735 lines
18 KiB
C
735 lines
18 KiB
C
/*
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* A mount(8) for Linux 0.99.
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* mount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
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*
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* Thu Jul 14 07:32:40 1994: faith@cs.unc.edu added changed from Adam
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* J. Richter (adam@adam.yggdrasil.com) so that /proc/filesystems is used
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* if no -t option is given. I modified his patches so that, if
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* /proc/filesystems is not available, the behavior of mount is the same as
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* it was previously.
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*
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* Wed Sep 14 22:43:00 1994: Mitchum DSouza
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* (mitch@mrc-applied-psychology.cambridge.ac.uk) added support for mounting
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* the "loop" device.
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*
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* Wed Sep 14 22:55:10 1994: Sander van Malssen (svm@kozmix.hacktic.nl)
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* added support for remounting readonly file systems readonly.
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*
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* Wed Feb 8 09:23:18 1995: Mike Grupenhoff <kashmir@umiacs.UMD.EDU> added
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* a probe of the superblock for the type before /proc/filesystems is
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* checked.
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*
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* Wed Feb 8 12:27:00 1995: Andries.Brouwer@cwi.nl fixed up error messages.
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*
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*/
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#include "sundries.h"
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#include <linux/fs.h>
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#include <linux/minix_fs.h>
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#include <linux/ext_fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/xia_fs.h>
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#include <sys/stat.h>
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#include <unistd.h>
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int del_loop (const char *);
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/* True for fake mount (-f). */
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int fake = 0;
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/* Don't write a entry in /etc/mtab (-n). */
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int nomtab = 0;
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/* True for readonly (-r). */
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int readonly = 0;
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/* Nonzero for chatty (-v). */
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int verbose = 0;
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/* True for read/write (-w). */
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int readwrite = 0;
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/* True for all mount (-a). */
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int all = 0;
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/* True if ruid != euid. */
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int suid = 0;
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/* Map from -o and fstab option strings to the flag argument to mount(2). */
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struct opt_map
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{
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const char *opt; /* option name */
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int inv; /* true if flag value should be inverted */
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int mask; /* flag mask value */
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};
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/* Custom mount options for our own purposes. */
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#define MS_NOAUTO 0x80000000
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#define MS_USER 0x40000000
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/* Options that we keep the mount system call from seeing. */
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#define MS_NOSYS (MS_NOAUTO|MS_USER)
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/* Options that we keep from appearing in the options field in the mtab. */
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#define MS_NOMTAB (MS_REMOUNT|MS_NOAUTO|MS_USER)
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/* OPTIONS that we make ordinary users have by default. */
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#define MS_SECURE (MS_NOEXEC|MS_NOSUID|MS_NODEV)
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const struct opt_map opt_map[] =
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{
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{ "defaults", 0, 0 }, /* default options */
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{ "ro", 0, MS_RDONLY }, /* read-only */
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{ "rw", 1, MS_RDONLY }, /* read-write */
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{ "exec", 1, MS_NOEXEC }, /* permit execution of binaries */
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{ "noexec", 0, MS_NOEXEC }, /* don't execute binaries */
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{ "suid", 1, MS_NOSUID }, /* honor suid executables */
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{ "nosuid", 0, MS_NOSUID }, /* don't honor suid executables */
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{ "dev", 1, MS_NODEV }, /* interpret device files */
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{ "nodev", 0, MS_NODEV }, /* don't interpret devices */
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{ "sync", 0, MS_SYNCHRONOUS}, /* synchronous I/O */
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{ "async", 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
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{ "remount", 0, MS_REMOUNT }, /* Alter flags of mounted FS */
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{ "auto", 1, MS_NOAUTO }, /* Can be mounted using -a */
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{ "noauto", 0, MS_NOAUTO }, /* Can only be mounted explicitly */
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{ "user", 0, MS_USER }, /* Allow ordinary user to mount */
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{ "nouser", 1, MS_USER }, /* Forbid ordinary user to mount */
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/* add new options here */
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#ifdef MS_NOSUB
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{ "sub", 1, MS_NOSUB }, /* allow submounts */
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{ "nosub", 0, MS_NOSUB }, /* don't allow submounts */
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#endif
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{ NULL, 0, 0 }
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};
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/* Report on a single mount. */
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static void
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print_one (const struct mntent *mnt)
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{
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printf ("%s on %s", mnt->mnt_fsname, mnt->mnt_dir);
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if ((mnt->mnt_type != NULL) && *mnt->mnt_type != '\0')
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printf (" type %s", mnt->mnt_type);
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if (mnt->mnt_opts != NULL)
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printf (" (%s)", mnt->mnt_opts);
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printf ("\n");
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}
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/* Report on everything in mtab (of the specified types if any). */
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static int
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print_all (string_list types)
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{
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struct mntent *mnt;
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open_mtab ("r");
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while ((mnt = getmntent (F_mtab)) != NULL)
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if (matching_type (mnt->mnt_type, types))
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print_one (mnt);
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if (ferror (F_mtab))
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die (1, "mount: error reading %s: %s", MOUNTED, strerror (errno));
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exit (0);
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}
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/* Look for OPT in opt_map table and return mask value. If OPT isn't found,
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tack it onto extra_opts. */
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static inline void
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parse_opt (const char *opt, int *mask, char *extra_opts)
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{
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const struct opt_map *om;
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for (om = opt_map; om->opt != NULL; om++)
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if (streq (opt, om->opt))
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{
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if (om->inv)
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*mask &= ~om->mask;
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else
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*mask |= om->mask;
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if (om->mask == MS_USER)
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*mask |= MS_SECURE;
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return;
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}
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if (*extra_opts)
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strcat(extra_opts, ",");
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strcat(extra_opts, opt);
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}
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/* Take -o options list and compute 4th and 5th args to mount(2). flags
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gets the standard options and extra_opts anything we don't recognize. */
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static void
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parse_opts (char *opts, int *flags, char **extra_opts)
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{
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char *opt;
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*flags = 0;
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*extra_opts = NULL;
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if (opts != NULL)
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{
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*extra_opts = xmalloc (strlen (opts) + 1);
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**extra_opts = '\0';
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for (opt = strtok (opts, ",");
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opt != NULL;
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opt = strtok (NULL, ","))
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parse_opt (opt, flags, *extra_opts);
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}
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if (readonly)
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*flags |= MS_RDONLY;
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if (readwrite)
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*flags &= ~MS_RDONLY;
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}
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/* Try to build a canonical options string. */
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static char *
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fix_opts_string (int flags, char *extra_opts)
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{
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const struct opt_map *om;
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char *new_opts;
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char *tmp;
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new_opts = (flags & MS_RDONLY) ? "ro" : "rw";
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for (om = opt_map; om->opt != NULL; om++)
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{
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if (om->mask & MS_RDONLY)
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continue;
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if (om->inv || !om->mask || (flags & om->mask) != om->mask)
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continue;
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tmp = xmalloc(strlen(new_opts) + strlen(om->opt) + 2);
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sprintf(tmp, "%s,%s", new_opts, om->opt);
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new_opts = tmp;
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flags &= ~om->mask;
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}
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if (extra_opts && *extra_opts)
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{
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tmp = xmalloc(strlen(new_opts) + strlen(extra_opts) + 2);
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sprintf(tmp, "%s,%s", new_opts, extra_opts);
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new_opts = tmp;
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}
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return new_opts;
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}
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/*
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char *fstype(const char *device);
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probes the device and attempts to determine the type of filesystem
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contained within.
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Original routine by <jmorriso@bogomips.ww.ubc.ca>; made into a function
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for mount(8) by Mike Grupenhoff <kashmir@umiacs.umd.edu>.
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Currently supports: minix, ext, ext2, xia
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*/
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static char *
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fstype(const char *device)
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{
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int fd;
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/* MINIX */
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struct minix_super_block ms;
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/* extended fs */
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struct ext_super_block es;
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/* 2nd extended fs */
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struct ext2_super_block e2s;
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/* xia fs */
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struct xiafs_super_block xfs;
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fd = open(device, O_RDONLY);
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if (fd < 0) {
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perror(device);
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return 0;
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}
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lseek(fd, BLOCK_SIZE, SEEK_SET);
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read(fd, (char *) &ms, sizeof(ms));
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if (ms.s_magic == MINIX_SUPER_MAGIC || ms.s_magic == MINIX_SUPER_MAGIC2) {
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close(fd);
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return("minix");
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}
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lseek(fd, BLOCK_SIZE, SEEK_SET);
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read(fd, (char *) &es, sizeof(es));
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if (es.s_magic == EXT_SUPER_MAGIC) {
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close(fd);
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return("ext");
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}
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lseek(fd, BLOCK_SIZE, SEEK_SET);
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read(fd, (char *) &e2s, sizeof(e2s));
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if (e2s.s_magic == EXT2_SUPER_MAGIC || e2s.s_magic == EXT2_PRE_02B_MAGIC) {
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close(fd);
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return("ext2");
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}
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lseek(fd, 0, SEEK_SET);
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read(fd, (char *) &xfs, sizeof(xfs));
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if (xfs.s_magic == _XIAFS_SUPER_MAGIC) {
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close(fd);
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return("xiafs");
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}
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close(fd);
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return(0);
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}
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/* Mount a single file system. Return status,
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so don't exit on non-fatal errors. */
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static int
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try_mount5 (char *spec, char *node, char **type, int flags, char *mount_opts) {
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FILE *procfs_file;
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char line[100];
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char fsname[50];
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if (*type) return mount5 (spec, node, *type, flags & ~MS_NOSYS, mount_opts);
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if (( procfs_file = fopen("/proc/filesystems", "r")) == NULL) {
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/* If /proc/filesystems is not available,
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preserve the old behavior of mount. */
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return mount5 (spec,
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node,
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FSTYPE_DEFAULT,
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flags & ~MS_NOSYS, mount_opts);
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}
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while (fgets(line, sizeof(line), procfs_file)) {
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if (sscanf (line, "nodev %[^\n]\n", fsname) == 1) continue;
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if (sscanf (line, " %[^ \n]\n", fsname) != 1) continue;
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if (mount5 (spec, node, fsname, flags & ~MS_NOSYS, mount_opts) == 0) {
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*type=xstrdup(fsname);
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fclose(procfs_file);
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return 0;
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}
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}
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fclose(procfs_file);
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return -1;
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}
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static int
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mount_one (char *spec, char *node, char *type, char *opts, int freq, int pass)
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{
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struct mntent mnt;
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int mnt_err;
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int flags;
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char *extra_opts;
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char *mount_opts;
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int anti_recurse = 0;
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int loop=0;
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if (type == NULL)
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{
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if (strchr (spec, ':') != NULL)
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type = "nfs";
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}
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parse_opts (xstrdup (opts), &flags, &extra_opts);
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/* root may allow certain types of mounts by ordinary users */
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if (suid && !(flags & MS_USER))
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die (3, "mount: only root can mount %s on %s", spec, node);
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/* quietly succeed for fstab entries that don't get mounted automatically */
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if (all && (flags & MS_NOAUTO))
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return 0;
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mount_opts = extra_opts;
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if (!fake && type && strncmp("lo@", type, 3)==0) {
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extern int lomount (char *, char *, char *, char **,
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int *, char **, char **);
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char *dev=type+3;
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loop=1;
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if (lomount (spec, node, dev, &type,
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&flags, &opts, &mount_opts) != 0)
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return 1;
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spec=dev;
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mount_opts=NULL;
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}
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if (!fake && type && streq (type, "nfs"))
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#ifdef HAVE_NFS
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if (nfsmount (spec, node, &flags, &extra_opts, &mount_opts) != 0)
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return 1;
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#else
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die (1, "mount: this version doesn't support the type `nfs'");
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#endif
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if (!type && !(type = fstype(spec)))
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return 1;
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block_signals (SIG_BLOCK);
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if (fake
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|| (try_mount5 (spec, node, &type, flags & ~MS_NOSYS, mount_opts)) == 0)
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/* Mount succeeded, write mtab entry. */
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{
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if (!nomtab)
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{
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mnt.mnt_fsname = canonicalize (spec);
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mnt.mnt_dir = canonicalize (node);
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mnt.mnt_type = loop?"loop":type;
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mnt.mnt_opts = fix_opts_string (flags & ~MS_NOMTAB,
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loop?opts:extra_opts);
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mnt.mnt_freq = freq;
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mnt.mnt_passno = pass;
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/* We get chatty now rather than after the update to mtab since the
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mount succeeded, even if the write to /etc/mtab should fail. */
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if (verbose)
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print_one (&mnt);
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if (flags & MS_REMOUNT)
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{
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close_mtab ();
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update_mtab (mnt.mnt_dir, &mnt);
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open_mtab ("a+");
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}
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else
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if ((addmntent (F_mtab, &mnt)) == 1)
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die (1, "mount: error writing %s: %s",
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MOUNTED, strerror (errno));
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}
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block_signals (SIG_UNBLOCK);
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return 0;
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}
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if (loop)
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del_loop(spec);
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mnt_err = errno; /* work around for errno bug in sigprocmask */
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block_signals (SIG_UNBLOCK);
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/* Mount failed, complain, but don't die. */
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switch (mnt_err)
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{
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case EPERM:
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if (geteuid() == 0)
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error ("mount: mount point %s is not a directory", node);
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else
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error ("mount: must be superuser to use mount");
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break;
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case EBUSY:
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error ("mount: %s already mounted or %s busy", spec, node);
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break;
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case ENOENT:
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{ struct stat statbuf;
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if (stat (node, &statbuf))
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error ("mount: mount point %s does not exist", node);
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else if (stat (spec, &statbuf))
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error ("mount: special device %s does not exist", spec);
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else {
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errno = mnt_err;
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perror("mount");
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}
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break;
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}
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case ENOTDIR:
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error ("mount: mount point %s is not a directory", node); break;
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case EINVAL:
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error ("mount: wrong fs type or bad superblock on %s", spec); break;
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case EMFILE:
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error ("mount table full"); break;
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case EIO:
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error ("mount: %s: can't read superblock", spec); break;
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case ENODEV:
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error ("mount: fs type %s not supported by kernel", type); break;
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case ENOTBLK:
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error ("mount: %s is not a block device", spec); break;
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case ENXIO:
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error ("mount: %s is not a valid block device", spec); break;
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case EACCES: /* pre-linux 1.1.38 */
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case EROFS: /* linux 1.1.38 and later */
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if (anti_recurse)
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{
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error ("mount: block device %s is not permitted on its filesystem", spec);
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break;
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}
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else
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{
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anti_recurse++;
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if (opts)
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{
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opts = realloc(xstrdup(opts), strlen(opts)+3);
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strcat(opts, ",ro");
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}
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else
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opts = "ro";
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error ("mount: block device %s is write-protected, mounting read-only", spec);
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return mount_one (spec, node, type, opts, freq, pass);
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}
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break;
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default:
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error ("mount: %s", strerror (mnt_err)); break;
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}
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return 1;
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}
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/* Check if an fsname/dir pair was already in the old mtab. */
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static int
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mounted (char *spec, char *node, string_list spec_list, string_list node_list)
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{
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spec = canonicalize (spec);
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node = canonicalize (node);
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while (spec_list != NULL)
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{
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if (streq (spec, car (spec_list)) && streq (node, car (node_list)))
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return 1;
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spec_list = cdr (spec_list);
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node_list = cdr (node_list);
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}
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return 0;
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}
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/* Mount all filesystems of the specified types except swap and root. */
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static int
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mount_all (string_list types)
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{
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struct mntent *fstab;
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struct mntent *mnt;
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string_list spec_list = NULL;
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string_list node_list = NULL;
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int status;
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rewind (F_mtab);
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while ((mnt = getmntent (F_mtab)))
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if (matching_type (mnt->mnt_type, types)
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&& !streq (mnt->mnt_dir, "/")
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&& !streq (mnt->mnt_dir, "root"))
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{
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spec_list = cons (xstrdup (mnt->mnt_fsname), spec_list);
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node_list = cons (xstrdup (mnt->mnt_dir), node_list);
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}
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status = 0;
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while ((fstab = getfsent ()) != NULL)
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if (matching_type (fstab->mnt_type, types)
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&& !streq (fstab->mnt_dir, "/")
|
|
&& !streq (fstab->mnt_dir, "root"))
|
|
if (mounted (fstab->mnt_fsname, fstab->mnt_dir, spec_list, node_list))
|
|
{
|
|
if (verbose)
|
|
printf("mount: %s already mounted on %s\n",
|
|
fstab->mnt_fsname, fstab->mnt_dir);
|
|
}
|
|
else
|
|
status |= mount_one (fstab->mnt_fsname, fstab->mnt_dir,
|
|
fstab->mnt_type, fstab->mnt_opts,
|
|
fstab->mnt_freq, fstab->mnt_passno);
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Create mtab with a root entry. */
|
|
static void
|
|
create_mtab (void)
|
|
{
|
|
struct mntent *fstab;
|
|
struct mntent mnt;
|
|
int flags;
|
|
char *extra_opts;
|
|
|
|
if ((F_mtab = setmntent (MOUNTED, "a+")) == NULL)
|
|
die (1, "mount: can't open %s for writing: %s", MOUNTED, strerror (errno));
|
|
|
|
/* Find the root entry by looking it up in fstab, which might be wrong.
|
|
We could statfs "/" followed by a slew of stats on /dev/ but then
|
|
we'd have to unparse the mount options as well.... */
|
|
if ((fstab = getfsfile ("/")) || (fstab = getfsfile ("root")))
|
|
{
|
|
parse_opts (xstrdup (fstab->mnt_opts), &flags, &extra_opts);
|
|
mnt = *fstab;
|
|
mnt.mnt_fsname = canonicalize (fstab->mnt_fsname);
|
|
mnt.mnt_dir = "/";
|
|
mnt.mnt_opts = fix_opts_string (flags, extra_opts);
|
|
|
|
if (addmntent (F_mtab, &mnt) == 1)
|
|
die (1, "mount: error writing %s: %s", MOUNTED, strerror (errno));
|
|
}
|
|
if (fchmod (fileno (F_mtab), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0)
|
|
die (1, "mount: error changing mode of %s: %s", MOUNTED, strerror (errno));
|
|
endmntent (F_mtab);
|
|
}
|
|
|
|
extern char version[];
|
|
static struct option longopts[] =
|
|
{
|
|
{ "all", 0, 0, 'a' },
|
|
{ "fake", 0, 0, 'f' },
|
|
{ "help", 0, 0, 'h' },
|
|
{ "no-mtab", 0, 0, 'n' },
|
|
{ "read-only", 0, 0, 'r' },
|
|
{ "ro", 0, 0, 'r' },
|
|
{ "verbose", 0, 0, 'v' },
|
|
{ "version", 0, 0, 'V' },
|
|
{ "read-write", 0, 0, 'w' },
|
|
{ "rw", 0, 0, 'w' },
|
|
{ "options", 1, 0, 'o' },
|
|
{ "types", 1, 0, 't' },
|
|
{ NULL, 0, 0, 0 }
|
|
};
|
|
|
|
const char *usage_string = "\
|
|
usage: mount [-hV]\n\
|
|
mount -a [-nfrvw] [-t vfstypes]\n\
|
|
mount [-nfrvw] [-o options] special | node\n\
|
|
mount [-nfrvw] [-t vfstype] [-o options] special node\n\
|
|
";
|
|
|
|
static void
|
|
usage (FILE *fp, int n)
|
|
{
|
|
fprintf (fp, "%s", usage_string);
|
|
exit (n);
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
int c;
|
|
char *options = NULL;
|
|
string_list types = NULL;
|
|
struct mntent *fs;
|
|
char *spec;
|
|
int result = 0;
|
|
struct stat statbuf;
|
|
|
|
while ((c = getopt_long (argc, argv, "afhnrvVwt:o:", longopts, NULL)) != EOF)
|
|
switch (c)
|
|
{
|
|
case 'a': /* mount everything in fstab */
|
|
++all;
|
|
break;
|
|
case 'f': /* fake (don't actually do mount(2) call) */
|
|
++fake;
|
|
break;
|
|
case 'h': /* help */
|
|
usage (stdout, 0);
|
|
break;
|
|
case 'n': /* mount without writing in /etc/mtab */
|
|
++nomtab;
|
|
break;
|
|
case 'r': /* mount readonly */
|
|
++readonly;
|
|
readwrite = 0;
|
|
break;
|
|
case 'v': /* be chatty */
|
|
++verbose;
|
|
break;
|
|
case 'V': /* version */
|
|
printf ("%s\n", version);
|
|
exit (0);
|
|
case 'w': /* mount read/write */
|
|
++readwrite;
|
|
readonly = 0;
|
|
break;
|
|
case 't': /* specify file system types */
|
|
types = parse_list (optarg);
|
|
break;
|
|
case 'o': /* specify mount options */
|
|
options = optarg;
|
|
break;
|
|
case 0:
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage (stderr, 1);
|
|
break;
|
|
}
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc == 0)
|
|
{
|
|
if (options)
|
|
usage (stderr, 1);
|
|
if (!all)
|
|
return print_all (types);
|
|
}
|
|
|
|
if (getuid () != geteuid ())
|
|
{
|
|
suid = 1;
|
|
if (types || options || readwrite || nomtab || all || fake || argc != 1)
|
|
die (2, "mount: only root can do that");
|
|
}
|
|
|
|
if (!nomtab)
|
|
{
|
|
lock_mtab ();
|
|
if (stat(MOUNTED, &statbuf) < 0)
|
|
create_mtab ();
|
|
open_mtab ("a+");
|
|
}
|
|
else if (stat(MOUNTED, &statbuf) >= 0)
|
|
open_mtab ("r");
|
|
|
|
|
|
switch (argc)
|
|
{
|
|
case 0:
|
|
/* mount -a */
|
|
result = mount_all (types);
|
|
break;
|
|
|
|
case 1:
|
|
/* mount [-nfrvw] [-o options] special | node */
|
|
if (types != NULL)
|
|
usage (stderr, 1);
|
|
/* Try to find the other pathname in fstab. */
|
|
spec = canonicalize (*argv);
|
|
if (!(fs = getmntfile (spec))
|
|
&& !(fs = getfsspec (spec)) && !(fs = getfsfile (spec)))
|
|
die (2, "mount: can't find %s in %s or %s",
|
|
spec, MOUNTED, _PATH_FSTAB);
|
|
/* Merge the fstab and command line options. */
|
|
if (options == NULL)
|
|
options = fs->mnt_opts;
|
|
else
|
|
{
|
|
char *tmp = xmalloc(strlen(fs->mnt_opts) + strlen(options) + 2);
|
|
|
|
sprintf (tmp, "%s,%s", fs->mnt_opts, options);
|
|
options = tmp;
|
|
}
|
|
result = mount_one (xstrdup (fs->mnt_fsname), xstrdup (fs->mnt_dir),
|
|
xstrdup (fs->mnt_type), options,
|
|
fs->mnt_freq, fs->mnt_passno);
|
|
break;
|
|
|
|
case 2:
|
|
/* mount [-nfrvw] [-t vfstype] [-o options] special node */
|
|
if (types == NULL)
|
|
result = mount_one (argv[0], argv[1], NULL, options, 0, 0);
|
|
else if (cdr (types) == NULL)
|
|
result = mount_one (argv[0], argv[1], car (types), options, 0, 0);
|
|
else
|
|
usage (stderr, 2);
|
|
break;
|
|
|
|
default:
|
|
usage (stderr, 2);
|
|
}
|
|
|
|
if (!nomtab)
|
|
{
|
|
endmntent (F_mtab);
|
|
unlock_mtab ();
|
|
}
|
|
|
|
exit (result);
|
|
}
|