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authorEdward Tomasz Napierala <trasz@FreeBSD.org>2014-08-17 09:44:42 +0000
committerEdward Tomasz Napierala <trasz@FreeBSD.org>2014-08-17 09:44:42 +0000
commit3914ddf8a7b16925f50cc2e29e916aa2d56063fb (patch)
treeb1803eddeeac8277c4ac48d69f5a735564939289 /usr.sbin/autofs/automount.c
parentf0f8856f68fdcd721cad383da425b69782b43cfe (diff)
downloadsrc-3914ddf8a7b16925f50cc2e29e916aa2d56063fb.tar.gz
src-3914ddf8a7b16925f50cc2e29e916aa2d56063fb.zip
Bring in the new automounter, similar to what's provided in most other
UNIX systems, eg. MacOS X and Solaris. It uses Sun-compatible map format, has proper kernel support, and LDAP integration. There are still a few outstanding problems; they will be fixed shortly. Reviewed by: allanjude@, emaste@, kib@, wblock@ (earlier versions) Phabric: D523 MFC after: 2 weeks Relnotes: yes Sponsored by: The FreeBSD Foundation
Notes
Notes: svn path=/head/; revision=270096
Diffstat (limited to 'usr.sbin/autofs/automount.c')
-rw-r--r--usr.sbin/autofs/automount.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/usr.sbin/autofs/automount.c b/usr.sbin/autofs/automount.c
new file mode 100644
index 000000000000..ef784a69ae61
--- /dev/null
+++ b/usr.sbin/autofs/automount.c
@@ -0,0 +1,345 @@
+/*-
+ * Copyright (c) 2014 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Edward Tomasz Napierala under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/mount.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/utsname.h>
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <netdb.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libutil.h>
+
+#include "common.h"
+#include "mntopts.h"
+
+static int
+unmount_by_statfs(const struct statfs *sb, bool force)
+{
+ char *fsid_str;
+ int error, ret, flags;
+
+ ret = asprintf(&fsid_str, "FSID:%d:%d",
+ sb->f_fsid.val[0], sb->f_fsid.val[1]);
+ if (ret < 0)
+ log_err(1, "asprintf");
+
+ log_debugx("unmounting %s using %s", sb->f_mntonname, fsid_str);
+
+ flags = MNT_BYFSID;
+ if (force)
+ flags |= MNT_FORCE;
+ error = unmount(fsid_str, flags);
+ free(fsid_str);
+ if (error != 0)
+ log_warn("cannot unmount %s", sb->f_mntonname);
+
+ return (error);
+}
+
+static const struct statfs *
+find_statfs(const struct statfs *mntbuf, int nitems, const char *mountpoint)
+{
+ int i;
+
+ for (i = 0; i < nitems; i++) {
+ if (strcmp(mntbuf[i].f_mntonname, mountpoint) == 0)
+ return (mntbuf + i);
+ }
+
+ return (NULL);
+}
+
+static void
+mount_autofs(const char *from, const char *fspath, const char *options,
+ const char *prefix)
+{
+ struct iovec *iov = NULL;
+ char errmsg[255];
+ int error, iovlen = 0;
+
+ create_directory(fspath);
+
+ log_debugx("mounting %s on %s, prefix \"%s\", options \"%s\"",
+ from, fspath, prefix, options);
+ memset(errmsg, 0, sizeof(errmsg));
+
+ build_iovec(&iov, &iovlen, "fstype",
+ __DECONST(void *, "autofs"), (size_t)-1);
+ build_iovec(&iov, &iovlen, "fspath",
+ __DECONST(void *, fspath), (size_t)-1);
+ build_iovec(&iov, &iovlen, "from",
+ __DECONST(void *, from), (size_t)-1);
+ build_iovec(&iov, &iovlen, "errmsg",
+ errmsg, sizeof(errmsg));
+
+ /*
+ * Append the options and mountpoint defined in auto_master(5);
+ * this way automountd(8) does not need to parse it.
+ */
+ build_iovec(&iov, &iovlen, "master_options",
+ __DECONST(void *, options), (size_t)-1);
+ build_iovec(&iov, &iovlen, "master_prefix",
+ __DECONST(void *, prefix), (size_t)-1);
+
+ error = nmount(iov, iovlen, 0);
+ if (error != 0) {
+ if (*errmsg != '\0') {
+ log_err(1, "cannot mount %s on %s: %s",
+ from, fspath, errmsg);
+ } else {
+ log_err(1, "cannot mount %s on %s", from, fspath);
+ }
+ }
+}
+
+static void
+mount_if_not_already(const struct node *n, const char *map,
+ const struct statfs *mntbuf, int nitems)
+{
+ const struct statfs *sb;
+ char *mountpoint;
+ char *from;
+ int ret;
+
+ ret = asprintf(&from, "map %s", map);
+ if (ret < 0)
+ log_err(1, "asprintf");
+
+ mountpoint = node_path(n);
+ sb = find_statfs(mntbuf, nitems, mountpoint);
+ if (sb != NULL) {
+ if (strcmp(sb->f_fstypename, "autofs") != 0) {
+ log_debugx("unknown filesystem mounted "
+ "on %s; mounting", mountpoint);
+ /*
+ * XXX: Compare options and 'from',
+ * and update the mount if necessary.
+ */
+ } else {
+ log_debugx("autofs already mounted "
+ "on %s", mountpoint);
+ free(from);
+ free(mountpoint);
+ return;
+ }
+ } else {
+ log_debugx("nothing mounted on %s; mounting",
+ mountpoint);
+ }
+
+ mount_autofs(from, mountpoint, n->n_options, n->n_key);
+ free(from);
+ free(mountpoint);
+}
+
+static void
+mount_unmount(struct node *root)
+{
+ struct statfs *mntbuf;
+ struct node *n, *n2, *n3;
+ int i, nitems;
+
+ nitems = getmntinfo(&mntbuf, MNT_WAIT);
+ if (nitems <= 0)
+ log_err(1, "getmntinfo");
+
+ log_debugx("unmounting stale autofs mounts");
+
+ for (i = 0; i < nitems; i++) {
+ if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) {
+ log_debugx("skipping %s, filesystem type is not autofs",
+ mntbuf[i].f_mntonname);
+ continue;
+ }
+
+ n = node_find(root, mntbuf[i].f_mntonname);
+ if (n != NULL) {
+ log_debugx("leaving autofs mounted on %s",
+ mntbuf[i].f_mntonname);
+ continue;
+ }
+
+ log_debugx("autofs mounted on %s not found "
+ "in new configuration; unmounting", mntbuf[i].f_mntonname);
+ unmount_by_statfs(&(mntbuf[i]), false);
+ }
+
+ log_debugx("mounting new autofs mounts");
+
+ TAILQ_FOREACH(n, &root->n_children, n_next) {
+ if (!node_is_direct_map(n)) {
+ mount_if_not_already(n, n->n_map, mntbuf, nitems);
+ continue;
+ }
+
+ TAILQ_FOREACH(n2, &n->n_children, n_next) {
+ TAILQ_FOREACH(n3, &n2->n_children, n_next) {
+ mount_if_not_already(n3, n->n_map,
+ mntbuf, nitems);
+ }
+ }
+ }
+}
+
+static void
+unmount_automounted(bool force)
+{
+ struct statfs *mntbuf;
+ int i, nitems;
+
+ nitems = getmntinfo(&mntbuf, MNT_WAIT);
+ if (nitems <= 0)
+ log_err(1, "getmntinfo");
+
+ log_debugx("unmounting automounted filesystems");
+
+ for (i = 0; i < nitems; i++) {
+ if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
+ log_debugx("skipping %s, filesystem type is autofs",
+ mntbuf[i].f_mntonname);
+ continue;
+ }
+
+ if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
+ log_debugx("skipping %s, not automounted",
+ mntbuf[i].f_mntonname);
+ continue;
+ }
+
+ unmount_by_statfs(&(mntbuf[i]), force);
+ }
+}
+
+static void
+usage_automount(void)
+{
+
+ fprintf(stderr, "usage: automount [-D name=value][-o opts][-Lfuv]\n");
+ exit(1);
+}
+
+int
+main_automount(int argc, char **argv)
+{
+ struct node *root;
+ int ch, debug = 0, show_maps = 0;
+ char *options = NULL;
+ bool do_unmount = false, force_unmount = false;
+
+ /*
+ * Note that in automount(8), the only purpose of variable
+ * handling is to aid in debugging maps (automount -L).
+ */
+ defined_init();
+
+ while ((ch = getopt(argc, argv, "D:Lfo:uv")) != -1) {
+ switch (ch) {
+ case 'D':
+ defined_parse_and_add(optarg);
+ break;
+ case 'L':
+ show_maps++;
+ break;
+ case 'f':
+ force_unmount = true;
+ break;
+ case 'o':
+ if (options == NULL) {
+ options = checked_strdup(optarg);
+ } else {
+ options =
+ separated_concat(options, optarg, ',');
+ }
+ break;
+ case 'u':
+ do_unmount = true;
+ break;
+ case 'v':
+ debug++;
+ break;
+ case '?':
+ default:
+ usage_automount();
+ }
+ }
+ argc -= optind;
+ if (argc != 0)
+ usage_automount();
+
+ if (force_unmount && !do_unmount)
+ usage_automount();
+
+ log_init(debug);
+
+ if (do_unmount) {
+ unmount_automounted(force_unmount);
+ return (0);
+ }
+
+ root = node_new_root();
+ parse_master(root, AUTO_MASTER_PATH);
+
+ if (show_maps) {
+ if (options != NULL) {
+ root->n_options = separated_concat(options,
+ root->n_options, ',');
+ }
+ if (show_maps > 1) {
+ node_expand_indirect_maps(root);
+ node_expand_ampersand(root, NULL);
+ }
+ node_expand_defined(root);
+ node_print(root);
+ return (0);
+ }
+
+ mount_unmount(root);
+
+ return (0);
+}