lookup_hostname()
{
[ -z "$new_ip_address" ] && return 1
# Silly ISC programs love to send error text to stdout
if command -v dig >/dev/null 2>&1; then
h=$(dig +short -x $new_ip_address)
if [ $? = 0 ]; then
echo "$h" | sed 's/\.$//'
return 0
fi
elif command -v host >/dev/null 2>&1; then
h=$(host $new_ip_address)
if [ $? = 0 ]; then
echo "$h" \
| sed 's/.* domain name pointer \(.*\)./\1/'
return 0
fi
elif command -v getent >/dev/null 2>&1; then
h=$(getent hosts $new_ip_address)
if [ $? = 0 ]; then
echo "$h" | sed 's/[^ ]* *\([^ ]*\).*/\1/'
return 0
fi
fi
return 1
}
set_hostname()
{
if [ -z "${new_host_name}${new_fqdn_name}" ]; then
export new_host_name="$(lookup_hostname)"
fi
}
