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/* packet-isi.c
* Dissector for Samsung's samsung-ipc protocol
* Copyright 2022, Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/packet.h>
void proto_register_samsung_ipc(void);
void proto_reg_handoff_samsung_ipc(void);
#define SAMSUNG_IPC_HDLC_START 0x7f
#define SAMSUNG_IPC_HDLC_END 0x7e
#if 0 /* This is to avoid defined but not used errors */
static const value_string ipc_requests_types[] = {
{0x01, "IPC_TYPE_EXEC"},
{0x02, "IPC_TYPE_GET"},
{0x03, "IPC_TYPE_SET"},
{0x04, "IPC_TYPE_CFRM"},
{0x05, "IPC_TYPE_EVENT"},
};
static const value_string ipc_responses_types[] = {
{0x01, "IPC_TYPE_INDI"},
{0x02, "IPC_TYPE_RESP"},
{0x03, "IPC_TYPE_NOTI"},
};
static const value_string hf_samsung_ipc_groups[] = {
{0x01, "PWR"},
{0x02, "CALL"},
{0x04, "SMS"},
{0x05, "SEC"},
{0x06, "PB"},
{0x07, "DISP"},
{0x08, "NET"},
{0x09, "SND"},
{0x0A, "MISC"},
{0x0B, "SVC"},
{0x0C, "SS"},
{0x0D, "GPRS"},
{0x0E, "SAT"},
{0x0F, "CFG"},
{0x10, "IMEI"},
{0x11, "GPS"},
{0x12, "SAP"},
{0x42, "RFS"},
{0x80, "GEN"},
};
#endif
static gint proto_samsung_ipc = -1;
static gint hf_samsung_ipc = -1; // TODO: check variable name with isi
static gint ett_samsung_ipc = -1;
static int dissect_samsung_ipc(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree _U_, void *data _U_)
{
// proto_tree *samsung_ipc_tree;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "samsung-ipc");
col_clear(pinfo->cinfo, COL_INFO);
proto_tree_add_item(tree, proto_samsung_ipc, tvb, 0, -1, ENC_NA);
// samsung_ipc_tree = proto_item_add_subtree(samsung_ipc_tree, ett_samsung_ipc);
// proto_tree_add_item(samsung_ipc_tree, hf_samsung_ipc_groups, tvb, 7, 1, ENC_NA);
return tvb_captured_length(tvb);
}
static gboolean dissect_single_usb_samsung_ipc(tvbuff_t *tvb,
packet_info *pinfo,
proto_tree *tree,
void *data, guint offset,
guint *length)
{
tvbuff_t *next_tvb;
guint tlv_length;
tlv_length = tvb_reported_length(tvb);
/* The length field is at 4 and its size is 2 */
if (tlv_length - offset < 5)
return FALSE;
if (tvb_get_guint8(tvb, offset) != SAMSUNG_IPC_HDLC_START)
return FALSE;
/* From HDLC_START to HDLC_END */
*length = tvb_get_letohs(tvb, offset + 4);
*length += 5;
if (offset + *length > tlv_length)
return FALSE;
if (tvb_get_guint8(tvb, offset + *length - 1) != SAMSUNG_IPC_HDLC_END)
return FALSE;
/* TODO: get the IPC channel from the USB enpoint
* From the device tree:
* 0x01 -> FMT
* 0x41 -> RFS
* 0x2a -> RAW
* 0x2b -> RAW
*/
/* Strip off the HDLC_START and HDLC_END */
next_tvb = tvb_new_subset_length(tvb, offset + 1, *length - 2);
dissect_samsung_ipc(next_tvb, pinfo, tree, data);
return TRUE;
}
static gboolean dissect_usb_samsung_ipc(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, void *data)
{
gboolean found;
guint offset;
guint usb_sipc_length;
guint tlv_length;
tlv_length = tvb_reported_length(tvb);
found = dissect_single_usb_samsung_ipc(tvb, pinfo, tree, data,
0, &usb_sipc_length);
/* [HDLC_START:1][?:1][?:1][?:1][len:2][data:len-2][HDLC_END:1] */
if (!found || tlv_length == usb_sipc_length)
return found;
/* An USB packet might have more than one samsung-ipc packet
* inside
*/
offset = usb_sipc_length;
while(true) {
gboolean _found;
_found = dissect_single_usb_samsung_ipc(tvb, pinfo, tree, data,
offset,
&usb_sipc_length);
if (!_found || tlv_length == offset + usb_sipc_length)
return found;
offset += usb_sipc_length;
}
}
void proto_register_samsung_ipc(void)
{
static hf_register_info hf[] = {
{ &hf_samsung_ipc,
{
"group",
"samsung-ipc.group",
FT_UINT8,
BASE_HEX, // BASE_DEC ?
NULL, // VALS(hf_samsung_ipc_groups),
0x0,
NULL,
HFILL
}
},
};
static gint *ett[] = {
&ett_samsung_ipc
};
proto_samsung_ipc = proto_register_protocol("Samsung IPC",
"samsung-ipc",
"samsung-ipc");
proto_register_field_array(proto_samsung_ipc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/* Handler registration */
void proto_reg_handoff_samsung_ipc(void)
{
static gboolean initialized = FALSE;
if (!initialized) {
create_dissector_handle(dissect_samsung_ipc, proto_samsung_ipc);
heur_dissector_add("usb.bulk",
dissect_usb_samsung_ipc,
"samsung-ipc bulk endpoint",
"usb_bulk_samsung_ipc",
proto_samsung_ipc,
HEURISTIC_DISABLE);
}
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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