挺好用的socks5库go-socks5

1.挺好用的socks5库

github.com/armon/go-socks5

2.示例代码

// Create a SOCKS5 server
conf := &socks5.Config{}
server, err := socks5.New(conf)
if err != nil {
  panic(err)
}

// Create SOCKS5 proxy on localhost port 8000
if err := server.ListenAndServe("tcp", "127.0.0.1:8000"); err != nil {
  panic(err)
}

很简洁，当然正式用不能这么用，默认是没有认证的，也就是说所有人都能连你服务器。。

加认证也很简单

cred := StaticCredentials{
		"foo": "bar",
	}

	cator := UserPassAuthenticator{Credentials: cred}

	s, _ := New(&Config{AuthMethods: []Authenticator{cator}})

下面详细看一下这个认证
Config结构体:

// Config is used to setup and configure a Server
type Config struct {
	// AuthMethods can be provided to implement custom authentication
	// By default, "auth-less" mode is enabled.
	// For password-based auth use UserPassAuthenticator.
	AuthMethods []Authenticator

	// If provided, username/password authentication is enabled,
	// by appending a UserPassAuthenticator to AuthMethods. If not provided,
	// and AUthMethods is nil, then "auth-less" mode is enabled.
	Credentials CredentialStore

	// Resolver can be provided to do custom name resolution.
	// Defaults to DNSResolver if not provided.
	Resolver NameResolver

	// Rules is provided to enable custom logic around permitting
	// various commands. If not provided, PermitAll is used.
	Rules RuleSet

	// Rewriter can be used to transparently rewrite addresses.
	// This is invoked before the RuleSet is invoked.
	// Defaults to NoRewrite.
	Rewriter AddressRewriter

	// BindIP is used for bind or udp associate
	BindIP net.IP

	// Logger can be used to provide a custom log target.
	// Defaults to stdout.
	Logger *log.Logger

	// Optional function for dialing out
	Dial func(ctx context.Context, network, addr string) (net.Conn, error)
}

config结构体里面要传入AuthMethods
AuthMethods是一个Authenticator切片，Authenticator是个interface，

type Authenticator interface {
	Authenticate(reader io.Reader, writer io.Writer) (*AuthContext, error)
	GetCode() uint8
}

UserPassAuthenticator 实现了Authenticator

// UserPassAuthenticator is used to handle username/password based
// authentication
type UserPassAuthenticator struct {
	Credentials CredentialStore
}

func (a UserPassAuthenticator) GetCode() uint8 {
	return UserPassAuth
}

最后转化为填充一个UserPassAuthenticator的Credentials ，
而Credentials 是一个map[string]string

type StaticCredentials map[string]string 

最后要把Config里面的logger 字段给填了(这里略)，就差不多能用了。

3. 适用场景

适用移动网络访问github慢的场景。不知道为啥移动上github总是很慢。在公司电信网络就很快，之前家里用联通的时候也没这个现象，我上github你限制我干吗。。用此socks配合浏览器插件foxyProxy绕过移动网络直连github效果明显。注意foxyProxy里面设置Patterns ，不然什么请求到服务器上绕一圈可是有点过了。。