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.
30 #include "ircd_alloc.h"
31 #include "ircd_events.h"
32 #include "ircd_features.h"
34 #include "ircd_reply.h"
35 #include "ircd_signal.h"
36 #include "ircd_string.h"
66 #include <sys/socket.h>
68 #include <sys/types.h>
73 /*----------------------------------------------------------------------------
75 *--------------------------------------------------------------------------*/
76 extern void init_counters(void);
78 /*----------------------------------------------------------------------------
80 *--------------------------------------------------------------------------*/
87 /*----------------------------------------------------------------------------
89 *--------------------------------------------------------------------------*/
90 struct Client me; /* That's me */
91 struct Connection me_con; /* That's me too */
92 struct Client *GlobalClientList = &me; /* Pointer to beginning of
94 time_t TSoffset = 0;/* Offset of timestamps to system clock */
95 int GlobalRehashFlag = 0; /* do a rehash if set */
96 int GlobalRestartFlag = 0; /* do a restart if set */
97 time_t CurrentTime; /* Updated every time we leave select() */
99 char *configfile = CPATH; /* Server configuration file */
100 int debuglevel = -1; /* Server debug level */
101 char *debugmode = ""; /* Server debug level */
102 static char *dpath = DPATH;
104 static struct Timer connect_timer; /* timer structure for try_connections() */
105 static struct Timer ping_timer; /* timer structure for check_pings() */
107 static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
112 /*----------------------------------------------------------------------------
114 *--------------------------------------------------------------------------*/
115 void server_die(const char* message) {
116 /* log_write will send out message to both log file and as server notice */
117 log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
118 flush_connections(0);
119 close_connections(1);
124 /*----------------------------------------------------------------------------
125 * API: server_restart
126 *--------------------------------------------------------------------------*/
127 void server_restart(const char* message) {
128 static int restarting = 0;
130 /* inhibit sending any server notices; we may be in a loop */
131 log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
133 if (restarting++) /* increment restarting to prevent looping */
136 sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
137 Debug((DEBUG_NOTICE, "Restarting server..."));
138 flush_connections(0);
142 close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
144 execv(SPATH, thisServer.argv);
146 /* Have to reopen since it has been closed above */
149 log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
152 Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
153 SPATH, (strerror(errno)) ? strerror(errno) : ""));
158 /*----------------------------------------------------------------------------
159 * outofmemory: Handler for out of memory conditions...
160 *--------------------------------------------------------------------------*/
161 static void outofmemory(void) {
162 Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
163 server_restart("Out of Memory");
167 /*----------------------------------------------------------------------------
169 *--------------------------------------------------------------------------*/
170 static void write_pidfile(void) {
173 if (thisServer.pid_fd >= 0) {
174 memset(buff, 0, sizeof(buff));
175 sprintf(buff, "%5d\n", (int)getpid());
176 if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
177 Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
178 feature_str(FEAT_PPATH)));
181 Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
182 feature_str(FEAT_PPATH)));
190 * true - if the pid file exists (and is readable), and the pid refered
191 * to in the file is still running.
194 static int check_pid(void)
198 lock.l_type = F_WRLCK;
200 lock.l_whence = SEEK_SET;
203 if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
205 return fcntl(thisServer.pid_fd, F_SETLK, &lock);
211 /*----------------------------------------------------------------------------
214 * Scan through configuration and try new connections.
216 * Returns the calendar time when the next call to this
217 * function should be made latest. (No harm done if this
218 * is called earlier or later...)
219 *--------------------------------------------------------------------------*/
220 static void try_connections(struct Event* ev) {
221 struct ConfItem* aconf;
223 struct ConfItem** pconf;
227 struct ConnectionClass* cltmp;
228 struct ConfItem* con_conf = 0;
230 unsigned int con_class = 0;
232 assert(ET_EXPIRE == ev_type(ev));
233 assert(0 != ev_timer(ev));
236 Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
237 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
238 /* Also when already connecting! (update holdtimes) --SRB */
239 if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
242 /* Also skip juped servers */
243 if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
246 /* Skip this entry if the use of it is still on hold until
247 * future. Otherwise handle this entry (and set it on hold until next
248 * time). Will reset only hold times, if already made one successfull
249 * connection... [this algorithm is a bit fuzzy... -- msa >;) ]
251 if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
256 cltmp = aconf->conn_class;
257 confrq = get_con_freq(cltmp);
258 aconf->hold = CurrentTime + confrq;
260 /* Found a CONNECT config with port specified, scan clients and see if
261 * this server is already connected?
263 cptr = FindServer(aconf->name);
265 if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
266 (!connecting || (ConClass(cltmp) > con_class))) {
268 * Check connect rules to see if we're allowed to try
270 if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
271 con_class = ConClass(cltmp);
273 /* We connect only one at time... */
277 if ((next > aconf->hold) || (next == 0))
281 if (con_conf->next) { /* are we already last? */
282 /* Put the current one at the end and make sure we try all connections */
283 for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
284 if (aconf == con_conf)
285 *pconf = aconf->next;
286 (*pconf = con_conf)->next = 0;
289 if (connect_server(con_conf, 0, 0))
290 sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
295 next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
297 Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
299 timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
303 /*----------------------------------------------------------------------------
306 * TODO: This should be moved out of ircd.c. It's protocol-specific when you
307 * get right down to it. Can't really be done until the server is more
308 * modular, however...
309 *--------------------------------------------------------------------------*/
310 static void check_pings(struct Event* ev) {
312 int next_check = CurrentTime;
316 assert(ET_EXPIRE == ev_type(ev));
317 assert(0 != ev_timer(ev));
319 next_check += feature_int(FEAT_PINGFREQUENCY);
321 /* Scan through the client table */
322 for (i=0; i <= HighestFd; i++) {
323 struct Client *cptr = LocalClientArray[i];
328 assert(&me != cptr); /* I should never be in the local client array! */
331 /* Remove dead clients. */
333 exit_client(cptr, cptr, &me, cli_info(cptr));
337 max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
338 feature_int(FEAT_CONNECTTIMEOUT);
340 Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
342 (cli_flags(cptr) & FLAGS_PINGSENT) ? "[Ping Sent]" : "[]",
343 max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
346 /* Ok, the thing that will happen most frequently, is that someone will
347 * have sent something recently. Cover this first for speed.
349 if (CurrentTime-cli_lasttime(cptr) < max_ping) {
350 expire = cli_lasttime(cptr) + max_ping;
351 if (expire < next_check)
356 /* Quit the client after max_ping*2 - they should have answered by now */
357 if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
358 /* If it was a server, then tell ops about it. */
359 if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
360 sendto_opmask_butone(0, SNO_OLDSNO,
361 "No response from %s, closing link",
363 exit_client_msg(cptr, cptr, &me, "Ping timeout");
367 /* Unregistered clients pingout after max_ping seconds, they don't
368 * get given a second chance - if they were then people could not quite
369 * finish registration and hold resources without being subject to k/g
372 if (!IsRegistered(cptr)) {
373 /* Display message if they have sent a NICK and a USER but no
376 if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
377 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
378 ":Your client may not be compatible with this server.");
379 send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
380 ":Compatible clients are available at "
383 exit_client_msg(cptr,cptr,&me, "Ping Timeout");
387 if (!(cli_flags(cptr) & FLAGS_PINGSENT)) {
388 /* If we havent PINGed the connection and we havent heard from it in a
389 * while, PING it to make sure it is still alive.
391 cli_flags(cptr) |= FLAGS_PINGSENT;
393 /* If we're late in noticing don't hold it against them :) */
394 cli_lasttime(cptr) = CurrentTime - max_ping;
397 sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
399 sendcmdto_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
402 expire = cli_lasttime(cptr) + max_ping * 2;
403 if (expire < next_check)
407 assert(next_check >= CurrentTime);
409 Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
410 CurrentTime, next_check-CurrentTime));
412 timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
416 /*----------------------------------------------------------------------------
418 * Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
420 *--------------------------------------------------------------------------*/
421 static void parse_command_line(int argc, char** argv) {
422 const char *options = "d:f:h:ntvx:";
425 if (thisServer.euid != thisServer.uid)
426 setuid(thisServer.uid);
428 /* Do we really need to santiy check the non-NULLness of optarg? That's
429 * getopt()'s job... Removing those... -zs
431 while ((opt = getopt(argc, argv, options)) != EOF)
434 case 't': thisServer.bootopt |= BOOT_TTY; break;
435 case 'd': dpath = optarg; break;
436 case 'f': configfile = optarg; break;
437 case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
438 case 'v': printf("ircd %s\n", version); exit(0);
441 debuglevel = atoi(optarg);
445 thisServer.bootopt |= BOOT_DEBUG;
449 printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv]\n");
450 printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
451 printf("Server not started.\n");
457 /*----------------------------------------------------------------------------
459 *--------------------------------------------------------------------------*/
460 static void daemon_init(int no_fork) {
461 if (!init_connection_limits())
464 close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
475 if ((fd = open("/dev/tty", O_RDWR)) > -1) {
476 ioctl(fd, TIOCNOTTY, 0);
485 /*----------------------------------------------------------------------------
486 * check_file_access: random helper function to make sure that a file is
487 * accessible in a certain way, and complain if not.
488 *--------------------------------------------------------------------------*/
489 static char check_file_access(const char *path, char which, int mode) {
490 if (!access(path, mode))
494 "Check on %cPATH (%s) failed: %s\n"
495 "Please create file and/or rerun `make config' and "
496 "recompile to correct this.\n",
497 which, path, strerror(errno));
503 /*----------------------------------------------------------------------------
505 *--------------------------------------------------------------------------*/
506 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
507 static void set_core_limit(void) {
508 struct rlimit corelim;
510 if (getrlimit(RLIMIT_CORE, &corelim)) {
511 fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
512 corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
515 corelim.rlim_cur = corelim.rlim_max;
516 if (setrlimit(RLIMIT_CORE, &corelim))
517 fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
523 /*----------------------------------------------------------------------------
524 * set_userid_if_needed()
525 *--------------------------------------------------------------------------*/
526 static int set_userid_if_needed(void) {
527 if (getuid() == 0 || geteuid() == 0 ||
528 getgid() == 0 || getegid() == 0) {
529 fprintf(stderr, "ERROR: This server will not run as superuser.\n");
537 /*----------------------------------------------------------------------------
540 * TODO: This should set the basic environment up and start the main loop.
541 * we're doing waaaaaaaaay too much server initialization here. I hate
542 * long and ugly control paths... -smd
543 *--------------------------------------------------------------------------*/
544 int main(int argc, char **argv) {
545 CurrentTime = time(NULL);
547 thisServer.argc = argc;
548 thisServer.argv = argv;
549 thisServer.uid = getuid();
550 thisServer.euid = geteuid();
552 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
556 umask(077); /* better safe than sorry --SRB */
557 memset(&me, 0, sizeof(me));
558 memset(&me_con, 0, sizeof(me_con));
559 cli_connect(&me) = &me_con;
562 parse_command_line(argc, argv);
565 fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
569 if (!set_userid_if_needed())
572 /* Check paths for accessibility */
573 if (!check_file_access(SPATH, 'S', X_OK) ||
574 !check_file_access(configfile, 'C', R_OK))
577 debug_init(thisServer.bootopt & BOOT_TTY);
578 daemon_init(thisServer.bootopt & BOOT_TTY);
579 event_init(MAXCONNECTIONS);
582 feature_init(); /* initialize features... */
585 Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
588 set_nomem_handler(outofmemory);
590 if (!init_string()) {
591 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
608 log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
613 init_server_identity();
618 timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
619 timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
621 CurrentTime = time(NULL);
624 cli_magic(&me) = CLIENT_MAGIC;
628 cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
629 cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
630 cli_serv(&me)->up = &me;
631 cli_serv(&me)->down = NULL;
632 cli_handler(&me) = SERVER_HANDLER;
634 SetYXXCapacity(&me, MAXCLIENTS);
636 cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
643 Debug((DEBUG_NOTICE, "Server ready..."));
644 log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");