/[svn]/ircd-hybrid-7.2/src/s_bsd.c
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Contents of /ircd-hybrid-7.2/src/s_bsd.c

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Revision 1013 - (show annotations)
Sun Oct 18 14:26:49 2009 UTC (11 years, 4 months ago) by michael
File MIME type: text/x-chdr
File size: 21826 byte(s)
- Add -Wextra -Wcast-align -Wbad-function-cast to CFLAGS if --enable-warnings is specified
- Fixed several compile warnings
- 64-bit cleanliness fixes, e.g., reorganize data structures to reduce storage/unnecessary padding

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

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svn:eol-style native
svn:keywords Id Revision

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