/* packet-hbbak.c

 * Routines for ethertype 0x8988 Paloalto heartbeat backup traffic via mgmt

 *

 * Copyright 2020 Joerg Mayer (see AUTHORS file)

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

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

 */

/* 2do:

 * - Find out the meaning of the 6 bytes header: timestamp?

 * - Handle trailer bytes correctly

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/etypes.h>

void proto_reg_handoff_hbbak(void);

void proto_register_hbbak(void);

#define PROTO_SHORT_NAME "PA-HB-Bak"

#define PROTO_LONG_NAME "Palo Alto Heartbeat Backup"

#define HBBAK_SIZE 8

static int proto_hbbak;

static int hf_hbbak_unknown1;

static int hf_hbbak_etype_outer;

static int hf_hbbak_trailer;

static int ett_hbbak;

static dissector_handle_t hbbak_handle;

static dissector_handle_t ethertype_handle;

static int

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

{

  proto_tree *ti, *hbbak_tree;

  int offset = 0;

  uint16_t eth_type_outer;

  ethertype_data_t ethertype_data;

  col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);

  col_clear(pinfo->cinfo, COL_INFO);

  col_add_fstr(pinfo->cinfo, COL_INFO, PROTO_LONG_NAME);

  hbbak_tree = NULL;

  ti = proto_tree_add_item(tree, proto_hbbak, tvb, offset, HBBAK_SIZE, ENC_NA);

  hbbak_tree = proto_item_add_subtree(ti, ett_hbbak);

  proto_tree_add_item(hbbak_tree, hf_hbbak_unknown1, tvb, offset, 6, ENC_NA);

  offset += 6;

  eth_type_outer = tvb_get_ntohs(tvb, offset);

  proto_tree_add_uint(hbbak_tree, hf_hbbak_etype_outer, tvb,

          offset, 2, eth_type_outer);

  ethertype_data.etype = eth_type_outer;

  ethertype_data.payload_offset = HBBAK_SIZE;

  ethertype_data.fh_tree = hbbak_tree;

  ethertype_data.trailer_id = hf_hbbak_trailer;

  ethertype_data.fcs_len = 0;

  call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);

  return tvb_captured_length(tvb);

}

void

proto_register_hbbak(void)

{

  static hf_register_info hf[] = {

    { &hf_hbbak_unknown1,

    { "Unknown1", "hbbak.unknown1", FT_BYTES, BASE_NONE, NULL,

      0x0, NULL, HFILL }},

    { &hf_hbbak_etype_outer,

    { "Type", "hbbak.etype", FT_UINT16, BASE_HEX, VALS(etype_vals),

      0x0, NULL, HFILL }},

    { &hf_hbbak_trailer,

    { "Trailer", "hbbak.trailer", FT_BYTES, BASE_NONE, NULL,

      0x0, NULL, HFILL }},

  };

  static int *ett[] = {

    &ett_hbbak,

  };

  proto_hbbak = proto_register_protocol(PROTO_LONG_NAME, PROTO_LONG_NAME, "hbbak");

  proto_register_field_array(proto_hbbak, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  hbbak_handle = register_dissector("hbbak", dissect_hbbak, proto_hbbak);

}

void

proto_reg_handoff_hbbak(void)

{

  ethertype_handle = find_dissector_add_dependency("ethertype", proto_hbbak);

  dissector_add_uint("ethertype", ETHERTYPE_PA_HBBACKUP, hbbak_handle);

}

/*

 * 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:

 */