1 /* $OpenBSD: mktemp.c,v 1.26 2024/03/01 21:50:40 millert Exp $ */
2
3 /*
4 * Copyright (c) 1996, 1997, 2001-2003, 2013
5 * Todd C. Miller <millert@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <err.h>
21 #include <paths.h>
22 #include <stdarg.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27
28 __dead void usage(void);
29 __dead void fatal(const char *, ...) __attribute__((__format__(printf, 1, 2)));
30 __dead void fatalx(const char *, ...) __attribute__((__format__(printf, 1, 2)));
31
32 static int quiet;
33
34 int
main(int argc,char * argv[])35 main(int argc, char *argv[])
36 {
37 int ch, fd, uflag = 0, tflag = 0, makedir = 0;
38 char *base, *cp, *template, *tempfile, *prefix = _PATH_TMP;
39 size_t len, suffixlen = 0;
40
41 if (pledge("stdio rpath wpath cpath", NULL) == -1)
42 err(1, "pledge");
43
44 while ((ch = getopt(argc, argv, "dp:qtu")) != -1)
45 switch(ch) {
46 case 'd':
47 makedir = 1;
48 break;
49 case 'p':
50 prefix = optarg;
51 tflag = 1;
52 break;
53 case 'q':
54 quiet = 1;
55 break;
56 case 't':
57 tflag = 1;
58 break;
59 case 'u':
60 uflag = 1;
61 break;
62 default:
63 usage();
64 }
65
66 /* If no template specified use a default one (implies -t mode) */
67 switch (argc - optind) {
68 case 1:
69 template = argv[optind];
70 break;
71 case 0:
72 template = "tmp.XXXXXXXXXX";
73 tflag = 1;
74 break;
75 default:
76 usage();
77 }
78
79 base = strrchr(template, '/');
80 if (base != NULL)
81 base++;
82 else
83 base = template;
84 len = strlen(base);
85 if (len > 0 && base[len - 1] != 'X') {
86 /* Check for suffix, e.g. /tmp/XXXXXX.foo in last component. */
87 for (suffixlen = 0; suffixlen < len; suffixlen++) {
88 if (base[len - suffixlen - 1] == 'X')
89 break;
90 }
91 }
92 if (len - suffixlen < 6 ||
93 strncmp(&base[len - suffixlen - 6], "XXXXXX", 6)) {
94 fatalx("insufficient number of Xs in template `%s'",
95 template);
96 }
97 if (tflag) {
98 if (base != template) {
99 fatalx("template must not contain directory "
100 "separators in -t mode");
101 }
102
103 cp = getenv("TMPDIR");
104 if (cp != NULL && *cp != '\0')
105 prefix = cp;
106 len = strlen(prefix);
107 while (len != 0 && prefix[len - 1] == '/')
108 len--;
109
110 if (asprintf(&tempfile, "%.*s/%s", (int)len, prefix, template) == -1)
111 tempfile = NULL;
112 } else
113 tempfile = strdup(template);
114
115 if (tempfile == NULL)
116 fatalx("cannot allocate memory");
117
118 if (makedir) {
119 if (mkdtemps(tempfile, suffixlen) == NULL)
120 fatal("cannot make temp dir %s", tempfile);
121 if (uflag)
122 (void)rmdir(tempfile);
123 } else {
124 if ((fd = mkstemps(tempfile, suffixlen)) == -1)
125 fatal("cannot make temp file %s", tempfile);
126 (void)close(fd);
127 if (uflag)
128 (void)unlink(tempfile);
129 }
130
131 (void)puts(tempfile);
132 free(tempfile);
133
134 return EXIT_SUCCESS;
135 }
136
137 __dead void
fatal(const char * fmt,...)138 fatal(const char *fmt, ...)
139 {
140 if (!quiet) {
141 va_list ap;
142
143 va_start(ap, fmt);
144 vwarn(fmt, ap);
145 va_end(ap);
146 }
147 exit(EXIT_FAILURE);
148 }
149
150 __dead void
fatalx(const char * fmt,...)151 fatalx(const char *fmt, ...)
152 {
153 if (!quiet) {
154 va_list ap;
155
156 va_start(ap, fmt);
157 vwarnx(fmt, ap);
158 va_end(ap);
159 }
160 exit(EXIT_FAILURE);
161 }
162
163 __dead void
usage(void)164 usage(void)
165 {
166 extern char *__progname;
167
168 (void)fprintf(stderr,
169 "usage: %s [-dqtu] [-p directory] [template]\n", __progname);
170 exit(EXIT_FAILURE);
171 }
172