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// Copyright 2018 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.
#include <memory>
#include <string>
#include <vector>
#include "base/time/time.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_export.h"
#include "net/dns/dns_hosts.h"
namespace base {
class Value;
namespace net {
// Default to 1 second timeout (before exponential backoff).
constexpr base::TimeDelta kDnsDefaultTimeout = base::TimeDelta::FromSeconds(1);
// DnsConfig stores configuration of the system resolver.
struct NET_EXPORT DnsConfig {
DnsConfig(const DnsConfig& other);
DnsConfig(DnsConfig&& other);
DnsConfig& operator=(const DnsConfig& other);
DnsConfig& operator=(DnsConfig&& other);
bool Equals(const DnsConfig& d) const;
bool EqualsIgnoreHosts(const DnsConfig& d) const;
void CopyIgnoreHosts(const DnsConfig& src);
// Returns a Value representation of |this|. For performance reasons, the
// Value only contains the number of hosts rather than the full list.
std::unique_ptr<base::Value> ToValue() const;
bool IsValid() const { return !nameservers.empty(); }
struct NET_EXPORT DnsOverHttpsServerConfig {
DnsOverHttpsServerConfig(const std::string& server_template, bool use_post);
bool operator==(const DnsOverHttpsServerConfig& other) const;
std::string server_template;
bool use_post;
// List of name server addresses.
std::vector<IPEndPoint> nameservers;
// Suffix search list; used on first lookup when number of dots in given name
// is less than |ndots|.
std::vector<std::string> search;
DnsHosts hosts;
// True if there are options set in the system configuration that are not yet
// supported by DnsClient.
bool unhandled_options;
// AppendToMultiLabelName: is suffix search performed for multi-label names?
// True, except on Windows where it can be configured.
bool append_to_multi_label_name;
// Indicates that source port randomization is required. This uses additional
// resources on some platforms.
bool randomize_ports;
// Resolver options; see man resolv.conf.
// Minimum number of dots before global resolution precedes |search|.
int ndots;
// Time between retransmissions, see res_state.retrans.
base::TimeDelta timeout;
// Maximum number of attempts, see res_state.retry.
int attempts;
// Round robin entries in |nameservers| for subsequent requests.
bool rotate;
// Indicates system configuration uses local IPv6 connectivity, e.g.,
// DirectAccess. This is exposed for HostResolver to skip IPv6 probes,
// as it may cause them to return incorrect results.
bool use_local_ipv6;
// List of servers to query over HTTPS, queried in order
// (
std::vector<DnsOverHttpsServerConfig> dns_over_https_servers;
} // namespace net