#/bin/sh

##########
# CONFIG #
##########

if [ -f dyndns.env ]
then
  export $(cat dyndns.env | sed 's/#.*//g' | xargs)
else
  echo "Error, dyndns.env doesn't exist"
  exit 1
fi

if [ -z "$HOST" ] || [ -z "$LOGIN" ] || [ -z "$PASSWORD" ] || [ -z "$PATH_LOG" ]
then
  echo "Error, please check your configuration in dyndns.env"
  exit 2
fi

###########
# GET IPs #
###########

HOST_IP=`dig A +short $HOST`

# Flag 4 stand for IPv4
CURRENT_IP=`curl -s4 ifconfig.io`

#######
# LOG #
#######

echo "====================================" >> $PATH_LOG
echo "Run dyndns - "$(date +"%D, %T") >> $PATH_LOG
echo "Domain : $HOST" >> $PATH_LOG
echo "Current IP : $CURRENT_IP" >> $PATH_LOG
echo "Host IP : $HOST_IP" >> $PATH_LOG

###############
# DO THE WORK #
###############
if [ -z "$CURRENT_IP" -o -z "$HOST_IP" ]
then
        echo "No IP retrieved" >> $PATH_LOG
else
        if [ "$HOST_IP" != "$CURRENT_IP" ]
        then
                echo "IP has changed" >> $PATH_LOG
                RES=`curl -s --user "$LOGIN:$PASSWORD" "http://www.ovh.com/nic/update?system=dyndns&hostname=$HOST&myip=$CURRENT_IP"`
                echo "Result request dynHost" >> $PATH_LOG
                echo "$RES" >> $PATH_LOG
                echo "IP changed for $HOST, new IP is $CURRENT_IP"
        else
                echo "IP has not changed" >> $PATH_LOG
        fi
fi