startSoftEther.sh

#!/bin/bash

# SoftEther On-Demand Initialization Script

# First, ensure you create a "Local Bridge with New Tap Device" and name it soft or change TAP_DEVICE accordingly

# This script will allow connection to the vpn server from connected vpn clients
# It will create on-demand a bridge between eth0 <-> br0 <-> tap_soft 
# with the same ip as the undelying physical adapter 

CURRENT_IP=$(ip route get 1 | grep -Po '(?<=src )(\S+)')
CURRENT_GW=$(ip -4 route ls | grep default | grep -Po '(?<=via )(\S+)')
TAP_DEVICE='tap_soft'

echo "Adding bridge adapter to $TAP_DEVICE with existing IP $CURRENT_IP GW $CURRENT_GW"

# set up bridge
ip link add br0 type bridge
ip link set eth0 master br0

# unset eth0 ip info
ip addr flush dev eth0
ip link set dev br0 up

# Setup static ip
ip a add $CURRENT_IP/24 dev br0
ip route add default via $CURRENT_GW

./vpnserver/vpnserver start

while [ -z "`ifconfig | grep $TAP_DEVICE`" ]
do
  echo "Wait for tap adapter $TAP_DEVICE "
  sleep 2
done

echo "Found VPN adapter, attaching to bridge."
ip link set dev $TAP_DEVICE master br0