[asterisk-bugs] [Asterisk 0016032]: AGI returns bogus "510 Invalid or unknown command"

[Asterisk Bug Tracker]

The following issue has been SUBMITTED. 
====================================================================== 
https://issues.asterisk.org/view.php?id=16032 
====================================================================== 
Reported By:                notahat
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   16032
Category:                   Resources/res_agi
Reproducibility:            random
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           SVN 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases):  trunk 
SVN Revision (number only!): 222530 
Request Review:              
====================================================================== 
Date Submitted:             2009-10-06 21:19 CDT
Last Modified:              2009-10-06 21:19 CDT
====================================================================== 
Summary:                    AGI returns bogus "510 Invalid or unknown command"
Description: 
When res_agi.c reads from the AGI stream, it incorrectly calculates the
number of free bytes remaining in the read buffer. In certain circumstances
(such as repeated EAGAIN errors from fgets), this causes it to incorrectly
interpret the buffer as full. That then confuses the code interpreting the
command, leading to a bogus "510 invalid or unknown command" error being
returned.
====================================================================== 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2009-10-06 21:19 notahat        New Issue                                    
2009-10-06 21:19 notahat        Asterisk Version          => SVN             
2009-10-06 21:19 notahat        Regression                => No              
2009-10-06 21:19 notahat        SVN Branch (only for SVN checkouts, not tarball
releases) =>  trunk          
2009-10-06 21:19 notahat        SVN Revision (number only!) => 222530          
======================================================================