/* * charybdis: A slightly useful ircd. * ircd.c: Starts up and runs the ircd. * * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center * Copyright (C) 1996-2002 Hybrid Development Team * Copyright (C) 2002-2008 ircd-ratbox development team * Copyright (C) 2005-2013 charybdis development team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ #include #include #include #include #include #include #include #include #include #include /* msgtab */ #include #include #include #include #include #include #include /* try_connections */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void ircd_die_cb(const char *str) __attribute__((noreturn)); /* /quote set variables */ struct SetOptions GlobalSetOptions; /* configuration set from ircd.conf */ struct config_file_entry ConfigFileEntry; /* server info set from ircd.conf */ struct server_info ServerInfo; /* admin info set from ircd.conf */ struct admin_info AdminInfo; struct Counter Count; struct ServerStatistics ServerStats; int maxconnections; struct Client me; /* That's me */ struct LocalUser meLocalUser; /* That's also part of me */ rb_dlink_list global_client_list; /* unknown/client pointer lists */ rb_dlink_list unknown_list; /* unknown clients ON this server only */ rb_dlink_list lclient_list; /* local clients only ON this server */ rb_dlink_list serv_list; /* local servers to this server ONLY */ rb_dlink_list global_serv_list; /* global servers on the network */ rb_dlink_list local_oper_list; /* our opers, duplicated in lclient_list */ rb_dlink_list oper_list; /* network opers */ char * const *myargv; volatile sig_atomic_t dorehash = false; volatile sig_atomic_t dorehashbans = false; volatile sig_atomic_t doremotd = false; bool kline_queued = false; bool server_state_foreground = false; bool opers_see_all_users = false; bool ircd_ssl_ok = false; bool ircd_zlib_ok = true; int testing_conf = 0; time_t startup_time; int default_server_capabs; int splitmode; int splitchecking; int split_users; int split_servers; int eob_count; const char *ircd_paths[IRCD_PATH_COUNT] = { [IRCD_PATH_PREFIX] = DPATH, [IRCD_PATH_MODULES] = MODPATH, [IRCD_PATH_AUTOLOAD_MODULES] = AUTOMODPATH, [IRCD_PATH_ETC] = ETCPATH, [IRCD_PATH_LOG] = LOGPATH, [IRCD_PATH_USERHELP] = UHPATH, [IRCD_PATH_OPERHELP] = HPATH, [IRCD_PATH_IRCD_EXEC] = SPATH, [IRCD_PATH_IRCD_CONF] = CPATH, [IRCD_PATH_IRCD_MOTD] = MPATH, [IRCD_PATH_IRCD_LOG] = LPATH, [IRCD_PATH_IRCD_PID] = PPATH, [IRCD_PATH_IRCD_OMOTD] = OPATH, [IRCD_PATH_BANDB] = DBPATH, [IRCD_PATH_BIN] = BINPATH, [IRCD_PATH_LIBEXEC] = PKGLIBEXECDIR, }; const char *ircd_pathnames[IRCD_PATH_COUNT] = { [IRCD_PATH_PREFIX] = "prefix", [IRCD_PATH_MODULES] = "modules", [IRCD_PATH_AUTOLOAD_MODULES] = "autoload modules", [IRCD_PATH_ETC] = "config", [IRCD_PATH_LOG] = "log", [IRCD_PATH_USERHELP] = "user help", [IRCD_PATH_OPERHELP] = "oper help", [IRCD_PATH_IRCD_EXEC] = "ircd binary", [IRCD_PATH_IRCD_CONF] = "ircd.conf", [IRCD_PATH_IRCD_MOTD] = "ircd.motd", [IRCD_PATH_IRCD_LOG] = "ircd.log", [IRCD_PATH_IRCD_PID] = "ircd.pid", [IRCD_PATH_IRCD_OMOTD] = "oper motd", [IRCD_PATH_BANDB] = "bandb", [IRCD_PATH_BIN] = "binary dir", [IRCD_PATH_LIBEXEC] = "libexec dir", }; const char *logFileName = NULL; const char *pidFileName = NULL; void ircd_shutdown(const char *reason) { struct Client *target_p; rb_dlink_node *ptr; RB_DLINK_FOREACH(ptr, lclient_list.head) { target_p = ptr->data; sendto_one(target_p, ":%s NOTICE %s :Server Terminating. %s", me.name, target_p->name, reason); } RB_DLINK_FOREACH(ptr, serv_list.head) { target_p = ptr->data; sendto_one(target_p, ":%s ERROR :Terminated by %s", me.name, reason); } ilog(L_MAIN, "Server Terminating. %s", reason); close_logfiles(); unlink(pidFileName); exit(0); } /* * print_startup - print startup information */ static void print_startup(int pid) { int fd; #ifndef _WIN32 close(1); fd = open("/dev/null", O_RDWR); if (fd == -1) { perror("open /dev/null"); exit(EXIT_FAILURE); } if (fd == 0) fd = dup(fd); if (fd != 1) abort(); #endif inotice("now running in %s mode from %s as pid %d ...", !server_state_foreground ? "background" : "foreground", ConfigFileEntry.dpath, pid); #ifndef _WIN32 /* let the parent process know the initialization was successful * -- jilles */ if (!server_state_foreground) { /* GCC complains on Linux if we don't check the value of write pedantically. * Technically you're supposed to check the value, yes, but it probably can't fail. * No, casting to void is of no use to shut the warning up. You HAVE to use the value. * --Elizfaox */ if(write(0, ".", 1) < 1) abort(); } if (dup2(1, 0) == -1) abort(); if (dup2(1, 2) == -1) abort(); #endif } /* * init_sys * * inputs - boot_daemon flag * output - none * side effects - if boot_daemon flag is not set, don't daemonize */ static void init_sys(void) { #if !defined(_WIN32) && defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H) struct rlimit limit; if(!getrlimit(RLIMIT_NOFILE, &limit)) { maxconnections = limit.rlim_cur; if(maxconnections <= MAX_BUFFER) { fprintf(stderr, "ERROR: Shell FD limits are too low.\n"); fprintf(stderr, "ERROR: charybdis reserves %d FDs, shell limits must be above this\n", MAX_BUFFER); exit(EXIT_FAILURE); } return; } #endif /* RLIMIT_FD_MAX */ maxconnections = MAXCONNECTIONS; } static int make_daemon(void) { #ifndef _WIN32 int pid; int pip[2]; char c; if (pipe(pip) < 0) { perror("pipe"); exit(EXIT_FAILURE); } dup2(pip[1], 0); close(pip[1]); if((pid = fork()) < 0) { perror("fork"); exit(EXIT_FAILURE); } else if(pid > 0) { close(0); /* Wait for initialization to finish, successfully or * unsuccessfully. Until this point the child may still * write to stdout/stderr. * -- jilles */ if (read(pip[0], &c, 1) > 0) exit(EXIT_SUCCESS); else exit(EXIT_FAILURE); } close(pip[0]); setsid(); /* fclose(stdin); fclose(stdout); fclose(stderr); */ #endif return 0; } static int printVersion = 0; struct lgetopt myopts[] = { {"configfile", &ConfigFileEntry.configfile, STRING, "File to use for ircd.conf"}, {"logfile", &logFileName, STRING, "File to use for ircd.log"}, {"pidfile", &pidFileName, STRING, "File to use for process ID"}, {"foreground", &server_state_foreground, YESNO, "Run in foreground (don't detach)"}, {"version", &printVersion, YESNO, "Print version and exit"}, {"conftest", &testing_conf, YESNO, "Test the configuration files and exit"}, {"help", NULL, USAGE, "Print this text"}, {NULL, NULL, STRING, NULL}, }; static void check_rehash(void *unused) { /* * Check to see whether we have to rehash the configuration .. */ if(dorehash) { rehash(true); dorehash = false; } if(dorehashbans) { rehash_bans(); dorehashbans = false; } if(doremotd) { sendto_realops_snomask(SNO_GENERAL, L_ALL, "Got signal SIGUSR1, reloading ircd motd file"); cache_user_motd(); doremotd = false; } } /* * initalialize_global_set_options * * inputs - none * output - none * side effects - This sets all global set options needed */ static void initialize_global_set_options(void) { memset(&GlobalSetOptions, 0, sizeof(GlobalSetOptions)); /* memset( &ConfigFileEntry, 0, sizeof(ConfigFileEntry)); */ GlobalSetOptions.maxclients = ServerInfo.default_max_clients; if(GlobalSetOptions.maxclients > (maxconnections - MAX_BUFFER) || (GlobalSetOptions.maxclients <= 0)) GlobalSetOptions.maxclients = maxconnections - MAX_BUFFER; GlobalSetOptions.autoconn = 1; GlobalSetOptions.spam_time = MIN_JOIN_LEAVE_TIME; GlobalSetOptions.spam_num = MAX_JOIN_LEAVE_COUNT; GlobalSetOptions.floodcount = ConfigFileEntry.default_floodcount; split_servers = ConfigChannel.default_split_server_count; split_users = ConfigChannel.default_split_user_count; if(split_users && split_servers && (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split)) { splitmode = 1; splitchecking = 1; } GlobalSetOptions.ident_timeout = ConfigFileEntry.default_ident_timeout; rb_strlcpy(GlobalSetOptions.operstring, ConfigFileEntry.default_operstring, sizeof(GlobalSetOptions.operstring)); rb_strlcpy(GlobalSetOptions.adminstring, ConfigFileEntry.default_adminstring, sizeof(GlobalSetOptions.adminstring)); /* memset( &ConfigChannel, 0, sizeof(ConfigChannel)); */ /* End of global set options */ } /* * initialize_server_capabs * * inputs - none * output - none */ static void initialize_server_capabs(void) { default_server_capabs &= ~CAP_ZIP; } #ifdef _WIN32 /* * relocate_paths * * inputs - none * output - none * side effects - items in ircd_paths[] array are relocated */ static void relocate_paths(void) { char prefix[PATH_MAX], workbuf[PATH_MAX]; char *p; rb_strlcpy(prefix, rb_path_to_self(), sizeof prefix); ircd_paths[IRCD_PATH_IRCD_EXEC] = rb_strdup(prefix); /* if we're running from inside the source tree, we probably do not want to relocate any other paths */ if (strstr(prefix, ".libs") != NULL) return; /* prefix = /home/kaniini/ircd/bin/ircd */ p = strrchr(prefix, RB_PATH_SEPARATOR); if (rb_unlikely(p == NULL)) return; *p = 0; /* prefix = /home/kaniini/ircd/bin */ p = strrchr(prefix, RB_PATH_SEPARATOR); if (rb_unlikely(p == NULL)) return; *p = 0; /* prefix = /home/kaniini/ircd */ ircd_paths[IRCD_PATH_PREFIX] = rb_strdup(prefix); /* now that we have our prefix, we can relocate the other paths... */ snprintf(workbuf, sizeof workbuf, "%s%cmodules", prefix, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_MODULES] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cmodules%cautoload", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_AUTOLOAD_MODULES] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc", prefix, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_ETC] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%clog", prefix, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_LOG] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%chelp%cusers", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_USERHELP] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%chelp%copers", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_OPERHELP] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc%circd.conf", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_IRCD_CONF] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc%circd.motd", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_IRCD_MOTD] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc%copers.motd", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_IRCD_OMOTD] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc%cban.db", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_BANDB] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cetc%circd.pid", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_IRCD_PID] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%clogs%circd.log", prefix, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_IRCD_LOG] = rb_strdup(workbuf); snprintf(workbuf, sizeof workbuf, "%s%cbin", prefix, RB_PATH_SEPARATOR); ircd_paths[IRCD_PATH_BIN] = rb_strdup(workbuf); ircd_paths[IRCD_PATH_LIBEXEC] = rb_strdup(workbuf); inotice("runtime paths:"); for (int i = 0; i < IRCD_PATH_COUNT; i++) { inotice(" %s: %s", ircd_pathnames[i], ircd_paths[i]); } } #endif /* * write_pidfile * * inputs - filename+path of pid file * output - none * side effects - write the pid of the ircd to filename */ static void write_pidfile(const char *filename) { FILE *fb; char buff[32]; if((fb = fopen(filename, "w"))) { unsigned int pid = (unsigned int) getpid(); snprintf(buff, sizeof(buff), "%u\n", pid); if((fputs(buff, fb) == -1)) { ilog(L_MAIN, "Error writing %u to pid file %s (%s)", pid, filename, strerror(errno)); } fclose(fb); return; } else { ilog(L_MAIN, "Error opening pid file %s", filename); } } /* * check_pidfile * * inputs - filename+path of pid file * output - none * side effects - reads pid from pidfile and checks if ircd is in process * list. if it is, gracefully exits * -kre */ static void check_pidfile(const char *filename) { FILE *fb; char buff[32]; pid_t pidfromfile; /* Don't do logging here, since we don't have log() initialised */ if((fb = fopen(filename, "r"))) { if(fgets(buff, 20, fb) != NULL) { pidfromfile = atoi(buff); if(!rb_kill(pidfromfile, 0)) { printf("ircd: daemon is already running\n"); exit(-1); } } fclose(fb); } } /* * setup_corefile * * inputs - nothing * output - nothing * side effects - setups corefile to system limits. * -kre */ static void setup_corefile(void) { #ifdef HAVE_SYS_RESOURCE_H struct rlimit rlim; /* resource limits */ /* Set corefilesize to maximum */ if(!getrlimit(RLIMIT_CORE, &rlim)) { rlim.rlim_cur = rlim.rlim_max; setrlimit(RLIMIT_CORE, &rlim); } #endif } static void ircd_log_cb(const char *str) { ilog(L_MAIN, "librb reports: %s", str); } static void ircd_restart_cb(const char *str) { inotice("librb has called the restart callback: %s", str); restart(str); } /* * Why EXIT_FAILURE here? * Because if ircd_die_cb() is called it's because of a fatal * error inside libcharybdis, and we don't know how to handle the * exception, so it is logical to return a FAILURE exit code here. * --nenolod */ static void ircd_die_cb(const char *str) { if(str != NULL) { /* Try to get the message out to currently logged in operators. */ sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "librb has called the die callback..aborting: %s", str); inotice("librb has called the die callback..aborting: %s", str); } else inotice("librb has called the die callback..aborting"); unlink(pidFileName); exit(EXIT_FAILURE); } struct ev_entry *check_splitmode_ev = NULL; static int seed_with_urandom(void) { unsigned int seed; int fd; fd = open("/dev/urandom", O_RDONLY); if(fd >= 0) { if(read(fd, &seed, sizeof(seed)) == sizeof(seed)) { close(fd); srand(seed); return 1; } close(fd); } return 0; } static void seed_with_clock(void) { const struct timeval *tv; rb_set_time(); tv = rb_current_time_tv(); srand(tv->tv_sec ^ (tv->tv_usec | (getpid() << 20))); } static void seed_random(void *unused) { unsigned int seed; if(rb_get_random(&seed, sizeof(seed)) == -1) { if(!seed_with_urandom()) seed_with_clock(); return; } srand(seed); } /* * main * * Initializes the IRCd. * * Inputs - number of commandline args, args themselves * Outputs - none * Side Effects - this is where the ircd gets going right now */ int charybdis_main(int argc, char * const argv[]) { int fd; #ifndef _WIN32 /* Check to see if the user is running us as root, which is a nono */ if(geteuid() == 0) { fprintf(stderr, "Don't run ircd as root!!!\n"); return -1; } #endif #ifdef _WIN32 relocate_paths(); #endif logFileName = ircd_paths[IRCD_PATH_IRCD_LOG]; pidFileName = ircd_paths[IRCD_PATH_IRCD_PID]; ConfigFileEntry.dpath = ircd_paths[IRCD_PATH_PREFIX]; ConfigFileEntry.configfile = ircd_paths[IRCD_PATH_IRCD_CONF]; /* Server configuration file */ ConfigFileEntry.connect_timeout = 30; /* Default to 30 */ init_sys(); umask(077); /* better safe than sorry --SRB */ myargv = argv; parseargs(&argc, &argv, myopts); if(chdir(ConfigFileEntry.dpath)) { fprintf(stderr, "Unable to chdir to %s: %s\n", ConfigFileEntry.dpath, strerror(errno)); exit(EXIT_FAILURE); } rb_set_time(); /* * Setup corefile size immediately after boot -kre */ setup_corefile(); /* initialise operhash fairly early. */ init_operhash(); memset(&me, 0, sizeof(me)); memset(&meLocalUser, 0, sizeof(meLocalUser)); me.localClient = &meLocalUser; /* Make sure all lists are zeroed */ memset(&unknown_list, 0, sizeof(unknown_list)); memset(&lclient_list, 0, sizeof(lclient_list)); memset(&serv_list, 0, sizeof(serv_list)); memset(&global_serv_list, 0, sizeof(global_serv_list)); memset(&local_oper_list, 0, sizeof(local_oper_list)); memset(&oper_list, 0, sizeof(oper_list)); rb_dlinkAddTail(&me, &me.node, &global_client_list); memset(&Count, 0, sizeof(Count)); memset(&ServerInfo, 0, sizeof(ServerInfo)); memset(&AdminInfo, 0, sizeof(AdminInfo)); memset(&ServerStats, 0, sizeof(struct ServerStatistics)); if(printVersion) { printf("ircd: version %s(%s)\n", ircd_version, serno); #ifdef CUSTOM_BRANDING printf("ircd: based on %s-%s\n", PACKAGE_NAME, PACKAGE_VERSION); #endif printf("ircd: %s\n", rb_lib_version()); exit(EXIT_SUCCESS); } setup_signals(); if (testing_conf) server_state_foreground = true; #ifndef _WIN32 /* Make sure fd 0, 1 and 2 are in use -- jilles */ do { fd = open("/dev/null", O_RDWR); } while (fd < 2 && fd != -1); if (fd > 2) close(fd); else if (fd == -1) exit(1); #endif /* Check if there is pidfile and daemon already running */ if(!testing_conf) { check_pidfile(pidFileName); if(!server_state_foreground) make_daemon(); inotice("starting %s ...", ircd_version); inotice("%s", rb_lib_version()); } /* Init the event subsystem */ rb_lib_init(ircd_log_cb, ircd_restart_cb, ircd_die_cb, !server_state_foreground, maxconnections, DNODE_HEAP_SIZE, FD_HEAP_SIZE); rb_linebuf_init(LINEBUF_HEAP_SIZE); rb_init_prng(NULL, RB_PRNG_DEFAULT); seed_random(NULL); init_builtin_capabs(); default_server_capabs = CAP_MASK; init_main_logfile(); newconf_init(); init_s_conf(); init_s_newconf(); init_hash(); clear_scache_hash_table(); /* server cache name table */ init_host_hash(); clear_hash_parse(); init_client(); init_hook(); init_channels(); initclass(); whowas_init(); init_reject(); init_cache(); init_monitor(); chmode_init(); init_authd(); /* Start up authd. */ init_dns(); /* Start up DNS query system */ init_modules(); /* Start up modules system */ privilegeset_set_new("default", "", 0); if (testing_conf) fprintf(stderr, "\nBeginning config test\n"); read_conf_files(true); /* cold start init conf files */ load_all_modules(1); load_core_modules(1); init_isupport(); init_bandb(); init_ssld(); init_wsockd(); rehash_bans(); initialize_server_capabs(); /* Set up default_server_capabs */ initialize_global_set_options(); if(ServerInfo.name == NULL) { ierror("no server name specified in serverinfo block."); return -1; } rb_strlcpy(me.name, ServerInfo.name, sizeof(me.name)); if(ServerInfo.sid[0] == '\0') { ierror("no server sid specified in serverinfo block."); return -2; } rb_strlcpy(me.id, ServerInfo.sid, sizeof(me.id)); init_uid(); /* serverinfo{} description must exist. If not, error out. */ if(ServerInfo.description == NULL) { ierror("no server description specified in serverinfo block."); return -3; } rb_strlcpy(me.info, ServerInfo.description, sizeof(me.info)); if(ServerInfo.ssl_cert != NULL) { /* just do the rb_setup_ssl_server to validate the config */ if(!rb_setup_ssl_server(ServerInfo.ssl_cert, ServerInfo.ssl_private_key, ServerInfo.ssl_dh_params, ServerInfo.ssl_cipher_list)) { ilog(L_MAIN, "WARNING: Unable to setup SSL."); ircd_ssl_ok = false; } else ircd_ssl_ok = true; } if (testing_conf) { fprintf(stderr, "\nConfig testing complete.\n"); fflush(stderr); return 0; /* Why? We want the launcher to exit out. */ } me.from = &me; me.servptr = &me; SetMe(&me); make_server(&me); startup_time = rb_current_time(); add_to_client_hash(me.name, &me); add_to_id_hash(me.id, &me); me.serv->nameinfo = scache_connect(me.name, me.info, 0); rb_dlinkAddAlloc(&me, &global_serv_list); construct_umodebuf(); check_class(); write_pidfile(pidFileName); load_help(); open_logfiles(); configure_authd(); ilog(L_MAIN, "Server Ready"); /* We want try_connections to be called as soon as possible now! -- adrian */ /* No, 'cause after a restart it would cause all sorts of nick collides */ /* um. by waiting even longer, that just means we have even *more* * nick collisions. what a stupid idea. set an event for the IO loop --fl */ rb_event_addish("try_connections", try_connections, NULL, STARTUP_CONNECTIONS_TIME); rb_event_addonce("try_connections_startup", try_connections, NULL, 2); rb_event_add("check_rehash", check_rehash, NULL, 3); rb_event_addish("reseed_srand", seed_random, NULL, 300); /* reseed every 10 minutes */ if(splitmode) check_splitmode_ev = rb_event_add("check_splitmode", check_splitmode, NULL, 5); print_startup(getpid()); rb_lib_loop(0); return 0; }