Date: Wed, 03 Nov 1999 11:32:26 +0100 (CET) From: Michael Ranner <mranner@netway.at> To: (Hellmuth Michaelis) <hm@hcs.de>, freebsd-isdn@freebsd.org Subject: Re: a little bit more from the dump Message-ID: <XFMail.991103113226.mranner@netway.at> In-Reply-To: <19991103081050.DAE2538DF@hcswork.hcs.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On 03-Nov-99 Hellmuth Michaelis wrote:
>>From the keyboard of Gary Jennejohn:
>
> [i4b panics]
>
>> oh my God, it's recursive !
>
> Oh yes, it is. It has to be. And it it one of the more complicated things
> i wrote. It is basically a stripped down ASN.1 parser just able to parse
> AOCD unit charging info based on BER (Basic Encoding Rules for ASN.1).
> See the header of isdntrace/q932_fac.c what type of documentation is
> available on that subject(s).
>
>> The panic is evidently triggered by receipt
>> of AOCD info from the telephone company. The actual length of the packet
>> was 31 bytes (if I read do_component correctly), but at the time of the
>> panic it was up to 134 :-(, way beyond the end of the buffer.
>>
>> I think the only person who even remotely understands this code is Hellmuth,
>> since he wrote it.
>>
>> It might help if you could convince gdb to output in hex rather than
>> octal. That would allow one to check whether the packet contents are
>> reasonable (I don't know, I know nothing at all about what an AOCD
>> packet should contain).
>>
>> You could try not using AOCD in isdnd.rc, I suppose. That might help.
>> But the kernel will probably still try to parse the packets.
>
> Yes, it will. A FACILITY message will be parsed by i4b_aoc() in layer 3
> in any case.
>
> There are two formats for a PTT to send charge information, one is in
> charging units (which is used here in Germany, this might - or will -
> change in the future) and in currency, which is a bit more complex.
>
> AFAIK, in Austria the currency format is used which is not supported
> by i4b (simply because a/ i cannot test it and b/ i don't need it)
> and if the currency format is used, this is probably the cause of the
> problem.
In Austria we can use both variants. Now we have let the PTT change to
the other version and everything is fine. But now I can not debug the
AOCD message with the currency format - sorry but we need the other format also
for our private network for charge accounting and the Gesko Office does not
support the currency format (but does not crash ;)
cu
/\/\ichael Ranner - Michael Ranner <mranner@netway.at>
Michael.Ranner@netway.at - webmaster@mariazell.org
----------------------------------------------------------------------
Homepage: http://www.netlounge.at/mranner/
Mariazell Online: http://www.mariazell.at/
----------------------------------------------------------------------
Vote for ME -- I'm well-tapered, half-cocked, ill-conceived and
TAX-DEFERRED!
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-isdn" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?XFMail.991103113226.mranner>