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GUACAMOLE-249: Remove "guacsnd" plugin in favor of leveraging common SVC implementation.

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This commit is contained in:
Michael Jumper 2019-12-22 14:01:43 -08:00
parent 3255b182ab
commit 4612e79b8d
7 changed files with 211 additions and 613 deletions
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31
src/protocols/rdp/Makefile.am
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@ -63,6 +63,7 @@ libguac_client_rdp_la_SOURCES = \
rdp_stream.c \
rdpdr.c \
rdpsnd.c \
rdpsnd_messages.c \
resolution.c \
unicode.c \
user.c
@ -78,8 +79,6 @@ noinst_HEADERS = \
guac_rdpdr/rdpdr_messages.h \
guac_rdpdr/rdpdr_printer.h \
guac_rdpdr/rdpdr_service.h \
guac_rdpsnd/rdpsnd_messages.h \
guac_rdpsnd/rdpsnd_service.h \
audio_input.h \
client.h \
clipboard.h \
@ -107,6 +106,7 @@ noinst_HEADERS = \
rdp_stream.h \
rdpdr.h \
rdpsnd.h \
rdpsnd_messages.h \
resolution.h \
unicode.h \
user.h
@ -135,8 +135,7 @@ libguac_client_rdp_la_LIBADD = \
freerdp_LTLIBRARIES = \
libguac-common-svc-client.la \
libguacai-client.la \
libguacdr-client.la \
libguacsnd-client.la
libguacdr-client.la
freerdpdir = ${libdir}/freerdp2
@ -219,30 +218,6 @@ libguacai_client_la_LIBADD = \
@COMMON_LTLIB@ \
@LIBGUAC_LTLIB@
#
# RDPSND
#
libguacsnd_client_la_SOURCES = \
guac_rdpsnd/rdpsnd_messages.c \
guac_rdpsnd/rdpsnd_service.c
libguacsnd_client_la_CFLAGS = \
-Werror -Wall -Iinclude \
@COMMON_INCLUDE@ \
@COMMON_SSH_INCLUDE@ \
@LIBGUAC_INCLUDE@ \
@RDP_CFLAGS@
libguacsnd_client_la_LDFLAGS = \
-module -avoid-version -shared \
@PTHREAD_LIBS@ \
@RDP_LIBS@
libguacsnd_client_la_LIBADD = \
@COMMON_LTLIB@ \
@LIBGUAC_LTLIB@
#
# Optional SFTP support
#

364
src/protocols/rdp/guac_rdpsnd/rdpsnd_service.c
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@ -1,364 +0,0 @@
/*
* 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 "rdpsnd_service.h"
#include "rdpsnd_messages.h"
#include <stdlib.h>
#include <string.h>
#include <freerdp/constants.h>
#include <guacamole/client.h>
#include <winpr/stream.h>
/**
* Processes data received along the RDPSND channel via a
* CHANNEL_EVENT_DATA_RECEIVED event, forwarding the data along an established,
* outbound pipe stream to the Guacamole client.
*
* @param rdpsnd
* The guac_rdpsnd structure representing the RDPSND channel.
*
* @param input_stream
* The data that was received.
*/
static void guac_rdpsnd_process_receive(guac_rdpsnd* rdpsnd,
wStream* input_stream) {
guac_rdpsnd_pdu_header header;
/* Read RDPSND PDU header */
Stream_Read_UINT8(input_stream, header.message_type);
Stream_Seek_UINT8(input_stream);
Stream_Read_UINT16(input_stream, header.body_size);
/*
* If next PDU is SNDWAVE (due to receiving WaveInfo PDU previously),
* ignore the header and parse as a Wave PDU.
*/
if (rdpsnd->next_pdu_is_wave) {
guac_rdpsnd_wave_handler(rdpsnd, input_stream, &header);
return;
}
/* Dispatch message to standard handlers */
switch (header.message_type) {
/* Server Audio Formats and Version PDU */
case SNDC_FORMATS:
guac_rdpsnd_formats_handler(rdpsnd, input_stream, &header);
break;
/* Training PDU */
case SNDC_TRAINING:
guac_rdpsnd_training_handler(rdpsnd, input_stream, &header);
break;
/* WaveInfo PDU */
case SNDC_WAVE:
guac_rdpsnd_wave_info_handler(rdpsnd, input_stream, &header);
break;
/* Close PDU */
case SNDC_CLOSE:
guac_rdpsnd_close_handler(rdpsnd, input_stream, &header);
break;
}
}
/**
* Event handler for events which deal with data transmitted over the RDPSND
* channel. This specific implementation of the event handler currently
* handles only the CHANNEL_EVENT_DATA_RECEIVED event, delegating actual
* handling of that event to guac_rdpsnd_process_receive().
*
* The FreeRDP requirements for this function follow those of the
* VirtualChannelOpenEventEx callback defined within Microsoft's RDP API:
*
* https://docs.microsoft.com/en-us/previous-versions/windows/embedded/aa514754%28v%3dmsdn.10%29
*
* @param user_param
* The pointer to arbitrary data originally passed via the first parameter
* of the pVirtualChannelInitEx() function call when the associated channel
* was initialized. The pVirtualChannelInitEx() function is exposed within
* the channel entry points structure.
*
* @param open_handle
* The handle which identifies the channel itself, typically referred to
* within the FreeRDP source as OpenHandle.
*
* @param event
* An integer representing the event that should be handled. This will be
* either CHANNEL_EVENT_DATA_RECEIVED, CHANNEL_EVENT_WRITE_CANCELLED, or
* CHANNEL_EVENT_WRITE_COMPLETE.
*
* @param data
* The data received, for CHANNEL_EVENT_DATA_RECEIVED events, and the value
* passed as user data to pVirtualChannelWriteEx() for
* CHANNEL_EVENT_WRITE_* events (note that user data for
* pVirtualChannelWriteEx() as implemented by FreeRDP MUST either be NULL
* or a wStream containing the data written).
*
* @param data_length
* The number of bytes of event-specific data.
*
* @param total_length
* The total number of bytes written to the RDP server in a single write
* operation.
*
* NOTE: The meaning of total_length is unclear. The above description was
* written mainly through referencing the documentation in MSDN. Real-world
* use will need to be consulted, likely within the FreeRDP source, before
* this value can be reliably used. The current implementation of this
* handler ignores this parameter.
*
* @param data_flags
* The result of a bitwise OR of the CHANNEL_FLAG_* flags which apply to
* the data received. This value is relevant only to
* CHANNEL_EVENT_DATA_RECEIVED events. Valid flags are CHANNEL_FLAG_FIRST,
* CHANNEL_FLAG_LAST, and CHANNEL_FLAG_ONLY. The flag CHANNEL_FLAG_MIDDLE
* is not itself a flag, but the absence of both CHANNEL_FLAG_FIRST and
* CHANNEL_FLAG_LAST.
*/
static VOID guac_rdpsnd_handle_open_event(LPVOID user_param,
DWORD open_handle, UINT event, LPVOID data, UINT32 data_length,
UINT32 total_length, UINT32 data_flags) {
/* Ignore all events except for received data */
if (event != CHANNEL_EVENT_DATA_RECEIVED)
return;
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) user_param;
/* Validate relevant handle matches that of the RDPSND channel */
if (open_handle != rdpsnd->open_handle) {
guac_client_log(rdpsnd->client, GUAC_LOG_WARNING, "%i bytes of data "
"received from within the remote desktop session for the "
"RDPSND channel are being dropped because the relevant open "
"handle (0x%X) does not match the open handle of RDPSND "
"(0x%X).", data_length, rdpsnd->channel_def.name, open_handle,
rdpsnd->open_handle);
return;
}
/* If receiving first chunk, allocate sufficient space for all remaining
* chunks */
if (data_flags & CHANNEL_FLAG_FIRST) {
/* Limit maximum received size */
if (total_length > GUAC_SVC_MAX_ASSEMBLED_LENGTH) {
guac_client_log(rdpsnd->client, GUAC_LOG_WARNING, "RDP server has "
"requested to send a sequence of %i bytes, but this "
"exceeds the maximum buffer space of %i bytes. Received "
"data may be truncated.", total_length,
GUAC_SVC_MAX_ASSEMBLED_LENGTH);
total_length = GUAC_SVC_MAX_ASSEMBLED_LENGTH;
}
rdpsnd->input_stream = Stream_New(NULL, total_length);
}
/* Add chunk to buffer only if sufficient space remains */
if (Stream_EnsureRemainingCapacity(rdpsnd->input_stream, data_length))
Stream_Write(rdpsnd->input_stream, data, data_length);
else
guac_client_log(rdpsnd->client, GUAC_LOG_WARNING, "%i bytes of data "
"received from within the remote desktop session for the "
"RDPSND channel are being dropped because the maximum "
"available space for received data has been exceeded.",
data_length, rdpsnd->channel_def.name, open_handle,
rdpsnd->open_handle);
/* Fire event once last chunk has been received */
if (data_flags & CHANNEL_FLAG_LAST) {
Stream_SealLength(rdpsnd->input_stream);
Stream_SetPosition(rdpsnd->input_stream, 0);
guac_rdpsnd_process_receive(rdpsnd, rdpsnd->input_stream);
Stream_Free(rdpsnd->input_stream, TRUE);
}
}
/**
* Processes a CHANNEL_EVENT_CONNECTED event, completing the
* connection/initialization process of the RDPSND channel.
*
* @param rdpsnd
* The guac_rdpsnd structure representing the RDPSND channel.
*/
static void guac_rdpsnd_process_connect(guac_rdpsnd* rdpsnd) {
/* Open FreeRDP side of connected channel */
UINT32 open_status =
rdpsnd->entry_points.pVirtualChannelOpenEx(rdpsnd->init_handle,
&rdpsnd->open_handle, rdpsnd->channel_def.name,
guac_rdpsnd_handle_open_event);
/* Warn if the channel cannot be opened after all */
if (open_status != CHANNEL_RC_OK) {
guac_client_log(rdpsnd->client, GUAC_LOG_WARNING, "RDPSND channel "
"could not be opened: %s (error %i)",
WTSErrorToString(open_status), open_status);
return;
}
/* Log that sound has been loaded */
guac_client_log(rdpsnd->client, GUAC_LOG_INFO, "RDPSND channel "
"connected.");
}
/**
* Processes a CHANNEL_EVENT_TERMINATED event, freeing all resources associated
* with the RDPSND channel.
*
* @param rdpsnd
* The guac_rdpsnd structure representing the RDPSND channel.
*/
static void guac_rdpsnd_process_terminate(guac_rdpsnd* rdpsnd) {
guac_client_log(rdpsnd->client, GUAC_LOG_INFO, "RDPSND channel disconnected.");
free(rdpsnd);
}
/**
* Event handler for events which deal with the overall lifecycle of the RDPSND
* channel. This specific implementation of the event handler currently
* handles only CHANNEL_EVENT_CONNECTED and CHANNEL_EVENT_TERMINATED events,
* delegating actual handling of those events to guac_rdpsnd_process_connect()
* and guac_rdpsnd_process_terminate() respectively.
*
* The FreeRDP requirements for this function follow those of the
* VirtualChannelInitEventEx callback defined within Microsoft's RDP API:
*
* https://docs.microsoft.com/en-us/previous-versions/windows/embedded/aa514727%28v%3dmsdn.10%29
*
* @param user_param
* The pointer to arbitrary data originally passed via the first parameter
* of the pVirtualChannelInitEx() function call when the associated channel
* was initialized. The pVirtualChannelInitEx() function is exposed within
* the channel entry points structure.
*
* @param init_handle
* The handle which identifies the client connection, typically referred to
* within the FreeRDP source as pInitHandle.
*
* @param event
* An integer representing the event that should be handled. This will be
* either CHANNEL_EVENT_CONNECTED, CHANNEL_EVENT_DISCONNECTED,
* CHANNEL_EVENT_INITIALIZED, CHANNEL_EVENT_TERMINATED, or
* CHANNEL_EVENT_V1_CONNECTED.
*
* @param data
* NULL in all cases except the CHANNEL_EVENT_CONNECTED event, in which
* case this is a null-terminated string containing the name of the server.
*
* @param data_length
* The number of bytes of data, if any.
*/
static VOID guac_rdpsnd_handle_init_event(LPVOID user_param,
LPVOID init_handle, UINT event, LPVOID data, UINT data_length) {
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) user_param;
/* Validate relevant handle matches that of the RDPSND channel */
if (init_handle != rdpsnd->init_handle) {
guac_client_log(rdpsnd->client, GUAC_LOG_WARNING, "An init event "
"(#%i) for the RDPSND channel has been dropped because the "
"relevant init handle (0x%X) does not match the init handle "
"of the RDPSND channel (0x%X).", event, init_handle,
rdpsnd->init_handle);
return;
}
switch (event) {
/* The RDPSND channel has been connected */
case CHANNEL_EVENT_CONNECTED:
guac_rdpsnd_process_connect(rdpsnd);
break;
/* The RDPSND channel has disconnected and now must be cleaned up */
case CHANNEL_EVENT_TERMINATED:
guac_rdpsnd_process_terminate(rdpsnd);
break;
}
}
/**
* Entry point for FreeRDP plugins. This function is automatically invoked when
* the plugin is loaded.
*
* @param entry_points
* Functions and data specific to the FreeRDP side of the virtual channel
* and plugin. This structure must be copied within implementation-specific
* storage such that the functions it references can be invoked when
* needed.
*
* @param init_handle
* The handle which identifies the client connection, typically referred to
* within the FreeRDP source as pInitHandle. This handle is also provided
* to the channel init event handler. The handle must eventually be used
* within the channel open event handler to obtain a handle to the channel
* itself.
*
* @return
* TRUE if the plugin has initialized successfully, FALSE otherwise.
*/
BOOL VirtualChannelEntryEx(PCHANNEL_ENTRY_POINTS entry_points,
PVOID init_handle) {
CHANNEL_ENTRY_POINTS_FREERDP_EX* entry_points_ex =
(CHANNEL_ENTRY_POINTS_FREERDP_EX*) entry_points;
/* Allocate plugin */
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) calloc(1, sizeof(guac_rdpsnd));
/* Init channel def */
strcpy(rdpsnd->channel_def.name, "rdpsnd");
rdpsnd->channel_def.options = CHANNEL_OPTION_INITIALIZED
| CHANNEL_OPTION_ENCRYPT_RDP;
/* Maintain reference to associated guac_client */
rdpsnd->client = (guac_client*) entry_points_ex->pExtendedData;
/* Copy FreeRDP data into RDPSND structure for future reference */
rdpsnd->entry_points = *entry_points_ex;
rdpsnd->init_handle = init_handle;
/* Complete initialization */
if (rdpsnd->entry_points.pVirtualChannelInitEx(rdpsnd, rdpsnd, init_handle,
&rdpsnd->channel_def, 1, VIRTUAL_CHANNEL_VERSION_WIN2000,
guac_rdpsnd_handle_init_event) != CHANNEL_RC_OK) {
return FALSE;
}
return TRUE;
}

165
src/protocols/rdp/guac_rdpsnd/rdpsnd_service.h
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@ -1,165 +0,0 @@
/*
* 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_RDPSND_SERVICE_H
#define GUAC_RDPSND_SERVICE_H
#include "config.h"
#include <freerdp/svc.h>
#include <guacamole/client.h>
#include <winpr/stream.h>
#include <winpr/wtsapi.h>
/**
* The maximum number of PCM formats to accept during the initial RDPSND
* handshake with the RDP server.
*/
#define GUAC_RDP_MAX_FORMATS 16
/**
* The maximum number of bytes that the RDP server will be allowed to send
* within any single write operation, regardless of the number of chunks that
* write is split into. Bytes beyond this limit may be dropped.
*/
#define GUAC_SVC_MAX_ASSEMBLED_LENGTH 1048576
/**
* Abstract representation of a PCM format, including the sample rate, number
* of channels, and bits per sample.
*/
typedef struct guac_pcm_format {
/**
* The sample rate of this PCM format.
*/
int rate;
/**
* The number off channels used by this PCM format. This will typically
* be 1 or 2.
*/
int channels;
/**
* The number of bits per sample within this PCM format. This should be
* either 8 or 16.
*/
int bps;
} guac_pcm_format;
/**
* Structure representing the current state of the Guacamole RDPSND plugin for
* FreeRDP.
*/
typedef struct guac_rdpsnd {
/**
* The Guacamole client associated with the guac_audio_stream that this
* plugin should use to stream received audio packets.
*/
guac_client* client;
/**
* The definition of this virtual channel (RDPSND).
*/
CHANNEL_DEF channel_def;
/**
* Functions and data specific to the FreeRDP side of the virtual channel
* and plugin.
*/
CHANNEL_ENTRY_POINTS_FREERDP_EX entry_points;
/**
* Handle which identifies the client connection, typically referred to
* within the FreeRDP source as pInitHandle. This handle is provided to the
* channel entry point and the channel init event handler. The handle must
* eventually be used within the channel open event handler to obtain a
* handle to the channel itself.
*/
PVOID init_handle;
/**
* Handle which identifies the channel itself, typically referred to within
* the FreeRDP source as OpenHandle. This handle is obtained through a call
* to entry_points.pVirtualChannelOpenEx() in response to receiving a
* CHANNEL_EVENT_CONNECTED event via the init event handler.
*
* Data is received in CHANNEL_EVENT_DATA_RECEIVED events via the open
* event handler, and data is written through calls to
* entry_points.pVirtualChannelWriteEx().
*/
DWORD open_handle;
/**
* All data that has been received thus far from the current RDP server
* write operation. Data received along virtual channels is sent in chunks
* (typically 1600 bytes), and thus must be gradually reassembled as it is
* received.
*/
wStream* input_stream;
/**
* The block number of the last SNDC_WAVE (WaveInfo) PDU received.
*/
int waveinfo_block_number;
/**
* Whether the next PDU coming is a SNDWAVE (Wave) PDU. Wave PDUs do not
* have headers, and are indicated by the receipt of a WaveInfo PDU.
*/
int next_pdu_is_wave;
/**
* The wave data received within the last SNDC_WAVE (WaveInfo) PDU.
*/
unsigned char initial_wave_data[4];
/**
* The size, in bytes, of the wave data in the coming Wave PDU, if any.
* This does not include the initial wave data received within the last
* SNDC_WAVE (WaveInfo) PDU, which is always the first four bytes of the
* actual wave data block.
*/
int incoming_wave_size;
/**
* The last received server timestamp.
*/
int server_timestamp;
/**
* All formats agreed upon by server and client during the initial format
* exchange. All of these formats will be PCM, which is the only format
* guaranteed to be supported (based on the official RDP documentation).
*/
guac_pcm_format formats[GUAC_RDP_MAX_FORMATS];
/**
* The total number of formats.
*/
int format_count;
} guac_rdpsnd;
#endif

77
src/protocols/rdp/rdpsnd.c
View File

@ -18,26 +18,89 @@
*/
#include "config.h"
#include "channels.h"
#include "common-svc.h"
#include "rdp.h"
#include "rdpsnd.h"
#include "rdpsnd_messages.h"
#include <freerdp/freerdp.h>
#include <guacamole/client.h>
#include <guacamole/client.h>
#include <winpr/stream.h>
#include <stdlib.h>
void guac_rdpsnd_process_receive(guac_rdp_common_svc* svc,
wStream* input_stream) {
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
guac_rdpsnd_pdu_header header;
/* Read RDPSND PDU header */
Stream_Read_UINT8(input_stream, header.message_type);
Stream_Seek_UINT8(input_stream);
Stream_Read_UINT16(input_stream, header.body_size);
/*
* If next PDU is SNDWAVE (due to receiving WaveInfo PDU previously),
* ignore the header and parse as a Wave PDU.
*/
if (rdpsnd->next_pdu_is_wave) {
guac_rdpsnd_wave_handler(svc, input_stream, &header);
return;
}
/* Dispatch message to standard handlers */
switch (header.message_type) {
/* Server Audio Formats and Version PDU */
case SNDC_FORMATS:
guac_rdpsnd_formats_handler(svc, input_stream, &header);
break;
/* Training PDU */
case SNDC_TRAINING:
guac_rdpsnd_training_handler(svc, input_stream, &header);
break;
/* WaveInfo PDU */
case SNDC_WAVE:
guac_rdpsnd_wave_info_handler(svc, input_stream, &header);
break;
/* Close PDU */
case SNDC_CLOSE:
guac_rdpsnd_close_handler(svc, input_stream, &header);
break;
}
}
void guac_rdpsnd_process_connect(guac_rdp_common_svc* svc) {
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) calloc(1, sizeof(guac_rdpsnd));
svc->data = rdpsnd;
}
void guac_rdpsnd_process_terminate(guac_rdp_common_svc* svc) {
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
free(rdpsnd);
}
void guac_rdpsnd_load_plugin(rdpContext* context) {
guac_client* client = ((rdp_freerdp_context*) context)->client;
/* Load RDPSND plugin */
if (guac_freerdp_channels_load_plugin(context->channels, context->settings, "guacsnd", client)) {
/* Load support for RDPSND */
if (guac_rdp_common_svc_load_plugin(context, "rdpsnd", 0,
guac_rdpsnd_process_connect, guac_rdpsnd_process_receive,
guac_rdpsnd_process_terminate)) {
guac_client_log(client, GUAC_LOG_WARNING, "Support for the RDPSND "
"channel (audio output) could not be loaded. Sound will not "
"work. Drive redirection and printing MAY not work.");
return;
}
guac_client_log(client, GUAC_LOG_DEBUG, "Support for RDPSND (audio "
"output) registered. Awaiting channel connection.");
}

101
src/protocols/rdp/rdpsnd.h
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@ -21,6 +21,89 @@
#define GUAC_RDP_RDPSND_H
#include "config.h"
#include "common-svc.h"
#include <guacamole/client.h>
/**
* The maximum number of PCM formats to accept during the initial RDPSND
* handshake with the RDP server.
*/
#define GUAC_RDP_MAX_FORMATS 16
/**
* Abstract representation of a PCM format, including the sample rate, number
* of channels, and bits per sample.
*/
typedef struct guac_rdpsnd_pcm_format {
/**
* The sample rate of this PCM format.
*/
int rate;
/**
* The number off channels used by this PCM format. This will typically
* be 1 or 2.
*/
int channels;
/**
* The number of bits per sample within this PCM format. This should be
* either 8 or 16.
*/
int bps;
} guac_rdpsnd_pcm_format;
/**
* Structure representing the current state of the Guacamole RDPSND plugin for
* FreeRDP.
*/
typedef struct guac_rdpsnd {
/**
* The block number of the last SNDC_WAVE (WaveInfo) PDU received.
*/
int waveinfo_block_number;
/**
* Whether the next PDU coming is a SNDWAVE (Wave) PDU. Wave PDUs do not
* have headers, and are indicated by the receipt of a WaveInfo PDU.
*/
int next_pdu_is_wave;
/**
* The wave data received within the last SNDC_WAVE (WaveInfo) PDU.
*/
unsigned char initial_wave_data[4];
/**
* The size, in bytes, of the wave data in the coming Wave PDU, if any.
* This does not include the initial wave data received within the last
* SNDC_WAVE (WaveInfo) PDU, which is always the first four bytes of the
* actual wave data block.
*/
int incoming_wave_size;
/**
* The last received server timestamp.
*/
int server_timestamp;
/**
* All formats agreed upon by server and client during the initial format
* exchange. All of these formats will be PCM, which is the only format
* guaranteed to be supported (based on the official RDP documentation).
*/
guac_rdpsnd_pcm_format formats[GUAC_RDP_MAX_FORMATS];
/**
* The total number of formats.
*/
int format_count;
} guac_rdpsnd;
/**
* Initializes audio output support for RDP and handling of the RDPSND channel.
@ -35,5 +118,23 @@
*/
void guac_rdpsnd_load_plugin(rdpContext* context);
/**
* Handler which is invoked when the RDPSND channel is connected to the RDP
* server.
*/
guac_rdp_common_svc_connect_handler guac_rdpsnd_process_connect;
/**
* Handler which is invoked when the RDPSND channel has received data from the
* RDP server.
*/
guac_rdp_common_svc_receive_handler guac_rdpsnd_process_receive;
/**
* Handler which is invoked when the RDPSND channel has disconnected and is
* about to be freed.
*/
guac_rdp_common_svc_terminate_handler guac_rdpsnd_process_terminate;
#endif

53
src/protocols/rdp/guac_rdpsnd/rdpsnd_messages.c → src/protocols/rdp/rdpsnd_messages.c
View File

@ -20,8 +20,8 @@
#include "config.h"
#include "rdp.h"
#include "rdpsnd.h"
#include "rdpsnd_messages.h"
#include "rdpsnd_service.h"
#include <pthread.h>
#include <stdlib.h>
@ -31,9 +31,7 @@
#include <winpr/stream.h>
#include <winpr/wtypes.h>
/* MESSAGE HANDLERS */
void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_formats_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header) {
int server_format_count;
@ -44,11 +42,10 @@ void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
int output_body_size;
unsigned char* output_stream_end;
/* Get associated client data */
guac_client* client = rdpsnd->client;
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_client* client = svc->client;
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
/* Get audio stream from client data */
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_audio_stream* audio = rdp_client->audio;
/* Reset own format count */
@ -181,9 +178,7 @@ void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
Stream_SetPointer(output_stream, output_stream_end);
/* Send accepted formats */
rdpsnd->entry_points.pVirtualChannelWriteEx(rdpsnd->init_handle,
rdpsnd->open_handle, Stream_Buffer(output_stream),
Stream_GetPosition(output_stream), output_stream);
guac_rdp_common_svc_write(svc, output_stream);
/* If version greater than 6, must send Quality Mode PDU */
if (server_version >= 6) {
@ -196,21 +191,21 @@ void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
Stream_Write_UINT16(output_stream, HIGH_QUALITY);
Stream_Write_UINT16(output_stream, 0);
rdpsnd->entry_points.pVirtualChannelWriteEx(rdpsnd->init_handle,
rdpsnd->open_handle, Stream_Buffer(output_stream),
Stream_GetPosition(output_stream), output_stream);
guac_rdp_common_svc_write(svc, output_stream);
}
}
/* server is getting a feel of the round trip time */
void guac_rdpsnd_training_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_training_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header) {
int data_size;
wStream* output_stream;
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
/* Read timestamp and data size */
Stream_Read_UINT16(input_stream, rdpsnd->server_timestamp);
Stream_Read_UINT16(input_stream, data_size);
@ -223,22 +218,19 @@ void guac_rdpsnd_training_handler(guac_rdpsnd* rdpsnd,
Stream_Write_UINT16(output_stream, rdpsnd->server_timestamp);
Stream_Write_UINT16(output_stream, data_size);
rdpsnd->entry_points.pVirtualChannelWriteEx(rdpsnd->init_handle,
rdpsnd->open_handle, Stream_Buffer(output_stream),
Stream_GetPosition(output_stream), output_stream);
guac_rdp_common_svc_write(svc, output_stream);
}
void guac_rdpsnd_wave_info_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_wave_info_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header) {
int format;
/* Get associated client data */
guac_client* client = rdpsnd->client;
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_client* client = svc->client;
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
/* Get audio stream from client data */
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_audio_stream* audio = rdp_client->audio;
/* Read wave information */
@ -267,14 +259,13 @@ void guac_rdpsnd_wave_info_handler(guac_rdpsnd* rdpsnd,
}
void guac_rdpsnd_wave_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_wave_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header) {
/* Get associated client data */
guac_client* client = rdpsnd->client;
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_client* client = svc->client;
guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data;
/* Get audio stream from client data */
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
guac_audio_stream* audio = rdp_client->audio;
/* Wave Confirmation PDU */
@ -302,16 +293,14 @@ void guac_rdpsnd_wave_handler(guac_rdpsnd* rdpsnd,
Stream_Write_UINT8(output_stream, 0);
/* Send Wave Confirmation PDU */
rdpsnd->entry_points.pVirtualChannelWriteEx(rdpsnd->init_handle,
rdpsnd->open_handle, Stream_Buffer(output_stream),
Stream_GetPosition(output_stream), output_stream);
guac_rdp_common_svc_write(svc, output_stream);
/* We no longer expect to receive wave data */
rdpsnd->next_pdu_is_wave = FALSE;
}
void guac_rdpsnd_close_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_close_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header) {
/* Do nothing */

33
src/protocols/rdp/guac_rdpsnd/rdpsnd_messages.h → src/protocols/rdp/rdpsnd_messages.h
View File

@ -22,8 +22,7 @@
#define GUAC_RDPSND_MESSAGES_H
#include "config.h"
#include "rdpsnd_service.h"
#include "common-svc.h"
#include <winpr/stream.h>
@ -117,8 +116,8 @@ typedef struct guac_rdpsnd_pdu_header {
* SNDC_FORMATS PDU describes all audio formats supported by the RDP server, as
* well as the version of RDPSND implemented.
*
* @param rdpsnd
* The Guacamole RDPSND plugin receiving the SNDC_FORMATS PDU.
* @param svc
* The RDPSND channel receiving the SNDC_FORMATS PDU.
*
* @param input_stream
* The FreeRDP input stream containing the remaining raw bytes (after the
@ -128,7 +127,7 @@ typedef struct guac_rdpsnd_pdu_header {
* The header content of the SNDC_FORMATS PDU. All RDPSND messages contain
* the same header information.
*/
void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_formats_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header);
/**
@ -138,8 +137,8 @@ void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
*
* https://msdn.microsoft.com/en-us/library/cc240961.aspx
*
* @param rdpsnd
* The Guacamole RDPSND plugin receiving the SNDC_TRAINING PDU.
* @param svc
* The RDPSND channel receiving the SNDC_TRAINING PDU.
*
* @param input_stream
* The FreeRDP input stream containing the remaining raw bytes (after the
@ -149,7 +148,7 @@ void guac_rdpsnd_formats_handler(guac_rdpsnd* rdpsnd,
* The header content of the SNDC_TRAINING PDU. All RDPSND messages contain
* the same header information.
*/
void guac_rdpsnd_training_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_training_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header);
/**
@ -161,8 +160,8 @@ void guac_rdpsnd_training_handler(guac_rdpsnd* rdpsnd,
*
* https://msdn.microsoft.com/en-us/library/cc240963.aspx
*
* @param rdpsnd
* The Guacamole RDPSND plugin receiving the SNDC_WAVE PDU.
* @param svc
* The RDPSND channel receiving the SNDC_WAVE PDU.
*
* @param input_stream
* The FreeRDP input stream containing the remaining raw bytes (after the
@ -172,7 +171,7 @@ void guac_rdpsnd_training_handler(guac_rdpsnd* rdpsnd,
* The header content of the SNDC_WAVE PDU. All RDPSND messages contain
* the same header information.
*/
void guac_rdpsnd_wave_info_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_wave_info_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header);
/**
@ -180,8 +179,8 @@ void guac_rdpsnd_wave_info_handler(guac_rdpsnd* rdpsnd,
* PDU contains the actual audio data, less the four bytes of audio data
* included in the SNDC_WAVE PDU.
*
* @param rdpsnd
* The Guacamole RDPSND plugin receiving the SNDWAV PDU.
* @param svc
* The RDPSND channel receiving the SNDWAV PDU.
*
* @param input_stream
* The FreeRDP input stream containing the remaining raw bytes (after the
@ -191,7 +190,7 @@ void guac_rdpsnd_wave_info_handler(guac_rdpsnd* rdpsnd,
* The header content of the SNDWAV PDU. All RDPSND messages contain
* the same header information.
*/
void guac_rdpsnd_wave_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_wave_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header);
/**
@ -200,8 +199,8 @@ void guac_rdpsnd_wave_handler(guac_rdpsnd* rdpsnd,
*
* https://msdn.microsoft.com/en-us/library/cc240970.aspx
*
* @param rdpsnd
* The Guacamole RDPSND plugin receiving the SNDC_CLOSE PDU.
* @param svc
* The RDPSND channel receiving the SNDC_CLOSE PDU.
*
* @param input_stream
* The FreeRDP input stream containing the remaining raw bytes (after the
@ -211,7 +210,7 @@ void guac_rdpsnd_wave_handler(guac_rdpsnd* rdpsnd,
* The header content of the SNDC_CLOSE PDU. All RDPSND messages contain
* the same header information.
*/
void guac_rdpsnd_close_handler(guac_rdpsnd* rdpsnd,
void guac_rdpsnd_close_handler(guac_rdp_common_svc* svc,
wStream* input_stream, guac_rdpsnd_pdu_header* header);
#endif