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/* $OpenBSD: mktemp.c,v 1.31 2011/10/02 07:41:56 dtucker 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)
static int
mktemp_internal(char *path, int slen, int mode)
{
char *start, *cp, *ep;
const char *tempchars = TEMPCHARS;
unsigned int r, tries;
struct stat sb;
size_t len;
int fd;
len = strlen(path);
if (len == 0 || slen < 0 || (size_t)slen >= len) {
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;
do {
for (cp = start; cp != ep; cp++) {
r = arc4random_uniform(NUM_CHARS);
*cp = tempchars[r];
}
switch (mode) {
case MKTEMP_NAME:
if (lstat(path, &sb) != 0)
return(errno == ENOENT ? 0 : -1);
break;
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_IRUSR|S_IWUSR|S_IXUSR) == 0)
return(0);
if (errno != EEXIST)
return(-1);
break;
}
} while (--tries);
errno = EEXIST;
return(-1);
}
char *_mktemp(char *);
char *
_mktemp(char *path)
{
if (mktemp_internal(path, 0, MKTEMP_NAME) == -1)
return(NULL);
return(path);
}
__warn_references(mktemp,
"warning: mktemp() possibly used unsafely; consider using mkstemp()");
char *
mktemp(char *path)
{
return(_mktemp(path));
}
int
mkstemp(char *path)
{
return(mktemp_internal(path, 0, MKTEMP_FILE));
}
int
mkstemps(char *path, int slen)
{
return(mktemp_internal(path, slen, MKTEMP_FILE));
}
char *
mkdtemp(char *path)
{
int error;
error = mktemp_internal(path, 0, MKTEMP_DIR);
return(error ? NULL : path);
}
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