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 /* Linux specific options, we silently ignore them */ 77 { "fsname=", 0, 0x00, 1 }, 78 { "fd=", 0, 0x00, 1 }, 79 { "rootmode=", 0, 0x00, 1 }, 80 { "user_id=", 0, 0x00, 1 }, 81 { "group_id=", 0, 0x00, 1 }, 82 { "large_read", 0, 0x00, 1 }, 83 /* "nonempty", just the first two chars are stripped off during parsing */ 84 { "nempty", 0, 0x00, 1 }, 85 MOPT_STDOPTS, 86 MOPT_END 87 }; 88 89 struct mntval { 90 int mv_flag; 91 void *mv_value; 92 int mv_len; 93 }; 94 95 static struct mntval mvals[] = { 96 { ALTF_MAXREAD, NULL, 0 }, 97 { ALTF_SUBTYPE, NULL, 0 }, 98 { 0, NULL, 0 } 99 }; 100 101 #define DEFAULT_MOUNT_FLAGS ALTF_PRIVATE | ALTF_SYNC_UNMOUNT 102 103 int 104 main(int argc, char *argv[]) 105 { 106 struct iovec *iov; 107 int mntflags, iovlen, verbose = 0; 108 char *dev = NULL, *dir = NULL, mntpath[MAXPATHLEN]; 109 char *devo = NULL, *diro = NULL; 110 char ndev[128], fdstr[15]; 111 int i, done = 0, reject_allow_other = 0, safe_level = 0; 112 int altflags = DEFAULT_MOUNT_FLAGS; 113 int __altflags = DEFAULT_MOUNT_FLAGS; 114 int ch = 0; 115 struct mntopt *mo; 116 struct mntval *mv; 117 static struct option longopts[] = { 118 {"reject-allow_other", no_argument, NULL, 'A'}, 119 {"safe", no_argument, NULL, 'S'}, 120 {"daemon", required_argument, NULL, 'D'}, 121 {"daemon_opts", required_argument, NULL, 'O'}, 122 {"special", required_argument, NULL, 's'}, 123 {"mountpath", required_argument, NULL, 'm'}, 124 {"version", no_argument, NULL, 'V'}, 125 {"help", no_argument, NULL, 'h'}, 126 {0,0,0,0} 127 }; 128 int pid = 0; 129 int fd = -1, fdx; 130 char *ep; 131 char *daemon_str = NULL, *daemon_opts = NULL; 132 133 /* 134 * We want a parsing routine which is not sensitive to 135 * the position of args/opts; it should extract the 136 * first two args and stop at the beginning of the rest. 137 * (This makes it easier to call mount_fusefs from external 138 * utils than it is with a strict "util flags args" syntax.) 139 */ 140 141 iov = NULL; 142 iovlen = 0; 143 mntflags = 0; 144 /* All in all, I feel it more robust this way... */ 145 unsetenv("POSIXLY_CORRECT"); 146 if (getenv("MOUNT_FUSEFS_IGNORE_UNKNOWN")) 147 getmnt_silent = 1; 148 if (getenv("MOUNT_FUSEFS_VERBOSE")) 149 verbose = 1; 150 151 do { 152 for (i = 0; i < 3; i++) { 153 if (optind < argc && argv[optind][0] != '-') { 154 if (dir) { 155 done = 1; 156 break; 157 } 158 if (dev) 159 dir = argv[optind]; 160 else 161 dev = argv[optind]; 162 optind++; 163 } 164 } 165 switch(ch) { 166 case 'A': 167 reject_allow_other = 1; 168 break; 169 case 'S': 170 safe_level = 1; 171 break; 172 case 'D': 173 if (daemon_str) 174 errx(1, "daemon specified inconsistently"); 175 daemon_str = optarg; 176 break; 177 case 'O': 178 if (daemon_opts) 179 errx(1, "daemon opts specified inconsistently"); 180 daemon_opts = optarg; 181 break; 182 case 'o': 183 getmntopts(optarg, mopts, &mntflags, &altflags); 184 for (mv = mvals; mv->mv_flag; ++mv) { 185 if (! (altflags & mv->mv_flag)) 186 continue; 187 for (mo = mopts; mo->m_flag; ++mo) { 188 char *p, *q; 189 190 if (mo->m_flag != mv->mv_flag) 191 continue; 192 p = strstr(optarg, mo->m_option); 193 if (p) { 194 p += strlen(mo->m_option); 195 q = p; 196 while (*q != '\0' && *q != ',') 197 q++; 198 mv->mv_len = q - p + 1; 199 mv->mv_value = malloc(mv->mv_len); 200 memcpy(mv->mv_value, p, mv->mv_len - 1); 201 ((char *)mv->mv_value)[mv->mv_len - 1] = '\0'; 202 break; 203 } 204 } 205 } 206 break; 207 case 's': 208 if (devo) 209 errx(1, "special specified inconsistently"); 210 devo = optarg; 211 break; 212 case 'm': 213 if (diro) 214 errx(1, "mount path specified inconsistently"); 215 diro = optarg; 216 break; 217 case 'v': 218 verbose = 1; 219 break; 220 case 'h': 221 helpmsg(); 222 break; 223 case 'V': 224 showversion(); 225 break; 226 case '\0': 227 break; 228 case '?': 229 default: 230 usage(); 231 } 232 if (done) 233 break; 234 } while ((ch = getopt_long(argc, argv, "AvVho:SD:O:s:m:", longopts, NULL)) != -1); 235 236 argc -= optind; 237 argv += optind; 238 239 if (devo) { 240 if (dev) 241 errx(1, "special specified inconsistently"); 242 dev = devo; 243 } else if (diro) 244 errx(1, "if mountpoint is given via an option, special should also be given via an option"); 245 246 if (diro) { 247 if (dir) 248 errx(1, "mount path specified inconsistently"); 249 dir = diro; 250 } 251 252 if ((! dev) && argc > 0) { 253 dev = *argv++; 254 argc--; 255 } 256 257 if ((! dir) && argc > 0) { 258 dir = *argv++; 259 argc--; 260 } 261 262 if (! (dev && dir)) 263 errx(1, "missing special and/or mountpoint"); 264 265 for (mo = mopts; mo->m_flag; ++mo) { 266 if (altflags & mo->m_flag) { 267 int iov_done = 0; 268 269 if (reject_allow_other && 270 strcmp(mo->m_option, "allow_other") == 0) 271 /* 272 * reject_allow_other is stronger than a 273 * negative of allow_other: if this is set, 274 * allow_other is blocked, period. 275 */ 276 errx(1, "\"allow_other\" usage is banned by respective option"); 277 278 for (mv = mvals; mv->mv_flag; ++mv) { 279 if (mo->m_flag != mv->mv_flag) 280 continue; 281 if (mv->mv_value) { 282 build_iovec(&iov, &iovlen, mo->m_option, mv->mv_value, mv->mv_len); 283 iov_done = 1; 284 break; 285 } 286 } 287 if (! iov_done) 288 build_iovec(&iov, &iovlen, mo->m_option, 289 __DECONST(void *, ""), -1); 290 } 291 if (__altflags & mo->m_flag) { 292 char *uscore_opt; 293 294 if (asprintf(&uscore_opt, "__%s", mo->m_option) == -1) 295 err(1, "failed to allocate memory"); 296 build_iovec(&iov, &iovlen, uscore_opt, 297 __DECONST(void *, ""), -1); 298 free(uscore_opt); 299 } 300 } 301 302 if (getenv("MOUNT_FUSEFS_SAFE")) 303 safe_level = 1; 304 305 if (safe_level > 0 && (argc > 0 || daemon_str || daemon_opts)) 306 errx(1, "safe mode, spawning daemon not allowed"); 307 308 if ((argc > 0 && (daemon_str || daemon_opts)) || 309 (daemon_opts && ! daemon_str)) 310 errx(1, "daemon specified inconsistently"); 311 312 /* 313 * Resolve the mountpoint with realpath(3) and remove unnecessary 314 * slashes from the devicename if there are any. 315 */ 316 if (checkpath(dir, mntpath) != 0) 317 err(1, "%s", mntpath); 318 (void)rmslashes(dev, dev); 319 320 if (strcmp(dev, "auto") == 0) 321 dev = __DECONST(char *, "/dev/fuse"); 322 323 if (strcmp(dev, "/dev/fuse") == 0) { 324 if (! (argc > 0 || daemon_str)) { 325 fprintf(stderr, "Please also specify the fuse daemon to run when mounting via the multiplexer!\n"); 326 usage(); 327 } 328 if ((fd = open(dev, O_RDWR)) < 0) 329 err(1, "failed to open fuse device"); 330 } else { 331 fdx = strtol(dev, &ep, 10); 332 if (*ep == '\0') 333 fd = fdx; 334 } 335 336 /* Identifying device */ 337 if (fd >= 0) { 338 struct stat sbuf; 339 char *ndevbas, *lep; 340 341 if (fstat(fd, &sbuf) == -1) 342 err(1, "cannot stat device file descriptor"); 343 344 strcpy(ndev, _PATH_DEV); 345 ndevbas = ndev + strlen(_PATH_DEV); 346 devname_r(sbuf.st_rdev, S_IFCHR, ndevbas, 347 sizeof(ndev) - strlen(_PATH_DEV)); 348 349 if (strncmp(ndevbas, "fuse", 4)) 350 errx(1, "mounting inappropriate device"); 351 352 strtol(ndevbas + 4, &lep, 10); 353 if (*lep != '\0') 354 errx(1, "mounting inappropriate device"); 355 356 dev = ndev; 357 } 358 359 if (argc > 0 || daemon_str) { 360 char *fds; 361 362 if (fd < 0 && (fd = open(dev, O_RDWR)) < 0) 363 err(1, "failed to open fuse device"); 364 365 if (asprintf(&fds, "%d", fd) == -1) 366 err(1, "failed to allocate memory"); 367 setenv("FUSE_DEV_FD", fds, 1); 368 free(fds); 369 setenv("FUSE_NO_MOUNT", "1", 1); 370 371 if (daemon_str) { 372 char *bgdaemon; 373 int len; 374 375 if (! daemon_opts) 376 daemon_opts = __DECONST(char *, ""); 377 378 len = strlen(daemon_str) + 1 + strlen(daemon_opts) + 379 2 + 1; 380 bgdaemon = calloc(1, len); 381 382 if (! bgdaemon) 383 err(1, "failed to allocate memory"); 384 385 strlcpy(bgdaemon, daemon_str, len); 386 strlcat(bgdaemon, " ", len); 387 strlcat(bgdaemon, daemon_opts, len); 388 strlcat(bgdaemon, " &", len); 389 390 if (system(bgdaemon)) 391 err(1, "failed to call fuse daemon"); 392 } else { 393 if ((pid = fork()) < 0) 394 err(1, "failed to fork for fuse daemon"); 395 396 if (pid == 0) { 397 execvp(argv[0], argv); 398 err(1, "failed to exec fuse daemon"); 399 } 400 } 401 } 402 403 if (fd >= 0 && ! init_backgrounded() && close(fd) < 0) { 404 if (pid) 405 kill(pid, SIGKILL); 406 err(1, "failed to close fuse device"); 407 } 408 409 /* Prepare the options vector for nmount(). build_iovec() is declared 410 * in mntopts.h. */ 411 sprintf(fdstr, "%d", fd); 412 build_iovec(&iov, &iovlen, "fstype", __DECONST(void *, "fusefs"), -1); 413 build_iovec(&iov, &iovlen, "fspath", mntpath, -1); 414 build_iovec(&iov, &iovlen, "from", dev, -1); 415 build_iovec(&iov, &iovlen, "fd", fdstr, -1); 416 417 if (verbose) 418 fprintf(stderr, "mounting fuse daemon on device %s\n", dev); 419 420 if (nmount(iov, iovlen, mntflags) < 0) 421 err(EX_OSERR, "%s on %s", dev, mntpath); 422 423 exit(0); 424 } 425 426 void 427 __usage_short(void) { 428 fprintf(stderr, 429 "usage:\n%s [-A|-S|-v|-V|-h|-D daemon|-O args|-s special|-m node|-o option...] special node [daemon args...]\n\n", 430 getprogname()); 431 } 432 433 void 434 usage(void) 435 { 436 struct mntopt *mo; 437 438 __usage_short(); 439 440 fprintf(stderr, "known options:\n"); 441 for (mo = mopts; mo->m_flag; ++mo) 442 fprintf(stderr, "\t%s\n", mo->m_option); 443 444 fprintf(stderr, "\n(use -h for a detailed description of these options)\n"); 445 exit(EX_USAGE); 446 } 447 448 void 449 helpmsg(void) 450 { 451 if (! getenv("MOUNT_FUSEFS_CALL_BY_LIB")) { 452 __usage_short(); 453 fprintf(stderr, "description of options:\n"); 454 } 455 456 /* 457 * The main use case of this function is giving info embedded in general 458 * FUSE lib help output. Therefore the style and the content of the output 459 * tries to fit there as much as possible. 460 */ 461 fprintf(stderr, 462 " -o allow_other allow access to other users\n" 463 /* " -o nonempty allow mounts over non-empty file/dir\n" */ 464 " -o default_permissions enable permission checking by kernel\n" 465 /* 466 " -o fsname=NAME set filesystem name\n" 467 " -o large_read issue large read requests (2.4 only)\n" 468 */ 469 " -o subtype=NAME set filesystem type\n" 470 " -o max_read=N set maximum size of read requests\n" 471 " -o noprivate allow secondary mounting of the filesystem\n" 472 " -o neglect_shares don't report EBUSY when unmount attempted\n" 473 " in presence of secondary mounts\n" 474 " -o push_symlinks_in prefix absolute symlinks with mountpoint\n" 475 " -o sync_unmount do unmount synchronously\n" 476 ); 477 exit(EX_USAGE); 478 } 479 480 void 481 showversion(void) 482 { 483 puts("mount_fusefs [fuse4bsd] version: " FUSE4BSD_VERSION); 484 exit(EX_USAGE); 485 } 486 487 int 488 init_backgrounded(void) 489 { 490 int ibg; 491 size_t len; 492 493 len = sizeof(ibg); 494 495 if (sysctlbyname("vfs.fuse.init_backgrounded", &ibg, &len, NULL, 0)) 496 return (0); 497 498 return (ibg); 499 } 500