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-rw-r--r--utils/mount/mount.c558
1 files changed, 558 insertions, 0 deletions
diff --git a/utils/mount/mount.c b/utils/mount/mount.c
new file mode 100644
index 0000000..b98f9e0
--- /dev/null
+++ b/utils/mount/mount.c
@@ -0,0 +1,558 @@
+/*
+ * 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 <libgen.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;
+ }
+
+ 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));
+
+ 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;
+ }
+ }
+
+ if ((argc < 3)) {
+ mount_usage();
+ exit(EX_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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-27 16:44:22 +0000