1 files changed, 123 insertions, 0 deletions
diff --git a/lib/util/mktemp.c b/lib/util/mktemp.c
new file mode 100644
index 0000000..c4ac2b3
--- /dev/null
+++ b/lib/util/mktemp.c
@@ -0,0 +1,123 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * 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/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
+#include <string.h>
+#include <ctype.h>
+#include <unistd.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 */