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