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-rw-r--r--lib/util/mktemp.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/lib/util/mktemp.c b/lib/util/mktemp.c
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+++ b/lib/util/mktemp.c
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+/*
+ * Copyright (c) 2001, 2003, 2004, 2008-2011, 2013, 2015, 2017, 2018
+ * 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>
+
+#if !defined(HAVE_MKSTEMPS) || !defined(HAVE_MKDTEMP)
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif /* HAVE_STDLIB_H */
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#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 <unistd.h>
+#include <time.h>
+
+#include "sudo_compat.h"
+#include "sudo_rand.h"
+#include "pathnames.h"
+
+#define MKTEMP_FILE 1
+#define MKTEMP_DIR 2
+
+#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
+#define MIN_X 6
+
+static int
+mktemp_internal(char *path, int slen, int mode)
+{
+ char *start, *cp, *ep;
+ const char tempchars[] = TEMPCHARS;
+ unsigned int r, tries;
+ size_t len;
+ int fd;
+
+ len = strlen(path);
+ if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
+ errno = EINVAL;
+ return -1;
+ }
+ ep = path + len - slen;
+
+ tries = 1;
+ for (start = ep; start > path && start[-1] == 'X'; start--) {
+ if (tries < INT_MAX / NUM_CHARS)
+ tries *= NUM_CHARS;
+ }
+ tries *= 2;
+ if (ep - start < MIN_X) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ do {
+ for (cp = start; cp != ep; cp++) {
+ r = arc4random_uniform(NUM_CHARS);
+ *cp = tempchars[r];
+ }
+
+ switch (mode) {
+ case MKTEMP_FILE:
+ fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
+ if (fd != -1 || errno != EEXIST)
+ return fd;
+ break;
+ case MKTEMP_DIR:
+ if (mkdir(path, S_IRWXU) == 0)
+ return 0;
+ if (errno != EEXIST)
+ return -1;
+ break;
+ }
+ } while (--tries);
+
+ errno = EEXIST;
+ return -1;
+}
+
+int
+sudo_mkstemps(char *path, int slen)
+{
+ return mktemp_internal(path, slen, MKTEMP_FILE);
+}
+
+char *
+sudo_mkdtemp(char *path)
+{
+ if (mktemp_internal(path, 0, MKTEMP_DIR) == -1)
+ return NULL;
+ return path;
+}
+#endif /* !HAVE_MKSTEMPS || !HAVE_MKDTEMP */