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cdd66111 | 1 | /* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */ |
2 | ||
3c0ef626 | 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. | |
0fff78ff | 18 | * 3. Neither the name of the University nor the names of its contributors |
3c0ef626 | 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 | ||
35 | #include "includes.h" | |
36 | ||
6a9b3198 | 37 | #if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) |
3c0ef626 | 38 | |
39 | #if defined(LIBC_SCCS) && !defined(lint) | |
0fff78ff | 40 | static char rcsid[] = "$OpenBSD: mktemp.c,v 1.17 2003/06/02 20:18:37 millert Exp $"; |
3c0ef626 | 41 | #endif /* LIBC_SCCS and not lint */ |
42 | ||
3c0ef626 | 43 | static int _gettemp(char *, int *, int, int); |
44 | ||
45 | int | |
46 | mkstemps(path, slen) | |
47 | char *path; | |
48 | int slen; | |
49 | { | |
50 | int fd; | |
51 | ||
52 | return (_gettemp(path, &fd, 0, slen) ? fd : -1); | |
53 | } | |
54 | ||
55 | int | |
56 | mkstemp(path) | |
57 | char *path; | |
58 | { | |
59 | int fd; | |
60 | ||
61 | return (_gettemp(path, &fd, 0, 0) ? fd : -1); | |
62 | } | |
63 | ||
64 | char * | |
65 | mkdtemp(path) | |
66 | char *path; | |
67 | { | |
68 | return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); | |
69 | } | |
70 | ||
71 | static int | |
72 | _gettemp(path, doopen, domkdir, slen) | |
73 | char *path; | |
74 | register int *doopen; | |
75 | int domkdir; | |
76 | int slen; | |
77 | { | |
78 | register char *start, *trv, *suffp; | |
79 | struct stat sbuf; | |
e9a17296 | 80 | int rval; |
81 | pid_t pid; | |
3c0ef626 | 82 | |
83 | if (doopen && domkdir) { | |
84 | errno = EINVAL; | |
85 | return(0); | |
86 | } | |
87 | ||
88 | for (trv = path; *trv; ++trv) | |
89 | ; | |
90 | trv -= slen; | |
91 | suffp = trv; | |
92 | --trv; | |
93 | if (trv < path) { | |
94 | errno = EINVAL; | |
95 | return (0); | |
96 | } | |
97 | pid = getpid(); | |
41b2f314 | 98 | while (trv >= path && *trv == 'X' && pid != 0) { |
3c0ef626 | 99 | *trv-- = (pid % 10) + '0'; |
100 | pid /= 10; | |
101 | } | |
41b2f314 | 102 | while (trv >= path && *trv == 'X') { |
3c0ef626 | 103 | char c; |
104 | ||
105 | pid = (arc4random() & 0xffff) % (26+26); | |
106 | if (pid < 26) | |
107 | c = pid + 'A'; | |
108 | else | |
109 | c = (pid - 26) + 'a'; | |
110 | *trv-- = c; | |
111 | } | |
112 | start = trv + 1; | |
113 | ||
114 | /* | |
115 | * check the target directory; if you have six X's and it | |
116 | * doesn't exist this runs for a *very* long time. | |
117 | */ | |
118 | if (doopen || domkdir) { | |
119 | for (;; --trv) { | |
120 | if (trv <= path) | |
121 | break; | |
122 | if (*trv == '/') { | |
123 | *trv = '\0'; | |
124 | rval = stat(path, &sbuf); | |
125 | *trv = '/'; | |
126 | if (rval != 0) | |
127 | return(0); | |
128 | if (!S_ISDIR(sbuf.st_mode)) { | |
129 | errno = ENOTDIR; | |
130 | return(0); | |
131 | } | |
132 | break; | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | for (;;) { | |
138 | if (doopen) { | |
139 | if ((*doopen = | |
140 | open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) | |
141 | return(1); | |
142 | if (errno != EEXIST) | |
143 | return(0); | |
144 | } else if (domkdir) { | |
145 | if (mkdir(path, 0700) == 0) | |
146 | return(1); | |
147 | if (errno != EEXIST) | |
148 | return(0); | |
149 | } else if (lstat(path, &sbuf)) | |
150 | return(errno == ENOENT ? 1 : 0); | |
151 | ||
152 | /* tricky little algorithm for backward compatibility */ | |
153 | for (trv = start;;) { | |
154 | if (!*trv) | |
155 | return (0); | |
156 | if (*trv == 'Z') { | |
157 | if (trv == suffp) | |
158 | return (0); | |
159 | *trv++ = 'a'; | |
160 | } else { | |
161 | if (isdigit(*trv)) | |
162 | *trv = 'a'; | |
163 | else if (*trv == 'z') /* inc from z to A */ | |
164 | *trv = 'A'; | |
165 | else { | |
166 | if (trv == suffp) | |
167 | return (0); | |
168 | ++*trv; | |
169 | } | |
170 | break; | |
171 | } | |
172 | } | |
173 | } | |
174 | /*NOTREACHED*/ | |
175 | } | |
176 | ||
6a9b3198 | 177 | #endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */ |