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 * 26 * Copyright (c) 2020, 2022 by Delphix. All rights reserved. 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 45 #include <libshare.h> 46 #include "libshare_impl.h" 47 #include "nfs.h" 48 49 #define _PATH_MOUNTDPID "/var/run/mountd.pid" 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 55 /* 56 * This function translates options to a format acceptable by exports(5), eg. 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 73 */ 74 static int 75 translate_opts(const char *shareopts, FILE *out) 76 { 77 static const char *const known_opts[] = { "ro", "maproot", "mapall", 78 "mask", "network", "sec", "alldirs", "public", "webnfs", "index", 79 "quiet" }; 80 char oldopts[OPTSSIZE], newopts[OPTSSIZE]; 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; 91 for (i = 0; i < ARRAY_SIZE(known_opts); ++i) { 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 } 102 return (fputs(newopts, out)); 103 } 104 105 static int 106 nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) 107 { 108 const char *shareopts = impl_share->sa_shareopts; 109 if (strcmp(shareopts, "on") == 0) 110 shareopts = ""; 111 112 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 || 120 fputc('\t', tmpfile) == EOF || 121 translate_opts(shareopts, tmpfile) == EOF || 122 fputc('\n', tmpfile) == EOF) { 123 fprintf(stderr, "failed to write to temporary file\n"); 124 rc = SA_SYSTEM_ERR; 125 } 126 127 if (need_free) 128 free(mp); 129 return (rc); 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 141 nfs_disable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) 142 { 143 (void) impl_share, (void) tmpfile; 144 return (SA_OK); 145 } 146 147 static int 148 nfs_disable_share(sa_share_impl_t impl_share) 149 { 150 return (nfs_toggle_share( 151 ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share, 152 nfs_disable_share_impl)); 153 } 154 155 static boolean_t 156 nfs_is_shared(sa_share_impl_t impl_share) 157 { 158 return (nfs_is_shared_impl(ZFS_EXPORTS_FILE, impl_share)); 159 } 160 161 static int 162 nfs_validate_shareopts(const char *shareopts) 163 { 164 if (strlen(shareopts) == 0) 165 return (SA_SYNTAX_ERR); 166 return (SA_OK); 167 } 168 169 /* 170 * Commit the shares by restarting mountd. 171 */ 172 static int 173 nfs_commit_shares(void) 174 { 175 struct pidfh *pfh; 176 pid_t mountdpid; 177 178 start: 179 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid); 180 if (pfh != NULL) { 181 /* mountd(8) is not running. */ 182 pidfile_remove(pfh); 183 return (SA_OK); 184 } 185 if (errno != EEXIST) { 186 /* Cannot open pidfile for some reason. */ 187 return (SA_SYSTEM_ERR); 188 } 189 if (mountdpid == -1) { 190 /* mountd(8) exists, but didn't write the PID yet */ 191 usleep(500); 192 goto start; 193 } 194 /* We have mountd(8) PID in mountdpid variable. */ 195 kill(mountdpid, SIGHUP); 196 return (SA_OK); 197 } 198 199 static void 200 nfs_truncate_shares(void) 201 { 202 nfs_reset_shares(ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE); 203 } 204 205 const sa_fstype_t libshare_nfs_type = { 206 .enable_share = nfs_enable_share, 207 .disable_share = nfs_disable_share, 208 .is_shared = nfs_is_shared, 209 210 .validate_shareopts = nfs_validate_shareopts, 211 .commit_shares = nfs_commit_shares, 212 .truncate_shares = nfs_truncate_shares, 213 }; 214