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| 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_ | |
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