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 /* \summary: BSD time daemon protocol printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include <netdissect-stdinc.h>
29
30 #include "netdissect.h"
31 #include "extract.h"
32
33 /*
34 * Time Synchronization Protocol
35 *
36 * http://docs.freebsd.org/44doc/smm/12.timed/paper.pdf
37 */
38
39 struct tsp_timeval {
40 uint32_t tv_sec;
41 uint32_t tv_usec;
42 };
43
44 struct tsp {
45 uint8_t tsp_type;
46 uint8_t tsp_vers;
47 uint16_t tsp_seq;
48 union {
49 struct tsp_timeval tspu_time;
50 int8_t tspu_hopcnt;
51 } tsp_u;
52 int8_t tsp_name[256];
53 };
54
55 #define tsp_time tsp_u.tspu_time
56 #define tsp_hopcnt tsp_u.tspu_hopcnt
57
58 /*
59 * Command types.
60 */
61 #define TSP_ANY 0 /* match any types */
62 #define TSP_ADJTIME 1 /* send adjtime */
63 #define TSP_ACK 2 /* generic acknowledgement */
64 #define TSP_MASTERREQ 3 /* ask for master's name */
65 #define TSP_MASTERACK 4 /* acknowledge master request */
66 #define TSP_SETTIME 5 /* send network time */
67 #define TSP_MASTERUP 6 /* inform slaves that master is up */
68 #define TSP_SLAVEUP 7 /* slave is up but not polled */
69 #define TSP_ELECTION 8 /* advance candidature for master */
70 #define TSP_ACCEPT 9 /* support candidature of master */
71 #define TSP_REFUSE 10 /* reject candidature of master */
72 #define TSP_CONFLICT 11 /* two or more masters present */
73 #define TSP_RESOLVE 12 /* masters' conflict resolution */
74 #define TSP_QUIT 13 /* reject candidature if master is up */
75 #define TSP_DATE 14 /* reset the time (date command) */
76 #define TSP_DATEREQ 15 /* remote request to reset the time */
77 #define TSP_DATEACK 16 /* acknowledge time setting */
78 #define TSP_TRACEON 17 /* turn tracing on */
79 #define TSP_TRACEOFF 18 /* turn tracing off */
80 #define TSP_MSITE 19 /* find out master's site */
81 #define TSP_MSITEREQ 20 /* remote master's site request */
82 #define TSP_TEST 21 /* for testing election algo */
83 #define TSP_SETDATE 22 /* New from date command */
84 #define TSP_SETDATEREQ 23 /* New remote for above */
85 #define TSP_LOOP 24 /* loop detection packet */
86
87 #define TSPTYPENUMBER 25
88
89 static const char tstr[] = "[|timed]";
90
91 static const char *tsptype[TSPTYPENUMBER] =
92 { "ANY", "ADJTIME", "ACK", "MASTERREQ", "MASTERACK", "SETTIME", "MASTERUP",
93 "SLAVEUP", "ELECTION", "ACCEPT", "REFUSE", "CONFLICT", "RESOLVE", "QUIT",
94 "DATE", "DATEREQ", "DATEACK", "TRACEON", "TRACEOFF", "MSITE", "MSITEREQ",
95 "TEST", "SETDATE", "SETDATEREQ", "LOOP" };
96
97 void
timed_print(netdissect_options * ndo,register const u_char * bp)98 timed_print(netdissect_options *ndo,
99 register const u_char *bp)
100 {
101 const struct tsp *tsp = (const struct tsp *)bp;
102 long sec, usec;
103
104 ND_TCHECK(tsp->tsp_type);
105 if (tsp->tsp_type < TSPTYPENUMBER)
106 ND_PRINT((ndo, "TSP_%s", tsptype[tsp->tsp_type]));
107 else
108 ND_PRINT((ndo, "(tsp_type %#x)", tsp->tsp_type));
109
110 ND_TCHECK(tsp->tsp_vers);
111 ND_PRINT((ndo, " vers %u", tsp->tsp_vers));
112
113 ND_TCHECK(tsp->tsp_seq);
114 ND_PRINT((ndo, " seq %u", tsp->tsp_seq));
115
116 switch (tsp->tsp_type) {
117 case TSP_LOOP:
118 ND_TCHECK(tsp->tsp_hopcnt);
119 ND_PRINT((ndo, " hopcnt %u", tsp->tsp_hopcnt));
120 break;
121 case TSP_SETTIME:
122 case TSP_ADJTIME:
123 case TSP_SETDATE:
124 case TSP_SETDATEREQ:
125 ND_TCHECK(tsp->tsp_time);
126 sec = EXTRACT_32BITS(&tsp->tsp_time.tv_sec);
127 usec = EXTRACT_32BITS(&tsp->tsp_time.tv_usec);
128 /* XXX The comparison below is always false? */
129 if (usec < 0)
130 /* invalid, skip the rest of the packet */
131 return;
132 ND_PRINT((ndo, " time "));
133 if (sec < 0 && usec != 0) {
134 sec++;
135 if (sec == 0)
136 ND_PRINT((ndo, "-"));
137 usec = 1000000 - usec;
138 }
139 ND_PRINT((ndo, "%ld.%06ld", sec, usec));
140 break;
141 }
142 ND_TCHECK(tsp->tsp_name);
143 ND_PRINT((ndo, " name "));
144 if (fn_print(ndo, (const u_char *)tsp->tsp_name, (const u_char *)tsp->tsp_name + sizeof(tsp->tsp_name)))
145 goto trunc;
146 return;
147
148 trunc:
149 ND_PRINT((ndo, " %s", tstr));
150 }
151