// 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_CONFIG_SERVICE_POSIX_H_
#define NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
#pragma once

#include <sys/types.h>
#include <netinet/in.h>
#include <resolv.h>

#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/net_export.h"
#include "net/dns/dns_config_service.h"

namespace net {

class FilePathWatcherWrapper;

// Use DnsConfigService::CreateSystemService to use it outside of tests.
namespace internal {

class NET_EXPORT_PRIVATE DnsConfigServicePosix
    : NON_EXPORTED_BASE(public DnsConfigService) {
 public:
  DnsConfigServicePosix();
  virtual ~DnsConfigServicePosix();

  virtual void Watch(const CallbackType& callback) OVERRIDE;

 private:
  void OnConfigChanged(bool watch_succeeded);
  void OnHostsChanged(bool watch_succeeded);

  scoped_ptr<FilePathWatcherWrapper> config_watcher_;
  scoped_ptr<FilePathWatcherWrapper> hosts_watcher_;

  scoped_refptr<SerialWorker> config_reader_;
  scoped_refptr<SerialWorker> hosts_reader_;

  DISALLOW_COPY_AND_ASSIGN(DnsConfigServicePosix);
};

// Fills in |dns_config| from |res|.
bool NET_EXPORT_PRIVATE ConvertResStateToDnsConfig(
    const struct __res_state& res, DnsConfig* dns_config);

}  // namespace internal

}  // namespace net

#endif  // NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_