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