Own VPN client on JavaScript. Part 3 - OpenVPN component

PS Each part is a part, by itself it does not make sense to get the necessary context and not to experience cognitive dissonance from the lack of so necessary blocks of text, start reading from part 1

OpenVPN is the main component responsible for setting up and using a VPN connection.

Folder structure

OpenVPN │ │ index.js │ status.js │ ├───installer │ index.js │ tap-windows-9.21.1.exe //    │ └───VPN ├───ia32 //     └───x64 // OpenVPN,    VPN

')
status.js - File containing response statuses from OpenVPN.exe.

Since OpenVPN.exe initially responds with strings, I decided for convenience of giving all the answers an id, be it a connection, reconnection, or an error, the message is convenient to use for debugging.

The contents of the status.js file.

Code

 module.exports = { VPN_START_CONNECT: { regexp: new RegExp(`OpenVPN 2.4.6`, `gi`), message: `  VPN`, id: 1 } , VPN_CONNECT: { regexp: new RegExp(`Initialization Sequence Completed`, `gi`), message: `VPN     `, id: 2 } , VPN_RECONNECT: { regexp: new RegExp(`Restart pause, .+second`, `gi`), message: `  VPN`, id: 3 } , VPN_ERROR: { message: ` OpenVPN`, id: 4 } , VPN_DISCONNECT: { message: `  VPN`, id: 5 } , TCP_START_CONNECT: { regexp: new RegExp(`Attempting to establish TCP connection with`, `gi`), message: `  TCP-  VPN`, id: 6 } , TCP_CONNECT_ERROR: { regexp: new RegExp(`TCP: connect to.+failed: Unknown error`, `gi`), message: `   TCP-  VPN`, id: 7 } , TCP_CONNECT: { regexp: new RegExp(`TCP connection established with`, `gi`), message: `TCP-   VPN`, id: 8 } , TAP_START_SETUP: { message: ` TAP `, id: 9 } , TAP_USE: { regexp: new RegExp(`There are no TAP-Windows adapters on this system.+`, `gi`), message: `  OpenVPN  .`, id: 10 } , TAP_NOT: { regexp: new RegExp(`There are no TAP-Windows adapters on this system.+`, `gi`), message: `     TAP`, id: 11 } , TAP_SETUP_ERROR: { message: `   TAP `, id: 12 } , TAP_SETUP: { message: `TAP      `, id: 13 } , IP_ADDRESS_ERROR: { regexp: new RegExp(`TCP: connect to.+failed: Unknown error`, `gi`), message: `  VPN ,   `, id: 14 } }

installer> index.js - The file containing the function that installs the Tap Adapter returns a promise.

The contents of the file installer> index.js .

Code

 const { exec } = require(`child_process`) module.exports = () => new Promise((resolve, reject) => { const command = `${__dirname}/tap-windows-9.21.1.exe` exec(command, (err, stdout, stderr) => { if (err) { return reject(); } resolve() }); })

OpenVPN> index.js - File containing a class with methods for: Settings , Connections , Disconnections , Processing .

The content of the OpenVPN file > index.js .

Code

 const { spawn } = require(`child_process`) , fs = require(`fs`) , installer = require('./installer') , STATUS = require('./status') module.exports = class OpenVPN { constructor() { //    on      this.cb = data => console.log(data) //      this.info_config = {} //    ,      this.reconnect = 0 } //        OpenVPN -- .   on(cb) { this.cb = cb } installer() { //      Tap  this.cb({ id: STATUS.TAP_START_SETUP.id, message: STATUS.TAP_START_SETUP.message }, this.info_config) installer().then(() => { //   this.cb({ id: STATUS.TAP_SETUP.id, message: STATUS.TAP_SETUP.message }, this.info_config) }, () => { //   this.cb({ id: STATUS.TAP_SETUP_ERROR.id, message: STATUS.TAP_SETUP_ERROR.message }, this.info_config) }) } disconnect() { //    (  VPN) try { this.VPN.kill() } catch (e) {} } connect(path_config, info_config) { this.info_config = info_config //         // (  VPN  ) const command = `${__dirname}/VPN/${process.arch}/bin/openvpn.exe` , VPN = spawn(command, [`--config`, path_config]); //     VPN.stdout.on(`data`, data => { const text = data.toString() if (text.match(STATUS.TCP_CONNECT_ERROR.regexp)) { this.cb({ id: STATUS.TCP_CONNECT_ERROR.id, message: STATUS.TCP_CONNECT_ERROR.message }, this.info_config) return } if (text.match(STATUS.IP_ADDRESS_ERROR.regexp)) { this.cb({ id: STATUS.IP_ADDRESS_ERROR.id, message: STATUS.IP_ADDRESS_ERROR.message }, this.info_config) return } if (text.match(STATUS.TAP_USE.regexp)) { this.cb({ id: STATUS.TAP_USE.id, message: STATUS.TAP_USE.message }, this.info_config) return } if (text.match(STATUS.TAP_NOT.regexp)) { this.cb({ id: STATUS.TAP_NOT.id, message: STATUS.TAP_NOT.message }, this.info_config) return } if (text.match(STATUS.VPN_START_CONNECT.regexp)) { this.cb({ id: STATUS.VPN_START_CONNECT.id, message: STATUS.VPN_START_CONNECT.message }, this.info_config) return } if (text.match(STATUS.TCP_START_CONNECT.regexp)) { this.cb({ id: STATUS.TCP_START_CONNECT.id, message: STATUS.TCP_START_CONNECT.message }, this.info_config) return } if (text.match(STATUS.TCP_CONNECT.regexp)) { this.cb({ id: STATUS.TCP_CONNECT.id, message: STATUS.TCP_CONNECT.message }, this.info_config) return } if (text.match(STATUS.VPN_CONNECT.regexp)) { this.cb({ id: STATUS.VPN_CONNECT.id, message: STATUS.VPN_CONNECT.message }, this.info_config) return } if (text.match(STATUS.VPN_RECONNECT.regexp)) { // c       if (this.reconnect) { return } this.reconnect = 1 this.cb({ id: STATUS.VPN_RECONNECT.id, message: STATUS.VPN_RECONNECT.message }, this.info_config) return } else { this.reconnect = 0 } }); //    VPN.stderr.on(`data`, (data) => { this.cb({ id: STATUS.VPN_ERROR.id, message: STATUS.VPN_ERROR.message }, this.info_config) }); VPN.on(`close`, (code) => { this.cb({ id: STATUS.VPN_DISCONNECT.id, message: STATUS.VPN_DISCONNECT.message }, this.info_config) }); this.VPN = VPN } }

Application
Application use: / app / OpenVPN .

API
OpenVPN component interface.

 const OpenVPN = require('./../../app/components/OpenVPN') const ovpn = new OpenVPN() //    ovpn.on(({ id, message }, other) => { if (id == 10 || id == 11) { //  ovpn.installer() } console.log(`id: ${id} | message: ${message}`) }) //  ovpn.connect(`${__dirname}/config.ovpn`, { reconnect: true }) setTimeout(() => { //  ovpn.disconnect() }, 30000)

Test
Test version: / app_test / OpenVPN .

Table of answers.

ID	Description
one	VPN connection
2	VPN is connected and ready to go.
3	VPN Reconnect
four	OpenVPN Error
five	Disconnect from VPN
6	Attempt to establish TCP connection with VPN
7	Failed to establish TCP connection with VPN
eight	TCP connection established with VPN
9	Installing TAP Adapter
ten	OpenVPN virtual driver is already in use
eleven	There are no TAP adapters in this system.
12	Could not install TAP adapter
13	TAP adapter installed and ready to go.
14	Problems with the VPN server, can not connect

Part 4 - Configs Component

Navigation

Part 1 - introductory
Part 2 - Development
Part 3 - OpenVPN component
Part 4 - Configs Component
5 part - Vpn component
6 part - Notify component
Part 7 - Context Component
Part 8 - Setting component
Part 9 - Callback Component
10 part - Combining all components
Part 11 - Building an Application for Windows

Source: https://habr.com/ru/post/429430/

All Articles

Own VPN client on JavaScript. Part 3 - OpenVPN component

More articles: