C# iPhone push server?

Question

Im attempting to write a push server for the iPhone in C#. I have the following code:

        // Create a TCP/IP client socket.
        using (TcpClient client = new TcpClient())
        {
            client.Connect("gateway.sandbox.push.apple.com", 2195);
            using (NetworkStream networkStream = client.GetStream())
            {
                Console.WriteLine("Client connected.");

                X509Certificate clientCertificate = new X509Certificate(@"certfile.p12", passwordHere);
                X509CertificateCollection clientCertificateCollection = new X509CertificateCollection(new X509Certificate[1] { clientCertificate });

                // Create an SSL stream that will close the client's stream.
                SslStream sslStream = new SslStream(
                    client.GetStream(),
                    false,
                    new RemoteCertificateValidationCallback(ValidateServerCertificate),
                    null
                    );

                try
                {
                    sslStream.AuthenticateAsClient("gateway.sandbox.push.apple.com");
                }
                catch (AuthenticationException e)
                {
                    Console.WriteLine("Exception: {0}", e.Message);
                    if (e.InnerException != null)
                    {
                        Console.WriteLine("Inner exception: {0}", e.InnerException.Message);
                    }
                    Console.WriteLine("Authentication failed - closing the connection.");
                    client.Close();
                    return;
                }
            }

ect....

Only I keep receiving a exception: "A call to SSPI failed, see Inner exception" Inner Exception -> "The message received was unexpected or badly formatted."

Does anyone have any idea whats going wrong here?

Solution 1

Figured it out. Replaced sslStream.AuthenticateAsClient("gateway.sandbox.push.apple.com"); with sslStream.AuthenticateAsClient("gateway.sandbox.push.apple.com", clientCertificateCollection, SslProtocols.Default, false); And registered the certificates on the PC.

Edit: Here is the code for creating a payload as requested:

    private static byte[] GeneratePayload(byte [] deviceToken, string message, string sound)
    {
        MemoryStream memoryStream = new MemoryStream();

        // Command
        memoryStream.WriteByte(0);

        byte[] tokenLength = BitConverter.GetBytes((Int16)32);
        Array.Reverse(tokenLength);
        // device token length
        memoryStream.Write(tokenLength, 0, 2);

        // Token
        memoryStream.Write(deviceToken, 0, 32);

        // String length
        string apnMessage = string.Format ( "{{\"aps\":{{\"alert\":{{\"body\":\"{0}\",\"action-loc-key\":null}},\"sound\":\"{1}\"}}}}",
            message,
            sound);

        byte [] apnMessageLength = BitConverter.GetBytes((Int16)apnMessage.Length);
        Array.Reverse ( apnMessageLength );
        // message length
        memoryStream.Write(apnMessageLength, 0, 2);

        // Write the message
        memoryStream.Write(System.Text.ASCIIEncoding.ASCII.GetBytes(apnMessage), 0, apnMessage.Length);

        return memoryStream.ToArray();
    } // End of GeneratePayload

Solution 2

From Zenox's comment: use a different version of AuthenticateAsClient

sslStream.AuthenticateAsClient("gateway.sandbox.push.apple.com", clientCertificateCollection, SslProtocols.Default, false);

Solution 3

Other way is just to use X509Certificate2 and X509CertificateCollection2 classes.

Solution 4

I recently used Growl For Windows to push messages to the Prowl client on the IPhone from .Net code. So you might get your functionatlity without writing a push server yourself.

View more solutions

Comments

[Kyle]

That may work for pushing data to the apn, but what about handling the feedback though?

[Akash Kava]

What folder (Certificate Store) should I use to import to on Windows Server? Is it Personal or Trusted Publisher? I tried "Default select based on certificate type" but didnt work.