106 lines
2.3 KiB
Plaintext
106 lines
2.3 KiB
Plaintext
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#!/bin/bash
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function route53-set-record () {
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# (optional) You might need to set your PATH variable at the top here
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# depending on how you run this script
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# PATH=PATH
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# Hosted Zone ID e.g. BJBK35SKMM9OE
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ZONEID="ZF04FGKB9QHN2"
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# The CNAME you want to update e.g. hello.example.com
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RECORDSET="238.kebler.net"
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# More advanced options below
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# The Time-To-Live of this recordset
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TTL=300
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# Change this if you want
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COMMENT="Auto updating @ `date`"
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# Change to AAAA if using an IPv6 address
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TYPE="A"
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# Get the external IP address from OpenDNS (more reliable than other providers)
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IP=`dig +short myip.opendns.com @resolver1.opendns.com`
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echo current ip is $IP
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# Get current dir
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# (from http://stackoverflow.com/a/246128/920350)
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# DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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DIR=$HOME
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LOGFILE="$DIR/update-route53.log"
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IPFILE="$DIR/update-route53.ip"
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if ! valid_ip $IP; then
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echo "Invalid IP address: $IP" >> "$LOGFILE"
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exit 1
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fi
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# Check if the IP has changed
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if [ ! -f "$IPFILE" ]
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then
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touch "$IPFILE"
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fi
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if grep -Fxq "$IP" "$IPFILE"; then
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# code if found
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echo "IP is still $IP. Exiting" >> "$LOGFILE"
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exit 0
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else
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echo "IP has changed to $IP" >> "$LOGFILE"
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# Fill a temp file with valid JSON
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TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX)
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cat > ${TMPFILE} << EOF
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{
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"Comment":"$COMMENT",
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"Changes":[
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{
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"Action":"UPSERT",
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"ResourceRecordSet":{
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"ResourceRecords":[
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{
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"Value":"$IP"
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}
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],
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"Name":"$RECORDSET",
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"Type":"$TYPE",
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"TTL":$TTL
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}
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}
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]
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}
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EOF
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# Update the Hosted Zone record
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aws route53 change-resource-record-sets \
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--hosted-zone-id $ZONEID \
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--change-batch file://"$TMPFILE" >> "$LOGFILE"
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echo "IP Changed in Route53" >> "$LOGFILE"
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# Clean up
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rm $TMPFILE
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fi
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# All Done - cache the IP address for next time
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echo "$IP" > "$IPFILE"
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}
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# end function
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function valid_ip()
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{
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local ip=$1
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local stat=1
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if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
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OIFS=$IFS
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IFS='.'
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ip=($ip)
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IFS=$OIFS
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[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
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&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
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stat=$?
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fi
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return $stat
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}
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