[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini mount implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 7 | * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | */
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| 11 |
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| 12 | /* todo:
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| 13 | * bb_getopt_ulflags();
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| 14 | */
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| 15 |
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| 16 | /* Design notes: There is no spec for mount. Remind me to write one.
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| 17 |
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| 18 | mount_main() calls singlemount() which calls mount_it_now().
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| 19 |
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| 20 | mount_main() can loop through /etc/fstab for mount -a
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| 21 | singlemount() can loop through /etc/filesystems for fstype detection.
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| 22 | mount_it_now() does the actual mount.
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| 23 | */
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| 24 |
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| 25 | #include "busybox.h"
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| 26 | #include <unistd.h>
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| 27 | #include <errno.h>
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| 28 | #include <string.h>
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| 29 | #include <mntent.h>
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| 30 | #include <ctype.h>
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| 31 | #include <fcntl.h> // for CONFIG_FEATURE_MOUNT_LOOP
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| 32 | #include <sys/ioctl.h> // for CONFIG_FEATURE_MOUNT_LOOP
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| 33 |
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| 34 | // These two aren't always defined in old headers
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| 35 | #ifndef MS_BIND
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| 36 | #define MS_BIND 4096
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| 37 | #endif
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| 38 | #ifndef MS_MOVE
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| 39 | #define MS_MOVE 8192
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| 40 | #endif
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| 41 | #ifndef MS_SILENT
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| 42 | #define MS_SILENT 32768
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| 43 | #endif
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| 44 |
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| 45 | // Not real flags, but we want to be able to check for this.
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| 46 | #define MOUNT_NOAUTO (1<<29)
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| 47 | #define MOUNT_SWAP (1<<30)
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| 48 | /* Standard mount options (from -o options or --options), with corresponding
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| 49 | * flags */
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| 50 |
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| 51 | struct {
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| 52 | const char *name;
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| 53 | long flags;
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| 54 | } static const mount_options[] = {
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| 55 | // NOP flags.
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| 56 |
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| 57 | {"loop", 0},
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| 58 | {"defaults", 0},
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| 59 | {"quiet", 0},
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| 60 |
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| 61 | // vfs flags
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| 62 |
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| 63 | {"ro", MS_RDONLY},
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| 64 | {"rw", ~MS_RDONLY},
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| 65 | {"nosuid", MS_NOSUID},
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| 66 | {"suid", ~MS_NOSUID},
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| 67 | {"dev", ~MS_NODEV},
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| 68 | {"nodev", MS_NODEV},
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| 69 | {"exec", ~MS_NOEXEC},
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| 70 | {"noexec", MS_NOEXEC},
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| 71 | {"sync", MS_SYNCHRONOUS},
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| 72 | {"async", ~MS_SYNCHRONOUS},
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| 73 | {"atime", ~MS_NOATIME},
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| 74 | {"noatime", MS_NOATIME},
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| 75 | {"diratime", ~MS_NODIRATIME},
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| 76 | {"nodiratime", MS_NODIRATIME},
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| 77 | {"loud", ~MS_SILENT},
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| 78 |
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| 79 | // action flags
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| 80 |
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| 81 | {"remount", MS_REMOUNT},
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| 82 | {"bind", MS_BIND},
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| 83 | {"move", MS_MOVE},
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| 84 | {"noauto",MOUNT_NOAUTO},
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| 85 | {"swap",MOUNT_SWAP}
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| 86 | };
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| 87 |
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| 88 | /* Append mount options to string */
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| 89 | static void append_mount_options(char **oldopts, char *newopts)
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| 90 | {
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| 91 | if(*oldopts && **oldopts) {
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| 92 | char *temp=bb_xasprintf("%s,%s",*oldopts,newopts);
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| 93 | free(*oldopts);
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| 94 | *oldopts=temp;
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| 95 | } else {
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| 96 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
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| 97 | *oldopts = bb_xstrdup(newopts);
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| 98 | }
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| 99 | }
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| 100 |
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| 101 | /* Use the mount_options list to parse options into flags.
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| 102 | * Return list of unrecognized options in *strflags if strflags!=NULL */
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| 103 | static int parse_mount_options(char *options, char **unrecognized)
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| 104 | {
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| 105 | int flags = MS_SILENT;
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| 106 |
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| 107 | // Loop through options
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| 108 | for (;;) {
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| 109 | int i;
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| 110 | char *comma = strchr(options, ',');
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| 111 |
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| 112 | if (comma) *comma = 0;
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| 113 |
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| 114 | // Find this option in mount_options
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| 115 | for (i = 0; i < (sizeof(mount_options) / sizeof(*mount_options)); i++) {
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| 116 | if (!strcasecmp(mount_options[i].name, options)) {
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| 117 | long fl = mount_options[i].flags;
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| 118 | if(fl < 0) flags &= fl;
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| 119 | else flags |= fl;
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| 120 | break;
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| 121 | }
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| 122 | }
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| 123 | // If unrecognized not NULL, append unrecognized mount options */
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| 124 | if (unrecognized
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| 125 | && i == (sizeof(mount_options) / sizeof(*mount_options)))
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| 126 | {
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| 127 | // Add it to strflags, to pass on to kernel
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| 128 | i = *unrecognized ? strlen(*unrecognized) : 0;
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| 129 | *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
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| 130 |
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| 131 | // Comma separated if it's not the first one
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| 132 | if (i) (*unrecognized)[i++] = ',';
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| 133 | strcpy((*unrecognized)+i, options);
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| 134 | }
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| 135 |
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| 136 | // Advance to next option, or finish
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| 137 | if(comma) {
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| 138 | *comma = ',';
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| 139 | options = ++comma;
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| 140 | } else break;
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| 141 | }
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| 142 |
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| 143 | return flags;
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| 144 | }
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| 145 |
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| 146 | // Return a list of all block device backed filesystems
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| 147 |
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| 148 | static llist_t *get_block_backed_filesystems(void)
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| 149 | {
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| 150 | char *fs, *buf,
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| 151 | *filesystems[] = {"/etc/filesystems", "/proc/filesystems", 0};
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| 152 | llist_t *list = 0;
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| 153 | int i;
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| 154 | FILE *f;
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| 155 |
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| 156 | for(i = 0; filesystems[i]; i++) {
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| 157 | if(!(f = fopen(filesystems[i], "r"))) continue;
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| 158 |
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| 159 | for(fs = buf = 0; (fs = buf = bb_get_chomped_line_from_file(f));
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| 160 | free(buf))
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| 161 | {
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| 162 | if(!strncmp(buf,"nodev",5) && isspace(buf[5])) continue;
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| 163 |
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| 164 | while(isspace(*fs)) fs++;
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| 165 | if(*fs=='#' || *fs=='*') continue;
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| 166 | if(!*fs) continue;
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| 167 |
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| 168 | llist_add_to_end(&list,bb_xstrdup(fs));
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| 169 | }
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| 170 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
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| 171 | }
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| 172 |
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| 173 | return list;
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| 174 | }
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| 175 |
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| 176 | llist_t *fslist = 0;
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| 177 |
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| 178 | #if ENABLE_FEATURE_CLEAN_UP
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| 179 | static void delete_block_backed_filesystems(void)
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| 180 | {
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| 181 | llist_free(fslist, free);
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| 182 | }
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| 183 | #else
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| 184 | void delete_block_backed_filesystems(void);
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| 185 | #endif
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| 186 |
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| 187 | #if ENABLE_FEATURE_MTAB_SUPPORT
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| 188 | static int useMtab;
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| 189 | static int fakeIt;
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| 190 | #else
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| 191 | #define useMtab 0
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| 192 | #define fakeIt 0
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| 193 | #endif
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| 194 |
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| 195 | // Perform actual mount of specific filesystem at specific location.
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| 196 |
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| 197 | static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
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| 198 | {
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| 199 | int rc;
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| 200 |
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| 201 | if (fakeIt) { return 0; }
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| 202 |
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| 203 | // Mount, with fallback to read-only if necessary.
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| 204 |
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| 205 | for(;;) {
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| 206 | rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
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| 207 | vfsflags, filteropts);
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| 208 | if(!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
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| 209 | break;
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| 210 | bb_error_msg("%s is write-protected, mounting read-only",
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| 211 | mp->mnt_fsname);
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| 212 | vfsflags |= MS_RDONLY;
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| 213 | }
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| 214 |
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| 215 | // Abort entirely if permission denied.
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| 216 |
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| 217 | if (rc && errno == EPERM)
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| 218 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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| 219 |
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| 220 | /* If the mount was successful, and we're maintaining an old-style
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| 221 | * mtab file by hand, add the new entry to it now. */
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| 222 |
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| 223 | if(ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc) {
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| 224 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
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| 225 | int i;
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| 226 |
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| 227 | if(!mountTable)
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| 228 | bb_error_msg("No %s\n",bb_path_mtab_file);
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| 229 |
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| 230 | // Add vfs string flags
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| 231 |
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| 232 | for(i=0; mount_options[i].flags != MS_REMOUNT; i++)
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| 233 | if (mount_options[i].flags > 0)
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| 234 | append_mount_options(&(mp->mnt_opts),
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| 235 | // Shut up about the darn const. It's not important. I don't care.
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| 236 | (char *)mount_options[i].name);
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| 237 |
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| 238 | // Remove trailing / (if any) from directory we mounted on
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| 239 |
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| 240 | i = strlen(mp->mnt_dir);
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| 241 | if(i>1 && mp->mnt_dir[i-1] == '/') mp->mnt_dir[i-1] = 0;
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| 242 |
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| 243 | // Write and close.
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| 244 |
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| 245 | if(!mp->mnt_type || !*mp->mnt_type) mp->mnt_type="--bind";
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| 246 | addmntent(mountTable, mp);
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| 247 | endmntent(mountTable);
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| 248 | if (ENABLE_FEATURE_CLEAN_UP)
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| 249 | if(strcmp(mp->mnt_type,"--bind")) mp->mnt_type = 0;
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| 250 | }
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| 251 |
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| 252 | return rc;
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| 253 | }
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| 254 |
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| 255 |
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| 256 | // Mount one directory. Handles NFS, loopback, autobind, and filesystem type
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| 257 | // detection. Returns 0 for success, nonzero for failure.
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| 258 |
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| 259 | static int singlemount(struct mntent *mp, int ignore_busy)
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| 260 | {
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| 261 | int rc = -1, vfsflags;
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| 262 | char *loopFile = 0, *filteropts = 0;
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| 263 | llist_t *fl = 0;
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| 264 | struct stat st;
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| 265 |
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| 266 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
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| 267 |
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| 268 | // Treat fstype "auto" as unspecified.
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| 269 |
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| 270 | if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0;
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| 271 |
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| 272 | // Might this be an NFS filesystem?
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| 273 |
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| 274 | if (ENABLE_FEATURE_MOUNT_NFS &&
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| 275 | (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) &&
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| 276 | strchr(mp->mnt_fsname, ':') != NULL)
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| 277 | {
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| 278 | if (nfsmount(mp->mnt_fsname, mp->mnt_dir, &vfsflags, &filteropts, 1)) {
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| 279 | bb_perror_msg("nfsmount failed");
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| 280 | goto report_error;
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| 281 | } else {
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| 282 | // Strangely enough, nfsmount() doesn't actually mount() anything.
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| 283 | mp->mnt_type = "nfs";
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| 284 | rc = mount_it_now(mp, vfsflags, filteropts);
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| 285 | if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
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| 286 |
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| 287 | goto report_error;
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| 288 | }
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| 289 | }
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| 290 |
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| 291 | // Look at the file. (Not found isn't a failure for remount, or for
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| 292 | // a synthetic filesystem like proc or sysfs.)
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| 293 |
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[902] | 294 | if (stat(mp->mnt_fsname, &st));
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[821] | 295 | else if (!(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
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| 296 | // Do we need to allocate a loopback device for it?
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| 297 |
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| 298 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
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| 299 | loopFile = bb_simplify_path(mp->mnt_fsname);
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| 300 | mp->mnt_fsname = 0;
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| 301 | switch(set_loop(&(mp->mnt_fsname), loopFile, 0)) {
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| 302 | case 0:
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| 303 | case 1:
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| 304 | break;
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| 305 | default:
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| 306 | bb_error_msg( errno == EPERM || errno == EACCES
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| 307 | ? bb_msg_perm_denied_are_you_root
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| 308 | : "Couldn't setup loop device");
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| 309 | return errno;
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| 310 | }
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| 311 |
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| 312 | // Autodetect bind mounts
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| 313 |
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| 314 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) vfsflags |= MS_BIND;
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| 315 | }
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| 316 |
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| 317 | /* If we know the fstype (or don't need to), jump straight
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| 318 | * to the actual mount. */
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| 319 |
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| 320 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
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| 321 | rc = mount_it_now(mp, vfsflags, filteropts);
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| 322 |
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| 323 | // Loop through filesystem types until mount succeeds or we run out
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| 324 |
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| 325 | else {
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| 326 |
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| 327 | /* Initialize list of block backed filesystems. This has to be
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| 328 | * done here so that during "mount -a", mounts after /proc shows up
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| 329 | * can autodetect. */
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| 330 |
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| 331 | if (!fslist) {
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| 332 | fslist = get_block_backed_filesystems();
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| 333 | if (ENABLE_FEATURE_CLEAN_UP && fslist)
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| 334 | atexit(delete_block_backed_filesystems);
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| 335 | }
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| 336 |
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| 337 | for (fl = fslist; fl; fl = fl->link) {
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| 338 | mp->mnt_type = fl->data;
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| 339 |
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| 340 | if (!(rc = mount_it_now(mp,vfsflags, filteropts))) break;
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| 341 |
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| 342 | mp->mnt_type = 0;
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| 343 | }
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| 344 | }
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| 345 |
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| 346 | if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
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| 347 |
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| 348 | // If mount failed, clean up loop file (if any).
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| 349 |
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| 350 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
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| 351 | del_loop(mp->mnt_fsname);
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| 352 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 353 | free(loopFile);
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| 354 | free(mp->mnt_fsname);
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| 355 | }
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| 356 | }
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| 357 | report_error:
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| 358 | if (rc && errno == EBUSY && ignore_busy) rc = 0;
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| 359 | if (rc < 0)
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| 360 | bb_perror_msg("Mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
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| 361 |
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| 362 | return rc;
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| 363 | }
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| 364 |
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| 365 | // Parse options, if necessary parse fstab/mtab, and call singlemount for
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| 366 | // each directory to be mounted.
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| 367 |
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| 368 | int mount_main(int argc, char **argv)
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| 369 | {
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| 370 | char *cmdopts = bb_xstrdup(""), *fstabname, *fstype=0, *storage_path=0;
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| 371 | FILE *fstab;
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| 372 | int i, opt, all = FALSE, rc = 0;
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| 373 | struct mntent mtpair[2], *mtcur = mtpair;
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| 374 |
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| 375 | /* parse long options, like --bind and --move. Note that -o option
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| 376 | * and --option are synonymous. Yes, this means --remount,rw works. */
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| 377 |
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| 378 | for (i = opt = 0; i < argc; i++) {
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| 379 | if (argv[i][0] == '-' && argv[i][1] == '-') {
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| 380 | append_mount_options(&cmdopts,argv[i]+2);
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| 381 | } else argv[opt++] = argv[i];
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| 382 | }
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| 383 | argc = opt;
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| 384 |
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| 385 | // Parse remaining options
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| 386 |
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| 387 | while ((opt = getopt(argc, argv, "o:t:rwavnf")) > 0) {
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| 388 | switch (opt) {
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| 389 | case 'o':
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| 390 | append_mount_options(&cmdopts, optarg);
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| 391 | break;
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| 392 | case 't':
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| 393 | fstype = optarg;
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| 394 | break;
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| 395 | case 'r':
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| 396 | append_mount_options(&cmdopts, "ro");
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| 397 | break;
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| 398 | case 'w':
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| 399 | append_mount_options(&cmdopts, "rw");
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| 400 | break;
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| 401 | case 'a':
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| 402 | all = TRUE;
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| 403 | break;
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| 404 | case 'n':
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| 405 | USE_FEATURE_MTAB_SUPPORT(useMtab = FALSE;)
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| 406 | break;
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| 407 | case 'f':
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| 408 | USE_FEATURE_MTAB_SUPPORT(fakeIt = FALSE;)
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| 409 | break;
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| 410 | case 'v':
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| 411 | break; // ignore -v
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| 412 | default:
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| 413 | bb_show_usage();
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| 414 | }
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| 415 | }
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| 416 |
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| 417 | // Three or more non-option arguments? Die with a usage message.
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| 418 |
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| 419 | if (optind-argc>2) bb_show_usage();
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| 420 |
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| 421 | // If we have no arguments, show currently mounted filesystems
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| 422 |
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| 423 | if (optind == argc) {
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| 424 | if (!all) {
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| 425 | FILE *mountTable = setmntent(bb_path_mtab_file, "r");
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| 426 |
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| 427 | if(!mountTable) bb_error_msg_and_die("No %s",bb_path_mtab_file);
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| 428 |
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| 429 | while (getmntent_r(mountTable,mtpair,bb_common_bufsiz1,
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| 430 | sizeof(bb_common_bufsiz1)))
|
---|
| 431 | {
|
---|
| 432 | // Don't show rootfs.
|
---|
| 433 | if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
|
---|
| 434 |
|
---|
| 435 | if (!fstype || !strcmp(mtpair->mnt_type, fstype))
|
---|
| 436 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
|
---|
| 437 | mtpair->mnt_dir, mtpair->mnt_type,
|
---|
| 438 | mtpair->mnt_opts);
|
---|
| 439 | }
|
---|
| 440 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
|
---|
| 441 | return EXIT_SUCCESS;
|
---|
| 442 | }
|
---|
| 443 | }
|
---|
| 444 |
|
---|
| 445 | // When we have two arguments, the second is the directory and we can
|
---|
| 446 | // skip looking at fstab entirely. We can always abspath() the directory
|
---|
| 447 | // argument when we get it.
|
---|
| 448 |
|
---|
| 449 | if (optind+2 == argc) {
|
---|
| 450 | mtpair->mnt_fsname = argv[optind];
|
---|
| 451 | mtpair->mnt_dir = argv[optind+1];
|
---|
| 452 | mtpair->mnt_type = fstype;
|
---|
| 453 | mtpair->mnt_opts = cmdopts;
|
---|
| 454 | rc = singlemount(mtpair, 0);
|
---|
| 455 | goto clean_up;
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | // If we have at least one argument, it's the storage location
|
---|
| 459 |
|
---|
| 460 | if (optind < argc) storage_path = bb_simplify_path(argv[optind]);
|
---|
| 461 |
|
---|
| 462 | // Open either fstab or mtab
|
---|
| 463 |
|
---|
| 464 | if (parse_mount_options(cmdopts,0) & MS_REMOUNT)
|
---|
| 465 | fstabname = (char *)bb_path_mtab_file; // Again with the evil const.
|
---|
| 466 | else fstabname="/etc/fstab";
|
---|
| 467 |
|
---|
| 468 | if (!(fstab=setmntent(fstabname,"r")))
|
---|
| 469 | bb_perror_msg_and_die("Cannot read %s",fstabname);
|
---|
| 470 |
|
---|
| 471 | // Loop through entries until we find what we're looking for.
|
---|
| 472 |
|
---|
| 473 | memset(mtpair,0,sizeof(mtpair));
|
---|
| 474 | for (;;) {
|
---|
| 475 | struct mntent *mtnext = mtpair + (mtcur==mtpair ? 1 : 0);
|
---|
| 476 |
|
---|
| 477 | // Get next fstab entry
|
---|
| 478 |
|
---|
| 479 | if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1
|
---|
| 480 | + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0),
|
---|
| 481 | sizeof(bb_common_bufsiz1)/2))
|
---|
| 482 | {
|
---|
| 483 | // Were we looking for something specific?
|
---|
| 484 |
|
---|
| 485 | if (optind != argc) {
|
---|
| 486 |
|
---|
| 487 | // If we didn't find anything, complain.
|
---|
| 488 |
|
---|
| 489 | if (!mtnext->mnt_fsname)
|
---|
| 490 | bb_error_msg_and_die("Can't find %s in %s",
|
---|
| 491 | argv[optind], fstabname);
|
---|
| 492 |
|
---|
| 493 | // Mount the last thing we found.
|
---|
| 494 |
|
---|
| 495 | mtcur = mtnext;
|
---|
| 496 | mtcur->mnt_opts=bb_xstrdup(mtcur->mnt_opts);
|
---|
| 497 | append_mount_options(&(mtcur->mnt_opts),cmdopts);
|
---|
| 498 | rc = singlemount(mtcur, 0);
|
---|
| 499 | free(mtcur->mnt_opts);
|
---|
| 500 | }
|
---|
| 501 | goto clean_up;
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 | /* If we're trying to mount something specific and this isn't it,
|
---|
| 505 | * skip it. Note we must match both the exact text in fstab (ala
|
---|
| 506 | * "proc") or a full path from root */
|
---|
| 507 |
|
---|
| 508 | if (optind != argc) {
|
---|
| 509 |
|
---|
| 510 | // Is this what we're looking for?
|
---|
| 511 |
|
---|
| 512 | if(strcmp(argv[optind],mtcur->mnt_fsname) &&
|
---|
| 513 | strcmp(storage_path,mtcur->mnt_fsname) &&
|
---|
| 514 | strcmp(argv[optind],mtcur->mnt_dir) &&
|
---|
| 515 | strcmp(storage_path,mtcur->mnt_dir)) continue;
|
---|
| 516 |
|
---|
| 517 | // Remember this entry. Something later may have overmounted
|
---|
| 518 | // it, and we want the _last_ match.
|
---|
| 519 |
|
---|
| 520 | mtcur = mtnext;
|
---|
| 521 |
|
---|
| 522 | // If we're mounting all.
|
---|
| 523 |
|
---|
| 524 | } else {
|
---|
| 525 |
|
---|
| 526 | // Do we need to match a filesystem type?
|
---|
| 527 | if (fstype && strcmp(mtcur->mnt_type,fstype)) continue;
|
---|
| 528 |
|
---|
| 529 | // Skip noauto and swap anyway.
|
---|
| 530 |
|
---|
| 531 | if (parse_mount_options(mtcur->mnt_opts,0)
|
---|
| 532 | & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
|
---|
| 533 |
|
---|
| 534 | // Mount this thing.
|
---|
| 535 |
|
---|
| 536 | if (singlemount(mtcur, 1)) {
|
---|
| 537 | /* Count number of failed mounts */
|
---|
| 538 | rc++;
|
---|
| 539 | }
|
---|
| 540 | }
|
---|
| 541 | }
|
---|
| 542 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
|
---|
| 543 |
|
---|
| 544 | clean_up:
|
---|
| 545 |
|
---|
| 546 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 547 | free(storage_path);
|
---|
| 548 | free(cmdopts);
|
---|
| 549 | }
|
---|
| 550 |
|
---|
| 551 | return rc;
|
---|
| 552 | }
|
---|