1/*
2 * Copyright (C) 2004-2014  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2003  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id$ */
19
20/*! \file */
21
22#include <config.h>
23#include <ctype.h>
24
25#include <isc/base64.h>
26#include <isc/hex.h>
27#include <isc/lex.h>
28#include <isc/mem.h>
29#include <isc/parseint.h>
30#include <isc/print.h>
31#include <isc/string.h>
32#include <isc/stdlib.h>
33#include <isc/util.h>
34
35#include <dns/callbacks.h>
36#include <dns/cert.h>
37#include <dns/compress.h>
38#include <dns/enumtype.h>
39#include <dns/keyflags.h>
40#include <dns/keyvalues.h>
41#include <dns/message.h>
42#include <dns/rcode.h>
43#include <dns/rdata.h>
44#include <dns/rdataclass.h>
45#include <dns/rdatastruct.h>
46#include <dns/rdatatype.h>
47#include <dns/result.h>
48#include <dns/secalg.h>
49#include <dns/secproto.h>
50#include <dns/time.h>
51#include <dns/ttl.h>
52
53#define RETERR(x) \
54	do { \
55		isc_result_t _r = (x); \
56		if (_r != ISC_R_SUCCESS) \
57			return (_r); \
58	} while (0)
59
60#define RETTOK(x) \
61	do { \
62		isc_result_t _r = (x); \
63		if (_r != ISC_R_SUCCESS) { \
64			isc_lex_ungettoken(lexer, &token); \
65			return (_r); \
66		} \
67	} while (0)
68
69#define DNS_AS_STR(t) ((t).value.as_textregion.base)
70
71#define ARGS_FROMTEXT	int rdclass, dns_rdatatype_t type, \
72			isc_lex_t *lexer, dns_name_t *origin, \
73			unsigned int options, isc_buffer_t *target, \
74			dns_rdatacallbacks_t *callbacks
75
76#define ARGS_TOTEXT	dns_rdata_t *rdata, dns_rdata_textctx_t *tctx, \
77			isc_buffer_t *target
78
79#define ARGS_FROMWIRE	int rdclass, dns_rdatatype_t type, \
80			isc_buffer_t *source, dns_decompress_t *dctx, \
81			unsigned int options, isc_buffer_t *target
82
83#define ARGS_TOWIRE	dns_rdata_t *rdata, dns_compress_t *cctx, \
84			isc_buffer_t *target
85
86#define ARGS_COMPARE	const dns_rdata_t *rdata1, const dns_rdata_t *rdata2
87
88#define ARGS_FROMSTRUCT	int rdclass, dns_rdatatype_t type, \
89			void *source, isc_buffer_t *target
90
91#define ARGS_TOSTRUCT	dns_rdata_t *rdata, void *target, isc_mem_t *mctx
92
93#define ARGS_FREESTRUCT void *source
94
95#define ARGS_ADDLDATA	dns_rdata_t *rdata, dns_additionaldatafunc_t add, \
96			void *arg
97
98#define ARGS_DIGEST	dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg
99
100#define ARGS_CHECKOWNER dns_name_t *name, dns_rdataclass_t rdclass, \
101			dns_rdatatype_t type, isc_boolean_t wildcard
102
103#define ARGS_CHECKNAMES dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad
104
105
106/*%
107 * Context structure for the totext_ functions.
108 * Contains formatting options for rdata-to-text
109 * conversion.
110 */
111typedef struct dns_rdata_textctx {
112	dns_name_t *origin;	/*%< Current origin, or NULL. */
113	unsigned int flags;	/*%< DNS_STYLEFLAG_*  */
114	unsigned int width;	/*%< Width of rdata column. */
115	const char *linebreak;	/*%< Line break string. */
116} dns_rdata_textctx_t;
117
118static isc_result_t
119txt_totext(isc_region_t *source, isc_buffer_t *target);
120
121static isc_result_t
122txt_fromtext(isc_textregion_t *source, isc_buffer_t *target);
123
124static isc_result_t
125txt_fromwire(isc_buffer_t *source, isc_buffer_t *target);
126
127static isc_result_t
128multitxt_totext(isc_region_t *source, isc_buffer_t *target);
129
130static isc_result_t
131multitxt_fromtext(isc_textregion_t *source, isc_buffer_t *target);
132
133static isc_result_t
134multitxt_fromwire(isc_buffer_t *source, isc_buffer_t *target);
135
136static isc_boolean_t
137name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target);
138
139static unsigned int
140name_length(dns_name_t *name);
141
142static isc_result_t
143str_totext(const char *source, isc_buffer_t *target);
144
145static isc_result_t
146inet_totext(int af, isc_region_t *src, isc_buffer_t *target);
147
148static isc_boolean_t
149buffer_empty(isc_buffer_t *source);
150
151static void
152buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region);
153
154static isc_result_t
155uint32_tobuffer(isc_uint32_t, isc_buffer_t *target);
156
157static isc_result_t
158uint16_tobuffer(isc_uint32_t, isc_buffer_t *target);
159
160static isc_result_t
161uint8_tobuffer(isc_uint32_t, isc_buffer_t *target);
162
163static isc_result_t
164name_tobuffer(dns_name_t *name, isc_buffer_t *target);
165
166static isc_uint32_t
167uint32_fromregion(isc_region_t *region);
168
169static isc_uint16_t
170uint16_fromregion(isc_region_t *region);
171
172static isc_uint8_t
173uint8_fromregion(isc_region_t *region);
174
175static isc_uint8_t
176uint8_consume_fromregion(isc_region_t *region);
177
178static isc_result_t
179mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
180
181static int
182hexvalue(char value);
183
184static int
185decvalue(char value);
186
187static isc_result_t
188btoa_totext(unsigned char *inbuf, int inbuflen, isc_buffer_t *target);
189
190static isc_result_t
191atob_tobuffer(isc_lex_t *lexer, isc_buffer_t *target);
192
193static void
194default_fromtext_callback(dns_rdatacallbacks_t *callbacks, const char *, ...)
195     ISC_FORMAT_PRINTF(2, 3);
196
197static void
198fromtext_error(void (*callback)(dns_rdatacallbacks_t *, const char *, ...),
199	       dns_rdatacallbacks_t *callbacks, const char *name,
200	       unsigned long line, isc_token_t *token, isc_result_t result);
201
202static void
203fromtext_warneof(isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks);
204
205static isc_result_t
206rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
207	     isc_buffer_t *target);
208
209static void
210warn_badname(dns_name_t *name, isc_lex_t *lexer,
211	     dns_rdatacallbacks_t *callbacks);
212
213static void
214warn_badmx(isc_token_t *token, isc_lex_t *lexer,
215	   dns_rdatacallbacks_t *callbacks);
216
217static isc_uint16_t
218uint16_consume_fromregion(isc_region_t *region);
219
220static isc_result_t
221unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
222	       isc_buffer_t *target);
223
224/*% INT16 Size */
225#define NS_INT16SZ	2
226/*% IPv6 Address Size */
227#define NS_LOCATORSZ	8
228
229/*%
230 *	convert presentation level address to network order binary form.
231 * \return
232 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
233 * \note
234 *	(1) does not touch `dst' unless it's returning 1.
235 */
236static inline int
237locator_pton(const char *src, unsigned char *dst) {
238	static const char xdigits_l[] = "0123456789abcdef",
239			  xdigits_u[] = "0123456789ABCDEF";
240	unsigned char tmp[NS_LOCATORSZ];
241	unsigned char *tp = tmp, *endp;
242	const char *xdigits;
243	int ch, seen_xdigits;
244	unsigned int val;
245
246	memset(tp, '\0', NS_LOCATORSZ);
247	endp = tp + NS_LOCATORSZ;
248	seen_xdigits = 0;
249	val = 0;
250	while ((ch = *src++) != '\0') {
251		const char *pch;
252
253		pch = strchr((xdigits = xdigits_l), ch);
254		if (pch == NULL)
255			pch = strchr((xdigits = xdigits_u), ch);
256		if (pch != NULL) {
257			val <<= 4;
258			val |= (pch - xdigits);
259			if (++seen_xdigits > 4)
260				return (0);
261			continue;
262		}
263		if (ch == ':') {
264			if (!seen_xdigits)
265				return (0);
266			if (tp + NS_INT16SZ > endp)
267				return (0);
268			*tp++ = (unsigned char) (val >> 8) & 0xff;
269			*tp++ = (unsigned char) val & 0xff;
270			seen_xdigits = 0;
271			val = 0;
272			continue;
273		}
274		return (0);
275	}
276	if (seen_xdigits) {
277		if (tp + NS_INT16SZ > endp)
278			return (0);
279		*tp++ = (unsigned char) (val >> 8) & 0xff;
280		*tp++ = (unsigned char) val & 0xff;
281	}
282	if (tp != endp)
283		return (0);
284	memmove(dst, tmp, NS_LOCATORSZ);
285	return (1);
286}
287
288static inline int
289getquad(const void *src, struct in_addr *dst,
290	isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks)
291{
292	int result;
293	struct in_addr *tmp;
294
295	result = inet_aton(src, dst);
296	if (result == 1 && callbacks != NULL &&
297	    inet_pton(AF_INET, src, &tmp) != 1) {
298		const char *name = isc_lex_getsourcename(lexer);
299		if (name == NULL)
300			name = "UNKNOWN";
301		(*callbacks->warn)(callbacks, "%s:%lu: \"%s\" "
302				   "is not a decimal dotted quad", name,
303				   isc_lex_getsourceline(lexer), src);
304	}
305	return (result);
306}
307
308static inline isc_result_t
309name_duporclone(dns_name_t *source, isc_mem_t *mctx, dns_name_t *target) {
310
311	if (mctx != NULL)
312		return (dns_name_dup(source, mctx, target));
313	dns_name_clone(source, target);
314	return (ISC_R_SUCCESS);
315}
316
317static inline void *
318mem_maybedup(isc_mem_t *mctx, void *source, size_t length) {
319	void *new;
320
321	if (mctx == NULL)
322		return (source);
323	new = isc_mem_allocate(mctx, length);
324	if (new != NULL)
325		memmove(new, source, length);
326
327	return (new);
328}
329
330static const char hexdigits[] = "0123456789abcdef";
331static const char decdigits[] = "0123456789";
332
333#include "code.h"
334
335#define META 0x0001
336#define RESERVED 0x0002
337
338/***
339 *** Initialization
340 ***/
341
342void
343dns_rdata_init(dns_rdata_t *rdata) {
344
345	REQUIRE(rdata != NULL);
346
347	rdata->data = NULL;
348	rdata->length = 0;
349	rdata->rdclass = 0;
350	rdata->type = 0;
351	rdata->flags = 0;
352	ISC_LINK_INIT(rdata, link);
353	/* ISC_LIST_INIT(rdata->list); */
354}
355
356void
357dns_rdata_reset(dns_rdata_t *rdata) {
358
359	REQUIRE(rdata != NULL);
360
361	REQUIRE(!ISC_LINK_LINKED(rdata, link));
362	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
363
364	rdata->data = NULL;
365	rdata->length = 0;
366	rdata->rdclass = 0;
367	rdata->type = 0;
368	rdata->flags = 0;
369}
370
371/***
372 ***
373 ***/
374
375void
376dns_rdata_clone(const dns_rdata_t *src, dns_rdata_t *target) {
377
378	REQUIRE(src != NULL);
379	REQUIRE(target != NULL);
380
381	REQUIRE(DNS_RDATA_INITIALIZED(target));
382
383	REQUIRE(DNS_RDATA_VALIDFLAGS(src));
384	REQUIRE(DNS_RDATA_VALIDFLAGS(target));
385
386	target->data = src->data;
387	target->length = src->length;
388	target->rdclass = src->rdclass;
389	target->type = src->type;
390	target->flags = src->flags;
391}
392
393
394/***
395 *** Comparisons
396 ***/
397
398int
399dns_rdata_compare(const dns_rdata_t *rdata1, const dns_rdata_t *rdata2) {
400	int result = 0;
401	isc_boolean_t use_default = ISC_FALSE;
402
403	REQUIRE(rdata1 != NULL);
404	REQUIRE(rdata2 != NULL);
405	REQUIRE(rdata1->length == 0 || rdata1->data != NULL);
406	REQUIRE(rdata2->length == 0 || rdata2->data != NULL);
407	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata1));
408	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata2));
409
410	if (rdata1->rdclass != rdata2->rdclass)
411		return (rdata1->rdclass < rdata2->rdclass ? -1 : 1);
412
413	if (rdata1->type != rdata2->type)
414		return (rdata1->type < rdata2->type ? -1 : 1);
415
416	COMPARESWITCH
417
418	if (use_default) {
419		isc_region_t r1;
420		isc_region_t r2;
421
422		dns_rdata_toregion(rdata1, &r1);
423		dns_rdata_toregion(rdata2, &r2);
424		result = isc_region_compare(&r1, &r2);
425	}
426	return (result);
427}
428
429int
430dns_rdata_casecompare(const dns_rdata_t *rdata1, const dns_rdata_t *rdata2) {
431	int result = 0;
432	isc_boolean_t use_default = ISC_FALSE;
433
434	REQUIRE(rdata1 != NULL);
435	REQUIRE(rdata2 != NULL);
436	REQUIRE(rdata1->length == 0 || rdata1->data != NULL);
437	REQUIRE(rdata2->length == 0 || rdata2->data != NULL);
438	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata1));
439	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata2));
440
441	if (rdata1->rdclass != rdata2->rdclass)
442		return (rdata1->rdclass < rdata2->rdclass ? -1 : 1);
443
444	if (rdata1->type != rdata2->type)
445		return (rdata1->type < rdata2->type ? -1 : 1);
446
447	CASECOMPARESWITCH
448
449	if (use_default) {
450		isc_region_t r1;
451		isc_region_t r2;
452
453		dns_rdata_toregion(rdata1, &r1);
454		dns_rdata_toregion(rdata2, &r2);
455		result = isc_region_compare(&r1, &r2);
456	}
457	return (result);
458}
459
460/***
461 *** Conversions
462 ***/
463
464void
465dns_rdata_fromregion(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
466		     dns_rdatatype_t type, isc_region_t *r)
467{
468
469	REQUIRE(rdata != NULL);
470	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
471	REQUIRE(r != NULL);
472
473	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
474
475	rdata->data = r->base;
476	rdata->length = r->length;
477	rdata->rdclass = rdclass;
478	rdata->type = type;
479	rdata->flags = 0;
480}
481
482void
483dns_rdata_toregion(const dns_rdata_t *rdata, isc_region_t *r) {
484
485	REQUIRE(rdata != NULL);
486	REQUIRE(r != NULL);
487	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
488
489	r->base = rdata->data;
490	r->length = rdata->length;
491}
492
493isc_result_t
494dns_rdata_fromwire(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
495		   dns_rdatatype_t type, isc_buffer_t *source,
496		   dns_decompress_t *dctx, unsigned int options,
497		   isc_buffer_t *target)
498{
499	isc_result_t result = ISC_R_NOTIMPLEMENTED;
500	isc_region_t region;
501	isc_buffer_t ss;
502	isc_buffer_t st;
503	isc_boolean_t use_default = ISC_FALSE;
504	isc_uint32_t activelength;
505	unsigned int length;
506
507	REQUIRE(dctx != NULL);
508	if (rdata != NULL) {
509		REQUIRE(DNS_RDATA_INITIALIZED(rdata));
510		REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
511	}
512	REQUIRE(source != NULL);
513	REQUIRE(target != NULL);
514
515	if (type == 0)
516		return (DNS_R_FORMERR);
517
518	ss = *source;
519	st = *target;
520
521	activelength = isc_buffer_activelength(source);
522	INSIST(activelength < 65536);
523
524	FROMWIRESWITCH
525
526	if (use_default) {
527		if (activelength > isc_buffer_availablelength(target))
528			result = ISC_R_NOSPACE;
529		else {
530			isc_buffer_putmem(target, isc_buffer_current(source),
531					  activelength);
532			isc_buffer_forward(source, activelength);
533			result = ISC_R_SUCCESS;
534		}
535	}
536
537	/*
538	 * Reject any rdata that expands out to more than DNS_RDATA_MAXLENGTH
539	 * as we cannot transmit it.
540	 */
541	length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
542	if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
543		result = DNS_R_FORMERR;
544
545	/*
546	 * We should have consumed all of our buffer.
547	 */
548	if (result == ISC_R_SUCCESS && !buffer_empty(source))
549		result = DNS_R_EXTRADATA;
550
551	if (rdata != NULL && result == ISC_R_SUCCESS) {
552		region.base = isc_buffer_used(&st);
553		region.length = length;
554		dns_rdata_fromregion(rdata, rdclass, type, &region);
555	}
556
557	if (result != ISC_R_SUCCESS) {
558		*source = ss;
559		*target = st;
560	}
561	return (result);
562}
563
564isc_result_t
565dns_rdata_towire(dns_rdata_t *rdata, dns_compress_t *cctx,
566		 isc_buffer_t *target)
567{
568	isc_result_t result = ISC_R_NOTIMPLEMENTED;
569	isc_boolean_t use_default = ISC_FALSE;
570	isc_region_t tr;
571	isc_buffer_t st;
572
573	REQUIRE(rdata != NULL);
574	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
575
576	/*
577	 * Some DynDNS meta-RRs have empty rdata.
578	 */
579	if ((rdata->flags & DNS_RDATA_UPDATE) != 0) {
580		INSIST(rdata->length == 0);
581		return (ISC_R_SUCCESS);
582	}
583
584	st = *target;
585
586	TOWIRESWITCH
587
588	if (use_default) {
589		isc_buffer_availableregion(target, &tr);
590		if (tr.length < rdata->length)
591			return (ISC_R_NOSPACE);
592		memmove(tr.base, rdata->data, rdata->length);
593		isc_buffer_add(target, rdata->length);
594		return (ISC_R_SUCCESS);
595	}
596	if (result != ISC_R_SUCCESS) {
597		*target = st;
598		INSIST(target->used < 65536);
599		dns_compress_rollback(cctx, (isc_uint16_t)target->used);
600	}
601	return (result);
602}
603
604/*
605 * If the binary data in 'src' is valid uncompressed wire format
606 * rdata of class 'rdclass' and type 'type', return ISC_R_SUCCESS
607 * and copy the validated rdata to 'dest'.  Otherwise return an error.
608 */
609static isc_result_t
610rdata_validate(isc_buffer_t *src, isc_buffer_t *dest, dns_rdataclass_t rdclass,
611	    dns_rdatatype_t type)
612{
613	dns_decompress_t dctx;
614	isc_result_t result;
615
616	dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
617	isc_buffer_setactive(src, isc_buffer_usedlength(src));
618	result = dns_rdata_fromwire(NULL, rdclass, type, src, &dctx, 0, dest);
619	dns_decompress_invalidate(&dctx);
620
621	return (result);
622}
623
624static isc_result_t
625unknown_fromtext(dns_rdataclass_t rdclass, dns_rdatatype_t type,
626		 isc_lex_t *lexer, isc_mem_t *mctx, isc_buffer_t *target)
627{
628	isc_result_t result;
629	isc_buffer_t *buf = NULL;
630	isc_token_t token;
631
632	if (type == 0 || dns_rdatatype_ismeta(type))
633		return (DNS_R_METATYPE);
634
635	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
636					ISC_FALSE));
637	if (token.value.as_ulong > 65535U)
638		return (ISC_R_RANGE);
639	result = isc_buffer_allocate(mctx, &buf, token.value.as_ulong);
640	if (result != ISC_R_SUCCESS)
641		return (result);
642
643	result = isc_hex_tobuffer(lexer, buf,
644				  (unsigned int)token.value.as_ulong);
645	if (result != ISC_R_SUCCESS)
646	       goto failure;
647	if (isc_buffer_usedlength(buf) != token.value.as_ulong) {
648		result = ISC_R_UNEXPECTEDEND;
649		goto failure;
650	}
651
652	if (dns_rdatatype_isknown(type)) {
653		result = rdata_validate(buf, target, rdclass, type);
654	} else {
655		isc_region_t r;
656		isc_buffer_usedregion(buf, &r);
657		result = isc_buffer_copyregion(target, &r);
658	}
659	if (result != ISC_R_SUCCESS)
660		goto failure;
661
662	isc_buffer_free(&buf);
663	return (ISC_R_SUCCESS);
664
665 failure:
666	isc_buffer_free(&buf);
667	return (result);
668}
669
670isc_result_t
671dns_rdata_fromtext(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
672		   dns_rdatatype_t type, isc_lex_t *lexer,
673		   dns_name_t *origin, unsigned int options, isc_mem_t *mctx,
674		   isc_buffer_t *target, dns_rdatacallbacks_t *callbacks)
675{
676	isc_result_t result = ISC_R_NOTIMPLEMENTED;
677	isc_region_t region;
678	isc_buffer_t st;
679	isc_token_t token;
680	unsigned int lexoptions = ISC_LEXOPT_EOL | ISC_LEXOPT_EOF |
681				  ISC_LEXOPT_DNSMULTILINE | ISC_LEXOPT_ESCAPE;
682	char *name;
683	unsigned long line;
684	void (*callback)(dns_rdatacallbacks_t *, const char *, ...);
685	isc_result_t tresult;
686	unsigned int length;
687	isc_boolean_t unknown;
688
689	REQUIRE(origin == NULL || dns_name_isabsolute(origin) == ISC_TRUE);
690	if (rdata != NULL) {
691		REQUIRE(DNS_RDATA_INITIALIZED(rdata));
692		REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
693	}
694	if (callbacks != NULL) {
695		REQUIRE(callbacks->warn != NULL);
696		REQUIRE(callbacks->error != NULL);
697	}
698
699	st = *target;
700
701	if (callbacks != NULL)
702		callback = callbacks->error;
703	else
704		callback = default_fromtext_callback;
705
706	result = isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
707					ISC_FALSE);
708	if (result != ISC_R_SUCCESS) {
709		name = isc_lex_getsourcename(lexer);
710		line = isc_lex_getsourceline(lexer);
711		fromtext_error(callback, callbacks, name, line, NULL, result);
712		return (result);
713	}
714
715	unknown = ISC_FALSE;
716	if (token.type == isc_tokentype_string &&
717	    strcmp(DNS_AS_STR(token), "\\#") == 0) {
718		/*
719		 * If this is a TXT record '\#' could be a escaped '#'.
720		 * Look to see if the next token is a number and if so
721		 * treat it as a unknown record format.
722		 */
723		if (type == dns_rdatatype_txt) {
724			result = isc_lex_getmastertoken(lexer, &token,
725							isc_tokentype_number,
726							ISC_FALSE);
727			if (result == ISC_R_SUCCESS)
728				isc_lex_ungettoken(lexer, &token);
729		}
730
731		if (result == ISC_R_SUCCESS) {
732			unknown = ISC_TRUE;
733			result = unknown_fromtext(rdclass, type, lexer,
734						  mctx, target);
735		} else
736			options |= DNS_RDATA_UNKNOWNESCAPE;
737	} else
738		isc_lex_ungettoken(lexer, &token);
739
740	if (!unknown)
741		FROMTEXTSWITCH
742
743	/*
744	 * Consume to end of line / file.
745	 * If not at end of line initially set error code.
746	 * Call callback via fromtext_error once if there was an error.
747	 */
748	do {
749		name = isc_lex_getsourcename(lexer);
750		line = isc_lex_getsourceline(lexer);
751		tresult = isc_lex_gettoken(lexer, lexoptions, &token);
752		if (tresult != ISC_R_SUCCESS) {
753			if (result == ISC_R_SUCCESS)
754				result = tresult;
755			if (callback != NULL)
756				fromtext_error(callback, callbacks, name,
757					       line, NULL, result);
758			break;
759		} else if (token.type != isc_tokentype_eol &&
760			   token.type != isc_tokentype_eof) {
761			if (result == ISC_R_SUCCESS)
762				result = DNS_R_EXTRATOKEN;
763			if (callback != NULL) {
764				fromtext_error(callback, callbacks, name,
765					       line, &token, result);
766				callback = NULL;
767			}
768		} else if (result != ISC_R_SUCCESS && callback != NULL) {
769			fromtext_error(callback, callbacks, name, line,
770				       &token, result);
771			break;
772		} else {
773			if (token.type == isc_tokentype_eof)
774				fromtext_warneof(lexer, callbacks);
775			break;
776		}
777	} while (1);
778
779	length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
780	if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
781		result = ISC_R_NOSPACE;
782
783	if (rdata != NULL && result == ISC_R_SUCCESS) {
784		region.base = isc_buffer_used(&st);
785		region.length = length;
786		dns_rdata_fromregion(rdata, rdclass, type, &region);
787	}
788	if (result != ISC_R_SUCCESS) {
789		*target = st;
790	}
791	return (result);
792}
793
794static isc_result_t
795unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
796	       isc_buffer_t *target)
797{
798	isc_result_t result;
799	char buf[sizeof("65535")];
800	isc_region_t sr;
801
802	strlcpy(buf, "\\# ", sizeof(buf));
803	result = str_totext(buf, target);
804	if (result != ISC_R_SUCCESS)
805		return (result);
806
807	dns_rdata_toregion(rdata, &sr);
808	INSIST(sr.length < 65536);
809	snprintf(buf, sizeof(buf), "%u", sr.length);
810	result = str_totext(buf, target);
811	if (result != ISC_R_SUCCESS)
812		return (result);
813
814	if (sr.length != 0U) {
815		if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
816			result = str_totext(" ( ", target);
817		else
818			result = str_totext(" ", target);
819
820		if (result != ISC_R_SUCCESS)
821			return (result);
822
823		if (tctx->width == 0) /* No splitting */
824			result = isc_hex_totext(&sr, 0, "", target);
825		else
826			result = isc_hex_totext(&sr, tctx->width - 2,
827						tctx->linebreak,
828						target);
829		if (result == ISC_R_SUCCESS &&
830		    (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
831			result = str_totext(" )", target);
832	}
833	return (result);
834}
835
836static isc_result_t
837rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
838	     isc_buffer_t *target)
839{
840	isc_result_t result = ISC_R_NOTIMPLEMENTED;
841	isc_boolean_t use_default = ISC_FALSE;
842
843	REQUIRE(rdata != NULL);
844	REQUIRE(tctx->origin == NULL ||
845		dns_name_isabsolute(tctx->origin) == ISC_TRUE);
846
847	/*
848	 * Some DynDNS meta-RRs have empty rdata.
849	 */
850	if ((rdata->flags & DNS_RDATA_UPDATE) != 0) {
851		INSIST(rdata->length == 0);
852		return (ISC_R_SUCCESS);
853	}
854
855	TOTEXTSWITCH
856
857	if (use_default)
858		result = unknown_totext(rdata, tctx, target);
859
860	return (result);
861}
862
863isc_result_t
864dns_rdata_totext(dns_rdata_t *rdata, dns_name_t *origin, isc_buffer_t *target)
865{
866	dns_rdata_textctx_t tctx;
867
868	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
869
870	/*
871	 * Set up formatting options for single-line output.
872	 */
873	tctx.origin = origin;
874	tctx.flags = 0;
875	tctx.width = 60;
876	tctx.linebreak = " ";
877	return (rdata_totext(rdata, &tctx, target));
878}
879
880isc_result_t
881dns_rdata_tofmttext(dns_rdata_t *rdata, dns_name_t *origin,
882		    unsigned int flags, unsigned int width,
883		    unsigned int split_width, const char *linebreak,
884		    isc_buffer_t *target)
885{
886	dns_rdata_textctx_t tctx;
887
888	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
889
890	/*
891	 * Set up formatting options for formatted output.
892	 */
893	tctx.origin = origin;
894	tctx.flags = flags;
895	if (split_width == 0xffffffff)
896		tctx.width = width;
897	else
898		tctx.width = split_width;
899
900	if ((flags & DNS_STYLEFLAG_MULTILINE) != 0)
901		tctx.linebreak = linebreak;
902	else {
903		if (split_width == 0xffffffff)
904			tctx.width = 60; /* Used for hex word length only. */
905		tctx.linebreak = " ";
906	}
907	return (rdata_totext(rdata, &tctx, target));
908}
909
910isc_result_t
911dns_rdata_fromstruct(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
912		     dns_rdatatype_t type, void *source,
913		     isc_buffer_t *target)
914{
915	isc_result_t result = ISC_R_NOTIMPLEMENTED;
916	isc_buffer_t st;
917	isc_region_t region;
918	isc_boolean_t use_default = ISC_FALSE;
919	unsigned int length;
920
921	REQUIRE(source != NULL);
922	if (rdata != NULL) {
923		REQUIRE(DNS_RDATA_INITIALIZED(rdata));
924		REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
925	}
926
927	st = *target;
928
929	FROMSTRUCTSWITCH
930
931	if (use_default)
932		(void)NULL;
933
934	length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
935	if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
936		result = ISC_R_NOSPACE;
937
938	if (rdata != NULL && result == ISC_R_SUCCESS) {
939		region.base = isc_buffer_used(&st);
940		region.length = length;
941		dns_rdata_fromregion(rdata, rdclass, type, &region);
942	}
943	if (result != ISC_R_SUCCESS)
944		*target = st;
945	return (result);
946}
947
948isc_result_t
949dns_rdata_tostruct(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {
950	isc_result_t result = ISC_R_NOTIMPLEMENTED;
951	isc_boolean_t use_default = ISC_FALSE;
952
953	REQUIRE(rdata != NULL);
954	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
955
956	TOSTRUCTSWITCH
957
958	if (use_default)
959		(void)NULL;
960
961	return (result);
962}
963
964void
965dns_rdata_freestruct(void *source) {
966	dns_rdatacommon_t *common = source;
967	REQUIRE(source != NULL);
968
969	FREESTRUCTSWITCH
970}
971
972isc_result_t
973dns_rdata_additionaldata(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
974			 void *arg)
975{
976	isc_result_t result = ISC_R_NOTIMPLEMENTED;
977	isc_boolean_t use_default = ISC_FALSE;
978
979	/*
980	 * Call 'add' for each name and type from 'rdata' which is subject to
981	 * additional section processing.
982	 */
983
984	REQUIRE(rdata != NULL);
985	REQUIRE(add != NULL);
986	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
987
988	ADDITIONALDATASWITCH
989
990	/* No additional processing for unknown types */
991	if (use_default)
992		result = ISC_R_SUCCESS;
993
994	return (result);
995}
996
997isc_result_t
998dns_rdata_digest(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {
999	isc_result_t result = ISC_R_NOTIMPLEMENTED;
1000	isc_boolean_t use_default = ISC_FALSE;
1001	isc_region_t r;
1002
1003	/*
1004	 * Send 'rdata' in DNSSEC canonical form to 'digest'.
1005	 */
1006
1007	REQUIRE(rdata != NULL);
1008	REQUIRE(digest != NULL);
1009	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1010
1011	DIGESTSWITCH
1012
1013	if (use_default) {
1014		dns_rdata_toregion(rdata, &r);
1015		result = (digest)(arg, &r);
1016	}
1017
1018	return (result);
1019}
1020
1021isc_boolean_t
1022dns_rdata_checkowner(dns_name_t *name, dns_rdataclass_t rdclass,
1023		     dns_rdatatype_t type, isc_boolean_t wildcard)
1024{
1025	isc_boolean_t result;
1026
1027	CHECKOWNERSWITCH
1028	return (result);
1029}
1030
1031isc_boolean_t
1032dns_rdata_checknames(dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad)
1033{
1034	isc_boolean_t result;
1035
1036	CHECKNAMESSWITCH
1037	return (result);
1038}
1039
1040unsigned int
1041dns_rdatatype_attributes(dns_rdatatype_t type)
1042{
1043	RDATATYPE_ATTRIBUTE_SW
1044	if (type >= (dns_rdatatype_t)128 && type < (dns_rdatatype_t)255)
1045		return (DNS_RDATATYPEATTR_UNKNOWN | DNS_RDATATYPEATTR_META);
1046	return (DNS_RDATATYPEATTR_UNKNOWN);
1047}
1048
1049isc_result_t
1050dns_rdatatype_fromtext(dns_rdatatype_t *typep, isc_textregion_t *source) {
1051	unsigned int hash;
1052	unsigned int n;
1053	unsigned char a, b;
1054
1055	n = source->length;
1056
1057	if (n == 0)
1058		return (DNS_R_UNKNOWN);
1059
1060	a = tolower((unsigned char)source->base[0]);
1061	b = tolower((unsigned char)source->base[n - 1]);
1062
1063	hash = ((a + n) * b) % 256;
1064
1065	/*
1066	 * This switch block is inlined via \#define, and will use "return"
1067	 * to return a result to the caller if it is a valid (known)
1068	 * rdatatype name.
1069	 */
1070	RDATATYPE_FROMTEXT_SW(hash, source->base, n, typep);
1071
1072	if (source->length > 4 && source->length < (4 + sizeof("65000")) &&
1073	    strncasecmp("type", source->base, 4) == 0) {
1074		char buf[sizeof("65000")];
1075		char *endp;
1076		unsigned int val;
1077
1078		strncpy(buf, source->base + 4, source->length - 4);
1079		buf[source->length - 4] = '\0';
1080		val = strtoul(buf, &endp, 10);
1081		if (*endp == '\0' && val <= 0xffff) {
1082			*typep = (dns_rdatatype_t)val;
1083			return (ISC_R_SUCCESS);
1084		}
1085	}
1086
1087	return (DNS_R_UNKNOWN);
1088}
1089
1090isc_result_t
1091dns_rdatatype_totext(dns_rdatatype_t type, isc_buffer_t *target) {
1092	char buf[sizeof("TYPE65535")];
1093
1094	RDATATYPE_TOTEXT_SW
1095	snprintf(buf, sizeof(buf), "TYPE%u", type);
1096	return (str_totext(buf, target));
1097}
1098
1099void
1100dns_rdatatype_format(dns_rdatatype_t rdtype,
1101		     char *array, unsigned int size)
1102{
1103	isc_result_t result;
1104	isc_buffer_t buf;
1105
1106	if (size == 0U)
1107		return;
1108
1109	isc_buffer_init(&buf, array, size);
1110	result = dns_rdatatype_totext(rdtype, &buf);
1111	/*
1112	 * Null terminate.
1113	 */
1114	if (result == ISC_R_SUCCESS) {
1115		if (isc_buffer_availablelength(&buf) >= 1)
1116			isc_buffer_putuint8(&buf, 0);
1117		else
1118			result = ISC_R_NOSPACE;
1119	}
1120	if (result != ISC_R_SUCCESS)
1121		strlcpy(array, "<unknown>", size);
1122}
1123
1124/*
1125 * Private function.
1126 */
1127
1128static unsigned int
1129name_length(dns_name_t *name) {
1130	return (name->length);
1131}
1132
1133static isc_result_t
1134txt_totext(isc_region_t *source, isc_buffer_t *target) {
1135	unsigned int tl;
1136	unsigned int n;
1137	unsigned char *sp;
1138	char *tp;
1139	isc_region_t region;
1140
1141	isc_buffer_availableregion(target, &region);
1142	sp = source->base;
1143	tp = (char *)region.base;
1144	tl = region.length;
1145
1146	n = *sp++;
1147
1148	REQUIRE(n + 1 <= source->length);
1149
1150	if (tl < 1)
1151		return (ISC_R_NOSPACE);
1152	*tp++ = '"';
1153	tl--;
1154	while (n--) {
1155		if (*sp < 0x20 || *sp >= 0x7f) {
1156			if (tl < 4)
1157				return (ISC_R_NOSPACE);
1158			*tp++ = 0x5c;
1159			*tp++ = 0x30 + ((*sp / 100) % 10);
1160			*tp++ = 0x30 + ((*sp / 10) % 10);
1161			*tp++ = 0x30 + (*sp % 10);
1162			sp++;
1163			tl -= 4;
1164			continue;
1165		}
1166		/* double quote, semi-colon, backslash */
1167		if (*sp == 0x22 || *sp == 0x3b || *sp == 0x5c) {
1168			if (tl < 2)
1169				return (ISC_R_NOSPACE);
1170			*tp++ = '\\';
1171			tl--;
1172		}
1173		if (tl < 1)
1174			return (ISC_R_NOSPACE);
1175		*tp++ = *sp++;
1176		tl--;
1177	}
1178	if (tl < 1)
1179		return (ISC_R_NOSPACE);
1180	*tp++ = '"';
1181	tl--;
1182	isc_buffer_add(target, (unsigned int)(tp - (char *)region.base));
1183	isc_region_consume(source, *source->base + 1);
1184	return (ISC_R_SUCCESS);
1185}
1186
1187static isc_result_t
1188txt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
1189	isc_region_t tregion;
1190	isc_boolean_t escape;
1191	unsigned int n, nrem;
1192	char *s;
1193	unsigned char *t;
1194	int d;
1195	int c;
1196
1197	isc_buffer_availableregion(target, &tregion);
1198	s = source->base;
1199	n = source->length;
1200	t = tregion.base;
1201	nrem = tregion.length;
1202	escape = ISC_FALSE;
1203	if (nrem < 1)
1204		return (ISC_R_NOSPACE);
1205	/*
1206	 * Length byte.
1207	 */
1208	nrem--;
1209	t++;
1210	/*
1211	 * Maximum text string length.
1212	 */
1213	if (nrem > 255)
1214		nrem = 255;
1215	while (n-- != 0) {
1216		c = (*s++) & 0xff;
1217		if (escape && (d = decvalue((char)c)) != -1) {
1218			c = d;
1219			if (n == 0)
1220				return (DNS_R_SYNTAX);
1221			n--;
1222			if ((d = decvalue(*s++)) != -1)
1223				c = c * 10 + d;
1224			else
1225				return (DNS_R_SYNTAX);
1226			if (n == 0)
1227				return (DNS_R_SYNTAX);
1228			n--;
1229			if ((d = decvalue(*s++)) != -1)
1230				c = c * 10 + d;
1231			else
1232				return (DNS_R_SYNTAX);
1233			if (c > 255)
1234				return (DNS_R_SYNTAX);
1235		} else if (!escape && c == '\\') {
1236			escape = ISC_TRUE;
1237			continue;
1238		}
1239		escape = ISC_FALSE;
1240		if (nrem == 0)
1241			return ((tregion.length <= 256U) ?
1242				ISC_R_NOSPACE : DNS_R_SYNTAX);
1243		*t++ = c;
1244		nrem--;
1245	}
1246	if (escape)
1247		return (DNS_R_SYNTAX);
1248	*tregion.base = (unsigned char)(t - tregion.base - 1);
1249	isc_buffer_add(target, *tregion.base + 1);
1250	return (ISC_R_SUCCESS);
1251}
1252
1253static isc_result_t
1254txt_fromwire(isc_buffer_t *source, isc_buffer_t *target) {
1255	unsigned int n;
1256	isc_region_t sregion;
1257	isc_region_t tregion;
1258
1259	isc_buffer_activeregion(source, &sregion);
1260	if (sregion.length == 0)
1261		return(ISC_R_UNEXPECTEDEND);
1262	n = *sregion.base + 1;
1263	if (n > sregion.length)
1264		return (ISC_R_UNEXPECTEDEND);
1265
1266	isc_buffer_availableregion(target, &tregion);
1267	if (n > tregion.length)
1268		return (ISC_R_NOSPACE);
1269
1270	if (tregion.base != sregion.base)
1271		memmove(tregion.base, sregion.base, n);
1272	isc_buffer_forward(source, n);
1273	isc_buffer_add(target, n);
1274	return (ISC_R_SUCCESS);
1275}
1276
1277static isc_result_t
1278multitxt_totext(isc_region_t *source, isc_buffer_t *target) {
1279	unsigned int tl;
1280	unsigned int n0, n;
1281	unsigned char *sp;
1282	char *tp;
1283	isc_region_t region;
1284
1285	isc_buffer_availableregion(target, &region);
1286	sp = source->base;
1287	tp = (char *)region.base;
1288	tl = region.length;
1289
1290	if (tl < 1)
1291		return (ISC_R_NOSPACE);
1292	*tp++ = '"';
1293	tl--;
1294	do {
1295		n0 = n = *sp++;
1296
1297		REQUIRE(n0 + 1 <= source->length);
1298
1299		while (n--) {
1300			if (*sp < 0x20 || *sp >= 0x7f) {
1301				if (tl < 4)
1302					return (ISC_R_NOSPACE);
1303				*tp++ = 0x5c;
1304				*tp++ = 0x30 + ((*sp / 100) % 10);
1305				*tp++ = 0x30 + ((*sp / 10) % 10);
1306				*tp++ = 0x30 + (*sp % 10);
1307				sp++;
1308				tl -= 4;
1309				continue;
1310			}
1311			/* double quote, semi-colon, backslash */
1312			if (*sp == 0x22 || *sp == 0x3b || *sp == 0x5c) {
1313				if (tl < 2)
1314					return (ISC_R_NOSPACE);
1315				*tp++ = '\\';
1316				tl--;
1317			}
1318			if (tl < 1)
1319				return (ISC_R_NOSPACE);
1320			*tp++ = *sp++;
1321			tl--;
1322		}
1323		isc_region_consume(source, n0 + 1);
1324	} while (source->length != 0);
1325	if (tl < 1)
1326		return (ISC_R_NOSPACE);
1327	*tp++ = '"';
1328	tl--;
1329	isc_buffer_add(target, (unsigned int)(tp - (char *)region.base));
1330	return (ISC_R_SUCCESS);
1331}
1332
1333static isc_result_t
1334multitxt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
1335	isc_region_t tregion;
1336	isc_boolean_t escape;
1337	unsigned int n, nrem;
1338	char *s;
1339	unsigned char *t0, *t;
1340	int d;
1341	int c;
1342
1343	s = source->base;
1344	n = source->length;
1345	escape = ISC_FALSE;
1346
1347	do {
1348		isc_buffer_availableregion(target, &tregion);
1349		t0 = tregion.base;
1350		nrem = tregion.length;
1351		if (nrem < 1)
1352			return (ISC_R_NOSPACE);
1353		/* length byte */
1354		t = t0;
1355		nrem--;
1356		t++;
1357		/* 255 byte character-string slice */
1358		if (nrem > 255)
1359			nrem = 255;
1360		while (n != 0) {
1361			--n;
1362			c = (*s++) & 0xff;
1363			if (escape && (d = decvalue((char)c)) != -1) {
1364				c = d;
1365				if (n == 0)
1366					return (DNS_R_SYNTAX);
1367				n--;
1368				if ((d = decvalue(*s++)) != -1)
1369					c = c * 10 + d;
1370				else
1371					return (DNS_R_SYNTAX);
1372				if (n == 0)
1373					return (DNS_R_SYNTAX);
1374				n--;
1375				if ((d = decvalue(*s++)) != -1)
1376					c = c * 10 + d;
1377				else
1378					return (DNS_R_SYNTAX);
1379				if (c > 255)
1380					return (DNS_R_SYNTAX);
1381			} else if (!escape && c == '\\') {
1382				escape = ISC_TRUE;
1383				continue;
1384			}
1385			escape = ISC_FALSE;
1386			*t++ = c;
1387			nrem--;
1388			if (nrem == 0)
1389				break;
1390		}
1391		if (escape)
1392			return (DNS_R_SYNTAX);
1393		*t0 = (unsigned char)(t - t0 - 1);
1394		isc_buffer_add(target, *t0 + 1);
1395	} while (n != 0);
1396	return (ISC_R_SUCCESS);
1397}
1398
1399static isc_result_t
1400multitxt_fromwire(isc_buffer_t *source, isc_buffer_t *target) {
1401	unsigned int n;
1402	isc_region_t sregion;
1403	isc_region_t tregion;
1404
1405	isc_buffer_activeregion(source, &sregion);
1406	if (sregion.length == 0)
1407		return(ISC_R_UNEXPECTEDEND);
1408	n = 256U;
1409	do {
1410		if (n != 256U)
1411			return (DNS_R_SYNTAX);
1412		n = *sregion.base + 1;
1413		if (n > sregion.length)
1414			return (ISC_R_UNEXPECTEDEND);
1415
1416		isc_buffer_availableregion(target, &tregion);
1417		if (n > tregion.length)
1418			return (ISC_R_NOSPACE);
1419
1420		if (tregion.base != sregion.base)
1421			memmove(tregion.base, sregion.base, n);
1422		isc_buffer_forward(source, n);
1423		isc_buffer_add(target, n);
1424		isc_buffer_activeregion(source, &sregion);
1425	} while (sregion.length != 0);
1426	return (ISC_R_SUCCESS);
1427}
1428
1429static isc_boolean_t
1430name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target) {
1431	int l1, l2;
1432
1433	if (origin == NULL)
1434		goto return_false;
1435
1436	if (dns_name_compare(origin, dns_rootname) == 0)
1437		goto return_false;
1438
1439	if (!dns_name_issubdomain(name, origin))
1440		goto return_false;
1441
1442	l1 = dns_name_countlabels(name);
1443	l2 = dns_name_countlabels(origin);
1444
1445	if (l1 == l2)
1446		goto return_false;
1447
1448	/* Master files should be case preserving. */
1449	dns_name_getlabelsequence(name, l1 - l2, l2, target);
1450	if (!dns_name_caseequal(origin, target))
1451		goto return_false;
1452
1453	dns_name_getlabelsequence(name, 0, l1 - l2, target);
1454	return (ISC_TRUE);
1455
1456return_false:
1457	*target = *name;
1458	return (ISC_FALSE);
1459}
1460
1461static isc_result_t
1462str_totext(const char *source, isc_buffer_t *target) {
1463	unsigned int l;
1464	isc_region_t region;
1465
1466	isc_buffer_availableregion(target, &region);
1467	l = strlen(source);
1468
1469	if (l > region.length)
1470		return (ISC_R_NOSPACE);
1471
1472	memmove(region.base, source, l);
1473	isc_buffer_add(target, l);
1474	return (ISC_R_SUCCESS);
1475}
1476
1477static isc_result_t
1478inet_totext(int af, isc_region_t *src, isc_buffer_t *target) {
1479	char tmpbuf[64];
1480
1481	/* Note - inet_ntop doesn't do size checking on its input. */
1482	if (inet_ntop(af, src->base, tmpbuf, sizeof(tmpbuf)) == NULL)
1483		return (ISC_R_NOSPACE);
1484	if (strlen(tmpbuf) > isc_buffer_availablelength(target))
1485		return (ISC_R_NOSPACE);
1486	isc_buffer_putstr(target, tmpbuf);
1487	return (ISC_R_SUCCESS);
1488}
1489
1490static isc_boolean_t
1491buffer_empty(isc_buffer_t *source) {
1492	return((source->current == source->active) ? ISC_TRUE : ISC_FALSE);
1493}
1494
1495static void
1496buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region) {
1497	isc_buffer_init(buffer, region->base, region->length);
1498	isc_buffer_add(buffer, region->length);
1499	isc_buffer_setactive(buffer, region->length);
1500}
1501
1502static isc_result_t
1503uint32_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1504	isc_region_t region;
1505
1506	isc_buffer_availableregion(target, &region);
1507	if (region.length < 4)
1508		return (ISC_R_NOSPACE);
1509	isc_buffer_putuint32(target, value);
1510	return (ISC_R_SUCCESS);
1511}
1512
1513static isc_result_t
1514uint16_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1515	isc_region_t region;
1516
1517	if (value > 0xffff)
1518		return (ISC_R_RANGE);
1519	isc_buffer_availableregion(target, &region);
1520	if (region.length < 2)
1521		return (ISC_R_NOSPACE);
1522	isc_buffer_putuint16(target, (isc_uint16_t)value);
1523	return (ISC_R_SUCCESS);
1524}
1525
1526static isc_result_t
1527uint8_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1528	isc_region_t region;
1529
1530	if (value > 0xff)
1531		return (ISC_R_RANGE);
1532	isc_buffer_availableregion(target, &region);
1533	if (region.length < 1)
1534		return (ISC_R_NOSPACE);
1535	isc_buffer_putuint8(target, (isc_uint8_t)value);
1536	return (ISC_R_SUCCESS);
1537}
1538
1539static isc_result_t
1540name_tobuffer(dns_name_t *name, isc_buffer_t *target) {
1541	isc_region_t r;
1542	dns_name_toregion(name, &r);
1543	return (isc_buffer_copyregion(target, &r));
1544}
1545
1546static isc_uint32_t
1547uint32_fromregion(isc_region_t *region) {
1548	isc_uint32_t value;
1549
1550	REQUIRE(region->length >= 4);
1551	value = region->base[0] << 24;
1552	value |= region->base[1] << 16;
1553	value |= region->base[2] << 8;
1554	value |= region->base[3];
1555	return(value);
1556}
1557
1558static isc_uint16_t
1559uint16_consume_fromregion(isc_region_t *region) {
1560	isc_uint16_t r = uint16_fromregion(region);
1561
1562	isc_region_consume(region, 2);
1563	return r;
1564}
1565
1566static isc_uint16_t
1567uint16_fromregion(isc_region_t *region) {
1568
1569	REQUIRE(region->length >= 2);
1570
1571	return ((region->base[0] << 8) | region->base[1]);
1572}
1573
1574static isc_uint8_t
1575uint8_fromregion(isc_region_t *region) {
1576
1577	REQUIRE(region->length >= 1);
1578
1579	return (region->base[0]);
1580}
1581
1582static isc_uint8_t
1583uint8_consume_fromregion(isc_region_t *region) {
1584	isc_uint8_t r = uint8_fromregion(region);
1585
1586	isc_region_consume(region, 1);
1587	return r;
1588}
1589
1590static isc_result_t
1591mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
1592	isc_region_t tr;
1593
1594	isc_buffer_availableregion(target, &tr);
1595	if (length > tr.length)
1596		return (ISC_R_NOSPACE);
1597	if (tr.base != base)
1598		memmove(tr.base, base, length);
1599	isc_buffer_add(target, length);
1600	return (ISC_R_SUCCESS);
1601}
1602
1603static int
1604hexvalue(char value) {
1605	char *s;
1606	unsigned char c;
1607
1608	c = (unsigned char)value;
1609
1610	if (!isascii(c))
1611		return (-1);
1612	if (isupper(c))
1613		c = tolower(c);
1614	if ((s = strchr(hexdigits, c)) == NULL)
1615		return (-1);
1616	return (int)(s - hexdigits);
1617}
1618
1619static int
1620decvalue(char value) {
1621	char *s;
1622
1623	/*
1624	 * isascii() is valid for full range of int values, no need to
1625	 * mask or cast.
1626	 */
1627	if (!isascii(value))
1628		return (-1);
1629	if ((s = strchr(decdigits, value)) == NULL)
1630		return (-1);
1631	return (int)(s - decdigits);
1632}
1633
1634static const char atob_digits[86] =
1635	"!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`" \
1636	"abcdefghijklmnopqrstu";
1637/*
1638 * Subroutines to convert between 8 bit binary bytes and printable ASCII.
1639 * Computes the number of bytes, and three kinds of simple checksums.
1640 * Incoming bytes are collected into 32-bit words, then printed in base 85:
1641 *	exp(85,5) > exp(2,32)
1642 * The ASCII characters used are between '!' and 'u';
1643 * 'z' encodes 32-bit zero; 'x' is used to mark the end of encoded data.
1644 *
1645 * Originally by Paul Rutter (philabs!per) and Joe Orost (petsd!joe) for
1646 * the atob/btoa programs, released with the compress program, in mod.sources.
1647 * Modified by Mike Schwartz 8/19/86 for use in BIND.
1648 * Modified to be re-entrant 3/2/99.
1649 */
1650
1651
1652struct state {
1653	isc_int32_t Ceor;
1654	isc_int32_t Csum;
1655	isc_int32_t Crot;
1656	isc_int32_t word;
1657	isc_int32_t bcount;
1658};
1659
1660#define Ceor state->Ceor
1661#define Csum state->Csum
1662#define Crot state->Crot
1663#define word state->word
1664#define bcount state->bcount
1665
1666#define times85(x)	((((((x<<2)+x)<<2)+x)<<2)+x)
1667
1668static isc_result_t	byte_atob(int c, isc_buffer_t *target,
1669				  struct state *state);
1670static isc_result_t	putbyte(int c, isc_buffer_t *, struct state *state);
1671static isc_result_t	byte_btoa(int c, isc_buffer_t *, struct state *state);
1672
1673/*
1674 * Decode ASCII-encoded byte c into binary representation and
1675 * place into *bufp, advancing bufp.
1676 */
1677static isc_result_t
1678byte_atob(int c, isc_buffer_t *target, struct state *state) {
1679	char *s;
1680	if (c == 'z') {
1681		if (bcount != 0)
1682			return(DNS_R_SYNTAX);
1683		else {
1684			RETERR(putbyte(0, target, state));
1685			RETERR(putbyte(0, target, state));
1686			RETERR(putbyte(0, target, state));
1687			RETERR(putbyte(0, target, state));
1688		}
1689	} else if ((s = strchr(atob_digits, c)) != NULL) {
1690		if (bcount == 0) {
1691			word = (isc_int32_t)(s - atob_digits);
1692			++bcount;
1693		} else if (bcount < 4) {
1694			word = times85(word);
1695			word += (isc_int32_t)(s - atob_digits);
1696			++bcount;
1697		} else {
1698			word = times85(word);
1699			word += (isc_int32_t)(s - atob_digits);
1700			RETERR(putbyte((word >> 24) & 0xff, target, state));
1701			RETERR(putbyte((word >> 16) & 0xff, target, state));
1702			RETERR(putbyte((word >> 8) & 0xff, target, state));
1703			RETERR(putbyte(word & 0xff, target, state));
1704			word = 0;
1705			bcount = 0;
1706		}
1707	} else
1708		return(DNS_R_SYNTAX);
1709	return(ISC_R_SUCCESS);
1710}
1711
1712/*
1713 * Compute checksum info and place c into target.
1714 */
1715static isc_result_t
1716putbyte(int c, isc_buffer_t *target, struct state *state) {
1717	isc_region_t tr;
1718
1719	Ceor ^= c;
1720	Csum += c;
1721	Csum += 1;
1722	if ((Crot & 0x80000000)) {
1723		Crot <<= 1;
1724		Crot += 1;
1725	} else {
1726		Crot <<= 1;
1727	}
1728	Crot += c;
1729	isc_buffer_availableregion(target, &tr);
1730	if (tr.length < 1)
1731		return (ISC_R_NOSPACE);
1732	tr.base[0] = c;
1733	isc_buffer_add(target, 1);
1734	return (ISC_R_SUCCESS);
1735}
1736
1737/*
1738 * Read the ASCII-encoded data from inbuf, of length inbuflen, and convert
1739 * it into T_UNSPEC (binary data) in outbuf, not to exceed outbuflen bytes;
1740 * outbuflen must be divisible by 4.  (Note: this is because outbuf is filled
1741 * in 4 bytes at a time.  If the actual data doesn't end on an even 4-byte
1742 * boundary, there will be no problem...it will be padded with 0 bytes, and
1743 * numbytes will indicate the correct number of bytes.  The main point is
1744 * that since the buffer is filled in 4 bytes at a time, even if there is
1745 * not a full 4 bytes of data at the end, there has to be room to 0-pad the
1746 * data, so the buffer must be of size divisible by 4).  Place the number of
1747 * output bytes in numbytes, and return a failure/success status.
1748 */
1749
1750static isc_result_t
1751atob_tobuffer(isc_lex_t *lexer, isc_buffer_t *target) {
1752	long oeor, osum, orot;
1753	struct state statebuf, *state= &statebuf;
1754	isc_token_t token;
1755	char c;
1756	char *e;
1757
1758	Ceor = Csum = Crot = word = bcount = 0;
1759
1760	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
1761				      ISC_FALSE));
1762	while (token.value.as_textregion.length != 0) {
1763		if ((c = token.value.as_textregion.base[0]) == 'x') {
1764			break;
1765		} else
1766			RETERR(byte_atob(c, target, state));
1767		isc_textregion_consume(&token.value.as_textregion, 1);
1768	}
1769
1770	/*
1771	 * Number of bytes.
1772	 */
1773	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
1774				      ISC_FALSE));
1775	if ((token.value.as_ulong % 4) != 0U)
1776		isc_buffer_subtract(target,  4 - (token.value.as_ulong % 4));
1777
1778	/*
1779	 * Checksum.
1780	 */
1781	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
1782				      ISC_FALSE));
1783	oeor = strtol(DNS_AS_STR(token), &e, 16);
1784	if (*e != 0)
1785		return (DNS_R_SYNTAX);
1786
1787	/*
1788	 * Checksum.
1789	 */
1790	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
1791				      ISC_FALSE));
1792	osum = strtol(DNS_AS_STR(token), &e, 16);
1793	if (*e != 0)
1794		return (DNS_R_SYNTAX);
1795
1796	/*
1797	 * Checksum.
1798	 */
1799	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
1800				      ISC_FALSE));
1801	orot = strtol(DNS_AS_STR(token), &e, 16);
1802	if (*e != 0)
1803		return (DNS_R_SYNTAX);
1804
1805	if ((oeor != Ceor) || (osum != Csum) || (orot != Crot))
1806		return(DNS_R_BADCKSUM);
1807	return (ISC_R_SUCCESS);
1808}
1809
1810/*
1811 * Encode binary byte c into ASCII representation and place into *bufp,
1812 * advancing bufp.
1813 */
1814static isc_result_t
1815byte_btoa(int c, isc_buffer_t *target, struct state *state) {
1816	isc_region_t tr;
1817
1818	isc_buffer_availableregion(target, &tr);
1819	Ceor ^= c;
1820	Csum += c;
1821	Csum += 1;
1822	if ((Crot & 0x80000000)) {
1823		Crot <<= 1;
1824		Crot += 1;
1825	} else {
1826		Crot <<= 1;
1827	}
1828	Crot += c;
1829
1830	word <<= 8;
1831	word |= c;
1832	if (bcount == 3) {
1833		if (word == 0) {
1834			if (tr.length < 1)
1835				return (ISC_R_NOSPACE);
1836			tr.base[0] = 'z';
1837			isc_buffer_add(target, 1);
1838		} else {
1839		    register int tmp = 0;
1840		    register isc_int32_t tmpword = word;
1841
1842		    if (tmpword < 0) {
1843			   /*
1844			    * Because some don't support u_long.
1845			    */
1846			tmp = 32;
1847			tmpword -= (isc_int32_t)(85 * 85 * 85 * 85 * 32);
1848		    }
1849		    if (tmpword < 0) {
1850			tmp = 64;
1851			tmpword -= (isc_int32_t)(85 * 85 * 85 * 85 * 32);
1852		    }
1853			if (tr.length < 5)
1854				return (ISC_R_NOSPACE);
1855			tr.base[0] = atob_digits[(tmpword /
1856					      (isc_int32_t)(85 * 85 * 85 * 85))
1857						+ tmp];
1858			tmpword %= (isc_int32_t)(85 * 85 * 85 * 85);
1859			tr.base[1] = atob_digits[tmpword / (85 * 85 * 85)];
1860			tmpword %= (85 * 85 * 85);
1861			tr.base[2] = atob_digits[tmpword / (85 * 85)];
1862			tmpword %= (85 * 85);
1863			tr.base[3] = atob_digits[tmpword / 85];
1864			tmpword %= 85;
1865			tr.base[4] = atob_digits[tmpword];
1866			isc_buffer_add(target, 5);
1867		}
1868		bcount = 0;
1869	} else {
1870		bcount += 1;
1871	}
1872	return (ISC_R_SUCCESS);
1873}
1874
1875
1876/*
1877 * Encode the binary data from inbuf, of length inbuflen, into a
1878 * target.  Return success/failure status
1879 */
1880static isc_result_t
1881btoa_totext(unsigned char *inbuf, int inbuflen, isc_buffer_t *target) {
1882	int inc;
1883	struct state statebuf, *state = &statebuf;
1884	char buf[sizeof("x 2000000000 ffffffff ffffffff ffffffff")];
1885
1886	Ceor = Csum = Crot = word = bcount = 0;
1887	for (inc = 0; inc < inbuflen; inbuf++, inc++)
1888		RETERR(byte_btoa(*inbuf, target, state));
1889
1890	while (bcount != 0)
1891		RETERR(byte_btoa(0, target, state));
1892
1893	/*
1894	 * Put byte count and checksum information at end of buffer,
1895	 * delimited by 'x'
1896	 */
1897	snprintf(buf, sizeof(buf), "x %d %x %x %x", inbuflen, Ceor, Csum, Crot);
1898	return (str_totext(buf, target));
1899}
1900
1901
1902static void
1903default_fromtext_callback(dns_rdatacallbacks_t *callbacks, const char *fmt,
1904			  ...)
1905{
1906	va_list ap;
1907
1908	UNUSED(callbacks);
1909
1910	va_start(ap, fmt);
1911	vfprintf(stderr, fmt, ap);
1912	va_end(ap);
1913	fprintf(stderr, "\n");
1914}
1915
1916static void
1917fromtext_warneof(isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks) {
1918	if (isc_lex_isfile(lexer) && callbacks != NULL) {
1919		const char *name = isc_lex_getsourcename(lexer);
1920		if (name == NULL)
1921			name = "UNKNOWN";
1922		(*callbacks->warn)(callbacks,
1923				   "%s:%lu: file does not end with newline",
1924				   name, isc_lex_getsourceline(lexer));
1925	}
1926}
1927
1928static void
1929warn_badmx(isc_token_t *token, isc_lex_t *lexer,
1930	   dns_rdatacallbacks_t *callbacks)
1931{
1932	const char *file;
1933	unsigned long line;
1934
1935	if (lexer != NULL) {
1936		file = isc_lex_getsourcename(lexer);
1937		line = isc_lex_getsourceline(lexer);
1938		(*callbacks->warn)(callbacks, "%s:%u: warning: '%s': %s",
1939				   file, line, DNS_AS_STR(*token),
1940				   dns_result_totext(DNS_R_MXISADDRESS));
1941	}
1942}
1943
1944static void
1945warn_badname(dns_name_t *name, isc_lex_t *lexer,
1946	     dns_rdatacallbacks_t *callbacks)
1947{
1948	const char *file;
1949	unsigned long line;
1950	char namebuf[DNS_NAME_FORMATSIZE];
1951
1952	if (lexer != NULL) {
1953		file = isc_lex_getsourcename(lexer);
1954		line = isc_lex_getsourceline(lexer);
1955		dns_name_format(name, namebuf, sizeof(namebuf));
1956		(*callbacks->warn)(callbacks, "%s:%u: warning: %s: %s",
1957				   file, line, namebuf,
1958				   dns_result_totext(DNS_R_BADNAME));
1959	}
1960}
1961
1962static void
1963fromtext_error(void (*callback)(dns_rdatacallbacks_t *, const char *, ...),
1964	       dns_rdatacallbacks_t *callbacks, const char *name,
1965	       unsigned long line, isc_token_t *token, isc_result_t result)
1966{
1967	if (name == NULL)
1968		name = "UNKNOWN";
1969
1970	if (token != NULL) {
1971		switch (token->type) {
1972		case isc_tokentype_eol:
1973			(*callback)(callbacks, "%s: %s:%lu: near eol: %s",
1974				    "dns_rdata_fromtext", name, line,
1975				    dns_result_totext(result));
1976			break;
1977		case isc_tokentype_eof:
1978			(*callback)(callbacks, "%s: %s:%lu: near eof: %s",
1979				    "dns_rdata_fromtext", name, line,
1980				    dns_result_totext(result));
1981			break;
1982		case isc_tokentype_number:
1983			(*callback)(callbacks, "%s: %s:%lu: near %lu: %s",
1984				    "dns_rdata_fromtext", name, line,
1985				    token->value.as_ulong,
1986				    dns_result_totext(result));
1987			break;
1988		case isc_tokentype_string:
1989		case isc_tokentype_qstring:
1990			(*callback)(callbacks, "%s: %s:%lu: near '%s': %s",
1991				    "dns_rdata_fromtext", name, line,
1992				    DNS_AS_STR(*token),
1993				    dns_result_totext(result));
1994			break;
1995		default:
1996			(*callback)(callbacks, "%s: %s:%lu: %s",
1997				    "dns_rdata_fromtext", name, line,
1998				    dns_result_totext(result));
1999			break;
2000		}
2001	} else {
2002		(*callback)(callbacks, "dns_rdata_fromtext: %s:%lu: %s",
2003			    name, line, dns_result_totext(result));
2004	}
2005}
2006
2007dns_rdatatype_t
2008dns_rdata_covers(dns_rdata_t *rdata) {
2009	if (rdata->type == 46)
2010		return (covers_rrsig(rdata));
2011	return (covers_sig(rdata));
2012}
2013
2014isc_boolean_t
2015dns_rdatatype_ismeta(dns_rdatatype_t type) {
2016	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_META) != 0)
2017		return (ISC_TRUE);
2018	return (ISC_FALSE);
2019}
2020
2021isc_boolean_t
2022dns_rdatatype_issingleton(dns_rdatatype_t type) {
2023	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_SINGLETON)
2024	    != 0)
2025		return (ISC_TRUE);
2026	return (ISC_FALSE);
2027}
2028
2029isc_boolean_t
2030dns_rdatatype_notquestion(dns_rdatatype_t type) {
2031	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_NOTQUESTION)
2032	    != 0)
2033		return (ISC_TRUE);
2034	return (ISC_FALSE);
2035}
2036
2037isc_boolean_t
2038dns_rdatatype_questiononly(dns_rdatatype_t type) {
2039	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_QUESTIONONLY)
2040	    != 0)
2041		return (ISC_TRUE);
2042	return (ISC_FALSE);
2043}
2044
2045isc_boolean_t
2046dns_rdatatype_atparent(dns_rdatatype_t type) {
2047	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_ATPARENT) != 0)
2048		return (ISC_TRUE);
2049	return (ISC_FALSE);
2050}
2051
2052isc_boolean_t
2053dns_rdataclass_ismeta(dns_rdataclass_t rdclass) {
2054
2055	if (rdclass == dns_rdataclass_reserved0
2056	    || rdclass == dns_rdataclass_none
2057	    || rdclass == dns_rdataclass_any)
2058		return (ISC_TRUE);
2059
2060	return (ISC_FALSE);  /* Assume it is not a meta class. */
2061}
2062
2063isc_boolean_t
2064dns_rdatatype_isdnssec(dns_rdatatype_t type) {
2065	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_DNSSEC) != 0)
2066		return (ISC_TRUE);
2067	return (ISC_FALSE);
2068}
2069
2070isc_boolean_t
2071dns_rdatatype_iszonecutauth(dns_rdatatype_t type) {
2072	if ((dns_rdatatype_attributes(type)
2073	     & (DNS_RDATATYPEATTR_DNSSEC | DNS_RDATATYPEATTR_ZONECUTAUTH))
2074	    != 0)
2075		return (ISC_TRUE);
2076	return (ISC_FALSE);
2077}
2078
2079isc_boolean_t
2080dns_rdatatype_isknown(dns_rdatatype_t type) {
2081	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_UNKNOWN)
2082	    == 0)
2083		return (ISC_TRUE);
2084	return (ISC_FALSE);
2085}
2086
2087void
2088dns_rdata_exists(dns_rdata_t *rdata, dns_rdatatype_t type) {
2089
2090	REQUIRE(rdata != NULL);
2091	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2092
2093	rdata->data = NULL;
2094	rdata->length = 0;
2095	rdata->flags = DNS_RDATA_UPDATE;
2096	rdata->type = type;
2097	rdata->rdclass = dns_rdataclass_any;
2098}
2099
2100void
2101dns_rdata_notexist(dns_rdata_t *rdata, dns_rdatatype_t type) {
2102
2103	REQUIRE(rdata != NULL);
2104	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2105
2106	rdata->data = NULL;
2107	rdata->length = 0;
2108	rdata->flags = DNS_RDATA_UPDATE;
2109	rdata->type = type;
2110	rdata->rdclass = dns_rdataclass_none;
2111}
2112
2113void
2114dns_rdata_deleterrset(dns_rdata_t *rdata, dns_rdatatype_t type) {
2115
2116	REQUIRE(rdata != NULL);
2117	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2118
2119	rdata->data = NULL;
2120	rdata->length = 0;
2121	rdata->flags = DNS_RDATA_UPDATE;
2122	rdata->type = type;
2123	rdata->rdclass = dns_rdataclass_any;
2124}
2125
2126void
2127dns_rdata_makedelete(dns_rdata_t *rdata) {
2128	REQUIRE(rdata != NULL);
2129
2130	rdata->rdclass = dns_rdataclass_none;
2131}
2132
2133const char *
2134dns_rdata_updateop(dns_rdata_t *rdata, dns_section_t section) {
2135
2136	REQUIRE(rdata != NULL);
2137	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2138
2139	switch (section) {
2140	case DNS_SECTION_PREREQUISITE:
2141		switch (rdata->rdclass) {
2142		case dns_rdataclass_none:
2143			switch (rdata->type) {
2144			case dns_rdatatype_any:
2145				return ("domain doesn't exist");
2146			default:
2147				return ("rrset doesn't exist");
2148			}
2149		case dns_rdataclass_any:
2150			switch (rdata->type) {
2151			case dns_rdatatype_any:
2152				return ("domain exists");
2153			default:
2154				return ("rrset exists (value independent)");
2155			}
2156		default:
2157			return ("rrset exists (value dependent)");
2158		}
2159	case DNS_SECTION_UPDATE:
2160		switch (rdata->rdclass) {
2161		case dns_rdataclass_none:
2162			return ("delete");
2163		case dns_rdataclass_any:
2164			switch (rdata->type) {
2165			case dns_rdatatype_any:
2166				return ("delete all rrsets");
2167			default:
2168				return ("delete rrset");
2169			}
2170		default:
2171			return ("add");
2172		}
2173	}
2174	return ("invalid");
2175}
2176