From c4a6918c12fadd3f5db864a8b36f5750b3e8d902 Mon Sep 17 00:00:00 2001
From: "Igor Zalatov (from Citadel PC)" <flyrouter@gmail.com>
Date: Wed, 31 Aug 2022 18:33:33 +0300
Subject: [PATCH] Add vtund with special edition

---
 .../general/overlay/usr/sbin/tunnel           | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100755 Projects/t31_vixand/general/overlay/usr/sbin/tunnel

diff --git a/Projects/t31_vixand/general/overlay/usr/sbin/tunnel b/Projects/t31_vixand/general/overlay/usr/sbin/tunnel
new file mode 100755
index 0000000..8d631e8
--- /dev/null
+++ b/Projects/t31_vixand/general/overlay/usr/sbin/tunnel
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# OpenIPC.org | v.20220829
+# by Igor Zalatov, aka FlyRouter, aka ZigFisher
+# Busybox applets: awk cat echo insmod ip modprobe sha1sum sleep tr tunctl udhcpc uptime
+#
+
+
+vtund_enable="1"
+vtund_server=$1
+vtund_server=${vtund_server:=vtun.localhost}
+vtund_port="5000"
+vtund_iface="tunnel"
+device_name="IPC-VTUND"
+working_dir="/tmp"
+
+
+identity() {
+  # identity_src=$(ip r | awk '/default/ {print $5}' | head -n 1)
+  identity_src=$(ip r | sed -nE '/default/s/.+dev (\w+).+?/\1/p' | head -n 1)
+  # identity_mac=$(cat /sys/class/net/${identity_src}/address | tr 'a-z' 'A-Z')
+  identity_mac=$( (if [ "${identity_src}" = "ppp0" ] || [ -z "${identity_src}" ] ; then fw_printenv -n ethaddr; else cat /sys/class/net/${identity_src}/address; fi) | tr 'a-z' 'A-Z')
+  identity_pas=$(echo ${identity_mac} | sha1sum | awk '{print $1}')
+  identity_tid=$(echo ${identity_mac} | tr -d ':')
+  identity_cfg=${working_dir}/vtund.conf
+}
+
+
+interface() {
+  [ -L /sys/class/net/${vtund_iface} ] || (modprobe tun; tunctl -t ${vtund_iface}) >/dev/null 2>&1
+  [ -f ${working_dir}/udhcpc-${vtund_iface}.pid ] && kill -9 $(cat ${working_dir}/udhcpc-${vtund_iface}.pid) >/dev/null 2>&1
+}
+
+
+config() {
+  ( echo "#"
+    echo "options {"
+    echo "  port ${vtund_port};"
+    echo "  ifconfig /sbin/ifconfig;"
+    echo "}"
+    echo "${identity_tid} {"
+    echo "  password ${identity_pas};"
+    echo "  device ${vtund_iface};"
+    echo "  stat no;"
+    echo "  persist yes;"
+    echo "  keepalive 10:5;"
+    echo "  timeout 10;"
+    echo "  up {"
+    echo "    ifconfig \"${vtund_iface} hw ether ${identity_mac} mtu 1500 -multicast up\";"
+    echo "    program \"udhcpc -T 1 -t 5 -R -b -O staticroutes -S -s tapip -p ${working_dir}/udhcpc-${vtund_iface}.pid -i ${vtund_iface} -x hostname:${device_name}-${identity_tid}\";"
+    echo "  };"
+    echo "  down {"
+    echo "    ifconfig \"tunnel down\";"
+    echo "  };"
+    echo "}"
+  ) >${identity_cfg}
+}
+
+
+if [ ${vtund_enable} = 1 ]; then
+  (while true ; do sleep 10; identity; interface; config; vtund -n -f ${identity_cfg} ${identity_tid} ${vtund_server} >/dev/null 2>&1; done) &
+fi
+
+
+exit 0