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From "Samant Maharaj (JIRA)" <server-...@james.apache.org>
Subject [jira] [Updated] (JAMES-1436) APPEND IMAP command can result in JAMES IMAP waiting indefinitely for data
Date Tue, 11 Sep 2012 21:54:08 GMT

     [ https://issues.apache.org/jira/browse/JAMES-1436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Samant Maharaj updated JAMES-1436:
----------------------------------

    Description: 
When processing an IMAP APPEND command, the Netty stack in JAMES IMAP can get into a state
where the ImapRequestFrameDecoder will wait for a number message bytes that will never arrive.

This has the effect of causing the IMAP client to also block indefinitely waiting for a response
from the server.

h4. Root Cause:
This is due to the DelimiterBasedFrameDecoder being removed from the Netty pipeline by the
ImapRequestFrameDecoder.

If the DelimiterBasedFrameDecoder still contains less than one line of data in its buffer,
that data will never be flushed and forwarded down the pipeline. The effect of this is that
a small number of bytes, typically from the early part of the message are omitted and the
final byte count does not match the value calculated from the APPEND command. This results
in the APPEND command never being completely decoded and hence no append actually takes place
nor does a response get sent to the client.

In order to trigger this bug, 

  was:
When processing an IMAP APPEND command, the Netty stack in JAMES IMAP can get into a state
where the ImapRequestFrameDecoder will wait for a number message bytes that will never arrive.

This has the effect of causing the IMAP client to also block indefinitely waiting for a response
from the server.

Root Cause:
This is due to the DelimiterBasedFrameDecoder being removed from the Netty pipeline by the
ImapRequestFrameDecoder.

If the DelimiterBasedFrameDecoder still contains less than one line of data in its buffer,
that data will never be flushed and forwarded down the pipeline. The effect of this is that
a small number of bytes, typically from the early part of the message are omitted and the
final byte count does not match the value calculated from the APPEND command. This results
in the APPEND command never being completely decoded and hence no append actually takes place
nor does a response get sent to the client.

    
> APPEND IMAP command can result in JAMES IMAP waiting indefinitely for data
> --------------------------------------------------------------------------
>
>                 Key: JAMES-1436
>                 URL: https://issues.apache.org/jira/browse/JAMES-1436
>             Project: JAMES Server
>          Issue Type: Bug
>          Components: IMAPServer
>    Affects Versions: 3.0-beta4
>         Environment: Ubuntu 12.04 x86_64
>            Reporter: Samant Maharaj
>
> When processing an IMAP APPEND command, the Netty stack in JAMES IMAP can get into a
state where the ImapRequestFrameDecoder will wait for a number message bytes that will never
arrive.
> This has the effect of causing the IMAP client to also block indefinitely waiting for
a response from the server.
> h4. Root Cause:
> This is due to the DelimiterBasedFrameDecoder being removed from the Netty pipeline by
the ImapRequestFrameDecoder.
> If the DelimiterBasedFrameDecoder still contains less than one line of data in its buffer,
that data will never be flushed and forwarded down the pipeline. The effect of this is that
a small number of bytes, typically from the early part of the message are omitted and the
final byte count does not match the value calculated from the APPEND command. This results
in the APPEND command never being completely decoded and hence no append actually takes place
nor does a response get sent to the client.
> In order to trigger this bug, 

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