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130 lines
3.2 KiB
130 lines
3.2 KiB
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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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return ARES_ENOMEM; |
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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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free(qname); |
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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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free(qname); |
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if (rr_name) |
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free(rr_name); |
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return status; |
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} |
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