2018-10-04 02:19:37 +08:00
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/*
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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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/*
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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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char time_buf[128];
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Have a common routine for converting dates and times to strings.
Have a routine that takes a buffer, a strftime format, and a struct tm *
as arguments, and:
* checks whether the struct tm * is null and, if so, returns a string
indicating that the date and time couldn't be converted;
* otherwise, passes it to strftime(), along with the buffer and the
format argument and, if strftime() returns 0, meaning the string didn't
fit into the buffer and thus that the buffer's contents are undefined,
returns a string indicating that the date and time didn't fit into the
buffer;
* otherwise, returns a pointer to the buffer.
Call that routine instead of directly calling strftime() in printers;
that prevents printing a buffer with undefined data if the buffer isn't
big enough for the string.
Also, when generating file names using an strftime format, check the
return value of strftime() to make sure the buffer didn't overflow.
2023-01-31 15:03:16 +08:00
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const char *time_string;
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2018-10-04 02:19:37 +08:00
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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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Have a common routine for converting dates and times to strings.
Have a routine that takes a buffer, a strftime format, and a struct tm *
as arguments, and:
* checks whether the struct tm * is null and, if so, returns a string
indicating that the date and time couldn't be converted;
* otherwise, passes it to strftime(), along with the buffer and the
format argument and, if strftime() returns 0, meaning the string didn't
fit into the buffer and thus that the buffer's contents are undefined,
returns a string indicating that the date and time didn't fit into the
buffer;
* otherwise, returns a pointer to the buffer.
Call that routine instead of directly calling strftime() in printers;
that prevents printing a buffer with undefined data if the buffer isn't
big enough for the string.
Also, when generating file names using an strftime format, check the
return value of strftime() to make sure the buffer didn't overflow.
2023-01-31 15:03:16 +08:00
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time_string = "[Time is too large to fit into a time_t]";
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2018-10-04 02:19:37 +08:00
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} else {
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Have a common routine for converting dates and times to strings.
Have a routine that takes a buffer, a strftime format, and a struct tm *
as arguments, and:
* checks whether the struct tm * is null and, if so, returns a string
indicating that the date and time couldn't be converted;
* otherwise, passes it to strftime(), along with the buffer and the
format argument and, if strftime() returns 0, meaning the string didn't
fit into the buffer and thus that the buffer's contents are undefined,
returns a string indicating that the date and time didn't fit into the
buffer;
* otherwise, returns a pointer to the buffer.
Call that routine instead of directly calling strftime() in printers;
that prevents printing a buffer with undefined data if the buffer isn't
big enough for the string.
Also, when generating file names using an strftime format, check the
return value of strftime() to make sure the buffer didn't overflow.
2023-01-31 15:03:16 +08:00
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/* use ISO 8601 (RFC3339) format */
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time_string = nd_format_time(time_buf, sizeof (time_buf),
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"%Y-%m-%dT%H:%M:%SZ", gmtime(&seconds));
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2018-10-04 02:19:37 +08:00
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}
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Have a common routine for converting dates and times to strings.
Have a routine that takes a buffer, a strftime format, and a struct tm *
as arguments, and:
* checks whether the struct tm * is null and, if so, returns a string
indicating that the date and time couldn't be converted;
* otherwise, passes it to strftime(), along with the buffer and the
format argument and, if strftime() returns 0, meaning the string didn't
fit into the buffer and thus that the buffer's contents are undefined,
returns a string indicating that the date and time didn't fit into the
buffer;
* otherwise, returns a pointer to the buffer.
Call that routine instead of directly calling strftime() in printers;
that prevents printing a buffer with undefined data if the buffer isn't
big enough for the string.
Also, when generating file names using an strftime format, check the
return value of strftime() to make sure the buffer didn't overflow.
2023-01-31 15:03:16 +08:00
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ND_PRINT(" (%s)", time_string);
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2018-10-04 02:19:37 +08:00
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}
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}
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