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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
}
if $if_up; then
set_hostname
fi
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