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:/ snap / core18 / 2999 / etc / dhcp / dhclient-enter-hooks.d /
Filename : debug
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#
# The purpose of this script is just to show the variables that are
# available to all the scripts in this directory. All these scripts are
# called from dhclient-script, which exports all the variables shown
# before. If you want to debug a problem with your DHCP setup you can
# enable this script and take a look at /tmp/dhclient-script.debug.

# To enable this script set the following variable to "yes"
RUN="no"

if [ "$RUN" = "yes" ]; then
	echo "$(date): entering ${1%/*}, dumping variables." \
		>> /tmp/dhclient-script.debug

	# loop over the 4 possible prefixes: (empty), cur_, new_, old_
	for prefix in '' 'cur_' 'new_' 'old_'; do
		# loop over the DHCP variables passed to dhclient-script
		for basevar in reason interface medium alias_ip_address \
			       ip_address host_name network_number subnet_mask \
			       broadcast_address routers static_routes \
			       rfc3442_classless_static_routes \
			       domain_name domain_search domain_name_servers \
			       netbios_name_servers netbios_scope \
			       ntp_servers \
			       ip6_address ip6_prefix ip6_prefixlen \
			       dhcp6_domain_search dhcp6_name_servers ; do
			var="${prefix}${basevar}"
			eval "content=\$$var"

			# show only variables with values set
			if [ -n "${content}" ]; then
				echo "$var='${content}'" >> /tmp/dhclient-script.debug
			fi
		done
	done

	echo '--------------------------' >> /tmp/dhclient-script.debug
fi