Bash script to update CloudFlare DNS record. Required credentials: DNS zone id, API token.

update-cf-dns.sh

#!/bin/bash

if [ -z "$1" -o -z "$2" -o -z "$3" -o -z "$4" ]; then
	echo "Usage: $0 <zone id> <auth token> <dns record name> <value> [proxied true|false (default: false)] [dns record type (default: A)] [ttl(default: 1=auto)]"
	exit 1
fi

type curl > /dev/null && type jq > /dev/null || { echo "curl or jq not found"; exit 1; }

ZONE_ID="$1"
TOKEN="$2"
NAME="$3"
CONTENT="$4"
PROXIED="${5:-false}"
TYPE="${6:-A}"
TTL="${7:-1}"

RECORD_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/" -H "Authorization: Bearer $TOKEN" | jq -r ".result[] | select(.name == \"$NAME\") | .id")

if [ -z "$RECORD_ID" ]; then
	echo "DNS record does not exist, creating a new one"
	curl -s -X POST \
		"https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/" \
		-H "Authorization: Bearer $TOKEN" \
		-H "Content-Type: application/json" \
		--data '{"type":"'"$TYPE"'","name":"'"$NAME"'","content":"'"$CONTENT"'","proxied":'"$PROXIED"',"ttl":'"$TTL"'}' \
		| jq
else
	echo "DNS record exists: id=$RECORD_ID. Updating"
	curl -s -X PATCH \
		"https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
		-H "Authorization: Bearer $TOKEN" \
		-H "Content-Type: application/json" \
		--data '{"type":"'"$TYPE"'","name":"'"$NAME"'","content":"'"$CONTENT"'","proxied":'"$PROXIED"',"ttl":'"$TTL"'}' \
		| jq
fi