bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
| 3 | Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> |
| 4 | |
| 5 | This program can be distributed under the terms of the GNU LGPLv2. |
| 6 | See the file COPYING.LIB. |
| 7 | */ |
| 8 | |
| 9 | #include "config.h" |
| 10 | #include "fuse_i.h" |
| 11 | #include "fuse_misc.h" |
| 12 | #include "fuse_opt.h" |
| 13 | #include "fuse_lowlevel.h" |
| 14 | #include "fuse_common_compat.h" |
| 15 | |
| 16 | #include <stdio.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <stddef.h> |
| 19 | #include <unistd.h> |
| 20 | #include <string.h> |
| 21 | #include <limits.h> |
| 22 | #include <errno.h> |
| 23 | #include <sys/param.h> |
| 24 | |
| 25 | enum { |
| 26 | KEY_HELP, |
| 27 | KEY_HELP_NOHEADER, |
| 28 | KEY_VERSION, |
| 29 | }; |
| 30 | |
| 31 | struct helper_opts { |
| 32 | int singlethread; |
| 33 | int foreground; |
| 34 | int nodefault_subtype; |
| 35 | char *mountpoint; |
| 36 | }; |
| 37 | |
| 38 | #define FUSE_HELPER_OPT(t, p) { t, offsetof(struct helper_opts, p), 1 } |
| 39 | |
| 40 | static const struct fuse_opt fuse_helper_opts[] = { |
| 41 | FUSE_HELPER_OPT("-d", foreground), |
| 42 | FUSE_HELPER_OPT("debug", foreground), |
| 43 | FUSE_HELPER_OPT("-f", foreground), |
| 44 | FUSE_HELPER_OPT("-s", singlethread), |
| 45 | FUSE_HELPER_OPT("fsname=", nodefault_subtype), |
| 46 | FUSE_HELPER_OPT("subtype=", nodefault_subtype), |
| 47 | |
| 48 | FUSE_OPT_KEY("-h", KEY_HELP), |
| 49 | FUSE_OPT_KEY("--help", KEY_HELP), |
| 50 | FUSE_OPT_KEY("-ho", KEY_HELP_NOHEADER), |
| 51 | FUSE_OPT_KEY("-V", KEY_VERSION), |
| 52 | FUSE_OPT_KEY("--version", KEY_VERSION), |
| 53 | FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP), |
| 54 | FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP), |
| 55 | FUSE_OPT_KEY("fsname=", FUSE_OPT_KEY_KEEP), |
| 56 | FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_KEEP), |
| 57 | FUSE_OPT_END |
| 58 | }; |
| 59 | |
| 60 | static void usage(const char *progname) |
| 61 | { |
| 62 | fprintf(stderr, |
| 63 | "usage: %s mountpoint [options]\n\n", progname); |
| 64 | fprintf(stderr, |
| 65 | "general options:\n" |
| 66 | " -o opt,[opt...] mount options\n" |
| 67 | " -h --help print help\n" |
| 68 | " -V --version print version\n" |
| 69 | "\n"); |
| 70 | } |
| 71 | |
| 72 | static void helper_help(void) |
| 73 | { |
| 74 | fprintf(stderr, |
| 75 | "FUSE options:\n" |
| 76 | " -d -o debug enable debug output (implies -f)\n" |
| 77 | " -f foreground operation\n" |
| 78 | " -s disable multi-threaded operation\n" |
| 79 | "\n" |
| 80 | ); |
| 81 | } |
| 82 | |
| 83 | static void helper_version(void) |
| 84 | { |
| 85 | fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION); |
| 86 | } |
| 87 | |
| 88 | static int fuse_helper_opt_proc(void *data, const char *arg, int key, |
| 89 | struct fuse_args *outargs) |
| 90 | { |
| 91 | struct helper_opts *hopts = data; |
| 92 | |
| 93 | switch (key) { |
| 94 | case KEY_HELP: |
| 95 | usage(outargs->argv[0]); |
| 96 | /* fall through */ |
| 97 | |
| 98 | case KEY_HELP_NOHEADER: |
| 99 | helper_help(); |
| 100 | return fuse_opt_add_arg(outargs, "-h"); |
| 101 | |
| 102 | case KEY_VERSION: |
| 103 | helper_version(); |
| 104 | return 1; |
| 105 | |
| 106 | case FUSE_OPT_KEY_NONOPT: |
| 107 | if (!hopts->mountpoint) { |
| 108 | char mountpoint[PATH_MAX]; |
| 109 | if (realpath(arg, mountpoint) == NULL) { |
| 110 | fprintf(stderr, |
| 111 | "fuse: bad mount point `%s': %s\n", |
| 112 | arg, strerror(errno)); |
| 113 | return -1; |
| 114 | } |
| 115 | return fuse_opt_add_opt(&hopts->mountpoint, mountpoint); |
| 116 | } else { |
| 117 | fprintf(stderr, "fuse: invalid argument `%s'\n", arg); |
| 118 | return -1; |
| 119 | } |
| 120 | |
| 121 | default: |
| 122 | return 1; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static int add_default_subtype(const char *progname, struct fuse_args *args) |
| 127 | { |
| 128 | int res; |
| 129 | char *subtype_opt; |
| 130 | const char *basename = strrchr(progname, '/'); |
| 131 | if (basename == NULL) |
| 132 | basename = progname; |
| 133 | else if (basename[1] != '\0') |
| 134 | basename++; |
| 135 | |
| 136 | subtype_opt = (char *) malloc(strlen(basename) + 64); |
| 137 | if (subtype_opt == NULL) { |
| 138 | fprintf(stderr, "fuse: memory allocation failed\n"); |
| 139 | return -1; |
| 140 | } |
| 141 | sprintf(subtype_opt, "-osubtype=%s", basename); |
| 142 | res = fuse_opt_add_arg(args, subtype_opt); |
| 143 | free(subtype_opt); |
| 144 | return res; |
| 145 | } |
| 146 | |
| 147 | int fuse_parse_cmdline(struct fuse_args *args, char **mountpoint, |
| 148 | int *multithreaded, int *foreground) |
| 149 | { |
| 150 | int res; |
| 151 | struct helper_opts hopts; |
| 152 | |
| 153 | memset(&hopts, 0, sizeof(hopts)); |
| 154 | res = fuse_opt_parse(args, &hopts, fuse_helper_opts, |
| 155 | fuse_helper_opt_proc); |
| 156 | if (res == -1) |
| 157 | return -1; |
| 158 | |
| 159 | if (!hopts.nodefault_subtype) { |
| 160 | res = add_default_subtype(args->argv[0], args); |
| 161 | if (res == -1) |
| 162 | goto err; |
| 163 | } |
| 164 | if (mountpoint) |
| 165 | *mountpoint = hopts.mountpoint; |
| 166 | else |
| 167 | free(hopts.mountpoint); |
| 168 | |
| 169 | if (multithreaded) |
| 170 | *multithreaded = !hopts.singlethread; |
| 171 | if (foreground) |
| 172 | *foreground = hopts.foreground; |
| 173 | return 0; |
| 174 | |
| 175 | err: |
| 176 | free(hopts.mountpoint); |
| 177 | return -1; |
| 178 | } |
| 179 | |
| 180 | int fuse_daemonize(int foreground) |
| 181 | { |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 182 | if (!foreground) { |
Dees_Troy | e34c133 | 2013-02-06 19:13:00 +0000 | [diff] [blame] | 183 | int nullfd; |
| 184 | |
| 185 | /* |
| 186 | * demonize current process by forking it and killing the |
| 187 | * parent. This makes current process as a child of 'init'. |
| 188 | */ |
| 189 | switch(fork()) { |
| 190 | case -1: |
| 191 | perror("fuse_daemonize: fork"); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 192 | return -1; |
Dees_Troy | e34c133 | 2013-02-06 19:13:00 +0000 | [diff] [blame] | 193 | case 0: |
| 194 | break; |
| 195 | default: |
| 196 | _exit(0); |
| 197 | } |
| 198 | |
| 199 | if (setsid() == -1) { |
| 200 | perror("fuse_daemonize: setsid"); |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | (void) chdir("/"); |
| 205 | |
| 206 | nullfd = open("/dev/null", O_RDWR, 0); |
| 207 | if (nullfd != -1) { |
| 208 | (void) dup2(nullfd, 0); |
| 209 | (void) dup2(nullfd, 1); |
| 210 | (void) dup2(nullfd, 2); |
| 211 | if (nullfd > 2) |
| 212 | close(nullfd); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 213 | } |
| 214 | } |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static struct fuse_chan *fuse_mount_common(const char *mountpoint, |
| 219 | struct fuse_args *args) |
| 220 | { |
| 221 | struct fuse_chan *ch; |
| 222 | int fd; |
| 223 | |
| 224 | /* |
| 225 | * Make sure file descriptors 0, 1 and 2 are open, otherwise chaos |
| 226 | * would ensue. |
| 227 | */ |
| 228 | do { |
| 229 | fd = open("/dev/null", O_RDWR); |
| 230 | if (fd > 2) |
| 231 | close(fd); |
| 232 | } while (fd >= 0 && fd <= 2); |
| 233 | |
| 234 | fd = fuse_mount_compat25(mountpoint, args); |
| 235 | if (fd == -1) |
| 236 | return NULL; |
| 237 | |
| 238 | ch = fuse_kern_chan_new(fd); |
| 239 | if (!ch) |
| 240 | fuse_kern_unmount(mountpoint, fd); |
| 241 | |
| 242 | return ch; |
| 243 | } |
| 244 | |
| 245 | struct fuse_chan *fuse_mount(const char *mountpoint, struct fuse_args *args) |
| 246 | { |
| 247 | return fuse_mount_common(mountpoint, args); |
| 248 | } |
| 249 | |
| 250 | static void fuse_unmount_common(const char *mountpoint, struct fuse_chan *ch) |
| 251 | { |
Matt Mower | 523a059 | 2015-12-13 11:31:00 -0600 | [diff] [blame^] | 252 | if (mountpoint) { |
| 253 | int fd = ch ? fuse_chan_clearfd(ch) : -1; |
| 254 | fuse_kern_unmount(mountpoint, fd); |
| 255 | if (ch) |
| 256 | fuse_chan_destroy(ch); |
| 257 | } |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | void fuse_unmount(const char *mountpoint, struct fuse_chan *ch) |
| 261 | { |
| 262 | fuse_unmount_common(mountpoint, ch); |
| 263 | } |
| 264 | |
| 265 | struct fuse *fuse_setup_common(int argc, char *argv[], |
| 266 | const struct fuse_operations *op, |
| 267 | size_t op_size, |
| 268 | char **mountpoint, |
| 269 | int *multithreaded, |
| 270 | int *fd, |
| 271 | void *user_data, |
| 272 | int compat) |
| 273 | { |
| 274 | struct fuse_args args = FUSE_ARGS_INIT(argc, argv); |
| 275 | struct fuse_chan *ch; |
| 276 | struct fuse *fuse; |
| 277 | int foreground; |
| 278 | int res; |
| 279 | |
| 280 | res = fuse_parse_cmdline(&args, mountpoint, multithreaded, &foreground); |
| 281 | if (res == -1) |
| 282 | return NULL; |
| 283 | |
| 284 | ch = fuse_mount_common(*mountpoint, &args); |
| 285 | if (!ch) { |
| 286 | fuse_opt_free_args(&args); |
| 287 | goto err_free; |
| 288 | } |
| 289 | |
| 290 | fuse = fuse_new_common(ch, &args, op, op_size, user_data, compat); |
| 291 | fuse_opt_free_args(&args); |
| 292 | if (fuse == NULL) |
| 293 | goto err_unmount; |
| 294 | |
| 295 | res = fuse_daemonize(foreground); |
| 296 | if (res == -1) |
| 297 | goto err_unmount; |
| 298 | |
| 299 | res = fuse_set_signal_handlers(fuse_get_session(fuse)); |
| 300 | if (res == -1) |
| 301 | goto err_unmount; |
| 302 | |
| 303 | if (fd) |
| 304 | *fd = fuse_chan_fd(ch); |
| 305 | |
| 306 | return fuse; |
| 307 | |
| 308 | err_unmount: |
| 309 | fuse_unmount_common(*mountpoint, ch); |
| 310 | if (fuse) |
| 311 | fuse_destroy(fuse); |
| 312 | err_free: |
| 313 | free(*mountpoint); |
| 314 | return NULL; |
| 315 | } |
| 316 | |
| 317 | struct fuse *fuse_setup(int argc, char *argv[], |
| 318 | const struct fuse_operations *op, size_t op_size, |
| 319 | char **mountpoint, int *multithreaded, void *user_data) |
| 320 | { |
| 321 | return fuse_setup_common(argc, argv, op, op_size, mountpoint, |
| 322 | multithreaded, NULL, user_data, 0); |
| 323 | } |
| 324 | |
| 325 | static void fuse_teardown_common(struct fuse *fuse, char *mountpoint) |
| 326 | { |
| 327 | struct fuse_session *se = fuse_get_session(fuse); |
| 328 | struct fuse_chan *ch = fuse_session_next_chan(se, NULL); |
| 329 | fuse_remove_signal_handlers(se); |
| 330 | fuse_unmount_common(mountpoint, ch); |
| 331 | fuse_destroy(fuse); |
| 332 | free(mountpoint); |
| 333 | } |
| 334 | |
| 335 | void fuse_teardown(struct fuse *fuse, char *mountpoint) |
| 336 | { |
| 337 | fuse_teardown_common(fuse, mountpoint); |
| 338 | } |
| 339 | |
| 340 | static int fuse_main_common(int argc, char *argv[], |
| 341 | const struct fuse_operations *op, size_t op_size, |
| 342 | void *user_data, int compat) |
| 343 | { |
| 344 | struct fuse *fuse; |
| 345 | char *mountpoint; |
| 346 | int multithreaded; |
| 347 | int res; |
| 348 | |
| 349 | fuse = fuse_setup_common(argc, argv, op, op_size, &mountpoint, |
| 350 | &multithreaded, NULL, user_data, compat); |
| 351 | if (fuse == NULL) |
| 352 | return 1; |
| 353 | |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 354 | if (multithreaded) |
| 355 | res = fuse_loop_mt(fuse); |
| 356 | else |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 357 | res = fuse_loop(fuse); |
| 358 | |
| 359 | fuse_teardown_common(fuse, mountpoint); |
| 360 | if (res == -1) |
| 361 | return 1; |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | int fuse_main_real(int argc, char *argv[], const struct fuse_operations *op, |
| 367 | size_t op_size, void *user_data) |
| 368 | { |
| 369 | return fuse_main_common(argc, argv, op, op_size, user_data, 0); |
| 370 | } |
| 371 | |
| 372 | #undef fuse_main |
| 373 | int fuse_main(void); |
| 374 | int fuse_main(void) |
| 375 | { |
| 376 | fprintf(stderr, "fuse_main(): This function does not exist\n"); |
| 377 | return -1; |
| 378 | } |
| 379 | |
| 380 | int fuse_version(void) |
| 381 | { |
| 382 | return FUSE_VERSION; |
| 383 | } |
| 384 | |
| 385 | #include "fuse_compat.h" |
| 386 | |
Dees_Troy | e34c133 | 2013-02-06 19:13:00 +0000 | [diff] [blame] | 387 | #if !defined(__FreeBSD__) && !defined(__NetBSD__) |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 388 | |
| 389 | struct fuse *fuse_setup_compat22(int argc, char *argv[], |
| 390 | const struct fuse_operations_compat22 *op, |
| 391 | size_t op_size, char **mountpoint, |
| 392 | int *multithreaded, int *fd) |
| 393 | { |
| 394 | return fuse_setup_common(argc, argv, (struct fuse_operations *) op, |
| 395 | op_size, mountpoint, multithreaded, fd, NULL, |
| 396 | 22); |
| 397 | } |
| 398 | |
| 399 | struct fuse *fuse_setup_compat2(int argc, char *argv[], |
| 400 | const struct fuse_operations_compat2 *op, |
| 401 | char **mountpoint, int *multithreaded, |
| 402 | int *fd) |
| 403 | { |
| 404 | return fuse_setup_common(argc, argv, (struct fuse_operations *) op, |
| 405 | sizeof(struct fuse_operations_compat2), |
| 406 | mountpoint, multithreaded, fd, NULL, 21); |
| 407 | } |
| 408 | |
| 409 | int fuse_main_real_compat22(int argc, char *argv[], |
| 410 | const struct fuse_operations_compat22 *op, |
| 411 | size_t op_size) |
| 412 | { |
| 413 | return fuse_main_common(argc, argv, (struct fuse_operations *) op, |
| 414 | op_size, NULL, 22); |
| 415 | } |
| 416 | |
| 417 | void fuse_main_compat1(int argc, char *argv[], |
| 418 | const struct fuse_operations_compat1 *op) |
| 419 | { |
| 420 | fuse_main_common(argc, argv, (struct fuse_operations *) op, |
| 421 | sizeof(struct fuse_operations_compat1), NULL, 11); |
| 422 | } |
| 423 | |
| 424 | int fuse_main_compat2(int argc, char *argv[], |
| 425 | const struct fuse_operations_compat2 *op) |
| 426 | { |
| 427 | return fuse_main_common(argc, argv, (struct fuse_operations *) op, |
| 428 | sizeof(struct fuse_operations_compat2), NULL, |
| 429 | 21); |
| 430 | } |
| 431 | |
| 432 | int fuse_mount_compat1(const char *mountpoint, const char *args[]) |
| 433 | { |
| 434 | /* just ignore mount args for now */ |
| 435 | (void) args; |
| 436 | return fuse_mount_compat22(mountpoint, NULL); |
| 437 | } |
| 438 | |
Matt Mower | 523a059 | 2015-12-13 11:31:00 -0600 | [diff] [blame^] | 439 | FUSE_SYMVER(".symver fuse_setup_compat2,__fuse_setup@FUSE_UNVERSIONED"); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 440 | FUSE_SYMVER(".symver fuse_setup_compat22,fuse_setup@FUSE_2.2"); |
Matt Mower | 523a059 | 2015-12-13 11:31:00 -0600 | [diff] [blame^] | 441 | FUSE_SYMVER(".symver fuse_teardown,__fuse_teardown@FUSE_UNVERSIONED"); |
| 442 | FUSE_SYMVER(".symver fuse_main_compat2,fuse_main@FUSE_UNVERSIONED"); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 443 | FUSE_SYMVER(".symver fuse_main_real_compat22,fuse_main_real@FUSE_2.2"); |
| 444 | |
Dees_Troy | e34c133 | 2013-02-06 19:13:00 +0000 | [diff] [blame] | 445 | #endif /* __FreeBSD__ || __NetBSD__ */ |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 446 | |
| 447 | |
| 448 | struct fuse *fuse_setup_compat25(int argc, char *argv[], |
| 449 | const struct fuse_operations_compat25 *op, |
| 450 | size_t op_size, char **mountpoint, |
| 451 | int *multithreaded, int *fd) |
| 452 | { |
| 453 | return fuse_setup_common(argc, argv, (struct fuse_operations *) op, |
| 454 | op_size, mountpoint, multithreaded, fd, NULL, |
| 455 | 25); |
| 456 | } |
| 457 | |
| 458 | int fuse_main_real_compat25(int argc, char *argv[], |
| 459 | const struct fuse_operations_compat25 *op, |
| 460 | size_t op_size) |
| 461 | { |
| 462 | return fuse_main_common(argc, argv, (struct fuse_operations *) op, |
| 463 | op_size, NULL, 25); |
| 464 | } |
| 465 | |
| 466 | void fuse_teardown_compat22(struct fuse *fuse, int fd, char *mountpoint) |
| 467 | { |
| 468 | (void) fd; |
| 469 | fuse_teardown_common(fuse, mountpoint); |
| 470 | } |
| 471 | |
| 472 | int fuse_mount_compat25(const char *mountpoint, struct fuse_args *args) |
| 473 | { |
| 474 | return fuse_kern_mount(mountpoint, args); |
| 475 | } |
| 476 | |
| 477 | FUSE_SYMVER(".symver fuse_setup_compat25,fuse_setup@FUSE_2.5"); |
| 478 | FUSE_SYMVER(".symver fuse_teardown_compat22,fuse_teardown@FUSE_2.2"); |
| 479 | FUSE_SYMVER(".symver fuse_main_real_compat25,fuse_main_real@FUSE_2.5"); |
| 480 | FUSE_SYMVER(".symver fuse_mount_compat25,fuse_mount@FUSE_2.5"); |