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

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

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.

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]

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!

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 {}