1 /*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 char copyright[] =
13 "@(#) Copyright (c) 1992, 1993, 1994\n\
14 The Regents of the University of California. All rights reserved.\n";
15 #endif /* not lint */
16
17 #ifndef lint
18 static char sccsid[] = "@(#)mount_lofs.c 8.4 (Berkeley) 03/27/94";
19 #endif /* not lint */
20
21 #include <sys/param.h>
22 #include <sys/mount.h>
23
24 #include <miscfs/lofs/lofs.h>
25
26 #include <err.h>
27 #include <stdio.h>
28 #include <unistd.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "mntopts.h"
33
34 struct mntopt mopts[] = {
35 MOPT_STDOPTS,
36 { NULL }
37 };
38
39 int subdir __P((const char *, const char *));
40 void usage __P((void));
41
42 int
main(argc,argv)43 main(argc, argv)
44 int argc;
45 char *argv[];
46 {
47 struct lofs_args args;
48 int ch, mntflags;
49 char target[MAXPATHLEN];
50
51 mntflags = 0;
52 while ((ch = getopt(argc, argv, "o:")) != EOF)
53 switch (ch) {
54 case 'o':
55 getmntopts(optarg, mopts, &mntflags);
56 break;
57 case '?':
58 default:
59 usage();
60 }
61 argc -= optind;
62 argv += optind;
63
64 if (argc != 2)
65 usage();
66
67 if (realpath(argv[0], target) == 0)
68 err(1, "%s", target);
69
70 if (subdir(target, argv[1]) || subdir(argv[1], target))
71 errx(1, "%s (%s) and %s are not distinct paths",
72 argv[0], target, argv[1]);
73
74 args.target = target;
75
76 if (mount(MOUNT_LOFS, argv[1], mntflags, &args))
77 err(1, NULL);
78 exit(0);
79 }
80
81 int
subdir(p,dir)82 subdir(p, dir)
83 const char *p;
84 const char *dir;
85 {
86 int l;
87
88 l = strlen(dir);
89 if (l <= 1)
90 return (1);
91
92 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
93 return (1);
94
95 return (0);
96 }
97
98 void
usage()99 usage()
100 {
101 (void)fprintf(stderr,
102 "usage: mount_lofs [-o options] target_fs mount_point\n");
103 exit(1);
104 }
105