIRCd_VersionAddition[0])
 381                 strlcat(NGIRCd_VersionAddition, "+",
 382                         sizeof NGIRCd_VersionAddition);
 383         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 384                 sizeof NGIRCd_VersionAddition);
 385 #endif
 386 #ifdef PAM
 387         if (NGIRCd_VersionAddition[0])
 388                 strlcat(NGIRCd_VersionAddition, "+",
 389                         sizeof NGIRCd_VersionAddition);
 390         strlcat(NGIRCd_VersionAddition, "PAM",
 391                 sizeof NGIRCd_VersionAddition);
 392 #endif
 393 #ifdef STRICT_RFC
 394         if (NGIRCd_VersionAddition[0])
 395                 strlcat(NGIRCd_VersionAddition, "+",
 396                         sizeof NGIRCd_VersionAddition);
 397         strlcat(NGIRCd_VersionAddition, "RFC",
 398                 sizeof NGIRCd_VersionAddition);
 399 #endif
 400 #ifdef SNIFFER
 401         if (NGIRCd_VersionAddition[0])
 402                 strlcat(NGIRCd_VersionAddition, "+",
 403                         sizeof NGIRCd_VersionAddition);
 404         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 405                 sizeof NGIRCd_VersionAddition);
 406 #endif
 407 #ifdef SSL_SUPPORT
 408         if (NGIRCd_VersionAddition[0])
 409                 strlcat(NGIRCd_VersionAddition, "+",
 410                         sizeof NGIRCd_VersionAddition);
 411         strlcat(NGIRCd_VersionAddition, "SSL",
 412                 sizeof NGIRCd_VersionAddition);
 413 #endif
 414 #ifdef SYSLOG
 415         if (NGIRCd_VersionAddition[0])
 416                 strlcat(NGIRCd_VersionAddition, "+",
 417                         sizeof NGIRCd_VersionAddition);
 418         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 419                 sizeof NGIRCd_VersionAddition);
 420 #endif
 421 #ifdef TCPWRAP
 422         if (NGIRCd_VersionAddition[0])
 423                 strlcat(NGIRCd_VersionAddition, "+",
 424                         sizeof NGIRCd_VersionAddition);
 425         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 426                 sizeof NGIRCd_VersionAddition);
 427 #endif
 428 #ifdef ZLIB
 429         if (NGIRCd_VersionAddition[0])
 430                 strlcat(NGIRCd_VersionAddition, "+",
 431                         sizeof NGIRCd_VersionAddition);
 432         strlcat(NGIRCd_VersionAddition, "ZLIB",
 433                 sizeof NGIRCd_VersionAddition);
 434 #endif
 435         if (NGIRCd_VersionAddition[0])
 436                 strlcat(NGIRCd_VersionAddition, "-",
 437                         sizeof(NGIRCd_VersionAddition));
 438
 439         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 440                 sizeof(NGIRCd_VersionAddition));
 441         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 442         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 443                 sizeof(NGIRCd_VersionAddition));
 444         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 445         strlcat(NGIRCd_VersionAddition, HOST_OS,
 446                 sizeof(NGIRCd_VersionAddition));
 447
 448         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 449                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 450 } /* Fill_Version */
 451
 452
 453 /**
 454  * Display copyright and version information of ngIRCd on the console.
 455  */
 456 static void
 457 Show_Version( void )
 458 {
 459         puts( NGIRCd_Version );
 460         puts( "Copyright (c)2001-2023 Alexander Barton (<alex@barton.de>) and Contributors." );
 461         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 462         puts( "This is free software; see the source for copying conditions. There is NO" );
 463         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 464 } /* Show_Version */
 465
 466
 467 /**
 468  * Display a short help text on the console.
 469  * This help depends on the configuration of the executable and only shows
 470  * options that are actually enabled.
 471  */
 472 static void
 473 Show_Help( void )
 474 {
 475         puts( "  -d, --debug        log extra debug messages" );
 476         puts( "  -f, --config <f>   use file <f> as configuration file" );
 477         puts( "  -n, --nodaemon     don't fork and don't detach from controlling terminal" );
 478         puts( "  -p, --passive      disable automatic connections to other servers" );
 479 #ifdef SNIFFER
 480         puts( "  -s, --sniffer      enable network sniffer and display all IRC traffic" );
 481 #endif
 482         puts( "  -t, --configtest   read, validate and display configuration; then exit" );
 483         puts( "  -V, --version      output version information and exit" );
 484 #ifdef SYSLOG
 485         puts( "  -y, --syslog       log to syslog even when running in the foreground (-n)" );
 486 #endif
 487         puts( "  -h, --help         display this help and exit" );
 488 } /* Show_Help */
 489
 490
 491 /**
 492  * Delete the file containing the process ID (PID).
 493  */
 494 static void
 495 Pidfile_Delete( void )
 496 {
 497         /* Pidfile configured? */
 498         if( ! Conf_PidFile[0] ) return;
 499
 500         LogDebug( "Removing PID file (%s) ...", Conf_PidFile );
 501
 502         if( unlink( Conf_PidFile ))
 503                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 504 } /* Pidfile_Delete */
 505
 506
 507 /**
 508  * Create the file containing the process ID of ngIRCd ("PID file").
 509  *
 510  * @param pid   The process ID to be stored in this file.
 511  */
 512 static void
 513 Pidfile_Create(pid_t pid)
 514 {
 515         int pidfd;
 516         char pidbuf[64];
 517         int len;
 518
 519         /* Pidfile configured? */
 520         if( ! Conf_PidFile[0] ) return;
 521
 522         LogDebug( "Creating PID file (%s) ...", Conf_PidFile );
 523
 524         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 525         if ( pidfd < 0 ) {
 526                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 527                 return;
 528         }
 529
 530         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 531         if (len < 0 || len >= (int)sizeof pidbuf) {
 532                 Log(LOG_ERR, "Error converting process ID!");
 533                 close(pidfd);
 534                 return;
 535         }
 536
 537         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 538                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 539                     strerror(errno));
 540
 541         if (close(pidfd) != 0)
 542                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 543                     strerror(errno));
 544 } /* Pidfile_Create */
 545
 546
 547 /**
 548  * Redirect stdin, stdout and stderr to appropriate file handles.
 549  *
 550  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 551  */
 552 static void
 553 Setup_FDStreams(int fd)
 554 {
 555         if (fd < 0)
 556                 return;
 557
 558         fflush(stdout);
 559         fflush(stderr);
 560
 561         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 562         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 563 } /* Setup_FDStreams */
 564
 565
 566 #if !defined(SINGLE_USER_OS)
 567
 568 /**
 569  * Get user and group ID of unprivileged "nobody" user.
 570  *
 571  * @param uid   User ID
 572  * @param gid   Group ID
 573  * @return      true on success.
 574  */
 575 static bool
 576 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 577 {
 578         struct passwd *pwd;
 579
 580 #ifdef __CYGWIN__
 581         /* Cygwin kludge.
 582          * It can return EINVAL instead of EPERM
 583          * so, if we are already unprivileged,
 584          * use id of current user.
 585          */
 586         if (geteuid() && getuid()) {
 587                 *uid = getuid();
 588                 *gid = getgid();
 589                 return true;
 590         }
 591 #endif
 592
 593         pwd = getpwnam("nobody");
 594         if (!pwd)
 595                 return false;
 596
 597         if (!pwd->pw_uid || !pwd->pw_gid)
 598                 return false;
 599
 600         *uid = pwd->pw_uid;
 601         *gid = pwd->pw_gid;
 602         endpwent();
 603
 604         return true;
 605 } /* NGIRCd_getNobodyID */
 606
 607 #endif
 608
 609
 610 #ifdef HAVE_ARC4RANDOM
 611 static void
 612 Random_Init(void)
 613 {
 614
 615 }
 616 #else
 617 static bool
 618 Random_Init_Kern(const char *file)
 619 {
 620         unsigned int seed;
 621         bool ret = false;
 622         int fd = open(file, O_RDONLY);
 623         if (fd >= 0) {
 624                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 625                         ret = true;
 626                 close(fd);
 627                 srand(seed);
 628         }
 629         return ret;
 630 }
 631
 632 /**
 633  * Initialize libc rand(3) number generator
 634  */
 635 static void
 636 Random_Init(void)
 637 {
 638         if (Random_Init_Kern("/dev/urandom"))
 639                 return;
 640         if (Random_Init_Kern("/dev/random"))
 641                 return;
 642         if (Random_Init_Kern("/dev/arandom"))
 643                 return;
 644         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 645 }
 646 #endif
 647
 648
 649 /**
 650  * Initialize ngIRCd daemon.
 651  *
 652  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 653  *              foreground (and not as a daemon).
 654  * @return true on success.
 655  */
 656 static bool
 657 NGIRCd_Init(bool NGIRCd_NoDaemon)
 658 {
 659         static bool initialized;
 660         bool chrooted = false;
 661         struct passwd *pwd;
 662         struct group *grp;
 663         int real_errno, fd = -1;
 664         pid_t pid;
 665
 666         if (initialized)
 667                 return true;
 668
 669         if (!NGIRCd_NoDaemon) {
 670                 /* open /dev/null before chroot() */
 671                 fd = open( "/dev/null", O_RDWR);
 672                 if (fd < 0)
 673                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 674                             strerror(errno));
 675         }
 676
 677         /* SSL initialization */
 678         if (!ConnSSL_InitLibrary()) {
 679                 Log(LOG_ERR, "Error during SSL initialization!");
 680                 goto out;
 681         }
 682
 683         /* Change root */
 684         if (Conf_Chroot[0]) {
 685                 if (chdir(Conf_Chroot) != 0) {
 686                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 687                             Conf_Chroot, strerror(errno));
 688                         goto out;
 689                 }
 690
 691                 if (chroot(Conf_Chroot) != 0) {
 692                         Log(LOG_ERR,
 693                             "Can't change root directory to \"%s\": %s!",
 694                             Conf_Chroot, strerror(errno));
 695                         goto out;
 696                 } else {
 697                         chrooted = true;
 698                         Log(LOG_INFO,
 699                             "Changed root and working directory to \"%s\".",
 700                             Conf_Chroot);
 701                 }
 702         }
 703
 704 #if !defined(SINGLE_USER_OS)
 705         /* Check user ID */
 706         if (Conf_UID == 0) {
 707                 pwd = getpwuid(0);
 708                 Log(LOG_INFO,
 709                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 710                     pwd ? pwd->pw_name : "?");
 711                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 712                         Log(LOG_WARNING,
 713                             "Could not get user/group ID of user \"nobody\": %s",
 714                             errno ? strerror(errno) : "not found" );
 715                         goto out;
 716                 }
 717         }
 718
 719         /* Change group ID */
 720         if (getgid() != Conf_GID) {
 721                 if (setgid(Conf_GID) != 0) {
 722                         real_errno = errno;
 723                         grp = getgrgid(Conf_GID);
 724                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 725                             grp ? grp->gr_name : "?", Conf_GID,
 726                             strerror(real_errno));
 727                         if (real_errno != EPERM)
 728                                 goto out;
 729                 }
 730 #ifdef HAVE_SETGROUPS
 731                 if (setgroups(0, NULL) != 0) {
 732                         real_errno = errno;
 733                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 734                                         strerror(errno));
 735                         if (real_errno != EPERM)
 736                                 goto out;
 737                 }
 738 #else
 739                 Log(LOG_WARNING,
 740                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 741 #endif
 742         }
 743 #endif
 744
 745         /* Change user ID */
 746         if (getuid() != Conf_UID) {
 747                 if (setuid(Conf_UID) != 0) {
 748                         real_errno = errno;
 749                         pwd = getpwuid(Conf_UID);
 750                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 751                             pwd ? pwd->pw_name : "?", Conf_UID,
 752                             strerror(real_errno));
 753                         if (real_errno != EPERM)
 754                                 goto out;
 755                 }
 756         }
 757
 758         initialized = true;
 759
 760         /* Normally a child process is forked which isn't any longer
 761          * connected to ther controlling terminal. Use "--nodaemon"
 762          * to disable this "daemon mode" (useful for debugging). */
 763         if (!NGIRCd_NoDaemon) {
 764                 pid = fork();
 765                 if (pid > 0) {
 766                         /* "Old" process: exit. */
 767                         exit(0);
 768                 }
 769                 if (pid < 0) {
 770                         /* Error!? */
 771                         fprintf(stderr,
 772                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 773                                 PACKAGE_NAME, strerror(errno));
 774                         exit(1);
 775                 }
 776
 777                 /* New child process */
 778 #ifdef HAVE_SETSID
 779                 (void)setsid();
 780 #else
 781                 setpgrp(0, getpid());
 782 #endif
 783                 if (chdir("/") != 0)
 784                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 785                                      strerror(errno));
 786
 787                 /* Detach stdin, stdout and stderr */
 788                 Setup_FDStreams(fd);
 789                 if (fd > 2)
 790                         close(fd);
 791         }
 792         pid = getpid();
 793
 794         Pidfile_Create(pid);
 795
 796         /* Check UID/GID we are running as, can be different from values
 797          * configured (e. g. if we were already started with a UID>0. */
 798         Conf_UID = getuid();
 799         Conf_GID = getgid();
 800
 801         pwd = getpwuid(Conf_UID);
 802         grp = getgrgid(Conf_GID);
 803
 804         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 805             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 806             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 807
 808         if (chrooted) {
 809                 Log(LOG_INFO, "Running with root directory \"%s\".",
 810                     Conf_Chroot );
 811                 return true;
 812         } else
 813                 Log(LOG_INFO, "Not running with changed root directory.");
 814
 815         /* Change working directory to home directory of the user we are
 816          * running as (only when running in daemon mode and not in chroot) */
 817
 818         if (NGIRCd_NoDaemon)
 819                 return true;
 820
 821         if (pwd) {
 822                 if (chdir(pwd->pw_dir) == 0)
 823                         LogDebug(
 824                             "Changed working directory to \"%s\" ...",
 825                             pwd->pw_dir);
 826                 else
 827                         Log(LOG_ERR,
 828                             "Can't change working directory to \"%s\": %s!",
 829                             pwd->pw_dir, strerror(errno));
 830         } else
 831                 Log(LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID);
 832
 833         return true;
 834  out:
 835         if (fd > 2)
 836                 close(fd);
 837         return false;
 838 } /* NGIRCd_Init */
 839
 840
 841 /* -eof- */