diff options
Diffstat (limited to 'sys/contrib/openzfs/lib/libshare/os/freebsd/nfs.c')
| -rw-r--r-- | sys/contrib/openzfs/lib/libshare/os/freebsd/nfs.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/lib/libshare/os/freebsd/nfs.c b/sys/contrib/openzfs/lib/libshare/os/freebsd/nfs.c new file mode 100644 index 000000000000..969194f2881a --- /dev/null +++ b/sys/contrib/openzfs/lib/libshare/os/freebsd/nfs.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: BSD-2-Clause +/* + * 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, 2022 by Delphix. All rights reserved. + */ + +#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 ZFS_EXPORTS_FILE "/etc/zfs/exports" +#define ZFS_EXPORTS_LOCK ZFS_EXPORTS_FILE".lock" + +/* + * This function translates 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 + */ +static int +translate_opts(char *oldopts, FILE *out) +{ + static const char *const known_opts[] = { "ro", "maproot", "mapall", + "mask", "network", "sec", "alldirs", "public", "webnfs", "index", + "quiet" }; + char *newopts, *o, *s = NULL; + unsigned int i; + size_t len, newopts_len; + int ret; + + /* + * Calculate the length needed for the worst case of a single + * character option: + * - Add one to strlen(oldopts) so that the trailing nul is counted + * as a separator. + * - Multiply by 3/2 since the single character option plus separator + * is expanded to 3 characters. + * - Add one for the trailing nul. Needed for a single repetition of + * the single character option and certain other cases. + */ + newopts_len = (strlen(oldopts) + 1) * 3 / 2 + 1; + newopts = malloc(newopts_len); + if (newopts == NULL) + return (EOF); + newopts[0] = '\0'; + s = oldopts; + while ((o = strsep(&s, ", ")) != NULL) { + if (o[0] == '-') + o++; + if (o[0] == '\0') + continue; + for (i = 0; i < ARRAY_SIZE(known_opts); ++i) { + len = strlen(known_opts[i]); + if (strncmp(known_opts[i], o, len) == 0 && + (o[len] == '\0' || o[len] == '=')) { + strlcat(newopts, "-", newopts_len); + break; + } + } + strlcat(newopts, o, newopts_len); + strlcat(newopts, " ", newopts_len); + } + ret = fputs(newopts, out); + free(newopts); + return (ret); +} + +static int +nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile) +{ + const char *shareopts = impl_share->sa_shareopts; + if (strcmp(shareopts, "on") == 0) + shareopts = ""; + + boolean_t need_free, fnd_semi; + char *mp, *lineopts, *exportopts, *s; + size_t whitelen; + int rc = nfs_escape_mountpoint(impl_share->sa_mountpoint, &mp, + &need_free); + if (rc != SA_OK) + return (rc); + + lineopts = strdup(shareopts); + if (lineopts == NULL) + return (SA_SYSTEM_ERR); + s = lineopts; + fnd_semi = B_FALSE; + while ((exportopts = strsep(&s, ";")) != NULL) { + if (s != NULL) + fnd_semi = B_TRUE; + /* Ignore only whitespace between ';' separated option sets. */ + if (fnd_semi) { + whitelen = strspn(exportopts, "\t "); + if (exportopts[whitelen] == '\0') + continue; + } + if (fputs(mp, tmpfile) == EOF || + fputc('\t', tmpfile) == EOF || + translate_opts(exportopts, tmpfile) == EOF || + fputc('\n', tmpfile) == EOF) { + fprintf(stderr, "failed to write to temporary file\n"); + rc = SA_SYSTEM_ERR; + break; + } + } + free(lineopts); + + if (need_free) + free(mp); + return (rc); +} + +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) +{ + if (strlen(shareopts) == 0) + return (SA_SYNTAX_ERR); + return (SA_OK); +} + +/* + * 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 void +nfs_truncate_shares(void) +{ + nfs_reset_shares(ZFS_EXPORTS_LOCK, ZFS_EXPORTS_FILE); +} + +const sa_fstype_t libshare_nfs_type = { + .enable_share = nfs_enable_share, + .disable_share = nfs_disable_share, + .is_shared = nfs_is_shared, + + .validate_shareopts = nfs_validate_shareopts, + .commit_shares = nfs_commit_shares, + .truncate_shares = nfs_truncate_shares, +}; |