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A bash script to update a Cloudflare DNS A record with the external IP of the source machine
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#!/bin/bash | |
# A bash script to update a Cloudflare DNS A record with the external IP of the source machine | |
# Used to provide DDNS service for my home | |
# Needs the DNS record pre-creating on Cloudflare | |
# Proxy - uncomment and provide details if using a proxy | |
#export https_proxy=http://<proxyuser>:<proxypassword>@<proxyip>:<proxyport> | |
# Cloudflare zone is the zone which holds the record | |
zone=example.com | |
# dnsrecord is the A record which will be updated | |
dnsrecord=www.example.com | |
## Cloudflare authentication details | |
## keep these private | |
[email protected] | |
cloudflare_auth_key=1234567890abcdef1234567890abcdef | |
# Get the current external IP address | |
ip=$(curl -s -X GET https://checkip.amazonaws.com) | |
echo "Current IP is $ip" | |
if host $dnsrecord 1.1.1.1 | grep "has address" | grep "$ip"; then | |
echo "$dnsrecord is currently set to $ip; no changes needed" | |
exit | |
fi | |
# if here, the dns record needs updating | |
# get the zone id for the requested zone | |
zoneid=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone&status=active" \ | |
-H "X-Auth-Email: $cloudflare_auth_email" \ | |
-H "X-Auth-Key: $cloudflare_auth_key" \ | |
-H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id') | |
echo "Zoneid for $zone is $zoneid" | |
# get the dns record id | |
dnsrecordid=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records?type=A&name=$dnsrecord" \ | |
-H "X-Auth-Email: $cloudflare_auth_email" \ | |
-H "X-Auth-Key: $cloudflare_auth_key" \ | |
-H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id') | |
echo "DNSrecordid for $dnsrecord is $dnsrecordid" | |
# update the record | |
curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records/$dnsrecordid" \ | |
-H "X-Auth-Email: $cloudflare_auth_email" \ | |
-H "X-Auth-Key: $cloudflare_auth_key" \ | |
-H "Content-Type: application/json" \ | |
--data "{\"type\":\"A\",\"name\":\"$dnsrecord\",\"content\":\"$ip\",\"ttl\":1,\"proxied\":false}" | jq |
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