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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef NET_DNS_DNS_QUERY_H_ | 5 #ifndef NET_DNS_DNS_QUERY_H_ |
6 #define NET_DNS_DNS_QUERY_H_ | 6 #define NET_DNS_DNS_QUERY_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/basictypes.h" | 9 #include <string> |
| 10 |
10 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
11 #include "base/string_piece.h" | |
12 #include "net/base/net_export.h" | 12 #include "net/base/net_export.h" |
| 13 #include "net/base/rand_callback.h" |
13 | 14 |
14 namespace net { | 15 namespace net { |
15 | 16 |
16 class IOBufferWithSize; | 17 class IOBufferWithSize; |
17 | 18 |
18 // Represents on-the-wire DNS query message as an object. | 19 // Represents on-the-wire DNS query message as an object. |
19 // TODO(szym): add support for the OPT pseudo-RR (EDNS0/DNSSEC). | |
20 class NET_EXPORT_PRIVATE DnsQuery { | 20 class NET_EXPORT_PRIVATE DnsQuery { |
21 public: | 21 public: |
22 // Constructs a query message from |qname| which *MUST* be in a valid | 22 // Constructs a query message from |qname| which *MUST* be in a valid |
23 // DNS name format, and |qtype|. The qclass is set to IN. | 23 // DNS name format, and |qtype| which must be either kDNS_A or kDNS_AAAA. |
24 DnsQuery(uint16 id, const base::StringPiece& qname, uint16 qtype); | 24 |
| 25 // Every generated object has a random ID, hence two objects generated |
| 26 // with the same set of constructor arguments are generally not equal; |
| 27 // there is a 1/2^16 chance of them being equal due to size of |id_|. |
| 28 DnsQuery(const std::string& qname, |
| 29 uint16 qtype, |
| 30 const RandIntCallback& rand_int_cb); |
25 ~DnsQuery(); | 31 ~DnsQuery(); |
26 | 32 |
27 // Clones |this| verbatim, with ID field of the header set to |id|. | 33 // Clones |this| verbatim, with ID field of the header regenerated. |
28 DnsQuery* CloneWithNewId(uint16 id) const; | 34 DnsQuery* CloneWithNewId() const; |
29 | 35 |
30 // DnsQuery field accessors. | 36 // DnsQuery field accessors. |
31 uint16 id() const; | 37 uint16 id() const; |
32 base::StringPiece qname() const; | |
33 uint16 qtype() const; | 38 uint16 qtype() const; |
34 | 39 |
35 // Returns the Question section of the query. Used when matching the | 40 // Returns the size of the Question section of the query. Used when |
36 // response. | 41 // matching the response. |
37 base::StringPiece question() const; | 42 size_t question_size() const; |
| 43 |
| 44 // Returns pointer to the Question section of the query. Used when |
| 45 // matching the response. |
| 46 const char* question_data() const; |
38 | 47 |
39 // IOBuffer accessor to be used for writing out the query. | 48 // IOBuffer accessor to be used for writing out the query. |
40 IOBufferWithSize* io_buffer() const { return io_buffer_; } | 49 IOBufferWithSize* io_buffer() const { return io_buffer_; } |
41 | 50 |
42 private: | 51 private: |
43 DnsQuery(const DnsQuery& orig, uint16 id); | 52 const std::string qname() const; |
| 53 |
| 54 // Randomizes ID field of the query message. |
| 55 void RandomizeId(); |
44 | 56 |
45 // Size of the DNS name (*NOT* hostname) we are trying to resolve; used | 57 // Size of the DNS name (*NOT* hostname) we are trying to resolve; used |
46 // to calculate offsets. | 58 // to calculate offsets. |
47 size_t qname_size_; | 59 size_t qname_size_; |
48 | 60 |
49 // Contains query bytes to be consumed by higher level Write() call. | 61 // Contains query bytes to be consumed by higher level Write() call. |
50 scoped_refptr<IOBufferWithSize> io_buffer_; | 62 scoped_refptr<IOBufferWithSize> io_buffer_; |
51 | 63 |
| 64 // PRNG function for generating IDs. |
| 65 RandIntCallback rand_int_cb_; |
| 66 |
52 DISALLOW_COPY_AND_ASSIGN(DnsQuery); | 67 DISALLOW_COPY_AND_ASSIGN(DnsQuery); |
53 }; | 68 }; |
54 | 69 |
55 } // namespace net | 70 } // namespace net |
56 | 71 |
57 #endif // NET_DNS_DNS_QUERY_H_ | 72 #endif // NET_DNS_DNS_QUERY_H_ |
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