CODEWITHSUNDEEP
c#socketstcpports
Tango_Chaser
Tango_Chaser

Reputation: 331

C#: How to find an available port in a range of specific ports in TCP?

How do I find start listening to a port in TCP protocol within a specific range?

For an example:

Check the ports from 6001 to 7000 until you find an available one
and start listening to it when found.
when someone else tries the same, he cannot listen to the same port.

Thank you.

Upvotes: 0

Views: 1347

Answers (1)

Tango_Chaser
Tango_Chaser

Reputation: 331

I found a way to perform that:

private static int initialPort = 6001; // initial port to search from

public static void StartServerTCP()
{
    bool serverSet = false;
    while (!serverSet && initialPort <= 7000)
    {
        try
        {
            Console.WriteLine(Dns.GetHostName() + ": (Server:TCP) Trying to setup server at port: {0} [TCP]", initialPort);

            serverSocket.Bind(new IPEndPoint(GetIP(), initialPort));
            serverSocket.Listen(0);
            serverSocket.BeginAccept(AcceptCallback, null);
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine(Dns.GetHostName() + ": (Server:TCP) Server setup completed at port {0} [TCP]\n", initialPort);
            Console.ForegroundColor = ConsoleColor.Gray;
            serverSet = true;
        }
        catch (Exception)
        {
            Console.WriteLine("\n" + Dns.GetHostName() + ": (Server:TCP) Port <{0}> is busy, trying a different one\n", initialPort);
            initialPort++;
        }
    }
}

Upvotes: 2

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