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/* $OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $ */
/*
* Copyright (c) 2000, 2001, 2005 Todd C. Miller <Todd.Miller@courtesan.com>
* 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.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#if defined(TIME_WITH_SYS_TIME) || defined(HAVE_SYS_TIME_H)
# include <sys/time.h>
#endif
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif /* HAVE_STDLIB_H */
#include <ctype.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include "sudo.h"
#ifndef lint
static const char rcsid[] = "$Sudo: mkstemp.c,v 1.1.2.1 2007/06/12 17:06:20 millert Exp $";
#endif /* not lint */
static unsigned int get_random __P((void));
static void seed_random __P((void));
int
mkstemp(path)
char *path;
{
char *start, *trv;
struct stat sbuf;
int fd, rval;
pid_t pid;
char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
if (*path == '\0') {
errno = EINVAL;
return (-1); /* zero length path */
}
pid = getpid();
for (trv = path; *trv; ++trv)
;
--trv;
while (trv >= path && *trv == 'X' && pid != 0) {
*trv-- = (pid % 10) + '0';
pid /= 10;
}
while (trv >= path && *trv == 'X') {
char c;
/* assumes pid_t is at least 16 bits */
pid = (get_random() & 0xffff) % (26 + 26);
c = alphabet[pid];
*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.
*/
for (;; --trv) {
if (trv <= path)
break;
if (*trv == '/') {
*trv = '\0';
rval = stat(path, &sbuf);
*trv = '/';
if (rval != 0)
return (-1);
if (!S_ISDIR(sbuf.st_mode)) {
errno = ENOTDIR;
return (-1);
}
break;
}
}
for (;;) {
if ((fd = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
return (fd);
if (errno != EEXIST)
return (-1);
/* tricky little algorithm for backward compatibility */
for (trv = start;;) {
if (!*trv)
return (-1);
if (*trv == 'Z')
*trv++ = 'a';
else {
if (isdigit((unsigned char)(*trv)))
*trv = 'a';
else if (*trv == 'z') /* wrap from z to A */
*trv = 'A';
else {
#ifdef HAVE_EBCDIC
switch(*trv) {
case 'i':
*trv = 'j';
break;
case 'r':
*trv = 's';
break;
case 'I':
*trv = 'J';
break;
case 'R':
*trv = 'S';
break;
default:
++*trv;
break;
}
#else
++*trv;
#endif
}
break;
}
}
}
/*NOTREACHED*/
}
#ifdef HAVE_RANDOM
# define RAND random
# define SRAND srandom
# define SEED_T unsigned int
#else
# ifdef HAVE_LRAND48
# define RAND lrand48
# define SRAND srand48
# define SEED_T long
# else
# define RAND rand
# define SRAND srand
# define SEED_T unsigned int
# endif
#endif
static void
seed_random()
{
SEED_T seed;
struct timespec ts;
/*
* Seed from time of day and process id multiplied by small primes.
*/
(void) gettime(&ts);
seed = (ts.tv_sec % 10000) * 523 + ts.tv_nsec / 1000 * 13 +
(getpid() % 1000) * 983;
SRAND(seed);
}
static unsigned int
get_random()
{
static int initialized;
if (!initialized) {
seed_random();
initialized = 1;
}
return(RAND() & 0xffffffff);
}
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