zfs/lib/libshare/os/freebsd/nfs.c

223 lines
5.8 KiB
C

/*
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* 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 AUTHORS 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 AUTHORS 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.
*
* Copyright (c) 2020 by Delphix. All rights reserved.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/vfs.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#include <libshare.h>
#include "libshare_impl.h"
#include "nfs.h"
#define _PATH_MOUNTDPID "/var/run/mountd.pid"
#define OPTSSIZE 1024
#define MAXLINESIZE (PATH_MAX + OPTSSIZE)
#define ZFS_EXPORTS_FILE "/etc/zfs/exports"
#define ZFS_EXPORTS_LOCK ZFS_EXPORTS_FILE".lock"
static sa_fstype_t *nfs_fstype;
/*
* This function translate options to a format acceptable by exports(5), eg.
*
* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \
* zfs.freebsd.org 69.147.83.54
*
* Accepted input formats:
*
* ro,network=192.168.0.0,mask=255.255.255.0,maproot=0,zfs.freebsd.org
* ro network=192.168.0.0 mask=255.255.255.0 maproot=0 zfs.freebsd.org
* -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,zfs.freebsd.org
* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \
* zfs.freebsd.org
*
* Recognized keywords:
*
* ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs,
* index, quiet
*
* NOTE: This function returns a static buffer and thus is not thread-safe.
*/
static char *
translate_opts(const char *shareopts)
{
static const char *known_opts[] = { "ro", "maproot", "mapall", "mask",
"network", "sec", "alldirs", "public", "webnfs", "index", "quiet",
NULL };
static char newopts[OPTSSIZE];
char oldopts[OPTSSIZE];
char *o, *s = NULL;
unsigned int i;
size_t len;
strlcpy(oldopts, shareopts, sizeof (oldopts));
newopts[0] = '\0';
s = oldopts;
while ((o = strsep(&s, "-, ")) != NULL) {
if (o[0] == '\0')
continue;
for (i = 0; known_opts[i] != NULL; i++) {
len = strlen(known_opts[i]);
if (strncmp(known_opts[i], o, len) == 0 &&
(o[len] == '\0' || o[len] == '=')) {
strlcat(newopts, "-", sizeof (newopts));
break;
}
}
strlcat(newopts, o, sizeof (newopts));
strlcat(newopts, " ", sizeof (newopts));
}
return (newopts);
}
static int
nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile)
{
char *shareopts = FSINFO(impl_share, nfs_fstype)->shareopts;
if (strcmp(shareopts, "on") == 0)
shareopts = "";
if (fprintf(tmpfile, "%s\t%s\n", impl_share->sa_mountpoint,
translate_opts(shareopts)) < 0) {
fprintf(stderr, "failed to write to temporary file\n");
return (SA_SYSTEM_ERR);
}
return (SA_OK);
}
static int
nfs_enable_share(sa_share_impl_t impl_share)
{
return (nfs_toggle_share(
ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share,
nfs_enable_share_impl));
}
static int
nfs_disable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile)
{
(void) impl_share, (void) tmpfile;
return (SA_OK);
}
static int
nfs_disable_share(sa_share_impl_t impl_share)
{
return (nfs_toggle_share(
ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE, NULL, impl_share,
nfs_disable_share_impl));
}
static boolean_t
nfs_is_shared(sa_share_impl_t impl_share)
{
return (nfs_is_shared_impl(ZFS_EXPORTS_FILE, impl_share));
}
static int
nfs_validate_shareopts(const char *shareopts)
{
return (SA_OK);
}
static int
nfs_update_shareopts(sa_share_impl_t impl_share, const char *shareopts)
{
FSINFO(impl_share, nfs_fstype)->shareopts = (char *)shareopts;
return (SA_OK);
}
static void
nfs_clear_shareopts(sa_share_impl_t impl_share)
{
FSINFO(impl_share, nfs_fstype)->shareopts = NULL;
}
/*
* Commit the shares by restarting mountd.
*/
static int
nfs_commit_shares(void)
{
struct pidfh *pfh;
pid_t mountdpid;
start:
pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
if (pfh != NULL) {
/* mountd(8) is not running. */
pidfile_remove(pfh);
return (SA_OK);
}
if (errno != EEXIST) {
/* Cannot open pidfile for some reason. */
return (SA_SYSTEM_ERR);
}
if (mountdpid == -1) {
/* mountd(8) exists, but didn't write the PID yet */
usleep(500);
goto start;
}
/* We have mountd(8) PID in mountdpid variable. */
kill(mountdpid, SIGHUP);
return (SA_OK);
}
static const sa_share_ops_t nfs_shareops = {
.enable_share = nfs_enable_share,
.disable_share = nfs_disable_share,
.is_shared = nfs_is_shared,
.validate_shareopts = nfs_validate_shareopts,
.update_shareopts = nfs_update_shareopts,
.clear_shareopts = nfs_clear_shareopts,
.commit_shares = nfs_commit_shares,
};
/*
* Initializes the NFS functionality of libshare.
*/
void
libshare_nfs_init(void)
{
nfs_fstype = register_fstype("nfs", &nfs_shareops);
}