mktemp.c

Apache V2.0.15 Alpha For Linuxhttpd-2_0_15-alpha.tar.Z

/*
 * 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.
 */

#include "fileio.h" /* prototype of apr_mkstemp() */

#ifndef HAVE_MKSTEMP

#ifndef __warn_references
#define __warn_references(a,b) 
#endif
#ifdef  SVR4
#include <inttypes.h>
#define arc4random() rand()
#define seedrandom(a) srand(a)
#else
#include <stdint.h>
#define arc4random() random()
#define seedrandom(a) srandom(a)
#endif
#define _open(a,b,c) open(a,b,c)

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
  "$FreeBSD: src/lib/libc/stdio/mktemp.c,v 1.19.2.1 2001/01/20 09:35:24 kris 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 <string.h>
#include <ctype.h>
#include <unistd.h>

#ifdef  SVR4
/* arrange to compile it on my machine */
char *_mktemp(char *);
#else
char *_mktemp __P((char *));
static int _gettemp (char *, int *, int, int);
#endif


static const unsigned char padchar[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static uint32_t randseed=0;

#ifdef APR_STARTS_USING_IT
int
mkstemps(path, slen)
	char *path;
	int slen;
{
	int fd;

	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}
#endif /* APR_STARTS_USING_IT */

int apr_mkstemp(char *path)
{
	int fd;

	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
}

#ifdef APR_STARTS_USING_IT
char *
mkdtemp(path)
	char *path;
{
	return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
}

char *
_mktemp(path)
	char *path;
{
	return(_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
}

__warn_references(mktemp,
    "warning: mktemp() possibly used unsafely; consider using mkstemp()");

char *
mktemp(path)
	char *path;
{
	return(_mktemp(path));
}
#endif /* APR_STARTS_USING_IT */

static int
_gettemp(path, doopen, domkdir, slen)
	char *path;
	register int *doopen;
	int domkdir;
	int slen;
{
	register char *start, *trv, *suffp;
	char *pad;
	struct stat sbuf;
	int rval;
	uint32_t randnum;

	if (doopen && domkdir) {
		errno = EINVAL;
		return(0);
	}
	if (randseed==0) {
		randseed = time(NULL);
		seedrandom(randseed);
	}

	for (trv = path; *trv; ++trv)
		;
	trv -= slen;
	suffp = trv;
	--trv;
	if (trv < path) {
		errno = EINVAL;
		return (0);
	}

	/* Fill space with random characters */
	while (*trv == 'X') {
		randnum = arc4random() % (sizeof(padchar) - 1);
		*trv-- = padchar[randnum];
	}
	start = trv + 1;

	/*
	 * check the target directory.
	 */
	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 (;;) {
		errno = 0;
		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);

		/* If we have a collision, cycle through the space of filenames */
		for (trv = start;;) {
			if (*trv == '\0' || trv == suffp)
				return(0);
			pad = strchr((char *)padchar, *trv);
			if (pad == NULL || !*++pad)
				*trv++ = padchar[0];
			else {
				*trv++ = *pad;
				break;
			}
		}
	}
	/*NOTREACHED*/
}

#else

#if APR_HAVE_STDLIB_H
#include <stdlib.h> /* for mkstemp() - Single Unix */
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h> /* for mkstemp() - FreeBSD */
#endif

int apr_mkstemp(char *template)
{
    return mkstemp(template);
}

#endif /* !defined(HAVE_MKSTEMP) */