fixes #166 Websocket TLS mapping

This introduces the wss:// scheme, which is available and works like
the ws:// scheme if TLS is enabled in the library.

The library modularization is refactored somewhat, to make it easier
to use.  There is now a single NNG_ENABLE_TLS that enables TLS support
under the hood.

This also adds a new option for the TLS transport, NNG_OPT_TLS_CONFIG
(and a similar one for WSS, NNG_OPT_TLS_WSS_CONFIG) that offer access
to the underlying TLS configuration object, which now has a public API
to go with it as well.

Note that it is also possible to use pure HTTPS using the *private*
API, which will be exposed in a public form soon.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/core/options.h b/src/core/options.h
index d373851f..e9aa16dd 100644
--- a/src/core/options.h
+++ b/src/core/options.h
@@ -58,6 +58,9 @@ extern int nni_setopt_size(size_t *, const void *, size_t, size_t, size_t);
 // nni_getopt_size obtains a size_t option.
 extern int nni_getopt_size(size_t, void *, size_t *);
 
+// nni_getopt_ptr obtains a pointer option.
+extern int nni_getopt_ptr(void *, void *, size_t *);
+
 extern int nni_chkopt_ms(const void *, size_t);
 extern int nni_chkopt_int(const void *, size_t, int, int);
 extern int nni_chkopt_size(const void *, size_t, size_t, size_t);