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-rw-r--r--ares_parse_soa_reply.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/ares_parse_soa_reply.c b/ares_parse_soa_reply.c
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+
+/* 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_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)
+ 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;
+}
+