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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_MAPPED_HOST_RESOLVER_H_
#define NET_DNS_MAPPED_HOST_RESOLVER_H_
#include <memory>
#include <optional>
#include <string_view>
#include <vector>
#include "base/values.h"
#include "net/base/completion_once_callback.h"
#include "net/base/host_mapping_rules.h"
#include "net/base/net_export.h"
#include "net/base/network_anonymization_key.h"
#include "net/dns/dns_config.h"
#include "net/dns/host_resolver.h"
#include "net/log/net_log_with_source.h"
#include "url/scheme_host_port.h"
namespace net {
// This class wraps an existing HostResolver instance, but modifies the
// request before passing it off to |impl|. This is different from
// MockHostResolver which does the remapping at the HostResolverProc
// layer, so it is able to preserve the effectiveness of the cache.
class NET_EXPORT MappedHostResolver : public HostResolver {
public:
// Creates a MappedHostResolver that forwards all of its requests through
// |impl|.
explicit MappedHostResolver(std::unique_ptr<HostResolver> impl);
~MappedHostResolver() override;
void OnShutdown() override;
// Adds a rule to this mapper. The format of the rule can be one of:
//
// "MAP" <hostname_pattern> <replacement_host> [":" <replacement_port>]
// "EXCLUDE" <hostname_pattern>
//
// The <replacement_host> can be either a hostname, or an IP address literal,
// or "^NOTFOUND". If it is "^NOTFOUND" then all matched hostnames will fail
// to be resolved with ERR_NAME_NOT_RESOLVED.
//
// Returns true if the rule was successfully parsed and added.
bool AddRuleFromString(std::string_view rule_string) {
return rules_.AddRuleFromString(rule_string);
}
// Takes a comma separated list of rules, and assigns them to this resolver.
void SetRulesFromString(std::string_view rules_string) {
rules_.SetRulesFromString(rules_string);
}
// HostResolver methods:
std::unique_ptr<ResolveHostRequest> CreateRequest(
url::SchemeHostPort host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
std::optional<ResolveHostParameters> optional_parameters) override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
const HostPortPair& host,
const NetworkAnonymizationKey& network_anonymization_key,
const NetLogWithSource& net_log,
const std::optional<ResolveHostParameters>& optional_parameters) override;
std::unique_ptr<ServiceEndpointRequest> CreateServiceEndpointRequest(
Host host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
ResolveHostParameters parameters) override;
std::unique_ptr<ProbeRequest> CreateDohProbeRequest() override;
HostCache* GetHostCache() override;
base::Value::Dict GetDnsConfigAsValue() const override;
void SetRequestContext(URLRequestContext* request_context) override;
bool IsHappyEyeballsV3Enabled() const override;
HostResolverManager* GetManagerForTesting() override;
private:
std::unique_ptr<HostResolver> impl_;
HostMappingRules rules_;
};
} // namespace net
#endif // NET_DNS_MAPPED_HOST_RESOLVER_H_
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