add script

react_to_ip_change.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+IP_FILE='/tmp/ipaddress'
+
+[[ -f "${IP_FILE}" ]] && IP_OLD="$(< "${IP_FILE}" )"
+
+IP_NEW="$(curl -s -4 http://icanhazip.com/)"
+
+# work around to report IP to root server
+ssh wiebelbach@lusiardi.de -i ~/.ssh/id_rsa_update_ip "echo $IP_NEW > IP"
+
+if [[ "${IP_OLD}" != "${IP_NEW}" ]]; then
+        echo "change from ${IP_OLD} to ${IP_NEW}"
+        echo ${IP_NEW} > ${IP_FILE}
+        for SCRIPT in `ls /usr/local/etc/ipchange.d/*.sh`
+        do
+                ${SCRIPT} ${IP_NEW}
+        done
+else
+        echo "no update required (still ${IP_OLD})"
+fi
+