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/* 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 */
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 {
guint8 version; /* PDU version 1 */
guint8 type; /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem filter */
/* Version 2 adds 5=add session 6= remove session */
guint16 flags; /* 0x0001: 0=UDP, 1=TCP*/
/* 0x0002: 0=NONE, 1=DONT_REDIRECT */
/* 0x0004: 0=NONE, 1=Xon */
/* 0x0008: 0=NONE, 1=Xoff */
guint16 id; /* request/response identification or TTL */
guint16 cport; /* client UDP or TCP port number */
guint32 caddr; /* client IPv4 address */
guint32 saddr; /* server IPV4 address */
/* tpcp version 2 only*/
guint32 vaddr; /* Virtual Server IPv4 address */
guint32 rasaddr; /* RAS server IPv4 address */
guint32 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 0x0001
#define TF_TPCP_DONTREDIRECT 0x0002
#define TF_TPCP_XON 0x0004
#define TF_TPCP_XOFF 0x0008
/* 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 = -1;
static int hf_tpcp_type = -1;
static int hf_tpcp_flags = -1;
static int hf_tpcp_flags_tcp = -1;
static int hf_tpcp_flags_redir = -1;
static int hf_tpcp_flags_xon = -1;
static int hf_tpcp_flags_xoff = -1;
static int hf_tpcp_id = -1;
static int hf_tpcp_cport = -1;
static int hf_tpcp_caddr = -1;
static int hf_tpcp_saddr = -1;
static int hf_tpcp_vaddr = -1;
static int hf_tpcp_rasaddr = -1;
static int hf_tpcp_signature = -1;
static int proto_tpcp = -1;
static gint ett_tpcp = -1;
static gint ett_tpcp_flags = -1;
static int
dissect_tpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *tpcp_tree = NULL;
proto_item *ti;
guint8 version, type;
guint16 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_guint8(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_guint8(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);
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 gint *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:
*/
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