145 lines
5.5 KiB
C
145 lines
5.5 KiB
C
/* packet-hipercontracer.c
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* Routines for the HiPerConTracer protocol
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* https://www.uni-due.de/~be0001/hipercontracer/
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*
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* Copyright 2021 by Thomas Dreibholz <dreibh [AT] simula.no>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from README.developer
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/ipproto.h>
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#include <epan/sctpppids.h>
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#include <epan/stat_tap_ui.h>
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void proto_register_hipercontracer(void);
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void proto_reg_handoff_hipercontracer(void);
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/* Initialize the protocol and registered fields */
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static int proto_hipercontracer = -1;
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/* Initialize the subtree pointers */
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static gint ett_hipercontracer = -1;
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static gint hf_magic_number = -1;
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static gint hf_send_ttl = -1;
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static gint hf_round = -1;
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static gint hf_checksum_tweak = -1;
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static gint hf_send_timestamp = -1;
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_magic_number, { "Magic Number", "hipercontracer.magic_number", FT_UINT32, BASE_HEX, NULL, 0x0, "An identifier chosen by the sender upon startup", HFILL } },
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{ &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 } },
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{ &hf_round, { "Round", "hipercontracer.round", FT_UINT8, BASE_DEC, NULL, 0x0, "The round number the packet belongs to", HFILL } },
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{ &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 } },
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{ &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 } }
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};
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static int
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heur_dissect_hipercontracer(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item* hipercontracer_item;
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proto_tree* hipercontracer_tree;
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guint64 timestamp;
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nstime_t t;
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// Check length
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const guint length = tvb_captured_length(message_tvb);
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if (length < 16)
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return FALSE;
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// Send TTL cannot be < 1
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const guint8 sendTTL = tvb_get_guint8(message_tvb, 4);
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if (sendTTL < 1)
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return FALSE;
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// Check for plausible send time stamp:
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// * After: 01.01.2016 00:00:00.000000
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// * Before: 31.12.2099 23:59.59.999999
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// Time stamp is microseconds since 29.09.1976 00:00:00.000000.
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const guint64 sendTimeStamp = tvb_get_ntoh64(message_tvb, 8) + G_GUINT64_CONSTANT(212803200000000);
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if ( (sendTimeStamp < G_GUINT64_CONSTANT(1451602800000000)) ||
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(sendTimeStamp > G_GUINT64_CONSTANT(4102441199999999)) )
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return FALSE;
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col_append_sep_fstr(pinfo->cinfo, COL_PROTOCOL, NULL, "HiPerConTracer");
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// Create the hipercontracer protocol tree
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hipercontracer_item = proto_tree_add_item(tree, proto_hipercontracer, message_tvb, 0, -1, ENC_NA);
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hipercontracer_tree = proto_item_add_subtree(hipercontracer_item, ett_hipercontracer);
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// Dissect the message
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proto_tree_add_item(hipercontracer_tree, hf_magic_number, message_tvb, 0, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(hipercontracer_tree, hf_send_ttl, message_tvb, 4, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(hipercontracer_tree, hf_round, message_tvb, 5, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(hipercontracer_tree, hf_checksum_tweak, message_tvb, 6, 2, ENC_BIG_ENDIAN);
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// Time stamp is microseconds since 29.09.1976 00:00:00.000000.
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timestamp = tvb_get_ntoh64(message_tvb, 8) + G_GUINT64_CONSTANT(212803200000000);
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t.secs = (time_t)(timestamp / 1000000);
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t.nsecs = (int)((timestamp - 1000000 * t.secs) * 1000);
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proto_tree_add_time(hipercontracer_tree, hf_send_timestamp, message_tvb, 8, 8, &t);
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col_append_fstr(pinfo->cinfo, COL_INFO, " (SendTTL=%u, Round=%u)",
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(unsigned int)tvb_get_guint8(message_tvb, 4),
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(unsigned int)tvb_get_guint8(message_tvb, 5));
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return tvb_reported_length(message_tvb);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_hipercontracer(void)
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{
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_hipercontracer
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};
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/* Register the protocol name and description */
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proto_hipercontracer = proto_register_protocol("HiPerConTracer Trace Service", "HiPerConTracer", "hipercontracer");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_hipercontracer, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_hipercontracer(void)
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{
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/* dissector_handle_t hipercontracer_handle;
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hipercontracer_handle =
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*/
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create_dissector_handle(heur_dissect_hipercontracer, proto_hipercontracer);
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/* Heuristic dissector for ICMP/ICMPv6 */
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heur_dissector_add("icmp", heur_dissect_hipercontracer, "HiPerConTracer over ICMP", "hipercontracer_icmp", proto_hipercontracer, HEURISTIC_ENABLE);
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heur_dissector_add("icmpv6", heur_dissect_hipercontracer, "HiPerConTracer over ICMPv6", "hipercontracer_icmpv6", proto_hipercontracer, HEURISTIC_ENABLE);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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