mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-13 20:04:28 +08:00
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
|
|
* 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
|
|
}
|