socks5 搭建代理服务

go env -w GO111MODULE=auto
go env -w GOPROXY=https://goproxy.cn,direct

go get -u github.com/oov/socks5

package main
import (
  "github.com/oov/socks5"
  "log"
)
func main() {
  srv := socks5.New()
  srv.AuthUsernamePasswordCallback = func(c *socks5.Conn, username, password []byte) error {
    /*账号密码验证*/
    user := string(username)
    passwd := string(password)
    if !((user == "guest" && passwd == "test1234") || (user == "root" && passwd == "test1234")) {
      return socks5.ErrAuthenticationFailed
    }
    log.Printf("Welcome %v!", user)
    c.Data = user
    return nil
  }
  /*代理黑名单*/
  srv.HandleConnectFunc(func(c *socks5.Conn, host string) (newHost string, err error) {
    if host == "example.com:80" {
      return host, socks5.ErrConnectionNotAllowedByRuleset
    }
    if user, ok := c.Data.(string); ok {
      log.Printf("%v connecting to %v", user, host)
    }
    return host, nil
  })
  srv.HandleCloseFunc(func(c *socks5.Conn) {
    if user, ok := c.Data.(string); ok {
      log.Printf("Goodbye %v!", user)
    }
  })
  /*监听8070端口*/
  srv.ListenAndServe(":8070")
}

go build main.go