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wireshark/epan/dissectors/packet-tsp.c

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/* packet-tsp.c
* Routines for Time Synchronization Protocol (TSP) packet dissection
*
* Uwe Girlich <Uwe.Girlich@philosys.de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-quake.c
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
/*
* For a full documentation of the Time Synchronization Protocol (TSP) see:
* http://docs.freebsd.org/44doc/smm/12.timed/paper.pdf
*/
void proto_register_tsp(void);
void proto_reg_handoff_tsp(void);
static int proto_tsp = -1;
static int hf_tsp_type = -1;
static int hf_tsp_vers = -1;
static int hf_tsp_seq = -1;
static int hf_tsp_hopcnt = -1;
static int hf_tsp_time_sec = -1;
static int hf_tsp_time_usec = -1;
static int hf_tsp_name = -1;
static gint ett_tsp = -1;
/* timed port from /etc/services */
#define UDP_PORT_TIMED 525
static const value_string names_tsp_type[] = {
#define TSP_ANY 0 /* match any types */
{ TSP_ANY, "any" },
#define TSP_ADJTIME 1 /* send adjtime */
{ TSP_ADJTIME, "adjtime" },
#define TSP_ACK 2 /* generic acknowledgement */
{ TSP_ACK, "ack" },
#define TSP_MASTERREQ 3 /* ask for master's name */
{ TSP_MASTERREQ, "masterreq" },
#define TSP_MASTERACK 4 /* acknowledge master request */
{ TSP_MASTERACK, "masterack" },
#define TSP_SETTIME 5 /* send network time */
{ TSP_SETTIME, "settime" },
#define TSP_MASTERUP 6 /* inform slaves that master is up */
{ TSP_MASTERUP, "masterup" },
#define TSP_SLAVEUP 7 /* slave is up but not polled */
{ TSP_SLAVEUP, "slaveup" },
#define TSP_ELECTION 8 /* advance candidature for master */
{ TSP_ELECTION, "election" },
#define TSP_ACCEPT 9 /* support candidature of master */
{ TSP_ACCEPT, "accept" },
#define TSP_REFUSE 10 /* reject candidature of master */
{ TSP_REFUSE, "refuse" },
#define TSP_CONFLICT 11 /* two or more masters present */
{ TSP_CONFLICT, "conflict" },
#define TSP_RESOLVE 12 /* masters' conflict resolution */
{ TSP_RESOLVE, "resolve" },
#define TSP_QUIT 13 /* reject candidature if master is up */
{ TSP_QUIT, "quit" },
#define TSP_DATE 14 /* reset the time (date command) */
{ TSP_DATE, "date" },
#define TSP_DATEREQ 15 /* remote request to reset the time */
{ TSP_DATEREQ, "datereq" },
#define TSP_DATEACK 16 /* acknowledge time setting */
{ TSP_DATEACK, "dateack" },
#define TSP_TRACEON 17 /* turn tracing on */
{ TSP_TRACEON, "traceon" },
#define TSP_TRACEOFF 18 /* turn tracing off */
{ TSP_TRACEOFF, "traceoff" },
#define TSP_MSITE 19 /* find out master's site */
{ TSP_MSITE, "msite" },
#define TSP_MSITEREQ 20 /* remote master's site request */
{ TSP_MSITEREQ, "msitereq" },
#define TSP_TEST 21 /* for testing election algo */
{ TSP_TEST, "test" },
#define TSP_SETDATE 22 /* New from date command */
{ TSP_SETDATE, "setdate" },
#define TSP_SETDATEREQ 23 /* New remote for above */
{ TSP_SETDATEREQ, "setdatereq" },
#define TSP_LOOP 24 /* loop detection packet */
{ TSP_LOOP, "loop" },
{ 0, NULL }
};
static int
dissect_tsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *tsp_tree;
proto_item *tsp_item;
guint8 tsp_type;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TSP");
col_clear(pinfo->cinfo, COL_INFO);
tsp_type = tvb_get_guint8(tvb, 0);
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(tsp_type, names_tsp_type, "Unknown message type (%u)"));
tsp_item = proto_tree_add_item(tree, proto_tsp,
tvb, 0, -1, ENC_NA);
tsp_tree = proto_item_add_subtree(tsp_item, ett_tsp);
if (tsp_tree) {
proto_tree_add_uint(tsp_tree, hf_tsp_type,
tvb, 0, 1, tsp_type);
proto_tree_add_item(tsp_tree, hf_tsp_vers,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tsp_tree, hf_tsp_seq,
tvb, 2, 2, ENC_BIG_ENDIAN);
}
switch (tsp_type) {
case TSP_LOOP:
if (tsp_tree)
proto_tree_add_item(tsp_tree, hf_tsp_hopcnt,
tvb, 4, 1, ENC_BIG_ENDIAN);
break;
case TSP_SETTIME:
case TSP_ADJTIME:
case TSP_SETDATE:
case TSP_SETDATEREQ:
if (tsp_tree) {
proto_tree_add_item(tsp_tree, hf_tsp_time_sec,
tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(tsp_tree, hf_tsp_time_usec,
tvb, 8, 4, ENC_BIG_ENDIAN);
}
break;
}
if (tsp_tree) {
proto_tree_add_item(tsp_tree, hf_tsp_name, tvb, 12,
-1, ENC_ASCII|ENC_NA);
}
return tvb_captured_length(tvb);
}
void
proto_reg_handoff_tsp(void)
{
dissector_handle_t tsp_handle;
tsp_handle = create_dissector_handle(dissect_tsp, proto_tsp);
dissector_add_uint_with_preference("udp.port", UDP_PORT_TIMED, tsp_handle);
}
void
proto_register_tsp(void)
{
static hf_register_info hf[] = {
{ &hf_tsp_type,
{ "Type", "tsp.type",
FT_UINT8, BASE_DEC, VALS(names_tsp_type), 0x0,
"Packet Type", HFILL }},
{ &hf_tsp_vers,
{ "Version", "tsp.version",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Protocol Version Number", HFILL }},
{ &hf_tsp_seq,
{ "Sequence", "tsp.sequence",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Sequence Number", HFILL }},
{ &hf_tsp_hopcnt,
{ "Hop Count", "tsp.hopcnt",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_tsp_time_sec,
{ "Seconds", "tsp.sec",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_tsp_time_usec,
{ "Microseconds", "tsp.usec",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_tsp_name,
{ "Machine Name", "tsp.name",
FT_STRINGZ, BASE_NONE, NULL, 0x0,
"Sender Machine Name", HFILL }}
};
static gint *ett[] = {
&ett_tsp
};
proto_tsp = proto_register_protocol("Time Synchronization Protocol",
"TSP", "tsp");
proto_register_field_array(proto_tsp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/*
* 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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