lxd-pdns-pipe.sh

#!/usr/bin/env zsh

IFS=$'\t'
set -e

while
	read -rd $'\t' cmd
do
	case "${cmd}" in
		HELO)
			test "$(line)" != "1" && printf "FAIL\\n" && continue || true
			printf "OK\\t%s\\n" "lxd proxy"
		;;
		Q)
			read -r qname qclass qtype id ip
			printf "LOG\\t%s\\t%s\\t%s\\t%s\\t%s\\n" "${qname}" "${qclass}" "${qtype}" "${id}" "${ip}"
			case "${qtype}" in
				SOA)
					printf "DATA\\t%s\\t%s\\t%s\\t300\\t%s\\t%s\\t%s\\n" \
						"${qname}" "${qclass}" "${qtype}" "${id}" \
						"example.com. example.example.com. 1 86400 7200 3600000 3600"
					printf "END\\n"
				;;
				AAAA|ANY)
					sudo lxc list --format json -- "\\A${qname%%.*}\\z" \
						| jq -r --arg qname "${qname}" --arg qclass "${qclass}" --arg qtype AAAA --arg ttl 4 --arg id "${id}" \
							'.[].state.network.eth0.addresses[]? // empty | select(.family == "inet6" and .scope == "global") | ["DATA",$qname,$qclass,$qtype,$ttl,$id,.address] | @tsv'
					printf "END\\n"
				;;
				*)
					printf "FAIL\\n"
				;;
			esac
		;;
		*)
			line > /dev/null
			printf "FAIL\\n"
		;;
	esac
done