X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/cbd4cbb99cf9e68c67af16b5b20a050ef8819af6..5ef0bcb5edd748de9d9af13c40da0395dfdd94e8:/print-timed.c diff --git a/print-timed.c b/print-timed.c index 7d246ed7..ae8d5766 100644 --- a/print-timed.c +++ b/print-timed.c @@ -19,92 +19,125 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-timed.c,v 1.2 2001-05-09 01:21:43 fenner Exp $"; -#endif +/* \summary: Berkeley UNIX Time Synchronization Protocol */ + +/* specification: https://docs.freebsd.org/44doc/smm/12.timed/paper.pdf */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include -#include -#include -#include +#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 */ + +#define TSPTYPENUMBER 25 -#include "timed.h" -#include "interface.h" -static char *tsptype[TSPTYPENUMBER] = +static const char *tsptype[TSPTYPENUMBER] = { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP", "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT", "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ", "TEST", "SETDATE", "SETDATEREQ", "LOOP" }; void -timed_print(register const u_char *bp, u_int length) +timed_print(netdissect_options *ndo, + const u_char *bp) { -#define endof(x) ((u_char *)&(x) + sizeof (x)) - struct tsp *tsp = (struct tsp *)bp; - long sec, usec; - const u_char *end; - - if (endof(tsp->tsp_type) > snapend) { - fputs("[|timed]", stdout); - return; - } - if (tsp->tsp_type < TSPTYPENUMBER) - printf("TSP_%s", tsptype[tsp->tsp_type]); + 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); + if (tsp_type < TSPTYPENUMBER) + ND_PRINT("TSP_%s", tsptype[tsp_type]); else - printf("(tsp_type %#x)", tsp->tsp_type); + ND_PRINT("(tsp_type %#x)", tsp_type); - if (endof(tsp->tsp_vers) > snapend) { - fputs(" [|timed]", stdout); - return; - } - printf(" vers %d", tsp->tsp_vers); + ND_PRINT(" vers %u", GET_U_1(tsp->tsp_vers)); - if (endof(tsp->tsp_seq) > snapend) { - fputs(" [|timed]", stdout); - return; - } - printf(" seq %d", tsp->tsp_seq); + ND_PRINT(" seq %u", GET_BE_U_2(tsp->tsp_seq)); - if (tsp->tsp_type == TSP_LOOP) { - if (endof(tsp->tsp_hopcnt) > snapend) { - fputs(" [|timed]", stdout); - return; - } - printf(" hopcnt %d", tsp->tsp_hopcnt); - } else if (tsp->tsp_type == TSP_SETTIME || - tsp->tsp_type == TSP_ADJTIME || - tsp->tsp_type == TSP_SETDATE || - tsp->tsp_type == TSP_SETDATEREQ) { - if (endof(tsp->tsp_time) > snapend) { - fputs(" [|timed]", stdout); - return; - } - sec = ntohl((long)tsp->tsp_time.tv_sec); - usec = ntohl((long)tsp->tsp_time.tv_usec); + 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) - /* corrupt, skip the rest of the packet */ + /* invalid, skip the rest of the packet */ return; - fputs(" time ", stdout); + ND_PRINT(" time "); if (sec < 0 && usec != 0) { sec++; if (sec == 0) - fputc('-', stdout); + ND_PRINT("-"); usec = 1000000 - usec; } - printf("%ld.%06ld", sec, usec); + ND_PRINT("%d.%06d", sec, usec); + break; } + ND_PRINT(" name "); + if (nd_printzp(ndo, tsp->tsp_name, sizeof(tsp->tsp_name), + ndo->ndo_snapend)) + goto trunc; + return; - end = memchr(tsp->tsp_name, '\0', snapend - (u_char *)tsp->tsp_name); - if (end == NULL) - fputs(" [|timed]", stdout); - else { - fputs(" name ", stdout); - fwrite(tsp->tsp_name, end - (u_char *)tsp->tsp_name, 1, stdout); - } +trunc: + nd_print_trunc(ndo); }