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 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 static sa_fstype_t *nfs_fstype; 56 57 /* 58 * This function translate options to a format acceptable by exports(5), eg. 59 * 60 * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \ 61 * zfs.freebsd.org 69.147.83.54 62 * 63 * Accepted input formats: 64 * 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 zfs.freebsd.org 67 * -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,zfs.freebsd.org 68 * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \ 69 * zfs.freebsd.org 70 * 71 * Recognized keywords: 72 * 73 * ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs, 74 * index, quiet 75 * 76 * NOTE: This function returns a static buffer and thus is not thread-safe. 77 */ 78 static char * 79 translate_opts(const char *shareopts) 80 { 81 static const char *known_opts[] = { "ro", "maproot", "mapall", "mask", 82 "network", "sec", "alldirs", "public", "webnfs", "index", "quiet", 83 NULL }; 84 static char newopts[OPTSSIZE]; 85 char oldopts[OPTSSIZE]; 86 char *o, *s = NULL; 87 unsigned int i; 88 size_t len; 89 90 strlcpy(oldopts, shareopts, sizeof (oldopts)); 91 newopts[0] = '\0'; 92 s = oldopts; 93 while ((o = strsep(&s, "-, ")) != NULL) { 94 if (o[0] == '\0') 95 continue; 96 for (i = 0; known_opts[i] != NULL; i++) { 97 len = strlen(known_opts[i]); 98 if (strncmp(known_opts[i], o, len) == 0 && 99 (o[len] == '\0' || o[len] == '=')) { 100 strlcat(newopts, "-", sizeof (newopts)); 101 break; 102 } 103 } 104 strlcat(newopts, o, sizeof (newopts)); 105 strlcat(newopts, " ", sizeof (newopts)); 106 } 107 return (newopts); 108 } 109 110 static int 111 nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) 112 { 113 char *shareopts = FSINFO(impl_share, nfs_fstype)->shareopts; 114 if (strcmp(shareopts, "on") == 0) 115 shareopts = ""; 116 117 if (fprintf(tmpfile, "%s\t%s\n", impl_share->sa_mountpoint, 118 translate_opts(shareopts)) < 0) { 119 fprintf(stderr, "failed to write to temporary file\n"); 120 return (SA_SYSTEM_ERR); 121 } 122 123 return (SA_OK); 124 } 125 126 static int 127 nfs_enable_share(sa_share_impl_t impl_share) 128 { 129 return (nfs_toggle_share( 130 ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share, 131 nfs_enable_share_impl)); 132 } 133 134 static int 135 nfs_disable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) 136 { 137 (void) impl_share, (void) tmpfile; 138 return (SA_OK); 139 } 140 141 static int 142 nfs_disable_share(sa_share_impl_t impl_share) 143 { 144 return (nfs_toggle_share( 145 ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share, 146 nfs_disable_share_impl)); 147 } 148 149 static boolean_t 150 nfs_is_shared(sa_share_impl_t impl_share) 151 { 152 return (nfs_is_shared_impl(ZFS_EXPORTS_FILE, impl_share)); 153 } 154 155 static int 156 nfs_validate_shareopts(const char *shareopts) 157 { 158 (void) shareopts; 159 return (SA_OK); 160 } 161 162 static int 163 nfs_update_shareopts(sa_share_impl_t impl_share, const char *shareopts) 164 { 165 FSINFO(impl_share, nfs_fstype)->shareopts = (char *)shareopts; 166 return (SA_OK); 167 } 168 169 static void 170 nfs_clear_shareopts(sa_share_impl_t impl_share) 171 { 172 FSINFO(impl_share, nfs_fstype)->shareopts = NULL; 173 } 174 175 /* 176 * Commit the shares by restarting mountd. 177 */ 178 static int 179 nfs_commit_shares(void) 180 { 181 struct pidfh *pfh; 182 pid_t mountdpid; 183 184 start: 185 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid); 186 if (pfh != NULL) { 187 /* mountd(8) is not running. */ 188 pidfile_remove(pfh); 189 return (SA_OK); 190 } 191 if (errno != EEXIST) { 192 /* Cannot open pidfile for some reason. */ 193 return (SA_SYSTEM_ERR); 194 } 195 if (mountdpid == -1) { 196 /* mountd(8) exists, but didn't write the PID yet */ 197 usleep(500); 198 goto start; 199 } 200 /* We have mountd(8) PID in mountdpid variable. */ 201 kill(mountdpid, SIGHUP); 202 return (SA_OK); 203 } 204 205 static const sa_share_ops_t nfs_shareops = { 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 .update_shareopts = nfs_update_shareopts, 212 .clear_shareopts = nfs_clear_shareopts, 213 .commit_shares = nfs_commit_shares, 214 }; 215 216 /* 217 * Initializes the NFS functionality of libshare. 218 */ 219 void 220 libshare_nfs_init(void) 221 { 222 nfs_fstype = register_fstype("nfs", &nfs_shareops); 223 } 224