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wireshark/epan/dissectors/file-btsnoop.c

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/* file-btsnoop.c
* Routines for BTSNOOP File Format
*
* Copyright 2014, Michal Labedzki for Tieto Corporation
*
* 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/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/wmem_scopes.h>
#include <wiretap/wtap.h>
static dissector_handle_t btsnoop_handle;
static dissector_handle_t hci_h1_handle;
static dissector_handle_t hci_h4_handle;
static dissector_handle_t hci_mon_handle;
static int proto_btsnoop = -1;
static int hf_btsnoop_header = -1;
static int hf_btsnoop_magic_bytes = -1;
static int hf_btsnoop_version = -1;
static int hf_btsnoop_datalink = -1;
static int hf_btsnoop_frame = -1;
static int hf_btsnoop_origin_length = -1;
static int hf_btsnoop_included_length = -1;
static int hf_btsnoop_flags = -1;
static int hf_btsnoop_cumulative_dropped_packets = -1;
static int hf_btsnoop_timestamp_microseconds = -1;
static int hf_btsnoop_payload = -1;
static int hf_btsnoop_flags_h1_reserved = -1;
static int hf_btsnoop_flags_h1_channel_type = -1;
static int hf_btsnoop_flags_h1_direction = -1;
static int hf_btsnoop_flags_h4_reserved = -1;
static int hf_btsnoop_flags_h4_direction = -1;
static int hf_btsnoop_flags_linux_monitor_opcode = -1;
static int hf_btsnoop_flags_linux_monitor_adapter_id = -1;
static expert_field ei_malformed_frame = EI_INIT;
static expert_field ei_not_implemented_yet = EI_INIT;
static expert_field ei_unknown_data = EI_INIT;
static gint ett_btsnoop = -1;
static gint ett_btsnoop_header = -1;
static gint ett_btsnoop_frame = -1;
static gint ett_btsnoop_payload = -1;
static gint ett_btsnoop_flags = -1;
static gboolean pref_dissect_next_layer = FALSE;
extern value_string_ext hci_mon_opcode_vals_ext;
static const value_string datalink_vals[] = {
{ 1001, "H1" },
{ 1002, "H4 (UART)" },
{ 1003, "BCSP" },
{ 1004, "H5 (3 Wire)" },
{ 2001, "Linux Monitor" },
{ 2002, "Simulator" },
{ 0, NULL }
};
static const value_string flags_direction_vals[] = {
{ 0x00, "Received" },
{ 0x01, "Sent" },
{ 0, NULL }
};
static const value_string flags_h1_channel_type_vals[] = {
{ 0x00, "ACL" },
{ 0x01, "HCI" },
{ 0, NULL }
};
void proto_register_btsnoop(void);
void proto_reg_handoff_btsnoop(void);
static int
dissect_btsnoop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
static const guint8 magic[] = { 'b', 't', 's', 'n', 'o', 'o', 'p', 0};
gint offset = 0;
guint32 datalink;
guint32 flags;
guint32 length;
proto_tree *main_tree;
proto_item *main_item;
proto_tree *header_tree;
proto_item *header_item;
proto_tree *frame_tree;
proto_item *frame_item;
proto_tree *flags_tree;
proto_item *flags_item;
proto_tree *payload_tree;
proto_item *payload_item;
static guint32 frame_number = 1;
tvbuff_t *next_tvb;
nstime_t timestamp;
guint64 ts;
if (tvb_memeql(tvb, 0, magic, sizeof(magic)) != 0)
return 0;
if (offset == 0) frame_number = 1;
main_item = proto_tree_add_item(tree, proto_btsnoop, tvb, offset, -1, ENC_NA);
main_tree = proto_item_add_subtree(main_item, ett_btsnoop);
header_item = proto_tree_add_item(main_tree, hf_btsnoop_header, tvb, offset, sizeof(magic) + 4 + 4, ENC_NA);
header_tree = proto_item_add_subtree(header_item, ett_btsnoop_header);
proto_tree_add_item(header_tree, hf_btsnoop_magic_bytes, tvb, offset, sizeof(magic), ENC_ASCII | ENC_NA);
offset += (gint)sizeof(magic);
proto_tree_add_item(header_tree, hf_btsnoop_version, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(header_tree, hf_btsnoop_datalink, tvb, offset, 4, ENC_BIG_ENDIAN);
datalink = tvb_get_ntohl(tvb, offset);
offset += 4;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
frame_item = proto_tree_add_item(main_tree, hf_btsnoop_frame, tvb, offset, 0, ENC_NA);
frame_tree = proto_item_add_subtree(frame_item, ett_btsnoop_frame);
if (tvb_reported_length_remaining(tvb, offset) < 4 * 4 + 8) {
expert_add_info(pinfo, frame_item, &ei_malformed_frame);
}
proto_item_append_text(frame_item, " %u", frame_number);
proto_tree_add_item(frame_tree, hf_btsnoop_origin_length, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(frame_tree, hf_btsnoop_included_length, tvb, offset, 4, ENC_BIG_ENDIAN);
length = tvb_get_ntohl(tvb, offset);
offset += 4;
flags_item = proto_tree_add_item(frame_tree, hf_btsnoop_flags, tvb, offset, 4, ENC_BIG_ENDIAN);
flags_tree = proto_item_add_subtree(flags_item, ett_btsnoop_flags);
flags = tvb_get_ntohl(tvb, offset);
switch (datalink) {
case 1001: /* H1 */
proto_tree_add_item(flags_tree, hf_btsnoop_flags_h1_reserved, tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_btsnoop_flags_h1_channel_type, tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_btsnoop_flags_h1_direction, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case 1002: /* H4 */
proto_tree_add_item(flags_tree, hf_btsnoop_flags_h4_reserved, tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_btsnoop_flags_h4_direction, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case 2001: /* Linux Monitor */
proto_tree_add_item(flags_tree, hf_btsnoop_flags_linux_monitor_adapter_id, tvb, offset , 2, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_btsnoop_flags_linux_monitor_opcode, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
break;
}
offset += 4;
proto_tree_add_item(frame_tree, hf_btsnoop_cumulative_dropped_packets, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
ts = tvb_get_ntoh64(tvb, offset) - G_GINT64_CONSTANT(0x00dcddb30f2f8000);
timestamp.secs = (guint)(ts / 1000000);
timestamp.nsecs =(guint)((ts % 1000000) * 1000);
proto_tree_add_time(frame_tree, hf_btsnoop_timestamp_microseconds, tvb, offset, 8, &timestamp);
offset += 8;
payload_item = proto_tree_add_item(frame_tree, hf_btsnoop_payload, tvb, offset, length, ENC_NA);
payload_tree = proto_item_add_subtree(payload_item, ett_btsnoop_payload);
if (pref_dissect_next_layer) switch (datalink) {\
case 1001: /* H1 */
pinfo->num = frame_number;
pinfo->abs_ts = timestamp;
pinfo->pseudo_header->bthci.sent = (flags & 0x01) ? FALSE : TRUE;
if (flags & 0x02) {
if(pinfo->pseudo_header->bthci.sent)
pinfo->pseudo_header->bthci.channel = BTHCI_CHANNEL_COMMAND;
else
pinfo->pseudo_header->bthci.channel = BTHCI_CHANNEL_EVENT;
} else {
pinfo->pseudo_header->bthci.channel = BTHCI_CHANNEL_ACL;
}
next_tvb = tvb_new_subset_length_caplen(tvb, offset, length, length);
call_dissector(hci_h1_handle, next_tvb, pinfo, payload_tree);
break;
case 1002: /* H4 */
pinfo->num = frame_number;
pinfo->abs_ts = timestamp;
pinfo->p2p_dir = (flags & 0x01) ? P2P_DIR_RECV : P2P_DIR_SENT;
next_tvb = tvb_new_subset_length_caplen(tvb, offset, length, length);
call_dissector(hci_h4_handle, next_tvb, pinfo, payload_tree);
break;
case 2001: /* Linux Monitor */
pinfo->num = frame_number;
pinfo->abs_ts = timestamp;
pinfo->pseudo_header->btmon.opcode = flags & 0xFFFF;
pinfo->pseudo_header->btmon.adapter_id = flags >> 16;
next_tvb = tvb_new_subset_length_caplen(tvb, offset, length, length);
call_dissector(hci_mon_handle, next_tvb, pinfo, payload_tree);
break;
case 1003: /* BCSP */
case 1004: /* H5 (3 Wire) */
case 2002: /* Simulator */
/* Not implemented yet */
proto_tree_add_expert(payload_tree, pinfo, &ei_not_implemented_yet, tvb, offset, length);
break;
default:
/* Unknown */
proto_tree_add_expert(payload_tree, pinfo, &ei_unknown_data, tvb, offset, length);
}
offset += length;
proto_item_set_len(frame_item, 4 * 4 + 8 + length);
frame_number += 1;
}
return offset;
}
static gboolean
dissect_btsnoop_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return dissect_btsnoop(tvb, pinfo, tree, NULL) > 0;
}
void
proto_register_btsnoop(void)
{
module_t *module;
expert_module_t *expert_module;
static hf_register_info hf[] = {
{ &hf_btsnoop_header,
{ "Header", "btsnoop.header",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_magic_bytes,
{ "Magic Bytes", "btsnoop.header.magic_bytes",
FT_STRINGZ, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_version,
{ "Version", "btsnoop.header.version",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_datalink,
{ "Datalink", "btsnoop.header.datalink",
FT_UINT32, BASE_DEC_HEX, VALS(datalink_vals), 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_frame,
{ "Frame", "btsnoop.frame",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_origin_length,
{ "Origin Length", "btsnoop.frame.origin_length",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_included_length,
{ "Included Length", "btsnoop.frame.included_length",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_flags,
{ "Flags", "btsnoop.frame.flags",
FT_UINT32, BASE_HEX, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_cumulative_dropped_packets,
{ "Cumulative Dropped Packets", "btsnoop.frame.cumulative_dropped_packets",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_timestamp_microseconds,
{ "Timestamp Microseconds", "btsnoop.frame.timestamp_microseconds",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_payload,
{ "Payload", "btsnoop.frame.payload",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_flags_h1_reserved,
{ "Reserved", "btsnoop.frame.flags.h1.reserved",
FT_UINT32, BASE_HEX, NULL, 0xFFFFFFFC,
NULL, HFILL }
},
{ &hf_btsnoop_flags_h1_channel_type,
{ "Channel Type", "btsnoop.frame.flags.h1.channel_type",
FT_UINT32, BASE_DEC, VALS(flags_h1_channel_type_vals), 0x02,
NULL, HFILL }
},
{ &hf_btsnoop_flags_h1_direction,
{ "Direction", "btsnoop.frame.flags.h1.direction",
FT_UINT32, BASE_DEC, VALS(flags_direction_vals), 0x01,
NULL, HFILL }
},
{ &hf_btsnoop_flags_h4_reserved,
{ "Reserved", "btsnoop.frame.flags.h4.reserved",
FT_UINT32, BASE_HEX, NULL, 0xFFFFFFFE,
NULL, HFILL }
},
{ &hf_btsnoop_flags_h4_direction,
{ "Direction", "btsnoop.frame.flags.h4.direction",
FT_UINT32, BASE_DEC, VALS(flags_direction_vals), 0x01,
NULL, HFILL }
},
{ &hf_btsnoop_flags_linux_monitor_opcode,
{ "Opcode", "btsnoop.frame.flags.linux_monitor.opcode",
FT_UINT16, BASE_HEX | BASE_EXT_STRING, &hci_mon_opcode_vals_ext, 0x00,
NULL, HFILL }
},
{ &hf_btsnoop_flags_linux_monitor_adapter_id,
{ "Adapter ID", "btsnoop.frame.flags.linux_monitor.adapter_id",
FT_UINT16, BASE_DEC, NULL, 0x00,
NULL, HFILL }
}
};
static ei_register_info ei[] = {
{ &ei_malformed_frame, { "btsnoop.malformed_frame", PI_PROTOCOL, PI_WARN, "Malformed Frame", EXPFILL }},
{ &ei_not_implemented_yet, { "btsnoop.not_implemented_yet", PI_PROTOCOL, PI_WARN, "Not implemented yet", EXPFILL }},
{ &ei_unknown_data, { "btsnoop.unknown_data", PI_PROTOCOL, PI_WARN, "Unknown data", EXPFILL }},
};
static gint *ett[] = {
&ett_btsnoop,
&ett_btsnoop_header,
&ett_btsnoop_frame,
&ett_btsnoop_payload,
&ett_btsnoop_flags,
};
proto_btsnoop = proto_register_protocol("Symbian OS BTSNOOP File Format", "BTSNOOP", "btsnoop");
proto_register_field_array(proto_btsnoop, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
btsnoop_handle = register_dissector("btsnoop", dissect_btsnoop, proto_btsnoop);
module = prefs_register_protocol(proto_btsnoop, NULL);
prefs_register_static_text_preference(module, "version",
"BTSNOOP version: 1",
"Version of file-format supported by this dissector.");
prefs_register_bool_preference(module, "dissect_next_layer",
"Dissect next layer",
"Dissect next layer",
&pref_dissect_next_layer);
expert_module = expert_register_protocol(proto_btsnoop);
expert_register_field_array(expert_module, ei, array_length(ei));
}
void
proto_reg_handoff_btsnoop(void)
{
hci_h1_handle = find_dissector_add_dependency("hci_h1", proto_btsnoop);
hci_h4_handle = find_dissector_add_dependency("hci_h4", proto_btsnoop);
hci_mon_handle = find_dissector_add_dependency("hci_mon", proto_btsnoop);
heur_dissector_add("wtap_file", dissect_btsnoop_heur, "BTSNOOP file", "btsnoop_wtap", proto_btsnoop, HEURISTIC_ENABLE);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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