nexmon – Blame information for rev 1

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1 office 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 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26  
27 #include <tcpdump-stdinc.h>
28  
29 #include "interface.h"
30 #include "extract.h"
31  
32 /*
33 * Time Synchronization Protocol
34 */
35  
36 struct tsp_timeval {
37 uint32_t tv_sec;
38 uint32_t tv_usec;
39 };
40  
41 struct tsp {
42 uint8_t tsp_type;
43 uint8_t tsp_vers;
44 uint16_t tsp_seq;
45 union {
46 struct tsp_timeval tspu_time;
47 int8_t tspu_hopcnt;
48 } tsp_u;
49 int8_t tsp_name[256];
50 };
51  
52 #define tsp_time tsp_u.tspu_time
53 #define tsp_hopcnt tsp_u.tspu_hopcnt
54  
55 /*
56 * Command types.
57 */
58 #define TSP_ANY 0 /* match any types */
59 #define TSP_ADJTIME 1 /* send adjtime */
60 #define TSP_ACK 2 /* generic acknowledgement */
61 #define TSP_MASTERREQ 3 /* ask for master's name */
62 #define TSP_MASTERACK 4 /* acknowledge master request */
63 #define TSP_SETTIME 5 /* send network time */
64 #define TSP_MASTERUP 6 /* inform slaves that master is up */
65 #define TSP_SLAVEUP 7 /* slave is up but not polled */
66 #define TSP_ELECTION 8 /* advance candidature for master */
67 #define TSP_ACCEPT 9 /* support candidature of master */
68 #define TSP_REFUSE 10 /* reject candidature of master */
69 #define TSP_CONFLICT 11 /* two or more masters present */
70 #define TSP_RESOLVE 12 /* masters' conflict resolution */
71 #define TSP_QUIT 13 /* reject candidature if master is up */
72 #define TSP_DATE 14 /* reset the time (date command) */
73 #define TSP_DATEREQ 15 /* remote request to reset the time */
74 #define TSP_DATEACK 16 /* acknowledge time setting */
75 #define TSP_TRACEON 17 /* turn tracing on */
76 #define TSP_TRACEOFF 18 /* turn tracing off */
77 #define TSP_MSITE 19 /* find out master's site */
78 #define TSP_MSITEREQ 20 /* remote master's site request */
79 #define TSP_TEST 21 /* for testing election algo */
80 #define TSP_SETDATE 22 /* New from date command */
81 #define TSP_SETDATEREQ 23 /* New remote for above */
82 #define TSP_LOOP 24 /* loop detection packet */
83  
84 #define TSPTYPENUMBER 25
85  
86 static const char tstr[] = "[|timed]";
87  
88 static const char *tsptype[TSPTYPENUMBER] =
89 { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP",
90 "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT",
91 "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ",
92 "TEST", "SETDATE", "SETDATEREQ", "LOOP" };
93  
94 void
95 timed_print(netdissect_options *ndo,
96 register const u_char *bp)
97 {
98 struct tsp *tsp = (struct tsp *)bp;
99 long sec, usec;
100  
101 ND_TCHECK(tsp->tsp_type);
102 if (tsp->tsp_type < TSPTYPENUMBER)
103 ND_PRINT((ndo, "TSP_%s", tsptype[tsp->tsp_type]));
104 else
105 ND_PRINT((ndo, "(tsp_type %#x)", tsp->tsp_type));
106  
107 ND_TCHECK(tsp->tsp_vers);
108 ND_PRINT((ndo, " vers %u", tsp->tsp_vers));
109  
110 ND_TCHECK(tsp->tsp_seq);
111 ND_PRINT((ndo, " seq %u", tsp->tsp_seq));
112  
113 switch (tsp->tsp_type) {
114 case TSP_LOOP:
115 ND_TCHECK(tsp->tsp_hopcnt);
116 ND_PRINT((ndo, " hopcnt %u", tsp->tsp_hopcnt));
117 break;
118 case TSP_SETTIME:
119 case TSP_ADJTIME:
120 case TSP_SETDATE:
121 case TSP_SETDATEREQ:
122 ND_TCHECK(tsp->tsp_time);
123 sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
124 usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
125 /* XXX The comparison below is always false? */
126 if (usec < 0)
127 /* corrupt, skip the rest of the packet */
128 return;
129 ND_PRINT((ndo, " time "));
130 if (sec < 0 && usec != 0) {
131 sec++;
132 if (sec == 0)
133 ND_PRINT((ndo, "-"));
134 usec = 1000000 - usec;
135 }
136 ND_PRINT((ndo, "%ld.%06ld", sec, usec));
137 break;
138 }
139 ND_TCHECK(tsp->tsp_name);
140 ND_PRINT((ndo, " name "));
141 if (fn_print(ndo, (u_char *)tsp->tsp_name, (u_char *)tsp->tsp_name + sizeof(tsp->tsp_name)))
142 goto trunc;
143 return;
144  
145 trunc:
146 ND_PRINT((ndo, " %s", tstr));
147 }