Cloudflare as Dynamic DNS

lwp-cloudflare-dyndns.sh

#!/bin/bash
# Cloudflare as Dynamic DNS
# From: https://letswp.io/cloudflare-as-dynamic-dns-raspberry-pi/
# Based on: https://gist.github.com/benkulbertis/fff10759c2391b6618dd/
# Original non-RPi article: https://phillymesh.net/2016/02/23/setting-up-dynamic-dns-for-your-registered-domain-through-cloudflare/

# Update these with real values
auth_email="[email protected]"
auth_key="global_api_key_goes_here" 
zone_name="example.com"
record_name="home.example.com"

# Don't touch these
ip=$(curl -s http://ipv4.icanhazip.com)
ip_file="ip.txt"
id_file="cloudflare.ids"
log_file="cloudflare.log"

# Keep files in the same folder when run from cron
current="$(pwd)"
cd "$(dirname "$(readlink -f "$0")")"

log() {
    if [ "$1" ]; then
        echo -e "[$(date)] - $1" >> $log_file
    fi
}

log "Check Initiated"

if [ -f $ip_file ]; then
    old_ip=$(cat $ip_file)
    if [ $ip == $old_ip ]; then
        log "IP has not changed."
        exit 0
    fi
fi

if [ -f $id_file ] && [ $(wc -l $id_file | cut -d " " -f 1) == 2 ]; then
    zone_identifier=$(head -1 $id_file)
    record_identifier=$(tail -1 $id_file)
else
    zone_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*' | head -1 )
    record_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json"  | grep -Po '(?<="id":")[^"]*')
    echo "$zone_identifier" > $id_file
    echo "$record_identifier" >> $id_file
fi

update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\"}")

if [[ $update == *"\"success\":false"* ]]; then
    message="API UPDATE FAILED. DUMPING RESULTS:\n$update"
    log "$message"
    echo -e "$message"
    exit 1 
else
    message="IP changed to: $ip"
    echo "$ip" > $ip_file
    log "$message"
    echo "$message"
fi

Not sure what old me had issues with, but just did this again and it worked. I don't even remember posting that comment. Blimey.

I still use the script to this day, still on RPI, and it works fine. The only thing that will break it is when Cloudflare changes their API, to which we could react.

@tarasis I wish i could talk to 'old you' because i am getting that same error. as you.

Getting: API UPDATE FAILED. DUMPING RESULTS: {"success":false,"errors":[{"code":7003,"message":"Could not route to /zones/dns_records, perhaps your object identifier is invalid?"},{"code":7000,"message":"No route for that URI"}],"messages":[],"result":null}

Any idea? It is an account with multiple domains.

Hiya... did you ever get this to work?

I implemented logrotate. This will rotate the log files each day for 7 days before deleting the oldest one. Then you don't have a giant growing log file for eternity. Before running the program:

sudo mkdir /var/log/cloudflare
sudo chown $USER:$USER /var/log/cloudflare/
touch /var/log/cloudflare/cloudflare.log
nano /etc/logrotate.d/cloudflare

Enter in /etc/logrotate.d/cloudflare file:

/var/log/cloudflare/cloudflare.log {
	rotate 7
	daily
}

Save the file. Then change directory back to where this script (lwp-cloudflare-dyndns.sh) is located. For me, ~/cloudflare. Finally:
ln -s cloudflare.log /var/log/cloudflare/cloudflare.log