The Tcpdump Group git mirrors - tcpdump/blob - print-timed.c

   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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33
  34 /*
  35  * Time Synchronization Protocol
  36  */
  37
  38 struct tsp_timeval {
  39         u_int32_t       tv_sec;
  40         u_int32_t       tv_usec;
  41 };
  42
  43 struct tsp {
  44         u_int8_t        tsp_type;
  45         u_int8_t        tsp_vers;
  46         u_int16_t       tsp_seq;
  47         union {
  48                 struct tsp_timeval tspu_time;
  49                 int8_t tspu_hopcnt;
  50         } tsp_u;
  51         int8_t tsp_name[256];
  52 };
  53
  54 #define tsp_time        tsp_u.tspu_time
  55 #define tsp_hopcnt      tsp_u.tspu_hopcnt
  56
  57 /*
  58  * Command types.
  59  */
  60 #define TSP_ANY                 0       /* match any types */
  61 #define TSP_ADJTIME             1       /* send adjtime */
  62 #define TSP_ACK                 2       /* generic acknowledgement */
  63 #define TSP_MASTERREQ           3       /* ask for master's name */
  64 #define TSP_MASTERACK           4       /* acknowledge master request */
  65 #define TSP_SETTIME             5       /* send network time */
  66 #define TSP_MASTERUP            6       /* inform slaves that master is up */
  67 #define TSP_SLAVEUP             7       /* slave is up but not polled */
  68 #define TSP_ELECTION            8       /* advance candidature for master */
  69 #define TSP_ACCEPT              9       /* support candidature of master */
  70 #define TSP_REFUSE              10      /* reject candidature of master */
  71 #define TSP_CONFLICT            11      /* two or more masters present */
  72 #define TSP_RESOLVE             12      /* masters' conflict resolution */
  73 #define TSP_QUIT                13      /* reject candidature if master is up */
  74 #define TSP_DATE                14      /* reset the time (date command) */
  75 #define TSP_DATEREQ             15      /* remote request to reset the time */
  76 #define TSP_DATEACK             16      /* acknowledge time setting  */
  77 #define TSP_TRACEON             17      /* turn tracing on */
  78 #define TSP_TRACEOFF            18      /* turn tracing off */
  79 #define TSP_MSITE               19      /* find out master's site */
  80 #define TSP_MSITEREQ            20      /* remote master's site request */
  81 #define TSP_TEST                21      /* for testing election algo */
  82 #define TSP_SETDATE             22      /* New from date command */
  83 #define TSP_SETDATEREQ          23      /* New remote for above */
  84 #define TSP_LOOP                24      /* loop detection packet */
  85
  86 #define TSPTYPENUMBER           25
  87
  88 static const char tstr[] = "[|timed]";
  89
  90 static const char *tsptype[TSPTYPENUMBER] =
  91   { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP",
  92   "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT",
  93   "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ",
  94   "TEST", "SETDATE", "SETDATEREQ", "LOOP" };
  95
  96 void
  97 timed_print(register const u_char *bp)
  98 {
  99 #define endof(x) ((u_char *)&(x) + sizeof (x))
 100         struct tsp *tsp = (struct tsp *)bp;
 101         long sec, usec;
 102         const u_char *end;
 103
 104         if (endof(tsp->tsp_type) > snapend) {
 105                 printf("%s", tstr);
 106                 return;
 107         }
 108         if (tsp->tsp_type < TSPTYPENUMBER)
 109                 printf("TSP_%s", tsptype[tsp->tsp_type]);
 110         else
 111                 printf("(tsp_type %#x)", tsp->tsp_type);
 112
 113         if (endof(tsp->tsp_vers) > snapend) {
 114                 printf(" %s", tstr);
 115                 return;
 116         }
 117         printf(" vers %d", tsp->tsp_vers);
 118
 119         if (endof(tsp->tsp_seq) > snapend) {
 120                 printf(" %s", tstr);
 121                 return;
 122         }
 123         printf(" seq %d", tsp->tsp_seq);
 124
 125         if (tsp->tsp_type == TSP_LOOP) {
 126                 if (endof(tsp->tsp_hopcnt) > snapend) {
 127                         printf(" %s", tstr);
 128                         return;
 129                 }
 130                 printf(" hopcnt %d", tsp->tsp_hopcnt);
 131         } else if (tsp->tsp_type == TSP_SETTIME ||
 132           tsp->tsp_type == TSP_ADJTIME ||
 133           tsp->tsp_type == TSP_SETDATE ||
 134           tsp->tsp_type == TSP_SETDATEREQ) {
 135                 if (endof(tsp->tsp_time) > snapend) {
 136                         printf(" %s", tstr);
 137                         return;
 138                 }
 139                 sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
 140                 usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
 141                 if (usec < 0)
 142                         /* corrupt, skip the rest of the packet */
 143                         return;
 144                 fputs(" time ", stdout);
 145                 if (sec < 0 && usec != 0) {
 146                         sec++;
 147                         if (sec == 0)
 148                                 fputc('-', stdout);
 149                         usec = 1000000 - usec;
 150                 }
 151                 printf("%ld.%06ld", sec, usec);
 152         }
 153
 154         end = memchr(tsp->tsp_name, '\0', snapend - (u_char *)tsp->tsp_name);
 155         if (end == NULL)
 156                 printf(" %s", tstr);
 157         else {
 158                 fputs(" name ", stdout);
 159                 fwrite(tsp->tsp_name, end - (u_char *)tsp->tsp_name, 1, stdout);
 160         }
 161 }