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;
239 else if (feature_bool(FEAT_VIRTUAL_HOST))
240 local = &VirtualHost;
243 cli_fd(cptr) = os_socket(local, SOCK_STREAM, cli_name(cptr));
244 if (cli_fd(cptr) < 0)
248 * save connection info in client
250 memcpy(&cli_ip(cptr), &aconf->address.addr, sizeof(cli_ip(cptr)));
251 cli_port(cptr) = aconf->address.port;
252 ircd_ntoa_r(cli_sock_ip(cptr), &cli_ip(cptr));
254 * we want a big buffer for server connections
256 if (!os_set_sockbufs(cli_fd(cptr), feature_int(FEAT_SOCKSENDBUF), feature_int(FEAT_SOCKRECVBUF))) {
257 cli_error(cptr) = errno;
258 report_error(SETBUFS_ERROR_MSG, cli_name(cptr), errno);
263 if ((result = os_connect_nonb(cli_fd(cptr), &aconf->address)) == IO_FAILURE) {
264 cli_error(cptr) = errno;
265 report_error(CONNECT_ERROR_MSG, cli_name(cptr), errno);
270 if (!socket_add(&(cli_socket(cptr)), client_sock_callback,
271 (void*) cli_connect(cptr),
272 (result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
273 SOCK_EVENT_READABLE, cli_fd(cptr))) {
274 cli_error(cptr) = ENFILE;
275 report_error(REGISTER_ERROR_MSG, cli_name(cptr), ENFILE);
280 cli_freeflag(cptr) |= FREEFLAG_SOCKET;
286 * Attempt to send a sequence of bytes to the connection.
289 * < 0 Some fatal error occurred, (but not EWOULDBLOCK).
290 * This return is a request to close the socket and
293 * >= 0 No real error occurred, returns the number of
294 * bytes actually transferred. EWOULDBLOCK and other
295 * possibly similar conditions should be mapped to
296 * zero return. Upper level routine will have to
297 * decide what to do with those unwritten bytes...
299 * *NOTE* alarm calls have been preserved, so this should
300 * work equally well whether blocking or non-blocking
303 * We don't use blocking anymore, that is impossible with the
304 * net.loads today anyway. Commented out the alarms to save cpu.
307 unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf)
309 unsigned int bytes_written = 0;
310 unsigned int bytes_count = 0;
313 switch (os_sendv_nonb(cli_fd(cptr), buf, &bytes_count, &bytes_written)) {
315 ClrFlag(cptr, FLAG_BLOCKED);
317 cli_sendB(cptr) += bytes_written;
318 cli_sendB(&me) += bytes_written;
319 if (cli_sendB(cptr) > 1023) {
320 cli_sendK(cptr) += (cli_sendB(cptr) >> 10);
321 cli_sendB(cptr) &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
323 if (cli_sendB(&me) > 1023) {
324 cli_sendK(&me) += (cli_sendB(&me) >> 10);
325 cli_sendB(&me) &= 0x03ff;
328 * XXX - hrmm.. set blocked here? the socket didn't
331 if (bytes_written < bytes_count)
332 SetFlag(cptr, FLAG_BLOCKED);
335 SetFlag(cptr, FLAG_BLOCKED);
338 cli_error(cptr) = errno;
339 SetFlag(cptr, FLAG_DEADSOCKET);
342 return bytes_written;
346 void release_dns_reply(struct Client* cptr)
349 assert(MyConnect(cptr));
351 if (cli_dns_reply(cptr)) {
352 MyFree(cli_dns_reply(cptr)->h_name);
353 MyFree(cli_dns_reply(cptr));
354 cli_dns_reply(cptr) = 0;
359 * completed_connection
361 * Complete non-blocking connect()-sequence. Check access and
362 * terminate connection, if trouble detected.
364 * Return TRUE, if successfully completed
365 * FALSE, if failed and ClientExit
367 static int completed_connection(struct Client* cptr)
369 struct ConfItem *aconf;
371 struct Client *acptr;
377 * get the socket status from the fd first to check if
378 * connection actually succeeded
380 if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) {
381 const char* msg = strerror(cli_error(cptr));
383 msg = "Unknown error";
384 sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s",
385 cli_name(cptr), msg);
388 if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) {
389 sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr));
392 if (s_state(&(cli_socket(cptr))) == SS_CONNECTING)
393 socket_state(&(cli_socket(cptr)), SS_CONNECTED);
395 if (!EmptyString(aconf->passwd))
396 sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
399 * Create a unique timestamp
402 for (i = HighestFd; i > -1; --i) {
403 if ((acptr = LocalClientArray[i]) &&
404 (IsServer(acptr) || IsHandshake(acptr))) {
405 if (cli_serv(acptr)->timestamp >= newts)
406 newts = cli_serv(acptr)->timestamp + 1;
409 assert(0 != cli_serv(cptr));
411 cli_serv(cptr)->timestamp = newts;
414 * Make us timeout after twice the timeout for DNS look ups
416 cli_lasttime(cptr) = CurrentTime;
417 SetFlag(cptr, FLAG_PINGSENT);
419 sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s :%s",
420 cli_name(&me), cli_serv(&me)->timestamp, newts,
421 MAJOR_PROTOCOL, NumServCap(&me),
422 feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me));
424 return (IsDead(cptr)) ? 0 : 1;
430 * Close the physical connection. This function must make
431 * MyConnect(cptr) == FALSE, and set cptr->from == NULL.
433 void close_connection(struct Client *cptr)
435 struct ConfItem* aconf;
437 if (IsServer(cptr)) {
438 ServerStats->is_sv++;
439 ServerStats->is_sbs += cli_sendB(cptr);
440 ServerStats->is_sbr += cli_receiveB(cptr);
441 ServerStats->is_sks += cli_sendK(cptr);
442 ServerStats->is_skr += cli_receiveK(cptr);
443 ServerStats->is_sti += CurrentTime - cli_firsttime(cptr);
444 if (ServerStats->is_sbs > 1023) {
445 ServerStats->is_sks += (ServerStats->is_sbs >> 10);
446 ServerStats->is_sbs &= 0x3ff;
448 if (ServerStats->is_sbr > 1023) {
449 ServerStats->is_skr += (ServerStats->is_sbr >> 10);
450 ServerStats->is_sbr &= 0x3ff;
453 * If the connection has been up for a long amount of time, schedule
454 * a 'quick' reconnect, else reset the next-connect cycle.
456 if ((aconf = find_conf_exact(cli_name(cptr), 0, cli_sockhost(cptr), CONF_SERVER))) {
458 * Reschedule a faster reconnect, if this was a automaticly
459 * connected configuration entry. (Note that if we have had
460 * a rehash in between, the status has been changed to
461 * CONF_ILLEGAL). But only do this if it was a "good" link.
463 aconf->hold = CurrentTime;
464 aconf->hold += ((aconf->hold - cli_since(cptr) >
465 feature_int(FEAT_HANGONGOODLINK)) ?
466 feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf));
467 /* if (nextconnect > aconf->hold) */
468 /* nextconnect = aconf->hold; */
471 else if (IsUser(cptr)) {
472 ServerStats->is_cl++;
473 ServerStats->is_cbs += cli_sendB(cptr);
474 ServerStats->is_cbr += cli_receiveB(cptr);
475 ServerStats->is_cks += cli_sendK(cptr);
476 ServerStats->is_ckr += cli_receiveK(cptr);
477 ServerStats->is_cti += CurrentTime - cli_firsttime(cptr);
478 if (ServerStats->is_cbs > 1023) {
479 ServerStats->is_cks += (ServerStats->is_cbs >> 10);
480 ServerStats->is_cbs &= 0x3ff;
482 if (ServerStats->is_cbr > 1023) {
483 ServerStats->is_ckr += (ServerStats->is_cbr >> 10);
484 ServerStats->is_cbr &= 0x3ff;
488 ServerStats->is_ni++;
490 if (-1 < cli_fd(cptr)) {
491 flush_connections(cptr);
492 LocalClientArray[cli_fd(cptr)] = 0;
494 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
497 SetFlag(cptr, FLAG_DEADSOCKET);
499 MsgQClear(&(cli_sendQ(cptr)));
500 client_drop_sendq(cli_connect(cptr));
501 DBufClear(&(cli_recvQ(cptr)));
502 memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr)));
503 set_snomask(cptr, 0, SNO_SET);
505 det_confs_butmask(cptr, 0);
507 if (cli_listener(cptr)) {
508 release_listener(cli_listener(cptr));
509 cli_listener(cptr) = 0;
512 for ( ; HighestFd > 0; --HighestFd) {
513 if (LocalClientArray[HighestFd])
518 int net_close_unregistered_connections(struct Client* source)
525 for (i = HighestFd; i > 0; --i) {
526 if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) {
527 send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP));
528 exit_client(source, cptr, &me, "Oper Closing");
535 /*----------------------------------------------------------------------------
538 * Creates a client which has just connected to us on the given fd.
539 * The sockhost field is initialized with the ip# of the host.
540 * The client is not added to the linked list of clients, it is
541 * passed off to the auth handler for dns and ident queries.
542 *--------------------------------------------------------------------------*/
543 void add_connection(struct Listener* listener, int fd) {
544 struct irc_sockaddr addr;
545 struct Client *new_client;
546 time_t next_target = 0;
548 const char* const throttle_message =
549 "ERROR :Your host is trying to (re)connect too fast -- throttled\r\n";
550 /* 12345678901234567890123456789012345679012345678901234567890123456 */
551 const char* const register_message =
552 "ERROR :Unable to complete your registration\r\n";
554 assert(0 != listener);
557 * Removed preliminary access check. Full check is performed in m_server and
558 * m_user instead. Also connection time out help to get rid of unwanted
561 if (!os_get_peername(fd, &addr) || !os_set_nonblocking(fd)) {
562 ++ServerStats->is_ref;
567 * Disable IP (*not* TCP) options. In particular, this makes it impossible
568 * to use source routing to connect to the server. If we didn't do this
569 * (and if intermediate networks didn't drop source-routed packets), an
570 * attacker could successfully IP spoof us...and even return the anti-spoof
571 * ping, because the options would cause the packet to be routed back to
572 * the spoofer's machine. When we disable the IP options, we delete the
573 * source route, and the normal routing takes over.
575 os_disable_options(fd);
578 * Add this local client to the IPcheck registry.
580 * If they're throttled, murder them, but tell them why first.
582 if (!IPcheck_local_connect(&addr.addr, &next_target) && !listener->server)
584 ++ServerStats->is_ref;
585 write(fd, throttle_message, strlen(throttle_message));
590 new_client = make_client(0, ((listener->server) ?
591 STAT_UNKNOWN_SERVER : STAT_UNKNOWN_USER));
594 * Copy ascii address to 'sockhost' just in case. Then we have something
595 * valid to put into error messages...
597 SetIPChecked(new_client);
598 ircd_ntoa_r(cli_sock_ip(new_client), &addr.addr);
599 strcpy(cli_sockhost(new_client), cli_sock_ip(new_client));
600 memcpy(&cli_ip(new_client), &addr.addr, sizeof(cli_ip(new_client)));
601 cli_port(new_client) = addr.port;
604 cli_nexttarget(new_client) = next_target;
606 cli_fd(new_client) = fd;
607 if (!socket_add(&(cli_socket(new_client)), client_sock_callback,
608 (void*) cli_connect(new_client), SS_CONNECTED, 0, fd)) {
609 ++ServerStats->is_ref;
610 write(fd, register_message, strlen(register_message));
612 cli_fd(new_client) = -1;
615 cli_freeflag(new_client) |= FREEFLAG_SOCKET;
616 cli_listener(new_client) = listener;
617 ++listener->ref_count;
619 Count_newunknown(UserStats);
620 /* if we've made it this far we can put the client on the auth query pile */
621 start_auth(new_client);
627 * Determines whether to tell the events engine we're interested in
630 void update_write(struct Client* cptr)
632 /* If there are messages that need to be sent along, or if the client
633 * is in the middle of a /list, then we need to tell the engine that
634 * we're interested in writable events--otherwise, we need to drop
637 socket_events(&(cli_socket(cptr)),
638 ((MsgQLength(&cli_sendQ(cptr)) || cli_listing(cptr)) ?
639 SOCK_ACTION_ADD : SOCK_ACTION_DEL) | SOCK_EVENT_WRITABLE);
645 * Read a 'packet' of data from a connection and process it. Read in 8k
646 * chunks to give a better performance rating (for server connections).
647 * Do some tricky stuff for client connections to make sure they don't do
648 * any flooding >:-) -avalon
650 static int read_packet(struct Client *cptr, int socket_ready)
652 unsigned int dolen = 0;
653 unsigned int length = 0;
657 DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))) {
658 switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
663 cli_lasttime(cptr) = CurrentTime;
664 if (cli_lasttime(cptr) > cli_since(cptr))
665 cli_since(cptr) = cli_lasttime(cptr);
666 ClrFlag(cptr, FLAG_PINGSENT);
667 ClrFlag(cptr, FLAG_NONL);
673 cli_error(cptr) = errno;
674 /* SetFlag(cpt, FLAG_DEADSOCKET); */
680 * For server connections, we process as many as we can without
681 * worrying about the time of day or anything :)
683 if (length > 0 && IsServer(cptr))
684 return server_dopacket(cptr, readbuf, length);
685 else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr)))
686 return connect_dopacket(cptr, readbuf, length);
690 * Before we even think of parsing what we just read, stick
691 * it on the end of the receive queue and do it when its
694 if (length > 0 && dbuf_put(&(cli_recvQ(cptr)), readbuf, length) == 0)
695 return exit_client(cptr, cptr, &me, "dbuf_put fail");
697 if (DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))
698 return exit_client(cptr, cptr, &me, "Excess Flood");
700 while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
701 (IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10))
703 dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
705 * Devious looking...whats it do ? well..if a client
706 * sends a *long* message without any CR or LF, then
707 * dbuf_getmsg fails and we pull it out using this
708 * loop which just gets the next 512 bytes and then
709 * deletes the rest of the buffer contents.
714 if (DBufLength(&(cli_recvQ(cptr))) < 510)
715 SetFlag(cptr, FLAG_NONL);
717 DBufClear(&(cli_recvQ(cptr)));
719 else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
722 * If it has become registered as a Server
723 * then skip the per-message parsing below.
725 if (IsHandshake(cptr) || IsServer(cptr))
729 dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
734 if (DBufLength(&(cli_recvQ(cptr))) < 510)
735 SetFlag(cptr, FLAG_NONL);
737 DBufClear(&(cli_recvQ(cptr)));
739 else if ((IsServer(cptr) &&
740 server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
742 connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
748 /* If there's still data to process, wait 2 seconds first */
749 if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
750 !t_onqueue(&(cli_proc(cptr))))
752 Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
753 cli_freeflag(cptr) |= FREEFLAG_TIMER;
754 timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
762 * connect_server - start or complete a connection to another server
763 * returns true (1) if successful, false (0) otherwise
765 * aconf must point to a valid C:line
766 * m_connect calls this with a valid by client and a null reply
767 * try_connections calls this with a null by client, and a null reply
768 * connect_dns_callback call this with a null by client, and a valid reply
770 * XXX - if this comes from an m_connect message and a dns query needs to
771 * be done, we loose the information about who started the connection and
772 * it's considered an auto connect.
774 int connect_server(struct ConfItem* aconf, struct Client* by)
776 struct Client* cptr = 0;
779 if (aconf->dns_pending) {
780 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
784 Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
785 ircd_ntoa(&aconf->address.addr)));
787 if ((cptr = FindClient(aconf->name))) {
788 if (IsServer(cptr) || IsMe(cptr)) {
789 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
790 aconf->name, cli_name(cli_from(cptr)));
791 if (by && IsUser(by) && !MyUser(by)) {
792 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
793 "from %s", by, aconf->name, cli_name(cli_from(cptr)));
797 else if (IsHandshake(cptr) || IsConnecting(cptr)) {
798 if (by && IsUser(by)) {
799 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
800 "progress", by, cli_name(cptr));
806 * If we dont know the IP# for this host and it is a hostname and
807 * not a ip# string, then try and find the appropriate host record.
809 if (!irc_in_addr_valid(&aconf->address.addr)
810 && !ircd_aton(&aconf->address.addr, aconf->host)) {
811 char buf[HOSTLEN + 1];
812 struct DNSQuery query;
815 query.callback = connect_dns_callback;
816 host_from_uh(buf, aconf->host, HOSTLEN);
819 gethost_byname(buf, &query);
820 aconf->dns_pending = 1;
823 cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
826 * Copy these in so we have something for error detection.
828 ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
829 ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
832 * Attach config entries to client here rather than in
833 * completed_connection. This to avoid null pointer references
835 attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
837 if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
838 sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
839 "connecting: no C-line", aconf->name);
840 if (by && IsUser(by) && !MyUser(by)) {
841 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
842 "C-line", by, aconf->name);
844 det_confs_butmask(cptr, 0);
849 * attempt to connect to the server in the conf line
851 if (!connect_inet(aconf, cptr)) {
852 if (by && IsUser(by) && !MyUser(by)) {
853 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
856 det_confs_butmask(cptr, 0);
861 * NOTE: if we're here we have a valid C:Line and the client should
862 * have started the connection and stored the remote address/port and
863 * ip address name in itself
865 * The socket has been connected or connect is in progress.
868 if (by && IsUser(by)) {
869 ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
871 assert(0 == cli_serv(cptr)->user);
872 cli_serv(cptr)->user = cli_user(by);
873 cli_user(by)->refcnt++;
876 *(cli_serv(cptr))->by = '\0';
877 /* strcpy(cptr->serv->by, "Auto"); */
879 cli_serv(cptr)->up = &me;
882 if (cli_fd(cptr) > HighestFd)
883 HighestFd = cli_fd(cptr);
886 LocalClientArray[cli_fd(cptr)] = cptr;
888 Count_newunknown(UserStats);
889 /* Actually we lie, the connect hasn't succeeded yet, but we have a valid
890 * cptr, so we register it now.
891 * Maybe these two calls should be merged.
893 add_client_to_list(cptr);
895 /* nextping = CurrentTime; */
897 return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
898 completed_connection(cptr) : 1;
902 * Setup local socket structure to use for binding to.
904 void set_virtual_host(const struct irc_in_addr *addr)
906 memset(&VirtualHost, 0, sizeof(VirtualHost));
907 memcpy(&VirtualHost.addr, addr, sizeof(VirtualHost.addr));
911 * Find the real hostname for the host running the server (or one which
912 * matches the server's name) and its primary IP#. Hostname is stored
913 * in the client structure passed as a pointer.
915 void init_server_identity(void)
917 const struct LocalConf* conf = conf_get_local();
920 ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
921 SetYXXServerName(&me, conf->numeric);
925 * Process events on a client socket
927 static void client_sock_callback(struct Event* ev)
930 struct Connection* con;
934 assert(0 != ev_socket(ev));
935 assert(0 != s_data(ev_socket(ev)));
937 con = (struct Connection*) s_data(ev_socket(ev));
939 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
941 cptr = con_client(con);
943 assert(0 == cptr || con == cli_connect(cptr));
945 switch (ev_type(ev)) {
947 con_freeflag(con) &= ~FREEFLAG_SOCKET;
949 if (!con_freeflag(con) && !cptr)
950 free_connection(con);
953 case ET_CONNECT: /* socket connection completed */
954 if (!completed_connection(cptr) || IsDead(cptr))
955 fallback = cli_info(cptr);
958 case ET_ERROR: /* an error occurred */
959 fallback = cli_info(cptr);
960 cli_error(cptr) = ev_data(ev);
961 if (s_state(&(con_socket(con))) == SS_CONNECTING) {
962 completed_connection(cptr);
966 case ET_EOF: /* end of file on socket */
967 Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
969 SetFlag(cptr, FLAG_DEADSOCKET);
970 if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
971 exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
972 cli_name(cptr), cli_serv(cptr)->last_error_msg);
975 fmt = "Read error: %s";
976 fallback = "EOF from client";
980 case ET_WRITE: /* socket is writable */
981 ClrFlag(cptr, FLAG_BLOCKED);
982 if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
983 list_next_channels(cptr, 64);
984 Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
988 case ET_READ: /* socket is readable */
990 Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
991 if (read_packet(cptr, 1) == 0) /* error while reading packet */
992 fallback = "EOF from client";
998 abort(); /* unrecognized event */
1003 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
1006 const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
1008 msg = "Unknown error";
1009 exit_client_msg(cptr, cptr, &me, fmt, msg);
1014 * Process a timer on client socket
1016 static void client_timer_callback(struct Event* ev)
1018 struct Client* cptr;
1019 struct Connection* con;
1021 assert(0 != ev_timer(ev));
1022 assert(0 != t_data(ev_timer(ev)));
1023 assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
1025 con = (struct Connection*) t_data(ev_timer(ev));
1027 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
1029 cptr = con_client(con);
1031 assert(0 == cptr || con == cli_connect(cptr));
1033 if (ev_type(ev)== ET_DESTROY) {
1034 con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
1036 if (!con_freeflag(con) && !cptr)
1037 free_connection(con); /* client is being destroyed */
1039 Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
1041 read_packet(cptr, 0); /* read_packet will re-add timer if needed */
1044 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));