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/* \summary: Berkeley UNIX Time Synchronization Protocol */
23
24/* specification: https://docs.freebsd.org/44doc/smm/12.timed/paper.pdf */
25
26#ifdef HAVE_CONFIG_H
27#include <config.h>
28#endif
29
30#include "netdissect-stdinc.h"
31
32#include "netdissect.h"
33#include "extract.h"
34
35struct tsp_timeval {
36	nd_int32_t	tv_sec;
37	nd_int32_t	tv_usec;
38};
39
40struct tsp {
41	nd_uint8_t	tsp_type;
42	nd_uint8_t	tsp_vers;
43	nd_uint16_t	tsp_seq;
44	union {
45		struct tsp_timeval tspu_time;
46		nd_int8_t tspu_hopcnt;
47	} tsp_u;
48	nd_byte		tsp_name[256];	/* null-terminated string up to 256 */
49};
50
51#define	tsp_time	tsp_u.tspu_time
52#define	tsp_hopcnt	tsp_u.tspu_hopcnt
53
54/*
55 * Command types.
56 */
57#define	TSP_ANY			0	/* match any types */
58#define	TSP_ADJTIME		1	/* send adjtime */
59#define	TSP_ACK			2	/* generic acknowledgement */
60#define	TSP_MASTERREQ		3	/* ask for master's name */
61#define	TSP_MASTERACK		4	/* acknowledge master request */
62#define	TSP_SETTIME		5	/* send network time */
63#define	TSP_MASTERUP		6	/* inform slaves that master is up */
64#define	TSP_SLAVEUP		7	/* slave is up but not polled */
65#define	TSP_ELECTION		8	/* advance candidature for master */
66#define	TSP_ACCEPT		9	/* support candidature of master */
67#define	TSP_REFUSE		10	/* reject candidature of master */
68#define	TSP_CONFLICT		11	/* two or more masters present */
69#define	TSP_RESOLVE		12	/* masters' conflict resolution */
70#define	TSP_QUIT		13	/* reject candidature if master is up */
71#define	TSP_DATE		14	/* reset the time (date command) */
72#define	TSP_DATEREQ		15	/* remote request to reset the time */
73#define	TSP_DATEACK		16	/* acknowledge time setting  */
74#define	TSP_TRACEON		17	/* turn tracing on */
75#define	TSP_TRACEOFF		18	/* turn tracing off */
76#define	TSP_MSITE		19	/* find out master's site */
77#define	TSP_MSITEREQ		20	/* remote master's site request */
78#define	TSP_TEST		21	/* for testing election algo */
79#define	TSP_SETDATE		22	/* New from date command */
80#define	TSP_SETDATEREQ		23	/* New remote for above */
81#define	TSP_LOOP		24	/* loop detection packet */
82static const struct tok tsptype_str[] = {
83	{ TSP_ANY,        "TSP_ANY"        },
84	{ TSP_ADJTIME,    "TSP_ADJTIME"    },
85	{ TSP_ACK,        "TSP_ACK"        },
86	{ TSP_MASTERREQ,  "TSP_MASTERREQ"  },
87	{ TSP_MASTERACK,  "TSP_MASTERACK"  },
88	{ TSP_SETTIME,    "TSP_SETTIME"    },
89	{ TSP_MASTERUP,   "TSP_MASTERUP"   },
90	{ TSP_SLAVEUP,    "TSP_SLAVEUP"    },
91	{ TSP_ELECTION,   "TSP_ELECTION"   },
92	{ TSP_ACCEPT,     "TSP_ACCEPT"     },
93	{ TSP_REFUSE,     "TSP_REFUSE"     },
94	{ TSP_CONFLICT,   "TSP_CONFLICT"   },
95	{ TSP_RESOLVE,    "TSP_RESOLVE"    },
96	{ TSP_QUIT,       "TSP_QUIT"       },
97	{ TSP_DATE,       "TSP_DATE"       },
98	{ TSP_DATEREQ,    "TSP_DATEREQ"    },
99	{ TSP_DATEACK,    "TSP_DATEACK"    },
100	{ TSP_TRACEON,    "TSP_TRACEON"    },
101	{ TSP_TRACEOFF,   "TSP_TRACEOFF"   },
102	{ TSP_MSITE,      "TSP_MSITE"      },
103	{ TSP_MSITEREQ,   "TSP_MSITEREQ"   },
104	{ TSP_TEST,       "TSP_TEST"       },
105	{ TSP_SETDATE,    "TSP_SETDATE"    },
106	{ TSP_SETDATEREQ, "TSP_SETDATEREQ" },
107	{ TSP_LOOP,       "TSP_LOOP"       },
108	{ 0, NULL }
109};
110
111void
112timed_print(netdissect_options *ndo,
113            const u_char *bp)
114{
115	const struct tsp *tsp = (const struct tsp *)bp;
116	uint8_t tsp_type;
117	int sec, usec;
118
119	ndo->ndo_protocol = "timed";
120	tsp_type = GET_U_1(tsp->tsp_type);
121	ND_PRINT("%s", tok2str(tsptype_str, "(tsp_type %#x)", tsp_type));
122
123	ND_PRINT(" vers %u", GET_U_1(tsp->tsp_vers));
124
125	ND_PRINT(" seq %u", GET_BE_U_2(tsp->tsp_seq));
126
127	switch (tsp_type) {
128	case TSP_LOOP:
129		ND_PRINT(" hopcnt %u", GET_U_1(tsp->tsp_hopcnt));
130		break;
131	case TSP_SETTIME:
132	case TSP_ADJTIME:
133	case TSP_SETDATE:
134	case TSP_SETDATEREQ:
135		sec = GET_BE_S_4(tsp->tsp_time.tv_sec);
136		usec = GET_BE_S_4(tsp->tsp_time.tv_usec);
137		/* XXX The comparison below is always false? */
138		if (usec < 0)
139			/* invalid, skip the rest of the packet */
140			return;
141		ND_PRINT(" time ");
142		if (sec < 0 && usec != 0) {
143			sec++;
144			if (sec == 0)
145				ND_PRINT("-");
146			usec = 1000000 - usec;
147		}
148		ND_PRINT("%d.%06d", sec, usec);
149		break;
150	}
151	ND_PRINT(" name ");
152	nd_printjnp(ndo, tsp->tsp_name, sizeof(tsp->tsp_name));
153}
154