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.
21 * @brief Functions that now (or in the past) relied on BSD APIs.
22 * @version $Id: s_bsd.c 1863 2008-03-15 05:24:14Z entrope $
32 #include "ircd_alloc.h"
34 #include "ircd_features.h"
35 #include "ircd_osdep.h"
36 #include "ircd_reply.h"
37 #include "ircd_snprintf.h"
38 #include "ircd_string.h"
48 #include "querycmds.h"
61 /* #include <assert.h> -- Now using assert in ircd_log.h */
68 #include <sys/ioctl.h>
69 #include <sys/socket.h>
71 #include <sys/utsname.h>
74 /** Array of my own clients, indexed by file descriptor. */
75 struct Client* LocalClientArray[MAXCONNECTIONS];
76 /** Maximum file descriptor in current use. */
78 /** Default local address for outbound IPv4 connections. */
79 struct irc_sockaddr VirtualHost_v4;
80 /** Default local address for outbound IPv6 connections. */
81 struct irc_sockaddr VirtualHost_v6;
82 /** Temporary buffer for reading data from a peer. */
83 static char readbuf[SERVER_TCP_WINDOW];
86 * report_error text constants
88 const char* const ACCEPT_ERROR_MSG = "error accepting connection for %s: %s";
89 const char* const BIND_ERROR_MSG = "bind error for %s: %s";
90 const char* const CONNECT_ERROR_MSG = "connect to host %s failed: %s";
91 const char* const CONNLIMIT_ERROR_MSG = "connect limit exceeded for %s: %s";
92 const char* const LISTEN_ERROR_MSG = "listen error for %s: %s";
93 const char* const NONB_ERROR_MSG = "error setting non-blocking for %s: %s";
94 const char* const PEERNAME_ERROR_MSG = "getpeername failed for %s: %s";
95 const char* const POLL_ERROR_MSG = "poll error for %s: %s";
96 const char* const REGISTER_ERROR_MSG = "registering %s: %s";
97 const char* const REUSEADDR_ERROR_MSG = "error setting SO_REUSEADDR for %s: %s";
98 const char* const SELECT_ERROR_MSG = "select error for %s: %s";
99 const char* const SETBUFS_ERROR_MSG = "error setting buffer size for %s: %s";
100 const char* const SOCKET_ERROR_MSG = "error creating socket for %s: %s";
101 const char* const TOS_ERROR_MSG = "error setting TOS for %s: %s";
104 static void client_timer_callback(struct Event* ev);
108 * Cannot use perror() within daemon. stderr is closed in
109 * ircd and cannot be used. And, worse yet, it might have
110 * been reassigned to a normal connection...
113 /** Replacement for perror(). Record error to log. Send a copy to all
114 * *LOCAL* opers, but only if no errors were sent to them in the last
116 * @param text A *format* string for outputting error. It must contain
117 * only two '%s', the first will be replaced by the sockhost from the
118 * cptr, and the latter will be taken from sys_errlist[errno].
119 * @param who The client associated with the error.
120 * @param err The errno value to display.
122 void report_error(const char* text, const char* who, int err)
124 static time_t last_notice = 0;
125 int errtmp = errno; /* debug may change 'errno' */
126 const char* errmsg = (err) ? strerror(err) : "";
129 errmsg = "Unknown error";
131 if (EmptyString(who))
134 sendto_opmask_butone_ratelimited(0, SNO_OLDSNO, &last_notice, text, who, errmsg);
135 log_write(LS_SOCKET, L_ERROR, 0, text, who, errmsg);
140 /** Called when resolver query finishes. If the DNS lookup was
141 * successful, start the connection; otherwise notify opers of the
143 * @param vptr The struct ConfItem representing the Connect block.
144 * @param hp A pointer to the DNS lookup results (NULL on failure).
146 static void connect_dns_callback(void* vptr, const struct irc_in_addr *addr, const char *h_name)
148 struct ConfItem* aconf = (struct ConfItem*) vptr;
150 aconf->dns_pending = 0;
152 memcpy(&aconf->address, addr, sizeof(aconf->address));
153 connect_server(aconf, 0);
156 sendto_opmask_butone(0, SNO_OLDSNO, "Connect to %s failed: host lookup",
160 /* Helper routines */
161 static IOResult client_recv(struct Client *cptr, char *buf, unsigned int length, unsigned int *count_out)
163 if (cli_socket(cptr).ssl)
164 return ssl_recv(cli_fd(cptr), cli_socket(cptr).ssl, buf, length, count_out);
166 return os_recv_nonb(cli_fd(cptr), buf, length, count_out);
169 static IOResult client_sendv(struct Client *cptr, struct MsgQ *buf, unsigned int *count_in, unsigned int *count_out)
171 if (cli_socket(cptr).ssl)
172 return ssl_sendv(cli_fd(cptr), cli_socket(cptr).ssl, buf, count_in, count_out);
174 return os_sendv_nonb(cli_fd(cptr), buf, count_in, count_out);
177 /** Closes all file descriptors.
178 * @param close_stderr If non-zero, also close stderr.
180 void close_connections(int close_stderr)
189 for (i = 3; i < MAXCONNECTIONS; ++i)
193 /** Initialize process fd limit to MAXCONNECTIONS.
195 int init_connection_limits(void)
197 int limit = os_set_fdlimit(MAXCONNECTIONS);
201 fprintf(stderr, "error setting max fds to %d: %s\n", limit, strerror(errno));
203 else if (limit > 0) {
204 fprintf(stderr, "ircd fd table too big\nHard Limit: %d IRC max: %d\n",
205 limit, MAXCONNECTIONS);
206 fprintf(stderr, "set MAXCONNECTIONS to a smaller value");
211 /** Set up address and port and make a connection.
212 * @param aconf Provides the connection information.
213 * @param cptr Client structure for the peer.
214 * @return Non-zero on success; zero on failure.
216 static int connect_inet(struct ConfItem* aconf, struct Client* cptr)
218 const struct irc_sockaddr *local;
225 * Might as well get sockhost from here, the connection is attempted
226 * with it so if it fails its useless.
228 if (irc_in_addr_valid(&aconf->origin.addr))
229 local = &aconf->origin;
230 else if (irc_in_addr_is_ipv4(&aconf->address.addr)) {
231 local = &VirtualHost_v4;
234 local = &VirtualHost_v6;
235 cli_fd(cptr) = os_socket(local, SOCK_STREAM, cli_name(cptr), family);
236 if (cli_fd(cptr) < 0)
240 * save connection info in client
242 memcpy(&cli_ip(cptr), &aconf->address.addr, sizeof(cli_ip(cptr)));
243 ircd_ntoa_r(cli_sock_ip(cptr), &cli_ip(cptr));
245 * we want a big buffer for server connections
247 if (!os_set_sockbufs(cli_fd(cptr), feature_int(FEAT_SOCKSENDBUF), feature_int(FEAT_SOCKRECVBUF))) {
248 cli_error(cptr) = errno;
249 report_error(SETBUFS_ERROR_MSG, cli_name(cptr), errno);
255 * Set the TOS bits - this is nonfatal if it doesn't stick.
257 if (!os_set_tos(cli_fd(cptr), FEAT_TOS_SERVER)) {
258 report_error(TOS_ERROR_MSG, cli_name(cptr), errno);
260 if ((result = os_connect_nonb(cli_fd(cptr), &aconf->address)) == IO_FAILURE) {
261 cli_error(cptr) = errno;
262 report_error(CONNECT_ERROR_MSG, cli_name(cptr), errno);
267 if (!socket_add(&(cli_socket(cptr)), client_sock_callback,
268 (void*) cli_connect(cptr),
269 (result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
270 SOCK_EVENT_READABLE, cli_fd(cptr))) {
271 cli_error(cptr) = ENFILE;
272 report_error(REGISTER_ERROR_MSG, cli_name(cptr), ENFILE);
277 cli_freeflag(cptr) |= FREEFLAG_SOCKET;
281 /** Attempt to send a sequence of bytes to the connection.
282 * As a side effect, updates \a cptr's FLAG_BLOCKED setting
283 * and sendB/sendK fields.
284 * @param cptr Client that should receive data.
285 * @param buf Message buffer to send to client.
286 * @return Negative on connection-fatal error; otherwise
287 * number of bytes sent.
289 unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf)
291 unsigned int bytes_written = 0;
292 unsigned int bytes_count = 0;
295 switch (client_sendv(cptr, buf, &bytes_count, &bytes_written)) {
297 ClrFlag(cptr, FLAG_BLOCKED);
299 cli_sendB(cptr) += bytes_written;
300 cli_sendB(&me) += bytes_written;
301 /* A partial write implies that future writes will block. */
302 if (bytes_written < bytes_count)
303 SetFlag(cptr, FLAG_BLOCKED);
306 SetFlag(cptr, FLAG_BLOCKED);
309 cli_error(cptr) = errno;
310 SetFlag(cptr, FLAG_DEADSOCKET);
313 return bytes_written;
316 /** Complete non-blocking connect()-sequence. Check access and
317 * terminate connection, if trouble detected.
318 * @param cptr Client to which we have connected, with all ConfItem structs attached.
319 * @return Zero on failure (caller should exit_client()), non-zero on success.
321 int completed_connection(struct Client* cptr)
323 struct ConfItem *aconf;
325 struct Client *acptr;
331 * get the socket status from the fd first to check if
332 * connection actually succeeded
334 if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) {
335 const char* msg = strerror(cli_error(cptr));
337 msg = "Unknown error";
338 sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s",
339 cli_name(cptr), msg);
342 if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) {
343 sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr));
346 if (s_state(&(cli_socket(cptr))) == SS_CONNECTING)
347 socket_state(&(cli_socket(cptr)), SS_CONNECTED);
349 /* Check whether we have to secure the connection.
350 * Server<->Server encryption requires us to pass the FD to the SSL module
351 * now which performs the handshake and later calls this function again.
353 * When this function is called again, there is either an error, which occurred,
354 * or the handshake completed and we continue without passing it to the SSL
357 if(!cli_socket(cptr).ssl && (aconf->flags & CONF_SECURE)) {
358 return ssl_connect(cptr);
361 if (!EmptyString(aconf->passwd))
362 sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
365 * Create a unique timestamp
368 for (i = HighestFd; i > -1; --i) {
369 if ((acptr = LocalClientArray[i]) &&
370 (IsServer(acptr) || IsHandshake(acptr))) {
371 if (cli_serv(acptr)->timestamp >= newts)
372 newts = cli_serv(acptr)->timestamp + 1;
375 assert(0 != cli_serv(cptr));
377 cli_serv(cptr)->timestamp = newts;
380 * Make us timeout after twice the timeout for DNS look ups
382 cli_lasttime(cptr) = CurrentTime;
385 sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s6 :%s",
386 cli_name(&me), cli_serv(&me)->timestamp, newts,
387 MAJOR_PROTOCOL, NumServCap(&me),
388 feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me));
390 return (IsDead(cptr)) ? 0 : 1;
393 /** Close the physical connection. Side effects: MyConnect(cptr)
394 * becomes false and cptr->from becomes NULL.
395 * @param cptr Client to disconnect.
397 void close_connection(struct Client *cptr)
399 struct ConfItem* aconf;
401 if (IsServer(cptr)) {
402 ServerStats->is_sv++;
403 ServerStats->is_sbs += cli_sendB(cptr);
404 ServerStats->is_sbr += cli_receiveB(cptr);
405 ServerStats->is_sti += CurrentTime - cli_firsttime(cptr);
407 * If the connection has been up for a long amount of time, schedule
408 * a 'quick' reconnect, else reset the next-connect cycle.
410 if ((aconf = find_conf_exact(cli_name(cptr), cptr, CONF_SERVER))) {
412 * Reschedule a faster reconnect, if this was a automatically
413 * connected configuration entry. (Note that if we have had
414 * a rehash in between, the status has been changed to
415 * CONF_ILLEGAL). But only do this if it was a "good" link.
417 aconf->hold = CurrentTime;
418 aconf->hold += ((aconf->hold - cli_since(cptr) >
419 feature_int(FEAT_HANGONGOODLINK)) ?
420 feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf));
421 /* if (nextconnect > aconf->hold) */
422 /* nextconnect = aconf->hold; */
425 else if (IsUser(cptr)) {
426 ServerStats->is_cl++;
427 ServerStats->is_cbs += cli_sendB(cptr);
428 ServerStats->is_cbr += cli_receiveB(cptr);
429 ServerStats->is_cti += CurrentTime - cli_firsttime(cptr);
432 ServerStats->is_ni++;
434 if (-1 < cli_fd(cptr)) {
435 flush_connections(cptr);
436 LocalClientArray[cli_fd(cptr)] = 0;
438 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
441 SetFlag(cptr, FLAG_DEADSOCKET);
443 MsgQClear(&(cli_sendQ(cptr)));
444 client_drop_sendq(cli_connect(cptr));
445 DBufClear(&(cli_recvQ(cptr)));
446 memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr)));
447 set_snomask(cptr, 0, SNO_SET);
449 det_confs_butmask(cptr, 0);
451 if (cli_listener(cptr)) {
452 release_listener(cli_listener(cptr));
453 cli_listener(cptr) = 0;
456 for ( ; HighestFd > 0; --HighestFd) {
457 if (LocalClientArray[HighestFd])
463 * Switches a client's connection over to a different, zombied client.
465 * @param source client to attach to zombied client
466 * @param target zombied client
468 void connection_switch_to_client(struct Client *source, struct Client *target)
470 assert(IsNotConn(target));
471 assert(MyConnect(source));
472 assert(-1 < cli_fd(source));
473 cli_connect(target) = cli_connect(source);
474 /* conveniently, this makes it much easier to get rid of source later on */
475 cli_from(target) = target;
476 LocalClientArray[cli_fd(source)] = target;
478 /* make main loop remove source soonish */
479 SetFlag(source, FLAG_DEADSOCKET);
481 /* need to copy over data from old client */
482 cli_user(target)->server = cli_user(source)->server;
483 strcpy(cli_yxx(target), cli_yxx(source));
484 cli_hopcount(target) = cli_hopcount(source);
485 cli_ip(target) = cli_ip(source);
486 strcpy(cli_username(target), cli_username(source));
487 strcpy(cli_user(target)->realhost, cli_user(source)->realhost);
490 /** Close all unregistered connections.
491 * @param source Oper who requested the close.
492 * @return Number of closed connections.
494 int net_close_unregistered_connections(struct Client* source)
501 for (i = HighestFd; i > 0; --i) {
502 if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) {
503 send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP));
504 exit_client(source, cptr, &me, "Oper Closing");
511 /** Creates a client which has just connected to us on the given fd.
512 * The sockhost field is initialized with the ip# of the host.
513 * The client is not added to the linked list of clients, it is
514 * passed off to the auth handler for dns and ident queries.
515 * @param listener Listening socket that received the connection.
516 * @param fd File descriptor of new connection.
518 void add_connection(struct Listener* listener, int fd, ssl_session_t *ssl) {
519 struct irc_sockaddr addr;
520 struct Client *new_client;
521 time_t next_target = 0;
523 const char* const throttle_message =
524 "ERROR :Your host is trying to (re)connect too fast -- throttled\r\n";
525 /* 12345678901234567890123456789012345679012345678901234567890123456 */
526 const char* const register_message =
527 "ERROR :Unable to complete your registration\r\n";
529 assert(0 != listener);
532 * Removed preliminary access check. Full check is performed in m_server and
533 * m_user instead. Also connection time out help to get rid of unwanted
536 if (!os_get_peername(fd, &addr) || !os_set_nonblocking(fd)) {
537 ++ServerStats->is_ref;
538 ssl_close(fd, ssl, NULL, 0);
542 * Disable IP (*not* TCP) options. In particular, this makes it impossible
543 * to use source routing to connect to the server. If we didn't do this
544 * (and if intermediate networks didn't drop source-routed packets), an
545 * attacker could successfully IP spoof us...and even return the anti-spoof
546 * ping, because the options would cause the packet to be routed back to
547 * the spoofer's machine. When we disable the IP options, we delete the
548 * source route, and the normal routing takes over.
550 os_disable_options(fd);
552 if (listener_server(listener))
554 new_client = make_client(0, STAT_UNKNOWN_SERVER);
559 * Add this local client to the IPcheck registry.
561 * If they're throttled, murder them, but tell them why first.
563 if (!IPcheck_local_connect(&addr.addr, &next_target))
565 ++ServerStats->is_ref;
566 ssl_close(fd, ssl, throttle_message, strlen(throttle_message));
569 new_client = make_client(0, STAT_UNKNOWN_USER);
570 SetIPChecked(new_client);
574 * Copy ascii address to 'sockhost' just in case. Then we have something
575 * valid to put into error messages...
577 ircd_ntoa_r(cli_sock_ip(new_client), &addr.addr);
578 strcpy(cli_sockhost(new_client), cli_sock_ip(new_client));
579 memcpy(&cli_ip(new_client), &addr.addr, sizeof(cli_ip(new_client)));
582 cli_nexttarget(new_client) = next_target;
584 cli_fd(new_client) = fd;
585 if (!socket_add(&(cli_socket(new_client)), client_sock_callback,
586 (void*) cli_connect(new_client), SS_CONNECTED, 0, fd)) {
587 ++ServerStats->is_ref;
588 ssl_close(fd, ssl, register_message, strlen(register_message));
589 cli_fd(new_client) = -1;
592 cli_socket(new_client).ssl = ssl;
593 cli_freeflag(new_client) |= FREEFLAG_SOCKET;
594 cli_listener(new_client) = listener;
595 ++listener->ref_count;
597 Count_newunknown(UserStats);
598 /* if we've made it this far we can put the client on the auth query pile */
599 start_auth(new_client);
602 /** Determines whether to tell the events engine we're interested in
604 * @param cptr Client for which to decide this.
606 void update_write(struct Client* cptr)
608 /* If there are messages that need to be sent along, or if the client
609 * is in the middle of a /list, then we need to tell the engine that
610 * we're interested in writable events--otherwise, we need to drop
613 socket_events(&(cli_socket(cptr)),
614 ((MsgQLength(&cli_sendQ(cptr)) || cli_listing(cptr)) ?
615 SOCK_ACTION_ADD : SOCK_ACTION_DEL) | SOCK_EVENT_WRITABLE);
618 /** Read a 'packet' of data from a connection and process it. Read in
619 * 8k chunks to give a better performance rating (for server
620 * connections). Do some tricky stuff for client connections to make
621 * sure they don't do any flooding >:-) -avalon
622 * @param cptr Client from which to read data.
623 * @param socket_ready If non-zero, more data can be read from the client's socket.
624 * @return Positive number on success, zero on connection-fatal failure, negative
627 static int read_packet(struct Client *cptr, int socket_ready)
629 unsigned int dolen = 0;
630 unsigned int length = 0;
631 unsigned int client_flood = feature_int(FEAT_CLIENT_FLOOD) * (HasPriv(cptr, PRIV_HALFFLOOD) ? 4 : 1);
634 !(IsUser(cptr) && !HasPriv(cptr, PRIV_FLOOD) &&
635 DBufLength(&(cli_recvQ(cptr))) > client_flood)) {
636 switch (client_recv(cptr, readbuf, sizeof(readbuf), &length)) {
640 cli_lasttime(cptr) = CurrentTime;
642 ClrFlag(cptr, FLAG_NONL);
643 if (cli_lasttime(cptr) > cli_since(cptr))
644 cli_since(cptr) = cli_lasttime(cptr);
650 cli_error(cptr) = errno;
651 /* SetFlag(cptr, FLAG_DEADSOCKET); */
657 * For server connections, we process as many as we can without
658 * worrying about the time of day or anything :)
660 if (length > 0 && IsServer(cptr))
661 return server_dopacket(cptr, readbuf, length);
662 else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr) || HasPriv(cptr, PRIV_FLOOD)))
663 return connect_dopacket(cptr, readbuf, length);
667 * Before we even think of parsing what we just read, stick
668 * it on the end of the receive queue and do it when its
671 if (length > 0 && dbuf_put(&(cli_recvQ(cptr)), readbuf, length) == 0)
672 return exit_client(cptr, cptr, &me, "dbuf_put fail");
674 if (!HasPriv(cptr, PRIV_FLOOD) && DBufLength(&(cli_recvQ(cptr))) > client_flood)
675 return exit_client(cptr, cptr, &me, "Excess Flood");
677 while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
678 (IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10))
680 dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
682 * Devious looking...whats it do ? well..if a client
683 * sends a *long* message without any CR or LF, then
684 * dbuf_getmsg fails and we pull it out using this
685 * loop which just gets the next 512 bytes and then
686 * deletes the rest of the buffer contents.
691 if (DBufLength(&(cli_recvQ(cptr))) < 510)
692 SetFlag(cptr, FLAG_NONL);
695 /* More than 512 bytes in the line - drop the input and yell
698 DBufClear(&(cli_recvQ(cptr)));
699 send_reply(cptr, ERR_INPUTTOOLONG);
702 else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
705 * If it has become registered as a Server
706 * then skip the per-message parsing below.
708 if (IsHandshake(cptr) || IsServer(cptr))
712 dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
717 if (DBufLength(&(cli_recvQ(cptr))) < 510)
718 SetFlag(cptr, FLAG_NONL);
720 DBufClear(&(cli_recvQ(cptr)));
722 else if ((IsServer(cptr) &&
723 server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
725 connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
731 /* If there's still data to process, wait 2 seconds first */
732 if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
733 !t_onqueue(&(cli_proc(cptr))))
735 Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
736 cli_freeflag(cptr) |= FREEFLAG_TIMER;
737 timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
744 /** Start a connection to another server.
745 * @param aconf Connect block data for target server.
746 * @param by Client who requested the connection (if any).
747 * @return Non-zero on success; zero on failure.
749 int connect_server(struct ConfItem* aconf, struct Client* by)
751 struct Client* cptr = 0;
754 if (aconf->dns_pending) {
755 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
759 Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
760 ircd_ntoa(&aconf->address.addr)));
762 if ((cptr = FindClient(aconf->name))) {
763 if (IsServer(cptr) || IsMe(cptr)) {
764 sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
765 aconf->name, cli_name(cli_from(cptr)));
766 if (by && IsUser(by) && !MyUser(by)) {
767 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
768 "from %s", by, aconf->name, cli_name(cli_from(cptr)));
772 else if (IsHandshake(cptr) || IsConnecting(cptr)) {
773 if (by && IsUser(by)) {
774 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
775 "progress", by, cli_name(cptr));
781 * If we don't know the IP# for this host and it is a hostname and
782 * not a ip# string, then try and find the appropriate host record.
784 if (!irc_in_addr_valid(&aconf->address.addr)
785 && !ircd_aton(&aconf->address.addr, aconf->host)) {
786 char buf[HOSTLEN + 1];
788 host_from_uh(buf, aconf->host, HOSTLEN);
789 gethost_byname(buf, connect_dns_callback, aconf);
790 aconf->dns_pending = 1;
793 cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
796 * Copy these in so we have something for error detection.
798 ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
799 ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
802 * Attach config entries to client here rather than in
803 * completed_connection. This to avoid null pointer references
805 attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
807 if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
808 sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
809 "connecting: no Connect block", aconf->name);
810 if (by && IsUser(by) && !MyUser(by)) {
811 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
812 "Connect block", by, aconf->name);
814 det_confs_butmask(cptr, 0);
819 * attempt to connect to the server in the conf line
821 if (!connect_inet(aconf, cptr)) {
822 if (by && IsUser(by) && !MyUser(by)) {
823 sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
826 det_confs_butmask(cptr, 0);
831 * NOTE: if we're here we have a valid C:Line and the client should
832 * have started the connection and stored the remote address/port and
833 * ip address name in itself
835 * The socket has been connected or connect is in progress.
838 if (by && IsUser(by)) {
839 ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
841 assert(0 == cli_serv(cptr)->user);
842 cli_serv(cptr)->user = cli_user(by);
843 cli_user(by)->refcnt++;
846 *(cli_serv(cptr))->by = '\0';
847 /* strcpy(cptr->serv->by, "Auto"); */
849 cli_serv(cptr)->up = &me;
852 if (cli_fd(cptr) > HighestFd)
853 HighestFd = cli_fd(cptr);
855 LocalClientArray[cli_fd(cptr)] = cptr;
857 Count_newunknown(UserStats);
858 /* Actually we lie, the connect hasn't succeeded yet, but we have a valid
859 * cptr, so we register it now.
860 * Maybe these two calls should be merged.
862 add_client_to_list(cptr);
864 /* nextping = CurrentTime; */
866 return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
867 completed_connection(cptr) : 1;
870 /** Find the real hostname for the host running the server (or one which
871 * matches the server's name) and its primary IP#. Hostname is stored
872 * in the client structure passed as a pointer.
874 void init_server_identity(void)
876 const struct LocalConf* conf = conf_get_local();
879 ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
880 SetYXXServerName(&me, conf->numeric);
883 /** Process events on a client socket.
884 * @param ev Socket event structure that has a struct Connection as
885 * its associated data.
887 void client_sock_callback(struct Event* ev)
890 struct Connection* con;
894 assert(0 != ev_socket(ev));
895 assert(0 != s_data(ev_socket(ev)));
897 con = (struct Connection*) s_data(ev_socket(ev));
899 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
901 cptr = con_client(con);
903 assert(0 == cptr || con == cli_connect(cptr));
905 switch (ev_type(ev)) {
907 con_freeflag(con) &= ~FREEFLAG_SOCKET;
909 if (!con_freeflag(con) && !cptr)
910 free_connection(con);
912 if(ev_socket(ev)->ssl) ssl_session_free(ev_socket(ev)->ssl);
915 case ET_CONNECT: /* socket connection completed */
916 if (!completed_connection(cptr) || IsDead(cptr))
917 fallback = cli_info(cptr);
920 case ET_ERROR: /* an error occurred */
921 fallback = cli_info(cptr);
922 cli_error(cptr) = ev_data(ev);
923 if (s_state(&(con_socket(con))) == SS_CONNECTING) {
924 completed_connection(cptr);
925 /* for some reason, the os_get_sockerr() in completed_connect()
926 * can return 0 even when ev_data(ev) indicates a real error, so
927 * re-assign the client error here.
929 cli_error(cptr) = ev_data(ev);
933 case ET_EOF: /* end of file on socket */
934 Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
936 SetFlag(cptr, FLAG_DEADSOCKET);
937 if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
938 exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
939 cli_name(cptr), cli_serv(cptr)->last_error_msg);
942 fmt = "Read error: %s";
943 fallback = "EOF from client";
947 case ET_WRITE: /* socket is writable */
948 ClrFlag(cptr, FLAG_BLOCKED);
949 if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
950 list_next_channels(cptr);
951 Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
955 case ET_READ: /* socket is readable */
957 Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
958 if (read_packet(cptr, 1) == 0) /* error while reading packet */
959 fallback = "EOF from client";
964 assert(0 && "Unrecognized socket event in client_sock_callback()");
968 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
971 const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
973 msg = "Unknown error";
974 exit_client_msg(cptr, cptr, &me, fmt, msg);
978 /** Process a timer on client socket.
979 * @param ev Timer event that has a struct Connection as its
982 static void client_timer_callback(struct Event* ev)
985 struct Connection* con;
987 assert(0 != ev_timer(ev));
988 assert(0 != t_data(ev_timer(ev)));
989 assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
991 con = (struct Connection*) t_data(ev_timer(ev));
993 assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
995 cptr = con_client(con);
997 assert(0 == cptr || con == cli_connect(cptr));
999 if (ev_type(ev)== ET_DESTROY) {
1000 con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
1002 if (!con_freeflag(con) && !cptr)
1003 free_connection(con); /* client is being destroyed */
1005 Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
1007 read_packet(cptr, 0); /* read_packet will re-add timer if needed */
1010 assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));