cron.daily/chkrootkit log filtering needs to include current names for dhcpcd and dhclient binaries

[Nathan Stratton Treadway]

the cron.daily/chkrootkit script's current logic for simplifying the PACKET SNIFFER lines for dhclient and dhcpcd processes needs to be updated to include the names of current versions of those binaries.

[Nathan Stratton Treadway (nathanst)]

We have found that chkrootkit now complains after each reboot, with a message similar to:
-eth0: PACKET SNIFFER(/sbin/dhclient[895])
+eth0: PACKET SNIFFER(/sbin/dhclient[888])
---[ END: diff -u /var/log/chkrootkit/log.expected /var/log/chkrootkit/log.today ] ---

Looking at /etc/cron.daily/chkrootkit, I noticed that there is logic that attempts to avoid such warnings:
     # the sed expression replaces the messages about /sbin/dhclient3 /usr/sbin/dhcpd3
     # with a message that is the same whatever order eth0 and eth1 were scanned
     sed -r -e 's,eth(0|1)(:[0-9])?: PACKET SNIFFER\((/sbin/dhclient3|/usr/sbin/dhcpd3)\[[0-9]+\]\),eth\[0|1\]: PACKET SNIFFER\([dhclient3|dhcpd3]{PID}\),' \
                                -e 's/(! \w+\s+)[ 0-9]{4}[0-9]/\1#####/' $LOG_DIR/log.today.raw > $LOG_DIR/log.today

... but this no longer works as expected, since the exact name of the "dhclient' binary has changed.

[Christian Ehrhardt  (paelzer)]

Note: Will be picked up by auto-syncing packages once 18.04 is fully released and the freeze lifted

[Andreas Hasenack (ahasenack)]

This is fixed in Cosmic, which now has 0.52-2