src/ngircd/ngircd.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2024 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
  96         Fill_Version();
  97
  98         /* parse conmmand line */
  99         for (i = 1; i < argc; i++) {
 100                 ok = false;
 101                 if (argv[i][0] == '-' && argv[i][1] == '-') {
 102                         /* long option */
 103                         if (strcmp(argv[i], "--config") == 0) {
 104                                 if (i + 1 < argc) {
 105                                         /* Ok, there's an parameter left */
 106                                         strlcpy(NGIRCd_ConfFile, argv[i+1],
 107                                                 sizeof(NGIRCd_ConfFile));
 108                                         /* next parameter */
 109                                         i++; ok = true;
 110                                 }
 111                         }
 112                         if (strcmp(argv[i], "--configtest") == 0) {
 113                                 configtest = true;
 114                                 ok = true;
 115                         }
 116                         if (strcmp(argv[i], "--debug") == 0) {
 117                                 NGIRCd_Debug = true;
 118                                 ok = true;
 119                         }
 120                         if (strcmp(argv[i], "--help") == 0) {
 121                                 Show_Version();
 122                                 puts(""); Show_Help( ); puts( "" );
 123                                 exit(0);
 124                         }
 125                         if (strcmp(argv[i], "--nodaemon") == 0) {
 126                                 NGIRCd_NoDaemon = true;
 127                                 NGIRCd_NoSyslog = true;
 128                                 ok = true;
 129                         }
 130                         if (strcmp(argv[i], "--passive") == 0) {
 131                                 NGIRCd_Passive = true;
 132                                 ok = true;
 133                         }
 134 #ifdef SNIFFER
 135                         if (strcmp(argv[i], "--sniffer") == 0) {
 136                                 NGIRCd_Sniffer = true;
 137                                 ok = true;
 138                         }
 139 #endif
 140 #ifdef SYSLOG
 141                         if (strcmp(argv[i], "--syslog") == 0) {
 142                                 NGIRCd_NoSyslog = false;
 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                                 if (argv[i][n] == 'd') {
 156                                         NGIRCd_Debug = true;
 157                                         ok = true;
 158                                 }
 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                                         NGIRCd_NoSyslog = true;
 181                                         ok = true;
 182                                 }
 183                                 if (argv[i][n] == 'p') {
 184                                         NGIRCd_Passive = true;
 185                                         ok = true;
 186                                 }
 187 #ifdef SNIFFER
 188                                 if (argv[i][n] == 's') {
 189                                         NGIRCd_Sniffer = true;
 190                                         ok = true;
 191                                 }
 192 #endif
 193                                 if (argv[i][n] == 't') {
 194                                         configtest = true;
 195                                         ok = true;
 196                                 }
 197
 198                                 if (argv[i][n] == 'V') {
 199                                         Show_Version();
 200                                         exit(1);
 201                                 }
 202 #ifdef SYSLOG
 203                                 if (argv[i][n] == 'y') {
 204                                         NGIRCd_NoSyslog = false;
 205                                         ok = true;
 206                                 }
 207 #endif
 208
 209                                 if (!ok) {
 210                                         fprintf(stderr,
 211                                                 "%s: invalid option \"-%c\"!\n",
 212                                                 PACKAGE_NAME, argv[i][n]);
 213                                         fprintf(stderr,
 214                                                 "Try \"%s --help\" for more information.\n",
 215                                                 PACKAGE_NAME);
 216                                         exit(2);
 217                                 }
 218                         }
 219
 220                 }
 221                 if (!ok) {
 222                         fprintf(stderr, "%s: invalid option \"%s\"!\n",
 223                                 PACKAGE_NAME, argv[i]);
 224                         fprintf(stderr, "Try \"%s --help\" for more information.\n",
 225                                 PACKAGE_NAME);
 226                         exit(2);
 227                 }
 228         }
 229
 230         /* Debug level for "VERSION" command */
 231         NGIRCd_DebugLevel[0] = '\0';
 232         if (NGIRCd_Debug)
 233                 strcpy(NGIRCd_DebugLevel, "1");
 234 #ifdef SNIFFER
 235         if (NGIRCd_Sniffer) {
 236                 NGIRCd_Debug = true;
 237                 strcpy(NGIRCd_DebugLevel, "2");
 238         }
 239 #endif
 240
 241         if (configtest) {
 242                 Show_Version(); puts("");
 243                 exit(Conf_Test());
 244         }
 245
 246         while (!NGIRCd_SignalQuit) {
 247                 /* Initialize global variables */
 248                 NGIRCd_Start = time(NULL);
 249                 (void)strftime(NGIRCd_StartStr, 64,
 250                                "%a %b %d %Y at %H:%M:%S (%Z)",
 251                                localtime(&NGIRCd_Start));
 252
 253                 NGIRCd_SignalRestart = false;
 254                 NGIRCd_SignalQuit = false;
 255
 256                 Log_Init(!NGIRCd_NoSyslog);
 257                 Random_Init();
 258                 Conf_Init();
 259                 Log_ReInit();
 260
 261                 /* Initialize the "main program":
 262                  * chroot environment, user and group ID, ... */
 263                 if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
 264                         Log(LOG_ALERT, "Fatal: Initialization failed, exiting!");
 265                         exit(1);
 266                 }
 267
 268                 if (!io_library_init(CONNECTION_POOL)) {
 269                         Log(LOG_ALERT,
 270                             "Fatal: Could not initialize IO routines: %s",
 271                             strerror(errno));
 272                         exit(1);
 273                 }
 274
 275                 if (!Signals_Init()) {
 276                         Log(LOG_ALERT,
 277                             "Fatal: Could not set up signal handlers: %s",
 278                             strerror(errno));
 279                         exit(1);
 280                 }
 281
 282                 Channel_Init();
 283                 Conn_Init();
 284                 Class_Init();
 285                 Client_Init();
 286
 287                 /* Create protocol and server identification. The syntax
 288                  * used by ngIRCd in PASS commands and the known "extended
 289                  * flags" are described in doc/Protocol.txt. */
 290 #ifdef IRCPLUS
 291                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s",
 292                          PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION,
 293                          IRCPLUSFLAGS);
 294 #ifdef ZLIB
 295                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 296 #endif
 297                 if (Conf_OperCanMode)
 298                         strlcat(NGIRCd_ProtoID, "o", sizeof NGIRCd_ProtoID);
 299 #else /* IRCPLUS */
 300                 snprintf(NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s",
 301                          PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION);
 302 #endif /* IRCPLUS */
 303                 strlcat(NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID);
 304 #ifdef ZLIB
 305                 strlcat(NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID);
 306 #endif
 307                 LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
 308
 309                 Channel_InitPredefined();
 310
 311                 if (Conn_InitListeners() < 1) {
 312                         Log(LOG_ALERT,
 313                             "Server isn't listening on a single port!" );
 314                         Log(LOG_ALERT,
 315                             "%s exiting due to fatal errors!", PACKAGE_NAME);
 316                         Pidfile_Delete();
 317                         exit(1);
 318                 }
 319
 320                 /* Main Run Loop */
 321                 Conn_Handler();
 322
 323                 Conn_Exit();
 324                 Client_Exit();
 325                 Channel_Exit();
 326                 Class_Exit();
 327                 Log_Exit();
 328                 Signals_Exit();
 329         }
 330         Pidfile_Delete();
 331
 332         return 0;
 333 } /* main */
 334
 335
 336 /**
 337  * Generate ngIRCd "version strings".
 338  *
 339  * The ngIRCd version information is generated once and then stored in the
 340  * NGIRCd_Version and NGIRCd_VersionAddition string variables for further
 341  * usage, for example by the IRC command "VERSION" and the --version command
 342  * line switch.
 343  */
 344 static void
 345 Fill_Version(void)
 346 {
 347         NGIRCd_VersionAddition[0] = '\0';
 348
 349 #ifdef ICONV
 350         if (NGIRCd_VersionAddition[0])
 351                 strlcat(NGIRCd_VersionAddition, "+",
 352                         sizeof NGIRCd_VersionAddition);
 353         strlcat(NGIRCd_VersionAddition, "CHARCONV",
 354                 sizeof NGIRCd_VersionAddition);
 355 #endif
 356 #ifdef DEBUG
 357         if (NGIRCd_VersionAddition[0])
 358                 strlcat(NGIRCd_VersionAddition, "+",
 359                         sizeof NGIRCd_VersionAddition);
 360         strlcat(NGIRCd_VersionAddition, "DEBUG",
 361                 sizeof NGIRCd_VersionAddition);
 362 #endif
 363 #ifdef IDENTAUTH
 364         if (NGIRCd_VersionAddition[0])
 365                 strlcat(NGIRCd_VersionAddition, "+",
 366                         sizeof NGIRCd_VersionAddition);
 367         strlcat(NGIRCd_VersionAddition, "IDENT",
 368                 sizeof NGIRCd_VersionAddition);
 369 #endif
 370 #ifdef WANT_IPV6
 371         if (NGIRCd_VersionAddition[0])
 372                 strlcat(NGIRCd_VersionAddition, "+",
 373                         sizeof(NGIRCd_VersionAddition));
 374         strlcat(NGIRCd_VersionAddition, "IPv6",
 375                 sizeof(NGIRCd_VersionAddition));
 376 #endif
 377 #ifdef IRCPLUS
 378         if (NGIRCd_VersionAddition[0])
 379                 strlcat(NGIRCd_VersionAddition, "+",
 380                         sizeof NGIRCd_VersionAddition);
 381         strlcat(NGIRCd_VersionAddition, "IRCPLUS",
 382                 sizeof NGIRCd_VersionAddition);
 383 #endif
 384 #ifdef PAM
 385         if (NGIRCd_VersionAddition[0])
 386                 strlcat(NGIRCd_VersionAddition, "+",
 387                         sizeof NGIRCd_VersionAddition);
 388         strlcat(NGIRCd_VersionAddition, "PAM",
 389                 sizeof NGIRCd_VersionAddition);
 390 #endif
 391 #ifdef STRICT_RFC
 392         if (NGIRCd_VersionAddition[0])
 393                 strlcat(NGIRCd_VersionAddition, "+",
 394                         sizeof NGIRCd_VersionAddition);
 395         strlcat(NGIRCd_VersionAddition, "RFC",
 396                 sizeof NGIRCd_VersionAddition);
 397 #endif
 398 #ifdef SNIFFER
 399         if (NGIRCd_VersionAddition[0])
 400                 strlcat(NGIRCd_VersionAddition, "+",
 401                         sizeof NGIRCd_VersionAddition);
 402         strlcat(NGIRCd_VersionAddition, "SNIFFER",
 403                 sizeof NGIRCd_VersionAddition);
 404 #endif
 405 #ifdef SSL_SUPPORT
 406         if (NGIRCd_VersionAddition[0])
 407                 strlcat(NGIRCd_VersionAddition, "+",
 408                         sizeof NGIRCd_VersionAddition);
 409         strlcat(NGIRCd_VersionAddition, "SSL",
 410                 sizeof NGIRCd_VersionAddition);
 411 #endif
 412 #ifdef SYSLOG
 413         if (NGIRCd_VersionAddition[0])
 414                 strlcat(NGIRCd_VersionAddition, "+",
 415                         sizeof NGIRCd_VersionAddition);
 416         strlcat(NGIRCd_VersionAddition, "SYSLOG",
 417                 sizeof NGIRCd_VersionAddition);
 418 #endif
 419 #ifdef TCPWRAP
 420         if (NGIRCd_VersionAddition[0])
 421                 strlcat(NGIRCd_VersionAddition, "+",
 422                         sizeof NGIRCd_VersionAddition);
 423         strlcat(NGIRCd_VersionAddition, "TCPWRAP",
 424                 sizeof NGIRCd_VersionAddition);
 425 #endif
 426 #ifdef ZLIB
 427         if (NGIRCd_VersionAddition[0])
 428                 strlcat(NGIRCd_VersionAddition, "+",
 429                         sizeof NGIRCd_VersionAddition);
 430         strlcat(NGIRCd_VersionAddition, "ZLIB",
 431                 sizeof NGIRCd_VersionAddition);
 432 #endif
 433         if (NGIRCd_VersionAddition[0])
 434                 strlcat(NGIRCd_VersionAddition, "-",
 435                         sizeof(NGIRCd_VersionAddition));
 436
 437         strlcat(NGIRCd_VersionAddition, HOST_CPU,
 438                 sizeof(NGIRCd_VersionAddition));
 439         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 440         strlcat(NGIRCd_VersionAddition, HOST_VENDOR,
 441                 sizeof(NGIRCd_VersionAddition));
 442         strlcat(NGIRCd_VersionAddition, "/", sizeof(NGIRCd_VersionAddition));
 443         strlcat(NGIRCd_VersionAddition, HOST_OS,
 444                 sizeof(NGIRCd_VersionAddition));
 445
 446         snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
 447                  PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
 448 } /* Fill_Version */
 449
 450
 451 /**
 452  * Display copyright and version information of ngIRCd on the console.
 453  */
 454 static void
 455 Show_Version( void )
 456 {
 457         puts( NGIRCd_Version );
 458         puts( "Copyright (c)2001-2024 Alexander Barton (<alex@barton.de>) and Contributors." );
 459         puts( "Homepage: <http://ngircd.barton.de/>\n" );
 460         puts( "This is free software; see the source for copying conditions. There is NO" );
 461         puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 462 } /* Show_Version */
 463
 464
 465 /**
 466  * Display a short help text on the console.
 467  * This help depends on the configuration of the executable and only shows
 468  * options that are actually enabled.
 469  */
 470 static void
 471 Show_Help( void )
 472 {
 473         puts( "  -d, --debug        log extra debug messages" );
 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 #ifdef SYSLOG
 483         puts( "  -y, --syslog       log to syslog even when running in the foreground (-n)" );
 484 #endif
 485         puts( "  -h, --help         display this help and exit" );
 486 } /* Show_Help */
 487
 488
 489 /**
 490  * Delete the file containing the process ID (PID).
 491  */
 492 static void
 493 Pidfile_Delete( void )
 494 {
 495         /* Pidfile configured? */
 496         if( ! Conf_PidFile[0] ) return;
 497
 498         LogDebug( "Removing PID file (%s) ...", Conf_PidFile );
 499
 500         if( unlink( Conf_PidFile ))
 501                 Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno ));
 502 } /* Pidfile_Delete */
 503
 504
 505 /**
 506  * Create the file containing the process ID of ngIRCd ("PID file").
 507  *
 508  * @param pid   The process ID to be stored in this file.
 509  */
 510 static void
 511 Pidfile_Create(pid_t pid)
 512 {
 513         int pidfd;
 514         char pidbuf[64];
 515         int len;
 516
 517         /* Pidfile configured? */
 518         if( ! Conf_PidFile[0] ) return;
 519
 520         LogDebug( "Creating PID file (%s) ...", Conf_PidFile );
 521
 522         pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 523         if ( pidfd < 0 ) {
 524                 Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 525                 return;
 526         }
 527
 528         len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
 529         if (len < 0 || len >= (int)sizeof pidbuf) {
 530                 Log(LOG_ERR, "Error converting process ID!");
 531                 close(pidfd);
 532                 return;
 533         }
 534
 535         if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 536                 Log(LOG_ERR, "Can't write PID file (%s): %s!", Conf_PidFile,
 537                     strerror(errno));
 538
 539         if (close(pidfd) != 0)
 540                 Log(LOG_ERR, "Error closing PID file (%s): %s!", Conf_PidFile,
 541                     strerror(errno));
 542 } /* Pidfile_Create */
 543
 544
 545 /**
 546  * Redirect stdin, stdout and stderr to appropriate file handles.
 547  *
 548  * @param fd    The file handle stdin, stdout and stderr should be redirected to.
 549  */
 550 static void
 551 Setup_FDStreams(int fd)
 552 {
 553         if (fd < 0)
 554                 return;
 555
 556         fflush(stdout);
 557         fflush(stderr);
 558
 559         /* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 560         dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
 561 } /* Setup_FDStreams */
 562
 563
 564 #if !defined(SINGLE_USER_OS)
 565
 566 /**
 567  * Get user and group ID of unprivileged "nobody" user.
 568  *
 569  * @param uid   User ID
 570  * @param gid   Group ID
 571  * @return      true on success.
 572  */
 573 static bool
 574 NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
 575 {
 576         struct passwd *pwd;
 577
 578 #ifdef __CYGWIN__
 579         /* Cygwin kludge.
 580          * It can return EINVAL instead of EPERM
 581          * so, if we are already unprivileged,
 582          * use id of current user.
 583          */
 584         if (geteuid() && getuid()) {
 585                 *uid = getuid();
 586                 *gid = getgid();
 587                 return true;
 588         }
 589 #endif
 590
 591         pwd = getpwnam("nobody");
 592         if (!pwd)
 593                 return false;
 594
 595         if (!pwd->pw_uid || !pwd->pw_gid)
 596                 return false;
 597
 598         *uid = pwd->pw_uid;
 599         *gid = pwd->pw_gid;
 600         endpwent();
 601
 602         return true;
 603 } /* NGIRCd_getNobodyID */
 604
 605 #endif
 606
 607
 608 #ifdef HAVE_ARC4RANDOM
 609 static void
 610 Random_Init(void)
 611 {
 612
 613 }
 614 #else
 615 static bool
 616 Random_Init_Kern(const char *file)
 617 {
 618         unsigned int seed;
 619         bool ret = false;
 620         int fd = open(file, O_RDONLY);
 621         if (fd >= 0) {
 622                 if (read(fd, &seed, sizeof(seed)) == sizeof(seed))
 623                         ret = true;
 624                 close(fd);
 625                 srand(seed);
 626         }
 627         return ret;
 628 }
 629
 630 /**
 631  * Initialize libc rand(3) number generator
 632  */
 633 static void
 634 Random_Init(void)
 635 {
 636         if (Random_Init_Kern("/dev/urandom"))
 637                 return;
 638         if (Random_Init_Kern("/dev/random"))
 639                 return;
 640         if (Random_Init_Kern("/dev/arandom"))
 641                 return;
 642         srand(rand() ^ (unsigned)getpid() ^ (unsigned)time(NULL));
 643 }
 644 #endif
 645
 646
 647 /**
 648  * Initialize ngIRCd daemon.
 649  *
 650  * @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
 651  *              foreground (and not as a daemon).
 652  * @return true on success.
 653  */
 654 static bool
 655 NGIRCd_Init(bool NGIRCd_NoDaemon)
 656 {
 657         static bool initialized;
 658         bool chrooted = false;
 659         struct passwd *pwd;
 660         struct group *grp;
 661         int real_errno, fd = -1;
 662         pid_t pid;
 663
 664         if (initialized)
 665                 return true;
 666
 667         if (!NGIRCd_NoDaemon) {
 668                 /* open /dev/null before chroot() */
 669                 fd = open( "/dev/null", O_RDWR);
 670                 if (fd < 0)
 671                         Log(LOG_WARNING, "Could not open /dev/null: %s",
 672                             strerror(errno));
 673         }
 674
 675         /* SSL initialization */
 676         if (!ConnSSL_InitLibrary()) {
 677                 Log(LOG_ERR, "Error during SSL initialization!");
 678                 goto out;
 679         }
 680
 681         /* Change root */
 682         if (Conf_Chroot[0]) {
 683                 if (chdir(Conf_Chroot) != 0) {
 684                         Log(LOG_ERR, "Can't chdir() in ChrootDir (%s): %s!",
 685                             Conf_Chroot, strerror(errno));
 686                         goto out;
 687                 }
 688
 689                 if (chroot(Conf_Chroot) != 0) {
 690                         Log(LOG_ERR,
 691                             "Can't change root directory to \"%s\": %s!",
 692                             Conf_Chroot, strerror(errno));
 693                         goto out;
 694                 } else {
 695                         chrooted = true;
 696                         Log(LOG_INFO,
 697                             "Changed root and working directory to \"%s\".",
 698                             Conf_Chroot);
 699                 }
 700         }
 701
 702 #if !defined(SINGLE_USER_OS)
 703         /* Check user ID */
 704         if (Conf_UID == 0) {
 705                 pwd = getpwuid(0);
 706                 Log(LOG_INFO,
 707                     "ServerUID must not be %s(0), using \"nobody\" instead.",
 708                     pwd ? pwd->pw_name : "?");
 709                 if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
 710                         Log(LOG_WARNING,
 711                             "Could not get user/group ID of user \"nobody\": %s",
 712                             errno ? strerror(errno) : "not found" );
 713                         goto out;
 714                 }
 715         }
 716
 717         /* Change group ID */
 718         if (getgid() != Conf_GID) {
 719                 if (setgid(Conf_GID) != 0) {
 720                         real_errno = errno;
 721                         grp = getgrgid(Conf_GID);
 722                         Log(LOG_ERR, "Can't change group ID to %s(%u): %s!",
 723                             grp ? grp->gr_name : "?", Conf_GID,
 724                             strerror(real_errno));
 725                         if (real_errno != EPERM && real_errno != EINVAL)
 726                                 goto out;
 727                 }
 728 #ifdef HAVE_SETGROUPS
 729                 if (setgroups(0, NULL) != 0) {
 730                         real_errno = errno;
 731                         Log(LOG_ERR, "Can't drop supplementary group IDs: %s!",
 732                                         strerror(errno));
 733                         if (real_errno != EPERM)
 734                                 goto out;
 735                 }
 736 #else
 737                 Log(LOG_WARNING,
 738                     "Can't drop supplementary group IDs: setgroups(3) missing!");
 739 #endif
 740         }
 741 #endif
 742
 743         /* Change user ID */
 744         if (getuid() != Conf_UID) {
 745                 if (setuid(Conf_UID) != 0) {
 746                         real_errno = errno;
 747                         pwd = getpwuid(Conf_UID);
 748                         Log(LOG_ERR, "Can't change user ID to %s(%u): %s!",
 749                             pwd ? pwd->pw_name : "?", Conf_UID,
 750                             strerror(real_errno));
 751                         if (real_errno != EPERM && real_errno != EINVAL)
 752                                 goto out;
 753                 }
 754         }
 755
 756         initialized = true;
 757
 758         /* Normally a child process is forked which isn't any longer
 759          * connected to the controlling terminal. Use "--nodaemon"
 760          * to disable this "daemon mode" (useful for debugging). */
 761         if (!NGIRCd_NoDaemon) {
 762                 pid = fork();
 763                 if (pid > 0) {
 764                         /* "Old" process: exit. */
 765                         exit(0);
 766                 }
 767                 if (pid < 0) {
 768                         /* Error!? */
 769                         fprintf(stderr,
 770                                 "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
 771                                 PACKAGE_NAME, strerror(errno));
 772                         exit(1);
 773                 }
 774
 775                 /* New child process */
 776 #ifdef HAVE_SETSID
 777                 (void)setsid();
 778 #else
 779                 setpgrp(0, getpid());
 780 #endif
 781                 if (chdir("/") != 0)
 782                         Log(LOG_ERR, "Can't change directory to '/': %s!",
 783                                      strerror(errno));
 784
 785                 /* Detach stdin, stdout and stderr */
 786                 Setup_FDStreams(fd);
 787                 if (fd > 2)
 788                         close(fd);
 789         }
 790         pid = getpid();
 791
 792         Pidfile_Create(pid);
 793
 794         /* Check UID/GID we are running as, can be different from values
 795          * configured (e. g. if we were already started with a UID>0. */
 796         Conf_UID = getuid();
 797         Conf_GID = getgid();
 798
 799         pwd = getpwuid(Conf_UID);
 800         grp = getgrgid(Conf_GID);
 801
 802         Log(LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
 803             pwd ? pwd->pw_name : "unknown", (long)Conf_UID,
 804             grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
 805
 806         if (chrooted) {
 807                 Log(LOG_INFO, "Running with root directory \"%s\".",
 808                     Conf_Chroot );
 809                 return true;
 810         } else
 811                 Log(LOG_INFO, "Not running with changed root directory.");
 812
 813         /* Change working directory to home directory of the user we are
 814          * running as (only when running in daemon mode and not in chroot) */
 815
 816         if (NGIRCd_NoDaemon)
 817                 return true;
 818
 819         if (pwd) {
 820                 if (chdir(pwd->pw_dir) == 0)
 821                         LogDebug(
 822                             "Changed working directory to \"%s\" ...",
 823                             pwd->pw_dir);
 824                 else
 825                         Log(LOG_ERR,
 826                             "Can't change working directory to \"%s\": %s!",
 827                             pwd->pw_dir, strerror(errno));
 828         } else
 829                 Log(LOG_ERR, "Can't get user information for UID %d!?", Conf_UID);
 830
 831         return true;
 832  out:
 833         if (fd > 2)
 834                 close(fd);
 835         return false;
 836 } /* NGIRCd_Init */
 837
 838
 839 /* -eof- */