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Diffstat (limited to 'print-timed.c')
| -rw-r--r-- | print-timed.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/print-timed.c b/print-timed.c new file mode 100644 index 0000000..ebd0ac8 --- /dev/null +++ b/print-timed.c @@ -0,0 +1,153 @@ +/* + * 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 */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#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)); +} |