如何获取特定ip的可用开放端口？ [英] How to get the available open ports for particular ip?

问题描述

当我提供客户端的IP地址时，我必须知道客户端的可用开放端口。比如当我们提供客户端的IP地址时，它会扫描客户端的可用端口。



我尝试过：



使用System;

使用System.Collections.Generic;

使用System.Linq;

使用System.Text;



使用System.Net.Sockets;

使用System.Threading;

使用System.Net;



名称空间SimplePortScan

{

公共类PortScanner

{

私有IP地址_target;

public int Port {get;私人集; }

public bool IsOpen {get;私人集; } $ / $


公共PortScanner（IPAddress目标，int端口）

{

_target = target;

端口=端口;

}



public void ScanPort（）

{

使用（TcpClient TcpClient = new TcpClient（））

{

试试

{

TcpClient.Connect（_target，Port）;

}

catch（SocketException）

{

IsOpen =假;

}



if（IsOpen）

{

使用（ NetworkStream ClientStream = TcpClient.GetStream（））

{

IsOpen = true;

}

}

}

}

}

}

when I give the ip address of the client I have to know the available open ports of the client. like when we give the ip address of the client it will scan the available ports of the client.

What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Net.Sockets;
using System.Threading;
using System.Net;

namespace SimplePortScan
{
public class PortScanner
{
private IPAddress _target;
public int Port { get; private set; }
public bool IsOpen { get; private set; }

public PortScanner(IPAddress target, int port)
{
_target = target;
Port = port;
}

public void ScanPort()
{
using (TcpClient TcpClient = new TcpClient())
{
try
{
TcpClient.Connect(_target, Port);
}
catch (SocketException)
{
IsOpen = false;
}

if (IsOpen)
{
using (NetworkStream ClientStream = TcpClient.GetStream())
{
IsOpen = true;
}
}
}
}
}
}

推荐答案

using System;
using System.Net.Sockets;
using System.Threading.Tasks;

namespace TestApps
{
  internal class Program
  {
    private static void Main(string[] args)
    {
      const string ipAddress = "192.168.1.2";
      const int fromPort = 1;
      const int toPort = 50;
      Parallel.For(fromPort, toPort, port =>
      {
        var isPortOpen = IsPortOpen(ipAddress, port);
        Console.WriteLine(isPortOpen ? "{0} : open" : "{0} : close", port);
      });
    }

    private static bool IsPortOpen(string ipAddress, int port)
    {
      var tcpClient = new TcpClient();
      try
      {
        var result = tcpClient.BeginConnect(ipAddress, port, null, null);
        var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromSeconds(1));
        tcpClient.EndConnect(result);
        tcpClient.Close();
        return success;
      }
      catch
      {
        return false;
      }
    }
  }
}

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