From a01c87416b241315a9268bb4eb5206ade8328069 Mon Sep 17 00:00:00 2001
From: David Timber <dxdt@dev.snart.me>
Date: Wed, 27 Apr 2022 17:40:41 +0800
Subject: Initial commit

---
 src/palhm-dnssec-check.sh | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100755 src/palhm-dnssec-check.sh

(limited to 'src/palhm-dnssec-check.sh')

diff --git a/src/palhm-dnssec-check.sh b/src/palhm-dnssec-check.sh
new file mode 100755
index 0000000..f5ee466
--- /dev/null
+++ b/src/palhm-dnssec-check.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+set -e
+. "$( dirname -- "${BASH_SOURCE[0]}" )"/common.sh
+
+do_query () {
+	# dig returns 0 upon successful reception and parse of the response message.
+	# All the other exit codes other than 0 will cause the script to terminate
+	# as a result of set -e. +short option makes dig return the values of RR.
+	# We assume that a status code has returned when dig produces no output with
+	# the option. Caution must be taken in this approach as zones with no
+	# record will also return nothing with the status code zero.
+	dig +short +dnssec ANY "$TARGET" > "$tmpf"
+	if [ ! -s "$tmpf" ]; then
+		palhm_die \
+			"The nameserver returned no RR!
+DNSSEC verification probably failed."
+	fi
+}
+
+if [ "$#" -lt 1 ]; then
+	cat >&2 << EOF
+The Periodic Automatic Linux Host Maintenance (PALHM) DNSSEC check
+Usage: $0 <record name>
+
+The zone must contain at least one resource record set. The nameservers
+configured for the host must support DNSSEC validation.
+
+To test your host configuration, running
+  \$ $0 dnssec-failed.org
+should produce error messages.
+EOF
+	exit 2
+fi
+
+declare TARGET="$1"
+declare tmpf="$(mktemp --tmpdir "palhm-dnssec.XXXXXXXXXX")"
+
+do_query & set +e
+wait -f "$!"
+ec="$?"
+rm "$tmpf"
+
+exit "$ec"
-- 
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