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Diffstat (limited to 'release/src/router/busybox/mount.c')
-rw-r--r--release/src/router/busybox/mount.c472
1 files changed, 472 insertions, 0 deletions
diff --git a/release/src/router/busybox/mount.c b/release/src/router/busybox/mount.c
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+++ b/release/src/router/busybox/mount.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini mount implementation for busybox
+ *
+ * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
+ * searches through fstab when -a is passed
+ * will try mounting stuff with all fses when passed -t auto
+ *
+ * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
+ *
+ * 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
+ * Rewrite of a lot of code. Removed mtab usage (I plan on
+ * putting it back as a compile-time option some time),
+ * major adjustments to option parsing, and some serious
+ * dieting all around.
+ *
+ * 1999-11-06 mtab suppport is back - andersee
+ *
+ * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
+ * mount to add loop support.
+ *
+ * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
+ * Rewrote fstab while loop and lower mount section. Can now do
+ * single mounts from fstab. Can override fstab options for single
+ * mount. Common mount_one call for single mounts and 'all'. Fixed
+ * mtab updating and stale entries. Removed 'remount' default.
+ *
+ */
+
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <ctype.h>
+#include "busybox.h"
+#if defined BB_FEATURE_USE_DEVPS_PATCH
+# include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
+#endif
+
+enum {
+ MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
+ MS_RDONLY = 1, /* Mount read-only */
+ MS_NOSUID = 2, /* Ignore suid and sgid bits */
+ MS_NODEV = 4, /* Disallow access to device special files */
+ MS_NOEXEC = 8, /* Disallow program execution */
+ MS_SYNCHRONOUS = 16, /* Writes are synced at once */
+ MS_REMOUNT = 32, /* Alter flags of a mounted FS */
+ MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
+ S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
+ S_APPEND = 256, /* Append-only file */
+ S_IMMUTABLE = 512, /* Immutable file */
+ MS_NOATIME = 1024, /* Do not update access times. */
+ MS_NODIRATIME = 2048, /* Do not update directory access times */
+ MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
+};
+
+
+#if defined BB_FEATURE_MOUNT_LOOP
+#include <fcntl.h>
+#include <sys/ioctl.h>
+static int use_loop = FALSE;
+#endif
+
+extern int mount (__const char *__special_file, __const char *__dir,
+ __const char *__fstype, unsigned long int __rwflag,
+ __const void *__data);
+extern int umount (__const char *__special_file);
+extern int umount2 (__const char *__special_file, int __flags);
+
+extern int sysfs( int option, unsigned int fs_index, char * buf);
+
+extern const char mtab_file[]; /* Defined in utility.c */
+
+struct mount_options {
+ const char *name;
+ unsigned long and;
+ unsigned long or;
+};
+
+static const struct mount_options mount_options[] = {
+ {"async", ~MS_SYNCHRONOUS, 0},
+ {"atime", ~0, ~MS_NOATIME},
+ {"defaults", ~0, 0},
+ {"dev", ~MS_NODEV, 0},
+ {"diratime", ~0, ~MS_NODIRATIME},
+ {"exec", ~MS_NOEXEC, 0},
+ {"noatime", ~0, MS_NOATIME},
+ {"nodev", ~0, MS_NODEV},
+ {"nodiratime", ~0, MS_NODIRATIME},
+ {"noexec", ~0, MS_NOEXEC},
+ {"nosuid", ~0, MS_NOSUID},
+ {"remount", ~0, MS_REMOUNT},
+ {"ro", ~0, MS_RDONLY},
+ {"rw", ~MS_RDONLY, 0},
+ {"suid", ~MS_NOSUID, 0},
+ {"sync", ~0, MS_SYNCHRONOUS},
+ {"bind", ~0, MS_BIND},
+ {0, 0, 0}
+};
+
+static int
+do_mount(char *specialfile, char *dir, char *filesystemtype,
+ long flags, void *string_flags, int useMtab, int fakeIt,
+ char *mtab_opts, int mount_all)
+{
+ int status = 0;
+#if defined BB_FEATURE_MOUNT_LOOP
+ char *lofile = NULL;
+#endif
+
+ if (fakeIt == FALSE)
+ {
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (use_loop==TRUE) {
+ int loro = flags & MS_RDONLY;
+
+ lofile = specialfile;
+
+ specialfile = find_unused_loop_device();
+ if (specialfile == NULL) {
+ error_msg_and_die("Could not find a spare loop device");
+ }
+ if (set_loop(specialfile, lofile, 0, &loro)) {
+ error_msg_and_die("Could not setup loop device");
+ }
+ if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
+ error_msg("WARNING: loop device is read-only");
+ flags |= MS_RDONLY;
+ }
+ }
+#endif
+ status = mount(specialfile, dir, filesystemtype, flags, string_flags);
+ if (status < 0 && errno == EROFS) {
+ error_msg("%s is write-protected, mounting read-only", specialfile);
+ status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
+ }
+ /* Don't whine about already mounted filesystems when mounting all. */
+ if (status < 0 && errno == EBUSY && mount_all)
+ return TRUE;
+ }
+
+
+ /* If the mount was sucessful, do anything needed, then return TRUE */
+ if (status == 0 || fakeIt==TRUE) {
+
+#if defined BB_FEATURE_MTAB_SUPPORT
+ if (useMtab == TRUE) {
+ erase_mtab(specialfile); // Clean any stale entries
+ write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
+ }
+#endif
+ return (TRUE);
+ }
+
+ /* Bummer. mount failed. Clean up */
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (lofile != NULL) {
+ del_loop(specialfile);
+ }
+#endif
+
+ if (errno == EPERM) {
+ error_msg_and_die("permission denied. Are you root?");
+ }
+
+ return (FALSE);
+}
+
+
+
+/* Seperate standard mount options from the nonstandard string options */
+static void
+parse_mount_options(char *options, int *flags, char *strflags)
+{
+ while (options) {
+ int gotone = FALSE;
+ char *comma = strchr(options, ',');
+ const struct mount_options *f = mount_options;
+
+ if (comma)
+ *comma = '\0';
+
+ while (f->name != 0) {
+ if (strcasecmp(f->name, options) == 0) {
+
+ *flags &= f->and;
+ *flags |= f->or;
+ gotone = TRUE;
+ break;
+ }
+ f++;
+ }
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
+ use_loop = TRUE;
+ gotone = TRUE;
+ }
+#endif
+ if (*strflags && strflags != '\0' && gotone == FALSE) {
+ char *temp = strflags;
+
+ temp += strlen(strflags);
+ *temp++ = ',';
+ *temp++ = '\0';
+ }
+ if (gotone == FALSE)
+ strcat(strflags, options);
+ if (comma) {
+ *comma = ',';
+ options = ++comma;
+ } else {
+ break;
+ }
+ }
+}
+
+static int
+mount_one(char *blockDevice, char *directory, char *filesystemType,
+ unsigned long flags, char *string_flags, int useMtab, int fakeIt,
+ char *mtab_opts, int whineOnErrors, int mount_all)
+{
+ int status = 0;
+
+ if (strcmp(filesystemType, "auto") == 0) {
+ static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", 0 };
+ const char **noauto_fstype;
+ const int num_of_filesystems = sysfs(3, 0, 0);
+ char buf[255];
+ int i=0;
+
+ filesystemType=buf;
+
+ while(i < num_of_filesystems) {
+ sysfs(2, i++, filesystemType);
+ for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
+ if (!strcmp(filesystemType, *noauto_fstype)) {
+ break;
+ }
+ }
+ if (!*noauto_fstype) {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags,
+ useMtab, fakeIt, mtab_opts, mount_all);
+ if (status == TRUE)
+ break;
+ }
+ }
+ } else {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts, mount_all);
+ }
+
+ if (status == FALSE) {
+ if (whineOnErrors == TRUE) {
+ perror_msg("Mounting %s on %s failed", blockDevice, directory);
+ }
+ return (FALSE);
+ }
+ return (TRUE);
+}
+
+void show_mounts()
+{
+#if defined BB_FEATURE_USE_DEVPS_PATCH
+ int fd, i, numfilesystems;
+ char device[] = "/dev/mtab";
+ struct k_mntent *mntentlist;
+
+ /* open device */
+ fd = open(device, O_RDONLY);
+ if (fd < 0)
+ perror_msg_and_die("open failed for `%s'", device);
+
+ /* How many mounted filesystems? We need to know to
+ * allocate enough space for later... */
+ numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
+ if (numfilesystems<0)
+ perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
+ mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
+
+ /* Grab the list of mounted filesystems */
+ if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
+ perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
+
+ for( i = 0 ; i < numfilesystems ; i++) {
+ printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
+ mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
+ mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
+ mntentlist[i].mnt_passno);
+ }
+#ifdef BB_FEATURE_CLEAN_UP
+ /* Don't bother to close files or free memory. Exit
+ * does that automagically, so we can save a few bytes */
+ free( mntentlist);
+ close(fd);
+#endif
+ exit(EXIT_SUCCESS);
+#else
+ FILE *mountTable = setmntent(mtab_file, "r");
+
+ if (mountTable) {
+ struct mntent *m;
+
+ while ((m = getmntent(mountTable)) != 0) {
+ char *blockDevice = m->mnt_fsname;
+ if (strcmp(blockDevice, "/dev/root") == 0) {
+ blockDevice = find_real_root_device_name(blockDevice);
+ }
+ printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
+ m->mnt_type, m->mnt_opts);
+#ifdef BB_FEATURE_CLEAN_UP
+ if(blockDevice != m->mnt_fsname)
+ free(blockDevice);
+#endif
+ }
+ endmntent(mountTable);
+ } else {
+ perror_msg_and_die("%s", mtab_file);
+ }
+ exit(EXIT_SUCCESS);
+#endif
+}
+
+extern int mount_main(int argc, char **argv)
+{
+ struct stat statbuf;
+ char string_flags_buf[1024] = "";
+ char *string_flags = string_flags_buf;
+ char *extra_opts = string_flags_buf;
+ int flags = 0;
+ char *filesystemType = "auto";
+ char *device = xmalloc(PATH_MAX);
+ char *directory = xmalloc(PATH_MAX);
+ int all = FALSE;
+ int fakeIt = FALSE;
+ int useMtab = TRUE;
+ int rc = EXIT_FAILURE;
+ int fstabmount = FALSE;
+ int opt;
+
+ /* Parse options */
+ while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
+ switch (opt) {
+ case 'o':
+ parse_mount_options(optarg, &flags, string_flags);
+ break;
+ case 'r':
+ flags |= MS_RDONLY;
+ break;
+ case 't':
+ filesystemType = optarg;
+ break;
+ case 'w':
+ flags &= ~MS_RDONLY;
+ break;
+ case 'a':
+ all = TRUE;
+ break;
+ case 'f':
+ fakeIt = TRUE;
+ break;
+#ifdef BB_FEATURE_MTAB_SUPPORT
+ case 'n':
+ useMtab = FALSE;
+ break;
+#endif
+ case 'v':
+ break; /* ignore -v */
+ }
+ }
+
+ if (!all && optind == argc)
+ show_mounts();
+
+ if (optind < argc) {
+ /* if device is a filename get its real path */
+ if (stat(argv[optind], &statbuf) == 0) {
+ realpath(argv[optind], device);
+ } else {
+ safe_strncpy(device, argv[optind], PATH_MAX);
+ }
+ }
+
+ if (optind + 1 < argc) {
+ if (realpath(argv[optind + 1], directory) == NULL) {
+ perror_msg_and_die("%s", directory);
+ }
+ }
+
+ if (all == TRUE || optind + 1 == argc) {
+ struct mntent *m = NULL;
+ FILE *f = setmntent("/etc/fstab", "r");
+ fstabmount = TRUE;
+
+ if (f == NULL)
+ perror_msg_and_die( "\nCannot read /etc/fstab");
+
+ while ((m = getmntent(f)) != NULL) {
+ if (all == FALSE && optind + 1 == argc && (
+ (strcmp(device, m->mnt_fsname) != 0) &&
+ (strcmp(device, m->mnt_dir) != 0) ) ) {
+ continue;
+ }
+
+ if (all == TRUE && ( // If we're mounting 'all'
+ (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
+ (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
+ (strstr(m->mnt_type, "nfs")) ) ) {
+ continue;
+ }
+
+ if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
+ flags = 0;
+ *string_flags = '\0';
+ parse_mount_options(m->mnt_opts, &flags, string_flags);
+ }
+
+ strcpy(device, m->mnt_fsname);
+ strcpy(directory, m->mnt_dir);
+ filesystemType = strdup(m->mnt_type);
+singlemount:
+ string_flags = strdup(string_flags);
+ rc = EXIT_SUCCESS;
+#ifdef BB_NFSMOUNT
+ if (strchr(device, ':') != NULL)
+ filesystemType = "nfs";
+ if (strcmp(filesystemType, "nfs") == 0) {
+ if (nfsmount (device, directory, &flags, &extra_opts,
+ &string_flags, 1)) {
+ perror_msg("nfsmount failed");
+ rc = EXIT_FAILURE;
+ }
+ }
+#endif
+ if (!mount_one(device, directory, filesystemType, flags,
+ string_flags, useMtab, fakeIt, extra_opts, TRUE, all))
+ rc = EXIT_FAILURE;
+
+ if (all == FALSE)
+ break;
+ }
+ if (fstabmount == TRUE)
+ endmntent(f);
+
+ if (all == FALSE && fstabmount == TRUE && m == NULL)
+ fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
+
+ return rc;
+ }
+
+ goto singlemount;
+}
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