PortForwarder.h

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// Copyright (c) FIRST and other WPILib contributors.
// Open Source Software; you can modify and/or share it under the terms of
// the WPILib BSD license file in the root directory of this project.
 
#ifndef WPINET_PORTFORWARDER_H_
#define WPINET_PORTFORWARDER_H_
 
#pragma once
 
#include <memory>
#include <string_view>
 
namespace wpi {
 
/**
 * Forward ports to another host.  This is primarily useful for accessing
 * Ethernet-connected devices from a computer tethered to the RoboRIO USB port.
 */
class PortForwarder {
 public:
  PortForwarder(const PortForwarder&) = delete;
  PortForwarder& operator=(const PortForwarder&) = delete;
 
  /**
   * Get an instance of the PortForwarder class.
   *
   * This is a singleton to guarantee that there is only a single instance
   * regardless of how many times GetInstance is called.
   */
  static PortForwarder& GetInstance();
 
  /**
   * Forward a local TCP port to a remote host and port.
   * Note that local ports less than 1024 won't work as a normal user.
   *
   * @param port       local port number
   * @param remoteHost remote IP address / DNS name
   * @param remotePort remote port number
   */
  void Add(unsigned int port, std::string_view remoteHost,
           unsigned int remotePort);
 
  /**
   * Stop TCP forwarding on a port.
   *
   * @param port local port number
   */
  void Remove(unsigned int port);
 
 private:
  PortForwarder();
 
  struct Impl;
  std::unique_ptr<Impl> m_impl;
};
 
}  // namespace wpi
 
#endif  // WPINET_PORTFORWARDER_H_