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