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# Lookup the hostname in DNS if not set
lookup_hostname()
{
[ -z "${new_ip_address}" ] && return 1
local h=
# Silly ISC programs love to send error text to stdout
if type dig >/dev/null 2>&1; then
h=`dig +short -x ${new_ip_address}`
if [ $? = 0 ]; then
echo "${h}" | sed 's/\.$//'
return 0
fi
elif type host >/dev/null 2>&1; then
h=`host ${new_ip_address}`
if [ $? = 0 ]; then
echo "${h}" \
| sed 's/.* domain name pointer \(.*\)./\1/'
return 0
fi
fi
return 1
}
set_hostname()
{
if [ -z "${new_host_name}" -a -z "${new_fqdn_name}" ]; then
export new_host_name="$(lookup_hostname)"
fi
}
case "${reason}" in
BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT) set_hostname;;
esac
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