// listen 1080 and act as socks server
// support socks4, socks4a and socks5

package main

import (
    socks "github.com/fangdingjun/socks-go"
    "log"
    "net"
    "time"
)

func main() {
    conn, err := net.Listen("tcp", ":1080")
    if err != nil {
        log.Fatal(err)
    }

    for {
        c, err := conn.Accept()
        if err != nil {
            log.Println(err)
            continue
        }

        log.Printf("connected from %s", c.RemoteAddr())

        d := net.Dialer{Timeout: 10 * time.Second}
        s := socks.Conn{Conn: c, Dial: d.Dial}
        go s.Serve()
    }
}

// visit https://www.google.com through socks proxy server

package main

import (
    "bufio"
    "crypto/tls"
    socks "github.com/fangdingjun/socks-go"
    "io"
    "log"
    "net"
    "net/http"
    "os"
)

func main() {
    // connect to socks server
    c, err := net.Dial("tcp", "localhost:1080")
    if err != nil {
        log.Fatal(err)
    }
    defer c.Close()

    sc := &socks.Client{Conn: c}

    // connect to remote server
    if err := sc.Connect("www.google.com", 443); err != nil {
        log.Fatal(err)
    }

    // tls
    conn := tls.Client(sc, &tls.Config{ServerName: "www.google.com"})
    if err := conn.Handshake(); err != nil {
        log.Fatal(err)
    }

    // send http request
    req, err := http.NewRequest("GET", "https://www.google.com/", nil)
    if err != nil {
        log.Fatal(err)
    }
    req.Write(conn)

    bio := bufio.NewReader(conn)

    // read response
    res, err := http.ReadResponse(bio, req)
    if err != nil {
        log.Fatal(err)
    }
    defer res.Body.Close()

    io.Copy(os.Stdout, res.Body)
}