446ae3f507
In the pre-POSIX days BSD had strings.h, not string.h. Now strings.h is only used for non-ANSI string functions.
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2001, 2003, 2004, 2008-2011, 2013, 2015, 2017, 2018
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* 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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#if !defined(HAVE_MKSTEMPS) || !defined(HAVE_MKDTEMP)
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#if defined(HAVE_STDINT_H)
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# include <stdint.h>
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#elif defined(HAVE_INTTYPES_H)
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# include <inttypes.h>
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#endif
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include "sudo_compat.h"
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#include "sudo_rand.h"
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#include "pathnames.h"
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#define MKTEMP_FILE 1
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#define MKTEMP_DIR 2
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#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
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#define MIN_X 6
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static int
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mktemp_internal(char *path, int slen, int mode)
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{
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char *start, *cp, *ep;
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const char tempchars[] = TEMPCHARS;
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unsigned int r, tries;
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size_t len;
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int fd;
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len = strlen(path);
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if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
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errno = EINVAL;
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return -1;
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}
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ep = path + len - slen;
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tries = 1;
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for (start = ep; start > path && start[-1] == 'X'; start--) {
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if (tries < INT_MAX / NUM_CHARS)
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tries *= NUM_CHARS;
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}
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tries *= 2;
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if (ep - start < MIN_X) {
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errno = EINVAL;
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return -1;
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}
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do {
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for (cp = start; cp != ep; cp++) {
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r = arc4random_uniform(NUM_CHARS);
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*cp = tempchars[r];
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}
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switch (mode) {
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case MKTEMP_FILE:
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fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
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if (fd != -1 || errno != EEXIST)
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return fd;
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break;
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case MKTEMP_DIR:
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if (mkdir(path, S_IRWXU) == 0)
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return 0;
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if (errno != EEXIST)
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return -1;
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break;
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}
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} while (--tries);
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errno = EEXIST;
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return -1;
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}
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int
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sudo_mkstemps(char *path, int slen)
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{
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return mktemp_internal(path, slen, MKTEMP_FILE);
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}
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char *
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sudo_mkdtemp(char *path)
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{
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if (mktemp_internal(path, 0, MKTEMP_DIR) == -1)
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return NULL;
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return path;
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}
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#endif /* !HAVE_MKSTEMPS || !HAVE_MKDTEMP */
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