97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
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/* $OpenBSD: unpack_dns.h,v 1.1 2018/01/06 07:57:53 sunil Exp $ */
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/*
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* Copyright (c) 2011-2014 Eric Faurot <eric@faurot.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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struct unpack {
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const char *buf;
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size_t len;
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size_t offset;
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const char *err;
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};
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struct dns_header {
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uint16_t id;
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uint16_t flags;
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uint16_t qdcount;
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uint16_t ancount;
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uint16_t nscount;
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uint16_t arcount;
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};
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struct dns_query {
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char q_dname[MAXDNAME];
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uint16_t q_type;
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uint16_t q_class;
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};
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struct dns_rr {
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char rr_dname[MAXDNAME];
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uint16_t rr_type;
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uint16_t rr_class;
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uint32_t rr_ttl;
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union {
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struct {
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char cname[MAXDNAME];
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} cname;
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struct {
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uint16_t preference;
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char exchange[MAXDNAME];
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} mx;
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struct {
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char nsname[MAXDNAME];
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} ns;
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struct {
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char ptrname[MAXDNAME];
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} ptr;
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struct {
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char mname[MAXDNAME];
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char rname[MAXDNAME];
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uint32_t serial;
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uint32_t refresh;
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uint32_t retry;
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uint32_t expire;
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uint32_t minimum;
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} soa;
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struct {
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struct in_addr addr;
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} in_a;
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struct {
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struct in6_addr addr6;
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} in_aaaa;
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struct {
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uint16_t rdlen;
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const void *rdata;
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} other;
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} rr;
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};
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void unpack_init(struct unpack *, const char *, size_t);
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int unpack_header(struct unpack *, struct dns_header *);
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int unpack_rr(struct unpack *, struct dns_rr *);
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int unpack_query(struct unpack *, struct dns_query *);
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char *print_dname(const char *, char *, size_t);
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ssize_t dname_expand(const unsigned char *, size_t, size_t, size_t *,
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char *, size_t);
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