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Commit | Line | Data |
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5c288d43 CF |
1 | /* mktemp.cc: mktemp functions |
2 | ||
e5f37aa1 | 3 | This file is adapted for Cygwin from FreeBSD and newlib. |
5c288d43 CF |
4 | |
5 | See the copyright at the bottom of this file. */ | |
6 | ||
cb3f5f08 CF |
7 | #include "winsup.h" |
8 | #include "cygerrno.h" | |
cb3f5f08 | 9 | #include <fcntl.h> |
e5f37aa1 | 10 | #include <sys/stat.h> |
cb3f5f08 CF |
11 | #include <unistd.h> |
12 | ||
3083fa94 | 13 | static int _gettemp(char *, int *, int, size_t, int); |
cb3f5f08 CF |
14 | static uint32_t arc4random (); |
15 | ||
16 | static const char padchar[] = | |
17 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
18 | ||
19 | extern "C" int | |
20 | mkstemp(char *path) | |
21 | { | |
22 | int fd; | |
3083fa94 | 23 | return _gettemp(path, &fd, 0, 0, O_BINARY) ? fd : -1; |
cb3f5f08 CF |
24 | } |
25 | ||
26 | extern "C" char * | |
27 | mkdtemp(char *path) | |
28 | { | |
3083fa94 | 29 | return _gettemp(path, NULL, 1, 0, 0) ? path : NULL; |
e5f37aa1 CV |
30 | } |
31 | ||
32 | extern "C" int | |
33 | mkstemps(char *path, int len) | |
34 | { | |
35 | int fd; | |
3083fa94 EB |
36 | return _gettemp(path, &fd, 0, len, O_BINARY) ? fd : -1; |
37 | } | |
38 | ||
39 | extern "C" int | |
40 | mkostemp(char *path, int flags) | |
41 | { | |
42 | int fd; | |
43 | return _gettemp(path, &fd, 0, 0, flags & ~O_ACCMODE) ? fd : -1; | |
44 | } | |
45 | ||
46 | extern "C" int | |
47 | mkostemps(char *path, int len, int flags) | |
48 | { | |
49 | int fd; | |
50 | return _gettemp(path, &fd, 0, len, flags & ~O_ACCMODE) ? fd : -1; | |
cb3f5f08 CF |
51 | } |
52 | ||
cb3f5f08 CF |
53 | extern "C" char * |
54 | mktemp(char *path) | |
55 | { | |
3083fa94 | 56 | return _gettemp(path, NULL, 0, 0, 0) ? path : (char *) NULL; |
cb3f5f08 CF |
57 | } |
58 | ||
59 | static int | |
3083fa94 | 60 | _gettemp(char *path, int *doopen, int domkdir, size_t suffixlen, int flags) |
cb3f5f08 CF |
61 | { |
62 | char *start, *trv, *suffp; | |
63 | char *pad; | |
64 | ||
65 | if (doopen && domkdir) | |
66 | { | |
67 | set_errno (EINVAL); | |
68 | return 0; | |
69 | } | |
70 | ||
e5f37aa1 CV |
71 | trv = strchr (path, '\0'); |
72 | if ((size_t) (trv - path) < suffixlen) | |
cb3f5f08 CF |
73 | { |
74 | set_errno (EINVAL); | |
75 | return 0; | |
76 | } | |
e5f37aa1 CV |
77 | trv -= suffixlen; |
78 | suffp = trv--; | |
cb3f5f08 CF |
79 | |
80 | /* Fill space with random characters */ | |
81 | while (trv >= path && *trv == 'X') | |
82 | { | |
83 | uint32_t rand = arc4random () % (sizeof (padchar) - 1); | |
84 | *trv-- = padchar[rand]; | |
85 | } | |
e5f37aa1 CV |
86 | if (suffp - trv < 6) |
87 | { | |
88 | set_errno (EINVAL); | |
89 | return 0; | |
90 | } | |
cb3f5f08 CF |
91 | start = trv + 1; |
92 | ||
93 | /* | |
94 | * check the target directory. | |
95 | */ | |
61522196 | 96 | struct stat sbuf; |
cb3f5f08 CF |
97 | if (doopen != NULL || domkdir) |
98 | { | |
99 | for (; trv > path; trv--) | |
100 | { | |
101 | if (*trv == '/') | |
102 | { | |
103 | *trv = '\0'; | |
104 | int rval = stat64 (path, &sbuf); | |
105 | *trv = '/'; | |
106 | if (rval != 0) | |
107 | return 0; | |
108 | if (!S_ISDIR (sbuf.st_mode)) | |
109 | { | |
110 | set_errno (ENOTDIR); | |
111 | return 0; | |
112 | } | |
113 | break; | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
118 | for (;;) | |
119 | { | |
120 | if (doopen) | |
121 | { | |
3083fa94 | 122 | if ((*doopen = open (path, O_CREAT | O_EXCL | O_RDWR | flags, |
d1efa4e8 | 123 | S_IRUSR | S_IWUSR)) >= 0) |
cb3f5f08 CF |
124 | return 1; |
125 | if (errno != EEXIST) | |
126 | return 0; | |
127 | } | |
128 | else if (domkdir) | |
129 | { | |
130 | if (mkdir (path, 0700) == 0) | |
131 | return 1; | |
132 | if (errno != EEXIST) | |
133 | return 0; | |
134 | } | |
135 | else if (lstat64 (path, &sbuf)) | |
136 | return errno == ENOENT; | |
137 | ||
138 | /* If we have a collision, cycle through the space of filenames */ | |
139 | for (trv = start;;) | |
140 | { | |
141 | if (*trv == '\0' || trv == suffp) | |
142 | return 0; | |
143 | pad = strchr (padchar, *trv); | |
144 | if (pad == NULL || *++pad == '\0') | |
145 | *trv++ = padchar[0]; | |
146 | else | |
147 | { | |
148 | *trv++ = *pad; | |
149 | break; | |
150 | } | |
151 | } | |
152 | } | |
153 | /*NOTREACHED*/ | |
154 | } | |
155 | ||
156 | static uint32_t | |
157 | arc4random () | |
158 | { | |
159 | union | |
160 | { | |
161 | uint32_t rand; | |
162 | char buf[sizeof (int) / 8]; | |
163 | } r; | |
164 | int fd = open ("/dev/urandom", O_RDONLY); | |
165 | read (fd, r.buf, 4); | |
166 | close (fd); | |
167 | return r.rand; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Copyright (c) 1987, 1993 | |
172 | * The Regents of the University of California. All rights reserved. | |
173 | * | |
174 | * Redistribution and use in source and binary forms, with or without | |
175 | * modification, are permitted provided that the following conditions | |
176 | * are met: | |
177 | * 1. Redistributions of source code must retain the above copyright | |
178 | * notice, this list of conditions and the following disclaimer. | |
179 | * 2. Redistributions in binary form must reproduce the above copyright | |
180 | * notice, this list of conditions and the following disclaimer in the | |
181 | * documentation and/or other materials provided with the distribution. | |
cb3f5f08 CF |
182 | * 4. Neither the name of the University nor the names of its contributors |
183 | * may be used to endorse or promote products derived from this software | |
184 | * without specific prior written permission. | |
185 | * | |
186 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
187 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
188 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
189 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
190 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
191 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
192 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
193 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
194 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
195 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
196 | * SUCH DAMAGE. | |
197 | */ |