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.
30 #include "ircd_alloc.h"
31 #include "ircd_features.h"
33 #include "ircd_reply.h"
34 #include "ircd_signal.h"
35 #include "ircd_string.h"
65 #include <sys/socket.h>
67 #include <sys/types.h>
72 /*----------------------------------------------------------------------------
74 *--------------------------------------------------------------------------*/
75 extern void init_counters(void);
77 /*----------------------------------------------------------------------------
79 *--------------------------------------------------------------------------*/
86 /*----------------------------------------------------------------------------
88 *--------------------------------------------------------------------------*/
89 struct Client me; /* That's me */
90 struct Connection me_con; /* That's me too */
91 struct Client *GlobalClientList = &me; /* Pointer to beginning of
93 time_t TSoffset = 0;/* Offset of timestamps to system clock */
94 int GlobalRehashFlag = 0; /* do a rehash if set */
95 int GlobalRestartFlag = 0; /* do a restart if set */
96 time_t CurrentTime; /* Updated every time we leave select() */
98 char *configfile = CPATH; /* Server configuration file */
99 int debuglevel = -1; /* Server debug level */
100 char *debugmode = ""; /* Server debug level */
101 static char *dpath = DPATH;
103 time_t nextconnect = 1; /* time for next try_connections call */
104 time_t nextping = 1; /* same as above for check_pings() */
106 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
110 /*----------------------------------------------------------------------------
112 *--------------------------------------------------------------------------*/
113 void server_die(const char* message) {
114 /* log_write will send out message to both log file and as server notice */
115 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
116 flush_connections(0);
117 close_connections(1);
118 thisServer.running = 0;
122 /*----------------------------------------------------------------------------
123 * API: server_restart
124 *--------------------------------------------------------------------------*/
125 void server_restart(const char* message) {
126 static int restarting = 0;
128 /* inhibit sending any server notices; we may be in a loop */
129 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
131 if (restarting++) /* increment restarting to prevent looping */
134 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
135 Debug((DEBUG_NOTICE, "Restarting server..."));
136 flush_connections(0);
140 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
142 execv(SPATH, thisServer.argv);
144 /* Have to reopen since it has been closed above */
147 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
150 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
151 SPATH, (strerror(errno)) ? strerror(errno) : ""));
156 /*----------------------------------------------------------------------------
157 * outofmemory: Handler for out of memory conditions...
158 *--------------------------------------------------------------------------*/
159 static void outofmemory(void) {
160 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
161 server_restart("Out of Memory");
165 /*----------------------------------------------------------------------------
167 *--------------------------------------------------------------------------*/
168 static void write_pidfile(void) {
171 if (thisServer.pid_fd >= 0) {
172 memset(buff, 0, sizeof(buff));
173 sprintf(buff, "%5d\n", (int)getpid());
174 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
175 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
176 feature_str(FEAT_PPATH)));
179 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
180 feature_str(FEAT_PPATH)));
188 * true - if the pid file exists (and is readable), and the pid refered
189 * to in the file is still running.
192 static int check_pid(void)
196 lock.l_type = F_WRLCK;
198 lock.l_whence = SEEK_SET;
201 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
203 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
209 /*----------------------------------------------------------------------------
212 * Scan through configuration and try new connections.
214 * Returns the calendar time when the next call to this
215 * function should be made latest. (No harm done if this
216 * is called earlier or later...)
217 *--------------------------------------------------------------------------*/
218 static time_t try_connections(void) {
219 struct ConfItem* aconf;
221 struct ConfItem** pconf;
225 struct ConnectionClass* cltmp;
226 struct ConfItem* con_conf = 0;
228 unsigned int con_class = 0;
231 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
232 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
233 /* Also when already connecting! (update holdtimes) --SRB */
234 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
237 /* Also skip juped servers */
238 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
241 /* Skip this entry if the use of it is still on hold until
242 * future. Otherwise handle this entry (and set it on hold until next
243 * time). Will reset only hold times, if already made one successfull
244 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
246 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
251 cltmp = aconf->conn_class;
252 confrq = get_con_freq(cltmp);
253 aconf->hold = CurrentTime + confrq;
255 /* Found a CONNECT config with port specified, scan clients and see if
256 * this server is already connected?
258 cptr = FindServer(aconf->name);
260 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
261 (!connecting || (ConClass(cltmp) > con_class))) {
263 * Check connect rules to see if we're allowed to try
265 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
266 con_class = ConClass(cltmp);
268 /* We connect only one at time... */
272 if ((next > aconf->hold) || (next == 0))
276 if (con_conf->next) { /* are we already last? */
277 /* Put the current one at the end and make sure we try all connections */
278 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
279 if (aconf == con_conf)
280 *pconf = aconf->next;
281 (*pconf = con_conf)->next = 0;
284 if (connect_server(con_conf, 0, 0))
285 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
289 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
294 /*----------------------------------------------------------------------------
297 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
298 * get right down to it. Can't really be done until the server is more
299 * modular, however...
300 *--------------------------------------------------------------------------*/
301 static time_t check_pings(void) {
303 int next_check = CurrentTime;
307 next_check += feature_int(FEAT_PINGFREQUENCY);
309 /* Scan through the client table */
310 for (i=0; i <= HighestFd; i++) {
311 struct Client *cptr = LocalClientArray[i];
316 assert(&me != cptr); /* I should never be in the local client array! */
319 /* Remove dead clients. */
321 exit_client(cptr, cptr, &me, cli_info(cptr));
325 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
326 feature_int(FEAT_CONNECTTIMEOUT);
328 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
329 cli_name(cptr), (cli_flags(cptr) & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
330 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
333 /* Ok, the thing that will happen most frequently, is that someone will
334 * have sent something recently. Cover this first for speed.
336 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
337 expire = cli_lasttime(cptr) + max_ping;
338 if (expire < next_check)
343 /* Quit the client after max_ping*2 - they should have answered by now */
344 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
345 /* If it was a server, then tell ops about it. */
346 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
347 sendto_opmask_butone(0, SNO_OLDSNO,
348 "No response from %s, closing link", cli_name(cptr));
349 exit_client_msg(cptr, cptr, &me, "Ping timeout");
353 /* Unregistered clients pingout after max_ping seconds, they don't
354 * get given a second chance - if they were then people could not quite
355 * finish registration and hold resources without being subject to k/g
358 if (!IsRegistered(cptr)) {
359 /* Display message if they have sent a NICK and a USER but no
362 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
363 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
364 ":Your client may not be compatible with this server.");
365 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
366 ":Compatible clients are available at "
367 "ftp://ftp.undernet.org/pub/irc/clients");
369 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
373 if (!(cli_flags(cptr) & FLAGS_PINGSENT)) {
374 /* If we havent PINGed the connection and we havent heard from it in a
375 * while, PING it to make sure it is still alive.
377 cli_flags(cptr) |= FLAGS_PINGSENT;
379 /* If we're late in noticing don't hold it against them :) */
380 cli_lasttime(cptr) = CurrentTime - max_ping;
383 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
385 sendcmdto_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
388 expire = cli_lasttime(cptr) + max_ping * 2;
389 if (expire < next_check)
393 assert(next_check >= CurrentTime);
395 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
396 CurrentTime, next_check-CurrentTime));
402 /*----------------------------------------------------------------------------
404 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
406 *--------------------------------------------------------------------------*/
407 static void parse_command_line(int argc, char** argv) {
408 const char *options = "d:f:h:ntvx:";
411 if (thisServer.euid != thisServer.uid)
412 setuid(thisServer.uid);
414 /* Do we really need to santiy check the non-NULLness of optarg? That's
415 * getopt()'s job... Removing those... -zs
417 while ((opt = getopt(argc, argv, options)) != EOF)
420 case 't': thisServer.bootopt |= BOOT_TTY; break;
421 case 'd': dpath = optarg; break;
422 case 'f': configfile = optarg; break;
423 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
424 case 'v': printf("ircd %s\n", version); exit(0);
427 debuglevel = atoi(optarg);
431 thisServer.bootopt |= BOOT_DEBUG;
435 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
436 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
437 printf("Server not started.\n");
443 /*----------------------------------------------------------------------------
445 *--------------------------------------------------------------------------*/
446 static void daemon_init(int no_fork) {
447 if (!init_connection_limits())
450 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
461 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
462 ioctl(fd, TIOCNOTTY, 0);
472 /*----------------------------------------------------------------------------
474 *--------------------------------------------------------------------------*/
475 static void event_loop(void) {
476 time_t nextdnscheck = 0;
479 thisServer.running = 1;
480 while (thisServer.running) {
481 /* We only want to connect if a connection is due, not every time through.
482 * Note, if there are no active C lines, this call to Tryconnections is
483 * made once only; it will return 0. - avalon
485 if (nextconnect && CurrentTime >= nextconnect)
486 nextconnect = try_connections();
488 /* DNS checks. One to timeout queries, one for cache expiries. */
489 nextdnscheck = timeout_resolver(CurrentTime);
491 /* Take the smaller of the two 'timed' event times as the time of next
492 * event (stops us being late :) - avalon
493 * WARNING - nextconnect can return 0!
496 delay = IRCD_MIN(nextping, nextconnect);
500 delay = IRCD_MIN(nextdnscheck, delay) - CurrentTime;
502 /* Adjust delay to something reasonable [ad hoc values] (one might think
503 * something more clever here... --msa) We don't really need to check that
504 * often and as long as we don't delay too long, everything should be ok.
505 * waiting too long can cause things to timeout... i.e. PINGS -> a
506 * disconnection :( - avalon
511 read_message(IRCD_MIN(delay, feature_int(FEAT_TIMESEC)));
513 /* ...perhaps should not do these loops every time, but only if there is
514 * some chance of something happening (but, note that conf->hold times may
515 * be changed elsewhere--so precomputed next event time might be too far
516 * away... (similarly with ping times) --msa
518 if (CurrentTime >= nextping)
519 nextping = check_pings();
521 /* timeout pending queries that haven't been responded to */
522 timeout_auth_queries(CurrentTime);
526 if (GlobalRehashFlag) {
528 GlobalRehashFlag = 0;
531 if (GlobalRestartFlag)
532 server_restart("caught signal: SIGINT");
536 /*----------------------------------------------------------------------------
537 * check_file_access: random helper function to make sure that a file is
538 * accessible in a certain way, and complain if not.
539 *--------------------------------------------------------------------------*/
540 static char check_file_access(const char *path, char which, int mode) {
541 if (!access(path, mode))
545 "Check on %cPATH (%s) failed: %s\n"
546 "Please create file and/or rerun `make config' and "
547 "recompile to correct this.\n",
548 which, path, strerror(errno));
551 fprintf(stderr, "Keep in mind that paths are relative to CHROOTDIR.\n");
558 /*----------------------------------------------------------------------------
560 *--------------------------------------------------------------------------*/
561 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
562 static void set_core_limit(void) {
563 struct rlimit corelim;
565 if (getrlimit(RLIMIT_CORE, &corelim)) {
566 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
567 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
570 corelim.rlim_cur = corelim.rlim_max;
571 if (setrlimit(RLIMIT_CORE, &corelim))
572 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
578 /*----------------------------------------------------------------------------
579 * set_chroot_environment
580 *--------------------------------------------------------------------------*/
582 static char set_chroot_environment(void) {
583 /* Must be root to chroot! Silly if you ask me... */
588 fprintf(stderr, "Fail: Cannot chdir(%s): %s\n", dpath, strerror(errno));
592 fprintf(stderr, "Fail: Cannot chroot(%s): %s\n", dpath, strerror(errno));
601 /*----------------------------------------------------------------------------
602 * set_userid_if_needed()
603 *--------------------------------------------------------------------------*/
604 static int set_userid_if_needed(void) {
605 /* TODO: Drop privs correctly! */
606 #if defined(IRC_GID) && defined(IRC_UID)
613 if (getuid() == 0 || geteuid() == 0 ||
614 getgid() == 0 || getegid() == 0) {
615 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
623 /*----------------------------------------------------------------------------
626 * TODO: This should set the basic environment up and start the main loop.
627 * we're doing waaaaaaaaay too much server initialization here. I hate
628 * long and ugly control paths... -smd
629 *--------------------------------------------------------------------------*/
630 int main(int argc, char **argv) {
631 CurrentTime = time(NULL);
633 thisServer.argc = argc;
634 thisServer.argv = argv;
635 thisServer.uid = getuid();
636 thisServer.euid = geteuid();
639 if (!set_chroot_environment())
643 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
647 umask(077); /* better safe than sorry --SRB */
648 memset(&me, 0, sizeof(me));
649 memset(&me_con, 0, sizeof(me_con));
650 cli_connect(&me) = &me_con;
653 parse_command_line(argc, argv);
656 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
660 if (!set_userid_if_needed())
663 /* Check paths for accessibility */
664 if (!check_file_access(SPATH, 'S', X_OK) ||
665 !check_file_access(configfile, 'C', R_OK))
669 if (!check_file_access(LPATH, 'L', W_OK))
673 debug_init(thisServer.bootopt & BOOT_TTY);
674 daemon_init(thisServer.bootopt & BOOT_TTY);
677 feature_init(); /* initialize features... */
680 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
683 set_nomem_handler(outofmemory);
685 if (!init_string()) {
686 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
703 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
708 init_server_identity();
712 CurrentTime = time(NULL);
718 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
719 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
720 cli_serv(&me)->up = &me;
721 cli_serv(&me)->down = NULL;
722 cli_handler(&me) = SERVER_HANDLER;
724 SetYXXCapacity(&me, MAXCLIENTS);
726 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
733 Debug((DEBUG_NOTICE, "Server ready..."));
734 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");