DnsClient refactoring + features (timeout, suffix search, server rotation).

net/dns/dns_protocol.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef NET_DNS_DNS_PROTOCOL_H_
 #define NET_DNS_DNS_PROTOCOL_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "net/base/net_export.h"
 
@@ skipping 56 matching lines @@
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 
 #pragma pack(push)
 #pragma pack(1)
 
 // On-the-wire header. All uint16 are in network order.
 // Used internally in DnsQuery and DnsResponseParser.
 struct NET_EXPORT_PRIVATE Header {
   uint16 id;
-  uint8 flags[2];
+  uint16 flags;
   uint16 qdcount;
   uint16 ancount;
   uint16 nscount;
   uint16 arcount;
 };
 
 #pragma pack(pop)
 
 static const uint8 kLabelMask = 0xc0;
 static const uint8 kLabelPointer = 0xc0;
@@ skipping 18 matching lines @@
 
 // DNS rcode values.
 static const uint8 kRcodeMask = 0xf;
 static const uint8 kRcodeNOERROR = 0;
 static const uint8 kRcodeFORMERR = 1;
 static const uint8 kRcodeSERVFAIL = 2;
 static const uint8 kRcodeNXDOMAIN = 3;
 static const uint8 kRcodeNOTIMP = 4;
 static const uint8 kRcodeREFUSED = 5;
 
+// DNS flags.
+static const uint16 kFlagResponse = 0x8000;
+static const uint16 kFlagRA = 0x80;
+static const uint16 kFlagRD = 0x100;
+static const uint16 kFlagTC = 0x200;
+static const uint16 kFlagAA = 0x400;
+
 }  // namespace dns_protocol
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_PROTOCOL_H_