2 * IRC - Internet Relay Chat, ircd/s_bsd.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"
32 #include "ircd_features.h"
33 #include "ircd_osdep.h"
34 #include "ircd_reply.h"
35 #include "ircd_snprintf.h"
36 #include "ircd_string.h"
46 #include "querycmds.h"
60 #include <arpa/inet.h>
68 #include <sys/ioctl.h>
69 #include <sys/socket.h>
71 #include <sys/utsname.h>
78 struct Client* LocalClientArray[MAXCONNECTIONS];
80 struct irc_sockaddr VirtualHost;
81 static char readbuf[SERVER_TCP_WINDOW];
84 * report_error text constants
86 const char* const ACCEPT_ERROR_MSG = "error accepting connection for %s: %s";
87 const char* const BIND_ERROR_MSG = "bind error for %s: %s";
88 const char* const CONNECT_ERROR_MSG = "connect to host %s failed: %s";
89 const char* const CONNLIMIT_ERROR_MSG = "connect limit exceeded for %s: %s";
90 const char* const LISTEN_ERROR_MSG = "listen error for %s: %s";
91 const char* const NONB_ERROR_MSG = "error setting non-blocking for %s: %s";
92 const char* const PEERNAME_ERROR_MSG = "getpeername failed for %s: %s";
93 const char* const POLL_ERROR_MSG = "poll error for %s: %s";
94 const char* const REGISTER_ERROR_MSG = "registering %s: %s";
95 const char* const REUSEADDR_ERROR_MSG = "error setting SO_REUSEADDR for %s: %s";
96 const char* const SELECT_ERROR_MSG = "select error for %s: %s";
97 const char* const SETBUFS_ERROR_MSG = "error setting buffer size for %s: %s";
98 const char* const SOCKET_ERROR_MSG = "error creating socket for %s: %s";
99 const char* const TOS_ERROR_MSG = "error setting TOS for %s: %s";
102 static void client_sock_callback(struct Event* ev);
103 static void client_timer_callback(struct Event* ev);
105 #if !defined(USE_POLL)
106 #if FD_SETSIZE < (MAXCONNECTIONS + 4)
110 * All operating systems work when MAXCONNECTIONS <= 252.
111 * Most operating systems work when MAXCONNECTIONS <= 1020 and FD_SETSIZE is
112 * updated correctly in the system headers (on BSD systems our sys.h has
113 * defined FD_SETSIZE to MAXCONNECTIONS+4 before including the system's headers
114 * but sys/types.h might have abruptly redefined it so the check is still
115 * done), you might already need to recompile your kernel.
116 * For larger FD_SETSIZE your milage may vary (kernel patches may be needed).
117 * The check is _NOT_ done if we will not use FD_SETS at all (USE_POLL)
119 #error "FD_SETSIZE is too small or MAXCONNECTIONS too large."
125 * Cannot use perror() within daemon. stderr is closed in
126 * ircd and cannot be used. And, worse yet, it might have
127 * been reassigned to a normal connection...
133 * This a replacement for perror(). Record error to log and
134 * also send a copy to all *LOCAL* opers online.
136 * text is a *format* string for outputting error. It must
137 * contain only two '%s', the first will be replaced
138 * by the sockhost from the cptr, and the latter will
139 * be taken from sys_errlist[errno].
141 * cptr if not NULL, is the *LOCAL* client associated with
144 void report_error(const char* text, const char* who, int err)
146 static time_t last_notice = 0;
147 int errtmp = errno; /* debug may change 'errno' */
148 const char* errmsg = (err) ? strerror(err) : "";
151 errmsg = "Unknown error";
153 if (EmptyString(who))
156 if (last_notice + 20 < CurrentTime) {
158 * pace error messages so opers don't get flooded by transients
160 sendto_opmask_butone(0, SNO_OLDSNO, text, who, errmsg);
161 last_notice = CurrentTime;
163 log_write(LS_SOCKET, L_ERROR, 0, text, who, errmsg);
169 * connect_dns_callback - called when resolver query finishes
170 * if the query resulted in a successful search, reply will contain
171 * a non-null pointer, otherwise reply will be null.
172 * if successful start the connection, otherwise notify opers
174 static void connect_dns_callback(void* vptr, struct DNSReply* hp)
176 struct ConfItem* aconf = (struct ConfItem*) vptr;
178 aconf->dns_pending = 0;
180 memcpy(&aconf->address, &hp->addr, sizeof(aconf->address));
182 connect_server(aconf, 0);
185 sendto_opmask_butone(0, SNO_OLDSNO, "Connect to %s failed: host lookup",
190 * close_connections - closes all connections
191 * close stderr if specified
193 void close_connections(int close_stderr)
200 for (i = 3; i < MAXCONNECTIONS; ++i)
205 * init_connection_limits - initialize process fd limit to
208 int init_connection_limits(void)
210 int limit = os_set_fdlimit(MAXCONNECTIONS);
214 fprintf(stderr, "error setting max fd's to %d\n", limit);
216 else if (limit > 0) {
217 fprintf(stderr, "ircd fd table too big\nHard Limit: %d IRC max: %d\n",
218 limit, MAXCONNECTIONS);
219 fprintf(stderr, "set MAXCONNECTIONS to a smaller value");
225 * connect_inet - set up address and port and make a connection
227 static int connect_inet(struct ConfItem* aconf, struct Client* cptr)
229 const struct irc_sockaddr *local;
234 * Might as well get sockhost from here, the connection is attempted
235 * with it so if it fails its useless.
237 if (irc_in_addr_valid(&aconf->origin.addr))
238 local = &aconf->origin;
240 local = &VirtualHost;
241 cli_fd(cptr) = os_socket(local, SOCK_STREAM, cli_name(cptr));
242 if (cli_fd(cptr) < 0)
246 * save connection info in client
248 memcpy(&cli_ip(cptr), &aconf->address.addr, sizeof(cli_ip(cptr)));
249 cli_port(cptr) = aconf->address.port;
250 ircd_ntoa_r(cli_sock_ip(cptr), &cli_ip(cptr));
252 * we want a big buffer for server connections
254 if (!os_set_sockbufs(cli_fd(cptr), feature_int(FEAT_SOCKSENDBUF), feature_int(FEAT_SOCKRECVBUF))) {
255 cli_error(cptr) = errno;
256 report_error(SETBUFS_ERROR_MSG, cli_name(cptr), errno);
261 if ((result = os_connect_nonb(cli_fd(cptr), &aconf->address)) == IO_FAILURE) {
262 cli_error(cptr) = errno;
263 report_error(CONNECT_ERROR_MSG, cli_name(cptr), errno);
268 if (!socket_add(&(cli_socket(cptr)), client_sock_callback,
269 (void*) cli_connect(cptr),
270 (result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
271 SOCK_EVENT_READABLE, cli_fd(cptr))) {
272 cli_error(cptr) = ENFILE;
273 report_error(REGISTER_ERROR_MSG, cli_name(cptr), ENFILE);
278 cli_freeflag(cptr) |= FREEFLAG_SOCKET;
284 * Attempt to send a sequence of bytes to the connection.
287 * < 0 Some fatal error occurred, (but not EWOULDBLOCK).
288 * This return is a request to close the socket and
291 * >= 0 No real error occurred, returns the number of
292 * bytes actually transferred. EWOULDBLOCK and other
293 * possibly similar conditions should be mapped to
294 * zero return. Upper level routine will have to
295 * decide what to do with those unwritten bytes...
297 * *NOTE* alarm calls have been preserved, so this should
298 * work equally well whether blocking or non-blocking
301 * We don't use blocking anymore, that is impossible with the
302 * net.loads today anyway. Commented out the alarms to save cpu.
305 unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf)
307 unsigned int bytes_written = 0;
308 unsigned int bytes_count = 0;
311 switch (os_sendv_nonb(cli_fd(cptr), buf, &bytes_count, &bytes_written)) {
313 ClrFlag(cptr, FLAG_BLOCKED);
315 cli_sendB(cptr) += bytes_written;
316 cli_sendB(&me) += bytes_written;
317 if (cli_sendB(cptr) > 1023) {
318 cli_sendK(cptr) += (cli_sendB(cptr) >> 10);
319 cli_sendB(cptr) &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
321 if (cli_sendB(&me) > 1023) {
322 cli_sendK(&me) += (cli_sendB(&me) >> 10);
323 cli_sendB(&me) &= 0x03ff;
326 * XXX - hrmm.. set blocked here? the socket didn't
329 if (bytes_written < bytes_count)
330 SetFlag(cptr, FLAG_BLOCKED);
333 SetFlag(cptr, FLAG_BLOCKED);
336 cli_error(cptr) = errno;
337 SetFlag(cptr, FLAG_DEADSOCKET);
340 return bytes_written;
344 void release_dns_reply(struct Client* cptr)
347 assert(MyConnect(cptr));
349 if (cli_dns_reply(cptr)) {
350 MyFree(cli_dns_reply(cptr)->h_name);
351 MyFree(cli_dns_reply(cptr));
352 cli_dns_reply(cptr) = 0;
357 * completed_connection
359 * Complete non-blocking connect()-sequence. Check access and
360 * terminate connection, if trouble detected.
362 * Return TRUE, if successfully completed
363 * FALSE, if failed and ClientExit
365 static int completed_connection(struct Client* cptr)
367 struct ConfItem *aconf;
369 struct Client *acptr;
375 * get the socket status from the fd first to check if
376 * connection actually succeeded
378 if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) {
379 const char* msg = strerror(cli_error(cptr));
381 msg = "Unknown error";
382 sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s",
383 cli_name(cptr), msg);
386 if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) {
387 sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr));
390 if (s_state(&(cli_socket(cptr))) == SS_CONNECTING)
391 socket_state(&(cli_socket(cptr)), SS_CONNECTED);
393 if (!EmptyString(aconf->passwd))
394 sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
397 * Create a unique timestamp
400 for (i = HighestFd; i > -1; --i) {
401 if ((acptr = LocalClientArray[i]) &&
402 (IsServer(acptr) || IsHandshake(acptr))) {
403 if (cli_serv(acptr)->timestamp >= newts)
404 newts = cli_serv(acptr)->timestamp + 1;
407 assert(0 != cli_serv(cptr));
409 cli_serv(cptr)->timestamp = newts;
412 * Make us timeout after twice the timeout for DNS look ups
414 cli_lasttime(cptr) = CurrentTime;
415 SetFlag(cptr, FLAG_PINGSENT);
417 sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s :%s",
418 cli_name(&me), cli_serv(&me)->timestamp, newts,
419 MAJOR_PROTOCOL, NumServCap(&me),
420 feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me));
422 return (IsDead(cptr)) ? 0 : 1;
428 * Close the physical connection. This function must make
429 * MyConnect(cptr) == FALSE, and set cptr->from == NULL.
431 void close_connection(struct Client *cptr)
433 struct ConfItem* aconf;
435 if (IsServer(cptr)) {
436 ServerStats->is_sv++;
437 ServerStats->is_sbs += cli_sendB(cptr);
438 ServerStats->is_sbr += cli_receiveB(cptr);
439 ServerStats->is_sks += cli_sendK(cptr);
440 ServerStats->is_skr += cli_receiveK(cptr);
441 ServerStats->is_sti += CurrentTime - cli_firsttime(cptr);
442 if (ServerStats->is_sbs > 1023) {
443 ServerStats->is_sks += (ServerStats->is_sbs >> 10);
444 ServerStats->is_sbs &= 0x3ff;
446 if (ServerStats->is_sbr > 1023) {
447 ServerStats->is_skr += (ServerStats->is_sbr >> 10);
448 ServerStats->is_sbr &= 0x3ff;
451 * If the connection has been up for a long amount of time, schedule
452 * a 'quick' reconnect, else reset the next-connect cycle.
454 if ((aconf = find_conf_exact(cli_name(cptr), 0, cli_sockhost(cptr), CONF_SERVER))) {
456 * Reschedule a faster reconnect, if this was a automaticly
457 * connected configuration entry. (Note that if we have had
458 * a rehash in between, the status has been changed to
459 * CONF_ILLEGAL). But only do this if it was a "good" link.
461 aconf->hold = CurrentTime;
462 aconf->hold += ((aconf->hold - cli_since(cptr) >
463 feature_int(FEAT_HANGONGOODLINK)) ?
464 feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf));
465 /* if (nextconnect > aconf->hold) */
466 /* nextconnect = aconf->hold; */
469 else if (IsUser(cptr)) {
470 ServerStats->is_cl++;
471 ServerStats->is_cbs += cli_sendB(cptr);
472 ServerStats->is_cbr += cli_receiveB(cptr);
473 ServerStats->is_cks += cli_sendK(cptr);
474 ServerStats->is_ckr += cli_receiveK(cptr);
475 ServerStats->is_cti += CurrentTime - cli_firsttime(cptr);
476 if (ServerStats->is_cbs > 1023) {
477 ServerStats->is_cks += (ServerStats->is_cbs >> 10);
478 ServerStats->is_cbs &= 0x3ff;
480 if (ServerStats->is_cbr > 1023) {
481 ServerStats->is_ckr += (ServerStats->is_cbr >> 10);
482 ServerStats->is_cbr &= 0x3ff;
486 ServerStats->is_ni++;
488 if (-1 < cli_fd(cptr)) {
489 flush_connections(cptr);
490 LocalClientArray[cli_fd(cptr)] = 0;
492 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
495 SetFlag(cptr, FLAG_DEADSOCKET);
497 MsgQClear(&(cli_sendQ(cptr)));
498 client_drop_sendq(cli_connect(cptr));
499 DBufClear(&(cli_recvQ(cptr)));
500 memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr)));
501 set_snomask(cptr, 0, SNO_SET);
503 det_confs_butmask(cptr, 0);
505 if (cli_listener(cptr)) {
506 release_listener(cli_listener(cptr));
507 cli_listener(cptr) = 0;
510 for ( ; HighestFd > 0; --HighestFd) {
511 if (LocalClientArray[HighestFd])
516 int net_close_unregistered_connections(struct Client* source)
523 for (i = HighestFd; i > 0; --i) {
524 if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) {
525 send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP));
526 exit_client(source, cptr, &me, "Oper Closing");
533 /*----------------------------------------------------------------------------
536 * Creates a client which has just connected to us on the given fd.
537 * The sockhost field is initialized with the ip# of the host.
538 * The client is not added to the linked list of clients, it is
539 * passed off to the auth handler for dns and ident queries.
540 *--------------------------------------------------------------------------*/
541 void add_connection(struct Listener* listener, int fd) {
542 struct irc_sockaddr addr;
543 struct Client *new_client;
544 time_t next_target = 0;
546 const char* const throttle_message =
547 "ERROR :Your host is trying to (re)connect too fast -- throttled\r\n";
548 /* 12345678901234567890123456789012345679012345678901234567890123456 */
549 const char* const register_message =
550 "ERROR :Unable to complete your registration\r\n";
552 assert(0 != listener);
555 * Removed preliminary access check. Full check is performed in m_server and
556 * m_user instead. Also connection time out help to get rid of unwanted
559 if (!os_get_peername(fd, &addr) || !os_set_nonblocking(fd)) {
560 ++ServerStats->is_ref;
565 * Disable IP (*not* TCP) options. In particular, this makes it impossible
566 * to use source routing to connect to the server. If we didn't do this
567 * (and if intermediate networks didn't drop source-routed packets), an
568 * attacker could successfully IP spoof us...and even return the anti-spoof
569 * ping, because the options would cause the packet to be routed back to
570 * the spoofer's machine. When we disable the IP options, we delete the
571 * source route, and the normal routing takes over.
573 os_disable_options(fd);
576 * Add this local client to the IPcheck registry.
578 * If they're throttled, murder them, but tell them why first.
580 if (!IPcheck_local_connect(&addr.addr, &next_target) && !listener->server)
582 ++ServerStats->is_ref;
583 write(fd, throttle_message, strlen(throttle_message));
588 new_client = make_client(0, ((listener->server) ?
589 STAT_UNKNOWN_SERVER : STAT_UNKNOWN_USER));
592 * Copy ascii address to 'sockhost' just in case. Then we have something
593 * valid to put into error messages...
595 SetIPChecked(new_client);
596 ircd_ntoa_r(cli_sock_ip(new_client), &addr.addr);
597 strcpy(cli_sockhost(new_client), cli_sock_ip(new_client));
598 memcpy(&cli_ip(new_client), &addr.addr, sizeof(cli_ip(new_client)));
599 cli_port(new_client) = addr.port;
602 cli_nexttarget(new_client) = next_target;
604 cli_fd(new_client) = fd;
605 if (!socket_add(&(cli_socket(new_client)), client_sock_callback,
606 (void*) cli_connect(new_client), SS_CONNECTED, 0, fd)) {
607 ++ServerStats->is_ref;
608 write(fd, register_message, strlen(register_message));
610 cli_fd(new_client) = -1;
613 cli_freeflag(new_client) |= FREEFLAG_SOCKET;
614 cli_listener(new_client) = listener;
615 ++listener->ref_count;
617 Count_newunknown(UserStats);
618 /* if we've made it this far we can put the client on the auth query pile */
619 start_auth(new_client);
625 * Determines whether to tell the events engine we're interested in
628 void update_write(struct Client* cptr)
630 /* If there are messages that need to be sent along, or if the client
631 * is in the middle of a /list, then we need to tell the engine that
632 * we're interested in writable events--otherwise, we need to drop
635 socket_events(&(cli_socket(cptr)),
636 ((MsgQLength(&cli_sendQ(cptr)) || cli_listing(cptr)) ?
637 SOCK_ACTION_ADD : SOCK_ACTION_DEL) | SOCK_EVENT_WRITABLE);
643 * Read a 'packet' of data from a connection and process it. Read in 8k
644 * chunks to give a better performance rating (for server connections).
645 * Do some tricky stuff for client connections to make sure they don't do
646 * any flooding >:-) -avalon
648 static int read_packet(struct Client *cptr, int socket_ready)
650 unsigned int dolen = 0;
651 unsigned int length = 0;
655 DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))) {
656 switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
661 cli_lasttime(cptr) = CurrentTime;
662 if (cli_lasttime(cptr) > cli_since(cptr))
663 cli_since(cptr) = cli_lasttime(cptr);
664 ClrFlag(cptr, FLAG_PINGSENT);
665 ClrFlag(cptr, FLAG_NONL);
671 cli_error(cptr) = errno;
672 /* SetFlag(cpt, FLAG_DEADSOCKET); */
678 * For server connections, we process as many as we can without
679 * worrying about the time of day or anything :)
681 if (length > 0 && IsServer(cptr))
682 return server_dopacket(cptr, readbuf, length);
683 else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr)))
684 return connect_dopacket(cptr, readbuf, length);
688 * Before we even think of parsing what we just read, stick
689 * it on the end of the receive queue and do it when its
692 if (length > 0 && dbuf_put(&(cli_recvQ(cptr)), readbuf, length) == 0)
693 return exit_client(cptr, cptr, &me, "dbuf_put fail");
695 if (DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))
696 return exit_client(cptr, cptr, &me, "Excess Flood");
698 while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
699 (IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10))
701 dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
703 * Devious looking...whats it do ? well..if a client
704 * sends a *long* message without any CR or LF, then
705 * dbuf_getmsg fails and we pull it out using this
706 * loop which just gets the next 512 bytes and then
707 * deletes the rest of the buffer contents.
712 if (DBufLength(&(cli_recvQ(cptr))) < 510)
713 SetFlag(cptr, FLAG_NONL);
715 DBufClear(&(cli_recvQ(cptr)));
717 else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
720 * If it has become registered as a Server
721 * then skip the per-message parsing below.
723 if (IsHandshake(cptr) || IsServer(cptr))
727 dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
732 if (DBufLength(&(cli_recvQ(cptr))) < 510)
733 SetFlag(cptr, FLAG_NONL);
735 DBufClear(&(cli_recvQ(cptr)));
737 else if ((IsServer(cptr) &&
738 server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
740 connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
746 /* If there's still data to process, wait 2 seconds first */
747 if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
748 !t_onqueue(&(cli_proc(cptr))))
750 Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
751 cli_freeflag(cptr) |= FREEFLAG_TIMER;
752 timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
760 * connect_server - start or complete a connection to another server
761 * returns true (1) if successful, false (0) otherwise
763 * aconf must point to a valid C:line
764 * m_connect calls this with a valid by client and a null reply
765 * try_connections calls this with a null by client, and a null reply
766 * connect_dns_callback call this with a null by client, and a valid reply
768 * XXX - if this comes from an m_connect message and a dns query needs to
769 * be done, we loose the information about who started the connection and
770 * it's considered an auto connect.
772 int connect_server(struct ConfItem* aconf, struct Client* by)
774 struct Client* cptr = 0;
777 if (aconf->dns_pending) {
778 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
782 Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
783 ircd_ntoa(&aconf->address.addr)));
785 if ((cptr = FindClient(aconf->name))) {
786 if (IsServer(cptr) || IsMe(cptr)) {
787 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
788 aconf->name, cli_name(cli_from(cptr)));
789 if (by && IsUser(by) && !MyUser(by)) {
790 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
791 "from %s", by, aconf->name, cli_name(cli_from(cptr)));
795 else if (IsHandshake(cptr) || IsConnecting(cptr)) {
796 if (by && IsUser(by)) {
797 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
798 "progress", by, cli_name(cptr));
804 * If we dont know the IP# for this host and it is a hostname and
805 * not a ip# string, then try and find the appropriate host record.
807 if (!irc_in_addr_valid(&aconf->address.addr)
808 && !ircd_aton(&aconf->address.addr, aconf->host)) {
809 char buf[HOSTLEN + 1];
810 struct DNSQuery query;
813 query.callback = connect_dns_callback;
814 host_from_uh(buf, aconf->host, HOSTLEN);
817 gethost_byname(buf, &query);
818 aconf->dns_pending = 1;
821 cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
824 * Copy these in so we have something for error detection.
826 ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
827 ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
830 * Attach config entries to client here rather than in
831 * completed_connection. This to avoid null pointer references
833 attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
835 if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
836 sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
837 "connecting: no C-line", aconf->name);
838 if (by && IsUser(by) && !MyUser(by)) {
839 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
840 "C-line", by, aconf->name);
842 det_confs_butmask(cptr, 0);
847 * attempt to connect to the server in the conf line
849 if (!connect_inet(aconf, cptr)) {
850 if (by && IsUser(by) && !MyUser(by)) {
851 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
854 det_confs_butmask(cptr, 0);
859 * NOTE: if we're here we have a valid C:Line and the client should
860 * have started the connection and stored the remote address/port and
861 * ip address name in itself
863 * The socket has been connected or connect is in progress.
866 if (by && IsUser(by)) {
867 ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
869 assert(0 == cli_serv(cptr)->user);
870 cli_serv(cptr)->user = cli_user(by);
871 cli_user(by)->refcnt++;
874 *(cli_serv(cptr))->by = '\0';
875 /* strcpy(cptr->serv->by, "Auto"); */
877 cli_serv(cptr)->up = &me;
880 if (cli_fd(cptr) > HighestFd)
881 HighestFd = cli_fd(cptr);
884 LocalClientArray[cli_fd(cptr)] = cptr;
886 Count_newunknown(UserStats);
887 /* Actually we lie, the connect hasn't succeeded yet, but we have a valid
888 * cptr, so we register it now.
889 * Maybe these two calls should be merged.
891 add_client_to_list(cptr);
893 /* nextping = CurrentTime; */
895 return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
896 completed_connection(cptr) : 1;
900 * Find the real hostname for the host running the server (or one which
901 * matches the server's name) and its primary IP#. Hostname is stored
902 * in the client structure passed as a pointer.
904 void init_server_identity(void)
906 const struct LocalConf* conf = conf_get_local();
909 ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
910 SetYXXServerName(&me, conf->numeric);
914 * Process events on a client socket
916 static void client_sock_callback(struct Event* ev)
919 struct Connection* con;
923 assert(0 != ev_socket(ev));
924 assert(0 != s_data(ev_socket(ev)));
926 con = (struct Connection*) s_data(ev_socket(ev));
928 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
930 cptr = con_client(con);
932 assert(0 == cptr || con == cli_connect(cptr));
934 switch (ev_type(ev)) {
936 con_freeflag(con) &= ~FREEFLAG_SOCKET;
938 if (!con_freeflag(con) && !cptr)
939 free_connection(con);
942 case ET_CONNECT: /* socket connection completed */
943 if (!completed_connection(cptr) || IsDead(cptr))
944 fallback = cli_info(cptr);
947 case ET_ERROR: /* an error occurred */
948 fallback = cli_info(cptr);
949 cli_error(cptr) = ev_data(ev);
950 if (s_state(&(con_socket(con))) == SS_CONNECTING) {
951 completed_connection(cptr);
955 case ET_EOF: /* end of file on socket */
956 Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
958 SetFlag(cptr, FLAG_DEADSOCKET);
959 if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
960 exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
961 cli_name(cptr), cli_serv(cptr)->last_error_msg);
964 fmt = "Read error: %s";
965 fallback = "EOF from client";
969 case ET_WRITE: /* socket is writable */
970 ClrFlag(cptr, FLAG_BLOCKED);
971 if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
972 list_next_channels(cptr, 64);
973 Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
977 case ET_READ: /* socket is readable */
979 Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
980 if (read_packet(cptr, 1) == 0) /* error while reading packet */
981 fallback = "EOF from client";
987 abort(); /* unrecognized event */
992 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
995 const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
997 msg = "Unknown error";
998 exit_client_msg(cptr, cptr, &me, fmt, msg);
1003 * Process a timer on client socket
1005 static void client_timer_callback(struct Event* ev)
1007 struct Client* cptr;
1008 struct Connection* con;
1010 assert(0 != ev_timer(ev));
1011 assert(0 != t_data(ev_timer(ev)));
1012 assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
1014 con = (struct Connection*) t_data(ev_timer(ev));
1016 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
1018 cptr = con_client(con);
1020 assert(0 == cptr || con == cli_connect(cptr));
1022 if (ev_type(ev)== ET_DESTROY) {
1023 con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
1025 if (!con_freeflag(con) && !cptr)
1026 free_connection(con); /* client is being destroyed */
1028 Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
1030 read_packet(cptr, 0); /* read_packet will re-add timer if needed */
1033 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));