cloudflare ddns

gistfile1.txt

#!/bin/bash

# this is a simple script, it will curl to get your current ipv4 ip (change from ipv4 to ipv6 and A to AAAA to do this for ipv6)
# compare to what is set at cloudflare, and then update the record if needed. unlike most scripts you'll find, this does NOT
# use the global key. You need DNS::Edit for your api key.
# the record ID may not be needed, but this is how I set this up, maybe ill edit later

DOMAIN="<put the record you want to update here>"
NEWIP=$(host $DOMAIN| grep address | awk '{ print $4 }')
CURRIP=$(curl -s ipv4.icanhazip.com)
APIKEY="<put your api key with DNS::Edit here>"
ZONEID="<put your cloudflare domain's zone id here>"
RECORDID="<put the record id of the record you want to update here>"
TYPE="<the record type>"

if ! diff -q <( printf $NEWIP ) <( printf $CURRIP )>/dev/null 2>&1
then
  echo "Different IP, updating..."
  curl -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONEID/dns_records/$RECORDID" \
     -H "Authorization: Bearer $APIKEY" \
     -H "Content-Type: application/json" \
     --data "{\"type\":\"A\",\"name\":\"$DOMAIN\",\"content\":\"$NEWIP\",\"ttl\":3600,\"proxied\":false}"
else
  echo "No changes needed..."
fi

you can get record IDs by using
curl -X GET "https://api.cloudflare.com/client/v4/zones/<your zone>/dns_records?type=<the record type you want to see (like A or AAAA)>" -H "Authorization: Bearer <your token with at least DNS::READ>" -H "Content-Type:application/json"