2 * IRC - Internet Relay Chat, ircd/ircd.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 1, or (at your option)
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include "ircd_alloc.h"
30 #include "ircd_reply.h"
31 #include "ircd_signal.h"
32 #include "ircd_string.h"
61 #include <sys/socket.h>
67 /*----------------------------------------------------------------------------
69 *--------------------------------------------------------------------------*/
70 extern void init_counters(void);
72 /*----------------------------------------------------------------------------
74 *--------------------------------------------------------------------------*/
81 /*----------------------------------------------------------------------------
83 *--------------------------------------------------------------------------*/
84 struct Client me; // That's me
85 struct Client *GlobalClientList = &me; // Pointer to beginning of Client list
86 time_t TSoffset = 0; // Offset of timestamps to system clock
87 int GlobalRehashFlag = 0; // do a rehash if set
88 int GlobalRestartFlag = 0; // do a restart if set
89 time_t CurrentTime; // Updated every time we leave select()
91 char *configfile = CPATH; // Server configuration file
92 int debuglevel = -1; // Server debug level
93 char *debugmode = ""; // Server debug level
94 static char *dpath = DPATH;
96 time_t nextconnect = 1; // time for next try_connections call
97 time_t nextping = 1; // same as above for check_pings()
99 static struct Daemon thisServer = { 0 }; // server process info
103 /*----------------------------------------------------------------------------
105 *--------------------------------------------------------------------------*/
106 void server_die(const char* message) {
107 ircd_log(L_CRIT, "Server terminating: %s", message);
108 sendto_opmask_butone(0, SNO_OLDSNO, "Server terminating: %s", message);
109 flush_connections(0);
110 close_connections(1);
111 thisServer.running = 0;
115 /*----------------------------------------------------------------------------
116 * API: server_restart
117 *--------------------------------------------------------------------------*/
118 void server_restart(const char* message) {
119 static int restarting = 0;
121 ircd_log(L_WARNING, "Restarting Server: %s", message);
125 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
126 Debug((DEBUG_NOTICE, "Restarting server..."));
127 flush_connections(0);
130 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
132 execv(SPATH, thisServer.argv);
134 /* Have to reopen since it has been closed above */
135 open_log(*thisServer.argv);
136 ircd_log(L_CRIT, "execv(%s,%s) failed: %m\n", SPATH, *thisServer.argv);
138 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
139 SPATH, (strerror(errno)) ? strerror(errno) : ""));
144 /*----------------------------------------------------------------------------
145 * outofmemory: Handler for out of memory conditions...
146 *--------------------------------------------------------------------------*/
147 static void outofmemory(void) {
148 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
149 server_restart("Out of Memory");
153 /*----------------------------------------------------------------------------
155 *--------------------------------------------------------------------------*/
156 static void write_pidfile(void) {
159 if (!(pidf = fopen(PPATH, "w+"))) {
161 "Error opening pid file \"%s\": %s", PPATH, strerror(errno)));
165 if (fprintf(pidf, "%5d\n", getpid()) < 5)
166 Debug((DEBUG_NOTICE, "Error writing to pid file %s", PPATH));
172 /*----------------------------------------------------------------------------
175 * Scan through configuration and try new connections.
177 * Returns the calendar time when the next call to this
178 * function should be made latest. (No harm done if this
179 * is called earlier or later...)
180 *--------------------------------------------------------------------------*/
181 static time_t try_connections(void) {
182 struct ConfItem* aconf;
184 struct ConfItem** pconf;
188 struct ConfClass* cltmp;
189 struct ConfItem* con_conf = 0;
191 unsigned int con_class = 0;
194 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
195 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
196 /* Also when already connecting! (update holdtimes) --SRB */
197 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
200 /* Also skip juped servers */
201 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
204 /* Skip this entry if the use of it is still on hold until
205 * future. Otherwise handle this entry (and set it on hold until next
206 * time). Will reset only hold times, if already made one successfull
207 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
209 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
214 cltmp = aconf->confClass;
215 confrq = get_con_freq(cltmp);
216 aconf->hold = CurrentTime + confrq;
218 /* Found a CONNECT config with port specified, scan clients and see if
219 * this server is already connected?
221 cptr = FindServer(aconf->name);
223 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
224 (!connecting || (ConClass(cltmp) > con_class))) {
226 * Check connect rules to see if we're allowed to try
228 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
229 con_class = ConClass(cltmp);
231 /* We connect only one at time... */
235 if ((next > aconf->hold) || (next == 0))
239 if (con_conf->next) { /* are we already last? */
240 /* Put the current one at the end and make sure we try all connections */
241 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
242 if (aconf == con_conf)
243 *pconf = aconf->next;
244 (*pconf = con_conf)->next = 0;
247 if (connect_server(con_conf, 0, 0))
248 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
252 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
257 /*----------------------------------------------------------------------------
260 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
261 * get right down to it. Can't really be done until the server is more
262 * modular, however...
263 *--------------------------------------------------------------------------*/
264 static time_t check_pings(void) {
266 int next_check = CurrentTime + PINGFREQUENCY;
270 /* Scan through the client table */
271 for (i=0; i <= HighestFd; i++) {
272 struct Client *cptr = LocalClientArray[i];
277 assert(&me != cptr); /* I should never be in the local client array! */
280 /* Remove dead clients. */
282 exit_client(cptr, cptr, &me, cptr->info);
286 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) : CONNECTTIMEOUT;
288 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
289 cptr->name, (cptr->flags & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
290 max_ping, (int)(CurrentTime - cptr->lasttime)));
293 /* Ok, the thing that will happen most frequently, is that someone will
294 * have sent something recently. Cover this first for speed.
296 if (CurrentTime-cptr->lasttime < max_ping) {
297 expire = cptr->lasttime + max_ping;
298 if (expire < next_check)
303 /* Quit the client after max_ping*2 - they should have answered by now */
304 if (CurrentTime-cptr->lasttime >= (max_ping*2) ) {
305 /* If it was a server, then tell ops about it. */
306 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
307 sendto_opmask_butone(0, SNO_OLDSNO,
308 "No response from %s, closing link", cptr->name);
309 exit_client_msg(cptr, cptr, &me, "Ping timeout");
313 /* Unregistered clients pingout after max_ping seconds, they don't
314 * get given a second chance - if they were then people could not quite
315 * finish registration and hold resources without being subject to k/g
318 if (!IsRegistered(cptr)) {
319 /* Display message if they have sent a NICK and a USER but no
322 if (*cptr->name && cptr->user && *cptr->user->username) {
323 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
324 ":Your client may not be compatible with this server.");
325 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
326 ":Compatible clients are available at "
327 "ftp://ftp.undernet.org/pub/irc/clients");
329 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
333 if (!(cptr->flags & FLAGS_PINGSENT)) {
334 /* If we havent PINGed the connection and we havent heard from it in a
335 * while, PING it to make sure it is still alive.
337 cptr->flags |= FLAGS_PINGSENT;
339 /* If we're late in noticing don't hold it against them :) */
340 cptr->lasttime = CurrentTime - max_ping;
343 sendrawto_one(cptr, MSG_PING " :%s", me.name);
345 sendcmdto_one(&me, CMD_PING, cptr, ":%s", me.name);
348 expire = cptr->lasttime + max_ping * 2;
349 if (expire < next_check)
353 assert(next_check >= CurrentTime);
355 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
356 CurrentTime, next_check-CurrentTime));
362 /*----------------------------------------------------------------------------
364 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
366 *--------------------------------------------------------------------------*/
367 static void parse_command_line(int argc, char** argv) {
368 const char *options = "d:f:h:ntvx:";
371 if (thisServer.euid != thisServer.uid)
372 setuid(thisServer.uid);
374 /* Do we really need to santiy check the non-NULLness of optarg? That's
375 * getopt()'s job... Removing those... -zs
377 while ((opt = getopt(argc, argv, options)) != EOF)
380 case 't': thisServer.bootopt |= BOOT_TTY; break;
381 case 'd': dpath = optarg; break;
382 case 'f': configfile = optarg; break;
383 case 'h': ircd_strncpy(me.name, optarg, HOSTLEN); break;
384 case 'v': printf("ircd %s\n", version); exit(0);
387 debuglevel = atoi(optarg);
391 thisServer.bootopt |= BOOT_DEBUG;
395 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
396 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
397 printf("Server not started.\n");
403 /*----------------------------------------------------------------------------
405 *--------------------------------------------------------------------------*/
406 static void daemon_init(int no_fork) {
407 if (!init_connection_limits())
410 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
421 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
422 ioctl(fd, TIOCNOTTY, 0);
432 /*----------------------------------------------------------------------------
434 *--------------------------------------------------------------------------*/
435 static void event_loop(void) {
436 time_t nextdnscheck = 0;
439 thisServer.running = 1;
440 while (thisServer.running) {
441 /* We only want to connect if a connection is due, not every time through.
442 * Note, if there are no active C lines, this call to Tryconnections is
443 * made once only; it will return 0. - avalon
445 if (nextconnect && CurrentTime >= nextconnect)
446 nextconnect = try_connections();
448 /* DNS checks. One to timeout queries, one for cache expiries. */
449 nextdnscheck = timeout_resolver(CurrentTime);
451 /* Take the smaller of the two 'timed' event times as the time of next
452 * event (stops us being late :) - avalon
453 * WARNING - nextconnect can return 0!
456 delay = IRCD_MIN(nextping, nextconnect);
460 delay = IRCD_MIN(nextdnscheck, delay) - CurrentTime;
462 /* Adjust delay to something reasonable [ad hoc values] (one might think
463 * something more clever here... --msa) We don't really need to check that
464 * often and as long as we don't delay too long, everything should be ok.
465 * waiting too long can cause things to timeout... i.e. PINGS -> a
466 * disconnection :( - avalon
471 read_message(IRCD_MIN(delay, TIMESEC));
473 /* ...perhaps should not do these loops every time, but only if there is
474 * some chance of something happening (but, note that conf->hold times may
475 * be changed elsewhere--so precomputed next event time might be too far
476 * away... (similarly with ping times) --msa
478 if (CurrentTime >= nextping)
479 nextping = check_pings();
481 /* timeout pending queries that haven't been responded to */
482 timeout_auth_queries(CurrentTime);
486 if (GlobalRehashFlag) {
488 GlobalRehashFlag = 0;
491 if (GlobalRestartFlag)
492 server_restart("caught signal: SIGINT");
496 /*----------------------------------------------------------------------------
497 * check_file_access: random helper function to make sure that a file is
498 * accessible in a certain way, and complain if not.
499 *--------------------------------------------------------------------------*/
500 static char check_file_access(const char *path, char which, int mode) {
501 if (!access(path, mode))
505 "Check on %cPATH (%s) failed: %s\n"
506 "Please create file and/or rerun `make config' and "
507 "recompile to correct this.\n",
508 which, path, strerror(errno));
511 fprintf(stderr, "Keep in mind that paths are relative to CHROOTDIR.\n");
518 /*----------------------------------------------------------------------------
520 *--------------------------------------------------------------------------*/
521 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
522 static void set_core_limit(void) {
523 struct rlimit corelim;
525 if (getrlimit(RLIMIT_CORE, &corelim)) {
526 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
527 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
530 corelim.rlim_cur = corelim.rlim_max;
531 if (setrlimit(RLIMIT_CORE, &corelim))
532 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
538 /*----------------------------------------------------------------------------
539 * set_chroot_environment
540 *--------------------------------------------------------------------------*/
542 static char set_chroot_environment(void) {
543 /* Must be root to chroot! Silly if you ask me... */
548 fprintf(stderr, "Fail: Cannot chdir(%s): %s\n", dpath, strerror(errno));
552 fprintf(stderr, "Fail: Cannot chroot(%s): %s\n", dpath, strerror(errno));
561 /*----------------------------------------------------------------------------
562 * set_userid_if_needed()
563 *--------------------------------------------------------------------------*/
564 static int set_userid_if_needed(void) {
565 /* TODO: Drop privs correctly! */
566 #if defined(IRC_GID) && defined(IRC_UID)
573 if (getuid() == 0 || geteuid() == 0 ||
574 getgid() == 0 || getegid() == 0) {
575 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
583 /*----------------------------------------------------------------------------
586 * TODO: This should set the basic environment up and start the main loop.
587 * we're doing waaaaaaaaay too much server initialization here. I hate
588 * long and ugly control paths... -smd
589 *--------------------------------------------------------------------------*/
590 int main(int argc, char **argv) {
591 CurrentTime = time(NULL);
593 thisServer.argc = argc;
594 thisServer.argv = argv;
595 thisServer.uid = getuid();
596 thisServer.euid = geteuid();
599 if (!set_chroot_environment())
603 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
607 umask(077); /* better safe than sorry --SRB */
608 memset(&me, 0, sizeof(me));
611 parse_command_line(argc, argv);
614 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
618 if (!set_userid_if_needed())
621 /* Check paths for accessibility */
622 if (!check_file_access(SPATH, 'S', X_OK) ||
623 !check_file_access(configfile, 'C', R_OK) ||
624 !check_file_access(MPATH, 'M', R_OK) ||
625 !check_file_access(RPATH, 'R', R_OK))
629 if (!check_file_access(LPATH, 'L', W_OK))
633 debug_init(thisServer.bootopt & BOOT_TTY);
634 daemon_init(thisServer.bootopt & BOOT_TTY);
639 set_nomem_handler(outofmemory);
641 if (!init_string()) {
642 ircd_log(L_CRIT, "Failed to initialize string module");
657 ircd_log(L_CRIT, "Failed to read configuration file %s", configfile);
661 init_server_identity();
667 rmotd = read_motd(RPATH);
668 motd = read_motd(MPATH);
669 CurrentTime = time(NULL);
675 me.serv->timestamp = TStime(); /* Abuse own link timestamp as start TS */
676 me.serv->prot = atoi(MAJOR_PROTOCOL);
678 me.serv->down = NULL;
679 me.handler = SERVER_HANDLER;
681 SetYXXCapacity(&me, MAXCLIENTS);
683 me.lasttime = me.since = me.firsttime = CurrentTime;
691 Debug((DEBUG_NOTICE, "Server ready..."));
692 ircd_log(L_NOTICE, "Server Ready");