update cloud flare DNS with home IP

cloudflare-update-record.sh

#!/bin/bash

#https://gist.github.com/benkulbertis/fff10759c2391b6618dd

# Place at:
# /usr/local/bin/cf-ddns.sh
# run `crontab -e` and add next line:
# 0 */5 * * * * /usr/local/bin/cf-ddns.sh >/dev/null 2>&1
 
# CHANGE THESE
auth_email="[email protected]"
auth_key="hexkey" # found in cloudflare account settings
zone_name="domainname.com"
record_name="namic.domainname.com"
 
# MAYBE CHANGE THESE
ip=$(curl -s -4 http://icanhazip.com)
ip_file="/root/ip.txt"
id_file="/root/cloudflare.ids"
log_file="/root/cloudflare.log"
 
# LOGGER
log() {
    if [ "$1" ]; then
        echo -e "[$(date)] - $1" >> $log_file
    fi
}
 
# SCRIPT START
log "Check Initiated"
 
if [ -f $ip_file ]; then
    old_ip=$(cat $ip_file)
    if [ $ip == $old_ip ]; then
        echo "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