Wireshark Dissector Plugin for DLEP

Wireshark dissector plugin for the Dynamic Link Exchange Protocol (DLEP).

Installation

The following instructions are tailored and tested for Ubuntu 16.04 64-bit Desktop and Wireshark 2.6.8:

• Install wireshark, install wireshark dependencies, download wireshark source code, and extract the DLEP plugin:

  ```bash
  cd ~/Downloads
  sudo apt-get install wireshark
  sudo apt-get build-dep wireshark
  apt-get source wireshark
  tar -zxf /path/to/dissector/tarball/dlep-wireshark-dissector-1.0.0.tgz -C ~/Downloads/wireshark-2.6.8/plugins/epan/dlep --strip-components=1
  ```
  

• Make and install the plugin:

  ```bash
  cd ~/Downloads/wireshark-2.6.8
  mkdir build
  cd build
  cmake -DCUSTOM_PLUGIN_SRC_DIR="plugins/epan/dlep" ../
  make -j8 -C plugins/epan/dlep
  mkdir -p ~/.local/lib/wireshark/plugins/2.6/epan
  cp run/plugins/2.6/epan/dlep.so ~/.local/lib/wireshark/plugins/2.6/epan/
  ```
  

Usage

• Verify installation by confirming that the plugin is listed in the following Wireshark menu:

    Help -> About Wireshark -> Plugins
  

• Open up a sample capture file:

    wireshark plugins/epan/dlep/test/capture1.pcapng
  

• There are two preferences that adjust the TCP port and UDP port associated with DLEP packets. User preferences for this plugin may be set in the following menu:

    Edit -> Preferences... -> Protocols -> DLEP
  

Testing

Sample DLEP capture files and a README are located in dlep/test. The capture files may be opened in Wireshark as an example capture or used for fuzz-testing the plugin.

Caveats / Future Work

• This dissector plugin adheres to RFC 8175.
• This plugin attempts to decode all Data Items within a DLEP Signal or Message. While unrecognized Data Items are reported as such, invalid or disallowed duplicate Data Items are not indicated (Section 12.1 of RFC 8175).
• This plugin does not dissect Data Items belonging to DLEP extensions -- such Data Items are marked as "Unknown".
• While DLEP TCP/UDP ports are configurable via user preferences, this plugin does not dynamically register ports provided by IPv4/6 Connection Point Data Items.
• This plugin does not perform TCP segment reassembly. DLEP messages are assumed to not exceed the MTU of the link between a modem and router participating in the DLEP Session.