improve ss

pkg/connector/ss/connector.go

@@ -0,0 +1,99 @@
+package ss
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/gost/pkg/connector"
+	"github.com/go-gost/gost/pkg/internal/bufpool"
+	"github.com/go-gost/gost/pkg/internal/utils"
+	"github.com/go-gost/gost/pkg/logger"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/go-gost/gost/pkg/registry"
+)
+
+func init() {
+	registry.RegiserConnector("ss", NewConnector)
+}
+
+type Connector struct {
+	md     metadata
+	logger logger.Logger
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := &connector.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &Connector{
+		logger: options.Logger,
+	}
+}
+
+func (c *Connector) Init(md md.Metadata) (err error) {
+	return c.parseMetadata(md)
+}
+
+func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	c.logger = c.logger.WithFields(map[string]interface{}{
+		"remote": conn.RemoteAddr().String(),
+		"local":  conn.LocalAddr().String(),
+		"target": address,
+	})
+	c.logger.Infof("connect: ", address)
+
+	socksAddr, err := gosocks5.NewAddr(address)
+	if err != nil {
+		c.logger.Error("parse addr: ", err)
+		return nil, err
+	}
+	rawaddr := bufpool.Get(512)
+	defer bufpool.Put(rawaddr)
+
+	n, err := socksAddr.Encode(rawaddr)
+	if err != nil {
+		c.logger.Error("encoding addr: ", err)
+		return nil, err
+	}
+
+	conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
+	defer conn.SetDeadline(time.Time{})
+
+	if c.md.cipher != nil {
+		conn = c.md.cipher.StreamConn(conn)
+	}
+
+	var sc net.Conn
+	if c.md.noDelay {
+		sc = utils.ShadowConn(conn, nil)
+		// write the addr at once.
+		if _, err := sc.Write(rawaddr[:n]); err != nil {
+			return nil, err
+		}
+	} else {
+		// cache the header
+		sc = utils.ShadowConn(conn, rawaddr[:n])
+	}
+
+	return sc, nil
+}
+
+func (c *Connector) parseMetadata(md md.Metadata) (err error) {
+	c.md.cipher, err = utils.ShadowCipher(
+		md.GetString(method),
+		md.GetString(password),
+		md.GetString(key),
+	)
+	if err != nil {
+		return
+	}
+
+	c.md.connectTimeout = md.GetDuration(connectTimeout)
+	c.md.noDelay = md.GetBool(noDelay)
+
+	return
+}