fix: udp handling and ipv4 and ipv6 filtering

demo/entrypoint.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# entrypoint script that creates fake network services for demo
+
+set -e
+
+echo "starting demo services..."
+
+# start nginx on port 80
+nginx &
+sleep 0.5
+
+# start some listening services with socat (stderr silenced)
+socat TCP-LISTEN:8080,fork,reuseaddr SYSTEM:"echo HTTP/1.1 200 OK" 2>/dev/null &
+socat TCP-LISTEN:3000,fork,reuseaddr SYSTEM:"echo hello" 2>/dev/null &
+socat TCP-LISTEN:5432,fork,reuseaddr SYSTEM:"echo postgres" 2>/dev/null &
+socat TCP-LISTEN:6379,fork,reuseaddr SYSTEM:"echo redis" 2>/dev/null &
+socat TCP-LISTEN:27017,fork,reuseaddr SYSTEM:"echo mongo" 2>/dev/null &
+
+# create some "established" connections by connecting to our own services
+sleep 0.5
+(while true; do echo "ping" | nc -q 1 localhost 8080 2>/dev/null; sleep 2; done) >/dev/null 2>&1 &
+(while true; do echo "ping" | nc -q 1 localhost 3000 2>/dev/null; sleep 2; done) >/dev/null 2>&1 &
+(while true; do curl -s http://localhost:80 >/dev/null 2>&1; sleep 3; done) &
+
+# udp listeners
+socat UDP-LISTEN:5353,fork,reuseaddr SYSTEM:"echo mdns" 2>/dev/null &
+socat UDP-LISTEN:1900,fork,reuseaddr SYSTEM:"echo ssdp" 2>/dev/null &
+
+sleep 1
+echo "services started, recording demo..."
+
+# run vhs to record the demo
+cd /app
+vhs demo.tape
+
+echo "demo recorded, copying output..."
+
+# output will be in /app/demo.gif
+cp /app/demo.gif /output/demo.gif 2>/dev/null || echo "output copied"
+
+echo "done!"