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d74671e4 | 1 | /* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */ |
2 | ||
8efc0c15 | 3 | /* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */ |
4 | /* Changes: Removed mktemp */ | |
5 | ||
6 | /* | |
7 | * Copyright (c) 1987, 1993 | |
8 | * The Regents of the University of California. All rights reserved. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
3e67f7df | 18 | * 3. Neither the name of the University nor the names of its contributors |
8efc0c15 | 19 | * may be used to endorse or promote products derived from this software |
20 | * without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | */ | |
34 | ||
0b65b628 | 35 | #include "includes.h" |
beb43d31 | 36 | |
70e7d0b0 | 37 | #if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) |
beb43d31 | 38 | |
8efc0c15 | 39 | #if defined(LIBC_SCCS) && !defined(lint) |
3e67f7df | 40 | static char rcsid[] = "$OpenBSD: mktemp.c,v 1.17 2003/06/02 20:18:37 millert Exp $"; |
8efc0c15 | 41 | #endif /* LIBC_SCCS and not lint */ |
42 | ||
3c62e7eb | 43 | #ifdef HAVE_CYGWIN |
44 | #define open binary_open | |
45 | extern int binary_open(); | |
46 | #endif | |
47 | ||
4cca272e | 48 | static int _gettemp(char *, int *, int, int); |
8efc0c15 | 49 | |
50 | int | |
51 | mkstemps(path, slen) | |
52 | char *path; | |
53 | int slen; | |
54 | { | |
55 | int fd; | |
56 | ||
57 | return (_gettemp(path, &fd, 0, slen) ? fd : -1); | |
58 | } | |
59 | ||
60 | int | |
61 | mkstemp(path) | |
62 | char *path; | |
63 | { | |
64 | int fd; | |
65 | ||
66 | return (_gettemp(path, &fd, 0, 0) ? fd : -1); | |
67 | } | |
68 | ||
69 | char * | |
70 | mkdtemp(path) | |
71 | char *path; | |
72 | { | |
73 | return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); | |
74 | } | |
75 | ||
76 | static int | |
77 | _gettemp(path, doopen, domkdir, slen) | |
78 | char *path; | |
79 | register int *doopen; | |
80 | int domkdir; | |
81 | int slen; | |
82 | { | |
83 | register char *start, *trv, *suffp; | |
84 | struct stat sbuf; | |
1656cbed | 85 | int rval; |
86 | pid_t pid; | |
8efc0c15 | 87 | |
88 | if (doopen && domkdir) { | |
89 | errno = EINVAL; | |
90 | return(0); | |
91 | } | |
92 | ||
93 | for (trv = path; *trv; ++trv) | |
94 | ; | |
95 | trv -= slen; | |
96 | suffp = trv; | |
97 | --trv; | |
98 | if (trv < path) { | |
99 | errno = EINVAL; | |
100 | return (0); | |
101 | } | |
102 | pid = getpid(); | |
ac8802eb | 103 | while (trv >= path && *trv == 'X' && pid != 0) { |
8efc0c15 | 104 | *trv-- = (pid % 10) + '0'; |
105 | pid /= 10; | |
106 | } | |
ac8802eb | 107 | while (trv >= path && *trv == 'X') { |
8efc0c15 | 108 | char c; |
109 | ||
110 | pid = (arc4random() & 0xffff) % (26+26); | |
111 | if (pid < 26) | |
112 | c = pid + 'A'; | |
113 | else | |
114 | c = (pid - 26) + 'a'; | |
115 | *trv-- = c; | |
116 | } | |
117 | start = trv + 1; | |
118 | ||
119 | /* | |
120 | * check the target directory; if you have six X's and it | |
121 | * doesn't exist this runs for a *very* long time. | |
122 | */ | |
123 | if (doopen || domkdir) { | |
124 | for (;; --trv) { | |
125 | if (trv <= path) | |
126 | break; | |
127 | if (*trv == '/') { | |
128 | *trv = '\0'; | |
129 | rval = stat(path, &sbuf); | |
130 | *trv = '/'; | |
131 | if (rval != 0) | |
132 | return(0); | |
133 | if (!S_ISDIR(sbuf.st_mode)) { | |
134 | errno = ENOTDIR; | |
135 | return(0); | |
136 | } | |
137 | break; | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | for (;;) { | |
143 | if (doopen) { | |
144 | if ((*doopen = | |
145 | 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 ? 1 : 0); | |
156 | ||
157 | /* tricky little algorithm for backward compatibility */ | |
158 | for (trv = start;;) { | |
159 | if (!*trv) | |
160 | return (0); | |
161 | if (*trv == 'Z') { | |
162 | if (trv == suffp) | |
163 | return (0); | |
164 | *trv++ = 'a'; | |
165 | } else { | |
166 | if (isdigit(*trv)) | |
167 | *trv = 'a'; | |
168 | else if (*trv == 'z') /* inc from z to A */ | |
169 | *trv = 'A'; | |
170 | else { | |
171 | if (trv == suffp) | |
172 | return (0); | |
173 | ++*trv; | |
174 | } | |
175 | break; | |
176 | } | |
177 | } | |
178 | } | |
179 | /*NOTREACHED*/ | |
180 | } | |
fb723d82 | 181 | |
70e7d0b0 | 182 | #endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */ |