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