/* packet-idp.c

 * Routines for XNS IDP

 * Based on the Netware IPX dissector by Gilbert Ramirez <gram@alumni.rice.edu>

 *

 * 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 "packet-idp.h"

#include <epan/etypes.h>

#include <epan/unit_strings.h>

void proto_register_idp(void);

void proto_reg_handoff_idp(void);

static dissector_handle_t idp_handle;

static int proto_idp;

static int hf_idp_checksum;

static int hf_idp_len;

/* static int hf_idp_src; */

/* static int hf_idp_dst; */

static int hf_idp_hops;

static int hf_idp_packet_type;

static int hf_idp_dnet;

static int hf_idp_dnode;

static int hf_idp_dsocket;

static int hf_idp_snet;

static int hf_idp_snode;

static int hf_idp_ssocket;

static int ett_idp;

static dissector_table_t idp_type_dissector_table;

/*

 * See

 *

 *  "Internet Transport Protocols", XSIS 028112, December 1981

 *

 * if you can find it; this is based on the headers in the BSD XNS

 * implementation.

 */

#define IDP_HEADER_LEN  30    /* It's *always* 30 bytes */

static const value_string idp_packet_type_vals[] = {

  { IDP_PACKET_TYPE_RIP,    "RIP" },

  { IDP_PACKET_TYPE_ECHO,   "Echo" },

  { IDP_PACKET_TYPE_ERROR,  "Error" },

  { IDP_PACKET_TYPE_PEP,    "PEP" },

  { IDP_PACKET_TYPE_SPP,    "SPP" },

  { IDP_PACKET_TYPE_PUPLOOKUP,    "PUPLookup"},

  { 0,        NULL }

};

static const value_string idp_socket_vals[] = {

  { IDP_SOCKET_RIP,               "RIP"},

  { IDP_SOCKET_ECHO,              "Echo"},

  { IDP_SOCKET_ERROR,             "Error"},

  { IDP_SOCKET_COURIER,           "Courier"},

  { IDP_SOCKET_TIME,              "Time"},

  { IDP_SOCKET_PUPLOOKUP,         "PUPLookup"},

  { IDP_SOCKET_SMB,   "SMB" },

  { 0,        NULL }

};

static int

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

{

  proto_tree  *idp_tree;

  proto_item  *ti;

  uint16_t    length;

  uint8_t   type;

  tvbuff_t  *next_tvb;

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

  col_clear(pinfo->cinfo, COL_INFO);

  ti = proto_tree_add_item(tree, proto_idp, tvb, 0, IDP_HEADER_LEN, ENC_NA);

  idp_tree = proto_item_add_subtree(ti, ett_idp);

  proto_tree_add_checksum(idp_tree, tvb, 0, hf_idp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);

  length = tvb_get_ntohs(tvb, 2);

  proto_tree_add_uint(idp_tree, hf_idp_len, tvb, 2, 2, length);

  /* Adjust the tvbuff length to include only the IDP datagram. */

  set_actual_length(tvb, length);

  proto_tree_add_item(idp_tree, hf_idp_hops, tvb, 4, 1, ENC_BIG_ENDIAN);

  type = tvb_get_uint8(tvb, 5);

  proto_tree_add_uint(idp_tree, hf_idp_packet_type, tvb, 5, 1, type);

  pinfo->ptype = PT_IDP;

  /* Destination */

  proto_tree_add_item(idp_tree, hf_idp_dnet, tvb, 6, 4, ENC_BIG_ENDIAN);

  proto_tree_add_item(idp_tree, hf_idp_dnode, tvb, 10, 6, ENC_NA);

  pinfo->destport = tvb_get_ntohs(tvb, 16);

  proto_tree_add_uint(idp_tree, hf_idp_dsocket, tvb, 16, 2,

      pinfo->destport);

  /* Source */

  proto_tree_add_item(idp_tree, hf_idp_snet, tvb, 18, 4, ENC_BIG_ENDIAN);

  proto_tree_add_item(idp_tree, hf_idp_snode, tvb, 22, 6, ENC_NA);

  pinfo->srcport = tvb_get_ntohs(tvb, 28);

  proto_tree_add_uint(idp_tree, hf_idp_ssocket, tvb, 28, 2,

      pinfo->srcport);

  /* Make the next tvbuff */

  next_tvb = tvb_new_subset_remaining(tvb, IDP_HEADER_LEN);

  /*

   * Hand off to the dissector for the packet type.

   */

  if (!dissector_try_uint(idp_type_dissector_table, type, next_tvb,

    pinfo, tree))

  {

    call_data_dissector(next_tvb, pinfo, tree);

  }

  return tvb_captured_length(tvb);

}

void

proto_register_idp(void)

{

  static hf_register_info hf_idp[] = {

    { &hf_idp_checksum,

        { "Checksum", "idp.checksum", FT_UINT16, BASE_HEX,

      NULL, 0x0, NULL, HFILL }},

#if 0

    { &hf_idp_src,

        { "Source Address", "idp.src", FT_STRING, BASE_NONE,

      NULL, 0x0, NULL, HFILL }},

#endif

#if 0

    { &hf_idp_dst,

        { "Destination Address",  "idp.dst", FT_STRING, BASE_NONE,

      NULL, 0x0,  NULL, HFILL }},

#endif

    { &hf_idp_len,

        { "Length",   "idp.len", FT_UINT16, BASE_DEC|BASE_UNIT_STRING,

      UNS(&units_byte_bytes), 0x0, NULL, HFILL }},

    /* XXX - does this have separate hop count and time subfields? */

    { &hf_idp_hops,

        { "Transport Control (Hops)", "idp.hops", FT_UINT8, BASE_DEC,

      NULL, 0x0, NULL, HFILL }},

    { &hf_idp_packet_type,

        { "Packet Type",  "idp.packet_type", FT_UINT8, BASE_DEC,

      VALS(idp_packet_type_vals), 0x0, NULL, HFILL }},

    { &hf_idp_dnet,

        { "Destination Network","idp.dst.net", FT_UINT32, BASE_HEX,

      NULL, 0x0, NULL, HFILL }},

    { &hf_idp_dnode,

        { "Destination Node", "idp.dst.node", FT_ETHER, BASE_NONE,

      NULL, 0x0, NULL, HFILL }},

    { &hf_idp_dsocket,

        { "Destination Socket", "idp.dst.socket", FT_UINT16, BASE_HEX,

      VALS(idp_socket_vals), 0x0, NULL, HFILL }},

    { &hf_idp_snet,

        { "Source Network","idp.src.net", FT_UINT32, BASE_HEX,

      NULL, 0x0, NULL, HFILL }},

    { &hf_idp_snode,

        { "Source Node",  "idp.src.node", FT_ETHER, BASE_NONE,

      NULL, 0x0, NULL, HFILL }},

    { &hf_idp_ssocket,

        { "Source Socket",  "idp.src.socket", FT_UINT16, BASE_HEX,

      VALS(idp_socket_vals), 0x0, NULL, HFILL }},

  };

  static int *ett[] = {

    &ett_idp,

  };

  proto_idp = proto_register_protocol("Internetwork Datagram Protocol",

      "IDP", "idp");

  proto_register_field_array(proto_idp, hf_idp, array_length(hf_idp));

  proto_register_subtree_array(ett, array_length(ett));

  idp_type_dissector_table = register_dissector_table("idp.packet_type",

      "IDP packet type", proto_idp, FT_UINT8, BASE_DEC);

  idp_handle = register_dissector("idp", dissect_idp, proto_idp);

}

void

proto_reg_handoff_idp(void)

{

  dissector_add_uint("ethertype", ETHERTYPE_XNS_IDP, idp_handle);

  dissector_add_uint("chdlc.protocol", ETHERTYPE_XNS_IDP, idp_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:

 */