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root/svn/ircd-hybrid/trunk/src/s_bsd.c
Revision: 992
Committed: Mon Aug 17 19:19:16 2009 UTC (14 years, 7 months ago) by michael
Content type: text/x-csrc
Original Path: ircd-hybrid-7.2/src/s_bsd.c
File size: 22248 byte(s)
Log Message:
- fix possible auth/dns related memleaks

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * s_bsd.c: Network functions.
4 *
5 * Copyright (C) 2002 by the past and present ircd coders, and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * $Id$
23 */
24
25 #include "stdinc.h"
26 #ifndef _WIN32
27 #include <netinet/in_systm.h>
28 #include <netinet/ip.h>
29 #include <netinet/tcp.h>
30 #endif
31 #include "fdlist.h"
32 #include "s_bsd.h"
33 #include "client.h"
34 #include "common.h"
35 #include "dbuf.h"
36 #include "event.h"
37 #include "irc_string.h"
38 #include "irc_getnameinfo.h"
39 #include "irc_getaddrinfo.h"
40 #include "ircd.h"
41 #include "list.h"
42 #include "listener.h"
43 #include "numeric.h"
44 #include "packet.h"
45 #include "irc_res.h"
46 #include "inet_misc.h"
47 #include "restart.h"
48 #include "s_auth.h"
49 #include "s_conf.h"
50 #include "s_log.h"
51 #include "s_serv.h"
52 #include "send.h"
53 #include "memory.h"
54 #include "s_user.h"
55 #include "hook.h"
56
57 static const char *comm_err_str[] = { "Comm OK", "Error during bind()",
58 "Error during DNS lookup", "connect timeout", "Error during connect()",
59 "Comm Error" };
60
61 struct Callback *setup_socket_cb = NULL;
62
63 static void comm_connect_callback(fde_t *fd, int status);
64 static PF comm_connect_timeout;
65 static void comm_connect_dns_callback(void *, const struct irc_ssaddr *, const char *);
66 static PF comm_connect_tryconnect;
67
68
69 /* check_can_use_v6()
70 * Check if the system can open AF_INET6 sockets
71 */
72 void
73 check_can_use_v6(void)
74 {
75 #ifdef IPV6
76 int v6;
77
78 if ((v6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0)
79 ServerInfo.can_use_v6 = 0;
80 else
81 {
82 ServerInfo.can_use_v6 = 1;
83 #ifdef _WIN32
84 closesocket(v6);
85 #else
86 close(v6);
87 #endif
88 }
89 #else
90 ServerInfo.can_use_v6 = 0;
91 #endif
92 }
93
94 /* get_sockerr - get the error value from the socket or the current errno
95 *
96 * Get the *real* error from the socket (well try to anyway..).
97 * This may only work when SO_DEBUG is enabled but its worth the
98 * gamble anyway.
99 */
100 int
101 get_sockerr(int fd)
102 {
103 #ifndef _WIN32
104 int errtmp = errno;
105 #else
106 int errtmp = WSAGetLastError();
107 #endif
108 #ifdef SO_ERROR
109 int err = 0;
110 socklen_t len = sizeof(err);
111
112 if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len))
113 {
114 if (err)
115 errtmp = err;
116 }
117 errno = errtmp;
118 #endif
119 return errtmp;
120 }
121
122 /*
123 * report_error - report an error from an errno.
124 * Record error to log and also send a copy to all *LOCAL* opers online.
125 *
126 * text is a *format* string for outputing error. It must
127 * contain only two '%s', the first will be replaced
128 * by the sockhost from the client_p, and the latter will
129 * be taken from sys_errlist[errno].
130 *
131 * client_p if not NULL, is the *LOCAL* client associated with
132 * the error.
133 *
134 * Cannot use perror() within daemon. stderr is closed in
135 * ircd and cannot be used. And, worse yet, it might have
136 * been reassigned to a normal connection...
137 *
138 * Actually stderr is still there IFF ircd was run with -s --Rodder
139 */
140
141 void
142 report_error(int level, const char* text, const char* who, int error)
143 {
144 who = (who) ? who : "";
145
146 sendto_realops_flags(UMODE_DEBUG, level, text, who, strerror(error));
147 log_oper_action(LOG_IOERR_TYPE, NULL, "%s %s %s\n", who, text, strerror(error));
148 ilog(L_ERROR, text, who, strerror(error));
149 }
150
151 /*
152 * setup_socket()
153 *
154 * Set the socket non-blocking, and other wonderful bits.
155 */
156 static void *
157 setup_socket(va_list args)
158 {
159 int fd = va_arg(args, int);
160 int opt = 1;
161
162 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
163
164 #ifdef IPTOS_LOWDELAY
165 opt = IPTOS_LOWDELAY;
166 setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
167 #endif
168
169 #ifndef _WIN32
170 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
171 #endif
172
173 return NULL;
174 }
175
176 /*
177 * init_comm()
178 *
179 * Initializes comm subsystem.
180 */
181 void
182 init_comm(void)
183 {
184 setup_socket_cb = register_callback("setup_socket", setup_socket);
185 init_netio();
186 }
187
188 /*
189 * close_connection
190 * Close the physical connection. This function must make
191 * MyConnect(client_p) == FALSE, and set client_p->from == NULL.
192 */
193 void
194 close_connection(struct Client *client_p)
195 {
196 struct ConfItem *conf;
197 struct AccessItem *aconf;
198 struct ClassItem *aclass;
199
200 assert(NULL != client_p);
201
202 if (!IsDead(client_p))
203 {
204 /* attempt to flush any pending dbufs. Evil, but .. -- adrian */
205 /* there is still a chance that we might send data to this socket
206 * even if it is marked as blocked (COMM_SELECT_READ handler is called
207 * before COMM_SELECT_WRITE). Let's try, nothing to lose.. -adx
208 */
209 ClearSendqBlocked(client_p);
210 send_queued_write(client_p);
211 }
212
213 if (IsServer(client_p))
214 {
215 ++ServerStats.is_sv;
216 ServerStats.is_sbs += client_p->localClient->send.bytes;
217 ServerStats.is_sbr += client_p->localClient->recv.bytes;
218 ServerStats.is_sti += CurrentTime - client_p->firsttime;
219
220 /* XXX Does this even make any sense at all anymore?
221 * scheduling a 'quick' reconnect could cause a pile of
222 * nick collides under TSora protocol... -db
223 */
224 /*
225 * If the connection has been up for a long amount of time, schedule
226 * a 'quick' reconnect, else reset the next-connect cycle.
227 */
228 if ((conf = find_conf_exact(SERVER_TYPE,
229 client_p->name, client_p->username,
230 client_p->host)))
231 {
232 /*
233 * Reschedule a faster reconnect, if this was a automatically
234 * connected configuration entry. (Note that if we have had
235 * a rehash in between, the status has been changed to
236 * CONF_ILLEGAL). But only do this if it was a "good" link.
237 */
238 aconf = (struct AccessItem *)map_to_conf(conf);
239 aclass = (struct ClassItem *)map_to_conf(aconf->class_ptr);
240 aconf->hold = time(NULL);
241 aconf->hold += (aconf->hold - client_p->since > HANGONGOODLINK) ?
242 HANGONRETRYDELAY : ConFreq(aclass);
243 if (nextconnect > aconf->hold)
244 nextconnect = aconf->hold;
245 }
246 }
247 else if (IsClient(client_p))
248 {
249 ++ServerStats.is_cl;
250 ServerStats.is_cbs += client_p->localClient->send.bytes;
251 ServerStats.is_cbr += client_p->localClient->recv.bytes;
252 ServerStats.is_cti += CurrentTime - client_p->firsttime;
253 }
254 else
255 ++ServerStats.is_ni;
256
257 #ifdef HAVE_LIBCRYPTO
258 if (client_p->localClient->fd.ssl)
259 {
260 SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN);
261
262 if (!SSL_shutdown(client_p->localClient->fd.ssl))
263 SSL_shutdown(client_p->localClient->fd.ssl);
264 }
265 #endif
266 if (client_p->localClient->fd.flags.open)
267 fd_close(&client_p->localClient->fd);
268
269 if (HasServlink(client_p))
270 {
271 if (client_p->localClient->ctrlfd.flags.open)
272 fd_close(&client_p->localClient->ctrlfd);
273 }
274
275 dbuf_clear(&client_p->localClient->buf_sendq);
276 dbuf_clear(&client_p->localClient->buf_recvq);
277
278 MyFree(client_p->localClient->passwd);
279 detach_conf(client_p, CONF_TYPE);
280 client_p->from = NULL; /* ...this should catch them! >:) --msa */
281 }
282
283 #ifdef HAVE_LIBCRYPTO
284 /*
285 * ssl_handshake - let OpenSSL initialize the protocol. Register for
286 * read/write events if necessary.
287 */
288 static void
289 ssl_handshake(int fd, struct Client *client_p)
290 {
291 int ret = SSL_accept(client_p->localClient->fd.ssl);
292
293 if (ret <= 0)
294 switch (SSL_get_error(client_p->localClient->fd.ssl, ret))
295 {
296 case SSL_ERROR_WANT_WRITE:
297 comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE,
298 (PF *) ssl_handshake, client_p, 0);
299 return;
300
301 case SSL_ERROR_WANT_READ:
302 comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ,
303 (PF *) ssl_handshake, client_p, 0);
304 return;
305
306 default:
307 exit_client(client_p, client_p, "Error during SSL handshake");
308 return;
309 }
310
311 execute_callback(auth_cb, client_p);
312 }
313 #endif
314
315 /*
316 * add_connection - creates a client which has just connected to us on
317 * the given fd. The sockhost field is initialized with the ip# of the host.
318 * An unique id is calculated now, in case it is needed for auth.
319 * The client is sent to the auth module for verification, and not put in
320 * any client list yet.
321 */
322 void
323 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
324 {
325 struct Client *new_client;
326
327 assert(NULL != listener);
328
329 new_client = make_client(NULL);
330
331 fd_open(&new_client->localClient->fd, fd, 1,
332 (listener->flags & LISTENER_SSL) ?
333 "Incoming SSL connection" : "Incoming connection");
334
335 /*
336 * copy address to 'sockhost' as a string, copy it to host too
337 * so we have something valid to put into error messages...
338 */
339 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
340
341 irc_getnameinfo((struct sockaddr*)&new_client->localClient->ip,
342 new_client->localClient->ip.ss_len, new_client->sockhost,
343 HOSTIPLEN, NULL, 0, NI_NUMERICHOST);
344 new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
345 #ifdef IPV6
346 if (new_client->sockhost[0] == ':')
347 strlcat(new_client->host, "0", HOSTLEN+1);
348
349 if (new_client->localClient->aftype == AF_INET6 &&
350 ConfigFileEntry.dot_in_ip6_addr == 1)
351 {
352 strlcat(new_client->host, new_client->sockhost,HOSTLEN+1);
353 strlcat(new_client->host, ".", HOSTLEN+1);
354 }
355 else
356 #endif
357 strlcat(new_client->host, new_client->sockhost,HOSTLEN+1);
358
359 new_client->localClient->listener = listener;
360 ++listener->ref_count;
361
362 #ifdef HAVE_LIBCRYPTO
363 if (listener->flags & LISTENER_SSL)
364 {
365 if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL)
366 {
367 ilog(L_CRIT, "SSL_new() ERROR! -- %s",
368 ERR_error_string(ERR_get_error(), NULL));
369
370 SetDead(new_client);
371 exit_client(new_client, new_client, "SSL_new failed");
372 return;
373 }
374
375 SSL_set_fd(new_client->localClient->fd.ssl, fd);
376 ssl_handshake(0, new_client);
377 }
378 else
379 #endif
380 execute_callback(auth_cb, new_client);
381 }
382
383 /*
384 * stolen from squid - its a neat (but overused! :) routine which we
385 * can use to see whether we can ignore this errno or not. It is
386 * generally useful for non-blocking network IO related errnos.
387 * -- adrian
388 */
389 int
390 ignoreErrno(int ierrno)
391 {
392 switch (ierrno)
393 {
394 case EINPROGRESS:
395 case EWOULDBLOCK:
396 #if EAGAIN != EWOULDBLOCK
397 case EAGAIN:
398 #endif
399 case EALREADY:
400 case EINTR:
401 #ifdef ERESTART
402 case ERESTART:
403 #endif
404 return 1;
405 default:
406 return 0;
407 }
408 }
409
410 /*
411 * comm_settimeout() - set the socket timeout
412 *
413 * Set the timeout for the fd
414 */
415 void
416 comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
417 {
418 assert(fd->flags.open);
419
420 fd->timeout = CurrentTime + (timeout / 1000);
421 fd->timeout_handler = callback;
422 fd->timeout_data = cbdata;
423 }
424
425 /*
426 * comm_setflush() - set a flush function
427 *
428 * A flush function is simply a function called if found during
429 * comm_timeouts(). Its basically a second timeout, except in this case
430 * I'm too lazy to implement multiple timeout functions! :-)
431 * its kinda nice to have it separate, since this is designed for
432 * flush functions, and when comm_close() is implemented correctly
433 * with close functions, we _actually_ don't call comm_close() here ..
434 * -- originally Adrian's notes
435 * comm_close() is replaced with fd_close() in fdlist.c
436 */
437 void
438 comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
439 {
440 assert(fd->flags.open);
441
442 fd->flush_timeout = CurrentTime + (timeout / 1000);
443 fd->flush_handler = callback;
444 fd->flush_data = cbdata;
445 }
446
447 /*
448 * comm_checktimeouts() - check the socket timeouts
449 *
450 * All this routine does is call the given callback/cbdata, without closing
451 * down the file descriptor. When close handlers have been implemented,
452 * this will happen.
453 */
454 void
455 comm_checktimeouts(void *notused)
456 {
457 int i;
458 fde_t *F;
459 PF *hdl;
460 void *data;
461
462 for (i = 0; i < FD_HASH_SIZE; i++)
463 for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop)
464 {
465 assert(F->flags.open);
466 fd_next_in_loop = F->hnext;
467
468 /* check flush functions */
469 if (F->flush_handler && F->flush_timeout > 0 &&
470 F->flush_timeout < CurrentTime)
471 {
472 hdl = F->flush_handler;
473 data = F->flush_data;
474 comm_setflush(F, 0, NULL, NULL);
475 hdl(F, data);
476 }
477
478 /* check timeouts */
479 if (F->timeout_handler && F->timeout > 0 &&
480 F->timeout < CurrentTime)
481 {
482 /* Call timeout handler */
483 hdl = F->timeout_handler;
484 data = F->timeout_data;
485 comm_settimeout(F, 0, NULL, NULL);
486 hdl(F, data);
487 }
488 }
489 }
490
491 /*
492 * void comm_connect_tcp(int fd, const char *host, unsigned short port,
493 * struct sockaddr *clocal, int socklen,
494 * CNCB *callback, void *data, int aftype, int timeout)
495 * Input: An fd to connect with, a host and port to connect to,
496 * a local sockaddr to connect from + length(or NULL to use the
497 * default), a callback, the data to pass into the callback, the
498 * address family.
499 * Output: None.
500 * Side-effects: A non-blocking connection to the host is started, and
501 * if necessary, set up for selection. The callback given
502 * may be called now, or it may be called later.
503 */
504 void
505 comm_connect_tcp(fde_t *fd, const char *host, unsigned short port,
506 struct sockaddr *clocal, int socklen, CNCB *callback,
507 void *data, int aftype, int timeout)
508 {
509 struct addrinfo hints, *res;
510 char portname[PORTNAMELEN + 1];
511
512 assert(callback);
513 fd->connect.callback = callback;
514 fd->connect.data = data;
515
516 fd->connect.hostaddr.ss.ss_family = aftype;
517 fd->connect.hostaddr.ss_port = htons(port);
518
519 /* Note that we're using a passed sockaddr here. This is because
520 * generally you'll be bind()ing to a sockaddr grabbed from
521 * getsockname(), so this makes things easier.
522 * XXX If NULL is passed as local, we should later on bind() to the
523 * virtual host IP, for completeness.
524 * -- adrian
525 */
526 if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0))
527 {
528 /* Failure, call the callback with COMM_ERR_BIND */
529 comm_connect_callback(fd, COMM_ERR_BIND);
530 /* ... and quit */
531 return;
532 }
533
534 /* Next, if we have been given an IP, get the addr and skip the
535 * DNS check (and head direct to comm_connect_tryconnect().
536 */
537 memset(&hints, 0, sizeof(hints));
538 hints.ai_family = AF_UNSPEC;
539 hints.ai_socktype = SOCK_STREAM;
540 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
541
542 snprintf(portname, sizeof(portname), "%d", port);
543
544 if (irc_getaddrinfo(host, portname, &hints, &res))
545 {
546 /* Send the DNS request, for the next level */
547 if (aftype == AF_INET6)
548 gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA);
549 else
550 gethost_byname_type(comm_connect_dns_callback, fd, host, T_A);
551 }
552 else
553 {
554 /* We have a valid IP, so we just call tryconnect */
555 /* Make sure we actually set the timeout here .. */
556 assert(res != NULL);
557 memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen);
558 fd->connect.hostaddr.ss_len = res->ai_addrlen;
559 fd->connect.hostaddr.ss.ss_family = res->ai_family;
560 irc_freeaddrinfo(res);
561 comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL);
562 comm_connect_tryconnect(fd, NULL);
563 }
564 }
565
566 /*
567 * comm_connect_callback() - call the callback, and continue with life
568 */
569 static void
570 comm_connect_callback(fde_t *fd, int status)
571 {
572 CNCB *hdl;
573
574 /* This check is gross..but probably necessary */
575 if (fd->connect.callback == NULL)
576 return;
577
578 /* Clear the connect flag + handler */
579 hdl = fd->connect.callback;
580 fd->connect.callback = NULL;
581
582 /* Clear the timeout handler */
583 comm_settimeout(fd, 0, NULL, NULL);
584
585 /* Call the handler */
586 hdl(fd, status, fd->connect.data);
587 }
588
589 /*
590 * comm_connect_timeout() - this gets called when the socket connection
591 * times out. This *only* can be called once connect() is initially
592 * called ..
593 */
594 static void
595 comm_connect_timeout(fde_t *fd, void *notused)
596 {
597 /* error! */
598 comm_connect_callback(fd, COMM_ERR_TIMEOUT);
599 }
600
601 /*
602 * comm_connect_dns_callback() - called at the completion of the DNS request
603 *
604 * The DNS request has completed, so if we've got an error, return it,
605 * otherwise we initiate the connect()
606 */
607 static void
608 comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
609 {
610 fde_t *F = vptr;
611
612 if (name == NULL)
613 {
614 comm_connect_callback(F, COMM_ERR_DNS);
615 return;
616 }
617
618 /* No error, set a 10 second timeout */
619 comm_settimeout(F, 30*1000, comm_connect_timeout, NULL);
620
621 /* Copy over the DNS reply info so we can use it in the connect() */
622 /*
623 * Note we don't fudge the refcount here, because we aren't keeping
624 * the DNS record around, and the DNS cache is gone anyway..
625 * -- adrian
626 */
627 memcpy(&F->connect.hostaddr, addr, addr->ss_len);
628 /* The cast is hacky, but safe - port offset is same on v4 and v6 */
629 ((struct sockaddr_in *) &F->connect.hostaddr)->sin_port =
630 F->connect.hostaddr.ss_port;
631 F->connect.hostaddr.ss_len = addr->ss_len;
632
633 /* Now, call the tryconnect() routine to try a connect() */
634 comm_connect_tryconnect(F, NULL);
635 }
636
637 /* static void comm_connect_tryconnect(int fd, void *notused)
638 * Input: The fd, the handler data(unused).
639 * Output: None.
640 * Side-effects: Try and connect with pending connect data for the FD. If
641 * we succeed or get a fatal error, call the callback.
642 * Otherwise, it is still blocking or something, so register
643 * to select for a write event on this FD.
644 */
645 static void
646 comm_connect_tryconnect(fde_t *fd, void *notused)
647 {
648 int retval;
649
650 /* This check is needed or re-entrant s_bsd_* like sigio break it. */
651 if (fd->connect.callback == NULL)
652 return;
653
654 /* Try the connect() */
655 retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr,
656 fd->connect.hostaddr.ss_len);
657
658 /* Error? */
659 if (retval < 0)
660 {
661 #ifdef _WIN32
662 errno = WSAGetLastError();
663 #endif
664 /*
665 * If we get EISCONN, then we've already connect()ed the socket,
666 * which is a good thing.
667 * -- adrian
668 */
669 if (errno == EISCONN)
670 comm_connect_callback(fd, COMM_OK);
671 else if (ignoreErrno(errno))
672 /* Ignore error? Reschedule */
673 comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect,
674 NULL, 0);
675 else
676 /* Error? Fail with COMM_ERR_CONNECT */
677 comm_connect_callback(fd, COMM_ERR_CONNECT);
678 return;
679 }
680
681 /* If we get here, we've suceeded, so call with COMM_OK */
682 comm_connect_callback(fd, COMM_OK);
683 }
684
685 /*
686 * comm_errorstr() - return an error string for the given error condition
687 */
688 const char *
689 comm_errstr(int error)
690 {
691 if (error < 0 || error >= COMM_ERR_MAX)
692 return "Invalid error number!";
693 return comm_err_str[error];
694 }
695
696 /*
697 * comm_open() - open a socket
698 *
699 * This is a highly highly cut down version of squid's comm_open() which
700 * for the most part emulates socket(), *EXCEPT* it fails if we're about
701 * to run out of file descriptors.
702 */
703 int
704 comm_open(fde_t *F, int family, int sock_type, int proto, const char *note)
705 {
706 int fd;
707
708 /* First, make sure we aren't going to run out of file descriptors */
709 if (number_fd >= hard_fdlimit)
710 {
711 errno = ENFILE;
712 return -1;
713 }
714
715 /*
716 * Next, we try to open the socket. We *should* drop the reserved FD
717 * limit if/when we get an error, but we can deal with that later.
718 * XXX !!! -- adrian
719 */
720 fd = socket(family, sock_type, proto);
721 if (fd < 0)
722 {
723 #ifdef _WIN32
724 errno = WSAGetLastError();
725 #endif
726 return -1; /* errno will be passed through, yay.. */
727 }
728
729 execute_callback(setup_socket_cb, fd);
730
731 /* update things in our fd tracking */
732 fd_open(F, fd, 1, note);
733 return 0;
734 }
735
736 /*
737 * comm_accept() - accept an incoming connection
738 *
739 * This is a simple wrapper for accept() which enforces FD limits like
740 * comm_open() does. Returned fd must be either closed or tagged with
741 * fd_open (this function no longer does it).
742 */
743 int
744 comm_accept(struct Listener *lptr, struct irc_ssaddr *pn)
745 {
746 int newfd;
747 socklen_t addrlen = sizeof(struct irc_ssaddr);
748
749 if (number_fd >= hard_fdlimit)
750 {
751 errno = ENFILE;
752 return -1;
753 }
754
755 /*
756 * Next, do the accept(). if we get an error, we should drop the
757 * reserved fd limit, but we can deal with that when comm_open()
758 * also does it. XXX -- adrian
759 */
760 newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, (socklen_t *)&addrlen);
761 if (newfd < 0)
762 {
763 #ifdef _WIN32
764 errno = WSAGetLastError();
765 #endif
766 return -1;
767 }
768
769 #ifdef IPV6
770 remove_ipv6_mapping(pn);
771 #else
772 pn->ss_len = addrlen;
773 #endif
774
775 execute_callback(setup_socket_cb, newfd);
776
777 /* .. and return */
778 return newfd;
779 }
780
781 /*
782 * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
783 * This function should really inspect the struct itself rather than relying
784 * on inet_pton and inet_ntop. OSes with IPv6 mapping listening on both
785 * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
786 *
787 */
788 #ifdef IPV6
789 void
790 remove_ipv6_mapping(struct irc_ssaddr *addr)
791 {
792 if (addr->ss.ss_family == AF_INET6)
793 {
794 struct sockaddr_in6 *v6;
795
796 v6 = (struct sockaddr_in6*)addr;
797 if (IN6_IS_ADDR_V4MAPPED(&v6->sin6_addr))
798 {
799 char v4ip[HOSTIPLEN];
800 struct sockaddr_in *v4 = (struct sockaddr_in*)addr;
801 inetntop(AF_INET6, &v6->sin6_addr, v4ip, HOSTIPLEN);
802 inet_pton(AF_INET, v4ip, &v4->sin_addr);
803 addr->ss.ss_family = AF_INET;
804 addr->ss_len = sizeof(struct sockaddr_in);
805 }
806 else
807 addr->ss_len = sizeof(struct sockaddr_in6);
808 }
809 else
810 addr->ss_len = sizeof(struct sockaddr_in);
811 }
812 #endif

Properties

Name Value
svn:eol-style native
svn:keywords Id Revision