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.
29 #include "destruct_event.h"
31 #include "ircd_alloc.h"
32 #include "ircd_events.h"
33 #include "ircd_features.h"
35 #include "ircd_reply.h"
36 #include "ircd_signal.h"
37 #include "ircd_string.h"
67 #include <sys/socket.h>
69 #include <sys/types.h>
74 /*----------------------------------------------------------------------------
76 *--------------------------------------------------------------------------*/
77 extern void init_counters(void);
79 /*----------------------------------------------------------------------------
81 *--------------------------------------------------------------------------*/
88 /*----------------------------------------------------------------------------
90 *--------------------------------------------------------------------------*/
91 struct Client me; /* That's me */
92 struct Connection me_con; /* That's me too */
93 struct Client *GlobalClientList = &me; /* Pointer to beginning of
95 time_t TSoffset = 0;/* Offset of timestamps to system clock */
96 int GlobalRehashFlag = 0; /* do a rehash if set */
97 int GlobalRestartFlag = 0; /* do a restart if set */
98 time_t CurrentTime; /* Updated every time we leave select() */
100 char *configfile = CPATH; /* Server configuration file */
101 int debuglevel = -1; /* Server debug level */
102 char *debugmode = ""; /* Server debug level */
103 static char *dpath = DPATH;
105 static struct Timer connect_timer; /* timer structure for try_connections() */
106 static struct Timer ping_timer; /* timer structure for check_pings() */
107 static struct Timer destruct_event_timer; /* timer structure for exec_expired_destruct_events() */
109 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
114 /*----------------------------------------------------------------------------
116 *--------------------------------------------------------------------------*/
117 void server_die(const char* message) {
118 /* log_write will send out message to both log file and as server notice */
119 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
120 flush_connections(0);
121 close_connections(1);
126 /*----------------------------------------------------------------------------
127 * API: server_restart
128 *--------------------------------------------------------------------------*/
129 void server_restart(const char* message) {
130 static int restarting = 0;
132 /* inhibit sending any server notices; we may be in a loop */
133 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
135 if (restarting++) /* increment restarting to prevent looping */
138 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
139 Debug((DEBUG_NOTICE, "Restarting server..."));
140 flush_connections(0);
144 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
146 execv(SPATH, thisServer.argv);
148 /* Have to reopen since it has been closed above */
151 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
154 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
155 SPATH, (strerror(errno)) ? strerror(errno) : ""));
160 /*----------------------------------------------------------------------------
161 * outofmemory: Handler for out of memory conditions...
162 *--------------------------------------------------------------------------*/
163 static void outofmemory(void) {
164 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
165 server_restart("Out of Memory");
169 /*----------------------------------------------------------------------------
171 *--------------------------------------------------------------------------*/
172 static void write_pidfile(void) {
175 if (thisServer.pid_fd >= 0) {
176 memset(buff, 0, sizeof(buff));
177 sprintf(buff, "%5d\n", (int)getpid());
178 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
179 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
180 feature_str(FEAT_PPATH)));
183 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
184 feature_str(FEAT_PPATH)));
192 * true - if the pid file exists (and is readable), and the pid refered
193 * to in the file is still running.
196 static int check_pid(void)
200 lock.l_type = F_WRLCK;
202 lock.l_whence = SEEK_SET;
205 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
207 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
213 /*----------------------------------------------------------------------------
216 * Scan through configuration and try new connections.
218 * Returns the calendar time when the next call to this
219 * function should be made latest. (No harm done if this
220 * is called earlier or later...)
221 *--------------------------------------------------------------------------*/
222 static void try_connections(struct Event* ev) {
223 struct ConfItem* aconf;
225 struct ConfItem** pconf;
229 struct ConnectionClass* cltmp;
230 struct ConfItem* con_conf = 0;
232 const char* con_class = NULL;
234 assert(ET_EXPIRE == ev_type(ev));
235 assert(0 != ev_timer(ev));
238 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
239 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
240 /* Also when already connecting! (update holdtimes) --SRB */
241 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
244 /* Also skip juped servers */
245 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
248 /* Skip this entry if the use of it is still on hold until
249 * future. Otherwise handle this entry (and set it on hold until next
250 * time). Will reset only hold times, if already made one successfull
251 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
253 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
258 cltmp = aconf->conn_class;
259 confrq = get_con_freq(cltmp);
260 aconf->hold = CurrentTime + confrq;
262 /* Found a CONNECT config with port specified, scan clients and see if
263 * this server is already connected?
265 cptr = FindServer(aconf->name);
267 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
268 (!connecting /*|| (ConClass(cltmp) > con_class)*/)) {
270 * Check connect rules to see if we're allowed to try
272 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
273 con_class = ConClass(cltmp);
275 /* We connect only one at time... */
279 if ((next > aconf->hold) || (next == 0))
283 if (con_conf->next) { /* are we already last? */
284 /* Put the current one at the end and make sure we try all connections */
285 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
286 if (aconf == con_conf)
287 *pconf = aconf->next;
288 (*pconf = con_conf)->next = 0;
291 if (connect_server(con_conf, 0, 0))
292 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
297 next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
299 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
301 timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
305 /*----------------------------------------------------------------------------
308 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
309 * get right down to it. Can't really be done until the server is more
310 * modular, however...
311 *--------------------------------------------------------------------------*/
312 static void check_pings(struct Event* ev) {
314 int next_check = CurrentTime;
318 assert(ET_EXPIRE == ev_type(ev));
319 assert(0 != ev_timer(ev));
321 next_check += feature_int(FEAT_PINGFREQUENCY);
323 /* Scan through the client table */
324 for (i=0; i <= HighestFd; i++) {
325 struct Client *cptr = LocalClientArray[i];
330 assert(&me != cptr); /* I should never be in the local client array! */
333 /* Remove dead clients. */
335 exit_client(cptr, cptr, &me, cli_info(cptr));
339 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
340 feature_int(FEAT_CONNECTTIMEOUT);
342 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
344 (cli_flags(cptr) & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
345 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
348 /* Ok, the thing that will happen most frequently, is that someone will
349 * have sent something recently. Cover this first for speed.
351 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
352 expire = cli_lasttime(cptr) + max_ping;
353 if (expire < next_check)
358 /* Unregistered clients pingout after max_ping seconds, they don't
359 * get given a second chance - if they were then people could not quite
360 * finish registration and hold resources without being subject to k/g
363 if (!IsRegistered(cptr)) {
364 /* Display message if they have sent a NICK and a USER but no
367 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
368 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
369 ":Your client may not be compatible with this server.");
370 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
371 ":Compatible clients are available at "
374 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
378 if (!(cli_flags(cptr) & FLAGS_PINGSENT)) {
379 /* If we havent PINGed the connection and we havent heard from it in a
380 * while, PING it to make sure it is still alive.
382 cli_flags(cptr) |= FLAGS_PINGSENT;
384 /* If we're late in noticing don't hold it against them :) */
385 cli_lasttime(cptr) = CurrentTime - max_ping;
388 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
390 sendcmdto_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
393 /* Quit the client after max_ping*2 - they should have answered by now */
394 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
395 /* If it was a server, then tell ops about it. */
396 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
397 sendto_opmask_butone(0, SNO_OLDSNO,
398 "No response from %s, closing link",
400 exit_client_msg(cptr, cptr, &me, "Ping timeout");
404 expire = cli_lasttime(cptr) + max_ping * 2;
405 if (expire < next_check)
409 assert(next_check >= CurrentTime);
411 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
412 CurrentTime, next_check-CurrentTime));
414 timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
418 /*----------------------------------------------------------------------------
420 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
422 *--------------------------------------------------------------------------*/
423 static void parse_command_line(int argc, char** argv) {
424 const char *options = "d:f:h:ntvx:";
427 if (thisServer.euid != thisServer.uid)
428 setuid(thisServer.uid);
430 /* Do we really need to santiy check the non-NULLness of optarg? That's
431 * getopt()'s job... Removing those... -zs
433 while ((opt = getopt(argc, argv, options)) != EOF)
436 case 't': thisServer.bootopt |= BOOT_TTY; break;
437 case 'd': dpath = optarg; break;
438 case 'f': configfile = optarg; break;
439 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
440 case 'v': printf("ircd %s\n", version); exit(0);
443 debuglevel = atoi(optarg);
447 thisServer.bootopt |= BOOT_DEBUG;
451 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
452 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
453 printf("Server not started.\n");
459 /*----------------------------------------------------------------------------
461 *--------------------------------------------------------------------------*/
462 static void daemon_init(int no_fork) {
463 if (!init_connection_limits())
466 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
477 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
478 ioctl(fd, TIOCNOTTY, 0);
487 /*----------------------------------------------------------------------------
488 * check_file_access: random helper function to make sure that a file is
489 * accessible in a certain way, and complain if not.
490 *--------------------------------------------------------------------------*/
491 static char check_file_access(const char *path, char which, int mode) {
492 if (!access(path, mode))
496 "Check on %cPATH (%s) failed: %s\n"
497 "Please create this file and/or rerun `configure' "
498 "using --with-%cpath and recompile to correct this.\n",
499 which, path, strerror(errno), which);
505 /*----------------------------------------------------------------------------
507 *--------------------------------------------------------------------------*/
508 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
509 static void set_core_limit(void) {
510 struct rlimit corelim;
512 if (getrlimit(RLIMIT_CORE, &corelim)) {
513 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
514 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
517 corelim.rlim_cur = corelim.rlim_max;
518 if (setrlimit(RLIMIT_CORE, &corelim))
519 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
525 /*----------------------------------------------------------------------------
526 * set_userid_if_needed()
527 *--------------------------------------------------------------------------*/
528 static int set_userid_if_needed(void) {
529 if (getuid() == 0 || geteuid() == 0 ||
530 getgid() == 0 || getegid() == 0) {
531 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
539 /*----------------------------------------------------------------------------
542 * TODO: This should set the basic environment up and start the main loop.
543 * we're doing waaaaaaaaay too much server initialization here. I hate
544 * long and ugly control paths... -smd
545 *--------------------------------------------------------------------------*/
546 int main(int argc, char **argv) {
547 CurrentTime = time(NULL);
549 thisServer.argc = argc;
550 thisServer.argv = argv;
551 thisServer.uid = getuid();
552 thisServer.euid = geteuid();
554 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
558 umask(077); /* better safe than sorry --SRB */
559 memset(&me, 0, sizeof(me));
560 memset(&me_con, 0, sizeof(me_con));
561 cli_connect(&me) = &me_con;
564 parse_command_line(argc, argv);
567 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
571 if (!set_userid_if_needed())
574 /* Check paths for accessibility */
575 if (!check_file_access(SPATH, 'S', X_OK) ||
576 !check_file_access(configfile, 'C', R_OK))
579 debug_init(thisServer.bootopt & BOOT_TTY);
580 daemon_init(thisServer.bootopt & BOOT_TTY);
581 event_init(MAXCONNECTIONS);
584 feature_init(); /* initialize features... */
587 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
590 set_nomem_handler(outofmemory);
592 if (!init_string()) {
593 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
610 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
615 init_server_identity();
620 timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
621 timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
622 timer_add(timer_init(&destruct_event_timer), exec_expired_destruct_events, 0, TT_PERIODIC, 60);
624 CurrentTime = time(NULL);
627 cli_magic(&me) = CLIENT_MAGIC;
631 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
632 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
633 cli_serv(&me)->up = &me;
634 cli_serv(&me)->down = NULL;
635 cli_handler(&me) = SERVER_HANDLER;
637 SetYXXCapacity(&me, MAXCLIENTS);
639 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
646 Debug((DEBUG_NOTICE, "Server ready..."));
647 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");