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mktemp.c

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1/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */-
2/* Changes: Removed mktemp */-
3-
4/* $OpenBSD: mktemp.c,v 1.30 2010/03/21 23:09:30 schwarze Exp $ */-
5/*-
6 * Copyright (c) 1996-1998, 2008 Theo de Raadt-
7 * Copyright (c) 1997, 2008-2009 Todd C. Miller-
8 *-
9 * Permission to use, copy, modify, and distribute this software for any-
10 * purpose with or without fee is hereby granted, provided that the above-
11 * copyright notice and this permission notice appear in all copies.-
12 *-
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES-
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF-
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR-
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES-
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN-
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF-
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.-
20 */-
21-
22/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */-
23-
24#include "includes.h"-
25-
26#include <sys/types.h>-
27#include <sys/stat.h>-
28#include <errno.h>-
29#include <fcntl.h>-
30#include <limits.h>-
31#include <stdio.h>-
32#include <stdlib.h>-
33#include <string.h>-
34#include <ctype.h>-
35#include <unistd.h>-
36-
37#if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP)-
38-
39#define MKTEMP_NAME 0-
40#define MKTEMP_FILE 1-
41#define MKTEMP_DIR 2-
42-
43#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"-
44#define NUM_CHARS (sizeof(TEMPCHARS) - 1)-
45-
46static int-
47mktemp_internal(char *path, int slen, int mode)-
48{-
49 char *start, *cp, *ep;-
50 const char *tempchars = TEMPCHARS;-
51 unsigned int r, tries;-
52 struct stat sb;-
53 size_t len;-
54 int fd;-
55-
56 len = strlen(path);-
57 if (len == 0 || slen < 0 || (size_t)slen >= len) {
len == 0Description
TRUEnever evaluated
FALSEnever evaluated
slen < 0Description
TRUEnever evaluated
FALSEnever evaluated
(size_t)slen >= lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
58 errno = EINVAL;-
59 return(-1);
never executed: return(-1);
0
60 }-
61 ep = path + len - slen;-
62-
63 tries = 1;-
64 for (start = ep; start > path && start[-1] == 'X'; start--) {
start > pathDescription
TRUEnever evaluated
FALSEnever evaluated
start[-1] == 'X'Description
TRUEnever evaluated
FALSEnever evaluated
0
65 if (tries < INT_MAX / NUM_CHARS)
tries < 0x7fff...3456789") - 1)Description
TRUEnever evaluated
FALSEnever evaluated
0
66 tries *= NUM_CHARS;
never executed: tries *= (sizeof("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") - 1);
0
67 }
never executed: end of block
0
68 tries *= 2;-
69-
70 do {-
71 for (cp = start; cp != ep; cp++) {
cp != epDescription
TRUEnever evaluated
FALSEnever evaluated
0
72 r = arc4random_uniform(NUM_CHARS);-
73 *cp = tempchars[r];-
74 }
never executed: end of block
0
75-
76 switch (mode) {-
77 case MKTEMP_NAME:
never executed: case 0:
0
78 if (lstat(path, &sb) != 0)
lstat(path, &sb) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
79 return(errno == ENOENT ? 0 : -1);
never executed: return( (*__errno_location ()) == 2 ? 0 : -1);
(*__errno_location ()) == 2Description
TRUEnever evaluated
FALSEnever evaluated
0
80 break;
never executed: break;
0
81 case MKTEMP_FILE:
never executed: case 1:
0
82 fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);-
83 if (fd != -1 || errno != EEXIST)
fd != -1Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) != 17Description
TRUEnever evaluated
FALSEnever evaluated
0
84 return(fd);
never executed: return(fd);
0
85 break;
never executed: break;
0
86 case MKTEMP_DIR:
never executed: case 2:
0
87 if (mkdir(path, S_IRUSR|S_IWUSR|S_IXUSR) == 0)
mkdir(path, 04... | 0100 ) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
88 return(0);
never executed: return(0);
0
89 if (errno != EEXIST)
(*__errno_location ()) != 17Description
TRUEnever evaluated
FALSEnever evaluated
0
90 return(-1);
never executed: return(-1);
0
91 break;
never executed: break;
0
92 }-
93 } while (--tries);
never executed: end of block
--triesDescription
TRUEnever evaluated
FALSEnever evaluated
0
94-
95 errno = EEXIST;-
96 return(-1);
never executed: return(-1);
0
97}-
98-
99#if 0-
100char *_mktemp(char *);-
101-
102char *-
103_mktemp(char *path)-
104{-
105 if (mktemp_internal(path, 0, MKTEMP_NAME) == -1)-
106 return(NULL);-
107 return(path);-
108}-
109-
110__warn_references(mktemp,-
111 "warning: mktemp() possibly used unsafely; consider using mkstemp()");-
112-
113char *-
114mktemp(char *path)-
115{-
116 return(_mktemp(path));-
117}-
118#endif-
119-
120int-
121mkstemp(char *path)-
122{-
123 return(mktemp_internal(path, 0, MKTEMP_FILE));
never executed: return(mktemp_internal(path, 0, 1));
0
124}-
125-
126int-
127mkstemps(char *path, int slen)-
128{-
129 return(mktemp_internal(path, slen, MKTEMP_FILE));
never executed: return(mktemp_internal(path, slen, 1));
0
130}-
131-
132char *-
133mkdtemp(char *path)-
134{-
135 int error;-
136-
137 error = mktemp_internal(path, 0, MKTEMP_DIR);-
138 return(error ? NULL : path);
never executed: return(error ? ((void *)0) : path);
errorDescription
TRUEnever evaluated
FALSEnever evaluated
0
139}-
140-
141#endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */-
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