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 // Parses |value| as search list (comma-delimited list of domain names) from 38 // a registry key and stores it in |out|. Returns true on success. Empty 39 // entries (e.g., "chromium.org,,org") terminate the list. Non-ascii hostnames 40 // are converted to punycode. 41 bool NET_EXPORT_PRIVATE ParseSearchList(const base::string16& value, 42 std::vector<std::string>* out); 43 44 // All relevant settings read from registry and IP Helper. This isolates our 45 // logic from system calls and is exposed for unit tests. Keep it an aggregate 46 // struct for easy initialization. 47 struct NET_EXPORT_PRIVATE DnsSystemSettings { 48 // The |set| flag distinguishes between empty and unset values. 49 struct RegString { 50 bool set; 51 base::string16 value; 52 }; 53 54 struct RegDword { 55 bool set; 56 DWORD value; 57 }; 58 59 struct DevolutionSetting { 60 // UseDomainNameDevolution 61 RegDword enabled; 62 // DomainNameDevolutionLevel 63 RegDword level; 64 }; 65 66 // Filled in by GetAdapterAddresses. Note that the alternative 67 // GetNetworkParams does not include IPv6 addresses. 68 scoped_ptr<IP_ADAPTER_ADDRESSES, base::FreeDeleter> addresses; 69 70 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\SearchList 71 RegString policy_search_list; 72 // SYSTEM\CurrentControlSet\Tcpip\Parameters\SearchList 73 RegString tcpip_search_list; 74 // SYSTEM\CurrentControlSet\Tcpip\Parameters\Domain 75 RegString tcpip_domain; 76 // SOFTWARE\Policies\Microsoft\System\DNSClient\PrimaryDnsSuffix 77 RegString primary_dns_suffix; 78 79 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient 80 DevolutionSetting policy_devolution; 81 // SYSTEM\CurrentControlSet\Dnscache\Parameters 82 DevolutionSetting dnscache_devolution; 83 // SYSTEM\CurrentControlSet\Tcpip\Parameters 84 DevolutionSetting tcpip_devolution; 85 86 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\AppendToMultiLabelName 87 RegDword append_to_multi_label_name; 88 89 // True when the Name Resolution Policy Table (NRPT) has at least one rule: 90 // SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\DnsPolicyConfig\Rule* 91 bool have_name_resolution_policy; 92 }; 93 94 enum ConfigParseWinResult { 95 CONFIG_PARSE_WIN_OK = 0, 96 CONFIG_PARSE_WIN_READ_IPHELPER, 97 CONFIG_PARSE_WIN_READ_POLICY_SEARCHLIST, 98 CONFIG_PARSE_WIN_READ_TCPIP_SEARCHLIST, 99 CONFIG_PARSE_WIN_READ_DOMAIN, 100 CONFIG_PARSE_WIN_READ_POLICY_DEVOLUTION, 101 CONFIG_PARSE_WIN_READ_DNSCACHE_DEVOLUTION, 102 CONFIG_PARSE_WIN_READ_TCPIP_DEVOLUTION, 103 CONFIG_PARSE_WIN_READ_APPEND_MULTILABEL, 104 CONFIG_PARSE_WIN_READ_PRIMARY_SUFFIX, 105 CONFIG_PARSE_WIN_BAD_ADDRESS, 106 CONFIG_PARSE_WIN_NO_NAMESERVERS, 107 CONFIG_PARSE_WIN_UNHANDLED_OPTIONS, 108 CONFIG_PARSE_WIN_MAX // Bounding values for enumeration. 109 }; 110 111 // Fills in |dns_config| from |settings|. Exposed for tests. 112 ConfigParseWinResult NET_EXPORT_PRIVATE ConvertSettingsToDnsConfig( 113 const DnsSystemSettings& settings, 114 DnsConfig* dns_config); 115 116 // Use DnsConfigService::CreateSystemService to use it outside of tests. 117 class NET_EXPORT_PRIVATE DnsConfigServiceWin : public DnsConfigService { 118 public: 119 DnsConfigServiceWin(); 120 virtual ~DnsConfigServiceWin(); 121 122 private: 123 class Watcher; 124 class ConfigReader; 125 class HostsReader; 126 127 // DnsConfigService: 128 virtual void ReadNow() OVERRIDE; 129 virtual bool StartWatching() OVERRIDE; 130 131 void OnConfigChanged(bool succeeded); 132 void OnHostsChanged(bool succeeded); 133 134 scoped_ptr<Watcher> watcher_; 135 scoped_refptr<ConfigReader> config_reader_; 136 scoped_refptr<HostsReader> hosts_reader_; 137 138 DISALLOW_COPY_AND_ASSIGN(DnsConfigServiceWin); 139 }; 140 141 } // namespace internal 142 143 } // namespace net 144 145 #endif // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_ 146 147