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/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "ntp.h"
#include "extract.h"
#define JAN_1970 INT64_T_CONSTANT(2208988800) /* 1970 - 1900 in seconds */
void
p_ntp_time(netdissect_options *ndo,
const struct l_fixedpt *lfp)
{
uint32_t i;
uint32_t uf;
uint32_t f;
double ff;
i = GET_BE_U_4(lfp->int_part);
uf = GET_BE_U_4(lfp->fraction);
ff = uf;
if (ff < 0.0) /* some compilers are buggy */
ff += FMAXINT;
ff = ff / FMAXINT; /* shift radix point by 32 bits */
f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
ND_PRINT("%u.%09u", i, f);
#ifdef HAVE_STRFTIME
/*
* print the UTC time in human-readable format.
*/
if (i) {
int64_t seconds_64bit = (int64_t)i - JAN_1970;
time_t seconds;
struct tm *tm;
char time_buf[128];
seconds = (time_t)seconds_64bit;
if (seconds != seconds_64bit) {
/*
* It doesn't fit into a time_t, so we can't hand it
* to gmtime.
*/
ND_PRINT(" (unrepresentable)");
} else {
tm = gmtime(&seconds);
if (tm == NULL) {
/*
* gmtime() can't handle it.
* (Yes, that might happen with some version of
* Microsoft's C library.)
*/
ND_PRINT(" (unrepresentable)");
} else {
/* use ISO 8601 (RFC3339) format */
strftime(time_buf, sizeof (time_buf), "%Y-%m-%dT%H:%M:%SZ", tm);
ND_PRINT(" (%s)", time_buf);
}
}
}
#endif
}
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