2 * Copyright (C) 2004-2014 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
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.
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.
29 #include <isc/buffer.h>
31 #include <isc/print.h>
32 #include <isc/string.h> /* Required for HP/UX (and others?) */
35 #include <dns/dnssec.h>
36 #include <dns/keyvalues.h>
38 #include <dns/masterdump.h>
39 #include <dns/message.h>
40 #include <dns/opcode.h>
41 #include <dns/rdata.h>
42 #include <dns/rdatalist.h>
43 #include <dns/rdataset.h>
44 #include <dns/rdatastruct.h>
45 #include <dns/result.h>
51 hexdump(const char *msg, const char *msg2, void *base, size_t len) {
58 printf("*** %s [%s] (%u bytes @ %p)\n", msg, msg2, len, base);
63 else if (cnt % 8 == 0)
65 printf(" %02x %c", *p, (isprint(*p) ? *p : ' '));
78 #define DNS_MESSAGE_OPCODE_MASK 0x7800U
79 #define DNS_MESSAGE_OPCODE_SHIFT 11
80 #define DNS_MESSAGE_RCODE_MASK 0x000fU
81 #define DNS_MESSAGE_FLAG_MASK 0x8ff0U
82 #define DNS_MESSAGE_EDNSRCODE_MASK 0xff000000U
83 #define DNS_MESSAGE_EDNSRCODE_SHIFT 24
84 #define DNS_MESSAGE_EDNSVERSION_MASK 0x00ff0000U
85 #define DNS_MESSAGE_EDNSVERSION_SHIFT 16
87 #define VALID_NAMED_SECTION(s) (((s) > DNS_SECTION_ANY) \
88 && ((s) < DNS_SECTION_MAX))
89 #define VALID_SECTION(s) (((s) >= DNS_SECTION_ANY) \
90 && ((s) < DNS_SECTION_MAX))
91 #define ADD_STRING(b, s) {if (strlen(s) >= \
92 isc_buffer_availablelength(b)) \
93 return(ISC_R_NOSPACE); else \
94 isc_buffer_putstr(b, s);}
95 #define VALID_PSEUDOSECTION(s) (((s) >= DNS_PSEUDOSECTION_ANY) \
96 && ((s) < DNS_PSEUDOSECTION_MAX))
98 #define OPTOUT(x) (((x)->attributes & DNS_RDATASETATTR_OPTOUT) != 0)
101 * This is the size of each individual scratchpad buffer, and the numbers
102 * of various block allocations used within the server.
103 * XXXMLG These should come from a config setting.
105 #define SCRATCHPAD_SIZE 512
107 #define OFFSET_COUNT 4
108 #define RDATA_COUNT 8
109 #define RDATALIST_COUNT 8
110 #define RDATASET_COUNT RDATALIST_COUNT
113 * Text representation of the different items, for message_totext
116 static const char *sectiontext[] = {
123 static const char *updsectiontext[] = {
130 static const char *opcodetext[] = {
149 static const char *rcodetext[] = {
171 * "helper" type, which consists of a block of some type, and is linkable.
172 * For it to work, sizeof(dns_msgblock_t) must be a multiple of the pointer
173 * size, or the allocated elements will not be aligned correctly.
175 struct dns_msgblock {
177 unsigned int remaining;
178 ISC_LINK(dns_msgblock_t) link;
179 }; /* dynamically sized */
181 static inline dns_msgblock_t *
182 msgblock_allocate(isc_mem_t *, unsigned int, unsigned int);
184 #define msgblock_get(block, type) \
185 ((type *)msgblock_internalget(block, sizeof(type)))
188 msgblock_internalget(dns_msgblock_t *, unsigned int);
191 msgblock_reset(dns_msgblock_t *);
194 msgblock_free(isc_mem_t *, dns_msgblock_t *, unsigned int);
197 * Allocate a new dns_msgblock_t, and return a pointer to it. If no memory
198 * is free, return NULL.
200 static inline dns_msgblock_t *
201 msgblock_allocate(isc_mem_t *mctx, unsigned int sizeof_type,
204 dns_msgblock_t *block;
207 length = sizeof(dns_msgblock_t) + (sizeof_type * count);
209 block = isc_mem_get(mctx, length);
213 block->count = count;
214 block->remaining = count;
216 ISC_LINK_INIT(block, link);
222 * Return an element from the msgblock. If no more are available, return
226 msgblock_internalget(dns_msgblock_t *block, unsigned int sizeof_type) {
229 if (block == NULL || block->remaining == 0)
234 ptr = (((unsigned char *)block)
235 + sizeof(dns_msgblock_t)
236 + (sizeof_type * block->remaining));
242 msgblock_reset(dns_msgblock_t *block) {
243 block->remaining = block->count;
247 * Release memory associated with a message block.
250 msgblock_free(isc_mem_t *mctx, dns_msgblock_t *block, unsigned int sizeof_type)
254 length = sizeof(dns_msgblock_t) + (sizeof_type * block->count);
256 isc_mem_put(mctx, block, length);
260 * Allocate a new dynamic buffer, and attach it to this message as the
261 * "current" buffer. (which is always the last on the list, for our
264 static inline isc_result_t
265 newbuffer(dns_message_t *msg, unsigned int size) {
267 isc_buffer_t *dynbuf;
270 result = isc_buffer_allocate(msg->mctx, &dynbuf, size);
271 if (result != ISC_R_SUCCESS)
272 return (ISC_R_NOMEMORY);
274 ISC_LIST_APPEND(msg->scratchpad, dynbuf, link);
275 return (ISC_R_SUCCESS);
278 static inline isc_buffer_t *
279 currentbuffer(dns_message_t *msg) {
280 isc_buffer_t *dynbuf;
282 dynbuf = ISC_LIST_TAIL(msg->scratchpad);
283 INSIST(dynbuf != NULL);
289 releaserdata(dns_message_t *msg, dns_rdata_t *rdata) {
290 ISC_LIST_PREPEND(msg->freerdata, rdata, link);
293 static inline dns_rdata_t *
294 newrdata(dns_message_t *msg) {
295 dns_msgblock_t *msgblock;
298 rdata = ISC_LIST_HEAD(msg->freerdata);
300 ISC_LIST_UNLINK(msg->freerdata, rdata, link);
304 msgblock = ISC_LIST_TAIL(msg->rdatas);
305 rdata = msgblock_get(msgblock, dns_rdata_t);
307 msgblock = msgblock_allocate(msg->mctx, sizeof(dns_rdata_t),
309 if (msgblock == NULL)
312 ISC_LIST_APPEND(msg->rdatas, msgblock, link);
314 rdata = msgblock_get(msgblock, dns_rdata_t);
317 dns_rdata_init(rdata);
322 releaserdatalist(dns_message_t *msg, dns_rdatalist_t *rdatalist) {
323 ISC_LIST_PREPEND(msg->freerdatalist, rdatalist, link);
326 static inline dns_rdatalist_t *
327 newrdatalist(dns_message_t *msg) {
328 dns_msgblock_t *msgblock;
329 dns_rdatalist_t *rdatalist;
331 rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
332 if (rdatalist != NULL) {
333 ISC_LIST_UNLINK(msg->freerdatalist, rdatalist, link);
337 msgblock = ISC_LIST_TAIL(msg->rdatalists);
338 rdatalist = msgblock_get(msgblock, dns_rdatalist_t);
339 if (rdatalist == NULL) {
340 msgblock = msgblock_allocate(msg->mctx,
341 sizeof(dns_rdatalist_t),
343 if (msgblock == NULL)
346 ISC_LIST_APPEND(msg->rdatalists, msgblock, link);
348 rdatalist = msgblock_get(msgblock, dns_rdatalist_t);
354 static inline dns_offsets_t *
355 newoffsets(dns_message_t *msg) {
356 dns_msgblock_t *msgblock;
357 dns_offsets_t *offsets;
359 msgblock = ISC_LIST_TAIL(msg->offsets);
360 offsets = msgblock_get(msgblock, dns_offsets_t);
361 if (offsets == NULL) {
362 msgblock = msgblock_allocate(msg->mctx,
363 sizeof(dns_offsets_t),
365 if (msgblock == NULL)
368 ISC_LIST_APPEND(msg->offsets, msgblock, link);
370 offsets = msgblock_get(msgblock, dns_offsets_t);
377 msginitheader(dns_message_t *m) {
386 msginitprivate(dns_message_t *m) {
389 for (i = 0; i < DNS_SECTION_MAX; i++) {
390 m->cursors[i] = NULL;
398 m->state = DNS_SECTION_ANY; /* indicate nothing parsed or rendered */
406 msginittsig(dns_message_t *m) {
407 m->tsigstatus = dns_rcode_noerror;
408 m->querytsigstatus = dns_rcode_noerror;
413 m->sig0status = dns_rcode_noerror;
418 * Init elements to default state. Used both when allocating a new element
419 * and when resetting one.
422 msginit(dns_message_t *m) {
428 m->tcp_continuation = 0;
430 m->verify_attempted = 0;
433 m->query.base = NULL;
436 m->saved.base = NULL;
443 msgresetnames(dns_message_t *msg, unsigned int first_section) {
445 dns_name_t *name, *next_name;
446 dns_rdataset_t *rds, *next_rds;
449 * Clean up name lists by calling the rdataset disassociate function.
451 for (i = first_section; i < DNS_SECTION_MAX; i++) {
452 name = ISC_LIST_HEAD(msg->sections[i]);
453 while (name != NULL) {
454 next_name = ISC_LIST_NEXT(name, link);
455 ISC_LIST_UNLINK(msg->sections[i], name, link);
457 rds = ISC_LIST_HEAD(name->list);
458 while (rds != NULL) {
459 next_rds = ISC_LIST_NEXT(rds, link);
460 ISC_LIST_UNLINK(name->list, rds, link);
462 INSIST(dns_rdataset_isassociated(rds));
463 dns_rdataset_disassociate(rds);
464 isc_mempool_put(msg->rdspool, rds);
467 if (dns_name_dynamic(name))
468 dns_name_free(name, msg->mctx);
469 isc_mempool_put(msg->namepool, name);
476 msgresetopt(dns_message_t *msg)
478 if (msg->opt != NULL) {
479 if (msg->opt_reserved > 0) {
480 dns_message_renderrelease(msg, msg->opt_reserved);
481 msg->opt_reserved = 0;
483 INSIST(dns_rdataset_isassociated(msg->opt));
484 dns_rdataset_disassociate(msg->opt);
485 isc_mempool_put(msg->rdspool, msg->opt);
491 msgresetsigs(dns_message_t *msg, isc_boolean_t replying) {
492 if (msg->sig_reserved > 0) {
493 dns_message_renderrelease(msg, msg->sig_reserved);
494 msg->sig_reserved = 0;
496 if (msg->tsig != NULL) {
497 INSIST(dns_rdataset_isassociated(msg->tsig));
498 INSIST(msg->namepool != NULL);
500 INSIST(msg->querytsig == NULL);
501 msg->querytsig = msg->tsig;
503 dns_rdataset_disassociate(msg->tsig);
504 isc_mempool_put(msg->rdspool, msg->tsig);
505 if (msg->querytsig != NULL) {
506 dns_rdataset_disassociate(msg->querytsig);
507 isc_mempool_put(msg->rdspool, msg->querytsig);
510 if (dns_name_dynamic(msg->tsigname))
511 dns_name_free(msg->tsigname, msg->mctx);
512 isc_mempool_put(msg->namepool, msg->tsigname);
514 msg->tsigname = NULL;
515 } else if (msg->querytsig != NULL && !replying) {
516 dns_rdataset_disassociate(msg->querytsig);
517 isc_mempool_put(msg->rdspool, msg->querytsig);
518 msg->querytsig = NULL;
520 if (msg->sig0 != NULL) {
521 INSIST(dns_rdataset_isassociated(msg->sig0));
522 dns_rdataset_disassociate(msg->sig0);
523 isc_mempool_put(msg->rdspool, msg->sig0);
524 if (msg->sig0name != NULL) {
525 if (dns_name_dynamic(msg->sig0name))
526 dns_name_free(msg->sig0name, msg->mctx);
527 isc_mempool_put(msg->namepool, msg->sig0name);
530 msg->sig0name = NULL;
535 * Free all but one (or everything) for this message. This is used by
536 * both dns_message_reset() and dns_message_destroy().
539 msgreset(dns_message_t *msg, isc_boolean_t everything) {
540 dns_msgblock_t *msgblock, *next_msgblock;
541 isc_buffer_t *dynbuf, *next_dynbuf;
543 dns_rdatalist_t *rdatalist;
545 msgresetnames(msg, 0);
547 msgresetsigs(msg, ISC_FALSE);
550 * Clean up linked lists.
554 * Run through the free lists, and just unlink anything found there.
555 * The memory isn't lost since these are part of message blocks we
558 rdata = ISC_LIST_HEAD(msg->freerdata);
559 while (rdata != NULL) {
560 ISC_LIST_UNLINK(msg->freerdata, rdata, link);
561 rdata = ISC_LIST_HEAD(msg->freerdata);
563 rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
564 while (rdatalist != NULL) {
565 ISC_LIST_UNLINK(msg->freerdatalist, rdatalist, link);
566 rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
569 dynbuf = ISC_LIST_HEAD(msg->scratchpad);
570 INSIST(dynbuf != NULL);
572 isc_buffer_clear(dynbuf);
573 dynbuf = ISC_LIST_NEXT(dynbuf, link);
575 while (dynbuf != NULL) {
576 next_dynbuf = ISC_LIST_NEXT(dynbuf, link);
577 ISC_LIST_UNLINK(msg->scratchpad, dynbuf, link);
578 isc_buffer_free(&dynbuf);
579 dynbuf = next_dynbuf;
582 msgblock = ISC_LIST_HEAD(msg->rdatas);
583 if (!everything && msgblock != NULL) {
584 msgblock_reset(msgblock);
585 msgblock = ISC_LIST_NEXT(msgblock, link);
587 while (msgblock != NULL) {
588 next_msgblock = ISC_LIST_NEXT(msgblock, link);
589 ISC_LIST_UNLINK(msg->rdatas, msgblock, link);
590 msgblock_free(msg->mctx, msgblock, sizeof(dns_rdata_t));
591 msgblock = next_msgblock;
595 * rdatalists could be empty.
598 msgblock = ISC_LIST_HEAD(msg->rdatalists);
599 if (!everything && msgblock != NULL) {
600 msgblock_reset(msgblock);
601 msgblock = ISC_LIST_NEXT(msgblock, link);
603 while (msgblock != NULL) {
604 next_msgblock = ISC_LIST_NEXT(msgblock, link);
605 ISC_LIST_UNLINK(msg->rdatalists, msgblock, link);
606 msgblock_free(msg->mctx, msgblock, sizeof(dns_rdatalist_t));
607 msgblock = next_msgblock;
610 msgblock = ISC_LIST_HEAD(msg->offsets);
611 if (!everything && msgblock != NULL) {
612 msgblock_reset(msgblock);
613 msgblock = ISC_LIST_NEXT(msgblock, link);
615 while (msgblock != NULL) {
616 next_msgblock = ISC_LIST_NEXT(msgblock, link);
617 ISC_LIST_UNLINK(msg->offsets, msgblock, link);
618 msgblock_free(msg->mctx, msgblock, sizeof(dns_offsets_t));
619 msgblock = next_msgblock;
622 if (msg->tsigkey != NULL) {
623 dns_tsigkey_detach(&msg->tsigkey);
627 if (msg->tsigctx != NULL)
628 dst_context_destroy(&msg->tsigctx);
630 if (msg->query.base != NULL) {
631 if (msg->free_query != 0)
632 isc_mem_put(msg->mctx, msg->query.base,
634 msg->query.base = NULL;
635 msg->query.length = 0;
638 if (msg->saved.base != NULL) {
639 if (msg->free_saved != 0)
640 isc_mem_put(msg->mctx, msg->saved.base,
642 msg->saved.base = NULL;
643 msg->saved.length = 0;
647 * cleanup the buffer cleanup list
649 dynbuf = ISC_LIST_HEAD(msg->cleanup);
650 while (dynbuf != NULL) {
651 next_dynbuf = ISC_LIST_NEXT(dynbuf, link);
652 ISC_LIST_UNLINK(msg->cleanup, dynbuf, link);
653 isc_buffer_free(&dynbuf);
654 dynbuf = next_dynbuf;
658 * Set other bits to normal default values.
663 ENSURE(isc_mempool_getallocated(msg->namepool) == 0);
664 ENSURE(isc_mempool_getallocated(msg->rdspool) == 0);
668 spacefortsig(dns_tsigkey_t *key, int otherlen) {
674 * The space required for an TSIG record is:
676 * n1 bytes for the name
677 * 2 bytes for the type
678 * 2 bytes for the class
679 * 4 bytes for the ttl
680 * 2 bytes for the rdlength
681 * n2 bytes for the algorithm name
682 * 6 bytes for the time signed
683 * 2 bytes for the fudge
684 * 2 bytes for the MAC size
685 * x bytes for the MAC
686 * 2 bytes for the original id
687 * 2 bytes for the error
688 * 2 bytes for the other data length
689 * y bytes for the other data (at most)
690 * ---------------------------------
691 * 26 + n1 + n2 + x + y bytes
694 dns_name_toregion(&key->name, &r1);
695 dns_name_toregion(key->algorithm, &r2);
696 if (key->key == NULL)
699 result = dst_key_sigsize(key->key, &x);
700 if (result != ISC_R_SUCCESS)
703 return (26 + r1.length + r2.length + x + otherlen);
707 dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp)
711 isc_buffer_t *dynbuf;
714 REQUIRE(mctx != NULL);
715 REQUIRE(msgp != NULL);
716 REQUIRE(*msgp == NULL);
717 REQUIRE(intent == DNS_MESSAGE_INTENTPARSE
718 || intent == DNS_MESSAGE_INTENTRENDER);
720 m = isc_mem_get(mctx, sizeof(dns_message_t));
722 return (ISC_R_NOMEMORY);
725 * No allocations until further notice. Just initialize all lists
726 * and other members that are freed in the cleanup phase here.
729 m->magic = DNS_MESSAGE_MAGIC;
730 m->from_to_wire = intent;
733 for (i = 0; i < DNS_SECTION_MAX; i++)
734 ISC_LIST_INIT(m->sections[i]);
737 ISC_LIST_INIT(m->scratchpad);
738 ISC_LIST_INIT(m->cleanup);
741 ISC_LIST_INIT(m->rdatas);
742 ISC_LIST_INIT(m->rdatalists);
743 ISC_LIST_INIT(m->offsets);
744 ISC_LIST_INIT(m->freerdata);
745 ISC_LIST_INIT(m->freerdatalist);
748 * Ok, it is safe to allocate (and then "goto cleanup" if failure)
751 result = isc_mempool_create(m->mctx, sizeof(dns_name_t), &m->namepool);
752 if (result != ISC_R_SUCCESS)
754 isc_mempool_setfreemax(m->namepool, NAME_COUNT);
755 isc_mempool_setname(m->namepool, "msg:names");
757 result = isc_mempool_create(m->mctx, sizeof(dns_rdataset_t),
759 if (result != ISC_R_SUCCESS)
761 isc_mempool_setfreemax(m->rdspool, NAME_COUNT);
762 isc_mempool_setname(m->rdspool, "msg:rdataset");
765 result = isc_buffer_allocate(mctx, &dynbuf, SCRATCHPAD_SIZE);
766 if (result != ISC_R_SUCCESS)
768 ISC_LIST_APPEND(m->scratchpad, dynbuf, link);
773 return (ISC_R_SUCCESS);
776 * Cleanup for error returns.
779 dynbuf = ISC_LIST_HEAD(m->scratchpad);
780 if (dynbuf != NULL) {
781 ISC_LIST_UNLINK(m->scratchpad, dynbuf, link);
782 isc_buffer_free(&dynbuf);
784 if (m->namepool != NULL)
785 isc_mempool_destroy(&m->namepool);
786 if (m->rdspool != NULL)
787 isc_mempool_destroy(&m->rdspool);
789 isc_mem_put(mctx, m, sizeof(dns_message_t));
791 return (ISC_R_NOMEMORY);
795 dns_message_reset(dns_message_t *msg, unsigned int intent) {
796 REQUIRE(DNS_MESSAGE_VALID(msg));
797 REQUIRE(intent == DNS_MESSAGE_INTENTPARSE
798 || intent == DNS_MESSAGE_INTENTRENDER);
800 msgreset(msg, ISC_FALSE);
801 msg->from_to_wire = intent;
805 dns_message_destroy(dns_message_t **msgp) {
808 REQUIRE(msgp != NULL);
809 REQUIRE(DNS_MESSAGE_VALID(*msgp));
814 msgreset(msg, ISC_TRUE);
815 isc_mempool_destroy(&msg->namepool);
816 isc_mempool_destroy(&msg->rdspool);
818 isc_mem_put(msg->mctx, msg, sizeof(dns_message_t));
822 findname(dns_name_t **foundname, dns_name_t *target,
823 dns_namelist_t *section)
827 for (curr = ISC_LIST_TAIL(*section);
829 curr = ISC_LIST_PREV(curr, link)) {
830 if (dns_name_equal(curr, target)) {
831 if (foundname != NULL)
833 return (ISC_R_SUCCESS);
837 return (ISC_R_NOTFOUND);
841 dns_message_find(dns_name_t *name, dns_rdataclass_t rdclass,
842 dns_rdatatype_t type, dns_rdatatype_t covers,
843 dns_rdataset_t **rdataset)
845 dns_rdataset_t *curr;
847 if (rdataset != NULL) {
848 REQUIRE(*rdataset == NULL);
851 for (curr = ISC_LIST_TAIL(name->list);
853 curr = ISC_LIST_PREV(curr, link)) {
854 if (curr->rdclass == rdclass &&
855 curr->type == type && curr->covers == covers) {
856 if (rdataset != NULL)
858 return (ISC_R_SUCCESS);
862 return (ISC_R_NOTFOUND);
866 dns_message_findtype(dns_name_t *name, dns_rdatatype_t type,
867 dns_rdatatype_t covers, dns_rdataset_t **rdataset)
869 dns_rdataset_t *curr;
871 REQUIRE(name != NULL);
872 if (rdataset != NULL) {
873 REQUIRE(*rdataset == NULL);
876 for (curr = ISC_LIST_TAIL(name->list);
878 curr = ISC_LIST_PREV(curr, link)) {
879 if (curr->type == type && curr->covers == covers) {
880 if (rdataset != NULL)
882 return (ISC_R_SUCCESS);
886 return (ISC_R_NOTFOUND);
890 * Read a name from buffer "source".
893 getname(dns_name_t *name, isc_buffer_t *source, dns_message_t *msg,
894 dns_decompress_t *dctx)
896 isc_buffer_t *scratch;
900 scratch = currentbuffer(msg);
903 * First try: use current buffer.
904 * Second try: allocate a new buffer and use that.
908 result = dns_name_fromwire(name, source, dctx, ISC_FALSE,
911 if (result == ISC_R_NOSPACE) {
914 result = newbuffer(msg, SCRATCHPAD_SIZE);
915 if (result != ISC_R_SUCCESS)
918 scratch = currentbuffer(msg);
919 dns_name_reset(name);
925 INSIST(0); /* Cannot get here... */
926 return (ISC_R_UNEXPECTED);
930 getrdata(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
931 dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
932 unsigned int rdatalen, dns_rdata_t *rdata)
934 isc_buffer_t *scratch;
937 unsigned int trysize;
939 scratch = currentbuffer(msg);
941 isc_buffer_setactive(source, rdatalen);
944 * First try: use current buffer.
945 * Second try: allocate a new buffer of size
946 * max(SCRATCHPAD_SIZE, 2 * compressed_rdatalen)
947 * (the data will fit if it was not more than 50% compressed)
948 * Subsequent tries: double buffer size on each try.
952 /* XXX possibly change this to a while (tries < 2) loop */
954 result = dns_rdata_fromwire(rdata, rdclass, rdtype,
958 if (result == ISC_R_NOSPACE) {
960 trysize = 2 * rdatalen;
961 if (trysize < SCRATCHPAD_SIZE)
962 trysize = SCRATCHPAD_SIZE;
964 INSIST(trysize != 0);
965 if (trysize >= 65535)
966 return (ISC_R_NOSPACE);
967 /* XXX DNS_R_RRTOOLONG? */
971 result = newbuffer(msg, trysize);
972 if (result != ISC_R_SUCCESS)
975 scratch = currentbuffer(msg);
985 seen_problem = ISC_TRUE; \
987 result = DNS_R_FORMERR; \
993 getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
994 unsigned int options)
1000 dns_offsets_t *offsets;
1001 dns_rdataset_t *rdataset;
1002 dns_rdatalist_t *rdatalist;
1003 isc_result_t result;
1004 dns_rdatatype_t rdtype;
1005 dns_rdataclass_t rdclass;
1006 dns_namelist_t *section;
1007 isc_boolean_t free_name;
1008 isc_boolean_t best_effort;
1009 isc_boolean_t seen_problem;
1011 section = &msg->sections[DNS_SECTION_QUESTION];
1013 best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT);
1014 seen_problem = ISC_FALSE;
1020 for (count = 0; count < msg->counts[DNS_SECTION_QUESTION]; count++) {
1021 name = isc_mempool_get(msg->namepool);
1023 return (ISC_R_NOMEMORY);
1024 free_name = ISC_TRUE;
1026 offsets = newoffsets(msg);
1027 if (offsets == NULL) {
1028 result = ISC_R_NOMEMORY;
1031 dns_name_init(name, *offsets);
1034 * Parse the name out of this packet.
1036 isc_buffer_remainingregion(source, &r);
1037 isc_buffer_setactive(source, r.length);
1038 result = getname(name, source, msg, dctx);
1039 if (result != ISC_R_SUCCESS)
1043 * Run through the section, looking to see if this name
1044 * is already there. If it is found, put back the allocated
1045 * name since we no longer need it, and set our name pointer
1046 * to point to the name we found.
1048 result = findname(&name2, name, section);
1051 * If it is the first name in the section, accept it.
1053 * If it is not, but is not the same as the name already
1054 * in the question section, append to the section. Note that
1055 * here in the question section this is illegal, so return
1056 * FORMERR. In the future, check the opcode to see if
1057 * this should be legal or not. In either case we no longer
1058 * need this name pointer.
1060 if (result != ISC_R_SUCCESS) {
1061 if (!ISC_LIST_EMPTY(*section))
1063 ISC_LIST_APPEND(*section, name, link);
1064 free_name = ISC_FALSE;
1066 isc_mempool_put(msg->namepool, name);
1069 free_name = ISC_FALSE;
1073 * Get type and class.
1075 isc_buffer_remainingregion(source, &r);
1077 result = ISC_R_UNEXPECTEDEND;
1080 rdtype = isc_buffer_getuint16(source);
1081 rdclass = isc_buffer_getuint16(source);
1084 * If this class is different than the one we already read,
1087 if (msg->state == DNS_SECTION_ANY) {
1088 msg->state = DNS_SECTION_QUESTION;
1089 msg->rdclass = rdclass;
1090 } else if (msg->rdclass != rdclass)
1094 * Can't ask the same question twice.
1096 result = dns_message_find(name, rdclass, rdtype, 0, NULL);
1097 if (result == ISC_R_SUCCESS)
1101 * Allocate a new rdatalist.
1103 rdatalist = newrdatalist(msg);
1104 if (rdatalist == NULL) {
1105 result = ISC_R_NOMEMORY;
1108 rdataset = isc_mempool_get(msg->rdspool);
1109 if (rdataset == NULL) {
1110 result = ISC_R_NOMEMORY;
1115 * Convert rdatalist to rdataset, and attach the latter to
1118 rdatalist->type = rdtype;
1119 rdatalist->covers = 0;
1120 rdatalist->rdclass = rdclass;
1122 ISC_LIST_INIT(rdatalist->rdata);
1124 dns_rdataset_init(rdataset);
1125 result = dns_rdatalist_tordataset(rdatalist, rdataset);
1126 if (result != ISC_R_SUCCESS)
1129 rdataset->attributes |= DNS_RDATASETATTR_QUESTION;
1131 ISC_LIST_APPEND(name->list, rdataset, link);
1136 return (DNS_R_RECOVERABLE);
1137 return (ISC_R_SUCCESS);
1140 if (rdataset != NULL) {
1141 INSIST(!dns_rdataset_isassociated(rdataset));
1142 isc_mempool_put(msg->rdspool, rdataset);
1145 if (rdatalist != NULL)
1146 isc_mempool_put(msg->rdlpool, rdatalist);
1149 isc_mempool_put(msg->namepool, name);
1154 static isc_boolean_t
1155 update(dns_section_t section, dns_rdataclass_t rdclass) {
1156 if (section == DNS_SECTION_PREREQUISITE)
1157 return (ISC_TF(rdclass == dns_rdataclass_any ||
1158 rdclass == dns_rdataclass_none));
1159 if (section == DNS_SECTION_UPDATE)
1160 return (ISC_TF(rdclass == dns_rdataclass_any));
1165 getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
1166 dns_section_t sectionid, unsigned int options)
1169 unsigned int count, rdatalen;
1172 dns_offsets_t *offsets;
1173 dns_rdataset_t *rdataset;
1174 dns_rdatalist_t *rdatalist;
1175 isc_result_t result;
1176 dns_rdatatype_t rdtype, covers;
1177 dns_rdataclass_t rdclass;
1180 dns_namelist_t *section;
1181 isc_boolean_t free_name, free_rdataset;
1182 isc_boolean_t preserve_order, best_effort, seen_problem;
1183 isc_boolean_t issigzero;
1185 preserve_order = ISC_TF(options & DNS_MESSAGEPARSE_PRESERVEORDER);
1186 best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT);
1187 seen_problem = ISC_FALSE;
1189 for (count = 0; count < msg->counts[sectionid]; count++) {
1190 int recstart = source->current;
1191 isc_boolean_t skip_name_search, skip_type_search;
1193 section = &msg->sections[sectionid];
1195 skip_name_search = ISC_FALSE;
1196 skip_type_search = ISC_FALSE;
1197 free_rdataset = ISC_FALSE;
1199 name = isc_mempool_get(msg->namepool);
1201 return (ISC_R_NOMEMORY);
1202 free_name = ISC_TRUE;
1204 offsets = newoffsets(msg);
1205 if (offsets == NULL) {
1206 result = ISC_R_NOMEMORY;
1209 dns_name_init(name, *offsets);
1212 * Parse the name out of this packet.
1214 isc_buffer_remainingregion(source, &r);
1215 isc_buffer_setactive(source, r.length);
1216 result = getname(name, source, msg, dctx);
1217 if (result != ISC_R_SUCCESS)
1221 * Get type, class, ttl, and rdatalen. Verify that at least
1222 * rdatalen bytes remain. (Some of this is deferred to
1225 isc_buffer_remainingregion(source, &r);
1226 if (r.length < 2 + 2 + 4 + 2) {
1227 result = ISC_R_UNEXPECTEDEND;
1230 rdtype = isc_buffer_getuint16(source);
1231 rdclass = isc_buffer_getuint16(source);
1234 * If there was no question section, we may not yet have
1235 * established a class. Do so now.
1237 if (msg->state == DNS_SECTION_ANY &&
1238 rdtype != dns_rdatatype_opt && /* class is UDP SIZE */
1239 rdtype != dns_rdatatype_tsig && /* class is ANY */
1240 rdtype != dns_rdatatype_tkey) { /* class is undefined */
1241 msg->rdclass = rdclass;
1242 msg->state = DNS_SECTION_QUESTION;
1246 * If this class is different than the one in the question
1249 if (msg->opcode != dns_opcode_update
1250 && rdtype != dns_rdatatype_tsig
1251 && rdtype != dns_rdatatype_opt
1252 && rdtype != dns_rdatatype_dnskey /* in a TKEY query */
1253 && rdtype != dns_rdatatype_sig /* SIG(0) */
1254 && rdtype != dns_rdatatype_tkey /* Win2000 TKEY */
1255 && msg->rdclass != dns_rdataclass_any
1256 && msg->rdclass != rdclass)
1260 * Special type handling for TSIG, OPT, and TKEY.
1262 if (rdtype == dns_rdatatype_tsig) {
1264 * If it is a tsig, verify that it is in the
1265 * additional data section.
1267 if (sectionid != DNS_SECTION_ADDITIONAL ||
1268 rdclass != dns_rdataclass_any ||
1269 count != msg->counts[sectionid] - 1)
1271 msg->sigstart = recstart;
1272 skip_name_search = ISC_TRUE;
1273 skip_type_search = ISC_TRUE;
1274 } else if (rdtype == dns_rdatatype_opt) {
1276 * The name of an OPT record must be ".", it
1277 * must be in the additional data section, and
1278 * it must be the first OPT we've seen.
1280 if (!dns_name_equal(dns_rootname, name) ||
1283 skip_name_search = ISC_TRUE;
1284 skip_type_search = ISC_TRUE;
1285 } else if (rdtype == dns_rdatatype_tkey) {
1287 * A TKEY must be in the additional section if this
1288 * is a query, and the answer section if this is a
1289 * response. Unless it's a Win2000 client.
1291 * Its class is ignored.
1293 dns_section_t tkeysection;
1295 if ((msg->flags & DNS_MESSAGEFLAG_QR) == 0)
1296 tkeysection = DNS_SECTION_ADDITIONAL;
1298 tkeysection = DNS_SECTION_ANSWER;
1299 if (sectionid != tkeysection &&
1300 sectionid != DNS_SECTION_ANSWER)
1305 * ... now get ttl and rdatalen, and check buffer.
1307 ttl = isc_buffer_getuint32(source);
1308 rdatalen = isc_buffer_getuint16(source);
1309 r.length -= (2 + 2 + 4 + 2);
1310 if (r.length < rdatalen) {
1311 result = ISC_R_UNEXPECTEDEND;
1316 * Read the rdata from the wire format. Interpret the
1317 * rdata according to its actual class, even if it had a
1318 * DynDNS meta-class in the packet (unless this is a TSIG).
1319 * Then put the meta-class back into the finished rdata.
1321 rdata = newrdata(msg);
1322 if (rdata == NULL) {
1323 result = ISC_R_NOMEMORY;
1326 if (msg->opcode == dns_opcode_update &&
1327 update(sectionid, rdclass)) {
1328 if (rdatalen != 0) {
1329 result = DNS_R_FORMERR;
1333 * When the rdata is empty, the data pointer is
1334 * never dereferenced, but it must still be non-NULL.
1335 * Casting 1 rather than "" avoids warnings about
1336 * discarding the const attribute of a string,
1337 * for compilers that would warn about such things.
1339 rdata->data = (unsigned char *)1;
1341 rdata->rdclass = rdclass;
1342 rdata->type = rdtype;
1343 rdata->flags = DNS_RDATA_UPDATE;
1344 result = ISC_R_SUCCESS;
1345 } else if (rdclass == dns_rdataclass_none &&
1346 msg->opcode == dns_opcode_update &&
1347 sectionid == DNS_SECTION_UPDATE) {
1348 result = getrdata(source, msg, dctx, msg->rdclass,
1349 rdtype, rdatalen, rdata);
1351 result = getrdata(source, msg, dctx, rdclass,
1352 rdtype, rdatalen, rdata);
1353 if (result != ISC_R_SUCCESS)
1355 rdata->rdclass = rdclass;
1356 issigzero = ISC_FALSE;
1357 if (rdtype == dns_rdatatype_rrsig &&
1358 rdata->flags == 0) {
1359 covers = dns_rdata_covers(rdata);
1362 } else if (rdtype == dns_rdatatype_sig /* SIG(0) */ &&
1363 rdata->flags == 0) {
1364 covers = dns_rdata_covers(rdata);
1366 if (sectionid != DNS_SECTION_ADDITIONAL ||
1367 count != msg->counts[sectionid] - 1)
1369 msg->sigstart = recstart;
1370 skip_name_search = ISC_TRUE;
1371 skip_type_search = ISC_TRUE;
1372 issigzero = ISC_TRUE;
1378 * If we are doing a dynamic update or this is a meta-type,
1379 * don't bother searching for a name, just append this one
1380 * to the end of the message.
1382 if (preserve_order || msg->opcode == dns_opcode_update ||
1384 if (rdtype != dns_rdatatype_opt &&
1385 rdtype != dns_rdatatype_tsig &&
1388 ISC_LIST_APPEND(*section, name, link);
1389 free_name = ISC_FALSE;
1393 * Run through the section, looking to see if this name
1394 * is already there. If it is found, put back the
1395 * allocated name since we no longer need it, and set
1396 * our name pointer to point to the name we found.
1398 result = findname(&name2, name, section);
1401 * If it is a new name, append to the section.
1403 if (result == ISC_R_SUCCESS) {
1404 isc_mempool_put(msg->namepool, name);
1407 ISC_LIST_APPEND(*section, name, link);
1409 free_name = ISC_FALSE;
1413 * Search name for the particular type and class.
1414 * Skip this stage if in update mode or this is a meta-type.
1416 if (preserve_order || msg->opcode == dns_opcode_update ||
1418 result = ISC_R_NOTFOUND;
1421 * If this is a type that can only occur in
1422 * the question section, fail.
1424 if (dns_rdatatype_questiononly(rdtype))
1428 result = dns_message_find(name, rdclass, rdtype,
1433 * If we found an rdataset that matches, we need to
1434 * append this rdata to that set. If we did not, we need
1435 * to create a new rdatalist, store the important bits there,
1436 * convert it to an rdataset, and link the latter to the name.
1437 * Yuck. When appending, make certain that the type isn't
1438 * a singleton type, such as SOA or CNAME.
1440 * Note that this check will be bypassed when preserving order,
1441 * the opcode is an update, or the type search is skipped.
1443 if (result == ISC_R_SUCCESS) {
1444 if (dns_rdatatype_issingleton(rdtype)) {
1446 dns_rdatalist_fromrdataset(rdataset,
1448 first = ISC_LIST_HEAD(rdatalist->rdata);
1449 INSIST(first != NULL);
1450 if (dns_rdata_compare(rdata, first) != 0)
1455 if (result == ISC_R_NOTFOUND) {
1456 rdataset = isc_mempool_get(msg->rdspool);
1457 if (rdataset == NULL) {
1458 result = ISC_R_NOMEMORY;
1461 free_rdataset = ISC_TRUE;
1463 rdatalist = newrdatalist(msg);
1464 if (rdatalist == NULL) {
1465 result = ISC_R_NOMEMORY;
1469 rdatalist->type = rdtype;
1470 rdatalist->covers = covers;
1471 rdatalist->rdclass = rdclass;
1472 rdatalist->ttl = ttl;
1473 ISC_LIST_INIT(rdatalist->rdata);
1475 dns_rdataset_init(rdataset);
1476 RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist,
1480 if (rdtype != dns_rdatatype_opt &&
1481 rdtype != dns_rdatatype_tsig &&
1484 ISC_LIST_APPEND(name->list, rdataset, link);
1485 free_rdataset = ISC_FALSE;
1492 * Section 5.2 of RFC2181 says we should drop
1493 * nonauthoritative rrsets where the TTLs differ, but we
1494 * currently treat them the as if they were authoritative and
1497 if (ttl != rdataset->ttl) {
1498 rdataset->attributes |= DNS_RDATASETATTR_TTLADJUSTED;
1499 if (ttl < rdataset->ttl)
1500 rdataset->ttl = ttl;
1503 /* Append this rdata to the rdataset. */
1504 dns_rdatalist_fromrdataset(rdataset, &rdatalist);
1505 ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
1508 * If this is an OPT record, remember it. Also, set
1509 * the extended rcode. Note that msg->opt will only be set
1510 * if best-effort parsing is enabled.
1512 if (rdtype == dns_rdatatype_opt && msg->opt == NULL) {
1515 msg->opt = rdataset;
1517 free_rdataset = ISC_FALSE;
1518 ercode = (dns_rcode_t)
1519 ((msg->opt->ttl & DNS_MESSAGE_EDNSRCODE_MASK)
1521 msg->rcode |= ercode;
1522 isc_mempool_put(msg->namepool, name);
1523 free_name = ISC_FALSE;
1527 * If this is an SIG(0) or TSIG record, remember it. Note
1528 * that msg->sig0 or msg->tsig will only be set if best-effort
1529 * parsing is enabled.
1531 if (issigzero && msg->sig0 == NULL) {
1532 msg->sig0 = rdataset;
1533 msg->sig0name = name;
1535 free_rdataset = ISC_FALSE;
1536 free_name = ISC_FALSE;
1537 } else if (rdtype == dns_rdatatype_tsig && msg->tsig == NULL) {
1538 msg->tsig = rdataset;
1539 msg->tsigname = name;
1540 /* Windows doesn't like TSIG names to be compressed. */
1541 msg->tsigname->attributes |= DNS_NAMEATTR_NOCOMPRESS;
1543 free_rdataset = ISC_FALSE;
1544 free_name = ISC_FALSE;
1549 isc_mempool_put(msg->namepool, name);
1551 isc_mempool_put(msg->rdspool, rdataset);
1552 free_name = free_rdataset = ISC_FALSE;
1554 INSIST(free_name == ISC_FALSE);
1555 INSIST(free_rdataset == ISC_FALSE);
1559 return (DNS_R_RECOVERABLE);
1560 return (ISC_R_SUCCESS);
1564 isc_mempool_put(msg->namepool, name);
1566 isc_mempool_put(msg->rdspool, rdataset);
1572 dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
1573 unsigned int options)
1576 dns_decompress_t dctx;
1578 isc_uint16_t tmpflags;
1579 isc_buffer_t origsource;
1580 isc_boolean_t seen_problem;
1581 isc_boolean_t ignore_tc;
1583 REQUIRE(DNS_MESSAGE_VALID(msg));
1584 REQUIRE(source != NULL);
1585 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE);
1587 seen_problem = ISC_FALSE;
1588 ignore_tc = ISC_TF(options & DNS_MESSAGEPARSE_IGNORETRUNCATION);
1590 origsource = *source;
1593 msg->question_ok = 0;
1595 isc_buffer_remainingregion(source, &r);
1596 if (r.length < DNS_MESSAGE_HEADERLEN)
1597 return (ISC_R_UNEXPECTEDEND);
1599 msg->id = isc_buffer_getuint16(source);
1600 tmpflags = isc_buffer_getuint16(source);
1601 msg->opcode = ((tmpflags & DNS_MESSAGE_OPCODE_MASK)
1602 >> DNS_MESSAGE_OPCODE_SHIFT);
1603 msg->rcode = (dns_rcode_t)(tmpflags & DNS_MESSAGE_RCODE_MASK);
1604 msg->flags = (tmpflags & DNS_MESSAGE_FLAG_MASK);
1605 msg->counts[DNS_SECTION_QUESTION] = isc_buffer_getuint16(source);
1606 msg->counts[DNS_SECTION_ANSWER] = isc_buffer_getuint16(source);
1607 msg->counts[DNS_SECTION_AUTHORITY] = isc_buffer_getuint16(source);
1608 msg->counts[DNS_SECTION_ADDITIONAL] = isc_buffer_getuint16(source);
1615 dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_ANY);
1617 dns_decompress_setmethods(&dctx, DNS_COMPRESS_GLOBAL14);
1619 ret = getquestions(source, msg, &dctx, options);
1620 if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
1622 if (ret == DNS_R_RECOVERABLE) {
1623 seen_problem = ISC_TRUE;
1624 ret = ISC_R_SUCCESS;
1626 if (ret != ISC_R_SUCCESS)
1628 msg->question_ok = 1;
1630 ret = getsection(source, msg, &dctx, DNS_SECTION_ANSWER, options);
1631 if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
1633 if (ret == DNS_R_RECOVERABLE) {
1634 seen_problem = ISC_TRUE;
1635 ret = ISC_R_SUCCESS;
1637 if (ret != ISC_R_SUCCESS)
1640 ret = getsection(source, msg, &dctx, DNS_SECTION_AUTHORITY, options);
1641 if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
1643 if (ret == DNS_R_RECOVERABLE) {
1644 seen_problem = ISC_TRUE;
1645 ret = ISC_R_SUCCESS;
1647 if (ret != ISC_R_SUCCESS)
1650 ret = getsection(source, msg, &dctx, DNS_SECTION_ADDITIONAL, options);
1651 if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
1653 if (ret == DNS_R_RECOVERABLE) {
1654 seen_problem = ISC_TRUE;
1655 ret = ISC_R_SUCCESS;
1657 if (ret != ISC_R_SUCCESS)
1660 isc_buffer_remainingregion(source, &r);
1661 if (r.length != 0) {
1662 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1663 DNS_LOGMODULE_MESSAGE, ISC_LOG_DEBUG(3),
1664 "message has %u byte(s) of trailing garbage",
1669 if ((options & DNS_MESSAGEPARSE_CLONEBUFFER) == 0)
1670 isc_buffer_usedregion(&origsource, &msg->saved);
1672 msg->saved.length = isc_buffer_usedlength(&origsource);
1673 msg->saved.base = isc_mem_get(msg->mctx, msg->saved.length);
1674 if (msg->saved.base == NULL)
1675 return (ISC_R_NOMEMORY);
1676 memmove(msg->saved.base, isc_buffer_base(&origsource),
1678 msg->free_saved = 1;
1681 if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
1682 return (DNS_R_RECOVERABLE);
1683 if (seen_problem == ISC_TRUE)
1684 return (DNS_R_RECOVERABLE);
1685 return (ISC_R_SUCCESS);
1689 dns_message_renderbegin(dns_message_t *msg, dns_compress_t *cctx,
1690 isc_buffer_t *buffer)
1694 REQUIRE(DNS_MESSAGE_VALID(msg));
1695 REQUIRE(buffer != NULL);
1696 REQUIRE(msg->buffer == NULL);
1697 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
1702 * Erase the contents of this buffer.
1704 isc_buffer_clear(buffer);
1707 * Make certain there is enough for at least the header in this
1710 isc_buffer_availableregion(buffer, &r);
1711 if (r.length < DNS_MESSAGE_HEADERLEN)
1712 return (ISC_R_NOSPACE);
1714 if (r.length < msg->reserved)
1715 return (ISC_R_NOSPACE);
1718 * Reserve enough space for the header in this buffer.
1720 isc_buffer_add(buffer, DNS_MESSAGE_HEADERLEN);
1722 msg->buffer = buffer;
1724 return (ISC_R_SUCCESS);
1728 dns_message_renderchangebuffer(dns_message_t *msg, isc_buffer_t *buffer) {
1731 REQUIRE(DNS_MESSAGE_VALID(msg));
1732 REQUIRE(buffer != NULL);
1733 REQUIRE(msg->buffer != NULL);
1736 * Ensure that the new buffer is empty, and has enough space to
1737 * hold the current contents.
1739 isc_buffer_clear(buffer);
1741 isc_buffer_availableregion(buffer, &rn);
1742 isc_buffer_usedregion(msg->buffer, &r);
1743 REQUIRE(rn.length > r.length);
1746 * Copy the contents from the old to the new buffer.
1748 isc_buffer_add(buffer, r.length);
1749 memmove(rn.base, r.base, r.length);
1751 msg->buffer = buffer;
1753 return (ISC_R_SUCCESS);
1757 dns_message_renderrelease(dns_message_t *msg, unsigned int space) {
1758 REQUIRE(DNS_MESSAGE_VALID(msg));
1759 REQUIRE(space <= msg->reserved);
1761 msg->reserved -= space;
1765 dns_message_renderreserve(dns_message_t *msg, unsigned int space) {
1768 REQUIRE(DNS_MESSAGE_VALID(msg));
1770 if (msg->buffer != NULL) {
1771 isc_buffer_availableregion(msg->buffer, &r);
1772 if (r.length < (space + msg->reserved))
1773 return (ISC_R_NOSPACE);
1776 msg->reserved += space;
1778 return (ISC_R_SUCCESS);
1781 static inline isc_boolean_t
1782 wrong_priority(dns_rdataset_t *rds, int pass, dns_rdatatype_t preferred_glue) {
1786 * If we are not rendering class IN, this ordering is bogus.
1788 if (rds->rdclass != dns_rdataclass_in)
1791 switch (rds->type) {
1792 case dns_rdatatype_a:
1793 case dns_rdatatype_aaaa:
1794 if (preferred_glue == rds->type)
1799 case dns_rdatatype_rrsig:
1800 case dns_rdatatype_dnskey:
1807 if (pass_needed >= pass)
1813 #ifdef ALLOW_FILTER_AAAA_ON_V4
1815 * Decide whether to not answer with an AAAA record and its RRSIG
1817 static inline isc_boolean_t
1818 norender_rdataset(const dns_rdataset_t *rdataset, unsigned int options)
1820 switch (rdataset->type) {
1821 case dns_rdatatype_aaaa:
1822 if ((options & DNS_MESSAGERENDER_FILTER_AAAA) == 0)
1826 case dns_rdatatype_rrsig:
1827 if ((options & DNS_MESSAGERENDER_FILTER_AAAA) == 0 ||
1828 rdataset->covers != dns_rdatatype_aaaa)
1836 if (rdataset->rdclass != dns_rdataclass_in)
1844 dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
1845 unsigned int options)
1847 dns_namelist_t *section;
1848 dns_name_t *name, *next_name;
1849 dns_rdataset_t *rdataset, *next_rdataset;
1850 unsigned int count, total;
1851 isc_result_t result;
1852 isc_buffer_t st; /* for rollbacks */
1854 isc_boolean_t partial = ISC_FALSE;
1855 unsigned int rd_options;
1856 dns_rdatatype_t preferred_glue = 0;
1858 REQUIRE(DNS_MESSAGE_VALID(msg));
1859 REQUIRE(msg->buffer != NULL);
1860 REQUIRE(VALID_NAMED_SECTION(sectionid));
1862 section = &msg->sections[sectionid];
1864 if ((sectionid == DNS_SECTION_ADDITIONAL)
1865 && (options & DNS_MESSAGERENDER_ORDERED) == 0) {
1866 if ((options & DNS_MESSAGERENDER_PREFER_A) != 0) {
1867 preferred_glue = dns_rdatatype_a;
1869 } else if ((options & DNS_MESSAGERENDER_PREFER_AAAA) != 0) {
1870 preferred_glue = dns_rdatatype_aaaa;
1877 if ((options & DNS_MESSAGERENDER_OMITDNSSEC) == 0)
1880 rd_options = DNS_RDATASETTOWIRE_OMITDNSSEC;
1883 * Shrink the space in the buffer by the reserved amount.
1885 msg->buffer->length -= msg->reserved;
1888 if (msg->reserved == 0 && (options & DNS_MESSAGERENDER_PARTIAL) != 0)
1892 * Render required glue first. Set TC if it won't fit.
1894 name = ISC_LIST_HEAD(*section);
1896 rdataset = ISC_LIST_HEAD(name->list);
1897 if (rdataset != NULL &&
1898 (rdataset->attributes & DNS_RDATASETATTR_REQUIREDGLUE) != 0 &&
1899 (rdataset->attributes & DNS_RDATASETATTR_RENDERED) == 0) {
1900 const void *order_arg = msg->order_arg;
1901 st = *(msg->buffer);
1904 result = dns_rdataset_towirepartial(rdataset,
1914 result = dns_rdataset_towiresorted(rdataset,
1923 if (partial && result == ISC_R_NOSPACE) {
1924 msg->flags |= DNS_MESSAGEFLAG_TC;
1925 msg->buffer->length += msg->reserved;
1926 msg->counts[sectionid] += total;
1929 if (result == ISC_R_NOSPACE)
1930 msg->flags |= DNS_MESSAGEFLAG_TC;
1931 if (result != ISC_R_SUCCESS) {
1932 INSIST(st.used < 65536);
1933 dns_compress_rollback(msg->cctx,
1934 (isc_uint16_t)st.used);
1935 *(msg->buffer) = st; /* rollback */
1936 msg->buffer->length += msg->reserved;
1937 msg->counts[sectionid] += total;
1940 rdataset->attributes |= DNS_RDATASETATTR_RENDERED;
1945 name = ISC_LIST_HEAD(*section);
1947 msg->buffer->length += msg->reserved;
1948 msg->counts[sectionid] += total;
1949 return (ISC_R_SUCCESS);
1952 while (name != NULL) {
1953 next_name = ISC_LIST_NEXT(name, link);
1955 rdataset = ISC_LIST_HEAD(name->list);
1956 while (rdataset != NULL) {
1957 next_rdataset = ISC_LIST_NEXT(rdataset, link);
1959 if ((rdataset->attributes &
1960 DNS_RDATASETATTR_RENDERED) != 0)
1963 if (((options & DNS_MESSAGERENDER_ORDERED)
1965 && (sectionid == DNS_SECTION_ADDITIONAL)
1966 && wrong_priority(rdataset, pass,
1970 #ifdef ALLOW_FILTER_AAAA_ON_V4
1972 * Suppress AAAAs if asked and we are
1973 * not doing DNSSEC or are breaking DNSSEC.
1974 * Say so in the AD bit if we break DNSSEC.
1976 if (norender_rdataset(rdataset, options) &&
1977 sectionid != DNS_SECTION_QUESTION) {
1978 if (sectionid == DNS_SECTION_ANSWER ||
1979 sectionid == DNS_SECTION_AUTHORITY)
1980 msg->flags &= ~DNS_MESSAGEFLAG_AD;
1981 if (OPTOUT(rdataset))
1982 msg->flags &= ~DNS_MESSAGEFLAG_AD;
1987 st = *(msg->buffer);
1991 result = dns_rdataset_towirepartial(
2002 result = dns_rdataset_towiresorted(
2015 * If out of space, record stats on what we
2016 * rendered so far, and return that status.
2018 * XXXMLG Need to change this when
2019 * dns_rdataset_towire() can render partial
2020 * sets starting at some arbitrary point in the
2021 * set. This will include setting a bit in the
2022 * rdataset to indicate that a partial
2023 * rendering was done, and some state saved
2024 * somewhere (probably in the message struct)
2025 * to indicate where to continue from.
2027 if (partial && result == ISC_R_NOSPACE) {
2028 msg->buffer->length += msg->reserved;
2029 msg->counts[sectionid] += total;
2032 if (result != ISC_R_SUCCESS) {
2033 INSIST(st.used < 65536);
2034 dns_compress_rollback(msg->cctx,
2035 (isc_uint16_t)st.used);
2036 *(msg->buffer) = st; /* rollback */
2037 msg->buffer->length += msg->reserved;
2038 msg->counts[sectionid] += total;
2043 * If we have rendered non-validated data,
2044 * ensure that the AD bit is not set.
2046 if (rdataset->trust != dns_trust_secure &&
2047 (sectionid == DNS_SECTION_ANSWER ||
2048 sectionid == DNS_SECTION_AUTHORITY))
2049 msg->flags &= ~DNS_MESSAGEFLAG_AD;
2050 if (OPTOUT(rdataset))
2051 msg->flags &= ~DNS_MESSAGEFLAG_AD;
2053 rdataset->attributes |=
2054 DNS_RDATASETATTR_RENDERED;
2057 rdataset = next_rdataset;
2062 } while (--pass != 0);
2064 msg->buffer->length += msg->reserved;
2065 msg->counts[sectionid] += total;
2067 return (ISC_R_SUCCESS);
2071 dns_message_renderheader(dns_message_t *msg, isc_buffer_t *target) {
2075 REQUIRE(DNS_MESSAGE_VALID(msg));
2076 REQUIRE(target != NULL);
2078 isc_buffer_availableregion(target, &r);
2079 REQUIRE(r.length >= DNS_MESSAGE_HEADERLEN);
2081 isc_buffer_putuint16(target, msg->id);
2083 tmp = ((msg->opcode << DNS_MESSAGE_OPCODE_SHIFT)
2084 & DNS_MESSAGE_OPCODE_MASK);
2085 tmp |= (msg->rcode & DNS_MESSAGE_RCODE_MASK);
2086 tmp |= (msg->flags & DNS_MESSAGE_FLAG_MASK);
2088 INSIST(msg->counts[DNS_SECTION_QUESTION] < 65536 &&
2089 msg->counts[DNS_SECTION_ANSWER] < 65536 &&
2090 msg->counts[DNS_SECTION_AUTHORITY] < 65536 &&
2091 msg->counts[DNS_SECTION_ADDITIONAL] < 65536);
2093 isc_buffer_putuint16(target, tmp);
2094 isc_buffer_putuint16(target,
2095 (isc_uint16_t)msg->counts[DNS_SECTION_QUESTION]);
2096 isc_buffer_putuint16(target,
2097 (isc_uint16_t)msg->counts[DNS_SECTION_ANSWER]);
2098 isc_buffer_putuint16(target,
2099 (isc_uint16_t)msg->counts[DNS_SECTION_AUTHORITY]);
2100 isc_buffer_putuint16(target,
2101 (isc_uint16_t)msg->counts[DNS_SECTION_ADDITIONAL]);
2105 dns_message_renderend(dns_message_t *msg) {
2106 isc_buffer_t tmpbuf;
2111 REQUIRE(DNS_MESSAGE_VALID(msg));
2112 REQUIRE(msg->buffer != NULL);
2114 if ((msg->rcode & ~DNS_MESSAGE_RCODE_MASK) != 0 && msg->opt == NULL) {
2116 * We have an extended rcode but are not using EDNS.
2118 return (DNS_R_FORMERR);
2122 * If we're adding a OPT, TSIG or SIG(0) to a truncated message,
2123 * clear all rdatasets from the message except for the question
2124 * before adding the OPT, TSIG or SIG(0). If the question doesn't
2125 * fit, don't include it.
2127 if ((msg->tsigkey != NULL || msg->sig0key != NULL || msg->opt) &&
2128 (msg->flags & DNS_MESSAGEFLAG_TC) != 0)
2132 msgresetnames(msg, DNS_SECTION_ANSWER);
2134 dns_message_renderreset(msg);
2136 isc_buffer_clear(msg->buffer);
2137 isc_buffer_add(msg->buffer, DNS_MESSAGE_HEADERLEN);
2138 dns_compress_rollback(msg->cctx, 0);
2139 result = dns_message_rendersection(msg, DNS_SECTION_QUESTION,
2141 if (result != ISC_R_SUCCESS && result != ISC_R_NOSPACE)
2146 * If we've got an OPT record, render it.
2148 if (msg->opt != NULL) {
2149 dns_message_renderrelease(msg, msg->opt_reserved);
2150 msg->opt_reserved = 0;
2152 * Set the extended rcode.
2154 msg->opt->ttl &= ~DNS_MESSAGE_EDNSRCODE_MASK;
2155 msg->opt->ttl |= ((msg->rcode << 20) &
2156 DNS_MESSAGE_EDNSRCODE_MASK);
2161 result = dns_rdataset_towire(msg->opt, dns_rootname,
2162 msg->cctx, msg->buffer, 0,
2164 msg->counts[DNS_SECTION_ADDITIONAL] += count;
2165 if (result != ISC_R_SUCCESS)
2170 * If we're adding a TSIG record, generate and render it.
2172 if (msg->tsigkey != NULL) {
2173 dns_message_renderrelease(msg, msg->sig_reserved);
2174 msg->sig_reserved = 0;
2175 result = dns_tsig_sign(msg);
2176 if (result != ISC_R_SUCCESS)
2179 result = dns_rdataset_towire(msg->tsig, msg->tsigname,
2180 msg->cctx, msg->buffer, 0,
2182 msg->counts[DNS_SECTION_ADDITIONAL] += count;
2183 if (result != ISC_R_SUCCESS)
2188 * If we're adding a SIG(0) record, generate and render it.
2190 if (msg->sig0key != NULL) {
2191 dns_message_renderrelease(msg, msg->sig_reserved);
2192 msg->sig_reserved = 0;
2193 result = dns_dnssec_signmessage(msg, msg->sig0key);
2194 if (result != ISC_R_SUCCESS)
2198 * Note: dns_rootname is used here, not msg->sig0name, since
2199 * the owner name of a SIG(0) is irrelevant, and will not
2200 * be set in a message being rendered.
2202 result = dns_rdataset_towire(msg->sig0, dns_rootname,
2203 msg->cctx, msg->buffer, 0,
2205 msg->counts[DNS_SECTION_ADDITIONAL] += count;
2206 if (result != ISC_R_SUCCESS)
2210 isc_buffer_usedregion(msg->buffer, &r);
2211 isc_buffer_init(&tmpbuf, r.base, r.length);
2213 dns_message_renderheader(msg, &tmpbuf);
2215 msg->buffer = NULL; /* forget about this buffer only on success XXX */
2217 return (ISC_R_SUCCESS);
2221 dns_message_renderreset(dns_message_t *msg) {
2224 dns_rdataset_t *rds;
2227 * Reset the message so that it may be rendered again.
2230 REQUIRE(DNS_MESSAGE_VALID(msg));
2231 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2235 for (i = 0; i < DNS_SECTION_MAX; i++) {
2236 msg->cursors[i] = NULL;
2238 for (name = ISC_LIST_HEAD(msg->sections[i]);
2240 name = ISC_LIST_NEXT(name, link)) {
2241 for (rds = ISC_LIST_HEAD(name->list);
2243 rds = ISC_LIST_NEXT(rds, link)) {
2244 rds->attributes &= ~DNS_RDATASETATTR_RENDERED;
2248 if (msg->tsigname != NULL)
2249 dns_message_puttempname(msg, &msg->tsigname);
2250 if (msg->tsig != NULL) {
2251 dns_rdataset_disassociate(msg->tsig);
2252 dns_message_puttemprdataset(msg, &msg->tsig);
2254 if (msg->sig0 != NULL) {
2255 dns_rdataset_disassociate(msg->sig0);
2256 dns_message_puttemprdataset(msg, &msg->sig0);
2261 dns_message_firstname(dns_message_t *msg, dns_section_t section) {
2262 REQUIRE(DNS_MESSAGE_VALID(msg));
2263 REQUIRE(VALID_NAMED_SECTION(section));
2265 msg->cursors[section] = ISC_LIST_HEAD(msg->sections[section]);
2267 if (msg->cursors[section] == NULL)
2268 return (ISC_R_NOMORE);
2270 return (ISC_R_SUCCESS);
2274 dns_message_nextname(dns_message_t *msg, dns_section_t section) {
2275 REQUIRE(DNS_MESSAGE_VALID(msg));
2276 REQUIRE(VALID_NAMED_SECTION(section));
2277 REQUIRE(msg->cursors[section] != NULL);
2279 msg->cursors[section] = ISC_LIST_NEXT(msg->cursors[section], link);
2281 if (msg->cursors[section] == NULL)
2282 return (ISC_R_NOMORE);
2284 return (ISC_R_SUCCESS);
2288 dns_message_currentname(dns_message_t *msg, dns_section_t section,
2291 REQUIRE(DNS_MESSAGE_VALID(msg));
2292 REQUIRE(VALID_NAMED_SECTION(section));
2293 REQUIRE(name != NULL && *name == NULL);
2294 REQUIRE(msg->cursors[section] != NULL);
2296 *name = msg->cursors[section];
2300 dns_message_findname(dns_message_t *msg, dns_section_t section,
2301 dns_name_t *target, dns_rdatatype_t type,
2302 dns_rdatatype_t covers, dns_name_t **name,
2303 dns_rdataset_t **rdataset)
2305 dns_name_t *foundname;
2306 isc_result_t result;
2309 * XXX These requirements are probably too intensive, especially
2310 * where things can be NULL, but as they are they ensure that if
2311 * something is NON-NULL, indicating that the caller expects it
2312 * to be filled in, that we can in fact fill it in.
2314 REQUIRE(msg != NULL);
2315 REQUIRE(VALID_SECTION(section));
2316 REQUIRE(target != NULL);
2318 REQUIRE(*name == NULL);
2319 if (type == dns_rdatatype_any) {
2320 REQUIRE(rdataset == NULL);
2322 if (rdataset != NULL)
2323 REQUIRE(*rdataset == NULL);
2326 result = findname(&foundname, target,
2327 &msg->sections[section]);
2329 if (result == ISC_R_NOTFOUND)
2330 return (DNS_R_NXDOMAIN);
2331 else if (result != ISC_R_SUCCESS)
2338 * And now look for the type.
2340 if (type == dns_rdatatype_any)
2341 return (ISC_R_SUCCESS);
2343 result = dns_message_findtype(foundname, type, covers, rdataset);
2344 if (result == ISC_R_NOTFOUND)
2345 return (DNS_R_NXRRSET);
2351 dns_message_movename(dns_message_t *msg, dns_name_t *name,
2352 dns_section_t fromsection,
2353 dns_section_t tosection)
2355 REQUIRE(msg != NULL);
2356 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2357 REQUIRE(name != NULL);
2358 REQUIRE(VALID_NAMED_SECTION(fromsection));
2359 REQUIRE(VALID_NAMED_SECTION(tosection));
2362 * Unlink the name from the old section
2364 ISC_LIST_UNLINK(msg->sections[fromsection], name, link);
2365 ISC_LIST_APPEND(msg->sections[tosection], name, link);
2369 dns_message_addname(dns_message_t *msg, dns_name_t *name,
2370 dns_section_t section)
2372 REQUIRE(msg != NULL);
2373 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2374 REQUIRE(name != NULL);
2375 REQUIRE(VALID_NAMED_SECTION(section));
2377 ISC_LIST_APPEND(msg->sections[section], name, link);
2381 dns_message_removename(dns_message_t *msg, dns_name_t *name,
2382 dns_section_t section)
2384 REQUIRE(msg != NULL);
2385 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2386 REQUIRE(name != NULL);
2387 REQUIRE(VALID_NAMED_SECTION(section));
2389 ISC_LIST_UNLINK(msg->sections[section], name, link);
2393 dns_message_gettempname(dns_message_t *msg, dns_name_t **item) {
2394 REQUIRE(DNS_MESSAGE_VALID(msg));
2395 REQUIRE(item != NULL && *item == NULL);
2397 *item = isc_mempool_get(msg->namepool);
2399 return (ISC_R_NOMEMORY);
2400 dns_name_init(*item, NULL);
2402 return (ISC_R_SUCCESS);
2406 dns_message_gettempoffsets(dns_message_t *msg, dns_offsets_t **item) {
2407 REQUIRE(DNS_MESSAGE_VALID(msg));
2408 REQUIRE(item != NULL && *item == NULL);
2410 *item = newoffsets(msg);
2412 return (ISC_R_NOMEMORY);
2414 return (ISC_R_SUCCESS);
2418 dns_message_gettemprdata(dns_message_t *msg, dns_rdata_t **item) {
2419 REQUIRE(DNS_MESSAGE_VALID(msg));
2420 REQUIRE(item != NULL && *item == NULL);
2422 *item = newrdata(msg);
2424 return (ISC_R_NOMEMORY);
2426 return (ISC_R_SUCCESS);
2430 dns_message_gettemprdataset(dns_message_t *msg, dns_rdataset_t **item) {
2431 REQUIRE(DNS_MESSAGE_VALID(msg));
2432 REQUIRE(item != NULL && *item == NULL);
2434 *item = isc_mempool_get(msg->rdspool);
2436 return (ISC_R_NOMEMORY);
2438 dns_rdataset_init(*item);
2440 return (ISC_R_SUCCESS);
2444 dns_message_gettemprdatalist(dns_message_t *msg, dns_rdatalist_t **item) {
2445 REQUIRE(DNS_MESSAGE_VALID(msg));
2446 REQUIRE(item != NULL && *item == NULL);
2448 *item = newrdatalist(msg);
2450 return (ISC_R_NOMEMORY);
2452 return (ISC_R_SUCCESS);
2456 dns_message_puttempname(dns_message_t *msg, dns_name_t **item) {
2457 REQUIRE(DNS_MESSAGE_VALID(msg));
2458 REQUIRE(item != NULL && *item != NULL);
2460 if (dns_name_dynamic(*item))
2461 dns_name_free(*item, msg->mctx);
2462 isc_mempool_put(msg->namepool, *item);
2467 dns_message_puttemprdata(dns_message_t *msg, dns_rdata_t **item) {
2468 REQUIRE(DNS_MESSAGE_VALID(msg));
2469 REQUIRE(item != NULL && *item != NULL);
2471 releaserdata(msg, *item);
2476 dns_message_puttemprdataset(dns_message_t *msg, dns_rdataset_t **item) {
2477 REQUIRE(DNS_MESSAGE_VALID(msg));
2478 REQUIRE(item != NULL && *item != NULL);
2480 REQUIRE(!dns_rdataset_isassociated(*item));
2481 isc_mempool_put(msg->rdspool, *item);
2486 dns_message_puttemprdatalist(dns_message_t *msg, dns_rdatalist_t **item) {
2487 REQUIRE(DNS_MESSAGE_VALID(msg));
2488 REQUIRE(item != NULL && *item != NULL);
2490 releaserdatalist(msg, *item);
2495 dns_message_peekheader(isc_buffer_t *source, dns_messageid_t *idp,
2496 unsigned int *flagsp)
2499 isc_buffer_t buffer;
2503 REQUIRE(source != NULL);
2507 isc_buffer_remainingregion(&buffer, &r);
2508 if (r.length < DNS_MESSAGE_HEADERLEN)
2509 return (ISC_R_UNEXPECTEDEND);
2511 id = isc_buffer_getuint16(&buffer);
2512 flags = isc_buffer_getuint16(&buffer);
2513 flags &= DNS_MESSAGE_FLAG_MASK;
2520 return (ISC_R_SUCCESS);
2524 dns_message_reply(dns_message_t *msg, isc_boolean_t want_question_section) {
2525 unsigned int clear_after;
2526 isc_result_t result;
2528 REQUIRE(DNS_MESSAGE_VALID(msg));
2529 REQUIRE((msg->flags & DNS_MESSAGEFLAG_QR) == 0);
2531 if (!msg->header_ok)
2532 return (DNS_R_FORMERR);
2533 if (msg->opcode != dns_opcode_query &&
2534 msg->opcode != dns_opcode_notify)
2535 want_question_section = ISC_FALSE;
2536 if (msg->opcode == dns_opcode_update)
2537 clear_after = DNS_SECTION_PREREQUISITE;
2538 else if (want_question_section) {
2539 if (!msg->question_ok)
2540 return (DNS_R_FORMERR);
2541 clear_after = DNS_SECTION_ANSWER;
2543 clear_after = DNS_SECTION_QUESTION;
2544 msg->from_to_wire = DNS_MESSAGE_INTENTRENDER;
2545 msgresetnames(msg, clear_after);
2547 msgresetsigs(msg, ISC_TRUE);
2548 msginitprivate(msg);
2550 * We now clear most flags and then set QR, ensuring that the
2551 * reply's flags will be in a reasonable state.
2553 msg->flags &= DNS_MESSAGE_REPLYPRESERVE;
2554 msg->flags |= DNS_MESSAGEFLAG_QR;
2557 * This saves the query TSIG status, if the query was signed, and
2558 * reserves space in the reply for the TSIG.
2560 if (msg->tsigkey != NULL) {
2561 unsigned int otherlen = 0;
2562 msg->querytsigstatus = msg->tsigstatus;
2563 msg->tsigstatus = dns_rcode_noerror;
2564 if (msg->querytsigstatus == dns_tsigerror_badtime)
2566 msg->sig_reserved = spacefortsig(msg->tsigkey, otherlen);
2567 result = dns_message_renderreserve(msg, msg->sig_reserved);
2568 if (result != ISC_R_SUCCESS) {
2569 msg->sig_reserved = 0;
2573 if (msg->saved.base != NULL) {
2574 msg->query.base = msg->saved.base;
2575 msg->query.length = msg->saved.length;
2576 msg->free_query = msg->free_saved;
2577 msg->saved.base = NULL;
2578 msg->saved.length = 0;
2579 msg->free_saved = 0;
2582 return (ISC_R_SUCCESS);
2586 dns_message_getopt(dns_message_t *msg) {
2589 * Get the OPT record for 'msg'.
2592 REQUIRE(DNS_MESSAGE_VALID(msg));
2598 dns_message_setopt(dns_message_t *msg, dns_rdataset_t *opt) {
2599 isc_result_t result;
2600 dns_rdata_t rdata = DNS_RDATA_INIT;
2603 * Set the OPT record for 'msg'.
2607 * The space required for an OPT record is:
2609 * 1 byte for the name
2610 * 2 bytes for the type
2611 * 2 bytes for the class
2612 * 4 bytes for the ttl
2613 * 2 bytes for the rdata length
2614 * ---------------------------------
2617 * plus the length of the rdata.
2620 REQUIRE(DNS_MESSAGE_VALID(msg));
2621 REQUIRE(opt->type == dns_rdatatype_opt);
2622 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2623 REQUIRE(msg->state == DNS_SECTION_ANY);
2627 result = dns_rdataset_first(opt);
2628 if (result != ISC_R_SUCCESS)
2630 dns_rdataset_current(opt, &rdata);
2631 msg->opt_reserved = 11 + rdata.length;
2632 result = dns_message_renderreserve(msg, msg->opt_reserved);
2633 if (result != ISC_R_SUCCESS) {
2634 msg->opt_reserved = 0;
2640 return (ISC_R_SUCCESS);
2643 dns_rdataset_disassociate(opt);
2644 dns_message_puttemprdataset(msg, &opt);
2649 dns_message_gettsig(dns_message_t *msg, dns_name_t **owner) {
2652 * Get the TSIG record and owner for 'msg'.
2655 REQUIRE(DNS_MESSAGE_VALID(msg));
2656 REQUIRE(owner == NULL || *owner == NULL);
2659 *owner = msg->tsigname;
2664 dns_message_settsigkey(dns_message_t *msg, dns_tsigkey_t *key) {
2665 isc_result_t result;
2668 * Set the TSIG key for 'msg'
2671 REQUIRE(DNS_MESSAGE_VALID(msg));
2672 REQUIRE(msg->state == DNS_SECTION_ANY);
2674 if (key == NULL && msg->tsigkey != NULL) {
2675 if (msg->sig_reserved != 0) {
2676 dns_message_renderrelease(msg, msg->sig_reserved);
2677 msg->sig_reserved = 0;
2679 dns_tsigkey_detach(&msg->tsigkey);
2682 REQUIRE(msg->tsigkey == NULL && msg->sig0key == NULL);
2683 dns_tsigkey_attach(key, &msg->tsigkey);
2684 if (msg->from_to_wire == DNS_MESSAGE_INTENTRENDER) {
2685 msg->sig_reserved = spacefortsig(msg->tsigkey, 0);
2686 result = dns_message_renderreserve(msg,
2688 if (result != ISC_R_SUCCESS) {
2689 dns_tsigkey_detach(&msg->tsigkey);
2690 msg->sig_reserved = 0;
2695 return (ISC_R_SUCCESS);
2699 dns_message_gettsigkey(dns_message_t *msg) {
2702 * Get the TSIG key for 'msg'
2705 REQUIRE(DNS_MESSAGE_VALID(msg));
2707 return (msg->tsigkey);
2711 dns_message_setquerytsig(dns_message_t *msg, isc_buffer_t *querytsig) {
2712 dns_rdata_t *rdata = NULL;
2713 dns_rdatalist_t *list = NULL;
2714 dns_rdataset_t *set = NULL;
2715 isc_buffer_t *buf = NULL;
2717 isc_result_t result;
2719 REQUIRE(DNS_MESSAGE_VALID(msg));
2720 REQUIRE(msg->querytsig == NULL);
2722 if (querytsig == NULL)
2723 return (ISC_R_SUCCESS);
2725 result = dns_message_gettemprdata(msg, &rdata);
2726 if (result != ISC_R_SUCCESS)
2729 result = dns_message_gettemprdatalist(msg, &list);
2730 if (result != ISC_R_SUCCESS)
2732 result = dns_message_gettemprdataset(msg, &set);
2733 if (result != ISC_R_SUCCESS)
2736 isc_buffer_usedregion(querytsig, &r);
2737 result = isc_buffer_allocate(msg->mctx, &buf, r.length);
2738 if (result != ISC_R_SUCCESS)
2740 isc_buffer_putmem(buf, r.base, r.length);
2741 isc_buffer_usedregion(buf, &r);
2742 dns_rdata_init(rdata);
2743 dns_rdata_fromregion(rdata, dns_rdataclass_any, dns_rdatatype_tsig, &r);
2744 dns_message_takebuffer(msg, &buf);
2745 ISC_LIST_INIT(list->rdata);
2746 ISC_LIST_APPEND(list->rdata, rdata, link);
2747 result = dns_rdatalist_tordataset(list, set);
2748 if (result != ISC_R_SUCCESS)
2751 msg->querytsig = set;
2757 dns_message_puttemprdata(msg, &rdata);
2759 dns_message_puttemprdatalist(msg, &list);
2761 dns_message_puttemprdataset(msg, &set);
2762 return (ISC_R_NOMEMORY);
2766 dns_message_getquerytsig(dns_message_t *msg, isc_mem_t *mctx,
2767 isc_buffer_t **querytsig) {
2768 isc_result_t result;
2769 dns_rdata_t rdata = DNS_RDATA_INIT;
2772 REQUIRE(DNS_MESSAGE_VALID(msg));
2773 REQUIRE(mctx != NULL);
2774 REQUIRE(querytsig != NULL && *querytsig == NULL);
2776 if (msg->tsig == NULL)
2777 return (ISC_R_SUCCESS);
2779 result = dns_rdataset_first(msg->tsig);
2780 if (result != ISC_R_SUCCESS)
2782 dns_rdataset_current(msg->tsig, &rdata);
2783 dns_rdata_toregion(&rdata, &r);
2785 result = isc_buffer_allocate(mctx, querytsig, r.length);
2786 if (result != ISC_R_SUCCESS)
2788 isc_buffer_putmem(*querytsig, r.base, r.length);
2789 return (ISC_R_SUCCESS);
2793 dns_message_getsig0(dns_message_t *msg, dns_name_t **owner) {
2796 * Get the SIG(0) record for 'msg'.
2799 REQUIRE(DNS_MESSAGE_VALID(msg));
2800 REQUIRE(owner == NULL || *owner == NULL);
2802 if (msg->sig0 != NULL && owner != NULL) {
2803 /* If dns_message_getsig0 is called on a rendered message
2804 * after the SIG(0) has been applied, we need to return the
2805 * root name, not NULL.
2807 if (msg->sig0name == NULL)
2808 *owner = dns_rootname;
2810 *owner = msg->sig0name;
2816 dns_message_setsig0key(dns_message_t *msg, dst_key_t *key) {
2819 isc_result_t result;
2822 * Set the SIG(0) key for 'msg'
2826 * The space required for an SIG(0) record is:
2828 * 1 byte for the name
2829 * 2 bytes for the type
2830 * 2 bytes for the class
2831 * 4 bytes for the ttl
2832 * 2 bytes for the type covered
2833 * 1 byte for the algorithm
2834 * 1 bytes for the labels
2835 * 4 bytes for the original ttl
2836 * 4 bytes for the signature expiration
2837 * 4 bytes for the signature inception
2838 * 2 bytes for the key tag
2839 * n bytes for the signer's name
2840 * x bytes for the signature
2841 * ---------------------------------
2844 REQUIRE(DNS_MESSAGE_VALID(msg));
2845 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
2846 REQUIRE(msg->state == DNS_SECTION_ANY);
2849 REQUIRE(msg->sig0key == NULL && msg->tsigkey == NULL);
2850 dns_name_toregion(dst_key_name(key), &r);
2851 result = dst_key_sigsize(key, &x);
2852 if (result != ISC_R_SUCCESS) {
2853 msg->sig_reserved = 0;
2856 msg->sig_reserved = 27 + r.length + x;
2857 result = dns_message_renderreserve(msg, msg->sig_reserved);
2858 if (result != ISC_R_SUCCESS) {
2859 msg->sig_reserved = 0;
2864 return (ISC_R_SUCCESS);
2868 dns_message_getsig0key(dns_message_t *msg) {
2871 * Get the SIG(0) key for 'msg'
2874 REQUIRE(DNS_MESSAGE_VALID(msg));
2876 return (msg->sig0key);
2880 dns_message_takebuffer(dns_message_t *msg, isc_buffer_t **buffer) {
2881 REQUIRE(DNS_MESSAGE_VALID(msg));
2882 REQUIRE(buffer != NULL);
2883 REQUIRE(ISC_BUFFER_VALID(*buffer));
2885 ISC_LIST_APPEND(msg->cleanup, *buffer, link);
2890 dns_message_signer(dns_message_t *msg, dns_name_t *signer) {
2891 isc_result_t result = ISC_R_SUCCESS;
2892 dns_rdata_t rdata = DNS_RDATA_INIT;
2894 REQUIRE(DNS_MESSAGE_VALID(msg));
2895 REQUIRE(signer != NULL);
2896 REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE);
2898 if (msg->tsig == NULL && msg->sig0 == NULL)
2899 return (ISC_R_NOTFOUND);
2901 if (msg->verify_attempted == 0)
2902 return (DNS_R_NOTVERIFIEDYET);
2904 if (!dns_name_hasbuffer(signer)) {
2905 isc_buffer_t *dynbuf = NULL;
2906 result = isc_buffer_allocate(msg->mctx, &dynbuf, 512);
2907 if (result != ISC_R_SUCCESS)
2909 dns_name_setbuffer(signer, dynbuf);
2910 dns_message_takebuffer(msg, &dynbuf);
2913 if (msg->sig0 != NULL) {
2914 dns_rdata_sig_t sig;
2916 result = dns_rdataset_first(msg->sig0);
2917 INSIST(result == ISC_R_SUCCESS);
2918 dns_rdataset_current(msg->sig0, &rdata);
2920 result = dns_rdata_tostruct(&rdata, &sig, NULL);
2921 if (result != ISC_R_SUCCESS)
2924 if (msg->verified_sig && msg->sig0status == dns_rcode_noerror)
2925 result = ISC_R_SUCCESS;
2927 result = DNS_R_SIGINVALID;
2928 dns_name_clone(&sig.signer, signer);
2929 dns_rdata_freestruct(&sig);
2931 dns_name_t *identity;
2932 dns_rdata_any_tsig_t tsig;
2934 result = dns_rdataset_first(msg->tsig);
2935 INSIST(result == ISC_R_SUCCESS);
2936 dns_rdataset_current(msg->tsig, &rdata);
2938 result = dns_rdata_tostruct(&rdata, &tsig, NULL);
2939 INSIST(result == ISC_R_SUCCESS);
2940 if (msg->tsigstatus != dns_rcode_noerror)
2941 result = DNS_R_TSIGVERIFYFAILURE;
2942 else if (tsig.error != dns_rcode_noerror)
2943 result = DNS_R_TSIGERRORSET;
2945 result = ISC_R_SUCCESS;
2946 dns_rdata_freestruct(&tsig);
2948 if (msg->tsigkey == NULL) {
2950 * If msg->tsigstatus & tsig.error are both
2951 * dns_rcode_noerror, the message must have been
2952 * verified, which means msg->tsigkey will be
2955 INSIST(result != ISC_R_SUCCESS);
2957 identity = dns_tsigkey_identity(msg->tsigkey);
2958 if (identity == NULL) {
2959 if (result == ISC_R_SUCCESS)
2960 result = DNS_R_NOIDENTITY;
2961 identity = &msg->tsigkey->name;
2963 dns_name_clone(identity, signer);
2971 dns_message_resetsig(dns_message_t *msg) {
2972 REQUIRE(DNS_MESSAGE_VALID(msg));
2973 msg->verified_sig = 0;
2974 msg->verify_attempted = 0;
2975 msg->tsigstatus = dns_rcode_noerror;
2976 msg->sig0status = dns_rcode_noerror;
2977 msg->timeadjust = 0;
2978 if (msg->tsigkey != NULL) {
2979 dns_tsigkey_detach(&msg->tsigkey);
2980 msg->tsigkey = NULL;
2985 dns_message_rechecksig(dns_message_t *msg, dns_view_t *view) {
2986 dns_message_resetsig(msg);
2987 return (dns_message_checksig(msg, view));
2990 #ifdef SKAN_MSG_DEBUG
2992 dns_message_dumpsig(dns_message_t *msg, char *txt1) {
2993 dns_rdata_t querytsigrdata = DNS_RDATA_INIT;
2994 dns_rdata_any_tsig_t querytsig;
2995 isc_result_t result;
2997 if (msg->tsig != NULL) {
2998 result = dns_rdataset_first(msg->tsig);
2999 RUNTIME_CHECK(result == ISC_R_SUCCESS);
3000 dns_rdataset_current(msg->tsig, &querytsigrdata);
3001 result = dns_rdata_tostruct(&querytsigrdata, &querytsig, NULL);
3002 RUNTIME_CHECK(result == ISC_R_SUCCESS);
3003 hexdump(txt1, "TSIG", querytsig.signature,
3007 if (msg->querytsig != NULL) {
3008 result = dns_rdataset_first(msg->querytsig);
3009 RUNTIME_CHECK(result == ISC_R_SUCCESS);
3010 dns_rdataset_current(msg->querytsig, &querytsigrdata);
3011 result = dns_rdata_tostruct(&querytsigrdata, &querytsig, NULL);
3012 RUNTIME_CHECK(result == ISC_R_SUCCESS);
3013 hexdump(txt1, "QUERYTSIG", querytsig.signature,
3020 dns_message_checksig(dns_message_t *msg, dns_view_t *view) {
3021 isc_buffer_t b, msgb;
3023 REQUIRE(DNS_MESSAGE_VALID(msg));
3025 if (msg->tsigkey == NULL && msg->tsig == NULL && msg->sig0 == NULL)
3026 return (ISC_R_SUCCESS);
3028 INSIST(msg->saved.base != NULL);
3029 isc_buffer_init(&msgb, msg->saved.base, msg->saved.length);
3030 isc_buffer_add(&msgb, msg->saved.length);
3031 if (msg->tsigkey != NULL || msg->tsig != NULL) {
3032 #ifdef SKAN_MSG_DEBUG
3033 dns_message_dumpsig(msg, "dns_message_checksig#1");
3036 return (dns_view_checksig(view, &msgb, msg));
3038 return (dns_tsig_verify(&msgb, msg, NULL, NULL));
3040 dns_rdata_t rdata = DNS_RDATA_INIT;
3041 dns_rdata_sig_t sig;
3042 dns_rdataset_t keyset;
3043 isc_result_t result;
3045 result = dns_rdataset_first(msg->sig0);
3046 INSIST(result == ISC_R_SUCCESS);
3047 dns_rdataset_current(msg->sig0, &rdata);
3050 * This can occur when the message is a dynamic update, since
3051 * the rdata length checking is relaxed. This should not
3052 * happen in a well-formed message, since the SIG(0) is only
3053 * looked for in the additional section, and the dynamic update
3054 * meta-records are in the prerequisite and update sections.
3056 if (rdata.length == 0)
3057 return (ISC_R_UNEXPECTEDEND);
3059 result = dns_rdata_tostruct(&rdata, &sig, msg->mctx);
3060 if (result != ISC_R_SUCCESS)
3063 dns_rdataset_init(&keyset);
3065 return (DNS_R_KEYUNAUTHORIZED);
3066 result = dns_view_simplefind(view, &sig.signer,
3067 dns_rdatatype_key /* SIG(0) */,
3068 0, 0, ISC_FALSE, &keyset, NULL);
3070 if (result != ISC_R_SUCCESS) {
3071 /* XXXBEW Should possibly create a fetch here */
3072 result = DNS_R_KEYUNAUTHORIZED;
3074 } else if (keyset.trust < dns_trust_secure) {
3075 /* XXXBEW Should call a validator here */
3076 result = DNS_R_KEYUNAUTHORIZED;
3079 result = dns_rdataset_first(&keyset);
3080 INSIST(result == ISC_R_SUCCESS);
3082 result == ISC_R_SUCCESS;
3083 result = dns_rdataset_next(&keyset))
3085 dst_key_t *key = NULL;
3087 dns_rdata_reset(&rdata);
3088 dns_rdataset_current(&keyset, &rdata);
3089 isc_buffer_init(&b, rdata.data, rdata.length);
3090 isc_buffer_add(&b, rdata.length);
3092 result = dst_key_fromdns(&sig.signer, rdata.rdclass,
3093 &b, view->mctx, &key);
3094 if (result != ISC_R_SUCCESS)
3096 if (dst_key_alg(key) != sig.algorithm ||
3097 dst_key_id(key) != sig.keyid ||
3098 !(dst_key_proto(key) == DNS_KEYPROTO_DNSSEC ||
3099 dst_key_proto(key) == DNS_KEYPROTO_ANY))
3104 result = dns_dnssec_verifymessage(&msgb, msg, key);
3106 if (result == ISC_R_SUCCESS)
3109 if (result == ISC_R_NOMORE)
3110 result = DNS_R_KEYUNAUTHORIZED;
3113 if (dns_rdataset_isassociated(&keyset))
3114 dns_rdataset_disassociate(&keyset);
3115 dns_rdata_freestruct(&sig);
3121 dns_message_sectiontotext(dns_message_t *msg, dns_section_t section,
3122 const dns_master_style_t *style,
3123 dns_messagetextflag_t flags,
3124 isc_buffer_t *target) {
3125 dns_name_t *name, empty_name;
3126 dns_rdataset_t *rdataset;
3127 isc_result_t result;
3128 isc_boolean_t seensoa = ISC_FALSE;
3130 REQUIRE(DNS_MESSAGE_VALID(msg));
3131 REQUIRE(target != NULL);
3132 REQUIRE(VALID_SECTION(section));
3134 if (ISC_LIST_EMPTY(msg->sections[section]))
3135 return (ISC_R_SUCCESS);
3137 if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0) {
3138 ADD_STRING(target, ";; ");
3139 if (msg->opcode != dns_opcode_update) {
3140 ADD_STRING(target, sectiontext[section]);
3142 ADD_STRING(target, updsectiontext[section]);
3144 ADD_STRING(target, " SECTION:\n");
3147 dns_name_init(&empty_name, NULL);
3148 result = dns_message_firstname(msg, section);
3149 if (result != ISC_R_SUCCESS) {
3154 dns_message_currentname(msg, section, &name);
3155 for (rdataset = ISC_LIST_HEAD(name->list);
3157 rdataset = ISC_LIST_NEXT(rdataset, link)) {
3158 if (section == DNS_SECTION_ANSWER &&
3159 rdataset->type == dns_rdatatype_soa) {
3160 if ((flags & DNS_MESSAGETEXTFLAG_OMITSOA) != 0)
3163 (flags & DNS_MESSAGETEXTFLAG_ONESOA) != 0)
3167 if (section == DNS_SECTION_QUESTION) {
3168 ADD_STRING(target, ";");
3169 result = dns_master_questiontotext(name,
3174 result = dns_master_rdatasettotext(name,
3179 if (result != ISC_R_SUCCESS)
3182 result = dns_message_nextname(msg, section);
3183 } while (result == ISC_R_SUCCESS);
3184 if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
3185 (flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3186 ADD_STRING(target, "\n");
3187 if (result == ISC_R_NOMORE)
3188 result = ISC_R_SUCCESS;
3193 dns_message_pseudosectiontotext(dns_message_t *msg,
3194 dns_pseudosection_t section,
3195 const dns_master_style_t *style,
3196 dns_messagetextflag_t flags,
3197 isc_buffer_t *target) {
3198 dns_rdataset_t *ps = NULL;
3199 dns_name_t *name = NULL;
3200 isc_result_t result;
3201 char buf[sizeof("1234567890")];
3204 isc_buffer_t optbuf;
3205 isc_uint16_t optcode, optlen;
3206 unsigned char *optdata;
3208 REQUIRE(DNS_MESSAGE_VALID(msg));
3209 REQUIRE(target != NULL);
3210 REQUIRE(VALID_PSEUDOSECTION(section));
3213 case DNS_PSEUDOSECTION_OPT:
3214 ps = dns_message_getopt(msg);
3216 return (ISC_R_SUCCESS);
3217 if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3218 ADD_STRING(target, ";; OPT PSEUDOSECTION:\n");
3219 ADD_STRING(target, "; EDNS: version: ");
3220 snprintf(buf, sizeof(buf), "%u",
3221 (unsigned int)((ps->ttl & 0x00ff0000) >> 16));
3222 ADD_STRING(target, buf);
3223 ADD_STRING(target, ", flags:");
3224 if ((ps->ttl & DNS_MESSAGEEXTFLAG_DO) != 0)
3225 ADD_STRING(target, " do");
3226 mbz = ps->ttl & 0xffff;
3227 mbz &= ~DNS_MESSAGEEXTFLAG_DO; /* Known Flags. */
3229 ADD_STRING(target, "; MBZ: ");
3230 snprintf(buf, sizeof(buf), "%.4x ", mbz);
3231 ADD_STRING(target, buf);
3232 ADD_STRING(target, ", udp: ");
3234 ADD_STRING(target, "; udp: ");
3235 snprintf(buf, sizeof(buf), "%u\n", (unsigned int)ps->rdclass);
3236 ADD_STRING(target, buf);
3238 result = dns_rdataset_first(ps);
3239 if (result != ISC_R_SUCCESS)
3240 return (ISC_R_SUCCESS);
3242 /* Print EDNS info, if any */
3243 dns_rdata_init(&rdata);
3244 dns_rdataset_current(ps, &rdata);
3246 isc_buffer_init(&optbuf, rdata.data, rdata.length);
3247 isc_buffer_add(&optbuf, rdata.length);
3248 while (isc_buffer_remaininglength(&optbuf) != 0) {
3249 INSIST(isc_buffer_remaininglength(&optbuf) >= 4U);
3250 optcode = isc_buffer_getuint16(&optbuf);
3251 optlen = isc_buffer_getuint16(&optbuf);
3252 INSIST(isc_buffer_remaininglength(&optbuf) >= optlen);
3254 if (optcode == DNS_OPT_NSID) {
3255 ADD_STRING(target, "; NSID");
3257 ADD_STRING(target, "; OPT=");
3258 sprintf(buf, "%u", optcode);
3259 ADD_STRING(target, buf);
3264 ADD_STRING(target, ": ");
3266 optdata = isc_buffer_current(&optbuf);
3267 for (i = 0; i < optlen; i++) {
3268 sprintf(buf, "%02x ", optdata[i]);
3269 ADD_STRING(target, buf);
3271 for (i = 0; i < optlen; i++) {
3272 ADD_STRING(target, " (");
3273 if (isprint(optdata[i]))
3274 isc_buffer_putmem(target,
3278 isc_buffer_putstr(target, ".");
3279 ADD_STRING(target, ")");
3281 isc_buffer_forward(&optbuf, optlen);
3283 ADD_STRING(target, "\n");
3285 return (ISC_R_SUCCESS);
3286 case DNS_PSEUDOSECTION_TSIG:
3287 ps = dns_message_gettsig(msg, &name);
3289 return (ISC_R_SUCCESS);
3290 if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3291 ADD_STRING(target, ";; TSIG PSEUDOSECTION:\n");
3292 result = dns_master_rdatasettotext(name, ps, style, target);
3293 if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
3294 (flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3295 ADD_STRING(target, "\n");
3297 case DNS_PSEUDOSECTION_SIG0:
3298 ps = dns_message_getsig0(msg, &name);
3300 return (ISC_R_SUCCESS);
3301 if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3302 ADD_STRING(target, ";; SIG0 PSEUDOSECTION:\n");
3303 result = dns_master_rdatasettotext(name, ps, style, target);
3304 if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
3305 (flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
3306 ADD_STRING(target, "\n");
3309 return (ISC_R_UNEXPECTED);
3313 dns_message_totext(dns_message_t *msg, const dns_master_style_t *style,
3314 dns_messagetextflag_t flags, isc_buffer_t *target) {
3315 char buf[sizeof("1234567890")];
3316 isc_result_t result;
3318 REQUIRE(DNS_MESSAGE_VALID(msg));
3319 REQUIRE(target != NULL);
3321 if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0) {
3322 ADD_STRING(target, ";; ->>HEADER<<- opcode: ");
3323 ADD_STRING(target, opcodetext[msg->opcode]);
3324 ADD_STRING(target, ", status: ");
3325 if (msg->rcode < (sizeof(rcodetext)/sizeof(rcodetext[0]))) {
3326 ADD_STRING(target, rcodetext[msg->rcode]);
3328 snprintf(buf, sizeof(buf), "%4u", msg->rcode);
3329 ADD_STRING(target, buf);
3331 ADD_STRING(target, ", id: ");
3332 snprintf(buf, sizeof(buf), "%6u", msg->id);
3333 ADD_STRING(target, buf);
3334 ADD_STRING(target, "\n;; flags:");
3335 if ((msg->flags & DNS_MESSAGEFLAG_QR) != 0)
3336 ADD_STRING(target, " qr");
3337 if ((msg->flags & DNS_MESSAGEFLAG_AA) != 0)
3338 ADD_STRING(target, " aa");
3339 if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0)
3340 ADD_STRING(target, " tc");
3341 if ((msg->flags & DNS_MESSAGEFLAG_RD) != 0)
3342 ADD_STRING(target, " rd");
3343 if ((msg->flags & DNS_MESSAGEFLAG_RA) != 0)
3344 ADD_STRING(target, " ra");
3345 if ((msg->flags & DNS_MESSAGEFLAG_AD) != 0)
3346 ADD_STRING(target, " ad");
3347 if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0)
3348 ADD_STRING(target, " cd");
3350 * The final unnamed flag must be zero.
3352 if ((msg->flags & 0x0040U) != 0)
3353 ADD_STRING(target, "; MBZ: 0x4");
3354 if (msg->opcode != dns_opcode_update) {
3355 ADD_STRING(target, "; QUESTION: ");
3357 ADD_STRING(target, "; ZONE: ");
3359 snprintf(buf, sizeof(buf), "%1u",
3360 msg->counts[DNS_SECTION_QUESTION]);
3361 ADD_STRING(target, buf);
3362 if (msg->opcode != dns_opcode_update) {
3363 ADD_STRING(target, ", ANSWER: ");
3365 ADD_STRING(target, ", PREREQ: ");
3367 snprintf(buf, sizeof(buf), "%1u",
3368 msg->counts[DNS_SECTION_ANSWER]);
3369 ADD_STRING(target, buf);
3370 if (msg->opcode != dns_opcode_update) {
3371 ADD_STRING(target, ", AUTHORITY: ");
3373 ADD_STRING(target, ", UPDATE: ");
3375 snprintf(buf, sizeof(buf), "%1u",
3376 msg->counts[DNS_SECTION_AUTHORITY]);
3377 ADD_STRING(target, buf);
3378 ADD_STRING(target, ", ADDITIONAL: ");
3379 snprintf(buf, sizeof(buf), "%1u",
3380 msg->counts[DNS_SECTION_ADDITIONAL]);
3381 ADD_STRING(target, buf);
3382 ADD_STRING(target, "\n");
3384 result = dns_message_pseudosectiontotext(msg,
3385 DNS_PSEUDOSECTION_OPT,
3386 style, flags, target);
3387 if (result != ISC_R_SUCCESS)
3390 result = dns_message_sectiontotext(msg, DNS_SECTION_QUESTION,
3391 style, flags, target);
3392 if (result != ISC_R_SUCCESS)
3394 result = dns_message_sectiontotext(msg, DNS_SECTION_ANSWER,
3395 style, flags, target);
3396 if (result != ISC_R_SUCCESS)
3398 result = dns_message_sectiontotext(msg, DNS_SECTION_AUTHORITY,
3399 style, flags, target);
3400 if (result != ISC_R_SUCCESS)
3402 result = dns_message_sectiontotext(msg, DNS_SECTION_ADDITIONAL,
3403 style, flags, target);
3404 if (result != ISC_R_SUCCESS)
3407 result = dns_message_pseudosectiontotext(msg,
3408 DNS_PSEUDOSECTION_TSIG,
3409 style, flags, target);
3410 if (result != ISC_R_SUCCESS)
3413 result = dns_message_pseudosectiontotext(msg,
3414 DNS_PSEUDOSECTION_SIG0,
3415 style, flags, target);
3416 if (result != ISC_R_SUCCESS)
3419 return (ISC_R_SUCCESS);
3423 dns_message_getrawmessage(dns_message_t *msg) {
3424 REQUIRE(DNS_MESSAGE_VALID(msg));
3425 return (&msg->saved);
3429 dns_message_setsortorder(dns_message_t *msg, dns_rdatasetorderfunc_t order,
3430 const void *order_arg)
3432 REQUIRE(DNS_MESSAGE_VALID(msg));
3434 msg->order_arg = order_arg;
3438 dns_message_settimeadjust(dns_message_t *msg, int timeadjust) {
3439 REQUIRE(DNS_MESSAGE_VALID(msg));
3440 msg->timeadjust = timeadjust;
3444 dns_message_gettimeadjust(dns_message_t *msg) {
3445 REQUIRE(DNS_MESSAGE_VALID(msg));
3446 return (msg->timeadjust);
3450 dns_opcode_totext(dns_opcode_t opcode, isc_buffer_t *target) {
3452 REQUIRE(opcode < 16);
3454 if (isc_buffer_availablelength(target) < strlen(opcodetext[opcode]))
3455 return (ISC_R_NOSPACE);
3456 isc_buffer_putstr(target, opcodetext[opcode]);
3457 return (ISC_R_SUCCESS);
3461 dns_message_buildopt(dns_message_t *message, dns_rdataset_t **rdatasetp,
3462 unsigned int version, isc_uint16_t udpsize,
3463 unsigned int flags, dns_ednsopt_t *ednsopts, size_t count)
3465 dns_rdataset_t *rdataset = NULL;
3466 dns_rdatalist_t *rdatalist = NULL;
3467 dns_rdata_t *rdata = NULL;
3468 isc_result_t result;
3469 unsigned int len = 0, i;
3471 REQUIRE(DNS_MESSAGE_VALID(message));
3472 REQUIRE(rdatasetp != NULL && *rdatasetp == NULL);
3474 result = dns_message_gettemprdatalist(message, &rdatalist);
3475 if (result != ISC_R_SUCCESS)
3477 result = dns_message_gettemprdata(message, &rdata);
3478 if (result != ISC_R_SUCCESS)
3480 result = dns_message_gettemprdataset(message, &rdataset);
3481 if (result != ISC_R_SUCCESS)
3483 dns_rdataset_init(rdataset);
3485 rdatalist->type = dns_rdatatype_opt;
3486 rdatalist->covers = 0;
3489 * Set Maximum UDP buffer size.
3491 rdatalist->rdclass = udpsize;
3494 * Set EXTENDED-RCODE and Z to 0.
3496 rdatalist->ttl = (version << 16);
3497 rdatalist->ttl |= (flags & 0xffff);
3500 * Set EDNS options if applicable
3503 isc_buffer_t *buf = NULL;
3504 for (i = 0; i < count; i++)
3505 len += ednsopts[i].length + 4;
3507 if (len > 0xffffU) {
3508 result = ISC_R_NOSPACE;
3512 result = isc_buffer_allocate(message->mctx, &buf, len);
3513 if (result != ISC_R_SUCCESS)
3516 for (i = 0; i < count; i++) {
3517 isc_buffer_putuint16(buf, ednsopts[i].code);
3518 isc_buffer_putuint16(buf, ednsopts[i].length);
3519 isc_buffer_putmem(buf, ednsopts[i].value,
3520 ednsopts[i].length);
3522 rdata->data = isc_buffer_base(buf);
3523 rdata->length = len;
3524 dns_message_takebuffer(message, &buf);
3530 rdata->rdclass = rdatalist->rdclass;
3531 rdata->type = rdatalist->type;
3534 ISC_LIST_INIT(rdatalist->rdata);
3535 ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
3536 result = dns_rdatalist_tordataset(rdatalist, rdataset);
3537 RUNTIME_CHECK(result == ISC_R_SUCCESS);
3539 *rdatasetp = rdataset;
3540 return (ISC_R_SUCCESS);
3544 dns_message_puttemprdata(message, &rdata);
3545 if (rdataset != NULL)
3546 dns_message_puttemprdataset(message, &rdataset);
3547 if (rdatalist != NULL)
3548 dns_message_puttemprdatalist(message, &rdatalist);