From ebfd7fbc3a8c22d5ba092b239e34f790847ef745 Mon Sep 17 00:00:00 2001
From: Salt <rehashedsalt@cock.li>
Date: Fri, 15 Oct 2021 19:17:13 -0500
Subject: [PATCH] Add check_ping_by_hostname

---
 check_ping_by_hostname | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100755 check_ping_by_hostname

diff --git a/check_ping_by_hostname b/check_ping_by_hostname
new file mode 100755
index 0000000..ae35854
--- /dev/null
+++ b/check_ping_by_hostname
@@ -0,0 +1,38 @@
+#!/bin/bash
+#
+# check_ping_by_hostname
+#
+# Attempts to resolve the name for and ping ourselves based on the device's
+# hostname.
+#
+
+name="$HOSTNAME"
+
+# Ensure $name is available
+if [ -z "$name" ]; then
+	echo "CRITICAL: No hostname(?!)"
+	exit 2
+fi
+
+# Ensure we have the tools we need
+for cmd in dig ping; do
+	if ! command -v "$cmd" > /dev/null 2>&1; then
+		echo "UNKNOWN: Missing command for check: $cmd"
+		exit 3
+	fi
+done
+
+# Ensure we can dig ourselves
+if [ -z "$(dig +short "$name")" ]; then
+	echo "CRITICAL: Could not resolve hostname or found empty record: $name"
+	exit 2
+fi
+
+# Ping ourselves
+if ! ping "$name" -c 1 > /dev/null 2>&1; then
+	echo "CRITICAL: Could not ping self"
+	exit 2
+else
+	echo "OK"
+	exit 0
+fi