release: 1.4.4 — channel «Облако» (WebSocket via KeenDNS cloud to own Keenetic): wsgw gateway, Android 1.4.4, iOS, docs/cloud.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-31 05:16:31 +03:00
parent d795bc6f70
commit dde6403cea
38 changed files with 855 additions and 58 deletions
--- a/wsgw/main.go
+++ b/wsgw/main.go
@@ -0,0 +1,147 @@
+// wsgw: WebSocket -> UDP gateway for the PCA Phobos "Keenetic cloud" transport.
+// Keenetic `ip http proxy` (KeenDNS cloud, TLS on the router) forwards wss://<sub>/ here as plain ws.
+// One binary WS message = one obfuscated UDP packet; each WS connection gets its own UDP socket to -t.
+package main
+
+import (
+	"bufio"
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/binary"
+	"flag"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+)
+
+const wsGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
+
+func main() {
+	listen := flag.String("l", "0.0.0.0:18090", "listen addr (http)")
+	target := flag.String("t", "", "UDP target host:port (server obfuscator)")
+	flag.Parse()
+	if *target == "" {
+		log.Fatal("-t host:port required")
+	}
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if !strings.EqualFold(r.Header.Get("Upgrade"), "websocket") {
+			http.Error(w, "ok", http.StatusUpgradeRequired)
+			return
+		}
+		h, ok := w.(http.Hijacker)
+		if !ok {
+			return
+		}
+		conn, rw, err := h.Hijack()
+		if err != nil {
+			return
+		}
+		sum := sha1.Sum([]byte(r.Header.Get("Sec-WebSocket-Key") + wsGUID))
+		rw.WriteString("HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: " +
+			base64.StdEncoding.EncodeToString(sum[:]) + "\r\n\r\n")
+		rw.Flush()
+		go serve(conn, rw.Reader, *target)
+	})
+	log.Printf("wsgw %s -> udp %s", *listen, *target)
+	log.Fatal(http.ListenAndServe(*listen, nil))
+}
+
+func serve(c net.Conn, br *bufio.Reader, target string) {
+	defer c.Close()
+	u, err := net.Dial("udp", target)
+	if err != nil {
+		log.Printf("udp %s: %v", target, err)
+		return
+	}
+	defer u.Close()
+	go func() { // udp -> ws
+		buf := make([]byte, 65535)
+		for {
+			u.SetReadDeadline(time.Now().Add(5 * time.Minute))
+			n, err := u.Read(buf)
+			if err != nil {
+				c.Close()
+				return
+			}
+			if writeFrame(c, 2, buf[:n]) != nil {
+				return
+			}
+		}
+	}()
+	for { // ws -> udp
+		op, p, err := readFrame(br)
+		if err != nil {
+			return
+		}
+		switch op {
+		case 2, 0:
+			u.Write(p)
+		case 8:
+			return
+		case 9:
+			writeFrame(c, 10, p)
+		}
+	}
+}
+
+// readFrame reads one client frame (masked). Fragmented messages are not used by our clients.
+func readFrame(r *bufio.Reader) (byte, []byte, error) {
+	var h [2]byte
+	if _, err := io.ReadFull(r, h[:]); err != nil {
+		return 0, nil, err
+	}
+	n := uint64(h[1] & 0x7f)
+	switch n {
+	case 126:
+		var e [2]byte
+		if _, err := io.ReadFull(r, e[:]); err != nil {
+			return 0, nil, err
+		}
+		n = uint64(binary.BigEndian.Uint16(e[:]))
+	case 127:
+		var e [8]byte
+		if _, err := io.ReadFull(r, e[:]); err != nil {
+			return 0, nil, err
+		}
+		n = binary.BigEndian.Uint64(e[:])
+	}
+	if n > 65535 {
+		return 0, nil, io.ErrUnexpectedEOF
+	}
+	var mask [4]byte
+	masked := h[1]&0x80 != 0
+	if masked {
+		if _, err := io.ReadFull(r, mask[:]); err != nil {
+			return 0, nil, err
+		}
+	}
+	p := make([]byte, n)
+	if _, err := io.ReadFull(r, p); err != nil {
+		return 0, nil, err
+	}
+	if masked {
+		for i := range p {
+			p[i] ^= mask[i&3]
+		}
+	}
+	return h[0] & 0x0f, p, nil
+}
+
+func writeFrame(w io.Writer, op byte, p []byte) error {
+	hdr := []byte{0x80 | op, 0}
+	switch n := len(p); {
+	case n < 126:
+		hdr[1] = byte(n)
+	case n < 65536:
+		hdr[1] = 126
+		hdr = binary.BigEndian.AppendUint16(hdr, uint16(n))
+	default:
+		hdr[1] = 127
+		hdr = binary.BigEndian.AppendUint64(hdr, uint64(n))
+	}
+	_, err := w.Write(append(hdr, p...))
+	return err
+}