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/* packet-hipercontracer.c
* Routines for the HiPerConTracer protocol
* https://www.uni-due.de/~be0001/hipercontracer/
*
* Copyright 2021 by Thomas Dreibholz <dreibh [AT] simula.no>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from README.developer
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/ipproto.h>
#include <epan/sctpppids.h>
#include <epan/stat_tap_ui.h>
void proto_register_hipercontracer(void);
void proto_reg_handoff_hipercontracer(void);
/* Initialize the protocol and registered fields */
static int proto_hipercontracer;
/* Initialize the subtree pointers */
static int ett_hipercontracer;
static int hf_magic_number;
static int hf_send_ttl;
static int hf_round;
static int hf_checksum_tweak;
static int hf_seq_number;
static int hf_send_timestamp;
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_magic_number, { "Magic Number", "hipercontracer.magic_number", FT_UINT32, BASE_HEX, NULL, 0x0, "An identifier chosen by the sender upon startup", HFILL } },
{ &hf_send_ttl, { "Send TTL", "hipercontracer.send_ttl", FT_UINT8, BASE_DEC, NULL, 0x0, "The IP TTL/IPv6 Hop Count used by the sender", HFILL } },
{ &hf_round, { "Round", "hipercontracer.round", FT_UINT8, BASE_DEC, NULL, 0x0, "The round number the packet belongs to", HFILL } },
{ &hf_checksum_tweak, { "Checksum Tweak", "hipercontracer.checksum_tweak", FT_UINT16, BASE_HEX, NULL, 0x0, "A 16-bit value to ensure a given checksum for the ICMP/ICMPv6 message", HFILL } },
{ &hf_seq_number, { "Sequence Number", "hipercontracer.seq_number", FT_UINT16, BASE_DEC, NULL, 0x0, "A 16-bit sequence number", HFILL } },
{ &hf_send_timestamp, { "Send Time Stamp", "hipercontracer.send_timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0x0, "The send time stamp (microseconds since September 29, 1976, 00:00:00)", HFILL } }
};
static int
heur_dissect_hipercontracer(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item* hipercontracer_item;
proto_tree* hipercontracer_tree;
uint64_t timestamp;
nstime_t t;
// Check length
const unsigned length = tvb_captured_length(message_tvb);
if (length < 16)
return false;
const uint32_t magic = tvb_get_ntohl(message_tvb, 0);
// Send TTL cannot be < 1
const uint8_t sendTTL = tvb_get_uint8(message_tvb, 4);
if (sendTTL < 1)
return false;
const uint8_t round = tvb_get_uint8(message_tvb, 5);
const uint16_t checksumTweak = tvb_get_ntohs(message_tvb, 6);
uint64_t sendTimeStamp = tvb_get_ntoh64(message_tvb, 8);
/*
* Don't dissect a SASL ldap message, which starts with the
* first 12 bytes like this:
*
* Length: 00000091 (very, very unlikely larger than 24bits).
* Magic: 0504 (KRB_TOKEN_CFX_WRAP)
* Flags: 04 (0x01, 0x02, 0x04 are defined)
* Filler: ff
* EC: 000c
* RRC: 0000 or 000c
*/
if ((magic & 0xff000000) == 0 &&
(magic & 0x00ffffff) != 0 &&
sendTTL == 0x05 &&
round == 0x04 &&
(checksumTweak & 0xf8ff) == 0x00ff &&
(sendTimeStamp & UINT64_C(0xff00ff0000000000)) == 0)
return false;
// Check for plausible send time stamp:
// * After: 01.01.2016 00:00:00.000000
// * Before: 31.12.2099 23:59.59.999999
// Time stamp is microseconds since 29.09.1976 00:00:00.000000.
sendTimeStamp += UINT64_C(212803200000000);
if ( (sendTimeStamp < UINT64_C(1451602800000000)) ||
(sendTimeStamp > UINT64_C(4102441199999999)) )
return false;
col_append_sep_fstr(pinfo->cinfo, COL_PROTOCOL, NULL, "HiPerConTracer");
// Create the HiPerConTracer protocol tree
hipercontracer_item = proto_tree_add_item(tree, proto_hipercontracer, message_tvb, 0, -1, ENC_NA);
hipercontracer_tree = proto_item_add_subtree(hipercontracer_item, ett_hipercontracer);
// Dissect the message
proto_tree_add_item(hipercontracer_tree, hf_magic_number, message_tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(hipercontracer_tree, hf_send_ttl, message_tvb, 4, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(hipercontracer_tree, hf_round, message_tvb, 5, 1, ENC_BIG_ENDIAN);
if (pinfo->ptype == PT_NONE) {
// ICMP or ICMPv6 do not have ports -> Checksum Tweak field
proto_tree_add_item(hipercontracer_tree, hf_checksum_tweak, message_tvb, 6, 2, ENC_BIG_ENDIAN);
}
else {
// Otherwise, there are ports -> Sequence Number field
proto_tree_add_item(hipercontracer_tree, hf_seq_number, message_tvb, 6, 2, ENC_BIG_ENDIAN);
}
// Time stamp is microseconds since 29.09.1976 00:00:00.000000.
timestamp = tvb_get_ntoh64(message_tvb, 8) + UINT64_C(212803200000000);
t.secs = (time_t)(timestamp / 1000000);
t.nsecs = (int)((timestamp - 1000000 * t.secs) * 1000);
proto_tree_add_time(hipercontracer_tree, hf_send_timestamp, message_tvb, 8, 8, &t);
col_append_fstr(pinfo->cinfo, COL_INFO, " (SendTTL=%u, Round=%u)",
(unsigned int)tvb_get_uint8(message_tvb, 4),
(unsigned int)tvb_get_uint8(message_tvb, 5));
return tvb_reported_length(message_tvb);
}
static bool
heur_dissect_hipercontracer_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
return heur_dissect_hipercontracer(tvb, pinfo, tree, data) > 0;
}
/* Register the protocol with Wireshark */
void
proto_register_hipercontracer(void)
{
/* Setup protocol subtree array */
static int *ett[] = {
&ett_hipercontracer
};
/* Register the protocol name and description */
proto_hipercontracer = proto_register_protocol("HiPerConTracer Trace Service", "HiPerConTracer", "hipercontracer");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_hipercontracer, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("hipercontracer", heur_dissect_hipercontracer, proto_hipercontracer);
}
void
proto_reg_handoff_hipercontracer(void)
{
/* Heuristic dissector for ICMP/ICMPv6 */
heur_dissector_add("icmp", heur_dissect_hipercontracer_heur, "HiPerConTracer over ICMP", "hipercontracer_icmp", proto_hipercontracer, HEURISTIC_ENABLE);
heur_dissector_add("icmpv6", heur_dissect_hipercontracer_heur, "HiPerConTracer over ICMPv6", "hipercontracer_icmpv6", proto_hipercontracer, HEURISTIC_ENABLE);
heur_dissector_add("udp", heur_dissect_hipercontracer_heur, "HiPerConTracer over UDP", "hipercontracer_udp", proto_hipercontracer, HEURISTIC_ENABLE);
heur_dissector_add("tcp", heur_dissect_hipercontracer_heur, "HiPerConTracer over TCP", "hipercontracer_tcp", proto_hipercontracer, HEURISTIC_ENABLE);
}
/*
* Editor modelines
*
* 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:
*/
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