add firewall rules with a rules handler, setup command fix and rust server

utils/setup-ports.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+run() {
+  echo "$@"
+  "$@"
+}
+
+up() {
+  while read -r line; do
+    [ -z "$line" ] && continue
+    if [ "$(echo "$line" | cut -c1)" = "#" ]; then
+      echo "$line"
+    else
+      # shellcheck disable=SC2086
+      run iptables -A $line
+    fi
+  done < "$1"
+}
+
+down() {
+  while read -r line; do
+    [ -z "$line" ] && continue
+    if [ "$(echo "$line" | cut -c1)" = "#" ]; then
+      echo "$line"
+    else
+      # shellcheck disable=SC2086
+      run iptables -D $line
+    fi
+  done < "$1"
+}
+
+case "$1" in
+  up)
+    up "$2"
+    ;;
+  down)
+    down "$2"
+    ;;
+  *)
+    echo "Usage: $0 {up|down}"
+    exit 1
+esac