ssl option for auto redir to https

Signed-off-by: Andy Green <andy.green@linaro.org>

changelog

@@ -161,6 +161,11 @@ There are 4 new related callbacks
 if non-NULL, the client wsi is set to be a child of parent_wsi.  This ensures
 if parent_wsi closes, then the client child is closed just before.
 
+7) If you're using SSL, there's a new context creation-time option flag
+LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS.  If you give this, non-ssl
+connections to the server listen port are accepted and receive a 301
+redirect to / on the same host and port using https://
+
 
 v1.7.0
 ======

lib/libwebsockets.h

@@ -300,6 +300,8 @@ enum lws_context_options {
 	LWS_SERVER_OPTION_VALIDATE_UTF8				= (1 << 8),
 	LWS_SERVER_OPTION_SSL_ECDH				= (1 << 9),
 	LWS_SERVER_OPTION_LIBUV					= (1 << 10),
+	LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS		= (1 << 11) |
+								  (1 << 3),
 
 	/****** add new things just above ---^ ******/
 };

lib/parsers.c

@@ -1354,9 +1354,10 @@ ping_drop:
 			eff_buf.token_len = wsi->u.ws.rx_ubuf_head;
 
 			if (lws_ext_cb_active(wsi, LWS_EXT_CB_EXTENDED_PAYLOAD_RX,
-					&eff_buf, 0) <= 0) /* not handle or fail */
+					      &eff_buf, 0) <= 0)
+				/* not handle or fail */
 				lwsl_ext("ext opc opcode 0x%x unknown\n",
-							      wsi->u.ws.opcode);
+					 wsi->u.ws.opcode);
 
 			wsi->u.ws.rx_ubuf_head = 0;
 			return 0;

lib/private-libwebsockets.h

@@ -1139,6 +1139,9 @@ struct lws {
 #ifdef _WIN32
 	unsigned int sock_send_blocking:1;
 #endif
+#ifdef LWS_OPENSSL_SUPPORT
+	unsigned int redirect_to_https:1;
+#endif
 
 	/* chars */
 #ifndef LWS_NO_EXTENSIONS

lib/server.c

@@ -146,6 +146,7 @@ _lws_server_listen_accept_flow_control(struct lws *twsi, int on)
 int
 lws_http_action(struct lws *wsi)
 {
+	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 	enum http_connection_type connection_type;
 	enum http_version request_version;
 	char content_length_str[32];
@@ -264,6 +265,33 @@ lws_http_action(struct lws *wsi)
 	lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
 			wsi->context->timeout_secs);
 
+	if (wsi->redirect_to_https) {
+		/*
+		 *  we accepted http:// only so we could redirect to
+		 * https://, so issue the redirect.  Create the redirection
+		 * URI from the host: header and ignore the path part
+		 */
+		unsigned char *start = pt->serv_buf + LWS_PRE, *p = start,
+			      *end = p + 512;
+
+		if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
+			goto bail_nuke_ah;
+		if (lws_add_http_header_status(wsi, 301, &p, end))
+			goto bail_nuke_ah;
+		n = sprintf((char *)end, "https://%s/",
+			    lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
+		if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_LOCATION,
+				end, n, &p, end))
+			goto bail_nuke_ah;
+		if (lws_finalize_http_header(wsi, &p, end))
+			goto bail_nuke_ah;
+		n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS);
+		if (n < 0)
+			goto bail_nuke_ah;
+
+		return lws_http_transaction_completed(wsi);
+	}
+
 	n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
 				    wsi->user_space, uri_ptr, uri_len);
 	if (n) {

lib/ssl.c

@@ -757,6 +757,9 @@ lws_server_socket_service_ssl(struct lws *wsi, lws_sockfd_type accept_fd)
 				SSL_shutdown(wsi->ssl);
 				SSL_free(wsi->ssl);
 				wsi->ssl = NULL;
+				if (context->options &
+				    LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS)
+					wsi->redirect_to_https = 1;
 				goto accepted;
 			}
 			if (!n) /*

test-server/test-server.c

@@ -349,6 +349,11 @@ int main(int argc, char **argv)
 			       "!DHE-RSA-AES256-SHA256:"
 			       "!AES256-GCM-SHA384:"
 			       "!AES256-SHA256";
+
+	if (use_ssl)
+		/* redirect guys coming on http */
+		info.options |= LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS;
+
 	context = lws_create_context(&info);
 	if (context == NULL) {
 		lwsl_err("libwebsocket init failed\n");