I am running my NAS at home, and it has the public IP, but the IP will be changed randomly, so I need to bind it to the subdomain in the Cloudflare, so I can visit it even the IP changed. So this shell script is using to update the A Record in the DNS Recording.
The script is post to the github as well
- https://gist.github.com/pjq/80fb9444a623b9540b0a48a14f202a41
#!/bin/bash
# CHANGE THESE
auth_email="[email protected]"
auth_key="xxxxxxxx" # found in cloudflare account settings
zone_name="xxxxx"
sub_domains=("sub1" "sub2")
zone_id="your_zone_id"
# MAYBE CHANGE THESE
export HTTP_PROXY=""
export HTTPS_PROXY=""
ip_file="ip.txt"
log_file="cloudflare.log"
# Fetch IP Address
get_ip() {
curl --noproxy '*' -s http://ipv4.icanhazip.com
}
# Log function for output and date
log() {
if [ "$1" ]; then
echo -e "[$(date)] - $1" >> $log_file
fi
}
# Check for changes in IP
check_ip() {
local ip=$1
if [ ${ip} == "165.227.51.176" ];then
log "It's the proxied IP address, exit."
exit 0
fi
if [ -f $ip_file ]; then
old_ip=$(cat $ip_file)
if [ $ip == $old_ip ]; then
log "IP has not changed."
exit 0
fi
fi
}
# Modified get_identifiers function to handle separate identifier files for each subdomain
get_identifiers() {
local sub_domain=$1
local id_file="${sub_domain}_cloudflare.ids" # Separate file for each subdomain
local record_name="${sub_domain}.${zone_name}"
local zone_identifier=
local record_identifier=
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 "Authorization: Bearer $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*' | head -1 )
record_identifier=$(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 "Authorization: Bearer $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*')
echo "$zone_identifier" > $id_file
echo "$record_identifier" >> $id_file
fi
log "Fetched identifiers for $sub_domain - Zone ID: $zone_identifier, Record ID: $record_identifier"
echo $zone_identifier $record_identifier
}
# Update Cloudflare record
update_record() {
local zone_identifier=$1
local record_identifier=$2
local ip=$3
local sub_domain=$4
local record_name="${sub_domain}.${zone_name}"
update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" -H "X-Auth-Email: $auth_email" -H "Authorization: Bearer $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\"}")
if [[ $update == *"\"success\":false"* ]]; then
message="API UPDATE FAILED for $sub_domain. DUMPING RESULTS:\n$update"
log "$message"
echo -e "$message"
exit 1
else
message="IP changed to: $ip for $sub_domain"
echo "$ip" > $ip_file
log "$message"
echo "$message"
fi
}
# Script execution starts here
log "Check Initiated"
ip=$(get_ip)
check_ip $ip
for sub_domain in "${sub_domains[@]}"; do
log "Processing $sub_domain"
identifiers=($(get_identifiers $sub_domain))
update_record ${identifiers[0]} ${identifiers[1]} $ip $sub_domain
done
Cloudflare ddns update shell script