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root/svn/branches/newio/src/s_bsd.c
Revision: 2229
Committed: Thu Jun 13 20:10:27 2013 UTC (10 years, 9 months ago) by michael
Content type: text/x-csrc
Original Path: ircd-hybrid/trunk/src/s_bsd.c
File size: 24040 byte(s)
Log Message:
- Cleanups and fixes to previous commit -r2228

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 /* Base16 encoding is:
247 * Copyright (c) 2001-2004, Roger Dingledine
248 * Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson
249 *
250 * Redistribution and use in source and binary forms, with or without
251 * modification, are permitted provided that the following conditions are
252 * met:
253 *
254 * Redistributions of source code must retain the above copyright
255 * notice, this list of conditions and the following disclaimer.
256
257 * Redistributions in binary form must reproduce the above copyright notice,
258 * this list of conditions and the following disclaimer
259 * in the documentation and/or other materials provided with the distribution.
260 *
261 * Neither the names of the copyright owners nor the names of its
262 * contributors may be used to endorse or promote products derived from
263 * this software without specific prior written permission.
264
265 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
266 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
267 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
268 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
269 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
270 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
271 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
272 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
273 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
274 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
275 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
276 */
277 static void
278 base16_encode(char *dest, size_t destlen, const char *src, size_t srclen)
279 {
280 const char *end;
281 char *cp;
282
283 assert(destlen >= srclen * 2 + 1);
284
285 cp = dest;
286 end = src + srclen;
287
288 while (src < end)
289 {
290 *cp++ = "0123456789ABCDEF"[(*(const uint8_t *)src) >> 4];
291 *cp++ = "0123456789ABCDEF"[(*(const uint8_t *)src) & 0xf];
292 ++src;
293 }
294
295 *cp = '\0';
296 }
297
298 #ifdef HAVE_LIBCRYPTO
299 /*
300 * ssl_handshake - let OpenSSL initialize the protocol. Register for
301 * read/write events if necessary.
302 */
303 static void
304 ssl_handshake(int fd, struct Client *client_p)
305 {
306 X509 *cert = NULL;
307 int ret = SSL_accept(client_p->localClient->fd.ssl);
308 int err = SSL_get_error(client_p->localClient->fd.ssl, ret);
309
310 ilog(LOG_TYPE_IRCD, "SSL Error %d %s", err, ERR_error_string(err, NULL));
311
312 if ((cert = SSL_get_peer_certificate(client_p->localClient->fd.ssl)))
313 {
314 int res = SSL_get_verify_result(client_p->localClient->fd.ssl);
315 char buf[SHA_DIGEST_LENGTH * 2 + 1] = { '\0' };
316
317 if (res == X509_V_OK || res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
318 res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
319 res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
320 {
321 base16_encode(buf, sizeof(buf),
322 (const char *)cert->sha1_hash, sizeof(cert->sha1_hash));
323 client_p->certfp = xstrndup(buf, sizeof(buf));
324 }
325 else
326 ilog(LOG_TYPE_IRCD, "Client %s!%s@%s gave bad SSL client certificate: %d",
327 client_p->name, client_p->username, client_p->host, res);
328 X509_free(cert);
329 }
330
331 if (ret <= 0)
332 {
333 switch (SSL_get_error(client_p->localClient->fd.ssl, ret))
334 {
335 case SSL_ERROR_WANT_WRITE:
336 comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE,
337 (PF *) ssl_handshake, client_p, 0);
338 return;
339
340 case SSL_ERROR_WANT_READ:
341 comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ,
342 (PF *) ssl_handshake, client_p, 0);
343 return;
344
345 default:
346 exit_client(client_p, client_p, "Error during SSL handshake");
347 return;
348 }
349 }
350
351 start_auth(client_p);
352 }
353 #endif
354
355 /*
356 * add_connection - creates a client which has just connected to us on
357 * the given fd. The sockhost field is initialized with the ip# of the host.
358 * An unique id is calculated now, in case it is needed for auth.
359 * The client is sent to the auth module for verification, and not put in
360 * any client list yet.
361 */
362 void
363 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
364 {
365 struct Client *new_client = make_client(NULL);
366
367 fd_open(&new_client->localClient->fd, fd, 1,
368 (listener->flags & LISTENER_SSL) ?
369 "Incoming SSL connection" : "Incoming connection");
370
371 /*
372 * copy address to 'sockhost' as a string, copy it to host too
373 * so we have something valid to put into error messages...
374 */
375 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
376
377 getnameinfo((struct sockaddr *)&new_client->localClient->ip,
378 new_client->localClient->ip.ss_len, new_client->sockhost,
379 sizeof(new_client->sockhost), NULL, 0, NI_NUMERICHOST);
380 new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
381
382 #ifdef HAVE_LIBGEOIP
383 /* XXX IPV6 SUPPORT XXX */
384 if (irn->ss.ss_family == AF_INET && geoip_ctx)
385 {
386 const struct sockaddr_in *v4 = (const struct sockaddr_in *)&new_client->localClient->ip;
387 new_client->localClient->country_id = GeoIP_id_by_ipnum(geoip_ctx, (unsigned long)ntohl(v4->sin_addr.s_addr));
388 }
389 #endif
390
391 if (new_client->sockhost[0] == ':' && new_client->sockhost[1] == ':')
392 {
393 strlcpy(new_client->host, "0", sizeof(new_client->host));
394 strlcpy(new_client->host+1, new_client->sockhost, sizeof(new_client->host)-1);
395 memmove(new_client->sockhost+1, new_client->sockhost, sizeof(new_client->sockhost)-1);
396 new_client->sockhost[0] = '0';
397 }
398 else
399 strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
400
401 new_client->localClient->listener = listener;
402 ++listener->ref_count;
403
404 #ifdef HAVE_LIBCRYPTO
405 if (listener->flags & LISTENER_SSL)
406 {
407 if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL)
408 {
409 ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
410 ERR_error_string(ERR_get_error(), NULL));
411
412 SetDead(new_client);
413 exit_client(new_client, new_client, "SSL_new failed");
414 return;
415 }
416
417 SSL_set_fd(new_client->localClient->fd.ssl, fd);
418 ssl_handshake(0, new_client);
419 }
420 else
421 #endif
422 start_auth(new_client);
423 }
424
425 /*
426 * stolen from squid - its a neat (but overused! :) routine which we
427 * can use to see whether we can ignore this errno or not. It is
428 * generally useful for non-blocking network IO related errnos.
429 * -- adrian
430 */
431 int
432 ignoreErrno(int ierrno)
433 {
434 switch (ierrno)
435 {
436 case EINPROGRESS:
437 case EWOULDBLOCK:
438 #if EAGAIN != EWOULDBLOCK
439 case EAGAIN:
440 #endif
441 case EALREADY:
442 case EINTR:
443 #ifdef ERESTART
444 case ERESTART:
445 #endif
446 return 1;
447 default:
448 return 0;
449 }
450 }
451
452 /*
453 * comm_settimeout() - set the socket timeout
454 *
455 * Set the timeout for the fd
456 */
457 void
458 comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
459 {
460 assert(fd->flags.open);
461
462 fd->timeout = CurrentTime + (timeout / 1000);
463 fd->timeout_handler = callback;
464 fd->timeout_data = cbdata;
465 }
466
467 /*
468 * comm_setflush() - set a flush function
469 *
470 * A flush function is simply a function called if found during
471 * comm_timeouts(). Its basically a second timeout, except in this case
472 * I'm too lazy to implement multiple timeout functions! :-)
473 * its kinda nice to have it separate, since this is designed for
474 * flush functions, and when comm_close() is implemented correctly
475 * with close functions, we _actually_ don't call comm_close() here ..
476 * -- originally Adrian's notes
477 * comm_close() is replaced with fd_close() in fdlist.c
478 */
479 void
480 comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
481 {
482 assert(fd->flags.open);
483
484 fd->flush_timeout = CurrentTime + (timeout / 1000);
485 fd->flush_handler = callback;
486 fd->flush_data = cbdata;
487 }
488
489 /*
490 * comm_checktimeouts() - check the socket timeouts
491 *
492 * All this routine does is call the given callback/cbdata, without closing
493 * down the file descriptor. When close handlers have been implemented,
494 * this will happen.
495 */
496 void
497 comm_checktimeouts(void *notused)
498 {
499 int i;
500 fde_t *F;
501 PF *hdl;
502 void *data;
503
504 for (i = 0; i < FD_HASH_SIZE; i++)
505 for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop)
506 {
507 assert(F->flags.open);
508 fd_next_in_loop = F->hnext;
509
510 /* check flush functions */
511 if (F->flush_handler && F->flush_timeout > 0 &&
512 F->flush_timeout < CurrentTime)
513 {
514 hdl = F->flush_handler;
515 data = F->flush_data;
516 comm_setflush(F, 0, NULL, NULL);
517 hdl(F, data);
518 }
519
520 /* check timeouts */
521 if (F->timeout_handler && F->timeout > 0 &&
522 F->timeout < CurrentTime)
523 {
524 /* Call timeout handler */
525 hdl = F->timeout_handler;
526 data = F->timeout_data;
527 comm_settimeout(F, 0, NULL, NULL);
528 hdl(F, data);
529 }
530 }
531 }
532
533 /*
534 * void comm_connect_tcp(int fd, const char *host, unsigned short port,
535 * struct sockaddr *clocal, int socklen,
536 * CNCB *callback, void *data, int aftype, int timeout)
537 * Input: An fd to connect with, a host and port to connect to,
538 * a local sockaddr to connect from + length(or NULL to use the
539 * default), a callback, the data to pass into the callback, the
540 * address family.
541 * Output: None.
542 * Side-effects: A non-blocking connection to the host is started, and
543 * if necessary, set up for selection. The callback given
544 * may be called now, or it may be called later.
545 */
546 void
547 comm_connect_tcp(fde_t *fd, const char *host, unsigned short port,
548 struct sockaddr *clocal, int socklen, CNCB *callback,
549 void *data, int aftype, int timeout)
550 {
551 struct addrinfo hints, *res;
552 char portname[PORTNAMELEN + 1];
553
554 assert(callback);
555 fd->connect.callback = callback;
556 fd->connect.data = data;
557
558 fd->connect.hostaddr.ss.ss_family = aftype;
559 fd->connect.hostaddr.ss_port = htons(port);
560
561 /* Note that we're using a passed sockaddr here. This is because
562 * generally you'll be bind()ing to a sockaddr grabbed from
563 * getsockname(), so this makes things easier.
564 * XXX If NULL is passed as local, we should later on bind() to the
565 * virtual host IP, for completeness.
566 * -- adrian
567 */
568 if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0))
569 {
570 /* Failure, call the callback with COMM_ERR_BIND */
571 comm_connect_callback(fd, COMM_ERR_BIND);
572 /* ... and quit */
573 return;
574 }
575
576 /* Next, if we have been given an IP, get the addr and skip the
577 * DNS check (and head direct to comm_connect_tryconnect().
578 */
579 memset(&hints, 0, sizeof(hints));
580 hints.ai_family = AF_UNSPEC;
581 hints.ai_socktype = SOCK_STREAM;
582 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
583
584 snprintf(portname, sizeof(portname), "%d", port);
585
586 if (getaddrinfo(host, portname, &hints, &res))
587 {
588 /* Send the DNS request, for the next level */
589 if (aftype == AF_INET6)
590 gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA);
591 else
592 gethost_byname_type(comm_connect_dns_callback, fd, host, T_A);
593 }
594 else
595 {
596 /* We have a valid IP, so we just call tryconnect */
597 /* Make sure we actually set the timeout here .. */
598 assert(res != NULL);
599 memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen);
600 fd->connect.hostaddr.ss_len = res->ai_addrlen;
601 fd->connect.hostaddr.ss.ss_family = res->ai_family;
602 freeaddrinfo(res);
603 comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL);
604 comm_connect_tryconnect(fd, NULL);
605 }
606 }
607
608 /*
609 * comm_connect_callback() - call the callback, and continue with life
610 */
611 static void
612 comm_connect_callback(fde_t *fd, int status)
613 {
614 CNCB *hdl;
615
616 /* This check is gross..but probably necessary */
617 if (fd->connect.callback == NULL)
618 return;
619
620 /* Clear the connect flag + handler */
621 hdl = fd->connect.callback;
622 fd->connect.callback = NULL;
623
624 /* Clear the timeout handler */
625 comm_settimeout(fd, 0, NULL, NULL);
626
627 /* Call the handler */
628 hdl(fd, status, fd->connect.data);
629 }
630
631 /*
632 * comm_connect_timeout() - this gets called when the socket connection
633 * times out. This *only* can be called once connect() is initially
634 * called ..
635 */
636 static void
637 comm_connect_timeout(fde_t *fd, void *notused)
638 {
639 /* error! */
640 comm_connect_callback(fd, COMM_ERR_TIMEOUT);
641 }
642
643 /*
644 * comm_connect_dns_callback() - called at the completion of the DNS request
645 *
646 * The DNS request has completed, so if we've got an error, return it,
647 * otherwise we initiate the connect()
648 */
649 static void
650 comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
651 {
652 fde_t *F = vptr;
653
654 if (name == NULL)
655 {
656 comm_connect_callback(F, COMM_ERR_DNS);
657 return;
658 }
659
660 /* No error, set a 10 second timeout */
661 comm_settimeout(F, 30*1000, comm_connect_timeout, NULL);
662
663 /* Copy over the DNS reply info so we can use it in the connect() */
664 /*
665 * Note we don't fudge the refcount here, because we aren't keeping
666 * the DNS record around, and the DNS cache is gone anyway..
667 * -- adrian
668 */
669 memcpy(&F->connect.hostaddr, addr, addr->ss_len);
670 /* The cast is hacky, but safe - port offset is same on v4 and v6 */
671 ((struct sockaddr_in *) &F->connect.hostaddr)->sin_port =
672 F->connect.hostaddr.ss_port;
673 F->connect.hostaddr.ss_len = addr->ss_len;
674
675 /* Now, call the tryconnect() routine to try a connect() */
676 comm_connect_tryconnect(F, NULL);
677 }
678
679 /* static void comm_connect_tryconnect(int fd, void *notused)
680 * Input: The fd, the handler data(unused).
681 * Output: None.
682 * Side-effects: Try and connect with pending connect data for the FD. If
683 * we succeed or get a fatal error, call the callback.
684 * Otherwise, it is still blocking or something, so register
685 * to select for a write event on this FD.
686 */
687 static void
688 comm_connect_tryconnect(fde_t *fd, void *notused)
689 {
690 int retval;
691
692 /* This check is needed or re-entrant s_bsd_* like sigio break it. */
693 if (fd->connect.callback == NULL)
694 return;
695
696 /* Try the connect() */
697 retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr,
698 fd->connect.hostaddr.ss_len);
699
700 /* Error? */
701 if (retval < 0)
702 {
703 /*
704 * If we get EISCONN, then we've already connect()ed the socket,
705 * which is a good thing.
706 * -- adrian
707 */
708 if (errno == EISCONN)
709 comm_connect_callback(fd, COMM_OK);
710 else if (ignoreErrno(errno))
711 /* Ignore error? Reschedule */
712 comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect,
713 NULL, 0);
714 else
715 /* Error? Fail with COMM_ERR_CONNECT */
716 comm_connect_callback(fd, COMM_ERR_CONNECT);
717 return;
718 }
719
720 /* If we get here, we've suceeded, so call with COMM_OK */
721 comm_connect_callback(fd, COMM_OK);
722 }
723
724 /*
725 * comm_errorstr() - return an error string for the given error condition
726 */
727 const char *
728 comm_errstr(int error)
729 {
730 if (error < 0 || error >= COMM_ERR_MAX)
731 return "Invalid error number!";
732 return comm_err_str[error];
733 }
734
735 /*
736 * comm_open() - open a socket
737 *
738 * This is a highly highly cut down version of squid's comm_open() which
739 * for the most part emulates socket(), *EXCEPT* it fails if we're about
740 * to run out of file descriptors.
741 */
742 int
743 comm_open(fde_t *F, int family, int sock_type, int proto, const char *note)
744 {
745 int fd;
746
747 /* First, make sure we aren't going to run out of file descriptors */
748 if (number_fd >= hard_fdlimit)
749 {
750 errno = ENFILE;
751 return -1;
752 }
753
754 /*
755 * Next, we try to open the socket. We *should* drop the reserved FD
756 * limit if/when we get an error, but we can deal with that later.
757 * XXX !!! -- adrian
758 */
759 fd = socket(family, sock_type, proto);
760 if (fd < 0)
761 return -1; /* errno will be passed through, yay.. */
762
763 execute_callback(setup_socket_cb, fd);
764
765 /* update things in our fd tracking */
766 fd_open(F, fd, 1, note);
767 return 0;
768 }
769
770 /*
771 * comm_accept() - accept an incoming connection
772 *
773 * This is a simple wrapper for accept() which enforces FD limits like
774 * comm_open() does. Returned fd must be either closed or tagged with
775 * fd_open (this function no longer does it).
776 */
777 int
778 comm_accept(struct Listener *lptr, struct irc_ssaddr *pn)
779 {
780 int newfd;
781 socklen_t addrlen = sizeof(struct irc_ssaddr);
782
783 if (number_fd >= hard_fdlimit)
784 {
785 errno = ENFILE;
786 return -1;
787 }
788
789 /*
790 * Next, do the accept(). if we get an error, we should drop the
791 * reserved fd limit, but we can deal with that when comm_open()
792 * also does it. XXX -- adrian
793 */
794 newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, &addrlen);
795 if (newfd < 0)
796 return -1;
797
798 #ifdef IPV6
799 remove_ipv6_mapping(pn);
800 #else
801 pn->ss_len = addrlen;
802 #endif
803
804 execute_callback(setup_socket_cb, newfd);
805
806 /* .. and return */
807 return newfd;
808 }
809
810 /*
811 * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
812 * OSes with IPv6 mapping listening on both
813 * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
814 *
815 */
816 #ifdef IPV6
817 void
818 remove_ipv6_mapping(struct irc_ssaddr *addr)
819 {
820 if (addr->ss.ss_family == AF_INET6)
821 {
822 if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
823 {
824 struct sockaddr_in6 v6;
825 struct sockaddr_in *v4 = (struct sockaddr_in *)addr;
826
827 memcpy(&v6, addr, sizeof(v6));
828 memset(v4, 0, sizeof(struct sockaddr_in));
829 memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));
830
831 addr->ss.ss_family = AF_INET;
832 addr->ss_len = sizeof(struct sockaddr_in);
833 }
834 else
835 addr->ss_len = sizeof(struct sockaddr_in6);
836 }
837 else
838 addr->ss_len = sizeof(struct sockaddr_in);
839 }
840 #endif

Properties

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