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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_DNS_HOSTS_H_
#define NET_DNS_DNS_HOSTS_H_
#pragma once
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "base/callback.h"
#include "base/file_path.h"
#include "net/base/address_family.h"
#include "net/base/net_export.h"
#include "net/base/net_util.h" // can't forward-declare IPAddressNumber
#include "net/dns/serial_worker.h"
namespace net {
// Parsed results of a Hosts file.
//
// Although Hosts files map IP address to a list of domain names, for name
// resolution the desired mapping direction is: domain name to IP address.
// When parsing Hosts, we apply the "first hit" rule as Windows and glibc do.
// With a Hosts file of:
// 300.300.300.300 localhost # bad ip
// 127.0.0.1 localhost
// 10.0.0.1 localhost
// The expected resolution of localhost is 127.0.0.1.
typedef std::pair<std::string, AddressFamily> DnsHostsKey;
typedef std::map<DnsHostsKey, IPAddressNumber> DnsHosts;
// Parses |contents| (as read from /etc/hosts or equivalent) and stores results
// in |dns_hosts|. Invalid lines are ignored (as in most implementations).
void NET_EXPORT_PRIVATE ParseHosts(const std::string& contents,
DnsHosts* dns_hosts);
// A SerialWorker that reads a HOSTS file and runs Callback.
// Call WorkNow() to indicate file needs to be re-read.
// Call Cancel() to disable the callback.
class NET_EXPORT_PRIVATE DnsHostsReader
: NON_EXPORTED_BASE(public SerialWorker) {
public:
typedef base::Callback<void(const DnsHosts& hosts)> CallbackType;
DnsHostsReader(const FilePath& path, const CallbackType& callback);
private:
virtual ~DnsHostsReader();
virtual void DoWork() OVERRIDE;
virtual void OnWorkFinished() OVERRIDE;
FilePath path_;
CallbackType callback_;
// Written in DoWork, read in OnWorkFinished, no locking necessary.
DnsHosts dns_hosts_;
bool success_;
DISALLOW_COPY_AND_ASSIGN(DnsHostsReader);
};
} // namespace net
#endif // NET_DNS_DNS_HOSTS_H_
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