1*05b00f60SXin Li /*
2*05b00f60SXin Li * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3*05b00f60SXin Li * The Regents of the University of California. All rights reserved.
4*05b00f60SXin Li *
5*05b00f60SXin Li * Redistribution and use in source and binary forms, with or without
6*05b00f60SXin Li * modification, are permitted provided that: (1) source code distributions
7*05b00f60SXin Li * retain the above copyright notice and this paragraph in its entirety, (2)
8*05b00f60SXin Li * distributions including binary code include the above copyright notice and
9*05b00f60SXin Li * this paragraph in its entirety in the documentation or other materials
10*05b00f60SXin Li * provided with the distribution, and (3) all advertising materials mentioning
11*05b00f60SXin Li * features or use of this software display the following acknowledgement:
12*05b00f60SXin Li * ``This product includes software developed by the University of California,
13*05b00f60SXin Li * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*05b00f60SXin Li * the University nor the names of its contributors may be used to endorse
15*05b00f60SXin Li * or promote products derived from this software without specific prior
16*05b00f60SXin Li * written permission.
17*05b00f60SXin Li * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*05b00f60SXin Li * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*05b00f60SXin Li * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*05b00f60SXin Li *
21*05b00f60SXin Li */
22*05b00f60SXin Li
23*05b00f60SXin Li #ifdef HAVE_CONFIG_H
24*05b00f60SXin Li #include <config.h>
25*05b00f60SXin Li #endif
26*05b00f60SXin Li
27*05b00f60SXin Li #include "ntp.h"
28*05b00f60SXin Li
29*05b00f60SXin Li #include "extract.h"
30*05b00f60SXin Li
31*05b00f60SXin Li #define JAN_1970 INT64_T_CONSTANT(2208988800) /* 1970 - 1900 in seconds */
32*05b00f60SXin Li
33*05b00f60SXin Li void
p_ntp_time(netdissect_options * ndo,const struct l_fixedpt * lfp)34*05b00f60SXin Li p_ntp_time(netdissect_options *ndo,
35*05b00f60SXin Li const struct l_fixedpt *lfp)
36*05b00f60SXin Li {
37*05b00f60SXin Li uint32_t i;
38*05b00f60SXin Li uint32_t uf;
39*05b00f60SXin Li uint32_t f;
40*05b00f60SXin Li double ff;
41*05b00f60SXin Li
42*05b00f60SXin Li i = GET_BE_U_4(lfp->int_part);
43*05b00f60SXin Li uf = GET_BE_U_4(lfp->fraction);
44*05b00f60SXin Li ff = uf;
45*05b00f60SXin Li if (ff < 0.0) /* some compilers are buggy */
46*05b00f60SXin Li ff += FMAXINT;
47*05b00f60SXin Li ff = ff / FMAXINT; /* shift radix point by 32 bits */
48*05b00f60SXin Li f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
49*05b00f60SXin Li ND_PRINT("%u.%09u", i, f);
50*05b00f60SXin Li
51*05b00f60SXin Li /*
52*05b00f60SXin Li * print the UTC time in human-readable format.
53*05b00f60SXin Li */
54*05b00f60SXin Li if (i) {
55*05b00f60SXin Li int64_t seconds_64bit = (int64_t)i - JAN_1970;
56*05b00f60SXin Li time_t seconds;
57*05b00f60SXin Li char time_buf[128];
58*05b00f60SXin Li const char *time_string;
59*05b00f60SXin Li
60*05b00f60SXin Li seconds = (time_t)seconds_64bit;
61*05b00f60SXin Li if (seconds != seconds_64bit) {
62*05b00f60SXin Li /*
63*05b00f60SXin Li * It doesn't fit into a time_t, so we can't hand it
64*05b00f60SXin Li * to gmtime.
65*05b00f60SXin Li */
66*05b00f60SXin Li time_string = "[Time is too large to fit into a time_t]";
67*05b00f60SXin Li } else {
68*05b00f60SXin Li /* use ISO 8601 (RFC3339) format */
69*05b00f60SXin Li time_string = nd_format_time(time_buf, sizeof (time_buf),
70*05b00f60SXin Li "%Y-%m-%dT%H:%M:%SZ", gmtime(&seconds));
71*05b00f60SXin Li }
72*05b00f60SXin Li ND_PRINT(" (%s)", time_string);
73*05b00f60SXin Li }
74*05b00f60SXin Li }
75