File: res_debug.c

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: buster, experimental, sid
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (1098 lines) | stat: -rw-r--r-- 30,496 bytes parent folder | download | duplicates (4)
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
/*
 * Copyright (c) 1985
 *    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) 1995 by International Business Machines, Inc.
 *
 * International Business Machines, Inc. (hereinafter called IBM) grants
 * permission under its copyrights to use, copy, modify, and distribute this
 * Software with or without fee, provided that the above copyright notice and
 * all paragraphs of this notice appear in all copies, and that the name of IBM
 * not be used in connection with the marketing of any product incorporating
 * the Software or modifications thereof, without specific, written prior
 * permission.
 *
 * To the extent it has a right to do so, IBM grants an immunity from suit
 * under its patents, if any, for the use, sale or manufacture of products to
 * the extent that such products are used for performing Domain Name System
 * dynamic updates in TCP/IP networks by means of the Software.  No immunity is
 * granted for any product per se or for any other function of any product.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE.  IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
 * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
 * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
 */

/*
 * 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.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

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

#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <netdb.h>
#include <resolv/resolv-internal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <shlib-compat.h>
#include <libc-diag.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) sprintf x
#endif

extern const char *_res_sectioncodes[] attribute_hidden;

/* _res_opcodes was exported by accident as a variable.  */
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
static const char *res_opcodes[] =
#else
static const char res_opcodes[][9] =
#endif
  {
    "QUERY",
    "IQUERY",
    "CQUERYM",
    "CQUERYU",	/* experimental */
    "NOTIFY",	/* experimental */
    "UPDATE",
    "6",
    "7",
    "8",
    "9",
    "10",
    "11",
    "12",
    "13",
    "ZONEINIT",
    "ZONEREF",
  };
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
strong_alias (res_opcodes, _res_opcodes)
#endif

static const char *p_section(int section, int opcode);

/*
 * Print the current options.
 */
void
fp_resstat(const res_state statp, FILE *file) {
	u_long mask;

	fprintf(file, ";; res options:");
	for (mask = 1;  mask != 0;  mask <<= 1)
		if (statp->options & mask)
			fprintf(file, " %s", p_option(mask));
	putc('\n', file);
}

static void
do_section (int pfcode, ns_msg *handle, ns_sect section, int pflag, FILE *file)
{
	int n, sflag, rrnum;
	static int buflen = 2048;
	char *buf;
	ns_opcode opcode;
	ns_rr rr;

	/*
	 * Print answer records.
	 */
	sflag = (pfcode & pflag);
	if (pfcode && !sflag)
		return;

	buf = malloc(buflen);
	if (buf == NULL) {
		fprintf(file, ";; memory allocation failure\n");
		return;
	}

	opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
	rrnum = 0;
	for (;;) {
		if (ns_parserr(handle, section, rrnum, &rr)) {
			if (errno != ENODEV)
				fprintf(file, ";; ns_parserr: %s\n",
					strerror(errno));
			else if (rrnum > 0 && sflag != 0 &&
				 (pfcode & RES_PRF_HEAD1))
				putc('\n', file);
			goto cleanup;
		}
		if (rrnum == 0 && sflag != 0 && (pfcode & RES_PRF_HEAD1))
			fprintf(file, ";; %s SECTION:\n",
				p_section(section, opcode));
		if (section == ns_s_qd)
			fprintf(file, ";;\t%s, type = %s, class = %s\n",
				ns_rr_name(rr),
				p_type(ns_rr_type(rr)),
				p_class(ns_rr_class(rr)));
		else {
			n = ns_sprintrr(handle, &rr, NULL, NULL,
					buf, buflen);
			if (n < 0) {
				if (errno == ENOSPC) {
					free(buf);
					buf = NULL;
					if (buflen < 131072)
						buf = malloc(buflen += 1024);
					if (buf == NULL) {
						fprintf(file,
					      ";; memory allocation failure\n");
					      return;
					}
					continue;
				}
				fprintf(file, ";; ns_sprintrr: %s\n",
					strerror(errno));
				goto cleanup;
			}
			fputs(buf, file);
			fputc('\n', file);
		}
		rrnum++;
	}
 cleanup:
	free(buf);
}

/*
 * Print the contents of a query.
 * This is intended to be primarily a debugging routine.
 */
void
fp_nquery (const unsigned char *msg, int len, FILE *file)
{
	ns_msg handle;
	int qdcount, ancount, nscount, arcount;
	u_int opcode, rcode, id;

	/* There is no need to initialize _res: If _res is not yet
	   initialized, _res.pfcode is zero.  But initialization will
	   leave it at zero, too.  _res.pfcode is an unsigned long,
	   but the code here assumes that the flags fit into an int,
	   so use that.  */
	int pfcode = _res.pfcode;

	if (ns_initparse(msg, len, &handle) < 0) {
		fprintf(file, ";; ns_initparse: %s\n", strerror(errno));
		return;
	}
	opcode = ns_msg_getflag(handle, ns_f_opcode);
	rcode = ns_msg_getflag(handle, ns_f_rcode);
	id = ns_msg_id(handle);
	qdcount = ns_msg_count(handle, ns_s_qd);
	ancount = ns_msg_count(handle, ns_s_an);
	nscount = ns_msg_count(handle, ns_s_ns);
	arcount = ns_msg_count(handle, ns_s_ar);

	/*
	 * Print header fields.
	 */
	if ((!pfcode) || (pfcode & RES_PRF_HEADX) || rcode)
		fprintf(file,
			";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
			res_opcodes[opcode], p_rcode(rcode), id);
	if ((!pfcode) || (pfcode & RES_PRF_HEADX))
		putc(';', file);
	if ((!pfcode) || (pfcode & RES_PRF_HEAD2)) {
		fprintf(file, "; flags:");
		if (ns_msg_getflag(handle, ns_f_qr))
			fprintf(file, " qr");
		if (ns_msg_getflag(handle, ns_f_aa))
			fprintf(file, " aa");
		if (ns_msg_getflag(handle, ns_f_tc))
			fprintf(file, " tc");
		if (ns_msg_getflag(handle, ns_f_rd))
			fprintf(file, " rd");
		if (ns_msg_getflag(handle, ns_f_ra))
			fprintf(file, " ra");
		if (ns_msg_getflag(handle, ns_f_z))
			fprintf(file, " ??");
		if (ns_msg_getflag(handle, ns_f_ad))
			fprintf(file, " ad");
		if (ns_msg_getflag(handle, ns_f_cd))
			fprintf(file, " cd");
	}
	if ((!pfcode) || (pfcode & RES_PRF_HEAD1)) {
		fprintf(file, "; %s: %d",
			p_section(ns_s_qd, opcode), qdcount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_an, opcode), ancount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_ns, opcode), nscount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_ar, opcode), arcount);
	}
	if ((!pfcode) || (pfcode &
		(RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
		putc('\n',file);
	}
	/*
	 * Print the various sections.
	 */
	do_section (pfcode, &handle, ns_s_qd, RES_PRF_QUES, file);
	do_section (pfcode, &handle, ns_s_an, RES_PRF_ANS, file);
	do_section (pfcode, &handle, ns_s_ns, RES_PRF_AUTH, file);
	do_section (pfcode, &handle, ns_s_ar, RES_PRF_ADD, file);
	if (qdcount == 0 && ancount == 0 &&
	    nscount == 0 && arcount == 0)
		putc('\n', file);
}
libresolv_hidden_def (fp_nquery)

void
fp_query (const unsigned char *msg, FILE *file)
{
  fp_nquery (msg, PACKETSZ, file);
}
libresolv_hidden_def (fp_query)

void
p_query (const unsigned char *msg)
{
  fp_query (msg, stdout);
}

const u_char *
p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {
	char name[MAXDNAME];
	int n;

	if ((n = dn_expand(msg, msg + len, cp, name, sizeof name)) < 0)
		return (NULL);
	if (name[0] == '\0')
		putc('.', file);
	else
		fputs(name, file);
	return (cp + n);
}
libresolv_hidden_def (p_cdnname)

const u_char *
p_cdname(const u_char *cp, const u_char *msg, FILE *file) {
	return (p_cdnname(cp, msg, PACKETSZ, file));
}

/* Return a fully-qualified domain name from a compressed name (with
   length supplied).  */

const u_char *
p_fqnname (const u_char *cp, const u_char *msg, int msglen, char *name,
	   int namelen)
{
	int n, newlen;

	if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
		return (NULL);
	newlen = strlen(name);
	if (newlen == 0 || name[newlen - 1] != '.') {
		if (newlen + 1 >= namelen)	/* Lack space for final dot */
			return (NULL);
		else
			strcpy(name + newlen, ".");
	}
	return (cp + n);
}
libresolv_hidden_def (p_fqnname)

/* XXX:	the rest of these functions need to become length-limited, too. */

const u_char *
p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
	char name[MAXDNAME];
	const u_char *n;

	n = p_fqnname(cp, msg, MAXCDNAME, name, sizeof name);
	if (n == NULL)
		return (NULL);
	fputs(name, file);
	return (n);
}

/*
 * Names of RR classes and qclasses.  Classes and qclasses are the same, except
 * that C_ANY is a qclass but not a class.  (You can ask for records of class
 * C_ANY, but you can't have any records of that class in the database.)
 */
extern const struct res_sym __p_class_syms[];
libresolv_hidden_proto (__p_class_syms)
const struct res_sym __p_class_syms[] = {
  {C_IN,    (char *) "IN"},
  {C_CHAOS, (char *) "CHAOS"},
  {C_HS,    (char *) "HS"},
  {C_HS,    (char *) "HESIOD"},
  {C_ANY,   (char *) "ANY"},
  {C_NONE,  (char *) "NONE"},
  {C_IN, NULL, NULL}
};
libresolv_hidden_data_def (__p_class_syms)

/*
 * Names of message sections.
 */
const struct res_sym __p_default_section_syms[] attribute_hidden = {
  {ns_s_qd, (char *) "QUERY"},
  {ns_s_an, (char *) "ANSWER"},
  {ns_s_ns, (char *) "AUTHORITY"},
  {ns_s_ar, (char *) "ADDITIONAL"},
  {0, NULL, NULL}
};

const struct res_sym __p_update_section_syms[] attribute_hidden = {
  {S_ZONE,   (char *) "ZONE"},
  {S_PREREQ, (char *) "PREREQUISITE"},
  {S_UPDATE, (char *) "UPDATE"},
  {S_ADDT,   (char *) "ADDITIONAL"},
  {0, NULL, NULL}
};

/*
 * Names of RR types and qtypes.  The list is incomplete because its
 * size is part of the ABI.
 */
extern const struct res_sym __p_type_syms[];
libresolv_hidden_proto (__p_type_syms)
const struct res_sym __p_type_syms[] = {
  {ns_t_a,      (char *) "A",     (char *) "address"},
  {ns_t_ns,     (char *) "NS",    (char *) "name server"},
  {ns_t_md,     (char *) "MD",    (char *) "mail destination (deprecated)"},
  {ns_t_mf,     (char *) "MF",    (char *) "mail forwarder (deprecated)"},
  {ns_t_cname,  (char *) "CNAME", (char *) "canonical name"},
  {ns_t_soa,    (char *) "SOA",   (char *) "start of authority"},
  {ns_t_mb,     (char *) "MB",    (char *) "mailbox"},
  {ns_t_mg,     (char *) "MG",    (char *) "mail group member"},
  {ns_t_mr,     (char *) "MR",    (char *) "mail rename"},
  {ns_t_null,   (char *) "NULL",  (char *) "null"},
  {ns_t_wks,    (char *) "WKS",   (char *) "well-known service (deprecated)"},
  {ns_t_ptr,    (char *) "PTR",   (char *) "domain name pointer"},
  {ns_t_hinfo,  (char *) "HINFO", (char *) "host information"},
  {ns_t_minfo,  (char *) "MINFO", (char *) "mailbox information"},
  {ns_t_mx,     (char *) "MX",    (char *) "mail exchanger"},
  {ns_t_txt,    (char *) "TXT",   (char *) "text"},
  {ns_t_rp,     (char *) "RP",    (char *) "responsible person"},
  {ns_t_afsdb,  (char *) "AFSDB", (char *) "DCE or AFS server"},
  {ns_t_x25,    (char *) "X25",   (char *) "X25 address"},
  {ns_t_isdn,   (char *) "ISDN",  (char *) "ISDN address"},
  {ns_t_rt,     (char *) "RT",    (char *) "router"},
  {ns_t_nsap,   (char *) "NSAP",  (char *) "nsap address"},
  {ns_t_nsap_ptr, (char *) "NSAP_PTR", (char *) "domain name pointer"},
  {ns_t_sig,    (char *) "SIG",   (char *) "signature"},
  {ns_t_key,    (char *) "KEY",   (char *) "key"},
  {ns_t_px,     (char *) "PX",    (char *) "mapping information"},
  {ns_t_gpos,   (char *) "GPOS",
   (char *) "geographical position (withdrawn)"},
  {ns_t_aaaa,   (char *) "AAAA",  (char *) "IPv6 address"},
  {ns_t_loc,    (char *) "LOC",   (char *) "location"},
  {ns_t_nxt,    (char *) "NXT",   (char *) "next valid name (unimplemented)"},
  {ns_t_eid,    (char *) "EID",   (char *) "endpoint identifier (unimplemented)"},
  {ns_t_nimloc, (char *) "NIMLOC", (char *) "NIMROD locator (unimplemented)"},
  {ns_t_srv,    (char *) "SRV",   (char *) "server selection"},
  {ns_t_atma,   (char *) "ATMA",  (char *) "ATM address (unimplemented)"},
  {ns_t_dname,  (char *) "DNAME", (char *) "Non-terminal DNAME (for IPv6)"},
  {ns_t_tsig,   (char *) "TSIG",  (char *) "transaction signature"},
  {ns_t_ixfr,   (char *) "IXFR",  (char *) "incremental zone transfer"},
  {ns_t_axfr,   (char *) "AXFR",  (char *) "zone transfer"},
  {ns_t_mailb,  (char *) "MAILB", (char *) "mailbox-related data (deprecated)"},
  {ns_t_maila,  (char *) "MAILA", (char *) "mail agent (deprecated)"},
  {ns_t_naptr,  (char *) "NAPTR", (char *) "URN Naming Authority"},
  {ns_t_kx,     (char *) "KX",    (char *) "Key Exchange"},
  {ns_t_cert,   (char *) "CERT",  (char *) "Certificate"},
  {ns_t_any,    (char *) "ANY",   (char *) "\"any\""},
  {0, NULL, NULL},		/* Padding to preserve ABI.  */
  {0, NULL, NULL}
};
libresolv_hidden_data_def (__p_type_syms)

/*
 * Names of DNS rcodes.
 */
const struct res_sym __p_rcode_syms[] attribute_hidden = {
  {ns_r_noerror,  (char *) "NOERROR",  (char *) "no error"},
  {ns_r_formerr,  (char *) "FORMERR",  (char *) "format error"},
  {ns_r_servfail, (char *) "SERVFAIL", (char *) "server failed"},
  {ns_r_nxdomain, (char *) "NXDOMAIN", (char *) "no such domain name"},
  {ns_r_notimpl,  (char *) "NOTIMP",   (char *) "not implemented"},
  {ns_r_refused,  (char *) "REFUSED",  (char *) "refused"},
  {ns_r_yxdomain, (char *) "YXDOMAIN", (char *) "domain name exists"},
  {ns_r_yxrrset,  (char *) "YXRRSET",  (char *) "rrset exists"},
  {ns_r_nxrrset,  (char *) "NXRRSET",  (char *) "rrset doesn't exist"},
  {ns_r_notauth,  (char *) "NOTAUTH",  (char *) "not authoritative"},
  {ns_r_notzone,  (char *) "NOTZONE",  (char *) "Not in zone"},
  {ns_r_max,      (char *) "",         (char *) ""},
  {ns_r_badsig,   (char *) "BADSIG",   (char *) "bad signature"},
  {ns_r_badkey,   (char *) "BADKEY",   (char *) "bad key"},
  {ns_r_badtime,  (char *) "BADTIME",  (char *) "bad time"},
  {0, NULL, NULL}
};

int
sym_ston(const struct res_sym *syms, const char *name, int *success) {
	for ((void)NULL; syms->name != 0; syms++) {
		if (strcasecmp (name, syms->name) == 0) {
			if (success)
				*success = 1;
			return (syms->number);
		}
	}
	if (success)
		*success = 0;
	return (syms->number);		/* The default value. */
}

const char *
sym_ntos(const struct res_sym *syms, int number, int *success) {
	static char unname[20];

	for ((void)NULL; syms->name != 0; syms++) {
		if (number == syms->number) {
			if (success)
				*success = 1;
			return (syms->name);
		}
	}

	sprintf(unname, "%d", number);		/* XXX nonreentrant */
	if (success)
		*success = 0;
	return (unname);
}
libresolv_hidden_def (sym_ntos)

const char *
sym_ntop(const struct res_sym *syms, int number, int *success) {
	static char unname[20];

	for ((void)NULL; syms->name != 0; syms++) {
		if (number == syms->number) {
			if (success)
				*success = 1;
			return (syms->humanname);
		}
	}
	sprintf(unname, "%d", number);		/* XXX nonreentrant */
	if (success)
		*success = 0;
	return (unname);
}

/*
 * Return a string for the type.
 */
const char *
p_type(int type) {
	return (sym_ntos(__p_type_syms, type, (int *)0));
}
libresolv_hidden_def (p_type)

/*
 * Return a string for the type.
 */
static const char *
p_section(int section, int opcode) {
	const struct res_sym *symbols;

	switch (opcode) {
	case ns_o_update:
		symbols = __p_update_section_syms;
		break;
	default:
		symbols = __p_default_section_syms;
		break;
	}
	return (sym_ntos(symbols, section, (int *)0));
}

/*
 * Return a mnemonic for class.
 */
const char *
p_class(int class) {
	return (sym_ntos(__p_class_syms, class, (int *)0));
}
libresolv_hidden_def (p_class)

/*
 * Return a mnemonic for an option
 */
const char *
p_option(u_long option) {
	static char nbuf[40];

	switch (option) {
	case RES_INIT:		return "init";
	case RES_DEBUG:		return "debug";
	case RES_USEVC:		return "use-vc";
	case RES_IGNTC:		return "igntc";
	case RES_RECURSE:	return "recurs";
	case RES_DEFNAMES:	return "defnam";
	case RES_STAYOPEN:	return "styopn";
	case RES_DNSRCH:	return "dnsrch";
	case RES_INSECURE1:	return "insecure1";
	case RES_INSECURE2:	return "insecure2";
	case RES_NOALIASES:	return "noaliases";
	case DEPRECATED_RES_USE_INET6:	return "inet6";
	case RES_ROTATE:	return "rotate";
	case RES_USE_EDNS0:	return "edns0";
	case RES_SNGLKUP:	return "single-request";
	case RES_SNGLKUPREOP:	return "single-request-reopen";
	case RES_USE_DNSSEC:	return "dnssec";
	case RES_NOTLDQUERY:	return "no-tld-query";
	case RES_NORELOAD:	return "no-reload";
				/* XXX nonreentrant */
	default:		sprintf(nbuf, "?0x%lx?", (u_long)option);
				return (nbuf);
	}
}
libresolv_hidden_def (p_option)

/*
 * Return a mnemonic for a time to live.
 */
const char *
p_time(uint32_t value) {
	static char nbuf[40];		/* XXX nonreentrant */

	if (ns_format_ttl(value, nbuf, sizeof nbuf) < 0)
		sprintf(nbuf, "%u", value);
	return (nbuf);
}

/*
 * Return a string for the rcode.
 */
const char *
p_rcode(int rcode) {
	return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
}
libresolv_hidden_def (p_rcode)

/*
 * routines to convert between on-the-wire RR format and zone file format.
 * Does not contain conversion to/from decimal degrees; divide or multiply
 * by 60*60*1000 for that.
 */

static const unsigned int poweroften[10]=
  { 1, 10, 100, 1000, 10000, 100000,
    1000000,10000000,100000000,1000000000};

/* takes an XeY precision/size value, returns a string representation. */
static const char *
precsize_ntoa (uint8_t prec)
{
	static char retbuf[sizeof "90000000.00"];	/* XXX nonreentrant */
	unsigned long val;
	int mantissa, exponent;

	mantissa = (int)((prec >> 4) & 0x0f) % 10;
	exponent = (int)((prec >> 0) & 0x0f) % 10;

	val = mantissa * poweroften[exponent];

	(void) sprintf(retbuf, "%ld.%.2ld", val/100, val%100);
	return (retbuf);
}

/* converts ascii size/precision X * 10**Y(cm) to 0xXY.  moves pointer. */
static uint8_t
precsize_aton (const char **strptr)
{
	unsigned int mval = 0, cmval = 0;
	uint8_t retval = 0;
	const char *cp;
	int exponent;
	int mantissa;

	cp = *strptr;

	while (isdigit(*cp))
		mval = mval * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* centimeters */
		cp++;
		if (isdigit(*cp)) {
			cmval = (*cp++ - '0') * 10;
			if (isdigit(*cp)) {
				cmval += (*cp++ - '0');
			}
		}
	}
	cmval = (mval * 100) + cmval;

	for (exponent = 0; exponent < 9; exponent++)
		if (cmval < poweroften[exponent+1])
			break;

	mantissa = cmval / poweroften[exponent];
	if (mantissa > 9)
		mantissa = 9;

	retval = (mantissa << 4) | exponent;

	*strptr = cp;

	return (retval);
}

/* converts ascii lat/lon to unsigned encoded 32-bit number.  moves pointer. */
static uint32_t
latlon2ul (const char **latlonstrptr, int *which)
{
	const char *cp;
	uint32_t retval;
	int deg = 0, min = 0, secs = 0, secsfrac = 0;

	cp = *latlonstrptr;

	while (isdigit(*cp))
		deg = deg * 10 + (*cp++ - '0');

	while (isspace(*cp))
		cp++;

	if (!(isdigit(*cp)))
		goto fndhemi;

	while (isdigit(*cp))
		min = min * 10 + (*cp++ - '0');

	while (isspace(*cp))
		cp++;

	if (!(isdigit(*cp)))
		goto fndhemi;

	while (isdigit(*cp))
		secs = secs * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* decimal seconds */
		cp++;
		if (isdigit(*cp)) {
			secsfrac = (*cp++ - '0') * 100;
			if (isdigit(*cp)) {
				secsfrac += (*cp++ - '0') * 10;
				if (isdigit(*cp)) {
					secsfrac += (*cp++ - '0');
				}
			}
		}
	}

	while (!isspace(*cp))	/* if any trailing garbage */
		cp++;

	while (isspace(*cp))
		cp++;

 fndhemi:
	switch (*cp) {
	case 'N': case 'n':
	case 'E': case 'e':
		retval = ((unsigned)1<<31)
			+ (((((deg * 60) + min) * 60) + secs) * 1000)
			+ secsfrac;
		break;
	case 'S': case 's':
	case 'W': case 'w':
		retval = ((unsigned)1<<31)
			- (((((deg * 60) + min) * 60) + secs) * 1000)
			- secsfrac;
		break;
	default:
		retval = 0;	/* invalid value -- indicates error */
		break;
	}

	switch (*cp) {
	case 'N': case 'n':
	case 'S': case 's':
		*which = 1;	/* latitude */
		break;
	case 'E': case 'e':
	case 'W': case 'w':
		*which = 2;	/* longitude */
		break;
	default:
		*which = 0;	/* error */
		break;
	}

	cp++;			/* skip the hemisphere */

	while (!isspace(*cp))	/* if any trailing garbage */
		cp++;

	while (isspace(*cp))	/* move to next field */
		cp++;

	*latlonstrptr = cp;

	return (retval);
}

/* converts a zone file representation in a string to an RDATA on-the-wire
 * representation. */
int
loc_aton (const char *ascii, u_char *binary)
{
	const char *cp, *maxcp;
	u_char *bcp;

	uint32_t latit = 0, longit = 0, alt = 0;
	uint32_t lltemp1 = 0, lltemp2 = 0;
	int altmeters = 0, altfrac = 0, altsign = 1;
	uint8_t hp = 0x16;	/* default = 1e6 cm = 10000.00m = 10km */
	uint8_t vp = 0x13;	/* default = 1e3 cm = 10.00m */
	uint8_t siz = 0x12;	/* default = 1e2 cm = 1.00m */
	int which1 = 0, which2 = 0;

	cp = ascii;
	maxcp = cp + strlen(ascii);

	lltemp1 = latlon2ul(&cp, &which1);

	lltemp2 = latlon2ul(&cp, &which2);

	switch (which1 + which2) {
	case 3:			/* 1 + 2, the only valid combination */
		if ((which1 == 1) && (which2 == 2)) { /* normal case */
			latit = lltemp1;
			longit = lltemp2;
		} else if ((which1 == 2) && (which2 == 1)) { /* reversed */
			longit = lltemp1;
			latit = lltemp2;
		} else {	/* some kind of brokenness */
			return (0);
		}
		break;
	default:		/* we didn't get one of each */
		return (0);
	}

	/* altitude */
	if (*cp == '-') {
		altsign = -1;
		cp++;
	}

	if (*cp == '+')
		cp++;

	while (isdigit(*cp))
		altmeters = altmeters * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* decimal meters */
		cp++;
		if (isdigit(*cp)) {
			altfrac = (*cp++ - '0') * 10;
			if (isdigit(*cp)) {
				altfrac += (*cp++ - '0');
			}
		}
	}

	alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));

	while (!isspace(*cp) && (cp < maxcp)) /* if trailing garbage or m */
		cp++;

	while (isspace(*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	siz = precsize_aton(&cp);

	while (!isspace(*cp) && (cp < maxcp))	/* if trailing garbage or m */
		cp++;

	while (isspace(*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	hp = precsize_aton(&cp);

	while (!isspace(*cp) && (cp < maxcp))	/* if trailing garbage or m */
		cp++;

	while (isspace(*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	vp = precsize_aton(&cp);

 defaults:

	bcp = binary;
	*bcp++ = (uint8_t) 0;	/* version byte */
	*bcp++ = siz;
	*bcp++ = hp;
	*bcp++ = vp;
	PUTLONG(latit,bcp);
	PUTLONG(longit,bcp);
	PUTLONG(alt,bcp);

	return (16);		/* size of RR in octets */
}

/* takes an on-the-wire LOC RR and formats it in a human readable format. */
const char *
loc_ntoa (const u_char *binary, char *ascii)
{
	static const char error[] = "?";
	static char tmpbuf[sizeof
"1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
	const u_char *cp = binary;

	int latdeg, latmin, latsec, latsecfrac;
	int longdeg, longmin, longsec, longsecfrac;
	char northsouth, eastwest;
	int altmeters, altfrac, altsign;

	const uint32_t referencealt = 100000 * 100;

	int32_t latval, longval, altval;
	uint32_t templ;
	uint8_t sizeval, hpval, vpval, versionval;

	char *sizestr, *hpstr, *vpstr;

	versionval = *cp++;

	if (ascii == NULL)
		ascii = tmpbuf;

	if (versionval) {
		(void) sprintf(ascii, "; error: unknown LOC RR version");
		return (ascii);
	}

	sizeval = *cp++;

	hpval = *cp++;
	vpval = *cp++;

	GETLONG(templ, cp);
	latval = (templ - ((unsigned)1<<31));

	GETLONG(templ, cp);
	longval = (templ - ((unsigned)1<<31));

	GETLONG(templ, cp);
	if (templ < referencealt) { /* below WGS 84 spheroid */
		altval = referencealt - templ;
		altsign = -1;
	} else {
		altval = templ - referencealt;
		altsign = 1;
	}

	if (latval < 0) {
		northsouth = 'S';
		latval = -latval;
	} else
		northsouth = 'N';

	latsecfrac = latval % 1000;
	latval = latval / 1000;
	latsec = latval % 60;
	latval = latval / 60;
	latmin = latval % 60;
	latval = latval / 60;
	latdeg = latval;

	if (longval < 0) {
		eastwest = 'W';
		longval = -longval;
	} else
		eastwest = 'E';

	longsecfrac = longval % 1000;
	longval = longval / 1000;
	longsec = longval % 60;
	longval = longval / 60;
	longmin = longval % 60;
	longval = longval / 60;
	longdeg = longval;

	altfrac = altval % 100;
	altmeters = (altval / 100) * altsign;

	if ((sizestr = strdup(precsize_ntoa(sizeval))) == NULL)
		sizestr = (char *) error;
	if ((hpstr = strdup(precsize_ntoa(hpval))) == NULL)
		hpstr = (char *) error;
	if ((vpstr = strdup(precsize_ntoa(vpval))) == NULL)
		vpstr = (char *) error;

	sprintf(ascii,
	      "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %d.%.2dm %sm %sm %sm",
		latdeg, latmin, latsec, latsecfrac, northsouth,
		longdeg, longmin, longsec, longsecfrac, eastwest,
		altmeters, altfrac, sizestr, hpstr, vpstr);

	if (sizestr != (char *) error)
		free(sizestr);
	if (hpstr != (char *) error)
		free(hpstr);
	if (vpstr != (char *) error)
		free(vpstr);

	return (ascii);
}
libresolv_hidden_def (loc_ntoa)


/* Return the number of DNS hierarchy levels in the name. */
int
dn_count_labels(const char *name) {
	int i, len, count;

	len = strlen(name);
	for (i = 0, count = 0; i < len; i++) {
		/* XXX need to check for \. or use named's nlabels(). */
		if (name[i] == '.')
			count++;
	}

	/* don't count initial wildcard */
	if (name[0] == '*')
		if (count)
			count--;

	/* don't count the null label for root. */
	/* if terminating '.' not found, must adjust */
	/* count to include last label */
	if (len > 0 && name[len-1] != '.')
		count++;
	return (count);
}
libresolv_hidden_def (__dn_count_labels)


#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_27)
/*
 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.
 * SIG records are required to be printed like this, by the Secure DNS RFC.
 * This is an obsolescent function and does not handle dates outside the
 * signed 32-bit range.
 */
char *
__p_secstodate (u_long secs) {
	/* XXX nonreentrant */
	static char output[15];		/* YYYYMMDDHHMMSS and null */
	time_t clock = secs;
	struct tm *time;

	struct tm timebuf;
	/* The call to __gmtime_r can never produce a year overflowing
	   the range of int, given the check on SECS, but check for a
	   NULL return anyway to avoid a null pointer dereference in
	   case there are any other unspecified errors.  */
	if (secs > 0x7fffffff
	    || (time = __gmtime_r (&clock, &timebuf)) == NULL) {
		strcpy (output, "<overflow>");
		__set_errno (EOVERFLOW);
		return output;
	}
	time->tm_year += 1900;
	time->tm_mon += 1;
	/* The struct tm fields, given the above range check,
	   must have values that mean this sprintf exactly fills the
	   buffer.  But as of GCC 8 of 2017-11-21, GCC cannot tell
	   that, even given range checks on all fields with
	   __builtin_unreachable called for out-of-range values.  */
	DIAG_PUSH_NEEDS_COMMENT;
# if __GNUC_PREREQ (7, 0)
	DIAG_IGNORE_NEEDS_COMMENT (8, "-Wformat-overflow=");
# endif
	sprintf(output, "%04d%02d%02d%02d%02d%02d",
		time->tm_year, time->tm_mon, time->tm_mday,
		time->tm_hour, time->tm_min, time->tm_sec);
	DIAG_POP_NEEDS_COMMENT;
	return (output);
}
compat_symbol (libresolv, __p_secstodate, __p_secstodate, GLIBC_2_0);
#endif