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.
31 #include "ircd_features.h"
32 #include "ircd_osdep.h"
33 #include "ircd_reply.h"
34 #include "ircd_snprintf.h"
35 #include "ircd_string.h"
45 #include "querycmds.h"
59 #include <arpa/inet.h>
60 #include <arpa/nameser.h>
69 #include <sys/ioctl.h>
70 #include <sys/socket.h>
72 #include <sys/utsname.h>
80 #define INADDR_NONE 0xffffffff
83 struct Client* LocalClientArray[MAXCONNECTIONS];
85 struct sockaddr_in VirtualHost;
86 static char readbuf[SERVER_TCP_WINDOW];
89 * report_error text constants
91 const char* const ACCEPT_ERROR_MSG = "error accepting connection for %s: %s";
92 const char* const BIND_ERROR_MSG = "bind error for %s: %s";
93 const char* const CONNECT_ERROR_MSG = "connect to host %s failed: %s";
94 const char* const CONNLIMIT_ERROR_MSG = "connect limit exceeded for %s: %s";
95 const char* const LISTEN_ERROR_MSG = "listen error for %s: %s";
96 const char* const NONB_ERROR_MSG = "error setting non-blocking for %s: %s";
97 const char* const PEERNAME_ERROR_MSG = "getpeername failed for %s: %s";
98 const char* const POLL_ERROR_MSG = "poll error for %s: %s";
99 const char* const REGISTER_ERROR_MSG = "registering %s: %s";
100 const char* const REUSEADDR_ERROR_MSG = "error setting SO_REUSEADDR for %s: %s";
101 const char* const SELECT_ERROR_MSG = "select error for %s: %s";
102 const char* const SETBUFS_ERROR_MSG = "error setting buffer size for %s: %s";
103 const char* const SOCKET_ERROR_MSG = "error creating socket for %s: %s";
104 const char* const TOS_ERROR_MSG = "error setting TOS for %s: %s";
107 static void client_sock_callback(struct Event* ev);
108 static void client_timer_callback(struct Event* ev);
110 #if !defined(USE_POLL)
111 #if FD_SETSIZE < (MAXCONNECTIONS + 4)
115 * All operating systems work when MAXCONNECTIONS <= 252.
116 * Most operating systems work when MAXCONNECTIONS <= 1020 and FD_SETSIZE is
117 * updated correctly in the system headers (on BSD systems our sys.h has
118 * defined FD_SETSIZE to MAXCONNECTIONS+4 before including the system's headers
119 * but sys/types.h might have abruptly redefined it so the check is still
120 * done), you might already need to recompile your kernel.
121 * For larger FD_SETSIZE your milage may vary (kernel patches may be needed).
122 * The check is _NOT_ done if we will not use FD_SETS at all (USE_POLL)
124 #error "FD_SETSIZE is too small or MAXCONNECTIONS too large."
130 * Cannot use perror() within daemon. stderr is closed in
131 * ircd and cannot be used. And, worse yet, it might have
132 * been reassigned to a normal connection...
138 * This a replacement for perror(). Record error to log and
139 * also send a copy to all *LOCAL* opers online.
141 * text is a *format* string for outputting error. It must
142 * contain only two '%s', the first will be replaced
143 * by the sockhost from the cptr, and the latter will
144 * be taken from sys_errlist[errno].
146 * cptr if not NULL, is the *LOCAL* client associated with
149 void report_error(const char* text, const char* who, int err)
151 static time_t last_notice = 0;
152 int errtmp = errno; /* debug may change 'errno' */
153 const char* errmsg = (err) ? strerror(err) : "";
156 errmsg = "Unknown error";
158 if (EmptyString(who))
161 if (last_notice + 20 < CurrentTime) {
163 * pace error messages so opers don't get flooded by transients
165 sendto_opmask_butone(0, SNO_OLDSNO, text, who, errmsg);
166 last_notice = CurrentTime;
168 log_write(LS_SOCKET, L_ERROR, 0, text, who, errmsg);
174 * connect_dns_callback - called when resolver query finishes
175 * if the query resulted in a successful search, reply will contain
176 * a non-null pointer, otherwise reply will be null.
177 * if successful start the connection, otherwise notify opers
179 static void connect_dns_callback(void* vptr, struct DNSReply* reply)
181 struct ConfItem* aconf = (struct ConfItem*) vptr;
182 aconf->dns_pending = 0;
184 memcpy(&aconf->ipnum, reply->hp->h_addr, sizeof(struct in_addr));
185 connect_server(aconf, 0, reply);
188 sendto_opmask_butone(0, SNO_OLDSNO, "Connect to %s failed: host lookup",
193 * close_connections - closes all connections
194 * close stderr if specified
196 void close_connections(int close_stderr)
205 for (i = 3; i < MAXCONNECTIONS; ++i)
210 * init_connection_limits - initialize process fd limit to
213 int init_connection_limits(void)
215 int limit = os_set_fdlimit(MAXCONNECTIONS);
219 fprintf(stderr, "error setting max fd's to %d\n", limit);
221 else if (limit > 0) {
222 fprintf(stderr, "ircd fd table too big\nHard Limit: %d IRC max: %d\n",
223 limit, MAXCONNECTIONS);
224 fprintf(stderr, "set MAXCONNECTIONS to a smaller value");
230 * connect_inet - set up address and port and make a connection
232 static int connect_inet(struct ConfItem* aconf, struct Client* cptr)
234 static struct sockaddr_in sin;
239 * Might as well get sockhost from here, the connection is attempted
240 * with it so if it fails its useless.
242 cli_fd(cptr) = socket(AF_INET, SOCK_STREAM, 0);
243 if (-1 == cli_fd(cptr)) {
244 cli_error(cptr) = errno;
245 report_error(SOCKET_ERROR_MSG, cli_name(cptr), errno);
248 if (cli_fd(cptr) >= MAXCLIENTS) {
249 report_error(CONNLIMIT_ERROR_MSG, cli_name(cptr), 0);
255 * Bind to a local IP# (with unknown port - let unix decide) so
256 * we have some chance of knowing the IP# that gets used for a host
257 * with more than one IP#.
259 * No we don't bind it, not all OS's can handle connecting with
260 * an already bound socket, different ip# might occur anyway
261 * leading to a freezing select() on this side for some time.
262 * I had this on my Linux 1.1.88 --Run
266 * No, we do bind it if we have virtual host support. If we don't
267 * explicitly bind it, it will default to IN_ADDR_ANY and we lose
268 * due to the other server not allowing our base IP --smg
270 if (feature_bool(FEAT_VIRTUAL_HOST) &&
271 bind(cli_fd(cptr), (struct sockaddr*) &VirtualHost,
272 sizeof(VirtualHost))) {
273 report_error(BIND_ERROR_MSG, cli_name(cptr), errno);
279 memset(&sin, 0, sizeof(sin));
280 sin.sin_family = AF_INET;
281 sin.sin_addr.s_addr = aconf->ipnum.s_addr;
282 sin.sin_port = htons(aconf->port);
284 * save connection info in client
286 (cli_ip(cptr)).s_addr = aconf->ipnum.s_addr;
287 cli_port(cptr) = aconf->port;
288 ircd_ntoa_r(cli_sock_ip(cptr), (const char*) &(cli_ip(cptr)));
290 * we want a big buffer for server connections
292 if (!os_set_sockbufs(cli_fd(cptr), SERVER_TCP_WINDOW)) {
293 cli_error(cptr) = errno;
294 report_error(SETBUFS_ERROR_MSG, cli_name(cptr), errno);
300 * ALWAYS set sockets non-blocking
302 if (!os_set_nonblocking(cli_fd(cptr))) {
303 cli_error(cptr) = errno;
304 report_error(NONB_ERROR_MSG, cli_name(cptr), errno);
309 if ((result = os_connect_nonb(cli_fd(cptr), &sin)) == IO_FAILURE) {
310 cli_error(cptr) = errno;
311 report_error(CONNECT_ERROR_MSG, cli_name(cptr), errno);
316 if (!socket_add(&(cli_socket(cptr)), client_sock_callback,
317 (void*) cli_connect(cptr),
318 (result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
319 SOCK_EVENT_READABLE, cli_fd(cptr))) {
320 cli_error(cptr) = ENFILE;
321 report_error(REGISTER_ERROR_MSG, cli_name(cptr), ENFILE);
326 cli_freeflag(cptr) |= FREEFLAG_SOCKET;
332 * Attempt to send a sequence of bytes to the connection.
335 * < 0 Some fatal error occurred, (but not EWOULDBLOCK).
336 * This return is a request to close the socket and
339 * >= 0 No real error occurred, returns the number of
340 * bytes actually transferred. EWOULDBLOCK and other
341 * possibly similar conditions should be mapped to
342 * zero return. Upper level routine will have to
343 * decide what to do with those unwritten bytes...
345 * *NOTE* alarm calls have been preserved, so this should
346 * work equally well whether blocking or non-blocking
349 * We don't use blocking anymore, that is impossible with the
350 * net.loads today anyway. Commented out the alarms to save cpu.
353 unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf)
355 unsigned int bytes_written = 0;
356 unsigned int bytes_count = 0;
359 switch (os_sendv_nonb(cli_fd(cptr), buf, &bytes_count, &bytes_written)) {
361 cli_flags(cptr) &= ~FLAGS_BLOCKED;
363 cli_sendB(cptr) += bytes_written;
364 cli_sendB(&me) += bytes_written;
365 if (cli_sendB(cptr) > 1023) {
366 cli_sendK(cptr) += (cli_sendB(cptr) >> 10);
367 cli_sendB(cptr) &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
369 if (cli_sendB(&me) > 1023) {
370 cli_sendK(&me) += (cli_sendB(&me) >> 10);
371 cli_sendB(&me) &= 0x03ff;
374 * XXX - hrmm.. set blocked here? the socket didn't
377 if (bytes_written < bytes_count)
378 cli_flags(cptr) |= FLAGS_BLOCKED;
381 cli_flags(cptr) |= FLAGS_BLOCKED;
384 cli_error(cptr) = errno;
385 cli_flags(cptr) |= FLAGS_DEADSOCKET;
388 return bytes_written;
392 void release_dns_reply(struct Client* cptr)
395 assert(MyConnect(cptr));
397 if (cli_dns_reply(cptr)) {
398 assert(0 < cli_dns_reply(cptr)->ref_count);
399 --(cli_dns_reply(cptr))->ref_count;
400 cli_dns_reply(cptr) = 0;
405 * completed_connection
407 * Complete non-blocking connect()-sequence. Check access and
408 * terminate connection, if trouble detected.
410 * Return TRUE, if successfully completed
411 * FALSE, if failed and ClientExit
413 static int completed_connection(struct Client* cptr)
415 struct ConfItem *aconf;
417 struct Client *acptr;
423 * get the socket status from the fd first to check if
424 * connection actually succeeded
426 if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) {
427 const char* msg = strerror(cli_error(cptr));
429 msg = "Unknown error";
430 sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s",
431 cli_name(cptr), msg);
434 if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) {
435 sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr));
438 if (s_state(&(cli_socket(cptr))) == SS_CONNECTING)
439 socket_state(&(cli_socket(cptr)), SS_CONNECTED);
441 if (!EmptyString(aconf->passwd))
442 sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
445 * Create a unique timestamp
448 for (i = HighestFd; i > -1; --i) {
449 if ((acptr = LocalClientArray[i]) &&
450 (IsServer(acptr) || IsHandshake(acptr))) {
451 if (cli_serv(acptr)->timestamp >= newts)
452 newts = cli_serv(acptr)->timestamp + 1;
455 assert(0 != cli_serv(cptr));
457 cli_serv(cptr)->timestamp = newts;
460 * Make us timeout after twice the timeout for DNS look ups
462 cli_lasttime(cptr) = CurrentTime;
463 cli_flags(cptr) |= FLAGS_PINGSENT;
465 sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s :%s",
466 cli_name(&me), cli_serv(&me)->timestamp, newts,
467 MAJOR_PROTOCOL, NumServCap(&me),
468 feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me));
470 return (IsDead(cptr)) ? 0 : 1;
476 * Close the physical connection. This function must make
477 * MyConnect(cptr) == FALSE, and set cptr->from == NULL.
479 void close_connection(struct Client *cptr)
481 struct ConfItem* aconf;
483 if (IsServer(cptr)) {
484 ServerStats->is_sv++;
485 ServerStats->is_sbs += cli_sendB(cptr);
486 ServerStats->is_sbr += cli_receiveB(cptr);
487 ServerStats->is_sks += cli_sendK(cptr);
488 ServerStats->is_skr += cli_receiveK(cptr);
489 ServerStats->is_sti += CurrentTime - cli_firsttime(cptr);
490 if (ServerStats->is_sbs > 1023) {
491 ServerStats->is_sks += (ServerStats->is_sbs >> 10);
492 ServerStats->is_sbs &= 0x3ff;
494 if (ServerStats->is_sbr > 1023) {
495 ServerStats->is_skr += (ServerStats->is_sbr >> 10);
496 ServerStats->is_sbr &= 0x3ff;
499 * If the connection has been up for a long amount of time, schedule
500 * a 'quick' reconnect, else reset the next-connect cycle.
502 if ((aconf = find_conf_exact(cli_name(cptr), 0, cli_sockhost(cptr), CONF_SERVER))) {
504 * Reschedule a faster reconnect, if this was a automaticly
505 * connected configuration entry. (Note that if we have had
506 * a rehash in between, the status has been changed to
507 * CONF_ILLEGAL). But only do this if it was a "good" link.
509 aconf->hold = CurrentTime;
510 aconf->hold += ((aconf->hold - cli_since(cptr) >
511 feature_int(FEAT_HANGONGOODLINK)) ?
512 feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf));
513 /* if (nextconnect > aconf->hold) */
514 /* nextconnect = aconf->hold; */
517 else if (IsUser(cptr)) {
518 ServerStats->is_cl++;
519 ServerStats->is_cbs += cli_sendB(cptr);
520 ServerStats->is_cbr += cli_receiveB(cptr);
521 ServerStats->is_cks += cli_sendK(cptr);
522 ServerStats->is_ckr += cli_receiveK(cptr);
523 ServerStats->is_cti += CurrentTime - cli_firsttime(cptr);
524 if (ServerStats->is_cbs > 1023) {
525 ServerStats->is_cks += (ServerStats->is_cbs >> 10);
526 ServerStats->is_cbs &= 0x3ff;
528 if (ServerStats->is_cbr > 1023) {
529 ServerStats->is_ckr += (ServerStats->is_cbr >> 10);
530 ServerStats->is_cbr &= 0x3ff;
534 ServerStats->is_ni++;
536 if (-1 < cli_fd(cptr)) {
537 flush_connections(cptr);
538 LocalClientArray[cli_fd(cptr)] = 0;
540 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
543 cli_flags(cptr) |= FLAGS_DEADSOCKET;
545 MsgQClear(&(cli_sendQ(cptr)));
546 client_drop_sendq(cli_connect(cptr));
547 DBufClear(&(cli_recvQ(cptr)));
548 memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr)));
549 set_snomask(cptr, 0, SNO_SET);
551 det_confs_butmask(cptr, 0);
553 if (cli_listener(cptr)) {
554 release_listener(cli_listener(cptr));
555 cli_listener(cptr) = 0;
558 for ( ; HighestFd > 0; --HighestFd) {
559 if (LocalClientArray[HighestFd])
564 int net_close_unregistered_connections(struct Client* source)
571 for (i = HighestFd; i > 0; --i) {
572 if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) {
573 send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP));
574 exit_client(source, cptr, &me, "Oper Closing");
581 /*----------------------------------------------------------------------------
584 * Creates a client which has just connected to us on the given fd.
585 * The sockhost field is initialized with the ip# of the host.
586 * The client is not added to the linked list of clients, it is
587 * passed off to the auth handler for dns and ident queries.
588 *--------------------------------------------------------------------------*/
589 void add_connection(struct Listener* listener, int fd) {
590 struct sockaddr_in addr;
591 struct Client *new_client;
592 time_t next_target = 0;
594 const char* const throttle_message =
595 "ERROR :Your host is trying to (re)connect too fast -- throttled\r\n";
596 /* 12345678901234567890123456789012345679012345678901234567890123456 */
597 const char* const register_message =
598 "ERROR :Unable to complete your registration\r\n";
600 assert(0 != listener);
604 * Removed preliminary access check. Full check is performed in m_server and
605 * m_user instead. Also connection time out help to get rid of unwanted
608 if (!os_get_peername(fd, &addr) || !os_set_nonblocking(fd)) {
609 ++ServerStats->is_ref;
614 * Disable IP (*not* TCP) options. In particular, this makes it impossible
615 * to use source routing to connect to the server. If we didn't do this
616 * (and if intermediate networks didn't drop source-routed packets), an
617 * attacker could successfully IP spoof us...and even return the anti-spoof
618 * ping, because the options would cause the packet to be routed back to
619 * the spoofer's machine. When we disable the IP options, we delete the
620 * source route, and the normal routing takes over.
622 os_disable_options(fd);
625 * Add this local client to the IPcheck registry.
627 * If they're throttled, murder them, but tell them why first.
629 if (!IPcheck_local_connect(addr.sin_addr, &next_target) && !listener->server)
631 ++ServerStats->is_ref;
632 write(fd, throttle_message, strlen(throttle_message));
637 new_client = make_client(0, ((listener->server) ?
638 STAT_UNKNOWN_SERVER : STAT_UNKNOWN_USER));
641 * Copy ascii address to 'sockhost' just in case. Then we have something
642 * valid to put into error messages...
644 SetIPChecked(new_client);
645 ircd_ntoa_r(cli_sock_ip(new_client), (const char*) &addr.sin_addr);
646 strcpy(cli_sockhost(new_client), cli_sock_ip(new_client));
647 (cli_ip(new_client)).s_addr = addr.sin_addr.s_addr;
648 cli_port(new_client) = ntohs(addr.sin_port);
651 cli_nexttarget(new_client) = next_target;
653 cli_fd(new_client) = fd;
654 if (!socket_add(&(cli_socket(new_client)), client_sock_callback,
655 (void*) cli_connect(new_client), SS_CONNECTED, 0, fd)) {
656 ++ServerStats->is_ref;
657 write(fd, register_message, strlen(register_message));
659 cli_fd(new_client) = -1;
662 cli_freeflag(new_client) |= FREEFLAG_SOCKET;
663 cli_listener(new_client) = listener;
664 ++listener->ref_count;
666 Count_newunknown(UserStats);
667 /* if we've made it this far we can put the client on the auth query pile */
668 start_auth(new_client);
674 * Determines whether to tell the events engine we're interested in
677 void update_write(struct Client* cptr)
679 /* If there are messages that need to be sent along, or if the client
680 * is in the middle of a /list, then we need to tell the engine that
681 * we're interested in writable events--otherwise, we need to drop
684 socket_events(&(cli_socket(cptr)),
685 ((MsgQLength(&cli_sendQ(cptr)) || cli_listing(cptr)) ?
686 SOCK_ACTION_ADD : SOCK_ACTION_DEL) | SOCK_EVENT_WRITABLE);
692 * Read a 'packet' of data from a connection and process it. Read in 8k
693 * chunks to give a better performance rating (for server connections).
694 * Do some tricky stuff for client connections to make sure they don't do
695 * any flooding >:-) -avalon
697 static int read_packet(struct Client *cptr, int socket_ready)
699 unsigned int dolen = 0;
700 unsigned int length = 0;
704 DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))) {
705 switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
708 cli_lasttime(cptr) = CurrentTime;
709 if (cli_lasttime(cptr) > cli_since(cptr))
710 cli_since(cptr) = cli_lasttime(cptr);
711 cli_flags(cptr) &= ~(FLAGS_PINGSENT | FLAGS_NONL);
717 cli_error(cptr) = errno;
718 /* cptr->flags |= FLAGS_DEADSOCKET; */
724 * For server connections, we process as many as we can without
725 * worrying about the time of day or anything :)
727 if (length > 0 && IsServer(cptr)) {
728 return server_dopacket(cptr, readbuf, length);
732 * Before we even think of parsing what we just read, stick
733 * it on the end of the receive queue and do it when its
736 if (length > 0 && 0 == dbuf_put(&(cli_recvQ(cptr)), readbuf, length)) {
737 return exit_client(cptr, cptr, &me, "dbuf_put fail");
741 * XXX - cptr will always be a user or unregistered
744 DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))
745 return exit_client(cptr, cptr, &me, "Excess Flood");
747 while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
748 (IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10))
751 * If it has become registered as a Server
752 * then skip the per-message parsing below.
754 if (IsServer(cptr)) {
755 dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
756 return (dolen) ? server_dopacket(cptr, readbuf, dolen) : 1;
758 dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
760 * Devious looking...whats it do ? well..if a client
761 * sends a *long* message without any CR or LF, then
762 * dbuf_getmsg fails and we pull it out using this
763 * loop which just gets the next 512 bytes and then
764 * deletes the rest of the buffer contents.
768 if (DBufLength(&(cli_recvQ(cptr))) < 510)
769 cli_flags(cptr) |= FLAGS_NONL;
771 DBufClear(&(cli_recvQ(cptr)));
773 else if (CPTR_KILLED == client_dopacket(cptr, dolen))
777 /* If there's still data to process, wait 2 seconds first */
778 if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
779 !t_onqueue(&(cli_proc(cptr)))) {
780 Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
781 cli_freeflag(cptr) |= FREEFLAG_TIMER;
782 timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
790 * connect_server - start or complete a connection to another server
791 * returns true (1) if successful, false (0) otherwise
793 * aconf must point to a valid C:line
794 * m_connect calls this with a valid by client and a null reply
795 * try_connections calls this with a null by client, and a null reply
796 * connect_dns_callback call this with a null by client, and a valid reply
798 * XXX - if this comes from an m_connect message and a dns query needs to
799 * be done, we loose the information about who started the connection and
800 * it's considered an auto connect.
802 int connect_server(struct ConfItem* aconf, struct Client* by,
803 struct DNSReply* reply)
805 struct Client* cptr = 0;
808 if (aconf->dns_pending) {
809 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
813 Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
814 ircd_ntoa((const char*) &aconf->ipnum)));
816 if ((cptr = FindClient(aconf->name))) {
817 if (IsServer(cptr) || IsMe(cptr)) {
818 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
819 aconf->name, cli_name(cli_from(cptr)));
820 if (by && IsUser(by) && !MyUser(by)) {
821 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
822 "from %s", by, aconf->name, cli_name(cli_from(cptr)));
826 else if (IsHandshake(cptr) || IsConnecting(cptr)) {
827 if (by && IsUser(by)) {
828 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
829 "progress", by, cli_name(cptr));
835 * If we dont know the IP# for this host and itis a hostname and
836 * not a ip# string, then try and find the appropriate host record.
838 if (INADDR_NONE == aconf->ipnum.s_addr) {
839 char buf[HOSTLEN + 1];
841 if (INADDR_NONE == (aconf->ipnum.s_addr = inet_addr(aconf->host))) {
842 struct DNSQuery query;
845 query.callback = connect_dns_callback;
846 host_from_uh(buf, aconf->host, HOSTLEN);
849 reply = gethost_byname(buf, &query);
852 aconf->dns_pending = 1;
855 memcpy(&aconf->ipnum, reply->hp->h_addr, sizeof(struct in_addr));
858 cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
861 cli_dns_reply(cptr) = reply;
864 * Copy these in so we have something for error detection.
866 ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
867 ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
870 * Attach config entries to client here rather than in
871 * completed_connection. This to avoid null pointer references
873 attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
875 if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
876 sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
877 "connecting: no C-line", aconf->name);
878 if (by && IsUser(by) && !MyUser(by)) {
879 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
880 "C-line", by, aconf->name);
882 det_confs_butmask(cptr, 0);
887 * attempt to connect to the server in the conf line
889 if (!connect_inet(aconf, cptr)) {
890 if (by && IsUser(by) && !MyUser(by)) {
891 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
894 det_confs_butmask(cptr, 0);
899 * NOTE: if we're here we have a valid C:Line and the client should
900 * have started the connection and stored the remote address/port and
901 * ip address name in itself
903 * The socket has been connected or connect is in progress.
906 if (by && IsUser(by)) {
907 ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
909 assert(0 == cli_serv(cptr)->user);
910 cli_serv(cptr)->user = cli_user(by);
911 cli_user(by)->refcnt++;
914 *(cli_serv(cptr))->by = '\0';
915 /* strcpy(cptr->serv->by, "Auto"); */
917 cli_serv(cptr)->up = &me;
920 if (cli_fd(cptr) > HighestFd)
921 HighestFd = cli_fd(cptr);
924 LocalClientArray[cli_fd(cptr)] = cptr;
926 Count_newunknown(UserStats);
927 /* Actually we lie, the connect hasn't succeeded yet, but we have a valid
928 * cptr, so we register it now.
929 * Maybe these two calls should be merged.
931 add_client_to_list(cptr);
933 /* nextping = CurrentTime; */
935 return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
936 completed_connection(cptr) : 1;
940 * Setup local socket structure to use for binding to.
942 void set_virtual_host(struct in_addr addr)
944 memset(&VirtualHost, 0, sizeof(VirtualHost));
945 VirtualHost.sin_family = AF_INET;
946 VirtualHost.sin_addr.s_addr = addr.s_addr;
950 * Find the real hostname for the host running the server (or one which
951 * matches the server's name) and its primary IP#. Hostname is stored
952 * in the client structure passed as a pointer.
954 void init_server_identity(void)
956 const struct LocalConf* conf = conf_get_local();
959 ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
960 SetYXXServerName(&me, conf->numeric);
964 * Process events on a client socket
966 static void client_sock_callback(struct Event* ev)
969 struct Connection* con;
973 assert(0 != ev_socket(ev));
974 assert(0 != s_data(ev_socket(ev)));
976 con = s_data(ev_socket(ev));
978 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
980 cptr = con_client(con);
982 assert(0 == cptr || con == cli_connect(cptr));
984 switch (ev_type(ev)) {
986 con_freeflag(con) &= ~FREEFLAG_SOCKET;
988 if (!con_freeflag(con) && !cptr)
989 free_connection(con);
992 case ET_CONNECT: /* socket connection completed */
993 if (!completed_connection(cptr) || IsDead(cptr))
994 fallback = cli_info(cptr);
997 case ET_ERROR: /* an error occurred */
998 fallback = cli_info(cptr);
999 cli_error(cptr) = ev_data(ev);
1000 if (s_state(&(con_socket(con))) == SS_CONNECTING) {
1001 completed_connection(cptr);
1005 case ET_EOF: /* end of file on socket */
1006 Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
1008 cli_flags(cptr) |= FLAGS_DEADSOCKET;
1009 if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
1010 exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
1011 cli_name(cptr), cli_serv(cptr)->last_error_msg);
1014 fmt = "Read error: %s";
1015 fallback = "EOF from client";
1019 case ET_WRITE: /* socket is writable */
1020 cli_flags(cptr) &= ~FLAGS_BLOCKED;
1021 if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
1022 list_next_channels(cptr, 64);
1023 Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
1027 case ET_READ: /* socket is readable */
1028 if (!IsDead(cptr)) {
1029 Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
1030 if (read_packet(cptr, 1) == 0) /* error while reading packet */
1031 fallback = "EOF from client";
1037 abort(); /* unrecognized event */
1042 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
1045 const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
1047 msg = "Unknown error";
1048 exit_client_msg(cptr, cptr, &me, fmt, msg);
1053 * Process a timer on client socket
1055 static void client_timer_callback(struct Event* ev)
1057 struct Client* cptr;
1058 struct Connection* con;
1060 assert(0 != ev_timer(ev));
1061 assert(0 != t_data(ev_timer(ev)));
1062 assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
1064 con = t_data(ev_timer(ev));
1066 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
1068 cptr = con_client(con);
1070 assert(0 == cptr || con == cli_connect(cptr));
1072 if (ev_type(ev)== ET_DESTROY) {
1073 con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
1075 if (!con_freeflag(con) && !cptr)
1076 free_connection(con); /* client is being destroyed */
1078 Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
1080 read_packet(cptr, 0); /* read_packet will re-add timer if needed */
1083 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));