Cache for mDNS records

net/dns/record_rdata.h

 // Copyright (c) 2013 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_RECORD_RDATA_H_
 #define NET_DNS_RECORD_RDATA_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "net/base/big_endian.h"
 #include "net/base/net_export.h"
 #include "net/base/net_util.h"
 #include "net/dns/dns_protocol.h"
 
 namespace net {
 
 class DnsRecordParser;
 
 // Parsed represenation of the extra data in a record. Does not include standard
 // DNS record data such as TTL, Name, Type and Class.
 class NET_EXPORT_PRIVATE RecordRdata {
  public:
   virtual ~RecordRdata() {}
 
+  virtual bool IsEqual(const RecordRdata* other) const = 0;
+  virtual uint16 Type() const = 0;
+
  protected:
   RecordRdata();
 
   DISALLOW_COPY_AND_ASSIGN(RecordRdata);
 };
 
 // SRV record format (http://www.ietf.org/rfc/rfc2782.txt):
 // 2 bytes network-order unsigned priority
 // 2 bytes network-order unsigned weight
 // 2 bytes network-order unsigned port
 // target: domain name (on-the-wire representation)
 class NET_EXPORT_PRIVATE SrvRecordRdata : public RecordRdata {
  public:
   static const uint16 kType = dns_protocol::kTypeSRV;
 
   virtual ~SrvRecordRdata();
   static scoped_ptr<SrvRecordRdata> Create(const base::StringPiece& data,
                                            const DnsRecordParser& parser);
 
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
+
   uint16 priority() const { return priority_; }
   uint16 weight() const { return weight_; }
   uint16 port() const { return port_; }
 
   const std::string& target() const { return target_; }
 
  private:
   SrvRecordRdata();
 
   uint16 priority_;
   uint16 weight_;
   uint16 port_;
 
   std::string target_;
 
   DISALLOW_COPY_AND_ASSIGN(SrvRecordRdata);
 };
 
 // A Record format (http://www.ietf.org/rfc/rfc1035.txt):
 // 4 bytes for IP address.
 class NET_EXPORT_PRIVATE ARecordRdata : public RecordRdata {
  public:
   static const uint16 kType = dns_protocol::kTypeA;
 
   virtual ~ARecordRdata();
   static scoped_ptr<ARecordRdata> Create(const base::StringPiece& data,
                                          const DnsRecordParser& parser);
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
 
   const IPAddressNumber& address() const { return address_; }
 
  private:
   ARecordRdata();
 
   IPAddressNumber address_;
 
   DISALLOW_COPY_AND_ASSIGN(ARecordRdata);
 };
 
+// AAAA Record format (http://www.ietf.org/rfc/rfc1035.txt):
+// 16 bytes for IP address.
+class NET_EXPORT_PRIVATE AAAARecordRdata : public RecordRdata {
+ public:
+  static const uint16 kType = dns_protocol::kTypeAAAA;
+
+  virtual ~AAAARecordRdata();
+  static scoped_ptr<AAAARecordRdata> Create(const base::StringPiece& data,
+                                         const DnsRecordParser& parser);
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
+
+  const IPAddressNumber& address() const { return address_; }
+
+ private:
+  AAAARecordRdata();
+
+  IPAddressNumber address_;
+
+  DISALLOW_COPY_AND_ASSIGN(AAAARecordRdata);
+};
+
 // CNAME record format (http://www.ietf.org/rfc/rfc1035.txt):
 // cname: On the wire representation of domain name.
 class NET_EXPORT_PRIVATE CnameRecordRdata : public RecordRdata {
  public:
   static const uint16 kType = dns_protocol::kTypeCNAME;
 
   virtual ~CnameRecordRdata();
   static scoped_ptr<CnameRecordRdata> Create(const base::StringPiece& data,
                                              const DnsRecordParser& parser);
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
 
   std::string cname() const { return cname_; }
 
  private:
   CnameRecordRdata();
 
   std::string cname_;
 
   DISALLOW_COPY_AND_ASSIGN(CnameRecordRdata);
 };
 
 // PTR record format (http://www.ietf.org/rfc/rfc1035.txt):
 // domain: On the wire representation of domain name.
 class NET_EXPORT_PRIVATE PtrRecordRdata : public RecordRdata {
  public:
   static const uint16 kType = dns_protocol::kTypePTR;
 
   virtual ~PtrRecordRdata();
   static scoped_ptr<PtrRecordRdata> Create(const base::StringPiece& data,
                                            const DnsRecordParser& parser);
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
 
   std::string ptrdomain() const { return ptrdomain_; }
 
  private:
   PtrRecordRdata();
 
   std::string ptrdomain_;
 
   DISALLOW_COPY_AND_ASSIGN(PtrRecordRdata);
 };
 
 // TXT record format (http://www.ietf.org/rfc/rfc1035.txt):
 // texts: One or more <character-string>s.
 // a <character-string> is a length octet followed by as many characters.
 class NET_EXPORT_PRIVATE TxtRecordRdata : public RecordRdata {
  public:
   static const uint16 kType = dns_protocol::kTypeTXT;
 
   virtual ~TxtRecordRdata();
   static scoped_ptr<TxtRecordRdata> Create(const base::StringPiece& data,
                                            const DnsRecordParser& parser);
+  virtual bool IsEqual(const RecordRdata* other) const OVERRIDE;
+  virtual uint16 Type() const OVERRIDE;
 
   const std::vector<std::string>& texts() const { return texts_; }
 
  private:
   TxtRecordRdata();
 
   std::vector<std::string> texts_;
 
   DISALLOW_COPY_AND_ASSIGN(TxtRecordRdata);
 };
-}
+
+}  // namespace net
 
 #endif  // NET_DNS_RECORD_RDATA_H_