/* packet-btavctp.c

 * Routines for Bluetooth AVCTP dissection

 *

 * Copyright 2012, 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/decode_as.h>

#include <epan/proto_data.h>

#include "packet-bluetooth.h"

#include "packet-btl2cap.h"

#include "packet-btsdp.h"

#include "packet-btavctp.h"

#define PACKET_TYPE_SINGLE    0x00

#define PACKET_TYPE_START     0x01

#define PACKET_TYPE_CONTINUE  0x02

#define PACKET_TYPE_END       0x03

int proto_btavctp;

static int hf_btavctp_transaction;

static int hf_btavctp_packet_type;

static int hf_btavctp_cr;

static int hf_btavctp_ipid;

static int hf_btavctp_rfa;

static int hf_btavctp_pid;

static int hf_btavctp_number_of_packets;

static int ett_btavctp;

static expert_field ei_btavctp_unexpected_frame;

static expert_field ei_btavctp_invalid_profile;

static dissector_handle_t btavctp_handle;

typedef struct _fragment_t {

    unsigned   length;

    uint8_t *data;

} fragment_t;

typedef struct _fragments_t {

    uint32_t     interface_id;

    uint32_t     adapter_id;

    uint32_t     chandle;

    uint32_t     psm;

    uint32_t     count;

    uint32_t     number_of_packets;

    uint32_t     pid;

    wmem_tree_t  *fragment;

} fragments_t;

static wmem_tree_t *reassembling;

static fragments_t *fragments;

static const value_string packet_type_vals[] = {

    { PACKET_TYPE_SINGLE,   "Single" },

    { PACKET_TYPE_START,    "Start" },

    { PACKET_TYPE_CONTINUE, "Continue" },

    { PACKET_TYPE_END,      "End" },

    { 0, NULL }

};

static const value_string cr_vals[] = {

    { 0x00,   "Command" },

    { 0x01,   "Response" },

    { 0, NULL }

};

static const value_string ipid_vals[] = {

    { 0x00,   "Profile OK" },

    { 0x01,   "Invalid profile" },

    { 0, NULL }

};

void proto_register_btavctp(void);

void proto_reg_handoff_btavctp(void);

static int

dissect_btavctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)

{

    proto_item      *ti;

    proto_tree      *btavctp_tree;

    proto_item      *pitem;

    proto_item      *ipid_item = NULL;

    btavctp_data_t  *avctp_data;

    tvbuff_t        *next_tvb;

    int             offset = 0;

    unsigned        packet_type;

    unsigned        cr;

    unsigned        pid = 0;

    unsigned        transaction;

    unsigned        number_of_packets = 0;

    unsigned        length;

    unsigned        i_frame;

    bool            ipid = false;

    uint32_t        interface_id;

    uint32_t        adapter_id;

    uint32_t        chandle;

    uint32_t        psm;

    int             previous_proto;

    previous_proto = (GPOINTER_TO_INT(wmem_list_frame_data(wmem_list_frame_prev(wmem_list_tail(pinfo->layers)))));

    if (previous_proto == proto_btl2cap) {

        btl2cap_data_t  *l2cap_data;

        l2cap_data = (btl2cap_data_t *) data;

        interface_id = l2cap_data->interface_id;

        adapter_id   = l2cap_data->adapter_id;

        chandle      = l2cap_data->chandle;

        psm          = l2cap_data->psm;

    } else {

        interface_id = HCI_INTERFACE_DEFAULT;

        adapter_id   = HCI_ADAPTER_DEFAULT;

        chandle      = 0;

        psm          = 0;

    }

    ti = proto_tree_add_item(tree, proto_btavctp, tvb, offset, tvb_captured_length_remaining(tvb, offset), ENC_NA);

    btavctp_tree = proto_item_add_subtree(ti, ett_btavctp);

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "AVCTP");

    col_clear(pinfo->cinfo, COL_INFO);

    switch (pinfo->p2p_dir) {

        case P2P_DIR_SENT:

            col_set_str(pinfo->cinfo, COL_INFO, "Sent ");

            break;

        case P2P_DIR_RECV:

            col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");

            break;

        default:

            col_set_str(pinfo->cinfo, COL_INFO, "UnknownDirection ");

            break;

    }

    proto_tree_add_item(btavctp_tree, hf_btavctp_transaction,  tvb, offset, 1, ENC_BIG_ENDIAN);

    pitem = proto_tree_add_item(btavctp_tree, hf_btavctp_packet_type,  tvb, offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(btavctp_tree, hf_btavctp_cr,  tvb, offset, 1, ENC_BIG_ENDIAN);

    transaction = tvb_get_uint8(tvb, offset) >> 4;

    packet_type = (tvb_get_uint8(tvb, offset) & 0x0C) >> 2;

    cr = (tvb_get_uint8(tvb, offset) & 0x02) >> 1 ;

    if (packet_type == PACKET_TYPE_SINGLE || packet_type == PACKET_TYPE_START) {

        ipid_item = proto_tree_add_item(btavctp_tree, hf_btavctp_ipid,  tvb, offset, 1, ENC_BIG_ENDIAN);

        ipid = tvb_get_uint8(tvb, offset) & 0x01;

    } else {

        proto_tree_add_item(btavctp_tree, hf_btavctp_rfa,  tvb, offset, 1, ENC_BIG_ENDIAN);

    }

    offset++;

    if (packet_type == PACKET_TYPE_START) {

        proto_tree_add_item(btavctp_tree, hf_btavctp_number_of_packets,  tvb, offset, 1, ENC_BIG_ENDIAN);

        number_of_packets = tvb_get_uint8(tvb, offset);

        offset++;

    }

    if (packet_type == PACKET_TYPE_SINGLE || packet_type == PACKET_TYPE_START) {

        proto_tree_add_item(btavctp_tree, hf_btavctp_pid,  tvb, offset, 2, ENC_BIG_ENDIAN);

        pid = tvb_get_ntohs(tvb, offset);

        if (p_get_proto_data(pinfo->pool, pinfo, proto_bluetooth, PROTO_DATA_BLUETOOTH_SERVICE_UUID ) == NULL) {

            char *value_data;

            bluetooth_uuid_t  uuid;

            uuid.size = 2;

            uuid.bt_uuid = pid;

            uuid.data[0] = pid >> 8;

            uuid.data[1] = pid & 0xFF;

            value_data = wmem_strdup(wmem_file_scope(), print_numeric_bluetooth_uuid(pinfo->pool, &uuid));

            p_add_proto_data(pinfo->pool, pinfo, proto_bluetooth, PROTO_DATA_BLUETOOTH_SERVICE_UUID, value_data);

        }

        offset +=2;

    }

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s - Transaction: %u, PacketType: %s",

            val_to_str_const(cr, cr_vals, "unknown CR"), transaction,

            val_to_str_const(packet_type, packet_type_vals, "unknown packet type"));

    if (ipid) {

        expert_add_info(pinfo, ipid_item, &ei_btavctp_invalid_profile);

        col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Invalid profile");

        if (tvb_captured_length_remaining(tvb, offset) == 0)

            return offset;

    }

    avctp_data = wmem_new(pinfo->pool, btavctp_data_t);

    avctp_data->cr           = cr;

    avctp_data->interface_id = interface_id;

    avctp_data->adapter_id   = adapter_id;

    avctp_data->chandle      = chandle;

    avctp_data->psm          = psm;

    length = tvb_reported_length_remaining(tvb, offset);

    /* reassembling */

    next_tvb = tvb_new_subset_length(tvb, offset, length);

    if (packet_type == PACKET_TYPE_SINGLE) {

        bluetooth_uuid_t  uuid;

        uuid.size = 2;

        uuid.bt_uuid = pid;

        uuid.data[0] = pid >> 8;

        uuid.data[1] = pid & 0xFF;

        if (!dissector_try_string_with_data(bluetooth_uuid_table, print_numeric_bluetooth_uuid(pinfo->pool, &uuid), next_tvb, pinfo, tree, true, avctp_data)) {

            call_data_dissector(next_tvb, pinfo, tree);

        }

    } else {

        fragment_t     *fragment;

        wmem_tree_key_t key[6];

        uint32_t        frame_number;

        frame_number = pinfo->num;

        key[0].length = 1;

        key[0].key = &interface_id;

        key[1].length = 1;

        key[1].key = &adapter_id;

        key[2].length = 1;

        key[2].key = &chandle;

        key[3].length = 1;

        key[3].key = &psm;

        key[4].length = 1;

        key[4].key = &frame_number;

        key[5].length = 0;

        key[5].key = NULL;

        if (packet_type == PACKET_TYPE_START) {

            if (!pinfo->fd->visited) {

                fragment = wmem_new(wmem_file_scope(), fragment_t);

                fragment->length = length;

                fragment->data = (uint8_t *) wmem_alloc(wmem_file_scope(), fragment->length);

                tvb_memcpy(tvb, fragment->data, offset, fragment->length);

                fragments = wmem_new(wmem_file_scope(), fragments_t);

                fragments->number_of_packets = number_of_packets;

                fragments->pid = pid;

                fragments->count = 1;

                fragments->fragment = wmem_tree_new(wmem_file_scope());

                wmem_tree_insert32(fragments->fragment, fragments->count, fragment);

                fragments->interface_id = interface_id;

                fragments->adapter_id   = adapter_id;

                fragments->chandle      = chandle;

                fragments->psm          = psm;

                wmem_tree_insert32_array(reassembling, key, fragments);

            } else {

                fragments = (fragments_t *)wmem_tree_lookup32_array_le(reassembling, key);

                if (!(fragments && fragments->interface_id == interface_id &&

                        fragments->adapter_id == adapter_id &&

                        fragments->chandle == chandle &&

                        fragments->psm == psm))

                    fragments = NULL;

            }

            call_data_dissector(next_tvb, pinfo, tree);

        } else if (packet_type == PACKET_TYPE_CONTINUE) {

            fragments = (fragments_t *)wmem_tree_lookup32_array_le(reassembling, key);

            if (!(fragments && fragments->interface_id == interface_id &&

                    fragments->adapter_id == adapter_id &&

                    fragments->chandle == chandle &&

                    fragments->psm == psm))

                fragments = NULL;

            if (!pinfo->fd->visited && fragments != NULL) {

                fragment = wmem_new(wmem_file_scope(), fragment_t);

                fragment->length = length;

                fragment->data = (uint8_t *) wmem_alloc(wmem_file_scope(), fragment->length);

                tvb_memcpy(tvb, fragment->data, offset, fragment->length);

                fragments->count++;

                wmem_tree_insert32(fragments->fragment, fragments->count, fragment);

                fragments->interface_id = interface_id;

                fragments->adapter_id   = adapter_id;

                fragments->chandle      = chandle;

                fragments->psm          = psm;

                frame_number = pinfo->num;

                key[0].length = 1;

                key[0].key = &interface_id;

                key[1].length = 1;

                key[1].key = &adapter_id;

                key[2].length = 1;

                key[2].key = &chandle;

                key[3].length = 1;

                key[3].key = &psm;

                key[4].length = 1;

                key[4].key = &frame_number;

                key[5].length = 0;

                key[5].key = NULL;

                wmem_tree_insert32_array(reassembling, key, fragments);

            }

            call_data_dissector(next_tvb, pinfo, tree);

        } else if (packet_type == PACKET_TYPE_END) {

            fragments = (fragments_t *)wmem_tree_lookup32_array_le(reassembling, key);

            if (!(fragments && fragments->interface_id == interface_id &&

                    fragments->adapter_id == adapter_id &&

                    fragments->chandle == chandle &&

                    fragments->psm == psm))

                fragments = NULL;

            if (!pinfo->fd->visited && fragments != NULL) {

                fragment = wmem_new(wmem_file_scope(), fragment_t);

                fragment->length = length;

                fragment->data = (uint8_t *) wmem_alloc(wmem_file_scope(), fragment->length);

                tvb_memcpy(tvb, fragment->data, offset, fragment->length);

                fragments->count++;

                wmem_tree_insert32(fragments->fragment, fragments->count, fragment);

                fragments->interface_id = interface_id;

                fragments->adapter_id   = adapter_id;

                fragments->chandle      = chandle;

                fragments->psm          = psm;

                frame_number = pinfo->num;

                key[0].length = 1;

                key[0].key = &interface_id;

                key[1].length = 1;

                key[1].key = &adapter_id;

                key[2].length = 1;

                key[2].key = &chandle;

                key[3].length = 1;

                key[3].key = &psm;

                key[4].length = 1;

                key[4].key = &frame_number;

                key[5].length = 0;

                key[5].key = NULL;

                wmem_tree_insert32_array(reassembling, key, fragments);

            }

            length = 0;

            if (!fragments || fragments->count != fragments->number_of_packets) {

                expert_add_info(pinfo, pitem, &ei_btavctp_unexpected_frame);

                call_data_dissector(next_tvb, pinfo, tree);

            } else {

                uint8_t  *reassembled = NULL;

                bluetooth_uuid_t  uuid;

                for (i_frame = 1; i_frame <= fragments->count; ++i_frame) {

                    fragment = (fragment_t *)wmem_tree_lookup32_le(fragments->fragment, i_frame);

                    if (fragment) {

                        reassembled = (uint8_t*)wmem_realloc(pinfo->pool, reassembled, length + fragment->length);

                        memcpy(reassembled + length, fragment->data, fragment->length);

                        length += fragment->length;

                    }

                }

                next_tvb = tvb_new_child_real_data(tvb, reassembled, length, length);

                add_new_data_source(pinfo, next_tvb, "Reassembled AVCTP");

                uuid.size = 2;

                uuid.bt_uuid = fragments->pid;

                uuid.data[0] = fragments->pid >> 8;

                uuid.data[1] = fragments->pid & 0xFF;

                if (!dissector_try_string_with_data(bluetooth_uuid_table, print_numeric_bluetooth_uuid(pinfo->pool, &uuid), next_tvb, pinfo, tree, true, avctp_data)) {

                    call_data_dissector(next_tvb, pinfo, tree);

                }

            }

            fragments = NULL;

        } else {

            call_data_dissector(next_tvb, pinfo, tree);

        }

    }

    return offset;

}

void

proto_register_btavctp(void)

{

    module_t *module;

    expert_module_t* expert_btavctp;

    static hf_register_info hf[] = {

        { &hf_btavctp_transaction,

            { "Transaction",          "btavctp.transaction",

            FT_UINT8, BASE_HEX, NULL, 0xF0,

            NULL, HFILL }

        },

        { &hf_btavctp_packet_type,

            { "Packet Type",          "btavctp.packet_type",

            FT_UINT8, BASE_HEX, VALS(packet_type_vals), 0x0C,

            NULL, HFILL }

        },

        { &hf_btavctp_cr,

            { "C/R",                  "btavctp.cr",

            FT_UINT8, BASE_HEX, VALS(cr_vals), 0x02,

            NULL, HFILL }

        },

        { &hf_btavctp_ipid,

            { "IPID",                 "btavctp.ipid",

            FT_UINT8, BASE_HEX, VALS(ipid_vals), 0x01,

            NULL, HFILL }

        },

        { &hf_btavctp_rfa,

            { "RFA",                  "btavctp.rfa",

            FT_UINT8, BASE_HEX, NULL, 0x01,

            NULL, HFILL }

        },

        { &hf_btavctp_pid,

            { "Profile Identifier",   "btavctp.pid",

            FT_UINT16, BASE_HEX|BASE_EXT_STRING, &bluetooth_uuid_vals_ext, 0x00,

            NULL, HFILL }

        },

        { &hf_btavctp_number_of_packets,

            { "Number of packets",    "btavctp.nop",

            FT_UINT8, BASE_DEC, NULL, 0x00,

            NULL, HFILL }

        }

    };

    static int *ett[] = {

        &ett_btavctp

    };

    static ei_register_info ei[] = {

        { &ei_btavctp_unexpected_frame, { "btavctp.unexpected_frame", PI_PROTOCOL, PI_WARN, "Unexpected frame", EXPFILL }},

        { &ei_btavctp_invalid_profile,  { "btavctp.invalid_profile",  PI_PROTOCOL, PI_NOTE, "Invalid Profile", EXPFILL }},

    };

    /* Decode As handling */

    reassembling = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());

    proto_btavctp = proto_register_protocol("Bluetooth AVCTP Protocol", "BT AVCTP", "btavctp");

    btavctp_handle = register_dissector("btavctp", dissect_btavctp, proto_btavctp);

    proto_register_field_array(proto_btavctp, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    expert_btavctp = expert_register_protocol(proto_btavctp);

    expert_register_field_array(expert_btavctp, ei, array_length(ei));

    module = prefs_register_protocol_subtree("Bluetooth", proto_btavctp, NULL);

    prefs_register_static_text_preference(module, "avctp.version",

            "Bluetooth Protocol AVCTP version: 1.4",

            "Version of protocol supported by this dissector.");

}

void

proto_reg_handoff_btavctp(void)

{

    dissector_add_string("bluetooth.uuid", "17", btavctp_handle);

    dissector_add_uint("btl2cap.psm", BTL2CAP_PSM_AVCTP_CTRL, btavctp_handle);

    dissector_add_uint("btl2cap.psm", BTL2CAP_PSM_AVCTP_BRWS, btavctp_handle);

    dissector_add_for_decode_as("btl2cap.cid", btavctp_handle);

}

/*

 * 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:

 */