How to create a vpn application with C# .NET

what's up guys Shane TV here and today

I'd like to show you how to create your

own VPN application everything in this

tutorial is completely free and I will

provide all the download links in the

description below I'd like to cover four

things this tutorial the first one being

coding our actual VPN application

secondly creating our VPN server that

we're going to connect to I'm using

digitalocean

just because they provide your first 30

days they provide like a 30 day trial

you guys can use I'll leave a link for

that in the description you guys can use

it as well

number three configuring our VPN server

for both so that we can connect with UDP

if we want to or if we want to connect

with TCP we can do that as well

and finally accessing restricted content

with the VPN that we're going to make

today I'm going to show you guys a

YouTube video that's blocked in my

country we're going to access it with

this VPN that we're about to make the

tools that you guys are going to need is

putty FileZilla and the community

edition version of Open VPN I'll leave a

link for that in case you don't know

what that is

everything was going to be in the

description all the download links so

now that we got that out of the way

let's go ahead and open visual studio

make sure you guys run it as an

administrator and go down to create a

new projects here you can scroll down

until you see Windows forms at net

framework hit next project name let's

just call it VPN and create now that we

have loaded that up you'll see a blank

form in the bottom right in the

properties box we can just name this

form 1 VPN and you can see it changed up

there to VPN

next open the toolbox search for combo

box search again for button double click

that twice we need two buttons and then

right underneath it the radio button

we're going to need two radio buttons

close the toolbox I've got both our

buttons both our radio buttons and our

combo box so let's start with radio

button one let's call that UDP let's

click on radio button two and call that

TCP I'm going to bring it

line it up a little bit let's call it

the button one connect and call button

to disconnect so now we've got a connect

button make it a little bit bigger and

we've got a disconnect button that all

looks good line it up a little bit if

you click on the background of the form

you can actually resize it I'm gonna

make it just about that that looks fine

you can start the program and see how it

looks make it a little bit bigger

actually and that's perfect so click on

the combo box and at the top you're

going to see an arrow like a black arrow

click on that and hit edit items in here

we're gonna name our server we'll just

call it server and also in the

properties box we can scroll down and so

it says text and let's just type select

your server

so if we go ahead and run that again

you'll see it says select your server

server that's our server name and we can

connect with UDP or we can connect with

TCP now we also have a disconnect button

so to get started on this let's double

click the connect button and you see

it's creates a private void button

underscore click go up to the top here

delete all these extra system namespaces

and I'm just going to add using system

Diagnostics you should have you should

only need to use three namespaces for

this tutorial so now that we have button

one click private void you can double

click on disconnect as well if you want

that's also going to create a private

void for that and that should be good so

now we can begin writing some code let's

start this off with our button one our

connect button with an if statement so

if combobox one text is equal to server

remember how bare woops finish that if

statement off remember how I made it say

server here so that if the combo box

equals server and the radio button one

is checked then it'll run whatever's

inside here we can also do it else if

combobox one text equals server and

radio button 2 just checked meaning if

the only server that we have is server

right

if UDP is selected it'll connect this is

radio button 1 and then in our else--if

statement radio button 2 if this is

checked then this will connect with tcp

instead so now that we have our if and

else if statements set up we can start

by writing some code so process start

with a new process let's also add a

process start info we're going to use a

lot of start info in this tutorial

whoops

so new process new process starting Phil

let's add some start info let's start

with a filename this is actually the

file what's kind of that's going to

connect to the VPN so Open File Explorer

go to your local disk program files Open

VPN this should it should be here for

everybody but if not it's good to double

check that your Open VPN exe is in here

so I'm just going to copy this Open VPN

dot exe copy all that and paste it in

there

next we'll add some arguments this is

actually going to be the open VPN

configuration file that we're going to

make so config I don't really know a

server name so I'm just gonna say a

server to VPN not sure where what region

I'll use yet start info again we'll do a

verb run as this is this ensures that

you're running as an administrator and

then process start info start info

process start and that's about it you

can go ahead and copy that and paste it

in our other else if statement also

another thing you could add here is a

message box and say something like

you've connected to server with UDP copy

that and also paste it down here also I

accidentally didn't copy that

make sure you so make sure that you can

just copy paste this and post it in your

other else if statement and it should

work fine down here is our button to

click you remember but button to is our

disconnects button so we're actually

going to need to create a function or a

method for this you can start with

saying like disconnects and it'll

automatically generate a method down

here

so private void disconnects the way we

can start this is let's start with

process start new process start info

close that off with waits for exit

and that should be good

rush it start info whoops I think I

added an extra I messed up somewhere

there we go and what this function is

going to do here is it's basically going

to kill our OpenVPN exe so that we

disconnect from the VPN so start with

file name tasks or it will just say

tasks he'll all right we'll give us some

arguments and this is what is going to

kill the process so if I am and then our

OpenVPN exe you see right here it says

OpenVPN exe this is a file we're going

to be killing create no window set

that's a true use shell execute so

that's a false oops and that's good this

so this is our function our disconnect

function as soon as somebody hits the

disconnect button this function will

execute and kill the OpenVPN if it's

running so let's double check this

server UDP connect you've connected to

the server with UDP TCP you've connected

to server with UDP oh shoot I change

this to TCP obviously run that you've

connected to server TCP there we go

everything's running good everything

looks good I guess we can go ahead and

begin configuring our server or creating

our server and then configuring it for

UDP and TCP protocol

so like I said I'm using digital ocean

for this it's all free it's like a free

30-day trial go to your projects go to

get started with a droplet this will

load you've been to eighteen point oh

four point three is fine starter plan

five bucks a month region I'm gonna go

with London United Kingdom

you guys can choose any of these I just

prefer to go with this one one time

password and create triplet

this should only take a couple seconds

to create

and it's made good to my Inbox

your new droplet your new droplet is all

set to go your IP address right here

copy that and let's open our putty open

up putty and it should say hostname or

IP address this is where we put our IP

address it'll say it'll bring up a

security alert you can just hit

yesterday login our username is root our

password is right here

a change in password for root current

UNIX password enter that password again

and then create a new password and we're

in so now that we're into our server we

can begin configuring it and installing

open VPN on it the first thing we want

to do is go to the github of our Open

VPN installer I'll leave a link to this

github in the description if you guys

want basically this guy made a really

quick way to install Open VPN on really

any any any distro so copy that run

these commands right here it'll ask you

some information like your server IP

address do you want to use a custom port

we'll just use the default

UDP enter enter enter and then it'll

make it in the meantime while this

server is being created let's go ahead

and copy our IP address again and open

FileZilla

login with root and the password that we

just made and port 22 quick connects

you might get an update from FileZilla

just close out of that go back to our

putty client it says tell me a name for

the client I'm going to name this UK UDP

and no password and then hit refresh on

FileZilla and you'll see our UK UDP Open

VPN file has been made we can drag this

onto our desktop

that successfully transferred don't sour

desktop and now what we're going to do

is we're going to create a TCP

configuration and that's actually done

because the owner of this github didn't

actually add a TCP option to run UDP and

TCP at the same time you see we can

check by running this command here and

this basically checks port one one nine

four and you can see we do have UDP

running OpenVPN UDP running but there's

no tcp well there's no option to add tcp

i'm going to show you guys how to do

that real quick here simply go to the

remote site here at the top of FileZilla

it type in /etc forward slash Open VPN

you'll see a server config file drag

that on your desktop copy it paste it on

the desktop and name it server to that

config and if we go ahead and open the

first server config you'll see it says

proto meaning protocol UDP on port one

194 using server ten point eight point

zero point zero let's go ahead and open

our server to config

and let's change protocol UDP to TCP

let's replace server ten point eight to

ten point nine and save drag that back

into the server hit refresh

oops you should see a server to config

show up I'm going to drag it and drop it

again see there we go so now I have

server duck config and I also have a

server to that config which is good we

can delete these off of our desktop now

and open our putty back up and let's put

some IP tables in here so let me extend

this so you guys can see it a little bit

better

IP tables all the stuff will be in the

description

this is opening port 1 1 9 4 4 TCP

accept and this command here will open

that new server we just created 10.9

accepts and all we got to do now is we

start our Open VPN server so service of

MVP enters restart and then type the

same command Open VPN s over to or start

go back into files of the forward slash

routes in here you'll see a Open VPN

slash install that Sh hit view or edit

on that make it a little bit bigger and

what we're gonna do here is we're gonna

find or actually we're going to go to

line 8 8 3 it's gonna be a little bit

different for you guys because the

github owner if he were to change some

code in here

you know this obviously wouldn't be line

III anymore because he could add you

know GGG here

and this this is now line 886 so

anywhere that looks like around this

coat area it should be fine we're only

pasting one line of code in here and

that's this line of code right here

said I server to the server to config

that we just made

ctrl save close would you like to save

yes

refresh and that's all good we can go

ahead and restart again if you we could

have done that art before but it doesn't

really matter and now when we run that

command from earlier look at this we've

got TCP running now open VPN and we also

have UDP running Open VPN all we got to

do now copy the UK UDP paste it let's

call this UK TCP open with notepad

change that protocol to TCP safe now

we've got both of our Open VPN

configuration files UK UDP and UK TCP

open our file explorer go to local disk

go to Program Files I believe all right

now I'm sorry go to users Shane or

whatever your name is on the PC source

repos VPN VPN bin-debug

and here is where we can paste those

configuration files go back into our VPN

back out of that a little bit and I'll

zoom in so you guys can see make sure

the configuration file we made earlier

it's the same name so UK UDP for a radio

button one that's UDP and this one has

to be UK TCP and that should be fine so

now we both we have all of our

configuration setup on our server we can

close out of putty we can close out of

FileZilla let's go ahead and give this a

test select your server server UDP

connect and you can see you've connected

the server with UDP and you'll see a CMD

open in the background this is actually

Open VPN DXE running and connecting you

to the server I'm going to open my

Chrome backup go to what is my IP

address comm and now I'm located digital

ocean United Kingdom let's go ahead and

disconnect hit f5 and now I'm back in

the United States with Verizon Wireless

so our VPN has successfully been made oh

we should probably test the TCP protocol

that we just made as well so go to

what's my IP address comm connect with

TCP you've connected to server with TCP

let all this run and then go and hit f5

now I'm back in United Kingdom with

digital ocean

so we've confirmed that UDP and TCP are

both working we can disconnect and let's

actually add something in here so that

that black CMD screen doesn't pop up in

the background we can start that or we

can do that by saying Start info window

style process window style hidden copy

that and paste it into our other else if

statement also go down here I'm going to

add a message box just so that we know

we disconnected we hit a disconnect

button you've disconnected from Terr

server

that's fine start our program up again

select server UDP connect if connected

to the server with UDP f5

I'm in the United Kingdom and there's no

of that background CMD coming up hit

disconnect you've disconnected from the

server

let's hit f5 I'm back in the United

States

ok now let's test it with TCP hit

connect

you've connected the server with TCP

let's hit f5 whoops give it another

second and digitalocean United Kingdom

so disconnect from that open our notes

back up and the fourth thing of this I

wanted to talk about was accessing

restricted content with the VPN we just

made so I'm going to go to youtube and

we are disconnected from the VPN right

now so open a tab and go to youtube.com

you see this video here is unavailable

this video contains content from Viacom

who has blocked in your country on

copyright grounds I can't see the video

I can't see comments or turned off I

can't see anything let's connect to our

server you've connected server with UDP

let's hit f5

and the video is loaded I can look at

all the comments all the videos we just

bypassed the YouTube restriction with a

simple VPN client like this hit

disconnect you've disconnected from the

server let's go ahead hit f5 on YouTube

and I'm blocked I can't see comments I

can't see the videos everything's

blocked

let's try connecting with TCP connect

you've connected to the server with TCP

hit f5 and the video is loaded all the

comments are loaded disconnect at 5 and

we're blocked so that's just a

real-world example of how this VPN this

simple tool we just made today can you

can access any website any YouTube video

that is restricted in your country so I

hope you guys enjoyed we covered all

four things today yep I think that's

about it for this video I hope you guys

enjoyed if you'd like to see some more

videos like this comment down below what

you'd like to see if you enjoyed this

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guys