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From "" <>
Subject Adding TERMINAL-TYPE option to TelnetClient
Date Mon, 10 Mar 2003 15:05:24 GMT

In order to fix a problem while connecting to an OpenVMS server (delay of the OpenVMS login
process when the terminal type is unknown) I added support of the TERMINAL-TYPE telnet option,
RFC 1091 to the TelnetClient class of the Commons Net library (

A brief description of the modification I had to make for the added capability follows:

- The state machine implemented in TelnetInputStream has been extended to support option subnegotiation
(can be reused for implementing support for more option requiring subnegotiation)
- The Telnet base class has been extended to drive the subnegotiation sending the terminal
type to the other telnet party when requested
- A new constructor has been added to the TelnetClient class, which accepts a String specifying
the terminal type (the default terminal type is "VT100", which is took when using the empty

I think this functionality could potentially be interesting for other users of the library,
so I would like to propose that the updated sources be included in the Jakarta code base.

Also, I think that the support for subnegotiating options can be reused for implementing support
for other telnet options. I think that the best way to do this could be defining a java interface
for managing options and letting users of the library define their own class for managing

Any comment will be greatly appreciated.
Bruno D'Avanzo

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