GUACAMOLE-249: Migrate loading of RDPDR support (guacdr plugin) to abstract function.

src/protocols/rdp/Makefile.am

@@ -59,6 +59,7 @@ libguac_client_rdp_la_SOURCES = \
     rdp_pointer.c               \
     rdp_settings.c              \
     rdp_stream.c                \
+    rdpdr.c                     \
     rdpsnd.c                    \
     resolution.c                \
     svc.c                       \
@@ -101,6 +102,7 @@ noinst_HEADERS =                             \
     rdp_settings.h                           \
     rdp_status.h                             \
     rdp_stream.h                             \
+    rdpdr.h                                  \
     rdpsnd.h                                 \
     resolution.h                             \
     svc.h                                    \

src/protocols/rdp/rdp.c

@@ -38,6 +38,7 @@
 #include "rdp_glyph.h"
 #include "rdp_pointer.h"
 #include "rdp_stream.h"
+#include "rdpdr.h"
 #include "rdpsnd.h"
 #include "svc.h"
 
@@ -108,17 +109,8 @@ BOOL rdp_freerdp_pre_connect(freerdp* instance) {
     if (settings->printing_enabled
         || settings->drive_enabled
         || settings->audio_enabled) {
-
+        guac_rdpdr_load_plugin(context);
-        /* Load RDPDR plugin */
-        if (guac_freerdp_channels_load_plugin(channels, instance->settings,
-                    "guacdr", client))
-            guac_client_log(client, GUAC_LOG_WARNING,
-                    "Failed to load guacdr plugin. Drive redirection and "
-                    "printing will not work. Sound MAY not work.");
-
-        /* Load RDPSND plugin */
         guac_rdpsnd_load_plugin(context);
-
     }
 
     /* Load RAIL plugin if RemoteApp in use */

src/protocols/rdp/rdpdr.c

@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include "config.h"
+#include "channels.h"
+#include "rdp.h"
+
+#include <freerdp/freerdp.h>
+#include <guacamole/client.h>
+
+void guac_rdpdr_load_plugin(rdpContext* context) {
+
+    guac_client* client = ((rdp_freerdp_context*) context)->client;
+
+    /* Load RDPDR plugin */
+    if (guac_freerdp_channels_load_plugin(context->channels, context->settings, "guacdr", client)) {
+        guac_client_log(client, GUAC_LOG_WARNING, "Support for the RDPDR "
+                "channel (device redirection) could not be loaded. Drive "
+                "redirection and printing will not work. Sound MAY not work.");
+        return;
+    }
+
+    guac_client_log(client, GUAC_LOG_DEBUG, "Support for RDPDR (device "
+        "redirection) registered. Awaiting channel connection.");
+
+}
+

src/protocols/rdp/rdpdr.h

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef GUAC_RDP_RDPDR_H
+#define GUAC_RDP_RDPDR_H
+
+#include "config.h"
+
+/**
+ * Initializes device redirection support (file transfer, printing, etc.) for
+ * RDP and handling of the RDPDR channel.  If failures occur, messages noting
+ * the specifics of those failures will be logged, and the RDP side of
+ * device redirection support will not be functional.
+ *
+ * This MUST be called within the PreConnect callback of the freerdp instance
+ * for RDPDR support to be loaded.
+ *
+ * @param rdpContext
+ *     The rdpContext associated with the FreeRDP side of the RDP connection.
+ */
+void guac_rdpdr_load_plugin(rdpContext* context);
+
+#endif
+