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[helmut.kuper at ewetel.de]

Hello,

if anyone is interessted in a Q931 decoder for FS, I found a way to get
FS's Q931 debug hexdumps decoded in wireshark. It's quite simple and
mainly about encapsulating each Q931 dump into a TPKT paket and that one
in a TCP/IP paket and to put all TCP/IP pakets into a pcap file.


regards
helmut

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[brian at freeswitch.org]

Any automated way of doing this? Open a Jira on it.. it would be neat
to be able to save the q931 into a pcap file.... maybe libpcap can help?

/b

On Jan 17, 2009, at 10:16 AM, Helmut Kuper wrote:

[helmut.kuper at ewetel.de]

Hi Brian,

currently it's a simple perl script which greps all Q931 hexdumps from
FS logfile converting them to a TPKT packet, and writing those to a
separate local file (wireshark's text2pcap file format). This 1st step
is easy to put right into FS ozmod_isdn debug code.
The 2nd step is to convert the new file into a .pcap file with adding
TCP/IP dummy packet in front of each TPKT packet. This is done via
test2pcap. This .pcap file is ready to be decoded by wireshark.

I put both steps into a little shell script and added a 3rd step to get
those .pcap file emailed from the Server to my Desktop.

regards
helmut


Brian West schrieb:

[brian at freeswitch.org]

Maybe open a jira with this info? Maybe it can all be done as a one
step process in the ozmod_isdn

/b

On Jan 17, 2009, at 10:58 AM, Helmut Kuper wrote:

[msc at freeswitch.org]

Guys this is awesome! Helmut, if you need any help with jira just let
me know.
-MC

Sent from my iPhone

On Jan 17, 2009, at 9:20 AM, Brian West <brian@freeswitch.org> wrote:

[helmut.kuper at ewetel.de]

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Hello Michael,

I'm currently on my way to put all those shell and perl stuff into C
code. As soon as that works I try to put it in ozmod_isdn. So after that
FS will be able to enable Q931Pcapfile generation. After that I will
send the patch to FS.

Hope this is ok for you.


What do you mean with "help with jira"? I thought it is just a bug
tracker... If it's also a feature request tool, I will feed it with
documentation about what I did.


regards
helmut

Am 17.01.2009 21:44, schrieb Michael S Collins:

[anthony.minessale at g...]

jira is an issue tracker in general.
We use it for bugs, features, bounties and anything else that is an ongoing process that
we want to do a workflow on. There is an issue type of new feature you can file such things under
and assign it to yourself so we can track and complete the task in a managed way.


On Mon, Jan 19, 2009 at 2:42 AM, Helmut Kuper <helmut.kuper@ewetel.de (helmut.kuper@ewetel.de)> wrote:

[michal.bielicki at voi...]

It is both

Helmut Kuper schrieb:

[saigop at gmail.com]

How can I capture Q931 packets by separating the D channel and B channel?

On Mon, Jan 19, 2009 at 7:23 PM, Michal Bielicki <michal.bielicki@voiceworks.pl> wrote:

[brian at freeswitch.org]

Well the D channel is the only channel where any Q931 should be
present. If you happen to have it on a B channel something has gone
horribly wrong!

/b

On Jan 19, 2009, at 12:42 PM, Gopalakrishnan A.N wrote:

[msc at freeswitch.org]

Until Helmut gets his script, etc. all set the only choice you have is
to capture the debug output on the command line.
-MC

On Mon, Jan 19, 2009 at 10:42 AM, Gopalakrishnan A.N <saigop@gmail.com> wrote:

[helmut.kuper at ewetel.de]

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Hello,

just an update about my progress in this.

Currently I have working C code which creates a pcap file containing all
needed protocoll headers in front of the Q931 dump. I use libpcap to
create the pcap file. The protocol addresses of each protocol header
structure are dynamically set by the code to reflect direction, sequence
and timeline of each Q931 packet in whireshark. Wireshark can read and
decode the current packets generated by my C code correctly.

regards
helmut



Am 19.01.2009 19:46, schrieb Michael Collins:

[anthony.minessale at g...]

Do you have it integrated into openzap or just standalone?
We can give you commit access to openzap if you want to maintain the patch in tree if you'd like.


On Wed, Jan 21, 2009 at 5:58 AM, Helmut Kuper <helmut.kuper@ewetel.de (helmut.kuper@ewetel.de)> wrote:

[msc at freeswitch.org]

On Wed, Jan 21, 2009 at 3:58 AM, Helmut Kuper <helmut.kuper@ewetel.de> wrote:

[helmut.kuper at ewetel.de]

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Hello,

It's a standalone program to profe concept. So I think I will get it
working this week as standalone.

Next week I plan to start to integrate the code into openzap/ozmod_isdn.c

Biggest problem currently (in my head) is the file handling of the pcap
file. Currently I have only one file which is opened at startup time and
closed during shutdown. In between there is no checking for a certain
file size to make a file cycle decision or stopping and closing the
file. I guess it is better to have a FS console command to start stop
the trace on demand instead of having a config parameter which enables
the tracing during FS lifetime.

Further problem is that I have no way to test the code on a windows
machine. So I have no idea whether it compiles on windows or not.

Thanks for your support so far.

regards
Helmut

Am 21.01.2009 14:53, schrieb Anthony Minessale: