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/*
* mount.c -- Linux NFS mount
*
* Copyright (C) 2006 Amit Gud <agud@redhat.com>
*
* - Basic code and wrapper around mount and umount code of NFS.
* Based on util-linux/mount/mount.c.
*
* 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, 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.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <getopt.h>
#include <mntent.h>
#include <pwd.h>
#include "fstab.h"
#include "xcommon.h"
#include "nls.h"
#include "mount_constants.h"
#include "mount_config.h"
#include "nfs_paths.h"
#include "nfs_mntent.h"
#include "nfs_mount.h"
#include "nfs4_mount.h"
#include "mount.h"
#include "error.h"
#include "stropts.h"
#include "utils.h"
char *progname;
int nfs_mount_data_version;
int nomtab;
int verbose;
int sloppy;
int string;
#define FOREGROUND (0)
#define BACKGROUND (1)
static struct option longopts[] = {
{ "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' },
{ NULL, 0, 0, 0 }
};
/*
* Map from -o and fstab option strings to the flag argument to mount(2).
*/
struct opt_map {
const char *opt; /* option name */
int skip; /* skip in mtab option string */
int inv; /* true if flag value should be inverted */
int mask; /* flag mask value */
};
static const struct opt_map opt_map[] = {
{ "defaults", 0, 0, 0 }, /* default options */
{ "ro", 1, 0, MS_RDONLY }, /* read-only */
{ "rw", 1, 1, MS_RDONLY }, /* read-write */
{ "exec", 0, 1, MS_NOEXEC }, /* permit execution of binaries */
{ "noexec", 0, 0, MS_NOEXEC }, /* don't execute binaries */
{ "suid", 0, 1, MS_NOSUID }, /* honor suid executables */
{ "nosuid", 0, 0, MS_NOSUID }, /* don't honor suid executables */
{ "dev", 0, 1, MS_NODEV }, /* interpret device files */
{ "nodev", 0, 0, MS_NODEV }, /* don't interpret devices */
{ "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */
{ "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
{ "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */
{ "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */
{ "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */
{ "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */
{ "auto", 0, 0, MS_DUMMY }, /* Can be mounted using -a */
{ "noauto", 0, 0, MS_DUMMY }, /* Can only be mounted explicitly */
{ "users", 1, 0, MS_USERS }, /* Allow ordinary user to mount */
{ "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
{ "user", 1, 0, MS_USER }, /* Allow ordinary user to mount */
{ "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
{ "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */
{ "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */
{ "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */
{ "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */
{ "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */
{ "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/
/* add new options here */
#ifdef MS_NOSUB
{ "sub", 0, 1, MS_NOSUB }, /* allow submounts */
{ "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
#endif
#ifdef MS_SILENT
{ "quiet", 0, 0, MS_SILENT }, /* be quiet */
{ "loud", 0, 1, MS_SILENT }, /* print out messages. */
#endif
#ifdef MS_MANDLOCK
{ "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
{ "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
#endif
{ "loop", 1, 0, MS_DUMMY }, /* use a loop device */
#ifdef MS_NOATIME
{ "atime", 0, 1, MS_NOATIME }, /* Update access time */
{ "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
#endif
#ifdef MS_NODIRATIME
{ "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
{ "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
#endif
#ifdef MS_RELATIME
{ "relatime", 0, 0, MS_RELATIME }, /* Update access times relative to
mtime/ctime */
{ "norelatime", 0, 1, MS_RELATIME }, /* Update access time without regard
to mtime/ctime */
#endif
{ "noquota", 0, 0, MS_DUMMY }, /* Don't enforce quota */
{ "quota", 0, 0, MS_DUMMY }, /* Enforce user quota */
{ "usrquota", 0, 0, MS_DUMMY }, /* Enforce user quota */
{ "grpquota", 0, 0, MS_DUMMY }, /* Enforce group quota */
{ NULL, 0, 0, 0 }
};
static void parse_opts(const char *options, int *flags, char **extra_opts);
/*
* Build a canonical mount option string for /etc/mtab.
*/
static char *fix_opts_string(int flags, const char *extra_opts)
{
const struct opt_map *om;
char *new_opts;
new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
if (flags & MS_USER) {
/* record who mounted this so they can unmount */
struct passwd *pw = getpwuid(getuid());
if(pw)
new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name);
}
if (flags & MS_USERS)
new_opts = xstrconcat3(new_opts, ",users", "");
for (om = opt_map; om->opt != NULL; om++) {
if (om->skip)
continue;
if (om->inv || !om->mask || (flags & om->mask) != om->mask)
continue;
new_opts = xstrconcat3(new_opts, ",", om->opt);
flags &= ~om->mask;
}
if (extra_opts && *extra_opts) {
new_opts = xstrconcat3(new_opts, ",", extra_opts);
}
return new_opts;
}
static void
init_mntent(struct mntent *mnt, char *fsname, char *dir, char *type,
int flags, char *opts)
{
mnt->mnt_fsname = fsname;
mnt->mnt_dir = dir;
mnt->mnt_type = type;
mnt->mnt_opts = fix_opts_string(flags & ~MS_NOMTAB, opts);
/* these are always zero for NFS */
mnt->mnt_freq = 0;
mnt->mnt_passno = 0;
}
/* Create mtab with a root entry. */
static void
create_mtab (void) {
struct mntentchn *fstab;
struct mntent mnt;
int flags;
mntFILE *mfp;
/* Avoid writing if the mtab is a symlink to /proc/mounts, since
that would create a file /proc/mounts in case the proc filesystem
is not mounted, and the fchmod below would also fail. */
if (mtab_is_a_symlink()) {
return EX_SUCCESS;
}
lock_mtab();
mfp = nfs_setmntent (MOUNTED, "a+");
if (mfp == NULL || mfp->mntent_fp == NULL) {
int errsv = errno;
die (EX_FILEIO, _("mount: can't open %s for writing: %s"),
MOUNTED, strerror (errsv));
}
/* Find the root entry by looking it up in fstab */
if ((fstab = getfsfile ("/")) || (fstab = getfsfile ("root"))) {
char *extra_opts;
parse_opts (fstab->m.mnt_opts, &flags, &extra_opts);
init_mntent(&mnt, xstrdup(fstab->m.mnt_fsname), "/",
fstab->m.mnt_type, flags, extra_opts);
free(extra_opts);
if (nfs_addmntent (mfp, &mnt) == 1) {
int errsv = errno;
die (EX_FILEIO, _("mount: error writing %s: %s"),
_PATH_MOUNTED, strerror (errsv));
}
}
if (fchmod (fileno (mfp->mntent_fp), 0644) < 0)
if (errno != EROFS) {
int errsv = errno;
die (EX_FILEIO,
_("mount: error changing mode of %s: %s"),
_PATH_MOUNTED, strerror (errsv));
}
nfs_endmntent (mfp);
unlock_mtab();
reset_mtab_info();
}
static int add_mtab(char *spec, char *mount_point, char *fstype,
int flags, char *opts)
{
struct mntent ment;
int result = EX_SUCCESS;
init_mntent(&ment, spec, mount_point, fstype, flags, opts);
if (!nomtab && mtab_does_not_exist()) {
if (verbose > 1)
printf(_("mount: no %s found - creating it..\n"),
MOUNTED);
create_mtab ();
}
if (!nomtab && mtab_is_writable()) {
if (flags & MS_REMOUNT)
update_mtab(ment.mnt_dir, &ment);
else {
mntFILE *mtab;
lock_mtab();
mtab = nfs_setmntent(MOUNTED, "a+");
if (mtab == NULL || mtab->mntent_fp == NULL) {
nfs_error(_("Can't open mtab: %s"),
strerror(errno));
result = EX_FILEIO;
} else {
if (nfs_addmntent(mtab, &ment) == 1) {
nfs_error(_("Can't write mount entry to mtab: %s"),
strerror(errno));
result = EX_FILEIO;
}
}
nfs_endmntent(mtab);
unlock_mtab();
}
}
free(ment.mnt_opts);
return result;
}
static void parse_opt(const char *opt, int *mask, char *extra_opts, size_t len)
{
const struct opt_map *om;
for (om = opt_map; om->opt != NULL; om++) {
if (!strcmp (opt, om->opt)) {
if (om->inv)
*mask &= ~om->mask;
else
*mask |= om->mask;
return;
}
}
len -= strlen(extra_opts);
if (*extra_opts && --len > 0)
strcat(extra_opts, ",");
if ((len -= strlen(opt)) > 0)
strcat(extra_opts, opt);
}
/*
* Convert the provided mount command-line options into the 4th &
* 5th arguments to mount(2). Output parameter "@flags" gets the
* standard options (indicated by MS_ bits), and output parameter
* "@extra_opts" gets all the filesystem-specific options.
*/
static void parse_opts(const char *options, int *flags, char **extra_opts)
{
if (options != NULL) {
char *opts = xstrdup(options);
char *opt, *p;
size_t len = strlen(opts) + 1; /* include room for a null */
int open_quote = 0;
*extra_opts = xmalloc(len);
**extra_opts = '\0';
for (p = opts, opt = NULL; p && *p; p++) {
if (!opt)
opt = p; /* begin of the option item */
if (*p == '"')
open_quote ^= 1; /* reverse the status */
if (open_quote)
continue; /* still in a quoted block */
if (*p == ',')
*p = '\0'; /* terminate the option item */
/* end of option item or last item */
if (*p == '\0' || *(p + 1) == '\0') {
parse_opt(opt, flags, *extra_opts, len);
opt = NULL;
}
}
free(opts);
}
}
static int try_mount(char *spec, char *mount_point, int flags,
char *fs_type, char **extra_opts, char *mount_opts,
int fake, int bg)
{
int ret;
if (string)
ret = nfsmount_string(spec, mount_point, fs_type, flags,
extra_opts, fake, bg);
else {
if (strcmp(fs_type, "nfs4") == 0)
ret = nfs4mount(spec, mount_point, flags,
extra_opts, fake, bg);
else
ret = nfsmount(spec, mount_point, flags,
extra_opts, fake, bg);
}
if (ret)
return ret;
if (!fake)
print_one(spec, mount_point, fs_type, mount_opts);
return add_mtab(spec, mount_point, fs_type, flags, *extra_opts);
}
int main(int argc, char *argv[])
{
int c, flags = 0, mnt_err = 1, fake = 0;
char *spec = NULL, *mount_point = NULL, *fs_type = "nfs";
char *extra_opts = NULL, *mount_opts = NULL;
uid_t uid = getuid();
progname = basename(argv[0]);
nfs_mount_data_version = discover_nfs_mount_data_version(&string);
if(!strncmp(progname, "umount", strlen("umount")))
exit(nfsumount(argc, argv));
if ((argc < 3)) {
mount_usage();
exit(EX_USAGE);
}
mount_config_init(progname);
while ((c = getopt_long(argc, argv, "rvVwfno:hs",
longopts, NULL)) != -1) {
switch (c) {
case 'r':
flags |= MS_RDONLY;
break;
case 'v':
++verbose;
break;
case 'V':
printf("%s: ("PACKAGE_STRING")\n", progname);
exit(EX_SUCCESS);
case 'w':
flags &= ~MS_RDONLY;
break;
case 'f':
++fake;
break;
case 'n':
++nomtab;
break;
case 'o': /* specify mount options */
if (mount_opts)
mount_opts = xstrconcat3(mount_opts, ",", optarg);
else
mount_opts = xstrdup(optarg);
break;
case 's':
++sloppy;
break;
case 'h':
default:
mount_usage();
goto out_usage;
}
}
/*
* Extra non-option words at the end are bogus...
*/
if (optind != argc - 2) {
mount_usage();
goto out_usage;
} else {
while (optind < argc) {
if (!spec)
spec = argv[optind];
else
mount_point = argv[optind];
optind++;
}
}
if (strcmp(progname, "mount.nfs4") == 0)
fs_type = "nfs4";
/*
* If a non-root user is attempting to mount, make sure the
* user's requested options match the options specified in
* /etc/fstab; otherwise, don't allow the mount.
*/
if (uid != 0) {
struct mntentchn *mc;
if ((mc = getfsfile(mount_point)) == NULL ||
strcmp(mc->m.mnt_fsname, spec) != 0 ||
strcmp(mc->m.mnt_type, fs_type) != 0) {
nfs_error(_("%s: permission denied: no match for %s "
"found in /etc/fstab"), progname, mount_point);
goto out_usage;
}
/*
* 'mount' munges the options from fstab before passing them
* to us, so it is non-trivial to test that we have the correct
* set of options and we don't want to trust what the user
* gave us, so just take whatever is in /etc/fstab.
*/
mount_opts = strdup(mc->m.mnt_opts);
}
mount_point = canonicalize(mount_point);
if (!mount_point) {
nfs_error(_("%s: no mount point provided"), progname);
goto out_usage;
}
if (mount_point[0] != '/') {
nfs_error(_("%s: unrecognized mount point %s"),
progname, mount_point);
mnt_err = EX_USAGE;
goto out;
}
/*
* Concatenate mount options from the configuration file
*/
mount_opts = mount_config_opts(spec, mount_point, mount_opts);
parse_opts(mount_opts, &flags, &extra_opts);
if (uid != 0) {
if (!(flags & (MS_USERS|MS_USER))) {
nfs_error(_("%s: permission denied"), progname);
mnt_err = EX_USAGE;
goto out;
}
if (geteuid() != 0) {
nfs_error(_("%s: not installed setuid - "
"\"user\" NFS mounts not supported."), progname);
exit(EX_FAIL);
}
}
if (chk_mountpoint(mount_point)) {
mnt_err = EX_USAGE;
goto out;
}
mnt_err = try_mount(spec, mount_point, flags, fs_type, &extra_opts,
mount_opts, fake, FOREGROUND);
if (mnt_err == EX_BG) {
printf(_("%s: backgrounding \"%s\"\n"),
progname, spec);
printf(_("%s: mount options: \"%s\"\n"),
progname, extra_opts);
fflush(stdout);
/*
* Parent exits immediately with success.
*/
if (daemon(0, 0)) {
nfs_error(_("%s: failed to start "
"background process: %s\n"),
progname, strerror(errno));
exit(EX_FAIL);
}
mnt_err = try_mount(spec, mount_point, flags, fs_type,
&extra_opts, mount_opts, fake,
BACKGROUND);
if (verbose && mnt_err)
printf(_("%s: giving up \"%s\"\n"),
progname, spec);
}
out:
free(mount_opts);
free(extra_opts);
free(mount_point);
exit(mnt_err);
out_usage:
free(mount_opts);
exit(EX_USAGE);
}
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