/* * Copyright (c) 2007 Pawel Jakub Dawidek * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #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); }