/* packet-nt-tpcp.c

 * Routines for Transparent Proxy Cache Protocol packet disassembly

 * (c) Copyright Giles Scott <giles.scott1 [AT] btinternet.com>

 *

 * 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/addr_resolv.h> /* this is for get_hostname and udp_port_to_display */

#include <epan/tfs.h>

#include <wsutil/array.h>

void proto_register_tpcp(void);

void proto_reg_handoff_tpcp(void);

static dissector_handle_t tpcp_handle;

#define UDP_PORT_TPCP   3121 /* Not IANA registered */

/* TPCP version1/2 PDU format */

typedef struct _tpcppdu_t {

  uint8_t version;     /* PDU version 1 */

  uint8_t type;      /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem  filter */

                       /* Version 2 adds 5=add session 6= remove session */

  uint16_t  flags;       /* 0x0001: 0=UDP, 1=TCP*/

                       /* 0x0002: 0=NONE, 1=DONT_REDIRECT */

                       /* 0x0004: 0=NONE, 1=Xon */

                       /* 0x0008: 0=NONE, 1=Xoff */

  uint16_t  id;      /* request/response identification or TTL */

  uint16_t  cport;       /* client UDP or TCP port number */

  uint32_t  caddr;       /* client IPv4 address */

  uint32_t  saddr;       /* server IPV4 address */

  /* tpcp version 2 only*/

  uint32_t vaddr;      /* Virtual Server IPv4 address */

  uint32_t rasaddr;     /* RAS server IPv4 address */

  uint32_t signature;   /* 0x74706370 - tpcp */

} tpcpdu_t;

static const value_string type_vals[] = {

  { 1, "Request" },

  { 2, "Reply" },

  { 3, "Add Filter" },

  { 4, "Remove Filter" },

  /* 5 and 6 are for version 2 only */

  { 5, "Add Session" },

  { 6, "Remove Session" },

  { 0,  NULL }

};

/* TPCP Flags */

#define TF_TPCP_UDPTCP       0x01

#define TF_TPCP_DONTREDIRECT 0x02

#define TF_TPCP_XON          0x04

#define TF_TPCP_XOFF         0x08

/* Version info */

#define TPCP_VER_1 1

#define TPCP_VER_2 2

#define TPCP_VER_1_LENGTH 16

#define TPCP_VER_2_LENGTH 28

/* things we can do filters on */

static int hf_tpcp_version;

static int hf_tpcp_type;

static int hf_tpcp_flags;

static int hf_tpcp_flags_tcp;

static int hf_tpcp_flags_redir;

static int hf_tpcp_flags_xon;

static int hf_tpcp_flags_xoff;

static int hf_tpcp_id;

static int hf_tpcp_cport;

static int hf_tpcp_caddr;

static int hf_tpcp_saddr;

static int hf_tpcp_vaddr;

static int hf_tpcp_rasaddr;

static int hf_tpcp_signature;

static int proto_tpcp;

static int ett_tpcp;

static int ett_tpcp_flags;

static int

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

{

  proto_tree *tpcp_tree = NULL;

  proto_item *ti;

  uint8_t version, type;

  uint16_t  id, cport;

  static int * const tpcp_flags[] = {

    &hf_tpcp_flags_tcp,

    &hf_tpcp_flags_redir,

    &hf_tpcp_flags_xon,

    &hf_tpcp_flags_xoff,

    NULL

    };

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

  col_clear(pinfo->cinfo, COL_INFO);

  /* need to find out which version!! */

  version = tvb_get_uint8(tvb, 0);

  if ((version != TPCP_VER_1) && (version != TPCP_VER_2)) {

    /* Not us */

    return 0;

  }

  ti = proto_tree_add_protocol_format(tree, proto_tpcp, tvb, 0, -1,

              "Alteon WebSystems - Transparent Proxy Cache Protocol");

  tpcp_tree = proto_item_add_subtree(ti, ett_tpcp);

  proto_tree_add_item(tpcp_tree, hf_tpcp_version, tvb, 0, 1, ENC_BIG_ENDIAN);

  type = tvb_get_uint8(tvb, 1);

  proto_tree_add_item(tpcp_tree, hf_tpcp_type, tvb, 1, 1, ENC_BIG_ENDIAN);

  proto_tree_add_bitmask(tpcp_tree, tvb, 2, hf_tpcp_flags, ett_tpcp_flags, tpcp_flags, ENC_NA);

  /* N.B., flags are 8 bits, so byte at offset 3 skipped.. */

  id = tvb_get_ntohs(tvb, 4);

  proto_tree_add_item(tpcp_tree, hf_tpcp_id, tvb, 4, 2, ENC_BIG_ENDIAN);

  cport = tvb_get_ntohs(tvb, 6);

  proto_tree_add_uint_format_value(tpcp_tree, hf_tpcp_cport, tvb, 6, 2, cport,

           "%s", udp_port_to_display(pinfo->pool, cport));

  proto_tree_add_item(tpcp_tree, hf_tpcp_caddr, tvb, 8, 4, ENC_BIG_ENDIAN);

  proto_tree_add_item(tpcp_tree, hf_tpcp_saddr, tvb, 12, 4, ENC_BIG_ENDIAN);

  if (version == TPCP_VER_2) {

    proto_tree_add_item(tpcp_tree, hf_tpcp_vaddr, tvb, 16, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(tpcp_tree, hf_tpcp_rasaddr, tvb, 20, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(tpcp_tree, hf_tpcp_signature, tvb, 24, 4, ENC_BIG_ENDIAN);

  }

  col_add_fstr(pinfo->cinfo, COL_INFO,"%s id %d CPort %s CIP %s SIP %s",

      val_to_str_const(type, type_vals, "Unknown"),

      id,

      udp_port_to_display(pinfo->pool, cport),

      tvb_ip_to_str(pinfo->pool, tvb, 8),

      tvb_ip_to_str(pinfo->pool, tvb, 12));

  if (version == TPCP_VER_1)

    return TPCP_VER_1_LENGTH;

  return TPCP_VER_2_LENGTH;

}

void

proto_register_tpcp(void)

{

  static hf_register_info hf[] = {

    { &hf_tpcp_version,

    { "Version",    "tpcp.version", FT_UINT8, BASE_DEC, NULL, 0x0,

    "TPCP version", HFILL }},

    { &hf_tpcp_type,

    { "Type",   "tpcp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,

    "PDU type", HFILL }},

    { &hf_tpcp_flags,

    { "Flags",    "tpcp.flags", FT_UINT16, BASE_HEX, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_flags_tcp,

    { "UDP/TCP",    "tpcp.flags.tcp", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_UDPTCP,

    "Protocol type", HFILL }},

    { &hf_tpcp_flags_redir,

    { "No Redirect",  "tpcp.flags.redir", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_DONTREDIRECT,

    "Don't redirect client", HFILL }},

    { &hf_tpcp_flags_xon,

    { "XON",    "tpcp.flags.xon", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XON,

    NULL, HFILL }},

    { &hf_tpcp_flags_xoff,

    { "XOFF",   "tpcp.flags.xoff", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XOFF,

    NULL, HFILL }},

    { &hf_tpcp_id,

    { "Client indent",  "tpcp.cid", FT_UINT16, BASE_DEC, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_cport,

    { "Client Source Port", "tpcp.cport", FT_UINT16, BASE_DEC, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_caddr,

    { "Client Source IP address", "tpcp.caddr", FT_IPv4, BASE_NONE, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_saddr,

    { "Server IP address",  "tpcp.saddr", FT_IPv4, BASE_NONE, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_vaddr,

    { "Virtual Server IP address", "tpcp.vaddr", FT_IPv4, BASE_NONE, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_rasaddr,

    { "RAS server IP address", "tpcp.rasaddr", FT_IPv4, BASE_NONE, NULL, 0x0,

    NULL, HFILL }},

    { &hf_tpcp_signature,

    { "Signature",  "tpcp.signature", FT_UINT32, BASE_DEC, NULL, 0x0,

    NULL, HFILL }},

  };

  static int *ett[] = {

    &ett_tpcp,

    &ett_tpcp_flags,

  };

  proto_tpcp = proto_register_protocol("Alteon - Transparent Proxy Cache Protocol", "TPCP", "tpcp");

  proto_register_field_array(proto_tpcp, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  tpcp_handle = register_dissector("tpcp", dissect_tpcp, proto_tpcp);

}

void

proto_reg_handoff_tpcp(void)

{

  dissector_add_uint_with_preference("udp.port", UDP_PORT_TPCP, tpcp_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:

 */