| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini mount implementation for busybox |
| * |
| * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| // Design notes: There is no spec for mount. Remind me to write one. |
| // |
| // mount_main() calls singlemount() which calls mount_it_now(). |
| // |
| // mount_main() can loop through /etc/fstab for mount -a |
| // singlemount() can loop through /etc/filesystems for fstype detection. |
| // mount_it_now() does the actual mount. |
| // |
| |
| //config:config MOUNT |
| //config: bool "mount" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: All files and filesystems in Unix are arranged into one big directory |
| //config: tree. The 'mount' utility is used to graft a filesystem onto a |
| //config: particular part of the tree. A filesystem can either live on a block |
| //config: device, or it can be accessible over the network, as is the case with |
| //config: NFS filesystems. Most people using BusyBox will also want to enable |
| //config: the 'mount' utility. |
| //config: |
| //config:config FEATURE_MOUNT_FAKE |
| //config: bool "Support option -f" |
| //config: default y |
| //config: depends on MOUNT |
| //config: help |
| //config: Enable support for faking a file system mount. |
| //config: |
| //config:config FEATURE_MOUNT_VERBOSE |
| //config: bool "Support option -v" |
| //config: default y |
| //config: depends on MOUNT |
| //config: help |
| //config: Enable multi-level -v[vv...] verbose messages. Useful if you |
| //config: debug mount problems and want to see what is exactly passed |
| //config: to the kernel. |
| //config: |
| //config:config FEATURE_MOUNT_HELPERS |
| //config: bool "Support mount helpers" |
| //config: default n |
| //config: depends on MOUNT |
| //config: help |
| //config: Enable mounting of virtual file systems via external helpers. |
| //config: E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call |
| //config: "obexfs -b00.11.22.33.44.55 /mnt" |
| //config: Also "mount -t sometype [-o opts] fs /mnt" will try |
| //config: "sometype [-o opts] fs /mnt" if simple mount syscall fails. |
| //config: The idea is to use such virtual filesystems in /etc/fstab. |
| //config: |
| //config:config FEATURE_MOUNT_LABEL |
| //config: bool "Support specifying devices by label or UUID" |
| //config: default y |
| //config: depends on MOUNT |
| //config: select VOLUMEID |
| //config: help |
| //config: This allows for specifying a device by label or uuid, rather than by |
| //config: name. This feature utilizes the same functionality as blkid/findfs. |
| //config: This also enables label or uuid support for swapon. |
| //config: |
| //config:config FEATURE_MOUNT_NFS |
| //config: bool "Support mounting NFS file systems on Linux < 2.6.23" |
| //config: default n |
| //config: depends on MOUNT |
| //config: select FEATURE_HAVE_RPC |
| //config: select FEATURE_SYSLOG |
| //config: help |
| //config: Enable mounting of NFS file systems on Linux kernels prior |
| //config: to version 2.6.23. Note that in this case mounting of NFS |
| //config: over IPv6 will not be possible. |
| //config: |
| //config: Note that this option links in RPC support from libc, |
| //config: which is rather large (~10 kbytes on uclibc). |
| //config: |
| //config:config FEATURE_MOUNT_CIFS |
| //config: bool "Support mounting CIFS/SMB file systems" |
| //config: default y |
| //config: depends on MOUNT |
| //config: help |
| //config: Enable support for samba mounts. |
| //config: |
| //config:config FEATURE_MOUNT_FLAGS |
| //config: depends on MOUNT |
| //config: bool "Support lots of -o flags in mount" |
| //config: default y |
| //config: help |
| //config: Without this, mount only supports ro/rw/remount. With this, it |
| //config: supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime, |
| //config: noatime, diratime, nodiratime, loud, bind, move, shared, slave, |
| //config: private, unbindable, rshared, rslave, rprivate, and runbindable. |
| //config: |
| //config:config FEATURE_MOUNT_FSTAB |
| //config: depends on MOUNT |
| //config: bool "Support /etc/fstab and -a" |
| //config: default y |
| //config: help |
| //config: Support mount all and looking for files in /etc/fstab. |
| //config: |
| //config:config FEATURE_MOUNT_OTHERTAB |
| //config: depends on FEATURE_MOUNT_FSTAB |
| //config: bool "Support -T <alt_fstab>" |
| //config: default y |
| //config: help |
| //config: Support mount -T (specifying an alternate fstab) |
| |
| //usage:#define mount_trivial_usage |
| //usage: "[OPTIONS] [-o OPT] DEVICE NODE" |
| //usage:#define mount_full_usage "\n\n" |
| //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n" |
| //usage: "\n -a Mount all filesystems in fstab" |
| //usage: IF_FEATURE_MOUNT_FAKE( |
| //usage: IF_FEATURE_MTAB_SUPPORT( |
| //usage: "\n -f Update /etc/mtab, but don't mount" |
| //usage: ) |
| //usage: IF_NOT_FEATURE_MTAB_SUPPORT( |
| //usage: "\n -f Dry run" |
| //usage: ) |
| //usage: ) |
| //usage: IF_FEATURE_MOUNT_HELPERS( |
| //usage: "\n -i Don't run mount helper" |
| //usage: ) |
| //usage: IF_FEATURE_MTAB_SUPPORT( |
| //usage: "\n -n Don't update /etc/mtab" |
| //usage: ) |
| //usage: IF_FEATURE_MOUNT_VERBOSE( |
| //usage: "\n -v Verbose" |
| //usage: ) |
| ////usage: "\n -s Sloppy (ignored)" |
| //usage: "\n -r Read-only mount" |
| ////usage: "\n -w Read-write mount (default)" |
| //usage: "\n -t FSTYPE[,...] Filesystem type(s)" |
| //usage: IF_FEATURE_MOUNT_OTHERTAB( |
| //usage: "\n -T FILE Read FILE instead of /etc/fstab" |
| //usage: ) |
| //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)" |
| //usage: "\n-o OPT:" |
| //usage: IF_FEATURE_MOUNT_LOOP( |
| //usage: "\n loop Ignored (loop devices are autodetected)" |
| //usage: ) |
| //usage: IF_FEATURE_MOUNT_FLAGS( |
| //usage: "\n [a]sync Writes are [a]synchronous" |
| //usage: "\n [no]atime Disable/enable updates to inode access times" |
| //usage: "\n [no]diratime Disable/enable atime updates to directories" |
| //usage: "\n [no]relatime Disable/enable atime updates relative to modification time" |
| //usage: "\n [no]dev (Dis)allow use of special device files" |
| //usage: "\n [no]exec (Dis)allow use of executable files" |
| //usage: "\n [no]suid (Dis)allow set-user-id-root programs" |
| //usage: "\n [r]shared Convert [recursively] to a shared subtree" |
| //usage: "\n [r]slave Convert [recursively] to a slave subtree" |
| //usage: "\n [r]private Convert [recursively] to a private subtree" |
| //usage: "\n [un]bindable Make mount point [un]able to be bind mounted" |
| //usage: "\n [r]bind Bind a file or directory [recursively] to another location" |
| //usage: "\n move Relocate an existing mount point" |
| //usage: ) |
| //usage: "\n remount Remount a mounted filesystem, changing flags" |
| //usage: "\n ro Same as -r" |
| //usage: "\n" |
| //usage: "\nThere are filesystem-specific -o flags." |
| //usage: |
| //usage:#define mount_example_usage |
| //usage: "$ mount\n" |
| //usage: "/dev/hda3 on / type minix (rw)\n" |
| //usage: "proc on /proc type proc (rw)\n" |
| //usage: "devpts on /dev/pts type devpts (rw)\n" |
| //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n" |
| //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n" |
| //usage: "$ mount cd_image.iso mydir\n" |
| //usage:#define mount_notes_usage |
| //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount." |
| |
| #include <mntent.h> |
| #include <syslog.h> |
| #include <sys/mount.h> |
| // Grab more as needed from util-linux's mount/mount_constants.h |
| #ifndef MS_DIRSYNC |
| # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous |
| #endif |
| #ifndef MS_UNION |
| # define MS_UNION (1 << 8) |
| #endif |
| #ifndef MS_BIND |
| # define MS_BIND (1 << 12) |
| #endif |
| #ifndef MS_MOVE |
| # define MS_MOVE (1 << 13) |
| #endif |
| #ifndef MS_RECURSIVE |
| # define MS_RECURSIVE (1 << 14) |
| #endif |
| #ifndef MS_SILENT |
| # define MS_SILENT (1 << 15) |
| #endif |
| // The shared subtree stuff, which went in around 2.6.15 |
| #ifndef MS_UNBINDABLE |
| # define MS_UNBINDABLE (1 << 17) |
| #endif |
| #ifndef MS_PRIVATE |
| # define MS_PRIVATE (1 << 18) |
| #endif |
| #ifndef MS_SLAVE |
| # define MS_SLAVE (1 << 19) |
| #endif |
| #ifndef MS_SHARED |
| # define MS_SHARED (1 << 20) |
| #endif |
| #ifndef MS_RELATIME |
| # define MS_RELATIME (1 << 21) |
| #endif |
| #ifndef MS_STRICTATIME |
| # define MS_STRICTATIME (1 << 24) |
| #endif |
| |
| /* Any ~MS_FOO value has this bit set: */ |
| #define BB_MS_INVERTED_VALUE (1u << 31) |
| |
| #include "libbb.h" |
| #include "common_bufsiz.h" |
| #if ENABLE_FEATURE_MOUNT_LABEL |
| # include "volume_id.h" |
| #else |
| # define resolve_mount_spec(fsname) ((void)0) |
| #endif |
| |
| // Needed for nfs support only |
| #include <sys/utsname.h> |
| #undef TRUE |
| #undef FALSE |
| #if ENABLE_FEATURE_MOUNT_NFS |
| /* This is just a warning of a common mistake. Possibly this should be a |
| * uclibc faq entry rather than in busybox... */ |
| # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
| # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support" |
| # endif |
| # include <rpc/rpc.h> |
| # include <rpc/pmap_prot.h> |
| # include <rpc/pmap_clnt.h> |
| #endif |
| |
| |
| #if defined(__dietlibc__) |
| // 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
| // dietlibc-0.30 does not have implementation of getmntent_r() |
| static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
| char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) |
| { |
| struct mntent* ment = getmntent(stream); |
| return memcpy(result, ment, sizeof(*ment)); |
| } |
| #endif |
| |
| |
| // Not real flags, but we want to be able to check for this. |
| enum { |
| MOUNT_USERS = (1 << 27) * ENABLE_DESKTOP, |
| MOUNT_NOFAIL = (1 << 28) * ENABLE_DESKTOP, |
| MOUNT_NOAUTO = (1 << 29), |
| MOUNT_SWAP = (1 << 30), |
| MOUNT_FAKEFLAGS = MOUNT_USERS | MOUNT_NOFAIL | MOUNT_NOAUTO | MOUNT_SWAP |
| }; |
| |
| |
| #define OPTION_STR "o:*t:rwanfvsiO:" IF_FEATURE_MOUNT_OTHERTAB("T:") |
| enum { |
| OPT_o = (1 << 0), |
| OPT_t = (1 << 1), |
| OPT_r = (1 << 2), |
| OPT_w = (1 << 3), |
| OPT_a = (1 << 4), |
| OPT_n = (1 << 5), |
| OPT_f = (1 << 6), |
| OPT_v = (1 << 7), |
| OPT_s = (1 << 8), |
| OPT_i = (1 << 9), |
| OPT_O = (1 << 10), |
| OPT_T = (1 << 11), |
| }; |
| |
| #if ENABLE_FEATURE_MTAB_SUPPORT |
| #define USE_MTAB (!(option_mask32 & OPT_n)) |
| #else |
| #define USE_MTAB 0 |
| #endif |
| |
| #if ENABLE_FEATURE_MOUNT_FAKE |
| #define FAKE_IT (option_mask32 & OPT_f) |
| #else |
| #define FAKE_IT 0 |
| #endif |
| |
| #if ENABLE_FEATURE_MOUNT_HELPERS |
| #define HELPERS_ALLOWED (!(option_mask32 & OPT_i)) |
| #else |
| #define HELPERS_ALLOWED 0 |
| #endif |
| |
| |
| // TODO: more "user" flag compatibility. |
| // "user" option (from mount manpage): |
| // Only the user that mounted a filesystem can unmount it again. |
| // If any user should be able to unmount, then use users instead of user |
| // in the fstab line. The owner option is similar to the user option, |
| // with the restriction that the user must be the owner of the special file. |
| // This may be useful e.g. for /dev/fd if a login script makes |
| // the console user owner of this device. |
| |
| // Standard mount options (from -o options or --options), |
| // with corresponding flags |
| static const int32_t mount_options[] = { |
| // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
| |
| IF_FEATURE_MOUNT_LOOP( |
| /* "loop" */ 0, |
| ) |
| |
| IF_FEATURE_MOUNT_FSTAB( |
| /* "defaults" */ 0, |
| /* "quiet" 0 - do not filter out, vfat wants to see it */ |
| /* "noauto" */ MOUNT_NOAUTO, |
| /* "sw" */ MOUNT_SWAP, |
| /* "swap" */ MOUNT_SWAP, |
| IF_DESKTOP(/* "user" */ MOUNT_USERS,) |
| IF_DESKTOP(/* "users" */ MOUNT_USERS,) |
| IF_DESKTOP(/* "nofail" */ MOUNT_NOFAIL,) |
| /* "_netdev" */ 0, |
| IF_DESKTOP(/* "comment=" */ 0,) /* systemd uses this in fstab */ |
| ) |
| |
| IF_FEATURE_MOUNT_FLAGS( |
| // vfs flags |
| /* "nosuid" */ MS_NOSUID, |
| /* "suid" */ ~MS_NOSUID, |
| /* "dev" */ ~MS_NODEV, |
| /* "nodev" */ MS_NODEV, |
| /* "exec" */ ~MS_NOEXEC, |
| /* "noexec" */ MS_NOEXEC, |
| /* "sync" */ MS_SYNCHRONOUS, |
| /* "dirsync" */ MS_DIRSYNC, |
| /* "async" */ ~MS_SYNCHRONOUS, |
| /* "atime" */ ~MS_NOATIME, |
| /* "noatime" */ MS_NOATIME, |
| /* "diratime" */ ~MS_NODIRATIME, |
| /* "nodiratime" */ MS_NODIRATIME, |
| /* "mand" */ MS_MANDLOCK, |
| /* "nomand" */ ~MS_MANDLOCK, |
| /* "relatime" */ MS_RELATIME, |
| /* "norelatime" */ ~MS_RELATIME, |
| /* "strictatime" */ MS_STRICTATIME, |
| /* "loud" */ ~MS_SILENT, |
| /* "rbind" */ MS_BIND|MS_RECURSIVE, |
| |
| // action flags |
| /* "union" */ MS_UNION, |
| /* "bind" */ MS_BIND, |
| /* "move" */ MS_MOVE, |
| /* "shared" */ MS_SHARED, |
| /* "slave" */ MS_SLAVE, |
| /* "private" */ MS_PRIVATE, |
| /* "unbindable" */ MS_UNBINDABLE, |
| /* "rshared" */ MS_SHARED|MS_RECURSIVE, |
| /* "rslave" */ MS_SLAVE|MS_RECURSIVE, |
| /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE, |
| /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE, |
| ) |
| |
| // Always understood. |
| /* "ro" */ MS_RDONLY, // vfs flag |
| /* "rw" */ ~MS_RDONLY, // vfs flag |
| /* "remount" */ MS_REMOUNT // action flag |
| }; |
| |
| static const char mount_option_str[] ALIGN1 = |
| IF_FEATURE_MOUNT_LOOP( |
| "loop\0" |
| ) |
| IF_FEATURE_MOUNT_FSTAB( |
| "defaults\0" |
| // "quiet\0" - do not filter out, vfat wants to see it |
| "noauto\0" |
| "sw\0" |
| "swap\0" |
| IF_DESKTOP("user\0") |
| IF_DESKTOP("users\0") |
| IF_DESKTOP("nofail\0") |
| "_netdev\0" |
| IF_DESKTOP("comment=\0") /* systemd uses this in fstab */ |
| ) |
| IF_FEATURE_MOUNT_FLAGS( |
| // vfs flags |
| "nosuid\0" |
| "suid\0" |
| "dev\0" |
| "nodev\0" |
| "exec\0" |
| "noexec\0" |
| "sync\0" |
| "dirsync\0" |
| "async\0" |
| "atime\0" |
| "noatime\0" |
| "diratime\0" |
| "nodiratime\0" |
| "mand\0" |
| "nomand\0" |
| "relatime\0" |
| "norelatime\0" |
| "strictatime\0" |
| "loud\0" |
| "rbind\0" |
| |
| // action flags |
| "union\0" |
| "bind\0" |
| "move\0" |
| "make-shared\0" |
| "make-slave\0" |
| "make-private\0" |
| "make-unbindable\0" |
| "make-rshared\0" |
| "make-rslave\0" |
| "make-rprivate\0" |
| "make-runbindable\0" |
| ) |
| |
| // Always understood. |
| "ro\0" // vfs flag |
| "rw\0" // vfs flag |
| "remount\0" // action flag |
| ; |
| |
| |
| struct globals { |
| #if ENABLE_FEATURE_MOUNT_NFS |
| smalluint nfs_mount_version; |
| #endif |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| unsigned verbose; |
| #endif |
| llist_t *fslist; |
| char getmntent_buf[1]; |
| } FIX_ALIASING; |
| enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) }; |
| #define G (*(struct globals*)bb_common_bufsiz1) |
| #define nfs_mount_version (G.nfs_mount_version) |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| #define verbose (G.verbose ) |
| #else |
| #define verbose 0 |
| #endif |
| #define fslist (G.fslist ) |
| #define getmntent_buf (G.getmntent_buf ) |
| #define INIT_G() do { setup_common_bufsiz(); } while (0) |
| |
| #if ENABLE_FEATURE_MTAB_SUPPORT |
| /* |
| * update_mtab_entry_on_move() is used to update entry in case of mount --move. |
| * we are looking for existing entries mnt_dir which is equal to mnt_fsname of |
| * input mntent and replace it by new one. |
| */ |
| static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp) |
| { |
| struct mntent *entries, *m; |
| int i, count; |
| FILE *mountTable; |
| |
| mountTable = setmntent(bb_path_mtab_file, "r"); |
| if (!mountTable) { |
| bb_perror_msg(bb_path_mtab_file); |
| return; |
| } |
| |
| entries = NULL; |
| count = 0; |
| while ((m = getmntent(mountTable)) != NULL) { |
| entries = xrealloc_vector(entries, 3, count); |
| entries[count].mnt_fsname = xstrdup(m->mnt_fsname); |
| entries[count].mnt_dir = xstrdup(m->mnt_dir); |
| entries[count].mnt_type = xstrdup(m->mnt_type); |
| entries[count].mnt_opts = xstrdup(m->mnt_opts); |
| entries[count].mnt_freq = m->mnt_freq; |
| entries[count].mnt_passno = m->mnt_passno; |
| count++; |
| } |
| endmntent(mountTable); |
| |
| mountTable = setmntent(bb_path_mtab_file, "w"); |
| if (mountTable) { |
| for (i = 0; i < count; i++) { |
| if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0) |
| addmntent(mountTable, &entries[i]); |
| else |
| addmntent(mountTable, mp); |
| } |
| endmntent(mountTable); |
| } else if (errno != EROFS) |
| bb_perror_msg(bb_path_mtab_file); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| for (i = 0; i < count; i++) { |
| free(entries[i].mnt_fsname); |
| free(entries[i].mnt_dir); |
| free(entries[i].mnt_type); |
| free(entries[i].mnt_opts); |
| } |
| free(entries); |
| } |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| static int verbose_mount(const char *source, const char *target, |
| const char *filesystemtype, |
| unsigned long mountflags, const void *data) |
| { |
| int rc; |
| |
| errno = 0; |
| rc = mount(source, target, filesystemtype, mountflags, data); |
| if (verbose >= 2) |
| bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d", |
| source, target, filesystemtype, |
| mountflags, (char*)data, rc); |
| return rc; |
| } |
| #else |
| #define verbose_mount(...) mount(__VA_ARGS__) |
| #endif |
| |
| // Append mount options to string |
| static void append_mount_options(char **oldopts, const char *newopts) |
| { |
| if (*oldopts && **oldopts) { |
| // Do not insert options which are already there |
| while (newopts[0]) { |
| char *p; |
| int len = strlen(newopts); |
| p = strchr(newopts, ','); |
| if (p) len = p - newopts; |
| p = *oldopts; |
| while (1) { |
| if (!strncmp(p, newopts, len) |
| && (p[len] == ',' || p[len] == '\0')) |
| goto skip; |
| p = strchr(p,','); |
| if (!p) break; |
| p++; |
| } |
| p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
| free(*oldopts); |
| *oldopts = p; |
| skip: |
| newopts += len; |
| while (newopts[0] == ',') newopts++; |
| } |
| } else { |
| if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
| *oldopts = xstrdup(newopts); |
| } |
| } |
| |
| // Use the mount_options list to parse options into flags. |
| // Also update list of unrecognized options if unrecognized != NULL |
| static unsigned long parse_mount_options(char *options, char **unrecognized) |
| { |
| unsigned long flags = MS_SILENT; |
| |
| // Loop through options |
| for (;;) { |
| unsigned i; |
| char *comma = strchr(options, ','); |
| const char *option_str = mount_option_str; |
| |
| if (comma) *comma = '\0'; |
| |
| // FIXME: use hasmntopt() |
| // Find this option in mount_options |
| for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
| unsigned opt_len = strlen(option_str); |
| |
| if (strncasecmp(option_str, options, opt_len) == 0 |
| && (options[opt_len] == '\0' |
| /* or is it "comment=" thingy in fstab? */ |
| IF_FEATURE_MOUNT_FSTAB(IF_DESKTOP( || option_str[opt_len-1] == '=' )) |
| ) |
| ) { |
| unsigned long fl = mount_options[i]; |
| if (fl & BB_MS_INVERTED_VALUE) |
| flags &= fl; |
| else |
| flags |= fl; |
| goto found; |
| } |
| option_str += opt_len + 1; |
| } |
| // We did not recognize this option. |
| // If "unrecognized" is not NULL, append option there. |
| // Note that we should not append *empty* option - |
| // in this case we want to pass NULL, not "", to "data" |
| // parameter of mount(2) syscall. |
| // This is crucial for filesystems that don't accept |
| // any arbitrary mount options, like cgroup fs: |
| // "mount -t cgroup none /mnt" |
| if (options[0] && unrecognized) { |
| // Add it to strflags, to pass on to kernel |
| char *p = *unrecognized; |
| unsigned len = p ? strlen(p) : 0; |
| *unrecognized = p = xrealloc(p, len + strlen(options) + 2); |
| |
| // Comma separated if it's not the first one |
| if (len) p[len++] = ','; |
| strcpy(p + len, options); |
| } |
| found: |
| if (!comma) |
| break; |
| // Advance to next option |
| *comma = ','; |
| options = ++comma; |
| } |
| |
| return flags; |
| } |
| |
| // Return a list of all block device backed filesystems |
| static llist_t *get_block_backed_filesystems(void) |
| { |
| static const char filesystems[2][sizeof("/proc/filesystems")] = { |
| "/etc/filesystems", |
| "/proc/filesystems", |
| }; |
| char *fs, *buf; |
| llist_t *list = NULL; |
| int i; |
| FILE *f; |
| |
| for (i = 0; i < 2; i++) { |
| f = fopen_for_read(filesystems[i]); |
| if (!f) continue; |
| |
| while ((buf = xmalloc_fgetline(f)) != NULL) { |
| if (is_prefixed_with(buf, "nodev") && isspace(buf[5])) |
| goto next; |
| fs = skip_whitespace(buf); |
| if (*fs == '#' || *fs == '*' || !*fs) |
| goto next; |
| |
| llist_add_to_end(&list, xstrdup(fs)); |
| next: |
| free(buf); |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
| } |
| |
| return list; |
| } |
| |
| #if ENABLE_FEATURE_CLEAN_UP |
| static void delete_block_backed_filesystems(void) |
| { |
| llist_free(fslist, free); |
| } |
| #else |
| void delete_block_backed_filesystems(void); |
| #endif |
| |
| // Perform actual mount of specific filesystem at specific location. |
| // NB: mp->xxx fields may be trashed on exit |
| static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| { |
| int rc = 0; |
| |
| vfsflags &= ~(unsigned long)MOUNT_FAKEFLAGS; |
| |
| if (FAKE_IT) { |
| if (verbose >= 2) |
| bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')", |
| mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| vfsflags, filteropts); |
| goto mtab; |
| } |
| |
| // Mount, with fallback to read-only if necessary. |
| for (;;) { |
| errno = 0; |
| rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| vfsflags, filteropts); |
| |
| // If mount failed, try |
| // helper program mount.<mnt_type> |
| if (HELPERS_ALLOWED && rc && mp->mnt_type) { |
| char *args[8]; |
| int errno_save = errno; |
| args[0] = xasprintf("mount.%s", mp->mnt_type); |
| rc = 1; |
| if (FAKE_IT) |
| args[rc++] = (char *)"-f"; |
| if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB) |
| args[rc++] = (char *)"-n"; |
| args[rc++] = mp->mnt_fsname; |
| args[rc++] = mp->mnt_dir; |
| if (filteropts) { |
| args[rc++] = (char *)"-o"; |
| args[rc++] = filteropts; |
| } |
| args[rc] = NULL; |
| rc = spawn_and_wait(args); |
| free(args[0]); |
| if (!rc) |
| break; |
| errno = errno_save; |
| } |
| |
| if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS)) |
| break; |
| if (!(vfsflags & MS_SILENT)) |
| bb_error_msg("%s is write-protected, mounting read-only", |
| mp->mnt_fsname); |
| vfsflags |= MS_RDONLY; |
| } |
| |
| // Abort entirely if permission denied. |
| |
| if (rc && errno == EPERM) |
| bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
| |
| // If the mount was successful, and we're maintaining an old-style |
| // mtab file by hand, add the new entry to it now. |
| mtab: |
| if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) { |
| char *fsname; |
| FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
| const char *option_str = mount_option_str; |
| int i; |
| |
| if (!mountTable) { |
| bb_perror_msg(bb_path_mtab_file); |
| goto ret; |
| } |
| |
| // Add vfs string flags |
| for (i = 0; mount_options[i] != MS_REMOUNT; i++) { |
| if (mount_options[i] > 0 && (mount_options[i] & vfsflags)) |
| append_mount_options(&(mp->mnt_opts), option_str); |
| option_str += strlen(option_str) + 1; |
| } |
| |
| // Remove trailing / (if any) from directory we mounted on |
| i = strlen(mp->mnt_dir) - 1; |
| while (i > 0 && mp->mnt_dir[i] == '/') |
| mp->mnt_dir[i--] = '\0'; |
| |
| // Convert to canonical pathnames as needed |
| mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
| fsname = NULL; |
| if (!mp->mnt_type || !*mp->mnt_type) { // bind mount |
| mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
| mp->mnt_type = (char*)"bind"; |
| } |
| mp->mnt_freq = mp->mnt_passno = 0; |
| |
| // Write and close |
| #if ENABLE_FEATURE_MTAB_SUPPORT |
| if (vfsflags & MS_MOVE) |
| update_mtab_entry_on_move(mp); |
| else |
| #endif |
| addmntent(mountTable, mp); |
| endmntent(mountTable); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(mp->mnt_dir); |
| free(fsname); |
| } |
| } |
| ret: |
| return rc; |
| } |
| |
| #if ENABLE_FEATURE_MOUNT_NFS |
| |
| /* |
| * Linux NFS mount |
| * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| * |
| * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
| * numbers to be specified on the command line. |
| * |
| * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
| * Omit the call to connect() for Linux version 1.3.11 or later. |
| * |
| * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
| * Implemented the "bg", "fg" and "retry" mount options for NFS. |
| * |
| * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
| * - added Native Language Support |
| * |
| * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
| * plus NFSv3 stuff. |
| */ |
| |
| #define MOUNTPORT 635 |
| #define MNTPATHLEN 1024 |
| #define MNTNAMLEN 255 |
| #define FHSIZE 32 |
| #define FHSIZE3 64 |
| |
| typedef char fhandle[FHSIZE]; |
| |
| typedef struct { |
| unsigned int fhandle3_len; |
| char *fhandle3_val; |
| } fhandle3; |
| |
| enum mountstat3 { |
| MNT_OK = 0, |
| MNT3ERR_PERM = 1, |
| MNT3ERR_NOENT = 2, |
| MNT3ERR_IO = 5, |
| MNT3ERR_ACCES = 13, |
| MNT3ERR_NOTDIR = 20, |
| MNT3ERR_INVAL = 22, |
| MNT3ERR_NAMETOOLONG = 63, |
| MNT3ERR_NOTSUPP = 10004, |
| MNT3ERR_SERVERFAULT = 10006, |
| }; |
| typedef enum mountstat3 mountstat3; |
| |
| struct fhstatus { |
| unsigned int fhs_status; |
| union { |
| fhandle fhs_fhandle; |
| } fhstatus_u; |
| }; |
| typedef struct fhstatus fhstatus; |
| |
| struct mountres3_ok { |
| fhandle3 fhandle; |
| struct { |
| unsigned int auth_flavours_len; |
| char *auth_flavours_val; |
| } auth_flavours; |
| }; |
| typedef struct mountres3_ok mountres3_ok; |
| |
| struct mountres3 { |
| mountstat3 fhs_status; |
| union { |
| mountres3_ok mountinfo; |
| } mountres3_u; |
| }; |
| typedef struct mountres3 mountres3; |
| |
| typedef char *dirpath; |
| |
| typedef char *name; |
| |
| typedef struct mountbody *mountlist; |
| |
| struct mountbody { |
| name ml_hostname; |
| dirpath ml_directory; |
| mountlist ml_next; |
| }; |
| typedef struct mountbody mountbody; |
| |
| typedef struct groupnode *groups; |
| |
| struct groupnode { |
| name gr_name; |
| groups gr_next; |
| }; |
| typedef struct groupnode groupnode; |
| |
| typedef struct exportnode *exports; |
| |
| struct exportnode { |
| dirpath ex_dir; |
| groups ex_groups; |
| exports ex_next; |
| }; |
| typedef struct exportnode exportnode; |
| |
| struct ppathcnf { |
| int pc_link_max; |
| short pc_max_canon; |
| short pc_max_input; |
| short pc_name_max; |
| short pc_path_max; |
| short pc_pipe_buf; |
| uint8_t pc_vdisable; |
| char pc_xxx; |
| short pc_mask[2]; |
| }; |
| typedef struct ppathcnf ppathcnf; |
| |
| #define MOUNTPROG 100005 |
| #define MOUNTVERS 1 |
| |
| #define MOUNTPROC_NULL 0 |
| #define MOUNTPROC_MNT 1 |
| #define MOUNTPROC_DUMP 2 |
| #define MOUNTPROC_UMNT 3 |
| #define MOUNTPROC_UMNTALL 4 |
| #define MOUNTPROC_EXPORT 5 |
| #define MOUNTPROC_EXPORTALL 6 |
| |
| #define MOUNTVERS_POSIX 2 |
| |
| #define MOUNTPROC_PATHCONF 7 |
| |
| #define MOUNT_V3 3 |
| |
| #define MOUNTPROC3_NULL 0 |
| #define MOUNTPROC3_MNT 1 |
| #define MOUNTPROC3_DUMP 2 |
| #define MOUNTPROC3_UMNT 3 |
| #define MOUNTPROC3_UMNTALL 4 |
| #define MOUNTPROC3_EXPORT 5 |
| |
| enum { |
| #ifndef NFS_FHSIZE |
| NFS_FHSIZE = 32, |
| #endif |
| #ifndef NFS_PORT |
| NFS_PORT = 2049 |
| #endif |
| }; |
| |
| /* |
| * We want to be able to compile mount on old kernels in such a way |
| * that the binary will work well on more recent kernels. |
| * Thus, if necessary we teach nfsmount.c the structure of new fields |
| * that will come later. |
| * |
| * Moreover, the new kernel includes conflict with glibc includes |
| * so it is easiest to ignore the kernel altogether (at compile time). |
| */ |
| |
| struct nfs2_fh { |
| char data[32]; |
| }; |
| struct nfs3_fh { |
| unsigned short size; |
| unsigned char data[64]; |
| }; |
| |
| struct nfs_mount_data { |
| int version; /* 1 */ |
| int fd; /* 1 */ |
| struct nfs2_fh old_root; /* 1 */ |
| int flags; /* 1 */ |
| int rsize; /* 1 */ |
| int wsize; /* 1 */ |
| int timeo; /* 1 */ |
| int retrans; /* 1 */ |
| int acregmin; /* 1 */ |
| int acregmax; /* 1 */ |
| int acdirmin; /* 1 */ |
| int acdirmax; /* 1 */ |
| struct sockaddr_in addr; /* 1 */ |
| char hostname[256]; /* 1 */ |
| int namlen; /* 2 */ |
| unsigned int bsize; /* 3 */ |
| struct nfs3_fh root; /* 4 */ |
| }; |
| |
| /* bits in the flags field */ |
| enum { |
| NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
| NFS_MOUNT_INTR = 0x0002, /* 1 */ |
| NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
| NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
| NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
| NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
| NFS_MOUNT_TCP = 0x0040, /* 2 */ |
| NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
| NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
| NFS_MOUNT_NONLM = 0x0200, /* 3 */ |
| NFS_MOUNT_NOACL = 0x0800, /* 4 */ |
| NFS_MOUNT_NORDIRPLUS = 0x4000 |
| }; |
| |
| |
| /* |
| * We need to translate between nfs status return values and |
| * the local errno values which may not be the same. |
| * |
| * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
| * "after #include <errno.h> the symbol errno is reserved for any use, |
| * it cannot even be used as a struct tag or field name". |
| */ |
| #ifndef EDQUOT |
| # define EDQUOT ENOSPC |
| #endif |
| /* Convert each NFSERR_BLAH into EBLAH */ |
| static const uint8_t nfs_err_stat[] ALIGN1 = { |
| 1, 2, 5, 6, 13, 17, |
| 19, 20, 21, 22, 27, 28, |
| 30, 63, 66, 69, 70, 71 |
| }; |
| #if ( \ |
| EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \ |
| ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \ |
| EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256 |
| typedef uint8_t nfs_err_type; |
| #else |
| typedef uint16_t nfs_err_type; |
| #endif |
| static const nfs_err_type nfs_err_errnum[] ALIGN2 = { |
| EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST, |
| ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC, |
| EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE |
| }; |
| static char *nfs_strerror(int status) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) { |
| if (nfs_err_stat[i] == status) |
| return strerror(nfs_err_errnum[i]); |
| } |
| return xasprintf("unknown nfs status return value: %d", status); |
| } |
| |
| static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
| { |
| return xdr_opaque(xdrs, objp, FHSIZE); |
| } |
| |
| static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
| { |
| if (!xdr_u_int(xdrs, &objp->fhs_status)) |
| return FALSE; |
| if (objp->fhs_status == 0) |
| return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle); |
| return TRUE; |
| } |
| |
| static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
| { |
| return xdr_string(xdrs, objp, MNTPATHLEN); |
| } |
| |
| static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
| { |
| return xdr_bytes(xdrs, (char **)&objp->fhandle3_val, |
| (unsigned int *) &objp->fhandle3_len, |
| FHSIZE3); |
| } |
| |
| static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
| { |
| if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
| return FALSE; |
| return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), |
| &(objp->auth_flavours.auth_flavours_len), |
| ~0, |
| sizeof(int), |
| (xdrproc_t) xdr_int); |
| } |
| |
| static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
| { |
| return xdr_enum(xdrs, (enum_t *) objp); |
| } |
| |
| static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
| { |
| if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
| return FALSE; |
| if (objp->fhs_status == MNT_OK) |
| return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo); |
| return TRUE; |
| } |
| |
| #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
| |
| /* |
| * Unfortunately, the kernel prints annoying console messages |
| * in case of an unexpected nfs mount version (instead of |
| * just returning some error). Therefore we'll have to try |
| * and figure out what version the kernel expects. |
| * |
| * Variables: |
| * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
| * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
| * nfs_mount_version: version this source and running kernel can handle |
| */ |
| static void |
| find_kernel_nfs_mount_version(void) |
| { |
| int kernel_version; |
| |
| if (nfs_mount_version) |
| return; |
| |
| nfs_mount_version = 4; /* default */ |
| |
| kernel_version = get_linux_version_code(); |
| if (kernel_version) { |
| if (kernel_version < KERNEL_VERSION(2,2,18)) |
| nfs_mount_version = 3; |
| /* else v4 since 2.3.99pre4 */ |
| } |
| } |
| |
| static void |
| get_mountport(struct pmap *pm_mnt, |
| struct sockaddr_in *server_addr, |
| long unsigned prog, |
| long unsigned version, |
| long unsigned proto, |
| long unsigned port) |
| { |
| struct pmaplist *pmap; |
| |
| server_addr->sin_port = PMAPPORT; |
| /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
| * I understand it like "IPv6 for this is not 100% ready" */ |
| pmap = pmap_getmaps(server_addr); |
| |
| if (version > MAX_NFSPROT) |
| version = MAX_NFSPROT; |
| if (!prog) |
| prog = MOUNTPROG; |
| pm_mnt->pm_prog = prog; |
| pm_mnt->pm_vers = version; |
| pm_mnt->pm_prot = proto; |
| pm_mnt->pm_port = port; |
| |
| while (pmap) { |
| if (pmap->pml_map.pm_prog != prog) |
| goto next; |
| if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
| goto next; |
| if (version > 2 && pmap->pml_map.pm_vers != version) |
| goto next; |
| if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
| goto next; |
| if (pmap->pml_map.pm_vers > MAX_NFSPROT |
| || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) |
| || (port && pmap->pml_map.pm_port != port) |
| ) { |
| goto next; |
| } |
| memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
| next: |
| pmap = pmap->pml_next; |
| } |
| if (!pm_mnt->pm_vers) |
| pm_mnt->pm_vers = MOUNTVERS; |
| if (!pm_mnt->pm_port) |
| pm_mnt->pm_port = MOUNTPORT; |
| if (!pm_mnt->pm_prot) |
| pm_mnt->pm_prot = IPPROTO_TCP; |
| } |
| |
| #if BB_MMU |
| static int daemonize(void) |
| { |
| int pid = fork(); |
| if (pid < 0) /* error */ |
| return -errno; |
| if (pid > 0) /* parent */ |
| return 0; |
| /* child */ |
| close(0); |
| xopen(bb_dev_null, O_RDWR); |
| xdup2(0, 1); |
| xdup2(0, 2); |
| setsid(); |
| openlog(applet_name, LOG_PID, LOG_DAEMON); |
| logmode = LOGMODE_SYSLOG; |
| return 1; |
| } |
| #else |
| static inline int daemonize(void) { return -ENOSYS; } |
| #endif |
| |
| /* TODO */ |
| static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) |
| { |
| return 0; |
| } |
| |
| /* RPC strerror analogs are terminally idiotic: |
| * *mandatory* prefix and \n at end. |
| * This hopefully helps. Usage: |
| * error_msg_rpc(clnt_*error*(" ")) */ |
| static void error_msg_rpc(const char *msg) |
| { |
| int len; |
| while (msg[0] == ' ' || msg[0] == ':') msg++; |
| len = strlen(msg); |
| while (len && msg[len-1] == '\n') len--; |
| bb_error_msg("%.*s", len, msg); |
| } |
| |
| /* NB: mp->xxx fields may be trashed on exit */ |
| static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| { |
| CLIENT *mclient; |
| char *hostname; |
| char *pathname; |
| char *mounthost; |
| /* prior to 2.6.23, kernel took NFS options in a form of this struct |
| * only. 2.6.23+ looks at data->version, and if it's not 1..6, |
| * then data pointer is interpreted as a string. */ |
| struct nfs_mount_data data; |
| char *opt; |
| struct hostent *hp; |
| struct sockaddr_in server_addr; |
| struct sockaddr_in mount_server_addr; |
| int msock, fsock; |
| union { |
| struct fhstatus nfsv2; |
| struct mountres3 nfsv3; |
| } status; |
| int daemonized; |
| char *s; |
| int port; |
| int mountport; |
| int proto; |
| #if BB_MMU |
| smallint bg = 0; |
| #else |
| enum { bg = 0 }; |
| #endif |
| int retry; |
| int mountprog; |
| int mountvers; |
| int nfsprog; |
| int nfsvers; |
| int retval; |
| /* these all are one-bit really. gcc 4.3.1 likes this combination: */ |
| smallint tcp; |
| smallint soft; |
| int intr; |
| int posix; |
| int nocto; |
| int noac; |
| int nordirplus; |
| int nolock; |
| int noacl; |
| |
| find_kernel_nfs_mount_version(); |
| |
| daemonized = 0; |
| mounthost = NULL; |
| retval = ETIMEDOUT; |
| msock = fsock = -1; |
| mclient = NULL; |
| |
| /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
| |
| filteropts = xstrdup(filteropts); /* going to trash it later... */ |
| |
| hostname = xstrdup(mp->mnt_fsname); |
| /* mount_main() guarantees that ':' is there */ |
| s = strchr(hostname, ':'); |
| pathname = s + 1; |
| *s = '\0'; |
| /* Ignore all but first hostname in replicated mounts |
| * until they can be fully supported. (mack@sgi.com) */ |
| s = strchr(hostname, ','); |
| if (s) { |
| *s = '\0'; |
| bb_error_msg("warning: multiple hostnames not supported"); |
| } |
| |
| server_addr.sin_family = AF_INET; |
| if (!inet_aton(hostname, &server_addr.sin_addr)) { |
| hp = gethostbyname(hostname); |
| if (hp == NULL) { |
| bb_herror_msg("%s", hostname); |
| goto fail; |
| } |
| if (hp->h_length != (int)sizeof(struct in_addr)) { |
| bb_error_msg_and_die("only IPv4 is supported"); |
| } |
| memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); |
| } |
| |
| memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
| |
| /* add IP address to mtab options for use when unmounting */ |
| |
| if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
| mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
| } else { |
| char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
| mp->mnt_opts[0] ? "," : "", |
| inet_ntoa(server_addr.sin_addr)); |
| free(mp->mnt_opts); |
| mp->mnt_opts = tmp; |
| } |
| |
| /* Set default options. |
| * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
| * let the kernel decide. |
| * timeo is filled in after we know whether it'll be TCP or UDP. */ |
| memset(&data, 0, sizeof(data)); |
| data.retrans = 3; |
| data.acregmin = 3; |
| data.acregmax = 60; |
| data.acdirmin = 30; |
| data.acdirmax = 60; |
| data.namlen = NAME_MAX; |
| |
| soft = 0; |
| intr = 0; |
| posix = 0; |
| nocto = 0; |
| nolock = 0; |
| noac = 0; |
| nordirplus = 0; |
| noacl = 0; |
| retry = 10000; /* 10000 minutes ~ 1 week */ |
| tcp = 1; /* nfs-utils uses tcp per default */ |
| |
| mountprog = MOUNTPROG; |
| mountvers = 0; |
| port = 0; |
| mountport = 0; |
| nfsprog = 100003; |
| nfsvers = 0; |
| |
| /* parse options */ |
| if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
| char *opteq = strchr(opt, '='); |
| if (opteq) { |
| int val, idx; |
| static const char options[] ALIGN1 = |
| /* 0 */ "rsize\0" |
| /* 1 */ "wsize\0" |
| /* 2 */ "timeo\0" |
| /* 3 */ "retrans\0" |
| /* 4 */ "acregmin\0" |
| /* 5 */ "acregmax\0" |
| /* 6 */ "acdirmin\0" |
| /* 7 */ "acdirmax\0" |
| /* 8 */ "actimeo\0" |
| /* 9 */ "retry\0" |
| /* 10 */ "port\0" |
| /* 11 */ "mountport\0" |
| /* 12 */ "mounthost\0" |
| /* 13 */ "mountprog\0" |
| /* 14 */ "mountvers\0" |
| /* 15 */ "nfsprog\0" |
| /* 16 */ "nfsvers\0" |
| /* 17 */ "vers\0" |
| /* 18 */ "proto\0" |
| /* 19 */ "namlen\0" |
| /* 20 */ "addr\0"; |
| |
| *opteq++ = '\0'; |
| idx = index_in_strings(options, opt); |
| switch (idx) { |
| case 12: // "mounthost" |
| mounthost = xstrndup(opteq, |
| strcspn(opteq, " \t\n\r,")); |
| continue; |
| case 18: // "proto" |
| if (is_prefixed_with(opteq, "tcp")) |
| tcp = 1; |
| else if (is_prefixed_with(opteq, "udp")) |
| tcp = 0; |
| else |
| bb_error_msg("warning: unrecognized proto= option"); |
| continue; |
| case 20: // "addr" - ignore |
| continue; |
| case -1: // unknown |
| if (vfsflags & MS_REMOUNT) |
| continue; |
| } |
| |
| val = xatoi_positive(opteq); |
| switch (idx) { |
| case 0: // "rsize" |
| data.rsize = val; |
| continue; |
| case 1: // "wsize" |
| data.wsize = val; |
| continue; |
| case 2: // "timeo" |
| data.timeo = val; |
| continue; |
| case 3: // "retrans" |
| data.retrans = val; |
| continue; |
| case 4: // "acregmin" |
| data.acregmin = val; |
| continue; |
| case 5: // "acregmax" |
| data.acregmax = val; |
| continue; |
| case 6: // "acdirmin" |
| data.acdirmin = val; |
| continue; |
| case 7: // "acdirmax" |
| data.acdirmax = val; |
| continue; |
| case 8: // "actimeo" |
| data.acregmin = val; |
| data.acregmax = val; |
| data.acdirmin = val; |
| data.acdirmax = val; |
| continue; |
| case 9: // "retry" |
| retry = val; |
| continue; |
| case 10: // "port" |
| port = val; |
| continue; |
| case 11: // "mountport" |
| mountport = val; |
| continue; |
| case 13: // "mountprog" |
| mountprog = val; |
| continue; |
| case 14: // "mountvers" |
| mountvers = val; |
| continue; |
| case 15: // "nfsprog" |
| nfsprog = val; |
| continue; |
| case 16: // "nfsvers" |
| case 17: // "vers" |
| nfsvers = val; |
| continue; |
| case 19: // "namlen" |
| //if (nfs_mount_version >= 2) |
| data.namlen = val; |
| //else |
| // bb_error_msg("warning: option namlen is not supported\n"); |
| continue; |
| default: |
| bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
| goto fail; |
| } |
| } |
| else { /* not of the form opt=val */ |
| static const char options[] ALIGN1 = |
| "bg\0" |
| "fg\0" |
| "soft\0" |
| "hard\0" |
| "intr\0" |
| "posix\0" |
| "cto\0" |
| "ac\0" |
| "tcp\0" |
| "udp\0" |
| "lock\0" |
| "rdirplus\0" |
| "acl\0"; |
| int val = 1; |
| if (is_prefixed_with(opt, "no")) { |
| val = 0; |
| opt += 2; |
| } |
| switch (index_in_strings(options, opt)) { |
| case 0: // "bg" |
| #if BB_MMU |
| bg = val; |
| #endif |
| break; |
| case 1: // "fg" |
| #if BB_MMU |
| bg = !val; |
| #endif |
| break; |
| case 2: // "soft" |
| soft = val; |
| break; |
| case 3: // "hard" |
| soft = !val; |
| break; |
| case 4: // "intr" |
| intr = val; |
| break; |
| case 5: // "posix" |
| posix = val; |
| break; |
| case 6: // "cto" |
| nocto = !val; |
| break; |
| case 7: // "ac" |
| noac = !val; |
| break; |
| case 8: // "tcp" |
| tcp = val; |
| break; |
| case 9: // "udp" |
| tcp = !val; |
| break; |
| case 10: // "lock" |
| if (nfs_mount_version >= 3) |
| nolock = !val; |
| else |
| bb_error_msg("warning: option nolock is not supported"); |
| break; |
| case 11: //rdirplus |
| nordirplus = !val; |
| break; |
| case 12: // acl |
| noacl = !val; |
| break; |
| default: |
| bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
| goto fail; |
| } |
| } |
| } |
| proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
| |
| data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
| | (intr ? NFS_MOUNT_INTR : 0) |
| | (posix ? NFS_MOUNT_POSIX : 0) |
| | (nocto ? NFS_MOUNT_NOCTO : 0) |
| | (noac ? NFS_MOUNT_NOAC : 0) |
| | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0) |
| | (noacl ? NFS_MOUNT_NOACL : 0); |
| if (nfs_mount_version >= 2) |
| data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
| if (nfs_mount_version >= 3) |
| data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
| if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
| bb_error_msg("NFSv%d not supported", nfsvers); |
| goto fail; |
| } |
| if (nfsvers && !mountvers) |
| mountvers = (nfsvers < 3) ? 1 : nfsvers; |
| if (nfsvers && nfsvers < mountvers) { |
| mountvers = nfsvers; |
| } |
| |
| /* Adjust options if none specified */ |
| if (!data.timeo) |
| data.timeo = tcp ? 70 : 7; |
| |
| data.version = nfs_mount_version; |
| |
| if (vfsflags & MS_REMOUNT) |
| goto do_mount; |
| |
| /* |
| * If the previous mount operation on the same host was |
| * backgrounded, and the "bg" for this mount is also set, |
| * give up immediately, to avoid the initial timeout. |
| */ |
| if (bg && we_saw_this_host_before(hostname)) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| |
| /* Create mount daemon client */ |
| /* See if the nfs host = mount host. */ |
| if (mounthost) { |
| if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
| mount_server_addr.sin_family = AF_INET; |
| mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
| } else { |
| hp = gethostbyname(mounthost); |
| if (hp == NULL) { |
| bb_herror_msg("%s", mounthost); |
| goto fail; |
| } |
| if (hp->h_length != (int)sizeof(struct in_addr)) { |
| bb_error_msg_and_die("only IPv4 is supported"); |
| } |
| mount_server_addr.sin_family = AF_INET; |
| memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); |
| } |
| } |
| |
| /* |
| * The following loop implements the mount retries. When the mount |
| * times out, and the "bg" option is set, we background ourself |
| * and continue trying. |
| * |
| * The case where the mount point is not present and the "bg" |
| * option is set, is treated as a timeout. This is done to |
| * support nested mounts. |
| * |
| * The "retry" count specified by the user is the number of |
| * minutes to retry before giving up. |
| */ |
| { |
| struct timeval total_timeout; |
| struct timeval retry_timeout; |
| struct pmap pm_mnt; |
| time_t t; |
| time_t prevt; |
| time_t timeout; |
| |
| retry_timeout.tv_sec = 3; |
| retry_timeout.tv_usec = 0; |
| total_timeout.tv_sec = 20; |
| total_timeout.tv_usec = 0; |
| /* FIXME: use monotonic()? */ |
| timeout = time(NULL) + 60 * retry; |
| prevt = 0; |
| t = 30; |
| retry: |
| /* Be careful not to use too many CPU cycles */ |
| if (t - prevt < 30) |
| sleep(30); |
| |
| get_mountport(&pm_mnt, &mount_server_addr, |
| mountprog, |
| mountvers, |
| proto, |
| mountport); |
| nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
| |
| /* contact the mount daemon via TCP */ |
| mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| msock = RPC_ANYSOCK; |
| |
| switch (pm_mnt.pm_prot) { |
| case IPPROTO_UDP: |
| mclient = clntudp_create(&mount_server_addr, |
| pm_mnt.pm_prog, |
| pm_mnt.pm_vers, |
| retry_timeout, |
| &msock); |
| if (mclient) |
| break; |
| mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| msock = RPC_ANYSOCK; |
| case IPPROTO_TCP: |
| mclient = clnttcp_create(&mount_server_addr, |
| pm_mnt.pm_prog, |
| pm_mnt.pm_vers, |
| &msock, 0, 0); |
| break; |
| default: |
| mclient = NULL; |
| } |
| if (!mclient) { |
| if (!daemonized && prevt == 0) |
| error_msg_rpc(clnt_spcreateerror(" ")); |
| } else { |
| enum clnt_stat clnt_stat; |
| |
| /* Try to mount hostname:pathname */ |
| mclient->cl_auth = authunix_create_default(); |
| |
| /* Make pointers in xdr_mountres3 NULL so |
| * that xdr_array allocates memory for us |
| */ |
| memset(&status, 0, sizeof(status)); |
| |
| if (pm_mnt.pm_vers == 3) |
| clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
| (xdrproc_t) xdr_dirpath, |
| (caddr_t) &pathname, |
| (xdrproc_t) xdr_mountres3, |
| (caddr_t) &status, |
| total_timeout); |
| else |
| clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
| (xdrproc_t) xdr_dirpath, |
| (caddr_t) &pathname, |
| (xdrproc_t) xdr_fhstatus, |
| (caddr_t) &status, |
| total_timeout); |
| |
| if (clnt_stat == RPC_SUCCESS) |
| goto prepare_kernel_data; /* we're done */ |
| if (errno != ECONNREFUSED) { |
| error_msg_rpc(clnt_sperror(mclient, " ")); |
| goto fail; /* don't retry */ |
| } |
| /* Connection refused */ |
| if (!daemonized && prevt == 0) /* print just once */ |
| error_msg_rpc(clnt_sperror(mclient, " ")); |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| mclient = NULL; |
| close(msock); |
| msock = -1; |
| } |
| |
| /* Timeout. We are going to retry... maybe */ |
| if (!bg) |
| goto fail; |
| if (!daemonized) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| prevt = t; |
| t = time(NULL); |
| if (t >= timeout) |
| /* TODO error message */ |
| goto fail; |
| |
| goto retry; |
| } |
| |
| prepare_kernel_data: |
| |
| if (nfsvers == 2) { |
| if (status.nfsv2.fhs_status != 0) { |
| bb_error_msg("%s:%s failed, reason given by server: %s", |
| hostname, pathname, |
| nfs_strerror(status.nfsv2.fhs_status)); |
| goto fail; |
| } |
| memcpy(data.root.data, |
| (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| NFS_FHSIZE); |
| data.root.size = NFS_FHSIZE; |
| memcpy(data.old_root.data, |
| (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| NFS_FHSIZE); |
| } else { |
| fhandle3 *my_fhandle; |
| if (status.nfsv3.fhs_status != 0) { |
| bb_error_msg("%s:%s failed, reason given by server: %s", |
| hostname, pathname, |
| nfs_strerror(status.nfsv3.fhs_status)); |
| goto fail; |
| } |
| my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
| memset(data.old_root.data, 0, NFS_FHSIZE); |
| memset(&data.root, 0, sizeof(data.root)); |
| data.root.size = my_fhandle->fhandle3_len; |
| memcpy(data.root.data, |
| (char *) my_fhandle->fhandle3_val, |
| my_fhandle->fhandle3_len); |
| |
| data.flags |= NFS_MOUNT_VER3; |
| } |
| |
| /* Create nfs socket for kernel */ |
| if (tcp) { |
| if (nfs_mount_version < 3) { |
| bb_error_msg("NFS over TCP is not supported"); |
| goto fail; |
| } |
| fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| } else |
| fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| if (fsock < 0) { |
| bb_perror_msg("nfs socket"); |
| goto fail; |
| } |
| if (bindresvport(fsock, 0) < 0) { |
| bb_perror_msg("nfs bindresvport"); |
| goto fail; |
| } |
| if (port == 0) { |
| server_addr.sin_port = PMAPPORT; |
| port = pmap_getport(&server_addr, nfsprog, nfsvers, |
| tcp ? IPPROTO_TCP : IPPROTO_UDP); |
| if (port == 0) |
| port = NFS_PORT; |
| } |
| server_addr.sin_port = htons(port); |
| |
| /* Prepare data structure for kernel */ |
| data.fd = fsock; |
| memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
| strncpy(data.hostname, hostname, sizeof(data.hostname)); |
| |
| /* Clean up */ |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| close(msock); |
| msock = -1; |
| |
| if (bg) { |
| /* We must wait until mount directory is available */ |
| struct stat statbuf; |
| int delay = 1; |
| while (stat(mp->mnt_dir, &statbuf) == -1) { |
| if (!daemonized) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| /* FIXME: parent doesn't close fsock - ??! */ |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
| delay *= 2; |
| if (delay > 30) |
| delay = 30; |
| } |
| } |
| |
| /* Perform actual mount */ |
| do_mount: |
| retval = mount_it_now(mp, vfsflags, (char*)&data); |
| goto ret; |
| |
| /* Abort */ |
| fail: |
| if (msock >= 0) { |
| if (mclient) { |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| } |
| close(msock); |
| } |
| if (fsock >= 0) |
| close(fsock); |
| |
| ret: |
| free(hostname); |
| free(mounthost); |
| free(filteropts); |
| return retval; |
| } |
| |
| #else // !ENABLE_FEATURE_MOUNT_NFS |
| |
| /* Linux 2.6.23+ supports nfs mounts with options passed as a string. |
| * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS. |
| * (However, note that then you lose any chances that NFS over IPv6 would work). |
| */ |
| static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts) |
| { |
| len_and_sockaddr *lsa; |
| char *opts; |
| char *end; |
| char *dotted; |
| int ret; |
| |
| # if ENABLE_FEATURE_IPV6 |
| end = strchr(mp->mnt_fsname, ']'); |
| if (end && end[1] == ':') |
| end++; |
| else |
| # endif |
| /* mount_main() guarantees that ':' is there */ |
| end = strchr(mp->mnt_fsname, ':'); |
| |
| *end = '\0'; |
| lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0); |
| *end = ':'; |
| dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
| if (ENABLE_FEATURE_CLEAN_UP) free(lsa); |
| opts = xasprintf("%s%saddr=%s", |
| filteropts ? filteropts : "", |
| filteropts ? "," : "", |
| dotted |
| ); |
| if (ENABLE_FEATURE_CLEAN_UP) free(dotted); |
| ret = mount_it_now(mp, vfsflags, opts); |
| if (ENABLE_FEATURE_CLEAN_UP) free(opts); |
| |
| return ret; |
| } |
| |
| #endif // !ENABLE_FEATURE_MOUNT_NFS |
| |
| // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
| // type detection. Returns 0 for success, nonzero for failure. |
| // NB: mp->xxx fields may be trashed on exit |
| static int singlemount(struct mntent *mp, int ignore_busy) |
| { |
| int rc = -1; |
| unsigned long vfsflags; |
| char *loopFile = NULL, *filteropts = NULL; |
| llist_t *fl = NULL; |
| struct stat st; |
| |
| errno = 0; |
| |
| vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
| |
| // Treat fstype "auto" as unspecified |
| if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
| mp->mnt_type = NULL; |
| |
| // Might this be a virtual filesystem? |
| if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) { |
| char *args[35]; |
| char *s; |
| int n; |
| // fsname: "cmd#arg1#arg2..." |
| // WARNING: allows execution of arbitrary commands! |
| // Try "mount 'sh#-c#sh' bogus_dir". |
| // It is safe ONLY because non-root |
| // cannot use two-argument mount command |
| // and using one-argument "mount 'sh#-c#sh'" doesn't work: |
| // "mount: can't find sh#-c#sh in /etc/fstab" |
| // (if /etc/fstab has it, it's ok: root sets up /etc/fstab). |
| |
| s = mp->mnt_fsname; |
| n = 0; |
| args[n++] = s; |
| while (*s && n < 35 - 2) { |
| if (*s++ == '#' && *s != '#') { |
| s[-1] = '\0'; |
| args[n++] = s; |
| } |
| } |
| args[n++] = mp->mnt_dir; |
| args[n] = NULL; |
| rc = spawn_and_wait(args); |
| goto report_error; |
| } |
| |
| // Might this be an CIFS filesystem? |
| if (ENABLE_FEATURE_MOUNT_CIFS |
| && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) |
| && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') |
| && mp->mnt_fsname[0] == mp->mnt_fsname[1] |
| ) { |
| int len; |
| char c; |
| char *hostname, *share; |
| char *dotted, *ip; |
| len_and_sockaddr *lsa; |
| |
| // Parse mp->mnt_fsname of the form "//hostname/share[/dir1/dir2]" |
| |
| hostname = mp->mnt_fsname + 2; |
| len = strcspn(hostname, "/\\"); |
| share = hostname + len + 1; |
| if (len == 0 // 3rd char is a [back]slash (IOW: empty hostname) |
| || share[-1] == '\0' // no [back]slash after hostname |
| || share[0] == '\0' // empty share name |
| ) { |
| goto report_error; |
| } |
| c = share[-1]; |
| share[-1] = '\0'; |
| len = strcspn(share, "/\\"); |
| |
| // "unc=\\hostname\share" option is mandatory |
| // after CIFS option parsing was rewritten in Linux 3.4. |
| // Must use backslashes. |
| // If /dir1/dir2 is present, also add "prefixpath=dir1/dir2" |
| { |
| char *unc = xasprintf( |
| share[len] != '\0' /* "/dir1/dir2" exists? */ |
| ? "unc=\\\\%s\\%.*s,prefixpath=%s" |
| : "unc=\\\\%s\\%.*s", |
| hostname, |
| len, share, |
| share + len + 1 /* "dir1/dir2" */ |
| ); |
| parse_mount_options(unc, &filteropts); |
| if (ENABLE_FEATURE_CLEAN_UP) free(unc); |
| } |
| |
| lsa = host2sockaddr(hostname, 0); |
| share[-1] = c; |
| if (!lsa) |
| goto report_error; |
| |
| // Insert "ip=..." option into options |
| dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
| if (ENABLE_FEATURE_CLEAN_UP) free(lsa); |
| ip = xasprintf("ip=%s", dotted); |
| if (ENABLE_FEATURE_CLEAN_UP) free(dotted); |
| parse_mount_options(ip, &filteropts); |
| if (ENABLE_FEATURE_CLEAN_UP) free(ip); |
| |
| mp->mnt_type = (char*)"cifs"; |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| |
| goto report_error; |
| } |
| |
| // Might this be an NFS filesystem? |
| if ((!mp->mnt_type || is_prefixed_with(mp->mnt_type, "nfs")) |
| && strchr(mp->mnt_fsname, ':') != NULL |
| ) { |
| if (!mp->mnt_type) |
| mp->mnt_type = (char*)"nfs"; |
| rc = nfsmount(mp, vfsflags, filteropts); |
| goto report_error; |
| } |
| |
| // Look at the file. (Not found isn't a failure for remount, or for |
| // a synthetic filesystem like proc or sysfs.) |
| // (We use stat, not lstat, in order to allow |
| // mount symlink_to_file_or_blkdev dir) |
| if (!stat(mp->mnt_fsname, &st) |
| && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) |
| ) { |
| // Do we need to allocate a loopback device for it? |
| if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
| loopFile = bb_simplify_path(mp->mnt_fsname); |
| mp->mnt_fsname = NULL; // will receive malloced loop dev name |
| if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) { |
| if (errno == EPERM || errno == EACCES) |
| bb_error_msg(bb_msg_perm_denied_are_you_root); |
| else |
| bb_perror_msg("can't setup loop device"); |
| return errno; |
| } |
| |
| // Autodetect bind mounts |
| } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
| vfsflags |= MS_BIND; |
| } |
| |
| // If we know the fstype (or don't need to), jump straight |
| // to the actual mount. |
| if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) { |
| char *next; |
| for (;;) { |
| next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL; |
| if (next) |
| *next = '\0'; |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| if (rc == 0 || !next) |
| break; |
| mp->mnt_type = next + 1; |
| } |
| } else { |
| // Loop through filesystem types until mount succeeds |
| // or we run out |
| |
| // Initialize list of block backed filesystems. |
| // This has to be done here so that during "mount -a", |
| // mounts after /proc shows up can autodetect. |
| if (!fslist) { |
| fslist = get_block_backed_filesystems(); |
| if (ENABLE_FEATURE_CLEAN_UP && fslist) |
| atexit(delete_block_backed_filesystems); |
| } |
| |
| for (fl = fslist; fl; fl = fl->link) { |
| mp->mnt_type = fl->data; |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| if (rc == 0) |
| break; |
| } |
| } |
| |
| // If mount failed, clean up loop file (if any). |
| if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
| del_loop(mp->mnt_fsname); |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(loopFile); |
| /* No, "rc != 0" needs it: free(mp->mnt_fsname); */ |
| } |
| } |
| |
| report_error: |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(filteropts); |
| |
| if (errno == EBUSY && ignore_busy) |
| return 0; |
| if (errno == ENOENT && (vfsflags & MOUNT_NOFAIL)) |
| return 0; |
| if (rc != 0) |
| bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
| return rc; |
| } |
| |
| // -O support |
| // -O interprets a list of filter options which select whether a mount |
| // point will be mounted: only mounts with options matching *all* filtering |
| // options will be selected. |
| // By default each -O filter option must be present in the list of mount |
| // options, but if it is prefixed by "no" then it must be absent. |
| // For example, |
| // -O a,nob,c matches -o a,c but fails to match -o a,b,c |
| // (and also fails to match -o a because -o c is absent). |
| // |
| // It is different from -t in that each option is matched exactly; a leading |
| // "no" at the beginning of one option does not negate the rest. |
| static int match_opt(const char *fs_opt_in, const char *O_opt) |
| { |
| if (!O_opt) |
| return 1; |
| |
| while (*O_opt) { |
| const char *fs_opt = fs_opt_in; |
| int O_len; |
| int match; |
| |
| // If option begins with "no" then treat as an inverted match: |
| // matching is a failure |
| match = 0; |
| if (O_opt[0] == 'n' && O_opt[1] == 'o') { |
| match = 1; |
| O_opt += 2; |
| } |
| // Isolate the current O option |
| O_len = strchrnul(O_opt, ',') - O_opt; |
| // Check for a match against existing options |
| while (1) { |
| if (strncmp(fs_opt, O_opt, O_len) == 0 |
| && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',') |
| ) { |
| if (match) |
| return 0; // "no" prefix, but option found |
| match = 1; // current O option found, go check next one |
| break; |
| } |
| fs_opt = strchr(fs_opt, ','); |
| if (!fs_opt) |
| break; |
| fs_opt++; |
| } |
| if (match == 0) |
| return 0; // match wanted but not found |
| if (O_opt[O_len] == '\0') // end? |
| break; |
| // Step to the next O option |
| O_opt += O_len + 1; |
| } |
| // If we get here then everything matched |
| return 1; |
| } |
| |
| // Parse options, if necessary parse fstab/mtab, and call singlemount for |
| // each directory to be mounted. |
| int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int mount_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char *cmdopts = xzalloc(1); |
| char *fstype = NULL; |
| char *O_optmatch = NULL; |
| char *storage_path; |
| llist_t *lst_o = NULL; |
| const char *fstabname = "/etc/fstab"; |
| FILE *fstab; |
| int i, j; |
| int rc = EXIT_SUCCESS; |
| unsigned long cmdopt_flags; |
| unsigned opt; |
| struct mntent mtpair[2], *mtcur = mtpair; |
| IF_NOT_DESKTOP(const int nonroot = 0;) |
| |
| IF_DESKTOP(int nonroot = ) sanitize_env_if_suid(); |
| |
| INIT_G(); |
| |
| // Parse long options, like --bind and --move. Note that -o option |
| // and --option are synonymous. Yes, this means --remount,rw works. |
| for (i = j = 1; argv[i]; i++) { |
| if (argv[i][0] == '-' && argv[i][1] == '-') |
| append_mount_options(&cmdopts, argv[i] + 2); |
| else |
| argv[j++] = argv[i]; |
| } |
| argv[j] = NULL; |
| |
| // Parse remaining options |
| // Max 2 params; -o is a list, -v is a counter |
| opt_complementary = "?2" IF_FEATURE_MOUNT_VERBOSE("vv"); |
| opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch |
| IF_FEATURE_MOUNT_OTHERTAB(, &fstabname) |
| IF_FEATURE_MOUNT_VERBOSE(, &verbose)); |
| while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o |
| if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r |
| if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w |
| argv += optind; |
| |
| // If we have no arguments, show currently mounted filesystems |
| if (!argv[0]) { |
| if (!(opt & OPT_a)) { |
| FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
| |
| if (!mountTable) |
| bb_error_msg_and_die("no %s", bb_path_mtab_file); |
| |
| while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
| GETMNTENT_BUFSIZE)) |
| { |
| // Don't show rootfs. FIXME: why?? |
| // util-linux 2.12a happily shows rootfs... |
| //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue; |
| |
| if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0) |
| printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
| mtpair->mnt_dir, mtpair->mnt_type, |
| mtpair->mnt_opts); |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) |
| endmntent(mountTable); |
| return EXIT_SUCCESS; |
| } |
| storage_path = NULL; |
| } else { |
| // When we have two arguments, the second is the directory and we can |
| // skip looking at fstab entirely. We can always abspath() the directory |
| // argument when we get it. |
| if (argv[1]) { |
| if (nonroot) |
| bb_error_msg_and_die(bb_msg_you_must_be_root); |
| mtpair->mnt_fsname = argv[0]; |
| mtpair->mnt_dir = argv[1]; |
| mtpair->mnt_type = fstype; |
| mtpair->mnt_opts = cmdopts; |
| resolve_mount_spec(&mtpair->mnt_fsname); |
| rc = singlemount(mtpair, /*ignore_busy:*/ 0); |
| return rc; |
| } |
| storage_path = bb_simplify_path(argv[0]); // malloced |
| } |
| |
| // Past this point, we are handling either "mount -a [opts]" |
| // or "mount [opts] single_param" |
| |
| cmdopt_flags = parse_mount_options(cmdopts, NULL); |
| if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags |
| bb_error_msg_and_die(bb_msg_you_must_be_root); |
| |
| // If we have a shared subtree flag, don't worry about fstab or mtab. |
| if (ENABLE_FEATURE_MOUNT_FLAGS |
| && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) |
| ) { |
| // verbose_mount(source, target, type, flags, data) |
| rc = verbose_mount("", argv[0], "", cmdopt_flags, ""); |
| if (rc) |
| bb_simple_perror_msg_and_die(argv[0]); |
| return rc; |
| } |
| |
| // A malicious user could overmount /usr without this. |
| if (ENABLE_FEATURE_MOUNT_OTHERTAB && nonroot) |
| fstabname = "/etc/fstab"; |
| // Open either fstab or mtab |
| if (cmdopt_flags & MS_REMOUNT) { |
| // WARNING. I am not sure this matches util-linux's |
| // behavior. It's possible util-linux does not |
| // take -o opts from mtab (takes only mount source). |
| fstabname = bb_path_mtab_file; |
| } |
| fstab = setmntent(fstabname, "r"); |
| if (!fstab) |
| bb_perror_msg_and_die("can't read '%s'", fstabname); |
| |
| // Loop through entries until we find what we're looking for |
| memset(mtpair, 0, sizeof(mtpair)); |
| for (;;) { |
| struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair); |
| |
| // Get next fstab entry |
| if (!getmntent_r(fstab, mtcur, getmntent_buf |
| + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0), |
| GETMNTENT_BUFSIZE/2) |
| ) { // End of fstab/mtab is reached |
| mtcur = mtother; // the thing we found last time |
| break; |
| } |
| |
| // If we're trying to mount something specific and this isn't it, |
| // skip it. Note we must match the exact text in fstab (ala |
| // "proc") or a full path from root |
| if (argv[0]) { |
| |
| // Is this what we're looking for? |
| if (strcmp(argv[0], mtcur->mnt_fsname) != 0 |
| && strcmp(storage_path, mtcur->mnt_fsname) != 0 |
| && strcmp(argv[0], mtcur->mnt_dir) != 0 |
| && strcmp(storage_path, mtcur->mnt_dir) != 0 |
| ) { |
| continue; // no |
| } |
| |
| // Remember this entry. Something later may have |
| // overmounted it, and we want the _last_ match. |
| mtcur = mtother; |
| |
| // If we're mounting all |
| } else { |
| struct mntent *mp; |
| // No, mount -a won't mount anything, |
| // even user mounts, for mere humans |
| if (nonroot) |
| bb_error_msg_and_die(bb_msg_you_must_be_root); |
| |
| // Does type match? (NULL matches always) |
| if (!match_fstype(mtcur, fstype)) |
| continue; |
| |
| // Skip noauto and swap anyway |
| if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
| // swap is bogus "fstype", parse_mount_options can't check fstypes |
| || strcasecmp(mtcur->mnt_type, "swap") == 0 |
| ) { |
| continue; |
| } |
| |
| // Does (at least one) option match? |
| // (NULL matches always) |
| if (!match_opt(mtcur->mnt_opts, O_optmatch)) |
| continue; |
| |
| resolve_mount_spec(&mtcur->mnt_fsname); |
| |
| // NFS mounts want this to be xrealloc-able |
| mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| |
| // If nothing is mounted on this directory... |
| // (otherwise repeated "mount -a" mounts everything again) |
| mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
| // We do not check fsname match of found mount point - |
| // "/" may have fsname of "/dev/root" while fstab |
| // says "/dev/something_else". |
| if (mp) { |
| if (verbose) { |
| bb_error_msg("according to %s, " |
| "%s is already mounted on %s", |
| bb_path_mtab_file, |
| mp->mnt_fsname, mp->mnt_dir); |
| } |
| } else { |
| // ...mount this thing |
| if (singlemount(mtcur, /*ignore_busy:*/ 1)) { |
| // Count number of failed mounts |
| rc++; |
| } |
| } |
| free(mtcur->mnt_opts); |
| } |
| } |
| |
| // End of fstab/mtab is reached. |
| // Were we looking for something specific? |
| if (argv[0]) { // yes |
| unsigned long l; |
| |
| // If we didn't find anything, complain |
| if (!mtcur->mnt_fsname) |
| bb_error_msg_and_die("can't find %s in %s", |
| argv[0], fstabname); |
| |
| // What happens when we try to "mount swap_partition"? |
| // (fstab containts "swap_partition swap swap defaults 0 0") |
| // util-linux-ng 2.13.1 does this: |
| // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory) |
| // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory) |
| // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory) |
| // write(2, "mount: mount point swap does not exist\n", 39) = 39 |
| // exit_group(32) = ? |
| #if 0 |
| // In case we want to simply skip swap partitions: |
| l = parse_mount_options(mtcur->mnt_opts, NULL); |
| if ((l & MOUNT_SWAP) |
| // swap is bogus "fstype", parse_mount_options can't check fstypes |
| || strcasecmp(mtcur->mnt_type, "swap") == 0 |
| ) { |
| goto ret; |
| } |
| #endif |
| if (nonroot) { |
| // fstab must have "users" or "user" |
| l = parse_mount_options(mtcur->mnt_opts, NULL); |
| if (!(l & MOUNT_USERS)) |
| bb_error_msg_and_die(bb_msg_you_must_be_root); |
| } |
| |
| //util-linux-2.12 does not do this check. |
| //// If nothing is mounted on this directory... |
| //// (otherwise repeated "mount FOO" mounts FOO again) |
| //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
| //if (mp) { |
| // bb_error_msg("according to %s, " |
| // "%s is already mounted on %s", |
| // bb_path_mtab_file, |
| // mp->mnt_fsname, mp->mnt_dir); |
| //} else { |
| // ...mount the last thing we found |
| mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| append_mount_options(&(mtcur->mnt_opts), cmdopts); |
| resolve_mount_spec(&mtpair->mnt_fsname); |
| rc = singlemount(mtcur, /*ignore_busy:*/ 0); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(mtcur->mnt_opts); |
| //} |
| } |
| |
| //ret: |
| if (ENABLE_FEATURE_CLEAN_UP) |
| endmntent(fstab); |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(storage_path); |
| free(cmdopts); |
| } |
| |
| //TODO: exitcode should be ORed mask of (from "man mount"): |
| // 0 success |
| // 1 incorrect invocation or permissions |
| // 2 system error (out of memory, cannot fork, no more loop devices) |
| // 4 internal mount bug or missing nfs support in mount |
| // 8 user interrupt |
| //16 problems writing or locking /etc/mtab |
| //32 mount failure |
| //64 some mount succeeded |
| return rc; |
| } |