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c15d36c6 GW |
1 | /* |
2 | * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND | |
15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE | |
18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
24 | * SUCH DAMAGE. | |
25 | * | |
ede037cd | 26 | * Copyright (c) 2020, 2022 by Delphix. All rights reserved. |
c15d36c6 GW |
27 | */ |
28 | ||
29 | #include <sys/cdefs.h> | |
30 | __FBSDID("$FreeBSD$"); | |
31 | ||
32 | #include <sys/param.h> | |
33 | #include <sys/vfs.h> | |
34 | ||
35 | #include <assert.h> | |
36 | #include <errno.h> | |
37 | #include <fcntl.h> | |
38 | #include <libutil.h> | |
39 | #include <signal.h> | |
40 | #include <stdio.h> | |
41 | #include <string.h> | |
42 | #include <unistd.h> | |
43 | #include <libintl.h> | |
44 | ||
eefaa55f | 45 | #include <libshare.h> |
c15d36c6 GW |
46 | #include "libshare_impl.h" |
47 | #include "nfs.h" | |
48 | ||
49 | #define _PATH_MOUNTDPID "/var/run/mountd.pid" | |
c15d36c6 GW |
50 | #define OPTSSIZE 1024 |
51 | #define MAXLINESIZE (PATH_MAX + OPTSSIZE) | |
52 | #define ZFS_EXPORTS_FILE "/etc/zfs/exports" | |
53 | #define ZFS_EXPORTS_LOCK ZFS_EXPORTS_FILE".lock" | |
54 | ||
c15d36c6 | 55 | /* |
ee668b83 | 56 | * This function translates options to a format acceptable by exports(5), eg. |
c15d36c6 GW |
57 | * |
58 | * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \ | |
59 | * zfs.freebsd.org 69.147.83.54 | |
60 | * | |
61 | * Accepted input formats: | |
62 | * | |
63 | * ro,network=192.168.0.0,mask=255.255.255.0,maproot=0,zfs.freebsd.org | |
64 | * ro network=192.168.0.0 mask=255.255.255.0 maproot=0 zfs.freebsd.org | |
65 | * -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,zfs.freebsd.org | |
66 | * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \ | |
67 | * zfs.freebsd.org | |
68 | * | |
69 | * Recognized keywords: | |
70 | * | |
71 | * ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs, | |
72 | * index, quiet | |
c15d36c6 | 73 | */ |
ee668b83 AZ |
74 | static int |
75 | translate_opts(const char *shareopts, FILE *out) | |
c15d36c6 | 76 | { |
5f0c1c4e AZ |
77 | static const char *const known_opts[] = { "ro", "maproot", "mapall", |
78 | "mask", "network", "sec", "alldirs", "public", "webnfs", "index", | |
79 | "quiet" }; | |
ee668b83 | 80 | char oldopts[OPTSSIZE], newopts[OPTSSIZE]; |
c15d36c6 GW |
81 | char *o, *s = NULL; |
82 | unsigned int i; | |
83 | size_t len; | |
84 | ||
85 | strlcpy(oldopts, shareopts, sizeof (oldopts)); | |
86 | newopts[0] = '\0'; | |
87 | s = oldopts; | |
88 | while ((o = strsep(&s, "-, ")) != NULL) { | |
89 | if (o[0] == '\0') | |
90 | continue; | |
5f0c1c4e | 91 | for (i = 0; i < ARRAY_SIZE(known_opts); ++i) { |
c15d36c6 GW |
92 | len = strlen(known_opts[i]); |
93 | if (strncmp(known_opts[i], o, len) == 0 && | |
94 | (o[len] == '\0' || o[len] == '=')) { | |
95 | strlcat(newopts, "-", sizeof (newopts)); | |
96 | break; | |
97 | } | |
98 | } | |
99 | strlcat(newopts, o, sizeof (newopts)); | |
100 | strlcat(newopts, " ", sizeof (newopts)); | |
101 | } | |
ee668b83 | 102 | return (fputs(newopts, out)); |
c15d36c6 GW |
103 | } |
104 | ||
c15d36c6 | 105 | static int |
c53f2e9b | 106 | nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) |
c15d36c6 | 107 | { |
63ce6dd9 | 108 | const char *shareopts = impl_share->sa_shareopts; |
c15d36c6 GW |
109 | if (strcmp(shareopts, "on") == 0) |
110 | shareopts = ""; | |
111 | ||
9b06aa63 AZ |
112 | boolean_t need_free; |
113 | char *mp; | |
114 | int rc = nfs_escape_mountpoint(impl_share->sa_mountpoint, &mp, | |
115 | &need_free); | |
116 | if (rc != SA_OK) | |
117 | return (rc); | |
118 | ||
119 | if (fputs(mp, tmpfile) == EOF || | |
ee668b83 AZ |
120 | fputc('\t', tmpfile) == EOF || |
121 | translate_opts(shareopts, tmpfile) == EOF || | |
122 | fputc('\n', tmpfile) == EOF) { | |
c53f2e9b | 123 | fprintf(stderr, "failed to write to temporary file\n"); |
9b06aa63 | 124 | rc = SA_SYSTEM_ERR; |
c15d36c6 | 125 | } |
dc3a56d3 | 126 | |
9b06aa63 AZ |
127 | if (need_free) |
128 | free(mp); | |
129 | return (rc); | |
dc3a56d3 AZ |
130 | } |
131 | ||
132 | static int | |
133 | nfs_enable_share(sa_share_impl_t impl_share) | |
134 | { | |
135 | return (nfs_toggle_share( | |
136 | ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share, | |
137 | nfs_enable_share_impl)); | |
138 | } | |
139 | ||
140 | static int | |
c53f2e9b | 141 | nfs_disable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) |
dc3a56d3 | 142 | { |
57bff80e | 143 | (void) impl_share, (void) tmpfile; |
dc3a56d3 | 144 | return (SA_OK); |
c15d36c6 GW |
145 | } |
146 | ||
147 | static int | |
148 | nfs_disable_share(sa_share_impl_t impl_share) | |
149 | { | |
dc3a56d3 AZ |
150 | return (nfs_toggle_share( |
151 | ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share, | |
152 | nfs_disable_share_impl)); | |
c15d36c6 GW |
153 | } |
154 | ||
c15d36c6 GW |
155 | static boolean_t |
156 | nfs_is_shared(sa_share_impl_t impl_share) | |
157 | { | |
605e03e5 | 158 | return (nfs_is_shared_impl(ZFS_EXPORTS_FILE, impl_share)); |
c15d36c6 GW |
159 | } |
160 | ||
161 | static int | |
162 | nfs_validate_shareopts(const char *shareopts) | |
163 | { | |
46c7a802 | 164 | (void) shareopts; |
c15d36c6 GW |
165 | return (SA_OK); |
166 | } | |
167 | ||
c15d36c6 GW |
168 | /* |
169 | * Commit the shares by restarting mountd. | |
170 | */ | |
171 | static int | |
172 | nfs_commit_shares(void) | |
173 | { | |
174 | struct pidfh *pfh; | |
175 | pid_t mountdpid; | |
176 | ||
bdf6464c | 177 | start: |
c15d36c6 GW |
178 | pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid); |
179 | if (pfh != NULL) { | |
bdf6464c | 180 | /* mountd(8) is not running. */ |
c15d36c6 GW |
181 | pidfile_remove(pfh); |
182 | return (SA_OK); | |
183 | } | |
184 | if (errno != EEXIST) { | |
185 | /* Cannot open pidfile for some reason. */ | |
186 | return (SA_SYSTEM_ERR); | |
187 | } | |
bdf6464c AZ |
188 | if (mountdpid == -1) { |
189 | /* mountd(8) exists, but didn't write the PID yet */ | |
190 | usleep(500); | |
191 | goto start; | |
192 | } | |
c15d36c6 GW |
193 | /* We have mountd(8) PID in mountdpid variable. */ |
194 | kill(mountdpid, SIGHUP); | |
195 | return (SA_OK); | |
196 | } | |
197 | ||
ede037cd DB |
198 | static void |
199 | nfs_truncate_shares(void) | |
200 | { | |
201 | nfs_reset_shares(ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE); | |
202 | } | |
203 | ||
471e9a10 | 204 | const sa_fstype_t libshare_nfs_type = { |
c15d36c6 GW |
205 | .enable_share = nfs_enable_share, |
206 | .disable_share = nfs_disable_share, | |
207 | .is_shared = nfs_is_shared, | |
208 | ||
209 | .validate_shareopts = nfs_validate_shareopts, | |
c15d36c6 | 210 | .commit_shares = nfs_commit_shares, |
ede037cd | 211 | .truncate_shares = nfs_truncate_shares, |
c15d36c6 | 212 | }; |