ssh mail login

#!/bin/bash

mail=user@domain.tld
monitored_user=root
monitored_ip=x.x.x.x

hostname=$(hostname)

# add a welcome message:
printf >&2 "\nWelcome on $hostname $USER\n"

read -d " " ip <<< $SSH_CONNECTION

[[ $ip == $monitored_ip && $USER == $monitored_user ]] || exit 0

date=$(date "+%d.%m.%Y %Hh%M")
reverse=$(dig -x $ip +short)

mail -s "Connexion of $USER on $hostname" $mail <<EOF

IP: $ip
Reverse: $reverse
Date: $date
EOF