initial commit

connector/ss/connector.go

@@ -0,0 +1,111 @@
+package ss
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/gost/v3/pkg/common/bufpool"
+	"github.com/go-gost/gost/v3/pkg/connector"
+	md "github.com/go-gost/gost/v3/pkg/metadata"
+	"github.com/go-gost/gost/v3/pkg/registry"
+	"github.com/go-gost/x/internal/util/ss"
+	"github.com/shadowsocks/go-shadowsocks2/core"
+)
+
+func init() {
+	registry.ConnectorRegistry().Register("ss", NewConnector)
+}
+
+type ssConnector struct {
+	cipher  core.Cipher
+	md      metadata
+	options connector.Options
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := connector.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &ssConnector{
+		options: options,
+	}
+}
+
+func (c *ssConnector) Init(md md.Metadata) (err error) {
+	if err = c.parseMetadata(md); err != nil {
+		return
+	}
+
+	if c.options.Auth != nil {
+		method := c.options.Auth.Username()
+		password, _ := c.options.Auth.Password()
+		c.cipher, err = ss.ShadowCipher(method, password, c.md.key)
+	}
+
+	return
+}
+
+func (c *ssConnector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	log := c.options.Logger.WithFields(map[string]any{
+		"remote":  conn.RemoteAddr().String(),
+		"local":   conn.LocalAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	log.Infof("connect %s/%s", address, network)
+
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		if _, ok := conn.(net.PacketConn); ok {
+			err := fmt.Errorf("tcp over udp is unsupported")
+			log.Error(err)
+			return nil, err
+		}
+	default:
+		err := fmt.Errorf("network %s is unsupported", network)
+		log.Error(err)
+		return nil, err
+	}
+
+	addr := gosocks5.Addr{}
+	if err := addr.ParseFrom(address); err != nil {
+		log.Error(err)
+		return nil, err
+	}
+	rawaddr := bufpool.Get(512)
+	defer bufpool.Put(rawaddr)
+
+	n, err := addr.Encode(*rawaddr)
+	if err != nil {
+		log.Error("encoding addr: ", err)
+		return nil, err
+	}
+
+	if c.md.connectTimeout > 0 {
+		conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
+		defer conn.SetDeadline(time.Time{})
+	}
+
+	if c.cipher != nil {
+		conn = c.cipher.StreamConn(conn)
+	}
+
+	var sc net.Conn
+	if c.md.noDelay {
+		sc = ss.ShadowConn(conn, nil)
+		// write the addr at once.
+		if _, err := sc.Write((*rawaddr)[:n]); err != nil {
+			return nil, err
+		}
+	} else {
+		// cache the header
+		sc = ss.ShadowConn(conn, (*rawaddr)[:n])
+	}
+
+	return sc, nil
+}