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Date: Fri, 30 Jan 2009 06:25:59 -0800 (PST)
From: "Martin Oberhuber (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (NET-89) [net] TelnetClient broken for binary
 transmissions + solution
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    [ https://issues.apache.org/jira/browse/NET-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668881#action_12668881 ] 

Martin Oberhuber commented on NET-89:
-------------------------------------

Can we schedule this for fixing in 1.5 and 2.1 by adding following API:

{code:title=TelnetClient.java|borderStyle=solid}
  /**
   * Enables or disables automatic conversion of input and output streams
   * to or from NetASCII standard format (CRLF).
   * By default, automatic conversion is ON. It should be disabled when direct
   * (binary) access to the data streams is needed. The setting can only
   * be made or changed before the TelnetClient is connected.
   * 
   * @param b <code>false</code> to disable automatic conversion of streams to NetASCII format.
   */
  public void setNetASCIIConversion(boolean b);
{code}


> [net] TelnetClient broken for binary transmissions + solution
> -------------------------------------------------------------
>
>                 Key: NET-89
>                 URL: https://issues.apache.org/jira/browse/NET-89
>             Project: Commons Net
>          Issue Type: Bug
>         Environment: Operating System: All
> Platform: All
>            Reporter: Colin Surprenant
>
> 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.
> Also, in TelnetInoutStream#__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.
> The current code reads:
> case _STATE_IAC:
>     switch (ch)
>     {
>     case TelnetCommand.WILL:
>         __receiveState = _STATE_WILL;
>         continue;
>     case TelnetCommand.WONT:
>         __receiveState = _STATE_WONT;
>         continue;
>     case TelnetCommand.DO:
>         __receiveState = _STATE_DO;
>         continue;
>     case TelnetCommand.DONT:
>         __receiveState = _STATE_DONT;
>         continue;
>     /* TERMINAL-TYPE option (start)*/
>     case TelnetCommand.SB:
>         __suboption_count = 0;
>         __receiveState = _STATE_SB;
>         continue;
>     /* TERMINAL-TYPE option (end)*/
>     case TelnetCommand.IAC:
>         __receiveState = _STATE_DATA;
>         break;
>     default:
>         break;
>     }
>     __receiveState = _STATE_DATA;
>     continue;
> case _STATE_WILL:
> but it should be:
> case _STATE_IAC:
>     switch (ch)
>     {
>     case TelnetCommand.WILL:
>         __receiveState = _STATE_WILL;
>         continue;
>     case TelnetCommand.WONT:
>         __receiveState = _STATE_WONT;
>         continue;
>     case TelnetCommand.DO:
>         __receiveState = _STATE_DO;
>         continue;
>     case TelnetCommand.DONT:
>         __receiveState = _STATE_DONT;
>         continue;
>     /* TERMINAL-TYPE option (start)*/
>     case TelnetCommand.SB:
>         __suboption_count = 0;
>         __receiveState = _STATE_SB;
>         continue;
>     /* TERMINAL-TYPE option (end)*/
>     case TelnetCommand.IAC:
>         __receiveState = _STATE_DATA;
>         break; // exit to enclosing switch to return from read
>     default:
>         __receiveState = _STATE_DATA;           
>         continue; // move on the next char
>     }
>     break; // exit and return from read
> case _STATE_WILL:
> I'll provide patches for this.
> Colin.

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