/* packet-ascend.c

 * Routines for decoding Lucent/Ascend packet traces

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include <wiretap/wtap.h>

void proto_register_ascend(void);

void proto_reg_handoff_ascend(void);

static int proto_ascend;

static int hf_link_type;

static int hf_session_id;

static int hf_called_number;

static int hf_chunk;

static int hf_task;

static int hf_user_name;

static int ett_raw;

static const value_string encaps_vals[] = {

  {ASCEND_PFX_WDS_X,  "PPP Transmit"               },

  {ASCEND_PFX_WDS_R,  "PPP Receive"                },

  {ASCEND_PFX_WDD,    "Ethernet triggering dialout"},

  {ASCEND_PFX_ISDN_X, "ISDN Transmit"              },

  {ASCEND_PFX_ISDN_R, "ISDN Receive"               },

  {ASCEND_PFX_ETHER,  "Ethernet"                   },

  {0,                  NULL                        }

};

static dissector_handle_t ascend_handle;

static dissector_handle_t eth_withoutfcs_handle;

static dissector_handle_t ppp_hdlc_handle;

static dissector_handle_t lapd_phdr_handle;

static int

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

{

  proto_tree                    *fh_tree;

  proto_item                    *ti, *hidden_item;

  union wtap_pseudo_header      *pseudo_header = pinfo->pseudo_header;

  struct isdn_phdr              isdn;

  /* load the top pane info. This should be overwritten by

     the next protocol in the stack */

  col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");

  col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A");

  col_set_str(pinfo->cinfo, COL_INFO, "Lucent/Ascend packet trace");

  /* If this is a transmitted or received PPP frame, set the PPP direction. */

  switch (pseudo_header->ascend.type) {

  case ASCEND_PFX_WDS_X:

    pinfo->p2p_dir = P2P_DIR_SENT;

    break;

  case ASCEND_PFX_WDS_R:

    pinfo->p2p_dir = P2P_DIR_RECV;

    break;

  }

  /* populate a tree in the second pane with the status of the link

     layer (ie none) */

  if(tree) {

    ti = proto_tree_add_protocol_format(tree, proto_ascend, tvb, 0, 0,

                                        "Lucent/Ascend packet trace");

    fh_tree = proto_item_add_subtree(ti, ett_raw);

    proto_tree_add_uint(fh_tree, hf_link_type, tvb, 0, 0,

                        pseudo_header->ascend.type);

    switch (pseudo_header->ascend.type) {

    case ASCEND_PFX_WDD:

      /* Ethernet packet forcing a call */

      proto_tree_add_string(fh_tree, hf_called_number, tvb, 0, 0,

                            pseudo_header->ascend.call_num);

      proto_tree_add_uint(fh_tree, hf_chunk, tvb, 0, 0,

                          pseudo_header->ascend.chunk);

      hidden_item = proto_tree_add_uint(fh_tree, hf_session_id, tvb, 0, 0, 0);

      proto_item_set_hidden(hidden_item);

      break;

    case ASCEND_PFX_WDS_X:

    case ASCEND_PFX_WDS_R:

      /* wandsession data */

      proto_tree_add_string(fh_tree, hf_user_name, tvb, 0, 0,

                            pseudo_header->ascend.user);

      proto_tree_add_uint(fh_tree, hf_session_id, tvb, 0, 0,

                          pseudo_header->ascend.sess);

      hidden_item = proto_tree_add_uint(fh_tree, hf_chunk, tvb, 0, 0, 0);

      proto_item_set_hidden(hidden_item);

      break;

    default:

      break;

    }

    proto_tree_add_uint(fh_tree, hf_task, tvb, 0, 0, pseudo_header->ascend.task);

  }

  switch (pseudo_header->ascend.type) {

    case ASCEND_PFX_WDS_X:

    case ASCEND_PFX_WDS_R:

      call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);

      break;

    case ASCEND_PFX_WDD:

    case ASCEND_PFX_ETHER:

      call_dissector(eth_withoutfcs_handle, tvb, pinfo, tree);

      break;

    case ASCEND_PFX_ISDN_X:

      isdn.uton = true;

      isdn.channel = 0;

      call_dissector_with_data(lapd_phdr_handle, tvb, pinfo, tree, &isdn);

      break;

    case ASCEND_PFX_ISDN_R:

      isdn.uton = false;

      isdn.channel = 0;

      call_dissector_with_data(lapd_phdr_handle, tvb, pinfo, tree, &isdn);

      break;

    default:

      break;

  }

  return tvb_captured_length(tvb);

}

void

proto_register_ascend(void)

{

  static hf_register_info hf[] = {

    { &hf_link_type,

      { "Link type",      "ascend.type",  FT_UINT32, BASE_DEC,    VALS(encaps_vals),      0x0,

        NULL, HFILL }},

    { &hf_session_id,

      { "Session ID",     "ascend.sess",  FT_UINT32, BASE_DEC,    NULL, 0x0,

        NULL, HFILL }},

    { &hf_called_number,

      { "Called number",  "ascend.number", FT_STRING, BASE_NONE,  NULL, 0x0,

        NULL, HFILL }},

    { &hf_chunk,

      { "WDD Chunk",      "ascend.chunk", FT_UINT32, BASE_HEX,    NULL, 0x0,

        NULL, HFILL }},

    { &hf_task,

      { "Task",           "ascend.task",  FT_UINT32, BASE_HEX,    NULL, 0x0,

        NULL, HFILL }},

    { &hf_user_name,

      { "User name",      "ascend.user",  FT_STRING, BASE_NONE,   NULL, 0x0,

        NULL, HFILL }},

  };

  static int *ett[] = {

    &ett_raw,

  };

  proto_ascend = proto_register_protocol("Lucent/Ascend debug output",

                                         "Lucent/Ascend", "ascend");

  proto_register_field_array(proto_ascend, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  ascend_handle = register_dissector("ascend", dissect_ascend, proto_ascend);

}

void

proto_reg_handoff_ascend(void)

{

  /*

   * Get handles for the Ethernet, PPP-in-HDLC-like-framing, and

   * LAPD-with-pseudoheader dissectors.

   */

  eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_ascend);

  ppp_hdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_ascend);

  lapd_phdr_handle = find_dissector_add_dependency("lapd-phdr", proto_ascend);

  dissector_add_uint("wtap_encap", WTAP_ENCAP_ASCEND, ascend_handle);

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local Variables:

 * c-basic-offset: 2

 * tab-width: 8

 * indent-tabs-mode: nil

 * End:

 *

 * ex: set shiftwidth=2 tabstop=8 expandtab:

 * :indentSize=2:tabSize=8:noTabs=true:

 */