freebsd-dev/crypto/openssh/openbsd-compat/mktemp.c
2008-07-22 19:01:18 +00:00

179 lines
4.2 KiB
C

/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
/* Changes: Removed mktemp */
/* $OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $ */
/*
* 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. 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.
*/
/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */
#include "includes.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP)
static int _gettemp(char *, int *, int, int);
int
mkstemps(char *path, int slen)
{
int fd;
return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}
int
mkstemp(char *path)
{
int fd;
return (_gettemp(path, &fd, 0, 0) ? fd : -1);
}
char *
mkdtemp(char *path)
{
return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
}
static int
_gettemp(path, doopen, domkdir, slen)
char *path;
register int *doopen;
int domkdir;
int slen;
{
register char *start, *trv, *suffp;
struct stat sbuf;
int rval;
pid_t pid;
if (doopen && domkdir) {
errno = EINVAL;
return(0);
}
for (trv = path; *trv; ++trv)
;
trv -= slen;
suffp = trv;
--trv;
if (trv < path) {
errno = EINVAL;
return (0);
}
pid = getpid();
while (trv >= path && *trv == 'X' && pid != 0) {
*trv-- = (pid % 10) + '0';
pid /= 10;
}
while (trv >= path && *trv == 'X') {
char c;
pid = (arc4random() & 0xffff) % (26+26);
if (pid < 26)
c = pid + 'A';
else
c = (pid - 26) + 'a';
*trv-- = c;
}
start = trv + 1;
/*
* 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 (;; --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') {
if (trv == suffp)
return (0);
*trv++ = 'a';
} else {
if (isdigit(*trv))
*trv = 'a';
else if (*trv == 'z') /* inc from z to A */
*trv = 'A';
else {
if (trv == suffp)
return (0);
++*trv;
}
break;
}
}
}
/*NOTREACHED*/
}
#endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */