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proxy.go
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proxy.go
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// Copyright (c) 2021 Blacknon. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
package sshlib
import (
"bufio"
"context"
"fmt"
"log"
"net"
"net/http"
"net/url"
"os/exec"
"golang.org/x/net/proxy"
)
type ProxyDialer interface {
Dial(network, addr string) (net.Conn, error)
DialContext(ctx context.Context, network, addr string) (net.Conn, error)
}
type ContextDialer struct {
Dialer proxy.Dialer
}
func (c *ContextDialer) GetDialer() proxy.Dialer {
return c.Dialer
}
func (c *ContextDialer) Dial(network, addr string) (net.Conn, error) {
return c.Dialer.Dial(network, addr)
}
func (c *ContextDialer) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
// Simply call the DialContext method if supported
if dialerCtx, ok := c.Dialer.(interface {
DialContext(context.Context, string, string) (net.Conn, error)
}); ok {
return dialerCtx.DialContext(ctx, network, addr)
}
// Fallback if DialContext is not supported
connChan := make(chan net.Conn, 1)
errChan := make(chan error, 1)
go func() {
conn, err := c.Dialer.Dial(network, addr)
if err != nil {
errChan <- err
return
}
connChan <- conn
}()
select {
case conn := <-connChan:
return conn, nil
case err := <-errChan:
return nil, err
case <-ctx.Done():
return nil, ctx.Err()
}
}
type Proxy struct {
// Type set proxy type.
// Can specify `http`, `https`, `socks`, `socks5`, `command`.
//
// It is read at the time of specification depending on the type.
Type string
// Addr set proxy address.
//
Addr string
// Port set proxy port.
//
Port string
// Port set proxy user.
//
User string
// Port set proxy user.
//
Password string
// Command only use Type `command`.
//
Command string
// Forwarder set Dialer.
Forwarder ProxyDialer
}
// CreateProxyDialer retrun ProxyDialer.
func (p *Proxy) CreateProxyDialer() (proxyContextDialer ProxyDialer, err error) {
var proxyDialer proxy.Dialer
switch p.Type {
case "http", "https":
proxyDialer, err = p.CreateHttpProxyDialer()
case "socks", "socks5":
proxyDialer, err = p.CreateSocks5ProxyDialer()
case "command":
proxyDialer, err = p.CreateProxyCommandProxyDialer()
}
proxyContextDialer = &ContextDialer{Dialer: proxyDialer}
return
}
// CreateHttpProxy return ProxyDialer as http proxy.
func (p *Proxy) CreateHttpProxyDialer() (proxyDialer proxy.Dialer, err error) {
// Regist dialer
proxy.RegisterDialerType("http", newHttpProxy)
proxy.RegisterDialerType("https", newHttpProxy)
proxyURL := p.Type + ":https://" + p.Addr
if p.User != "" && p.Password != "" {
proxyURL = p.Type + ":https://" + p.User + ":" + p.Password + "@" + p.Addr
}
if p.Port != "" {
proxyURL = proxyURL + ":" + string(p.Port)
}
proxyURI, _ := url.Parse(proxyURL)
var forwarder proxy.Dialer
forwarder = proxy.Direct
if p.Forwarder != nil {
forwarder = p.Forwarder
}
proxyDialer, err = proxy.FromURL(proxyURI, forwarder)
return
}
// CreateSocks5Proxy return ProxyDialer as Socks5 proxy.
func (p *Proxy) CreateSocks5ProxyDialer() (proxyDialer proxy.Dialer, err error) {
var proxyAuth *proxy.Auth
if p.User != "" && p.Password != "" {
proxyAuth.User = p.User
proxyAuth.Password = p.Password
}
var forwarder ProxyDialer
forwarder = proxy.Direct
if p.Forwarder != nil {
forwarder = p.Forwarder
}
return proxy.SOCKS5("tcp", net.JoinHostPort(p.Addr, p.Port), proxyAuth, forwarder)
}
// CreateProxyCommandProxyDialer as ProxyCommand.
// When passing ProxyCommand, replace %h, %p and %r etc...
func (p *Proxy) CreateProxyCommandProxyDialer() (proxyDialer proxy.Dialer, err error) {
np := new(NetPipe)
np.Command = p.Command
proxyDialer = np
return
}
type NetPipe struct {
Command string
ctx context.Context
Cmd *exec.Cmd
}
func (n *NetPipe) Dial(network, addr string) (con net.Conn, err error) {
network = ""
addr = ""
// Create net.Pipe(), and set proxyCommand
con, srv := net.Pipe()
n.Cmd = exec.Command("sh", "-c", n.Command)
// setup FD
n.Cmd.Stdin = srv
n.Cmd.Stdout = srv
n.Cmd.Stderr = log.Writer()
// Start the command
err = n.Cmd.Start()
// Close the write end of the pipe
go func() {
n.Cmd.Wait()
srv.Close()
}()
return
}
func (n *NetPipe) DialContext(ctx context.Context, network, addr string) (con net.Conn, err error) {
connChan := make(chan net.Conn, 1)
errChan := make(chan error, 1)
go func() {
conn, err := n.Dial(network, addr)
if err != nil {
errChan <- err
return
}
connChan <- conn
}()
select {
case conn := <-connChan:
return conn, nil
case err := <-errChan:
return nil, err
case <-ctx.Done():
n.Cmd.Process.Kill()
return nil, ctx.Err()
}
}
type httpProxy struct {
host string
haveAuth bool
username string
password string
forward proxy.Dialer
}
// Dial return net.Conn via http proxy.
func (s *httpProxy) Dial(network, addr string) (net.Conn, error) {
c, err := s.forward.Dial("tcp", s.host)
if err != nil {
return nil, err
}
reqURL, err := url.Parse("https://" + addr)
if err != nil {
c.Close()
return nil, err
}
reqURL.Scheme = ""
req, err := http.NewRequest("CONNECT", reqURL.String(), nil)
if err != nil {
c.Close()
return nil, err
}
req.Close = false
if s.haveAuth {
req.SetBasicAuth(s.username, s.password)
}
req.Header.Set("User-Agent", "Poweredby Golang")
err = req.Write(c)
if err != nil {
c.Close()
return nil, err
}
resp, err := http.ReadResponse(bufio.NewReader(c), req)
if err != nil {
resp.Body.Close()
c.Close()
return nil, err
}
resp.Body.Close()
if resp.StatusCode != 200 {
c.Close()
err = fmt.Errorf("Connect server using proxy error, StatusCode [%d]", resp.StatusCode)
return nil, err
}
return c, nil
}
// newHttpProxy
func newHttpProxy(uri *url.URL, forward proxy.Dialer) (proxy.Dialer, error) {
s := new(httpProxy)
s.host = uri.Host
s.forward = forward
if uri.User != nil {
s.haveAuth = true
s.username = uri.User.Username()
s.password, _ = uri.User.Password()
}
return s, nil
}