Picky Tcp Listener
/*
C# Network Programming
by Richard Blum
Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Security;
using System.Security.Permissions;
using System.Text;
[SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",
Port="9050", Transport="All")]
[SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",
Port="9051", Transport="All")]
[SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",
Port="9052", Transport="All")]
public class PickyTcpListener
{
public static void Main()
{
int recv;
TcpListener newsock = null;
byte[] data = new byte[1024];
Console.Write("Enter port number to use: ");
string stringPort = Console.ReadLine();
int port = Convert.ToInt32(stringPort);
try
{
newsock = new TcpListener(port);
newsock.Start();
} catch (SecurityException)
{
Console.WriteLine("Sorry, that port is unavailable");
return;
}
Console.WriteLine("Waiting for a client...");
TcpClient client = newsock.AcceptTcpClient();
NetworkStream ns = client.GetStream();
string welcome = "Welcome to my test server";
data = Encoding.ASCII.GetBytes(welcome);
ns.Write(data, 0, data.Length);
while(true)
{
data = new byte[1024];
recv = ns.Read(data, 0, data.Length);
if (recv == 0)
break;
Console.WriteLine(
Encoding.ASCII.GetString(data, 0, recv));
ns.Write(data, 0, recv);
}
ns.Close();
client.Close();
newsock.Stop();
}
}
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