This article describes the port scanner code based on C# implementation, and the code includes two parts of code: form and logic processing. In the code, create a TcpClient object, use TcpClient to provide client connections for TCP network services, create threads, and create a ThreadStart delegate object. The port scan range is [0-65536], and the scan range can also be customized.
The main function code is as follows:
using System;
using ;
using ;
using ;
using ;
namespace PortScanner
{
public class Form1:
{
private txtAddr;
private txtStart;
private txtEnd;
private label1;
private label2;
private label3;
private splitter1;
private lbResult;
private btnScan;
private progressBar1;
private lblStart;
private lblStop;
private lblNow;
//Custom variables private int port;
private string Addr;
private bool[] done = new bool[65536];
private int start;
private int end;
private Thread scanThread;
private bool OK;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
= new ();
= new ();
= new ();
= new ();
this.label1 = new ();
this.label2 = new ();
this.label3 = new ();
this.splitter1 = new ();
= new ();
this.progressBar1 = new ();
= new ();
= new ();
= new ();
();
//
// lbResult
//
= ;
= new ("Tahoma", 9F, , , (()(0)));
= 14;
= new (224, 0);
= "lbResult";
= new (264, 270);
= 0;
//
// txtAddr
//
= new ("Tahoma", 9F, , , (()(0)));
= new (72, 16);
= "txtAddr";
= new (136, 22);
= 1;
= "";
//
// txtStart
//
= new ("Tahoma", 9F, , , (()(0)));
= new (72, 48);
= "txtStart";
= new (136, 22);
= 2;
= "";
+= new (this.txtStart_TextChanged);
//
// txtEnd
//
= new ("Tahoma", 9F, , , (()(0)));
= new (72, 80);
= "txtEnd";
= new (136, 22);
= 3;
= "";
+= new (this.txtEnd_TextChanged);
//
// label1
//
this. = new ("Tahoma", 9F, , , (()(0)));
this. = new (8, 16);
this. = "label1";
this. = new (64, 23);
this. = 4;
this. = "Host Address";
//
// label2
//
this. = new ("Tahoma", 9F, , , (()(0)));
this. = new (8, 80);
this. = "label2";
this. = new (64, 23);
this. = 5;
this. = "End Port";
//
// label3
//
this. = new ("Tahoma", 9F, , , (()(0)));
this. = new (8, 48);
this. = "label3";
this. = new (64, 23);
this. = 6;
this. = "Start Port";
//
// splitter1
//
this. = ;
this. = new (221, 0);
this. = "splitter1";
this. = ;
this. = new (3, 273);
this. = 7;
this. = false;
//
// btnScan
//
= new ("Tahoma", 9F, , , (()(0)));
= new (72, 200);
= "btnScan";
= 8;
= "scanning";
+= new (this.btnScan_Click);
//
// progressBar1
//
this. = new (8, 112);
this. = "progressBar1";
this. = new (200, 23);
this. = 1;
this. = 9;
//
// lblStart
//
= new ("Tahoma", 9F, , , (()(0)));
= new (8, 144);
= "lblStart";
= new (48, 23);
= 10;
//
// lblStop
//
= new ("Tahoma", 9F, , , (()(0)));
= new (160, 144);
= "lblStop";
= new (48, 23);
= 11;
//
// lblNow
//
= new ("Tahoma", 9F, , , (()(0)));
= new (84, 144);
= "lblNow";
= new (48, 23);
= 12;
= new (6, 15);
= new (488, 273);
();
();
();
(this.progressBar1);
();
(this.splitter1);
(this.label3);
(this.label2);
(this.label1);
();
();
();
();
= new ("Tahoma", 9F, , , (()(0)));
= "Form1";
= "Port Scanner";
(false);
}
[STAThread]
static void Main()
{
(new Form1());
}
private void btnScan_Click(object sender, e)
{
//Create a thread and create a ThreadStart delegate object Thread process = new Thread(new ThreadStart(PortScan));
();
//Show the range of port scan = ();
= ();
//Initialization of display box ();
("Port Scanner v1.0.");
("");
}
private void PortScan()
{
start = ();
end = ();
//Check the legality of the input range if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
{
("Start scanning... (You may need to wait a few minutes)");
Addr = ;
for (int i = start; i <= end; i++)
{
port = i;
//Scan thread using this port scanThread = new Thread(new ThreadStart(Scan));
();
//Make the thread sleep (100);
= i;
= ();
}
//Incomplete situation while (!OK)
{
OK = true;
for (int i = start; i <= end; i++)
{
if (!done[i])
{
OK = false;
break;
}
}
(1000);
}
("Scan ends!");
}
else
{
("Input error, port range is [0-65536]");
}
}
private void Scan()
{
int portnow = port;
//Create thread variable Thread Threadnow = scanThread;
done[portnow] = true;
//Create TcpClient object, TcpClient is used to provide client connections to TCP network services TcpClient objTCP = null;
//Scan the port and write information if it is successful try
{
//Scan the port with the TcpClient object objTCP = new TcpClient(Addr, portnow);
("Port" + () + "Open!");
}
catch
{
}
}
private void txtStart_TextChanged(object sender, e)
{
//Get the input start port value = ;
}
private void txtEnd_TextChanged(object sender, e)
{
//Get the input accept port value = ;
}
}
}