blob: 4e4e154bd966b542e5b05dd50ff73c4c7d393817
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Mini mount implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| 7 | * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> |
| 8 | * |
| 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 10 | */ |
| 11 | // Design notes: There is no spec for mount. Remind me to write one. |
| 12 | // |
| 13 | // mount_main() calls singlemount() which calls mount_it_now(). |
| 14 | // |
| 15 | // mount_main() can loop through /etc/fstab for mount -a |
| 16 | // singlemount() can loop through /etc/filesystems for fstype detection. |
| 17 | // mount_it_now() does the actual mount. |
| 18 | // |
| 19 | |
| 20 | //config:config MOUNT |
| 21 | //config: bool "mount" |
| 22 | //config: default y |
| 23 | //config: select PLATFORM_LINUX |
| 24 | //config: help |
| 25 | //config: All files and filesystems in Unix are arranged into one big directory |
| 26 | //config: tree. The 'mount' utility is used to graft a filesystem onto a |
| 27 | //config: particular part of the tree. A filesystem can either live on a block |
| 28 | //config: device, or it can be accessible over the network, as is the case with |
| 29 | //config: NFS filesystems. Most people using BusyBox will also want to enable |
| 30 | //config: the 'mount' utility. |
| 31 | //config: |
| 32 | //config:config FEATURE_MOUNT_FAKE |
| 33 | //config: bool "Support option -f" |
| 34 | //config: default y |
| 35 | //config: depends on MOUNT |
| 36 | //config: help |
| 37 | //config: Enable support for faking a file system mount. |
| 38 | //config: |
| 39 | //config:config FEATURE_MOUNT_VERBOSE |
| 40 | //config: bool "Support option -v" |
| 41 | //config: default y |
| 42 | //config: depends on MOUNT |
| 43 | //config: help |
| 44 | //config: Enable multi-level -v[vv...] verbose messages. Useful if you |
| 45 | //config: debug mount problems and want to see what is exactly passed |
| 46 | //config: to the kernel. |
| 47 | //config: |
| 48 | //config:config FEATURE_MOUNT_HELPERS |
| 49 | //config: bool "Support mount helpers" |
| 50 | //config: default n |
| 51 | //config: depends on MOUNT |
| 52 | //config: help |
| 53 | //config: Enable mounting of virtual file systems via external helpers. |
| 54 | //config: E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call |
| 55 | //config: "obexfs -b00.11.22.33.44.55 /mnt" |
| 56 | //config: Also "mount -t sometype [-o opts] fs /mnt" will try |
| 57 | //config: "sometype [-o opts] fs /mnt" if simple mount syscall fails. |
| 58 | //config: The idea is to use such virtual filesystems in /etc/fstab. |
| 59 | //config: |
| 60 | //config:config FEATURE_MOUNT_LABEL |
| 61 | //config: bool "Support specifying devices by label or UUID" |
| 62 | //config: default y |
| 63 | //config: depends on MOUNT |
| 64 | //config: select VOLUMEID |
| 65 | //config: help |
| 66 | //config: This allows for specifying a device by label or uuid, rather than by |
| 67 | //config: name. This feature utilizes the same functionality as blkid/findfs. |
| 68 | //config: This also enables label or uuid support for swapon. |
| 69 | //config: |
| 70 | //config:config FEATURE_MOUNT_NFS |
| 71 | //config: bool "Support mounting NFS file systems on Linux < 2.6.23" |
| 72 | //config: default n |
| 73 | //config: depends on MOUNT |
| 74 | //config: select FEATURE_HAVE_RPC |
| 75 | //config: select FEATURE_SYSLOG |
| 76 | //config: help |
| 77 | //config: Enable mounting of NFS file systems on Linux kernels prior |
| 78 | //config: to version 2.6.23. Note that in this case mounting of NFS |
| 79 | //config: over IPv6 will not be possible. |
| 80 | //config: |
| 81 | //config: Note that this option links in RPC support from libc, |
| 82 | //config: which is rather large (~10 kbytes on uclibc). |
| 83 | //config: |
| 84 | //config:config FEATURE_MOUNT_CIFS |
| 85 | //config: bool "Support mounting CIFS/SMB file systems" |
| 86 | //config: default y |
| 87 | //config: depends on MOUNT |
| 88 | //config: help |
| 89 | //config: Enable support for samba mounts. |
| 90 | //config: |
| 91 | //config:config FEATURE_MOUNT_FLAGS |
| 92 | //config: depends on MOUNT |
| 93 | //config: bool "Support lots of -o flags in mount" |
| 94 | //config: default y |
| 95 | //config: help |
| 96 | //config: Without this, mount only supports ro/rw/remount. With this, it |
| 97 | //config: supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime, |
| 98 | //config: noatime, diratime, nodiratime, loud, bind, move, shared, slave, |
| 99 | //config: private, unbindable, rshared, rslave, rprivate, and runbindable. |
| 100 | //config: |
| 101 | //config:config FEATURE_MOUNT_FSTAB |
| 102 | //config: depends on MOUNT |
| 103 | //config: bool "Support /etc/fstab and -a" |
| 104 | //config: default y |
| 105 | //config: help |
| 106 | //config: Support mount all and looking for files in /etc/fstab. |
| 107 | //config: |
| 108 | //config:config FEATURE_MOUNT_OTHERTAB |
| 109 | //config: depends on FEATURE_MOUNT_FSTAB |
| 110 | //config: bool "Support -T <alt_fstab>" |
| 111 | //config: default y |
| 112 | //config: help |
| 113 | //config: Support mount -T (specifying an alternate fstab) |
| 114 | |
| 115 | /* On full-blown systems, requires suid for user mounts. |
| 116 | * But it's not unthinkable to have it available in non-suid flavor on some systems, |
| 117 | * for viewing mount table. |
| 118 | * Therefore we use BB_SUID_MAYBE instead of BB_SUID_REQUIRE: */ |
| 119 | //applet:IF_MOUNT(APPLET(mount, BB_DIR_BIN, IF_DESKTOP(BB_SUID_MAYBE) IF_NOT_DESKTOP(BB_SUID_DROP))) |
| 120 | |
| 121 | //kbuild:lib-$(CONFIG_MOUNT) += mount.o |
| 122 | |
| 123 | //usage:#define mount_trivial_usage |
| 124 | //usage: "[OPTIONS] [-o OPT] DEVICE NODE" |
| 125 | //usage:#define mount_full_usage "\n\n" |
| 126 | //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n" |
| 127 | //usage: "\n -a Mount all filesystems in fstab" |
| 128 | //usage: IF_FEATURE_MOUNT_FAKE( |
| 129 | //usage: IF_FEATURE_MTAB_SUPPORT( |
| 130 | //usage: "\n -f Update /etc/mtab, but don't mount" |
| 131 | //usage: ) |
| 132 | //usage: IF_NOT_FEATURE_MTAB_SUPPORT( |
| 133 | //usage: "\n -f Dry run" |
| 134 | //usage: ) |
| 135 | //usage: ) |
| 136 | //usage: IF_FEATURE_MOUNT_HELPERS( |
| 137 | //usage: "\n -i Don't run mount helper" |
| 138 | //usage: ) |
| 139 | //usage: IF_FEATURE_MTAB_SUPPORT( |
| 140 | //usage: "\n -n Don't update /etc/mtab" |
| 141 | //usage: ) |
| 142 | //usage: IF_FEATURE_MOUNT_VERBOSE( |
| 143 | //usage: "\n -v Verbose" |
| 144 | //usage: ) |
| 145 | ////usage: "\n -s Sloppy (ignored)" |
| 146 | //usage: "\n -r Read-only mount" |
| 147 | ////usage: "\n -w Read-write mount (default)" |
| 148 | //usage: "\n -t FSTYPE[,...] Filesystem type(s)" |
| 149 | //usage: IF_FEATURE_MOUNT_OTHERTAB( |
| 150 | //usage: "\n -T FILE Read FILE instead of /etc/fstab" |
| 151 | //usage: ) |
| 152 | //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)" |
| 153 | //usage: "\n-o OPT:" |
| 154 | //usage: IF_FEATURE_MOUNT_LOOP( |
| 155 | //usage: "\n loop Ignored (loop devices are autodetected)" |
| 156 | //usage: ) |
| 157 | //usage: IF_FEATURE_MOUNT_FLAGS( |
| 158 | //usage: "\n [a]sync Writes are [a]synchronous" |
| 159 | //usage: "\n [no]atime Disable/enable updates to inode access times" |
| 160 | //usage: "\n [no]diratime Disable/enable atime updates to directories" |
| 161 | //usage: "\n [no]relatime Disable/enable atime updates relative to modification time" |
| 162 | //usage: "\n [no]dev (Dis)allow use of special device files" |
| 163 | //usage: "\n [no]exec (Dis)allow use of executable files" |
| 164 | //usage: "\n [no]suid (Dis)allow set-user-id-root programs" |
| 165 | //usage: "\n [r]shared Convert [recursively] to a shared subtree" |
| 166 | //usage: "\n [r]slave Convert [recursively] to a slave subtree" |
| 167 | //usage: "\n [r]private Convert [recursively] to a private subtree" |
| 168 | //usage: "\n [un]bindable Make mount point [un]able to be bind mounted" |
| 169 | //usage: "\n [r]bind Bind a file or directory [recursively] to another location" |
| 170 | //usage: "\n move Relocate an existing mount point" |
| 171 | //usage: ) |
| 172 | //usage: "\n remount Remount a mounted filesystem, changing flags" |
| 173 | //usage: "\n ro Same as -r" |
| 174 | //usage: "\n" |
| 175 | //usage: "\nThere are filesystem-specific -o flags." |
| 176 | //usage: |
| 177 | //usage:#define mount_example_usage |
| 178 | //usage: "$ mount\n" |
| 179 | //usage: "/dev/hda3 on / type minix (rw)\n" |
| 180 | //usage: "proc on /proc type proc (rw)\n" |
| 181 | //usage: "devpts on /dev/pts type devpts (rw)\n" |
| 182 | //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n" |
| 183 | //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n" |
| 184 | //usage: "$ mount cd_image.iso mydir\n" |
| 185 | //usage:#define mount_notes_usage |
| 186 | //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount." |
| 187 | |
| 188 | #include <mntent.h> |
| 189 | #include <syslog.h> |
| 190 | #include <sys/mount.h> |
| 191 | #include <android.h> |
| 192 | |
| 193 | // Grab more as needed from util-linux's mount/mount_constants.h |
| 194 | #ifndef MS_DIRSYNC |
| 195 | # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous |
| 196 | #endif |
| 197 | #ifndef MS_UNION |
| 198 | # define MS_UNION (1 << 8) |
| 199 | #endif |
| 200 | #ifndef MS_BIND |
| 201 | # define MS_BIND (1 << 12) |
| 202 | #endif |
| 203 | #ifndef MS_MOVE |
| 204 | # define MS_MOVE (1 << 13) |
| 205 | #endif |
| 206 | #ifndef MS_RECURSIVE |
| 207 | # define MS_RECURSIVE (1 << 14) |
| 208 | #endif |
| 209 | #ifndef MS_SILENT |
| 210 | # define MS_SILENT (1 << 15) |
| 211 | #endif |
| 212 | // The shared subtree stuff, which went in around 2.6.15 |
| 213 | #ifndef MS_UNBINDABLE |
| 214 | # define MS_UNBINDABLE (1 << 17) |
| 215 | #endif |
| 216 | #ifndef MS_PRIVATE |
| 217 | # define MS_PRIVATE (1 << 18) |
| 218 | #endif |
| 219 | #ifndef MS_SLAVE |
| 220 | # define MS_SLAVE (1 << 19) |
| 221 | #endif |
| 222 | #ifndef MS_SHARED |
| 223 | # define MS_SHARED (1 << 20) |
| 224 | #endif |
| 225 | #ifndef MS_RELATIME |
| 226 | # define MS_RELATIME (1 << 21) |
| 227 | #endif |
| 228 | #ifndef MS_STRICTATIME |
| 229 | # define MS_STRICTATIME (1 << 24) |
| 230 | #endif |
| 231 | |
| 232 | /* Any ~MS_FOO value has this bit set: */ |
| 233 | #define BB_MS_INVERTED_VALUE (1u << 31) |
| 234 | |
| 235 | #include "libbb.h" |
| 236 | #include "common_bufsiz.h" |
| 237 | #if ENABLE_FEATURE_MOUNT_LABEL |
| 238 | # include "volume_id.h" |
| 239 | #else |
| 240 | # define resolve_mount_spec(fsname) ((void)0) |
| 241 | #endif |
| 242 | |
| 243 | // Needed for nfs support only |
| 244 | #include <sys/utsname.h> |
| 245 | #undef TRUE |
| 246 | #undef FALSE |
| 247 | #if ENABLE_FEATURE_MOUNT_NFS |
| 248 | /* This is just a warning of a common mistake. Possibly this should be a |
| 249 | * uclibc faq entry rather than in busybox... */ |
| 250 | # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
| 251 | # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support" |
| 252 | # endif |
| 253 | # include <rpc/rpc.h> |
| 254 | # include <rpc/pmap_prot.h> |
| 255 | # include <rpc/pmap_clnt.h> |
| 256 | #endif |
| 257 | |
| 258 | |
| 259 | #if defined(__dietlibc__) |
| 260 | // 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
| 261 | // dietlibc-0.30 does not have implementation of getmntent_r() |
| 262 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
| 263 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) |
| 264 | { |
| 265 | struct mntent* ment = getmntent(stream); |
| 266 | return memcpy(result, ment, sizeof(*ment)); |
| 267 | } |
| 268 | #endif |
| 269 | |
| 270 | |
| 271 | // Not real flags, but we want to be able to check for this. |
| 272 | enum { |
| 273 | MOUNT_USERS = (1 << 27) * ENABLE_DESKTOP, |
| 274 | MOUNT_NOFAIL = (1 << 28) * ENABLE_DESKTOP, |
| 275 | MOUNT_NOAUTO = (1 << 29), |
| 276 | MOUNT_SWAP = (1 << 30), |
| 277 | MOUNT_FAKEFLAGS = MOUNT_USERS | MOUNT_NOFAIL | MOUNT_NOAUTO | MOUNT_SWAP |
| 278 | }; |
| 279 | |
| 280 | |
| 281 | #define OPTION_STR "o:*t:rwanfvsiO:" IF_FEATURE_MOUNT_OTHERTAB("T:") |
| 282 | enum { |
| 283 | OPT_o = (1 << 0), |
| 284 | OPT_t = (1 << 1), |
| 285 | OPT_r = (1 << 2), |
| 286 | OPT_w = (1 << 3), |
| 287 | OPT_a = (1 << 4), |
| 288 | OPT_n = (1 << 5), |
| 289 | OPT_f = (1 << 6), |
| 290 | OPT_v = (1 << 7), |
| 291 | OPT_s = (1 << 8), |
| 292 | OPT_i = (1 << 9), |
| 293 | OPT_O = (1 << 10), |
| 294 | OPT_T = (1 << 11), |
| 295 | }; |
| 296 | |
| 297 | #if ENABLE_FEATURE_MTAB_SUPPORT |
| 298 | #define USE_MTAB (!(option_mask32 & OPT_n)) |
| 299 | #else |
| 300 | #define USE_MTAB 0 |
| 301 | #endif |
| 302 | |
| 303 | #if ENABLE_FEATURE_MOUNT_FAKE |
| 304 | #define FAKE_IT (option_mask32 & OPT_f) |
| 305 | #else |
| 306 | #define FAKE_IT 0 |
| 307 | #endif |
| 308 | |
| 309 | #if ENABLE_FEATURE_MOUNT_HELPERS |
| 310 | #define HELPERS_ALLOWED (!(option_mask32 & OPT_i)) |
| 311 | #else |
| 312 | #define HELPERS_ALLOWED 0 |
| 313 | #endif |
| 314 | |
| 315 | |
| 316 | // TODO: more "user" flag compatibility. |
| 317 | // "user" option (from mount manpage): |
| 318 | // Only the user that mounted a filesystem can unmount it again. |
| 319 | // If any user should be able to unmount, then use users instead of user |
| 320 | // in the fstab line. The owner option is similar to the user option, |
| 321 | // with the restriction that the user must be the owner of the special file. |
| 322 | // This may be useful e.g. for /dev/fd if a login script makes |
| 323 | // the console user owner of this device. |
| 324 | |
| 325 | // Standard mount options (from -o options or --options), |
| 326 | // with corresponding flags |
| 327 | static const int32_t mount_options[] = { |
| 328 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
| 329 | |
| 330 | IF_FEATURE_MOUNT_LOOP( |
| 331 | /* "loop" */ 0, |
| 332 | ) |
| 333 | |
| 334 | IF_FEATURE_MOUNT_FSTAB( |
| 335 | /* "defaults" */ 0, |
| 336 | /* "quiet" 0 - do not filter out, vfat wants to see it */ |
| 337 | /* "noauto" */ MOUNT_NOAUTO, |
| 338 | /* "sw" */ MOUNT_SWAP, |
| 339 | /* "swap" */ MOUNT_SWAP, |
| 340 | IF_DESKTOP(/* "user" */ MOUNT_USERS,) |
| 341 | IF_DESKTOP(/* "users" */ MOUNT_USERS,) |
| 342 | IF_DESKTOP(/* "nofail" */ MOUNT_NOFAIL,) |
| 343 | /* "_netdev" */ 0, |
| 344 | IF_DESKTOP(/* "comment=" */ 0,) /* systemd uses this in fstab */ |
| 345 | ) |
| 346 | |
| 347 | IF_FEATURE_MOUNT_FLAGS( |
| 348 | // vfs flags |
| 349 | /* "nosuid" */ MS_NOSUID, |
| 350 | /* "suid" */ ~MS_NOSUID, |
| 351 | /* "dev" */ ~MS_NODEV, |
| 352 | /* "nodev" */ MS_NODEV, |
| 353 | /* "exec" */ ~MS_NOEXEC, |
| 354 | /* "noexec" */ MS_NOEXEC, |
| 355 | /* "sync" */ MS_SYNCHRONOUS, |
| 356 | /* "dirsync" */ MS_DIRSYNC, |
| 357 | /* "async" */ ~MS_SYNCHRONOUS, |
| 358 | /* "atime" */ ~MS_NOATIME, |
| 359 | /* "noatime" */ MS_NOATIME, |
| 360 | /* "diratime" */ ~MS_NODIRATIME, |
| 361 | /* "nodiratime" */ MS_NODIRATIME, |
| 362 | /* "mand" */ MS_MANDLOCK, |
| 363 | /* "nomand" */ ~MS_MANDLOCK, |
| 364 | /* "relatime" */ MS_RELATIME, |
| 365 | /* "norelatime" */ ~MS_RELATIME, |
| 366 | /* "strictatime" */ MS_STRICTATIME, |
| 367 | /* "loud" */ ~MS_SILENT, |
| 368 | /* "rbind" */ MS_BIND|MS_RECURSIVE, |
| 369 | |
| 370 | // action flags |
| 371 | /* "union" */ MS_UNION, |
| 372 | /* "bind" */ MS_BIND, |
| 373 | /* "move" */ MS_MOVE, |
| 374 | /* "shared" */ MS_SHARED, |
| 375 | /* "slave" */ MS_SLAVE, |
| 376 | /* "private" */ MS_PRIVATE, |
| 377 | /* "unbindable" */ MS_UNBINDABLE, |
| 378 | /* "rshared" */ MS_SHARED|MS_RECURSIVE, |
| 379 | /* "rslave" */ MS_SLAVE|MS_RECURSIVE, |
| 380 | /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE, |
| 381 | /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE, |
| 382 | ) |
| 383 | |
| 384 | // Always understood. |
| 385 | /* "ro" */ MS_RDONLY, // vfs flag |
| 386 | /* "rw" */ ~MS_RDONLY, // vfs flag |
| 387 | /* "remount" */ MS_REMOUNT // action flag |
| 388 | }; |
| 389 | |
| 390 | static const char mount_option_str[] ALIGN1 = |
| 391 | IF_FEATURE_MOUNT_LOOP( |
| 392 | "loop\0" |
| 393 | ) |
| 394 | IF_FEATURE_MOUNT_FSTAB( |
| 395 | "defaults\0" |
| 396 | // "quiet\0" - do not filter out, vfat wants to see it |
| 397 | "noauto\0" |
| 398 | "sw\0" |
| 399 | "swap\0" |
| 400 | IF_DESKTOP("user\0") |
| 401 | IF_DESKTOP("users\0") |
| 402 | IF_DESKTOP("nofail\0") |
| 403 | "_netdev\0" |
| 404 | IF_DESKTOP("comment=\0") /* systemd uses this in fstab */ |
| 405 | ) |
| 406 | IF_FEATURE_MOUNT_FLAGS( |
| 407 | // vfs flags |
| 408 | "nosuid\0" |
| 409 | "suid\0" |
| 410 | "dev\0" |
| 411 | "nodev\0" |
| 412 | "exec\0" |
| 413 | "noexec\0" |
| 414 | "sync\0" |
| 415 | "dirsync\0" |
| 416 | "async\0" |
| 417 | "atime\0" |
| 418 | "noatime\0" |
| 419 | "diratime\0" |
| 420 | "nodiratime\0" |
| 421 | "mand\0" |
| 422 | "nomand\0" |
| 423 | "relatime\0" |
| 424 | "norelatime\0" |
| 425 | "strictatime\0" |
| 426 | "loud\0" |
| 427 | "rbind\0" |
| 428 | |
| 429 | // action flags |
| 430 | "union\0" |
| 431 | "bind\0" |
| 432 | "move\0" |
| 433 | "make-shared\0" |
| 434 | "make-slave\0" |
| 435 | "make-private\0" |
| 436 | "make-unbindable\0" |
| 437 | "make-rshared\0" |
| 438 | "make-rslave\0" |
| 439 | "make-rprivate\0" |
| 440 | "make-runbindable\0" |
| 441 | ) |
| 442 | |
| 443 | // Always understood. |
| 444 | "ro\0" // vfs flag |
| 445 | "rw\0" // vfs flag |
| 446 | "remount\0" // action flag |
| 447 | ; |
| 448 | |
| 449 | |
| 450 | struct globals { |
| 451 | #if ENABLE_FEATURE_MOUNT_NFS |
| 452 | smalluint nfs_mount_version; |
| 453 | #endif |
| 454 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
| 455 | unsigned verbose; |
| 456 | #endif |
| 457 | llist_t *fslist; |
| 458 | char getmntent_buf[1]; |
| 459 | } FIX_ALIASING; |
| 460 | enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) }; |
| 461 | #define G (*(struct globals*)bb_common_bufsiz1) |
| 462 | #define nfs_mount_version (G.nfs_mount_version) |
| 463 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
| 464 | #define verbose (G.verbose ) |
| 465 | #else |
| 466 | #define verbose 0 |
| 467 | #endif |
| 468 | #define fslist (G.fslist ) |
| 469 | #define getmntent_buf (G.getmntent_buf ) |
| 470 | #define INIT_G() do { setup_common_bufsiz(); } while (0) |
| 471 | |
| 472 | #if ENABLE_FEATURE_MTAB_SUPPORT |
| 473 | /* |
| 474 | * update_mtab_entry_on_move() is used to update entry in case of mount --move. |
| 475 | * we are looking for existing entries mnt_dir which is equal to mnt_fsname of |
| 476 | * input mntent and replace it by new one. |
| 477 | */ |
| 478 | static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp) |
| 479 | { |
| 480 | struct mntent *entries, *m; |
| 481 | int i, count; |
| 482 | FILE *mountTable; |
| 483 | |
| 484 | mountTable = setmntent(bb_path_mtab_file, "r"); |
| 485 | if (!mountTable) { |
| 486 | bb_perror_msg(bb_path_mtab_file); |
| 487 | return; |
| 488 | } |
| 489 | |
| 490 | entries = NULL; |
| 491 | count = 0; |
| 492 | while ((m = getmntent(mountTable)) != NULL) { |
| 493 | entries = xrealloc_vector(entries, 3, count); |
| 494 | entries[count].mnt_fsname = xstrdup(m->mnt_fsname); |
| 495 | entries[count].mnt_dir = xstrdup(m->mnt_dir); |
| 496 | entries[count].mnt_type = xstrdup(m->mnt_type); |
| 497 | entries[count].mnt_opts = xstrdup(m->mnt_opts); |
| 498 | entries[count].mnt_freq = m->mnt_freq; |
| 499 | entries[count].mnt_passno = m->mnt_passno; |
| 500 | count++; |
| 501 | } |
| 502 | endmntent(mountTable); |
| 503 | |
| 504 | mountTable = setmntent(bb_path_mtab_file, "w"); |
| 505 | if (mountTable) { |
| 506 | for (i = 0; i < count; i++) { |
| 507 | if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0) |
| 508 | addmntent(mountTable, &entries[i]); |
| 509 | else |
| 510 | addmntent(mountTable, mp); |
| 511 | } |
| 512 | endmntent(mountTable); |
| 513 | } else if (errno != EROFS) |
| 514 | bb_perror_msg(bb_path_mtab_file); |
| 515 | |
| 516 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 517 | for (i = 0; i < count; i++) { |
| 518 | free(entries[i].mnt_fsname); |
| 519 | free(entries[i].mnt_dir); |
| 520 | free(entries[i].mnt_type); |
| 521 | free(entries[i].mnt_opts); |
| 522 | } |
| 523 | free(entries); |
| 524 | } |
| 525 | } |
| 526 | #endif |
| 527 | |
| 528 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
| 529 | static int verbose_mount(const char *source, const char *target, |
| 530 | const char *filesystemtype, |
| 531 | unsigned long mountflags, const void *data) |
| 532 | { |
| 533 | int rc; |
| 534 | |
| 535 | errno = 0; |
| 536 | rc = mount(source, target, filesystemtype, mountflags, data); |
| 537 | if (verbose >= 2) |
| 538 | bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d", |
| 539 | source, target, filesystemtype, |
| 540 | mountflags, (char*)data, rc); |
| 541 | return rc; |
| 542 | } |
| 543 | #else |
| 544 | #define verbose_mount(...) mount(__VA_ARGS__) |
| 545 | #endif |
| 546 | |
| 547 | // Append mount options to string |
| 548 | static void append_mount_options(char **oldopts, const char *newopts) |
| 549 | { |
| 550 | if (*oldopts && **oldopts) { |
| 551 | // Do not insert options which are already there |
| 552 | while (newopts[0]) { |
| 553 | char *p; |
| 554 | int len = strlen(newopts); |
| 555 | p = strchr(newopts, ','); |
| 556 | if (p) len = p - newopts; |
| 557 | p = *oldopts; |
| 558 | while (1) { |
| 559 | if (!strncmp(p, newopts, len) |
| 560 | && (p[len] == ',' || p[len] == '\0')) |
| 561 | goto skip; |
| 562 | p = strchr(p,','); |
| 563 | if (!p) break; |
| 564 | p++; |
| 565 | } |
| 566 | p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
| 567 | free(*oldopts); |
| 568 | *oldopts = p; |
| 569 | skip: |
| 570 | newopts += len; |
| 571 | while (newopts[0] == ',') newopts++; |
| 572 | } |
| 573 | } else { |
| 574 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
| 575 | *oldopts = xstrdup(newopts); |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | // Use the mount_options list to parse options into flags. |
| 580 | // Also update list of unrecognized options if unrecognized != NULL |
| 581 | static unsigned long parse_mount_options(char *options, char **unrecognized) |
| 582 | { |
| 583 | unsigned long flags = MS_SILENT; |
| 584 | |
| 585 | // Loop through options |
| 586 | for (;;) { |
| 587 | unsigned i; |
| 588 | char *comma = strchr(options, ','); |
| 589 | const char *option_str = mount_option_str; |
| 590 | |
| 591 | if (comma) *comma = '\0'; |
| 592 | |
| 593 | // FIXME: use hasmntopt() |
| 594 | // Find this option in mount_options |
| 595 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
| 596 | unsigned opt_len = strlen(option_str); |
| 597 | |
| 598 | if (strncasecmp(option_str, options, opt_len) == 0 |
| 599 | && (options[opt_len] == '\0' |
| 600 | /* or is it "comment=" thingy in fstab? */ |
| 601 | IF_FEATURE_MOUNT_FSTAB(IF_DESKTOP( || option_str[opt_len-1] == '=' )) |
| 602 | ) |
| 603 | ) { |
| 604 | unsigned long fl = mount_options[i]; |
| 605 | if (fl & BB_MS_INVERTED_VALUE) |
| 606 | flags &= fl; |
| 607 | else |
| 608 | flags |= fl; |
| 609 | goto found; |
| 610 | } |
| 611 | option_str += opt_len + 1; |
| 612 | } |
| 613 | // We did not recognize this option. |
| 614 | // If "unrecognized" is not NULL, append option there. |
| 615 | // Note that we should not append *empty* option - |
| 616 | // in this case we want to pass NULL, not "", to "data" |
| 617 | // parameter of mount(2) syscall. |
| 618 | // This is crucial for filesystems that don't accept |
| 619 | // any arbitrary mount options, like cgroup fs: |
| 620 | // "mount -t cgroup none /mnt" |
| 621 | if (options[0] && unrecognized) { |
| 622 | // Add it to strflags, to pass on to kernel |
| 623 | char *p = *unrecognized; |
| 624 | unsigned len = p ? strlen(p) : 0; |
| 625 | *unrecognized = p = xrealloc(p, len + strlen(options) + 2); |
| 626 | |
| 627 | // Comma separated if it's not the first one |
| 628 | if (len) p[len++] = ','; |
| 629 | strcpy(p + len, options); |
| 630 | } |
| 631 | found: |
| 632 | if (!comma) |
| 633 | break; |
| 634 | // Advance to next option |
| 635 | *comma = ','; |
| 636 | options = ++comma; |
| 637 | } |
| 638 | |
| 639 | return flags; |
| 640 | } |
| 641 | |
| 642 | // Return a list of all block device backed filesystems |
| 643 | static llist_t *get_block_backed_filesystems(void) |
| 644 | { |
| 645 | static const char filesystems[2][sizeof("/proc/filesystems")] = { |
| 646 | "/etc/filesystems", |
| 647 | "/proc/filesystems", |
| 648 | }; |
| 649 | char *fs, *buf; |
| 650 | llist_t *list = NULL; |
| 651 | int i; |
| 652 | FILE *f; |
| 653 | |
| 654 | for (i = 0; i < 2; i++) { |
| 655 | f = fopen_for_read(filesystems[i]); |
| 656 | if (!f) continue; |
| 657 | |
| 658 | while ((buf = xmalloc_fgetline(f)) != NULL) { |
| 659 | if (is_prefixed_with(buf, "nodev") && isspace(buf[5])) |
| 660 | goto next; |
| 661 | fs = skip_whitespace(buf); |
| 662 | if (*fs == '#' || *fs == '*' || !*fs) |
| 663 | goto next; |
| 664 | |
| 665 | llist_add_to_end(&list, xstrdup(fs)); |
| 666 | next: |
| 667 | free(buf); |
| 668 | } |
| 669 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
| 670 | } |
| 671 | |
| 672 | return list; |
| 673 | } |
| 674 | |
| 675 | #if ENABLE_FEATURE_CLEAN_UP |
| 676 | static void delete_block_backed_filesystems(void) |
| 677 | { |
| 678 | llist_free(fslist, free); |
| 679 | } |
| 680 | #else |
| 681 | void delete_block_backed_filesystems(void); |
| 682 | #endif |
| 683 | |
| 684 | // Perform actual mount of specific filesystem at specific location. |
| 685 | // NB: mp->xxx fields may be trashed on exit |
| 686 | static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| 687 | { |
| 688 | int rc = 0; |
| 689 | |
| 690 | vfsflags &= ~(unsigned long)MOUNT_FAKEFLAGS; |
| 691 | |
| 692 | if (FAKE_IT) { |
| 693 | if (verbose >= 2) |
| 694 | bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')", |
| 695 | mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| 696 | vfsflags, filteropts); |
| 697 | goto mtab; |
| 698 | } |
| 699 | |
| 700 | // Mount, with fallback to read-only if necessary. |
| 701 | for (;;) { |
| 702 | errno = 0; |
| 703 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| 704 | vfsflags, filteropts); |
| 705 | |
| 706 | // If mount failed, try |
| 707 | // helper program mount.<mnt_type> |
| 708 | if (HELPERS_ALLOWED && rc && mp->mnt_type) { |
| 709 | char *args[8]; |
| 710 | int errno_save = errno; |
| 711 | args[0] = xasprintf("mount.%s", mp->mnt_type); |
| 712 | rc = 1; |
| 713 | if (FAKE_IT) |
| 714 | args[rc++] = (char *)"-f"; |
| 715 | if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB) |
| 716 | args[rc++] = (char *)"-n"; |
| 717 | args[rc++] = mp->mnt_fsname; |
| 718 | args[rc++] = mp->mnt_dir; |
| 719 | if (filteropts) { |
| 720 | args[rc++] = (char *)"-o"; |
| 721 | args[rc++] = filteropts; |
| 722 | } |
| 723 | args[rc] = NULL; |
| 724 | rc = spawn_and_wait(args); |
| 725 | free(args[0]); |
| 726 | if (!rc) |
| 727 | break; |
| 728 | errno = errno_save; |
| 729 | } |
| 730 | |
| 731 | if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS)) |
| 732 | break; |
| 733 | if (!(vfsflags & MS_SILENT)) |
| 734 | bb_error_msg("%s is write-protected, mounting read-only", |
| 735 | mp->mnt_fsname); |
| 736 | vfsflags |= MS_RDONLY; |
| 737 | } |
| 738 | |
| 739 | // Abort entirely if permission denied. |
| 740 | |
| 741 | if (rc && errno == EPERM) |
| 742 | bb_error_msg_and_die("%s", bb_msg_perm_denied_are_you_root); |
| 743 | |
| 744 | // If the mount was successful, and we're maintaining an old-style |
| 745 | // mtab file by hand, add the new entry to it now. |
| 746 | mtab: |
| 747 | if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) { |
| 748 | char *fsname; |
| 749 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
| 750 | const char *option_str = mount_option_str; |
| 751 | int i; |
| 752 | |
| 753 | if (!mountTable) { |
| 754 | bb_perror_msg(bb_path_mtab_file); |
| 755 | goto ret; |
| 756 | } |
| 757 | |
| 758 | // Add vfs string flags |
| 759 | for (i = 0; mount_options[i] != MS_REMOUNT; i++) { |
| 760 | if (mount_options[i] > 0 && (mount_options[i] & vfsflags)) |
| 761 | append_mount_options(&(mp->mnt_opts), option_str); |
| 762 | option_str += strlen(option_str) + 1; |
| 763 | } |
| 764 | |
| 765 | // Remove trailing / (if any) from directory we mounted on |
| 766 | i = strlen(mp->mnt_dir) - 1; |
| 767 | while (i > 0 && mp->mnt_dir[i] == '/') |
| 768 | mp->mnt_dir[i--] = '\0'; |
| 769 | |
| 770 | // Convert to canonical pathnames as needed |
| 771 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
| 772 | fsname = NULL; |
| 773 | if (!mp->mnt_type || !*mp->mnt_type) { // bind mount |
| 774 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
| 775 | mp->mnt_type = (char*)"bind"; |
| 776 | } |
| 777 | mp->mnt_freq = mp->mnt_passno = 0; |
| 778 | |
| 779 | // Write and close |
| 780 | #if ENABLE_FEATURE_MTAB_SUPPORT |
| 781 | if (vfsflags & MS_MOVE) |
| 782 | update_mtab_entry_on_move(mp); |
| 783 | else |
| 784 | #endif |
| 785 | addmntent(mountTable, mp); |
| 786 | endmntent(mountTable); |
| 787 | |
| 788 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 789 | free(mp->mnt_dir); |
| 790 | free(fsname); |
| 791 | } |
| 792 | } |
| 793 | ret: |
| 794 | return rc; |
| 795 | } |
| 796 | |
| 797 | #if ENABLE_FEATURE_MOUNT_NFS |
| 798 | |
| 799 | /* |
| 800 | * Linux NFS mount |
| 801 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
| 802 | * |
| 803 | * Licensed under GPLv2, see file LICENSE in this source tree. |
| 804 | * |
| 805 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
| 806 | * numbers to be specified on the command line. |
| 807 | * |
| 808 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
| 809 | * Omit the call to connect() for Linux version 1.3.11 or later. |
| 810 | * |
| 811 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
| 812 | * Implemented the "bg", "fg" and "retry" mount options for NFS. |
| 813 | * |
| 814 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
| 815 | * - added Native Language Support |
| 816 | * |
| 817 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
| 818 | * plus NFSv3 stuff. |
| 819 | */ |
| 820 | |
| 821 | #define MOUNTPORT 635 |
| 822 | #define MNTPATHLEN 1024 |
| 823 | #define MNTNAMLEN 255 |
| 824 | #define FHSIZE 32 |
| 825 | #define FHSIZE3 64 |
| 826 | |
| 827 | typedef char fhandle[FHSIZE]; |
| 828 | |
| 829 | typedef struct { |
| 830 | unsigned int fhandle3_len; |
| 831 | char *fhandle3_val; |
| 832 | } fhandle3; |
| 833 | |
| 834 | enum mountstat3 { |
| 835 | MNT_OK = 0, |
| 836 | MNT3ERR_PERM = 1, |
| 837 | MNT3ERR_NOENT = 2, |
| 838 | MNT3ERR_IO = 5, |
| 839 | MNT3ERR_ACCES = 13, |
| 840 | MNT3ERR_NOTDIR = 20, |
| 841 | MNT3ERR_INVAL = 22, |
| 842 | MNT3ERR_NAMETOOLONG = 63, |
| 843 | MNT3ERR_NOTSUPP = 10004, |
| 844 | MNT3ERR_SERVERFAULT = 10006, |
| 845 | }; |
| 846 | typedef enum mountstat3 mountstat3; |
| 847 | |
| 848 | struct fhstatus { |
| 849 | unsigned int fhs_status; |
| 850 | union { |
| 851 | fhandle fhs_fhandle; |
| 852 | } fhstatus_u; |
| 853 | }; |
| 854 | typedef struct fhstatus fhstatus; |
| 855 | |
| 856 | struct mountres3_ok { |
| 857 | fhandle3 fhandle; |
| 858 | struct { |
| 859 | unsigned int auth_flavours_len; |
| 860 | char *auth_flavours_val; |
| 861 | } auth_flavours; |
| 862 | }; |
| 863 | typedef struct mountres3_ok mountres3_ok; |
| 864 | |
| 865 | struct mountres3 { |
| 866 | mountstat3 fhs_status; |
| 867 | union { |
| 868 | mountres3_ok mountinfo; |
| 869 | } mountres3_u; |
| 870 | }; |
| 871 | typedef struct mountres3 mountres3; |
| 872 | |
| 873 | typedef char *dirpath; |
| 874 | |
| 875 | typedef char *name; |
| 876 | |
| 877 | typedef struct mountbody *mountlist; |
| 878 | |
| 879 | struct mountbody { |
| 880 | name ml_hostname; |
| 881 | dirpath ml_directory; |
| 882 | mountlist ml_next; |
| 883 | }; |
| 884 | typedef struct mountbody mountbody; |
| 885 | |
| 886 | typedef struct groupnode *groups; |
| 887 | |
| 888 | struct groupnode { |
| 889 | name gr_name; |
| 890 | groups gr_next; |
| 891 | }; |
| 892 | typedef struct groupnode groupnode; |
| 893 | |
| 894 | typedef struct exportnode *exports; |
| 895 | |
| 896 | struct exportnode { |
| 897 | dirpath ex_dir; |
| 898 | groups ex_groups; |
| 899 | exports ex_next; |
| 900 | }; |
| 901 | typedef struct exportnode exportnode; |
| 902 | |
| 903 | struct ppathcnf { |
| 904 | int pc_link_max; |
| 905 | short pc_max_canon; |
| 906 | short pc_max_input; |
| 907 | short pc_name_max; |
| 908 | short pc_path_max; |
| 909 | short pc_pipe_buf; |
| 910 | uint8_t pc_vdisable; |
| 911 | char pc_xxx; |
| 912 | short pc_mask[2]; |
| 913 | }; |
| 914 | typedef struct ppathcnf ppathcnf; |
| 915 | |
| 916 | #define MOUNTPROG 100005 |
| 917 | #define MOUNTVERS 1 |
| 918 | |
| 919 | #define MOUNTPROC_NULL 0 |
| 920 | #define MOUNTPROC_MNT 1 |
| 921 | #define MOUNTPROC_DUMP 2 |
| 922 | #define MOUNTPROC_UMNT 3 |
| 923 | #define MOUNTPROC_UMNTALL 4 |
| 924 | #define MOUNTPROC_EXPORT 5 |
| 925 | #define MOUNTPROC_EXPORTALL 6 |
| 926 | |
| 927 | #define MOUNTVERS_POSIX 2 |
| 928 | |
| 929 | #define MOUNTPROC_PATHCONF 7 |
| 930 | |
| 931 | #define MOUNT_V3 3 |
| 932 | |
| 933 | #define MOUNTPROC3_NULL 0 |
| 934 | #define MOUNTPROC3_MNT 1 |
| 935 | #define MOUNTPROC3_DUMP 2 |
| 936 | #define MOUNTPROC3_UMNT 3 |
| 937 | #define MOUNTPROC3_UMNTALL 4 |
| 938 | #define MOUNTPROC3_EXPORT 5 |
| 939 | |
| 940 | enum { |
| 941 | #ifndef NFS_FHSIZE |
| 942 | NFS_FHSIZE = 32, |
| 943 | #endif |
| 944 | #ifndef NFS_PORT |
| 945 | NFS_PORT = 2049 |
| 946 | #endif |
| 947 | }; |
| 948 | |
| 949 | /* |
| 950 | * We want to be able to compile mount on old kernels in such a way |
| 951 | * that the binary will work well on more recent kernels. |
| 952 | * Thus, if necessary we teach nfsmount.c the structure of new fields |
| 953 | * that will come later. |
| 954 | * |
| 955 | * Moreover, the new kernel includes conflict with glibc includes |
| 956 | * so it is easiest to ignore the kernel altogether (at compile time). |
| 957 | */ |
| 958 | |
| 959 | struct nfs2_fh { |
| 960 | char data[32]; |
| 961 | }; |
| 962 | struct nfs3_fh { |
| 963 | unsigned short size; |
| 964 | unsigned char data[64]; |
| 965 | }; |
| 966 | |
| 967 | struct nfs_mount_data { |
| 968 | int version; /* 1 */ |
| 969 | int fd; /* 1 */ |
| 970 | struct nfs2_fh old_root; /* 1 */ |
| 971 | int flags; /* 1 */ |
| 972 | int rsize; /* 1 */ |
| 973 | int wsize; /* 1 */ |
| 974 | int timeo; /* 1 */ |
| 975 | int retrans; /* 1 */ |
| 976 | int acregmin; /* 1 */ |
| 977 | int acregmax; /* 1 */ |
| 978 | int acdirmin; /* 1 */ |
| 979 | int acdirmax; /* 1 */ |
| 980 | struct sockaddr_in addr; /* 1 */ |
| 981 | char hostname[256]; /* 1 */ |
| 982 | int namlen; /* 2 */ |
| 983 | unsigned int bsize; /* 3 */ |
| 984 | struct nfs3_fh root; /* 4 */ |
| 985 | }; |
| 986 | |
| 987 | /* bits in the flags field */ |
| 988 | enum { |
| 989 | NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
| 990 | NFS_MOUNT_INTR = 0x0002, /* 1 */ |
| 991 | NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
| 992 | NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
| 993 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
| 994 | NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
| 995 | NFS_MOUNT_TCP = 0x0040, /* 2 */ |
| 996 | NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
| 997 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
| 998 | NFS_MOUNT_NONLM = 0x0200, /* 3 */ |
| 999 | NFS_MOUNT_NOACL = 0x0800, /* 4 */ |
| 1000 | NFS_MOUNT_NORDIRPLUS = 0x4000 |
| 1001 | }; |
| 1002 | |
| 1003 | |
| 1004 | /* |
| 1005 | * We need to translate between nfs status return values and |
| 1006 | * the local errno values which may not be the same. |
| 1007 | * |
| 1008 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
| 1009 | * "after #include <errno.h> the symbol errno is reserved for any use, |
| 1010 | * it cannot even be used as a struct tag or field name". |
| 1011 | */ |
| 1012 | #ifndef EDQUOT |
| 1013 | # define EDQUOT ENOSPC |
| 1014 | #endif |
| 1015 | /* Convert each NFSERR_BLAH into EBLAH */ |
| 1016 | static const uint8_t nfs_err_stat[] ALIGN1 = { |
| 1017 | 1, 2, 5, 6, 13, 17, |
| 1018 | 19, 20, 21, 22, 27, 28, |
| 1019 | 30, 63, 66, 69, 70, 71 |
| 1020 | }; |
| 1021 | #if ( \ |
| 1022 | EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \ |
| 1023 | ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \ |
| 1024 | EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256 |
| 1025 | typedef uint8_t nfs_err_type; |
| 1026 | #else |
| 1027 | typedef uint16_t nfs_err_type; |
| 1028 | #endif |
| 1029 | static const nfs_err_type nfs_err_errnum[] ALIGN2 = { |
| 1030 | EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST, |
| 1031 | ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC, |
| 1032 | EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE |
| 1033 | }; |
| 1034 | static char *nfs_strerror(int status) |
| 1035 | { |
| 1036 | int i; |
| 1037 | |
| 1038 | for (i = 0; i < (int) ARRAY_SIZE(nfs_err_stat); i++) { |
| 1039 | if (nfs_err_stat[i] == status) |
| 1040 | return strerror(nfs_err_errnum[i]); |
| 1041 | } |
| 1042 | return xasprintf("unknown nfs status return value: %d", status); |
| 1043 | } |
| 1044 | |
| 1045 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
| 1046 | { |
| 1047 | return xdr_opaque(xdrs, objp, FHSIZE); |
| 1048 | } |
| 1049 | |
| 1050 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
| 1051 | { |
| 1052 | if (!xdr_u_int(xdrs, &objp->fhs_status)) |
| 1053 | return FALSE; |
| 1054 | if (objp->fhs_status == 0) |
| 1055 | return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle); |
| 1056 | return TRUE; |
| 1057 | } |
| 1058 | |
| 1059 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
| 1060 | { |
| 1061 | return xdr_string(xdrs, objp, MNTPATHLEN); |
| 1062 | } |
| 1063 | |
| 1064 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
| 1065 | { |
| 1066 | return xdr_bytes(xdrs, (char **)&objp->fhandle3_val, |
| 1067 | (unsigned int *) &objp->fhandle3_len, |
| 1068 | FHSIZE3); |
| 1069 | } |
| 1070 | |
| 1071 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
| 1072 | { |
| 1073 | if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
| 1074 | return FALSE; |
| 1075 | return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), |
| 1076 | &(objp->auth_flavours.auth_flavours_len), |
| 1077 | ~0, |
| 1078 | sizeof(int), |
| 1079 | (xdrproc_t) xdr_int); |
| 1080 | } |
| 1081 | |
| 1082 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
| 1083 | { |
| 1084 | return xdr_enum(xdrs, (enum_t *) objp); |
| 1085 | } |
| 1086 | |
| 1087 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
| 1088 | { |
| 1089 | if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
| 1090 | return FALSE; |
| 1091 | if (objp->fhs_status == MNT_OK) |
| 1092 | return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo); |
| 1093 | return TRUE; |
| 1094 | } |
| 1095 | |
| 1096 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
| 1097 | |
| 1098 | /* |
| 1099 | * Unfortunately, the kernel prints annoying console messages |
| 1100 | * in case of an unexpected nfs mount version (instead of |
| 1101 | * just returning some error). Therefore we'll have to try |
| 1102 | * and figure out what version the kernel expects. |
| 1103 | * |
| 1104 | * Variables: |
| 1105 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
| 1106 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
| 1107 | * nfs_mount_version: version this source and running kernel can handle |
| 1108 | */ |
| 1109 | static void |
| 1110 | find_kernel_nfs_mount_version(void) |
| 1111 | { |
| 1112 | int kernel_version; |
| 1113 | |
| 1114 | if (nfs_mount_version) |
| 1115 | return; |
| 1116 | |
| 1117 | nfs_mount_version = 4; /* default */ |
| 1118 | |
| 1119 | kernel_version = get_linux_version_code(); |
| 1120 | if (kernel_version) { |
| 1121 | if (kernel_version < KERNEL_VERSION(2,2,18)) |
| 1122 | nfs_mount_version = 3; |
| 1123 | /* else v4 since 2.3.99pre4 */ |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | static void |
| 1128 | get_mountport(struct pmap *pm_mnt, |
| 1129 | struct sockaddr_in *server_addr, |
| 1130 | long unsigned prog, |
| 1131 | long unsigned version, |
| 1132 | long unsigned proto, |
| 1133 | long unsigned port) |
| 1134 | { |
| 1135 | struct pmaplist *pmap; |
| 1136 | |
| 1137 | server_addr->sin_port = PMAPPORT; |
| 1138 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
| 1139 | * I understand it like "IPv6 for this is not 100% ready" */ |
| 1140 | pmap = pmap_getmaps(server_addr); |
| 1141 | |
| 1142 | if (version > MAX_NFSPROT) |
| 1143 | version = MAX_NFSPROT; |
| 1144 | if (!prog) |
| 1145 | prog = MOUNTPROG; |
| 1146 | pm_mnt->pm_prog = prog; |
| 1147 | pm_mnt->pm_vers = version; |
| 1148 | pm_mnt->pm_prot = proto; |
| 1149 | pm_mnt->pm_port = port; |
| 1150 | |
| 1151 | while (pmap) { |
| 1152 | if (pmap->pml_map.pm_prog != prog) |
| 1153 | goto next; |
| 1154 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
| 1155 | goto next; |
| 1156 | if (version > 2 && pmap->pml_map.pm_vers != version) |
| 1157 | goto next; |
| 1158 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
| 1159 | goto next; |
| 1160 | if (pmap->pml_map.pm_vers > MAX_NFSPROT |
| 1161 | || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) |
| 1162 | || (port && pmap->pml_map.pm_port != port) |
| 1163 | ) { |
| 1164 | goto next; |
| 1165 | } |
| 1166 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
| 1167 | next: |
| 1168 | pmap = pmap->pml_next; |
| 1169 | } |
| 1170 | if (!pm_mnt->pm_vers) |
| 1171 | pm_mnt->pm_vers = MOUNTVERS; |
| 1172 | if (!pm_mnt->pm_port) |
| 1173 | pm_mnt->pm_port = MOUNTPORT; |
| 1174 | if (!pm_mnt->pm_prot) |
| 1175 | pm_mnt->pm_prot = IPPROTO_TCP; |
| 1176 | } |
| 1177 | |
| 1178 | #if BB_MMU |
| 1179 | static int daemonize(void) |
| 1180 | { |
| 1181 | int pid = fork(); |
| 1182 | if (pid < 0) /* error */ |
| 1183 | return -errno; |
| 1184 | if (pid > 0) /* parent */ |
| 1185 | return 0; |
| 1186 | /* child */ |
| 1187 | close(0); |
| 1188 | xopen(bb_dev_null, O_RDWR); |
| 1189 | xdup2(0, 1); |
| 1190 | xdup2(0, 2); |
| 1191 | setsid(); |
| 1192 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
| 1193 | logmode = LOGMODE_SYSLOG; |
| 1194 | return 1; |
| 1195 | } |
| 1196 | #else |
| 1197 | static inline int daemonize(void) { return -ENOSYS; } |
| 1198 | #endif |
| 1199 | |
| 1200 | /* TODO */ |
| 1201 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) |
| 1202 | { |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | /* RPC strerror analogs are terminally idiotic: |
| 1207 | * *mandatory* prefix and \n at end. |
| 1208 | * This hopefully helps. Usage: |
| 1209 | * error_msg_rpc(clnt_*error*(" ")) */ |
| 1210 | static void error_msg_rpc(const char *msg) |
| 1211 | { |
| 1212 | int len; |
| 1213 | while (msg[0] == ' ' || msg[0] == ':') msg++; |
| 1214 | len = strlen(msg); |
| 1215 | while (len && msg[len-1] == '\n') len--; |
| 1216 | bb_error_msg("%.*s", len, msg); |
| 1217 | } |
| 1218 | |
| 1219 | /* NB: mp->xxx fields may be trashed on exit */ |
| 1220 | static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| 1221 | { |
| 1222 | CLIENT *mclient; |
| 1223 | char *hostname; |
| 1224 | char *pathname; |
| 1225 | char *mounthost; |
| 1226 | /* prior to 2.6.23, kernel took NFS options in a form of this struct |
| 1227 | * only. 2.6.23+ looks at data->version, and if it's not 1..6, |
| 1228 | * then data pointer is interpreted as a string. */ |
| 1229 | struct nfs_mount_data data; |
| 1230 | char *opt; |
| 1231 | struct hostent *hp; |
| 1232 | struct sockaddr_in server_addr; |
| 1233 | struct sockaddr_in mount_server_addr; |
| 1234 | int msock, fsock; |
| 1235 | union { |
| 1236 | struct fhstatus nfsv2; |
| 1237 | struct mountres3 nfsv3; |
| 1238 | } status; |
| 1239 | int daemonized; |
| 1240 | char *s; |
| 1241 | int port; |
| 1242 | int mountport; |
| 1243 | int proto; |
| 1244 | #if BB_MMU |
| 1245 | smallint bg = 0; |
| 1246 | #else |
| 1247 | enum { bg = 0 }; |
| 1248 | #endif |
| 1249 | int retry; |
| 1250 | int mountprog; |
| 1251 | int mountvers; |
| 1252 | int nfsprog; |
| 1253 | int nfsvers; |
| 1254 | int retval; |
| 1255 | /* these all are one-bit really. gcc 4.3.1 likes this combination: */ |
| 1256 | smallint tcp; |
| 1257 | smallint soft; |
| 1258 | int intr; |
| 1259 | int posix; |
| 1260 | int nocto; |
| 1261 | int noac; |
| 1262 | int nordirplus; |
| 1263 | int nolock; |
| 1264 | int noacl; |
| 1265 | |
| 1266 | find_kernel_nfs_mount_version(); |
| 1267 | |
| 1268 | daemonized = 0; |
| 1269 | mounthost = NULL; |
| 1270 | retval = ETIMEDOUT; |
| 1271 | msock = fsock = -1; |
| 1272 | mclient = NULL; |
| 1273 | |
| 1274 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
| 1275 | |
| 1276 | filteropts = xstrdup(filteropts); /* going to trash it later... */ |
| 1277 | |
| 1278 | hostname = xstrdup(mp->mnt_fsname); |
| 1279 | /* mount_main() guarantees that ':' is there */ |
| 1280 | s = strchr(hostname, ':'); |
| 1281 | pathname = s + 1; |
| 1282 | *s = '\0'; |
| 1283 | /* Ignore all but first hostname in replicated mounts |
| 1284 | * until they can be fully supported. (mack@sgi.com) */ |
| 1285 | s = strchr(hostname, ','); |
| 1286 | if (s) { |
| 1287 | *s = '\0'; |
| 1288 | bb_error_msg("warning: multiple hostnames not supported"); |
| 1289 | } |
| 1290 | |
| 1291 | server_addr.sin_family = AF_INET; |
| 1292 | if (!inet_aton(hostname, &server_addr.sin_addr)) { |
| 1293 | hp = gethostbyname(hostname); |
| 1294 | if (hp == NULL) { |
| 1295 | bb_herror_msg("%s", hostname); |
| 1296 | goto fail; |
| 1297 | } |
| 1298 | if (hp->h_length != (int)sizeof(struct in_addr)) { |
| 1299 | bb_error_msg_and_die("only IPv4 is supported"); |
| 1300 | } |
| 1301 | memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); |
| 1302 | } |
| 1303 | |
| 1304 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
| 1305 | |
| 1306 | /* add IP address to mtab options for use when unmounting */ |
| 1307 | |
| 1308 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
| 1309 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
| 1310 | } else { |
| 1311 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
| 1312 | mp->mnt_opts[0] ? "," : "", |
| 1313 | inet_ntoa(server_addr.sin_addr)); |
| 1314 | free(mp->mnt_opts); |
| 1315 | mp->mnt_opts = tmp; |
| 1316 | } |
| 1317 | |
| 1318 | /* Set default options. |
| 1319 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
| 1320 | * let the kernel decide. |
| 1321 | * timeo is filled in after we know whether it'll be TCP or UDP. */ |
| 1322 | memset(&data, 0, sizeof(data)); |
| 1323 | data.retrans = 3; |
| 1324 | data.acregmin = 3; |
| 1325 | data.acregmax = 60; |
| 1326 | data.acdirmin = 30; |
| 1327 | data.acdirmax = 60; |
| 1328 | data.namlen = NAME_MAX; |
| 1329 | |
| 1330 | soft = 0; |
| 1331 | intr = 0; |
| 1332 | posix = 0; |
| 1333 | nocto = 0; |
| 1334 | nolock = 0; |
| 1335 | noac = 0; |
| 1336 | nordirplus = 0; |
| 1337 | noacl = 0; |
| 1338 | retry = 10000; /* 10000 minutes ~ 1 week */ |
| 1339 | tcp = 1; /* nfs-utils uses tcp per default */ |
| 1340 | |
| 1341 | mountprog = MOUNTPROG; |
| 1342 | mountvers = 0; |
| 1343 | port = 0; |
| 1344 | mountport = 0; |
| 1345 | nfsprog = 100003; |
| 1346 | nfsvers = 0; |
| 1347 | |
| 1348 | /* parse options */ |
| 1349 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
| 1350 | char *opteq = strchr(opt, '='); |
| 1351 | if (opteq) { |
| 1352 | int val, idx; |
| 1353 | static const char options[] ALIGN1 = |
| 1354 | /* 0 */ "rsize\0" |
| 1355 | /* 1 */ "wsize\0" |
| 1356 | /* 2 */ "timeo\0" |
| 1357 | /* 3 */ "retrans\0" |
| 1358 | /* 4 */ "acregmin\0" |
| 1359 | /* 5 */ "acregmax\0" |
| 1360 | /* 6 */ "acdirmin\0" |
| 1361 | /* 7 */ "acdirmax\0" |
| 1362 | /* 8 */ "actimeo\0" |
| 1363 | /* 9 */ "retry\0" |
| 1364 | /* 10 */ "port\0" |
| 1365 | /* 11 */ "mountport\0" |
| 1366 | /* 12 */ "mounthost\0" |
| 1367 | /* 13 */ "mountprog\0" |
| 1368 | /* 14 */ "mountvers\0" |
| 1369 | /* 15 */ "nfsprog\0" |
| 1370 | /* 16 */ "nfsvers\0" |
| 1371 | /* 17 */ "vers\0" |
| 1372 | /* 18 */ "proto\0" |
| 1373 | /* 19 */ "namlen\0" |
| 1374 | /* 20 */ "addr\0"; |
| 1375 | |
| 1376 | *opteq++ = '\0'; |
| 1377 | idx = index_in_strings(options, opt); |
| 1378 | switch (idx) { |
| 1379 | case 12: // "mounthost" |
| 1380 | mounthost = xstrndup(opteq, |
| 1381 | strcspn(opteq, " \t\n\r,")); |
| 1382 | continue; |
| 1383 | case 18: // "proto" |
| 1384 | if (is_prefixed_with(opteq, "tcp")) |
| 1385 | tcp = 1; |
| 1386 | else if (is_prefixed_with(opteq, "udp")) |
| 1387 | tcp = 0; |
| 1388 | else |
| 1389 | bb_error_msg("warning: unrecognized proto= option"); |
| 1390 | continue; |
| 1391 | case 20: // "addr" - ignore |
| 1392 | continue; |
| 1393 | case -1: // unknown |
| 1394 | if (vfsflags & MS_REMOUNT) |
| 1395 | continue; |
| 1396 | } |
| 1397 | |
| 1398 | val = xatoi_positive(opteq); |
| 1399 | switch (idx) { |
| 1400 | case 0: // "rsize" |
| 1401 | data.rsize = val; |
| 1402 | continue; |
| 1403 | case 1: // "wsize" |
| 1404 | data.wsize = val; |
| 1405 | continue; |
| 1406 | case 2: // "timeo" |
| 1407 | data.timeo = val; |
| 1408 | continue; |
| 1409 | case 3: // "retrans" |
| 1410 | data.retrans = val; |
| 1411 | continue; |
| 1412 | case 4: // "acregmin" |
| 1413 | data.acregmin = val; |
| 1414 | continue; |
| 1415 | case 5: // "acregmax" |
| 1416 | data.acregmax = val; |
| 1417 | continue; |
| 1418 | case 6: // "acdirmin" |
| 1419 | data.acdirmin = val; |
| 1420 | continue; |
| 1421 | case 7: // "acdirmax" |
| 1422 | data.acdirmax = val; |
| 1423 | continue; |
| 1424 | case 8: // "actimeo" |
| 1425 | data.acregmin = val; |
| 1426 | data.acregmax = val; |
| 1427 | data.acdirmin = val; |
| 1428 | data.acdirmax = val; |
| 1429 | continue; |
| 1430 | case 9: // "retry" |
| 1431 | retry = val; |
| 1432 | continue; |
| 1433 | case 10: // "port" |
| 1434 | port = val; |
| 1435 | continue; |
| 1436 | case 11: // "mountport" |
| 1437 | mountport = val; |
| 1438 | continue; |
| 1439 | case 13: // "mountprog" |
| 1440 | mountprog = val; |
| 1441 | continue; |
| 1442 | case 14: // "mountvers" |
| 1443 | mountvers = val; |
| 1444 | continue; |
| 1445 | case 15: // "nfsprog" |
| 1446 | nfsprog = val; |
| 1447 | continue; |
| 1448 | case 16: // "nfsvers" |
| 1449 | case 17: // "vers" |
| 1450 | nfsvers = val; |
| 1451 | continue; |
| 1452 | case 19: // "namlen" |
| 1453 | //if (nfs_mount_version >= 2) |
| 1454 | data.namlen = val; |
| 1455 | //else |
| 1456 | // bb_error_msg("warning: option namlen is not supported\n"); |
| 1457 | continue; |
| 1458 | default: |
| 1459 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
| 1460 | goto fail; |
| 1461 | } |
| 1462 | } |
| 1463 | else { /* not of the form opt=val */ |
| 1464 | static const char options[] ALIGN1 = |
| 1465 | "bg\0" |
| 1466 | "fg\0" |
| 1467 | "soft\0" |
| 1468 | "hard\0" |
| 1469 | "intr\0" |
| 1470 | "posix\0" |
| 1471 | "cto\0" |
| 1472 | "ac\0" |
| 1473 | "tcp\0" |
| 1474 | "udp\0" |
| 1475 | "lock\0" |
| 1476 | "rdirplus\0" |
| 1477 | "acl\0"; |
| 1478 | int val = 1; |
| 1479 | if (is_prefixed_with(opt, "no")) { |
| 1480 | val = 0; |
| 1481 | opt += 2; |
| 1482 | } |
| 1483 | switch (index_in_strings(options, opt)) { |
| 1484 | case 0: // "bg" |
| 1485 | #if BB_MMU |
| 1486 | bg = val; |
| 1487 | #endif |
| 1488 | break; |
| 1489 | case 1: // "fg" |
| 1490 | #if BB_MMU |
| 1491 | bg = !val; |
| 1492 | #endif |
| 1493 | break; |
| 1494 | case 2: // "soft" |
| 1495 | soft = val; |
| 1496 | break; |
| 1497 | case 3: // "hard" |
| 1498 | soft = !val; |
| 1499 | break; |
| 1500 | case 4: // "intr" |
| 1501 | intr = val; |
| 1502 | break; |
| 1503 | case 5: // "posix" |
| 1504 | posix = val; |
| 1505 | break; |
| 1506 | case 6: // "cto" |
| 1507 | nocto = !val; |
| 1508 | break; |
| 1509 | case 7: // "ac" |
| 1510 | noac = !val; |
| 1511 | break; |
| 1512 | case 8: // "tcp" |
| 1513 | tcp = val; |
| 1514 | break; |
| 1515 | case 9: // "udp" |
| 1516 | tcp = !val; |
| 1517 | break; |
| 1518 | case 10: // "lock" |
| 1519 | if (nfs_mount_version >= 3) |
| 1520 | nolock = !val; |
| 1521 | else |
| 1522 | bb_error_msg("warning: option nolock is not supported"); |
| 1523 | break; |
| 1524 | case 11: //rdirplus |
| 1525 | nordirplus = !val; |
| 1526 | break; |
| 1527 | case 12: // acl |
| 1528 | noacl = !val; |
| 1529 | break; |
| 1530 | default: |
| 1531 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
| 1532 | goto fail; |
| 1533 | } |
| 1534 | } |
| 1535 | } |
| 1536 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
| 1537 | |
| 1538 | data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
| 1539 | | (intr ? NFS_MOUNT_INTR : 0) |
| 1540 | | (posix ? NFS_MOUNT_POSIX : 0) |
| 1541 | | (nocto ? NFS_MOUNT_NOCTO : 0) |
| 1542 | | (noac ? NFS_MOUNT_NOAC : 0) |
| 1543 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0) |
| 1544 | | (noacl ? NFS_MOUNT_NOACL : 0); |
| 1545 | if (nfs_mount_version >= 2) |
| 1546 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
| 1547 | if (nfs_mount_version >= 3) |
| 1548 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
| 1549 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
| 1550 | bb_error_msg("NFSv%d not supported", nfsvers); |
| 1551 | goto fail; |
| 1552 | } |
| 1553 | if (nfsvers && !mountvers) |
| 1554 | mountvers = (nfsvers < 3) ? 1 : nfsvers; |
| 1555 | if (nfsvers && nfsvers < mountvers) { |
| 1556 | mountvers = nfsvers; |
| 1557 | } |
| 1558 | |
| 1559 | /* Adjust options if none specified */ |
| 1560 | if (!data.timeo) |
| 1561 | data.timeo = tcp ? 70 : 7; |
| 1562 | |
| 1563 | data.version = nfs_mount_version; |
| 1564 | |
| 1565 | if (vfsflags & MS_REMOUNT) |
| 1566 | goto do_mount; |
| 1567 | |
| 1568 | /* |
| 1569 | * If the previous mount operation on the same host was |
| 1570 | * backgrounded, and the "bg" for this mount is also set, |
| 1571 | * give up immediately, to avoid the initial timeout. |
| 1572 | */ |
| 1573 | if (bg && we_saw_this_host_before(hostname)) { |
| 1574 | daemonized = daemonize(); |
| 1575 | if (daemonized <= 0) { /* parent or error */ |
| 1576 | retval = -daemonized; |
| 1577 | goto ret; |
| 1578 | } |
| 1579 | } |
| 1580 | |
| 1581 | /* Create mount daemon client */ |
| 1582 | /* See if the nfs host = mount host. */ |
| 1583 | if (mounthost) { |
| 1584 | if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
| 1585 | mount_server_addr.sin_family = AF_INET; |
| 1586 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
| 1587 | } else { |
| 1588 | hp = gethostbyname(mounthost); |
| 1589 | if (hp == NULL) { |
| 1590 | bb_herror_msg("%s", mounthost); |
| 1591 | goto fail; |
| 1592 | } |
| 1593 | if (hp->h_length != (int)sizeof(struct in_addr)) { |
| 1594 | bb_error_msg_and_die("only IPv4 is supported"); |
| 1595 | } |
| 1596 | mount_server_addr.sin_family = AF_INET; |
| 1597 | memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); |
| 1598 | } |
| 1599 | } |
| 1600 | |
| 1601 | /* |
| 1602 | * The following loop implements the mount retries. When the mount |
| 1603 | * times out, and the "bg" option is set, we background ourself |
| 1604 | * and continue trying. |
| 1605 | * |
| 1606 | * The case where the mount point is not present and the "bg" |
| 1607 | * option is set, is treated as a timeout. This is done to |
| 1608 | * support nested mounts. |
| 1609 | * |
| 1610 | * The "retry" count specified by the user is the number of |
| 1611 | * minutes to retry before giving up. |
| 1612 | */ |
| 1613 | { |
| 1614 | struct timeval total_timeout; |
| 1615 | struct timeval retry_timeout; |
| 1616 | struct pmap pm_mnt; |
| 1617 | time_t t; |
| 1618 | time_t prevt; |
| 1619 | time_t timeout; |
| 1620 | |
| 1621 | retry_timeout.tv_sec = 3; |
| 1622 | retry_timeout.tv_usec = 0; |
| 1623 | total_timeout.tv_sec = 20; |
| 1624 | total_timeout.tv_usec = 0; |
| 1625 | /* FIXME: use monotonic()? */ |
| 1626 | timeout = time(NULL) + 60 * retry; |
| 1627 | prevt = 0; |
| 1628 | t = 30; |
| 1629 | retry: |
| 1630 | /* Be careful not to use too many CPU cycles */ |
| 1631 | if (t - prevt < 30) |
| 1632 | sleep(30); |
| 1633 | |
| 1634 | get_mountport(&pm_mnt, &mount_server_addr, |
| 1635 | mountprog, |
| 1636 | mountvers, |
| 1637 | proto, |
| 1638 | mountport); |
| 1639 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
| 1640 | |
| 1641 | /* contact the mount daemon via TCP */ |
| 1642 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| 1643 | msock = RPC_ANYSOCK; |
| 1644 | |
| 1645 | switch (pm_mnt.pm_prot) { |
| 1646 | case IPPROTO_UDP: |
| 1647 | mclient = clntudp_create(&mount_server_addr, |
| 1648 | pm_mnt.pm_prog, |
| 1649 | pm_mnt.pm_vers, |
| 1650 | retry_timeout, |
| 1651 | &msock); |
| 1652 | if (mclient) |
| 1653 | break; |
| 1654 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| 1655 | msock = RPC_ANYSOCK; |
| 1656 | case IPPROTO_TCP: |
| 1657 | mclient = clnttcp_create(&mount_server_addr, |
| 1658 | pm_mnt.pm_prog, |
| 1659 | pm_mnt.pm_vers, |
| 1660 | &msock, 0, 0); |
| 1661 | break; |
| 1662 | default: |
| 1663 | mclient = NULL; |
| 1664 | } |
| 1665 | if (!mclient) { |
| 1666 | if (!daemonized && prevt == 0) |
| 1667 | error_msg_rpc(clnt_spcreateerror(" ")); |
| 1668 | } else { |
| 1669 | enum clnt_stat clnt_stat; |
| 1670 | |
| 1671 | /* Try to mount hostname:pathname */ |
| 1672 | mclient->cl_auth = authunix_create_default(); |
| 1673 | |
| 1674 | /* Make pointers in xdr_mountres3 NULL so |
| 1675 | * that xdr_array allocates memory for us |
| 1676 | */ |
| 1677 | memset(&status, 0, sizeof(status)); |
| 1678 | |
| 1679 | if (pm_mnt.pm_vers == 3) |
| 1680 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
| 1681 | (xdrproc_t) xdr_dirpath, |
| 1682 | (caddr_t) &pathname, |
| 1683 | (xdrproc_t) xdr_mountres3, |
| 1684 | (caddr_t) &status, |
| 1685 | total_timeout); |
| 1686 | else |
| 1687 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
| 1688 | (xdrproc_t) xdr_dirpath, |
| 1689 | (caddr_t) &pathname, |
| 1690 | (xdrproc_t) xdr_fhstatus, |
| 1691 | (caddr_t) &status, |
| 1692 | total_timeout); |
| 1693 | |
| 1694 | if (clnt_stat == RPC_SUCCESS) |
| 1695 | goto prepare_kernel_data; /* we're done */ |
| 1696 | if (errno != ECONNREFUSED) { |
| 1697 | error_msg_rpc(clnt_sperror(mclient, " ")); |
| 1698 | goto fail; /* don't retry */ |
| 1699 | } |
| 1700 | /* Connection refused */ |
| 1701 | if (!daemonized && prevt == 0) /* print just once */ |
| 1702 | error_msg_rpc(clnt_sperror(mclient, " ")); |
| 1703 | auth_destroy(mclient->cl_auth); |
| 1704 | clnt_destroy(mclient); |
| 1705 | mclient = NULL; |
| 1706 | close(msock); |
| 1707 | msock = -1; |
| 1708 | } |
| 1709 | |
| 1710 | /* Timeout. We are going to retry... maybe */ |
| 1711 | if (!bg) |
| 1712 | goto fail; |
| 1713 | if (!daemonized) { |
| 1714 | daemonized = daemonize(); |
| 1715 | if (daemonized <= 0) { /* parent or error */ |
| 1716 | retval = -daemonized; |
| 1717 | goto ret; |
| 1718 | } |
| 1719 | } |
| 1720 | prevt = t; |
| 1721 | t = time(NULL); |
| 1722 | if (t >= timeout) |
| 1723 | /* TODO error message */ |
| 1724 | goto fail; |
| 1725 | |
| 1726 | goto retry; |
| 1727 | } |
| 1728 | |
| 1729 | prepare_kernel_data: |
| 1730 | |
| 1731 | if (nfsvers == 2) { |
| 1732 | if (status.nfsv2.fhs_status != 0) { |
| 1733 | bb_error_msg("%s:%s failed, reason given by server: %s", |
| 1734 | hostname, pathname, |
| 1735 | nfs_strerror(status.nfsv2.fhs_status)); |
| 1736 | goto fail; |
| 1737 | } |
| 1738 | memcpy(data.root.data, |
| 1739 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| 1740 | NFS_FHSIZE); |
| 1741 | data.root.size = NFS_FHSIZE; |
| 1742 | memcpy(data.old_root.data, |
| 1743 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| 1744 | NFS_FHSIZE); |
| 1745 | } else { |
| 1746 | fhandle3 *my_fhandle; |
| 1747 | if (status.nfsv3.fhs_status != 0) { |
| 1748 | bb_error_msg("%s:%s failed, reason given by server: %s", |
| 1749 | hostname, pathname, |
| 1750 | nfs_strerror(status.nfsv3.fhs_status)); |
| 1751 | goto fail; |
| 1752 | } |
| 1753 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
| 1754 | memset(data.old_root.data, 0, NFS_FHSIZE); |
| 1755 | memset(&data.root, 0, sizeof(data.root)); |
| 1756 | data.root.size = my_fhandle->fhandle3_len; |
| 1757 | memcpy(data.root.data, |
| 1758 | (char *) my_fhandle->fhandle3_val, |
| 1759 | my_fhandle->fhandle3_len); |
| 1760 | |
| 1761 | data.flags |= NFS_MOUNT_VER3; |
| 1762 | } |
| 1763 | |
| 1764 | /* Create nfs socket for kernel */ |
| 1765 | if (tcp) { |
| 1766 | if (nfs_mount_version < 3) { |
| 1767 | bb_error_msg("NFS over TCP is not supported"); |
| 1768 | goto fail; |
| 1769 | } |
| 1770 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 1771 | } else |
| 1772 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 1773 | if (fsock < 0) { |
| 1774 | bb_perror_msg("nfs socket"); |
| 1775 | goto fail; |
| 1776 | } |
| 1777 | if (bindresvport(fsock, 0) < 0) { |
| 1778 | bb_perror_msg("nfs bindresvport"); |
| 1779 | goto fail; |
| 1780 | } |
| 1781 | if (port == 0) { |
| 1782 | server_addr.sin_port = PMAPPORT; |
| 1783 | port = pmap_getport(&server_addr, nfsprog, nfsvers, |
| 1784 | tcp ? IPPROTO_TCP : IPPROTO_UDP); |
| 1785 | if (port == 0) |
| 1786 | port = NFS_PORT; |
| 1787 | } |
| 1788 | server_addr.sin_port = htons(port); |
| 1789 | |
| 1790 | /* Prepare data structure for kernel */ |
| 1791 | data.fd = fsock; |
| 1792 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
| 1793 | strncpy(data.hostname, hostname, sizeof(data.hostname)); |
| 1794 | |
| 1795 | /* Clean up */ |
| 1796 | auth_destroy(mclient->cl_auth); |
| 1797 | clnt_destroy(mclient); |
| 1798 | close(msock); |
| 1799 | msock = -1; |
| 1800 | |
| 1801 | if (bg) { |
| 1802 | /* We must wait until mount directory is available */ |
| 1803 | struct stat statbuf; |
| 1804 | int delay = 1; |
| 1805 | while (stat(mp->mnt_dir, &statbuf) == -1) { |
| 1806 | if (!daemonized) { |
| 1807 | daemonized = daemonize(); |
| 1808 | if (daemonized <= 0) { /* parent or error */ |
| 1809 | /* FIXME: parent doesn't close fsock - ??! */ |
| 1810 | retval = -daemonized; |
| 1811 | goto ret; |
| 1812 | } |
| 1813 | } |
| 1814 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
| 1815 | delay *= 2; |
| 1816 | if (delay > 30) |
| 1817 | delay = 30; |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | /* Perform actual mount */ |
| 1822 | do_mount: |
| 1823 | retval = mount_it_now(mp, vfsflags, (char*)&data); |
| 1824 | goto ret; |
| 1825 | |
| 1826 | /* Abort */ |
| 1827 | fail: |
| 1828 | if (msock >= 0) { |
| 1829 | if (mclient) { |
| 1830 | auth_destroy(mclient->cl_auth); |
| 1831 | clnt_destroy(mclient); |
| 1832 | } |
| 1833 | close(msock); |
| 1834 | } |
| 1835 | if (fsock >= 0) |
| 1836 | close(fsock); |
| 1837 | |
| 1838 | ret: |
| 1839 | free(hostname); |
| 1840 | free(mounthost); |
| 1841 | free(filteropts); |
| 1842 | return retval; |
| 1843 | } |
| 1844 | |
| 1845 | #else // !ENABLE_FEATURE_MOUNT_NFS |
| 1846 | |
| 1847 | /* Linux 2.6.23+ supports nfs mounts with options passed as a string. |
| 1848 | * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS. |
| 1849 | * (However, note that then you lose any chances that NFS over IPv6 would work). |
| 1850 | */ |
| 1851 | static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| 1852 | { |
| 1853 | len_and_sockaddr *lsa; |
| 1854 | char *opts; |
| 1855 | char *end; |
| 1856 | char *dotted; |
| 1857 | int ret; |
| 1858 | |
| 1859 | # if ENABLE_FEATURE_IPV6 |
| 1860 | end = strchr(mp->mnt_fsname, ']'); |
| 1861 | if (end && end[1] == ':') |
| 1862 | end++; |
| 1863 | else |
| 1864 | # endif |
| 1865 | /* mount_main() guarantees that ':' is there */ |
| 1866 | end = strchr(mp->mnt_fsname, ':'); |
| 1867 | |
| 1868 | *end = '\0'; |
| 1869 | lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0); |
| 1870 | *end = ':'; |
| 1871 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
| 1872 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa); |
| 1873 | opts = xasprintf("%s%saddr=%s", |
| 1874 | filteropts ? filteropts : "", |
| 1875 | filteropts ? "," : "", |
| 1876 | dotted |
| 1877 | ); |
| 1878 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted); |
| 1879 | ret = mount_it_now(mp, vfsflags, opts); |
| 1880 | if (ENABLE_FEATURE_CLEAN_UP) free(opts); |
| 1881 | |
| 1882 | return ret; |
| 1883 | } |
| 1884 | |
| 1885 | #endif // !ENABLE_FEATURE_MOUNT_NFS |
| 1886 | |
| 1887 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
| 1888 | // type detection. Returns 0 for success, nonzero for failure. |
| 1889 | // NB: mp->xxx fields may be trashed on exit |
| 1890 | static int singlemount(struct mntent *mp, int ignore_busy) |
| 1891 | { |
| 1892 | int rc = -1; |
| 1893 | unsigned long vfsflags; |
| 1894 | char *loopFile = NULL, *filteropts = NULL; |
| 1895 | llist_t *fl = NULL; |
| 1896 | struct stat st; |
| 1897 | |
| 1898 | errno = 0; |
| 1899 | |
| 1900 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
| 1901 | |
| 1902 | // Treat fstype "auto" as unspecified |
| 1903 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
| 1904 | mp->mnt_type = NULL; |
| 1905 | |
| 1906 | // Might this be a virtual filesystem? |
| 1907 | if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) { |
| 1908 | char *args[35]; |
| 1909 | char *s; |
| 1910 | int n; |
| 1911 | // fsname: "cmd#arg1#arg2..." |
| 1912 | // WARNING: allows execution of arbitrary commands! |
| 1913 | // Try "mount 'sh#-c#sh' bogus_dir". |
| 1914 | // It is safe ONLY because non-root |
| 1915 | // cannot use two-argument mount command |
| 1916 | // and using one-argument "mount 'sh#-c#sh'" doesn't work: |
| 1917 | // "mount: can't find sh#-c#sh in /etc/fstab" |
| 1918 | // (if /etc/fstab has it, it's ok: root sets up /etc/fstab). |
| 1919 | |
| 1920 | s = mp->mnt_fsname; |
| 1921 | n = 0; |
| 1922 | args[n++] = s; |
| 1923 | while (*s && n < 35 - 2) { |
| 1924 | if (*s++ == '#' && *s != '#') { |
| 1925 | s[-1] = '\0'; |
| 1926 | args[n++] = s; |
| 1927 | } |
| 1928 | } |
| 1929 | args[n++] = mp->mnt_dir; |
| 1930 | args[n] = NULL; |
| 1931 | rc = spawn_and_wait(args); |
| 1932 | goto report_error; |
| 1933 | } |
| 1934 | |
| 1935 | // Might this be an CIFS filesystem? |
| 1936 | if (ENABLE_FEATURE_MOUNT_CIFS |
| 1937 | && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) |
| 1938 | && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') |
| 1939 | && mp->mnt_fsname[0] == mp->mnt_fsname[1] |
| 1940 | ) { |
| 1941 | int len; |
| 1942 | char c; |
| 1943 | char *hostname, *share; |
| 1944 | len_and_sockaddr *lsa; |
| 1945 | |
| 1946 | // Parse mp->mnt_fsname of the form "//hostname/share[/dir1/dir2]" |
| 1947 | |
| 1948 | hostname = mp->mnt_fsname + 2; |
| 1949 | len = strcspn(hostname, "/\\"); |
| 1950 | share = hostname + len + 1; |
| 1951 | if (len == 0 // 3rd char is a [back]slash (IOW: empty hostname) |
| 1952 | || share[-1] == '\0' // no [back]slash after hostname |
| 1953 | || share[0] == '\0' // empty share name |
| 1954 | ) { |
| 1955 | goto report_error; |
| 1956 | } |
| 1957 | c = share[-1]; |
| 1958 | share[-1] = '\0'; |
| 1959 | len = strcspn(share, "/\\"); |
| 1960 | |
| 1961 | // "unc=\\hostname\share" option is mandatory |
| 1962 | // after CIFS option parsing was rewritten in Linux 3.4. |
| 1963 | // Must use backslashes. |
| 1964 | // If /dir1/dir2 is present, also add "prefixpath=dir1/dir2" |
| 1965 | { |
| 1966 | char *unc = xasprintf( |
| 1967 | share[len] != '\0' /* "/dir1/dir2" exists? */ |
| 1968 | ? "unc=\\\\%s\\%.*s,prefixpath=%s" |
| 1969 | : "unc=\\\\%s\\%.*s", |
| 1970 | hostname, |
| 1971 | len, share, |
| 1972 | share + len + 1 /* "dir1/dir2" */ |
| 1973 | ); |
| 1974 | parse_mount_options(unc, &filteropts); |
| 1975 | if (ENABLE_FEATURE_CLEAN_UP) free(unc); |
| 1976 | } |
| 1977 | |
| 1978 | lsa = host2sockaddr(hostname, 0); |
| 1979 | share[-1] = c; |
| 1980 | if (!lsa) |
| 1981 | goto report_error; |
| 1982 | |
| 1983 | // If there is no "ip=..." option yet |
| 1984 | if (!is_prefixed_with(filteropts, ",ip="+1) |
| 1985 | && !strstr(filteropts, ",ip=") |
| 1986 | ) { |
| 1987 | char *dotted, *ip; |
| 1988 | // Insert "ip=..." option into options |
| 1989 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
| 1990 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa); |
| 1991 | ip = xasprintf("ip=%s", dotted); |
| 1992 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted); |
| 1993 | // Note: IPv6 scoped addresses ("host%iface", see RFC 4007) should be |
| 1994 | // handled by libc in getnameinfo() (inside xmalloc_sockaddr2dotted_noport()). |
| 1995 | // Currently, glibc does not support that (has no NI_NUMERICSCOPE), |
| 1996 | // musl apparently does. This results in "ip=numericIPv6%iface_name" |
| 1997 | // (instead of _numeric_ iface_id) with glibc. |
| 1998 | // This probably should be fixed in glibc, not here. |
| 1999 | // The workaround is to manually specify correct "ip=ADDR%n" option. |
| 2000 | parse_mount_options(ip, &filteropts); |
| 2001 | if (ENABLE_FEATURE_CLEAN_UP) free(ip); |
| 2002 | } |
| 2003 | |
| 2004 | mp->mnt_type = (char*)"cifs"; |
| 2005 | rc = mount_it_now(mp, vfsflags, filteropts); |
| 2006 | |
| 2007 | goto report_error; |
| 2008 | } |
| 2009 | |
| 2010 | // Might this be an NFS filesystem? |
| 2011 | if ((!mp->mnt_type || is_prefixed_with(mp->mnt_type, "nfs")) |
| 2012 | && strchr(mp->mnt_fsname, ':') != NULL |
| 2013 | ) { |
| 2014 | if (!mp->mnt_type) |
| 2015 | mp->mnt_type = (char*)"nfs"; |
| 2016 | rc = nfsmount(mp, vfsflags, filteropts); |
| 2017 | goto report_error; |
| 2018 | } |
| 2019 | |
| 2020 | // Look at the file. (Not found isn't a failure for remount, or for |
| 2021 | // a synthetic filesystem like proc or sysfs.) |
| 2022 | // (We use stat, not lstat, in order to allow |
| 2023 | // mount symlink_to_file_or_blkdev dir) |
| 2024 | if (!stat(mp->mnt_fsname, &st) |
| 2025 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) |
| 2026 | ) { |
| 2027 | // Do we need to allocate a loopback device for it? |
| 2028 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
| 2029 | loopFile = bb_simplify_path(mp->mnt_fsname); |
| 2030 | mp->mnt_fsname = NULL; // will receive malloced loop dev name |
| 2031 | if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) { |
| 2032 | if (errno == EPERM || errno == EACCES) |
| 2033 | bb_error_msg("%s", bb_msg_perm_denied_are_you_root); |
| 2034 | else |
| 2035 | bb_perror_msg("can't setup loop device"); |
| 2036 | return errno; |
| 2037 | } |
| 2038 | |
| 2039 | // Autodetect bind mounts |
| 2040 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
| 2041 | vfsflags |= MS_BIND; |
| 2042 | } |
| 2043 | |
| 2044 | // If we know the fstype (or don't need to), jump straight |
| 2045 | // to the actual mount. |
| 2046 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) { |
| 2047 | char *next; |
| 2048 | for (;;) { |
| 2049 | next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL; |
| 2050 | if (next) |
| 2051 | *next = '\0'; |
| 2052 | rc = mount_it_now(mp, vfsflags, filteropts); |
| 2053 | if (rc == 0 || !next) |
| 2054 | break; |
| 2055 | mp->mnt_type = next + 1; |
| 2056 | } |
| 2057 | } else { |
| 2058 | // Loop through filesystem types until mount succeeds |
| 2059 | // or we run out |
| 2060 | |
| 2061 | // Initialize list of block backed filesystems. |
| 2062 | // This has to be done here so that during "mount -a", |
| 2063 | // mounts after /proc shows up can autodetect. |
| 2064 | if (!fslist) { |
| 2065 | fslist = get_block_backed_filesystems(); |
| 2066 | if (ENABLE_FEATURE_CLEAN_UP && fslist) |
| 2067 | atexit(delete_block_backed_filesystems); |
| 2068 | } |
| 2069 | |
| 2070 | for (fl = fslist; fl; fl = fl->link) { |
| 2071 | mp->mnt_type = fl->data; |
| 2072 | rc = mount_it_now(mp, vfsflags, filteropts); |
| 2073 | if (rc == 0) |
| 2074 | break; |
| 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | // If mount failed, clean up loop file (if any). |
| 2079 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
| 2080 | del_loop(mp->mnt_fsname); |
| 2081 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 2082 | free(loopFile); |
| 2083 | /* No, "rc != 0" needs it: free(mp->mnt_fsname); */ |
| 2084 | } |
| 2085 | } |
| 2086 | |
| 2087 | report_error: |
| 2088 | if (ENABLE_FEATURE_CLEAN_UP) |
| 2089 | free(filteropts); |
| 2090 | |
| 2091 | if (errno == EBUSY && ignore_busy) |
| 2092 | return 0; |
| 2093 | if (errno == ENOENT && (vfsflags & MOUNT_NOFAIL)) |
| 2094 | return 0; |
| 2095 | if (rc != 0) |
| 2096 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
| 2097 | return rc; |
| 2098 | } |
| 2099 | |
| 2100 | // -O support |
| 2101 | // -O interprets a list of filter options which select whether a mount |
| 2102 | // point will be mounted: only mounts with options matching *all* filtering |
| 2103 | // options will be selected. |
| 2104 | // By default each -O filter option must be present in the list of mount |
| 2105 | // options, but if it is prefixed by "no" then it must be absent. |
| 2106 | // For example, |
| 2107 | // -O a,nob,c matches -o a,c but fails to match -o a,b,c |
| 2108 | // (and also fails to match -o a because -o c is absent). |
| 2109 | // |
| 2110 | // It is different from -t in that each option is matched exactly; a leading |
| 2111 | // "no" at the beginning of one option does not negate the rest. |
| 2112 | static int match_opt(const char *fs_opt_in, const char *O_opt) |
| 2113 | { |
| 2114 | if (!O_opt) |
| 2115 | return 1; |
| 2116 | |
| 2117 | while (*O_opt) { |
| 2118 | const char *fs_opt = fs_opt_in; |
| 2119 | int O_len; |
| 2120 | int match; |
| 2121 | |
| 2122 | // If option begins with "no" then treat as an inverted match: |
| 2123 | // matching is a failure |
| 2124 | match = 0; |
| 2125 | if (O_opt[0] == 'n' && O_opt[1] == 'o') { |
| 2126 | match = 1; |
| 2127 | O_opt += 2; |
| 2128 | } |
| 2129 | // Isolate the current O option |
| 2130 | O_len = strchrnul(O_opt, ',') - O_opt; |
| 2131 | // Check for a match against existing options |
| 2132 | while (1) { |
| 2133 | if (strncmp(fs_opt, O_opt, O_len) == 0 |
| 2134 | && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',') |
| 2135 | ) { |
| 2136 | if (match) |
| 2137 | return 0; // "no" prefix, but option found |
| 2138 | match = 1; // current O option found, go check next one |
| 2139 | break; |
| 2140 | } |
| 2141 | fs_opt = strchr(fs_opt, ','); |
| 2142 | if (!fs_opt) |
| 2143 | break; |
| 2144 | fs_opt++; |
| 2145 | } |
| 2146 | if (match == 0) |
| 2147 | return 0; // match wanted but not found |
| 2148 | if (O_opt[O_len] == '\0') // end? |
| 2149 | break; |
| 2150 | // Step to the next O option |
| 2151 | O_opt += O_len + 1; |
| 2152 | } |
| 2153 | // If we get here then everything matched |
| 2154 | return 1; |
| 2155 | } |
| 2156 | |
| 2157 | // Parse options, if necessary parse fstab/mtab, and call singlemount for |
| 2158 | // each directory to be mounted. |
| 2159 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 2160 | int mount_main(int argc UNUSED_PARAM, char **argv) |
| 2161 | { |
| 2162 | char *cmdopts = xzalloc(1); |
| 2163 | char *fstype = NULL; |
| 2164 | char *O_optmatch = NULL; |
| 2165 | char *storage_path; |
| 2166 | llist_t *lst_o = NULL; |
| 2167 | const char *fstabname = "/etc/fstab"; |
| 2168 | FILE *fstab; |
| 2169 | int i, j; |
| 2170 | int rc = EXIT_SUCCESS; |
| 2171 | unsigned long cmdopt_flags; |
| 2172 | unsigned opt; |
| 2173 | struct mntent mtpair[2], *mtcur = mtpair; |
| 2174 | IF_NOT_DESKTOP(const int nonroot = 0;) |
| 2175 | |
| 2176 | IF_DESKTOP(int nonroot = ) sanitize_env_if_suid(); |
| 2177 | |
| 2178 | INIT_G(); |
| 2179 | |
| 2180 | // Parse long options, like --bind and --move. Note that -o option |
| 2181 | // and --option are synonymous. Yes, this means --remount,rw works. |
| 2182 | for (i = j = 1; argv[i]; i++) { |
| 2183 | if (argv[i][0] == '-' && argv[i][1] == '-') |
| 2184 | append_mount_options(&cmdopts, argv[i] + 2); |
| 2185 | else |
| 2186 | argv[j++] = argv[i]; |
| 2187 | } |
| 2188 | argv[j] = NULL; |
| 2189 | |
| 2190 | // Parse remaining options |
| 2191 | // Max 2 params; -o is a list, -v is a counter |
| 2192 | opt_complementary = "?2" IF_FEATURE_MOUNT_VERBOSE("vv"); |
| 2193 | opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch |
| 2194 | IF_FEATURE_MOUNT_OTHERTAB(, &fstabname) |
| 2195 | IF_FEATURE_MOUNT_VERBOSE(, &verbose)); |
| 2196 | while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o |
| 2197 | if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r |
| 2198 | if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w |
| 2199 | argv += optind; |
| 2200 | |
| 2201 | // If we have no arguments, show currently mounted filesystems |
| 2202 | if (!argv[0]) { |
| 2203 | if (!(opt & OPT_a)) { |
| 2204 | FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
| 2205 | |
| 2206 | if (!mountTable) |
| 2207 | bb_error_msg_and_die("no %s", bb_path_mtab_file); |
| 2208 | |
| 2209 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
| 2210 | GETMNTENT_BUFSIZE)) |
| 2211 | { |
| 2212 | // Don't show rootfs. FIXME: why?? |
| 2213 | // util-linux 2.12a happily shows rootfs... |
| 2214 | //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue; |
| 2215 | |
| 2216 | if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0) |
| 2217 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
| 2218 | mtpair->mnt_dir, mtpair->mnt_type, |
| 2219 | mtpair->mnt_opts); |
| 2220 | } |
| 2221 | if (ENABLE_FEATURE_CLEAN_UP) |
| 2222 | endmntent(mountTable); |
| 2223 | return EXIT_SUCCESS; |
| 2224 | } |
| 2225 | storage_path = NULL; |
| 2226 | } else { |
| 2227 | // When we have two arguments, the second is the directory and we can |
| 2228 | // skip looking at fstab entirely. We can always abspath() the directory |
| 2229 | // argument when we get it. |
| 2230 | if (argv[1]) { |
| 2231 | if (nonroot) |
| 2232 | bb_error_msg_and_die("%s", bb_msg_you_must_be_root); |
| 2233 | mtpair->mnt_fsname = argv[0]; |
| 2234 | mtpair->mnt_dir = argv[1]; |
| 2235 | mtpair->mnt_type = fstype; |
| 2236 | mtpair->mnt_opts = cmdopts; |
| 2237 | resolve_mount_spec(&mtpair->mnt_fsname); |
| 2238 | rc = singlemount(mtpair, /*ignore_busy:*/ 0); |
| 2239 | return rc; |
| 2240 | } |
| 2241 | storage_path = bb_simplify_path(argv[0]); // malloced |
| 2242 | } |
| 2243 | |
| 2244 | // Past this point, we are handling either "mount -a [opts]" |
| 2245 | // or "mount [opts] single_param" |
| 2246 | |
| 2247 | cmdopt_flags = parse_mount_options(cmdopts, NULL); |
| 2248 | if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags |
| 2249 | bb_error_msg_and_die("%s", bb_msg_you_must_be_root); |
| 2250 | |
| 2251 | // If we have a shared subtree flag, don't worry about fstab or mtab. |
| 2252 | if (ENABLE_FEATURE_MOUNT_FLAGS |
| 2253 | && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) |
| 2254 | ) { |
| 2255 | // verbose_mount(source, target, type, flags, data) |
| 2256 | rc = verbose_mount("", argv[0], "", cmdopt_flags, ""); |
| 2257 | if (rc) |
| 2258 | bb_simple_perror_msg_and_die(argv[0]); |
| 2259 | return rc; |
| 2260 | } |
| 2261 | |
| 2262 | // A malicious user could overmount /usr without this. |
| 2263 | if (ENABLE_FEATURE_MOUNT_OTHERTAB && nonroot) |
| 2264 | fstabname = "/etc/fstab"; |
| 2265 | // Open either fstab or mtab |
| 2266 | if (cmdopt_flags & MS_REMOUNT) { |
| 2267 | // WARNING. I am not sure this matches util-linux's |
| 2268 | // behavior. It's possible util-linux does not |
| 2269 | // take -o opts from mtab (takes only mount source). |
| 2270 | fstabname = bb_path_mtab_file; |
| 2271 | } |
| 2272 | fstab = setmntent(fstabname, "r"); |
| 2273 | if (!fstab) |
| 2274 | bb_perror_msg_and_die("can't read '%s'", fstabname); |
| 2275 | |
| 2276 | // Loop through entries until we find what we're looking for |
| 2277 | memset(mtpair, 0, sizeof(mtpair)); |
| 2278 | for (;;) { |
| 2279 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair); |
| 2280 | |
| 2281 | // Get next fstab entry |
| 2282 | if (!getmntent_r(fstab, mtcur, getmntent_buf |
| 2283 | + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0), |
| 2284 | GETMNTENT_BUFSIZE/2) |
| 2285 | ) { // End of fstab/mtab is reached |
| 2286 | mtcur = mtother; // the thing we found last time |
| 2287 | break; |
| 2288 | } |
| 2289 | |
| 2290 | // If we're trying to mount something specific and this isn't it, |
| 2291 | // skip it. Note we must match the exact text in fstab (ala |
| 2292 | // "proc") or a full path from root |
| 2293 | if (argv[0]) { |
| 2294 | |
| 2295 | // Is this what we're looking for? |
| 2296 | if (strcmp(argv[0], mtcur->mnt_fsname) != 0 |
| 2297 | && strcmp(storage_path, mtcur->mnt_fsname) != 0 |
| 2298 | && strcmp(argv[0], mtcur->mnt_dir) != 0 |
| 2299 | && strcmp(storage_path, mtcur->mnt_dir) != 0 |
| 2300 | ) { |
| 2301 | continue; // no |
| 2302 | } |
| 2303 | |
| 2304 | // Remember this entry. Something later may have |
| 2305 | // overmounted it, and we want the _last_ match. |
| 2306 | mtcur = mtother; |
| 2307 | |
| 2308 | // If we're mounting all |
| 2309 | } else { |
| 2310 | struct mntent *mp; |
| 2311 | // No, mount -a won't mount anything, |
| 2312 | // even user mounts, for mere humans |
| 2313 | if (nonroot) |
| 2314 | bb_error_msg_and_die("%s", bb_msg_you_must_be_root); |
| 2315 | |
| 2316 | // Does type match? (NULL matches always) |
| 2317 | if (!match_fstype(mtcur, fstype)) |
| 2318 | continue; |
| 2319 | |
| 2320 | // Skip noauto and swap anyway |
| 2321 | if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
| 2322 | // swap is bogus "fstype", parse_mount_options can't check fstypes |
| 2323 | || strcasecmp(mtcur->mnt_type, "swap") == 0 |
| 2324 | ) { |
| 2325 | continue; |
| 2326 | } |
| 2327 | |
| 2328 | // Does (at least one) option match? |
| 2329 | // (NULL matches always) |
| 2330 | if (!match_opt(mtcur->mnt_opts, O_optmatch)) |
| 2331 | continue; |
| 2332 | |
| 2333 | resolve_mount_spec(&mtcur->mnt_fsname); |
| 2334 | |
| 2335 | // NFS mounts want this to be xrealloc-able |
| 2336 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| 2337 | |
| 2338 | // If nothing is mounted on this directory... |
| 2339 | // (otherwise repeated "mount -a" mounts everything again) |
| 2340 | mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
| 2341 | // We do not check fsname match of found mount point - |
| 2342 | // "/" may have fsname of "/dev/root" while fstab |
| 2343 | // says "/dev/something_else". |
| 2344 | if (mp) { |
| 2345 | if (verbose) { |
| 2346 | bb_error_msg("according to %s, " |
| 2347 | "%s is already mounted on %s", |
| 2348 | bb_path_mtab_file, |
| 2349 | mp->mnt_fsname, mp->mnt_dir); |
| 2350 | } |
| 2351 | } else { |
| 2352 | // ...mount this thing |
| 2353 | if (singlemount(mtcur, /*ignore_busy:*/ 1)) { |
| 2354 | // Count number of failed mounts |
| 2355 | rc++; |
| 2356 | } |
| 2357 | } |
| 2358 | free(mtcur->mnt_opts); |
| 2359 | } |
| 2360 | } |
| 2361 | |
| 2362 | // End of fstab/mtab is reached. |
| 2363 | // Were we looking for something specific? |
| 2364 | if (argv[0]) { // yes |
| 2365 | unsigned long l; |
| 2366 | |
| 2367 | // If we didn't find anything, complain |
| 2368 | if (!mtcur->mnt_fsname) |
| 2369 | bb_error_msg_and_die("can't find %s in %s", |
| 2370 | argv[0], fstabname); |
| 2371 | |
| 2372 | // What happens when we try to "mount swap_partition"? |
| 2373 | // (fstab containts "swap_partition swap swap defaults 0 0") |
| 2374 | // util-linux-ng 2.13.1 does this: |
| 2375 | // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory) |
| 2376 | // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory) |
| 2377 | // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory) |
| 2378 | // write(2, "mount: mount point swap does not exist\n", 39) = 39 |
| 2379 | // exit_group(32) = ? |
| 2380 | #if 0 |
| 2381 | // In case we want to simply skip swap partitions: |
| 2382 | l = parse_mount_options(mtcur->mnt_opts, NULL); |
| 2383 | if ((l & MOUNT_SWAP) |
| 2384 | // swap is bogus "fstype", parse_mount_options can't check fstypes |
| 2385 | || strcasecmp(mtcur->mnt_type, "swap") == 0 |
| 2386 | ) { |
| 2387 | goto ret; |
| 2388 | } |
| 2389 | #endif |
| 2390 | if (nonroot) { |
| 2391 | // fstab must have "users" or "user" |
| 2392 | l = parse_mount_options(mtcur->mnt_opts, NULL); |
| 2393 | if (!(l & MOUNT_USERS)) |
| 2394 | bb_error_msg_and_die("%s", bb_msg_you_must_be_root); |
| 2395 | } |
| 2396 | |
| 2397 | //util-linux-2.12 does not do this check. |
| 2398 | //// If nothing is mounted on this directory... |
| 2399 | //// (otherwise repeated "mount FOO" mounts FOO again) |
| 2400 | //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
| 2401 | //if (mp) { |
| 2402 | // bb_error_msg("according to %s, " |
| 2403 | // "%s is already mounted on %s", |
| 2404 | // bb_path_mtab_file, |
| 2405 | // mp->mnt_fsname, mp->mnt_dir); |
| 2406 | //} else { |
| 2407 | // ...mount the last thing we found |
| 2408 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| 2409 | append_mount_options(&(mtcur->mnt_opts), cmdopts); |
| 2410 | resolve_mount_spec(&mtpair->mnt_fsname); |
| 2411 | rc = singlemount(mtcur, /*ignore_busy:*/ 0); |
| 2412 | if (ENABLE_FEATURE_CLEAN_UP) |
| 2413 | free(mtcur->mnt_opts); |
| 2414 | //} |
| 2415 | } |
| 2416 | |
| 2417 | //ret: |
| 2418 | if (ENABLE_FEATURE_CLEAN_UP) |
| 2419 | endmntent(fstab); |
| 2420 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 2421 | free(storage_path); |
| 2422 | free(cmdopts); |
| 2423 | } |
| 2424 | |
| 2425 | //TODO: exitcode should be ORed mask of (from "man mount"): |
| 2426 | // 0 success |
| 2427 | // 1 incorrect invocation or permissions |
| 2428 | // 2 system error (out of memory, cannot fork, no more loop devices) |
| 2429 | // 4 internal mount bug or missing nfs support in mount |
| 2430 | // 8 user interrupt |
| 2431 | //16 problems writing or locking /etc/mtab |
| 2432 | //32 mount failure |
| 2433 | //64 some mount succeeded |
| 2434 | return rc; |
| 2435 | } |
| 2436 |