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README.md
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README.md
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# gandi-dynamic-dns
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# Gandi Dynamic DNS
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Cron job to auto update a DNS record when WAN IP changes using Gandi Live DNS API on Debian GNU/Linux
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## To install
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```
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git clone https://gitlab.com/lab.8916100448256/gandi-dynamic-dns.git ./gandi-dynamic-dns
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cd ./gandi-dynamic-dns
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sudo bash ./install.sh
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```
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Then configure DNS record info and API key in file /etc/live-dns/live-dns.conf
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## How it works
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### /etc/cron.d/live-dns-update
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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.
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### /etc/live-dns/live-dns.conf
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Configuration file for the check/update script
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Needs to contains 3 environment variable definitions
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+ DOMAIN="domain.tld" : Replace domain.tld with your domain name
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+ RECORD="host" : Replace host with the sub domain you want to update when WAN IP changes
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+ APIKEY="Your-API-Key" : Replace with you API key generated on the Gandi web interface.
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### /usr/local/bin/live-dns-update.sh
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This the script that is called by the cron job.
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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)
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Cron job to auto update a DNS record when WAN IP changes using Gandi Live DNS API on Debian GNU/Linux
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# /etc/cron.d/live-dns-update crontab fragment for updating
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# DNS zone records with WAN IP address
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12,42 * * * * root bash /usr/local/bin/live-dns-update.sh
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DOMAIN="domain.tld"
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RECORD="host"
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APIKEY="Your-API-Key"
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#!/bin/bash
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cp usr/local/bin/live-dns-update.sh /usr/local/bin/live-dns-update.sh
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chmod +x /usr/local/bin/live-dns-update.sh
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mkdir /etc/live-dns
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cp etc/live-dns/live-dns.conf /etc/live-dns/live-dns.conf
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chmod 400 /etc/live-dns/live-dns.conf
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cp etc/cron.d/live-dns-update /etc/cron.d/live-dns-update
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#!/bin/bash
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#
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# Updates DNS zone records using Gandi's LiveDNS API.
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# Before you use this script you need to configure record details and API key in
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# the file `/etc/live-dns/live-dns.conf`
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#
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# This script is meant to be run by cron.
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# through a crontab placed in /etc/cron.d/live-dns-update
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#
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# This script is based on the sample provided here :
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# https://github.com/Gandi/api-examples/blob/master/bash/livedns/mywanip.sh
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#
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# Include configuration file
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source /etc/live-dns/live-dns.conf
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#echo Domain : $DOMAIN
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#echo Record : $RECORD
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#echo APIKey : $APIKEY
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API="https://dns.api.gandi.net/api/v5/"
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IP_SERVICE="http://me.gandi.net"
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# Get WAN IP as seend from outside
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WAN_IP4=$(curl -s4 $IP_SERVICE)
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WAN_IP6=$(curl -s6 $IP_SERVICE)
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echo WAN IPv4 : $WAN_IP4 | logger
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echo WAN IPv6 : $WAN_IP6 | logger
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if [[ -z "$WAN_IP4" && -z "$WAN_IP6" ]]; then
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echo "Something went wrong. Can not get your IP from $IP_SERVICE " | logger
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exit 1
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fi
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# Get IP from DNS
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DNS_IP4=$(dig +short @ns1.gandi.net -t A $RECORD.$DOMAIN)
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DNS_IP6=$(dig +short @ns1.gandi.net -t AAAA $RECORD.$DOMAIN)
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echo DNS IPv4 : $DNS_IP4 | logger
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echo DNS IPv6 : $DNS_IP6 | logger
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# Update IPV4 DNS record if IP adresses mismatch
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if [[ ! -z "$WAN_IP4" ]]; then
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if [[ "$WAN_IP4" != "$DNS_IP4" ]]
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then
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echo Updating IPv4 DNS records for $RECORD.$DOMAIN | logger
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DATA='{"rrset_values": ["'$WAN_IP4'"]}'
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IP4_RES=$(curl -s -XPUT -d "$DATA" \
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-H"X-Api-Key: $APIKEY" \
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-H"Content-Type: application/json" \
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"$API/domains/$DOMAIN/records/$RECORD/A" 2>&1)
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echo Update of IPv4 DNS record : $IP4_RES | logger
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else
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echo No need to update IPv4 DNS record for $RECORD.$DOMAIN | logger
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fi
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fi
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# Update IPV6 DNS record if IP adresses mismatch
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if [[ ! -z "$WAN_IP6" ]]; then
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if [[ "$WAN_IP6" != "$DNS_IP6" ]]
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then
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echo Updating IPv6 DNS records for $RECORD.$DOMAIN | logger
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DATA='{"rrset_values": ["'$WAN_IP6'"]}'
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IP6_RES=$(curl -s -XPUT -d "$DATA" \
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-H"X-Api-Key: $APIKEY" \
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-H"Content-Type: application/json" \
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"$API/domains/$DOMAIN/records/$RECORD/AAAA" 2>&1)
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echo Update of IPv6 DNS record : $IP6_RES | logger
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else
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echo No need to update IPv6 DNS record for $RECORD.$DOMAIN | logger
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fi
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fi
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