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/*
* Modified version of 'mktemp.c' from FreeBSD
* http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/stdio/mktemp.c
* ?rev=1.29.2.2.2.1;content-type=text%2Fplain
*/
/*
* 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.
* 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.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <windows.h>
#include <wincrypt.h>
static int random(uint32_t *);
static int _gettemp(char *, int *);
static const unsigned char padchar[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
int unixcompat_mkstemp(char *path)
{
int fd;
if (_gettemp(path, &fd))
return fd;
return -1;
}
static int _gettemp(char *path, int *doopen)
{
char *start, *trv, *suffp, *carryp;
char *pad;
struct _stat sbuf;
int rval;
uint32_t randidx, randval;
char carrybuf[MAXPATHLEN];
for (trv = path; *trv != '\0'; ++trv)
;
if (trv - path >= MAXPATHLEN) {
errno = ENAMETOOLONG;
return (0);
}
suffp = trv;
--trv;
if (trv < path || NULL != strchr(suffp, '/')) {
errno = EINVAL;
return (0);
}
/* Fill space with random characters */
while (trv >= path && *trv == 'X') {
if (!random(&randval)) {
/* this should never happen */
errno = EIO;
return 0;
}
randidx = randval % (sizeof(padchar) - 1);
*trv-- = padchar[randidx];
}
start = trv + 1;
/* save first combination of random characters */
memcpy(carrybuf, start, suffp - start);
/*
* check the target directory.
*/
if (doopen != NULL) {
for (; trv > path; --trv) {
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 (_stat(path, &sbuf))
return (errno == ENOENT);
/* If we have a collision, cycle through the space of filenames */
for (trv = start, carryp = carrybuf;;) {
/* have we tried all possible permutations? */
if (trv == suffp)
return (0); /* yes - exit with EEXIST */
pad = strchr(padchar, *trv);
if (pad == NULL) {
/* this should never happen */
errno = EIO;
return (0);
}
/* increment character */
*trv = (*++pad == '\0') ? padchar[0] : *pad;
/* carry to next position? */
if (*trv == *carryp) {
/* increment position and loop */
++trv;
++carryp;
} else {
/* try with new name */
break;
}
}
}
/*NOTREACHED*/
}
static int random(uint32_t *value)
{
/* This handle is never released. Windows will clean up when the process
* exits. Python takes this approach when emulating /dev/urandom, and if
* it's good enough for them, then it's good enough for us. */
static HCRYPTPROV context = 0;
if (context == 0)
if (!CryptAcquireContext(
&context, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
return 0;
if (!CryptGenRandom(context, sizeof *value, (BYTE *)value))
return 0;
return 1;
}
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