Zerotier api auto alert bash script

[htjiawi]

#!/bin/bash

tested on ubuntu 20.04

purpose automate console monitoring through Zerotier API token and send out SMTP alert on system offline over 1 hour

pre-requirements, will need the following packages: curl, jq and bc

VALUE YOU NEED TO UPDATE:

YOUR_SMTP_OR_USE_MAIL.SMTOP2GO.COM

2525

AUTHORIZE_SENDER@DOMAIN.COM

YOUR_NOTIFICATIO_EMAIL@DOMAIN.COM

ZEROTIER_API_TOKEN

YOUR_ZEROTIER_NETWORK

NODE_ID1 … NODE_IDx

function checkStatus {
read -u 3 sts line
expect=250
if [ $# -eq 1 ] ; then
expect="${1}"
fi
if [ $sts -ne $expect ] ; then
echo “Error: ${line}”
exit
fi
}

function send_mail {
MailHost=“YOUR_SMTP_OR_USE_MAIL.SMTOP2GO.COM”
MailPort=2525
FromAddr="AUTHORIZE_SENDER@DOMAIN.COM"
ToAddr="YOUR_NOTIFICATIO_EMAIL@DOMAIN.COM"

    # Brilliant!!
    exec 3<>/dev/tcp/${MailHost}/${MailPort} ; checkStatus 220

    echo "HELO ${MyHost}" >&3 ; checkStatus
    echo "MAIL FROM: ${FromAddr}" >&3 ; checkStatus
    echo "RCPT TO: ${ToAddr}" >&3 ; checkStatus
    echo "DATA" >&3 ; checkStatus 354
    echo "Subject: ${Subject}" >&3

    # Insert one blank line here to let the relay know you are done sending headers
    # Otherwise a colon ":" in the message text will result in no text being sent.
    echo "" >&3

    # Send the message text and close
    echo "${Message}" >&3
    echo "." >&3 ; checkStatus

}

function checknode () {
response=$(curl -s -H “Authorization: Bearer ZEROTIER_API_TOKEN”
-H “Content-Type: application/json”
https://my.zerotier.com/api/v1/network/YOUR_ZEROTIER_NETWORK/member/$1)
time1=$(jq ‘.lastOnline’ <<< “$response”)
name=$(jq ‘.name’ <<< “$response”)
IP=$(jq ‘.physicalAddress’ <<< “$response”)
time1=$(bc -l <<< “$time1/1000”)
time2=$(bc -l <<< “$EPOCHREALTIME”)
timediff=$(bc -l <<< “$time2 - $time1”)
timehours=$(bc <<< “$timediff/3600”)
if test $timehours -ge 1
then
send=send+1
fi
echo $1, $name, $IP, $timehours
Message="$Message $1 $name $IP $timehours\n"
}

send=0
Message="\n"
checknode “NODE_ID1”
checknode “NODE_ID2”
checknode “NODE_ID3”
checknode “NODE_ID4”
checknode “NODE_ID5”
checknode “NODE_ID6”
checknode “NODE_ID7”
checknode “NODE_ID8”
checknode “NODE_ID9”
checknode “NODE_ID10”
checknode “NODE_ID11”
checknode “NODE_ID12”
checknode “NODE_ID13”
checknode “NODE_ID14”
checknode “NODE_ID15”
checknode “NODE_ID16”

Message=$(echo -e $Message)
Subject=“Zerotier Status Alert”

if test $send -ge 1
then
send_mail
fi