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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef NET_BASE_DNS_QUERY_H_ | |
| 6 #define NET_BASE_DNS_QUERY_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include <string> | |
| 10 | |
| 11 #include "net/base/address_family.h" | |
| 12 #include "net/base/io_buffer.h" | |
| 13 #include "net/base/net_util.h" | |
| 14 | |
| 15 namespace net{ | |
| 16 | |
| 17 // A class that encapsulates bits and pieces related to DNS request processing. | |
| 18 class DnsQuery { | |
| 19 public: | |
| 20 // Constructs an object containing an IOBuffer with raw DNS query string | |
| 21 // for |hostname| with the given |address_family|; |port| is here due to | |
| 22 // legacy -- getaddrinfo() takes service name, which is mapped to some | |
| 23 // port and returns sockaddr_in structures with ports filled in, so do we | |
| 24 // -- look at DnsResponse::Parse() to see where it is used. | |
| 25 | |
| 26 // Every generated object has a random ID, hence two objects generated | |
| 27 // with the same set of constructor arguments are generally not equal; | |
| 28 // there is a 1/2^16 chance of them being equal due to size of |id_|. | |
| 29 DnsQuery(const std::string& hostname, AddressFamily address_family, int port); | |
| 30 | |
| 31 // Returns true if the constructed object was valid. | |
| 32 bool IsValid() const { return io_buffer_.get() != NULL; } | |
| 33 | |
| 34 // DnsQuery field accessors. These should only be called on an object | |
| 35 // for whom |IsValid| is true. | |
| 36 int port() const; | |
| 37 uint16 id() const; | |
| 38 uint16 qtype() const; | |
| 39 AddressFamily address_family() const; | |
| 40 const std::string& hostname() const; | |
| 41 | |
| 42 // IOBuffer accessor to be used for writing out the query. | |
| 43 IOBufferWithSize* io_buffer() const; | |
| 44 | |
| 45 private: | |
| 46 // Port to be used by corresponding DnsResponse when filling sockaddr_ins | |
| 47 // to be returned. | |
| 48 int port_; | |
| 49 | |
| 50 // ID of the query. | |
| 51 uint16 id_; | |
| 52 | |
| 53 // Type of query, currently, either A or AAAA. | |
| 54 uint16 qtype_; | |
| 55 | |
| 56 // Address family of the query; used when constructing new object from | |
| 57 // this one. | |
| 58 AddressFamily address_family_; | |
| 59 | |
| 60 // Hostname that we are trying to resolve. | |
| 61 std::string hostname_; | |
| 62 | |
| 63 // Contains query bytes to be consumed by higher level Write() call. | |
| 64 scoped_refptr<IOBufferWithSize> io_buffer_; | |
| 65 | |
| 66 DISALLOW_COPY_AND_ASSIGN(DnsQuery); | |
| 67 }; | |
| 68 | |
| 69 } // namespace net | |
| 70 | |
| 71 #endif // NET_BASE_DNS_QUERY_H_ | |
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Chromium Code Reviews
Issue 7056050:
Revert 87809 - Added DnsQuery class (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/