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/*
* Copyright (c) 2017 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include "sudo_compat.h"
#include "sudoers_debug.h"
#include "parse.h"
/*
* Parse a command timeout in sudoers in the format 1d2h3m4s
* (days, hours, minutes, seconds) or a number of seconds with no suffix.
* Returns the number of seconds or -1 on error.
*/
int
parse_timeout(const char *timestr)
{
debug_decl(parse_timeout, SUDOERS_DEBUG_PARSER)
const char suffixes[] = "dhms";
const char *cp = timestr;
int timeout = 0;
int idx = 0;
do {
char *ep;
char ch;
long l;
/* Parse number, must be present and positive. */
errno = 0;
l = strtol(cp, &ep, 10);
if (ep == cp) {
/* missing timeout */
errno = EINVAL;
debug_return_int(-1);
}
if (errno == ERANGE || l < 0 || l > INT_MAX)
goto overflow;
/* Find a matching suffix or return an error. */
if (*ep != '\0') {
ch = tolower((unsigned char)*ep++);
while (suffixes[idx] != ch) {
if (suffixes[idx] == '\0') {
/* parse error */
errno = EINVAL;
debug_return_int(-1);
}
idx++;
}
/* Apply suffix. */
switch (ch) {
case 'd':
if (l > INT_MAX / (24 * 60 * 60))
goto overflow;
l *= 24 * 60 * 60;
break;
case 'h':
if (l > INT_MAX / (60 * 60))
goto overflow;
l *= 60 * 60;
break;
case 'm':
if (l > INT_MAX / 60)
goto overflow;
l *= 60;
break;
}
if (l > INT_MAX - timeout)
goto overflow;
}
cp = ep;
timeout += l;
} while (*cp != '\0');
debug_return_int(timeout);
overflow:
errno = ERANGE;
debug_return_int(-1);
}
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