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  *  $Id: ircd.c 3380 2007-04-03 22:25:11Z jilles $
  25  */
  26
  27 #include "ratbox_lib.h"
  28 #include "stdinc.h"
  29 #include "setup.h"
  30 #include "config.h"
  31 #include "ircd.h"
  32 #include "channel.h"
  33 #include "class.h"
  34 #include "client.h"
  35 #include "common.h"
  36 #include "hash.h"
  37 #include "irc_string.h"
  38 #include "ircd_signal.h"
  39 #include "sprintf_irc.h"
  40 #include "s_gline.h"
  41 #include "msg.h"                /* msgtab */
  42 #include "hostmask.h"
  43 #include "numeric.h"
  44 #include "parse.h"
  45 #include "res.h"
  46 #include "restart.h"
  47 #include "s_auth.h"
  48 #include "s_conf.h"
  49 #include "logger.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 "hook.h"
  59 #include "ircd_getopt.h"
  60 #include "newconf.h"
  61 #include "reject.h"
  62 #include "s_conf.h"
  63 #include "s_newconf.h"
  64 #include "cache.h"
  65 #include "monitor.h"
  66 #include "patchlevel.h"
  67 #include "serno.h"
  68 #include "sslproc.h"
  69
  70 extern int ServerRunning;
  71 extern struct LocalUser meLocalUser;
  72 extern char **myargv;
  73
  74 int maxconnections;
  75
  76 /* /quote set variables */
  77 struct SetOptions GlobalSetOptions;
  78
  79 /* configuration set from ircd.conf */
  80 struct config_file_entry ConfigFileEntry;
  81 /* server info set from ircd.conf */
  82 struct server_info ServerInfo;
  83 /* admin info set from ircd.conf */
  84 struct admin_info AdminInfo;
  85
  86 struct Counter Count;
  87 struct ServerStatistics ServerStats;
  88
  89 int ssl_ok = 0;
  90 int zlib_ok = 1;
  91
  92 /*
  93  * print_startup - print startup information
  94  */
  95 static void
  96 print_startup(int pid)
  97 {
  98         inotice("now running in %s mode from %s as pid %d ...",
  99                !server_state_foreground ? "background" : "foreground",
 100                 ConfigFileEntry.dpath, pid);
 101
 102         /* let the parent process know the initialization was successful
 103          * -- jilles */
 104         if (!server_state_foreground)
 105                 write(0, ".", 1);
 106         fclose(stdin);
 107         fclose(stdout);
 108         fclose(stderr);
 109         open("/dev/null", O_RDWR);
 110         dup2(0, 1);
 111         dup2(0, 2);
 112 }
 113
 114 static void
 115 ircd_log_cb(const char *str)
 116 {
 117         ilog(L_MAIN, "%s", str);
 118 }
 119
 120 static void
 121 ircd_restart_cb(const char *str)
 122 {
 123         restart(str);
 124 }
 125
 126 /*
 127  * Why EXIT_FAILURE here?
 128  * Because if ircd_die_cb() is called it's because of a fatal
 129  * error inside libcharybdis, and we don't know how to handle the
 130  * exception, so it is logical to return a FAILURE exit code here.
 131  *    --nenolod
 132  */
 133 static void
 134 ircd_die_cb(const char *str)
 135 {
 136         /* Try to get the message out to currently logged in operators. */
 137         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Server panic! %s", str);
 138         inotice("server panic: %s", str);
 139
 140         unlink(pidFileName);
 141         exit(EXIT_FAILURE);
 142 }
 143
 144 /*
 145  * init_sys
 146  *
 147  * inputs       - boot_daemon flag
 148  * output       - none
 149  * side effects - if boot_daemon flag is not set, don't daemonize
 150  */
 151 static void
 152 init_sys(void)
 153 {
 154 #if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H)
 155         struct rlimit limit;
 156
 157         if(!getrlimit(RLIMIT_NOFILE, &limit))
 158         {
 159                 maxconnections = limit.rlim_cur;
 160                 if(maxconnections <= MAX_BUFFER)
 161                 {
 162                         fprintf(stderr, "ERROR: Shell FD limits are too low.\n");
 163                         fprintf(stderr, "ERROR: ircd-ratbox reserves %d FDs, shell limits must be above this\n", MAX_BUFFER);
 164                         exit(EXIT_FAILURE);
 165                 }
 166                 return;
 167         }
 168 #endif /* RLIMIT_FD_MAX */
 169         maxconnections = MAXCONNECTIONS;
 170 }
 171
 172 static int
 173 make_daemon(void)
 174 {
 175         int pid;
 176         int pip[2];
 177         char c;
 178
 179         if (pipe(pip) < 0)
 180         {
 181                 perror("pipe");
 182                 exit(EXIT_FAILURE);
 183         }
 184         dup2(pip[1], 0);
 185         close(pip[1]);
 186         if((pid = fork()) < 0)
 187         {
 188                 perror("fork");
 189                 exit(EXIT_FAILURE);
 190         }
 191         else if(pid > 0)
 192         {
 193                 close(0);
 194                 /* Wait for initialization to finish, successfully or
 195                  * unsuccessfully. Until this point the child may still
 196                  * write to stdout/stderr.
 197                  * -- jilles */
 198                 if (read(pip[0], &c, 1) > 0)
 199                         exit(EXIT_SUCCESS);
 200                 else
 201                         exit(EXIT_FAILURE);
 202         }
 203
 204         close(pip[0]);
 205         setsid();
 206 /*      fclose(stdin);
 207         fclose(stdout);
 208         fclose(stderr); */
 209
 210         return 0;
 211 }
 212
 213 static int printVersion = 0;
 214
 215 struct lgetopt myopts[] = {
 216         {"dlinefile", &ConfigFileEntry.dlinefile,
 217          STRING, "File to use for dlines.conf"},
 218         {"configfile", &ConfigFileEntry.configfile,
 219          STRING, "File to use for ircd.conf"},
 220         {"klinefile", &ConfigFileEntry.klinefile,
 221          STRING, "File to use for kline.conf"},
 222         {"xlinefile", &ConfigFileEntry.xlinefile,
 223          STRING, "File to use for xline.conf"},
 224         {"resvfile", &ConfigFileEntry.resvfile,
 225          STRING, "File to use for resv.conf"},
 226         {"logfile", &logFileName,
 227          STRING, "File to use for ircd.log"},
 228         {"pidfile", &pidFileName,
 229          STRING, "File to use for process ID"},
 230         {"foreground", &server_state_foreground,
 231          YESNO, "Run in foreground (don't detach)"},
 232         {"version", &printVersion,
 233          YESNO, "Print version and exit"},
 234         {"conftest", &testing_conf,
 235          YESNO, "Test the configuration files and exit"},
 236         {"help", NULL, USAGE, "Print this text"},
 237         {NULL, NULL, STRING, NULL},
 238 };
 239
 240 static void
 241 check_rehash(void *unused)
 242 {
 243         /*
 244          * Check to see whether we have to rehash the configuration ..
 245          */
 246         if(dorehash)
 247         {
 248                 rehash(1);
 249                 dorehash = 0;
 250         }
 251
 252         if(dorehashbans)
 253         {
 254                 rehash_bans(1);
 255                 dorehashbans = 0;
 256         }
 257
 258         if(doremotd)
 259         {
 260                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 261                                      "Got signal SIGUSR1, reloading ircd motd file");
 262                 free_cachefile(user_motd);
 263                 user_motd = cache_file(MPATH, "ircd.motd", 0);
 264                 doremotd = 0;
 265         }
 266 }
 267
 268 /*
 269  * initalialize_global_set_options
 270  *
 271  * inputs       - none
 272  * output       - none
 273  * side effects - This sets all global set options needed
 274  */
 275 static void
 276 initialize_global_set_options(void)
 277 {
 278         memset(&GlobalSetOptions, 0, sizeof(GlobalSetOptions));
 279         /* memset( &ConfigFileEntry, 0, sizeof(ConfigFileEntry)); */
 280
 281         GlobalSetOptions.maxclients = ServerInfo.default_max_clients;
 282
 283         if(GlobalSetOptions.maxclients > (maxconnections - MAX_BUFFER))
 284                 GlobalSetOptions.maxclients = maxconnections - MAX_BUFFER;
 285
 286         GlobalSetOptions.autoconn = 1;
 287
 288         GlobalSetOptions.spam_time = MIN_JOIN_LEAVE_TIME;
 289         GlobalSetOptions.spam_num = MAX_JOIN_LEAVE_COUNT;
 290
 291         if(ConfigFileEntry.default_floodcount)
 292                 GlobalSetOptions.floodcount = ConfigFileEntry.default_floodcount;
 293         else
 294                 GlobalSetOptions.floodcount = 10;
 295
 296         split_servers = ConfigChannel.default_split_server_count;
 297         split_users = ConfigChannel.default_split_user_count;
 298
 299         if(split_users && split_servers
 300            && (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split))
 301         {
 302                 splitmode = 1;
 303                 splitchecking = 1;
 304         }
 305
 306         GlobalSetOptions.ident_timeout = IDENT_TIMEOUT;
 307
 308         strlcpy(GlobalSetOptions.operstring,
 309                 ConfigFileEntry.default_operstring,
 310                 sizeof(GlobalSetOptions.operstring));
 311         strlcpy(GlobalSetOptions.adminstring,
 312                 ConfigFileEntry.default_adminstring,
 313                 sizeof(GlobalSetOptions.adminstring));
 314
 315         /* memset( &ConfigChannel, 0, sizeof(ConfigChannel)); */
 316
 317         /* End of global set options */
 318
 319 }
 320
 321 /*
 322  * initialize_server_capabs
 323  *
 324  * inputs       - none
 325  * output       - none
 326  */
 327 static void
 328 initialize_server_capabs(void)
 329 {
 330         default_server_capabs &= ~CAP_ZIP;
 331 }
 332
 333
 334 /*
 335  * write_pidfile
 336  *
 337  * inputs       - filename+path of pid file
 338  * output       - none
 339  * side effects - write the pid of the ircd to filename
 340  */
 341 static void
 342 write_pidfile(const char *filename)
 343 {
 344         FILE *fb;
 345         char buff[32];
 346         if((fb = fopen(filename, "w")))
 347         {
 348                 unsigned int pid = (unsigned int) getpid();
 349
 350                 rb_snprintf(buff, sizeof(buff), "%u\n", pid);
 351                 if((fputs(buff, fb) == -1))
 352                 {
 353                         ilog(L_MAIN, "Error writing %u to pid file %s (%s)",
 354                              pid, filename, strerror(errno));
 355                 }
 356                 fclose(fb);
 357                 return;
 358         }
 359         else
 360         {
 361                 ilog(L_MAIN, "Error opening pid file %s", filename);
 362         }
 363 }
 364
 365 /*
 366  * check_pidfile
 367  *
 368  * inputs       - filename+path of pid file
 369  * output       - none
 370  * side effects - reads pid from pidfile and checks if ircd is in process
 371  *                list. if it is, gracefully exits
 372  * -kre
 373  */
 374 static void
 375 check_pidfile(const char *filename)
 376 {
 377         FILE *fb;
 378         char buff[32];
 379         pid_t pidfromfile;
 380
 381         /* Don't do logging here, since we don't have log() initialised */
 382         if((fb = fopen(filename, "r")))
 383         {
 384                 if(fgets(buff, 20, fb) != NULL)
 385                 {
 386                         pidfromfile = atoi(buff);
 387                         if(!kill(pidfromfile, 0))
 388                         {
 389                                 printf("ircd: daemon is already running\n");
 390                                 exit(-1);
 391                         }
 392                 }
 393                 fclose(fb);
 394         }
 395 }
 396
 397 /*
 398  * setup_corefile
 399  *
 400  * inputs       - nothing
 401  * output       - nothing
 402  * side effects - setups corefile to system limits.
 403  * -kre
 404  */
 405 static void
 406 setup_corefile(void)
 407 {
 408 #ifdef HAVE_SYS_RESOURCE_H
 409         struct rlimit rlim;     /* resource limits */
 410
 411         /* Set corefilesize to maximum */
 412         if(!getrlimit(RLIMIT_CORE, &rlim))
 413         {
 414                 rlim.rlim_cur = rlim.rlim_max;
 415                 setrlimit(RLIMIT_CORE, &rlim);
 416         }
 417 #endif
 418 }
 419
 420 struct ev_entry *check_splitmode_ev = NULL;
 421
 422 /*
 423  * main
 424  *
 425  * Initializes the IRCd.
 426  *
 427  * Inputs       - number of commandline args, args themselves
 428  * Outputs      - none
 429  * Side Effects - this is where the ircd gets going right now
 430  */
 431 int
 432 main(int argc, char *argv[])
 433 {
 434         int fd;
 435
 436         /* Check to see if the user is running us as root, which is a nono */
 437         if(geteuid() == 0)
 438         {
 439                 fprintf(stderr, "Don't run ircd as root!!!\n");
 440                 return -1;
 441         }
 442
 443         /*
 444          * Setup corefile size immediately after boot -kre
 445          */
 446         setup_corefile();
 447
 448         ServerRunning = 0;
 449         /* It ain't random, but it ought to be a little harder to guess */
 450         srand(SystemTime.tv_sec ^ (SystemTime.tv_usec | (getpid() << 20)));
 451         memset(&me, 0, sizeof(me));
 452         memset(&meLocalUser, 0, sizeof(meLocalUser));
 453         me.localClient = &meLocalUser;
 454
 455         /* Make sure all lists are zeroed */
 456         memset(&unknown_list, 0, sizeof(unknown_list));
 457         memset(&lclient_list, 0, sizeof(lclient_list));
 458         memset(&serv_list, 0, sizeof(serv_list));
 459         memset(&global_serv_list, 0, sizeof(global_serv_list));
 460         memset(&local_oper_list, 0, sizeof(local_oper_list));
 461         memset(&oper_list, 0, sizeof(oper_list));
 462
 463         rb_dlinkAddTail(&me, &me.node, &global_client_list);
 464
 465         memset(&Count, 0, sizeof(Count));
 466         memset(&ServerInfo, 0, sizeof(ServerInfo));
 467         memset(&AdminInfo, 0, sizeof(AdminInfo));
 468         memset(&ServerStats, 0, sizeof(struct ServerStatistics));
 469
 470         /* Initialise the channel capability usage counts... */
 471         init_chcap_usage_counts();
 472
 473         ConfigFileEntry.dpath = DPATH;
 474         ConfigFileEntry.configfile = CPATH;     /* Server configuration file */
 475         ConfigFileEntry.klinefile = KPATH;      /* Server kline file */
 476         ConfigFileEntry.dlinefile = DLPATH;     /* dline file */
 477         ConfigFileEntry.xlinefile = XPATH;
 478         ConfigFileEntry.resvfile = RESVPATH;
 479         ConfigFileEntry.connect_timeout = 30;   /* Default to 30 */
 480         myargv = argv;
 481         umask(077);             /* better safe than sorry --SRB */
 482
 483         parseargs(&argc, &argv, myopts);
 484
 485         if(printVersion)
 486         {
 487                 printf("ircd: version %s\n", ircd_version);
 488                 exit(EXIT_SUCCESS);
 489         }
 490
 491         if(chdir(ConfigFileEntry.dpath))
 492         {
 493                 fprintf(stderr, "Unable to chdir to %s: %s\n", ConfigFileEntry.dpath, strerror(errno));
 494                 exit(EXIT_FAILURE);
 495         }
 496
 497         setup_signals();
 498
 499 #ifdef __CYGWIN__
 500         server_state_foreground = 1;
 501 #endif
 502
 503         if (testing_conf)
 504                 server_state_foreground = 1;
 505
 506         /* Make sure fd 0, 1 and 2 are in use -- jilles */
 507         do
 508         {
 509                 fd = open("/dev/null", O_RDWR);
 510         } while (fd < 2 && fd != -1);
 511         if (fd > 2)
 512                 close(fd);
 513         else if (fd == -1)
 514                 exit(1);
 515
 516         /* Check if there is pidfile and daemon already running */
 517         if(!testing_conf)
 518         {
 519                 check_pidfile(pidFileName);
 520
 521                 if(!server_state_foreground)
 522                         make_daemon();
 523                 inotice("starting %s ...", ircd_version);
 524         }
 525
 526         /* Init the event subsystem */
 527         init_sys();
 528         rb_lib_init(ircd_log_cb, ircd_restart_cb, ircd_die_cb, !server_state_foreground, maxconnections, DNODE_HEAP_SIZE, FD_HEAP_SIZE);
 529         rb_linebuf_init(LINEBUF_HEAP_SIZE);
 530
 531         init_main_logfile();
 532         newconf_init();
 533         init_s_conf();
 534         init_s_newconf();
 535         init_hash();
 536         clear_scache_hash_table();      /* server cache name table */
 537         init_host_hash();
 538         clear_hash_parse();
 539         init_client();
 540         initUser();
 541         init_hook();
 542         init_channels();
 543         initclass();
 544         initwhowas();
 545         init_reject();
 546         init_cache();
 547         init_monitor();
 548         init_isupport();
 549         load_all_modules(1);
 550 #ifndef STATIC_MODULES
 551         load_core_modules(1);
 552 #endif
 553         init_auth();            /* Initialise the auth code */
 554         init_resolver();        /* Needs to be setup before the io loop */
 555
 556         if (testing_conf)
 557                 fprintf(stderr, "\nBeginning config test\n");
 558         read_conf_files(YES);   /* cold start init conf files */
 559         rehash_bans(0);
 560 #ifndef STATIC_MODULES
 561
 562         mod_add_path(MODULE_DIR);
 563         mod_add_path(MODULE_DIR "/autoload");
 564 #endif
 565
 566         init_ssld();
 567
 568         initialize_server_capabs();     /* Set up default_server_capabs */
 569         initialize_global_set_options();
 570
 571         if(ServerInfo.name == NULL)
 572         {
 573                 ierror("no server name specified in serverinfo block.");
 574                 return -1;
 575         }
 576         strlcpy(me.name, ServerInfo.name, sizeof(me.name));
 577
 578         if(ServerInfo.sid[0] == '\0')
 579         {
 580                 ierror("no server sid specified in serverinfo block.");
 581                 return -2;
 582         }
 583         strcpy(me.id, ServerInfo.sid);
 584         init_uid();
 585
 586         /* serverinfo{} description must exist.  If not, error out. */
 587         if(ServerInfo.description == NULL)
 588         {
 589                 ierror("no server description specified in serverinfo block.");
 590                 return -3;
 591         }
 592         strlcpy(me.info, ServerInfo.description, sizeof(me.info));
 593
 594         if(ServerInfo.ssl_cert != NULL && ServerInfo.ssl_private_key != NULL)
 595         {
 596                 /* just do the rb_setup_ssl_server to validate the config */
 597                 if(!rb_setup_ssl_server(ServerInfo.ssl_cert, ServerInfo.ssl_private_key, ServerInfo.ssl_dh_params))
 598                 {
 599                         ilog(L_MAIN, "WARNING: Unable to setup SSL.");
 600                         ssl_ok = 0;
 601                 }
 602                 else
 603                         ssl_ok = 1;
 604         }
 605
 606         if (testing_conf)
 607         {
 608                 fprintf(stderr, "\nConfig testing complete.\n");
 609                 fflush(stderr);
 610                 return 0;       /* Why? We want the launcher to exit out. */
 611         }
 612
 613         me.from = &me;
 614         me.servptr = &me;
 615         SetMe(&me);
 616         make_server(&me);
 617         startup_time = rb_current_time();
 618         add_to_client_hash(me.name, &me);
 619         add_to_id_hash(me.id, &me);
 620         me.serv->nameinfo = scache_connect(me.name, me.info, 0);
 621
 622         rb_dlinkAddAlloc(&me, &global_serv_list);
 623
 624         construct_umodebuf();
 625
 626         check_class();
 627         write_pidfile(pidFileName);
 628         load_help();
 629         open_logfiles();
 630
 631         ilog(L_MAIN, "Server Ready");
 632
 633         rb_event_addish("cleanup_glines", cleanup_glines, NULL, CLEANUP_GLINES_TIME);
 634
 635         /* We want try_connections to be called as soon as possible now! -- adrian */
 636         /* No, 'cause after a restart it would cause all sorts of nick collides */
 637         /* um.  by waiting even longer, that just means we have even *more*
 638          * nick collisions.  what a stupid idea. set an event for the IO loop --fl
 639          */
 640         rb_event_addish("try_connections", try_connections, NULL, STARTUP_CONNECTIONS_TIME);
 641         rb_event_addonce("try_connections_startup", try_connections, NULL, 0);
 642
 643         /* Setup the timeout check. I'll shift it later :)  -- adrian */
 644         rb_event_addish("rb_checktimeouts", rb_checktimeouts, NULL, 1);
 645
 646         rb_event_add("check_rehash", check_rehash, NULL, 1);
 647
 648         if(splitmode)
 649                 check_splitmode_ev = rb_event_add("check_splitmode", check_splitmode, NULL, 2);
 650
 651         ServerRunning = 1;
 652
 653         print_startup(getpid());
 654
 655         rb_lib_loop(250);
 656
 657         return 0;
 658 }