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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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