computer made a thing

healthcheck.sh

@@ -0,0 +1,56 @@
+#!/bin/sh
+# healthcheck.sh — RouterOS container health check for mdns-reflector
+#
+# Returns 0 (healthy) if:
+#   1. Health file exists and is younger than 30 seconds
+#   2. mdns-repeater process is running
+#   3. At least one interface socket is alive
+#
+# Returns 1 (unhealthy) otherwise.
+
+HEALTH_FILE="/tmp/mdns-health"
+
+# 1. Check health file exists
+if [ ! -f "$HEALTH_FILE" ]; then
+    echo "unhealthy: no health file"
+    exit 1
+fi
+
+# 2. Check health file freshness (must be < 30s old)
+now=$(date +%s)
+file_ts=$(awk -F= '/^ts=/{print $2}' "$HEALTH_FILE" 2>/dev/null)
+if [ -z "$file_ts" ]; then
+    echo "unhealthy: no timestamp in health file"
+    exit 1
+fi
+
+age=$((now - file_ts))
+if [ "$age" -gt 30 ]; then
+    echo "unhealthy: health file stale (${age}s old)"
+    exit 1
+fi
+
+# 3. Check process is running
+pid=$(pidof mdns-repeater 2>/dev/null)
+if [ -z "$pid" ]; then
+    echo "unhealthy: mdns-repeater not running"
+    exit 1
+fi
+
+# 4. Check at least one interface has a socket (fd4 or fd6 open)
+n_ifaces=$(awk -F= '/^n_ifaces=/ {print $2}' "$HEALTH_FILE" 2>/dev/null)
+if [ -z "$n_ifaces" ] || [ "$n_ifaces" -eq 0 ]; then
+    echo "unhealthy: no interfaces configured"
+    exit 1
+fi
+
+# 5. Verify sockets are actually bound to port 5353
+ss -lupn 2>/dev/null | grep -q ":5353"
+if [ $? -ne 0 ]; then
+    echo "unhealthy: no UDP socket on port 5353"
+    exit 1
+fi
+
+echo "healthy: ${n_ifaces} interfaces, age=${age}s"
+exit 0
+