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/*
* Copyright (c) 2000 Ben Smithurst <ben@scientia.demon.co.uk>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* \summary: Berkeley UNIX Time Synchronization Protocol */
/* specification: https://docs.freebsd.org/44doc/smm/12.timed/paper.pdf */
#include <config.h>
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "extract.h"
struct tsp_timeval {
nd_int32_t tv_sec;
nd_int32_t tv_usec;
};
struct tsp {
nd_uint8_t tsp_type;
nd_uint8_t tsp_vers;
nd_uint16_t tsp_seq;
union {
struct tsp_timeval tspu_time;
nd_int8_t tspu_hopcnt;
} tsp_u;
nd_byte tsp_name[256]; /* null-terminated string up to 256 */
};
#define tsp_time tsp_u.tspu_time
#define tsp_hopcnt tsp_u.tspu_hopcnt
/*
* Command types.
*/
#define TSP_ANY 0 /* match any types */
#define TSP_ADJTIME 1 /* send adjtime */
#define TSP_ACK 2 /* generic acknowledgement */
#define TSP_MASTERREQ 3 /* ask for master's name */
#define TSP_MASTERACK 4 /* acknowledge master request */
#define TSP_SETTIME 5 /* send network time */
#define TSP_MASTERUP 6 /* inform slaves that master is up */
#define TSP_SLAVEUP 7 /* slave is up but not polled */
#define TSP_ELECTION 8 /* advance candidature for master */
#define TSP_ACCEPT 9 /* support candidature of master */
#define TSP_REFUSE 10 /* reject candidature of master */
#define TSP_CONFLICT 11 /* two or more masters present */
#define TSP_RESOLVE 12 /* masters' conflict resolution */
#define TSP_QUIT 13 /* reject candidature if master is up */
#define TSP_DATE 14 /* reset the time (date command) */
#define TSP_DATEREQ 15 /* remote request to reset the time */
#define TSP_DATEACK 16 /* acknowledge time setting */
#define TSP_TRACEON 17 /* turn tracing on */
#define TSP_TRACEOFF 18 /* turn tracing off */
#define TSP_MSITE 19 /* find out master's site */
#define TSP_MSITEREQ 20 /* remote master's site request */
#define TSP_TEST 21 /* for testing election algo */
#define TSP_SETDATE 22 /* New from date command */
#define TSP_SETDATEREQ 23 /* New remote for above */
#define TSP_LOOP 24 /* loop detection packet */
static const struct tok tsptype_str[] = {
{ TSP_ANY, "TSP_ANY" },
{ TSP_ADJTIME, "TSP_ADJTIME" },
{ TSP_ACK, "TSP_ACK" },
{ TSP_MASTERREQ, "TSP_MASTERREQ" },
{ TSP_MASTERACK, "TSP_MASTERACK" },
{ TSP_SETTIME, "TSP_SETTIME" },
{ TSP_MASTERUP, "TSP_MASTERUP" },
{ TSP_SLAVEUP, "TSP_SLAVEUP" },
{ TSP_ELECTION, "TSP_ELECTION" },
{ TSP_ACCEPT, "TSP_ACCEPT" },
{ TSP_REFUSE, "TSP_REFUSE" },
{ TSP_CONFLICT, "TSP_CONFLICT" },
{ TSP_RESOLVE, "TSP_RESOLVE" },
{ TSP_QUIT, "TSP_QUIT" },
{ TSP_DATE, "TSP_DATE" },
{ TSP_DATEREQ, "TSP_DATEREQ" },
{ TSP_DATEACK, "TSP_DATEACK" },
{ TSP_TRACEON, "TSP_TRACEON" },
{ TSP_TRACEOFF, "TSP_TRACEOFF" },
{ TSP_MSITE, "TSP_MSITE" },
{ TSP_MSITEREQ, "TSP_MSITEREQ" },
{ TSP_TEST, "TSP_TEST" },
{ TSP_SETDATE, "TSP_SETDATE" },
{ TSP_SETDATEREQ, "TSP_SETDATEREQ" },
{ TSP_LOOP, "TSP_LOOP" },
{ 0, NULL }
};
void
timed_print(netdissect_options *ndo,
const u_char *bp)
{
const struct tsp *tsp = (const struct tsp *)bp;
uint8_t tsp_type;
int sec, usec;
ndo->ndo_protocol = "timed";
tsp_type = GET_U_1(tsp->tsp_type);
ND_PRINT("%s", tok2str(tsptype_str, "(tsp_type %#x)", tsp_type));
ND_PRINT(" vers %u", GET_U_1(tsp->tsp_vers));
ND_PRINT(" seq %u", GET_BE_U_2(tsp->tsp_seq));
switch (tsp_type) {
case TSP_LOOP:
ND_PRINT(" hopcnt %u", GET_U_1(tsp->tsp_hopcnt));
break;
case TSP_SETTIME:
case TSP_ADJTIME:
case TSP_SETDATE:
case TSP_SETDATEREQ:
sec = GET_BE_S_4(tsp->tsp_time.tv_sec);
usec = GET_BE_S_4(tsp->tsp_time.tv_usec);
/* XXX The comparison below is always false? */
if (usec < 0)
/* invalid, skip the rest of the packet */
return;
ND_PRINT(" time ");
if (sec < 0 && usec != 0) {
sec++;
if (sec == 0)
ND_PRINT("-");
usec = 1000000 - usec;
}
ND_PRINT("%d.%06d", sec, usec);
break;
}
ND_PRINT(" name ");
nd_printjnp(ndo, tsp->tsp_name, sizeof(tsp->tsp_name));
}
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