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 <fcntl.h>
37#include <errno.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <ctype.h>
42#include <unistd.h>
43#include <stdint.h>
44
45#include <errno_private.h>
46
47
48static int _gettemp(char *, int *, int, int);
49
50static const unsigned char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
51
52
53#if 0
54int
55mkstemps(char *path, int slen)
56{
57	int fd;
58	return _gettemp(path, &fd, 0, slen) ? fd : -1;
59}
60#endif
61
62
63int
64mkstemp(char *path)
65{
66	int fd;
67	if (_gettemp(path, &fd, 0, 0))
68		return fd;
69
70	return -1;
71}
72
73
74char *
75mkdtemp(path)
76	char *path;
77{
78	return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
79}
80
81
82char *
83mktemp(char *path)
84{
85	if (_gettemp(path, (int *)NULL, 0, 0))
86		return path;
87
88	return NULL;
89}
90
91
92static int
93_gettemp(char *path, int *doopen, int domkdir, int slen)
94{
95	char *start, *trv, *suffp;
96	char *pad;
97	struct stat sbuf;
98	int rval;
99
100	if (doopen != NULL && domkdir) {
101		__set_errno(EINVAL);
102		return 0;
103	}
104
105	for (trv = path; *trv != '\0'; ++trv)
106		;
107
108	trv -= slen;
109	suffp = trv;
110	--trv;
111	if (trv < path) {
112		__set_errno(EINVAL);
113		return 0;
114	}
115
116	/* Fill space with random characters */
117	while (trv >= path && *trv == 'X') {
118		uint32_t value = rand() % (sizeof(padchar) - 1);
119		*trv-- = padchar[value];
120	}
121	start = trv + 1;
122
123	/*
124	 * check the target directory.
125	 */
126	if (doopen != NULL || domkdir) {
127		for (; trv > path; --trv) {
128			if (*trv == '/') {
129				*trv = '\0';
130				rval = stat(path, &sbuf);
131				*trv = '/';
132				if (rval != 0)
133					return 0;
134				if (!S_ISDIR(sbuf.st_mode)) {
135					__set_errno(ENOTDIR);
136					return 0;
137				}
138				break;
139			}
140		}
141	}
142
143	for (;;) {
144		if (doopen) {
145			if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
146				return 1;
147			if (errno != EEXIST)
148				return 0;
149		} else if (domkdir) {
150			if (mkdir(path, 0700) == 0)
151				return 1;
152			if (errno != EEXIST)
153				return 0;
154		} else if (lstat(path, &sbuf))
155			return errno == ENOENT;
156
157		/* If we have a collision, cycle through the space of filenames */
158		for (trv = start;;) {
159			if (*trv == '\0' || trv == suffp)
160				return 0;
161			pad = strchr(padchar, *trv);
162			if (pad == NULL || *++pad == '\0')
163				*trv++ = padchar[0];
164			else {
165				*trv++ = *pad;
166				break;
167			}
168		}
169	}
170
171	/* not reached */
172}
173