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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HTTPCORE-196) Long receive time for chunked ssl response
Date Thu, 14 May 2009 09:12:45 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Oleg Kalnichevski updated HTTPCORE-196:

    Attachment: httpcore-196.patch

There are test cases for chunk coded messages transmitted over SSL encrypted connections in
the HttpCore NIO test suite. So, I am not sure this issue is easily reproducible. I suspect
this may be a fairly uncommon fringe case. Therefore, it would be helpful to understand the
problem a bit better. Could you please provide me with some details regarding the server side
setup: OS, web server, SSL library used? 

Anyways, please try out the attached patch and let me know if it fixes the problem for you.
Please note the patch is against SVN trunk, so you will have to pull the latest code from
the SVN repository, apply the patch and compile the source.


> Long receive time for chunked ssl response
> ------------------------------------------
>                 Key: HTTPCORE-196
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-196
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.0
>         Environment: MacOSX (Leopard) / Tomcat / Eclipse
>            Reporter: Scott Willey
>             Fix For: 4.1
>         Attachments: httpcore-196.patch
> Processing a chunked SSL response of 221 characters, I found I was waiting over three
seconds for the entire response to be read. Upon investigation, this appears to be happening
because the decrypt method in SSLIOSession does not decrypt everything in the encrypted buffer
at one go. Because of this, portions of my response didn't get processed via the processing
of the events, but rather via the BaseIOReactor's validate method which means I experienced
multiple select interval timeouts prior to the message being fully processed. In reviewing
the java nio documentation for the unwrap method of the sslEngine, the comments in the javadoc
state: "This method will attempt to consume one complete SSL/TLS network packet". It appears
that one time through the decrypt method decrypted small packets with almost no data in them,
leaving encrypted data waiting. As an experiment, I changed the code in isAppInputReady in
SSLIOSession to call decrypt in a loop until everything in the en
> crypted buffer was processed and bingo the response processed in under 5ms.
> Unfortunately, I do not have a "sharable" test case as the server side for this case
is inside a corporate filrewall. In theory this should be reproducable with any server over
an SSL connection getting a chunked response. 
> I have a current "patch" for this issue as follows in SSLIOSession.isAppInputReady, but
I will feel much more comfortable with and "official" patch
>     public synchronized boolean isAppInputReady() throws IOException {
>         int bytesRead = receiveEncryptedData();
>         if (bytesRead == -1) {
>           //changed per https://issues.apache.org/jira/browse/HTTPCORE-193
>           // this.status = CLOSED;
>           this.endOfStream = true;
>           //end change
>         }
>         doHandshake();
>         //MODIFICATION
>         //Doing a single decrypt call does not always completely decrypt available 
>         //data (data read above in receiveEncryptedData). The documentation for
>         //sslEngine states that the unwrap method (used in decrypt method)
>         //
>         //  "This method will attempt to consume one complete SSL/TLS network packet"
>         //
>         //Presumedly, when there are multiple network packets, we only decode one
>         //at a time, so multiple calls to decrypt may be necessary to decrypt all
>         //we have. If we do not, we will not process all data available and we
>         //will fail to process incoming responses in a timely way. This may cause
>         //data to be processed only during calls to validation at the reactor level,
>         //which is done once every selectInterval (default value: 1 sec)
>         //original
>         //decryptData();
>         //change:
>         int priorPos = 0;
>         while(this.inEncrypted.position() > 0 && this.inEncrypted.position()
!= priorPos){
>           priorPos = this.inEncrypted.position();
>           decryptData();
>         }
>         // Some decrypted data is available or at the end of stream
>         return this.inPlain.position() > 0 || this.status != ACTIVE;
>     }

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