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 #ifndef NET_DNS_DNS_CONFIG_SERVICE_WIN_H_ 6 #define NET_DNS_DNS_CONFIG_SERVICE_WIN_H_ 7 8 // The sole purpose of dns_config_service_win.h is for unittests so we just 9 // include these headers here. 10 #include <winsock2.h> 11 #include <iphlpapi.h> 12 13 #include <string> 14 #include <vector> 15 16 #include "base/memory/ref_counted.h" 17 #include "base/memory/scoped_ptr.h" 18 #include "base/strings/string16.h" 19 #include "net/base/net_export.h" 20 #include "net/dns/dns_config_service.h" 21 22 // The general effort of DnsConfigServiceWin is to configure |nameservers| and 23 // |search| in DnsConfig. The settings are stored in the Windows registry, but 24 // to simplify the task we use the IP Helper API wherever possible. That API 25 // yields the complete and ordered |nameservers|, but to determine |search| we 26 // need to use the registry. On Windows 7, WMI does return the correct |search| 27 // but on earlier versions it is insufficient. 28 // 29 // Experimental evaluation of Windows behavior suggests that domain parsing is 30 // naive. Domain suffixes in |search| are not validated until they are appended 31 // to the resolved name. We attempt to replicate this behavior. 32 33 namespace net { 34 35 namespace internal { 36 37 // Registry key paths. 38 const wchar_t* const kTcpipPath = 39 L"SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"; 40 const wchar_t* const kTcpip6Path = 41 L"SYSTEM\\CurrentControlSet\\Services\\Tcpip6\\Parameters"; 42 const wchar_t* const kDnscachePath = 43 L"SYSTEM\\CurrentControlSet\\Services\\Dnscache\\Parameters"; 44 const wchar_t* const kPolicyPath = 45 L"SOFTWARE\\Policies\\Microsoft\\Windows NT\\DNSClient"; 46 47 // Returns the path to the HOSTS file. 48 base::FilePath GetHostsPath(); 49 50 // Parses |value| as search list (comma-delimited list of domain names) from 51 // a registry key and stores it in |out|. Returns true on success. Empty 52 // entries (e.g., "chromium.org,,org") terminate the list. Non-ascii hostnames 53 // are converted to punycode. 54 bool NET_EXPORT_PRIVATE ParseSearchList(const base::string16& value, 55 std::vector<std::string>* out); 56 57 // All relevant settings read from registry and IP Helper. This isolates our 58 // logic from system calls and is exposed for unit tests. Keep it an aggregate 59 // struct for easy initialization. 60 struct NET_EXPORT_PRIVATE DnsSystemSettings { 61 // The |set| flag distinguishes between empty and unset values. 62 struct RegString { 63 bool set; 64 base::string16 value; 65 }; 66 67 struct RegDword { 68 bool set; 69 DWORD value; 70 }; 71 72 struct DevolutionSetting { 73 // UseDomainNameDevolution 74 RegDword enabled; 75 // DomainNameDevolutionLevel 76 RegDword level; 77 }; 78 79 // Filled in by GetAdapterAddresses. Note that the alternative 80 // GetNetworkParams does not include IPv6 addresses. 81 scoped_ptr_malloc<IP_ADAPTER_ADDRESSES> addresses; 82 83 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\SearchList 84 RegString policy_search_list; 85 // SYSTEM\CurrentControlSet\Tcpip\Parameters\SearchList 86 RegString tcpip_search_list; 87 // SYSTEM\CurrentControlSet\Tcpip\Parameters\Domain 88 RegString tcpip_domain; 89 // SOFTWARE\Policies\Microsoft\System\DNSClient\PrimaryDnsSuffix 90 RegString primary_dns_suffix; 91 92 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient 93 DevolutionSetting policy_devolution; 94 // SYSTEM\CurrentControlSet\Dnscache\Parameters 95 DevolutionSetting dnscache_devolution; 96 // SYSTEM\CurrentControlSet\Tcpip\Parameters 97 DevolutionSetting tcpip_devolution; 98 99 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\AppendToMultiLabelName 100 RegDword append_to_multi_label_name; 101 }; 102 103 enum ConfigParseWinResult { 104 CONFIG_PARSE_WIN_OK = 0, 105 CONFIG_PARSE_WIN_READ_IPHELPER, 106 CONFIG_PARSE_WIN_READ_POLICY_SEARCHLIST, 107 CONFIG_PARSE_WIN_READ_TCPIP_SEARCHLIST, 108 CONFIG_PARSE_WIN_READ_DOMAIN, 109 CONFIG_PARSE_WIN_READ_POLICY_DEVOLUTION, 110 CONFIG_PARSE_WIN_READ_DNSCACHE_DEVOLUTION, 111 CONFIG_PARSE_WIN_READ_TCPIP_DEVOLUTION, 112 CONFIG_PARSE_WIN_READ_APPEND_MULTILABEL, 113 CONFIG_PARSE_WIN_READ_PRIMARY_SUFFIX, 114 CONFIG_PARSE_WIN_BAD_ADDRESS, 115 CONFIG_PARSE_WIN_NO_NAMESERVERS, 116 CONFIG_PARSE_WIN_MAX // Bounding values for enumeration. 117 }; 118 119 // Fills in |dns_config| from |settings|. Exposed for tests. 120 ConfigParseWinResult NET_EXPORT_PRIVATE ConvertSettingsToDnsConfig( 121 const DnsSystemSettings& settings, 122 DnsConfig* dns_config); 123 124 // Use DnsConfigService::CreateSystemService to use it outside of tests. 125 class NET_EXPORT_PRIVATE DnsConfigServiceWin : public DnsConfigService { 126 public: 127 DnsConfigServiceWin(); 128 virtual ~DnsConfigServiceWin(); 129 130 private: 131 class Watcher; 132 class ConfigReader; 133 class HostsReader; 134 135 // DnsConfigService: 136 virtual void ReadNow() OVERRIDE; 137 virtual bool StartWatching() OVERRIDE; 138 139 void OnConfigChanged(bool succeeded); 140 void OnHostsChanged(bool succeeded); 141 142 scoped_ptr<Watcher> watcher_; 143 scoped_refptr<ConfigReader> config_reader_; 144 scoped_refptr<HostsReader> hosts_reader_; 145 146 DISALLOW_COPY_AND_ASSIGN(DnsConfigServiceWin); 147 }; 148 149 } // namespace internal 150 151 } // namespace net 152 153 #endif // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_ 154 155
