[Asterisk-bsd] NetBSD: Bad UDP checksum?

[Dr. Rich Murphey]

Linux uses EAGAIN to indicate UDP checksum errors.

One of the meanings of EAGAIN on *BSD is... reading a socket returns 
EAGAIN to indicate that the system call was interrupted.  That/s the 
clearest case where it could be immediately invoked again and possibly 
return some data.  

But is more likely that the socket is set for non-blocking IO and the 
read call is returnin EAGAIN to indicate that no data was available.

In most of the cases, where the read is in a loop, a solution is to 
#ifdef out the error message on *BSD.

#if ! defined(BSD)
		/* On *BSD EAGAIN indicates an interrupted system call that can be retried */
		ast_log(LOG_NOTICE, "RTP: Received packet with bad
UDP checksum\n");
#endif


I believe that the error message is the only issue here, so as far as I 
can see that should be sufficient.  The remaining code that looks at 
EAGAIN has already been ported and is doing the right thing as far as I 
can see.

Point me to the specific patch or file if you need more info!

Cheers,
Rich



Jay Adelson wrote:

>I've been able to repeat this problem easily... 
>
>Rich, are you familiar enough with the patch you could translate it into
>English for me?
>
>Thanks.
>
>-j
>
>On Wed, Nov 03, 2004 at 09:25:16AM +0000, Chris Stenton wrote:
>  
>
>>On Tue, 2004-11-02 at 21:00, Alexander Timoshenko wrote:
>>    
>>
>>>Jay Adelson (jay at adelson.org) wrote:
>>>      
>>>
>>>>I've noticed that when I check voicemail, for example, I will get 
>>>>a quickly repeating error on the CLI:
>>>>
>>>>Nov  2 12:50:08 NOTICE[2573]: rtp.c:439 ast_rtp_read: RTP: Received packet with bad UDP checksum
>>>>
>>>>This repeats hundreds of times until the message from the voicemail 
>>>>terminates.
>>>>
>>>>Anyone seen this?
>>>>        
>>>>
>>>    It is wrong handling of EAGAIN return code. Check asterisk-dev archives 
>>>for today to get more info. 
>>>      
>>>
>>I thought Rich put a patch in for this back in July. I am not seeing any
>>problem under FreeBSD but I have not updated for a few days.
>>
>>Chris
>>
>>
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