[asterisk-bugs] [Asterisk 0017506]: MSG_OOB flag on HANGUP packet misused

[Asterisk Bug Tracker]

The following issue has been SUBMITTED. 
====================================================================== 
https://issues.asterisk.org/view.php?id=17506 
====================================================================== 
Reported By:                brycebaril
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   17506
Category:                   Resources/res_agi
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           Older 1.6.2 - please test a newer version 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
====================================================================== 
Date Submitted:             2010-06-14 15:51 CDT
Last Modified:              2010-06-14 15:51 CDT
====================================================================== 
Summary:                    MSG_OOB flag on HANGUP packet misused
Description: 
When using fast AGI and the AGISIGHUP flag is enabled, Asterisk sends an
Out-of-Band "HANGUP\n" packet when the channel is terminated.  It uses the
MSG_OOB flag to send it URG/Out-of-Band via TCP.

This TCP feature is generally not used and not reliable (e.g.
http://en.wikipedia.org/wiki/Transmission_Control_Protocol#Out_of_band_data
) and in this case will cause only the "\n" character to be sent OOB.  The
"HANGUP" is still sent in-band, and can cause buffering issues --
especially with the "\n" being sent in a different band.  

Even if the developer sets socket options to get the OOB data in-band, the
"\n" will come in prior to the "HANGUP" because it is a higher priority.

I suggest dropping the "MSG_OOB" flag from this packet, as it doesn't seem
to do any good, and possibly only does harm.
====================================================================== 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2010-06-14 15:51 brycebaril     New Issue                                    
2010-06-14 15:51 brycebaril     Asterisk Version          => Older 1.6.2 -
please test a newer version
2010-06-14 15:51 brycebaril     Regression                => No              
2010-06-14 15:51 brycebaril     SVN Branch (only for SVN checkouts, not tarball
releases) => N/A             
======================================================================