TLS: break up the TLS layer a bit to refactor for DTLS.

This allows us to break the assumption that the bottom half is
TCP, or even an nng_stream, since the DTLS layer will use a totally
different layer.  Only nng_stream neeeds to support dial and listen.

Also: UDP: Make the sockaddr arguments to open const.

Also: Align the IPv6 address in the sockaddr (this allows for
efficient 64-bit or even 128-bit operations on these values.)

1 files changed, 31 insertions, 0 deletions

diff --git a/src/supplemental/tls/tls_stream.h b/src/supplemental/tls/tls_stream.h
new file mode 100644
index 00000000..78760f82
--- /dev/null
+++ b/src/supplemental/tls/tls_stream.h
@@ -0,0 +1,31 @@
+//
+// Copyright 2025 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+// Copyright 2019 Devolutions <info@devolutions.net>
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+#ifndef NNG_TLS_TLS_STREAM_H
+#define NNG_TLS_TLS_STREAM_H
+
+#include "core/nng_impl.h"
+#include "tls_common.h"
+
+typedef struct tls_stream_s {
+	nng_stream    stream;
+	size_t        size;
+	nni_reap_node reap;
+	nni_aio       conn_aio;
+	nni_aio      *user_aio;
+	tls_conn      conn; // NB: must be last!
+} tls_stream;
+
+extern void nni_tls_stream_free(void *arg);
+extern int  nni_tls_stream_alloc(
+     tls_stream **tsp, nng_tls_config *cfg, nng_aio *user_aio);
+
+#endif