1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/* $OpenBSD: mktemp.c,v 1.27 2009/03/20 16:05:11 millert Exp $ */
/*
* Copyright (c) 1996-1998, 2008 Theo de Raadt
* Copyright (c) 1997, 2008-2009 Todd C. Miller
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#define MKTEMP_NAME 0
#define MKTEMP_FILE 1
#define MKTEMP_DIR 2
#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
static int
mktemp_internal(char *path, int slen, int mode)
{
char *start, *cp, *ep;
const char *tempchars = TEMPCHARS;
unsigned int r, tries;
struct stat sb;
size_t len;
int fd;
if (*path == '\0') {
errno = EINVAL;
return(-1);
}
len = strlen(path);
if (len == 0 || slen >= len) {
errno = EINVAL;
return(-1);
}
ep = path + len - slen;
tries = 1;
for (start = ep; start >= path && *--start == 'X';) {
if (tries < INT_MAX / NUM_CHARS)
tries *= NUM_CHARS;
}
tries *= 2;
start++;
do {
for (cp = start; cp != ep; cp++) {
r = arc4random_uniform(NUM_CHARS);
*cp = tempchars[r];
}
switch (mode) {
case MKTEMP_NAME:
if (lstat(path, &sb) != 0)
return(errno == ENOENT ? 0 : -1);
break;
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_IRUSR|S_IWUSR|S_IXUSR) == 0)
return(0);
if (errno != EEXIST)
return(-1);
break;
}
} while (--tries);
return(-1);
}
char *_mktemp(char *);
char *
_mktemp(char *path)
{
if (mktemp_internal(path, 0, MKTEMP_NAME) == -1)
return(NULL);
return(path);
}
__warn_references(mktemp,
"warning: mktemp() possibly used unsafely; consider using mkstemp()");
char *
mktemp(char *path)
{
return(_mktemp(path));
}
int
mkstemp(char *path)
{
return(mktemp_internal(path, 0, MKTEMP_FILE));
}
int
mkstemps(char *path, int slen)
{
return(mktemp_internal(path, slen, MKTEMP_FILE));
}
char *
mkdtemp(char *path)
{
int error;
error = mktemp_internal(path, 0, MKTEMP_DIR);
return(error ? NULL : path);
}
|