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/* Packet-rdp_snd.c
* Routines for the audio output RDP channel
* Copyright 2023, David Fort <contact@hardening-consulting.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* See: "[MS-RDPEA] "
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/conversation.h>
#include <epan/expert.h>
#include <epan/value_string.h>
#include "packet-rdpudp.h"
#define PNAME "RDP audio output virtual channel Protocol"
#define PSNAME "rdpsnd"
#define PFNAME "rdp_snd"
void proto_register_rdp_snd(void);
void proto_reg_handoff_rdp_snd(void);
static int proto_rdp_snd = -1;
static int hf_snd_msgType = -1;
static int hf_snd_bPad = -1;
static int hf_snd_bodySize = -1;
static int ett_rdp_snd = -1;
enum {
SNDC_CLOSE = 0x01,
SNDC_WAVE = 0x02,
SNDC_SETVOLUME = 0x03,
SNDC_SETPITCH = 0x04,
SNDC_WAVECONFIRM = 0x05,
SNDC_TRAINING = 0x06,
SNDC_FORMATS = 0x07,
SNDC_CRYPTKEY = 0x08,
SNDC_WAVEENCRYPT = 0x09,
SNDC_UDPWAVE = 0x0A,
SNDC_UDPWAVELAST = 0x0B,
SNDC_QUALITYMODE = 0x0C,
SNDC_WAVE2 = 0x0D,
};
static const value_string rdp_snd_order_vals[] = {
{ SNDC_CLOSE, "Close"},
{ SNDC_WAVE, "Wave"},
{ SNDC_SETVOLUME, "Set volume"},
{ SNDC_SETPITCH, "Set pitch"},
{ SNDC_WAVECONFIRM, "Wave confirm"},
{ SNDC_TRAINING, "Training"},
{ SNDC_FORMATS, "Formats"},
{ SNDC_CRYPTKEY, "Crypt key"},
{ SNDC_WAVEENCRYPT, "Wave encrypt"},
{ SNDC_UDPWAVE, "Udp wave"},
{ SNDC_UDPWAVELAST, "Udp wave last"},
{ SNDC_QUALITYMODE, "Quality mode"},
{ SNDC_WAVE2, "Wave 2"},
{ 0x0, NULL},
};
static int
dissect_rdp_snd(tvbuff_t *tvb _U_, packet_info *pinfo, proto_tree *parent_tree _U_, void *data _U_)
{
proto_item *item;
gint nextOffset, offset = 0;
guint32 cmdId = 0;
guint32 pduLength;
proto_tree *tree;
parent_tree = proto_tree_get_root(parent_tree);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RDPSND");
col_clear(pinfo->cinfo, COL_INFO);
pduLength = tvb_get_guint32(tvb, offset + 2, ENC_LITTLE_ENDIAN) + 4;
nextOffset = offset + pduLength;
item = proto_tree_add_item(parent_tree, proto_rdp_snd, tvb, offset, pduLength, ENC_NA);
tree = proto_item_add_subtree(item, ett_rdp_snd);
proto_tree_add_item_ret_uint(tree, hf_snd_msgType, tvb, offset, 1, ENC_LITTLE_ENDIAN, &cmdId);
offset += 1;
proto_tree_add_item(tree, hf_snd_bPad, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tree, hf_snd_bodySize, tvb, offset, 2, ENC_LITTLE_ENDIAN);
//offset += 2;
col_add_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str_const(cmdId, rdp_snd_order_vals, "Unknown rdpsnd command"));
switch (cmdId) {
case SNDC_CLOSE:
case SNDC_WAVE:
case SNDC_SETVOLUME:
case SNDC_SETPITCH:
case SNDC_WAVECONFIRM:
case SNDC_TRAINING:
case SNDC_FORMATS:
case SNDC_CRYPTKEY:
case SNDC_WAVEENCRYPT:
case SNDC_UDPWAVE:
case SNDC_UDPWAVELAST:
case SNDC_QUALITYMODE:
case SNDC_WAVE2:
default:
break;
}
offset = nextOffset;
return offset;
}
void proto_register_rdp_snd(void) {
static hf_register_info hf[] = {
{ &hf_snd_msgType,
{ "MsgrType", "rdp_snd.msgtype",
FT_UINT8, BASE_HEX, VALS(rdp_snd_order_vals), 0x0,
NULL, HFILL }
},
{ &hf_snd_bPad,
{ "bPad", "rdp_snd.bpad",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_snd_bodySize,
{ "BodySize", "rdp_snd.bodysize",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
};
static gint *ett[] = {
&ett_rdp_snd,
};
proto_rdp_snd = proto_register_protocol(PNAME, PSNAME, PFNAME);
/* Register fields and subtrees */
proto_register_field_array(proto_rdp_snd, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("rdp_snd", dissect_rdp_snd, proto_rdp_snd);
}
void proto_reg_handoff_rdp_snd(void) {
}
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