挺好用的socks5庫go-socks5

1.挺好用的socks5庫

github.com/armon/go-socks5

2.示例代碼

// 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)
}

很簡潔，當然正式用不能這么用，默認是沒有認證的，也就是說所有人都能連你服務器。。

加認證也很簡單

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

	cator := UserPassAuthenticator{Credentials: cred}

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

下面詳細看一下這個認證
Config結構體:

// 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結構體里面要傳入AuthMethods
AuthMethods是一個Authenticator切片，Authenticator是個interface，

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

UserPassAuthenticator 實現了Authenticator

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

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

最后轉化為填充一個UserPassAuthenticator的Credentials ，
而Credentials 是一個map[string]string

type StaticCredentials map[string]string 

最后要把Config里面的logger 字段給填了(這里略)，就差不多能用了。

3. 適用場景

適用移動網絡訪問github慢的場景。不知道為啥移動上github總是很慢。在公司電信網絡就很快，之前家里用聯通的時候也沒這個現象，我上github你限制我干嗎。。用此socks配合瀏覽器插件foxyProxy繞過移動網絡直連github效果明顯。注意foxyProxy里面設置Patterns ，不然什么請求到服務器上繞一圈可是有點過了。。