From 1d17a25a597033d38c420a0a3add7e5e82dd4c02 Mon Sep 17 00:00:00 2001
From: millert <>
Date: Fri, 19 Jan 2024 16:30:28 +0000
Subject: Move mktemp.c to stdlib where it belongs. OK deraadt@

---
 src/lib/libc/stdlib/mktemp.c | 163 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 src/lib/libc/stdlib/mktemp.c

(limited to 'src/lib/libc/stdlib/mktemp.c')

diff --git a/src/lib/libc/stdlib/mktemp.c b/src/lib/libc/stdlib/mktemp.c
new file mode 100644
index 0000000000..3b8bba7846
--- /dev/null
+++ b/src/lib/libc/stdlib/mktemp.c
@@ -0,0 +1,163 @@
+/*	$OpenBSD: mktemp.c,v 1.1 2024/01/19 16:30:28 millert Exp $ */
+/*
+ * Copyright (c) 1996-1998, 2008 Theo de Raadt
+ * Copyright (c) 1997, 2008-2009 Todd C. Miller
+ *
+ * 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.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+
+#define MKTEMP_NAME	0
+#define MKTEMP_FILE	1
+#define MKTEMP_DIR	2
+
+#define TEMPCHARS	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+#define NUM_CHARS	(sizeof(TEMPCHARS) - 1)
+#define MIN_X		6
+
+#define MKOTEMP_FLAGS	(O_APPEND | O_CLOEXEC | O_DSYNC | O_RSYNC | O_SYNC)
+
+#ifndef nitems
+#define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
+#endif
+
+static int
+mktemp_internal(char *path, int slen, int mode, int flags)
+{
+	char *start, *cp, *ep;
+	const char tempchars[] = TEMPCHARS;
+	unsigned int tries;
+	struct stat sb;
+	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;
+
+	for (start = ep; start > path && start[-1] == 'X'; start--)
+		;
+	if (ep - start < MIN_X) {
+		errno = EINVAL;
+		return(-1);
+	}
+
+	if (flags & ~MKOTEMP_FLAGS) {
+		errno = EINVAL;
+		return(-1);
+	}
+	flags |= O_CREAT | O_EXCL | O_RDWR;
+
+	tries = INT_MAX;
+	do {
+		cp = start;
+		do {
+			unsigned short rbuf[16];
+			unsigned int i;
+
+			/*
+			 * Avoid lots of arc4random() calls by using
+			 * a buffer sized for up to 16 Xs at a time.
+			 */
+			arc4random_buf(rbuf, sizeof(rbuf));
+			for (i = 0; i < nitems(rbuf) && cp != ep; i++)
+				*cp++ = tempchars[rbuf[i] % NUM_CHARS];
+		} while (cp != ep);
+
+		switch (mode) {
+		case MKTEMP_NAME:
+			if (lstat(path, &sb) != 0)
+				return(errno == ENOENT ? 0 : -1);
+			break;
+		case MKTEMP_FILE:
+			fd = open(path, flags, S_IRUSR|S_IWUSR);
+			if (fd != -1 || errno != EEXIST)
+				return(fd);
+			break;
+		case MKTEMP_DIR:
+			if (mkdir(path, S_IRUSR|S_IWUSR|S_IXUSR) == 0)
+				return(0);
+			if (errno != EEXIST)
+				return(-1);
+			break;
+		}
+	} while (--tries);
+
+	errno = EEXIST;
+	return(-1);
+}
+
+char *
+_mktemp(char *path)
+{
+	if (mktemp_internal(path, 0, MKTEMP_NAME, 0) == -1)
+		return(NULL);
+	return(path);
+}
+
+__warn_references(mktemp,
+    "mktemp() possibly used unsafely; consider using mkstemp()");
+
+char *
+mktemp(char *path)
+{
+	return(_mktemp(path));
+}
+
+int
+mkostemps(char *path, int slen, int flags)
+{
+	return(mktemp_internal(path, slen, MKTEMP_FILE, flags));
+}
+
+int
+mkstemp(char *path)
+{
+	return(mktemp_internal(path, 0, MKTEMP_FILE, 0));
+}
+DEF_WEAK(mkstemp);
+
+int
+mkostemp(char *path, int flags)
+{
+	return(mktemp_internal(path, 0, MKTEMP_FILE, flags));
+}
+DEF_WEAK(mkostemp);
+
+int
+mkstemps(char *path, int slen)
+{
+	return(mktemp_internal(path, slen, MKTEMP_FILE, 0));
+}
+
+char *
+mkdtemp(char *path)
+{
+	int error;
+
+	error = mktemp_internal(path, 0, MKTEMP_DIR, 0);
+	return(error ? NULL : path);
+}
-- 
cgit v1.2.3-55-g6feb