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/*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: mktemp.c,v 1.10 1997/10/07 22:21:34 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
static int _gettemp __P((char *, int *, int));
int
mkstemp(path)
char *path;
{
int fd;
return (_gettemp(path, &fd, 0) ? fd : -1);
}
char *
mkdtemp(path)
char *path;
{
return(_gettemp(path, (int *)NULL, 1) ? path : (char *)NULL);
}
char *_mktemp __P((char *));
char *
_mktemp(path)
char *path;
{
return(_gettemp(path, (int *)NULL, 0) ? path : (char *)NULL);
}
__warn_references(mktemp,
"warning: mktemp() possibly used unsafely; consider using mkstemp()");
char *
mktemp(path)
char *path;
{
return(_mktemp(path));
}
static int
_gettemp(path, doopen, domkdir)
char *path;
register int *doopen;
int domkdir;
{
register char *start, *trv;
struct stat sbuf;
int pid, rval;
if (doopen && domkdir) {
errno = EINVAL;
return(0);
}
pid = getpid();
for (trv = path; *trv; ++trv)
;
--trv;
while (*trv == 'X' && pid != 0) {
*trv-- = (pid % 10) + '0';
pid /= 10;
}
while (*trv == 'X') {
char c;
pid = (arc4random() & 0xffff) % (26+26);
if (pid < 26)
c = pid + 'A';
else
c = (pid - 26) + 'a';
*trv-- = c;
}
/*
* check the target directory; if you have six X's and it
* doesn't exist this runs for a *very* long time.
*/
if (doopen || domkdir) {
for (start = trv + 1;; --trv) {
if (trv <= path)
break;
if (*trv == '/') {
*trv = '\0';
rval = stat(path, &sbuf);
*trv = '/';
if (rval != 0)
return(0);
if (!S_ISDIR(sbuf.st_mode)) {
errno = ENOTDIR;
return(0);
}
break;
}
}
}
for (;;) {
if (doopen) {
if ((*doopen =
open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
return(1);
if (errno != EEXIST)
return(0);
} else if (domkdir) {
if (mkdir(path, 0700) == 0)
return(1);
if (errno != EEXIST)
return(0);
} else if (lstat(path, &sbuf))
return(errno == ENOENT ? 1 : 0);
/* tricky little algorithm for backward compatibility */
for (trv = start;;) {
if (!*trv)
return(0);
if (*trv == 'z')
*trv++ = 'a';
else {
if (isdigit(*trv))
*trv = 'a';
else
++*trv;
break;
}
}
}
/*NOTREACHED*/
}
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