go-get-proxied - Cross platform proxy configurations

Go code (golang) package which facilitates the retrieval of system proxy configurations.

Installation

• Install this package using go get github.com/rapid7/go-get-proxied
• Or, simply import go get github.com/rapid7/go-get-proxied, and use dep ensure to include it in your package

Usage:

package main
import (
    "fmt"
    "github.com/rapid7/go-get-proxied/proxy"
)
func main() {
    p := proxy.NewProvider("").Get("https", "https://rapid7.com")
    if p != nil {
        fmt.Printf("Found proxy: %s\n", p)
    }
}

Command Line Usage:

> ./go-get-proxied -h
Usage of ./go-get-proxied:
  -c string
    	Optional. Path to configuration file.
  -j	Optional. If a proxy is found, write it as JSON instead of a URL.
  -l	Optional. If set, a list of proxy will be returned.
  -p string
    	Optional. The proxy protocol you wish to lookup. Default: https (default "https")
  -t string
    	Optional. Target URL which the proxy will be used for. Default: *
  -v	Optional. If set, log content will be sent to stderr.

> netsh winhttp set proxy testProxy:8999

Current WinHTTP proxy settings:

    Proxy Server(s) :  testProxy:8999
    Bypass List     :  (none)
> ./go-get-proxied
//testProxy:8999
> ./go-get-proxied -j
{
   "host": "testProxy",
   "password": null,
   "port": 8999,
   "protocol": "",
   "src": "WinHTTP:WinHttpDefault",
   "username": null
}

> echo '{"https":"http://testProxy:8999"}' > proxy.config
> ./go-get-proxied -c proxy.config
http://testProxy:8999
> ./go-get-proxied -c proxy.config -j
{
   "host": "testProxy",
   "password": null,
   "port": 8999,
   "protocol": "http",
   "src": "ConfigurationFile",
   "username": null
}

Configuration:

The priority of retrieval is the following.

• Windows:
  • Configuration File
  • Environment Variable: HTTPS_PROXY, HTTP_PROXY, FTP_PROXY, or ALL_PROXY. NO_PROXY is respected.
  • Internet Options: Automatically detect settings (WPAD)
  • Internet Options: Use automatic configuration script (PAC)
  • Internet Options: Manual proxy server
  • WINHTTP: (netsh winhttp)
• Linux:
  • Configuration File
  • Environment Variable: HTTPS_PROXY, HTTP_PROXY, FTP_PROXY, or ALL_PROXY. NO_PROXY is respected.
• MacOS:
  • Configuration File
  • Environment Variable: HTTPS_PROXY, HTTP_PROXY, FTP_PROXY, or ALL_PROXY. NO_PROXY is respected.
  • Network Settings: scutil