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package main
import (
"crypto/tls"
"encoding/hex"
"io"
"log"
"net"
"net/http"
"os"
"time"
"github.com/things-go/go-socks5"
)
const (
debug = false
httpAddr = ":8080"
socks5Addr = ":8081"
)
func handleTunneling(w http.ResponseWriter, r *http.Request) {
log.Printf("opening tunnel to %q", r.Host)
destConn, err := net.DialTimeout("tcp", r.Host, 10*time.Second)
if err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
return
}
log.Printf("responding OK")
w.WriteHeader(http.StatusOK)
hijacker, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "Hijacking not supported", http.StatusInternalServerError)
return
}
log.Printf("hijacking HTTP connection")
clientConn, _, err := hijacker.Hijack()
if err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
}
log.Printf("starting data transfer")
go transfer(">", destConn, clientConn)
go transfer("<", clientConn, destConn)
}
func transfer(direction string, destination io.WriteCloser, source io.ReadCloser) {
defer destination.Close()
defer source.Close()
var buf [2048]byte
for {
n, err := source.Read(buf[:])
if err != nil {
log.Printf("error: %s", err)
break
}
if debug {
log.Printf("%s %02x", direction, hex.EncodeToString(buf[:n]))
}
destination.Write(buf[:n])
}
}
func main() {
log.Printf("starting HTTP proxy server on %s", httpAddr)
httpServer := &http.Server{
Addr: httpAddr,
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodConnect {
handleTunneling(w, r)
} else {
panic("invalid method, only CONNECT is allowed")
}
}),
// Disable HTTP/2.
TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),
}
log.Printf("starting SOCKS5 proxy server on %s", socks5Addr)
socks5Server := socks5.NewServer(
socks5.WithLogger(socks5.NewLogger(log.New(os.Stdout, "socks5: ", log.LstdFlags))),
)
go socks5Server.ListenAndServe("tcp", socks5Addr)
log.Fatal(httpServer.ListenAndServe())
}
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