/etc/dhcp/dhclient-exit-hooks.d/debug is in isc-dhcp-client 4.2.2.dfsg.1-5+deb70u8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 /etc/dhcp3/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 ${0%/*}, dumping variables. \
>> /tmp/dhclient-script.debug
# loop over the 4 possible prefixes: (empty), cur_, new_, old_
for prefix in '' 'cur_' 'new_' 'old_'; do
# loop over the DHCP variables passed to dhclient-script
for basevar in reason interface medium alias_ip_address \
ip_address host_name network_number subnet_mask \
broadcast_address routers static_routes \
rfc3442_classless_static_routes \
domain_name domain_search domain_name_servers \
netbios_name_servers netbios_scope \
ntp_servers \
ip6_address ip6_prefix ip6_prefixlen \
dhcp6_domain_search dhcp6_name_servers ; do
var="${prefix}${basevar}"
# show only variables with values set
if [ -n "${!var}" ]; then
echo "$var='${!var}'" >> /tmp/dhclient-script.debug
fi
done
done
echo '--------------------------' >> /tmp/dhclient-script.debug
fi
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