Multicast DNS implementation (initial)

net/dns/dns_response.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/dns/dns_response.h"
 
 #include "base/strings/string_util.h"
 #include "base/sys_byteorder.h"
 #include "net/base/address_list.h"
 #include "net/base/big_endian.h"
@@ skipping 213 matching lines @@
 uint8 DnsResponse::rcode() const {
   DCHECK(parser_.IsValid());
   return base::NetToHost16(header()->flags) & dns_protocol::kRcodeMask;
 }
 
 unsigned DnsResponse::answer_count() const {
   DCHECK(parser_.IsValid());
   return base::NetToHost16(header()->ancount);
 }
 
+unsigned DnsResponse::additional_answer_count() const {
+  DCHECK(parser_.IsValid());
+  return base::NetToHost16(header()->arcount);
+}
+
 base::StringPiece DnsResponse::qname() const {
   DCHECK(parser_.IsValid());
   // The response is HEADER QNAME QTYPE QCLASS ANSWER.
   // |parser_| is positioned at the beginning of ANSWER, so the end of QNAME is
   // two uint16s before it.
   const size_t hdr_size = sizeof(dns_protocol::Header);
   const size_t qname_size = parser_.GetOffset() - 2 * sizeof(uint16) - hdr_size;
   return base::StringPiece(io_buffer_->data() + hdr_size, qname_size);
 }
 
@@ skipping 79 matching lines @@
 
   // getcanonname in eglibc returns the first owner name of an A or AAAA RR.
   // If the response passed all the checks so far, then |expected_name| is it.
   *addr_list = AddressList::CreateFromIPAddressList(ip_addresses,
                                                     expected_name);
   *ttl = base::TimeDelta::FromSeconds(ttl_sec);
   return DNS_PARSE_OK;
 }
 
 }  // namespace net