net/dns/record_rdata.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_DNS_RECORD_RDATA_H_
   6 #define NET_DNS_RECORD_RDATA_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/strings/string_piece.h"
  15 #include "net/base/net_export.h"
  16 #include "net/base/net_util.h"
  17 #include "net/dns/dns_protocol.h"
  18
  19 namespace net {
  20
  21 class DnsRecordParser;
  22
  23 // Parsed represenation of the extra data in a record. Does not include standard
  24 // DNS record data such as TTL, Name, Type and Class.
  25 class NET_EXPORT_PRIVATE RecordRdata {
  26  public:
  27   virtual ~RecordRdata() {}
  28
  29   virtual bool IsEqual(const RecordRdata* other) const = 0;
  30   virtual uint16 Type() const = 0;
  31
  32  protected:
  33   RecordRdata();
  34
  35   DISALLOW_COPY_AND_ASSIGN(RecordRdata);
  36 };
  37
  38 // SRV record format (http://www.ietf.org/rfc/rfc2782.txt):
  39 // 2 bytes network-order unsigned priority
  40 // 2 bytes network-order unsigned weight
  41 // 2 bytes network-order unsigned port
  42 // target: domain name (on-the-wire representation)
  43 class NET_EXPORT_PRIVATE SrvRecordRdata : public RecordRdata {
  44  public:
  45   static const uint16 kType = dns_protocol::kTypeSRV;
  46
  47   ~SrvRecordRdata() override;
  48   static scoped_ptr<SrvRecordRdata> Create(const base::StringPiece& data,
  49                                            const DnsRecordParser& parser);
  50
  51   bool IsEqual(const RecordRdata* other) const override;
  52   uint16 Type() const override;
  53
  54   uint16 priority() const { return priority_; }
  55   uint16 weight() const { return weight_; }
  56   uint16 port() const { return port_; }
  57
  58   const std::string& target() const { return target_; }
  59
  60  private:
  61   SrvRecordRdata();
  62
  63   uint16 priority_;
  64   uint16 weight_;
  65   uint16 port_;
  66
  67   std::string target_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(SrvRecordRdata);
  70 };
  71
  72 // A Record format (http://www.ietf.org/rfc/rfc1035.txt):
  73 // 4 bytes for IP address.
  74 class NET_EXPORT_PRIVATE ARecordRdata : public RecordRdata {
  75  public:
  76   static const uint16 kType = dns_protocol::kTypeA;
  77
  78   ~ARecordRdata() override;
  79   static scoped_ptr<ARecordRdata> Create(const base::StringPiece& data,
  80                                          const DnsRecordParser& parser);
  81   bool IsEqual(const RecordRdata* other) const override;
  82   uint16 Type() const override;
  83
  84   const IPAddressNumber& address() const { return address_; }
  85
  86  private:
  87   ARecordRdata();
  88
  89   IPAddressNumber address_;
  90
  91   DISALLOW_COPY_AND_ASSIGN(ARecordRdata);
  92 };
  93
  94 // AAAA Record format (http://www.ietf.org/rfc/rfc1035.txt):
  95 // 16 bytes for IP address.
  96 class NET_EXPORT_PRIVATE AAAARecordRdata : public RecordRdata {
  97  public:
  98   static const uint16 kType = dns_protocol::kTypeAAAA;
  99
 100   ~AAAARecordRdata() override;
 101   static scoped_ptr<AAAARecordRdata> Create(const base::StringPiece& data,
 102                                          const DnsRecordParser& parser);
 103   bool IsEqual(const RecordRdata* other) const override;
 104   uint16 Type() const override;
 105
 106   const IPAddressNumber& address() const { return address_; }
 107
 108  private:
 109   AAAARecordRdata();
 110
 111   IPAddressNumber address_;
 112
 113   DISALLOW_COPY_AND_ASSIGN(AAAARecordRdata);
 114 };
 115
 116 // CNAME record format (http://www.ietf.org/rfc/rfc1035.txt):
 117 // cname: On the wire representation of domain name.
 118 class NET_EXPORT_PRIVATE CnameRecordRdata : public RecordRdata {
 119  public:
 120   static const uint16 kType = dns_protocol::kTypeCNAME;
 121
 122   ~CnameRecordRdata() override;
 123   static scoped_ptr<CnameRecordRdata> Create(const base::StringPiece& data,
 124                                              const DnsRecordParser& parser);
 125   bool IsEqual(const RecordRdata* other) const override;
 126   uint16 Type() const override;
 127
 128   std::string cname() const { return cname_; }
 129
 130  private:
 131   CnameRecordRdata();
 132
 133   std::string cname_;
 134
 135   DISALLOW_COPY_AND_ASSIGN(CnameRecordRdata);
 136 };
 137
 138 // PTR record format (http://www.ietf.org/rfc/rfc1035.txt):
 139 // domain: On the wire representation of domain name.
 140 class NET_EXPORT_PRIVATE PtrRecordRdata : public RecordRdata {
 141  public:
 142   static const uint16 kType = dns_protocol::kTypePTR;
 143
 144   ~PtrRecordRdata() override;
 145   static scoped_ptr<PtrRecordRdata> Create(const base::StringPiece& data,
 146                                            const DnsRecordParser& parser);
 147   bool IsEqual(const RecordRdata* other) const override;
 148   uint16 Type() const override;
 149
 150   std::string ptrdomain() const { return ptrdomain_; }
 151
 152  private:
 153   PtrRecordRdata();
 154
 155   std::string ptrdomain_;
 156
 157   DISALLOW_COPY_AND_ASSIGN(PtrRecordRdata);
 158 };
 159
 160 // TXT record format (http://www.ietf.org/rfc/rfc1035.txt):
 161 // texts: One or more <character-string>s.
 162 // a <character-string> is a length octet followed by as many characters.
 163 class NET_EXPORT_PRIVATE TxtRecordRdata : public RecordRdata {
 164  public:
 165   static const uint16 kType = dns_protocol::kTypeTXT;
 166
 167   ~TxtRecordRdata() override;
 168   static scoped_ptr<TxtRecordRdata> Create(const base::StringPiece& data,
 169                                            const DnsRecordParser& parser);
 170   bool IsEqual(const RecordRdata* other) const override;
 171   uint16 Type() const override;
 172
 173   const std::vector<std::string>& texts() const { return texts_; }
 174
 175  private:
 176   TxtRecordRdata();
 177
 178   std::vector<std::string> texts_;
 179
 180   DISALLOW_COPY_AND_ASSIGN(TxtRecordRdata);
 181 };
 182
 183 // Only the subset of the NSEC record format required by mDNS is supported.
 184 // Nsec record format is described in http://www.ietf.org/rfc/rfc3845.txt and
 185 // the limited version required for mDNS described in
 186 // http://www.rfc-editor.org/rfc/rfc6762.txt Section 6.1.
 187 class NET_EXPORT_PRIVATE NsecRecordRdata : public RecordRdata {
 188  public:
 189   static const uint16 kType = dns_protocol::kTypeNSEC;
 190
 191   ~NsecRecordRdata() override;
 192   static scoped_ptr<NsecRecordRdata> Create(const base::StringPiece& data,
 193                                             const DnsRecordParser& parser);
 194   bool IsEqual(const RecordRdata* other) const override;
 195   uint16 Type() const override;
 196
 197   // Length of the bitmap in bits.
 198   unsigned bitmap_length() const { return bitmap_.size() * 8; }
 199
 200   // Returns bit i-th bit in the bitmap, where bits withing a byte are organized
 201   // most to least significant. If it is set, a record with rrtype i exists for
 202   // the domain name of this nsec record.
 203   bool GetBit(unsigned i) const;
 204
 205  private:
 206   NsecRecordRdata();
 207
 208   std::vector<uint8> bitmap_;
 209
 210   DISALLOW_COPY_AND_ASSIGN(NsecRecordRdata);
 211 };
 212
 213
 214 }  // namespace net
 215
 216 #endif  // NET_DNS_RECORD_RDATA_H_