[Feature Request] Missing utls for SIP003 v2ray transport

[zedifen]

According to sing-box documentation, utls can be configured in tls settings.

However, when using shadowsocks with v2ray-plugin (v2ray WebSocket transport) with TLS, it seems the only way to make configuration is through plugin_opts.

I understand that sing-box is now using its built-in v2ray-plugin support, and by checking the source code (transport/sip003/v2ray.go), it's clear that there's no utls-related code in it.

Luckily, it's not hard to attach an option.OutboundUTLSOptions to the existing tlsOptions. I made a simple patch as below and it's working.

diff --git a/transport/sip003/v2ray.go b/transport/sip003/v2ray.go
index c142180bbf..078adea278 100644
--- a/transport/sip003/v2ray.go
+++ b/transport/sip003/v2ray.go
@@ -25,6 +25,13 @@ func newV2RayPlugin(ctx context.Context, pluginOpts Args, router adapter.Router,
 	if _, loaded := pluginOpts.Get("tls"); loaded {
 		tlsOptions.Enabled = true
 	}
+	if utlsFingerprint, utlsLoaded := pluginOpts.Get("utls"); utlsLoaded {
+		tlsOptions.Enabled = true
+		tlsOptions.UTLS = &option.OutboundUTLSOptions{
+			Enabled:     true,
+			Fingerprint: utlsFingerprint,
+		}
+	}
 	if certPath, certLoaded := pluginOpts.Get("cert"); certLoaded {
 		tlsOptions.CertificatePath = certPath
 	}