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From "Sebb (JIRA)" <>
Subject [jira] [Resolved] (NET-89) [net] TelnetClient broken for binary transmissions + solution
Date Tue, 22 Mar 2011 17:17:06 GMT


Sebb resolved NET-89.

       Resolution: Fixed
    Fix Version/s: 3.0

> [net] TelnetClient broken for binary transmissions + solution
> -------------------------------------------------------------
>                 Key: NET-89
>                 URL:
>             Project: Commons Net
>          Issue Type: Bug
>          Components: Telnet
>         Environment: Operating System: All
> Platform: All
>            Reporter: Colin Surprenant
>             Fix For: 3.0
> TelnetClient does not handle correctly binary transmissions in two places:
> First in TelnetClient#_connectAction_() the telnet input and output streams are
> wrapped in the NetASCII streams to handle net vs platform line separator
> conversion which breaks the binary data. My quick solution was to simply remove
> those two wrapping streams. A more general solution might be to provide access
> to the unfilterer stream with methods like getUnfilteredInputStream and
> getUnfilteredOutputStream or to dynamically stop the NetASCII stream from
> 'corrupting' the stream when a TelnetOption.BINARY option is negotiated.
> {quote}
> Also, in TelnetInputStream#__read() there is a bug in the __receiveState
> handling for the _STATE_IAC state. When a second consecutive IAC (0x255) is
> received to encode the single 0x255 character, read does not return 0x255 but
> instead move on to reading the next char in the stream.
> ...
> {quote}
> The above bug report has been moved to the subtask NET-329
> I'll provide patches for this.
> Colin.

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