1 files changed, 92 insertions, 0 deletions
diff --git a/dehydrated/bin/dehydrated-nsupdate b/dehydrated/bin/dehydrated-nsupdate
new file mode 100755
index 0000000..f901d2e
--- /dev/null
+++ b/dehydrated/bin/dehydrated-nsupdate
@@ -0,0 +1,92 @@
+#!/bin/sh
+
+set -e
+
+HOOK="$(basename "${0}")"
+HOOK_ACTION="$(echo "${HOOK}" | awk -F. '{ print $1 }')"
+
+# set nsupdate action
+case "${HOOK}" in
+	clean_challenge.*)
+		HOOK_ACTION="delete"
+		;;
+
+	deploy_challenge.*)
+		HOOK_ACTION="add"
+		;;
+
+	*)
+		echo "'${HOOK}': no such hook action '${HOOK_ACTION}'" >&2
+		echo "'${HOOK}': use 'clean_challenge.' or 'deploy_challenge.' as prefix in your symlink" >&2
+		exit 1
+		;;
+esac
+
+# alternatives handling for dig
+if command -v kdig > /dev/null 2>&1
+then
+	# knot-dnsutils
+	DIG="kdig"
+elif command -v dig > /dev/null 2>&1
+then
+	# bind-dnsutils
+	DIG="dig"
+else
+	echo "'${HOOK}': need dig from bind-dnsutils or knot-dnsutils" >&2
+	exit 1
+fi
+
+# alternatives handling for nsupdate
+if command -v knsupdate > /dev/null 2>&1
+then
+	# knot-dnsutils
+	NSUPDATE="knsupdate"
+elif command -v nsupdate > /dev/null 2>&1
+then
+	# bind-dnsutils
+	NSUPDATE="nsupdate"
+else
+	echo "'${HOOK}': need nsupdate from bind-dnsutils or knot-dnsutils" >&2
+	exit 1
+fi
+
+# find txt record to update
+CNAME="$(${DIG} "_acme-challenge.${DOMAIN}" 2>&1 | awk '/CNAME/ { print $5 }' | tail -n1)"
+
+if [ -n "${CNAME}" ]
+then
+	UPDATE_DOMAIN="${CNAME}"
+else
+	UPDATE_DOMAIN="_acme-challenge.${DOMAIN}"
+fi
+
+# find nameservers to update
+ZONE="${UPDATE_DOMAIN}"
+
+while true
+do
+	NAMESERVERS="$(${DIG} NS "${ZONE}" 2>&1 | awk '/NS/ { print $5 }' | tail -n1)"
+
+	if [ -n "${NAMESERVERS}" ]
+	then
+		break
+	else
+		ZONE="$(echo "${ZONE}" | cut -d '.' -f 2-)"
+	fi
+done
+
+NAMESERVERS="$(${DIG} +short NS "${ZONE}")"
+
+# update nameservers
+for NAMESERVER in ${NAMESERVERS}
+do
+	echo -n " + Adding TXT record (${UPDATE_DOMAIN})..."
+
+echo "server ${NAMESERVER}
+zone ${ZONE}
+ttl 0
+update ${HOOK_ACTION} ${UPDATE_DOMAIN} 0 TXT ${TOKEN_VALUE}
+send" | "${NSUPDATE}"
+
+	echo " done."
+done