message.h 30.8 KB
Newer Older
1
/*
Bob Halley's avatar
Bob Halley committed
2
 * Copyright (C) 1999, 2000  Internet Software Consortium.
3
 *
4 5 6
 * 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.
7
 *
8 9 10 11 12 13 14 15
 * 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.
16 17
 */

Brian Wellington's avatar
Brian Wellington committed
18
/* $Id: message.h,v 1.82 2000/11/13 20:12:03 bwelling Exp $ */
David Lawrence's avatar
David Lawrence committed
19

20 21
#ifndef DNS_MESSAGE_H
#define DNS_MESSAGE_H 1
22 23 24 25 26

/***
 ***	Imports
 ***/

27 28
#include <isc/lang.h>
#include <isc/magic.h>
29

Michael Graff's avatar
Michael Graff committed
30
#include <dns/compress.h>
31
#include <dns/types.h>
32

33 34
#include <dst/dst.h>

35 36 37
/*
 * How this beast works:
 *
38
 * When a dns message is received in a buffer, dns_message_fromwire() is called
39 40 41 42 43
 * on the memory region.  Various items are checked including the format
 * of the message (if counts are right, if counts consume the entire sections,
 * and if sections consume the entire message) and known pseudo-RRs in the
 * additional data section are analyzed and removed.
 *
Brian Wellington's avatar
Brian Wellington committed
44 45
 * TSIG checking is also done at this layer, and any DNSSEC transaction
 * signatures should also be checked here.
46 47 48 49
 *
 * Notes on using the gettemp*() and puttemp*() functions:
 *
 * These functions return items (names, rdatasets, etc) allocated from some
50 51 52 53
 * internal state of the dns_message_t.
 *
 * Names and rdatasets must be put back into the dns_message_t in
 * one of two ways.  Assume a name was allocated via
54 55 56 57 58 59
 * dns_message_gettempname():
 *
 *	(1) insert it into a section, using dns_message_addname().
 *
 *	(2) return it to the message using dns_message_puttempname().
 *
60 61 62 63 64 65 66
 * The same applies to rdatasets.
 *
 * On the other hand, rdatalists and rdatas allocated using
 * dns_message_gettemp*() will always be freed automatically
 * when the message is reset or destroyed; calling dns_message_puttemp*()
 * on these is optional and serves only to enable the item to be reused
 * multiple times during the lifetime of the message.
67 68 69 70 71 72 73 74
 *
 * Buffers allocated using isc_buffer_allocate() can be automatically freed
 * as well by giving the buffer to the message using dns_message_takebuffer().
 * Doing this will cause the buffer to be freed using isc_buffer_free()
 * when the section lists are cleared, such as in a reset or in a destroy.
 * Since the buffer itself exists until the message is destroyed, this sort
 * of code can be written:
 *
75
 *	buffer = isc_buffer_allocate(mctx, 512);
76 77 78 79 80 81 82 83 84 85
 *	name = NULL;
 *	name = dns_message_gettempname(message, &name);
 *	dns_name_init(name, NULL);
 *	result = dns_name_fromtext(name, &source, dns_rootname, ISC_FALSE,
 *				   buffer);
 *	dns_message_takebuffer(message, &buffer);
 *
 *
 * TODO:
 *
Brian Wellington's avatar
Brian Wellington committed
86 87
 * XXX Needed:  ways to set and retrieve EDNS information, add rdata to a
 * section, move rdata from one section to another, remove rdata, etc.
88 89
 */

90 91 92 93 94
#define DNS_MESSAGEFLAG_QR		0x8000U
#define DNS_MESSAGEFLAG_AA		0x0400U
#define DNS_MESSAGEFLAG_TC		0x0200U
#define DNS_MESSAGEFLAG_RD		0x0100U
#define DNS_MESSAGEFLAG_RA		0x0080U
Bob Halley's avatar
Bob Halley committed
95 96
#define DNS_MESSAGEFLAG_AD		0x0020U
#define DNS_MESSAGEFLAG_CD		0x0010U
97

Bob Halley's avatar
Bob Halley committed
98
#define DNS_MESSAGE_REPLYPRESERVE	(DNS_MESSAGEFLAG_RD)
99

Bob Halley's avatar
Bob Halley committed
100 101 102
#define DNS_MESSAGE_HEADERLEN		12 /* 6 isc_uint16_t's */

#define DNS_MESSAGE_MAGIC		0x4d534740U	/* MSG@ */
Michael Graff's avatar
Michael Graff committed
103
#define DNS_MESSAGE_VALID(msg)		ISC_MAGIC_VALID(msg, DNS_MESSAGE_MAGIC)
Michael Graff's avatar
Michael Graff committed
104

Michael Graff's avatar
Michael Graff committed
105 106 107 108
/*
 * Ordering here matters.  DNS_SECTION_ANY must be the lowest and negative,
 * and DNS_SECTION_MAX must be one greater than the last used section.
 */
Michael Graff's avatar
Michael Graff committed
109
typedef int dns_section_t;
Michael Graff's avatar
Michael Graff committed
110
#define DNS_SECTION_ANY			(-1)
Michael Graff's avatar
Michael Graff committed
111 112 113 114
#define DNS_SECTION_QUESTION		0
#define DNS_SECTION_ANSWER		1
#define DNS_SECTION_AUTHORITY		2
#define DNS_SECTION_ADDITIONAL		3
115
#define DNS_SECTION_MAX			4
116

117 118 119 120 121 122 123
typedef int dns_pseudosection_t;
#define DNS_PSEUDOSECTION_ANY		(-1)
#define DNS_PSEUDOSECTION_OPT           0
#define DNS_PSEUDOSECTION_TSIG          1
#define DNS_PSEUDOSECTION_SIG0          2
#define DNS_PSEUDOSECTION_MAX           3

124 125 126 127
typedef int dns_messagetextflag_t;
#define DNS_MESSAGETEXTFLAG_NOCOMMENTS	0x0001
#define DNS_MESSAGETEXTFLAG_NOHEADERS	0x0002
#define DNS_MESSAGETEXTFLAG_OMITDOT	0x0004
128

129
/*
Andreas Gustafsson's avatar
Andreas Gustafsson committed
130
 * Dynamic update names for these sections.
131 132 133 134
 */
#define DNS_SECTION_ZONE		DNS_SECTION_QUESTION
#define DNS_SECTION_PREREQUISITE	DNS_SECTION_ANSWER
#define DNS_SECTION_UPDATE		DNS_SECTION_AUTHORITY
Michael Graff's avatar
Michael Graff committed
135 136

/*
Michael Graff's avatar
Michael Graff committed
137
 * These tell the message library how the created dns_message_t will be used.
Michael Graff's avatar
Michael Graff committed
138
 */
Michael Graff's avatar
Michael Graff committed
139 140 141
#define DNS_MESSAGE_INTENTUNKNOWN	0 /* internal use only */
#define DNS_MESSAGE_INTENTPARSE		1 /* parsing messages */
#define DNS_MESSAGE_INTENTRENDER	2 /* rendering */
Michael Graff's avatar
Michael Graff committed
142

143 144 145 146 147 148 149 150
/*
 * Control behavior of parsing
 */
#define DNS_MESSAGEPARSE_PRESERVEORDER	0x0001	/* preserve rdata order */
#define DNS_MESSAGEPARSE_BESTEFFORT	0x0002	/* return a message if a
						   recoverable parse error
						   occurs */

Michael Graff's avatar
Michael Graff committed
151 152 153 154 155
/*
 * Control behavior of rendering
 */
#define DNS_MESSAGERENDER_ORDERED	0x0001	/* don't change order */

Michael Graff's avatar
Michael Graff committed
156 157
typedef struct dns_msgblock dns_msgblock_t;

Bob Halley's avatar
Bob Halley committed
158
struct dns_message {
Michael Graff's avatar
Michael Graff committed
159
	/* public from here down */
Michael Graff's avatar
Michael Graff committed
160
	unsigned int			magic;
161

162
	dns_messageid_t			id;
Michael Graff's avatar
Michael Graff committed
163 164 165
	unsigned int			flags;
	unsigned int			rcode;
	unsigned int			opcode;
Michael Graff's avatar
Michael Graff committed
166
	dns_rdataclass_t		rdclass;
Michael Graff's avatar
Michael Graff committed
167

168
	/* 4 real, 1 pseudo */
Michael Graff's avatar
Michael Graff committed
169
	unsigned int			counts[DNS_SECTION_MAX];
Michael Graff's avatar
Michael Graff committed
170 171

	/* private from here down */
Michael Graff's avatar
Michael Graff committed
172 173
	dns_namelist_t			sections[DNS_SECTION_MAX];
	dns_name_t		       *cursors[DNS_SECTION_MAX];
Bob Halley's avatar
Bob Halley committed
174
	dns_rdataset_t		       *opt;
175
	dns_rdataset_t		       *sig0;
176
	dns_rdataset_t		       *tsig;
177

Michael Graff's avatar
Michael Graff committed
178
	int				state;
Michael Graff's avatar
Michael Graff committed
179
	unsigned int			from_to_wire : 2;
180
	unsigned int			need_cctx_cleanup : 1;
Bob Halley's avatar
Bob Halley committed
181 182
	unsigned int			header_ok : 1;
	unsigned int			question_ok : 1;
183
	unsigned int			tcp_continuation : 1;
184 185
	unsigned int			verified_sig : 1;
	unsigned int			verify_attempted : 1;
186

187
	unsigned int			opt_reserved;
188
	unsigned int			sig_reserved;
189
	unsigned int			reserved; /* reserved space (render) */
190

191
	isc_buffer_t		       *buffer;
Michael Graff's avatar
Michael Graff committed
192
	dns_compress_t			cctx;
193

Michael Graff's avatar
Michael Graff committed
194
	isc_mem_t		       *mctx;
195 196 197
	isc_mempool_t		       *namepool;
	isc_mempool_t		       *rdspool;

198
	isc_bufferlist_t		scratchpad;
199 200
	isc_bufferlist_t		cleanup;

Michael Graff's avatar
Michael Graff committed
201 202
	ISC_LIST(dns_msgblock_t)	rdatas;
	ISC_LIST(dns_msgblock_t)	rdatalists;
203 204 205

	ISC_LIST(dns_rdata_t)		freerdata;
	ISC_LIST(dns_rdatalist_t)	freerdatalist;
206 207 208

	dns_rcode_t			tsigstatus;
	dns_rcode_t			querytsigstatus;
209
	dns_name_t		       *tsigname;
210
	dns_rdataset_t		       *querytsig;
211
	dns_tsigkey_t		       *tsigkey;
Brian Wellington's avatar
Brian Wellington committed
212
	dst_context_t		       *tsigctx;
213 214
	int				sigstart;

215
	dns_name_t		       *sig0name;
216 217 218
	dst_key_t		       *sig0key;
	dns_rcode_t			sig0status;
	isc_region_t		       *query;
Brian Wellington's avatar
Brian Wellington committed
219
	isc_region_t		       *saved;
220
	isc_buffer_t		       *rawmessge;
221 222 223

	dns_rdatasetorderfunc_t		order;
	void *				order_arg;
Bob Halley's avatar
Bob Halley committed
224
};
225

226 227 228 229 230 231
/***
 *** Functions
 ***/

ISC_LANG_BEGINDECLS

232
isc_result_t
233
dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp);
234

235
/*
Michael Graff's avatar
Michael Graff committed
236
 * Create msg structure.
237
 *
Michael Graff's avatar
Michael Graff committed
238
 * This function will allocate some internal blocks of memory that are
Michael Graff's avatar
Michael Graff committed
239
 * expected to be needed for parsing or rendering nearly any type of message.
Michael Graff's avatar
Michael Graff committed
240 241 242
 *
 * Requires:
 *	'mctx' be a valid memory context.
243
 *
Michael Graff's avatar
Michael Graff committed
244
 *	'msgp' be non-null and '*msg' be NULL.
Michael Graff's avatar
Michael Graff committed
245
 *
Andreas Gustafsson's avatar
typo  
Andreas Gustafsson committed
246 247
 *	'intent' must be one of DNS_MESSAGE_INTENTPARSE or
 *	DNS_MESSAGE_INTENTRENDER.
Michael Graff's avatar
Michael Graff committed
248 249
 *
 * Ensures:
Michael Graff's avatar
Michael Graff committed
250
 *	The data in "*msg" is set to indicate an unused and empty msg
Michael Graff's avatar
Michael Graff committed
251 252 253
 *	structure.
 *
 * Returns:
254 255
 *	ISC_R_NOMEMORY		-- out of memory
 *	ISC_R_SUCCESS		-- success
256 257
 */

Michael Graff's avatar
Michael Graff committed
258
void
Bob Halley's avatar
Bob Halley committed
259
dns_message_reset(dns_message_t *msg, unsigned int intent);
Michael Graff's avatar
Michael Graff committed
260 261 262 263 264 265
/*
 * Reset a message structure to default state.  All internal lists are freed
 * or reset to a default state as well.  This is simply a more efficient
 * way to call dns_message_destroy() followed by dns_message_allocate(),
 * since it avoid many memory allocations.
 *
Michael Graff's avatar
Michael Graff committed
266 267 268
 * If any data loanouts (buffers, names, rdatas, etc) were requested,
 * the caller must no longer use them after this call.
 *
Bob Halley's avatar
Bob Halley committed
269 270
 * The intended next use of the message will be 'intent'.
 *
Michael Graff's avatar
Michael Graff committed
271 272 273
 * Requires:
 *
 *	'msg' be valid.
Bob Halley's avatar
Bob Halley committed
274 275
 *
 *	'intent' is DNS_MESSAGE_INTENTPARSE or DNS_MESSAGE_INTENTRENDER
Michael Graff's avatar
Michael Graff committed
276
 */
Michael Graff's avatar
Michael Graff committed
277

Michael Graff's avatar
Michael Graff committed
278
void
Michael Graff's avatar
Michael Graff committed
279
dns_message_destroy(dns_message_t **msgp);
Michael Graff's avatar
Michael Graff committed
280
/*
Michael Graff's avatar
Michael Graff committed
281 282 283 284
 * Destroy all state in the message.
 *
 * Requires:
 *
Michael Graff's avatar
Michael Graff committed
285
 *	'msgp' be valid.
Michael Graff's avatar
Michael Graff committed
286 287
 *
 * Ensures:
Michael Graff's avatar
Michael Graff committed
288
 *	'*msgp' == NULL
Michael Graff's avatar
Michael Graff committed
289 290
 */

291 292
isc_result_t
dns_message_sectiontotext(dns_message_t *msg, dns_section_t section,
293
			  dns_messagetextflag_t flags,
294
			  isc_buffer_t *target);
295 296 297 298

isc_result_t
dns_message_pseudosectiontotext(dns_message_t *msg,
				dns_pseudosection_t section,
299
				dns_messagetextflag_t flags,
300
				isc_buffer_t *target);
301
/*
302
 * Convert section 'section' or 'pseudosection' of message 'msg' to
303
 * a cleartext representation
304 305
 *
 * Notes:
306
 *      See dns_message_totext for meanings of flags.
307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
 *
 * Requires:
 *
 *	'msg' is a valid message.
 *
 *	'target' is a valid buffer.
 *
 *	'section' is a valid section label.
 *
 * Ensures:
 *
 *	If the result is success:
 *
 *		Any bitstring labels are in canonical form.
 *
 *		The used space in 'target' is updated.
 *
 * Returns:
 *
 *	ISC_R_SUCCESS
 *	ISC_R_NOSPACE
 *	ISC_R_NOMORE
 *
330
 *	Note: On error return, *target may be partially filled with data.
331 332 333
*/

isc_result_t
334
dns_message_totext(dns_message_t *msg, dns_messagetextflag_t flags,
335 336 337 338 339
		   isc_buffer_t *target);
/*
 * Convert all sections of message 'msg' to a cleartext representation
 *
 * Notes:
340
 *      In flags, If DNS_MESSAGETEXTFLAG_OMITDOT is set, then the
341
 *      final '.' in absolute names will not be emitted.  If
342
 *      DNS_MESSAGETEXTFLAG_NOCOMMENTS is cleared, lines beginning
343 344
 *      with ";;" will be emitted indicating section name.  If
 *      DNS_MESSAGETEXTFLAG_NOHEADERS is cleared, header lines will
345
 *      be emitted.
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366
 *
 * Requires:
 *
 *	'msg' is a valid message.
 *
 *	'target' is a valid buffer.
 *
 * Ensures:
 *
 *	If the result is success:
 *
 *		Any bitstring labels are in canonical form.
 *
 *		The used space in 'target' is updated.
 *
 * Returns:
 *
 *	ISC_R_SUCCESS
 *	ISC_R_NOSPACE
 *	ISC_R_NOMORE
 *
367 368
 *	Note: On error return, *target may be partially filled with data.
 */
369

370
isc_result_t
371
dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
372
		  unsigned int options);
Michael Graff's avatar
Michael Graff committed
373
/*
Michael Graff's avatar
Michael Graff committed
374 375 376 377
 * Parse raw wire data pointed to by "buffer" and bounded by "buflen" as a
 * DNS message.
 *
 * OPT records are detected and stored in the pseudo-section "opt".
Brian Wellington's avatar
Brian Wellington committed
378
 * TSIGs are detected and stored in the pseudo-section "tsig".
Michael Graff's avatar
Michael Graff committed
379
 *
380 381 382 383
 * If DNS_MESSAGEPARSE_PRESERVEORDER is set, or if the opcode of the message
 * is UPDATE, a separate dns_name_t object will be created for each RR in the
 * message.  Each such dns_name_t will have a single rdataset containing the
 * single RR, * and the order of the RRs in the message is preserved.
384 385
 * Otherwise, only one dns_name_t object will be created for each unique
 * owner name in the section, and each such dns_name_t will have a list
386 387
 * of rdatasets.  To access the names and their data, use
 * dns_message_firstname() and dns_message_nextname().
388
 *
389 390 391 392
 * If DNS_MESSAGEPARSE_BESTEFFORT is set, errors in message content will
 * not be considered FORMERRs.  If the entire message can be parsed, it
 * will be returned and DNS_R_RECOVERABLE will be returned.
 *
393 394 395
 * OPT and TSIG records are always handled specially, regardless of the
 * 'preserve_order' setting.
 *
Michael Graff's avatar
Michael Graff committed
396 397 398
 * Requires:
 *	"msg" be valid.
 *
399
 *	"buffer" be a wire format buffer.
Michael Graff's avatar
Michael Graff committed
400 401 402 403
 *
 * Ensures:
 *	The buffer's data format is correct.
 *
Michael Graff's avatar
Michael Graff committed
404 405
 *	The buffer's contents verify as correct regarding header bits, buffer
 * 	and rdata sizes, etc.
Michael Graff's avatar
Michael Graff committed
406 407
 *
 * Returns:
408 409
 *	ISC_R_SUCCESS		-- all is well
 *	ISC_R_NOMEMORY		-- no memory
410 411
 *	DNS_R_RECOVERABLE	-- the message parsed properly, but contained
 *				   errors.
Michael Graff's avatar
Michael Graff committed
412 413
 *	DNS_R_???		-- bad signature (XXXMLG need more of these)
 *	Many other errors possible XXXMLG
Michael Graff's avatar
Michael Graff committed
414 415
 */

416
isc_result_t
Michael Graff's avatar
Michael Graff committed
417
dns_message_renderbegin(dns_message_t *msg, isc_buffer_t *buffer);
Michael Graff's avatar
Michael Graff committed
418
/*
Michael Graff's avatar
Michael Graff committed
419 420
 * Begin rendering on a message.  Only one call can be made to this function
 * per message.
Michael Graff's avatar
Michael Graff committed
421
 *
Andreas Gustafsson's avatar
Andreas Gustafsson committed
422
 * The buffer is "owned" by the message library until dns_message_renderend()
Michael Graff's avatar
Michael Graff committed
423 424
 * is called.
 *
Michael Graff's avatar
Michael Graff committed
425
 * Requires:
Michael Graff's avatar
Michael Graff committed
426 427
 *
 *	'msg' be valid.
428
 *
429
 *	'buffer' is a valid buffer.
Michael Graff's avatar
Michael Graff committed
430 431 432 433
 *
 * Side Effects:
 *
 *	The buffer is cleared before it is used.
434
 *
Michael Graff's avatar
Michael Graff committed
435
 * Returns:
436 437
 *	ISC_R_SUCCESS		-- all is well
 *	ISC_R_NOSPACE		-- output buffer is too small
Michael Graff's avatar
Michael Graff committed
438
 *	Anything that dns_compress_init() can return.
Michael Graff's avatar
Michael Graff committed
439 440
 */

441
isc_result_t
442 443 444
dns_message_renderchangebuffer(dns_message_t *msg, isc_buffer_t *buffer);
/*
 * Reset the buffer.  This can be used after growing the old buffer
445
 * on a ISC_R_NOSPACE return from most of the render functions.
446
 *
Michael Graff's avatar
Michael Graff committed
447 448 449 450
 * On successful completion, the old buffer is no longer used by the
 * library.  The new buffer is owned by the library until
 * dns_message_renderend() is called.
 *
451 452 453 454 455 456 457 458 459
 * Requires:
 *
 *	'msg' be valid.
 *
 *	dns_message_renderbegin() was called.
 *
 *	buffer != NULL.
 *
 * Returns:
460 461
 *	ISC_R_NOSPACE		-- new buffer is too small
 *	ISC_R_SUCCESS		-- all is well.
462 463
 */

464
isc_result_t
465
dns_message_renderreserve(dns_message_t *msg, unsigned int space);
Michael Graff's avatar
Michael Graff committed
466
/*
Michael Graff's avatar
Michael Graff committed
467 468 469
 * XXXMLG should use size_t rather than unsigned int once the buffer
 * API is cleaned up
 *
Michael Graff's avatar
Michael Graff committed
470 471 472 473 474
 * Reserve "space" bytes in the given buffer.
 *
 * Requires:
 *
 *	'msg' be valid.
Michael Graff's avatar
Michael Graff committed
475
 *
476 477
 *	dns_message_renderbegin() was called.
 *
Michael Graff's avatar
Michael Graff committed
478
 * Returns:
479 480
 *	ISC_R_SUCCESS		-- all is well.
 *	ISC_R_NOSPACE		-- not enough free space in the buffer.
Michael Graff's avatar
Michael Graff committed
481 482
 */

483
void
Michael Graff's avatar
Michael Graff committed
484 485
dns_message_renderrelease(dns_message_t *msg, unsigned int space);
/*
Michael Graff's avatar
Michael Graff committed
486 487 488
 * XXXMLG should use size_t rather than unsigned int once the buffer
 * API is cleaned up
 *
Michael Graff's avatar
Michael Graff committed
489 490 491 492 493 494
 * Release "space" bytes in the given buffer that was previously reserved.
 *
 * Requires:
 *
 *	'msg' be valid.
 *
495 496
 *	'space' is less than or equal to the total amount of space reserved
 *	via prior calls to dns_message_renderreserve().
497
 *
498
 *	dns_message_renderbegin() was called.
Michael Graff's avatar
Michael Graff committed
499 500
 */

501
isc_result_t
502
dns_message_rendersection(dns_message_t *msg, dns_section_t section,
Michael Graff's avatar
Michael Graff committed
503
			  unsigned int options);
Michael Graff's avatar
Michael Graff committed
504
/*
Michael Graff's avatar
Michael Graff committed
505 506
 * Render all names, rdatalists, etc from the given section at the
 * specified priority or higher.
Michael Graff's avatar
Michael Graff committed
507 508
 *
 * Requires:
Michael Graff's avatar
Michael Graff committed
509 510 511
 *	'msg' be valid.
 *
 *	'section' be a valid section.
Michael Graff's avatar
Michael Graff committed
512
 *
513 514
 *	dns_message_renderbegin() was called.
 *
Michael Graff's avatar
Michael Graff committed
515
 * Returns:
516
 *	ISC_R_SUCCESS		-- all records were written, and there are
Michael Graff's avatar
Michael Graff committed
517
 *				   no more records for this section.
518
 *	ISC_R_NOSPACE		-- Not enough room in the buffer to write
Michael Graff's avatar
Michael Graff committed
519 520 521
 *				   all records requested.
 *	DNS_R_MOREDATA		-- All requested records written, and there
 *				   are records remaining for this section.
Michael Graff's avatar
Michael Graff committed
522 523
 */

524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
void
dns_message_renderheader(dns_message_t *msg, isc_buffer_t *target);
/*
 * Render the message header.  This is implicitly called by
 * dns_message_renderend().
 *
 * Requires:
 *
 *	'msg' be a valid message.
 *
 *	dns_message_renderbegin() was called.
 *
 *	'target' is a valid buffer with enough space to hold a message header
 */

539
isc_result_t
540
dns_message_renderend(dns_message_t *msg);
Michael Graff's avatar
Michael Graff committed
541
/*
Michael Graff's avatar
Michael Graff committed
542 543 544 545 546 547 548 549
 * Finish rendering to the buffer.  Note that more data can be in the
 * 'msg' structure.  Destroying the structure will free this, or in a multi-
 * part EDNS1 message this data can be rendered to another buffer later.
 *
 * Requires:
 *
 *	'msg' be a valid message.
 *
550 551
 *	dns_message_renderbegin() was called.
 *
Michael Graff's avatar
Michael Graff committed
552
 * Returns:
553
 *	ISC_R_SUCCESS		-- all is well.
Michael Graff's avatar
Michael Graff committed
554
 */
555

Bob Halley's avatar
Bob Halley committed
556 557 558 559 560 561 562 563 564 565 566 567 568 569
void
dns_message_renderreset(dns_message_t *msg);
/*
 * Reset the message so that it may be rendered again.
 *
 * Notes:
 *
 *	If dns_message_renderbegin() has been called, dns_message_renderend()
 *	must be called before calling this function.
 *
 * Requires:
 *
 *	'msg' be a valid message with rendering intent.
 */
Michael Graff's avatar
Michael Graff committed
570

571
isc_result_t
Michael Graff's avatar
Michael Graff committed
572 573 574 575
dns_message_firstname(dns_message_t *msg, dns_section_t section);
/*
 * Set internal per-section name pointer to the beginning of the section.
 *
Michael Graff's avatar
Michael Graff committed
576
 * The functions dns_message_firstname() and dns_message_nextname() may
577
 * be used for iterating over the owner names in a section.
Michael Graff's avatar
Michael Graff committed
578
 *
Michael Graff's avatar
Michael Graff committed
579 580 581 582 583 584 585
 * Requires:
 *
 *   	'msg' be valid.
 *
 *	'section' be a valid section.
 *
 * Returns:
586 587
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMORE		-- No names on given section.
Michael Graff's avatar
Michael Graff committed
588 589
 */

590
isc_result_t
Michael Graff's avatar
Michael Graff committed
591 592 593 594 595 596 597 598 599 600 601
dns_message_nextname(dns_message_t *msg, dns_section_t section);
/*
 * Sets the internal per-section name pointer to point to the next name
 * in that section.
 *
 * Requires:
 *
 *   	'msg' be valid.
 *
 *	'section' be a valid section.
 *
Michael Graff's avatar
Michael Graff committed
602
 *	dns_message_firstname() must have been called on this section,
603
 *	and the result was ISC_R_SUCCESS.
Michael Graff's avatar
Michael Graff committed
604
 *
Michael Graff's avatar
Michael Graff committed
605
 * Returns:
606 607
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMORE		-- No names in given section.
Michael Graff's avatar
Michael Graff committed
608 609
 */

Michael Graff's avatar
Michael Graff committed
610
void
Michael Graff's avatar
Michael Graff committed
611 612 613 614 615 616
dns_message_currentname(dns_message_t *msg, dns_section_t section,
			dns_name_t **name);
/*
 * Sets 'name' to point to the name where the per-section internal name
 * pointer is currently set.
 *
Michael Graff's avatar
Michael Graff committed
617 618 619
 * This function returns the name in the database, so any data associated
 * with it (via the name's "list" member) contains the actual rdatasets.
 *
Michael Graff's avatar
Michael Graff committed
620 621 622 623 624 625 626 627
 * Requires:
 *
 *	'msg' be valid.
 *
 *	'name' be non-NULL, and *name be NULL.
 *
 *	'section' be a valid section.
 *
Michael Graff's avatar
Michael Graff committed
628 629
 *	dns_message_firstname() must have been called on this section,
 *	and the result of it and any dns_message_nextname() calls was
630
 *	ISC_R_SUCCESS.
Michael Graff's avatar
Michael Graff committed
631 632
 */

633
isc_result_t
Michael Graff's avatar
Michael Graff committed
634 635
dns_message_findname(dns_message_t *msg, dns_section_t section,
		     dns_name_t *target, dns_rdatatype_t type,
Bob Halley's avatar
Bob Halley committed
636 637
		     dns_rdatatype_t covers, dns_name_t **foundname,
		     dns_rdataset_t **rdataset);
Michael Graff's avatar
Michael Graff committed
638
/*
Michael Graff's avatar
Michael Graff committed
639 640
 * Search for a name in the specified section.  If it is found, *name is
 * set to point to the name, and *rdataset is set to point to the found
Bob Halley's avatar
Bob Halley committed
641
 * rdataset (if type is specified as other than dns_rdatatype_any).
Michael Graff's avatar
Michael Graff committed
642 643 644 645 646 647
 *
 * Requires:
 *	'msg' be valid.
 *
 *	'section' be a valid section.
 *
Michael Graff's avatar
Michael Graff committed
648 649
 *	If a pointer to the name is desired, 'foundname' should be non-NULL.
 *	If it is non-NULL, '*foundname' MUST be NULL.
Michael Graff's avatar
Michael Graff committed
650 651 652
 *
 *	If a type other than dns_datatype_any is searched for, 'rdataset'
 *	may be non-NULL, '*rdataset' be NULL, and will point at the found
Michael Graff's avatar
Michael Graff committed
653
 *	rdataset.  If the type is dns_datatype_any, 'rdataset' must be NULL.
Michael Graff's avatar
Michael Graff committed
654 655 656 657 658 659
 *
 *	'target' be a valid name.
 *
 *	'type' be a valid type.
 *
 * Returns:
660
 *	ISC_R_SUCCESS		-- all is well.
Michael Graff's avatar
Michael Graff committed
661
 *	DNS_R_NXDOMAIN		-- name does not exist in that section.
662
 *	DNS_R_NXRRSET		-- The name does exist, but the desired
Michael Graff's avatar
Michael Graff committed
663
 *				   type does not.
Michael Graff's avatar
Michael Graff committed
664 665
 */

666
isc_result_t
667 668 669 670 671 672 673 674 675 676 677 678
dns_message_findtype(dns_name_t *name, dns_rdatatype_t type,
		     dns_rdatatype_t covers, dns_rdataset_t **rdataset);
/*
 * Search the name for the specified type.  If it is found, *rdataset is
 * filled in with a pointer to that rdataset.
 *
 * Requires:
 *	if '**rdataset' is non-NULL, *rdataset needs to be NULL.
 *
 *	'type' be a valid type, and NOT dns_rdatatype_any.
 *
 * Returns:
679 680
 *	ISC_R_SUCCESS		-- all is well.
 *	ISC_R_NOTFOUND		-- the desired type does not exist.
681 682
 */

Michael Graff's avatar
Michael Graff committed
683 684 685 686
void
dns_message_movename(dns_message_t *msg, dns_name_t *name,
		     dns_section_t fromsection,
		     dns_section_t tosection);
Michael Graff's avatar
Michael Graff committed
687 688
/*
 * Move a name from one section to another.
Michael Graff's avatar
Michael Graff committed
689 690 691 692 693
 *
 * Requires:
 *
 *	'msg' be valid.
 *
Michael Graff's avatar
Michael Graff committed
694
 *	'name' must be a name already in 'fromsection'.
Michael Graff's avatar
Michael Graff committed
695 696 697
 *
 *	'fromsection' must be a valid section.
 *
Michael Graff's avatar
Michael Graff committed
698
 *	'tosection' must be a valid section.
Michael Graff's avatar
Michael Graff committed
699 700
 */

Michael Graff's avatar
Michael Graff committed
701 702 703
void
dns_message_addname(dns_message_t *msg, dns_name_t *name,
		    dns_section_t section);
Michael Graff's avatar
Michael Graff committed
704 705 706
/*
 * Adds the name to the given section.
 *
Michael Graff's avatar
Michael Graff committed
707 708
 * It is the caller's responsibility to enforce any unique name requirements
 * in a section.
Michael Graff's avatar
Michael Graff committed
709 710 711 712 713 714 715 716
 *
 * Requires:
 *
 *	'msg' be valid, and be a renderable message.
 *
 *	'name' be a valid name.
 *
 *	'section' be a named section.
Michael Graff's avatar
Michael Graff committed
717
 */
718

719 720 721 722 723 724 725 726
/*
 * LOANOUT FUNCTIONS
 *
 * Each of these functions loan a particular type of data to the caller.
 * The storage for these will vanish when the message is destroyed or
 * reset, and must NOT be used after these operations.
 */

727
isc_result_t
728 729 730
dns_message_gettempname(dns_message_t *msg, dns_name_t **item);
/*
 * Return a name that can be used for any temporary purpose, including
731 732 733
 * inserting into the message's linked lists.  The name must be returned
 * to the message code using dns_message_puttempname() or inserted into
 * one of the message's sections before the message is destroyed.
734 735 736 737 738 739 740 741 742
 *
 * It is the caller's responsibility to initialize this name.
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item == NULL
 *
 * Returns:
743 744
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMEMORY		-- No item can be allocated.
745 746
 */

747
isc_result_t
748 749 750
dns_message_gettemprdata(dns_message_t *msg, dns_rdata_t **item);
/*
 * Return a rdata that can be used for any temporary purpose, including
751 752
 * inserting into the message's linked lists.  The rdata will be freed
 * when the message is destroyed or reset.
753 754 755 756 757 758 759
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item == NULL
 *
 * Returns:
760 761
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMEMORY		-- No item can be allocated.
762 763
 */

764
isc_result_t
765 766 767
dns_message_gettemprdataset(dns_message_t *msg, dns_rdataset_t **item);
/*
 * Return a rdataset that can be used for any temporary purpose, including
768 769 770
 * inserting into the message's linked lists. The name must be returned
 * to the message code using dns_message_puttempname() or inserted into
 * one of the message's sections before the message is destroyed.
771 772 773 774 775 776 777
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item == NULL
 *
 * Returns:
778 779
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMEMORY		-- No item can be allocated.
780 781
 */

782
isc_result_t
783 784 785
dns_message_gettemprdatalist(dns_message_t *msg, dns_rdatalist_t **item);
/*
 * Return a rdatalist that can be used for any temporary purpose, including
786 787
 * inserting into the message's linked lists.  The rdatalist will be
 * destroyed when the message is destroyed or reset.
788 789 790 791 792 793 794
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item == NULL
 *
 * Returns:
795 796
 *	ISC_R_SUCCESS		-- All is well.
 *	ISC_R_NOMEMORY		-- No item can be allocated.
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
 */

void
dns_message_puttempname(dns_message_t *msg, dns_name_t **item);
/*
 * Return a borrowed name to the message's name free list.
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item point to a name returned by
 *	dns_message_gettempname()
 *
 * Ensures:
 *	*item == NULL
 */

void
dns_message_puttemprdata(dns_message_t *msg, dns_rdata_t **item);
/*
 * Return a borrowed rdata to the message's rdata free list.
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item point to a rdata returned by
 *	dns_message_gettemprdata()
 *
 * Ensures:
 *	*item == NULL
 */

void
dns_message_puttemprdataset(dns_message_t *msg, dns_rdataset_t **item);
/*
 * Return a borrowed rdataset to the message's rdataset free list.
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item point to a rdataset returned by
 *	dns_message_gettemprdataset()
 *
 * Ensures:
 *	*item == NULL
 */

void
dns_message_puttemprdatalist(dns_message_t *msg, dns_rdatalist_t **item);
/*
 * Return a borrowed rdatalist to the message's rdatalist free list.
 *
 * Requires:
 *	msg be a valid message
 *
 *	item != NULL && *item point to a rdatalist returned by
 *	dns_message_gettemprdatalist()
 *
 * Ensures:
 *	*item == NULL
 */

859
isc_result_t
Michael Graff's avatar
Michael Graff committed
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
dns_message_peekheader(isc_buffer_t *source, dns_messageid_t *idp,
		       unsigned int *flagsp);
/*
 * Assume the remaining region of "source" is a DNS message.  Peek into
 * it and fill in "*idp" with the message id, and "*flagsp" with the flags.
 *
 * Requires:
 *
 *	source != NULL
 *
 * Ensures:
 *
 *	if (idp != NULL) *idp == message id.
 *
 *	if (flagsp != NULL) *flagsp == message flags.
 *
 * Returns:
 *
878
 *	ISC_R_SUCCESS		-- all is well.
Michael Graff's avatar
Michael Graff committed
879
 *
880
 *	ISC_R_UNEXPECTEDEND	-- buffer doesn't contain enough for a header.
Michael Graff's avatar
Michael Graff committed
881 882
 */

883
isc_result_t
Bob Halley's avatar
Bob Halley committed
884 885 886 887 888 889
dns_message_reply(dns_message_t *msg, isc_boolean_t want_question_section);
/*
 * Start formatting a reply to the query in 'msg'.
 *
 * Requires:
 *
Bob Halley's avatar
EDNS0  
Bob Halley committed
890
 *	'msg' is a valid message with parsing intent, and contains a query.
891
 *
Bob Halley's avatar
Bob Halley committed
892 893 894
 * Ensures:
 *
 *	The message will have a rendering intent.  If 'want_question_section'
895 896 897 898 899
 *	is true, the message opcode is query or notify, and the question
 *	section is present and properly formatted, then the question section
 *	will be included in the reply.  All other sections will be cleared.
 *	The QR flag will be set, the RD flag will be preserved, and all other
 *	flags will be cleared.
Bob Halley's avatar
Bob Halley committed
900 901 902
 *
 * Returns:
 *
903
 *	ISC_R_SUCCESS		-- all is well.
Bob Halley's avatar
Bob Halley committed
904
 *
Bob Halley's avatar
Bob Halley committed
905 906 907 908 909 910 911
 *	DNS_R_FORMERR		-- the header or question section of the
 *				   message is invalid, replying is impossible.
 *				   If DNS_R_FORMERR is returned when
 *				   want_question_section is ISC_FALSE, then
 *				   it's the header section that's bad;
 *				   otherwise either of the header or question
 *				   sections may be bad.
Bob Halley's avatar
Bob Halley committed
912 913
 */

Bob Halley's avatar
EDNS0  
Bob Halley committed
914 915 916 917 918 919 920 921 922 923 924 925 926 927
dns_rdataset_t *
dns_message_getopt(dns_message_t *msg);
/*
 * Get the OPT record for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message.
 *
 * Returns:
 *
 *	The OPT rdataset of 'msg', or NULL if there isn't one.
 */

928
isc_result_t
Bob Halley's avatar
EDNS0  
Bob Halley committed
929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
dns_message_setopt(dns_message_t *msg, dns_rdataset_t *opt);
/*
 * Set the OPT record for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message with rendering intent,
 *	dns_message_renderbegin() has been called, and no sections have been
 *	rendered.
 *
 *	'opt' is a valid OPT record.
 *
 * Ensures:
 *
 *	The OPT record will be rendered when dns_message_renderend() is
 *	called.
 *
 * Returns:
 *
948
 *	ISC_R_SUCCESS		-- all is well.
Bob Halley's avatar
EDNS0  
Bob Halley committed
949
 *
950
 *	ISC_R_NOSPACE		-- there is no space for the OPT record.
Bob Halley's avatar
EDNS0  
Bob Halley committed
951 952
 */

953 954 955 956 957 958 959 960
dns_rdataset_t *
dns_message_gettsig(dns_message_t *msg, dns_name_t **owner);
/*
 * Get the TSIG record and owner for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message.
961
 *	'owner' is NULL or *owner is NULL.
962 963 964 965
 *
 * Returns:
 *
 *	The TSIG rdataset of 'msg', or NULL if there isn't one.
966 967 968 969
 *
 * Ensures:
 *
 * 	If 'owner' is not NULL, it will point to the owner name.
970 971
 */

972
isc_result_t
973 974 975 976 977 978 979 980
dns_message_settsigkey(dns_message_t *msg, dns_tsigkey_t *key);
/*
 * Set the tsig key for 'msg'.  This is only necessary for when rendering a
 * query or parsing a response.  The key (if non-NULL) is attached to, and
 * will be detached when the message is destroyed.
 *
 * Requires:
 *
981 982 983
 *	'msg' is a valid message with rendering intent,
 *	dns_message_renderbegin() has been called, and no sections have been
 *	rendered.
984
 *	'key' is a valid tsig key or NULL.
985 986 987 988 989 990
 *
 * Returns:
 *
 *	ISC_R_SUCCESS		-- all is well.
 *
 *	ISC_R_NOSPACE		-- there is no space for the TSIG record.
991 992 993 994 995 996 997 998 999 1000 1001 1002
 */

dns_tsigkey_t *
dns_message_gettsigkey(dns_message_t *msg);
/*
 * Gets the tsig key for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message
 */

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
isc_result_t
dns_message_setquerytsig(dns_message_t *msg, isc_buffer_t *querytsig);
/*
 * Indicates that 'querytsig' is the TSIG from the signed query for which
 * 'msg' is the response.  This is also used for chained TSIGs in TCP
 * responses.
 *
 * Requires:
 *
 *	'querytsig' is a valid buffer as returned by dns_message_getquerytsig()
 *	or NULL
 *
 *	'msg' is a valid message
 *
 * Returns:
 *
 *	ISC_R_SUCCESS
 *	ISC_R_NOMEMORY
 */

isc_result_t
dns_message_getquerytsig(dns_message_t *msg, isc_mem_t *mctx,
			 isc_buffer_t **querytsig);
/*
 * Gets the tsig from the TSIG from the signed query 'msg'.  This is also used
 * for chained TSIGs in TCP responses.  Unlike dns_message_gettsig, this makes
 * a copy of the data, so can be used if the message is destroyed.
 *
 * Requires:
 *
 *	'msg' is a valid signed message
 *	'mctx' is a valid memory context
 *	querytsig != NULL && *querytsig == NULL
 *
 * Returns:
 *
 *	ISC_R_SUCCESS
 *	ISC_R_NOMEMORY
 *
 * Ensures:
 * 	'tsig' points to NULL or an allocated buffer which must be freed
 * 	by the caller.
 */

1047
dns_rdataset_t *
1048
dns_message_getsig0(dns_message_t *msg, dns_name_t **owner);
1049
/*
1050
 * Get the SIG(0) record and owner for 'msg'.
1051 1052 1053 1054
 *
 * Requires:
 *
 *	'msg' is a valid message.
1055
 *	'owner' is NULL or *owner is NULL.
1056 1057 1058 1059
 *
 * Returns:
 *
 *	The SIG(0) rdataset of 'msg', or NULL if there isn't one.
1060 1061 1062 1063
 *
 * Ensures:
 *
 * 	If 'owner' is not NULL, it will point to the owner name.
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
isc_result_t
dns_message_setsig0key(dns_message_t *msg, dst_key_t *key);
/*
 * Set the SIG(0) key for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message with rendering intent,
 *	dns_message_renderbegin() has been called, and no sections have been
 *	rendered.
 *	'key' is a valid sig key or NULL.
 *
 * Returns:
 *
 *	ISC_R_SUCCESS		-- all is well.
 *
 *	ISC_R_NOSPACE		-- there is no space for the SIG(0) record.
 */

dst_key_t *
dns_message_getsig0key(dns_message_t *msg);
/*
 * Gets the SIG(0) key for 'msg'.
 *
 * Requires:
 *
 *	'msg' is a valid message
 */

1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
void
dns_message_takebuffer(dns_message_t *msg, isc_buffer_t **buffer);
/*
 * Give the *buffer to the message code to clean up when it is no
 * longer needed.  This is usually when the message is reset or
 * destroyed.
 *
 * Requires:
 *
 *	msg be a valid message.
 *
 *	buffer != NULL && *buffer is a valid isc_buffer_t, which was
 *	dynamincally allocated via isc_buffer_allocate().
 */

Brian Wellington's avatar
Brian Wellington committed
1110
isc_result_t
1111
dns_message_signer(dns_message_t *msg, dns_name_t *signer);
Brian Wellington's avatar
Brian Wellington committed
1112
/*
1113
 * If this message was signed, return the identity of the signer.
Brian Wellington's avatar
Brian Wellington committed
1114 1115
 * Unless ISC_R_NOTFOUND is returned, signer will reflect the name of the
 * key that signed the message.
Brian Wellington's avatar
Brian Wellington committed
1116 1117 1118
 *
 * Requires:
 *
1119 1120
 *	msg is a valid parsed message.
 *	signer is a valid name
Brian Wellington's avatar
Brian Wellington committed
1121 1122 1123 1124 1125 1126
 *
 * Returns:
 *
 *	ISC_R_SUCCESS		- the message was signed, and *signer
 *				  contains the signing identity
 *
1127
 *	ISC_R_NOTFOUND		- no TSIG or SIG(0) record is present in the
Brian Wellington's avatar
Brian Wellington committed
1128 1129
 *				  message
 *
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
 *	DNS_R_TSIGVERIFYFAILURE	- the message was signed by a TSIG, but the
 *				  signature failed to verify
 *
 *	DNS_R_TSIGERRORSET	- the message was signed by a TSIG and
 *				  verified, but the query was rejected by
 *				  the server
 *
 *	DNS_R_NOIDENTITY	- the message was signed by a TSIG and
 *				  verified, but the key has no identity since
 *				  it was generated by an unsigned TKEY process
Brian Wellington's avatar
Brian Wellington committed
1140
 *
1141 1142
 *	DNS_R_SIGINVALID	- the message was signed by a SIG(0), but
 *				  the signature failed to verify
Brian Wellington's avatar
Brian Wellington committed
1143
 *
1144 1145
 *	DNS_R_SIGNOTVERIFIEDYET	- the message was signed by a SIG(0), but
 *				  the signature has not been verified yet
Brian Wellington's avatar
Brian Wellington committed
1146 1147
 */

Brian Wellington's avatar
Brian Wellington committed
1148 1149 1150 1151 1152 1153 1154 1155
isc_result_t
dns_message_checksig(dns_message_t *msg, dns_view_t *view);
/*
 * If this message was signed, verify the signature.
 *
 * Requires:
 *
 *	msg is a valid parsed message.
1156
 *	view is a valid view or NULL
Brian Wellington's avatar
Brian Wellington committed
1157