1*ed775ee7SAntonio Huete Jimenez /*
2*ed775ee7SAntonio Huete Jimenez * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3*ed775ee7SAntonio Huete Jimenez * The Regents of the University of California. All rights reserved.
4*ed775ee7SAntonio Huete Jimenez *
5*ed775ee7SAntonio Huete Jimenez * Redistribution and use in source and binary forms, with or without
6*ed775ee7SAntonio Huete Jimenez * modification, are permitted provided that: (1) source code distributions
7*ed775ee7SAntonio Huete Jimenez * retain the above copyright notice and this paragraph in its entirety, (2)
8*ed775ee7SAntonio Huete Jimenez * distributions including binary code include the above copyright notice and
9*ed775ee7SAntonio Huete Jimenez * this paragraph in its entirety in the documentation or other materials
10*ed775ee7SAntonio Huete Jimenez * provided with the distribution, and (3) all advertising materials mentioning
11*ed775ee7SAntonio Huete Jimenez * features or use of this software display the following acknowledgement:
12*ed775ee7SAntonio Huete Jimenez * ``This product includes software developed by the University of California,
13*ed775ee7SAntonio Huete Jimenez * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*ed775ee7SAntonio Huete Jimenez * the University nor the names of its contributors may be used to endorse
15*ed775ee7SAntonio Huete Jimenez * or promote products derived from this software without specific prior
16*ed775ee7SAntonio Huete Jimenez * written permission.
17*ed775ee7SAntonio Huete Jimenez * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*ed775ee7SAntonio Huete Jimenez * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*ed775ee7SAntonio Huete Jimenez * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*ed775ee7SAntonio Huete Jimenez *
21*ed775ee7SAntonio Huete Jimenez */
22*ed775ee7SAntonio Huete Jimenez
23*ed775ee7SAntonio Huete Jimenez #ifdef HAVE_CONFIG_H
24*ed775ee7SAntonio Huete Jimenez #include <config.h>
25*ed775ee7SAntonio Huete Jimenez #endif
26*ed775ee7SAntonio Huete Jimenez
27*ed775ee7SAntonio Huete Jimenez #include "ntp.h"
28*ed775ee7SAntonio Huete Jimenez
29*ed775ee7SAntonio Huete Jimenez #include "extract.h"
30*ed775ee7SAntonio Huete Jimenez
31*ed775ee7SAntonio Huete Jimenez #define JAN_1970 INT64_T_CONSTANT(2208988800) /* 1970 - 1900 in seconds */
32*ed775ee7SAntonio Huete Jimenez
33*ed775ee7SAntonio Huete Jimenez void
p_ntp_time(netdissect_options * ndo,const struct l_fixedpt * lfp)34*ed775ee7SAntonio Huete Jimenez p_ntp_time(netdissect_options *ndo,
35*ed775ee7SAntonio Huete Jimenez const struct l_fixedpt *lfp)
36*ed775ee7SAntonio Huete Jimenez {
37*ed775ee7SAntonio Huete Jimenez uint32_t i;
38*ed775ee7SAntonio Huete Jimenez uint32_t uf;
39*ed775ee7SAntonio Huete Jimenez uint32_t f;
40*ed775ee7SAntonio Huete Jimenez double ff;
41*ed775ee7SAntonio Huete Jimenez
42*ed775ee7SAntonio Huete Jimenez i = GET_BE_U_4(lfp->int_part);
43*ed775ee7SAntonio Huete Jimenez uf = GET_BE_U_4(lfp->fraction);
44*ed775ee7SAntonio Huete Jimenez ff = uf;
45*ed775ee7SAntonio Huete Jimenez if (ff < 0.0) /* some compilers are buggy */
46*ed775ee7SAntonio Huete Jimenez ff += FMAXINT;
47*ed775ee7SAntonio Huete Jimenez ff = ff / FMAXINT; /* shift radix point by 32 bits */
48*ed775ee7SAntonio Huete Jimenez f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
49*ed775ee7SAntonio Huete Jimenez ND_PRINT("%u.%09u", i, f);
50*ed775ee7SAntonio Huete Jimenez
51*ed775ee7SAntonio Huete Jimenez #ifdef HAVE_STRFTIME
52*ed775ee7SAntonio Huete Jimenez /*
53*ed775ee7SAntonio Huete Jimenez * print the UTC time in human-readable format.
54*ed775ee7SAntonio Huete Jimenez */
55*ed775ee7SAntonio Huete Jimenez if (i) {
56*ed775ee7SAntonio Huete Jimenez int64_t seconds_64bit = (int64_t)i - JAN_1970;
57*ed775ee7SAntonio Huete Jimenez time_t seconds;
58*ed775ee7SAntonio Huete Jimenez struct tm *tm;
59*ed775ee7SAntonio Huete Jimenez char time_buf[128];
60*ed775ee7SAntonio Huete Jimenez
61*ed775ee7SAntonio Huete Jimenez seconds = (time_t)seconds_64bit;
62*ed775ee7SAntonio Huete Jimenez if (seconds != seconds_64bit) {
63*ed775ee7SAntonio Huete Jimenez /*
64*ed775ee7SAntonio Huete Jimenez * It doesn't fit into a time_t, so we can't hand it
65*ed775ee7SAntonio Huete Jimenez * to gmtime.
66*ed775ee7SAntonio Huete Jimenez */
67*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (unrepresentable)");
68*ed775ee7SAntonio Huete Jimenez } else {
69*ed775ee7SAntonio Huete Jimenez tm = gmtime(&seconds);
70*ed775ee7SAntonio Huete Jimenez if (tm == NULL) {
71*ed775ee7SAntonio Huete Jimenez /*
72*ed775ee7SAntonio Huete Jimenez * gmtime() can't handle it.
73*ed775ee7SAntonio Huete Jimenez * (Yes, that might happen with some version of
74*ed775ee7SAntonio Huete Jimenez * Microsoft's C library.)
75*ed775ee7SAntonio Huete Jimenez */
76*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (unrepresentable)");
77*ed775ee7SAntonio Huete Jimenez } else {
78*ed775ee7SAntonio Huete Jimenez /* use ISO 8601 (RFC3339) format */
79*ed775ee7SAntonio Huete Jimenez strftime(time_buf, sizeof (time_buf), "%Y-%m-%dT%H:%M:%SZ", tm);
80*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (%s)", time_buf);
81*ed775ee7SAntonio Huete Jimenez }
82*ed775ee7SAntonio Huete Jimenez }
83*ed775ee7SAntonio Huete Jimenez }
84*ed775ee7SAntonio Huete Jimenez #endif
85*ed775ee7SAntonio Huete Jimenez }
86