CODEWITHSUNDEEP
javasocketstelnet
Matt
Matt

Reputation: 11317

How do I send telnet option codes?

I've written a socket listener in Java that just sends some data to the client.

If I connect to the server using telnet, I want the server to send some telnet option codes. Do I just send these like normal messages?

Like, if I wanted the client to print "hello", I would do this:

PrintWriter out = new PrintWriter(clientSocket.getOutputStream());
out.print("hello");
out.flush();

But when I try to send option codes, the client just prints them. Eg, the IAC char (0xff) just gets printed as a strange y character when I do this:

PrintWriter out = new PrintWriter(clientSocket.getOutputStream());
out.print((char)0xff);
out.flush();

Upvotes: 0

Views: 759

Answers (2)

eater
eater

Reputation: 2817

I just answered that here

Upvotes: 2

Peter Lawrey
Peter Lawrey

Reputation: 533472

If you use the default character encoding I would expect 0xff to be turned into two characters.

I suggest you use the plain OutputStream without a PrintWriter. That way the bytes will be sent without translation.

Upvotes: 2

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