OVH DynDNS ipv4 and ipv6

dyndns.sh

#! /usr/bin/env bash
 
set -e           # abort on nonzero exitstatus
set -u           # abort on unbound variable
set -o pipefail  # don't hide errors within pipes
 
TIME_START=$(date +%s%3N)
 
[ -z "$DYNDNS_LOGIN" ] && echo "missing variable DYNDNS_LOGIN"
[ -z "$DYNDNS_PASSWORD" ] && echo "missing variable DYNDNS_PASSWORD"
[ -z "$DYNDNS_HOST" ] && echo "missing variable DYNDNS_HOST"
[ -z "$KUMA_API_KEY" ] && echo "missing variable KUMA_API_KEY"
 
HAVE_BEEN_UPDATED=false
 
getip() {
    CURRENT_IP4=$(curl -4 -m 5 -s -S http://ifconfig.me/ip)
    CURRENT_IP6=$(curl -6 -m 5 -s -S http://ifconfig.me/ip)
    OLD_IP4=$(dig A +short $DYNDNS_HOST)
    OLD_IP6=$(dig AAAA +short $DYNDNS_HOST)
}
 
echo "[$(date -R)] begin dyndns check"
getip
 
if [ "$CURRENT_IP4" ]; then
    if [ "$OLD_IP4" != "$CURRENT_IP4" ]; then
        echo "[$(date -R)] Updating IPv4 from $OLD_IP4 to $CURRENT_IP4"
        RES=$(curl -m 5 -L -s -S --location-trusted --user "$DYNDNS_LOGIN:$DYNDNS_PASSWORD" "https://dns.eu.ovhapis.com/nic/update?system=dyndns&hostname=$DYNDNS_HOST&myip=$CURRENT_IP4")
        echo "[$(date -R)] OVH response: $RES"
        HAVE_BEEN_UPDATED=true
    fi
else
    echo "ERROR: Unable to get current IPv4 addresse"
    TIME_DIFF=$(($(date +%s%3N)-$TIME_START))
    curl -m 5 -s -S --output /dev/null "https://status.azlux.fr/api/push/$KUMA_API_KEY?status=down&msg=IPv4&ping=$TIME_DIFF"
    exit 1
fi
 
if [ "$CURRENT_IP6" ]; then
    if [ "$OLD_IP6" != "$CURRENT_IP6" ]; then
        echo "[$(date -R)] Updating IPv6 from $OLD_IP6 to $CURRENT_IP6"
        RES=$(curl -m 5 -s -S -L --location-trusted --user "$DYNDNS_LOGIN:$DYNDNS_PASSWORD" "https://dns.eu.ovhapis.com/nic/update?system=dyndns&hostname=$DYNDNS_HOST&myip=$CURRENT_IP6")
        echo "[$(date -R)] OVH response: $RES"
        HAVE_BEEN_UPDATED=true
    fi
else
    echo "ERROR: Unable to get current IPv6 addresse"
    TIME_DIFF=$(($(date +%s%3N)-$TIME_START))
    curl -m 5 -s -S --output /dev/null "https://status.azlux.fr/api/push/$KUMA_API_KEY?status=down&msg=IPv6&ping=$TIME_DIFF"
    exit 1
fi
 
 
TIME_DIFF=$(($(date +%s%3N)-$TIME_START))
curl -m 5 -s -S --output /dev/null "https://status.azlux.fr/api/push/$KUMA_API_KEY?status=up&msg=OK&ping=$TIME_DIFF"
 
if [ "$HAVE_BEEN_UPDATED" = false ]; then
    echo [$(date -R)] nothing to change
    exit 0
fi
 
exit 0