/etc/dhcp/dhclient-enter-hooks.d/resolvconf is in resolvconf 1.79.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Script fragment to make dhclient supply nameserver information to resolvconf
#
# Tips:
# * Be careful about changing the environment since this is sourced
# * This script fragment uses bash features
# * As of isc-dhcp-client 4.2 the "reason" (for running the script) can be one of the following.
# (Listed on man page:) MEDIUM(0) PREINIT(0) BOUND(M) RENEW(M) REBIND(M) REBOOT(M) EXPIRE(D) FAIL(D) RELEASE(D) STOP(D) NBI(-) TIMEOUT(M)
# (Also used in master script:) ARPCHECK(0), ARPSEND(0)
# (Also used in master script:) PREINIT6(0) BOUND6(M) RENEW6(M) REBIND6(M) DEPREF6(0) EXPIRE6(D) RELEASE6(D) STOP6(D)
# (0) = master script does not run make_resolv_conf
# (M) = master script runs make_resolv_conf
# (D) = master script downs interface
# (-) = master script does nothing with this
if [ -x /sbin/resolvconf ] ; then
# For safety, first undefine the nasty default make_resolv_conf()
make_resolv_conf() { : ; }
case "$reason" in
BOUND|RENEW|REBIND|REBOOT|TIMEOUT)
# Define a resolvconf-compatible m_r_c() function
# It gets run later (or, in the TIMEOUT case, MAY get run later)
make_resolv_conf() {
local R
local N
R=""
if [ "$new_domain_name_servers" ] && [ "$new_domain_name" ] ; then
R="${R}domain $new_domain_name
"
fi
if [ "$new_domain_name_servers" ] && [ "$new_domain_search" ] ; then
R="${R}search $new_domain_search
"
fi
for N in $new_domain_name_servers ; do
R="${R}nameserver $N
"
done
[ ! "$interface" ] || echo -n "$R" | /sbin/resolvconf -a "${interface}.dhclient"
}
;;
BOUND6|RENEW6|REBIND6)
# Define a resolvconf-compatible m_r_c() function
# It gets run later (or, in the TIMEOUT case, MAY get run later)
make_resolv_conf() {
local R
local N
local N_LOW
local ZONE_ID
R=""
if [ "$new_dhcp6_name_servers" ] && [ "$new_dhcp6_domain_search" ] ; then
R="${R}search $new_dhcp6_domain_search
"
fi
for N in $new_dhcp6_name_servers ; do
# If the nameserver has a link-local address
# then add a zone ID (interface name) to it.
N_LOW="$(echo "$N" | tr '[:upper:]' '[:lower:]')"
if expr "$N_LOW" : ^fe80:: >/dev/null ; then
ZONE_ID="%$interface"
else
ZONE_ID=""
fi
R="${R}nameserver $N$ZONE_ID
"
done
[ ! "$interface" ] || echo -n "$R" | /sbin/resolvconf -a "${interface}.ip6.dhclient"
}
;;
EXPIRE|FAIL|RELEASE|STOP)
# Delete resolv.conf info
[ ! "$interface" ] || /sbin/resolvconf -d "${interface}.dhclient"
;;
EXPIRE6|RELEASE6|STOP6)
# Delete resolv.conf info
[ ! "$interface" ] || /sbin/resolvconf -d "${interface}.ip6.dhclient"
;;
esac
fi
|