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