/* packet-kdsp.c

 * Routines for Kismet Drone/Server Protocol packet disassembly

 * By Kyle Feuz <kyle.feuz@aggiemail.usu.edu>

 * Copyright 2011 Kyle Feuz

 *

 * 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/expert.h>

#include "packet-tcp.h"

void proto_register_kdsp(void);

void proto_reg_handoff_kdsp(void);

static dissector_handle_t kdsp_handle;

#define KDSP_PORT 2502 /* Not IANA registered */

#define FRAME_HEADER_LEN 12

#define CMD_NULL   0

#define HELLO      1

#define STRING     2

#define CAPPACKET  3

#define CHANNELSET 4

#define SOURCE     5

#define REPORT     6

#define CPT_FLAG   0x80000000

#define FCS_FLAG   0x00000004

#define GPS_FLAG   0x00000002

#define RADIO_FLAG 0x00000001

#define RADIO_ACCURACY_FLAG    0x000000

#define RADIO_FREQ_MHZ_FLAG    0x000000

#define RADIO_SIGNAL_DBM_FLAG  0x000000

#define RADIO_NOISE_DBM_FLAG   0x000000

#define RADIO_CARRIER_FLAG     0x000000

#define RADIO_ENCODING_FLAG    0x000000

#define RADIO_DATARATE_FLAG    0x000000

#define RADIO_SIGNAL_RSSI_FLAG 0x000000

#define RADIO_NOISE_RSSI_FLAG  0x000000

#define GPS_FIX_FLAG      0x000000

#define GPS_LAT_FLAG      0x000000

#define GPS_LON_FLAG      0x000000

#define GPS_ALT_FLAG      0x000000

#define GPS_SPD_FLAG      0x000000

#define GPS_HEADING_FLAG  0x000000

#define DATA_UUID_FLAG    0x00000010

#define DATA_PACKLEN_FLAG 0x00000008

#define DATA_TVSEC_FLAG   0x00000004

#define DATA_TVUSEC_FLAG  0x00000002

#define DATA_DLT_FLAG     0x00000001

#define CH_UUID_FLAG      0x00000001

#define CH_CMD_FLAG       0x00000002

#define CH_CURCH_FLAG     0x00000004

#define CH_HOP_FLAG       0x00000008

#define CH_NUMCH_FLAG     0x00000010

#define CH_CHANNELS_FLAG  0x00000020

#define CH_DWELL_FLAG     0x00000040

#define CH_RATE_FLAG      0x00000080

#define CH_HOPDWELL_FLAG  0x00000100

#define SRC_UUID_FLAG     0x00000001

#define SRC_INVALID_FLAG  0x00000002

#define SRC_NAMESTR_FLAG  0x00000004

#define SRC_INTSTR_FLAG   0x00000008

#define SRC_TYPESTR_FLAG  0x00000010

#define SRC_HOP_FLAG      0x00000020

#define SRC_DWELL_FLAG    0x00000040

#define SRC_RATE_FLAG     0x00000080

#define REPORT_UUID_FLAG        0x000000

#define REPORT_FLAGS_FLAG       0x000000

#define REPORT_HOP_TM_SEC_FLAG  0x000000

#define REPORT_HOP_TM_USEC_FLAG 0x000000

#define DATALINK_WLAN 0x69

#define DATALINK_RADIOTAP 0x7F

static int proto_kdsp;

static dissector_table_t  subdissector_dlt_table;

static const value_string packettypenames[] = {

  {0, "NULL"},

  {1, "HELLO"},

  {2, "STRING"},

  {3, "CAPPACKET"},

  {4, "CHANNELSET"},

  {5, "SOURCE"},

  {6, "REPORT"},

  {0, NULL}

};

static const value_string payloadtypenames[] = {

  {DATALINK_WLAN, "802.11"},

  {DATALINK_RADIOTAP, "RADIOTAP"},

  {0, NULL}

};

static const value_string channelcmds[] = {

  {0, "NONE"},

  {1, "SET HOP"},

  {2, "SET VECTOR"},

  {3, "SET CURRENT"},

  {4, "SET HOP/DWELL"},

  {0, NULL}

};

static int hf_kdsp_sentinel;

static int hf_kdsp_cmdnum;

static int hf_kdsp_length;

static int hf_kdsp_version;

static int hf_kdsp_server_version;

static int hf_kdsp_hostname;

static int hf_kdsp_str_flags;

static int hf_kdsp_str_len;

static int hf_kdsp_str_msg;

static int hf_kdsp_cpt_bitmap;

static int hf_kdsp_cpt_flag_cpt;

static int hf_kdsp_cpt_flag_fcs;

static int hf_kdsp_cpt_flag_gps;

static int hf_kdsp_cpt_flag_radio;

static int hf_kdsp_cpt_offset;

static int hf_kdsp_fcs;

static int hf_kdsp_fcs_data;

static int hf_kdsp_radio_hdr;

static int hf_kdsp_radio_hdr_len;

static int hf_kdsp_radio_content_bitmap;

static int hf_kdsp_radio_accuracy;

static int hf_kdsp_radio_freq_mhz;

static int hf_kdsp_radio_signal_dbm;

static int hf_kdsp_radio_noise_dbm;

static int hf_kdsp_radio_carrier;

static int hf_kdsp_radio_encoding;

static int hf_kdsp_radio_datarate;

static int hf_kdsp_radio_signal_rssi;

static int hf_kdsp_radio_noise_rssi;

static int hf_kdsp_gps_hdr;

static int hf_kdsp_gps_hdr_len;

static int hf_kdsp_gps_content_bitmap;

static int hf_kdsp_gps_fix;

static int hf_kdsp_gps_lat;

static int hf_kdsp_gps_lon;

static int hf_kdsp_gps_alt;

static int hf_kdsp_gps_spd;

static int hf_kdsp_gps_heading;

static int hf_kdsp_cpt_data_hdr;

static int hf_kdsp_cpt_data_hdr_len;

static int hf_kdsp_cpt_data_content_bitmap;

static int hf_kdsp_cpt_dc_flag_uuid;

static int hf_kdsp_cpt_dc_flag_len;

static int hf_kdsp_cpt_dc_flag_sec;

static int hf_kdsp_cpt_dc_flag_usec;

static int hf_kdsp_cpt_dc_flag_dlt;

static int hf_kdsp_cpt_uuid;

static int hf_kdsp_cpt_packet_len;

static int hf_kdsp_cpt_tv;

static int hf_kdsp_cpt_tv_sec;

static int hf_kdsp_cpt_tv_usec;

static int hf_kdsp_cpt_dlt;

static int hf_kdsp_ch_length;

static int hf_kdsp_ch_bitmap;

static int hf_kdsp_ch_flag_uuid;

static int hf_kdsp_ch_flag_cmd;

static int hf_kdsp_ch_flag_curch;

static int hf_kdsp_ch_flag_hop;

static int hf_kdsp_ch_flag_numch;

static int hf_kdsp_ch_flag_channels;

static int hf_kdsp_ch_flag_dwell;

static int hf_kdsp_ch_flag_rate;

static int hf_kdsp_ch_flag_hopdwell;

static int hf_kdsp_ch_uuid;

static int hf_kdsp_ch_cmd;

static int hf_kdsp_ch_cur_ch;

static int hf_kdsp_ch_hop;

static int hf_kdsp_ch_num_ch;

static int hf_kdsp_ch_data;

static int hf_kdsp_ch_ch;

static int hf_kdsp_ch_dwell;

static int hf_kdsp_ch_start;

static int hf_kdsp_ch_end;

static int hf_kdsp_ch_width;

static int hf_kdsp_ch_iter;

static int hf_kdsp_ch_rate;

static int hf_kdsp_ch_ch_dwell;

static int hf_kdsp_source_length;

static int hf_kdsp_source_bitmap;

static int hf_kdsp_source_uuid;

static int hf_kdsp_source_invalidate;

static int hf_kdsp_source_name;

static int hf_kdsp_source_interface;

static int hf_kdsp_source_type;

static int hf_kdsp_source_hop;

static int hf_kdsp_source_dwell;

static int hf_kdsp_source_rate;

static int hf_kdsp_report_hdr_len;

static int hf_kdsp_report_content_bitmap;

static int hf_kdsp_report_uuid;

static int hf_kdsp_report_flags;

static int hf_kdsp_report_hop_tm_sec;

static int hf_kdsp_report_hop_tm_usec;

static int ett_kdsp_pdu;

static int ett_cpt_bitmap;

static int ett_cpt_data_content_bitmap;

static int ett_cpt_tv;

static int ett_ch_bitmap;

static int ett_ch_data;

static int ett_sub_fcs;

static int ett_sub_radio;

static int ett_sub_gps;

static int ett_sub_cpt;

static expert_field ei_kdsp_payload_expected;

static expert_field ei_kdsp_payload_unexpected;

static expert_field ei_kdsp_cpt_data_hdr_len;

static expert_field ei_kdsp_cmdnum;

/* determine PDU length of protocol */

static unsigned

get_kdsp_message_len(packet_info *pinfo _U_, tvbuff_t *tvb,

                     int offset, void *data _U_)

{

  return tvb_get_ntohl(tvb, offset+8) + FRAME_HEADER_LEN; /* length is at offset 8 */

}

/* This method dissects fully reassembled messages */

static int

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

{

  uint32_t offset = 0;

  uint32_t command, length, numChan, bitmap, cptbitmap;

  uint32_t i, datalink_type=0, payload_len;

  uint16_t type, reported_payload_len=0, data_hdr_len, data_hdr_len_check;

  proto_item *kdsp_item, *sub_item, *subsub_item, *data_len_item, *command_item;

  proto_tree *kdsp_tree, *sub_tree, *subsub_tree;

  tvbuff_t   *payload_tvb;

  char* str_command;

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

  col_clear(pinfo->cinfo, COL_INFO);

  kdsp_item = proto_tree_add_item(tree, proto_kdsp, tvb, 0, -1, ENC_NA);

  kdsp_tree = proto_item_add_subtree(kdsp_item, ett_kdsp_pdu);

  proto_tree_add_item(kdsp_tree, hf_kdsp_sentinel, tvb, offset, 4, ENC_BIG_ENDIAN);

  offset += 4;

  command_item = proto_tree_add_item_ret_uint(kdsp_tree, hf_kdsp_cmdnum, tvb, offset, 4, ENC_BIG_ENDIAN, &command);

  offset += 4;

  str_command = val_to_str(pinfo->pool, command, packettypenames, "Unknown (0x%02x)");

  proto_item_append_text(kdsp_item, ", Command %s", str_command);

  col_add_fstr(pinfo->cinfo, COL_INFO, "Command %s; ", str_command);

  col_set_fence(pinfo->cinfo, COL_INFO);

  proto_tree_add_item_ret_uint(kdsp_tree, hf_kdsp_length, tvb, offset, 4, ENC_BIG_ENDIAN, &length);

  offset += 4;

  switch(command)

  {

  case CMD_NULL:

    break;

  case HELLO:

    proto_tree_add_item(kdsp_tree, hf_kdsp_version,  tvb, offset, 4, ENC_BIG_ENDIAN);

    offset +=4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_server_version,

                                                     tvb, offset, 32, ENC_ASCII);

    offset +=32;

    proto_tree_add_item(kdsp_tree, hf_kdsp_hostname, tvb, offset, 32, ENC_ASCII);

    /*offset +=32;*/

    break;

  case STRING:

    proto_tree_add_item(kdsp_tree, hf_kdsp_str_flags, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset +=4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_str_len,   tvb, offset, 4, ENC_BIG_ENDIAN);

    offset +=4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_str_msg,   tvb, offset, -1, ENC_ASCII);

    break;

  case CAPPACKET:

    sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_cpt_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

    sub_tree = proto_item_add_subtree(sub_item, ett_cpt_bitmap);

    proto_tree_add_item(sub_tree, hf_kdsp_cpt_flag_cpt,   tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_cpt_flag_fcs,   tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_cpt_flag_gps,   tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_cpt_flag_radio, tvb, offset, 4, ENC_BIG_ENDIAN);

    bitmap = tvb_get_ntohl(tvb, offset);

    offset +=4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_cpt_offset,    tvb, offset, 4, ENC_BIG_ENDIAN);

    offset +=4;

    if (bitmap & FCS_FLAG) {

      sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_fcs, tvb, offset, 4, ENC_NA);

      sub_tree = proto_item_add_subtree(sub_item, ett_sub_fcs);

      proto_tree_add_item(sub_tree, hf_kdsp_fcs_data,   tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

    }

    if (bitmap & RADIO_FLAG) {

      sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_radio_hdr, tvb, offset, 30, ENC_NA);

      sub_tree = proto_item_add_subtree(sub_item, ett_sub_radio);

      proto_tree_add_item(sub_tree, hf_kdsp_radio_hdr_len,        tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_content_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_accuracy,       tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_freq_mhz,       tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_signal_dbm,     tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_noise_dbm,      tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_carrier,        tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_encoding,       tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_datarate,       tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_signal_rssi,    tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_radio_noise_rssi,     tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

    }

    if (bitmap & GPS_FLAG) {

      sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_gps_hdr, tvb, offset, 68, ENC_NA);

      sub_tree = proto_item_add_subtree(sub_item, ett_sub_gps);

      proto_tree_add_item(sub_tree, hf_kdsp_gps_hdr_len, tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_content_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

      offset += 4;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_fix, tvb, offset, 2, ENC_BIG_ENDIAN);

      offset += 2;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_lat, tvb, offset, 12, ENC_NA);

      offset += 12;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_lon, tvb, offset, 12, ENC_NA);

      offset += 12;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_alt, tvb, offset, 12, ENC_NA);

      offset += 12;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_spd, tvb, offset, 12, ENC_NA);

      offset += 12;

      proto_tree_add_item(sub_tree, hf_kdsp_gps_heading, tvb, offset, 12, ENC_NA);

      offset += 12;

    }

    if (bitmap & CPT_FLAG) {

      sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_cpt_data_hdr, tvb, offset, 44, ENC_NA);

      sub_tree = proto_item_add_subtree(sub_item, ett_sub_cpt);

      data_len_item = proto_tree_add_item_ret_uint16(sub_tree, hf_kdsp_cpt_data_hdr_len, tvb, offset, 2, ENC_BIG_ENDIAN, &data_hdr_len);

      offset += 2;

      subsub_item = proto_tree_add_item(sub_tree, hf_kdsp_cpt_data_content_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

      subsub_tree = proto_item_add_subtree(subsub_item, ett_cpt_data_content_bitmap);

      proto_tree_add_item(subsub_tree, hf_kdsp_cpt_dc_flag_uuid, tvb, offset, 4, ENC_BIG_ENDIAN);

      proto_tree_add_item(subsub_tree, hf_kdsp_cpt_dc_flag_len,  tvb, offset, 4, ENC_BIG_ENDIAN);

      proto_tree_add_item(subsub_tree, hf_kdsp_cpt_dc_flag_sec,  tvb, offset, 4, ENC_BIG_ENDIAN);

      proto_tree_add_item(subsub_tree, hf_kdsp_cpt_dc_flag_usec, tvb, offset, 4, ENC_BIG_ENDIAN);

      proto_tree_add_item(subsub_tree, hf_kdsp_cpt_dc_flag_dlt,  tvb, offset, 4, ENC_BIG_ENDIAN);

      cptbitmap = tvb_get_ntohl(tvb, offset);

      offset += 4;

      data_hdr_len_check = 6; /* len(len) + len(bitmap) */

      if (cptbitmap & DATA_UUID_FLAG)    data_hdr_len_check += 16;

      if (cptbitmap & DATA_PACKLEN_FLAG) data_hdr_len_check +=  2;

      if (cptbitmap & DATA_TVSEC_FLAG)   data_hdr_len_check +=  8;

      if (cptbitmap & DATA_TVUSEC_FLAG)  data_hdr_len_check +=  8;

      if (cptbitmap & DATA_DLT_FLAG)     data_hdr_len_check +=  4;

      if (data_hdr_len_check != data_hdr_len) {

          expert_add_info(pinfo, data_len_item, &ei_kdsp_cpt_data_hdr_len);

      }

      if (cptbitmap & DATA_UUID_FLAG) {

        proto_tree_add_item(sub_tree, hf_kdsp_cpt_uuid,       tvb, offset, 16, ENC_NA);

        offset += 16;

      }

      if (cptbitmap & DATA_PACKLEN_FLAG) {

        proto_tree_add_item(sub_tree, hf_kdsp_cpt_packet_len, tvb, offset, 2, ENC_BIG_ENDIAN);

        reported_payload_len = tvb_get_ntohs(tvb, offset);

        offset += 2;

      }

      switch (cptbitmap & (DATA_TVSEC_FLAG | DATA_TVUSEC_FLAG)) {

      case DATA_TVSEC_FLAG | DATA_TVUSEC_FLAG:

        subsub_item = proto_tree_add_item(sub_tree, hf_kdsp_cpt_tv,         tvb, offset, 16, ENC_TIME_SECS_USECS|ENC_BIG_ENDIAN);

        break;

      case DATA_TVSEC_FLAG:

        subsub_item = proto_tree_add_item(sub_tree, hf_kdsp_cpt_tv,         tvb, offset, 8, ENC_TIME_SECS|ENC_BIG_ENDIAN);

        break;

      case DATA_TVUSEC_FLAG:

        subsub_item = proto_tree_add_item(sub_tree, hf_kdsp_cpt_tv,         tvb, offset, 8, ENC_TIME_USECS|ENC_BIG_ENDIAN);

        break;

      default:

        break;

      }

      subsub_tree = proto_item_add_subtree(subsub_item, ett_cpt_tv);

      if (cptbitmap & DATA_TVSEC_FLAG) {

        proto_tree_add_item(subsub_tree, hf_kdsp_cpt_tv_sec,  tvb, offset, 8, ENC_BIG_ENDIAN);

        offset += 8;

      }

      if (cptbitmap & DATA_TVUSEC_FLAG) {

        proto_tree_add_item(subsub_tree, hf_kdsp_cpt_tv_usec, tvb, offset, 8, ENC_BIG_ENDIAN);

        offset += 8;

      }

      if (cptbitmap & DATA_DLT_FLAG) {

        proto_tree_add_item(sub_tree, hf_kdsp_cpt_dlt,        tvb, offset, 4, ENC_BIG_ENDIAN);

        datalink_type = tvb_get_ntohl(tvb, offset);

        offset += 4;

      }

      payload_len = (length + FRAME_HEADER_LEN) - offset;

      if (cptbitmap & DATA_PACKLEN_FLAG) {

        payload_tvb = tvb_new_subset_length(tvb, offset, reported_payload_len);

        if (cptbitmap & DATA_DLT_FLAG) {

          dissector_try_uint(subdissector_dlt_table, datalink_type, payload_tvb, pinfo, tree);

          /* XXX - Restore protocol column */

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

        } else if (payload_len > 0) {

          proto_tree_add_expert(sub_tree, pinfo, &ei_kdsp_payload_expected, tvb, offset, payload_len);

        }

      } else if (payload_len > 0) {

        proto_tree_add_expert(sub_tree, pinfo, &ei_kdsp_payload_unexpected, tvb, offset, payload_len);

      }

    }

    break;

  case CHANNELSET:

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_length, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_ch_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

    sub_tree = proto_item_add_subtree(sub_item, ett_ch_bitmap);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_uuid,        tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_cmd,         tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_curch,       tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_hop,         tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_numch,       tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_channels,    tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_dwell,       tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_rate,        tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_hopdwell,    tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_uuid,            tvb, offset, 16, ENC_NA);

    offset += 16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_cmd,             tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_cur_ch,          tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_hop,             tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_num_ch,          tvb, offset, 2, ENC_BIG_ENDIAN);

    numChan = tvb_get_ntohs(tvb, offset);

    offset += 2;

    sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_ch_data, tvb, offset, 2046, ENC_NA);

    sub_tree = proto_item_add_subtree(sub_item, ett_ch_data);

    for(i = 0; i<numChan; i++) {

      type = tvb_get_ntohs(tvb, offset);

      type = type >> 15;

      if (!type) {/* Highest bit (1 << 15) == 0 if channel */

        proto_tree_add_item(sub_tree, hf_kdsp_ch_ch,    tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 2;

        proto_tree_add_item(sub_tree, hf_kdsp_ch_dwell, tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 6;

      }

      else{/* Highest bit (1 << 15) == 1 if range */

        proto_tree_add_item(sub_tree, hf_kdsp_ch_start, tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 2;

        proto_tree_add_item(sub_tree, hf_kdsp_ch_end,   tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 2;

        proto_tree_add_item(sub_tree, hf_kdsp_ch_width, tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 2;

        proto_tree_add_item(sub_tree, hf_kdsp_ch_iter,  tvb, offset, 2, ENC_BIG_ENDIAN);

        offset += 2;

      }

    }

    offset = length+FRAME_HEADER_LEN-4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_rate,     tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_ch_ch_dwell, tvb, offset, 2, ENC_BIG_ENDIAN);

    /*offset += 2;*/

    break;

  case SOURCE:

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_length,        tvb, offset, 2, ENC_BIG_ENDIAN);

    offset +=2;

    sub_item = proto_tree_add_item(kdsp_tree, hf_kdsp_ch_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

    sub_tree = proto_item_add_subtree(sub_item, ett_ch_bitmap);

    proto_tree_add_item(sub_tree, hf_kdsp_ch_flag_uuid,          tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_bitmap,        tvb, offset, 4, ENC_BIG_ENDIAN);

    offset +=4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_uuid,          tvb, offset, 16, ENC_NA);

    offset += 16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_invalidate,    tvb, offset, 2, ENC_BIG_ENDIAN);

    offset +=2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_name,          tvb, offset, 16, ENC_ASCII);

    offset +=16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_interface,     tvb, offset, 16, ENC_ASCII);

    offset += 16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_type,          tvb, offset, 16, ENC_ASCII);

    offset +=16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_hop,           tvb, offset, 1, ENC_BIG_ENDIAN);

    offset +=1;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_dwell,         tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_source_rate,          tvb, offset, 2, ENC_BIG_ENDIAN);

    /*offset += 2;*/

    break;

  case REPORT:

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_hdr_len,        tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_content_bitmap, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_uuid,           tvb, offset, 16, ENC_NA);

    offset += 16;

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_flags,          tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_hop_tm_sec,     tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    proto_tree_add_item(kdsp_tree, hf_kdsp_report_hop_tm_usec,    tvb, offset, 4, ENC_BIG_ENDIAN);

    /*offset += 4;*/

    break;

  default:

    expert_add_info(pinfo, command_item, &ei_kdsp_cmdnum);

  }

  return tvb_captured_length(tvb);

}

static int

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

{

  tcp_dissect_pdus(tvb, pinfo, tree, true, FRAME_HEADER_LEN,

                   get_kdsp_message_len, dissect_kdsp_message, data);

  return tvb_captured_length(tvb);

}

void

proto_register_kdsp(void)

{

  static hf_register_info hf[] = {

    { &hf_kdsp_sentinel,

      { "Sentinel", "kdsp.sentinel",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cmdnum,

      { "Command", "kdsp.command",

        FT_UINT32, BASE_DEC,

        VALS(packettypenames), 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_length,

      { "Length", "kdsp.length",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_version,

      { "KDSP Version", "kdsp.version",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_server_version,

      { "Server Version", "kdsp.server.version",

        FT_STRINGZTRUNC, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_hostname,

      { "Hostname", "kdsp.hostname",

        FT_STRINGZTRUNC, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_str_flags,

      { "String Flags", "kdsp.str.flags",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_str_len,

      { "String Length", "kdsp.str.length",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_str_msg,

      { "Message", "kdsp.str.message",

        FT_STRING, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_bitmap,

      { "Bitmap", "kdsp.cpt.bitmap",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_flag_cpt,

      { "Capture Packet Flag", "kdsp.cpt.flag.cpt",

        FT_BOOLEAN, 32,

        NULL, CPT_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_flag_fcs,

      { "Capture FCS Flag", "kdsp.cpt.flag.fcs",

        FT_BOOLEAN, 32,

        NULL, FCS_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_flag_gps,

      { "Capture GPS Flag", "kdsp.cpt.flag.gps",

        FT_BOOLEAN, 32,

        NULL, GPS_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_flag_radio,

      { "Capture Radio Flag", "kdsp.cpt.flag.radio",

        FT_BOOLEAN, 32,

        NULL, RADIO_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_offset,

      { "Offset Capture Packet Header", "kdsp.cpt.offset",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_fcs,

      { "Capture FCS Header", "kdsp.fcs",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_fcs_data,

      { "Frame Checksum", "kdsp.fcs.data",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_hdr,

      { "Capture Radio Header", "kdsp.radio",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_hdr_len,

      { "Length", "kdsp.radio.length",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_content_bitmap,

      { "Bitmap", "kdsp.radio.bitmap",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_accuracy,

      { "Accuracy", "kdsp.radio.accuracy",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_freq_mhz,

      { "Frequency", "kdsp.radio.freq",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_signal_dbm,

      { "Signal dbm", "kdsp.radio.signal_dbm",

        FT_INT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_noise_dbm,

      { "Noise dbm", "kdsp.radio.noise_dbm",

        FT_INT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_carrier,

      { "Carrier", "kdsp.radio.car",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_encoding,

      { "Encoding", "kdsp.radio.enc",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_datarate,

      { "Data Rate", "kdsp.radio.datarate",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_signal_rssi,

      { "Signal rssi", "kdsp.radio.signal_rssi",

        FT_INT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_radio_noise_rssi,

      { "Noise rssi", "kdsp.radio.noise_rssi",

        FT_INT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_hdr,

      { "Capture GPS Header", "kdsp.gps",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_hdr_len,

      { "GPS Length", "kdsp.gps.length",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_content_bitmap,

      { "Bitmap", "kdsp.gps.bitmap",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_fix,

      { "GPS fix", "kdsp.gps.fix",

        FT_UINT32, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_lat,

      { "Latitude", "kdsp.gps.lat",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_lon,

      { "Longitude", "kdsp.gps.lon",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_alt,

      { "Alt", "kdsp.gps.alt",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_spd,

      { "Spd", "kdsp.gps.spd",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_gps_heading,

      { "Heading", "kdsp.gps.heading",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_data_hdr,

      { "Capture Packet Header", "kdsp.cpt",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_data_hdr_len,

      { "Length", "kdsp.cpt.length",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_data_content_bitmap,

      { "Bitmap", "kdsp.cpt.bitmap",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dc_flag_uuid,

      { "Capture Content UUID Flag", "kdsp.cpt.cd.flag.uuid",

        FT_BOOLEAN, 32,

        NULL, DATA_UUID_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dc_flag_len,

      { "Capture Content Length Flag", "kdsp.cpt.cd.flag.len",

        FT_BOOLEAN, 32,

        NULL, DATA_PACKLEN_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dc_flag_sec,

      { "Capture Content Second Flag", "kdsp.cpt.cd.flag.sec",

        FT_BOOLEAN, 32,

        NULL, DATA_TVSEC_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dc_flag_usec,

      { "Capture Content Microsecond Flag", "kdsp.cpt.cd.flag.usec",

        FT_BOOLEAN, 32,

        NULL, DATA_TVUSEC_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dc_flag_dlt,

      { "Capture Content Datalink Type Flag", "kdsp.cpt.cd.flag.dlt",

        FT_BOOLEAN, 32,

        NULL, DATA_DLT_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_uuid,

      { "UUID", "kdsp.cpt.uuid",

        FT_BYTES, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_packet_len,

      { "Packet Length", "kdsp.cpt.pkt_len",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_tv,

      { "Packet Timeval", "kdsp.cpt.tv",

        FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_tv_sec,

      { "TV sec", "kdsp.cpt.tv_sec",

        FT_UINT64, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_tv_usec,

      { "TV usec", "kdsp.cpt.tv_usec",

        FT_UINT64, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_cpt_dlt,

      { "Data Link Type", "kdsp.cpt.dlt",

        FT_UINT32, BASE_DEC,

        VALS(payloadtypenames), 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_length,

      { "Length", "kdsp.chset.length",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_bitmap,

      { "Bitmap", "kdsp.chset.bitmap",

        FT_UINT32, BASE_HEX,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_uuid,

      { "UUID Flag", "kdsp.ch.flag.uuid",

        FT_BOOLEAN, 32,

        NULL, CH_UUID_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_cmd,

      { "Command Flag", "kdsp.ch.flag.cmd",

        FT_BOOLEAN, 32,

        NULL, CH_CMD_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_curch,

      { "Current Channel Flag", "kdsp.ch.flag.curch",

        FT_BOOLEAN, 32,

        NULL, CH_CURCH_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_hop,

      { "Hop Flag", "kdsp.ch.flag.hop",

        FT_BOOLEAN, 32,

        NULL, CH_HOP_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_numch,

      { "Num Channels Flag", "kdsp.ch.flag.numch",

        FT_BOOLEAN, 32,

        NULL, CH_NUMCH_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_channels,

      { "Channels Flag", "kdsp.ch.flag.channels",

        FT_BOOLEAN, 32,

        NULL, CH_CHANNELS_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_dwell,

      { "Dwell Flag", "kdsp.ch.flag.dwell",

        FT_BOOLEAN, 32,

        NULL, CH_DWELL_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_rate,

      { "Rate Flag", "kdsp.ch.flag.rate",

        FT_BOOLEAN, 32,

        NULL, CH_RATE_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_flag_hopdwell,

      { "Hop-Dwell Flag", "kdsp.ch.flag.hopdwell",

        FT_BOOLEAN, 32,

        NULL, CH_HOPDWELL_FLAG,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_uuid,

      { "UUID", "kdsp.chset.uuid",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_cmd,

      { "Command", "kdsp.chset.cmd",

        FT_UINT16, BASE_DEC,

        VALS(channelcmds), 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_cur_ch,

      { "Current Channel", "kdsp.chset.cur_ch",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_hop,

      { "Channel Hop", "kdsp.chset.hop",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_num_ch,

      { "Number of Channels", "kdsp.chset.num_ch",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_data,

      { "Channel Data", "kdsp.chset.data",

        FT_NONE, BASE_NONE,

        NULL, 0x0,

        NULL, HFILL }

    },

    { &hf_kdsp_ch_ch,

      { "Channel", "kdsp.chset.ch",

        FT_UINT16, BASE_DEC,

        NULL, 0x0,

        NULL, HFILL }

    },