mirror of https://github.com/getdnsapi/getdns.git
116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/**
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*
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* /brief RR iterator over wireformat DNS packet
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*/
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/*
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* Copyright (c) 2013, NLnet Labs, Verisign, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of the copyright holders nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Verisign, Inc. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef RR_ITER_H_
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#define RR_ITER_H_
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#include "getdns/getdns.h"
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#include "rr-dict.h"
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#include "gldns/pkthdr.h"
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#include "gldns/gbuffer.h"
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typedef struct _getdns_rr_iter {
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const uint8_t *pkt;
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const uint8_t *pkt_end;
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/* Which RR are we currently at */
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size_t n;
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/* pos points to start of the owner name the RR.
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* Or is NULL when there are no RR's left.
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*/
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const uint8_t *pos;
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/* rr_type will point to the rr_type right after the RR's owner name.
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* rr_type is guaranteed to have a value when pos has a value
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*/
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const uint8_t *rr_type;
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/* nxt point to the owner name of the next RR or to pkt_end */
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const uint8_t *nxt;
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} _getdns_rr_iter;
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_getdns_rr_iter *_getdns_rr_iter_init(_getdns_rr_iter *i,
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const uint8_t *pkt, const size_t pkt_len);
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_getdns_rr_iter *_getdns_single_rr_iter_init(_getdns_rr_iter *i,
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const uint8_t *wire, const size_t wire_len);
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_getdns_rr_iter *_getdns_rr_iter_rewind(_getdns_rr_iter *i);
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_getdns_rr_iter *_getdns_rr_iter_next(_getdns_rr_iter *i);
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const uint8_t *_getdns_owner_if_or_as_decompressed(
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_getdns_rr_iter *i, uint8_t *ff_bytes, size_t *len);
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static inline gldns_pkt_section
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_getdns_rr_iter_section(_getdns_rr_iter *i)
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{
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return !i->pkt ? (i->nxt - i->rr_type == 4 ? GLDNS_SECTION_QUESTION
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: GLDNS_SECTION_ANSWER )
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: i->n < GLDNS_QDCOUNT(i->pkt) ? GLDNS_SECTION_QUESTION
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: i->n < GLDNS_QDCOUNT(i->pkt)
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+ GLDNS_ANCOUNT(i->pkt) ? GLDNS_SECTION_ANSWER
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: i->n < GLDNS_QDCOUNT(i->pkt)
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+ GLDNS_ANCOUNT(i->pkt)
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+ GLDNS_NSCOUNT(i->pkt) ? GLDNS_SECTION_AUTHORITY
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: i->n < GLDNS_QDCOUNT(i->pkt)
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+ GLDNS_ANCOUNT(i->pkt)
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+ GLDNS_NSCOUNT(i->pkt)
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+ GLDNS_ARCOUNT(i->pkt) ? GLDNS_SECTION_ADDITIONAL
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: GLDNS_SECTION_ANY;
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}
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typedef struct piv_getdns_rdf_iter {
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const uint8_t *pkt;
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const uint8_t *pkt_end;
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const _getdns_rdata_def *rdd_pos;
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const _getdns_rdata_def *rdd_end;
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const _getdns_rdata_def *rdd_repeat;
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const uint8_t *pos;
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const uint8_t *end;
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const uint8_t *nxt;
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} _getdns_rdf_iter;
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_getdns_rdf_iter *_getdns_rdf_iter_init(_getdns_rdf_iter *i,
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_getdns_rr_iter *rr);
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_getdns_rdf_iter *_getdns_rdf_iter_next(_getdns_rdf_iter *i);
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_getdns_rdf_iter *_getdns_rdf_iter_init_at(_getdns_rdf_iter *i,
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_getdns_rr_iter *rr, size_t pos);
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const uint8_t *_getdns_rdf_if_or_as_decompressed(
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_getdns_rdf_iter *i, uint8_t *ff_bytes, size_t *len);
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#endif
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