initial commit

internal/util/ss/ss.go

@@ -0,0 +1,60 @@
+package ss
+
+import (
+	"bytes"
+	"net"
+
+	"github.com/shadowsocks/go-shadowsocks2/core"
+	ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
+)
+
+type shadowCipher struct {
+	cipher *ss.Cipher
+}
+
+func (c *shadowCipher) StreamConn(conn net.Conn) net.Conn {
+	return ss.NewConn(conn, c.cipher.Copy())
+}
+
+func (c *shadowCipher) PacketConn(conn net.PacketConn) net.PacketConn {
+	return ss.NewSecurePacketConn(conn, c.cipher.Copy())
+}
+
+func ShadowCipher(method, password string, key string) (core.Cipher, error) {
+	if method == "" && password == "" {
+		return nil, nil
+	}
+
+	c, _ := ss.NewCipher(method, password)
+	if c != nil {
+		return &shadowCipher{cipher: c}, nil
+	}
+
+	return core.PickCipher(method, []byte(key), password)
+}
+
+// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
+// we wrap around it to make io.Copy happy.
+type shadowConn struct {
+	net.Conn
+	wbuf *bytes.Buffer
+}
+
+func ShadowConn(conn net.Conn, header []byte) net.Conn {
+	return &shadowConn{
+		Conn: conn,
+		wbuf: bytes.NewBuffer(header),
+	}
+}
+
+func (c *shadowConn) Write(b []byte) (n int, err error) {
+	n = len(b) // force byte length consistent
+	if c.wbuf.Len() > 0 {
+		c.wbuf.Write(b) // append the data to the cached header
+		_, err = c.Conn.Write(c.wbuf.Bytes())
+		c.wbuf.Reset()
+		return
+	}
+	_, err = c.Conn.Write(b)
+	return
+}