holograph opened a new pull request #271:
URL: https://github.com/apache/guacamole-server/pull/271


   The can easily be tested by sending a well-formed `select` command using a 
`$`-prefixed, but fake, connection ID.
   
   Before patch:
   ```
   tomer@druuge:~/dev/guacamole-server$ echo '6.select,10.$123456789;' | nc 
localhost 4822
   tomer@druuge:~/dev/guacamole-server$ 
   ```
   
   Note complete lack of response above, the server simply drops the 
connection. Contrast with the same command after the patch:
   
   ```
   tomer@druuge:~/dev/guacamole-server$ echo '6.select,10.$123456789;' | nc 
localhost 4822
   5.error,38.Connection "$123456789" does not exist,3.768;
   tomer@druuge:~/dev/guacamole-server$ 
   ```
   


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