GUACAMOLE-25: Add stub "guacai" plugin for AUDIO_INPUT channel support.

src/protocols/rdp/Makefile.am

@@ -24,6 +24,7 @@ lib_LTLIBRARIES = libguac-client-rdp.la
 
 libguac_client_rdp_la_SOURCES = \
     _generated_keymaps.c        \
+    audio_input.c               \
     client.c                    \
     input.c                     \
     rdp.c                       \
@@ -44,6 +45,9 @@ libguac_client_rdp_la_SOURCES = \
     unicode.c                   \
     user.c
 
+guacai_sources =         \
+    guac_ai/ai_service.c
+
 guacsvc_sources =          \
     guac_svc/svc_service.c \
     rdp_svc.c
@@ -68,6 +72,7 @@ guacdr_sources =                             \
 noinst_HEADERS =                             \
     compat/client-cliprdr.h                  \
     compat/rail.h                            \
+    guac_ai/ai_service.h                     \
     guac_rdpdr/rdpdr_fs_messages.h           \
     guac_rdpdr/rdpdr_fs_messages_dir_info.h  \
     guac_rdpdr/rdpdr_fs_messages_file_info.h \
@@ -79,6 +84,7 @@ noinst_HEADERS =                             \
     guac_rdpsnd/rdpsnd_messages.h            \
     guac_rdpsnd/rdpsnd_service.h             \
     guac_svc/svc_service.h                   \
+    audio_input.h                            \
     client.h                                 \
     input.h                                  \
     rdp.h                                    \
@@ -104,6 +110,7 @@ noinst_HEADERS =                             \
 if ! ENABLE_WINPR
 noinst_HEADERS  += compat/winpr-stream.h compat/winpr-wtypes.h
 libguac_client_rdp_la_SOURCES += compat/winpr-stream.c
+guacai_sources  += compat/winpr-stream.c
 guacsvc_sources += compat/winpr-stream.c
 guacsnd_sources += compat/winpr-stream.c
 guacdr_sources  += compat/winpr-stream.c
@@ -148,6 +155,25 @@ guacdr_libadd =     \
     @COMMON_LTLIB@  \
     @LIBGUAC_LTLIB@
 
+#
+# Audio Input
+#
+
+guacai_cflags               =  \
+    -Werror -Wall -Iinclude    \
+    @COMMON_INCLUDE@           \
+    @COMMON_SSH_INCLUDE@       \
+    @LIBGUAC_INCLUDE@
+
+guacai_ldflags =                   \
+    -module -avoid-version -shared \
+    @PTHREAD_LIBS@                 \
+    @RDP_LIBS@
+
+guacai_libadd =     \
+    @COMMON_LTLIB@  \
+    @LIBGUAC_LTLIB@
+
 #
 # RDPSND
 #
@@ -224,10 +250,16 @@ if LEGACY_FREERDP_EXTENSIONS
 
 # FreeRDP 1.0-style extensions
 freerdp_LTLIBRARIES = \
+    guacai.la         \
     guacdr.la         \
     guacsnd.la        \
     guacsvc.la
 
+guacai_la_SOURCES = ${guacai_sources}
+guacai_la_CFLAGS  = ${guacai_cflags}
+guacai_la_LDFLAGS = ${guacai_ldflags}
+guacai_la_LIBADD  = ${guacai_libadd}
+
 guacdr_la_SOURCES = ${guacdr_sources}
 guacdr_la_CFLAGS  = ${guacdr_cflags}
 guacdr_la_LDFLAGS = ${guacdr_ldflags}
@@ -247,10 +279,16 @@ else
 
 # FreeRDP 1.1 (and hopefully onward) extensions
 freerdp_LTLIBRARIES = \
+    guacai-client.la  \
     guacdr-client.la  \
     guacsnd-client.la \
     guacsvc-client.la
 
+guacai_client_la_SOURCES = ${guacai_sources}
+guacai_client_la_CFLAGS  = ${guacai_cflags}
+guacai_client_la_LDFLAGS = ${guacai_ldflags}
+guacai_client_la_LIBADD  = ${guacai_libadd}
+
 guacdr_client_la_SOURCES = ${guacdr_sources}
 guacdr_client_la_CFLAGS  = ${guacdr_cflags}
 guacdr_client_la_LDFLAGS = ${guacdr_ldflags}

src/protocols/rdp/audio_input.c

@@ -0,0 +1,74 @@
+/*
+ * 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 "audio_input.h"
+
+#include <freerdp/freerdp.h>
+#include <freerdp/channels/channels.h>
+#include <guacamole/protocol.h>
+#include <guacamole/socket.h>
+#include <guacamole/stream.h>
+#include <guacamole/user.h>
+
+#include <stdlib.h>
+
+int guac_rdp_audio_handler(guac_user* user, guac_stream* stream,
+        char* mimetype) {
+
+    /* FIXME: Assuming mimetype of "audio/L16;rate=44100,channels=2" */
+
+    /* Init stream data */
+    stream->blob_handler = guac_rdp_audio_blob_handler;
+    stream->end_handler = guac_rdp_audio_end_handler;
+
+    guac_protocol_send_ack(user->socket, stream,
+            "OK", GUAC_PROTOCOL_STATUS_SUCCESS);
+    guac_socket_flush(user->socket);
+
+    return 0;
+
+}
+
+int guac_rdp_audio_blob_handler(guac_user* user, guac_stream* stream,
+        void* data, int length) {
+
+    /* STUB */
+    return 0;
+
+}
+
+int guac_rdp_audio_end_handler(guac_user* user, guac_stream* stream) {
+
+    /* STUB */
+    return 0;
+
+}
+
+void guac_rdp_audio_load_plugin(rdpContext* context) {
+
+    /* Add "AUDIO_INPUT" channel */
+    ADDIN_ARGV* args = malloc(sizeof(ADDIN_ARGV));
+    args->argc = 1;
+    args->argv = malloc(sizeof(char**) * 1);
+    args->argv[0] = strdup("guacai");
+    freerdp_dynamic_channel_collection_add(context->settings, args);
+
+}
+

src/protocols/rdp/audio_input.h

@@ -0,0 +1,54 @@
+/*
+ * 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_AUDIO_INPUT_H
+#define GUAC_RDP_AUDIO_INPUT_H
+
+#include "config.h"
+
+#include <freerdp/freerdp.h>
+#include <guacamole/user.h>
+
+/**
+ * Handler for inbound audio data (audio input).
+ */
+guac_user_audio_handler guac_rdp_audio_handler;
+
+/**
+ * Handler for stream data related to audio input.
+ */
+guac_user_blob_handler guac_rdp_audio_blob_handler;
+
+/**
+ * Handler for end-of-stream related to audio input.
+ */
+guac_user_end_handler guac_rdp_audio_end_handler;
+
+/**
+ * Loads Guacamole's "guacai" plugin for FreeRDP, adding support for the
+ * "AUDIO_INPUT" dynamic virtual channel. This function must ONLY be called
+ * after FreeRDP's "drdynvc" virtual channel plugin has been loaded.
+ *
+ * @param context
+ *     The rdpContext associated with the active RDP session.
+ */
+void guac_rdp_audio_load_plugin(rdpContext* context);
+
+#endif
+

src/protocols/rdp/guac_ai/ai_service.c

@@ -0,0 +1,56 @@
+/*
+ * 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 "ai_service.h"
+#include "rdp.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <freerdp/freerdp.h>
+#include <freerdp/constants.h>
+#include <freerdp/dvc.h>
+#include <guacamole/client.h>
+
+#ifdef ENABLE_WINPR
+#include <winpr/stream.h>
+#else
+#include "compat/winpr-stream.h"
+#endif
+
+/**
+ * Entry point for AUDIO_INPUT dynamic virtual channel.
+ */
+int DVCPluginEntry(IDRDYNVC_ENTRY_POINTS* pEntryPoints) {
+
+    rdpSettings* settings = pEntryPoints->GetRdpSettings(pEntryPoints);
+    freerdp* instance = settings->instance;
+    rdpContext* context = instance->context;
+    guac_client* client = ((rdp_freerdp_context*) context)->client;
+
+    /* STUB */
+    guac_client_log(client, GUAC_LOG_DEBUG,
+            "STUB: AUDIO_INPUT DVC (entry point)");
+
+    return 1;
+
+}
+

src/protocols/rdp/guac_ai/ai_service.h

@@ -0,0 +1,29 @@
+/*
+ * 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_AI_SERVICE_H
+#define GUAC_RDP_AI_SERVICE_H
+
+#include "config.h"
+
+/* STUB */
+
+#endif
+

src/protocols/rdp/rdp.c

@@ -19,6 +19,7 @@
 
 #include "config.h"
 
+#include "audio_input.h"
 #include "client.h"
 #include "guac_cursor.h"
 #include "guac_display.h"
@@ -223,24 +224,33 @@ BOOL rdp_freerdp_pre_connect(freerdp* instance) {
             (pChannelConnectedEventHandler) guac_rdp_channel_connected);
 #endif
 
-#ifdef HAVE_FREERDP_DISPLAY_UPDATE_SUPPORT
-    /* Load required plugins if display update is enabled */
-    if (settings->resize_method == GUAC_RESIZE_DISPLAY_UPDATE) {
+    /* Load DRDYNVC plugin if required */
+    if (settings->resize_method == GUAC_RESIZE_DISPLAY_UPDATE
+            || settings->enable_audio_input) {
 
-        /* Load virtual channel management plugin (needed by display update) */
+        /* Load virtual channel management plugin */
         if (freerdp_channels_load_plugin(channels, instance->settings,
                     "drdynvc", instance->settings))
             guac_client_log(client, GUAC_LOG_WARNING,
-                    "Failed to load drdynvc plugin. Display update support "
-                    "will be disabled.");
+                    "Failed to load drdynvc plugin. Display update and audio "
+                    "input support will be disabled.");
 
         /* Init display update plugin if "drdynvc" was loaded successfully */
-        else
-            guac_rdp_disp_load_plugin(instance->context);
-
-    }
+        else {
+#ifdef HAVE_FREERDP_DISPLAY_UPDATE_SUPPORT
+            /* Load "disp" plugin for display update */
+            if (settings->resize_method == GUAC_RESIZE_DISPLAY_UPDATE)
+                guac_rdp_disp_load_plugin(instance->context);
 #endif
 
+            /* Load "AUDIO_INPUT" plugin for audio input*/
+            if (settings->enable_audio_input)
+                guac_rdp_audio_load_plugin(instance->context);
+
+        }
+
+    } /* end if drdynvc required */
+
     /* Load clipboard plugin */
     if (freerdp_channels_load_plugin(channels, instance->settings,
                 "cliprdr", NULL))

src/protocols/rdp/rdp_settings.c

@@ -90,6 +90,7 @@ const char* GUAC_RDP_CLIENT_ARGS[] = {
     "recording-name",
     "create-recording-path",
     "resize-method",
+    "enable-audio-input",
 
     NULL
 };
@@ -378,6 +379,12 @@ enum RDP_ARGS_IDX {
      */
     IDX_RESIZE_METHOD,
 
+    /**
+     * "true" if audio input (microphone) should be enabled for the RDP
+     * connection, "false" or blank otherwise.
+     */
+    IDX_ENABLE_AUDIO_INPUT,
+
     RDP_ARGS_COUNT
 };
 
@@ -739,6 +746,11 @@ guac_rdp_settings* guac_rdp_parse_args(guac_user* user,
         settings->resize_method = GUAC_RESIZE_NONE;
     }
 
+    /* Audio input enable/disable */
+    settings->enable_audio_input =
+        guac_user_parse_args_boolean(user, GUAC_RDP_CLIENT_ARGS, argv,
+                IDX_ENABLE_AUDIO_INPUT, 0);
+
     /* Success */
     return settings;
 

src/protocols/rdp/rdp_settings.h

@@ -378,6 +378,11 @@ typedef struct guac_rdp_settings {
      */
     guac_rdp_resize_method resize_method;
 
+    /**
+     * Whether audio input (microphone) is enabled.
+     */
+    int enable_audio_input;
+
 } guac_rdp_settings;
 
 /**

src/protocols/rdp/user.c

@@ -19,6 +19,7 @@
 
 #include "config.h"
 
+#include "audio_input.h"
 #include "input.h"
 #include "guac_display.h"
 #include "user.h"
@@ -65,6 +66,10 @@ int guac_rdp_user_join_handler(guac_user* user, int argc, char** argv) {
             return 1;
         }
 
+        /* Handle inbound audio streams if audio input is enabled */
+        if (settings->enable_audio_input)
+            user->audio_handler = guac_rdp_audio_handler;
+
     }
 
     /* If not owner, synchronize with current state */