Disconnect hostapd from building in base
[dragonfly.git] / contrib / ldns / net.c
1 /*
2  * net.c
3  *
4  * Network implementation
5  * All network related functions are grouped here
6  *
7  * a Net::DNS like library for C
8  *
9  * (c) NLnet Labs, 2004-2006
10  *
11  * See the file LICENSE for the license
12  */
13
14 #include <ldns/config.h>
15
16 #include <ldns/ldns.h>
17
18 #ifdef HAVE_NETINET_IN_H
19 #include <netinet/in.h>
20 #endif
21 #ifdef HAVE_SYS_SOCKET_H
22 #include <sys/socket.h>
23 #endif
24 #ifdef HAVE_NETDB_H
25 #include <netdb.h>
26 #endif
27 #ifdef HAVE_ARPA_INET_H
28 #include <arpa/inet.h>
29 #endif
30 #include <sys/time.h>
31 #include <errno.h>
32 #include <fcntl.h>
33
34 ldns_status
35 ldns_send(ldns_pkt **result_packet, ldns_resolver *r, const ldns_pkt *query_pkt)
36 {
37         ldns_buffer *qb;
38         ldns_status result;
39         ldns_rdf *tsig_mac = NULL;
40
41         qb = ldns_buffer_new(LDNS_MIN_BUFLEN);
42
43         if (query_pkt && ldns_pkt_tsig(query_pkt)) {
44                 tsig_mac = ldns_rr_rdf(ldns_pkt_tsig(query_pkt), 3);
45         }
46
47         if (!query_pkt ||
48             ldns_pkt2buffer_wire(qb, query_pkt) != LDNS_STATUS_OK) {
49                 result = LDNS_STATUS_ERR;
50         } else {
51                 result = ldns_send_buffer(result_packet, r, qb, tsig_mac);
52         }
53
54         ldns_buffer_free(qb);
55
56         return result;
57 }
58
59 ldns_status
60 ldns_send_buffer(ldns_pkt **result, ldns_resolver *r, ldns_buffer *qb, ldns_rdf *tsig_mac)
61 {
62         uint8_t i;
63         
64         struct sockaddr_storage *ns;
65         size_t ns_len;
66         struct timeval tv_s;
67         struct timeval tv_e;
68
69         ldns_rdf **ns_array;
70         size_t *rtt;
71         ldns_pkt *reply;
72         bool all_servers_rtt_inf;
73         uint8_t retries;
74
75         uint8_t *reply_bytes = NULL;
76         size_t reply_size = 0;
77         ldns_status status, send_status;
78
79         assert(r != NULL);
80
81         status = LDNS_STATUS_OK;
82         rtt = ldns_resolver_rtt(r);
83         ns_array = ldns_resolver_nameservers(r);
84         reply = NULL; 
85         ns_len = 0;
86
87         all_servers_rtt_inf = true;
88
89         if (ldns_resolver_random(r)) {
90                 ldns_resolver_nameservers_randomize(r);
91         }
92
93         /* loop through all defined nameservers */
94         for (i = 0; i < ldns_resolver_nameserver_count(r); i++) {
95                 if (rtt[i] == LDNS_RESOLV_RTT_INF) {
96                         /* not reachable nameserver! */
97                         continue;
98                 }
99
100                 /* maybe verbosity setting?
101                 printf("Sending to ");
102                 ldns_rdf_print(stdout, ns_array[i]);
103                 printf("\n");
104                 */
105                 ns = ldns_rdf2native_sockaddr_storage(ns_array[i],
106                                 ldns_resolver_port(r), &ns_len);
107
108
109 #ifndef S_SPLINT_S
110                 if ((ns->ss_family == AF_INET) &&
111                                 (ldns_resolver_ip6(r) == LDNS_RESOLV_INET6)) {
112                         /* not reachable */
113                         LDNS_FREE(ns);
114                         continue;
115                 }
116
117                 if ((ns->ss_family == AF_INET6) &&
118                                  (ldns_resolver_ip6(r) == LDNS_RESOLV_INET)) {
119                         /* not reachable */
120                         LDNS_FREE(ns);
121                         continue;
122                 }
123 #endif
124
125                 all_servers_rtt_inf = false;
126
127                 gettimeofday(&tv_s, NULL);
128
129                 send_status = LDNS_STATUS_ERR;
130
131                 /* reply_bytes implicitly handles our error */
132                 if (1 == ldns_resolver_usevc(r)) {
133                         for (retries = ldns_resolver_retry(r); retries > 0; retries--) {
134                                 send_status = 
135                                         ldns_tcp_send(&reply_bytes, qb, ns, 
136                                         (socklen_t)ns_len, ldns_resolver_timeout(r), 
137                                         &reply_size);
138                                 if (send_status == LDNS_STATUS_OK) {
139                                         break;
140                                 }
141                         }
142                 } else {
143                         for (retries = ldns_resolver_retry(r); retries > 0; retries--) {
144                                 /* ldns_rdf_print(stdout, ns_array[i]); */
145                                 send_status = 
146                                         ldns_udp_send(&reply_bytes, qb, ns, 
147                                                         (socklen_t)ns_len, ldns_resolver_timeout(r), 
148                                                         &reply_size);
149                                 
150                                 if (send_status == LDNS_STATUS_OK) {
151                                         break;
152                                 }
153                         }
154                 }
155
156                 if (send_status != LDNS_STATUS_OK) {
157                         ldns_resolver_set_nameserver_rtt(r, i, LDNS_RESOLV_RTT_INF);
158                         status = send_status;
159                 }
160                 
161                 /* obey the fail directive */
162                 if (!reply_bytes) {
163                         /* the current nameserver seems to have a problem, blacklist it */
164                         if (ldns_resolver_fail(r)) {
165                                 LDNS_FREE(ns);
166                                 return LDNS_STATUS_ERR;
167                         } else {
168                                 LDNS_FREE(ns);
169                                 continue;
170                         }
171                 } 
172                 
173                 status = ldns_wire2pkt(&reply, reply_bytes, reply_size);
174                 if (status != LDNS_STATUS_OK) {
175                         LDNS_FREE(reply_bytes);
176                         LDNS_FREE(ns);
177                         return status;
178                 }
179                 
180                 LDNS_FREE(ns);
181                 gettimeofday(&tv_e, NULL);
182
183                 if (reply) {
184                         ldns_pkt_set_querytime(reply, (uint32_t)
185                                 ((tv_e.tv_sec - tv_s.tv_sec) * 1000) +
186                                 (tv_e.tv_usec - tv_s.tv_usec) / 1000);
187                         ldns_pkt_set_answerfrom(reply,
188                                         ldns_rdf_clone(ns_array[i]));
189                         ldns_pkt_set_timestamp(reply, tv_s);
190                         ldns_pkt_set_size(reply, reply_size);
191                         break;
192                 } else {
193                         if (ldns_resolver_fail(r)) {
194                                 /* if fail is set bail out, after the first
195                                  * one */
196                                 break;
197                         }
198                 }
199
200                 /* wait retrans seconds... */
201                 sleep((unsigned int) ldns_resolver_retrans(r));
202         }
203
204         if (all_servers_rtt_inf) {
205                 LDNS_FREE(reply_bytes);
206                 return LDNS_STATUS_RES_NO_NS;
207         }
208 #ifdef HAVE_SSL
209         if (tsig_mac && reply && reply_bytes) {
210                 if (!ldns_pkt_tsig_verify(reply,
211                                           reply_bytes,
212                                           reply_size,
213                                           ldns_resolver_tsig_keyname(r),
214                                           ldns_resolver_tsig_keydata(r), tsig_mac)) {
215                         status = LDNS_STATUS_CRYPTO_TSIG_BOGUS;
216                 }
217         }
218 #else
219         (void)tsig_mac;
220 #endif /* HAVE_SSL */
221
222         LDNS_FREE(reply_bytes);
223         if (result) {
224                 *result = reply;
225         }
226
227         return status;
228 }
229
230 /** best effort to set nonblocking */
231 static void
232 ldns_sock_nonblock(int sockfd)
233 {
234 #ifdef HAVE_FCNTL
235         int flag;
236         if((flag = fcntl(sockfd, F_GETFL)) != -1) {
237                 flag |= O_NONBLOCK;
238                 if(fcntl(sockfd, F_SETFL, flag) == -1) {
239                         /* ignore error, continue blockingly */
240                 }
241         }
242 #elif defined(HAVE_IOCTLSOCKET)
243         unsigned long on = 1;
244         if(ioctlsocket(sockfd, FIONBIO, &on) != 0) {
245                 /* ignore error, continue blockingly */
246         }
247 #endif
248 }
249
250 /** best effort to set blocking */
251 static void
252 ldns_sock_block(int sockfd)
253 {
254 #ifdef HAVE_FCNTL
255         int flag;
256         if((flag = fcntl(sockfd, F_GETFL)) != -1) {
257                 flag &= ~O_NONBLOCK;
258                 if(fcntl(sockfd, F_SETFL, flag) == -1) {
259                         /* ignore error, continue */
260                 }
261         }
262 #elif defined(HAVE_IOCTLSOCKET)
263         unsigned long off = 0;
264         if(ioctlsocket(sockfd, FIONBIO, &off) != 0) {
265                 /* ignore error, continue */
266         }
267 #endif
268 }
269
270 /** wait for a socket to become ready */
271 static int
272 ldns_sock_wait(int sockfd, struct timeval timeout, int write)
273 {
274         int ret;
275 #ifndef S_SPLINT_S
276         fd_set fds;
277         FD_ZERO(&fds);
278         FD_SET(FD_SET_T sockfd, &fds);
279         if(write)
280                 ret = select(sockfd+1, NULL, &fds, NULL, &timeout);
281         else
282                 ret = select(sockfd+1, &fds, NULL, NULL, &timeout);
283 #endif
284         if(ret == 0)
285                 /* timeout expired */
286                 return 0;
287         else if(ret == -1)
288                 /* error */
289                 return 0;
290         return 1;
291 }
292
293 ldns_status
294 ldns_udp_send(uint8_t **result, ldns_buffer *qbin, const struct sockaddr_storage *to,
295                 socklen_t tolen, struct timeval timeout, size_t *answer_size)
296 {
297         int sockfd;
298         uint8_t *answer;
299
300         sockfd = ldns_udp_bgsend(qbin, to, tolen, timeout);
301
302         if (sockfd == 0) {
303                 return LDNS_STATUS_SOCKET_ERROR;
304         }
305
306         /* wait for an response*/
307         if(!ldns_sock_wait(sockfd, timeout, 0)) {
308 #ifndef USE_WINSOCK
309                 close(sockfd);
310 #else
311                 closesocket(sockfd);
312 #endif
313                 return LDNS_STATUS_NETWORK_ERR;
314         }
315
316         /* set to nonblocking, so if the checksum is bad, it becomes
317          * an EGAIN error and the ldns_udp_send function does not block,
318          * but returns a 'NETWORK_ERROR' much like a timeout. */
319         ldns_sock_nonblock(sockfd);
320
321         answer = ldns_udp_read_wire(sockfd, answer_size, NULL, NULL);
322 #ifndef USE_WINSOCK
323         close(sockfd);
324 #else
325         closesocket(sockfd);
326 #endif
327
328         if (*answer_size == 0) {
329                 /* oops */
330                 return LDNS_STATUS_NETWORK_ERR;
331         }
332
333         *result = answer;
334         return LDNS_STATUS_OK;
335 }
336
337 int
338 ldns_udp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, 
339                 struct timeval timeout)
340 {
341         int sockfd;
342
343         sockfd = ldns_udp_connect(to, timeout);
344
345         if (sockfd == 0) {
346                 return 0;
347         }
348
349         if (ldns_udp_send_query(qbin, sockfd, to, tolen) == 0) {
350 #ifndef USE_WINSOCK
351                 close(sockfd);
352 #else
353                 closesocket(sockfd);
354 #endif
355                 return 0;
356         }
357         return sockfd;
358 }
359
360 int
361 ldns_udp_connect(const struct sockaddr_storage *to, struct timeval ATTR_UNUSED(timeout))
362 {
363         int sockfd;
364
365 #ifndef S_SPLINT_S
366         if ((sockfd = socket((int)((struct sockaddr*)to)->sa_family, SOCK_DGRAM, 
367                                         IPPROTO_UDP)) 
368                         == -1) {
369                 return 0;
370         }
371 #endif
372         return sockfd;
373 }
374
375 int
376 ldns_tcp_connect(const struct sockaddr_storage *to, socklen_t tolen, 
377                 struct timeval timeout)
378 {
379         int sockfd;
380
381 #ifndef S_SPLINT_S
382         if ((sockfd = socket((int)((struct sockaddr*)to)->sa_family, SOCK_STREAM, 
383                                         IPPROTO_TCP)) == -1) {
384                 return 0;
385         }
386 #endif
387
388         /* perform nonblocking connect, to be able to wait with select() */
389         ldns_sock_nonblock(sockfd);
390         if (connect(sockfd, (struct sockaddr*)to, tolen) == -1) {
391 #ifndef USE_WINSOCK
392 #ifdef EINPROGRESS
393                 if(errno != EINPROGRESS) {
394 #else
395                 if(1) {
396 #endif
397                         close(sockfd);
398                         return 0;
399                 }
400 #else /* USE_WINSOCK */
401                 if(WSAGetLastError() != WSAEINPROGRESS &&
402                         WSAGetLastError() != WSAEWOULDBLOCK) {
403                         closesocket(sockfd);
404                         return 0;
405                 }
406 #endif
407                 /* error was only telling us that it would block */
408         }
409
410         /* wait(write) until connected or error */
411         while(1) {
412                 int error = 0;
413                 socklen_t len = (socklen_t)sizeof(error);
414
415                 if(!ldns_sock_wait(sockfd, timeout, 1)) {
416 #ifndef USE_WINSOCK
417                         close(sockfd);
418 #else
419                         closesocket(sockfd);
420 #endif
421                         return 0;
422                 }
423
424                 /* check if there is a pending error for nonblocking connect */
425                 if(getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void*)&error,
426                         &len) < 0) {
427 #ifndef USE_WINSOCK
428                         error = errno; /* on solaris errno is error */
429 #else
430                         error = WSAGetLastError();
431 #endif
432                 }
433 #ifndef USE_WINSOCK
434 #if defined(EINPROGRESS) && defined(EWOULDBLOCK)
435                 if(error == EINPROGRESS || error == EWOULDBLOCK)
436                         continue; /* try again */
437 #endif
438                 else if(error != 0) {
439                         close(sockfd);
440                         /* error in errno for our user */
441                         errno = error;
442                         return 0;
443                 }
444 #else /* USE_WINSOCK */
445                 if(error == WSAEINPROGRESS)
446                         continue;
447                 else if(error == WSAEWOULDBLOCK)
448                         continue;
449                 else if(error != 0) {
450                         closesocket(sockfd);
451                         errno = error;
452                         return 0;
453                 }
454 #endif /* USE_WINSOCK */
455                 /* connected */
456                 break;
457         }
458
459         /* set the socket blocking again */
460         ldns_sock_block(sockfd);
461
462         return sockfd;
463 }
464
465 ssize_t
466 ldns_tcp_send_query(ldns_buffer *qbin, int sockfd, 
467                     const struct sockaddr_storage *to, socklen_t tolen)
468 {
469         uint8_t *sendbuf;
470         ssize_t bytes;
471
472         /* add length of packet */
473         sendbuf = LDNS_XMALLOC(uint8_t, ldns_buffer_position(qbin) + 2);
474         if(!sendbuf) return 0;
475         ldns_write_uint16(sendbuf, ldns_buffer_position(qbin));
476         memcpy(sendbuf + 2, ldns_buffer_begin(qbin), ldns_buffer_position(qbin));
477
478         bytes = sendto(sockfd, (void*)sendbuf,
479                         ldns_buffer_position(qbin) + 2, 0, (struct sockaddr *)to, tolen);
480
481         LDNS_FREE(sendbuf);
482
483         if (bytes == -1 || (size_t) bytes != ldns_buffer_position(qbin) + 2 ) {
484                 return 0;
485         }
486         return bytes;
487 }
488
489 /* don't wait for an answer */
490 ssize_t
491 ldns_udp_send_query(ldns_buffer *qbin, int sockfd, const struct sockaddr_storage *to, 
492                 socklen_t tolen)
493 {
494         ssize_t bytes;
495
496         bytes = sendto(sockfd, (void*)ldns_buffer_begin(qbin),
497                         ldns_buffer_position(qbin), 0, (struct sockaddr *)to, tolen);
498
499         if (bytes == -1 || (size_t)bytes != ldns_buffer_position(qbin)) {
500                 return 0;
501         }
502         if ((size_t) bytes != ldns_buffer_position(qbin)) {
503                 return 0;
504         }
505         return bytes;
506 }
507
508 uint8_t *
509 ldns_udp_read_wire(int sockfd, size_t *size, struct sockaddr_storage *from,
510                 socklen_t *fromlen)
511 {
512         uint8_t *wire, *wireout;
513         ssize_t wire_size;
514
515         wire = LDNS_XMALLOC(uint8_t, LDNS_MAX_PACKETLEN);
516         if (!wire) {
517                 *size = 0;
518                 return NULL;
519         }
520
521         wire_size = recvfrom(sockfd, (void*)wire, LDNS_MAX_PACKETLEN, 0, 
522                         (struct sockaddr *)from, fromlen);
523
524         /* recvfrom can also return 0 */
525         if (wire_size == -1 || wire_size == 0) {
526                 *size = 0;
527                 LDNS_FREE(wire);
528                 return NULL;
529         }
530
531         *size = (size_t)wire_size;
532         wireout = LDNS_XREALLOC(wire, uint8_t, (size_t)wire_size);
533         if(!wireout) LDNS_FREE(wire);
534
535         return wireout;
536 }
537
538 uint8_t *
539 ldns_tcp_read_wire_timeout(int sockfd, size_t *size, struct timeval timeout)
540 {
541         uint8_t *wire;
542         uint16_t wire_size;
543         ssize_t bytes = 0, rc = 0;
544
545         wire = LDNS_XMALLOC(uint8_t, 2);
546         if (!wire) {
547                 *size = 0;
548                 return NULL;
549         }
550         
551         while (bytes < 2) {
552                 if(!ldns_sock_wait(sockfd, timeout, 0)) {
553                         *size = 0;
554                         LDNS_FREE(wire);
555                         return NULL;
556                 }
557                 rc = recv(sockfd, (void*) (wire + bytes), 
558                                 (size_t) (2 - bytes), 0);
559                 if (rc == -1 || rc == 0) {
560                         *size = 0;
561                         LDNS_FREE(wire);
562                         return NULL;
563                 }
564                 bytes += rc;
565         }
566
567         wire_size = ldns_read_uint16(wire);
568         
569         LDNS_FREE(wire);
570         wire = LDNS_XMALLOC(uint8_t, wire_size);
571         if (!wire) {
572                 *size = 0;
573                 return NULL;
574         }
575         bytes = 0;
576
577         while (bytes < (ssize_t) wire_size) {
578                 if(!ldns_sock_wait(sockfd, timeout, 0)) {
579                         *size = 0;
580                         LDNS_FREE(wire);
581                         return NULL;
582                 }
583                 rc = recv(sockfd, (void*) (wire + bytes), 
584                                 (size_t) (wire_size - bytes), 0);
585                 if (rc == -1 || rc == 0) {
586                         LDNS_FREE(wire);
587                         *size = 0;
588                         return NULL;
589                 }
590                 bytes += rc;
591         }
592         
593         *size = (size_t) bytes;
594         return wire;
595 }
596
597 uint8_t *
598 ldns_tcp_read_wire(int sockfd, size_t *size)
599 {
600         uint8_t *wire;
601         uint16_t wire_size;
602         ssize_t bytes = 0, rc = 0;
603
604         wire = LDNS_XMALLOC(uint8_t, 2);
605         if (!wire) {
606                 *size = 0;
607                 return NULL;
608         }
609         
610         while (bytes < 2) {
611                 rc = recv(sockfd, (void*) (wire + bytes), 
612                                 (size_t) (2 - bytes), 0);
613                 if (rc == -1 || rc == 0) {
614                         *size = 0;
615                         LDNS_FREE(wire);
616                         return NULL;
617                 }
618                 bytes += rc;
619         }
620
621         wire_size = ldns_read_uint16(wire);
622         
623         LDNS_FREE(wire);
624         wire = LDNS_XMALLOC(uint8_t, wire_size);
625         if (!wire) {
626                 *size = 0;
627                 return NULL;
628         }
629         bytes = 0;
630
631         while (bytes < (ssize_t) wire_size) {
632                 rc = recv(sockfd, (void*) (wire + bytes), 
633                                 (size_t) (wire_size - bytes), 0);
634                 if (rc == -1 || rc == 0) {
635                         LDNS_FREE(wire);
636                         *size = 0;
637                         return NULL;
638                 }
639                 bytes += rc;
640         }
641         
642         *size = (size_t) bytes;
643         return wire;
644 }
645
646 /* keep in mind that in DNS tcp messages the first 2 bytes signal the
647  * amount data to expect
648  */
649 ldns_status
650 ldns_tcp_send(uint8_t **result,  ldns_buffer *qbin, const struct sockaddr_storage *to, 
651                 socklen_t tolen, struct timeval timeout, size_t *answer_size)
652 {
653         int sockfd;
654         uint8_t *answer;
655         
656         sockfd = ldns_tcp_bgsend(qbin, to, tolen, timeout);
657         
658         if (sockfd == 0) {
659                 return LDNS_STATUS_ERR;
660         }
661
662         answer = ldns_tcp_read_wire_timeout(sockfd, answer_size, timeout);
663 #ifndef USE_WINSOCK
664         close(sockfd);
665 #else
666         closesocket(sockfd);
667 #endif
668
669         if (*answer_size == 0) {
670                 /* oops */
671                 return LDNS_STATUS_NETWORK_ERR;
672         }
673
674         /* resize accordingly */
675         *result = LDNS_XREALLOC(answer, uint8_t, (size_t)*answer_size);
676         if(!*result) {
677                 LDNS_FREE(answer);
678                 return LDNS_STATUS_MEM_ERR;
679         }
680         return LDNS_STATUS_OK;
681 }
682
683 int
684 ldns_tcp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, 
685                 struct timeval timeout)
686 {
687         int sockfd;
688         
689         sockfd = ldns_tcp_connect(to, tolen, timeout);
690         
691         if (sockfd == 0) {
692                 return 0;
693         }
694         
695         if (ldns_tcp_send_query(qbin, sockfd, to, tolen) == 0) {
696 #ifndef USE_WINSOCK
697                 close(sockfd);
698 #else
699                 closesocket(sockfd);
700 #endif
701                 return 0;
702         }
703         
704         return sockfd;
705 }
706
707 /* code from rdata.c */
708 struct sockaddr_storage *
709 ldns_rdf2native_sockaddr_storage(const ldns_rdf *rd, uint16_t port, size_t *size)
710 {
711         struct sockaddr_storage *data;
712         struct sockaddr_in  *data_in;
713         struct sockaddr_in6 *data_in6;
714
715         data = LDNS_MALLOC(struct sockaddr_storage);
716         if (!data) {
717                 return NULL;
718         }
719                 /* zero the structure for portability */
720                 memset(data, 0, sizeof(struct sockaddr_storage));
721         if (port == 0) {
722                 port =  LDNS_PORT;
723         }
724
725         switch(ldns_rdf_get_type(rd)) {
726                 case LDNS_RDF_TYPE_A:
727 #ifndef S_SPLINT_S
728                         data->ss_family = AF_INET;
729 #endif
730                         data_in = (struct sockaddr_in*) data;
731                         data_in->sin_port = (in_port_t)htons(port);
732                         memcpy(&(data_in->sin_addr), ldns_rdf_data(rd), ldns_rdf_size(rd));
733                         *size = sizeof(struct sockaddr_in);
734                         return data;
735                 case LDNS_RDF_TYPE_AAAA:
736 #ifndef S_SPLINT_S
737                         data->ss_family = AF_INET6;
738 #endif
739                         data_in6 = (struct sockaddr_in6*) data;
740                         data_in6->sin6_port = (in_port_t)htons(port);
741                         memcpy(&data_in6->sin6_addr, ldns_rdf_data(rd), ldns_rdf_size(rd));
742                         *size = sizeof(struct sockaddr_in6);
743                         return data;
744                 default:
745                         LDNS_FREE(data);
746                         return NULL;
747         }
748 }
749
750 #ifndef S_SPLINT_S
751 ldns_rdf *
752 ldns_sockaddr_storage2rdf(struct sockaddr_storage *sock, uint16_t *port)
753 {
754         ldns_rdf *addr;
755         struct sockaddr_in *data_in;
756         struct sockaddr_in6 *data_in6;
757
758         switch(sock->ss_family) {
759                 case AF_INET:
760                         data_in = (struct sockaddr_in*)sock;
761                         if (port) {
762                                 *port = ntohs((uint16_t)data_in->sin_port);
763                         }
764                         addr = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_A,
765                                         LDNS_IP4ADDRLEN, &data_in->sin_addr);
766                         break;
767                 case AF_INET6:
768                         data_in6 = (struct sockaddr_in6*)sock;
769                         if (port) {
770                                 *port = ntohs((uint16_t)data_in6->sin6_port);
771                         }
772                         addr = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_AAAA,
773                                         LDNS_IP6ADDRLEN, &data_in6->sin6_addr);
774                         break;
775                 default:
776                         if (port) {
777                                 *port = 0;
778                         }
779                         return NULL;
780         }
781         return addr;
782 }
783 #endif
784
785 /* code from resolver.c */
786 ldns_status
787 ldns_axfr_start(ldns_resolver *resolver, ldns_rdf *domain, ldns_rr_class class) 
788 {
789         ldns_pkt *query;
790         ldns_buffer *query_wire;
791
792         struct sockaddr_storage *ns = NULL;
793         size_t ns_len = 0;
794         size_t ns_i;
795         ldns_status status;
796
797         if (!resolver || ldns_resolver_nameserver_count(resolver) < 1) {
798                 return LDNS_STATUS_ERR;
799         }
800
801         query = ldns_pkt_query_new(ldns_rdf_clone(domain), LDNS_RR_TYPE_AXFR, class, 0);
802
803         if (!query) {
804                 return LDNS_STATUS_ADDRESS_ERR;
805         }
806         /* For AXFR, we have to make the connection ourselves */
807         /* try all nameservers (which usually would mean v4 fallback if
808          * @hostname is used */
809         for (ns_i = 0;
810              ns_i < ldns_resolver_nameserver_count(resolver) &&
811              resolver->_socket == 0;
812              ns_i++) {
813                 if (ns != NULL) {
814                         LDNS_FREE(ns);
815                 }
816                 ns = ldns_rdf2native_sockaddr_storage(
817                         resolver->_nameservers[ns_i],
818                         ldns_resolver_port(resolver), &ns_len);
819
820                 resolver->_socket = ldns_tcp_connect(ns, (socklen_t)ns_len,
821                                 ldns_resolver_timeout(resolver));
822         }
823
824         if (resolver->_socket == 0) {
825                 ldns_pkt_free(query);
826                 LDNS_FREE(ns);
827                 return LDNS_STATUS_NETWORK_ERR;
828         }
829
830 #ifdef HAVE_SSL
831         if (ldns_resolver_tsig_keyname(resolver) && ldns_resolver_tsig_keydata(resolver)) {
832                 status = ldns_pkt_tsig_sign(query,
833                                             ldns_resolver_tsig_keyname(resolver),
834                                             ldns_resolver_tsig_keydata(resolver),
835                                             300, ldns_resolver_tsig_algorithm(resolver), NULL);
836                 if (status != LDNS_STATUS_OK) {
837                         /* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
838                            we have to close the socket here! */
839 #ifndef USE_WINSOCK
840                         close(resolver->_socket);
841 #else
842                         closesocket(resolver->_socket);
843 #endif
844                         resolver->_socket = 0;
845
846                         ldns_pkt_free(query);
847                         LDNS_FREE(ns);
848
849                         return LDNS_STATUS_CRYPTO_TSIG_ERR;
850                 }
851         }
852 #endif /* HAVE_SSL */
853
854         /* Convert the query to a buffer
855          * Is this necessary?
856          */
857         query_wire = ldns_buffer_new(LDNS_MAX_PACKETLEN);
858         if(!query_wire) {
859                 ldns_pkt_free(query);
860                 LDNS_FREE(ns);
861 #ifndef USE_WINSOCK
862                 close(resolver->_socket);
863 #else
864                 closesocket(resolver->_socket);
865 #endif
866                 resolver->_socket = 0;
867
868                 return LDNS_STATUS_MEM_ERR;
869         }
870         status = ldns_pkt2buffer_wire(query_wire, query);
871         if (status != LDNS_STATUS_OK) {
872                 ldns_pkt_free(query);
873                 ldns_buffer_free(query_wire);
874                 LDNS_FREE(ns);
875
876                 /* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
877                     we have to close the socket here! */
878 #ifndef USE_WINSOCK
879                 close(resolver->_socket);
880 #else
881                 closesocket(resolver->_socket);
882 #endif
883                 resolver->_socket = 0;
884
885                 return status;
886         }
887         /* Send the query */
888         if (ldns_tcp_send_query(query_wire, resolver->_socket, ns,
889                                 (socklen_t)ns_len) == 0) {
890                 ldns_pkt_free(query);
891                 ldns_buffer_free(query_wire);
892                 LDNS_FREE(ns);
893
894                 /* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
895                          we have to close the socket here! */
896
897 #ifndef USE_WINSOCK
898                 close(resolver->_socket);
899 #else
900                 closesocket(resolver->_socket);
901 #endif
902                 resolver->_socket = 0;
903
904                 return LDNS_STATUS_NETWORK_ERR;
905         }
906
907         ldns_pkt_free(query);
908         ldns_buffer_free(query_wire);
909         LDNS_FREE(ns);
910
911         /*
912          * The AXFR is done once the second SOA record is sent
913          */
914         resolver->_axfr_soa_count = 0;
915         return LDNS_STATUS_OK;
916 }