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/* $OpenBSD: mktemp.c,v 1.39 2017/11/28 06:55:49 tb 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);
}
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