134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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* Copyright (C) 2012 Marko Kreen <markokr@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "ares_setup.h"
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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# include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#endif
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#ifdef HAVE_ARPA_NAMESER_H
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# include <arpa/nameser.h>
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#else
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# include "nameser.h"
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#endif
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#ifdef HAVE_ARPA_NAMESER_COMPAT_H
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# include <arpa/nameser_compat.h>
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#endif
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#include "ares.h"
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#include "ares_dns.h"
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#include "ares_data.h"
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#include "ares_private.h"
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int
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ares_parse_soa_reply(const unsigned char *abuf, int alen,
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struct ares_soa_reply **soa_out)
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{
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const unsigned char *aptr;
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long len;
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char *qname = NULL, *rr_name = NULL;
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struct ares_soa_reply *soa = NULL;
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int qdcount, ancount;
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int status;
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if (alen < HFIXEDSZ)
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return ARES_EBADRESP;
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/* parse message header */
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qdcount = DNS_HEADER_QDCOUNT(abuf);
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ancount = DNS_HEADER_ANCOUNT(abuf);
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if (qdcount != 1 || ancount != 1)
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return ARES_EBADRESP;
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aptr = abuf + HFIXEDSZ;
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/* query name */
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status = ares__expand_name_for_response(aptr, abuf, alen, &qname, &len);
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if (status != ARES_SUCCESS)
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goto failed_stat;
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aptr += len;
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/* skip qtype & qclass */
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if (aptr + QFIXEDSZ > abuf + alen)
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goto failed;
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aptr += QFIXEDSZ;
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/* rr_name */
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status = ares__expand_name_for_response(aptr, abuf, alen, &rr_name, &len);
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if (status != ARES_SUCCESS)
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goto failed_stat;
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aptr += len;
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/* skip rr_type, rr_class, rr_ttl, rr_rdlen */
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if (aptr + RRFIXEDSZ > abuf + alen)
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goto failed;
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aptr += RRFIXEDSZ;
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/* allocate result struct */
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soa = ares_malloc_data(ARES_DATATYPE_SOA_REPLY);
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if (!soa)
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{
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status = ARES_ENOMEM;
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goto failed_stat;
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}
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/* nsname */
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status = ares__expand_name_for_response(aptr, abuf, alen, &soa->nsname, &len);
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if (status != ARES_SUCCESS)
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goto failed_stat;
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aptr += len;
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/* hostmaster */
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status = ares__expand_name_for_response(aptr, abuf, alen, &soa->hostmaster, &len);
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if (status != ARES_SUCCESS)
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goto failed_stat;
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aptr += len;
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/* integer fields */
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if (aptr + 5 * 4 > abuf + alen)
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goto failed;
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soa->serial = DNS__32BIT(aptr + 0 * 4);
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soa->refresh = DNS__32BIT(aptr + 1 * 4);
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soa->retry = DNS__32BIT(aptr + 2 * 4);
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soa->expire = DNS__32BIT(aptr + 3 * 4);
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soa->minttl = DNS__32BIT(aptr + 4 * 4);
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ares_free(qname);
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ares_free(rr_name);
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*soa_out = soa;
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return ARES_SUCCESS;
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failed:
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status = ARES_EBADRESP;
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failed_stat:
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ares_free_data(soa);
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if (qname)
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ares_free(qname);
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if (rr_name)
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ares_free(rr_name);
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return status;
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}
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