1 /*
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37 #include <fcntl.h>
38 #include <errno.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <ctype.h>
43 #include <unistd.h>
44 #include <stdint.h>
45
46 #include <errno_private.h>
47
48
49 static int _gettemp(char *, int *, int, int, int);
50
51 static const char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
52
53
54 int
mkstemps(char * path,int slen)55 mkstemps(char *path, int slen)
56 {
57 int fd;
58 return _gettemp(path, &fd, 0, slen, 0) ? fd : -1;
59 }
60
61
62 int
mkstemp(char * path)63 mkstemp(char *path)
64 {
65 int fd;
66 if (_gettemp(path, &fd, 0, 0, 0))
67 return fd;
68
69 return -1;
70 }
71
72
73 int
mkostemp(char * path,int oflags)74 mkostemp(char *path, int oflags)
75 {
76 int fd;
77 if (_gettemp(path, &fd, 0, 0, oflags))
78 return fd;
79
80 return -1;
81 }
82
83
84 char *
mkdtemp(path)85 mkdtemp(path)
86 char *path;
87 {
88 return (_gettemp(path, (int *)NULL, 1, 0, 0) ? path : (char *)NULL);
89 }
90
91
92 char *
mktemp(char * path)93 mktemp(char *path)
94 {
95 if (_gettemp(path, (int *)NULL, 0, 0, 0))
96 return path;
97
98 return NULL;
99 }
100
101
102 static int
_gettemp(char * path,int * doopen,int domkdir,int slen,int oflags)103 _gettemp(char *path, int *doopen, int domkdir, int slen, int oflags)
104 {
105 char *start, *trv, *suffp;
106 char *pad;
107 struct stat sbuf;
108 int rval;
109 static unsigned int seed = 0;
110
111 if (doopen != NULL && domkdir) {
112 __set_errno(EINVAL);
113 return 0;
114 }
115
116 for (trv = path; *trv != '\0'; ++trv)
117 ;
118
119 trv -= slen;
120 suffp = trv;
121 --trv;
122 if (trv < path) {
123 __set_errno(EINVAL);
124 return 0;
125 }
126
127 /* Fill space with random characters */
128 if (seed == 0) {
129 /* Select a pseudo-random seed on first call to avoid
130 to generate the same sequence of pattern */
131 struct timeval tv;
132 gettimeofday(&tv, 0);
133 seed = (getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec;
134 }
135 while (trv >= path && *trv == 'X') {
136 uint32_t value = rand_r(&seed) % (sizeof(padchar) - 1);
137 *trv-- = padchar[value];
138 }
139 start = trv + 1;
140
141 /*
142 * check the target directory.
143 */
144 if (doopen != NULL || domkdir) {
145 for (; trv > path; --trv) {
146 if (*trv == '/') {
147 *trv = '\0';
148 rval = stat(path, &sbuf);
149 *trv = '/';
150 if (rval != 0)
151 return 0;
152 if (!S_ISDIR(sbuf.st_mode)) {
153 __set_errno(ENOTDIR);
154 return 0;
155 }
156 break;
157 }
158 }
159 }
160
161 for (;;) {
162 if (doopen) {
163 if ((*doopen = open(path, O_CREAT | O_EXCL | O_RDWR | oflags, 0600)) >= 0)
164 return 1;
165 if (errno != EEXIST)
166 return 0;
167 } else if (domkdir) {
168 if (mkdir(path, 0700) == 0)
169 return 1;
170 if (errno != EEXIST)
171 return 0;
172 } else if (lstat(path, &sbuf))
173 return errno == ENOENT;
174
175 /* If we have a collision, cycle through the space of filenames */
176 for (trv = start;;) {
177 if (*trv == '\0' || trv == suffp)
178 return 0;
179 pad = strchr(padchar, *trv);
180 if (pad == NULL || *++pad == '\0')
181 *trv++ = padchar[0];
182 else {
183 *trv++ = *pad;
184 break;
185 }
186 }
187 }
188
189 /* not reached */
190 }
191