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CYarp

A reverse proxy toolkit to help you expose multiple local http servers behind a NAT or firewall to the internet. It currently supports four connection methods: HTTP/1.1 Upgrade, HTTP/2 Extended CONNECT, WebSocket and WebSocket over Http/2.

Features

1. Use high-performance kestrel as server
2. Use high-performance YARP for http forwarding
3. Designed as middleware for asp.netcore
4. Open server-client interaction protocol
5. Provides .NET, C/C++ client libraries

Network structure

Apache Bench

Nginx, CYarp and frp_0.56.0 are deployed simultaneously on an Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz CentOS Linux 7 (Core) system machine. The ab tool for testing is on another machine on the LAN. The test sequence is the parameter order from top to bottom of the table.

ab -c 1 -n 10000

ab -c 10 -n 50000

ab -c 20 -n 100000

ab -c 50 -n 200000

ab -c 100 -n 500000

Demo and experience

1. Run the Host/CYarpServer project
2. Run the Host/CYarpClient project
3. When PostMan requests http://localhost, it receives 401 authorization failed
4. Add PostMan's Auth, select Bearer Token, and use the following test token to request

test token

eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJodHRwOi8vc2NoZW1hcy5taWNyb3NvZnQuY29tL3dzLzIwMDgvMDYvaWRlbnRpdHkvY2xhaW1zL3JvbGUiOiJNb2JpbGUiLCJodHRwOi8vc2NoZW1hcy54bWxzb2FwLm9yZy93cy8yMDA1LzA1L2lkZW50aXR5L2NsYWltcy9zaWQiOiJNb2JpbGUwMDEiLCJDbGllbnRJZCI6IkNsaWVudDAwMSIsImlhdCI6MTcxMDgxNjQ1MiwibmJmIjoxNzEwODE2NDUyLCJleHAiOjI3MTA5MDI4NTJ9.aC-9pVDvyhXsUub-wzZVttfc34wMtFrARDlUj3BYNFhy3Axr0U93CV_QFUP-m6DYI6gK0HkxUr6xlkWwItIFzvS95TsoMXOARVXlVQEP18_wQRQ0G3WRMmNJ_uElJ4uIcrha_Dr4e0cp38olHdABQgOXZgUNHFAHCY3rqtn6-gyTaTu6qAgoj2imi4tsOYFF_OPrCNkRoJavubzDTTXRB95cGz5kxzTSDdWCuIaktNsWN7WDK864VKyVgwca6ueQJogidvES_x26TZuLF6VNhYEkM6UjUZtT8WiD3nBhi2_dVS7BODMLfSyiFa68k1NK50DDfnYgiFU6Clb24Ra-2A

Development Guide

Server side

The CYarp.Server package is designed as an http middleware for asp.net core. By default, it relies on the Authentication middleware to verify the IClient connection. Use the following methods to register and configure the middleware.

builder.Services.AddAuthentication(<DefaultScheme>).AddYourScheme();
builder.Services.AddCYarp().Configure(cyarp=>{ ... });

var app = builder.Build();
app.UseAuthentication();
app.UseCYarp();
...
// app.UseAuthorization();
// app.MapControllers();
app.Run();

Authentication and authorization when connecting to IClient can be skipped using the following method

builder.Services.AddCYarp().Configure(cyarp=>{ ... });

var app = builder.Build();
app.UseCYarp().AllowAnonymous();
... 

Finally, handle the http forwarding in the Controller, endpoint handler or the last custom middleware.

// Authorization verification of the requester, here the role is verified
[Authorize(Roles = "Mobile")]
public class CYarpController : ControllerBase
{ 
    private static readonly string clientIdClaimType = "ClientId";

    /// <summary>
    /// Handle cyarp
    /// The core operation is to get the clientId from the request context
    /// Then use clientId to get IClient from IClientViewer service to forward HttpContext
    /// </summary>
    /// <param name="clientViewer"></param>
    /// <returns></returns>
    [Route("/{**cyarp}")]
    public async Task InvokeAsync([FromServices] IClientViewer clientViewer)
    {
        var clientId = this.User.FindFirstValue(clientIdClaimType);
        if (clientId != null && clientViewer.TryGetValue(clientId, out var client))
        {
            this.Request.Headers.Remove(HeaderNames.Authorization);
            await client.ForwardHttpAsync(this.HttpContext);
        }
        else
        {
            this.Response.StatusCode = StatusCodes.Status502BadGateway;
        }
    }
}

Client side

Using the CYarp.Client package, you can develop the client by .NET as follows

var options = this.clientOptions.CurrentValue;
using var client = new CYarpClient(options);
await client.TransportAsync(stoppingToken);

For C and C++ clients, you can AOT compile the source code of the CYarp.Client project into a dynamic shared library exported from C for use. The Host/CYarpClient.Native project is a C and C++ client demo, and you need to run Host/CYarpServer first for the server.

The following are the dynamic shared library commands exported by AOT compilation into C for the CYarp.Client project

CYarp protocol

Interaction process

Establish a long connection

by HTTP/1.1

Client initiates the following request

Get / HTTP/1.1
Connection: Upgrade
Upgrade: CYarp
Authorization：{Client identity information}
CYarp-TargetUri: {Access Uri of target httpServer}

If the server authentication passes, it will respond with a 101 status code, and if the identity authentication fails, it will respond with a 401 status code. In addition, the response may also carry the Set-Cookie response header.

HTTP/1.1 101 Switching Protocols
Connection: Upgrade
Set-Cookie: <load balancer cookie>

At this time, the long connection based on tcp has been completed. Then the Stream following the long connection must implement the functions of the following table, where {tunnelId} is a 36-character guid format text, such as c0248b3a-171c-1e9c-e75c-188daf5e773f.

by HTTP/2

Client initiates the following request

:method = CONNECT
:protocol = CYarp
:scheme = https
:path = /
authorization = {Client identity information}
cyarp-targeturi = {Access Uri of target httpServer}

If the server authentication passes, it will respond with a 200 status code, and if the identity authentication fails, it will respond with a 401 status code. In addition, the response may also carry the set-cookie response header.

:status = 200
set-cookie = <load balancer cookie>

At this time, the long connection based on HTTP/2 has been completed. Then the Stream following the long connection must implement the functions of the following table, where {tunnelId} is a 36-character guid format text, such as c0248b3a-171c-1e9c-e75c-188daf5e773f.

by WebSocket

WebSocket connection requires the following request header, requesting the / path. After the connection is successful, multiple binary frames are used to carry CYarp's Stream.

Creation of HttpTunnel

by HTTP/1.1

Client send the following request

Get /{tunnelId} HTTP/1.1
Connection: Upgrade
Upgrade: CYarp
Cookie：<if have Set-Cookie>

If the server passes the verification {tunnelId}, it will respond with a 101 status code. If the verification fails, it will respond with a 401 status code. In addition, the response may also carry the Set-Cookie response header.

HTTP/1.1 101 Switching Protocols
Connection: Upgrade
Set-Cookie: <load balancer cookie>

At this time, the creation of the HttpTunnel over tcp has been completed, and then the server will send an HTTP/1.1 request to the client and receive the client's HTTP/1.1 response in the subsequent Stream.

by HTTP/2

Client send the following request

:method = CONNECT
:protocol = CYarp
:scheme = https
:path = /{tunnelId}
cookie = <if have set-cookie>

If the server passes the verification {tunnelId}, it will respond with a 200 status code. If the verification fails, it will respond with a 401 status code. In addition, the response may also carry the set-cookie response header.

:status = 200
set-cookie = <load balancer cookie>

At this time, the creation of the HttpTunnel over HTTP/2 has been completed, and then the server will send an HTTP/1.1 request to the client and receive the client's HTTP/1.1 response in the subsequent Stream.

by WebSocket

WebSocket connection requires the following request header, requesting the /{tunnelId} path. After the connection is successful, multiple binary frames are used to carry CYarp's Stream.

Security

When the server side uses https, the following parts are tls secure transmission

1. The long connection establishment process and the subsequent Stream of the long connection
2. The creation process of HttpTunnel and its subsequent Stream

If the TargetUri of the http server is also https, the traffic in HttpTunnel will appear as tls in tls.