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-rw-r--r--sys-utils/mount.c996
1 files changed, 996 insertions, 0 deletions
diff --git a/sys-utils/mount.c b/sys-utils/mount.c
new file mode 100644
index 0000000..a87833e
--- /dev/null
+++ b/sys-utils/mount.c
@@ -0,0 +1,996 @@
+/*
+ * mount(8) -- mount a filesystem
+ *
+ * Copyright (C) 2011 Red Hat, Inc. All rights reserved.
+ * Written by Karel Zak <kzak@redhat.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 would 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <stdarg.h>
+#include <libmount.h>
+#include <ctype.h>
+
+#include "nls.h"
+#include "c.h"
+#include "env.h"
+#include "strutils.h"
+#include "closestream.h"
+#include "canonicalize.h"
+
+#define XALLOC_EXIT_CODE MNT_EX_SYSERR
+#include "xalloc.h"
+
+#define OPTUTILS_EXIT_CODE MNT_EX_USAGE
+#include "optutils.h"
+
+static int mk_exit_code(struct libmnt_context *cxt, int rc);
+
+static void suid_drop(struct libmnt_context *cxt)
+{
+ const uid_t ruid = getuid();
+ const uid_t euid = geteuid();
+
+ if (ruid != 0 && euid == 0) {
+ if (setgid(getgid()) < 0)
+ err(MNT_EX_FAIL, _("setgid() failed"));
+
+ if (setuid(getuid()) < 0)
+ err(MNT_EX_FAIL, _("setuid() failed"));
+ }
+
+ /* be paranoid and check it, setuid(0) has to fail */
+ if (ruid != 0 && setuid(0) == 0)
+ errx(MNT_EX_FAIL, _("drop permissions failed."));
+
+ mnt_context_force_unrestricted(cxt);
+}
+
+static void __attribute__((__noreturn__)) mount_print_version(void)
+{
+ const char *ver = NULL;
+ const char **features = NULL, **p;
+
+ mnt_get_library_version(&ver);
+ mnt_get_library_features(&features);
+
+ printf(_("%s from %s (libmount %s"),
+ program_invocation_short_name,
+ PACKAGE_STRING,
+ ver);
+ p = features;
+ while (p && *p) {
+ fputs(p == features ? ": " : ", ", stdout);
+ fputs(*p++, stdout);
+ }
+ fputs(")\n", stdout);
+ exit(MNT_EX_SUCCESS);
+}
+
+static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)),
+ const char *filename, int line)
+{
+ if (filename)
+ warnx(_("%s: parse error at line %d -- ignored"), filename, line);
+ return 1;
+}
+
+/*
+ * Replace control chars with '?' to be compatible with coreutils. For more
+ * robust solution use findmnt(1) where we use \x?? hex encoding.
+ */
+static void safe_fputs(const char *data)
+{
+ const char *p;
+
+ for (p = data; p && *p; p++) {
+ if (iscntrl((unsigned char) *p))
+ fputc('?', stdout);
+ else
+ fputc(*p, stdout);
+ }
+}
+
+static void print_all(struct libmnt_context *cxt, char *pattern, int show_label)
+{
+ struct libmnt_table *tb;
+ struct libmnt_iter *itr = NULL;
+ struct libmnt_fs *fs;
+ struct libmnt_cache *cache = NULL;
+
+ if (mnt_context_get_mtab(cxt, &tb))
+ err(MNT_EX_SYSERR, _("failed to read mtab"));
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr)
+ err(MNT_EX_SYSERR, _("failed to initialize libmount iterator"));
+ if (show_label)
+ cache = mnt_new_cache();
+
+ while (mnt_table_next_fs(tb, itr, &fs) == 0) {
+ const char *type = mnt_fs_get_fstype(fs);
+ const char *src = mnt_fs_get_source(fs);
+ const char *optstr = mnt_fs_get_options(fs);
+ char *xsrc = NULL;
+
+ if (type && pattern && !mnt_match_fstype(type, pattern))
+ continue;
+
+ if (!mnt_fs_is_pseudofs(fs) && !mnt_fs_is_netfs(fs))
+ xsrc = mnt_pretty_path(src, cache);
+ printf ("%s on ", xsrc ? xsrc : src);
+ safe_fputs(mnt_fs_get_target(fs));
+
+ if (type)
+ printf (" type %s", type);
+ if (optstr)
+ printf (" (%s)", optstr);
+ if (show_label && src) {
+ char *lb = mnt_cache_find_tag_value(cache, src, "LABEL");
+ if (lb)
+ printf (" [%s]", lb);
+ }
+ fputc('\n', stdout);
+ free(xsrc);
+ }
+
+ mnt_unref_cache(cache);
+ mnt_free_iter(itr);
+}
+
+/*
+ * mount -a [-F]
+ */
+static int mount_all(struct libmnt_context *cxt)
+{
+ struct libmnt_iter *itr;
+ struct libmnt_fs *fs;
+ int mntrc, ignored, rc = MNT_EX_SUCCESS;
+
+ int nsucc = 0, nerrs = 0;
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr) {
+ warn(_("failed to initialize libmount iterator"));
+ return MNT_EX_SYSERR;
+ }
+
+ while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) {
+
+ const char *tgt = mnt_fs_get_target(fs);
+
+ if (ignored) {
+ if (mnt_context_is_verbose(cxt))
+ printf(ignored == 1 ? _("%-25s: ignored\n") :
+ _("%-25s: already mounted\n"),
+ tgt);
+ } else if (mnt_context_is_fork(cxt)) {
+ if (mnt_context_is_verbose(cxt))
+ printf("%-25s: mount successfully forked\n", tgt);
+ } else {
+ if (mk_exit_code(cxt, mntrc) == MNT_EX_SUCCESS) {
+ nsucc++;
+
+ /* Note that MNT_EX_SUCCESS return code does
+ * not mean that FS has been really mounted
+ * (e.g. nofail option) */
+ if (mnt_context_get_status(cxt)
+ && mnt_context_is_verbose(cxt))
+ printf("%-25s: successfully mounted\n", tgt);
+ } else
+ nerrs++;
+ }
+ }
+
+ if (mnt_context_is_parent(cxt)) {
+ /* wait for mount --fork children */
+ int nchildren = 0;
+
+ nerrs = 0, nsucc = 0;
+
+ rc = mnt_context_wait_for_children(cxt, &nchildren, &nerrs);
+ if (!rc && nchildren)
+ nsucc = nchildren - nerrs;
+ }
+
+ if (nerrs == 0)
+ rc = MNT_EX_SUCCESS; /* all success */
+ else if (nsucc == 0)
+ rc = MNT_EX_FAIL; /* all failed */
+ else
+ rc = MNT_EX_SOMEOK; /* some success, some failed */
+
+ mnt_free_iter(itr);
+ return rc;
+}
+
+
+/*
+ * mount -a -o remount
+ */
+static int remount_all(struct libmnt_context *cxt)
+{
+ struct libmnt_iter *itr;
+ struct libmnt_fs *fs;
+ int mntrc, ignored, rc = MNT_EX_SUCCESS;
+
+ int nsucc = 0, nerrs = 0;
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr) {
+ warn(_("failed to initialize libmount iterator"));
+ return MNT_EX_SYSERR;
+ }
+
+ while (mnt_context_next_remount(cxt, itr, &fs, &mntrc, &ignored) == 0) {
+
+ const char *tgt = mnt_fs_get_target(fs);
+
+ if (ignored) {
+ if (mnt_context_is_verbose(cxt))
+ printf(_("%-25s: ignored\n"), tgt);
+ } else {
+ if (mk_exit_code(cxt, mntrc) == MNT_EX_SUCCESS) {
+ nsucc++;
+
+ /* Note that MNT_EX_SUCCESS return code does
+ * not mean that FS has been really mounted
+ * (e.g. nofail option) */
+ if (mnt_context_get_status(cxt)
+ && mnt_context_is_verbose(cxt))
+ printf("%-25s: successfully remounted\n", tgt);
+ } else
+ nerrs++;
+ }
+ }
+
+ if (nerrs == 0)
+ rc = MNT_EX_SUCCESS; /* all success */
+ else if (nsucc == 0)
+ rc = MNT_EX_FAIL; /* all failed */
+ else
+ rc = MNT_EX_SOMEOK; /* some success, some failed */
+
+ mnt_free_iter(itr);
+ return rc;
+}
+
+static void success_message(struct libmnt_context *cxt)
+{
+ unsigned long mflags = 0;
+ const char *tgt, *src, *pr = program_invocation_short_name;
+
+ if (mnt_context_helper_executed(cxt)
+ || mnt_context_get_status(cxt) != 1)
+ return;
+
+ mnt_context_get_mflags(cxt, &mflags);
+ tgt = mnt_context_get_target(cxt);
+ src = mnt_context_get_source(cxt);
+
+ if (mflags & MS_MOVE)
+ printf(_("%s: %s moved to %s.\n"), pr, src, tgt);
+ else if (mflags & MS_BIND)
+ printf(_("%s: %s bound on %s.\n"), pr, src, tgt);
+ else if (mflags & MS_PROPAGATION) {
+ if (src && strcmp(src, "none") != 0 && tgt)
+ printf(_("%s: %s mounted on %s.\n"), pr, src, tgt);
+
+ printf(_("%s: %s propagation flags changed.\n"), pr, tgt);
+ } else
+ printf(_("%s: %s mounted on %s.\n"), pr, src, tgt);
+}
+
+#if defined(HAVE_LIBSELINUX) && defined(HAVE_SECURITY_GET_INITIAL_CONTEXT)
+#include <selinux/selinux.h>
+#include <selinux/context.h>
+
+static void selinux_warning(struct libmnt_context *cxt, const char *tgt)
+{
+
+ if (tgt && mnt_context_is_verbose(cxt) && is_selinux_enabled() > 0) {
+ security_context_t raw = NULL, def = NULL;
+
+ if (getfilecon(tgt, &raw) > 0
+ && security_get_initial_context("file", &def) == 0) {
+
+ if (!selinux_file_context_cmp(raw, def))
+ printf(_(
+ "mount: %s does not contain SELinux labels.\n"
+ " You just mounted an file system that supports labels which does not\n"
+ " contain labels, onto an SELinux box. It is likely that confined\n"
+ " applications will generate AVC messages and not be allowed access to\n"
+ " this file system. For more details see restorecon(8) and mount(8).\n"),
+ tgt);
+ }
+ freecon(raw);
+ freecon(def);
+ }
+}
+#else
+# define selinux_warning(_x, _y)
+#endif
+
+/*
+ * Returns exit status (MNT_EX_*) and/or prints error message.
+ */
+static int mk_exit_code(struct libmnt_context *cxt, int rc)
+{
+ const char *tgt;
+ char buf[BUFSIZ] = { 0 };
+
+ rc = mnt_context_get_excode(cxt, rc, buf, sizeof(buf));
+ tgt = mnt_context_get_target(cxt);
+
+ if (*buf) {
+ const char *spec = tgt;
+ if (!spec)
+ spec = mnt_context_get_source(cxt);
+ if (!spec)
+ spec = "???";
+ warnx("%s: %s.", spec, buf);
+ }
+
+ if (rc == MNT_EX_SUCCESS && mnt_context_get_status(cxt) == 1) {
+ selinux_warning(cxt, tgt);
+ }
+ return rc;
+}
+
+static struct libmnt_table *append_fstab(struct libmnt_context *cxt,
+ struct libmnt_table *fstab,
+ const char *path)
+{
+
+ if (!fstab) {
+ fstab = mnt_new_table();
+ if (!fstab)
+ err(MNT_EX_SYSERR, _("failed to initialize libmount table"));
+
+ mnt_table_set_parser_errcb(fstab, table_parser_errcb);
+ mnt_context_set_fstab(cxt, fstab);
+
+ mnt_unref_table(fstab); /* reference is handled by @cxt now */
+ }
+
+ if (mnt_table_parse_fstab(fstab, path))
+ errx(MNT_EX_USAGE,_("%s: failed to parse"), path);
+
+ return fstab;
+}
+
+/*
+ * Check source and target paths -- non-root user should not be able to
+ * resolve paths which are unreadable for him.
+ */
+static int sanitize_paths(struct libmnt_context *cxt)
+{
+ const char *p;
+ struct libmnt_fs *fs = mnt_context_get_fs(cxt);
+
+ if (!fs)
+ return 0;
+
+ p = mnt_fs_get_target(fs);
+ if (p) {
+ char *np = canonicalize_path_restricted(p);
+ if (!np)
+ return -EPERM;
+ mnt_fs_set_target(fs, np);
+ free(np);
+ }
+
+ p = mnt_fs_get_srcpath(fs);
+ if (p) {
+ char *np = canonicalize_path_restricted(p);
+ if (!np)
+ return -EPERM;
+ mnt_fs_set_source(fs, np);
+ free(np);
+ }
+ return 0;
+}
+
+static void append_option(struct libmnt_context *cxt, const char *opt)
+{
+ if (opt && (*opt == '=' || *opt == '\'' || *opt == '\"' || isblank(*opt)))
+ errx(MNT_EX_USAGE, _("unsupported option format: %s"), opt);
+ if (mnt_context_append_options(cxt, opt))
+ err(MNT_EX_SYSERR, _("failed to append option '%s'"), opt);
+}
+
+static int has_remount_flag(struct libmnt_context *cxt)
+{
+ unsigned long mflags = 0;
+
+ if (mnt_context_get_mflags(cxt, &mflags))
+ return 0;
+
+ return mflags & MS_REMOUNT;
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(
+ " %1$s [-lhV]\n"
+ " %1$s -a [options]\n"
+ " %1$s [options] [--source] <source> | [--target] <directory>\n"
+ " %1$s [options] <source> <directory>\n"
+ " %1$s <operation> <mountpoint> [<target>]\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Mount a filesystem.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fprintf(out, _(
+ " -a, --all mount all filesystems mentioned in fstab\n"
+ " -c, --no-canonicalize don't canonicalize paths\n"
+ " -f, --fake dry run; skip the mount(2) syscall\n"
+ " -F, --fork fork off for each device (use with -a)\n"
+ " -T, --fstab <path> alternative file to /etc/fstab\n"));
+ fprintf(out, _(
+ " -i, --internal-only don't call the mount.<type> helpers\n"));
+ fprintf(out, _(
+ " -l, --show-labels show also filesystem labels\n"));
+ fprintf(out, _(
+ " -n, --no-mtab don't write to /etc/mtab\n"));
+ fprintf(out, _(
+ " --options-mode <mode>\n"
+ " what to do with options loaded from fstab\n"
+ " --options-source <source>\n"
+ " mount options source\n"
+ " --options-source-force\n"
+ " force use of options from fstab/mtab\n"));
+ fprintf(out, _(
+ " -o, --options <list> comma-separated list of mount options\n"
+ " -O, --test-opts <list> limit the set of filesystems (use with -a)\n"
+ " -r, --read-only mount the filesystem read-only (same as -o ro)\n"
+ " -t, --types <list> limit the set of filesystem types\n"));
+ fprintf(out, _(
+ " --source <src> explicitly specifies source (path, label, uuid)\n"
+ " --target <target> explicitly specifies mountpoint\n"));
+ fprintf(out, _(
+ " --target-prefix <path>\n"
+ " specifies path use for all mountpoints\n"));
+ fprintf(out, _(
+ " -v, --verbose say what is being done\n"));
+ fprintf(out, _(
+ " -w, --rw, --read-write mount the filesystem read-write (default)\n"));
+ fprintf(out, _(
+ " -N, --namespace <ns> perform mount in another namespace\n"));
+
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(25));
+
+ fprintf(out, _(
+ "\nSource:\n"
+ " -L, --label <label> synonym for LABEL=<label>\n"
+ " -U, --uuid <uuid> synonym for UUID=<uuid>\n"
+ " LABEL=<label> specifies device by filesystem label\n"
+ " UUID=<uuid> specifies device by filesystem UUID\n"
+ " PARTLABEL=<label> specifies device by partition label\n"
+ " PARTUUID=<uuid> specifies device by partition UUID\n"
+ " ID=<id> specifies device by udev hardware ID\n"));
+
+ fprintf(out, _(
+ " <device> specifies device by path\n"
+ " <directory> mountpoint for bind mounts (see --bind/rbind)\n"
+ " <file> regular file for loopdev setup\n"));
+
+ fprintf(out, _(
+ "\nOperations:\n"
+ " -B, --bind mount a subtree somewhere else (same as -o bind)\n"
+ " -M, --move move a subtree to some other place\n"
+ " -R, --rbind mount a subtree and all submounts somewhere else\n"));
+ fprintf(out, _(
+ " --make-shared mark a subtree as shared\n"
+ " --make-slave mark a subtree as slave\n"
+ " --make-private mark a subtree as private\n"
+ " --make-unbindable mark a subtree as unbindable\n"));
+ fprintf(out, _(
+ " --make-rshared recursively mark a whole subtree as shared\n"
+ " --make-rslave recursively mark a whole subtree as slave\n"
+ " --make-rprivate recursively mark a whole subtree as private\n"
+ " --make-runbindable recursively mark a whole subtree as unbindable\n"));
+
+ printf(USAGE_MAN_TAIL("mount(8)"));
+
+ exit(MNT_EX_SUCCESS);
+}
+
+struct flag_str {
+ int value;
+ char *str;
+};
+
+static int omode2mask(const char *str)
+{
+ size_t i;
+
+ static const struct flag_str flags[] = {
+ { MNT_OMODE_IGNORE, "ignore" },
+ { MNT_OMODE_APPEND, "append" },
+ { MNT_OMODE_PREPEND, "prepend" },
+ { MNT_OMODE_REPLACE, "replace" },
+ };
+
+ for (i = 0; i < ARRAY_SIZE(flags); i++) {
+ if (!strcmp(str, flags[i].str))
+ return flags[i].value;
+ }
+ return -EINVAL;
+}
+
+static long osrc2mask(const char *str, size_t len)
+{
+ size_t i;
+
+ static const struct flag_str flags[] = {
+ { MNT_OMODE_FSTAB, "fstab" },
+ { MNT_OMODE_MTAB, "mtab" },
+ { MNT_OMODE_NOTAB, "disable" },
+ };
+
+ for (i = 0; i < ARRAY_SIZE(flags); i++) {
+ if (!strncmp(str, flags[i].str, len) && !flags[i].str[len])
+ return flags[i].value;
+ }
+ return -EINVAL;
+}
+
+static pid_t parse_pid(const char *str)
+{
+ char *end;
+ pid_t ret;
+
+ errno = 0;
+ ret = strtoul(str, &end, 10);
+
+ if (ret < 0 || errno || end == str || (end && *end))
+ return 0;
+ return ret;
+}
+
+int main(int argc, char **argv)
+{
+ int c, rc = MNT_EX_SUCCESS, all = 0, show_labels = 0;
+ struct libmnt_context *cxt;
+ struct libmnt_table *fstab = NULL;
+ char *srcbuf = NULL;
+ char *types = NULL;
+ int oper = 0, is_move = 0;
+ int propa = 0;
+ int optmode = 0, optmode_mode = 0, optmode_src = 0;
+
+ enum {
+ MOUNT_OPT_SHARED = CHAR_MAX + 1,
+ MOUNT_OPT_SLAVE,
+ MOUNT_OPT_PRIVATE,
+ MOUNT_OPT_UNBINDABLE,
+ MOUNT_OPT_RSHARED,
+ MOUNT_OPT_RSLAVE,
+ MOUNT_OPT_RPRIVATE,
+ MOUNT_OPT_RUNBINDABLE,
+ MOUNT_OPT_TARGET,
+ MOUNT_OPT_TARGET_PREFIX,
+ MOUNT_OPT_SOURCE,
+ MOUNT_OPT_OPTMODE,
+ MOUNT_OPT_OPTSRC,
+ MOUNT_OPT_OPTSRC_FORCE
+ };
+
+ static const struct option longopts[] = {
+ { "all", no_argument, NULL, 'a' },
+ { "fake", no_argument, NULL, 'f' },
+ { "fstab", required_argument, NULL, 'T' },
+ { "fork", no_argument, NULL, 'F' },
+ { "help", no_argument, NULL, 'h' },
+ { "no-mtab", no_argument, NULL, 'n' },
+ { "read-only", no_argument, NULL, 'r' },
+ { "ro", no_argument, NULL, 'r' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "version", no_argument, NULL, 'V' },
+ { "read-write", no_argument, NULL, 'w' },
+ { "rw", no_argument, NULL, 'w' },
+ { "options", required_argument, NULL, 'o' },
+ { "test-opts", required_argument, NULL, 'O' },
+ { "types", required_argument, NULL, 't' },
+ { "uuid", required_argument, NULL, 'U' },
+ { "label", required_argument, NULL, 'L' },
+ { "bind", no_argument, NULL, 'B' },
+ { "move", no_argument, NULL, 'M' },
+ { "rbind", no_argument, NULL, 'R' },
+ { "make-shared", no_argument, NULL, MOUNT_OPT_SHARED },
+ { "make-slave", no_argument, NULL, MOUNT_OPT_SLAVE },
+ { "make-private", no_argument, NULL, MOUNT_OPT_PRIVATE },
+ { "make-unbindable", no_argument, NULL, MOUNT_OPT_UNBINDABLE },
+ { "make-rshared", no_argument, NULL, MOUNT_OPT_RSHARED },
+ { "make-rslave", no_argument, NULL, MOUNT_OPT_RSLAVE },
+ { "make-rprivate", no_argument, NULL, MOUNT_OPT_RPRIVATE },
+ { "make-runbindable", no_argument, NULL, MOUNT_OPT_RUNBINDABLE },
+ { "no-canonicalize", no_argument, NULL, 'c' },
+ { "internal-only", no_argument, NULL, 'i' },
+ { "show-labels", no_argument, NULL, 'l' },
+ { "target", required_argument, NULL, MOUNT_OPT_TARGET },
+ { "target-prefix", required_argument, NULL, MOUNT_OPT_TARGET_PREFIX },
+ { "source", required_argument, NULL, MOUNT_OPT_SOURCE },
+ { "options-mode", required_argument, NULL, MOUNT_OPT_OPTMODE },
+ { "options-source", required_argument, NULL, MOUNT_OPT_OPTSRC },
+ { "options-source-force", no_argument, NULL, MOUNT_OPT_OPTSRC_FORCE},
+ { "namespace", required_argument, NULL, 'N' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
+ { 'B','M','R' }, /* bind,move,rbind */
+ { 'L','U', MOUNT_OPT_SOURCE }, /* label,uuid,source */
+ { 0 }
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ sanitize_env();
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ strutils_set_exitcode(MNT_EX_USAGE);
+
+ mnt_init_debug(0);
+ cxt = mnt_new_context();
+ if (!cxt)
+ err(MNT_EX_SYSERR, _("libmount context allocation failed"));
+
+ mnt_context_set_tables_errcb(cxt, table_parser_errcb);
+
+ while ((c = getopt_long(argc, argv, "aBcfFhilL:Mno:O:rRsU:vVwt:T:N:",
+ longopts, NULL)) != -1) {
+
+ /* only few options are allowed for non-root users */
+ if (mnt_context_is_restricted(cxt) &&
+ !strchr("hlLUVvrist", c) &&
+ c != MOUNT_OPT_TARGET &&
+ c != MOUNT_OPT_SOURCE)
+ suid_drop(cxt);
+
+ err_exclusive_options(c, longopts, excl, excl_st);
+
+ switch(c) {
+ case 'a':
+ all = 1;
+ break;
+ case 'c':
+ mnt_context_disable_canonicalize(cxt, TRUE);
+ break;
+ case 'f':
+ mnt_context_enable_fake(cxt, TRUE);
+ break;
+ case 'F':
+ mnt_context_enable_fork(cxt, TRUE);
+ break;
+ case 'i':
+ mnt_context_disable_helpers(cxt, TRUE);
+ break;
+ case 'n':
+ mnt_context_disable_mtab(cxt, TRUE);
+ break;
+ case 'r':
+ append_option(cxt, "ro");
+ mnt_context_enable_rwonly_mount(cxt, FALSE);
+ break;
+ case 'v':
+ mnt_context_enable_verbose(cxt, TRUE);
+ break;
+ case 'w':
+ append_option(cxt, "rw");
+ mnt_context_enable_rwonly_mount(cxt, TRUE);
+ break;
+ case 'o':
+ /* "move" is not supported as option string in libmount
+ * to avoid use in fstab */
+ if (mnt_optstr_get_option(optarg, "move", NULL, 0) == 0) {
+ char *o = xstrdup(optarg);
+
+ mnt_optstr_remove_option(&o, "move");
+ if (o && *o)
+ append_option(cxt, o);
+ oper = is_move = 1;
+ free(o);
+ } else
+ append_option(cxt, optarg);
+ break;
+ case 'O':
+ if (mnt_context_set_options_pattern(cxt, optarg))
+ err(MNT_EX_SYSERR, _("failed to set options pattern"));
+ break;
+ case 'L':
+ xasprintf(&srcbuf, "LABEL=\"%s\"", optarg);
+ mnt_context_disable_swapmatch(cxt, 1);
+ mnt_context_set_source(cxt, srcbuf);
+ free(srcbuf);
+ break;
+ case 'U':
+ xasprintf(&srcbuf, "UUID=\"%s\"", optarg);
+ mnt_context_disable_swapmatch(cxt, 1);
+ mnt_context_set_source(cxt, srcbuf);
+ free(srcbuf);
+ break;
+ case 'l':
+ show_labels = 1;
+ break;
+ case 't':
+ types = optarg;
+ break;
+ case 'T':
+ fstab = append_fstab(cxt, fstab, optarg);
+ break;
+ case 's':
+ mnt_context_enable_sloppy(cxt, TRUE);
+ break;
+ case 'B':
+ oper = 1;
+ append_option(cxt, "bind");
+ break;
+ case 'M':
+ oper = 1;
+ is_move = 1;
+ break;
+ case 'R':
+ oper = 1;
+ append_option(cxt, "rbind");
+ break;
+ case 'N':
+ {
+ char path[PATH_MAX];
+ pid_t pid = parse_pid(optarg);
+
+ if (pid)
+ snprintf(path, sizeof(path), "/proc/%i/ns/mnt", pid);
+
+ if (mnt_context_set_target_ns(cxt, pid ? path : optarg))
+ err(MNT_EX_SYSERR, _("failed to set target namespace to %s"), pid ? path : optarg);
+ break;
+ }
+ case MOUNT_OPT_SHARED:
+ append_option(cxt, "shared");
+ propa = 1;
+ break;
+ case MOUNT_OPT_SLAVE:
+ append_option(cxt, "slave");
+ propa = 1;
+ break;
+ case MOUNT_OPT_PRIVATE:
+ append_option(cxt, "private");
+ propa = 1;
+ break;
+ case MOUNT_OPT_UNBINDABLE:
+ append_option(cxt, "unbindable");
+ propa = 1;
+ break;
+ case MOUNT_OPT_RSHARED:
+ append_option(cxt, "rshared");
+ propa = 1;
+ break;
+ case MOUNT_OPT_RSLAVE:
+ append_option(cxt, "rslave");
+ propa = 1;
+ break;
+ case MOUNT_OPT_RPRIVATE:
+ append_option(cxt, "rprivate");
+ propa = 1;
+ break;
+ case MOUNT_OPT_RUNBINDABLE:
+ append_option(cxt, "runbindable");
+ propa = 1;
+ break;
+ case MOUNT_OPT_TARGET:
+ mnt_context_disable_swapmatch(cxt, 1);
+ mnt_context_set_target(cxt, optarg);
+ break;
+ case MOUNT_OPT_TARGET_PREFIX:
+ mnt_context_set_target_prefix(cxt, optarg);
+ break;
+ case MOUNT_OPT_SOURCE:
+ mnt_context_disable_swapmatch(cxt, 1);
+ mnt_context_set_source(cxt, optarg);
+ break;
+ case MOUNT_OPT_OPTMODE:
+ optmode_mode = omode2mask(optarg);
+ if (optmode_mode == -EINVAL) {
+ warnx(_("bad usage"));
+ errtryhelp(MNT_EX_USAGE);
+ }
+ break;
+ case MOUNT_OPT_OPTSRC:
+ {
+ unsigned long tmp = 0;
+ if (string_to_bitmask(optarg, &tmp, osrc2mask)) {
+ warnx(_("bad usage"));
+ errtryhelp(MNT_EX_USAGE);
+ }
+ optmode_src = tmp;
+ break;
+ }
+ case MOUNT_OPT_OPTSRC_FORCE:
+ optmode |= MNT_OMODE_FORCE;
+ break;
+
+ case 'h':
+ mnt_free_context(cxt);
+ usage();
+ case 'V':
+ mnt_free_context(cxt);
+ mount_print_version();
+ default:
+ errtryhelp(MNT_EX_USAGE);
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ optmode |= optmode_mode | optmode_src;
+ if (optmode) {
+ if (!optmode_mode)
+ optmode |= MNT_OMODE_PREPEND;
+ if (!optmode_src)
+ optmode |= MNT_OMODE_FSTAB | MNT_OMODE_MTAB;
+ mnt_context_set_optsmode(cxt, optmode);
+ }
+
+ if (fstab && !mnt_context_is_nocanonicalize(cxt)) {
+ /*
+ * We have external (context independent) fstab instance, let's
+ * make a connection between the fstab and the canonicalization
+ * cache.
+ */
+ mnt_table_set_cache(fstab, mnt_context_get_cache(cxt));
+ }
+
+ if (!mnt_context_get_source(cxt) &&
+ !mnt_context_get_target(cxt) &&
+ !argc &&
+ !all) {
+ if (oper || mnt_context_get_options(cxt)) {
+ warnx(_("bad usage"));
+ errtryhelp(MNT_EX_USAGE);
+ }
+ print_all(cxt, types, show_labels);
+ goto done;
+ }
+
+ /* Non-root users are allowed to use -t to print_all(),
+ but not to mount */
+ if (mnt_context_is_restricted(cxt) && types)
+ suid_drop(cxt);
+
+ if (oper && (types || all || mnt_context_get_source(cxt))) {
+ warnx(_("bad usage"));
+ errtryhelp(MNT_EX_USAGE);
+ }
+
+ if (types && (all || strchr(types, ',') ||
+ strncmp(types, "no", 2) == 0))
+ mnt_context_set_fstype_pattern(cxt, types);
+ else if (types)
+ mnt_context_set_fstype(cxt, types);
+
+ if (all) {
+ /*
+ * A) Mount all
+ */
+ if (has_remount_flag(cxt))
+ rc = remount_all(cxt);
+ else
+ rc = mount_all(cxt);
+ goto done;
+
+ } else if (argc == 0 && (mnt_context_get_source(cxt) ||
+ mnt_context_get_target(cxt))) {
+ /*
+ * B) mount -L|-U|--source|--target
+ *
+ * non-root may specify source *or* target, but not both
+ */
+ if (mnt_context_is_restricted(cxt) &&
+ mnt_context_get_source(cxt) &&
+ mnt_context_get_target(cxt))
+ suid_drop(cxt);
+
+ } else if (argc == 1 && (!mnt_context_get_source(cxt) ||
+ !mnt_context_get_target(cxt))) {
+ /*
+ * C) mount [-L|-U|--source] <target>
+ * mount [--target <dir>] <source>
+ * mount <source|target>
+ *
+ * non-root may specify source *or* target, but not both
+ *
+ * It does not matter for libmount if we set source or target
+ * here (the library is able to swap it), but it matters for
+ * sanitize_paths().
+ */
+ int istag = mnt_tag_is_valid(argv[0]);
+
+ if (istag && mnt_context_get_source(cxt))
+ /* -L, -U or --source together with LABEL= or UUID= */
+ errx(MNT_EX_USAGE, _("source specified more than once"));
+ else if (istag || mnt_context_get_target(cxt))
+ mnt_context_set_source(cxt, argv[0]);
+ else
+ mnt_context_set_target(cxt, argv[0]);
+
+ if (mnt_context_is_restricted(cxt) &&
+ mnt_context_get_source(cxt) &&
+ mnt_context_get_target(cxt))
+ suid_drop(cxt);
+
+ } else if (argc == 2 && !mnt_context_get_source(cxt)
+ && !mnt_context_get_target(cxt)) {
+ /*
+ * D) mount <source> <target>
+ */
+ if (mnt_context_is_restricted(cxt))
+ suid_drop(cxt);
+
+ mnt_context_set_source(cxt, argv[0]);
+ mnt_context_set_target(cxt, argv[1]);
+
+ } else {
+ warnx(_("bad usage"));
+ errtryhelp(MNT_EX_USAGE);
+ }
+
+ if (mnt_context_is_restricted(cxt) && sanitize_paths(cxt) != 0)
+ suid_drop(cxt);
+
+ if (is_move)
+ /* "move" as option string is not supported by libmount */
+ mnt_context_set_mflags(cxt, MS_MOVE);
+
+ if ((oper && !has_remount_flag(cxt)) || propa)
+ /* For --make-* or --bind is fstab/mtab unnecessary */
+ mnt_context_set_optsmode(cxt, MNT_OMODE_NOTAB);
+
+ rc = mnt_context_mount(cxt);
+
+ if (rc == -EPERM
+ && mnt_context_is_restricted(cxt)
+ && !mnt_context_syscall_called(cxt)) {
+ /* Try it again without permissions */
+ suid_drop(cxt);
+ rc = mnt_context_mount(cxt);
+ }
+ rc = mk_exit_code(cxt, rc);
+
+ if (rc == MNT_EX_SUCCESS && mnt_context_is_verbose(cxt))
+ success_message(cxt);
+done:
+ mnt_free_context(cxt);
+ return rc;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 17:56:36 +0000