Update for IPv6 addresses...

... along with various debugging cleanups.

update_ip.sh

@@ -6,32 +6,60 @@ zone=dyn.example.com
 host=desktop
 secret=""
 
-ip=$(wget -4 -q -O - http://treehouse.org.za/ip)
-#set_ip=$(dig +short -t a ${host}.${zone})
-set_ip=$(nslookup -type=a ${host}.${zone} | awk '/^Address: / { print $2 }')
+new_ip4=$( wget -4 -q -O - https://treehouse.org.za/ip )
+new_ip6=$( ip -6 addr show eth0 | grep global | grep -oP '(?<=inet6\s)[\da-f:]+' )
 
-if [ -z ${ip} ] || [ -z ${cache} ]; then
-	exit;
-fi      
+cur_ip4=$( nslookup -type=a ${host}.${zone} | grep -oP '(?<=^Address:\ )\d+(\.\d+){3}$' )
+cur_ip6=$( nslookup -type=aaaa ${host}.${zone} | grep -oP '(?<=^Address:\ )[\da-f:]+$' )
+
+if [ -z ${new_ip4} ] && [ -z ${new_ip6} ]; then
+        exit;
+fi
+
+if [ -z ${cache} ]; then
+        exit;
+fi
 
 if [ -f "${HOME}/${cache}" ]; then
-	old_ip=$(cat "${HOME}/${cache}")
+        old_ip4=$( cat "${HOME}/${cache}" | grep "\." )
+        old_ip6=$( cat "${HOME}/${cache}" | grep "\:" )
 fi
 
-if [ "${set_ip}" = "${ip}" ] && [ "${ip}" = "${old_ip}" ]; then
-	exit;
+if [ "${cur_ip4}" = "${new_ip4}" ] && [ "${new_ip4}" = "${old_ip4}" ] &&
+   [ "${cur_ip6}" = "${new_ip6}" ] && [ "${new_ip6}" = "${old_ip6}" ]; then
+        exit;
 else
-	rm -f "${HOME}/${cache}"
-	echo "${ip}" > "${HOME}/${cache}"
+        rm -f "${HOME}/${cache}"
 fi
 
-cat <<EOF | nsupdate
-server ${server}
-zone ${zone}.
-key ${host}.${zone} ${secret}
-update delete ${host}.${zone}. A
-update delete ${host}.${zone}. TXT
-update add ${host}.${zone}. 60 A $ip
-update add ${host}.${zone}. 60 TXT "Updated on $(date)"
-send
+if [ -f "${HOME}/${cache}" ]; then
+        old_ip4=$( cat "${HOME}/${cache}" | grep "\." )
+        old_ip6=$( cat "${HOME}/${cache}" | grep "\:" )
+fi
+
+if [ "${cur_ip4}" = "${new_ip4}" ] && [ "${new_ip4}" = "${old_ip4}" ] &&
+   [ "${cur_ip6}" = "${new_ip6}" ] && [ "${new_ip6}" = "${old_ip6}" ]; then
+        exit;
+else
+        rm -f "${HOME}/${cache}"
+fi
+
+update=$( cat <<-EOF
+        server ${server}
+        zone ${zone}.
+        key ${host}.${zone} ${secret}
+        update delete ${host}.${zone}.
+        update add ${host}.${zone}. 60 A ${new_ip4}
+        update add ${host}.${zone}. 60 AAAA ${new_ip6}
+        update add ${host}.${zone}. 60 TXT "Updated on $( date )"
+        send
 EOF
+)
+
+if echo "${update}" | nsupdate ; then
+    echo "${new_ip4}" >> "${HOME}/${cache}"
+    echo "${new_ip6}" >> "${HOME}/${cache}"
+else
+    echo "Request was:"
+    echo "${update}"
+fi