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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

# User Rev Content
1 adx 30 /*
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 knight 31 * $Id$
23 adx 30 */
24    
25     #include "stdinc.h"
26     #include <netinet/in_systm.h>
27     #include <netinet/ip.h>
28     #include <netinet/tcp.h>
29 michael 1011 #include "list.h"
30 adx 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 michael 1309 #include "conf.h"
44     #include "log.h"
45 adx 30 #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 michael 1013 static void comm_connect_callback(fde_t *, int);
58 adx 30 static PF comm_connect_timeout;
59 michael 992 static void comm_connect_dns_callback(void *, const struct irc_ssaddr *, const char *);
60 adx 30 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 michael 967 if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len))
99 adx 30 {
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 michael 1618 sendto_realops_flags(UMODE_DEBUG, level, SEND_NOTICE,
133     text, who, strerror(error));
134 michael 1247 ilog(LOG_TYPE_IRCD, text, who, strerror(error));
135 adx 30 }
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 michael 967 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
149 adx 30
150     #ifdef IPTOS_LOWDELAY
151     opt = IPTOS_LOWDELAY;
152 michael 967 setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
153 adx 30 #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 michael 1391 dlink_node *ptr = NULL;
181 adx 30
182 michael 1391 assert(client_p);
183 adx 30
184 michael 683 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 michael 1143 if (IsClient(client_p))
196 adx 30 {
197 michael 1143 ++ServerStats.is_cl;
198     ServerStats.is_cbs += client_p->localClient->send.bytes;
199     ServerStats.is_cbr += client_p->localClient->recv.bytes;
200 michael 1241 ServerStats.is_cti += CurrentTime - client_p->localClient->firsttime;
201 michael 1143 }
202     else if (IsServer(client_p))
203     {
204 michael 896 ++ServerStats.is_sv;
205     ServerStats.is_sbs += client_p->localClient->send.bytes;
206     ServerStats.is_sbr += client_p->localClient->recv.bytes;
207 michael 1241 ServerStats.is_sti += CurrentTime - client_p->localClient->firsttime;
208 adx 30
209 michael 1391 DLINK_FOREACH(ptr, server_items.head)
210 adx 30 {
211 michael 1632 struct MaskItem *conf = ptr->data;
212 michael 1391
213     if (irccmp(conf->name, client_p->name))
214     continue;
215    
216 adx 30 /*
217 michael 1391 * Reset next-connect cycle of all connect{} blocks that match
218     * this servername.
219 adx 30 */
220 michael 1649 conf->until = CurrentTime + conf->class->con_freq;
221 adx 30 }
222     }
223     else
224 michael 896 ++ServerStats.is_ni;
225 adx 30
226     #ifdef HAVE_LIBCRYPTO
227     if (client_p->localClient->fd.ssl)
228 michael 451 {
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 adx 30 #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 michael 1632 detach_conf(client_p, CONF_CLIENT|CONF_OPER|CONF_SERVER);
243 adx 30 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 michael 2228 X509 *cert = NULL;
255 adx 30 int ret = SSL_accept(client_p->localClient->fd.ssl);
256 michael 2228 int err = SSL_get_error(client_p->localClient->fd.ssl, ret);
257 adx 30
258 michael 2228 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 michael 2235 char buf[EVP_MAX_MD_SIZE * 2 + 1] = { '\0' };
264     unsigned char md[EVP_MAX_MD_SIZE * 2 + 1] = { '\0' };
265 michael 2228
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 michael 2229 {
270 michael 2235 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 michael 2229 }
279 michael 2228 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 adx 30 if (ret <= 0)
286 michael 2228 {
287 adx 30 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 michael 2228 }
304 adx 30
305 michael 2181 start_auth(client_p);
306 adx 30 }
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 michael 549 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
318 adx 30 {
319 michael 1123 struct Client *new_client = make_client(NULL);
320 michael 549
321 adx 30 fd_open(&new_client->localClient->fd, fd, 1,
322     (listener->flags & LISTENER_SSL) ?
323     "Incoming SSL connection" : "Incoming connection");
324    
325 michael 1123 /*
326 adx 30 * 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 michael 549 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
330 adx 30
331 michael 1123 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 adx 30 new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
335 michael 1072
336 michael 1858 #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 michael 1123 if (new_client->sockhost[0] == ':' && new_client->sockhost[1] == ':')
346 adx 30 {
347 michael 1072 strlcpy(new_client->host, "0", sizeof(new_client->host));
348     strlcpy(new_client->host+1, new_client->sockhost, sizeof(new_client->host)-1);
349 michael 1123 memmove(new_client->sockhost+1, new_client->sockhost, sizeof(new_client->sockhost)-1);
350     new_client->sockhost[0] = '0';
351 michael 549 }
352     else
353 michael 1072 strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
354 adx 30
355     new_client->localClient->listener = listener;
356     ++listener->ref_count;
357    
358     #ifdef HAVE_LIBCRYPTO
359 michael 549 if (listener->flags & LISTENER_SSL)
360 adx 30 {
361 michael 967 if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL)
362 adx 30 {
363 michael 1247 ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
364 adx 30 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 michael 2181 start_auth(new_client);
377 adx 30 }
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 michael 992 char portname[PORTNAMELEN + 1];
507 adx 30
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 michael 992 snprintf(portname, sizeof(portname), "%d", port);
539 adx 30
540 michael 1123 if (getaddrinfo(host, portname, &hints, &res))
541 adx 30 {
542     /* Send the DNS request, for the next level */
543 db 871 if (aftype == AF_INET6)
544 michael 992 gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA);
545 db 871 else
546 michael 992 gethost_byname_type(comm_connect_dns_callback, fd, host, T_A);
547 adx 30 }
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 michael 1123 freeaddrinfo(res);
557 adx 30 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 michael 992 comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
605 adx 30 {
606     fde_t *F = vptr;
607    
608 michael 992 if (name == NULL)
609 adx 30 {
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 michael 992 memcpy(&F->connect.hostaddr, addr, addr->ss_len);
624 adx 30 /* 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 michael 992 F->connect.hostaddr.ss_len = addr->ss_len;
628 adx 30
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 michael 1013 newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, &addrlen);
749 adx 30 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 michael 1122 * OSes with IPv6 mapping listening on both
767 adx 30 * 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 michael 1122 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 adx 30
781 michael 1122 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 adx 30 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

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svn:eol-style native
svn:keywords Id Revision