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root/svn/ircd-hybrid/trunk/src/s_bsd.c
Revision: 2235
Committed: Sat Jun 15 18:14:12 2013 UTC (12 years, 2 months ago) by michael
Content type: text/x-csrc
File size: 22138 byte(s)
Log Message:
- Change CERTFP implementation to use SHA-256 hashes
- Remove base16_encode()

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 #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 "dbuf.h"
34 #include "event.h"
35 #include "irc_string.h"
36 #include "ircd.h"
37 #include "listener.h"
38 #include "numeric.h"
39 #include "packet.h"
40 #include "irc_res.h"
41 #include "restart.h"
42 #include "s_auth.h"
43 #include "conf.h"
44 #include "log.h"
45 #include "s_serv.h"
46 #include "send.h"
47 #include "memory.h"
48 #include "s_user.h"
49 #include "hook.h"
50
51 static const char *comm_err_str[] = { "Comm OK", "Error during bind()",
52 "Error during DNS lookup", "connect timeout", "Error during connect()",
53 "Comm Error" };
54
55 struct Callback *setup_socket_cb = NULL;
56
57 static void comm_connect_callback(fde_t *, int);
58 static PF comm_connect_timeout;
59 static void comm_connect_dns_callback(void *, const struct irc_ssaddr *, const char *);
60 static PF comm_connect_tryconnect;
61
62
63 /* check_can_use_v6()
64 * Check if the system can open AF_INET6 sockets
65 */
66 void
67 check_can_use_v6(void)
68 {
69 #ifdef IPV6
70 int v6;
71
72 if ((v6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0)
73 ServerInfo.can_use_v6 = 0;
74 else
75 {
76 ServerInfo.can_use_v6 = 1;
77 close(v6);
78 }
79 #else
80 ServerInfo.can_use_v6 = 0;
81 #endif
82 }
83
84 /* get_sockerr - get the error value from the socket or the current errno
85 *
86 * Get the *real* error from the socket (well try to anyway..).
87 * This may only work when SO_DEBUG is enabled but its worth the
88 * gamble anyway.
89 */
90 int
91 get_sockerr(int fd)
92 {
93 int errtmp = errno;
94 #ifdef SO_ERROR
95 int err = 0;
96 socklen_t len = sizeof(err);
97
98 if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len))
99 {
100 if (err)
101 errtmp = err;
102 }
103 errno = errtmp;
104 #endif
105 return errtmp;
106 }
107
108 /*
109 * report_error - report an error from an errno.
110 * Record error to log and also send a copy to all *LOCAL* opers online.
111 *
112 * text is a *format* string for outputing error. It must
113 * contain only two '%s', the first will be replaced
114 * by the sockhost from the client_p, and the latter will
115 * be taken from sys_errlist[errno].
116 *
117 * client_p if not NULL, is the *LOCAL* client associated with
118 * the error.
119 *
120 * Cannot use perror() within daemon. stderr is closed in
121 * ircd and cannot be used. And, worse yet, it might have
122 * been reassigned to a normal connection...
123 *
124 * Actually stderr is still there IFF ircd was run with -s --Rodder
125 */
126
127 void
128 report_error(int level, const char* text, const char* who, int error)
129 {
130 who = (who) ? who : "";
131
132 sendto_realops_flags(UMODE_DEBUG, level, SEND_NOTICE,
133 text, who, strerror(error));
134 ilog(LOG_TYPE_IRCD, text, who, strerror(error));
135 }
136
137 /*
138 * setup_socket()
139 *
140 * Set the socket non-blocking, and other wonderful bits.
141 */
142 static void *
143 setup_socket(va_list args)
144 {
145 int fd = va_arg(args, int);
146 int opt = 1;
147
148 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
149
150 #ifdef IPTOS_LOWDELAY
151 opt = IPTOS_LOWDELAY;
152 setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
153 #endif
154
155 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
156
157 return NULL;
158 }
159
160 /*
161 * init_comm()
162 *
163 * Initializes comm subsystem.
164 */
165 void
166 init_comm(void)
167 {
168 setup_socket_cb = register_callback("setup_socket", setup_socket);
169 init_netio();
170 }
171
172 /*
173 * close_connection
174 * Close the physical connection. This function must make
175 * MyConnect(client_p) == FALSE, and set client_p->from == NULL.
176 */
177 void
178 close_connection(struct Client *client_p)
179 {
180 dlink_node *ptr = NULL;
181
182 assert(client_p);
183
184 if (!IsDead(client_p))
185 {
186 /* attempt to flush any pending dbufs. Evil, but .. -- adrian */
187 /* there is still a chance that we might send data to this socket
188 * even if it is marked as blocked (COMM_SELECT_READ handler is called
189 * before COMM_SELECT_WRITE). Let's try, nothing to lose.. -adx
190 */
191 ClearSendqBlocked(client_p);
192 send_queued_write(client_p);
193 }
194
195 if (IsClient(client_p))
196 {
197 ++ServerStats.is_cl;
198 ServerStats.is_cbs += client_p->localClient->send.bytes;
199 ServerStats.is_cbr += client_p->localClient->recv.bytes;
200 ServerStats.is_cti += CurrentTime - client_p->localClient->firsttime;
201 }
202 else if (IsServer(client_p))
203 {
204 ++ServerStats.is_sv;
205 ServerStats.is_sbs += client_p->localClient->send.bytes;
206 ServerStats.is_sbr += client_p->localClient->recv.bytes;
207 ServerStats.is_sti += CurrentTime - client_p->localClient->firsttime;
208
209 DLINK_FOREACH(ptr, server_items.head)
210 {
211 struct MaskItem *conf = ptr->data;
212
213 if (irccmp(conf->name, client_p->name))
214 continue;
215
216 /*
217 * Reset next-connect cycle of all connect{} blocks that match
218 * this servername.
219 */
220 conf->until = CurrentTime + conf->class->con_freq;
221 }
222 }
223 else
224 ++ServerStats.is_ni;
225
226 #ifdef HAVE_LIBCRYPTO
227 if (client_p->localClient->fd.ssl)
228 {
229 SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN);
230
231 if (!SSL_shutdown(client_p->localClient->fd.ssl))
232 SSL_shutdown(client_p->localClient->fd.ssl);
233 }
234 #endif
235 if (client_p->localClient->fd.flags.open)
236 fd_close(&client_p->localClient->fd);
237
238 dbuf_clear(&client_p->localClient->buf_sendq);
239 dbuf_clear(&client_p->localClient->buf_recvq);
240
241 MyFree(client_p->localClient->passwd);
242 detach_conf(client_p, CONF_CLIENT|CONF_OPER|CONF_SERVER);
243 client_p->from = NULL; /* ...this should catch them! >:) --msa */
244 }
245
246 #ifdef HAVE_LIBCRYPTO
247 /*
248 * ssl_handshake - let OpenSSL initialize the protocol. Register for
249 * read/write events if necessary.
250 */
251 static void
252 ssl_handshake(int fd, struct Client *client_p)
253 {
254 X509 *cert = NULL;
255 int ret = SSL_accept(client_p->localClient->fd.ssl);
256 int err = SSL_get_error(client_p->localClient->fd.ssl, ret);
257
258 ilog(LOG_TYPE_IRCD, "SSL Error %d %s", err, ERR_error_string(err, NULL));
259
260 if ((cert = SSL_get_peer_certificate(client_p->localClient->fd.ssl)))
261 {
262 int res = SSL_get_verify_result(client_p->localClient->fd.ssl);
263 char buf[EVP_MAX_MD_SIZE * 2 + 1] = { '\0' };
264 unsigned char md[EVP_MAX_MD_SIZE * 2 + 1] = { '\0' };
265
266 if (res == X509_V_OK || res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
267 res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
268 res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
269 {
270 unsigned int i = 0, n = 0;
271
272 if (X509_digest(cert, EVP_sha256(), md, &n))
273 {
274 for (; i < n; ++i)
275 snprintf(buf + 2 * i, 3, "%02X", md[i]);
276 client_p->certfp = xstrdup(buf);
277 }
278 }
279 else
280 ilog(LOG_TYPE_IRCD, "Client %s!%s@%s gave bad SSL client certificate: %d",
281 client_p->name, client_p->username, client_p->host, res);
282 X509_free(cert);
283 }
284
285 if (ret <= 0)
286 {
287 switch (SSL_get_error(client_p->localClient->fd.ssl, ret))
288 {
289 case SSL_ERROR_WANT_WRITE:
290 comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE,
291 (PF *) ssl_handshake, client_p, 0);
292 return;
293
294 case SSL_ERROR_WANT_READ:
295 comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ,
296 (PF *) ssl_handshake, client_p, 0);
297 return;
298
299 default:
300 exit_client(client_p, client_p, "Error during SSL handshake");
301 return;
302 }
303 }
304
305 start_auth(client_p);
306 }
307 #endif
308
309 /*
310 * add_connection - creates a client which has just connected to us on
311 * the given fd. The sockhost field is initialized with the ip# of the host.
312 * An unique id is calculated now, in case it is needed for auth.
313 * The client is sent to the auth module for verification, and not put in
314 * any client list yet.
315 */
316 void
317 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
318 {
319 struct Client *new_client = make_client(NULL);
320
321 fd_open(&new_client->localClient->fd, fd, 1,
322 (listener->flags & LISTENER_SSL) ?
323 "Incoming SSL connection" : "Incoming connection");
324
325 /*
326 * copy address to 'sockhost' as a string, copy it to host too
327 * so we have something valid to put into error messages...
328 */
329 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
330
331 getnameinfo((struct sockaddr *)&new_client->localClient->ip,
332 new_client->localClient->ip.ss_len, new_client->sockhost,
333 sizeof(new_client->sockhost), NULL, 0, NI_NUMERICHOST);
334 new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
335
336 #ifdef HAVE_LIBGEOIP
337 /* XXX IPV6 SUPPORT XXX */
338 if (irn->ss.ss_family == AF_INET && geoip_ctx)
339 {
340 const struct sockaddr_in *v4 = (const struct sockaddr_in *)&new_client->localClient->ip;
341 new_client->localClient->country_id = GeoIP_id_by_ipnum(geoip_ctx, (unsigned long)ntohl(v4->sin_addr.s_addr));
342 }
343 #endif
344
345 if (new_client->sockhost[0] == ':' && new_client->sockhost[1] == ':')
346 {
347 strlcpy(new_client->host, "0", sizeof(new_client->host));
348 strlcpy(new_client->host+1, new_client->sockhost, sizeof(new_client->host)-1);
349 memmove(new_client->sockhost+1, new_client->sockhost, sizeof(new_client->sockhost)-1);
350 new_client->sockhost[0] = '0';
351 }
352 else
353 strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
354
355 new_client->localClient->listener = listener;
356 ++listener->ref_count;
357
358 #ifdef HAVE_LIBCRYPTO
359 if (listener->flags & LISTENER_SSL)
360 {
361 if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL)
362 {
363 ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
364 ERR_error_string(ERR_get_error(), NULL));
365
366 SetDead(new_client);
367 exit_client(new_client, new_client, "SSL_new failed");
368 return;
369 }
370
371 SSL_set_fd(new_client->localClient->fd.ssl, fd);
372 ssl_handshake(0, new_client);
373 }
374 else
375 #endif
376 start_auth(new_client);
377 }
378
379 /*
380 * stolen from squid - its a neat (but overused! :) routine which we
381 * can use to see whether we can ignore this errno or not. It is
382 * generally useful for non-blocking network IO related errnos.
383 * -- adrian
384 */
385 int
386 ignoreErrno(int ierrno)
387 {
388 switch (ierrno)
389 {
390 case EINPROGRESS:
391 case EWOULDBLOCK:
392 #if EAGAIN != EWOULDBLOCK
393 case EAGAIN:
394 #endif
395 case EALREADY:
396 case EINTR:
397 #ifdef ERESTART
398 case ERESTART:
399 #endif
400 return 1;
401 default:
402 return 0;
403 }
404 }
405
406 /*
407 * comm_settimeout() - set the socket timeout
408 *
409 * Set the timeout for the fd
410 */
411 void
412 comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
413 {
414 assert(fd->flags.open);
415
416 fd->timeout = CurrentTime + (timeout / 1000);
417 fd->timeout_handler = callback;
418 fd->timeout_data = cbdata;
419 }
420
421 /*
422 * comm_setflush() - set a flush function
423 *
424 * A flush function is simply a function called if found during
425 * comm_timeouts(). Its basically a second timeout, except in this case
426 * I'm too lazy to implement multiple timeout functions! :-)
427 * its kinda nice to have it separate, since this is designed for
428 * flush functions, and when comm_close() is implemented correctly
429 * with close functions, we _actually_ don't call comm_close() here ..
430 * -- originally Adrian's notes
431 * comm_close() is replaced with fd_close() in fdlist.c
432 */
433 void
434 comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
435 {
436 assert(fd->flags.open);
437
438 fd->flush_timeout = CurrentTime + (timeout / 1000);
439 fd->flush_handler = callback;
440 fd->flush_data = cbdata;
441 }
442
443 /*
444 * comm_checktimeouts() - check the socket timeouts
445 *
446 * All this routine does is call the given callback/cbdata, without closing
447 * down the file descriptor. When close handlers have been implemented,
448 * this will happen.
449 */
450 void
451 comm_checktimeouts(void *notused)
452 {
453 int i;
454 fde_t *F;
455 PF *hdl;
456 void *data;
457
458 for (i = 0; i < FD_HASH_SIZE; i++)
459 for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop)
460 {
461 assert(F->flags.open);
462 fd_next_in_loop = F->hnext;
463
464 /* check flush functions */
465 if (F->flush_handler && F->flush_timeout > 0 &&
466 F->flush_timeout < CurrentTime)
467 {
468 hdl = F->flush_handler;
469 data = F->flush_data;
470 comm_setflush(F, 0, NULL, NULL);
471 hdl(F, data);
472 }
473
474 /* check timeouts */
475 if (F->timeout_handler && F->timeout > 0 &&
476 F->timeout < CurrentTime)
477 {
478 /* Call timeout handler */
479 hdl = F->timeout_handler;
480 data = F->timeout_data;
481 comm_settimeout(F, 0, NULL, NULL);
482 hdl(F, data);
483 }
484 }
485 }
486
487 /*
488 * void comm_connect_tcp(int fd, const char *host, unsigned short port,
489 * struct sockaddr *clocal, int socklen,
490 * CNCB *callback, void *data, int aftype, int timeout)
491 * Input: An fd to connect with, a host and port to connect to,
492 * a local sockaddr to connect from + length(or NULL to use the
493 * default), a callback, the data to pass into the callback, the
494 * address family.
495 * Output: None.
496 * Side-effects: A non-blocking connection to the host is started, and
497 * if necessary, set up for selection. The callback given
498 * may be called now, or it may be called later.
499 */
500 void
501 comm_connect_tcp(fde_t *fd, const char *host, unsigned short port,
502 struct sockaddr *clocal, int socklen, CNCB *callback,
503 void *data, int aftype, int timeout)
504 {
505 struct addrinfo hints, *res;
506 char portname[PORTNAMELEN + 1];
507
508 assert(callback);
509 fd->connect.callback = callback;
510 fd->connect.data = data;
511
512 fd->connect.hostaddr.ss.ss_family = aftype;
513 fd->connect.hostaddr.ss_port = htons(port);
514
515 /* Note that we're using a passed sockaddr here. This is because
516 * generally you'll be bind()ing to a sockaddr grabbed from
517 * getsockname(), so this makes things easier.
518 * XXX If NULL is passed as local, we should later on bind() to the
519 * virtual host IP, for completeness.
520 * -- adrian
521 */
522 if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0))
523 {
524 /* Failure, call the callback with COMM_ERR_BIND */
525 comm_connect_callback(fd, COMM_ERR_BIND);
526 /* ... and quit */
527 return;
528 }
529
530 /* Next, if we have been given an IP, get the addr and skip the
531 * DNS check (and head direct to comm_connect_tryconnect().
532 */
533 memset(&hints, 0, sizeof(hints));
534 hints.ai_family = AF_UNSPEC;
535 hints.ai_socktype = SOCK_STREAM;
536 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
537
538 snprintf(portname, sizeof(portname), "%d", port);
539
540 if (getaddrinfo(host, portname, &hints, &res))
541 {
542 /* Send the DNS request, for the next level */
543 if (aftype == AF_INET6)
544 gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA);
545 else
546 gethost_byname_type(comm_connect_dns_callback, fd, host, T_A);
547 }
548 else
549 {
550 /* We have a valid IP, so we just call tryconnect */
551 /* Make sure we actually set the timeout here .. */
552 assert(res != NULL);
553 memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen);
554 fd->connect.hostaddr.ss_len = res->ai_addrlen;
555 fd->connect.hostaddr.ss.ss_family = res->ai_family;
556 freeaddrinfo(res);
557 comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL);
558 comm_connect_tryconnect(fd, NULL);
559 }
560 }
561
562 /*
563 * comm_connect_callback() - call the callback, and continue with life
564 */
565 static void
566 comm_connect_callback(fde_t *fd, int status)
567 {
568 CNCB *hdl;
569
570 /* This check is gross..but probably necessary */
571 if (fd->connect.callback == NULL)
572 return;
573
574 /* Clear the connect flag + handler */
575 hdl = fd->connect.callback;
576 fd->connect.callback = NULL;
577
578 /* Clear the timeout handler */
579 comm_settimeout(fd, 0, NULL, NULL);
580
581 /* Call the handler */
582 hdl(fd, status, fd->connect.data);
583 }
584
585 /*
586 * comm_connect_timeout() - this gets called when the socket connection
587 * times out. This *only* can be called once connect() is initially
588 * called ..
589 */
590 static void
591 comm_connect_timeout(fde_t *fd, void *notused)
592 {
593 /* error! */
594 comm_connect_callback(fd, COMM_ERR_TIMEOUT);
595 }
596
597 /*
598 * comm_connect_dns_callback() - called at the completion of the DNS request
599 *
600 * The DNS request has completed, so if we've got an error, return it,
601 * otherwise we initiate the connect()
602 */
603 static void
604 comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
605 {
606 fde_t *F = vptr;
607
608 if (name == NULL)
609 {
610 comm_connect_callback(F, COMM_ERR_DNS);
611 return;
612 }
613
614 /* No error, set a 10 second timeout */
615 comm_settimeout(F, 30*1000, comm_connect_timeout, NULL);
616
617 /* Copy over the DNS reply info so we can use it in the connect() */
618 /*
619 * Note we don't fudge the refcount here, because we aren't keeping
620 * the DNS record around, and the DNS cache is gone anyway..
621 * -- adrian
622 */
623 memcpy(&F->connect.hostaddr, addr, addr->ss_len);
624 /* The cast is hacky, but safe - port offset is same on v4 and v6 */
625 ((struct sockaddr_in *) &F->connect.hostaddr)->sin_port =
626 F->connect.hostaddr.ss_port;
627 F->connect.hostaddr.ss_len = addr->ss_len;
628
629 /* Now, call the tryconnect() routine to try a connect() */
630 comm_connect_tryconnect(F, NULL);
631 }
632
633 /* static void comm_connect_tryconnect(int fd, void *notused)
634 * Input: The fd, the handler data(unused).
635 * Output: None.
636 * Side-effects: Try and connect with pending connect data for the FD. If
637 * we succeed or get a fatal error, call the callback.
638 * Otherwise, it is still blocking or something, so register
639 * to select for a write event on this FD.
640 */
641 static void
642 comm_connect_tryconnect(fde_t *fd, void *notused)
643 {
644 int retval;
645
646 /* This check is needed or re-entrant s_bsd_* like sigio break it. */
647 if (fd->connect.callback == NULL)
648 return;
649
650 /* Try the connect() */
651 retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr,
652 fd->connect.hostaddr.ss_len);
653
654 /* Error? */
655 if (retval < 0)
656 {
657 /*
658 * If we get EISCONN, then we've already connect()ed the socket,
659 * which is a good thing.
660 * -- adrian
661 */
662 if (errno == EISCONN)
663 comm_connect_callback(fd, COMM_OK);
664 else if (ignoreErrno(errno))
665 /* Ignore error? Reschedule */
666 comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect,
667 NULL, 0);
668 else
669 /* Error? Fail with COMM_ERR_CONNECT */
670 comm_connect_callback(fd, COMM_ERR_CONNECT);
671 return;
672 }
673
674 /* If we get here, we've suceeded, so call with COMM_OK */
675 comm_connect_callback(fd, COMM_OK);
676 }
677
678 /*
679 * comm_errorstr() - return an error string for the given error condition
680 */
681 const char *
682 comm_errstr(int error)
683 {
684 if (error < 0 || error >= COMM_ERR_MAX)
685 return "Invalid error number!";
686 return comm_err_str[error];
687 }
688
689 /*
690 * comm_open() - open a socket
691 *
692 * This is a highly highly cut down version of squid's comm_open() which
693 * for the most part emulates socket(), *EXCEPT* it fails if we're about
694 * to run out of file descriptors.
695 */
696 int
697 comm_open(fde_t *F, int family, int sock_type, int proto, const char *note)
698 {
699 int fd;
700
701 /* First, make sure we aren't going to run out of file descriptors */
702 if (number_fd >= hard_fdlimit)
703 {
704 errno = ENFILE;
705 return -1;
706 }
707
708 /*
709 * Next, we try to open the socket. We *should* drop the reserved FD
710 * limit if/when we get an error, but we can deal with that later.
711 * XXX !!! -- adrian
712 */
713 fd = socket(family, sock_type, proto);
714 if (fd < 0)
715 return -1; /* errno will be passed through, yay.. */
716
717 execute_callback(setup_socket_cb, fd);
718
719 /* update things in our fd tracking */
720 fd_open(F, fd, 1, note);
721 return 0;
722 }
723
724 /*
725 * comm_accept() - accept an incoming connection
726 *
727 * This is a simple wrapper for accept() which enforces FD limits like
728 * comm_open() does. Returned fd must be either closed or tagged with
729 * fd_open (this function no longer does it).
730 */
731 int
732 comm_accept(struct Listener *lptr, struct irc_ssaddr *pn)
733 {
734 int newfd;
735 socklen_t addrlen = sizeof(struct irc_ssaddr);
736
737 if (number_fd >= hard_fdlimit)
738 {
739 errno = ENFILE;
740 return -1;
741 }
742
743 /*
744 * Next, do the accept(). if we get an error, we should drop the
745 * reserved fd limit, but we can deal with that when comm_open()
746 * also does it. XXX -- adrian
747 */
748 newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, &addrlen);
749 if (newfd < 0)
750 return -1;
751
752 #ifdef IPV6
753 remove_ipv6_mapping(pn);
754 #else
755 pn->ss_len = addrlen;
756 #endif
757
758 execute_callback(setup_socket_cb, newfd);
759
760 /* .. and return */
761 return newfd;
762 }
763
764 /*
765 * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
766 * OSes with IPv6 mapping listening on both
767 * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
768 *
769 */
770 #ifdef IPV6
771 void
772 remove_ipv6_mapping(struct irc_ssaddr *addr)
773 {
774 if (addr->ss.ss_family == AF_INET6)
775 {
776 if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
777 {
778 struct sockaddr_in6 v6;
779 struct sockaddr_in *v4 = (struct sockaddr_in *)addr;
780
781 memcpy(&v6, addr, sizeof(v6));
782 memset(v4, 0, sizeof(struct sockaddr_in));
783 memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));
784
785 addr->ss.ss_family = AF_INET;
786 addr->ss_len = sizeof(struct sockaddr_in);
787 }
788 else
789 addr->ss_len = sizeof(struct sockaddr_in6);
790 }
791 else
792 addr->ss_len = sizeof(struct sockaddr_in);
793 }
794 #endif

Properties

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