| |
| /* Copyright 1998 by the Massachusetts Institute of Technology. |
| * Copyright (C) 2012 Marko Kreen <markokr@gmail.com> |
| * |
| * 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_SYS_SOCKET_H |
| # include <sys/socket.h> |
| #endif |
| #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 <stdlib.h> |
| #include <string.h> |
| #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) |
| return ARES_ENOMEM; |
| |
| /* 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); |
| |
| free(qname); |
| free(rr_name); |
| |
| *soa_out = soa; |
| |
| return ARES_SUCCESS; |
| |
| failed: |
| status = ARES_EBADRESP; |
| |
| failed_stat: |
| ares_free_data(soa); |
| if (qname) |
| free(qname); |
| if (rr_name) |
| free(rr_name); |
| return status; |
| } |
| |