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);
78 extern void mem_dbg_initialise(void);
80 /*----------------------------------------------------------------------------
82 *--------------------------------------------------------------------------*/
89 /*----------------------------------------------------------------------------
91 *--------------------------------------------------------------------------*/
92 struct Client me; /* That's me */
93 struct Connection me_con; /* That's me too */
94 struct Client *GlobalClientList = &me; /* Pointer to beginning of
96 time_t TSoffset = 0;/* Offset of timestamps to system clock */
97 int GlobalRehashFlag = 0; /* do a rehash if set */
98 int GlobalRestartFlag = 0; /* do a restart if set */
99 time_t CurrentTime; /* Updated every time we leave select() */
101 char *configfile = CPATH; /* Server configuration file */
102 int debuglevel = -1; /* Server debug level */
103 char *debugmode = ""; /* Server debug level */
104 static char *dpath = DPATH;
106 static struct Timer connect_timer; /* timer structure for try_connections() */
107 static struct Timer ping_timer; /* timer structure for check_pings() */
108 static struct Timer destruct_event_timer; /* timer structure for exec_expired_destruct_events() */
110 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
115 /*----------------------------------------------------------------------------
117 *--------------------------------------------------------------------------*/
118 void server_die(const char* message) {
119 /* log_write will send out message to both log file and as server notice */
120 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
121 flush_connections(0);
122 close_connections(1);
127 /*----------------------------------------------------------------------------
128 * API: server_restart
129 *--------------------------------------------------------------------------*/
130 void server_restart(const char* message) {
131 static int restarting = 0;
133 /* inhibit sending any server notices; we may be in a loop */
134 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
136 if (restarting++) /* increment restarting to prevent looping */
139 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
140 Debug((DEBUG_NOTICE, "Restarting server..."));
141 flush_connections(0);
145 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
147 execv(SPATH, thisServer.argv);
149 /* Have to reopen since it has been closed above */
152 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
155 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
156 SPATH, (strerror(errno)) ? strerror(errno) : ""));
161 /*----------------------------------------------------------------------------
162 * outofmemory: Handler for out of memory conditions...
163 *--------------------------------------------------------------------------*/
164 static void outofmemory(void) {
165 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
166 server_restart("Out of Memory");
170 /*----------------------------------------------------------------------------
172 *--------------------------------------------------------------------------*/
173 static void write_pidfile(void) {
176 if (thisServer.pid_fd >= 0) {
177 memset(buff, 0, sizeof(buff));
178 sprintf(buff, "%5d\n", (int)getpid());
179 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
180 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
181 feature_str(FEAT_PPATH)));
184 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
185 feature_str(FEAT_PPATH)));
193 * true - if the pid file exists (and is readable), and the pid refered
194 * to in the file is still running.
197 static int check_pid(void)
201 lock.l_type = F_WRLCK;
203 lock.l_whence = SEEK_SET;
206 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
208 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
214 /*----------------------------------------------------------------------------
217 * Scan through configuration and try new connections.
219 * Returns the calendar time when the next call to this
220 * function should be made latest. (No harm done if this
221 * is called earlier or later...)
222 *--------------------------------------------------------------------------*/
223 static void try_connections(struct Event* ev) {
224 struct ConfItem* aconf;
226 struct ConfItem** pconf;
230 struct ConnectionClass* cltmp;
231 struct ConfItem* con_conf = 0;
233 const char* con_class = NULL;
235 assert(ET_EXPIRE == ev_type(ev));
236 assert(0 != ev_timer(ev));
239 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
240 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
241 /* Also when already connecting! (update holdtimes) --SRB */
242 if (!(aconf->status & CONF_SERVER) || aconf->port == 0 || aconf->hold == 0)
245 /* Also skip juped servers */
246 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
249 /* Skip this entry if the use of it is still on hold until
250 * future. Otherwise handle this entry (and set it on hold until next
251 * time). Will reset only hold times, if already made one successfull
252 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
254 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
259 cltmp = aconf->conn_class;
260 confrq = get_con_freq(cltmp);
262 aconf->hold = next = 0;
264 aconf->hold = CurrentTime + confrq;
266 /* Found a CONNECT config with port specified, scan clients and see if
267 * this server is already connected?
269 cptr = FindServer(aconf->name);
271 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
272 (!connecting /*|| (ConClass(cltmp) > con_class)*/)) {
274 * Check connect rules to see if we're allowed to try
276 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
277 con_class = ConClass(cltmp);
279 /* We connect only one at time... */
283 if ((next > aconf->hold) || (next == 0))
287 if (con_conf->next) { /* are we already last? */
288 /* Put the current one at the end and make sure we try all connections */
289 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
290 if (aconf == con_conf)
291 *pconf = aconf->next;
292 (*pconf = con_conf)->next = 0;
295 if (connect_server(con_conf, 0, 0))
296 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
301 next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
303 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
305 timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
309 /*----------------------------------------------------------------------------
312 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
313 * get right down to it. Can't really be done until the server is more
314 * modular, however...
315 *--------------------------------------------------------------------------*/
316 static void check_pings(struct Event* ev) {
318 int next_check = CurrentTime;
322 assert(ET_EXPIRE == ev_type(ev));
323 assert(0 != ev_timer(ev));
325 next_check += feature_int(FEAT_PINGFREQUENCY);
327 /* Scan through the client table */
328 for (i=0; i <= HighestFd; i++) {
329 struct Client *cptr = LocalClientArray[i];
334 assert(&me != cptr); /* I should never be in the local client array! */
337 /* Remove dead clients. */
339 exit_client(cptr, cptr, &me, cli_info(cptr));
343 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
344 feature_int(FEAT_CONNECTTIMEOUT);
346 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
348 (cli_flags(cptr) & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
349 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
352 /* Ok, the thing that will happen most frequently, is that someone will
353 * have sent something recently. Cover this first for speed.
355 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
356 expire = cli_lasttime(cptr) + max_ping;
357 if (expire < next_check)
362 /* Unregistered clients pingout after max_ping seconds, they don't
363 * get given a second chance - if they were then people could not quite
364 * finish registration and hold resources without being subject to k/g
367 if (!IsRegistered(cptr)) {
368 /* Display message if they have sent a NICK and a USER but no
371 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
372 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
373 ":Your client may not be compatible with this server.");
374 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
375 ":Compatible clients are available at "
378 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
382 if (!(cli_flags(cptr) & FLAGS_PINGSENT)) {
383 /* If we havent PINGed the connection and we havent heard from it in a
384 * while, PING it to make sure it is still alive.
386 cli_flags(cptr) |= FLAGS_PINGSENT;
388 /* If we're late in noticing don't hold it against them :) */
389 cli_lasttime(cptr) = CurrentTime - max_ping;
392 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
394 sendcmdto_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
397 /* Quit the client after max_ping*2 - they should have answered by now */
398 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
399 /* If it was a server, then tell ops about it. */
400 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
401 sendto_opmask_butone(0, SNO_OLDSNO,
402 "No response from %s, closing link",
404 exit_client_msg(cptr, cptr, &me, "Ping timeout");
408 expire = cli_lasttime(cptr) + max_ping * 2;
409 if (expire < next_check)
413 assert(next_check >= CurrentTime);
415 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
416 CurrentTime, next_check-CurrentTime));
418 timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
422 /*----------------------------------------------------------------------------
424 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
426 *--------------------------------------------------------------------------*/
427 static void parse_command_line(int argc, char** argv) {
428 const char *options = "d:f:h:ntvx:";
431 if (thisServer.euid != thisServer.uid)
432 setuid(thisServer.uid);
434 /* Do we really need to santiy check the non-NULLness of optarg? That's
435 * getopt()'s job... Removing those... -zs
437 while ((opt = getopt(argc, argv, options)) != EOF)
440 case 't': thisServer.bootopt |= BOOT_TTY; break;
441 case 'd': dpath = optarg; break;
442 case 'f': configfile = optarg; break;
443 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
445 printf("ircd %s\n", version);
446 printf("Event engines: ");
451 printf("/dev/poll ");
458 printf("\nCompiled for a maximum of %d connections.\n", MAXCONNECTIONS);
465 debuglevel = atoi(optarg);
469 thisServer.bootopt |= BOOT_DEBUG;
473 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
474 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
475 printf("Server not started.\n");
481 /*----------------------------------------------------------------------------
483 *--------------------------------------------------------------------------*/
484 static void daemon_init(int no_fork) {
485 if (!init_connection_limits())
488 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
499 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
500 ioctl(fd, TIOCNOTTY, 0);
509 /*----------------------------------------------------------------------------
510 * check_file_access: random helper function to make sure that a file is
511 * accessible in a certain way, and complain if not.
512 *--------------------------------------------------------------------------*/
513 static char check_file_access(const char *path, char which, int mode) {
514 if (!access(path, mode))
518 "Check on %cPATH (%s) failed: %s\n"
519 "Please create this file and/or rerun `configure' "
520 "using --with-%cpath and recompile to correct this.\n",
521 which, path, strerror(errno), which);
527 /*----------------------------------------------------------------------------
529 *--------------------------------------------------------------------------*/
530 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
531 static void set_core_limit(void) {
532 struct rlimit corelim;
534 if (getrlimit(RLIMIT_CORE, &corelim)) {
535 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
536 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
539 corelim.rlim_cur = corelim.rlim_max;
540 if (setrlimit(RLIMIT_CORE, &corelim))
541 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
547 /*----------------------------------------------------------------------------
548 * set_userid_if_needed()
549 *--------------------------------------------------------------------------*/
550 static int set_userid_if_needed(void) {
551 if (getuid() == 0 || geteuid() == 0 ||
552 getgid() == 0 || getegid() == 0) {
553 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
561 /*----------------------------------------------------------------------------
564 * TODO: This should set the basic environment up and start the main loop.
565 * we're doing waaaaaaaaay too much server initialization here. I hate
566 * long and ugly control paths... -smd
567 *--------------------------------------------------------------------------*/
568 int main(int argc, char **argv) {
569 CurrentTime = time(NULL);
571 thisServer.argc = argc;
572 thisServer.argv = argv;
573 thisServer.uid = getuid();
574 thisServer.euid = geteuid();
577 mem_dbg_initialise();
580 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
584 umask(077); /* better safe than sorry --SRB */
585 memset(&me, 0, sizeof(me));
586 memset(&me_con, 0, sizeof(me_con));
587 cli_connect(&me) = &me_con;
590 parse_command_line(argc, argv);
593 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
597 if (!set_userid_if_needed())
600 /* Check paths for accessibility */
601 if (!check_file_access(SPATH, 'S', X_OK) ||
602 !check_file_access(configfile, 'C', R_OK))
605 debug_init(thisServer.bootopt & BOOT_TTY);
606 daemon_init(thisServer.bootopt & BOOT_TTY);
607 event_init(MAXCONNECTIONS);
610 feature_init(); /* initialize features... */
613 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
616 set_nomem_handler(outofmemory);
618 if (!init_string()) {
619 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
636 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
641 init_server_identity();
646 timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
647 timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
648 timer_add(timer_init(&destruct_event_timer), exec_expired_destruct_events, 0, TT_PERIODIC, 60);
650 CurrentTime = time(NULL);
653 cli_magic(&me) = CLIENT_MAGIC;
657 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
658 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
659 cli_serv(&me)->up = &me;
660 cli_serv(&me)->down = NULL;
661 cli_handler(&me) = SERVER_HANDLER;
663 SetYXXCapacity(&me, MAXCLIENTS);
665 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
672 Debug((DEBUG_NOTICE, "Server ready..."));
673 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");