GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/stdio/mktemp.c Lines: 0 44 0.0 %
Date: 2017-11-13 Branches: 0 36 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: mktemp.c,v 1.38 2015/09/13 08:31:47 guenther Exp $ */
2
/*
3
 * Copyright (c) 1996-1998, 2008 Theo de Raadt
4
 * Copyright (c) 1997, 2008-2009 Todd C. Miller
5
 *
6
 * Permission to use, copy, modify, and distribute this software for any
7
 * purpose with or without fee is hereby granted, provided that the above
8
 * copyright notice and this permission notice appear in all copies.
9
 *
10
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
 */
18
19
#include <sys/types.h>
20
#include <sys/stat.h>
21
#include <errno.h>
22
#include <fcntl.h>
23
#include <limits.h>
24
#include <stdio.h>
25
#include <stdlib.h>
26
#include <string.h>
27
#include <ctype.h>
28
#include <unistd.h>
29
30
#define MKTEMP_NAME	0
31
#define MKTEMP_FILE	1
32
#define MKTEMP_DIR	2
33
34
#define TEMPCHARS	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
35
#define NUM_CHARS	(sizeof(TEMPCHARS) - 1)
36
#define MIN_X		6
37
38
#define MKOTEMP_FLAGS	(O_APPEND | O_CLOEXEC | O_DSYNC | O_RSYNC | O_SYNC)
39
40
#ifndef nitems
41
#define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
42
#endif
43
44
static int
45
mktemp_internal(char *path, int slen, int mode, int flags)
46
{
47
	char *start, *cp, *ep;
48
	const char tempchars[] = TEMPCHARS;
49
	unsigned int tries;
50
	struct stat sb;
51
	size_t len;
52
	int fd;
53
54
	len = strlen(path);
55
	if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
56
		errno = EINVAL;
57
		return(-1);
58
	}
59
	ep = path + len - slen;
60
61
	for (start = ep; start > path && start[-1] == 'X'; start--)
62
		;
63
	if (ep - start < MIN_X) {
64
		errno = EINVAL;
65
		return(-1);
66
	}
67
68
	if (flags & ~MKOTEMP_FLAGS) {
69
		errno = EINVAL;
70
		return(-1);
71
	}
72
	flags |= O_CREAT | O_EXCL | O_RDWR;
73
74
	tries = INT_MAX;
75
	do {
76
		cp = start;
77
		do {
78
			unsigned short rbuf[16];
79
			unsigned int i;
80
81
			/*
82
			 * Avoid lots of arc4random() calls by using
83
			 * a buffer sized for up to 16 Xs at a time.
84
			 */
85
			arc4random_buf(rbuf, sizeof(rbuf));
86
			for (i = 0; i < nitems(rbuf) && cp != ep; i++)
87
				*cp++ = tempchars[rbuf[i] % NUM_CHARS];
88
		} while (cp != ep);
89
90
		switch (mode) {
91
		case MKTEMP_NAME:
92
			if (lstat(path, &sb) != 0)
93
				return(errno == ENOENT ? 0 : -1);
94
			break;
95
		case MKTEMP_FILE:
96
			fd = open(path, flags, S_IRUSR|S_IWUSR);
97
			if (fd != -1 || errno != EEXIST)
98
				return(fd);
99
			break;
100
		case MKTEMP_DIR:
101
			if (mkdir(path, S_IRUSR|S_IWUSR|S_IXUSR) == 0)
102
				return(0);
103
			if (errno != EEXIST)
104
				return(-1);
105
			break;
106
		}
107
	} while (--tries);
108
109
	errno = EEXIST;
110
	return(-1);
111
}
112
113
char *
114
_mktemp(char *path)
115
{
116
	if (mktemp_internal(path, 0, MKTEMP_NAME, 0) == -1)
117
		return(NULL);
118
	return(path);
119
}
120
121
__warn_references(mktemp,
122
    "warning: mktemp() possibly used unsafely; consider using mkstemp()");
123
124
char *
125
mktemp(char *path)
126
{
127
	return(_mktemp(path));
128
}
129
130
int
131
mkostemps(char *path, int slen, int flags)
132
{
133
	return(mktemp_internal(path, slen, MKTEMP_FILE, flags));
134
}
135
136
int
137
mkstemp(char *path)
138
{
139
	return(mktemp_internal(path, 0, MKTEMP_FILE, 0));
140
}
141
DEF_WEAK(mkstemp);
142
143
int
144
mkostemp(char *path, int flags)
145
{
146
	return(mktemp_internal(path, 0, MKTEMP_FILE, flags));
147
}
148
DEF_WEAK(mkostemp);
149
150
int
151
mkstemps(char *path, int slen)
152
{
153
	return(mktemp_internal(path, slen, MKTEMP_FILE, 0));
154
}
155
156
char *
157
mkdtemp(char *path)
158
{
159
	int error;
160
161
	error = mktemp_internal(path, 0, MKTEMP_DIR, 0);
162
	return(error ? NULL : path);
163
}