From ec55c5cf3dd3bacc11375d3fe1aed471c7b8cbe8 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Mon, 3 Apr 2023 22:08:47 +0200
Subject: [PATCH] TUN interface

---
 Dockerfile |  1 +
 network.sh | 26 ++++++++++++++++----------
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 915c727..9da6335 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,7 @@ RUN apt-get update && apt-get -y upgrade && \
 	jq \
 	curl \
 	cpio \
+	kmod \
 	wget \
 	unzip \
 	procps \
diff --git a/network.sh b/network.sh
index c86da26..b9c195c 100644
--- a/network.sh
+++ b/network.sh
@@ -1,16 +1,6 @@
 #!/usr/bin/env bash
 set -eu
 
-if [ ! -e /dev/net/tun ]; then
-
-   mkdir -p /dev/net
-   mknod /dev/net/tun c 10 200
-   chmod 600 /dev/net/tun
-
-fi
-
-[ ! -e /dev/net/tun ] && echo "Error: TUN network interface not available..." && exit 85
-
 : ${INFO:='N'}
 : ${DEBUG:='N'}
 
@@ -100,6 +90,22 @@ configureNatNetworks () {
 MAJOR=""
 _DhcpIP=""
 
+# Create the necessary file structure for /dev/net/tun
+if ( [ ! -c /dev/net/tun ] ); then
+  if ( [ ! -d /dev/net ] ); then
+    mkdir -m 755 /dev/net
+  fi
+  mknod /dev/net/tun c 10 200
+  chmod 0755 /dev/net/tun
+fi
+
+# Load the tun module if not already loaded
+if ( !(lsmod | grep -q "^tun\s") ); then
+  [ -f /lib/modules/tun.ko ] && insmod /lib/modules/tun.ko
+fi
+
+[ ! -c /dev/net/tun ] && echo "Error: TUN network interface not available..." && exit 85
+
 #log "INFO" "Little dirty trick ..."
 update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
 update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null