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Extracting MSML xml code from packet captures

Introduction

This article describes a method to extract MSML content from a wireshark trace.  It can also be used if the user needs to search for specific elements in the MSML scripts like conference id's, dialog names, ... etc. 

A small awk script is used that enables one to all the MSML content out of packet captures and some basic information about the rest of the packets.

How to use it

  1. Unzip the attached zip file.
  2. Use it either in a Cygwin environment on Windows or in a Linux environment.
  3. Use either tethereal or tshark (The text based version of the Ethereal and Wireshark)
tshark -r int3.pcap -V |awk -f msmlextract.awk > output.txt
 

or

 

tethereal -r int3.pcap -V |awk -f msmlextract.awk > output.txt
 

The user can also filter for example on a particular SIP call id with the regular Ethereal or Wireshark filters:

tshark -r int3.pcap -V -R 'sip.Call-ID=="MjNmZTYwMDViZmRjMDEyMjA3NjIzMjFjNDliZmFmMzQ."' |awk -f msmlextract.awk > output.txt
 

Example output:

Packet
    Arrival Time: Jul 15, 2012 23:57:47.083458000
    [Time delta from previous captured frame: 19.982491000 seconds]
    [Time delta from previous displayed frame: 19.982491000 seconds]
    Frame Number: 33932
    Request-Line: INFO sip:LinuxAMS@192.168.11.145:5060 SIP/2.0
            <?xml
                version="1.0"
                encoding="UTF-8"
                ?>
            <msml
                version="1.0">
                <modifyconference
                    id="conf:ping-conference"
                    mark="0">
                    <audiomix>
                        <asn
                            ri="0"/>
                        </audiomix>
                    </modifyconference>
                <!-- AMS ping -->
                </msml>
  
Packet
    Arrival Time: Jul 15, 2012 23:57:47.086323000
    [Time delta from previous captured frame: 0.002865000 seconds]
    [Time delta from previous displayed frame: 0.002865000 seconds]
    Frame Number: 33933
    Status-Line: SIP/2.0 200 OK
            <?xml
                version="1.0"
                encoding="UTF-8"
                ?>
            <msml
                version="1.1">
                <result
                    mark="0"
                    response="200"/>
                </msml>
  
Packet
  
    Arrival Time: Jul 15, 2012 23:57:47.086494000
    [Time delta from previous captured frame: 0.000171000 seconds]
    [Time delta from previous displayed frame: 0.000171000 seconds]
    Frame Number: 33934

 

Legal Note

This document discusses one or more open source products, systems and/or releases. Dialogic is not responsible for your decision to use open source in connection with Dialogic products (including without limitation those referred to herein), nor is Dialogic responsible for any present or future effects such usage might have, including without limitation effects on your products, your business, or your intellectual property rights.



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First published: 25-Mar-2013
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