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93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_MAPPED_HOST_RESOLVER_H_
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#define NET_DNS_MAPPED_HOST_RESOLVER_H_
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#include <memory>
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#include <string>
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#include "net/base/completion_once_callback.h"
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#include "net/base/host_mapping_rules.h"
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#include "net/base/net_export.h"
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#include "net/dns/host_resolver.h"
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namespace net {
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// This class wraps an existing HostResolver instance, but modifies the
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// request before passing it off to |impl|. This is different from
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// MockHostResolver which does the remapping at the HostResolverProc
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// layer, so it is able to preserve the effectiveness of the cache.
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class NET_EXPORT MappedHostResolver : public HostResolver {
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public:
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// Creates a MappedHostResolver that forwards all of its requests through
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// |impl|.
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explicit MappedHostResolver(std::unique_ptr<HostResolver> impl);
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~MappedHostResolver() override;
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// Adds a rule to this mapper. The format of the rule can be one of:
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//
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// "MAP" <hostname_pattern> <replacement_host> [":" <replacement_port>]
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// "EXCLUDE" <hostname_pattern>
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//
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// The <replacement_host> can be either a hostname, or an IP address literal,
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// or "~NOTFOUND". If it is "~NOTFOUND" then all matched hostnames will fail
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// to be resolved with ERR_NAME_NOT_RESOLVED.
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//
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// Returns true if the rule was successfully parsed and added.
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bool AddRuleFromString(const std::string& rule_string) {
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return rules_.AddRuleFromString(rule_string);
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}
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// Takes a comma separated list of rules, and assigns them to this resolver.
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void SetRulesFromString(const std::string& rules_string) {
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rules_.SetRulesFromString(rules_string);
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}
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// HostResolver methods:
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std::unique_ptr<ResolveHostRequest> CreateRequest(
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const HostPortPair& host,
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const NetLogWithSource& net_log,
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const base::Optional<ResolveHostParameters>& optional_parameters)
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override;
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int Resolve(const RequestInfo& info,
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RequestPriority priority,
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AddressList* addresses,
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CompletionOnceCallback callback,
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std::unique_ptr<Request>* request,
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const NetLogWithSource& net_log) override;
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int ResolveFromCache(const RequestInfo& info,
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AddressList* addresses,
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const NetLogWithSource& net_log) override;
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int ResolveStaleFromCache(const RequestInfo& info,
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AddressList* addresses,
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HostCache::EntryStaleness* stale_info,
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const NetLogWithSource& source_net_log) override;
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void SetDnsClientEnabled(bool enabled) override;
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HostCache* GetHostCache() override;
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bool HasCached(base::StringPiece hostname,
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HostCache::Entry::Source* source_out,
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HostCache::EntryStaleness* stale_out) const override;
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std::unique_ptr<base::Value> GetDnsConfigAsValue() const override;
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void SetNoIPv6OnWifi(bool no_ipv6_on_wifi) override;
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bool GetNoIPv6OnWifi() override;
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private:
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class AlwaysErrorRequestImpl;
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// Modify the request |info| according to |rules_|. Returns either OK or
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// the network error code that the hostname's resolution mapped to.
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int ApplyRules(RequestInfo* info) const;
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std::unique_ptr<HostResolver> impl_;
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HostMappingRules rules_;
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};
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} // namespace net
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#endif // NET_DNS_MAPPED_HOST_RESOLVER_H_
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