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

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Revision 1013 - (hide annotations)
Sun Oct 18 14:26:49 2009 UTC (10 years, 8 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 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 "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 michael 1013 static void comm_connect_callback(fde_t *, int);
62 adx 30 static PF comm_connect_timeout;
63 michael 992 static void comm_connect_dns_callback(void *, const struct irc_ssaddr *, const char *);
64 adx 30 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 michael 967 if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len))
103 adx 30 {
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 michael 967 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
153 adx 30
154     #ifdef IPTOS_LOWDELAY
155     opt = IPTOS_LOWDELAY;
156 michael 967 setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
157 adx 30 #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 michael 683 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 adx 30 if (IsServer(client_p))
202     {
203 michael 896 ++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 adx 30
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 michael 1013 if ((conf = find_conf_exact(SERVER_TYPE, client_p->name,
217     client_p->username, client_p->host)))
218 adx 30 {
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 michael 1013 aconf = map_to_conf(conf);
226     aclass = map_to_conf(aconf->class_ptr);
227 adx 30 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 michael 896 ++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 adx 30 }
239     else
240 michael 896 ++ServerStats.is_ni;
241 adx 30
242     #ifdef HAVE_LIBCRYPTO
243     if (client_p->localClient->fd.ssl)
244 michael 451 {
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 adx 30 #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 michael 549 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
309 adx 30 {
310     struct Client *new_client;
311 michael 549
312 adx 30 assert(NULL != listener);
313    
314 michael 549 new_client = make_client(NULL);
315 adx 30
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 michael 549 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
325 adx 30
326     irc_getnameinfo((struct sockaddr*)&new_client->localClient->ip,
327 michael 1013 new_client->localClient->ip.ss_len, new_client->sockhost,
328     sizeof(new_client->sockhost), NULL, 0, NI_NUMERICHOST);
329 adx 30 new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
330     #ifdef IPV6
331 michael 549 if (new_client->sockhost[0] == ':')
332 adx 30 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 michael 549 }
340     else
341 adx 30 #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 michael 549 if (listener->flags & LISTENER_SSL)
349 adx 30 {
350 michael 967 if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.server_ctx)) == NULL)
351 adx 30 {
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 michael 992 char portname[PORTNAMELEN + 1];
496 adx 30
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 michael 992 snprintf(portname, sizeof(portname), "%d", port);
528 adx 30
529     if (irc_getaddrinfo(host, portname, &hints, &res))
530     {
531     /* Send the DNS request, for the next level */
532 db 871 if (aftype == AF_INET6)
533 michael 992 gethost_byname_type(comm_connect_dns_callback, fd, host, T_AAAA);
534 db 871 else
535 michael 992 gethost_byname_type(comm_connect_dns_callback, fd, host, T_A);
536 adx 30 }
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 michael 992 comm_connect_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
594 adx 30 {
595     fde_t *F = vptr;
596    
597 michael 992 if (name == NULL)
598 adx 30 {
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 michael 992 memcpy(&F->connect.hostaddr, addr, addr->ss_len);
613 adx 30 /* 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 michael 992 F->connect.hostaddr.ss_len = addr->ss_len;
617 adx 30
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 michael 1013 newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, &addrlen);
738 adx 30 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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