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@ukn
Created January 27, 2020 20:56
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Update Cloudflare A record when your IP changes
#!/bin/bash
# Updates Cloudflare dns record
# when your home IP changes
# Put in in cron with desired frequency
# but don't abuse WTF service (they throttle anyway)
set -e
API_TOKEN=YOUR_API_TOKEN_HERE
ZONE=$1
DNS_ID=$2
DNS_NAME=$3
if [[ $# -lt 3 ]]; then
echo "Not enough arguments"
exit 1
fi
getip() {
IP=`curl -sL https://wtfismyip.com/text`
OLDIP=`cat ./${DNS_NAME}-old.ip`
}
logger() {
echo `date +%Y:%H:%M:%S` $1 >> ./${DNS_NAME}.log
}
getip
if [ "$IP" ]; then
if [ "$OLDIP" != "$IP" ]; then
logger "Old IP: $OLDIP => New IP: $IP"
curl --silent -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE/dns_records/$DNS_ID" \
-H "Authorization: Bearer $API_TOKEN" \
-H "Content-Type: application/json" \
--data "{\"type\":\"A\",\"name\":\"${DNS_NAME}\",\"content\":\"${IP}\",\"proxied\":true}" \
&& echo -n "$IP" > ./${DNS_NAME}-old.ip && logger "IP updated to $IP" \
|| logger "Couldn't update IP"
fi
else
logger "Could not get IP from wtf"
fi
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