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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_DNS_DNS_SESSION_H_ |
| 6 #define NET_DNS_DNS_SESSION_H_ |
| 7 #pragma once |
| 8 |
| 9 #include "base/memory/ref_counted.h" |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 #include "base/time.h" |
| 12 #include "net/base/net_export.h" |
| 13 #include "net/base/rand_callback.h" |
| 14 #include "net/dns/dns_config_service.h" |
| 15 |
| 16 namespace net { |
| 17 |
| 18 class ClientSocketFactory; |
| 19 class NetLog; |
| 20 |
| 21 // Session parameters and state shared between DNS transactions. |
| 22 // Ref-counted so that DnsClient::Request can keep working in absence of |
| 23 // DnsClient. |
| 24 class NET_EXPORT_PRIVATE DnsSession |
| 25 : NON_EXPORTED_BASE(public base::RefCounted<DnsSession>) { |
| 26 public: |
| 27 typedef base::Callback<int()> RandCallback; |
| 28 |
| 29 DnsSession(const DnsConfig& config, |
| 30 ClientSocketFactory* factory, |
| 31 const RandIntCallback& rand_int_callback, |
| 32 NetLog* net_log); |
| 33 |
| 34 ClientSocketFactory* socket_factory() const { return socket_factory_.get(); } |
| 35 const DnsConfig& config() const { return config_; } |
| 36 NetLog* net_log() const { return net_log_; } |
| 37 |
| 38 // Return the next random query ID. |
| 39 int NextId() const; |
| 40 |
| 41 // Return the next server address. |
| 42 const IPEndPoint& NextServer(); |
| 43 |
| 44 // Return the timeout for the next transaction. |
| 45 base::TimeDelta NextTimeout(int attempt); |
| 46 |
| 47 private: |
| 48 friend class base::RefCounted<DnsSession>; |
| 49 ~DnsSession(); |
| 50 |
| 51 DnsConfig config_; |
| 52 scoped_ptr<ClientSocketFactory> socket_factory_; |
| 53 RandCallback rand_callback_; |
| 54 NetLog* net_log_; |
| 55 |
| 56 // Current index into |config_.nameservers|. |
| 57 int server_index_; |
| 58 |
| 59 // TODO(szym): add current RTT estimate |
| 60 // TODO(szym): add flag to indicate DNSSEC is supported |
| 61 // TODO(szym): add TCP connection pool to support DNS over TCP |
| 62 // TODO(szym): add UDP socket pool ? |
| 63 |
| 64 DISALLOW_COPY_AND_ASSIGN(DnsSession); |
| 65 }; |
| 66 |
| 67 } // namespace net |
| 68 |
| 69 #endif // NET_DNS_DNS_SESSION_H_ |
| 70 |
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