add proxyProtocol support for dialer

dialer/dtls/dialer.go

@@ -8,6 +8,8 @@ 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"
 	xdtls "github.com/go-gost/x/internal/util/dtls"
 	"github.com/go-gost/x/registry"
 	"github.com/pion/dtls/v2"
@@ -50,6 +52,12 @@ func (d *dtlsDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialO
 		return nil, err
 	}
 
+	conn = proxyproto.WrapClientConn(
+		d.options.ProxyProtocol,
+		ctxvalue.SrcAddrFromContext(ctx),
+		ctxvalue.DstAddrFromContext(ctx),
+		conn)
+
 	tlsCfg := d.options.TLSConfig
 	if tlsCfg == nil {
 		tlsCfg = &tls.Config{