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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_PUBLIC_WIN_DNS_SYSTEM_SETTINGS_H_
#define NET_DNS_PUBLIC_WIN_DNS_SYSTEM_SETTINGS_H_
#include <winsock2.h>
#include <iphlpapi.h>
#include <iptypes.h>
#include <memory>
#include <string>
#include <vector>
#include "base/memory/free_deleter.h"
#include "base/memory/ref_counted.h"
#include "base/strings/string_piece_forward.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_export.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
// This is an aggregate representation of Windows system DNS configuration and
// can be easily built manually in tests.
struct NET_EXPORT WinDnsSystemSettings {
struct NET_EXPORT DevolutionSetting {
DevolutionSetting();
DevolutionSetting(absl::optional<DWORD> enabled,
absl::optional<DWORD> level);
DevolutionSetting(const DevolutionSetting&);
DevolutionSetting& operator=(const DevolutionSetting&);
~DevolutionSetting();
// UseDomainNameDevolution
absl::optional<DWORD> enabled;
// DomainNameDevolutionLevel
absl::optional<DWORD> level;
};
// Returns true iff |address| is DNS address from IPv6 stateless discovery,
// i.e., matches fec0:0:0:ffff::{1,2,3}.
// http://tools.ietf.org/html/draft-ietf-ipngwg-dns-discovery
static bool IsStatelessDiscoveryAddress(const IPAddress& address);
WinDnsSystemSettings();
~WinDnsSystemSettings();
WinDnsSystemSettings(WinDnsSystemSettings&&);
WinDnsSystemSettings& operator=(WinDnsSystemSettings&&);
// List of nameserver IP addresses.
std::unique_ptr<IP_ADAPTER_ADDRESSES, base::FreeDeleter> addresses;
// SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\SearchList
absl::optional<std::wstring> policy_search_list;
// SYSTEM\CurrentControlSet\Tcpip\Parameters\SearchList
absl::optional<std::wstring> tcpip_search_list;
// SYSTEM\CurrentControlSet\Tcpip\Parameters\Domain
absl::optional<std::wstring> tcpip_domain;
// SOFTWARE\Policies\Microsoft\System\DNSClient\PrimaryDnsSuffix
absl::optional<std::wstring> primary_dns_suffix;
// SOFTWARE\Policies\Microsoft\Windows NT\DNSClient
DevolutionSetting policy_devolution;
// SYSTEM\CurrentControlSet\Dnscache\Parameters
DevolutionSetting dnscache_devolution;
// SYSTEM\CurrentControlSet\Tcpip\Parameters
DevolutionSetting tcpip_devolution;
// SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\AppendToMultiLabelName
absl::optional<DWORD> append_to_multi_label_name;
// True when the Name Resolution Policy Table (NRPT) has at least one rule:
// SOFTWARE\Policies\Microsoft\Windows NT\DNSClient\DnsPolicyConfig\Rule*
// (or)
// SYSTEM\CurrentControlSet\Services\Dnscache\Parameters\DnsPolicyConfig\Rule*
bool have_name_resolution_policy = false;
// True when a proxy is configured via at least one rule:
// SYSTEM\CurrentControlSet\Services\Dnscache\Parameters\DnsConnections
// (or)
// SYSTEM\CurrentControlSet\Services\Dnscache\Parameters\DnsActiveIfs
// (or)
// SYSTEM\CurrentControlSet\Services\Dnscache\Parameters\DnsConnectionsProxies
bool have_proxy = false;
// Gets Windows configured DNS servers from all network adapters, with the
// exception of stateless discovery addresses (see IsStatelessDiscoveryAddress
// above).
absl::optional<std::vector<IPEndPoint>> GetAllNameservers();
};
// Reads WinDnsSystemSettings from IpHelper and the registry, or nullopt on
// errors reading them.
NET_EXPORT absl::optional<WinDnsSystemSettings> ReadWinSystemDnsSettings();
} // namespace net
#endif // NET_DNS_PUBLIC_WIN_DNS_SYSTEM_SETTINGS_H_
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