1 /* $NetBSD: mount_puffs.c,v 1.5 2016/11/23 14:33:29 pho Exp $ */
2
3 /*
4 * Copyright (c) 2010 Antti Kantee. All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 /*
29 * This is to support -o getargs without having to replicate it in
30 * every file server. It also allows puffs filesystems to be mounted
31 * via "mount -a".
32 */
33
34 #include <sys/cdefs.h>
35 #ifndef lint
36 __RCSID("$NetBSD: mount_puffs.c,v 1.5 2016/11/23 14:33:29 pho Exp $");
37 #endif /* !lint */
38
39 #include <sys/param.h>
40 #include <sys/mount.h>
41
42 #include <fs/puffs/puffs_msgif.h>
43
44 #include <err.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <sys/cdefs.h>
49 #include <unistd.h>
50 #include <util.h>
51
52 static int
usage(void)53 usage(void)
54 {
55
56 fprintf(stderr, "usage: %s [-o options] program[#source] mountpoint\n", getprogname());
57 return 1;
58 }
59
show_puffs_mount_args(const char * mountpoint)60 static int show_puffs_mount_args(const char *mountpoint)
61 {
62 const char *vtypes[] = { VNODE_TYPES };
63 struct puffs_kargs kargs;
64
65 if (mount(MOUNT_PUFFS, mountpoint, MNT_GETARGS, &kargs, sizeof(kargs)) == -1)
66 err(1, "mount");
67
68 printf("version=%d, ", kargs.pa_vers);
69 printf("flags=0x%x, ", kargs.pa_flags);
70
71 printf("root cookie=%p, ", kargs.pa_root_cookie);
72 printf("root type=%s", vtypes[kargs.pa_root_vtype]);
73
74 if (kargs.pa_root_vtype != VDIR)
75 printf(", root size=%llu",
76 (unsigned long long)kargs.pa_root_vsize);
77 if (kargs.pa_root_vtype == VCHR || kargs.pa_root_vtype == VBLK)
78 printf(", root rdev=0x%" PRIx64, (uint64_t)kargs.pa_root_rdev);
79 printf("\n");
80
81 return 0;
82 }
83
84 static int
mount_puffs_filesystem(const char * program,const char * opts,const char * source,const char * mountpoint)85 mount_puffs_filesystem(const char *program, const char *opts,
86 const char *source, const char *mountpoint)
87 {
88 int argc = 0;
89 const char **argv;
90 int rv = 0;
91
92 /* Construct an argument vector:
93 * program [-o opts] [source] mountpoint */
94 argv = ecalloc(1 + 2 + 1 + 1, sizeof(*argv));
95 argv[argc++] = program;
96 if (opts != NULL) {
97 argv[argc++] = "-o";
98 argv[argc++] = opts;
99 }
100 if (source != NULL) {
101 argv[argc++] = source;
102 }
103 argv[argc++] = mountpoint;
104 argv[argc] = NULL;
105
106 /* We intentionally use execvp(3) here because the program can
107 * actually be a basename. */
108 if (execvp(program, __UNCONST(argv)) == -1) {
109 warn("Cannot execute %s", program);
110 rv = 1;
111 }
112
113 free(argv);
114 return rv;
115 }
116
add_opt(char ** opts,const char * opt)117 static void add_opt(char **opts, const char *opt)
118 {
119 const size_t orig_len = *opts == NULL ? 0 : strlen(*opts);
120
121 *opts = erealloc(*opts, orig_len + 1 + strlen(opt) + 1);
122
123 if (orig_len == 0) {
124 strcpy(*opts, opt);
125 }
126 else {
127 strcat(*opts, ",");
128 strcat(*opts, opt);
129 }
130 }
131
132 int
main(int argc,char * argv[])133 main(int argc, char *argv[])
134 {
135 int mntflags = 0;
136 int ch;
137 char *opts = NULL;
138 int rv = 0;
139
140 while ((ch = getopt(argc, argv, "o:")) != -1) {
141 switch (ch) {
142 case 'o':
143 for (char *opt = optarg; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
144 if (strcmp(opt, "getargs") == 0) {
145 mntflags |= MNT_GETARGS;
146 break; /* No need to parse it any further. */
147 }
148 else {
149 add_opt(&opts, opt);
150 }
151 }
152 break;
153 default:
154 rv = usage();
155 goto free_opts;
156 }
157 }
158 argc -= optind;
159 argv += optind;
160
161 if (argc != 2) {
162 rv = usage();
163 goto free_opts;
164 }
165
166 if (mntflags & MNT_GETARGS) {
167 /* Special case for -o getargs: retrieve kernel arguments for
168 * an already mounted filesystem. */
169 rv = show_puffs_mount_args(argv[1]);
170 }
171 else {
172 /* Split the program name and source. This is to allow
173 * filesystems to be mounted via "mount -a" i.e. /etc/fstab */
174 char *source = argv[0];
175 char *program = strsep(&source, "#");
176
177 rv = mount_puffs_filesystem(program, opts, source, argv[1]);
178 }
179
180 free_opts:
181 free(opts);
182 return rv;
183 }
184