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"
68 #include <sys/socket.h>
70 #include <sys/types.h>
75 /*----------------------------------------------------------------------------
77 *--------------------------------------------------------------------------*/
78 extern void init_counters(void);
79 extern void mem_dbg_initialise(void);
81 /*----------------------------------------------------------------------------
83 *--------------------------------------------------------------------------*/
90 /*----------------------------------------------------------------------------
92 *--------------------------------------------------------------------------*/
93 struct Client me; /* That's me */
94 struct Connection me_con; /* That's me too */
95 struct Client *GlobalClientList = &me; /* Pointer to beginning of
97 time_t TSoffset = 0;/* Offset of timestamps to system clock */
98 int GlobalRehashFlag = 0; /* do a rehash if set */
99 int GlobalRestartFlag = 0; /* do a restart if set */
100 time_t CurrentTime; /* Updated every time we leave select() */
102 char *configfile = CPATH; /* Server configuration file */
103 int debuglevel = -1; /* Server debug level */
104 char *debugmode = ""; /* Server debug level */
105 static char *dpath = DPATH;
107 static struct Timer connect_timer; /* timer structure for try_connections() */
108 static struct Timer ping_timer; /* timer structure for check_pings() */
109 static struct Timer destruct_event_timer; /* timer structure for exec_expired_destruct_events() */
111 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
116 /*----------------------------------------------------------------------------
118 *--------------------------------------------------------------------------*/
119 void server_die(const char *message)
121 /* log_write will send out message to both log file and as server notice */
122 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
123 flush_connections(0);
124 close_connections(1);
128 /*----------------------------------------------------------------------------
130 *--------------------------------------------------------------------------*/
131 void server_panic(const char *message)
133 /* inhibit sending server notice--we may be panicing due to low memory */
134 log_write(LS_SYSTEM, L_CRIT, LOG_NOSNOTICE, "Server panic: %s", message);
135 flush_connections(0);
137 close_connections(1);
141 /*----------------------------------------------------------------------------
142 * API: server_restart
143 *--------------------------------------------------------------------------*/
144 void server_restart(const char *message)
146 static int restarting = 0;
148 /* inhibit sending any server notices; we may be in a loop */
149 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
151 if (restarting++) /* increment restarting to prevent looping */
154 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
155 Debug((DEBUG_NOTICE, "Restarting server..."));
156 flush_connections(0);
160 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
162 execv(SPATH, thisServer.argv);
164 /* Have to reopen since it has been closed above */
167 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
170 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
171 SPATH, (strerror(errno)) ? strerror(errno) : ""));
176 /*----------------------------------------------------------------------------
177 * outofmemory: Handler for out of memory conditions...
178 *--------------------------------------------------------------------------*/
179 static void outofmemory(void) {
180 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
181 server_restart("Out of Memory");
185 /*----------------------------------------------------------------------------
187 *--------------------------------------------------------------------------*/
188 static void write_pidfile(void) {
191 if (thisServer.pid_fd >= 0) {
192 memset(buff, 0, sizeof(buff));
193 sprintf(buff, "%5d\n", (int)getpid());
194 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
195 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
196 feature_str(FEAT_PPATH)));
199 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
200 feature_str(FEAT_PPATH)));
208 * true - if the pid file exists (and is readable), and the pid refered
209 * to in the file is still running.
212 static int check_pid(void)
216 lock.l_type = F_WRLCK;
218 lock.l_whence = SEEK_SET;
221 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
223 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
229 /*----------------------------------------------------------------------------
232 * Scan through configuration and try new connections.
234 * Returns the calendar time when the next call to this
235 * function should be made latest. (No harm done if this
236 * is called earlier or later...)
237 *--------------------------------------------------------------------------*/
238 static void try_connections(struct Event* ev) {
239 struct ConfItem* aconf;
241 struct ConfItem** pconf;
245 struct ConnectionClass* cltmp;
246 struct ConfItem* con_conf = 0;
248 const char* con_class = NULL;
250 assert(ET_EXPIRE == ev_type(ev));
251 assert(0 != ev_timer(ev));
254 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
255 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
256 /* Also when already connecting! (update holdtimes) --SRB */
257 if (!(aconf->status & CONF_SERVER) || aconf->port == 0 || aconf->hold == 0)
260 /* Also skip juped servers */
261 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
264 /* Skip this entry if the use of it is still on hold until
265 * future. Otherwise handle this entry (and set it on hold until next
266 * time). Will reset only hold times, if already made one successfull
267 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
269 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
274 cltmp = aconf->conn_class;
275 confrq = get_con_freq(cltmp);
277 aconf->hold = next = 0;
279 aconf->hold = CurrentTime + confrq;
281 /* Found a CONNECT config with port specified, scan clients and see if
282 * this server is already connected?
284 cptr = FindServer(aconf->name);
286 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
287 (!connecting /*|| (ConClass(cltmp) > con_class)*/)) {
289 * Check connect rules to see if we're allowed to try
291 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
292 con_class = ConClass(cltmp);
294 /* We connect only one at time... */
298 if ((next > aconf->hold) || (next == 0))
302 if (con_conf->next) { /* are we already last? */
303 /* Put the current one at the end and make sure we try all connections */
304 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
305 if (aconf == con_conf)
306 *pconf = aconf->next;
307 (*pconf = con_conf)->next = 0;
310 if (connect_server(con_conf, 0, 0))
311 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
316 next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
318 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
320 timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
324 /*----------------------------------------------------------------------------
327 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
328 * get right down to it. Can't really be done until the server is more
329 * modular, however...
330 *--------------------------------------------------------------------------*/
331 static void check_pings(struct Event* ev) {
333 int next_check = CurrentTime;
337 assert(ET_EXPIRE == ev_type(ev));
338 assert(0 != ev_timer(ev));
340 next_check += feature_int(FEAT_PINGFREQUENCY);
342 /* Scan through the client table */
343 for (i=0; i <= HighestFd; i++) {
344 struct Client *cptr = LocalClientArray[i];
349 assert(&me != cptr); /* I should never be in the local client array! */
352 /* Remove dead clients. */
354 exit_client(cptr, cptr, &me, cli_info(cptr));
358 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
359 feature_int(FEAT_CONNECTTIMEOUT);
361 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
363 IsPingSent(cptr) ? "[Ping Sent]" : "[]",
364 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
367 /* Ok, the thing that will happen most frequently, is that someone will
368 * have sent something recently. Cover this first for speed.
370 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
371 expire = cli_lasttime(cptr) + max_ping;
372 if (expire < next_check)
377 /* Quit the client after max_ping*2 - they should have answered by now */
378 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) )
380 /* If it was a server, then tell ops about it. */
381 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
382 sendto_opmask_butone(0, SNO_OLDSNO,
383 "No response from %s, closing link",
385 exit_client_msg(cptr, cptr, &me, "Ping timeout");
389 /* Unregistered clients pingout after max_ping seconds, they don't
390 * get given a second chance - if they were then people could not quite
391 * finish registration and hold resources without being subject to k/g
394 if (!IsRegistered(cptr))
396 /* Display message if they have sent a NICK and a USER but no
399 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username)
401 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
402 ":Your client may not be compatible with this server.");
403 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
404 ":Compatible clients are available at %s",
405 feature_str(FEAT_URL_CLIENTS));
407 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
411 if (!IsPingSent(cptr))
413 /* If we havent PINGed the connection and we havent heard from it in a
414 * while, PING it to make sure it is still alive.
418 /* If we're late in noticing don't hold it against them :) */
419 cli_lasttime(cptr) = CurrentTime - max_ping;
422 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
425 char *asll_ts = militime_float(NULL);
426 sendcmdto_one(&me, CMD_PING, cptr, "!%s %s %s", asll_ts,
427 cli_name(cptr), asll_ts);
431 expire = cli_lasttime(cptr) + max_ping * 2;
432 if (expire < next_check)
436 assert(next_check >= CurrentTime);
438 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
439 CurrentTime, next_check-CurrentTime));
441 timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
445 /*----------------------------------------------------------------------------
447 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
449 *--------------------------------------------------------------------------*/
450 static void parse_command_line(int argc, char** argv) {
451 const char *options = "d:f:h:ntvx:";
454 if (thisServer.euid != thisServer.uid)
455 setuid(thisServer.uid);
457 /* Do we really need to santiy check the non-NULLness of optarg? That's
458 * getopt()'s job... Removing those... -zs
460 while ((opt = getopt(argc, argv, options)) != EOF)
463 case 't': thisServer.bootopt |= BOOT_TTY; break;
464 case 'd': dpath = optarg; break;
465 case 'f': configfile = optarg; break;
466 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
468 printf("ircd %s\n", version);
469 printf("Event engines: ");
474 printf("/dev/poll ");
481 printf("\nCompiled for a maximum of %d connections.\n", MAXCONNECTIONS);
488 debuglevel = atoi(optarg);
492 thisServer.bootopt |= BOOT_DEBUG;
496 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
497 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
498 printf("Server not started.\n");
504 /*----------------------------------------------------------------------------
506 *--------------------------------------------------------------------------*/
507 static void daemon_init(int no_fork) {
508 if (!init_connection_limits())
511 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
522 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
523 ioctl(fd, TIOCNOTTY, 0);
532 /*----------------------------------------------------------------------------
533 * check_file_access: random helper function to make sure that a file is
534 * accessible in a certain way, and complain if not.
535 *--------------------------------------------------------------------------*/
536 static char check_file_access(const char *path, char which, int mode) {
537 if (!access(path, mode))
541 "Check on %cPATH (%s) failed: %s\n"
542 "Please create this file and/or rerun `configure' "
543 "using --with-%cpath and recompile to correct this.\n",
544 which, path, strerror(errno), which);
550 /*----------------------------------------------------------------------------
552 *--------------------------------------------------------------------------*/
553 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
554 static void set_core_limit(void) {
555 struct rlimit corelim;
557 if (getrlimit(RLIMIT_CORE, &corelim)) {
558 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
559 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
562 corelim.rlim_cur = corelim.rlim_max;
563 if (setrlimit(RLIMIT_CORE, &corelim))
564 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
570 /*----------------------------------------------------------------------------
571 * set_userid_if_needed()
572 *--------------------------------------------------------------------------*/
573 static int set_userid_if_needed(void) {
574 if (getuid() == 0 || geteuid() == 0 ||
575 getgid() == 0 || getegid() == 0) {
576 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
584 /*----------------------------------------------------------------------------
587 * TODO: This should set the basic environment up and start the main loop.
588 * we're doing waaaaaaaaay too much server initialization here. I hate
589 * long and ugly control paths... -smd
590 *--------------------------------------------------------------------------*/
591 int main(int argc, char **argv) {
592 CurrentTime = time(NULL);
594 thisServer.argc = argc;
595 thisServer.argv = argv;
596 thisServer.uid = getuid();
597 thisServer.euid = geteuid();
600 mem_dbg_initialise();
603 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
607 umask(077); /* better safe than sorry --SRB */
608 memset(&me, 0, sizeof(me));
609 memset(&me_con, 0, sizeof(me_con));
610 cli_connect(&me) = &me_con;
613 parse_command_line(argc, argv);
616 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
620 if (!set_userid_if_needed())
623 /* Check paths for accessibility */
624 if (!check_file_access(SPATH, 'S', X_OK) ||
625 !check_file_access(configfile, 'C', R_OK))
628 debug_init(thisServer.bootopt & BOOT_TTY);
629 daemon_init(thisServer.bootopt & BOOT_TTY);
630 event_init(MAXCONNECTIONS);
633 feature_init(); /* initialize features... */
636 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
639 set_nomem_handler(outofmemory);
641 if (!init_string()) {
642 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
659 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
664 init_server_identity();
669 timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
670 timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
671 timer_add(timer_init(&destruct_event_timer), exec_expired_destruct_events, 0, TT_PERIODIC, 60);
673 CurrentTime = time(NULL);
676 cli_magic(&me) = CLIENT_MAGIC;
680 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
681 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
682 cli_serv(&me)->up = &me;
683 cli_serv(&me)->down = NULL;
684 cli_handler(&me) = SERVER_HANDLER;
686 SetYXXCapacity(&me, MAXCLIENTS);
688 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
695 Debug((DEBUG_NOTICE, "Server ready..."));
696 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");