Proxytool

Lighweight utility for wrapping a SOCKSv5 proxy with an HTTP(S) proxy.

Usage

## Download and build
go get github.com/klustic/proxytool
go build github.com/klustic/proxytool

## Usage
$ ./proxytool -h
Usage of ./proxytool:
  -http string
    	Where to set up the HTTP/HTTPS proxy (default "127.0.0.1:8080")
  -socks string
    	Location of SOCKS proxy (default "127.0.0.1:1080")
  -verbose
    	Toggle verbose logging to STDOUT (default true)


$ ./proxytool 
Listening for HTTP/HTTPS proxy connections and forwarding through SOCKS proxy.
- HTTP/HTTPS proxy ..: 127.0.0.1:8080
- SOCKSv5 proxy .....: 127.0.0.1:1080
- DNS resolutions ...: remote (not currently configurable)

2020/11/06 15:30:16 [001] INFO: Got request / icanhazip.com GET http://icanhazip.com/
2020/11/06 15:30:16 [001] INFO: Sending request GET http://icanhazip.com/
2020/11/06 15:30:17 [001] INFO: Received response 200 OK
2020/11/06 15:30:17 [001] INFO: Copying response to client 200 OK [200]
2020/11/06 15:30:17 [001] INFO: Copied 14 bytes to client error=<nil>
...

Use Case: docker pull through SOCKSv5 Tunnel

These steps assume you have a SOCKS proxy listening on 127.0.0.1:1080, and Proxytool listening on 127.0.0.1:8080.

Docker does not provide native SOCKS proxy support, but it does provide HTTP/S proxy support. So you can use this tool to wrap your SOCKSv5 proxy with Proxytool as follows:

Step 1: Add proxy settings for the docker daemon

Since images are pulled by the daemon and not the docker cli directly, you have to add daemon configurations for Proxytool and reload systemd:

# [root]# vim /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://127.0.0.1:8080"
Environment="HTTPS_PROXY=http://127.0.0.1:8080"

Then reload systemd:

[root]# systemctl daemon-reload

[OPTIONAL] Step 2: Trust TLS certificates on the docker repository

This is required if the repo's TLS certificate doesn't have a valid trust chain:

[root]# vim /etc/docker/daemon.json
{
  "insecure-registries" : ["repo.internal.example.com"]
}
[root]# service docker restart

Step 3: Pull container

docker pull repo.internal.example.com/core/container-with-all-the-secrets:latest