1 /*- 2 * Copyright (c) 2014 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/time.h> 36 #include <sys/ioctl.h> 37 #include <sys/param.h> 38 #include <sys/linker.h> 39 #include <sys/mount.h> 40 #include <sys/socket.h> 41 #include <sys/stat.h> 42 #include <sys/wait.h> 43 #include <sys/utsname.h> 44 #include <assert.h> 45 #include <ctype.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <libgen.h> 49 #include <netdb.h> 50 #include <signal.h> 51 #include <stdbool.h> 52 #include <stdint.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include <libutil.h> 59 60 #include "common.h" 61 #include "mntopts.h" 62 63 static int 64 unmount_by_statfs(const struct statfs *sb, bool force) 65 { 66 char *fsid_str; 67 int error, ret, flags; 68 69 ret = asprintf(&fsid_str, "FSID:%d:%d", 70 sb->f_fsid.val[0], sb->f_fsid.val[1]); 71 if (ret < 0) 72 log_err(1, "asprintf"); 73 74 log_debugx("unmounting %s using %s", sb->f_mntonname, fsid_str); 75 76 flags = MNT_BYFSID; 77 if (force) 78 flags |= MNT_FORCE; 79 error = unmount(fsid_str, flags); 80 free(fsid_str); 81 if (error != 0) 82 log_warn("cannot unmount %s", sb->f_mntonname); 83 84 return (error); 85 } 86 87 static const struct statfs * 88 find_statfs(const struct statfs *mntbuf, int nitems, const char *mountpoint) 89 { 90 int i; 91 92 for (i = 0; i < nitems; i++) { 93 if (strcmp(mntbuf[i].f_mntonname, mountpoint) == 0) 94 return (mntbuf + i); 95 } 96 97 return (NULL); 98 } 99 100 static void 101 mount_autofs(const char *from, const char *fspath, const char *options, 102 const char *prefix) 103 { 104 struct iovec *iov = NULL; 105 char errmsg[255]; 106 int error, iovlen = 0; 107 108 create_directory(fspath); 109 110 log_debugx("mounting %s on %s, prefix \"%s\", options \"%s\"", 111 from, fspath, prefix, options); 112 memset(errmsg, 0, sizeof(errmsg)); 113 114 build_iovec(&iov, &iovlen, "fstype", 115 __DECONST(void *, "autofs"), (size_t)-1); 116 build_iovec(&iov, &iovlen, "fspath", 117 __DECONST(void *, fspath), (size_t)-1); 118 build_iovec(&iov, &iovlen, "from", 119 __DECONST(void *, from), (size_t)-1); 120 build_iovec(&iov, &iovlen, "errmsg", 121 errmsg, sizeof(errmsg)); 122 123 /* 124 * Append the options and mountpoint defined in auto_master(5); 125 * this way automountd(8) does not need to parse it. 126 */ 127 build_iovec(&iov, &iovlen, "master_options", 128 __DECONST(void *, options), (size_t)-1); 129 build_iovec(&iov, &iovlen, "master_prefix", 130 __DECONST(void *, prefix), (size_t)-1); 131 132 error = nmount(iov, iovlen, 0); 133 if (error != 0) { 134 if (*errmsg != '\0') { 135 log_err(1, "cannot mount %s on %s: %s", 136 from, fspath, errmsg); 137 } else { 138 log_err(1, "cannot mount %s on %s", from, fspath); 139 } 140 } 141 } 142 143 static void 144 mount_if_not_already(const struct node *n, const char *map, const char *options, 145 const char *prefix, const struct statfs *mntbuf, int nitems) 146 { 147 const struct statfs *sb; 148 char *mountpoint; 149 char *from; 150 int ret; 151 152 ret = asprintf(&from, "map %s", map); 153 if (ret < 0) 154 log_err(1, "asprintf"); 155 156 mountpoint = node_path(n); 157 sb = find_statfs(mntbuf, nitems, mountpoint); 158 if (sb != NULL) { 159 if (strcmp(sb->f_fstypename, "autofs") != 0) { 160 log_debugx("unknown filesystem mounted " 161 "on %s; mounting", mountpoint); 162 /* 163 * XXX: Compare options and 'from', 164 * and update the mount if necessary. 165 */ 166 } else { 167 log_debugx("autofs already mounted " 168 "on %s", mountpoint); 169 free(from); 170 free(mountpoint); 171 return; 172 } 173 } else { 174 log_debugx("nothing mounted on %s; mounting", 175 mountpoint); 176 } 177 178 mount_autofs(from, mountpoint, options, prefix); 179 free(from); 180 free(mountpoint); 181 } 182 183 static void 184 mount_unmount(struct node *root) 185 { 186 struct statfs *mntbuf; 187 struct node *n, *n2; 188 int i, nitems; 189 190 nitems = getmntinfo(&mntbuf, MNT_WAIT); 191 if (nitems <= 0) 192 log_err(1, "getmntinfo"); 193 194 log_debugx("unmounting stale autofs mounts"); 195 196 for (i = 0; i < nitems; i++) { 197 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) { 198 log_debugx("skipping %s, filesystem type is not autofs", 199 mntbuf[i].f_mntonname); 200 continue; 201 } 202 203 n = node_find(root, mntbuf[i].f_mntonname); 204 if (n != NULL) { 205 log_debugx("leaving autofs mounted on %s", 206 mntbuf[i].f_mntonname); 207 continue; 208 } 209 210 log_debugx("autofs mounted on %s not found " 211 "in new configuration; unmounting", mntbuf[i].f_mntonname); 212 unmount_by_statfs(&(mntbuf[i]), false); 213 } 214 215 log_debugx("mounting new autofs mounts"); 216 217 TAILQ_FOREACH(n, &root->n_children, n_next) { 218 if (!node_is_direct_map(n)) { 219 mount_if_not_already(n, n->n_map, n->n_options, 220 n->n_key, mntbuf, nitems); 221 continue; 222 } 223 224 TAILQ_FOREACH(n2, &n->n_children, n_next) { 225 mount_if_not_already(n2, n->n_map, n->n_options, 226 "/", mntbuf, nitems); 227 } 228 } 229 } 230 231 static void 232 flush_autofs(const char *fspath) 233 { 234 struct iovec *iov = NULL; 235 char errmsg[255]; 236 int error, iovlen = 0; 237 238 log_debugx("flushing %s", fspath); 239 memset(errmsg, 0, sizeof(errmsg)); 240 241 build_iovec(&iov, &iovlen, "fstype", 242 __DECONST(void *, "autofs"), (size_t)-1); 243 build_iovec(&iov, &iovlen, "fspath", 244 __DECONST(void *, fspath), (size_t)-1); 245 build_iovec(&iov, &iovlen, "errmsg", 246 errmsg, sizeof(errmsg)); 247 248 error = nmount(iov, iovlen, MNT_UPDATE); 249 if (error != 0) { 250 if (*errmsg != '\0') { 251 log_err(1, "cannot flush %s: %s", 252 fspath, errmsg); 253 } else { 254 log_err(1, "cannot flush %s", fspath); 255 } 256 } 257 } 258 259 static void 260 flush_caches(void) 261 { 262 struct statfs *mntbuf; 263 int i, nitems; 264 265 nitems = getmntinfo(&mntbuf, MNT_WAIT); 266 if (nitems <= 0) 267 log_err(1, "getmntinfo"); 268 269 log_debugx("flushing autofs caches"); 270 271 for (i = 0; i < nitems; i++) { 272 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) { 273 log_debugx("skipping %s, filesystem type is not autofs", 274 mntbuf[i].f_mntonname); 275 continue; 276 } 277 278 flush_autofs(mntbuf[i].f_mntonname); 279 } 280 } 281 282 static void 283 unmount_automounted(bool force) 284 { 285 struct statfs *mntbuf; 286 int i, nitems; 287 288 nitems = getmntinfo(&mntbuf, MNT_WAIT); 289 if (nitems <= 0) 290 log_err(1, "getmntinfo"); 291 292 log_debugx("unmounting automounted filesystems"); 293 294 for (i = 0; i < nitems; i++) { 295 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) { 296 log_debugx("skipping %s, filesystem type is autofs", 297 mntbuf[i].f_mntonname); 298 continue; 299 } 300 301 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) { 302 log_debugx("skipping %s, not automounted", 303 mntbuf[i].f_mntonname); 304 continue; 305 } 306 307 unmount_by_statfs(&(mntbuf[i]), force); 308 } 309 } 310 311 static void 312 usage_automount(void) 313 { 314 315 fprintf(stderr, "usage: automount [-D name=value][-o opts][-Lcfuv]\n"); 316 exit(1); 317 } 318 319 int 320 main_automount(int argc, char **argv) 321 { 322 struct node *root; 323 int ch, debug = 0, show_maps = 0; 324 char *options = NULL; 325 bool do_unmount = false, force_unmount = false, flush = false; 326 327 /* 328 * Note that in automount(8), the only purpose of variable 329 * handling is to aid in debugging maps (automount -L). 330 */ 331 defined_init(); 332 333 while ((ch = getopt(argc, argv, "D:Lfco:uv")) != -1) { 334 switch (ch) { 335 case 'D': 336 defined_parse_and_add(optarg); 337 break; 338 case 'L': 339 show_maps++; 340 break; 341 case 'c': 342 flush = true; 343 break; 344 case 'f': 345 force_unmount = true; 346 break; 347 case 'o': 348 options = concat(options, ',', optarg); 349 break; 350 case 'u': 351 do_unmount = true; 352 break; 353 case 'v': 354 debug++; 355 break; 356 case '?': 357 default: 358 usage_automount(); 359 } 360 } 361 argc -= optind; 362 if (argc != 0) 363 usage_automount(); 364 365 if (force_unmount && !do_unmount) 366 usage_automount(); 367 368 log_init(debug); 369 370 if (flush) { 371 flush_caches(); 372 return (0); 373 } 374 375 if (do_unmount) { 376 unmount_automounted(force_unmount); 377 return (0); 378 } 379 380 root = node_new_root(); 381 parse_master(root, AUTO_MASTER_PATH); 382 383 if (show_maps) { 384 if (show_maps > 1) { 385 node_expand_indirect_maps(root); 386 node_expand_ampersand(root, NULL); 387 } 388 node_expand_defined(root); 389 node_print(root, options); 390 return (0); 391 } 392 393 mount_unmount(root); 394 395 return (0); 396 } 397