// Copyright 2018 The Chromium OS 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 SHILL_SOCKET_INFO_READER_H_
#define SHILL_SOCKET_INFO_READER_H_

#include <string>
#include <vector>

#include <base/files/file_path.h>
#include <base/macros.h>
#include <gtest/gtest_prod.h>

#include "shill/socket_info.h"

namespace shill {

class SocketInfoReader {
 public:
  SocketInfoReader();
  SocketInfoReader(const SocketInfoReader&) = delete;
  SocketInfoReader& operator=(const SocketInfoReader&) = delete;

  virtual ~SocketInfoReader();

  // Returns the file path (/proc/net/tcp by default) from where TCP/IPv4
  // socket information are read. Overloadded by unit tests to return a
  // different file path.
  virtual base::FilePath GetTcpv4SocketInfoFilePath() const;

  // Returns the file path (/proc/net/tcp6 by default) from where TCP/IPv6
  // socket information are read. Overloadded by unit tests to return a
  // different file path.
  virtual base::FilePath GetTcpv6SocketInfoFilePath() const;

  // Loads TCP socket information from /proc/net/tcp and /proc/net/tcp6.
  // Existing entries in |info_list| are always discarded. Returns false
  // if when neither /proc/net/tcp nor /proc/net/tcp6 can be read.
  virtual bool LoadTcpSocketInfo(std::vector<SocketInfo>* info_list);

 private:
  FRIEND_TEST(SocketInfoReaderTest, AppendSocketInfo);
  FRIEND_TEST(SocketInfoReaderTest, ParseConnectionState);
  FRIEND_TEST(SocketInfoReaderTest, ParseIPAddress);
  FRIEND_TEST(SocketInfoReaderTest, ParseIPAddressAndPort);
  FRIEND_TEST(SocketInfoReaderTest, ParsePort);
  FRIEND_TEST(SocketInfoReaderTest, ParseSocketInfo);
  FRIEND_TEST(SocketInfoReaderTest, ParseTimerState);
  FRIEND_TEST(SocketInfoReaderTest, ParseTransimitAndReceiveQueueValues);

  bool AppendSocketInfo(const base::FilePath& info_file_path,
                        std::vector<SocketInfo>* info_list);
  bool ParseSocketInfo(const std::string& input, SocketInfo* socket_info);
  bool ParseIPAddressAndPort(const std::string& input,
                             IPAddress* ip_address,
                             uint16_t* port);
  bool ParseIPAddress(const std::string& input, IPAddress* ip_address);
  bool ParsePort(const std::string& input, uint16_t* port);
  bool ParseTransimitAndReceiveQueueValues(const std::string& input,
                                           uint64_t* transmit_queue_value,
                                           uint64_t* receive_queue_value);
  bool ParseConnectionState(const std::string& input,
                            SocketInfo::ConnectionState* connection_state);
  bool ParseTimerState(const std::string& input,
                       SocketInfo::TimerState* timer_state);
};

}  // namespace shill

#endif  // SHILL_SOCKET_INFO_READER_H_