1 // Copyright (c) 2012 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 #include "net/dns/dns_client.h" 6 7 #include "base/bind.h" 8 #include "base/rand_util.h" 9 #include "net/base/net_log.h" 10 #include "net/dns/address_sorter.h" 11 #include "net/dns/dns_config_service.h" 12 #include "net/dns/dns_session.h" 13 #include "net/dns/dns_socket_pool.h" 14 #include "net/dns/dns_transaction.h" 15 #include "net/socket/client_socket_factory.h" 16 17 namespace net { 18 19 namespace { 20 21 class DnsClientImpl : public DnsClient { 22 public: 23 explicit DnsClientImpl(NetLog* net_log) 24 : address_sorter_(AddressSorter::CreateAddressSorter()), 25 net_log_(net_log) {} 26 27 virtual void SetConfig(const DnsConfig& config) OVERRIDE { 28 factory_.reset(); 29 session_ = NULL; 30 if (config.IsValid() && !config.unhandled_options) { 31 ClientSocketFactory* factory = ClientSocketFactory::GetDefaultFactory(); 32 scoped_ptr<DnsSocketPool> socket_pool( 33 config.randomize_ports ? DnsSocketPool::CreateDefault(factory) 34 : DnsSocketPool::CreateNull(factory)); 35 session_ = new DnsSession(config, 36 socket_pool.Pass(), 37 base::Bind(&base::RandInt), 38 net_log_); 39 factory_ = DnsTransactionFactory::CreateFactory(session_.get()); 40 } 41 } 42 43 virtual const DnsConfig* GetConfig() const OVERRIDE { 44 return session_.get() ? &session_->config() : NULL; 45 } 46 47 virtual DnsTransactionFactory* GetTransactionFactory() OVERRIDE { 48 return session_.get() ? factory_.get() : NULL; 49 } 50 51 virtual AddressSorter* GetAddressSorter() OVERRIDE { 52 return address_sorter_.get(); 53 } 54 55 private: 56 scoped_refptr<DnsSession> session_; 57 scoped_ptr<DnsTransactionFactory> factory_; 58 scoped_ptr<AddressSorter> address_sorter_; 59 60 NetLog* net_log_; 61 }; 62 63 } // namespace 64 65 // static 66 scoped_ptr<DnsClient> DnsClient::CreateClient(NetLog* net_log) { 67 return scoped_ptr<DnsClient>(new DnsClientImpl(net_log)); 68 } 69 70 } // namespace net 71 72