f14670ee1a
strtou[l]l(3) silently converts negative numbers into positive. This behavior is wrong: a negative value should be parsed as a negative value, which would underflow unsigned (long) long, and so would return the smallest possible value, 0, and set errno to ERANGE to report an error. Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com> Cc: "Serge E. Hallyn" <serge@hallyn.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2017, Chris Lamb
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include "atoi/strtou_noneg.h"
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#include "defines.h"
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#include "prototypes.h"
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#include "shadowlog.h"
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/*
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* gettime() returns the time as the number of seconds since the Epoch
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*
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* Like time(), gettime() returns the time as the number of seconds since the
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* Epoch, 1970-01-01 00:00:00 +0000 (UTC), except that if the SOURCE_DATE_EPOCH
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* environment variable is exported it will use that instead.
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*/
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/*@observer@*/time_t gettime (void)
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{
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char *endptr;
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char *source_date_epoch;
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time_t fallback;
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unsigned long long epoch;
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FILE *shadow_logfd = log_get_logfd();
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fallback = time (NULL);
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source_date_epoch = shadow_getenv ("SOURCE_DATE_EPOCH");
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if (!source_date_epoch)
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return fallback;
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errno = 0;
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epoch = strtoull_noneg(source_date_epoch, &endptr, 10);
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if (errno != 0) {
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fprintf (shadow_logfd,
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_("Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n"),
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strerror(errno));
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} else if (endptr == source_date_epoch) {
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fprintf (shadow_logfd,
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_("Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n"),
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endptr);
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} else if (*endptr != '\0') {
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fprintf (shadow_logfd,
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_("Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n"),
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endptr);
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} else if (epoch > ULONG_MAX) {
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fprintf (shadow_logfd,
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_("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to %lu but was found to be: %llu\n"),
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ULONG_MAX, epoch);
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} else if ((time_t)epoch > fallback) {
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fprintf (shadow_logfd,
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_("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to the current time (%lu) but was found to be: %llu\n"),
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fallback, epoch);
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} else {
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/* Valid */
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return epoch;
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}
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return fallback;
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}
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