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Cloudflare API v4 Dynamic DNS Update in Bash
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#!/bin/bash | |
# CHANGE THESE | |
auth_email="user@example.com" | |
auth_key="c2547eb745079dac9320b638f5e225cf483cc5cfdda41" # found in cloudflare account settings | |
zone_name="example.com" | |
record_name="www.example.com" | |
# MAYBE CHANGE THESE | |
ip=$(curl -s http://ipv4.icanhazip.com) | |
ip_file="ip.txt" | |
id_file="cloudflare.ids" | |
log_file="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 |
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