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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_MAPPED_HOST_RESOLVER_H_
#define NET_DNS_MAPPED_HOST_RESOLVER_H_
#include <memory>
#include <string>
#include "net/base/host_mapping_rules.h"
#include "net/base/net_export.h"
#include "net/dns/host_resolver.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;
// 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(const std::string& rule_string) {
return rules_.AddRuleFromString(rule_string);
}
// Takes a comma separated list of rules, and assigns them to this resolver.
void SetRulesFromString(const std::string& rules_string) {
rules_.SetRulesFromString(rules_string);
}
// HostResolver methods:
int Resolve(const RequestInfo& info,
RequestPriority priority,
AddressList* addresses,
const CompletionCallback& callback,
std::unique_ptr<Request>* request,
const NetLogWithSource& net_log) override;
int ResolveFromCache(const RequestInfo& info,
AddressList* addresses,
const NetLogWithSource& net_log) override;
int ResolveStaleFromCache(const RequestInfo& info,
AddressList* addresses,
HostCache::EntryStaleness* stale_info,
const NetLogWithSource& source_net_log) override;
void SetDnsClientEnabled(bool enabled) override;
HostCache* GetHostCache() override;
bool HasCached(base::StringPiece hostname,
HostCache::Entry::Source* source_out,
HostCache::EntryStaleness* stale_out) const override;
std::unique_ptr<base::Value> GetDnsConfigAsValue() const override;
void SetNoIPv6OnWifi(bool no_ipv6_on_wifi) override;
bool GetNoIPv6OnWifi() override;
private:
// Modify the request |info| according to |rules_|. Returns either OK or
// the network error code that the hostname's resolution mapped to.
int ApplyRules(RequestInfo* info) const;
std::unique_ptr<HostResolver> impl_;
HostMappingRules rules_;
};
} // namespace net
#endif // NET_DNS_MAPPED_HOST_RESOLVER_H_
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