Created
April 30, 2017 14:49
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Check external IP and alert on change
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#!/bin/bash | |
#set debug value to "true" to output debug code | |
debug=false | |
SlackURL_key="https://hooks.slack.com/services/KEYDATA01/KEYDATA02/KEYDATA03" | |
SlackUsername="icanhazip" | |
#obtain current IP from icanhazip | |
myip=`curl -4 -s icanhazip.com` | |
if [ $debug == "true" ]; then echo "current IP = " $myip; fi | |
#check for existing temp file to compare last known IP | |
if [ -e /tmp/myip.txt ] | |
then | |
tmpip=`cat /tmp/myip.txt` | |
echo "temp IP = " $tmpip | |
if [ $myip == $tmpip ] | |
then | |
if [ $debug == "true" ]; then echo "good"; fi | |
else | |
#if the IP does not match, sent a Slack alert! | |
Slackjson="{\"text\":\"External IP Changed!\nOld IP = ${tmpip}\nCurrent IP = ${myip}\", \"username\":\"${SlackUsername}\"}" | |
if [ $debug == "true" ]; then echo "nogood"; fi | |
fi | |
#if no current temp file, create a new one with the current IP | |
else | |
echo $myip > /tmp/myip.txt | |
#if no temp file, send notice that there was nothing to compare against | |
Slackjson="{\"text\":\"No temp file to compare against!\nCurrent IP = ${myip}\", \"username\":\"${SlackUsername}\"}" | |
if [ $debug == "true" ]; then echo "temp file did not exist, creating a new one"; fi | |
fi | |
#check if the Slackjson variable has been set and if so, send to Slack | |
if [ -n "${Slackjson}" ] | |
then | |
curl --silent --request POST --header "Content-Type: application/json" --data "${Slackjson}" ${SlackURL_key} > /dev/null | |
if [ $debug == "true" ]; then echo "sending to Slack"; fi | |
else | |
if [ $debug == "true" ]; then echo "no Slack json variable set"; fi | |
fi |
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