Arch Linux

frunkaf

Member

Registered: 2020-01-04

Posts: 3

OpenVPN Client Route Script

Hello,

I'm following this tutorial to limit my VPN client connection to a single interface so I can use it with certain programs and have all other services work through my regular internet connection...

https://www.pantz.org/software/openvpn/ … rding.html

I can't run the script file provided in this tutorial because of a syntax error and missing commands.

Here is the script I'm trying to run...

#!/bin/sh
# script used by OpenVPN to setup a route on Linux.
# used in conjunction with OpenVPN config file options
# script-security 2, route-noexec, route-up 
# script also requires route table rt2
# sudo bash -c 'echo "1 rt2" >> /etc/iproute2/rt_tables'

# openvpn variables passed in via env vars
rtname="rt2"
int=$dev
iplocal=$ifconfig_local
ipremote=$ifconfig_remote
gw=$route_vpn_gateway

if [ -z $int ] || [ -z $iplocal ] || [ -z $ipremote ] || [ -z $gw ]; then
  echo "No env vars found. Use this script with an OpenVPN config file "
  exit 1
fi

help() {
  echo "For setting OpenVPN routes on Linux."
  echo "Usage: $0 up or down"
}

down() {
  # delete vpn route if found
  ip route flush table $rtname
  if [ $? -eq 0 ]; then
    echo "Successfully flushed route table $rtname"
  else
    echo "Failed to flush route table $rtname"
  fi    
}

up() {
  # using OpenVPN env vars that get set when it starts, see man page
  echo "Tunnel on interface $int. File /tmp/vpnint"
  echo $int > /tmp/vpnint
  echo "Local IP is         $iplocal. File /tmp/vpnip"
  echo $iplocal > /tmp/vpnip
  echo "Remote IP is        $ipremote"
  echo "Gateway is          $gw"

  down # remove any old routes

  ip route add default via $gw dev $int table $rtname
  if [ $? -eq 0 ]; then
    echo "Successfully added default route $gw"
  else
    echo "Failed to add default route for gateway $gw"
  fi
  ip rule add from $iplocal/32 table $rtname
  if [ $? -eq 0 ]; then
    echo "Successfully added local interface 'from' rule for $iplocal"
  else
    echo "Failed to add local interface 'from' rule for $iplocal"
  fi
  ip rule add to $gw/32 table $rtname
  if [ $? -eq 0 ]; then
    echo "Successfully added local interface 'to' rule for $gw"
  else
    echo "Failed to add local interface 'to' rule for $gw"
  fi

}

case $1 in
  "up") up;;
  "down") down;;
  *) help;;
esac

# always flush route cache 
ip route flush cache

When I do a

sudo bash -x openvpn-route.sh

I get the following output...

+ $'\r'
/etc/openvpn/surfshark/openvpn-route.sh: line 7: $'\r': command not found
+ rtname=$'rt2\r'
+ int=$'\r'
+ iplocal=$'\r'
+ ipremote=$'\r'
+ gw=$'\r'
+ $'\r'
/etc/openvpn/surfshark/openvpn-route.sh: line 14: $'\r': command not found
/etc/openvpn/surfshark/openvpn-route.sh: line 20: syntax error near unexpected token `$'{\r''
'etc/openvpn/surfshark/openvpn-route.sh: line 20: `help() {

If I'm not mistaken, Lines 7 and 14 are blank.

Line 20 is

help() {

.

This same script was executing before on debian, ubuntu, and centos. Am I missing packages? Does this need to be modified for Arch in some way?

I'd really appreciate any assistance at all. Thank you so much!

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: OpenVPN Client Route Script

Where are you setting the required environment variables? What's the output of...

env

---

No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

frunkaf

Member

Registered: 2020-01-04

Posts: 3

Re: OpenVPN Client Route Script

That output is...

SHELL=/bin/bash
PWD=/home/frunk
LOGNAME=frunk
XDG_SESSION_TYPE=tty
HOME=/home/frunk
LANG=C
SSH_CONNECTION=10.255.255.1 60126 10.255.255.253 31337
XDG_SESSION_CLASS=user
TERM=xterm
USER=frunk
SHLVL=1
XDG_SESSION_ID=3
XDG_RUNTIME_DIR=/run/user/1000
PS1=[\[\]\[\033[38;5;13m\]\u\[\]\[\033[38;5;14m\]@\h\[\]\[\033[38;5;15m\] \[\]\[\033[38;5;10m\]\w\[\]\[\033[38;5;15m\]]\$ \[\]
SSH_CLIENT=10.255.255.1 60126 31337
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
MAIL=/var/spool/mail/frunk
SSH_TTY=/dev/pts/0
_=/usr/bin/env

frunkaf

Member

Registered: 2020-01-04

Posts: 3

Re: OpenVPN Client Route Script

Found the solution!

https://stackoverflow.com/questions/116 … sh-profile

running dos2unix on the script made it work again.

I have yet to understand why but it works now.