summaryrefslogtreecommitdiff
path: root/resolv/res_send.c
blob: ca3e6308681d3120c5d68380511a012b508d6872 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
/*
 * Copyright (c) 1985, 1989, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_send.c	8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixie Exp $";
#endif /* LIBC_SCCS and not lint */

/*
 * Send query to name server and wait for reply.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/poll.h>

#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>

#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <resolv.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#if PACKETSZ > 65536
#define MAXPACKET       PACKETSZ
#else
#define MAXPACKET       65536
#endif


/* From ev_streams.c.  */

static inline void
__attribute ((always_inline))
evConsIovec(void *buf, size_t cnt, struct iovec *vec) {
	memset(vec, 0xf5, sizeof (*vec));
	vec->iov_base = buf;
	vec->iov_len = cnt;
}

/* From ev_timers.c.  */

#define BILLION 1000000000

static inline void
evConsTime(struct timespec *res, time_t sec, long nsec) {
	res->tv_sec = sec;
	res->tv_nsec = nsec;
}

static inline void
evAddTime(struct timespec *res, const struct timespec *addend1,
	  const struct timespec *addend2) {
	res->tv_sec = addend1->tv_sec + addend2->tv_sec;
	res->tv_nsec = addend1->tv_nsec + addend2->tv_nsec;
	if (res->tv_nsec >= BILLION) {
		res->tv_sec++;
		res->tv_nsec -= BILLION;
	}
}

static inline void
evSubTime(struct timespec *res, const struct timespec *minuend,
	  const struct timespec *subtrahend) {
       res->tv_sec = minuend->tv_sec - subtrahend->tv_sec;
	if (minuend->tv_nsec >= subtrahend->tv_nsec)
		res->tv_nsec = minuend->tv_nsec - subtrahend->tv_nsec;
	else {
		res->tv_nsec = (BILLION
				- subtrahend->tv_nsec + minuend->tv_nsec);
		res->tv_sec--;
	}
}

static inline int
evCmpTime(struct timespec a, struct timespec b) {
	long x = a.tv_sec - b.tv_sec;

	if (x == 0L)
		x = a.tv_nsec - b.tv_nsec;
	return (x < 0L ? (-1) : x > 0L ? (1) : (0));
}

static inline void
evNowTime(struct timespec *res) {
	struct timeval now;

	if (gettimeofday(&now, NULL) < 0)
		evConsTime(res, 0, 0);
	else
		TIMEVAL_TO_TIMESPEC (&now, res);
}


/* Options.  Leave them on. */
/* #undef DEBUG */
#include "res_debug.h"

#define EXT(res) ((res)->_u._ext)

/* Forward. */

static int		send_vc(res_state, const u_char *, int,
				u_char **, int *, int *, int, u_char **);
static int		send_dg(res_state, const u_char *, int,
				u_char **, int *, int *, int,
				int *, int *, u_char **);
#ifdef DEBUG
static void		Aerror(const res_state, FILE *, const char *, int,
			       const struct sockaddr *);
static void		Perror(const res_state, FILE *, const char *, int);
#endif
static int		sock_eq(struct sockaddr_in6 *, struct sockaddr_in6 *);

/* Reachover. */

static void convaddr4to6(struct sockaddr_in6 *sa);
void res_pquery(const res_state, const u_char *, int, FILE *);

/* Public. */

/* int
 * res_isourserver(ina)
 *	looks up "ina" in _res.ns_addr_list[]
 * returns:
 *	0  : not found
 *	>0 : found
 * author:
 *	paul vixie, 29may94
 */
int
res_ourserver_p(const res_state statp, const struct sockaddr_in6 *inp)
{
	int ns;

        if (inp->sin6_family == AF_INET) {
            struct sockaddr_in *in4p = (struct sockaddr_in *) inp;
	    in_port_t port = in4p->sin_port;
	    in_addr_t addr = in4p->sin_addr.s_addr;

            for (ns = 0;  ns < MAXNS;  ns++) {
                const struct sockaddr_in *srv =
		    (struct sockaddr_in *)EXT(statp).nsaddrs[ns];

                if ((srv != NULL) && (srv->sin_family == AF_INET) &&
                    (srv->sin_port == port) &&
                    (srv->sin_addr.s_addr == INADDR_ANY ||
                     srv->sin_addr.s_addr == addr))
                    return (1);
            }
        } else if (inp->sin6_family == AF_INET6) {
            for (ns = 0;  ns < MAXNS;  ns++) {
                const struct sockaddr_in6 *srv = EXT(statp).nsaddrs[ns];
                if ((srv != NULL) && (srv->sin6_family == AF_INET6) &&
                    (srv->sin6_port == inp->sin6_port) &&
                    !(memcmp(&srv->sin6_addr, &in6addr_any,
                             sizeof (struct in6_addr)) &&
                      memcmp(&srv->sin6_addr, &inp->sin6_addr,
                             sizeof (struct in6_addr))))
                    return (1);
            }
        }
	return (0);
}

/* int
 * res_nameinquery(name, type, class, buf, eom)
 *	look for (name,type,class) in the query section of packet (buf,eom)
 * requires:
 *	buf + HFIXEDSZ <= eom
 * returns:
 *	-1 : format error
 *	0  : not found
 *	>0 : found
 * author:
 *	paul vixie, 29may94
 */
int
res_nameinquery(const char *name, int type, int class,
		const u_char *buf, const u_char *eom)
{
	const u_char *cp = buf + HFIXEDSZ;
	int qdcount = ntohs(((HEADER*)buf)->qdcount);

	while (qdcount-- > 0) {
		char tname[MAXDNAME+1];
		int n, ttype, tclass;

		n = dn_expand(buf, eom, cp, tname, sizeof tname);
		if (n < 0)
			return (-1);
		cp += n;
		if (cp + 2 * INT16SZ > eom)
			return (-1);
		ttype = ns_get16(cp); cp += INT16SZ;
		tclass = ns_get16(cp); cp += INT16SZ;
		if (ttype == type && tclass == class &&
		    ns_samename(tname, name) == 1)
			return (1);
	}
	return (0);
}
libresolv_hidden_def (res_nameinquery)

/* int
 * res_queriesmatch(buf1, eom1, buf2, eom2)
 *	is there a 1:1 mapping of (name,type,class)
 *	in (buf1,eom1) and (buf2,eom2)?
 * returns:
 *	-1 : format error
 *	0  : not a 1:1 mapping
 *	>0 : is a 1:1 mapping
 * author:
 *	paul vixie, 29may94
 */
int
res_queriesmatch(const u_char *buf1, const u_char *eom1,
		 const u_char *buf2, const u_char *eom2)
{
	const u_char *cp = buf1 + HFIXEDSZ;
	int qdcount = ntohs(((HEADER*)buf1)->qdcount);

	if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
		return (-1);

	/*
	 * Only header section present in replies to
	 * dynamic update packets.
	 */
	if ((((HEADER *)buf1)->opcode == ns_o_update) &&
	    (((HEADER *)buf2)->opcode == ns_o_update))
		return (1);

	if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
		return (0);
	while (qdcount-- > 0) {
		char tname[MAXDNAME+1];
		int n, ttype, tclass;

		n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
		if (n < 0)
			return (-1);
		cp += n;
		if (cp + 2 * INT16SZ > eom1)
			return (-1);
		ttype = ns_get16(cp);	cp += INT16SZ;
		tclass = ns_get16(cp); cp += INT16SZ;
		if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
			return (0);
	}
	return (1);
}
libresolv_hidden_def (res_queriesmatch)

int
__libc_res_nsend(res_state statp, const u_char *buf, int buflen,
		 u_char *ans, int anssiz, u_char **ansp)
{
	int gotsomewhere, terrno, try, v_circuit, resplen, ns, n;

	if (statp->nscount == 0) {
		__set_errno (ESRCH);
		return (-1);
	}

	if (anssiz < HFIXEDSZ) {
		__set_errno (EINVAL);
		return (-1);
	}

	if ((statp->qhook || statp->rhook) && anssiz < MAXPACKET && ansp) {
		u_char *buf = malloc (MAXPACKET);
		if (buf == NULL)
			return (-1);
		memcpy (buf, ans, HFIXEDSZ);
		*ansp = buf;
		ans = buf;
		anssiz = MAXPACKET;
	}

	DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
		(stdout, ";; res_send()\n"), buf, buflen);
	v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
	gotsomewhere = 0;
	terrno = ETIMEDOUT;

	/*
	 * If the ns_addr_list in the resolver context has changed, then
	 * invalidate our cached copy and the associated timing data.
	 */
	if (EXT(statp).nsinit) {
		int needclose = 0;

		if (EXT(statp).nscount != statp->nscount)
			needclose++;
		else
			for (ns = 0; ns < MAXNS; ns++) {
				unsigned int map = EXT(statp).nsmap[ns];
				if (map < MAXNS
				    && !sock_eq((struct sockaddr_in6 *)
						&statp->nsaddr_list[map],
						EXT(statp).nsaddrs[ns]))
				{
					needclose++;
					break;
				}
			}
		if (needclose)
			res_nclose(statp);
	}

	/*
	 * Maybe initialize our private copy of the ns_addr_list.
	 */
	if (EXT(statp).nsinit == 0) {
		unsigned char map[MAXNS];

		memset (map, MAXNS, sizeof (map));
		for (n = 0; n < MAXNS; n++) {
			ns = EXT(statp).nsmap[n];
			if (ns < statp->nscount)
				map[ns] = n;
			else if (ns < MAXNS) {
				free(EXT(statp).nsaddrs[n]);
				EXT(statp).nsaddrs[n] = NULL;
				EXT(statp).nsmap[n] = MAXNS;
			}
		}
		n = statp->nscount;
		if (statp->nscount > EXT(statp).nscount)
			for (n = EXT(statp).nscount, ns = 0;
			     n < statp->nscount; n++) {
				while (ns < MAXNS
				       && EXT(statp).nsmap[ns] != MAXNS)
					ns++;
				if (ns == MAXNS)
					break;
				EXT(statp).nsmap[ns] = n;
				map[n] = ns++;
			}
		EXT(statp).nscount = n;
		for (ns = 0; ns < EXT(statp).nscount; ns++) {
			n = map[ns];
			if (EXT(statp).nsaddrs[n] == NULL)
				EXT(statp).nsaddrs[n] =
				    malloc(sizeof (struct sockaddr_in6));
			if (EXT(statp).nsaddrs[n] != NULL) {
				memcpy(EXT(statp).nsaddrs[n],
				       &statp->nsaddr_list[ns],
				       sizeof (struct sockaddr_in));
				EXT(statp).nssocks[n] = -1;
				n++;
			}
		}
		EXT(statp).nsinit = 1;
	}

	/*
	 * Some resolvers want to even out the load on their nameservers.
	 * Note that RES_BLAST overrides RES_ROTATE.
	 */
	if ((statp->options & RES_ROTATE) != 0 &&
	    (statp->options & RES_BLAST) == 0) {
		struct sockaddr_in6 *ina;
		unsigned int map;

		n = 0;
		while (n < MAXNS && EXT(statp).nsmap[n] == MAXNS)
			n++;
		if (n < MAXNS) {
			ina = EXT(statp).nsaddrs[n];
			map = EXT(statp).nsmap[n];
			for (;;) {
				ns = n + 1;
				while (ns < MAXNS
				       && EXT(statp).nsmap[ns] == MAXNS)
					ns++;
				if (ns == MAXNS)
					break;
				EXT(statp).nsaddrs[n] = EXT(statp).nsaddrs[ns];
				EXT(statp).nsmap[n] = EXT(statp).nsmap[ns];
				n = ns;
			}
			EXT(statp).nsaddrs[n] = ina;
			EXT(statp).nsmap[n] = map;
		}
	}

	/*
	 * Send request, RETRY times, or until successful.
	 */
	for (try = 0; try < statp->retry; try++) {
	    for (ns = 0; ns < MAXNS; ns++)
	    {
		struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];

		if (nsap == NULL)
			goto next_ns;
 same_ns:
		if (statp->qhook) {
			int done = 0, loops = 0;

			do {
				res_sendhookact act;

				struct sockaddr_in *nsap4;
				nsap4 = (struct sockaddr_in *) nsap;
				act = (*statp->qhook)(&nsap4, &buf, &buflen,
						      ans, anssiz, &resplen);
				nsap = (struct sockaddr_in6 *) nsap4;
				switch (act) {
				case res_goahead:
					done = 1;
					break;
				case res_nextns:
					res_nclose(statp);
					goto next_ns;
				case res_done:
					return (resplen);
				case res_modified:
					/* give the hook another try */
					if (++loops < 42) /*doug adams*/
						break;
					/*FALLTHROUGH*/
				case res_error:
					/*FALLTHROUGH*/
				default:
					return (-1);
				}
			} while (!done);
		}

#ifdef DEBUG
		char tmpbuf[40];
#endif
		Dprint(statp->options & RES_DEBUG,
		       (stdout, ";; Querying server (# %d) address = %s\n",
			ns + 1, inet_ntop(AF_INET6, &nsap->sin6_addr,
					  tmpbuf, sizeof (tmpbuf))));

		if (v_circuit) {
			/* Use VC; at most one attempt per server. */
			try = statp->retry;
			n = send_vc(statp, buf, buflen, &ans, &anssiz, &terrno,
				    ns, ansp);
			if (n < 0)
				return (-1);
			if (n == 0)
				goto next_ns;
			resplen = n;
		} else {
			/* Use datagrams. */
			n = send_dg(statp, buf, buflen, &ans, &anssiz, &terrno,
				    ns, &v_circuit, &gotsomewhere, ansp);
			if (n < 0)
				return (-1);
			if (n == 0)
				goto next_ns;
			if (v_circuit)
				goto same_ns;
			resplen = n;
		}

		Dprint((statp->options & RES_DEBUG) ||
		       ((statp->pfcode & RES_PRF_REPLY) &&
			(statp->pfcode & RES_PRF_HEAD1)),
		       (stdout, ";; got answer:\n"));

		DprintQ((statp->options & RES_DEBUG) ||
			(statp->pfcode & RES_PRF_REPLY),
			(stdout, "%s", ""),
			ans, (resplen > anssiz) ? anssiz : resplen);

		/*
		 * If we have temporarily opened a virtual circuit,
		 * or if we haven't been asked to keep a socket open,
		 * close the socket.
		 */
		if ((v_circuit && (statp->options & RES_USEVC) == 0) ||
		    (statp->options & RES_STAYOPEN) == 0) {
			res_nclose(statp);
		}
		if (statp->rhook) {
			int done = 0, loops = 0;

			do {
				res_sendhookact act;

				act = (*statp->rhook)((struct sockaddr_in *)
						      nsap, buf, buflen,
						      ans, anssiz, &resplen);
				switch (act) {
				case res_goahead:
				case res_done:
					done = 1;
					break;
				case res_nextns:
					res_nclose(statp);
					goto next_ns;
				case res_modified:
					/* give the hook another try */
					if (++loops < 42) /*doug adams*/
						break;
					/*FALLTHROUGH*/
				case res_error:
					/*FALLTHROUGH*/
				default:
					return (-1);
				}
			} while (!done);

		}
		return (resplen);
 next_ns: ;
	   } /*foreach ns*/
	} /*foreach retry*/
	res_nclose(statp);
	if (!v_circuit) {
		if (!gotsomewhere)
			__set_errno (ECONNREFUSED);	/* no nameservers found */
		else
			__set_errno (ETIMEDOUT);	/* no answer obtained */
	} else
		__set_errno (terrno);
	return (-1);
}

int
res_nsend(res_state statp,
	  const u_char *buf, int buflen, u_char *ans, int anssiz)
{
	return __libc_res_nsend(statp, buf, buflen, ans, anssiz, NULL);
}
libresolv_hidden_def (res_nsend)

/* Private */

static int
send_vc(res_state statp,
	const u_char *buf, int buflen, u_char **ansp, int *anssizp,
	int *terrno, int ns, u_char **anscp)
{
	const HEADER *hp = (HEADER *) buf;
	u_char *ans = *ansp;
	int anssiz = *anssizp;
	HEADER *anhp = (HEADER *) ans;
	struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
	int truncating, connreset, resplen, n;
	struct iovec iov[2];
	u_short len;
	u_char *cp;

	connreset = 0;
 same_ns:
	truncating = 0;

	/* Are we still talking to whom we want to talk to? */
	if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
		struct sockaddr_in6 peer;
		int size = sizeof peer;

		if (getpeername(statp->_vcsock,
				(struct sockaddr *)&peer, &size) < 0 ||
		    !sock_eq(&peer, nsap)) {
			res_nclose(statp);
			statp->_flags &= ~RES_F_VC;
		}
	}

	if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
		if (statp->_vcsock >= 0)
			res_nclose(statp);

		statp->_vcsock = socket(nsap->sin6_family, SOCK_STREAM, 0);
		if (statp->_vcsock < 0) {
			*terrno = errno;
			Perror(statp, stderr, "socket(vc)", errno);
			return (-1);
		}
		__set_errno (0);
		if (connect(statp->_vcsock, (struct sockaddr *)nsap,
			    sizeof *nsap) < 0) {
			*terrno = errno;
			Aerror(statp, stderr, "connect/vc", errno,
			       (struct sockaddr *) nsap);
			res_nclose(statp);
			return (0);
		}
		statp->_flags |= RES_F_VC;
	}

	/*
	 * Send length & message
	 */
	putshort((u_short)buflen, (u_char*)&len);
	evConsIovec(&len, INT16SZ, &iov[0]);
	evConsIovec((void*)buf, buflen, &iov[1]);
	if (TEMP_FAILURE_RETRY (writev(statp->_vcsock, iov, 2))
	    != (INT16SZ + buflen)) {
		*terrno = errno;
		Perror(statp, stderr, "write failed", errno);
		res_nclose(statp);
		return (0);
	}
	/*
	 * Receive length & response
	 */
 read_len:
	cp = ans;
	len = INT16SZ;
	while ((n = TEMP_FAILURE_RETRY (read(statp->_vcsock, (char *)cp,
					     (int)len))) > 0) {
		cp += n;
		if ((len -= n) <= 0)
			break;
	}
	if (n <= 0) {
		*terrno = errno;
		Perror(statp, stderr, "read failed", errno);
		res_nclose(statp);
		/*
		 * A long running process might get its TCP
		 * connection reset if the remote server was
		 * restarted.  Requery the server instead of
		 * trying a new one.  When there is only one
		 * server, this means that a query might work
		 * instead of failing.  We only allow one reset
		 * per query to prevent looping.
		 */
		if (*terrno == ECONNRESET && !connreset) {
			connreset = 1;
			res_nclose(statp);
			goto same_ns;
		}
		res_nclose(statp);
		return (0);
	}
	resplen = ns_get16(ans);
	if (resplen > anssiz) {
		if (anscp) {
			ans = malloc (MAXPACKET);
			if (ans == NULL) {
				*terrno = ENOMEM;
				res_nclose(statp);
				return (0);
			}
			anssiz = MAXPACKET;
			*anssizp = MAXPACKET;
			*ansp = ans;
			*anscp = ans;
			anhp = (HEADER *) ans;
			len = resplen;
		} else {
			Dprint(statp->options & RES_DEBUG,
				(stdout, ";; response truncated\n")
			);
			truncating = 1;
			len = anssiz;
		}
	} else
		len = resplen;
	if (len < HFIXEDSZ) {
		/*
		 * Undersized message.
		 */
		Dprint(statp->options & RES_DEBUG,
		       (stdout, ";; undersized: %d\n", len));
		*terrno = EMSGSIZE;
		res_nclose(statp);
		return (0);
	}
	cp = ans;
	while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (int)len)) > 0){
		cp += n;
		len -= n;
	}
	if (n <= 0) {
		*terrno = errno;
		Perror(statp, stderr, "read(vc)", errno);
		res_nclose(statp);
		return (0);
	}
	if (truncating) {
		/*
		 * Flush rest of answer so connection stays in synch.
		 */
		anhp->tc = 1;
		len = resplen - anssiz;
		while (len != 0) {
			char junk[PACKETSZ];

			n = read(statp->_vcsock, junk,
				 (len > sizeof junk) ? sizeof junk : len);
			if (n > 0)
				len -= n;
			else
				break;
		}
	}
	/*
	 * If the calling applicating has bailed out of
	 * a previous call and failed to arrange to have
	 * the circuit closed or the server has got
	 * itself confused, then drop the packet and
	 * wait for the correct one.
	 */
	if (hp->id != anhp->id) {
		DprintQ((statp->options & RES_DEBUG) ||
			(statp->pfcode & RES_PRF_REPLY),
			(stdout, ";; old answer (unexpected):\n"),
			ans, (resplen > anssiz) ? anssiz: resplen);
		goto read_len;
	}

	/*
	 * All is well, or the error is fatal.  Signal that the
	 * next nameserver ought not be tried.
	 */
	return (resplen);
}

static int
send_dg(res_state statp,
	const u_char *buf, int buflen, u_char **ansp, int *anssizp,
	int *terrno, int ns, int *v_circuit, int *gotsomewhere, u_char **anscp)
{
	const HEADER *hp = (HEADER *) buf;
	u_char *ans = *ansp;
	int anssiz = *anssizp;
	HEADER *anhp = (HEADER *) ans;
	struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
	struct timespec now, timeout, finish;
	struct pollfd pfd[1];
        int ptimeout;
	struct sockaddr_in6 from;
	static int socket_pf = 0;
	int fromlen, resplen, seconds, n, s;

	if (EXT(statp).nssocks[ns] == -1) {
		/* only try IPv6 if IPv6 NS and if not failed before */
		if ((EXT(statp).nscount6 > 0) && (socket_pf != PF_INET)) {
			EXT(statp).nssocks[ns] =
			    socket(PF_INET6, SOCK_DGRAM, 0);
			socket_pf = EXT(statp).nssocks[ns] < 0 ? PF_INET
			                                       : PF_INET6;
		}
		if (EXT(statp).nssocks[ns] < 0)
			EXT(statp).nssocks[ns] = socket(PF_INET, SOCK_DGRAM, 0);
		if (EXT(statp).nssocks[ns] < 0) {
			*terrno = errno;
			Perror(statp, stderr, "socket(dg)", errno);
			return (-1);
		}
		/* If IPv6 socket and nsap is IPv4, make it IPv4-mapped */
		if ((socket_pf == PF_INET6) && (nsap->sin6_family == AF_INET))
			convaddr4to6(nsap);
		/*
		 * On a 4.3BSD+ machine (client and server,
		 * actually), sending to a nameserver datagram
		 * port with no nameserver will cause an
		 * ICMP port unreachable message to be returned.
		 * If our datagram socket is "connected" to the
		 * server, we get an ECONNREFUSED error on the next
		 * socket operation, and select returns if the
		 * error message is received.  We can thus detect
		 * the absence of a nameserver without timing out.
		 */
		if (connect(EXT(statp).nssocks[ns], (struct sockaddr *)nsap,
			    sizeof *nsap) < 0) {
			Aerror(statp, stderr, "connect(dg)", errno,
			       (struct sockaddr *) nsap);
			res_nclose(statp);
			return (0);
		}
		/* Make socket non-blocking.  */
		int fl = __fcntl (EXT(statp).nssocks[ns], F_GETFL);
		if  (fl != -1)
			__fcntl (EXT(statp).nssocks[ns], F_SETFL,
				 fl | O_NONBLOCK);
		Dprint(statp->options & RES_DEBUG,
		       (stdout, ";; new DG socket\n"))
	}
	s = EXT(statp).nssocks[ns];
	/*
	 * Compute time for the total operation.
	 */
	seconds = (statp->retrans << ns);
	if (ns > 0)
		seconds /= statp->nscount;
	if (seconds <= 0)
		seconds = 1;
	evNowTime(&now);
	evConsTime(&timeout, seconds, 0);
	evAddTime(&finish, &now, &timeout);
	int need_recompute = 0;
 resend:
        /* Convert struct timespec in milliseconds.  */
	ptimeout = timeout.tv_sec * 1000 + timeout.tv_nsec / 1000000;

	pfd[0].fd = s;
	pfd[0].events = POLLOUT;
	n = __poll (pfd, 1, 0);
	if (__builtin_expect (n == 0, 0)) {
		n = __poll (pfd, 1, ptimeout);
		need_recompute = 1;
	}
	if (n == 0) {
		Dprint(statp->options & RES_DEBUG, (stdout,
						    ";; timeout sending\n"));
		*gotsomewhere = 1;
		return (0);
	}
	if (n < 0) {
		if (errno == EINTR) {
		recompute_resend:
			evNowTime(&now);
			if (evCmpTime(finish, now) > 0) {
				evSubTime(&timeout, &finish, &now);
				goto resend;
			}
		}
		Perror(statp, stderr, "select", errno);
		res_nclose(statp);
		return (0);
	}
	__set_errno (0);
	if (send(s, (char*)buf, buflen, 0) != buflen) {
		if (errno == EINTR || errno == EAGAIN)
			goto recompute_resend;
		Perror(statp, stderr, "send", errno);
		res_nclose(statp);
		return (0);
	}

 wait:
	if (need_recompute) {
		evNowTime(&now);
		if (evCmpTime(finish, now) <= 0) {
		err_return:
			Perror(statp, stderr, "select", errno);
			res_nclose(statp);
			return (0);
		}
		evSubTime(&timeout, &finish, &now);
	}
        /* Convert struct timespec in milliseconds.  */
	ptimeout = timeout.tv_sec * 1000 + timeout.tv_nsec / 1000000;

	pfd[0].events = POLLIN;
	n = __poll (pfd, 1, ptimeout);
	if (n == 0) {
		Dprint(statp->options & RES_DEBUG, (stdout,
						    ";; timeout receiving\n"));
		*gotsomewhere = 1;
		return (0);
	}
	if (n < 0) {
		if (errno == EINTR) {
			need_recompute = 1;
			goto wait;
		}
		goto err_return;
	}
	__set_errno (0);
	fromlen = sizeof(struct sockaddr_in6);
	if (anssiz < MAXPACKET
	    && anscp
	    && (ioctl (s, FIONREAD, &resplen) < 0
		|| anssiz < resplen)) {
		ans = malloc (MAXPACKET);
		if (ans == NULL)
			ans = *ansp;
		else {
			anssiz = MAXPACKET;
			*anssizp = MAXPACKET;
			*ansp = ans;
			*anscp = ans;
			anhp = (HEADER *) ans;
		}
	}
	resplen = recvfrom(s, (char*)ans, anssiz,0,
			   (struct sockaddr *)&from, &fromlen);
	if (resplen <= 0) {
		if (errno == EINTR || errno == EAGAIN) {
			need_recompute = 1;
			goto wait;
		}
		Perror(statp, stderr, "recvfrom", errno);
		res_nclose(statp);
		return (0);
	}
	*gotsomewhere = 1;
	if (resplen < HFIXEDSZ) {
		/*
		 * Undersized message.
		 */
		Dprint(statp->options & RES_DEBUG,
		       (stdout, ";; undersized: %d\n",
			resplen));
		*terrno = EMSGSIZE;
		res_nclose(statp);
		return (0);
	}
	if (hp->id != anhp->id) {
		/*
		 * response from old query, ignore it.
		 * XXX - potential security hazard could
		 *	 be detected here.
		 */
		DprintQ((statp->options & RES_DEBUG) ||
			(statp->pfcode & RES_PRF_REPLY),
			(stdout, ";; old answer:\n"),
			ans, (resplen > anssiz) ? anssiz : resplen);
		goto wait;
	}
	if (!(statp->options & RES_INSECURE1) &&
	    !res_ourserver_p(statp, &from)) {
		/*
		 * response from wrong server? ignore it.
		 * XXX - potential security hazard could
		 *	 be detected here.
		 */
		DprintQ((statp->options & RES_DEBUG) ||
			(statp->pfcode & RES_PRF_REPLY),
			(stdout, ";; not our server:\n"),
			ans, (resplen > anssiz) ? anssiz : resplen);
		goto wait;
	}
	if (!(statp->options & RES_INSECURE2) &&
	    !res_queriesmatch(buf, buf + buflen,
			      ans, ans + anssiz)) {
		/*
		 * response contains wrong query? ignore it.
		 * XXX - potential security hazard could
		 *	 be detected here.
		 */
		DprintQ((statp->options & RES_DEBUG) ||
			(statp->pfcode & RES_PRF_REPLY),
			(stdout, ";; wrong query name:\n"),
			ans, (resplen > anssiz) ? anssiz : resplen);
		goto wait;
	}
	if (anhp->rcode == SERVFAIL ||
	    anhp->rcode == NOTIMP ||
	    anhp->rcode == REFUSED) {
		DprintQ(statp->options & RES_DEBUG,
			(stdout, "server rejected query:\n"),
			ans, (resplen > anssiz) ? anssiz : resplen);
		res_nclose(statp);
		/* don't retry if called from dig */
		if (!statp->pfcode)
			return (0);
	}
	if (!(statp->options & RES_IGNTC) && anhp->tc) {
		/*
		 * To get the rest of answer,
		 * use TCP with same server.
		 */
		Dprint(statp->options & RES_DEBUG,
		       (stdout, ";; truncated answer\n"));
		*v_circuit = 1;
		res_nclose(statp);
		return (1);
	}
	/*
	 * All is well, or the error is fatal.  Signal that the
	 * next nameserver ought not be tried.
	 */
	return (resplen);
}

#ifdef DEBUG
static void
Aerror(const res_state statp, FILE *file, const char *string, int error,
       const struct sockaddr *address)
{
	int save = errno;

	if ((statp->options & RES_DEBUG) != 0) {
		char tmp[sizeof "xxxx.xxxx.xxxx.255.255.255.255"];

		fprintf(file, "res_send: %s ([%s].%u): %s\n",
			string,
			inet_ntop(address->sa_family, address->sa_data,
				  tmp, sizeof tmp),
			(address->sa_family == AF_INET
			 ? ntohs(((struct sockaddr_in *) address)->sin_port)
			 : address->sa_family == AF_INET6
			 ? ntohs(((struct sockaddr_in6 *) address)->sin6_port)
			 : 0),
			strerror(error));
	}
	__set_errno (save);
}

static void
Perror(const res_state statp, FILE *file, const char *string, int error) {
	int save = errno;

	if ((statp->options & RES_DEBUG) != 0)
		fprintf(file, "res_send: %s: %s\n",
			string, strerror(error));
	__set_errno (save);
}
#endif

static int
sock_eq(struct sockaddr_in6 *a1, struct sockaddr_in6 *a2) {
	if (a1->sin6_family == a2->sin6_family) {
		if (a1->sin6_family == AF_INET)
			return ((((struct sockaddr_in *)a1)->sin_port ==
				 ((struct sockaddr_in *)a2)->sin_port) &&
				(((struct sockaddr_in *)a1)->sin_addr.s_addr ==
				 ((struct sockaddr_in *)a2)->sin_addr.s_addr));
		else
			return ((a1->sin6_port == a2->sin6_port) &&
				!memcmp(&a1->sin6_addr, &a2->sin6_addr,
					sizeof (struct in6_addr)));
	}
	if (a1->sin6_family == AF_INET) {
		struct sockaddr_in6 *sap = a1;
		a1 = a2;
		a2 = sap;
	} /* assumes that AF_INET and AF_INET6 are the only possibilities */
	return ((a1->sin6_port == ((struct sockaddr_in *)a2)->sin_port) &&
		IN6_IS_ADDR_V4MAPPED(&a1->sin6_addr) &&
		(a1->sin6_addr.s6_addr32[3] ==
		 ((struct sockaddr_in *)a2)->sin_addr.s_addr));
}

/*
 * Converts IPv4 family, address and port to
 * IPv6 family, IPv4-mapped IPv6 address and port.
 */
static void
convaddr4to6(struct sockaddr_in6 *sa)
{
    struct sockaddr_in *sa4p = (struct sockaddr_in *) sa;
    in_port_t port = sa4p->sin_port;
    in_addr_t addr = sa4p->sin_addr.s_addr;

    sa->sin6_family = AF_INET6;
    sa->sin6_port = port;
    sa->sin6_addr.s6_addr32[0] = 0;
    sa->sin6_addr.s6_addr32[1] = 0;
    sa->sin6_addr.s6_addr32[2] = htonl(0xFFFF);
    sa->sin6_addr.s6_addr32[3] = addr;
}