/* * 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, 2022 by Delphix. All rights reserved. */ #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 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] == '\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, };