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.
27 #include "ircd_alloc.h" /* set_nomem_handler */
29 #include "ircd_signal.h"
30 #include "ircd_string.h"
59 #include <sys/socket.h>
64 extern void init_counters(void);
66 struct Client me; /* That's me */
67 struct Client* GlobalClientList = &me; /* Pointer to beginning of Client list */
68 time_t TSoffset = 0; /* Offset of timestamps to system clock */
69 int GlobalRehashFlag = 0; /* do a rehash if set */
70 int GlobalRestartFlag = 0; /* do a restart if set */
71 time_t CurrentTime; /* Updated every time we leave select() */
74 char *configfile = CPATH; /* Server configuration file */
75 int debuglevel = -1; /* Server debug level */
76 unsigned int bootopt = 0; /* Server boot option flags */
77 char *debugmode = ""; /* -"- -"- -"- */
78 static char *dpath = DPATH;
80 time_t nextconnect = 1; /* time for next try_connections call */
81 time_t nextping = 1; /* same as above for check_pings() */
82 time_t nextdnscheck = 0; /* next time to poll dns to force timeouts */
83 time_t nextexpire = 1; /* next expire run on the dns cache */
89 static void server_reboot(const char* message)
93 sendto_ops("Restarting server: %s", message);
94 Debug((DEBUG_NOTICE, "Restarting server..."));
97 * fd 0 must be 'preserved' if either the -d or -i options have
98 * been passed to us before restarting.
102 for (i = 3; i < MAXCONNECTIONS; i++)
104 if (!(bootopt & (BOOT_TTY | BOOT_DEBUG)))
109 execv(SPATH, myargv);
111 /* Have to reopen since it has been closed above */
113 ircd_log(L_CRIT, "execv(%s,%s) failed: %m\n", SPATH, myargv[0]);
115 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
116 SPATH, strerror(errno)));
120 void server_die(const char* message)
122 ircd_log(L_CRIT, "Server terminating: %s", message);
123 sendto_ops("Server terminating: %s", message);
124 flush_connections(0);
128 void server_restart(const char* message)
130 static int restarting = 0;
132 ircd_log(L_WARNING, "Restarting Server: %s", message);
133 if (restarting == 0) {
135 server_reboot(message);
139 static void outofmemory(void)
141 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
142 server_restart("Out of Memory");
145 static void write_pidfile(void)
150 if ((fd = open(PPATH, O_CREAT | O_WRONLY, 0600)) >= 0) {
151 memset(buff, 0, sizeof(buff));
152 sprintf(buff, "%5d\n", (int)getpid());
153 if (write(fd, buff, strlen(buff)) == -1)
154 Debug((DEBUG_NOTICE, "Error writing to pid file %s", PPATH));
158 Debug((DEBUG_NOTICE, "Error opening pid file \"%s\": %s",
159 PPATH, strerror(errno)));
166 * Scan through configuration and try new connections.
168 * Returns the calendar time when the next call to this
169 * function should be made latest. (No harm done if this
170 * is called earlier or later...)
172 static time_t try_connections(void)
174 struct ConfItem *aconf;
176 struct ConfItem **pconf;
177 int connecting, confrq;
179 struct ConfClass *cltmp;
180 struct ConfItem *cconf, *con_conf = NULL;
182 unsigned int con_class = 0;
185 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
186 for (aconf = GlobalConfList; aconf; aconf = aconf->next)
188 /* Also when already connecting! (update holdtimes) --SRB */
189 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
192 /* Also skip juped servers */
193 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
196 cltmp = aconf->confClass;
198 * Skip this entry if the use of it is still on hold until
199 * future. Otherwise handle this entry (and set it on hold
200 * until next time). Will reset only hold times, if already
201 * made one successfull connection... [this algorithm is
202 * a bit fuzzy... -- msa >;) ]
205 if ((aconf->hold > CurrentTime))
207 if ((next > aconf->hold) || (next == 0))
212 confrq = get_con_freq(cltmp);
213 aconf->hold = CurrentTime + confrq;
215 * Found a CONNECT config with port specified, scan clients
216 * and see if this server is already connected?
218 cptr = FindServer(aconf->name);
220 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
221 (!connecting || (ConClass(cltmp) > con_class)))
223 /* Check connect rules to see if we're allowed to try */
224 for (cconf = GlobalConfList; cconf; cconf = cconf->next)
225 if ((cconf->status & CONF_CRULE) &&
226 (match(cconf->host, aconf->name) == 0))
227 if (crule_eval(cconf->passwd))
231 con_class = ConClass(cltmp);
233 /* We connect only one at time... */
237 if ((next > aconf->hold) || (next == 0))
242 if (con_conf->next) /* are we already last? */
244 /* Put the current one at the end and make sure we try all connections */
245 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
246 if (aconf == con_conf)
247 *pconf = aconf->next;
248 (*pconf = con_conf)->next = 0;
250 if (connect_server(con_conf, 0, 0))
251 sendto_ops("Connection to %s activated.", con_conf->name);
253 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
257 static time_t check_pings(void)
262 time_t oldest = CurrentTime + PINGFREQUENCY;
265 for (i = 0; i <= HighestFd; i++) {
266 if (!(cptr = LocalClientArray[i]))
269 * me is never in the local client array
273 * Note: No need to notify opers here.
274 * It's already done when "FLAGS_DEADSOCKET" is set.
277 exit_client(cptr, cptr, &me, LastDeadComment(cptr));
281 ping = IsRegistered(cptr) ? get_client_ping(cptr) : CONNECTTIMEOUT;
282 Debug((DEBUG_DEBUG, "c(%s)=%d p %d a %d",
283 cptr->name, cptr->status, ping,
284 (int)(CurrentTime - cptr->lasttime)));
286 * Ok, so goto's are ugly and can be avoided here but this code
287 * is already indented enough so I think its justified. -avalon
289 if (IsRegistered(cptr) && (ping >= CurrentTime - cptr->lasttime))
292 * If the server hasnt talked to us in 2 * ping seconds
293 * and it has a ping time, then close its connection.
294 * If the client is a user and a KILL line was found
295 * to be active, close this connection too.
297 if (((CurrentTime - cptr->lasttime) >= (2 * ping) && (cptr->flags & FLAGS_PINGSENT)) ||
298 (!IsRegistered(cptr) && !IsHandshake(cptr) && (CurrentTime - cptr->firsttime) >= ping))
300 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
302 sendto_ops("No response from %s, closing link", cptr->name);
303 exit_client(cptr, cptr, &me, "Ping timeout");
307 if (!IsRegistered(cptr) && *cptr->name && *cptr->user->username) {
309 ":%s %d %s :Your client may not be compatible with this server.",
310 me.name, ERR_BADPING, cptr->name);
312 ":%s %d %s :Compatible clients are available at "
313 "ftp://ftp.undernet.org/pub/irc/clients",
314 me.name, ERR_BADPING, cptr->name);
316 exit_client_msg(cptr, cptr, &me, "Ping timeout for %s",
317 get_client_name(cptr, HIDE_IP));
321 else if (IsRegistered(cptr) && 0 == (cptr->flags & FLAGS_PINGSENT)) {
323 * If we havent PINGed the connection and we havent
324 * heard from it in a while, PING it to make sure
327 cptr->flags |= FLAGS_PINGSENT;
329 * not nice but does the job
331 cptr->lasttime = CurrentTime - ping;
333 sendto_one(cptr, "PING :%s", me.name);
335 sendto_one(cptr, "%s " TOK_PING " :%s", NumServ(&me), me.name);
338 timeout = cptr->lasttime + ping;
339 while (timeout <= CurrentTime)
341 if (timeout < oldest)
344 if (oldest < CurrentTime)
345 oldest = CurrentTime + PINGFREQUENCY;
347 "Next check_ping() call at: %s, %d " TIME_T_FMT " " TIME_T_FMT,
348 myctime(oldest), ping, oldest, CurrentTime));
356 * This is called when the commandline is not acceptable.
357 * Give error message and exit without starting anything.
359 static int bad_command(void)
361 printf("Usage: ircd %s[-h servername] [-x loglevel] [-t]\n",
362 #ifdef CMDLINE_CONFIG
368 printf("Server not started\n\n");
372 int main(int argc, char *argv[])
377 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
378 struct rlimit corelim;
381 CurrentTime = time(NULL);
386 if (MAXCONNECTIONS < 64 || MAXCONNECTIONS > 256000) {
387 fprintf(stderr, "%s: MAXCONNECTIONS insane: %d\n", *argv, MAXCONNECTIONS);
394 monstartup(0, etext);
396 signal(SIGUSR1, s_monitor);
402 fprintf(stderr, "Fail: Cannot chdir(%s): %s\n", DPATH, strerror(errno));
407 fprintf(stderr, "Fail: Cannot chroot(%s): %s\n", DPATH, strerror(errno));
411 #endif /*CHROOTDIR */
414 umask(077); /* better safe than sorry --SRB */
415 memset(&me, 0, sizeof(me));
420 memset(&vserv, 0, sizeof(vserv));
427 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
428 if (getrlimit(RLIMIT_CORE, &corelim))
430 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
431 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
433 corelim.rlim_cur = corelim.rlim_max;
434 if (setrlimit(RLIMIT_CORE, &corelim))
435 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
439 * All command line parameters have the syntax "-fstring"
440 * or "-f string" (e.g. the space is optional). String may
441 * be empty. Flag characters cannot be concatenated (like
442 * "-fxyz"), it would conflict with the form "-fstring".
444 while (--argc > 0 && (*++argv)[0] == '-')
446 char *p = argv[0] + 1;
449 if (flag == '\0' || *p == '\0')
451 if (argc > 1 && argv[1][0] != '-')
463 bootopt |= BOOT_QUICK;
470 #ifdef CMDLINE_CONFIG
478 ircd_strncpy(me.name, p, HOSTLEN);
486 printf("ircd %s\n", version);
493 if (!(hep = gethostbyname(p)))
495 fprintf(stderr, "%s: Error creating virtual host \"%s\": %d",
496 argv[0], p, h_errno);
499 if (hep->h_addrtype == AF_INET && hep->h_addr_list[0] &&
500 !hep->h_addr_list[1])
502 memcpy(&vserv.sin_addr, hep->h_addr_list[0], sizeof(struct in_addr));
503 vserv.sin_family = AF_INET;
507 fprintf(stderr, "%s: Error creating virtual host \"%s\": "
508 "Use -w <IP-number of interface>\n", argv[0], p);
519 debuglevel = atoi(p);
520 debugmode = *p ? p : "0";
521 bootopt |= BOOT_DEBUG;
524 fprintf(stderr, "%s: DEBUGMODE must be defined for -x y\n", myargv[0]);
535 fprintf(stderr, "Fail: Cannot chdir(%s): %s\n", dpath, strerror(errno));
540 if ((uid != euid) && !euid)
543 "ERROR: do not run ircd setuid root. Make it setuid a normal user.\n");
548 #if !defined(CHROOTDIR) || (defined(IRC_UID) && defined(IRC_GID))
557 #if defined(IRC_UID) && defined(IRC_GID)
559 /* run as a specified user */
560 fprintf(stderr, "WARNING: running ircd with uid = %d\n", IRC_UID);
561 fprintf(stderr, " changing to gid %d.\n", IRC_GID);
565 /* check for setuid root as usual */
567 "ERROR: do not run ircd setuid root. Make it setuid a normal user.\n");
571 #endif /*CHROOTDIR/UID/GID */
574 return bad_command(); /* This should exit out */
583 if (access(path, X_OK) == 0) {
586 if (access(path, R_OK) == 0) {
589 if (access(path, R_OK) == 0) {
592 if (access(path, R_OK) == 0) {
598 if (access(path, W_OK) == 0)
607 fprintf(stderr, "Check on %cPATH (%s) failed: %s\n",
608 c, path, strerror(errno));
610 "Please create file and/or rerun `make config' and recompile to correct this.\n");
613 "Keep in mind that all paths are relative to CHROOTDIR.\n");
627 set_nomem_handler(outofmemory);
633 if (initconf(bootopt) == -1) {
634 Debug((DEBUG_FATAL, "Failed in reading configuration file %s", configfile));
635 printf("Couldn't open configuration file %s\n", configfile);
638 if (!init_server_identity()) {
639 Debug((DEBUG_FATAL, "Failed to initialize server identity"));
643 rmotd = read_motd(RPATH);
644 motd = read_motd(MPATH);
645 CurrentTime = time(NULL);
650 * Abuse own link timestamp as start timestamp:
652 me.serv->timestamp = TStime();
653 me.serv->prot = atoi(MAJOR_PROTOCOL);
655 me.serv->down = NULL;
656 me.handler = SERVER_HANDLER;
658 SetYXXCapacity(&me, MAXCLIENTS);
660 me.lasttime = me.since = me.firsttime = CurrentTime;
668 Debug((DEBUG_NOTICE, "Server ready..."));
669 ircd_log(L_NOTICE, "Server Ready");
674 * We only want to connect if a connection is due,
675 * not every time through. Note, if there are no
676 * active C lines, this call to Tryconnections is
677 * made once only; it will return 0. - avalon
679 if (nextconnect && CurrentTime >= nextconnect)
680 nextconnect = try_connections();
682 * DNS checks. One to timeout queries, one for cache expiries.
684 nextdnscheck = timeout_resolver(CurrentTime);
686 * Take the smaller of the two 'timed' event times as
687 * the time of next event (stops us being late :) - avalon
688 * WARNING - nextconnect can return 0!
691 delay = IRCD_MIN(nextping, nextconnect);
694 delay = IRCD_MIN(nextdnscheck, delay);
695 delay -= CurrentTime;
697 * Adjust delay to something reasonable [ad hoc values]
698 * (one might think something more clever here... --msa)
699 * We don't really need to check that often and as long
700 * as we don't delay too long, everything should be ok.
701 * waiting too long can cause things to timeout...
702 * i.e. PINGS -> a disconnection :(
708 delay = IRCD_MIN(delay, TIMESEC);
711 Debug((DEBUG_DEBUG, "Got message(s)"));
714 * ...perhaps should not do these loops every time,
715 * but only if there is some chance of something
716 * happening (but, note that conf->hold times may
717 * be changed elsewhere--so precomputed next event
718 * time might be too far away... (similarly with
721 if (CurrentTime >= nextping)
722 nextping = check_pings();
725 * timeout pending queries that haven't been responded to
727 timeout_auth_queries(CurrentTime);
729 if (GlobalRehashFlag) {
731 GlobalRehashFlag = 0;
733 if (GlobalRestartFlag)
734 server_restart("caught signal: SIGINT");