initial

examples/wireguard/FE_wireguard_dnat.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# FE (f0xx-monstro): DNAT public UDP → BE wg0. Matches existing rules to 10.7.16.128 (8088, etc.).
+# Invoked from xen_firewall.sh start/stop; also: wireguard_fe_dnat.sh [start|stop]
+set -euo pipefail
+
+BE_IP="${BE_IP:-10.7.16.128}"
+WG_PORT="${WG_PORT:-45340}"
+
+function start() {
+  if iptables -t nat -C PREROUTING -p udp --dport "$WG_PORT" -j DNAT --to-destination "${BE_IP}:${WG_PORT}" 2>/dev/null; then
+    echo "DNAT rule already present for udp/${WG_PORT}"
+  else
+    iptables -t nat -A PREROUTING -p udp --dport "$WG_PORT" -j DNAT --to-destination "${BE_IP}:${WG_PORT}"
+    echo "Added PREROUTING DNAT udp/${WG_PORT} -> ${BE_IP}:${WG_PORT}"
+  fi
+
+  if iptables -C FORWARD -p udp -d "${BE_IP}" --dport "$WG_PORT" -j ACCEPT 2>/dev/null; then
+    echo "FORWARD rule already present"
+  else
+    iptables -A FORWARD -p udp -d "${BE_IP}" --dport "$WG_PORT" -j ACCEPT
+    echo "Added FORWARD udp -> ${BE_IP}:${WG_PORT}"
+  fi
+}
+
+function stop() {
+  if iptables -t nat -C PREROUTING -p udp --dport "$WG_PORT" -j DNAT --to-destination "${BE_IP}:${WG_PORT}" 2>/dev/null; then
+    iptables -t nat -D PREROUTING -p udp --dport "$WG_PORT" -j DNAT --to-destination "${BE_IP}:${WG_PORT}"
+    echo "Removed PREROUTING DNAT udp/${WG_PORT}"
+  else
+    echo "DNAT rule not present for udp/${WG_PORT}"
+  fi
+
+  if iptables -C FORWARD -p udp -d "${BE_IP}" --dport "$WG_PORT" -j ACCEPT 2>/dev/null; then
+    iptables -D FORWARD -p udp -d "${BE_IP}" --dport "$WG_PORT" -j ACCEPT
+    echo "Removed FORWARD udp -> ${BE_IP}:${WG_PORT}"
+  else
+    echo "FORWARD rule not present"
+  fi
+}
+
+cmd=$1
+cmd=${cmd:-start}
+[ "$cmd" = "start" ] && start || stop