intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 185 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/ares_parse_soa_reply.c b/contrib/libs/c-ares/ares_parse_soa_reply.c
new file mode 100644
index 0000000000..8b84a368db
--- /dev/null
+++ b/contrib/libs/c-ares/ares_parse_soa_reply.c
@@ -0,0 +1,185 @@
+
+/* 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, qclass;
+  int status, i, rr_type, rr_class, rr_len;
+  int ttl;
+
+  if (alen < HFIXEDSZ)
+    return ARES_EBADRESP;
+
+  /* parse message header */
+  qdcount = DNS_HEADER_QDCOUNT(abuf);
+  ancount = DNS_HEADER_ANCOUNT(abuf);
+
+  if (qdcount != 1)
+    return ARES_EBADRESP;
+  if (ancount == 0)
+    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;
+
+  qclass = DNS_QUESTION_TYPE(aptr);
+
+  /* skip qtype & qclass */
+  if (aptr + QFIXEDSZ > abuf + alen)
+    goto failed;
+  aptr += QFIXEDSZ;
+
+  /* qclass of SOA with multiple answers */
+  if (qclass == T_SOA && ancount > 1)
+    goto failed;
+
+  /* examine all the records, break and return if found soa */
+  for (i = 0; i < ancount; i++)
+  {
+    rr_name = NULL;
+    status  = ares__expand_name_for_response (aptr, abuf, alen, &rr_name, &len);
+    if (status != ARES_SUCCESS)
+     {
+      ares_free(rr_name);
+      goto failed_stat;
+     }
+
+    aptr += len;
+    if ( aptr + RRFIXEDSZ > abuf + alen )
+    {
+      ares_free(rr_name);
+      status = ARES_EBADRESP;
+      goto failed_stat;
+    }
+    rr_type = DNS_RR_TYPE( aptr );
+    rr_class = DNS_RR_CLASS( aptr );
+    rr_len = DNS_RR_LEN( aptr );
+    ttl = DNS_RR_TTL(aptr);
+    aptr += RRFIXEDSZ;
+    if (aptr + rr_len > abuf + alen)
+      {
+        ares_free(rr_name);
+        status = ARES_EBADRESP;
+        goto failed_stat;
+      }
+    if ( rr_class == C_IN && rr_type == T_SOA )
+    {
+      /* allocate result struct */
+      soa = ares_malloc_data(ARES_DATATYPE_SOA_REPLY);
+      if (!soa)
+        {
+          ares_free(rr_name);
+          status = ARES_ENOMEM;
+          goto failed_stat;
+        }
+
+      /* nsname */
+      status = ares__expand_name_for_response(aptr, abuf, alen, &soa->nsname,
+                                               &len);
+      if (status != ARES_SUCCESS)
+       {
+        ares_free(rr_name);
+        goto failed_stat;
+       }
+      aptr += len;
+
+      /* hostmaster */
+      status = ares__expand_name_for_response(aptr, abuf, alen,
+                                               &soa->hostmaster, &len);
+      if (status != ARES_SUCCESS)
+       {
+        ares_free(rr_name);
+        goto failed_stat;
+       }
+      aptr += len;
+
+      /* integer fields */
+      if (aptr + 5 * 4 > abuf + alen)
+       {
+        ares_free(rr_name);
+        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);
+      soa->ttl = ttl;
+
+      ares_free(qname);
+      ares_free(rr_name);
+
+      *soa_out = soa;
+
+      return ARES_SUCCESS;
+    }
+    aptr += rr_len;
+    
+    ares_free(rr_name);
+    
+    if (aptr > abuf + alen)
+      goto failed_stat;
+  }
+  /* no SOA record found */
+  status = ARES_EBADRESP;
+  goto failed_stat;
+failed:
+  status = ARES_EBADRESP;
+
+failed_stat:
+  if (soa)
+    ares_free_data(soa);
+  if (qname)
+    ares_free(qname);
+  return status;
+}