1/*
2 * Copyright (c) 2000 Ben Smithurst <ben@scientia.demon.co.uk>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#define NETDISSECT_REWORKED
23#ifdef HAVE_CONFIG_H
24#include "config.h"
25#endif
26
27#include <tcpdump-stdinc.h>
28
29#include "interface.h"
30#include "extract.h"
31
32/*
33 * Time Synchronization Protocol
34 */
35
36struct tsp_timeval {
37	uint32_t	tv_sec;
38	uint32_t	tv_usec;
39};
40
41struct tsp {
42	uint8_t		tsp_type;
43	uint8_t		tsp_vers;
44	uint16_t	tsp_seq;
45	union {
46		struct tsp_timeval tspu_time;
47		int8_t tspu_hopcnt;
48	} tsp_u;
49	int8_t tsp_name[256];
50};
51
52#define	tsp_time	tsp_u.tspu_time
53#define	tsp_hopcnt	tsp_u.tspu_hopcnt
54
55/*
56 * Command types.
57 */
58#define	TSP_ANY			0	/* match any types */
59#define	TSP_ADJTIME		1	/* send adjtime */
60#define	TSP_ACK			2	/* generic acknowledgement */
61#define	TSP_MASTERREQ		3	/* ask for master's name */
62#define	TSP_MASTERACK		4	/* acknowledge master request */
63#define	TSP_SETTIME		5	/* send network time */
64#define	TSP_MASTERUP		6	/* inform slaves that master is up */
65#define	TSP_SLAVEUP		7	/* slave is up but not polled */
66#define	TSP_ELECTION		8	/* advance candidature for master */
67#define	TSP_ACCEPT		9	/* support candidature of master */
68#define	TSP_REFUSE		10	/* reject candidature of master */
69#define	TSP_CONFLICT		11	/* two or more masters present */
70#define	TSP_RESOLVE		12	/* masters' conflict resolution */
71#define	TSP_QUIT		13	/* reject candidature if master is up */
72#define	TSP_DATE		14	/* reset the time (date command) */
73#define	TSP_DATEREQ		15	/* remote request to reset the time */
74#define	TSP_DATEACK		16	/* acknowledge time setting  */
75#define	TSP_TRACEON		17	/* turn tracing on */
76#define	TSP_TRACEOFF		18	/* turn tracing off */
77#define	TSP_MSITE		19	/* find out master's site */
78#define	TSP_MSITEREQ		20	/* remote master's site request */
79#define	TSP_TEST		21	/* for testing election algo */
80#define	TSP_SETDATE		22	/* New from date command */
81#define	TSP_SETDATEREQ		23	/* New remote for above */
82#define	TSP_LOOP		24	/* loop detection packet */
83
84#define	TSPTYPENUMBER		25
85
86static const char tstr[] = "[|timed]";
87
88static const char *tsptype[TSPTYPENUMBER] =
89  { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP",
90  "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT",
91  "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ",
92  "TEST", "SETDATE", "SETDATEREQ", "LOOP" };
93
94void
95timed_print(netdissect_options *ndo,
96            register const u_char *bp)
97{
98	struct tsp *tsp = (struct tsp *)bp;
99	long sec, usec;
100
101	ND_TCHECK(tsp->tsp_type);
102	if (tsp->tsp_type < TSPTYPENUMBER)
103		ND_PRINT((ndo, "TSP_%s", tsptype[tsp->tsp_type]));
104	else
105		ND_PRINT((ndo, "(tsp_type %#x)", tsp->tsp_type));
106
107	ND_TCHECK(tsp->tsp_vers);
108	ND_PRINT((ndo, " vers %u", tsp->tsp_vers));
109
110	ND_TCHECK(tsp->tsp_seq);
111	ND_PRINT((ndo, " seq %u", tsp->tsp_seq));
112
113	switch (tsp->tsp_type) {
114	case TSP_LOOP:
115		ND_TCHECK(tsp->tsp_hopcnt);
116		ND_PRINT((ndo, " hopcnt %u", tsp->tsp_hopcnt));
117		break;
118	case TSP_SETTIME:
119	case TSP_ADJTIME:
120	case TSP_SETDATE:
121	case TSP_SETDATEREQ:
122		ND_TCHECK(tsp->tsp_time);
123		sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
124		usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
125		/* XXX The comparison below is always false? */
126		if (usec < 0)
127			/* corrupt, skip the rest of the packet */
128			return;
129		ND_PRINT((ndo, " time "));
130		if (sec < 0 && usec != 0) {
131			sec++;
132			if (sec == 0)
133				ND_PRINT((ndo, "-"));
134			usec = 1000000 - usec;
135		}
136		ND_PRINT((ndo, "%ld.%06ld", sec, usec));
137		break;
138	}
139	ND_TCHECK(tsp->tsp_name);
140	ND_PRINT((ndo, " name "));
141	if (fn_print(ndo, (u_char *)tsp->tsp_name, (u_char *)tsp->tsp_name + sizeof(tsp->tsp_name)))
142		goto trunc;
143	return;
144
145trunc:
146	ND_PRINT((ndo, " %s", tstr));
147}
148