src/ircd.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  ircd.c: Starts up and runs the ircd.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  */
  24
  25 #include "stdinc.h"
  26 #include "setup.h"
  27 #include "config.h"
  28
  29 #include "tools.h"
  30 #include "ircd.h"
  31 #include "channel.h"
  32 #include "class.h"
  33 #include "client.h"
  34 #include "common.h"
  35 #include "event.h"
  36 #include "hash.h"
  37 #include "irc_string.h"
  38 #include "ircd_signal.h"
  39 #include "sprintf_irc.h"
  40 #include "msg.h"                /* msgtab */
  41 #include "hostmask.h"
  42 #include "numeric.h"
  43 #include "parse.h"
  44 #include "res.h"
  45 #include "restart.h"
  46 #include "s_auth.h"
  47 #include "commio.h"
  48 #include "s_conf.h"
  49 #include "s_log.h"
  50 #include "s_serv.h"             /* try_connections */
  51 #include "s_user.h"
  52 #include "s_stats.h"
  53 #include "scache.h"
  54 #include "send.h"
  55 #include "supported.h"
  56 #include "whowas.h"
  57 #include "modules.h"
  58 #include "memory.h"
  59 #include "hook.h"
  60 #include "ircd_getopt.h"
  61 #include "balloc.h"
  62 #include "newconf.h"
  63 #include "patricia.h"
  64 #include "reject.h"
  65 #include "s_conf.h"
  66 #include "s_newconf.h"
  67 #include "cache.h"
  68 #include "monitor.h"
  69 #include "libseven.h"
  70 #include "patchlevel.h"
  71 #include "serno.h"
  72
  73 /*
  74  * Try and find the correct name to use with getrlimit() for setting the max.
  75  * number of files allowed to be open by this process.
  76  */
  77 int _seven_data_version = SEVEN_DV;
  78
  79 extern int ServerRunning, initialVMTop;
  80 extern struct LocalUser meLocalUser;
  81 extern char **myargv;
  82
  83 /*
  84  * get_vm_top - get the operating systems notion of the resident set size
  85  */
  86 static unsigned long
  87 get_vm_top(void)
  88 {
  89         /*
  90          * NOTE: sbrk is not part of the ANSI C library or the POSIX.1 standard
  91          * however it seems that everyone defines it. Calling sbrk with a 0
  92          * argument will return a pointer to the top of the process virtual
  93          * memory without changing the process size, so this call should be
  94          * reasonably safe (sbrk returns the new value for the top of memory).
  95          * This code relies on the notion that the address returned will be an
  96          * offset from 0 (NULL), so the result of sbrk is cast to a size_t and
  97          * returned. We really shouldn't be using it here but...
  98          */
  99         void *vptr = sbrk(0);
 100         return (unsigned long) vptr;
 101 }
 102
 103 /*
 104  * get_maxrss - get the operating systems notion of the resident set size
 105  */
 106 unsigned long
 107 get_maxrss(void)
 108 {
 109         return get_vm_top() - initialVMTop;
 110 }
 111
 112 /*
 113  * print_startup - print startup information
 114  */
 115 static void
 116 print_startup(int pid)
 117 {
 118         inotice("now running in %s mode from %s as pid %d ...",
 119                !server_state_foreground ? "background" : "foreground",
 120                 ConfigFileEntry.dpath, pid);
 121
 122         /* let the parent process know the initialization was successful
 123          * -- jilles */
 124         if (!server_state_foreground)
 125                 write(0, ".", 1);
 126         fclose(stdin);
 127         fclose(stdout);
 128         fclose(stderr);
 129         open("/dev/null", O_RDWR);
 130         dup2(0, 1);
 131         dup2(0, 2);
 132 }
 133
 134 static void
 135 ircd_log_cb(const char *str)
 136 {
 137         ilog(L_MAIN, "%s", str);
 138 }
 139
 140 /*
 141  * Why EXIT_FAILURE here?
 142  * Because if ircd_die_cb() is called it's because of a fatal
 143  * error inside libseven, and we don't know how to handle the
 144  * exception, so it is logical to return a FAILURE exit code here.
 145  *    --nenolod
 146  */
 147 static void
 148 ircd_die_cb(const char *str)
 149 {
 150         /* Try to get the message out to currently logged in operators. */
 151         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Server panic! %s", str);
 152         inotice("server panic: %s", str);
 153
 154         unlink(pidFileName);
 155         exit(EXIT_FAILURE);
 156 }
 157
 158 /*
 159  * init_sys
 160  *
 161  * inputs       - boot_daemon flag
 162  * output       - none
 163  * side effects - if boot_daemon flag is not set, don't daemonize
 164  */
 165 static void
 166 init_sys(void)
 167 {
 168 #if defined(RLIMIT_FD_MAX) && defined(HAVE_SYS_RLIMIT_H)
 169         struct rlimit limit;
 170
 171         if(!getrlimit(RLIMIT_FD_MAX, &limit))
 172         {
 173
 174                 if(limit.rlim_max < MAXCONNECTIONS)
 175                 {
 176                         fprintf(stderr, "ircd fd table too big\n");
 177                         fprintf(stderr, "Hard Limit: %ld IRC max: %d\n",
 178                                 (long) limit.rlim_max, MAXCONNECTIONS);
 179                         fprintf(stderr, "Fix MAXCONNECTIONS\n");
 180                         exit(-1);
 181                 }
 182
 183                 limit.rlim_cur = limit.rlim_max;        /* make soft limit the max */
 184                 if(setrlimit(RLIMIT_FD_MAX, &limit) == -1)
 185                 {
 186                         fprintf(stderr, "error setting max fd's to %ld\n", (long) limit.rlim_cur);
 187                         exit(EXIT_FAILURE);
 188                 }
 189         }
 190 #endif /* RLIMIT_FD_MAX */
 191 }
 192
 193 static int
 194 make_daemon(void)
 195 {
 196         int pid;
 197         int pip[2];
 198         char c;
 199
 200         if (pipe(pip) < 0)
 201         {
 202                 perror("pipe");
 203                 exit(EXIT_FAILURE);
 204         }
 205         dup2(pip[1], 0);
 206         close(pip[1]);
 207         if((pid = fork()) < 0)
 208         {
 209                 perror("fork");
 210                 exit(EXIT_FAILURE);
 211         }
 212         else if(pid > 0)
 213         {
 214                 close(0);
 215                 /* Wait for initialization to finish, successfully or
 216                  * unsuccessfully. Until this point the child may still
 217                  * write to stdout/stderr.
 218                  * -- jilles */
 219                 if (read(pip[0], &c, 1) > 0)
 220                         exit(EXIT_SUCCESS);
 221                 else
 222                         exit(EXIT_FAILURE);
 223         }
 224
 225         close(pip[0]);
 226         setsid();
 227 /*      fclose(stdin);
 228         fclose(stdout);
 229         fclose(stderr); */
 230
 231         return 0;
 232 }
 233
 234 static int printVersion = 0;
 235
 236 struct lgetopt myopts[] = {
 237         {"dlinefile", &ConfigFileEntry.dlinefile,
 238          STRING, "File to use for dlines.conf"},
 239         {"configfile", &ConfigFileEntry.configfile,
 240          STRING, "File to use for ircd.conf"},
 241         {"klinefile", &ConfigFileEntry.klinefile,
 242          STRING, "File to use for klines.conf"},
 243         {"xlinefile", &ConfigFileEntry.xlinefile,
 244          STRING, "File to use for xlines.conf"},
 245         {"resvfile", &ConfigFileEntry.resvfile,
 246          STRING, "File to use for resv.conf"},
 247         {"logfile", &logFileName,
 248          STRING, "File to use for ircd.log"},
 249         {"pidfile", &pidFileName,
 250          STRING, "File to use for process ID"},
 251         {"foreground", &server_state_foreground,
 252          YESNO, "Run in foreground (don't detach)"},
 253         {"version", &printVersion,
 254          YESNO, "Print version and exit"},
 255         {"conftest", &testing_conf,
 256          YESNO, "Test the configuration files and exit"},
 257         {"help", NULL, USAGE, "Print this text"},
 258         {NULL, NULL, STRING, NULL},
 259 };
 260
 261 void
 262 set_time(void)
 263 {
 264         struct timeval newtime;
 265         newtime.tv_sec = 0;
 266         newtime.tv_usec = 0;
 267 #ifdef HAVE_GETTIMEOFDAY
 268         if(gettimeofday(&newtime, NULL) == -1)
 269         {
 270                 ilog(L_MAIN, "Clock Failure (%d)", errno);
 271                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 272                                      "Clock Failure (%d), TS can be corrupted", errno);
 273
 274                 restart("Clock Failure");
 275         }
 276 #else
 277         newtime.tv_sec = time(NULL);
 278
 279 #endif
 280         if(newtime.tv_sec < CurrentTime)
 281                 set_back_events(CurrentTime - newtime.tv_sec);
 282
 283         SystemTime.tv_sec = newtime.tv_sec;
 284         SystemTime.tv_usec = newtime.tv_usec;
 285 }
 286
 287 static void
 288 check_rehash(void *unused)
 289 {
 290         /*
 291          * Check to see whether we have to rehash the configuration ..
 292          */
 293         if(dorehash)
 294         {
 295                 rehash(1);
 296                 dorehash = 0;
 297         }
 298
 299         if(dorehashbans)
 300         {
 301                 rehash_bans(1);
 302                 dorehashbans = 0;
 303         }
 304
 305         if(doremotd)
 306         {
 307                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 308                                      "Got signal SIGUSR1, reloading ircd motd file");
 309                 free_cachefile(user_motd);
 310                 user_motd = cache_file(MPATH, "ircd.motd", 0);
 311                 doremotd = 0;
 312         }
 313 }
 314
 315 void
 316 seven_io_loop(void)
 317 {
 318         time_t delay;
 319
 320         while (ServerRunning)
 321         {
 322                 /* Run pending events, then get the number of seconds to the next
 323                  * event
 324                  */
 325
 326                 delay = eventNextTime();
 327                 if(delay <= CurrentTime)
 328                         eventRun();
 329
 330
 331                 comm_select(250);
 332         }
 333 }
 334
 335 /*
 336  * initalialize_global_set_options
 337  *
 338  * inputs       - none
 339  * output       - none
 340  * side effects - This sets all global set options needed
 341  */
 342 static void
 343 initialize_global_set_options(void)
 344 {
 345         memset(&GlobalSetOptions, 0, sizeof(GlobalSetOptions));
 346         /* memset( &ConfigFileEntry, 0, sizeof(ConfigFileEntry)); */
 347
 348         GlobalSetOptions.maxclients = MAX_CLIENTS;
 349         GlobalSetOptions.autoconn = 1;
 350
 351         GlobalSetOptions.spam_time = MIN_JOIN_LEAVE_TIME;
 352         GlobalSetOptions.spam_num = MAX_JOIN_LEAVE_COUNT;
 353
 354         if(ConfigFileEntry.default_floodcount)
 355                 GlobalSetOptions.floodcount = ConfigFileEntry.default_floodcount;
 356         else
 357                 GlobalSetOptions.floodcount = 10;
 358
 359         split_servers = ConfigChannel.default_split_server_count;
 360         split_users = ConfigChannel.default_split_user_count;
 361
 362         if(split_users && split_servers
 363            && (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split))
 364         {
 365                 splitmode = 1;
 366                 splitchecking = 1;
 367         }
 368
 369         GlobalSetOptions.ident_timeout = IDENT_TIMEOUT;
 370
 371         strlcpy(GlobalSetOptions.operstring,
 372                 ConfigFileEntry.default_operstring,
 373                 sizeof(GlobalSetOptions.operstring));
 374         strlcpy(GlobalSetOptions.adminstring,
 375                 ConfigFileEntry.default_adminstring,
 376                 sizeof(GlobalSetOptions.adminstring));
 377
 378         /* memset( &ConfigChannel, 0, sizeof(ConfigChannel)); */
 379
 380         /* End of global set options */
 381
 382 }
 383
 384 /*
 385  * initialize_server_capabs
 386  *
 387  * inputs       - none
 388  * output       - none
 389  */
 390 static void
 391 initialize_server_capabs(void)
 392 {
 393         default_server_capabs &= ~CAP_ZIP;
 394 }
 395
 396
 397 /*
 398  * write_pidfile
 399  *
 400  * inputs       - filename+path of pid file
 401  * output       - none
 402  * side effects - write the pid of the ircd to filename
 403  */
 404 static void
 405 write_pidfile(const char *filename)
 406 {
 407         FILE *fb;
 408         char buff[32];
 409         if((fb = fopen(filename, "w")))
 410         {
 411                 unsigned int pid = (unsigned int) getpid();
 412
 413                 ircsnprintf(buff, sizeof(buff), "%u\n", pid);
 414                 if((fputs(buff, fb) == -1))
 415                 {
 416                         ilog(L_MAIN, "Error writing %u to pid file %s (%s)",
 417                              pid, filename, strerror(errno));
 418                 }
 419                 fclose(fb);
 420                 return;
 421         }
 422         else
 423         {
 424                 ilog(L_MAIN, "Error opening pid file %s", filename);
 425         }
 426 }
 427
 428 /*
 429  * check_pidfile
 430  *
 431  * inputs       - filename+path of pid file
 432  * output       - none
 433  * side effects - reads pid from pidfile and checks if ircd is in process
 434  *                list. if it is, gracefully exits
 435  * -kre
 436  */
 437 static void
 438 check_pidfile(const char *filename)
 439 {
 440         FILE *fb;
 441         char buff[32];
 442         pid_t pidfromfile;
 443
 444         /* Don't do logging here, since we don't have log() initialised */
 445         if((fb = fopen(filename, "r")))
 446         {
 447                 if(fgets(buff, 20, fb) != NULL)
 448                 {
 449                         pidfromfile = atoi(buff);
 450                         if(!kill(pidfromfile, 0))
 451                         {
 452                                 printf("ircd: daemon is already running\n");
 453                                 exit(-1);
 454                         }
 455                 }
 456                 fclose(fb);
 457         }
 458 }
 459
 460 /*
 461  * setup_corefile
 462  *
 463  * inputs       - nothing
 464  * output       - nothing
 465  * side effects - setups corefile to system limits.
 466  * -kre
 467  */
 468 static void
 469 setup_corefile(void)
 470 {
 471 #ifdef HAVE_SYS_RESOURCE_H
 472         struct rlimit rlim;     /* resource limits */
 473
 474         /* Set corefilesize to maximum */
 475         if(!getrlimit(RLIMIT_CORE, &rlim))
 476         {
 477                 rlim.rlim_cur = rlim.rlim_max;
 478                 setrlimit(RLIMIT_CORE, &rlim);
 479         }
 480 #endif
 481 }
 482
 483 /*
 484  * main
 485  *
 486  * Initializes the IRCd.
 487  *
 488  * Inputs       - number of commandline args, args themselves
 489  * Outputs      - none
 490  * Side Effects - this is where the ircd gets going right now
 491  */
 492 int
 493 main(int argc, char *argv[])
 494 {
 495         int fd;
 496
 497         /* Check to see if the user is running us as root, which is a nono */
 498         if(geteuid() == 0)
 499         {
 500                 fprintf(stderr, "Don't run ircd as root!!!\n");
 501                 return -1;
 502         }
 503
 504         /*
 505          * save server boot time right away, so getrusage works correctly
 506          */
 507         set_time();
 508         /*
 509          * Setup corefile size immediately after boot -kre
 510          */
 511         setup_corefile();
 512
 513         /*
 514          * set initialVMTop before we allocate any memory
 515          */
 516         initialVMTop = get_vm_top();
 517
 518         ServerRunning = 0;
 519         /* It ain't random, but it ought to be a little harder to guess */
 520         srand(SystemTime.tv_sec ^ (SystemTime.tv_usec | (getpid() << 20)));
 521         memset(&me, 0, sizeof(me));
 522         memset(&meLocalUser, 0, sizeof(meLocalUser));
 523         me.localClient = &meLocalUser;
 524
 525         /* Make sure all lists are zeroed */
 526         memset(&unknown_list, 0, sizeof(unknown_list));
 527         memset(&lclient_list, 0, sizeof(lclient_list));
 528         memset(&serv_list, 0, sizeof(serv_list));
 529         memset(&global_serv_list, 0, sizeof(global_serv_list));
 530         memset(&local_oper_list, 0, sizeof(local_oper_list));
 531         memset(&oper_list, 0, sizeof(oper_list));
 532
 533         dlinkAddTail(&me, &me.node, &global_client_list);
 534
 535         memset((void *) &Count, 0, sizeof(Count));
 536         memset((void *) &ServerInfo, 0, sizeof(ServerInfo));
 537         memset((void *) &AdminInfo, 0, sizeof(AdminInfo));
 538
 539         /* Initialise the channel capability usage counts... */
 540         init_chcap_usage_counts();
 541
 542         ConfigFileEntry.dpath = DPATH;
 543         ConfigFileEntry.configfile = CPATH;     /* Server configuration file */
 544         ConfigFileEntry.klinefile = KPATH;      /* Server kline file */
 545         ConfigFileEntry.dlinefile = DLPATH;     /* dline file */
 546         ConfigFileEntry.xlinefile = XPATH;
 547         ConfigFileEntry.resvfile = RESVPATH;
 548         ConfigFileEntry.connect_timeout = 30;   /* Default to 30 */
 549         myargv = argv;
 550         umask(077);             /* better safe than sorry --SRB */
 551
 552         parseargs(&argc, &argv, myopts);
 553
 554         if(printVersion)
 555         {
 556                 printf("ircd: version %s\n", ircd_version);
 557                 exit(EXIT_SUCCESS);
 558         }
 559
 560         if(chdir(ConfigFileEntry.dpath))
 561         {
 562                 fprintf(stderr, "Unable to chdir to %s: %s\n", ConfigFileEntry.dpath, strerror(errno));
 563                 exit(EXIT_FAILURE);
 564         }
 565
 566         setup_signals();
 567
 568 #ifdef __CYGWIN__
 569         server_state_foreground = 1;
 570 #endif
 571
 572         if (testing_conf)
 573                 server_state_foreground = 1;
 574
 575         /* Make sure fd 0, 1 and 2 are in use -- jilles */
 576         do
 577         {
 578                 fd = open("/dev/null", O_RDWR);
 579         } while (fd < 2 && fd != -1);
 580         if (fd > 2)
 581                 close(fd);
 582         else if (fd == -1)
 583                 exit(1);
 584
 585         /* Check if there is pidfile and daemon already running */
 586         if(!testing_conf)
 587         {
 588                 check_pidfile(pidFileName);
 589
 590                 if(!server_state_foreground)
 591                         make_daemon();
 592                 inotice("starting %s ...", ircd_version);
 593         }
 594
 595         /* Init the event subsystem */
 596         libseven_init(ircd_log_cb, restart, ircd_die_cb);
 597         init_sys();
 598
 599         fdlist_init();
 600         if(!server_state_foreground)
 601         {
 602                 comm_close_all();
 603         }
 604
 605         init_main_logfile();
 606         init_patricia();
 607         newconf_init();
 608         init_s_conf();
 609         init_s_newconf();
 610         init_hash();
 611         clear_scache_hash_table();      /* server cache name table */
 612         init_host_hash();
 613         clear_hash_parse();
 614         init_client();
 615         initUser();
 616         init_hook();
 617         init_channels();
 618         initclass();
 619         initwhowas();
 620         init_stats();
 621         init_reject();
 622         init_cache();
 623         init_monitor();
 624         init_isupport();
 625         load_all_modules(1);
 626 #ifndef STATIC_MODULES
 627         load_core_modules(1);
 628 #endif
 629         init_auth();            /* Initialise the auth code */
 630         init_resolver();        /* Needs to be setup before the io loop */
 631
 632         if (testing_conf)
 633                 fprintf(stderr, "\nBeginning config test\n");
 634         read_conf_files(YES);   /* cold start init conf files */
 635         rehash_bans(0);
 636 #ifndef STATIC_MODULES
 637
 638         mod_add_path(MODULE_DIR);
 639         mod_add_path(MODULE_DIR "/autoload");
 640 #endif
 641
 642         initialize_server_capabs();     /* Set up default_server_capabs */
 643         initialize_global_set_options();
 644
 645         if(ServerInfo.name == NULL)
 646         {
 647                 ierror("no server name specified in serverinfo block.");
 648                 return -1;
 649         }
 650         strlcpy(me.name, ServerInfo.name, sizeof(me.name));
 651
 652         if(ServerInfo.sid[0] == '\0')
 653         {
 654                 ierror("no server sid specified in serverinfo block.");
 655                 return -2;
 656         }
 657         strcpy(me.id, ServerInfo.sid);
 658         init_uid();
 659
 660         /* serverinfo{} description must exist.  If not, error out. */
 661         if(ServerInfo.description == NULL)
 662         {
 663                 ierror("no server description specified in serverinfo block.");
 664                 return -3;
 665         }
 666         strlcpy(me.info, ServerInfo.description, sizeof(me.info));
 667
 668         if (testing_conf)
 669         {
 670                 fprintf(stderr, "\nConfig testing complete.\n");
 671                 fflush(stderr);
 672                 return 0;       /* Why? We want the launcher to exit out. */
 673         }
 674
 675         me.from = &me;
 676         me.servptr = &me;
 677         SetMe(&me);
 678         make_server(&me);
 679         me.serv->up = me.name;
 680         startup_time = CurrentTime;
 681         add_to_client_hash(me.name, &me);
 682         add_to_id_hash(me.id, &me);
 683
 684         dlinkAddAlloc(&me, &global_serv_list);
 685
 686         construct_umodebuf();
 687
 688         check_class();
 689         write_pidfile(pidFileName);
 690         load_help();
 691         open_logfiles();
 692
 693         ilog(L_MAIN, "Server Ready");
 694
 695         /* We want try_connections to be called as soon as possible now! -- adrian */
 696         /* No, 'cause after a restart it would cause all sorts of nick collides */
 697         /* um.  by waiting even longer, that just means we have even *more*
 698          * nick collisions.  what a stupid idea. set an event for the IO loop --fl
 699          */
 700         eventAddIsh("try_connections", try_connections, NULL, STARTUP_CONNECTIONS_TIME);
 701         eventAddOnce("try_connections_startup", try_connections, NULL, 0);
 702
 703         eventAddIsh("collect_zipstats", collect_zipstats, NULL, ZIPSTATS_TIME);
 704
 705         /* Setup the timeout check. I'll shift it later :)  -- adrian */
 706         eventAddIsh("comm_checktimeouts", comm_checktimeouts, NULL, 1);
 707
 708         eventAdd("check_rehash", check_rehash, NULL, 1);
 709
 710         if(ConfigServerHide.links_delay > 0)
 711                 eventAdd("cache_links", cache_links, NULL,
 712                             ConfigServerHide.links_delay);
 713         else
 714                 ConfigServerHide.links_disabled = 1;
 715
 716         if(splitmode)
 717                 eventAdd("check_splitmode", check_splitmode, NULL, 2);
 718
 719         ServerRunning = 1;
 720
 721         print_startup(getpid());
 722
 723         seven_io_loop();
 724
 725         return 0;
 726 }