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95 lines
2.6 KiB
C++
95 lines
2.6 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_ADDRESS_SORTER_POSIX_H_
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#define NET_DNS_ADDRESS_SORTER_POSIX_H_
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#include <map>
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#include <vector>
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#include "base/macros.h"
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#include "base/threading/thread_checker.h"
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#include "net/base/address_list.h"
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#include "net/base/ip_address.h"
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#include "net/base/net_export.h"
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#include "net/base/network_change_notifier.h"
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#include "net/dns/address_sorter.h"
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namespace net {
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class ClientSocketFactory;
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// This implementation uses explicit policy to perform the sorting. It is not
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// thread-safe and always completes synchronously.
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class NET_EXPORT_PRIVATE AddressSorterPosix
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: public AddressSorter,
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public NetworkChangeNotifier::IPAddressObserver {
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public:
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// Generic policy entry.
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struct PolicyEntry {
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// IPv4 addresses must be mapped to IPv6.
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unsigned char prefix[IPAddress::kIPv6AddressSize];
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unsigned prefix_length;
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unsigned value;
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};
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typedef std::vector<PolicyEntry> PolicyTable;
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enum AddressScope {
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SCOPE_UNDEFINED = 0,
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SCOPE_NODELOCAL = 1,
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SCOPE_LINKLOCAL = 2,
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SCOPE_SITELOCAL = 5,
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SCOPE_ORGLOCAL = 8,
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SCOPE_GLOBAL = 14,
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};
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struct SourceAddressInfo {
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// Values read from policy tables.
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AddressScope scope;
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unsigned label;
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// Values from the OS, matter only if more than one source address is used.
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unsigned prefix_length;
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bool deprecated; // vs. preferred RFC4862
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bool home; // vs. care-of RFC6275
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bool native;
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};
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typedef std::map<IPAddress, SourceAddressInfo> SourceAddressMap;
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explicit AddressSorterPosix(ClientSocketFactory* socket_factory);
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~AddressSorterPosix() override;
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// AddressSorter:
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void Sort(const AddressList& list,
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const CallbackType& callback) const override;
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private:
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friend class AddressSorterPosixTest;
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// NetworkChangeNotifier::IPAddressObserver:
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void OnIPAddressChanged() override;
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// Fills |info| with values for |address| from policy tables.
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void FillPolicy(const IPAddress& address, SourceAddressInfo* info) const;
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// Mutable to allow using default values for source addresses which were not
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// found in most recent OnIPAddressChanged.
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mutable SourceAddressMap source_map_;
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ClientSocketFactory* socket_factory_;
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PolicyTable precedence_table_;
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PolicyTable label_table_;
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PolicyTable ipv4_scope_table_;
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THREAD_CHECKER(thread_checker_);
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DISALLOW_COPY_AND_ASSIGN(AddressSorterPosix);
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};
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} // namespace net
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#endif // NET_DNS_ADDRESS_SORTER_POSIX_H_
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