Force DNS Usage inside VPN
SystemD
$ cat /etc/systemd/system/vpn-dns.service
[Unit]
Description=VPN DNS Configuration
[Service]
Type=oneshot
ExecStart=/bin/vpn-dns
Environment=TERM=xterm
[Install]
WantedBy=multi-user.target
OpenRC
#!/sbin/openrc-run
# Distributed under the terms of the GNU General Public License v3 or later
name="vpn-dns"
description="VPN DNS Configuration"
pidfile="/var/run/vpn-dns.pid"
command="/bin/vpn-dns"
depend() {
use net
}
start() {
ebegin "Starting ${name}"
start-stop-daemon --start --exec "${command}" --pidfile "${pidfile}"
eend $?
}
reload() {
ebegin "Reloading ${name}"
start-stop-daemon --signal HUP --pidfile "${pidfile}"
eend $?
}+
stop() {
ebegin "Stopping ${name}"
start-stop-daemon --quiet --stop --exec "${command}" --pidfile "${pidfile}"
eend $?
}
$ cat /bin/vpn-dns
#!/bin/bash
echo "Getting current DNS servers, this takes a couple of seconds"
/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -Command '
$ErrorActionPreference="SilentlyContinue"
Get-NetAdapter -InterfaceDescription "WireGuard Tunnel*" | Get-DnsClientServerAddress | Select -ExpandProperty ServerAddresses
Get-NetAdapter | ?{-not ($_.InterfaceDescription -like "WireGuard Tunnel*") } | Get-DnsClientServerAddress | Select -ExpandProperty ServerAddresses
' | \
awk 'BEGIN { print "# Generated by vpn fix func on", strftime("%c"); print } { print "nameserver", $1 }' | \
tr -d '\r' > /etc/resolv.conf
clear
Show Networks
c/> Get-NetAdapter