1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2013 RackTop Systems.
26 */
27
28 #include <stdio.h>
29 #include <libzfs.h>
30 #include <string.h>
31 #include <strings.h>
32 #include <errno.h>
33 #include <libshare.h>
34 #include "libshare_impl.h"
35 #include <libintl.h>
36 #include <sys/mnttab.h>
37 #include <sys/mntent.h>
38
39 extern sa_share_t _sa_add_share(sa_group_t, char *, int, int *, uint64_t);
40 extern sa_group_t _sa_create_zfs_group(sa_group_t, char *);
41 extern char *sa_fstype(char *);
42 extern void set_node_attr(void *, char *, char *);
43 extern boolean_t sa_is_share(void *);
44 extern void sa_update_sharetab_ts(sa_handle_t);
45
46 /*
47 * File system specific code for ZFS. The original code was stolen
48 * from the "zfs" command and modified to better suit this library's
49 * usage.
50 */
51
52 typedef struct get_all_cbdata {
53 zfs_handle_t **cb_handles;
54 size_t cb_alloc;
55 size_t cb_used;
56 uint_t cb_types;
57 } get_all_cbdata_t;
58
59 /*
60 * sa_zfs_init(handle)
61 *
62 * Initialize an access handle into libzfs. The handle needs to stay
63 * around until sa_zfs_fini() in order to maintain the cache of
64 * mounts.
65 */
66
67 int
68 sa_zfs_init(sa_handle_t handle)
69 {
70 handle->zfs_libhandle = libzfs_init();
71 if (handle->zfs_libhandle != NULL) {
72 libzfs_print_on_error(handle->zfs_libhandle, B_TRUE);
73 return (B_TRUE);
74 }
75 return (B_FALSE);
76 }
77
78 /*
79 * sa_zfs_fini(handle)
80 *
81 * cleanup data structures and the libzfs handle used for accessing
82 * zfs file share info.
83 */
84
85 void
86 sa_zfs_fini(sa_handle_t handle)
87 {
88 if (handle->zfs_libhandle != NULL) {
89 if (handle->zfs_list != NULL) {
90 zfs_handle_t **zhp = handle->zfs_list;
91 size_t i;
92
93 /*
94 * Contents of zfs_list need to be freed so we
95 * don't lose ZFS handles.
96 */
97 for (i = 0; i < handle->zfs_list_count; i++) {
98 zfs_close(zhp[i]);
99 }
100 free(handle->zfs_list);
101 handle->zfs_list = NULL;
102 handle->zfs_list_count = 0;
103 }
104
105 libzfs_fini(handle->zfs_libhandle);
106 handle->zfs_libhandle = NULL;
107 }
108 }
109
110 /*
111 * get_one_filesystem(zfs_handle_t, data)
112 *
113 * an iterator function called while iterating through the ZFS
114 * root. It accumulates into an array of file system handles that can
115 * be used to derive info about those file systems.
116 *
117 * Note that as this function is called, we close all zhp handles that
118 * are not going to be places into the cp_handles list. We don't want
119 * to close the ones we are keeping, but all others would be leaked if
120 * not closed here.
121 */
122
123 static int
124 get_one_filesystem(zfs_handle_t *zhp, void *data)
125 {
126 get_all_cbdata_t *cbp = data;
127 zfs_type_t type = zfs_get_type(zhp);
128
129 /*
130 * Interate over any nested datasets.
131 */
132 if (type == ZFS_TYPE_FILESYSTEM &&
133 zfs_iter_filesystems(zhp, get_one_filesystem, data) != 0) {
134 zfs_close(zhp);
135 return (1);
136 }
137
138 /*
139 * Skip any datasets whose type does not match.
140 */
141 if ((type & cbp->cb_types) == 0) {
142 zfs_close(zhp);
143 return (0);
144 }
145
146 if (cbp->cb_alloc == cbp->cb_used) {
147 zfs_handle_t **handles;
148
149 if (cbp->cb_alloc == 0)
150 cbp->cb_alloc = 64;
151 else
152 cbp->cb_alloc *= 2;
153
154 handles = (zfs_handle_t **)calloc(1,
155 cbp->cb_alloc * sizeof (void *));
156
157 if (handles == NULL) {
158 zfs_close(zhp);
159 return (0);
160 }
161 if (cbp->cb_handles) {
162 bcopy(cbp->cb_handles, handles,
163 cbp->cb_used * sizeof (void *));
164 free(cbp->cb_handles);
165 }
166
167 cbp->cb_handles = handles;
168 }
169
170 cbp->cb_handles[cbp->cb_used++] = zhp;
171
172 return (0);
173 }
174
175 /*
176 * get_all_filesystems(zfs_handle_t ***fslist, size_t *count)
177 *
178 * iterate through all ZFS file systems starting at the root. Returns
179 * a count and an array of handle pointers. Allocating is only done
180 * once. The caller does not need to free since it will be done at
181 * sa_zfs_fini() time.
182 */
183
184 static void
185 get_all_filesystems(sa_handle_t handle,
186 zfs_handle_t ***fslist, size_t *count)
187 {
188 get_all_cbdata_t cb = { 0 };
189 cb.cb_types = ZFS_TYPE_FILESYSTEM;
190
191 if (handle->zfs_list != NULL) {
192 *fslist = handle->zfs_list;
193 *count = handle->zfs_list_count;
194 return;
195 }
196
197 (void) zfs_iter_root(handle->zfs_libhandle,
198 get_one_filesystem, &cb);
199
200 handle->zfs_list = *fslist = cb.cb_handles;
201 handle->zfs_list_count = *count = cb.cb_used;
202 }
203
204 /*
205 * mountpoint_compare(a, b)
206 *
207 * compares the mountpoint on two zfs file systems handles.
208 * returns values following strcmp() model.
209 */
210
211 static int
212 mountpoint_compare(const void *a, const void *b)
213 {
214 zfs_handle_t **za = (zfs_handle_t **)a;
215 zfs_handle_t **zb = (zfs_handle_t **)b;
216 char mounta[MAXPATHLEN];
217 char mountb[MAXPATHLEN];
218
219 verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
220 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
221 verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
222 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
223
224 return (strcmp(mounta, mountb));
225 }
226
227 /*
228 * return legacy mountpoint. Caller provides space for mountpoint and
229 * dataset.
230 */
231 int
232 get_legacy_mountpoint(char *path, char *dataset, size_t dlen,
233 char *mountpoint, size_t mlen)
234 {
235 FILE *fp;
236 struct mnttab entry;
237
238 if ((fp = fopen(MNTTAB, "r")) == NULL) {
239 return (1);
240 }
241
242 while (getmntent(fp, &entry) == 0) {
243
244 if (entry.mnt_fstype == NULL ||
245 strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
246 continue;
247
248 if (strcmp(entry.mnt_mountp, path) == 0) {
249 if (mlen > 0)
250 (void) strlcpy(mountpoint, entry.mnt_mountp,
251 mlen);
252 if (dlen > 0)
253 (void) strlcpy(dataset, entry.mnt_special,
254 dlen);
255 break;
256 }
257 }
258 (void) fclose(fp);
259 return (1);
260 }
261
262 /*
263 * get_zfs_dataset(handle, path)
264 *
265 * get the name of the ZFS dataset the path is equivalent to. The
266 * dataset name is used for get/set of ZFS properties since libzfs
267 * requires a dataset to do a zfs_open().
268 */
269
270 static char *
271 get_zfs_dataset(sa_handle_t handle, char *path,
272 boolean_t search_mnttab)
273 {
274 size_t i, count = 0;
275 char *dataset = NULL;
276 zfs_handle_t **zlist;
277 char mountpoint[ZFS_MAXPROPLEN];
278 char canmount[ZFS_MAXPROPLEN];
279
280 get_all_filesystems(handle, &zlist, &count);
281 qsort(zlist, count, sizeof (void *), mountpoint_compare);
282 for (i = 0; i < count; i++) {
283 /* must have a mountpoint */
284 if (zfs_prop_get(zlist[i], ZFS_PROP_MOUNTPOINT, mountpoint,
285 sizeof (mountpoint), NULL, NULL, 0, B_FALSE) != 0) {
286 /* no mountpoint */
287 continue;
288 }
289
290 /* mountpoint must be a path */
291 if (strcmp(mountpoint, ZFS_MOUNTPOINT_NONE) == 0 ||
292 strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
293 /*
294 * Search mmttab for mountpoint and get dataset.
295 */
296
297 if (search_mnttab == B_TRUE &&
298 get_legacy_mountpoint(path, mountpoint,
299 sizeof (mountpoint), NULL, 0) == 0) {
300 dataset = mountpoint;
301 break;
302 }
303 continue;
304 }
305
306 /* canmount must be set */
307 canmount[0] = '\0';
308 if (zfs_prop_get(zlist[i], ZFS_PROP_CANMOUNT, canmount,
309 sizeof (canmount), NULL, NULL, 0, B_FALSE) != 0 ||
310 strcmp(canmount, "off") == 0)
311 continue;
312
313 /*
314 * have a mountable handle but want to skip those marked none
315 * and legacy
316 */
317 if (strcmp(mountpoint, path) == 0) {
318 dataset = (char *)zfs_get_name(zlist[i]);
319 break;
320 }
321
322 }
323
324 if (dataset != NULL)
325 dataset = strdup(dataset);
326
327 return (dataset);
328 }
329
330 /*
331 * get_zfs_property(dataset, property)
332 *
333 * Get the file system property specified from the ZFS dataset.
334 */
335
336 static char *
337 get_zfs_property(sa_handle_t handle, char *dataset, zfs_prop_t property)
338 {
339 zfs_handle_t *z_fs;
340 char shareopts[ZFS_MAXPROPLEN];
341
342 z_fs = zfs_open(handle->zfs_libhandle, dataset, ZFS_TYPE_FILESYSTEM);
343 if (z_fs != NULL) {
344 if (zfs_prop_get(z_fs, property, shareopts,
345 sizeof (shareopts), NULL, NULL, 0,
346 B_FALSE) == 0) {
347 zfs_close(z_fs);
348 return (strdup(shareopts));
349 }
350 zfs_close(z_fs);
351 }
352 return (NULL);
353 }
354
355 /*
356 * sa_zfs_is_shared(handle, path)
357 *
358 * Check to see if the ZFS path provided has the sharenfs option set
359 * or not.
360 */
361
362 boolean_t
363 sa_zfs_is_shared(sa_handle_t handle, char *path)
364 {
365 int ret = B_FALSE;
366 char *dataset;
367 zfs_handle_t *z_fs = NULL;
368 char shareopts[ZFS_MAXPROPLEN];
369
370 dataset = get_zfs_dataset(handle, path, B_FALSE);
371 if (dataset != NULL) {
372 z_fs = zfs_open(handle->zfs_libhandle, dataset,
373 ZFS_TYPE_FILESYSTEM);
374 if (z_fs != NULL) {
375 if (zfs_prop_get(z_fs, ZFS_PROP_SHARENFS,
376 shareopts, sizeof (shareopts), NULL, NULL,
377 0, B_FALSE) == 0 &&
378 strcmp(shareopts, "off") != 0) {
379 ret = B_TRUE; /* it is shared */
380 }
381 zfs_close(z_fs);
382 }
383 free(dataset);
384 }
385 return (ret);
386 }
387
388 /*
389 * find_or_create_group(handle, groupname, proto, *err)
390 *
391 * While walking the ZFS tree, we need to add shares to a defined
392 * group. If the group doesn't exist, create it first, making sure it
393 * is marked as a ZFS group.
394 *
395 * Note that all ZFS shares are in a subgroup of the top level group
396 * called "zfs".
397 */
398
399 static sa_group_t
400 find_or_create_group(sa_handle_t handle, char *groupname, char *proto, int *err)
401 {
402 sa_group_t group;
403 sa_optionset_t optionset;
404 int ret = SA_OK;
405
406 /*
407 * we check to see if the "zfs" group exists. Since this
408 * should be the top level group, we don't want the
409 * parent. This is to make sure the zfs group has been created
410 * and to created if it hasn't been.
411 */
412 group = sa_get_group(handle, groupname);
413 if (group == NULL) {
414 group = sa_create_group(handle, groupname, &ret);
415
416 /* make sure this is flagged as a ZFS group */
417 if (group != NULL)
418 ret = sa_set_group_attr(group, "zfs", "true");
419 }
420 if (group != NULL) {
421 if (proto != NULL) {
422 optionset = sa_get_optionset(group, proto);
423 if (optionset == NULL)
424 optionset = sa_create_optionset(group, proto);
425 }
426 }
427 if (err != NULL)
428 *err = ret;
429 return (group);
430 }
431
432 /*
433 * find_or_create_zfs_subgroup(groupname, optstring, *err)
434 *
435 * ZFS shares will be in a subgroup of the "zfs" master group. This
436 * function looks to see if the groupname exists and returns it if it
437 * does or else creates a new one with the specified name and returns
438 * that. The "zfs" group will exist before we get here, but we make
439 * sure just in case.
440 *
441 * err must be a valid pointer.
442 */
443
444 static sa_group_t
445 find_or_create_zfs_subgroup(sa_handle_t handle, char *groupname, char *proto,
446 char *optstring, int *err)
447 {
448 sa_group_t group = NULL;
449 sa_group_t zfs;
450 char *name;
451 char *options;
452
453 /* start with the top-level "zfs" group */
454 zfs = sa_get_group(handle, "zfs");
455 *err = SA_OK;
456 if (zfs != NULL) {
457 for (group = sa_get_sub_group(zfs); group != NULL;
458 group = sa_get_next_group(group)) {
459 name = sa_get_group_attr(group, "name");
460 if (name != NULL && strcmp(name, groupname) == 0) {
461 /* have the group so break out of here */
462 sa_free_attr_string(name);
463 break;
464 }
465 if (name != NULL)
466 sa_free_attr_string(name);
467 }
468
469 if (group == NULL) {
470 /*
471 * Need to create the sub-group since it doesn't exist
472 */
473 group = _sa_create_zfs_group(zfs, groupname);
474 if (group == NULL) {
475 *err = SA_NO_MEMORY;
476 return (NULL);
477 }
478 set_node_attr(group, "zfs", "true");
479 }
480 if (strcmp(optstring, "on") == 0)
481 optstring = "rw";
482 options = strdup(optstring);
483 if (options != NULL) {
484 *err = sa_parse_legacy_options(group, options,
485 proto);
486 /* If no optionset, add one. */
487 if (sa_get_optionset(group, proto) == NULL)
488 (void) sa_create_optionset(group, proto);
489
490 /*
491 * Do not forget to update an optionset of
492 * the parent group so that it contains
493 * all protocols its subgroups have.
494 */
495 if (sa_get_optionset(zfs, proto) == NULL)
496 (void) sa_create_optionset(zfs, proto);
497
498 free(options);
499 } else {
500 *err = SA_NO_MEMORY;
501 }
502 }
503 return (group);
504 }
505
506 /*
507 * zfs_construct_resource(share, name, base, dataset)
508 *
509 * Add a resource to the share using name as a template. If name ==
510 * NULL, then construct a name based on the dataset value.
511 * name.
512 */
513 static void
514 zfs_construct_resource(sa_share_t share, char *dataset)
515 {
516 char buff[SA_MAX_RESOURCE_NAME + 1];
517 int ret = SA_OK;
518
519 (void) snprintf(buff, SA_MAX_RESOURCE_NAME, "%s", dataset);
520 sa_fix_resource_name(buff);
521 (void) sa_add_resource(share, buff, SA_SHARE_TRANSIENT, &ret);
522 }
523
524 /*
525 * zfs_inherited(handle, source, sourcestr)
526 *
527 * handle case of inherited share{nfs,smb}. Pulled out of sa_get_zfs_shares
528 * for readability.
529 */
530 static int
531 zfs_inherited(sa_handle_t handle, sa_share_t share, char *sourcestr,
532 char *shareopts, char *mountpoint, char *proto, char *dataset)
533 {
534 int doshopt = 0;
535 int err = SA_OK;
536 sa_group_t group;
537 sa_resource_t resource;
538 uint64_t features;
539
540 /*
541 * Need to find the "real" parent sub-group. It may not be
542 * mounted, but it was identified in the "sourcestr"
543 * variable. The real parent not mounted can occur if
544 * "canmount=off and sharenfs=on".
545 */
546 group = find_or_create_zfs_subgroup(handle, sourcestr, proto,
547 shareopts, &doshopt);
548 if (group != NULL) {
549 /*
550 * We may need the first share for resource
551 * prototype. We only care about it if it has a
552 * resource that sets a prefix value.
553 */
554 if (share == NULL)
555 share = _sa_add_share(group, mountpoint,
556 SA_SHARE_TRANSIENT, &err,
557 (uint64_t)SA_FEATURE_NONE);
558 /*
559 * some options may only be on shares. If the opt
560 * string contains one of those, we put it just on the
561 * share.
562 */
563 if (share != NULL && doshopt == SA_PROP_SHARE_ONLY) {
564 char *options;
565 options = strdup(shareopts);
566 if (options != NULL) {
567 set_node_attr(share, "dataset", dataset);
568 err = sa_parse_legacy_options(share, options,
569 proto);
570 set_node_attr(share, "dataset", NULL);
571 free(options);
572 }
573 if (sa_get_optionset(group, proto) == NULL)
574 (void) sa_create_optionset(group, proto);
575 }
576 features = sa_proto_get_featureset(proto);
577 if (share != NULL && features & SA_FEATURE_RESOURCE) {
578 /*
579 * We have a share and the protocol requires
580 * that at least one resource exist (probably
581 * SMB). We need to make sure that there is at
582 * least one.
583 */
584 resource = sa_get_share_resource(share, NULL);
585 if (resource == NULL) {
586 zfs_construct_resource(share, dataset);
587 }
588 }
589 } else {
590 err = SA_NO_MEMORY;
591 }
592 return (err);
593 }
594
595 /*
596 * zfs_notinherited(group, share, mountpoint, shareopts, proto, dataset,
597 * grouperr)
598 *
599 * handle case where this is the top of a sub-group in ZFS. Pulled out
600 * of sa_get_zfs_shares for readability. We need the grouperr from the
601 * creation of the subgroup to know whether to add the public
602 * property, etc. to the specific share.
603 */
604 static int
605 zfs_notinherited(sa_group_t group, sa_share_t share, char *mountpoint,
606 char *shareopts, char *proto, char *dataset, int grouperr)
607 {
608 int err = SA_OK;
609 sa_resource_t resource;
610 uint64_t features;
611
612 set_node_attr(group, "zfs", "true");
613 if (share == NULL)
614 share = _sa_add_share(group, mountpoint, SA_SHARE_TRANSIENT,
615 &err, (uint64_t)SA_FEATURE_NONE);
616
617 if (err != SA_OK)
618 return (err);
619
620 if (strcmp(shareopts, "on") == 0)
621 shareopts = "";
622 if (shareopts != NULL) {
623 char *options;
624 if (grouperr == SA_PROP_SHARE_ONLY) {
625 /*
626 * Some properties may only be on shares, but
627 * due to the ZFS sub-groups being artificial,
628 * we sometimes get this and have to deal with
629 * it. We do it by attempting to put it on the
630 * share.
631 */
632 options = strdup(shareopts);
633 if (options != NULL) {
634 err = sa_parse_legacy_options(share,
635 options, proto);
636 free(options);
637 }
638 }
639 /* Unmark the share's changed state */
640 set_node_attr(share, "changed", NULL);
641 }
642 features = sa_proto_get_featureset(proto);
643 if (share != NULL && features & SA_FEATURE_RESOURCE) {
644 /*
645 * We have a share and the protocol requires that at
646 * least one resource exist (probably SMB). We need to
647 * make sure that there is at least one.
648 */
649 resource = sa_get_share_resource(share, NULL);
650 if (resource == NULL) {
651 zfs_construct_resource(share, dataset);
652 }
653 }
654 return (err);
655 }
656
657 /*
658 * zfs_grp_error(err)
659 *
660 * Print group create error, but only once. If err is 0 do the
661 * print else don't.
662 */
663
664 static void
665 zfs_grp_error(int err)
666 {
667 if (err == 0) {
668 /* only print error once */
669 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
670 "Cannot create ZFS subgroup during initialization:"
671 " %s\n"), sa_errorstr(SA_SYSTEM_ERR));
672 }
673 }
674
675 /*
676 * zfs_process_share(handle, share, mountpoint, proto, source,
677 * shareopts, sourcestr)
678 *
679 * Creates the subgroup, if necessary and adds shares, resources
680 * and properties.
681 */
682 int
683 sa_zfs_process_share(sa_handle_t handle, sa_group_t group, sa_share_t share,
684 char *mountpoint, char *proto, zprop_source_t source, char *shareopts,
685 char *sourcestr, char *dataset)
686 {
687 int err = SA_OK;
688
689 if (source & ZPROP_SRC_INHERITED) {
690 err = zfs_inherited(handle, share, sourcestr, shareopts,
691 mountpoint, proto, dataset);
692 } else {
693 group = find_or_create_zfs_subgroup(handle, dataset, proto,
694 shareopts, &err);
695 if (group == NULL) {
696 static boolean_t reported_error = B_FALSE;
697 /*
698 * There is a problem, but we can't do
699 * anything about it at this point so we issue
700 * a warning and move on.
701 */
702 zfs_grp_error(reported_error);
703 reported_error = B_TRUE;
704 }
705 set_node_attr(group, "zfs", "true");
706 /*
707 * Add share with local opts via zfs_notinherited.
708 */
709 err = zfs_notinherited(group, share, mountpoint, shareopts,
710 proto, dataset, err);
711 }
712 return (err);
713 }
714
715 /*
716 * sa_get_zfs_shares(handle, groupname)
717 *
718 * Walk the mnttab for all zfs mounts and determine which are
719 * shared. Find or create the appropriate group/sub-group to contain
720 * the shares.
721 *
722 * All shares are in a sub-group that will hold the properties. This
723 * allows representing the inherited property model.
724 *
725 * One area of complication is if "sharenfs" is set at one level of
726 * the directory tree and "sharesmb" is set at a different level, the
727 * a sub-group must be formed at the lower level for both
728 * protocols. That is the nature of the problem in CR 6667349.
729 */
730
731 int
732 sa_get_zfs_shares(sa_handle_t handle, char *groupname)
733 {
734 sa_group_t zfsgroup;
735 boolean_t nfs;
736 boolean_t nfs_inherited;
737 boolean_t smb;
738 boolean_t smb_inherited;
739 zfs_handle_t **zlist;
740 char nfsshareopts[ZFS_MAXPROPLEN];
741 char smbshareopts[ZFS_MAXPROPLEN];
742 sa_share_t share;
743 zprop_source_t source;
744 char nfssourcestr[ZFS_MAXPROPLEN];
745 char smbsourcestr[ZFS_MAXPROPLEN];
746 char mountpoint[ZFS_MAXPROPLEN];
747 size_t count = 0, i;
748 libzfs_handle_t *zfs_libhandle;
749 int err = SA_OK;
750
751 /*
752 * If we can't access libzfs, don't bother doing anything.
753 */
754 zfs_libhandle = handle->zfs_libhandle;
755 if (zfs_libhandle == NULL)
756 return (SA_SYSTEM_ERR);
757
758 zfsgroup = find_or_create_group(handle, groupname, NULL, &err);
759 /* Not an error, this could be a legacy condition */
760 if (zfsgroup == NULL)
761 return (SA_OK);
762
763 /*
764 * need to walk the mounted ZFS pools and datasets to
765 * find shares that are possible.
766 */
767 get_all_filesystems(handle, &zlist, &count);
768 qsort(zlist, count, sizeof (void *), mountpoint_compare);
769
770 for (i = 0; i < count; i++) {
771 char *dataset;
772
773 source = ZPROP_SRC_ALL;
774 /* If no mountpoint, skip. */
775 if (zfs_prop_get(zlist[i], ZFS_PROP_MOUNTPOINT,
776 mountpoint, sizeof (mountpoint), NULL, NULL, 0,
777 B_FALSE) != 0)
778 continue;
779
780 /*
781 * zfs_get_name value must not be freed. It is just a
782 * pointer to a value in the handle.
783 */
784 if ((dataset = (char *)zfs_get_name(zlist[i])) == NULL)
785 continue;
786
787 /*
788 * only deal with "mounted" file systems since
789 * unmounted file systems can't actually be shared.
790 */
791
792 if (!zfs_is_mounted(zlist[i], NULL))
793 continue;
794
795 nfs = nfs_inherited = B_FALSE;
796
797 if (zfs_prop_get(zlist[i], ZFS_PROP_SHARENFS, nfsshareopts,
798 sizeof (nfsshareopts), &source, nfssourcestr,
799 ZFS_MAXPROPLEN, B_FALSE) == 0 &&
800 strcmp(nfsshareopts, "off") != 0) {
801 if (source & ZPROP_SRC_INHERITED)
802 nfs_inherited = B_TRUE;
803 else
804 nfs = B_TRUE;
805 }
806
807 smb = smb_inherited = B_FALSE;
808 if (zfs_prop_get(zlist[i], ZFS_PROP_SHARESMB, smbshareopts,
809 sizeof (smbshareopts), &source, smbsourcestr,
810 ZFS_MAXPROPLEN, B_FALSE) == 0 &&
811 strcmp(smbshareopts, "off") != 0) {
812 if (source & ZPROP_SRC_INHERITED)
813 smb_inherited = B_TRUE;
814 else
815 smb = B_TRUE;
816 }
817
818 /*
819 * If the mountpoint is already shared, it must be a
820 * non-ZFS share. We want to remove the share from its
821 * parent group and reshare it under ZFS.
822 */
823 share = sa_find_share(handle, mountpoint);
824 if (share != NULL &&
825 (nfs || smb || nfs_inherited || smb_inherited)) {
826 err = sa_remove_share(share);
827 share = NULL;
828 }
829
830 /*
831 * At this point, we have the information needed to
832 * determine what to do with the share.
833 *
834 * If smb or nfs is set, we have a new sub-group.
835 * If smb_inherit and/or nfs_inherit is set, then
836 * place on an existing sub-group. If both are set,
837 * the existing sub-group is the closest up the tree.
838 */
839 if (nfs || smb) {
840 /*
841 * Non-inherited is the straightforward
842 * case. sa_zfs_process_share handles it
843 * directly. Make sure that if the "other"
844 * protocol is inherited, that we treat it as
845 * non-inherited as well.
846 */
847 if (nfs || nfs_inherited) {
848 err = sa_zfs_process_share(handle, zfsgroup,
849 share, mountpoint, "nfs",
850 0, nfsshareopts,
851 nfssourcestr, dataset);
852 share = sa_find_share(handle, mountpoint);
853 }
854 if (smb || smb_inherited) {
855 err = sa_zfs_process_share(handle, zfsgroup,
856 share, mountpoint, "smb",
857 0, smbshareopts,
858 smbsourcestr, dataset);
859 }
860 } else if (nfs_inherited || smb_inherited) {
861 char *grpdataset;
862 /*
863 * If we only have inherited groups, it is
864 * important to find the closer of the two if
865 * the protocols are set at different
866 * levels. The closest sub-group is the one we
867 * want to work with.
868 */
869 if (nfs_inherited && smb_inherited) {
870 if (strcmp(nfssourcestr, smbsourcestr) <= 0)
871 grpdataset = nfssourcestr;
872 else
873 grpdataset = smbsourcestr;
874 } else if (nfs_inherited) {
875 grpdataset = nfssourcestr;
876 } else if (smb_inherited) {
877 grpdataset = smbsourcestr;
878 }
879 if (nfs_inherited) {
880 err = sa_zfs_process_share(handle, zfsgroup,
881 share, mountpoint, "nfs",
882 ZPROP_SRC_INHERITED, nfsshareopts,
883 grpdataset, dataset);
884 share = sa_find_share(handle, mountpoint);
885 }
886 if (smb_inherited) {
887 err = sa_zfs_process_share(handle, zfsgroup,
888 share, mountpoint, "smb",
889 ZPROP_SRC_INHERITED, smbshareopts,
890 grpdataset, dataset);
891 }
892 }
893 }
894 /*
895 * Don't need to free the "zlist" variable since it is only a
896 * pointer to a cached value that will be freed when
897 * sa_fini() is called.
898 */
899 return (err);
900 }
901
902 #define COMMAND "/usr/sbin/zfs"
903
904 /*
905 * sa_zfs_set_sharenfs(group, path, on)
906 *
907 * Update the "sharenfs" property on the path. If on is true, then set
908 * to the properties on the group or "on" if no properties are
909 * defined. Set to "off" if on is false.
910 */
911
912 int
913 sa_zfs_set_sharenfs(sa_group_t group, char *path, int on)
914 {
915 int ret = SA_NOT_IMPLEMENTED;
916 char *command;
917
918 command = malloc(ZFS_MAXPROPLEN * 2);
919 if (command != NULL) {
920 char *opts = NULL;
921 char *dataset = NULL;
922 FILE *pfile;
923 sa_handle_t handle;
924 /* for now, NFS is always available for "zfs" */
925 if (on) {
926 opts = sa_proto_legacy_format("nfs", group, 1);
927 if (opts != NULL && strlen(opts) == 0) {
928 free(opts);
929 opts = strdup("on");
930 }
931 }
932
933 handle = sa_find_group_handle(group);
934 assert(handle != NULL);
935 if (handle != NULL)
936 dataset = get_zfs_dataset(handle, path, B_FALSE);
937 else
938 ret = SA_SYSTEM_ERR;
939
940 if (dataset != NULL) {
941 (void) snprintf(command, ZFS_MAXPROPLEN * 2,
942 "%s set sharenfs=\"%s\" %s", COMMAND,
943 opts != NULL ? opts : "off", dataset);
944 pfile = popen(command, "r");
945 if (pfile != NULL) {
946 ret = pclose(pfile);
947 if (ret != 0)
948 ret = SA_SYSTEM_ERR;
949 }
950 }
951 if (opts != NULL)
952 free(opts);
953 if (dataset != NULL)
954 free(dataset);
955 free(command);
956 }
957 return (ret);
958 }
959
960 /*
961 * add_resources(share, opt)
962 *
963 * Add resource properties to those in "opt". Resources are prefixed
964 * with name=resourcename.
965 */
966 static char *
967 add_resources(sa_share_t share, char *opt)
968 {
969 char *newopt = NULL;
970 char *propstr;
971 sa_resource_t resource;
972
973 newopt = strdup(opt);
974 if (newopt == NULL)
975 return (newopt);
976
977 for (resource = sa_get_share_resource(share, NULL);
978 resource != NULL;
979 resource = sa_get_next_resource(resource)) {
980 char *name;
981 size_t size;
982
983 name = sa_get_resource_attr(resource, "name");
984 if (name == NULL) {
985 free(newopt);
986 return (NULL);
987 }
988 size = strlen(name) + strlen(opt) + sizeof ("name=") + 1;
989 newopt = calloc(1, size);
990 if (newopt != NULL)
991 (void) snprintf(newopt, size, "%s,name=%s", opt, name);
992 sa_free_attr_string(name);
993 free(opt);
994 opt = newopt;
995 propstr = sa_proto_legacy_format("smb", resource, 0);
996 if (propstr == NULL) {
997 free(opt);
998 return (NULL);
999 }
1000 size = strlen(propstr) + strlen(opt) + 2;
1001 newopt = calloc(1, size);
1002 if (newopt != NULL)
1003 (void) snprintf(newopt, size, "%s,%s", opt, propstr);
1004 free(opt);
1005 opt = newopt;
1006 }
1007 return (opt);
1008 }
1009
1010 /*
1011 * sa_zfs_set_sharesmb(group, path, on)
1012 *
1013 * Update the "sharesmb" property on the path. If on is true, then set
1014 * to the properties on the group or "on" if no properties are
1015 * defined. Set to "off" if on is false.
1016 */
1017
1018 int
1019 sa_zfs_set_sharesmb(sa_group_t group, char *path, int on)
1020 {
1021 int ret = SA_NOT_IMPLEMENTED;
1022 char *command;
1023 sa_share_t share;
1024
1025 /* In case SMB not enabled */
1026 if (sa_get_optionset(group, "smb") == NULL)
1027 return (SA_NOT_SUPPORTED);
1028
1029 command = malloc(ZFS_MAXPROPLEN * 2);
1030 if (command != NULL) {
1031 char *opts = NULL;
1032 char *dataset = NULL;
1033 FILE *pfile;
1034 sa_handle_t handle;
1035
1036 if (on) {
1037 char *newopt;
1038
1039 share = sa_get_share(group, NULL);
1040 opts = sa_proto_legacy_format("smb", share, 1);
1041 if (opts != NULL && strlen(opts) == 0) {
1042 free(opts);
1043 opts = strdup("on");
1044 }
1045 newopt = add_resources(opts, share);
1046 free(opts);
1047 opts = newopt;
1048 }
1049
1050 handle = sa_find_group_handle(group);
1051 assert(handle != NULL);
1052 if (handle != NULL)
1053 dataset = get_zfs_dataset(handle, path, B_FALSE);
1054 else
1055 ret = SA_SYSTEM_ERR;
1056
1057 if (dataset != NULL) {
1058 (void) snprintf(command, ZFS_MAXPROPLEN * 2,
1059 "echo %s set sharesmb=\"%s\" %s", COMMAND,
1060 opts != NULL ? opts : "off", dataset);
1061 pfile = popen(command, "r");
1062 if (pfile != NULL) {
1063 ret = pclose(pfile);
1064 if (ret != 0)
1065 ret = SA_SYSTEM_ERR;
1066 }
1067 }
1068 if (opts != NULL)
1069 free(opts);
1070 if (dataset != NULL)
1071 free(dataset);
1072 free(command);
1073 }
1074 return (ret);
1075 }
1076
1077 /*
1078 * sa_zfs_update(group)
1079 *
1080 * call back to ZFS to update the share if necessary.
1081 * Don't do it if it isn't a real change.
1082 */
1083 int
1084 sa_zfs_update(sa_group_t group)
1085 {
1086 sa_optionset_t protopt;
1087 sa_group_t parent;
1088 char *command;
1089 char *optstring;
1090 int ret = SA_OK;
1091 int doupdate = 0;
1092 FILE *pfile;
1093
1094 if (sa_is_share(group))
1095 parent = sa_get_parent_group(group);
1096 else
1097 parent = group;
1098
1099 if (parent != NULL) {
1100 command = malloc(ZFS_MAXPROPLEN * 2);
1101 if (command == NULL)
1102 return (SA_NO_MEMORY);
1103
1104 *command = '\0';
1105 for (protopt = sa_get_optionset(parent, NULL); protopt != NULL;
1106 protopt = sa_get_next_optionset(protopt)) {
1107
1108 char *proto = sa_get_optionset_attr(protopt, "type");
1109 char *path;
1110 char *dataset = NULL;
1111 char *zfsopts = NULL;
1112
1113 if (sa_is_share(group)) {
1114 path = sa_get_share_attr((sa_share_t)group,
1115 "path");
1116 if (path != NULL) {
1117 sa_handle_t handle;
1118
1119 handle = sa_find_group_handle(
1120 group);
1121 if (handle != NULL)
1122 dataset = get_zfs_dataset(
1123 handle, path, B_FALSE);
1124 else
1125 ret = SA_SYSTEM_ERR;
1126
1127 sa_free_attr_string(path);
1128 }
1129 } else {
1130 dataset = sa_get_group_attr(group, "name");
1131 }
1132 /* update only when there is an optstring found */
1133 doupdate = 0;
1134 if (proto != NULL && dataset != NULL) {
1135 sa_handle_t handle;
1136
1137 optstring = sa_proto_legacy_format(proto,
1138 group, 1);
1139 handle = sa_find_group_handle(group);
1140 zfsopts = get_zfs_property(handle, dataset,
1141 ZFS_PROP_SHARENFS);
1142
1143 if (optstring != NULL && zfsopts != NULL) {
1144 if (strcmp(optstring, zfsopts) != 0)
1145 doupdate++;
1146 }
1147 if (doupdate) {
1148 if (optstring != NULL &&
1149 strlen(optstring) > 0) {
1150 (void) snprintf(command,
1151 ZFS_MAXPROPLEN * 2,
1152 "%s set share%s=%s %s",
1153 COMMAND, proto,
1154 optstring, dataset);
1155 } else {
1156 (void) snprintf(command,
1157 ZFS_MAXPROPLEN * 2,
1158 "%s set share%s=on %s",
1159 COMMAND, proto,
1160 dataset);
1161 }
1162 pfile = popen(command, "r");
1163 if (pfile != NULL)
1164 ret = pclose(pfile);
1165 switch (ret) {
1166 default:
1167 case 1:
1168 ret = SA_SYSTEM_ERR;
1169 break;
1170 case 2:
1171 ret = SA_SYNTAX_ERR;
1172 break;
1173 case 0:
1174 break;
1175 }
1176 }
1177 if (optstring != NULL)
1178 free(optstring);
1179 if (zfsopts != NULL)
1180 free(zfsopts);
1181 }
1182 if (proto != NULL)
1183 sa_free_attr_string(proto);
1184 if (dataset != NULL)
1185 free(dataset);
1186 }
1187 free(command);
1188 }
1189 return (ret);
1190 }
1191
1192 /*
1193 * sa_group_is_zfs(group)
1194 *
1195 * Given the group, determine if the zfs attribute is set.
1196 */
1197
1198 boolean_t
1199 sa_group_is_zfs(sa_group_t group)
1200 {
1201 char *zfs;
1202 int ret = B_FALSE;
1203
1204 zfs = sa_get_group_attr(group, "zfs");
1205 if (zfs != NULL) {
1206 ret = B_TRUE;
1207 sa_free_attr_string(zfs);
1208 }
1209 return (ret);
1210 }
1211
1212 /*
1213 * sa_path_is_zfs(path)
1214 *
1215 * Check to see if the file system path represents is of type "zfs".
1216 */
1217
1218 boolean_t
1219 sa_path_is_zfs(char *path)
1220 {
1221 char *fstype;
1222 int ret = B_FALSE;
1223
1224 fstype = sa_fstype(path);
1225 if (fstype != NULL && strcmp(fstype, "zfs") == 0)
1226 ret = B_TRUE;
1227 if (fstype != NULL)
1228 sa_free_fstype(fstype);
1229 return (ret);
1230 }
1231
1232 int
1233 sa_sharetab_fill_zfs(sa_share_t share, share_t *sh, char *proto)
1234 {
1235 char *path;
1236
1237 /* Make sure path is valid */
1238
1239 path = sa_get_share_attr(share, "path");
1240 if (path != NULL) {
1241 (void) memset(sh, 0, sizeof (sh));
1242 (void) sa_fillshare(share, proto, sh);
1243 sa_free_attr_string(path);
1244 return (0);
1245 } else
1246 return (1);
1247 }
1248
1249 #define SMAX(i, j) \
1250 if ((j) > (i)) { \
1251 (i) = (j); \
1252 }
1253
1254 int
1255 sa_share_zfs(sa_share_t share, sa_resource_t resource, char *path, share_t *sh,
1256 void *exportdata, zfs_share_op_t operation)
1257 {
1258 sa_group_t group;
1259 sa_handle_t handle;
1260 char *dataset;
1261 int err = EINVAL;
1262 int i, j;
1263 char newpath[MAXPATHLEN];
1264 char *pathp;
1265 char *resource_name;
1266
1267 /*
1268 * First find the dataset name
1269 */
1270 if ((group = sa_get_parent_group(share)) == NULL) {
1271 return (EINVAL);
1272 }
1273 if ((handle = sa_find_group_handle(group)) == NULL) {
1274 return (EINVAL);
1275 }
1276
1277 /*
1278 * If get_zfs_dataset fails, see if it is a subdirectory
1279 */
1280
1281 pathp = path;
1282 while ((dataset = get_zfs_dataset(handle, pathp, B_TRUE)) == NULL) {
1283 char *p;
1284
1285 if (pathp == path) {
1286 (void) strlcpy(newpath, path, sizeof (newpath));
1287 pathp = newpath;
1288 }
1289
1290 /*
1291 * Make sure only one leading '/' This condition came
1292 * about when using HAStoragePlus which insisted on
1293 * putting an extra leading '/' in the ZFS path
1294 * name. The problem is fixed in other areas, but this
1295 * will catch any other ways that a double slash might
1296 * get introduced.
1297 */
1298 while (*pathp == '/' && *(pathp + 1) == '/')
1299 pathp++;
1300
1301 /*
1302 * chop off part of path, but if we are at root then
1303 * make sure path is a /
1304 */
1305 if ((strlen(pathp) > 1) && (p = strrchr(pathp, '/'))) {
1306 if (pathp == p) {
1307 *(p + 1) = '\0'; /* skip over /, root case */
1308 } else {
1309 *p = '\0';
1310 }
1311 } else {
1312 return (EINVAL);
1313 }
1314 }
1315
1316 i = (sh->sh_path ? strlen(sh->sh_path) : 0);
1317 sh->sh_size = i;
1318
1319 j = (sh->sh_res ? strlen(sh->sh_res) : 0);
1320 sh->sh_size += j;
1321 SMAX(i, j);
1322
1323 j = (sh->sh_fstype ? strlen(sh->sh_fstype) : 0);
1324 sh->sh_size += j;
1325 SMAX(i, j);
1326
1327 j = (sh->sh_opts ? strlen(sh->sh_opts) : 0);
1328 sh->sh_size += j;
1329 SMAX(i, j);
1330
1331 j = (sh->sh_descr ? strlen(sh->sh_descr) : 0);
1332 sh->sh_size += j;
1333 SMAX(i, j);
1334
1335 resource_name = sa_get_resource_attr(resource, "name");
1336
1337 err = zfs_deleg_share_nfs(handle->zfs_libhandle, dataset, path,
1338 resource_name, exportdata, sh, i, operation);
1339 if (err == SA_OK)
1340 sa_update_sharetab_ts(handle);
1341 else
1342 err = errno;
1343 if (resource_name != NULL)
1344 sa_free_attr_string(resource_name);
1345
1346 free(dataset);
1347 return (err);
1348 }
1349
1350 /*
1351 * sa_get_zfs_handle(handle)
1352 *
1353 * Given an sa_handle_t, return the libzfs_handle_t *. This is only
1354 * used internally by libzfs. Needed in order to avoid including
1355 * libshare_impl.h in libzfs.
1356 */
1357
1358 libzfs_handle_t *
1359 sa_get_zfs_handle(sa_handle_t handle)
1360 {
1361 return (handle->zfs_libhandle);
1362 }
1363
1364 /*
1365 * This method builds values for "sharesmb" property from the
1366 * nvlist argument. The values are returned in sharesmb_val variable.
1367 */
1368 static int
1369 sa_zfs_sprintf_new_prop(nvlist_t *nvl, char *sharesmb_val)
1370 {
1371 char cur_val[ZFS_MAXPROPLEN];
1372 char *name, *val;
1373 nvpair_t *cur;
1374 int err = 0;
1375
1376 cur = nvlist_next_nvpair(nvl, NULL);
1377 while (cur != NULL) {
1378 name = nvpair_name(cur);
1379 err = nvpair_value_string(cur, &val);
1380 if ((err != 0) || (name == NULL) || (val == NULL))
1381 return (-1);
1382
1383 (void) snprintf(cur_val, ZFS_MAXPROPLEN, "%s=%s,", name, val);
1384 (void) strlcat(sharesmb_val, cur_val, ZFS_MAXPROPLEN);
1385
1386 cur = nvlist_next_nvpair(nvl, cur);
1387 }
1388
1389 return (0);
1390 }
1391
1392 /*
1393 * This method builds values for "sharesmb" property from values
1394 * already existing on the share. The properties set via sa_zfs_sprint_new_prop
1395 * method are passed in sharesmb_val. If a existing property is already
1396 * set via sa_zfs_sprint_new_prop method, then they are not appended
1397 * to the sharesmb_val string. The returned sharesmb_val string is a combination
1398 * of new and existing values for 'sharesmb' property.
1399 */
1400 static int
1401 sa_zfs_sprintf_existing_prop(zfs_handle_t *handle, char *sharesmb_val)
1402 {
1403 char shareopts[ZFS_MAXPROPLEN], cur_val[ZFS_MAXPROPLEN];
1404 char *token, *last, *value;
1405
1406 if (zfs_prop_get(handle, ZFS_PROP_SHARESMB, shareopts,
1407 sizeof (shareopts), NULL, NULL, 0, B_FALSE) != 0)
1408 return (-1);
1409
1410 if (strstr(shareopts, "=") == NULL)
1411 return (0);
1412
1413 for (token = strtok_r(shareopts, ",", &last); token != NULL;
1414 token = strtok_r(NULL, ",", &last)) {
1415 value = strchr(token, '=');
1416 if (value == NULL)
1417 return (-1);
1418 *value++ = '\0';
1419
1420 (void) snprintf(cur_val, ZFS_MAXPROPLEN, "%s=", token);
1421 if (strstr(sharesmb_val, cur_val) == NULL) {
1422 (void) strlcat(cur_val, value, ZFS_MAXPROPLEN);
1423 (void) strlcat(cur_val, ",", ZFS_MAXPROPLEN);
1424 (void) strlcat(sharesmb_val, cur_val, ZFS_MAXPROPLEN);
1425 }
1426 }
1427
1428 return (0);
1429 }
1430
1431 /*
1432 * Sets the share properties on a ZFS share. For now, this method sets only
1433 * the "sharesmb" property.
1434 *
1435 * This method includes building a comma seperated name-value string to be
1436 * set on the "sharesmb" property of a ZFS share. This name-value string is
1437 * build in 2 steps:
1438 * - New property values given as name-value pair are set first.
1439 * - Existing optionset properties, which are not part of the new properties
1440 * passed in step 1, are appended to the newly set properties.
1441 */
1442 int
1443 sa_zfs_setprop(sa_handle_t handle, char *path, nvlist_t *nvl)
1444 {
1445 zfs_handle_t *z_fs;
1446 char sharesmb_val[ZFS_MAXPROPLEN];
1447 char *dataset, *lastcomma;
1448
1449 if (nvlist_empty(nvl))
1450 return (0);
1451
1452 if ((handle == NULL) || (path == NULL))
1453 return (-1);
1454
1455 if ((dataset = get_zfs_dataset(handle, path, B_FALSE)) == NULL)
1456 return (-1);
1457
1458 z_fs = zfs_open(handle->zfs_libhandle, dataset, ZFS_TYPE_DATASET);
1459 if (z_fs == NULL) {
1460 free(dataset);
1461 return (-1);
1462 }
1463
1464 bzero(sharesmb_val, ZFS_MAXPROPLEN);
1465 if (sa_zfs_sprintf_new_prop(nvl, sharesmb_val) != 0) {
1466 free(dataset);
1467 zfs_close(z_fs);
1468 return (-1);
1469 }
1470
1471 if (sa_zfs_sprintf_existing_prop(z_fs, sharesmb_val) != 0) {
1472 free(dataset);
1473 zfs_close(z_fs);
1474 return (-1);
1475 }
1476
1477 lastcomma = strrchr(sharesmb_val, ',');
1478 if ((lastcomma != NULL) && (lastcomma[1] == '\0'))
1479 *lastcomma = '\0';
1480
1481 (void) zfs_prop_set(z_fs, zfs_prop_to_name(ZFS_PROP_SHARESMB),
1482 sharesmb_val);
1483 free(dataset);
1484 zfs_close(z_fs);
1485
1486 return (0);
1487 }