Categorygithub.com/dsundquist/gotestserver
modulepackage
0.0.0-20240925231811-673c64f8273e
Repository: https://github.com/dsundquist/gotestserver.git
Documentation: pkg.go.dev

# README

<html>
<head>
    <meta charset="UTF-8">
    <title>GoTestServer</title>
    <style>

/* From extension vscode.github / /---------------------------------------------------------------------------------------------

  • Copyright (c) Microsoft Corporation. All rights reserved.
  • Licensed under the MIT License. See License.txt in the project root for license information. --------------------------------------------------------------------------------------------/

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    <h1 id="gotestserver">GoTestServer</h1>

This tool was designed for troubleshooting requests when behind a reverse proxy, primarily Cloudflare. It is a personal project that I use as a Technical Support Engineer. It can also be placed behind Cloudflare Access and cloudflared Tunnels for troubleshooting.

There are 4 certs that are included as examples, please delete these if you're running this in production

Install

Install Go: Go - Download and install

go install github.com/dsundquist/gotestserver@latest

Usage

To run the basic webserver (assuming that you haven't yet added ~/go/bin directory to your path, and that you'll be using the default port 80 which will require sudo):

sudo ~/go/bin/gotestserver serve

If you wish to not use the default port of 80, you can start the http server on alternate port using the -p flag.

~/go/bin/gotestserver serve -p 8080

If you want to run an https server you can use the defaults that are included in the repo. You should replace these with the following:

openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out server.csr openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

The 2x files server.crt and server.key should be in the same directory has ./gotestserver:

* local_directory: |-> gotestserver | |-> server.crt |-> server.key

Then one can run the serve command with a -s flag:

sudo ~/go/bin/gotestserver serve -s

The CLI is built from Cobra, to see additional usage use the --help flag:

./gotestserver serve --help

HTTP Server Behavior

The main page will serve ./index.html.

Any pages that are not found, (besides the /public directory, which acts as a normal webserver) will return the request headers.

This can be useful for analysis when behind a reverse proxy or a product like Cloudflared

The 522 Error Page

A 522 error is defined here: Cloudflare Support - 522 Error

The error occurs at the network level when:

  1. Before a connection is established, the origin web server does not return a SYN+ACK to Cloudflare within 15 seconds of Cloudflare sending a SYN.
  2. After a connection is established, the origin web server doesn’t acknowledge (ACK) Cloudflare’s resource request within 90 seconds.

Therefore we cannot complete this from the same server, as we need to sabatoge the server at the network level. In my implementation I have another simple http server listening on port 80, in which I'm redirect requests over to. At that server I've added an iptables drop rule that is dropping all ack packets to the listening port, recreated #2 above.

dsundquist:~$ sudo iptables -S -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -A INPUT -i eth1 -p tcp -m tcp --dport 80 -j DROP -A INPUT -i eth0 -p tcp -m tcp --dport 80 -j DROP

For that sabatoged HTTP server, I also have it programmed to 30 seconds, and two routes to reach it, one via its normal IP address (behind Cloudflare) and one over a cloudflared tunnel

Todo

  • Add more to the client side, this is still up in the air what will happen here.

  • Workers for some routes, worker serve the index.html??

  • Read from a config.yaml file SPF13 - Viper

  • Implement QUIC, https://pkg.go.dev/github.com/lucas-clemente/quic-go/http3 <- seems bit overly complicated

  • Document:

    • logging to a file s
    • mTLS
    • http1.1
    • Necessary file structure for all functions to work
    • The public folder
    • debugging
    • Client and its uselessness
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Copyright © 2022 Dean Sundquist [email protected] */.