Auto update a Cloudflare DNS record with your public IP (DDNS)

ddns_with_cloudflare.sh

#!/bin/sh
#
# Made with several bits from the same amount of other scripts...
# ping me if you need: Tiago Carrondo <tcarrondo@ubuntu.com>
#
# cron this file every 5 min or so...
# */5 * * * * /root/ddns_with_cloudflare.sh 2>&1 | /usr/bin/logger -t ddns_with_cloudflare

# account credentials
CLOUDFLARE_EMAIL='<cloudflare e-mail address>'
CLOUDFLARE_API_KEY='<api key>'

# zone information
DNS_ZONE_ID='<get this value via web panel>'

# record information
DNS_RECORD_ID='<get this value with the code below>'
DNS_RECORD_NAME='<fqdn of the ddns destination>'
DNS_RECORD_TYPE='A'

# public ip information
NEW_IP=`curl http://ifconfig.me/ip`
CURRENT_IP=`cat /var/tmp/current_ip.txt`

# Uncomment the lines below to get the DNS_RECORD_NAME value
# curl -cs -X GET "https://api.cloudflare.com/client/v4/zones/$DNS_ZONE_ID/dns_records?type=A&name=$DNS_RECORD_NAME" \" \
#		-H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
#		-H "X-Auth-Key: $CLOUDFLARE_API_KEY"

touch /var/tmp/current_ip.txt

if [ "$NEW_IP" = "$CURRENT_IP" ]
then
  echo "No Change in IP Adddress"
else
  curl -X PUT "https://api.cloudflare.com/client/v4/zones/$DNS_ZONE_ID/dns_records/$DNS_RECORD_ID" \
  -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
  -H "X-Auth-Key: $CLOUDFLARE_API_KEY" \
  -H "Content-Type: application/json" \
  --data "{\"type\":\"$DNS_RECORD_TYPE\",\"name\":\"$DNS_RECORD_NAME\",\"content\":\"$NEW_IP\"}"
  echo $NEW_IP > /var/tmp/current_ip.txt
fi