1 /*- 2 * Copyright (c) 2005 Jean-Sebastien Pedron 3 * Copyright (c) 2005 Csaba Henk 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/mount.h> 34 #include <sys/uio.h> 35 #include <sys/stat.h> 36 #include <sys/sysctl.h> 37 38 #include <err.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <sysexits.h> 43 #include <unistd.h> 44 #include <fcntl.h> 45 #include <signal.h> 46 #include <getopt.h> 47 #include <limits.h> 48 #include <osreldate.h> 49 #include <paths.h> 50 51 #include "mntopts.h" 52 53 #ifndef FUSE4BSD_VERSION 54 #define FUSE4BSD_VERSION "0.3.9-pre1" 55 #endif 56 57 void __usage_short(void); 58 void usage(void); 59 void helpmsg(void); 60 void showversion(void); 61 int init_backgrounded(void); 62 63 static struct mntopt mopts[] = { 64 #define ALTF_PRIVATE 0x01 65 { "private", 0, ALTF_PRIVATE, 1 }, 66 { "neglect_shares", 0, 0x02, 1 }, 67 { "push_symlinks_in", 0, 0x04, 1 }, 68 { "allow_other", 0, 0x08, 1 }, 69 { "default_permissions", 0, 0x10, 1 }, 70 #define ALTF_MAXREAD 0x20 71 { "max_read=", 0, ALTF_MAXREAD, 1 }, 72 #define ALTF_SUBTYPE 0x40 73 { "subtype=", 0, ALTF_SUBTYPE, 1 }, 74 #define ALTF_SYNC_UNMOUNT 0x80 75 { "sync_unmount", 0, ALTF_SYNC_UNMOUNT, 1 }, 76 /* 77 * MOPT_AUTOMOUNTED, included by MOPT_STDOPTS, does not fit into 78 * the 'flags' argument to nmount(2). We have to abuse altflags 79 * to pass it, as string, via iovec. 80 */ 81 #define ALTF_AUTOMOUNTED 0x100 82 { "automounted", 0, ALTF_AUTOMOUNTED, 1 }, 83 /* Linux specific options, we silently ignore them */ 84 { "fsname=", 0, 0x00, 1 }, 85 { "fd=", 0, 0x00, 1 }, 86 { "rootmode=", 0, 0x00, 1 }, 87 { "user_id=", 0, 0x00, 1 }, 88 { "group_id=", 0, 0x00, 1 }, 89 { "large_read", 0, 0x00, 1 }, 90 /* "nonempty", just the first two chars are stripped off during parsing */ 91 { "nempty", 0, 0x00, 1 }, 92 MOPT_STDOPTS, 93 MOPT_END 94 }; 95 96 struct mntval { 97 int mv_flag; 98 void *mv_value; 99 int mv_len; 100 }; 101 102 static struct mntval mvals[] = { 103 { ALTF_MAXREAD, NULL, 0 }, 104 { ALTF_SUBTYPE, NULL, 0 }, 105 { 0, NULL, 0 } 106 }; 107 108 #define DEFAULT_MOUNT_FLAGS ALTF_PRIVATE | ALTF_SYNC_UNMOUNT 109 110 int 111 main(int argc, char *argv[]) 112 { 113 struct iovec *iov; 114 int mntflags, iovlen, verbose = 0; 115 char *dev = NULL, *dir = NULL, mntpath[MAXPATHLEN]; 116 char *devo = NULL, *diro = NULL; 117 char ndev[128], fdstr[15]; 118 int i, done = 0, reject_allow_other = 0, safe_level = 0; 119 int altflags = DEFAULT_MOUNT_FLAGS; 120 int __altflags = DEFAULT_MOUNT_FLAGS; 121 int ch = 0; 122 struct mntopt *mo; 123 struct mntval *mv; 124 static struct option longopts[] = { 125 {"reject-allow_other", no_argument, NULL, 'A'}, 126 {"safe", no_argument, NULL, 'S'}, 127 {"daemon", required_argument, NULL, 'D'}, 128 {"daemon_opts", required_argument, NULL, 'O'}, 129 {"special", required_argument, NULL, 's'}, 130 {"mountpath", required_argument, NULL, 'm'}, 131 {"version", no_argument, NULL, 'V'}, 132 {"help", no_argument, NULL, 'h'}, 133 {0,0,0,0} 134 }; 135 int pid = 0; 136 int fd = -1, fdx; 137 char *ep; 138 char *daemon_str = NULL, *daemon_opts = NULL; 139 140 /* 141 * We want a parsing routine which is not sensitive to 142 * the position of args/opts; it should extract the 143 * first two args and stop at the beginning of the rest. 144 * (This makes it easier to call mount_fusefs from external 145 * utils than it is with a strict "util flags args" syntax.) 146 */ 147 148 iov = NULL; 149 iovlen = 0; 150 mntflags = 0; 151 /* All in all, I feel it more robust this way... */ 152 unsetenv("POSIXLY_CORRECT"); 153 if (getenv("MOUNT_FUSEFS_IGNORE_UNKNOWN")) 154 getmnt_silent = 1; 155 if (getenv("MOUNT_FUSEFS_VERBOSE")) 156 verbose = 1; 157 158 do { 159 for (i = 0; i < 3; i++) { 160 if (optind < argc && argv[optind][0] != '-') { 161 if (dir) { 162 done = 1; 163 break; 164 } 165 if (dev) 166 dir = argv[optind]; 167 else 168 dev = argv[optind]; 169 optind++; 170 } 171 } 172 switch(ch) { 173 case 'A': 174 reject_allow_other = 1; 175 break; 176 case 'S': 177 safe_level = 1; 178 break; 179 case 'D': 180 if (daemon_str) 181 errx(1, "daemon specified inconsistently"); 182 daemon_str = optarg; 183 break; 184 case 'O': 185 if (daemon_opts) 186 errx(1, "daemon opts specified inconsistently"); 187 daemon_opts = optarg; 188 break; 189 case 'o': 190 getmntopts(optarg, mopts, &mntflags, &altflags); 191 for (mv = mvals; mv->mv_flag; ++mv) { 192 if (! (altflags & mv->mv_flag)) 193 continue; 194 for (mo = mopts; mo->m_flag; ++mo) { 195 char *p, *q; 196 197 if (mo->m_flag != mv->mv_flag) 198 continue; 199 p = strstr(optarg, mo->m_option); 200 if (p) { 201 p += strlen(mo->m_option); 202 q = p; 203 while (*q != '\0' && *q != ',') 204 q++; 205 mv->mv_len = q - p + 1; 206 mv->mv_value = malloc(mv->mv_len); 207 memcpy(mv->mv_value, p, mv->mv_len - 1); 208 ((char *)mv->mv_value)[mv->mv_len - 1] = '\0'; 209 break; 210 } 211 } 212 } 213 break; 214 case 's': 215 if (devo) 216 errx(1, "special specified inconsistently"); 217 devo = optarg; 218 break; 219 case 'm': 220 if (diro) 221 errx(1, "mount path specified inconsistently"); 222 diro = optarg; 223 break; 224 case 'v': 225 verbose = 1; 226 break; 227 case 'h': 228 helpmsg(); 229 break; 230 case 'V': 231 showversion(); 232 break; 233 case '\0': 234 break; 235 case '?': 236 default: 237 usage(); 238 } 239 if (done) 240 break; 241 } while ((ch = getopt_long(argc, argv, "AvVho:SD:O:s:m:", longopts, NULL)) != -1); 242 243 argc -= optind; 244 argv += optind; 245 246 if (devo) { 247 if (dev) 248 errx(1, "special specified inconsistently"); 249 dev = devo; 250 } else if (diro) 251 errx(1, "if mountpoint is given via an option, special should also be given via an option"); 252 253 if (diro) { 254 if (dir) 255 errx(1, "mount path specified inconsistently"); 256 dir = diro; 257 } 258 259 if ((! dev) && argc > 0) { 260 dev = *argv++; 261 argc--; 262 } 263 264 if ((! dir) && argc > 0) { 265 dir = *argv++; 266 argc--; 267 } 268 269 if (! (dev && dir)) 270 errx(1, "missing special and/or mountpoint"); 271 272 for (mo = mopts; mo->m_flag; ++mo) { 273 if (altflags & mo->m_flag) { 274 int iov_done = 0; 275 276 if (reject_allow_other && 277 strcmp(mo->m_option, "allow_other") == 0) 278 /* 279 * reject_allow_other is stronger than a 280 * negative of allow_other: if this is set, 281 * allow_other is blocked, period. 282 */ 283 errx(1, "\"allow_other\" usage is banned by respective option"); 284 285 for (mv = mvals; mv->mv_flag; ++mv) { 286 if (mo->m_flag != mv->mv_flag) 287 continue; 288 if (mv->mv_value) { 289 build_iovec(&iov, &iovlen, mo->m_option, mv->mv_value, mv->mv_len); 290 iov_done = 1; 291 break; 292 } 293 } 294 if (! iov_done) 295 build_iovec(&iov, &iovlen, mo->m_option, 296 __DECONST(void *, ""), -1); 297 } 298 if (__altflags & mo->m_flag) { 299 char *uscore_opt; 300 301 if (asprintf(&uscore_opt, "__%s", mo->m_option) == -1) 302 err(1, "failed to allocate memory"); 303 build_iovec(&iov, &iovlen, uscore_opt, 304 __DECONST(void *, ""), -1); 305 free(uscore_opt); 306 } 307 } 308 309 if (getenv("MOUNT_FUSEFS_SAFE")) 310 safe_level = 1; 311 312 if (safe_level > 0 && (argc > 0 || daemon_str || daemon_opts)) 313 errx(1, "safe mode, spawning daemon not allowed"); 314 315 if ((argc > 0 && (daemon_str || daemon_opts)) || 316 (daemon_opts && ! daemon_str)) 317 errx(1, "daemon specified inconsistently"); 318 319 /* 320 * Resolve the mountpoint with realpath(3) and remove unnecessary 321 * slashes from the devicename if there are any. 322 */ 323 if (checkpath(dir, mntpath) != 0) 324 err(1, "%s", mntpath); 325 (void)rmslashes(dev, dev); 326 327 if (strcmp(dev, "auto") == 0) 328 dev = __DECONST(char *, "/dev/fuse"); 329 330 if (strcmp(dev, "/dev/fuse") == 0) { 331 if (! (argc > 0 || daemon_str)) { 332 fprintf(stderr, "Please also specify the fuse daemon to run when mounting via the multiplexer!\n"); 333 usage(); 334 } 335 if ((fd = open(dev, O_RDWR)) < 0) 336 err(1, "failed to open fuse device"); 337 } else { 338 fdx = strtol(dev, &ep, 10); 339 if (*ep == '\0') 340 fd = fdx; 341 } 342 343 /* Identifying device */ 344 if (fd >= 0) { 345 struct stat sbuf; 346 char *ndevbas, *lep; 347 348 if (fstat(fd, &sbuf) == -1) 349 err(1, "cannot stat device file descriptor"); 350 351 strcpy(ndev, _PATH_DEV); 352 ndevbas = ndev + strlen(_PATH_DEV); 353 devname_r(sbuf.st_rdev, S_IFCHR, ndevbas, 354 sizeof(ndev) - strlen(_PATH_DEV)); 355 356 if (strncmp(ndevbas, "fuse", 4)) 357 errx(1, "mounting inappropriate device"); 358 359 strtol(ndevbas + 4, &lep, 10); 360 if (*lep != '\0') 361 errx(1, "mounting inappropriate device"); 362 363 dev = ndev; 364 } 365 366 if (argc > 0 || daemon_str) { 367 char *fds; 368 369 if (fd < 0 && (fd = open(dev, O_RDWR)) < 0) 370 err(1, "failed to open fuse device"); 371 372 if (asprintf(&fds, "%d", fd) == -1) 373 err(1, "failed to allocate memory"); 374 setenv("FUSE_DEV_FD", fds, 1); 375 free(fds); 376 setenv("FUSE_NO_MOUNT", "1", 1); 377 378 if (daemon_str) { 379 char *bgdaemon; 380 int len; 381 382 if (! daemon_opts) 383 daemon_opts = __DECONST(char *, ""); 384 385 len = strlen(daemon_str) + 1 + strlen(daemon_opts) + 386 2 + 1; 387 bgdaemon = calloc(1, len); 388 389 if (! bgdaemon) 390 err(1, "failed to allocate memory"); 391 392 strlcpy(bgdaemon, daemon_str, len); 393 strlcat(bgdaemon, " ", len); 394 strlcat(bgdaemon, daemon_opts, len); 395 strlcat(bgdaemon, " &", len); 396 397 if (system(bgdaemon)) 398 err(1, "failed to call fuse daemon"); 399 } else { 400 if ((pid = fork()) < 0) 401 err(1, "failed to fork for fuse daemon"); 402 403 if (pid == 0) { 404 execvp(argv[0], argv); 405 err(1, "failed to exec fuse daemon"); 406 } 407 } 408 } 409 410 if (fd >= 0 && ! init_backgrounded() && close(fd) < 0) { 411 if (pid) 412 kill(pid, SIGKILL); 413 err(1, "failed to close fuse device"); 414 } 415 416 /* Prepare the options vector for nmount(). build_iovec() is declared 417 * in mntopts.h. */ 418 sprintf(fdstr, "%d", fd); 419 build_iovec(&iov, &iovlen, "fstype", __DECONST(void *, "fusefs"), -1); 420 build_iovec(&iov, &iovlen, "fspath", mntpath, -1); 421 build_iovec(&iov, &iovlen, "from", dev, -1); 422 build_iovec(&iov, &iovlen, "fd", fdstr, -1); 423 424 if (verbose) 425 fprintf(stderr, "mounting fuse daemon on device %s\n", dev); 426 427 if (nmount(iov, iovlen, mntflags) < 0) 428 err(EX_OSERR, "%s on %s", dev, mntpath); 429 430 exit(0); 431 } 432 433 void 434 __usage_short(void) { 435 fprintf(stderr, 436 "usage:\n%s [-A|-S|-v|-V|-h|-D daemon|-O args|-s special|-m node|-o option...] special node [daemon args...]\n\n", 437 getprogname()); 438 } 439 440 void 441 usage(void) 442 { 443 struct mntopt *mo; 444 445 __usage_short(); 446 447 fprintf(stderr, "known options:\n"); 448 for (mo = mopts; mo->m_flag; ++mo) 449 fprintf(stderr, "\t%s\n", mo->m_option); 450 451 fprintf(stderr, "\n(use -h for a detailed description of these options)\n"); 452 exit(EX_USAGE); 453 } 454 455 void 456 helpmsg(void) 457 { 458 if (! getenv("MOUNT_FUSEFS_CALL_BY_LIB")) { 459 __usage_short(); 460 fprintf(stderr, "description of options:\n"); 461 } 462 463 /* 464 * The main use case of this function is giving info embedded in general 465 * FUSE lib help output. Therefore the style and the content of the output 466 * tries to fit there as much as possible. 467 */ 468 fprintf(stderr, 469 " -o allow_other allow access to other users\n" 470 /* " -o nonempty allow mounts over non-empty file/dir\n" */ 471 " -o default_permissions enable permission checking by kernel\n" 472 /* 473 " -o fsname=NAME set filesystem name\n" 474 " -o large_read issue large read requests (2.4 only)\n" 475 */ 476 " -o subtype=NAME set filesystem type\n" 477 " -o max_read=N set maximum size of read requests\n" 478 " -o noprivate allow secondary mounting of the filesystem\n" 479 " -o neglect_shares don't report EBUSY when unmount attempted\n" 480 " in presence of secondary mounts\n" 481 " -o push_symlinks_in prefix absolute symlinks with mountpoint\n" 482 " -o sync_unmount do unmount synchronously\n" 483 ); 484 exit(EX_USAGE); 485 } 486 487 void 488 showversion(void) 489 { 490 puts("mount_fusefs [fuse4bsd] version: " FUSE4BSD_VERSION); 491 exit(EX_USAGE); 492 } 493 494 int 495 init_backgrounded(void) 496 { 497 int ibg; 498 size_t len; 499 500 len = sizeof(ibg); 501 502 if (sysctlbyname("vfs.fuse.init_backgrounded", &ibg, &len, NULL, 0)) 503 return (0); 504 505 return (ibg); 506 } 507