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