CODEWITHSUNDEEP
javasocketsssljava-8
thelostmachine
thelostmachine

Reputation: 89

How can I confirm a handshake was completed with SSL Sockets in Java?

Here's some pseudocode

Client:
    boolean sent = false;
    byte[] message = new String("test").getBytes();

    send()
    {
        sent = sslSocket.sendMessage(message);

        if (sent)
            sslSocket.close();
    }

I'm writing tests that should be fairly quick. Once the Client successfully sends a message, it should close immediately. In my tests, the Client returns sent == true, so the socket closes. However, the Server is throwing a received close_notify during handshake exception. This exception does not happen when I use Thread.sleep(200) right before closing the Client.

Our sockets are our own abstractions and wrappers for Java's sockets. From this post, I have to assume that the Server has not completed the handshake, but the Client has? Why else would sent return true? I can't confirm that the message actually HAS been received by the Server, however, because the exception is thrown immediately. I only have Client sent boolean to rely on.

So my question is how can I confirm the handshake was completed?

Thank you for the help, and sorry for any ambiguity! I can clear any confusions!

Upvotes: 0

Views: 319

Answers (1)

thelostmachine
thelostmachine

Reputation: 89

@Mark brought up a good point about the sendMessage() method. I looked into it more, and it doesn't return true when the message has been sent, but returns when the message has been placed on an output queue. So it turns out the message probably was never actually sent. Documentation was incorrect.

Thus, the handshake was never actually complete and sent was a lie because the connection was never fully open.

Thank you @Mark!

Upvotes: 1

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