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#!/bin/bash
##
## Update a Route53 record with this host's IP addresses.
##
## $DIR/.dyndns/config should contain something like:
## ZONEID="AWS_ZONE_ID"
## TTL=60
## ENABLE_IP6=true
## ENABLE_IP4=false
##
## Adapted from https://willwarren.com/2014/07/03/roll-dynamic-dns-service-using-amazon-route53/
##
DIR=$HOME/.dyndns
if [ ! -f $DIR/config ]; then
echo "Config is missing. Exiting."
exit 1
fi
source $DIR/config
RECORDSET=$(hostname --fqdn)
COMMENT="Auto updating @ `date`"
IP4=$(dig +short myip.opendns.com @resolver1.opendns.com)
IP6=$((ip -6 addr list|grep inet6|grep global|grep -v temporary|awk '{print $2}'; ip -6 addr list|grep inet6|grep global|grep temporary|awk -F '{print $2}')|head -n1|cut -d/ -f1)
function valid_ip4()
{
local ip=$1
local stat=1
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
OIFS=$IFS
IFS='.'
ip=($ip)
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
stat=$?
fi
return $stat
}
function update_dns() {
local IP=$1
local TYPE=$2
local TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX)
cat > ${TMPFILE} << EOF
{
"Comment":"$COMMENT",
"Changes":[
{
"Action":"UPSERT",
"ResourceRecordSet":{
"ResourceRecords":[
{
"Value":"$IP"
}
],
"Name":"$RECORDSET",
"Type":"$TYPE",
"TTL":$TTL
}
}
]
}
EOF
# Update the Hosted Zone record
aws route53 change-resource-record-sets \
--hosted-zone-id $ZONEID \
--change-batch file://"$TMPFILE"
ret="$?"
echo
# Clean up
rm $TMPFILE
return $ret
}
IP4FILE="$DIR/ip4"
IP6FILE="$DIR/ip6"
# IPv4
if $ENABLE_IP4 && valid_ip4 $IP4; then
touch "$IP4FILE"
if grep -Fxq "$IP4" "$IP4FILE"; then
echo "IP is still $IP4. Skipping."
else
echo "IP4 has changed to $IP4"
update_dns $IP4 A && echo "$IP4" > "$IP4FILE"
fi
fi
# IPv6
if $ENABLE_IP6 && [ -n "$IP6" ]; then
touch "$IP6FILE"
if grep -Fxq "$IP6" "$IP6FILE"; then
echo "IP is still $IP6. Skipping."
else
echo "IP6 has changed to $IP6"
update_dns $IP6 AAAA && echo "$IP6" > "$IP6FILE"
fi
fi
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