C#•16mo ago

❔ port scanner for game servers?

Hello, currently working on a program and one of its core functionalities is to scan the local network for game servers on a specific port (Rust, 28015), however after I have attempted to achieve this, it appears to not work. It seems to be stuck "searching" to no avail and doesnt show any results even though im hosting a server on another local machine with the required port. perhaps ive made an error in my method? Any help appreciated.

4 Replies

JarskiOP•16mo ago

        private async Task PerformNetworkScanAsync()
        {
            await Task.Run(() =>
            {
                string localIpAddress = GetLocalIpAddress();
                if (!string.IsNullOrEmpty(localIpAddress))
                {
                    ScanNetworkForRustServers(localIpAddress);
                }
            });
        }

        private string GetLocalIpAddress()
        {
            string hostName = Dns.GetHostName();
            IPHostEntry hostEntry = Dns.GetHostEntry(hostName);
            foreach (IPAddress ipAddress in hostEntry.AddressList)
            {
                if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
                {
                    return ipAddress.ToString();
                }
            }
            return null;
        }

        private void ScanNetworkForRustServers(string localIpAddress)
        {
            string[] ipSegments = localIpAddress.Split('.');
            if (ipSegments.Length != 4)
            {
                resultsListBox.Items.Add("Invalid local IP format.");
                return;
            }

            string baseIpAddress = $"{ipSegments[0]}.{ipSegments[1]}.{ipSegments[2]}";

            for (int i = 1; i <= 255; i++)
            {
                string ipAddress = $"{baseIpAddress}.{i}";
                if (CheckPort(ipAddress, 28015))
                {
                    resultsListBox.Items.Add($"Server found: {ipAddress}:28015");
                }
            }
        }

        private bool CheckPort(string ipAddress, int port)
        {
            using (TcpClient tcpClient = new TcpClient())
            {
                try
                {
                    tcpClient.Connect(ipAddress, port);
                    return true; // Port is open
                }
                catch (SocketException)
                {
                    return false; // Port is closed
                }
            }
        }

        private async Task PerformNetworkScanAsync()
        {
            await Task.Run(() =>
            {
                string localIpAddress = GetLocalIpAddress();
                if (!string.IsNullOrEmpty(localIpAddress))
                {
                    ScanNetworkForRustServers(localIpAddress);
                }
            });
        }

        private string GetLocalIpAddress()
        {
            string hostName = Dns.GetHostName();
            IPHostEntry hostEntry = Dns.GetHostEntry(hostName);
            foreach (IPAddress ipAddress in hostEntry.AddressList)
            {
                if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
                {
                    return ipAddress.ToString();
                }
            }
            return null;
        }

        private void ScanNetworkForRustServers(string localIpAddress)
        {
            string[] ipSegments = localIpAddress.Split('.');
            if (ipSegments.Length != 4)
            {
                resultsListBox.Items.Add("Invalid local IP format.");
                return;
            }

            string baseIpAddress = $"{ipSegments[0]}.{ipSegments[1]}.{ipSegments[2]}";

            for (int i = 1; i <= 255; i++)
            {
                string ipAddress = $"{baseIpAddress}.{i}";
                if (CheckPort(ipAddress, 28015))
                {
                    resultsListBox.Items.Add($"Server found: {ipAddress}:28015");
                }
            }
        }

        private bool CheckPort(string ipAddress, int port)
        {
            using (TcpClient tcpClient = new TcpClient())
            {
                try
                {
                    tcpClient.Connect(ipAddress, port);
                    return true; // Port is open
                }
                catch (SocketException)
                {
                    return false; // Port is closed
                }
            }
        }

cap5lut•16mo ago

seems like u r using the wrong protocol, when i look at the port config description from https://developer.valvesoftware.com/wiki/Rust_Dedicated_Server

+server.port 28015 Sets the port the server will use. (default 28015 UDP)

Rust Dedicated Server

JarskiOP•16mo ago

Ah. I need udp. Not tcp. Will take a look

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ port scanner for game servers?