add proxyProtocol support for dialer

dialer/tcp/dialer.go

@@ -7,6 +7,8 @@ import (
 	"github.com/go-gost/core/dialer"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
+	ctxvalue "github.com/go-gost/x/ctx"
+	"github.com/go-gost/x/internal/net/proxyproto"
 	"github.com/go-gost/x/registry"
 )
 
@@ -15,18 +17,20 @@ func init() {
 }
 
 type tcpDialer struct {
-	md     metadata
-	logger logger.Logger
+	md      metadata
+	logger  logger.Logger
+	options dialer.Options
 }
 
 func NewDialer(opts ...dialer.Option) dialer.Dialer {
-	options := &dialer.Options{}
+	options := dialer.Options{}
 	for _, opt := range opts {
-		opt(options)
+		opt(&options)
 	}
 
 	return &tcpDialer{
-		logger: options.Logger,
+		logger:  options.Logger,
+		options: options,
 	}
 }
 
@@ -44,5 +48,12 @@ func (d *tcpDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOp
 	if err != nil {
 		d.logger.Error(err)
 	}
+
+	conn = proxyproto.WrapClientConn(
+		d.options.ProxyProtocol,
+		ctxvalue.SrcAddrFromContext(ctx),
+		ctxvalue.DstAddrFromContext(ctx),
+		conn)
+
 	return conn, err
 }