1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (c) 2020 by Delphix. All rights reserved.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/vfs.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#include <libshare.h>
#include "libshare_impl.h"
#include "nfs.h"
#define _PATH_MOUNTDPID "/var/run/mountd.pid"
#define OPTSSIZE 1024
#define MAXLINESIZE (PATH_MAX + OPTSSIZE)
#define ZFS_EXPORTS_FILE "/etc/zfs/exports"
#define ZFS_EXPORTS_LOCK ZFS_EXPORTS_FILE".lock"
/*
* This function translates options to a format acceptable by exports(5), eg.
*
* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \
* zfs.freebsd.org 69.147.83.54
*
* Accepted input formats:
*
* ro,network=192.168.0.0,mask=255.255.255.0,maproot=0,zfs.freebsd.org
* ro network=192.168.0.0 mask=255.255.255.0 maproot=0 zfs.freebsd.org
* -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,zfs.freebsd.org
* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \
* zfs.freebsd.org
*
* Recognized keywords:
*
* ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs,
* index, quiet
*/
static int
translate_opts(const char *shareopts, FILE *out)
{
static const char *const known_opts[] = { "ro", "maproot", "mapall",
"mask", "network", "sec", "alldirs", "public", "webnfs", "index",
"quiet" };
char oldopts[OPTSSIZE], newopts[OPTSSIZE];
char *o, *s = NULL;
unsigned int i;
size_t len;
strlcpy(oldopts, shareopts, sizeof (oldopts));
newopts[0] = '\0';
s = oldopts;
while ((o = strsep(&s, "-, ")) != NULL) {
if (o[0] == '\0')
continue;
for (i = 0; i < ARRAY_SIZE(known_opts); ++i) {
len = strlen(known_opts[i]);
if (strncmp(known_opts[i], o, len) == 0 &&
(o[len] == '\0' || o[len] == '=')) {
strlcat(newopts, "-", sizeof (newopts));
break;
}
}
strlcat(newopts, o, sizeof (newopts));
strlcat(newopts, " ", sizeof (newopts));
}
return (fputs(newopts, out));
}
static int
nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile)
{
const char *shareopts = impl_share->sa_shareopts;
if (strcmp(shareopts, "on") == 0)
shareopts = "";
boolean_t need_free;
char *mp;
int rc = nfs_escape_mountpoint(impl_share->sa_mountpoint, &mp,
&need_free);
if (rc != SA_OK)
return (rc);
if (fputs(mp, tmpfile) == EOF ||
fputc('\t', tmpfile) == EOF ||
translate_opts(shareopts, tmpfile) == EOF ||
fputc('\n', tmpfile) == EOF) {
fprintf(stderr, "failed to write to temporary file\n");
rc = SA_SYSTEM_ERR;
}
if (need_free)
free(mp);
return (rc);
}
static int
nfs_enable_share(sa_share_impl_t impl_share)
{
return (nfs_toggle_share(
ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share,
nfs_enable_share_impl));
}
static int
nfs_disable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile)
{
(void) impl_share, (void) tmpfile;
return (SA_OK);
}
static int
nfs_disable_share(sa_share_impl_t impl_share)
{
return (nfs_toggle_share(
ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share,
nfs_disable_share_impl));
}
static boolean_t
nfs_is_shared(sa_share_impl_t impl_share)
{
return (nfs_is_shared_impl(ZFS_EXPORTS_FILE, impl_share));
}
static int
nfs_validate_shareopts(const char *shareopts)
{
(void) shareopts;
return (SA_OK);
}
/*
* Commit the shares by restarting mountd.
*/
static int
nfs_commit_shares(void)
{
struct pidfh *pfh;
pid_t mountdpid;
start:
pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
if (pfh != NULL) {
/* mountd(8) is not running. */
pidfile_remove(pfh);
return (SA_OK);
}
if (errno != EEXIST) {
/* Cannot open pidfile for some reason. */
return (SA_SYSTEM_ERR);
}
if (mountdpid == -1) {
/* mountd(8) exists, but didn't write the PID yet */
usleep(500);
goto start;
}
/* We have mountd(8) PID in mountdpid variable. */
kill(mountdpid, SIGHUP);
return (SA_OK);
}
const sa_fstype_t libshare_nfs_type = {
.enable_share = nfs_enable_share,
.disable_share = nfs_disable_share,
.is_shared = nfs_is_shared,
.validate_shareopts = nfs_validate_shareopts,
.commit_shares = nfs_commit_shares,
};
|
