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#!/bin/bash
# 1st argument should be fqdm
# returns 0 if certificate is expired
function cert_check_expired() {
SERVERNAME=$1; shift # for SNI stuff
IP=$(dig +noall +answer +short $SERVERNAME)
now_epoch=$(date +%s)
expiry_date=$(echo | openssl s_client -servername $SERVERNAME -connect $IP:443 2>/dev/null </dev/null | openssl x509 -noout -enddate | cut -d "=" -f 2)
expiry_epoch=$(date -d "$expiry_date" +%s)
if [[ $(($expiry_epoch - $now_epoch)) -le 0 ]]; then return 0; fi # return statement sets the $? variable
}
cert_check_expired "www.fatalhalt.net"
echo $?
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