Wifi Nuisances
##############

libpcap missing netlink
=======================

* On some Debian-based installations, libpcap builds without libnl.

* This will cause weird perversions

    * log entries for devices not supporting monitor mode, when they clearly do

    * Kismet, Nzyme, and Aircrack-ng failing collection

    * possible hair loss

Prepare libpcap build
---------------------

* For Kali, add */etc/apt/sources.list.d/kali-src.list*

.. code-block::

    deb-src http://http.kali.org/kali kali-rolling main non-free contrib
..

* Create a build environment, create a source path, and download the source package

.. code-block:: bash
    :linenos:

    apt-get update
    apt-get install build-essential libnl-genl-3-dev
    mkdir src; cd src
    apt source libpcap
    cd libpcap-*
..

Modify libpcap build
--------------------

* Modify *debian/control* to include libnl

    * Add `libnl-genl-3-dev,` to every `Build-Depends` and `Depends` block

    * See example below.  The punctuation matters.

.. code-block:: yaml
    :linenos:
    :caption: Before

    Source: libpcap
    Section: devel
    Priority: optional
    Maintainer: Romain Francoise <rfrancoise@debian.org>
    Build-Depends: autotools-dev,
               bison,
               debhelper (>= 8.9.7),
               dh-autoreconf,
               flex,
               libbluetooth-dev [linux-any],
               libdbus-1-dev,
               linux-libc-dev (>= 2.6.27) [i386]
..


.. code-block:: yaml
    :linenos:
    :caption: After

    Source: libpcap
    Section: devel
    Priority: optional
    Maintainer: Romain Francoise <rfrancoise@debian.org>
    Build-Depends: autotools-dev,
               bison,
               debhelper (>= 8.9.7),
               dh-autoreconf,
               flex,
               libbluetooth-dev [linux-any],
               libdbus-1-dev,
               libnl-genl-3-dev,
               linux-libc-dev (>= 2.6.27) [i386]
..

Build libpcap
-------------

* Install missing dependencies and build!

.. code-block:: bash
    :linenos:

    apt build-dep .
    # Install still-missing or conflicting dependencies, if needed
    # In my first run on a Debian box, I had to...
    #  apt-get install libdbus-1-3=1.12.20-0+deb10u1 libbluetooth3=5.50-1.2~deb10u1
    # In my second run on a Kali-pi box, I was already set.
    dpkg-buildpackage -uc -us -b
    cd ..
    # Look at the list of created .deb packages.  Pick one and "dpkg -i" it.
    # Alternately, run this command and it will install all you built, culmunating
    #  in the latest version for your architecture.
    /bin/ls *.deb | egrep -v "dbg|dev" | grep `uname -r | perl -pe 's/.*-//'` | xargs -i dpkg -i {}
..