190 lines
4.0 KiB
C
190 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 2001, 2003, 2004, 2008-2011, 2013, 2015
|
|
* Todd C. Miller <Todd.Miller@courtesan.com>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#if !defined(HAVE_MKSTEMPS) || !defined(HAVE_MKDTEMP)
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#ifdef HAVE_STDLIB_H
|
|
# include <stdlib.h>
|
|
#endif /* HAVE_STDLIB_H */
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif /* HAVE_STRING_H */
|
|
#ifdef HAVE_STRINGS_H
|
|
# include <strings.h>
|
|
#endif /* HAVE_STRINGS_H */
|
|
#include <ctype.h>
|
|
#include <unistd.h>
|
|
#ifdef TIME_WITH_SYS_TIME
|
|
# include <time.h>
|
|
#endif
|
|
|
|
#include "sudo_compat.h"
|
|
|
|
#define MKTEMP_FILE 1
|
|
#define MKTEMP_DIR 2
|
|
|
|
#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
|
|
#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
|
|
#define MIN_X 6
|
|
|
|
#ifndef INT_MAX
|
|
#define INT_MAX 0x7fffffff
|
|
#endif
|
|
|
|
#if defined(HAVE_ARC4RANDOM)
|
|
# define RAND() arc4random()
|
|
# define SEED_T unsigned int
|
|
#elif defined(HAVE_RANDOM)
|
|
# define RAND() random()
|
|
# define SRAND(_x) srandom((_x))
|
|
# define SEED_T unsigned int
|
|
#elif defined(HAVE_LRAND48)
|
|
# define RAND() lrand48()
|
|
# define SRAND(_x) srand48((_x))
|
|
# define SEED_T long
|
|
#else
|
|
# define RAND() rand()
|
|
# define SRAND(_x) srand((_x))
|
|
# define SEED_T unsigned int
|
|
#endif
|
|
|
|
static void
|
|
seed_random(void)
|
|
{
|
|
#ifdef SRAND
|
|
struct timeval tv;
|
|
SEED_T seed;
|
|
int fd;
|
|
|
|
/*
|
|
* Seed from /dev/urandom if possible.
|
|
*/
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
if (fd != -1) {
|
|
ssize_t nread;
|
|
|
|
do {
|
|
nread = read(fd, &seed, sizeof(seed));
|
|
} while (nread == -1 && errno == EINTR);
|
|
close(fd);
|
|
if (nread != (ssize_t)sizeof(seed))
|
|
fd = -1;
|
|
}
|
|
|
|
/*
|
|
* If no /dev/urandom, seed from time of day and process id
|
|
* multiplied by small primes.
|
|
*/
|
|
if (fd == -1) {
|
|
(void) gettimeofday(&tv, NULL);
|
|
seed = (tv.tv_sec % 10000) * 523 + tv.tv_usec * 13 +
|
|
(getpid() % 1000) * 983;
|
|
}
|
|
SRAND(seed);
|
|
#endif
|
|
}
|
|
|
|
static unsigned int
|
|
get_random(void)
|
|
{
|
|
static int initialized;
|
|
|
|
if (!initialized) {
|
|
seed_random();
|
|
initialized = 1;
|
|
}
|
|
|
|
return RAND() & 0xffffffff;
|
|
}
|
|
|
|
static int
|
|
mktemp_internal(char *path, int slen, int mode)
|
|
{
|
|
char *start, *cp, *ep;
|
|
const char tempchars[] = TEMPCHARS;
|
|
unsigned int r, tries;
|
|
size_t len;
|
|
int fd;
|
|
|
|
len = strlen(path);
|
|
if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
ep = path + len - slen;
|
|
|
|
tries = 1;
|
|
for (start = ep; start > path && start[-1] == 'X'; start--) {
|
|
if (tries < INT_MAX / NUM_CHARS)
|
|
tries *= NUM_CHARS;
|
|
}
|
|
tries *= 2;
|
|
if (ep - start < MIN_X) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
do {
|
|
for (cp = start; cp != ep; cp++) {
|
|
r = get_random() % NUM_CHARS;
|
|
*cp = tempchars[r];
|
|
}
|
|
|
|
switch (mode) {
|
|
case MKTEMP_FILE:
|
|
fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
|
|
if (fd != -1 || errno != EEXIST)
|
|
return fd;
|
|
break;
|
|
case MKTEMP_DIR:
|
|
if (mkdir(path, S_IRWXU) == 0)
|
|
return 0;
|
|
if (errno != EEXIST)
|
|
return -1;
|
|
break;
|
|
}
|
|
} while (--tries);
|
|
|
|
errno = EEXIST;
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
sudo_mkstemps(char *path, int slen)
|
|
{
|
|
return mktemp_internal(path, slen, MKTEMP_FILE);
|
|
}
|
|
|
|
char *
|
|
sudo_mkdtemp(char *path)
|
|
{
|
|
if (mktemp_internal(path, 0, MKTEMP_DIR) == -1)
|
|
return NULL;
|
|
return path;
|
|
}
|
|
#endif /* !HAVE_MKSTEMPS || !HAVE_MKDTEMP */
|