How to open a port using requests to the router in C#?

Question

C++ / C#

I'm trying to implement the code from this article . The essence of the article is that with the help of xml requests we tell the router to open the port, if I understand everything correctly.
1. In the first empty GET request, we receive a response from the router under the spoiler.

Tyk

<?xml version="1.0"?>
<root xmlns="urn:schemas-upnp-org:device-1-0">
  <specVersion>
    <major>1</major>
    <minor>0</minor>
  </specVersion>
  <device>
    <deviceType>urn:schemas-upnp-org:device:InternetGatewayDevice:1</deviceType>
    <friendlyName>Wireless-N Broadband Router</friendlyName>
    <manufacturer>Tenda</manufacturer>
    <manufacturerURL>http://www.tendacn.com</manufacturerURL>
    <modelDescription>Wireless-N Broadband Router</modelDescription>
    <modelName>Wireless-N Router</modelName>
    <modelNumber>Wireless-N Router</modelNumber>
    <serialNumber>0000001</serialNumber>
    <modelURL>http://www.tendacn.com</modelURL>
    <UDN>uuid:afb59702-73a3-5487-6792-b438566e61b7</UDN>
    <serviceList>
      <service>
        <serviceType>urn:schemas-upnp-org:service:Layer3Forwarding:1</serviceType>
        <serviceId>urn:upnp-org:serviceId:L3Forwarding1</serviceId>
        <SCPDURL>/x_layer3forwarding.xml</SCPDURL>
        <controlURL>/control?Layer3Forwarding</controlURL>
        <eventSubURL>/event?Layer3Forwarding</eventSubURL>
      </service>
    </serviceList>
    <deviceList>
      <device>
        <deviceType>urn:schemas-upnp-org:device:WANDevice:1</deviceType>
        <friendlyName>Wireless-N Broadband Router</friendlyName>
        <manufacturer>Tenda</manufacturer>
        <manufacturerURL>http://www.tendacn.com</manufacturerURL>
        <modelDescription>Wireless-N Broadband Router</modelDescription>
        <modelName>Wireless-N Router</modelName>
        <modelURL>http://www.tendacn.com</modelURL>
        <UDN>uuid:a1409738-e191-138b-16f3-c4d182f31616</UDN>
        <serviceList>
          <service>
            <serviceType>urn:schemas-upnp-org:service:WANCommonInterfaceConfig:1</serviceType>
            <serviceId>urn:upnp-org:serviceId:WANCommonIFC1</serviceId>
            <SCPDURL>/x_wancommoninterfaceconfig.xml</SCPDURL>
            <controlURL>/control?WANCommonInterfaceConfig</controlURL>
            <eventSubURL>/event?WANCommonInterfaceConfig</eventSubURL>
          </service>
        </serviceList>
        <deviceList>
          <device>
            <deviceType>urn:schemas-upnp-org:device:WANConnectionDevice:1</deviceType>
            <friendlyName>Wireless-N Broadband Router</friendlyName>
            <manufacturer>Tenda</manufacturer>
            <manufacturerURL>http://www.tendacn.com</manufacturerURL>
            <modelDescription>Wireless-N Broadband Router</modelDescription>
            <modelName>Wireless-N Router</modelName>
            <modelURL>http://www.tendacn.com</modelURL>
            <UDN>uuid:de95db7d-392a-70a4-0e74-caf2aa770a22</UDN>
            <serviceList>
              <service>
                <serviceType>urn:schemas-upnp-org:service:WANIPConnection:1</serviceType>
                <serviceId>urn:upnp-org:serviceId:WANIPConn1</serviceId>
                <SCPDURL>/x_wanipconnection.xml</SCPDURL>
                <controlURL>/control?WANIPConnection</controlURL>
                <eventSubURL>/event?WANIPConnection</eventSubURL>
              </service>
            </serviceList>
          </device>
        </deviceList>
      </device>
    </deviceList>
    <presentationURL>http://192.168.0.1</presentationURL>
  </device>
</root>

The article goes on to say that you need to take the controlURL string, next to which the serviceType is equal to urn:schemas-upnp-org:service:WANIPConnection:1. In my case, it is 2. Now we send a POST request to 192.168.0.1:1980/control with a request to open the port. The code of my request is under the spoiler.
<controlURL>/control?WANIPConnection</controlURL>

Tyk

public static void AddPort(string webPath, int port, string protocol, string locIP, string desc)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(webPath);
            HttpWebResponse response;
            string query, responseStr;
            byte[] data;

            request.Method = "POST";
            request.Headers.Add("Cache-Control", "no-cache");
            request.Headers.Add("Pragma", "no-cache");
            request.Headers.Add("SOAPAction", "\"urn:schemas-upnp-org:service:WANIPConnection:1#AddPortMapping\"");
            request.ContentType = "text/xml; charset=\"utf-8\"";
            request.UserAgent = "Microsoft-Windows/6.1 UPnP/1.0";
            query = "<?xml version=\"1.0\"?>" +
                "<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">" +
                "<SOAP-ENV:Body><m:AddPortMapping xmlns:m=\"urn:schemas-upnp-org:service:WANIPConnection:1\">" +
                "<NewRemoteHost xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\"></NewRemoteHost>" +
                "<NewExternalPort xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui2\">" + port + "</NewExternalPort>" +
                "<NewProtocol xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\">" + protocol + "</NewProtocol>" +
                "<NewInternalPort xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui2\">" + port + "</NewInternalPort>" +
                "<NewInternalClient xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\">" + locIP + "</NewInternalClient>" +
                "<NewEnabled xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"boolean\">1</NewEnabled>" +
                "<NewPortMappingDescription xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"string\">" + desc + "</NewPortMappingDescription>" +
                "<NewLeaseDuration xmlns:dt=\"urn:schemas-microsoft-com:datatypes\" dt:dt=\"ui4\">0</NewLeaseDuration></m:AddPortMapping>" +
                "</SOAP-ENV:Body></SOAP-ENV:Envelope>";
            data = Encoding.UTF8.GetBytes(query);
            request.ContentLength = data.Length;
            
            using (Stream stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            responseStr = String.Empty;
            response = (HttpWebResponse)request.GetResponse();

            using (StreamReader sr = new StreamReader(response.GetResponseStream()))
            {
                responseStr = sr.ReadToEnd();
            }

            Console.WriteLine(responseStr);
        }

The problem is this: when sending this request, the WebExceptionon simply crashes with the text "The server committed a protocol violation. Section=ResponseStatusLine" on the line. Do you have any idea
response = (HttpWebResponse)request.GetResponse();
why this is and how to fix it (and open the port)?

Answer 1

You need header with log/pass