xref: /openbsd-src/usr.bin/mktemp/mktemp.c (revision ec6f9a749b05dda42a1e6af0dd03e6407ed3ac65)
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