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"
29 #include "ircd_features.h"
31 #include "ircd_reply.h"
32 #include "ircd_signal.h"
33 #include "ircd_string.h"
63 #include <sys/socket.h>
65 #include <sys/types.h>
70 /*----------------------------------------------------------------------------
72 *--------------------------------------------------------------------------*/
73 extern void init_counters(void);
75 /*----------------------------------------------------------------------------
77 *--------------------------------------------------------------------------*/
84 /*----------------------------------------------------------------------------
86 *--------------------------------------------------------------------------*/
87 struct Client me; // That's me
88 struct Connection me_con; // That's me too
89 struct Client *GlobalClientList = &me; // Pointer to beginning of Client list
90 time_t TSoffset = 0; // Offset of timestamps to system clock
91 int GlobalRehashFlag = 0; // do a rehash if set
92 int GlobalRestartFlag = 0; // do a restart if set
93 time_t CurrentTime; // Updated every time we leave select()
95 char *configfile = CPATH; // Server configuration file
96 int debuglevel = -1; // Server debug level
97 char *debugmode = ""; // Server debug level
98 static char *dpath = DPATH;
100 time_t nextconnect = 1; // time for next try_connections call
101 time_t nextping = 1; // same as above for check_pings()
103 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
107 /*----------------------------------------------------------------------------
109 *--------------------------------------------------------------------------*/
110 void server_die(const char* message) {
111 /* log_write will send out message to both log file and as server notice */
112 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
113 flush_connections(0);
114 close_connections(1);
115 thisServer.running = 0;
119 /*----------------------------------------------------------------------------
120 * API: server_restart
121 *--------------------------------------------------------------------------*/
122 void server_restart(const char* message) {
123 static int restarting = 0;
125 /* inhibit sending any server notices; we may be in a loop */
126 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
128 if (restarting++) /* increment restarting to prevent looping */
131 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
132 Debug((DEBUG_NOTICE, "Restarting server..."));
133 flush_connections(0);
137 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
139 execv(SPATH, thisServer.argv);
141 /* Have to reopen since it has been closed above */
144 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
147 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
148 SPATH, (strerror(errno)) ? strerror(errno) : ""));
153 /*----------------------------------------------------------------------------
154 * outofmemory: Handler for out of memory conditions...
155 *--------------------------------------------------------------------------*/
156 static void outofmemory(void) {
157 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
158 server_restart("Out of Memory");
162 /*----------------------------------------------------------------------------
164 *--------------------------------------------------------------------------*/
165 static void write_pidfile(void) {
168 if (thisServer.pid_fd >= 0) {
169 memset(buff, 0, sizeof(buff));
170 sprintf(buff, "%5d\n", (int)getpid());
171 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
172 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
173 feature_str(FEAT_PPATH)));
176 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
177 feature_str(FEAT_PPATH)));
185 * true - if the pid file exists (and is readable), and the pid refered
186 * to in the file is still running.
189 static int check_pid(void)
193 lock.l_type = F_WRLCK;
195 lock.l_whence = SEEK_SET;
198 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
200 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
206 /*----------------------------------------------------------------------------
209 * Scan through configuration and try new connections.
211 * Returns the calendar time when the next call to this
212 * function should be made latest. (No harm done if this
213 * is called earlier or later...)
214 *--------------------------------------------------------------------------*/
215 static time_t try_connections(void) {
216 struct ConfItem* aconf;
218 struct ConfItem** pconf;
222 struct ConnectionClass* cltmp;
223 struct ConfItem* con_conf = 0;
225 unsigned int con_class = 0;
228 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
229 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
230 /* Also when already connecting! (update holdtimes) --SRB */
231 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
234 /* Also skip juped servers */
235 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
238 /* Skip this entry if the use of it is still on hold until
239 * future. Otherwise handle this entry (and set it on hold until next
240 * time). Will reset only hold times, if already made one successfull
241 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
243 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
248 cltmp = aconf->conn_class;
249 confrq = get_con_freq(cltmp);
250 aconf->hold = CurrentTime + confrq;
252 /* Found a CONNECT config with port specified, scan clients and see if
253 * this server is already connected?
255 cptr = FindServer(aconf->name);
257 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
258 (!connecting || (ConClass(cltmp) > con_class))) {
260 * Check connect rules to see if we're allowed to try
262 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
263 con_class = ConClass(cltmp);
265 /* We connect only one at time... */
269 if ((next > aconf->hold) || (next == 0))
273 if (con_conf->next) { /* are we already last? */
274 /* Put the current one at the end and make sure we try all connections */
275 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
276 if (aconf == con_conf)
277 *pconf = aconf->next;
278 (*pconf = con_conf)->next = 0;
281 if (connect_server(con_conf, 0, 0))
282 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
286 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
291 /*----------------------------------------------------------------------------
294 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
295 * get right down to it. Can't really be done until the server is more
296 * modular, however...
297 *--------------------------------------------------------------------------*/
298 static time_t check_pings(void) {
300 int next_check = CurrentTime;
304 next_check += feature_int(FEAT_PINGFREQUENCY);
306 /* Scan through the client table */
307 for (i=0; i <= HighestFd; i++) {
308 struct Client *cptr = LocalClientArray[i];
313 assert(&me != cptr); /* I should never be in the local client array! */
316 /* Remove dead clients. */
318 exit_client(cptr, cptr, &me, cli_info(cptr));
322 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
323 feature_int(FEAT_CONNECTTIMEOUT);
325 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
326 cli_name(cptr), (cli_flags(cptr) & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
327 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
330 /* Ok, the thing that will happen most frequently, is that someone will
331 * have sent something recently. Cover this first for speed.
333 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
334 expire = cli_lasttime(cptr) + max_ping;
335 if (expire < next_check)
340 /* Quit the client after max_ping*2 - they should have answered by now */
341 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
342 /* If it was a server, then tell ops about it. */
343 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
344 sendto_opmask_butone(0, SNO_OLDSNO,
345 "No response from %s, closing link", cli_name(cptr));
346 exit_client_msg(cptr, cptr, &me, "Ping timeout");
350 /* Unregistered clients pingout after max_ping seconds, they don't
351 * get given a second chance - if they were then people could not quite
352 * finish registration and hold resources without being subject to k/g
355 if (!IsRegistered(cptr)) {
356 /* Display message if they have sent a NICK and a USER but no
359 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
360 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
361 ":Your client may not be compatible with this server.");
362 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
363 ":Compatible clients are available at "
364 "ftp://ftp.undernet.org/pub/irc/clients");
366 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
370 if (!(cli_flags(cptr) & FLAGS_PINGSENT)) {
371 /* If we havent PINGed the connection and we havent heard from it in a
372 * while, PING it to make sure it is still alive.
374 cli_flags(cptr) |= FLAGS_PINGSENT;
376 /* If we're late in noticing don't hold it against them :) */
377 cli_lasttime(cptr) = CurrentTime - max_ping;
380 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
382 sendcmdto_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
385 expire = cli_lasttime(cptr) + max_ping * 2;
386 if (expire < next_check)
390 assert(next_check >= CurrentTime);
392 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
393 CurrentTime, next_check-CurrentTime));
399 /*----------------------------------------------------------------------------
401 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
403 *--------------------------------------------------------------------------*/
404 static void parse_command_line(int argc, char** argv) {
405 const char *options = "d:f:h:ntvx:";
408 if (thisServer.euid != thisServer.uid)
409 setuid(thisServer.uid);
411 /* Do we really need to santiy check the non-NULLness of optarg? That's
412 * getopt()'s job... Removing those... -zs
414 while ((opt = getopt(argc, argv, options)) != EOF)
417 case 't': thisServer.bootopt |= BOOT_TTY; break;
418 case 'd': dpath = optarg; break;
419 case 'f': configfile = optarg; break;
420 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
421 case 'v': printf("ircd %s\n", version); exit(0);
424 debuglevel = atoi(optarg);
428 thisServer.bootopt |= BOOT_DEBUG;
432 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
433 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
434 printf("Server not started.\n");
440 /*----------------------------------------------------------------------------
442 *--------------------------------------------------------------------------*/
443 static void daemon_init(int no_fork) {
444 if (!init_connection_limits())
447 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
458 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
459 ioctl(fd, TIOCNOTTY, 0);
469 /*----------------------------------------------------------------------------
471 *--------------------------------------------------------------------------*/
472 static void event_loop(void) {
473 time_t nextdnscheck = 0;
476 thisServer.running = 1;
477 while (thisServer.running) {
478 /* We only want to connect if a connection is due, not every time through.
479 * Note, if there are no active C lines, this call to Tryconnections is
480 * made once only; it will return 0. - avalon
482 if (nextconnect && CurrentTime >= nextconnect)
483 nextconnect = try_connections();
485 /* DNS checks. One to timeout queries, one for cache expiries. */
486 nextdnscheck = timeout_resolver(CurrentTime);
488 /* Take the smaller of the two 'timed' event times as the time of next
489 * event (stops us being late :) - avalon
490 * WARNING - nextconnect can return 0!
493 delay = IRCD_MIN(nextping, nextconnect);
497 delay = IRCD_MIN(nextdnscheck, delay) - CurrentTime;
499 /* Adjust delay to something reasonable [ad hoc values] (one might think
500 * something more clever here... --msa) We don't really need to check that
501 * often and as long as we don't delay too long, everything should be ok.
502 * waiting too long can cause things to timeout... i.e. PINGS -> a
503 * disconnection :( - avalon
508 read_message(IRCD_MIN(delay, feature_int(FEAT_TIMESEC)));
510 /* ...perhaps should not do these loops every time, but only if there is
511 * some chance of something happening (but, note that conf->hold times may
512 * be changed elsewhere--so precomputed next event time might be too far
513 * away... (similarly with ping times) --msa
515 if (CurrentTime >= nextping)
516 nextping = check_pings();
518 /* timeout pending queries that haven't been responded to */
519 timeout_auth_queries(CurrentTime);
523 if (GlobalRehashFlag) {
525 GlobalRehashFlag = 0;
528 if (GlobalRestartFlag)
529 server_restart("caught signal: SIGINT");
533 /*----------------------------------------------------------------------------
534 * check_file_access: random helper function to make sure that a file is
535 * accessible in a certain way, and complain if not.
536 *--------------------------------------------------------------------------*/
537 static char check_file_access(const char *path, char which, int mode) {
538 if (!access(path, mode))
542 "Check on %cPATH (%s) failed: %s\n"
543 "Please create file and/or rerun `make config' and "
544 "recompile to correct this.\n",
545 which, path, strerror(errno));
548 fprintf(stderr, "Keep in mind that paths are relative to CHROOTDIR.\n");
555 /*----------------------------------------------------------------------------
557 *--------------------------------------------------------------------------*/
558 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
559 static void set_core_limit(void) {
560 struct rlimit corelim;
562 if (getrlimit(RLIMIT_CORE, &corelim)) {
563 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
564 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
567 corelim.rlim_cur = corelim.rlim_max;
568 if (setrlimit(RLIMIT_CORE, &corelim))
569 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
575 /*----------------------------------------------------------------------------
576 * set_chroot_environment
577 *--------------------------------------------------------------------------*/
579 static char set_chroot_environment(void) {
580 /* Must be root to chroot! Silly if you ask me... */
585 fprintf(stderr, "Fail: Cannot chdir(%s): %s\n", dpath, strerror(errno));
589 fprintf(stderr, "Fail: Cannot chroot(%s): %s\n", dpath, strerror(errno));
598 /*----------------------------------------------------------------------------
599 * set_userid_if_needed()
600 *--------------------------------------------------------------------------*/
601 static int set_userid_if_needed(void) {
602 /* TODO: Drop privs correctly! */
603 #if defined(IRC_GID) && defined(IRC_UID)
610 if (getuid() == 0 || geteuid() == 0 ||
611 getgid() == 0 || getegid() == 0) {
612 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
620 /*----------------------------------------------------------------------------
623 * TODO: This should set the basic environment up and start the main loop.
624 * we're doing waaaaaaaaay too much server initialization here. I hate
625 * long and ugly control paths... -smd
626 *--------------------------------------------------------------------------*/
627 int main(int argc, char **argv) {
628 CurrentTime = time(NULL);
630 thisServer.argc = argc;
631 thisServer.argv = argv;
632 thisServer.uid = getuid();
633 thisServer.euid = geteuid();
636 if (!set_chroot_environment())
640 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
644 umask(077); /* better safe than sorry --SRB */
645 memset(&me, 0, sizeof(me));
646 memset(&me_con, 0, sizeof(me_con));
647 cli_connect(&me) = &me_con;
650 parse_command_line(argc, argv);
653 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
657 if (!set_userid_if_needed())
660 /* Check paths for accessibility */
661 if (!check_file_access(SPATH, 'S', X_OK) ||
662 !check_file_access(configfile, 'C', R_OK))
666 if (!check_file_access(LPATH, 'L', W_OK))
670 debug_init(thisServer.bootopt & BOOT_TTY);
671 daemon_init(thisServer.bootopt & BOOT_TTY);
674 feature_init(); /* initialize features... */
677 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
680 set_nomem_handler(outofmemory);
682 if (!init_string()) {
683 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
700 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
705 init_server_identity();
709 CurrentTime = time(NULL);
715 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
716 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
717 cli_serv(&me)->up = &me;
718 cli_serv(&me)->down = NULL;
719 cli_handler(&me) = SERVER_HANDLER;
721 SetYXXCapacity(&me, MAXCLIENTS);
723 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
730 Debug((DEBUG_NOTICE, "Server ready..."));
731 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");