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root/svn/branches/newio/src/s_bsd.c
Revision: 948
Committed: Tue Jul 21 17:34:06 2009 UTC (14 years, 8 months ago) by michael
Content type: text/x-csrc
Original Path: ircd-hybrid-7.2/src/s_bsd.c
File size: 22493 byte(s)
Log Message:
- lp64\llp64\ilp32 portability fixes

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     #ifndef _WIN32
27     #include <netinet/in_systm.h>
28     #include <netinet/ip.h>
29     #include <netinet/tcp.h>
30     #endif
31     #include "fdlist.h"
32     #include "s_bsd.h"
33     #include "client.h"
34     #include "common.h"
35     #include "dbuf.h"
36     #include "event.h"
37     #include "irc_string.h"
38     #include "irc_getnameinfo.h"
39     #include "irc_getaddrinfo.h"
40     #include "ircd.h"
41     #include "list.h"
42     #include "listener.h"
43     #include "numeric.h"
44     #include "packet.h"
45     #include "irc_res.h"
46     #include "inet_misc.h"
47     #include "restart.h"
48     #include "s_auth.h"
49     #include "s_conf.h"
50     #include "s_log.h"
51     #include "s_serv.h"
52     #include "send.h"
53     #include "memory.h"
54     #include "s_user.h"
55     #include "hook.h"
56    
57     static const char *comm_err_str[] = { "Comm OK", "Error during bind()",
58     "Error during DNS lookup", "connect timeout", "Error during connect()",
59     "Comm Error" };
60    
61     struct Callback *setup_socket_cb = NULL;
62    
63     static void comm_connect_callback(fde_t *fd, int status);
64     static PF comm_connect_timeout;
65     static void comm_connect_dns_callback(void *vptr, struct DNSReply *reply);
66     static PF comm_connect_tryconnect;
67    
68     extern void init_netio(void);
69    
70     /* check_can_use_v6()
71     * Check if the system can open AF_INET6 sockets
72     */
73     void
74     check_can_use_v6(void)
75     {
76     #ifdef IPV6
77     int v6;
78    
79     if ((v6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0)
80     ServerInfo.can_use_v6 = 0;
81     else
82     {
83     ServerInfo.can_use_v6 = 1;
84     #ifdef _WIN32
85     closesocket(v6);
86     #else
87     close(v6);
88     #endif
89     }
90     #else
91     ServerInfo.can_use_v6 = 0;
92     #endif
93     }
94    
95     /* get_sockerr - get the error value from the socket or the current errno
96     *
97     * Get the *real* error from the socket (well try to anyway..).
98     * This may only work when SO_DEBUG is enabled but its worth the
99     * gamble anyway.
100     */
101     int
102     get_sockerr(int fd)
103     {
104     #ifndef _WIN32
105     int errtmp = errno;
106     #else
107     int errtmp = WSAGetLastError();
108     #endif
109     #ifdef SO_ERROR
110     int err = 0;
111     socklen_t len = sizeof(err);
112    
113     if (-1 < fd && !getsockopt(fd, SOL_SOCKET, SO_ERROR, (char*) &err, (socklen_t *)&len))
114     {
115     if (err)
116     errtmp = err;
117     }
118     errno = errtmp;
119     #endif
120     return errtmp;
121     }
122    
123     /*
124     * report_error - report an error from an errno.
125     * Record error to log and also send a copy to all *LOCAL* opers online.
126     *
127     * text is a *format* string for outputing error. It must
128     * contain only two '%s', the first will be replaced
129     * by the sockhost from the client_p, and the latter will
130     * be taken from sys_errlist[errno].
131     *
132     * client_p if not NULL, is the *LOCAL* client associated with
133     * the error.
134     *
135     * Cannot use perror() within daemon. stderr is closed in
136     * ircd and cannot be used. And, worse yet, it might have
137     * been reassigned to a normal connection...
138     *
139     * Actually stderr is still there IFF ircd was run with -s --Rodder
140     */
141    
142     void
143     report_error(int level, const char* text, const char* who, int error)
144     {
145     who = (who) ? who : "";
146    
147     sendto_realops_flags(UMODE_DEBUG, level, text, who, strerror(error));
148     log_oper_action(LOG_IOERR_TYPE, NULL, "%s %s %s\n", who, text, strerror(error));
149     ilog(L_ERROR, text, who, strerror(error));
150     }
151    
152     /*
153     * setup_socket()
154     *
155     * Set the socket non-blocking, and other wonderful bits.
156     */
157     static void *
158     setup_socket(va_list args)
159     {
160     int fd = va_arg(args, int);
161     int opt = 1;
162    
163     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &opt, sizeof(opt));
164    
165     #ifdef IPTOS_LOWDELAY
166     opt = IPTOS_LOWDELAY;
167     setsockopt(fd, IPPROTO_IP, IP_TOS, (char *) &opt, sizeof(opt));
168     #endif
169    
170     #ifndef _WIN32
171     fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
172     #endif
173    
174     return NULL;
175     }
176    
177     /*
178     * init_comm()
179     *
180     * Initializes comm subsystem.
181     */
182     void
183     init_comm(void)
184     {
185     setup_socket_cb = register_callback("setup_socket", setup_socket);
186     init_netio();
187     }
188    
189     /*
190     * close_connection
191     * Close the physical connection. This function must make
192     * MyConnect(client_p) == FALSE, and set client_p->from == NULL.
193     */
194     void
195     close_connection(struct Client *client_p)
196     {
197     struct ConfItem *conf;
198     struct AccessItem *aconf;
199     struct ClassItem *aclass;
200    
201     assert(NULL != client_p);
202    
203 michael 683 if (!IsDead(client_p))
204     {
205     /* attempt to flush any pending dbufs. Evil, but .. -- adrian */
206     /* there is still a chance that we might send data to this socket
207     * even if it is marked as blocked (COMM_SELECT_READ handler is called
208     * before COMM_SELECT_WRITE). Let's try, nothing to lose.. -adx
209     */
210     ClearSendqBlocked(client_p);
211     send_queued_write(client_p);
212     }
213    
214 adx 30 if (IsServer(client_p))
215     {
216 michael 896 ++ServerStats.is_sv;
217     ServerStats.is_sbs += client_p->localClient->send.bytes;
218     ServerStats.is_sbr += client_p->localClient->recv.bytes;
219     ServerStats.is_sti += CurrentTime - client_p->firsttime;
220 adx 30
221     /* XXX Does this even make any sense at all anymore?
222     * scheduling a 'quick' reconnect could cause a pile of
223     * nick collides under TSora protocol... -db
224     */
225     /*
226     * If the connection has been up for a long amount of time, schedule
227     * a 'quick' reconnect, else reset the next-connect cycle.
228     */
229     if ((conf = find_conf_exact(SERVER_TYPE,
230     client_p->name, client_p->username,
231     client_p->host)))
232     {
233     /*
234     * Reschedule a faster reconnect, if this was a automatically
235     * connected configuration entry. (Note that if we have had
236     * a rehash in between, the status has been changed to
237     * CONF_ILLEGAL). But only do this if it was a "good" link.
238     */
239     aconf = (struct AccessItem *)map_to_conf(conf);
240     aclass = (struct ClassItem *)map_to_conf(aconf->class_ptr);
241     aconf->hold = time(NULL);
242     aconf->hold += (aconf->hold - client_p->since > HANGONGOODLINK) ?
243     HANGONRETRYDELAY : ConFreq(aclass);
244     if (nextconnect > aconf->hold)
245     nextconnect = aconf->hold;
246     }
247     }
248     else if (IsClient(client_p))
249     {
250 michael 896 ++ServerStats.is_cl;
251     ServerStats.is_cbs += client_p->localClient->send.bytes;
252     ServerStats.is_cbr += client_p->localClient->recv.bytes;
253     ServerStats.is_cti += CurrentTime - client_p->firsttime;
254 adx 30 }
255     else
256 michael 896 ++ServerStats.is_ni;
257 adx 30
258     #ifdef HAVE_LIBCRYPTO
259     if (client_p->localClient->fd.ssl)
260 michael 451 {
261     SSL_set_shutdown(client_p->localClient->fd.ssl, SSL_RECEIVED_SHUTDOWN);
262    
263     if (!SSL_shutdown(client_p->localClient->fd.ssl))
264     SSL_shutdown(client_p->localClient->fd.ssl);
265     }
266 adx 30 #endif
267     if (client_p->localClient->fd.flags.open)
268     fd_close(&client_p->localClient->fd);
269    
270     if (HasServlink(client_p))
271     {
272     if (client_p->localClient->ctrlfd.flags.open)
273     fd_close(&client_p->localClient->ctrlfd);
274     }
275    
276     dbuf_clear(&client_p->localClient->buf_sendq);
277     dbuf_clear(&client_p->localClient->buf_recvq);
278    
279     MyFree(client_p->localClient->passwd);
280     detach_conf(client_p, CONF_TYPE);
281     client_p->from = NULL; /* ...this should catch them! >:) --msa */
282     }
283    
284     #ifdef HAVE_LIBCRYPTO
285     /*
286     * ssl_handshake - let OpenSSL initialize the protocol. Register for
287     * read/write events if necessary.
288     */
289     static void
290     ssl_handshake(int fd, struct Client *client_p)
291     {
292     int ret = SSL_accept(client_p->localClient->fd.ssl);
293    
294     if (ret <= 0)
295     switch (SSL_get_error(client_p->localClient->fd.ssl, ret))
296     {
297     case SSL_ERROR_WANT_WRITE:
298     comm_setselect(&client_p->localClient->fd, COMM_SELECT_WRITE,
299     (PF *) ssl_handshake, client_p, 0);
300     return;
301    
302     case SSL_ERROR_WANT_READ:
303     comm_setselect(&client_p->localClient->fd, COMM_SELECT_READ,
304     (PF *) ssl_handshake, client_p, 0);
305     return;
306    
307     default:
308     exit_client(client_p, client_p, "Error during SSL handshake");
309     return;
310     }
311    
312     execute_callback(auth_cb, client_p);
313     }
314     #endif
315    
316     /*
317     * add_connection - creates a client which has just connected to us on
318     * the given fd. The sockhost field is initialized with the ip# of the host.
319     * An unique id is calculated now, in case it is needed for auth.
320     * The client is sent to the auth module for verification, and not put in
321     * any client list yet.
322     */
323     void
324 michael 549 add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
325 adx 30 {
326     struct Client *new_client;
327 michael 549
328 adx 30 assert(NULL != listener);
329    
330 michael 549 new_client = make_client(NULL);
331 adx 30
332     fd_open(&new_client->localClient->fd, fd, 1,
333     (listener->flags & LISTENER_SSL) ?
334     "Incoming SSL connection" : "Incoming connection");
335    
336     /*
337     * copy address to 'sockhost' as a string, copy it to host too
338     * so we have something valid to put into error messages...
339     */
340 michael 549 memcpy(&new_client->localClient->ip, irn, sizeof(struct irc_ssaddr));
341 adx 30
342     irc_getnameinfo((struct sockaddr*)&new_client->localClient->ip,
343     new_client->localClient->ip.ss_len, new_client->sockhost,
344     HOSTIPLEN, NULL, 0, NI_NUMERICHOST);
345     new_client->localClient->aftype = new_client->localClient->ip.ss.ss_family;
346     #ifdef IPV6
347 michael 549 if (new_client->sockhost[0] == ':')
348 adx 30 strlcat(new_client->host, "0", HOSTLEN+1);
349    
350     if (new_client->localClient->aftype == AF_INET6 &&
351     ConfigFileEntry.dot_in_ip6_addr == 1)
352     {
353     strlcat(new_client->host, new_client->sockhost,HOSTLEN+1);
354     strlcat(new_client->host, ".", HOSTLEN+1);
355 michael 549 }
356     else
357 adx 30 #endif
358     strlcat(new_client->host, new_client->sockhost,HOSTLEN+1);
359    
360     new_client->localClient->listener = listener;
361     ++listener->ref_count;
362    
363     #ifdef HAVE_LIBCRYPTO
364 michael 549 if (listener->flags & LISTENER_SSL)
365 adx 30 {
366     if ((new_client->localClient->fd.ssl = SSL_new(ServerInfo.ctx)) == NULL)
367     {
368     ilog(L_CRIT, "SSL_new() ERROR! -- %s",
369     ERR_error_string(ERR_get_error(), NULL));
370    
371     SetDead(new_client);
372     exit_client(new_client, new_client, "SSL_new failed");
373     return;
374     }
375    
376     SSL_set_fd(new_client->localClient->fd.ssl, fd);
377     ssl_handshake(0, new_client);
378     }
379     else
380     #endif
381     execute_callback(auth_cb, new_client);
382     }
383    
384     /*
385     * stolen from squid - its a neat (but overused! :) routine which we
386     * can use to see whether we can ignore this errno or not. It is
387     * generally useful for non-blocking network IO related errnos.
388     * -- adrian
389     */
390     int
391     ignoreErrno(int ierrno)
392     {
393     switch (ierrno)
394     {
395     case EINPROGRESS:
396     case EWOULDBLOCK:
397     #if EAGAIN != EWOULDBLOCK
398     case EAGAIN:
399     #endif
400     case EALREADY:
401     case EINTR:
402     #ifdef ERESTART
403     case ERESTART:
404     #endif
405     return 1;
406     default:
407     return 0;
408     }
409     }
410    
411     /*
412     * comm_settimeout() - set the socket timeout
413     *
414     * Set the timeout for the fd
415     */
416     void
417     comm_settimeout(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
418     {
419     assert(fd->flags.open);
420    
421     fd->timeout = CurrentTime + (timeout / 1000);
422     fd->timeout_handler = callback;
423     fd->timeout_data = cbdata;
424     }
425    
426     /*
427     * comm_setflush() - set a flush function
428     *
429     * A flush function is simply a function called if found during
430     * comm_timeouts(). Its basically a second timeout, except in this case
431     * I'm too lazy to implement multiple timeout functions! :-)
432     * its kinda nice to have it separate, since this is designed for
433     * flush functions, and when comm_close() is implemented correctly
434     * with close functions, we _actually_ don't call comm_close() here ..
435     * -- originally Adrian's notes
436     * comm_close() is replaced with fd_close() in fdlist.c
437     */
438     void
439     comm_setflush(fde_t *fd, time_t timeout, PF *callback, void *cbdata)
440     {
441     assert(fd->flags.open);
442    
443     fd->flush_timeout = CurrentTime + (timeout / 1000);
444     fd->flush_handler = callback;
445     fd->flush_data = cbdata;
446     }
447    
448     /*
449     * comm_checktimeouts() - check the socket timeouts
450     *
451     * All this routine does is call the given callback/cbdata, without closing
452     * down the file descriptor. When close handlers have been implemented,
453     * this will happen.
454     */
455     void
456     comm_checktimeouts(void *notused)
457     {
458     int i;
459     fde_t *F;
460     PF *hdl;
461     void *data;
462    
463     for (i = 0; i < FD_HASH_SIZE; i++)
464     for (F = fd_hash[i]; F != NULL; F = fd_next_in_loop)
465     {
466     assert(F->flags.open);
467     fd_next_in_loop = F->hnext;
468    
469     /* check flush functions */
470     if (F->flush_handler && F->flush_timeout > 0 &&
471     F->flush_timeout < CurrentTime)
472     {
473     hdl = F->flush_handler;
474     data = F->flush_data;
475     comm_setflush(F, 0, NULL, NULL);
476     hdl(F, data);
477     }
478    
479     /* check timeouts */
480     if (F->timeout_handler && F->timeout > 0 &&
481     F->timeout < CurrentTime)
482     {
483     /* Call timeout handler */
484     hdl = F->timeout_handler;
485     data = F->timeout_data;
486     comm_settimeout(F, 0, NULL, NULL);
487     hdl(F, data);
488     }
489     }
490     }
491    
492     /*
493     * void comm_connect_tcp(int fd, const char *host, unsigned short port,
494     * struct sockaddr *clocal, int socklen,
495     * CNCB *callback, void *data, int aftype, int timeout)
496     * Input: An fd to connect with, a host and port to connect to,
497     * a local sockaddr to connect from + length(or NULL to use the
498     * default), a callback, the data to pass into the callback, the
499     * address family.
500     * Output: None.
501     * Side-effects: A non-blocking connection to the host is started, and
502     * if necessary, set up for selection. The callback given
503     * may be called now, or it may be called later.
504     */
505     void
506     comm_connect_tcp(fde_t *fd, const char *host, unsigned short port,
507     struct sockaddr *clocal, int socklen, CNCB *callback,
508     void *data, int aftype, int timeout)
509     {
510     struct addrinfo hints, *res;
511     char portname[PORTNAMELEN+1];
512    
513     assert(callback);
514     fd->connect.callback = callback;
515     fd->connect.data = data;
516    
517     fd->connect.hostaddr.ss.ss_family = aftype;
518     fd->connect.hostaddr.ss_port = htons(port);
519    
520     /* Note that we're using a passed sockaddr here. This is because
521     * generally you'll be bind()ing to a sockaddr grabbed from
522     * getsockname(), so this makes things easier.
523     * XXX If NULL is passed as local, we should later on bind() to the
524     * virtual host IP, for completeness.
525     * -- adrian
526     */
527     if ((clocal != NULL) && (bind(fd->fd, clocal, socklen) < 0))
528     {
529     /* Failure, call the callback with COMM_ERR_BIND */
530     comm_connect_callback(fd, COMM_ERR_BIND);
531     /* ... and quit */
532     return;
533     }
534    
535     /* Next, if we have been given an IP, get the addr and skip the
536     * DNS check (and head direct to comm_connect_tryconnect().
537     */
538     memset(&hints, 0, sizeof(hints));
539     hints.ai_family = AF_UNSPEC;
540     hints.ai_socktype = SOCK_STREAM;
541     hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
542    
543     snprintf(portname, PORTNAMELEN, "%d", port);
544    
545     if (irc_getaddrinfo(host, portname, &hints, &res))
546     {
547     /* Send the DNS request, for the next level */
548     fd->dns_query = MyMalloc(sizeof(struct DNSQuery));
549     fd->dns_query->ptr = fd;
550     fd->dns_query->callback = comm_connect_dns_callback;
551 db 871 if (aftype == AF_INET6)
552     gethost_byname_type(host, fd->dns_query, T_AAAA);
553     else
554     gethost_byname_type(host, fd->dns_query, T_A);
555 adx 30 }
556     else
557     {
558     /* We have a valid IP, so we just call tryconnect */
559     /* Make sure we actually set the timeout here .. */
560     assert(res != NULL);
561     memcpy(&fd->connect.hostaddr, res->ai_addr, res->ai_addrlen);
562     fd->connect.hostaddr.ss_len = res->ai_addrlen;
563     fd->connect.hostaddr.ss.ss_family = res->ai_family;
564     irc_freeaddrinfo(res);
565     comm_settimeout(fd, timeout*1000, comm_connect_timeout, NULL);
566     comm_connect_tryconnect(fd, NULL);
567     }
568     }
569    
570     /*
571     * comm_connect_callback() - call the callback, and continue with life
572     */
573     static void
574     comm_connect_callback(fde_t *fd, int status)
575     {
576     CNCB *hdl;
577    
578     /* This check is gross..but probably necessary */
579     if (fd->connect.callback == NULL)
580     return;
581    
582     /* Clear the connect flag + handler */
583     hdl = fd->connect.callback;
584     fd->connect.callback = NULL;
585    
586     /* Clear the timeout handler */
587     comm_settimeout(fd, 0, NULL, NULL);
588    
589     /* Call the handler */
590     hdl(fd, status, fd->connect.data);
591     }
592    
593     /*
594     * comm_connect_timeout() - this gets called when the socket connection
595     * times out. This *only* can be called once connect() is initially
596     * called ..
597     */
598     static void
599     comm_connect_timeout(fde_t *fd, void *notused)
600     {
601     /* error! */
602     comm_connect_callback(fd, COMM_ERR_TIMEOUT);
603     }
604    
605     /*
606     * comm_connect_dns_callback() - called at the completion of the DNS request
607     *
608     * The DNS request has completed, so if we've got an error, return it,
609     * otherwise we initiate the connect()
610     */
611     static void
612     comm_connect_dns_callback(void *vptr, struct DNSReply *reply)
613     {
614     fde_t *F = vptr;
615    
616     if (reply == NULL)
617     {
618     MyFree(F->dns_query);
619     F->dns_query = NULL;
620     comm_connect_callback(F, COMM_ERR_DNS);
621     return;
622     }
623    
624     /* No error, set a 10 second timeout */
625     comm_settimeout(F, 30*1000, comm_connect_timeout, NULL);
626    
627     /* Copy over the DNS reply info so we can use it in the connect() */
628     /*
629     * Note we don't fudge the refcount here, because we aren't keeping
630     * the DNS record around, and the DNS cache is gone anyway..
631     * -- adrian
632     */
633     memcpy(&F->connect.hostaddr, &reply->addr, reply->addr.ss_len);
634     /* The cast is hacky, but safe - port offset is same on v4 and v6 */
635     ((struct sockaddr_in *) &F->connect.hostaddr)->sin_port =
636     F->connect.hostaddr.ss_port;
637     F->connect.hostaddr.ss_len = reply->addr.ss_len;
638    
639     /* Now, call the tryconnect() routine to try a connect() */
640     MyFree(F->dns_query);
641     F->dns_query = NULL;
642     comm_connect_tryconnect(F, NULL);
643     }
644    
645     /* static void comm_connect_tryconnect(int fd, void *notused)
646     * Input: The fd, the handler data(unused).
647     * Output: None.
648     * Side-effects: Try and connect with pending connect data for the FD. If
649     * we succeed or get a fatal error, call the callback.
650     * Otherwise, it is still blocking or something, so register
651     * to select for a write event on this FD.
652     */
653     static void
654     comm_connect_tryconnect(fde_t *fd, void *notused)
655     {
656     int retval;
657    
658     /* This check is needed or re-entrant s_bsd_* like sigio break it. */
659     if (fd->connect.callback == NULL)
660     return;
661    
662     /* Try the connect() */
663     retval = connect(fd->fd, (struct sockaddr *) &fd->connect.hostaddr,
664     fd->connect.hostaddr.ss_len);
665    
666     /* Error? */
667     if (retval < 0)
668     {
669     #ifdef _WIN32
670     errno = WSAGetLastError();
671     #endif
672     /*
673     * If we get EISCONN, then we've already connect()ed the socket,
674     * which is a good thing.
675     * -- adrian
676     */
677     if (errno == EISCONN)
678     comm_connect_callback(fd, COMM_OK);
679     else if (ignoreErrno(errno))
680     /* Ignore error? Reschedule */
681     comm_setselect(fd, COMM_SELECT_WRITE, comm_connect_tryconnect,
682     NULL, 0);
683     else
684     /* Error? Fail with COMM_ERR_CONNECT */
685     comm_connect_callback(fd, COMM_ERR_CONNECT);
686     return;
687     }
688    
689     /* If we get here, we've suceeded, so call with COMM_OK */
690     comm_connect_callback(fd, COMM_OK);
691     }
692    
693     /*
694     * comm_errorstr() - return an error string for the given error condition
695     */
696     const char *
697     comm_errstr(int error)
698     {
699     if (error < 0 || error >= COMM_ERR_MAX)
700     return "Invalid error number!";
701     return comm_err_str[error];
702     }
703    
704     /*
705     * comm_open() - open a socket
706     *
707     * This is a highly highly cut down version of squid's comm_open() which
708     * for the most part emulates socket(), *EXCEPT* it fails if we're about
709     * to run out of file descriptors.
710     */
711     int
712     comm_open(fde_t *F, int family, int sock_type, int proto, const char *note)
713     {
714     int fd;
715    
716     /* First, make sure we aren't going to run out of file descriptors */
717     if (number_fd >= hard_fdlimit)
718     {
719     errno = ENFILE;
720     return -1;
721     }
722    
723     /*
724     * Next, we try to open the socket. We *should* drop the reserved FD
725     * limit if/when we get an error, but we can deal with that later.
726     * XXX !!! -- adrian
727     */
728     fd = socket(family, sock_type, proto);
729     if (fd < 0)
730     {
731     #ifdef _WIN32
732     errno = WSAGetLastError();
733     #endif
734     return -1; /* errno will be passed through, yay.. */
735     }
736    
737     execute_callback(setup_socket_cb, fd);
738    
739     /* update things in our fd tracking */
740     fd_open(F, fd, 1, note);
741     return 0;
742     }
743    
744     /*
745     * comm_accept() - accept an incoming connection
746     *
747     * This is a simple wrapper for accept() which enforces FD limits like
748     * comm_open() does. Returned fd must be either closed or tagged with
749     * fd_open (this function no longer does it).
750     */
751     int
752     comm_accept(struct Listener *lptr, struct irc_ssaddr *pn)
753     {
754     int newfd;
755     socklen_t addrlen = sizeof(struct irc_ssaddr);
756    
757     if (number_fd >= hard_fdlimit)
758     {
759     errno = ENFILE;
760     return -1;
761     }
762    
763     /*
764     * Next, do the accept(). if we get an error, we should drop the
765     * reserved fd limit, but we can deal with that when comm_open()
766     * also does it. XXX -- adrian
767     */
768     newfd = accept(lptr->fd.fd, (struct sockaddr *)pn, (socklen_t *)&addrlen);
769     if (newfd < 0)
770     {
771     #ifdef _WIN32
772     errno = WSAGetLastError();
773     #endif
774     return -1;
775     }
776    
777     #ifdef IPV6
778     remove_ipv6_mapping(pn);
779     #else
780     pn->ss_len = addrlen;
781     #endif
782    
783     execute_callback(setup_socket_cb, newfd);
784    
785     /* .. and return */
786     return newfd;
787     }
788    
789     /*
790     * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
791     * This function should really inspect the struct itself rather than relying
792     * on inet_pton and inet_ntop. OSes with IPv6 mapping listening on both
793     * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
794     *
795     */
796     #ifdef IPV6
797     void
798     remove_ipv6_mapping(struct irc_ssaddr *addr)
799     {
800     if (addr->ss.ss_family == AF_INET6)
801     {
802     struct sockaddr_in6 *v6;
803    
804     v6 = (struct sockaddr_in6*)addr;
805     if (IN6_IS_ADDR_V4MAPPED(&v6->sin6_addr))
806     {
807     char v4ip[HOSTIPLEN];
808     struct sockaddr_in *v4 = (struct sockaddr_in*)addr;
809     inetntop(AF_INET6, &v6->sin6_addr, v4ip, HOSTIPLEN);
810     inet_pton(AF_INET, v4ip, &v4->sin_addr);
811     addr->ss.ss_family = AF_INET;
812     addr->ss_len = sizeof(struct sockaddr_in);
813     }
814     else
815     addr->ss_len = sizeof(struct sockaddr_in6);
816     }
817     else
818     addr->ss_len = sizeof(struct sockaddr_in);
819     }
820     #endif

Properties

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svn:eol-style native
svn:keywords Id Revision