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#!/bin/bash
#Variable Declaration - Change These
HOSTED_ZONE_ID="XXXXXXXX"
NAME="example.com."
TYPE="A"
TTL=60
#get current IP address
IP=$(curl http://checkip.amazonaws.com/)
#validate IP address (makes sure Route 53 doesn't get updated with a malformed payload)
if [[ ! $IP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
exit 1
fi
#get current
aws2 route53 list-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID | \
jq -r '.ResourceRecordSets[] | select (.Name == "'"$NAME"'") | select (.Type == "'"$TYPE"'") | .ResourceRecords[0].Value' > /tmp/current_route53_value
cat /tmp/current_route53_value
#check if IP is different from Route 53
if grep -Fxq "$IP" /tmp/current_route53_value; then
echo "IP Has Not Changed, Exiting"
exit 1
fi
echo "IP Changed, Updating Records"
#prepare route 53 payload
cat > /tmp/route53_changes.json << EOF
{
"Comment":"Updated From DDNS Shell Script",
"Changes":[
{
"Action":"UPSERT",
"ResourceRecordSet":{
"ResourceRecords":[
{
"Value":"$IP"
}
],
"Name":"$NAME",
"Type":"$TYPE",
"TTL":$TTL
}
}
]
}
EOF
#update records
aws2 route53 change-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID --change-batch file:///tmp/route53_changes.json >> /dev/null
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