First version of files

README.md

@@ -1,3 +1,32 @@
-# gandi-dynamic-dns
+# Gandi Dynamic DNS
+
+Cron job to auto update a DNS record when WAN IP changes using Gandi Live DNS API on Debian GNU/Linux
+
+## To install 
+
+```
+git clone https://gitlab.com/lab.8916100448256/gandi-dynamic-dns.git ./gandi-dynamic-dns
+cd ./gandi-dynamic-dns
+sudo bash ./install.sh
+```
+
+Then configure DNS record info and API key in file /etc/live-dns/live-dns.conf
+
+
+## How it works
+### /etc/cron.d/live-dns-update
+Cron job definition to check for WAN IP change and call Live DNS API to update the DNS record if necessary. By default runs the check/update script 2 times per hour, at every hour past 12 and 42 minutes.
+
+### /etc/live-dns/live-dns.conf
+Configuration file for the check/update script
+Needs to contains 3 environment variable definitions
++ DOMAIN="domain.tld" : Replace domain.tld with your domain name
++ RECORD="host" : Replace host with the sub domain you want to update when WAN IP changes
++ APIKEY="Your-API-Key" : Replace with you API key generated on the Gandi web interface.
+
+
+### /usr/local/bin/live-dns-update.sh
+This the script that is called by the cron job.
+
+This script is based on the sample provided on Gandi GitHub : [mywanip.sh](https://github.com/Gandi/api-examples/blob/master/bash/livedns/mywanip.sh)
 
-Cron job to auto update a DNS record when WAN IP changes using Gandi Live DNS API on Debian GNU/Linux

etc/cron.d/live-dns-update

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+# /etc/cron.d/live-dns-update crontab fragment for updating
+#  DNS zone records with WAN IP address
+
+12,42 *     * * *     root   bash /usr/local/bin/live-dns-update.sh

etc/live-dns/live-dns.conf

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+DOMAIN="domain.tld"
+RECORD="host"
+APIKEY="Your-API-Key"

install.sh

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+#!/bin/bash 
+
+cp usr/local/bin/live-dns-update.sh /usr/local/bin/live-dns-update.sh
+chmod +x /usr/local/bin/live-dns-update.sh
+
+mkdir /etc/live-dns
+cp etc/live-dns/live-dns.conf /etc/live-dns/live-dns.conf
+chmod 400 /etc/live-dns/live-dns.conf
+
+cp etc/cron.d/live-dns-update /etc/cron.d/live-dns-update
+

usr/local/bin/live-dns-update.sh

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+#!/bin/bash
+#
+# Updates DNS zone records using Gandi's LiveDNS API.
+# Before you use this script you need to configure record details and API key in 
+# the file `/etc/live-dns/live-dns.conf` 
+#
+# This script is meant to be run by cron.
+# through a crontab placed in /etc/cron.d/live-dns-update
+#
+# This script is based on the sample provided here : 
+# https://github.com/Gandi/api-examples/blob/master/bash/livedns/mywanip.sh
+#
+
+# Include configuration file
+source /etc/live-dns/live-dns.conf
+#echo Domain : $DOMAIN
+#echo Record : $RECORD
+#echo APIKey : $APIKEY
+
+API="https://dns.api.gandi.net/api/v5/"
+IP_SERVICE="http://me.gandi.net"
+
+
+# Get WAN IP as seend from outside
+WAN_IP4=$(curl -s4 $IP_SERVICE)
+WAN_IP6=$(curl -s6 $IP_SERVICE)
+echo WAN IPv4 : $WAN_IP4 | logger
+echo WAN IPv6 : $WAN_IP6 | logger
+
+if [[ -z "$WAN_IP4" && -z "$WAN_IP6" ]]; then
+    echo "Something went wrong. Can not get your IP from $IP_SERVICE " | logger
+    exit 1
+fi
+
+# Get IP from DNS
+DNS_IP4=$(dig +short @ns1.gandi.net -t A $RECORD.$DOMAIN)
+DNS_IP6=$(dig +short @ns1.gandi.net -t AAAA $RECORD.$DOMAIN)
+
+echo DNS IPv4 : $DNS_IP4 | logger
+echo DNS IPv6 : $DNS_IP6 | logger
+
+# Update IPV4 DNS record if IP adresses mismatch
+if [[ ! -z "$WAN_IP4" ]]; then
+  if [[ "$WAN_IP4" != "$DNS_IP4" ]]
+  then
+    echo Updating IPv4 DNS records for $RECORD.$DOMAIN | logger
+    DATA='{"rrset_values": ["'$WAN_IP4'"]}'
+    IP4_RES=$(curl -s -XPUT -d "$DATA" \
+        -H"X-Api-Key: $APIKEY" \
+        -H"Content-Type: application/json" \
+        "$API/domains/$DOMAIN/records/$RECORD/A" 2>&1)
+    echo Update of IPv4 DNS record : $IP4_RES | logger
+  else
+    echo No need to update IPv4 DNS record for $RECORD.$DOMAIN | logger
+  fi
+fi
+
+
+# Update IPV6 DNS record if IP adresses mismatch
+if [[ ! -z "$WAN_IP6" ]]; then
+  if [[ "$WAN_IP6" != "$DNS_IP6" ]]
+  then
+    echo Updating IPv6 DNS records for $RECORD.$DOMAIN | logger
+    DATA='{"rrset_values": ["'$WAN_IP6'"]}'
+    IP6_RES=$(curl -s -XPUT -d "$DATA" \
+        -H"X-Api-Key: $APIKEY" \
+        -H"Content-Type: application/json" \
+        "$API/domains/$DOMAIN/records/$RECORD/AAAA" 2>&1)
+    echo Update of IPv6 DNS record : $IP6_RES | logger
+  else
+    echo No need to update IPv6 DNS record for $RECORD.$DOMAIN | logger
+  fi
+fi