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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SSHD-133) E command not handled for single file upload
Date Fri, 01 Jul 2011 12:38:30 GMT

     [ https://issues.apache.org/jira/browse/SSHD-133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Guillaume Nodet resolved SSHD-133.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.6.0
         Assignee: Guillaume Nodet

> E command not handled for single file upload
> --------------------------------------------
>
>                 Key: SSHD-133
>                 URL: https://issues.apache.org/jira/browse/SSHD-133
>             Project: MINA SSHD
>          Issue Type: Bug
>            Reporter: Chris Lowe
>            Assignee: Guillaume Nodet
>             Fix For: 0.6.0
>
>
> Using the Ganymed SSH2 client (build 210 from here http://www.ganymed.ethz.ch/ssh2/)
uploading a file to an instance of Mina SSHD causes the following exception:
> java.io.IOException: Expected a C message but got 'E'
> 	at org.apache.sshd.server.command.ScpCommand.writeFile(ScpCommand.java:299)
> 	at org.apache.sshd.server.command.ScpCommand.run(ScpCommand.java:174)
> 	at java.lang.Thread.run(Thread.java:662)
> Further investigation into the issue reveals that the Ganymed client ends the C command
sequence with an E command.  Looking at the code for ScpCommand run() method I notice the
following switch statement:
>                     switch (c)
>                     {
>                         case -1:
>                             return;
>                         case 'D':
>                             isDir = true;
>                         case 'C':
>                         case 'E':
>                             line = ((char) c) + readLine();
>                             break;
>                         default:
>                             //a real ack that has been acted upon already
>                             continue;
>                     }
> The E command is part of the fall through for C and D command where the respective handlers
for these commands assert that a command is either a C or D.  If either of these handlers
receive an E then an exception is raised.
> Changing the switch statement to prevent the E from reaching the writeFile or writeDir
as follows remedies the issue for me:
>                     switch (c)
>                     {
>                         case -1:
>                             return;
>                         case 'D':
>                             isDir = true;
>                         case 'C':
>                             line = ((char) c) + readLine();
>                             break;
>                         case 'E':
>                             readLine(); // consume remainder of line
>                             return;
>                         default:
>                             //a real ack that has been acted upon already
>                             continue;
>                     }
> I'm using a version compiled from the current SVN head revision 1132372

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