add ws support

obfssh/ssh.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strings"
@@ -197,9 +198,15 @@ func main() {
 	// parse environment proxy
 	updateProxyFromEnv(&cfg)
 
-	rhost := net.JoinHostPort(host, fmt.Sprintf("%d", cfg.Port))
-
 	var c net.Conn
+	var rhost string
+
+	if strings.HasPrefix(host, "ws://") || strings.HasPrefix(host, "wss://") {
+		c, err = obfssh.NewWSConn(host)
+		u, _ := url.Parse(host)
+		rhost = u.Host
+	} else {
+		rhost = net.JoinHostPort(host, fmt.Sprintf("%d", cfg.Port))
 		if cfg.Proxy.Scheme != "" && cfg.Proxy.Host != "" && cfg.Proxy.Port != 0 {
 			switch cfg.Proxy.Scheme {
 			case "http":
@@ -221,6 +228,7 @@ func main() {
 			log.Debugf("dail to %s", rhost)
 			c, err = dialer.Dial("tcp", rhost)
 		}
+	}
 
 	if err != nil {
 		log.Fatal(err)

ws.go

@@ -0,0 +1,110 @@
+package obfssh
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/fangdingjun/go-log/v5"
+	"github.com/gorilla/websocket"
+)
+
+type wsConn struct {
+	*websocket.Conn
+	buf *bytes.Buffer
+	mu  *sync.Mutex
+	ch  chan struct{}
+}
+
+var _ net.Conn = &wsConn{}
+
+// NewWSConn dial to websocket server and return net.Conn
+func NewWSConn(p string) (net.Conn, error) {
+	conn, resp, err := websocket.DefaultDialer.Dial(p, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp.Body.Close()
+
+	if resp.StatusCode != http.StatusSwitchingProtocols {
+		return nil, fmt.Errorf("http status %d", resp.StatusCode)
+	}
+
+	c := &wsConn{Conn: conn,
+		buf: bytes.NewBuffer(nil),
+		mu:  new(sync.Mutex),
+		ch:  make(chan struct{}),
+	}
+
+	go c.readLoop()
+
+	return c, nil
+}
+
+func (wc *wsConn) readLoop() {
+	for {
+		_, data, err := wc.ReadMessage()
+		if err != nil {
+			log.Debugln(err)
+			close(wc.ch)
+			break
+		}
+
+		wc.mu.Lock()
+		wc.buf.Write(data)
+		wc.mu.Unlock()
+
+		select {
+		case wc.ch <- struct{}{}:
+		default:
+		}
+	}
+}
+
+func (wc *wsConn) Read(buf []byte) (int, error) {
+	wc.mu.Lock()
+
+	n, err := wc.buf.Read(buf)
+	if err == nil {
+		wc.mu.Unlock()
+		return n, err
+	}
+
+	wc.mu.Unlock()
+
+	if err != io.EOF {
+		return 0, err
+	}
+
+	// EOF, no data avaliable, read again
+	select {
+	case _, ok := <-wc.ch:
+		if !ok {
+			return 0, errors.New("connection closed")
+		}
+	}
+
+	wc.mu.Lock()
+	defer wc.mu.Unlock()
+	return wc.buf.Read(buf)
+}
+
+func (wc *wsConn) Write(buf []byte) (int, error) {
+	err := wc.WriteMessage(websocket.BinaryMessage, buf)
+	return len(buf), err
+}
+
+func (wc *wsConn) SetDeadline(t time.Time) error {
+	if err := wc.SetReadDeadline(t); err != nil {
+		return err
+	}
+	if err := wc.SetWriteDeadline(t); err != nil {
+		return err
+	}
+	return nil
+}