B4A Library [Lib] Global Proxy Connector & DNS Changer

Hello everyone

This library enables you to connect to proxy servers using Android's VpnService.

*Please use the latest library version 2.0

It will work globally meaning it will work in the background of the user's phone and not just in your application.

How to use :
1- Copy the Jar & Xml files to your internal library folder

2- In your manifest file add the following :

AddPermission(android.permission.ACCESS_WIFI_STATE)
AddPermission(android.permission.INTERNET)
AddPermission(android.permission.ACCESS_NETWORK_STATE)

AddPermission(android.permission.BIND_VPN_SERVICE)

AddApplicationText(
<service android:name="com.b4xcode.proxyclient.LocalVpnService"
   android:label="B4XCode Proxy Service"
  android:permission="android.permission.BIND_VPN_SERVICE">
  <intent-filter>
  <action android:name="android.net.VpnService" />
  </intent-filter>
</service>)
SetApplicationAttribute(android:usesCleartextTraffic, "true")

*You can change the VPN sticky notification service name by changing the following :

android:label="B4XCode Proxy Service"

To what whatever you would like.

3- In the Globals sub Add:

Sub Globals
    Dim b4xpc As B4XCodeProxyConnector
End Sub

4- Initialize the service :

b4xpc.Initialize

5- Then Create the service (it will prepare the VPN to create a profile in the system settings) :

b4xpc.CreateService

6- Set the Proxy server IP & Port :

b4xpc.SetProxyServer("Proxy Server IP",Proxy Server Port)

Example :

b4xpc.SetProxyServer("5.44.54.16",8080)

*If the user is running your application for the first time then he/she will be prompted with the VPN permission dialog to accept the creation of the Proxy VPN profile, once accepted the service will start automatically

-----
7- To Stop the service :

b4xpc.StopProxyService

8- To Start the service : You Should only call this method if the service is stopped, or this is not the first time the user started the service.

b4xpc.StartProxyService

Complete Example :

Sub Globals
    Dim b4xpc As B4XCodeProxyConnector
End Sub

Sub Activity_Create(FirstTime As Boolean)
    b4xpc.Initialize
    b4xpc.CreateService
    b4xpc.SetProxyServer("5.44.54.16",8080)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)
    If UserClosed Then
        b4xpc.StopProxyService
    End If
End Sub

Update Version 1.5:
You can now add DNS servers to your proxy connection without any root
Example :

Sub Globals
    Dim b4xpc As B4XCodeProxyConnector
End Sub

Sub Activity_Create(FirstTime As Boolean)
    b4xpc.Initialize
    b4xpc.AddDNSRoute("195.46.39.39")
    b4xpc.AddDNSRoute("208.67.220.220")
    b4xpc.CreateService
    b4xpc.SetProxyServer("94.127.212.200",5900)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)
    If UserClosed Then
        b4xpc.StopProxyService
    End If
End Sub

Update Version 2.0:
You can now use the DNS Changer without the need to establish a proxy connection, simple download the library version 2.0, below is the use case example :
After testing and reports, it seems that the DNS service will not run without setting up the proxy connection first.
So you have to set up a proxy connection first then you are able to change the DNS.

Example :

Sub Globals
    Dim b4xpc As B4XCodeProxyConnector
End Sub

Sub Activity_Create(FirstTime As Boolean)
    b4xpc.Initialize
    b4xpc.AddDNSRoute("195.46.39.39")
    b4xpc.AddDNSRoute("208.67.220.220")
    b4xpc.CreateService
    b4xpc.SetProxyServer("94.127.212.200",5900)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)
    If UserClosed Then
        b4xpc.StopProxyService
    End If
End Sub

Thank you,
Saif

 

[scsjc]

Thank you very much for sharing, super interesting.

By the way, do you know of some way to change the DNS of the current connection.
I found this application in PlayStore "Change DNS" that works and changes the DNS to navigate, without the need for root.

Thanks

 

[sfsameer]

Thank you very much for sharing, super interesting.

By the way, do you know of some way to change the DNS of the current connection.
I found this application in PlayStore "Change DNS" that works and changes the DNS to navigate, without the need for root.

Thanks

Hello Dear,

Noted, we will look into it right away and get back to you

Thank you,
Saif

 

[scsjc]

Hello Dear,

Noted, we will look into it right away and get back to you

Thank you,
Saif

Thank you very much friend.
Greetings

 

[sfsameer]

Thank you very much friend.
Greetings

Done

Would you like it to be in the same library or a separated library ?

 

[sfsameer]

Changed the android DNS to OpenDNS without root :

 

[scsjc]

Changed the android DNS to OpenDNS without root :
View attachment 113940

yes, i want doit with b4a

 

[sfsameer]

yes, i want doit with b4a

I know my dear,
We have implemented it with b4a and it's ready using B4XCodeProxyConnector

My question is should we implement it in the same library ?

 

[scsjc]

I know my dear,
We have implemented it with b4a and it's ready using B4XCodeProxyConnector

My question is should we implement it in the same library ?

I think it would have to be in a library requiring minimum permissions for maximum acceptance
(permissions are not very pleasant to use in google)

eg don't use "AddPermission (android.permission.BIND_VPN_SERVICE)" (if you can)

 

[sfsameer]

I think it would have to be in a library requiring minimum permissions for maximum acceptance
(permissions are not very pleasant to use in google)

Done, the library will be updated shortly

 

[scsjc]

Done, the library will be updated shortly

if you can, don't use "AddPermission (android.permission.BIND_VPN_SERVICE)" to maximize compatibility with minimum permissions.

 

[sfsameer]

if you can, don't use "AddPermission (android.permission.BIND_VPN_SERVICE)" to maximize compatibility with minimum permissions.

This permission is required for the service to work in the background in the newer android versions

 

[sfsameer]

The library has been updated and we have added DNS Routing :
Update Library Version : 1.5

*Make sure to add the "AddDNSRoute" after the "Initialize" and before the "CreateService"

Enjoy

 

[scsjc]

This permission is required for the service to work in the background in the newer android versions

check this app ... "Change DNS" dont use this permision

 

[sfsameer]

check this app ... "Change DNS" dont use this permision

You can remove the permission from the manifest but we will keep it in the library post just in case other users face a problem.

 

[scsjc]

The library has been updated and we have added DNS Routing :
Update Library Version : 1.5

*Make sure to add the "AddDNSRoute" after the "Initialize" and before the "CreateService"

Enjoy

you are a genius

 

[sfsameer]

you are a genius

Thank you

 

[scsjc]

The library has been updated and we have added DNS Routing :
Update Library Version : 1.5

*Make sure to add the "AddDNSRoute" after the "Initialize" and before the "CreateService"

Enjoy

is necesary create proxy to add/change dns ??? ... ( b4xpc.SetProxyServer("94.127.212.200",5900 )
because i want a change dns only

 

[sfsameer]

is necesary create proxy to add/change dns ??? ... ( b4xpc.SetProxyServer("94.127.212.200",5900 )
because i want a change dns only

That's why i asked you before if you would like it to be a separated library because this library is for the Proxy connections

It will be updated shortly

 

[sfsameer]

Done

Update Library Version : 2.0

Now you can change the DNS without the need to establish a Proxy connection.

Enjoy