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46e18b3f GB |
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) 2002, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Copyright (c) 2011 Gunnar Beutner | |
27ccd414 | 25 | * Copyright (c) 2012 Cyril Plisko. All rights reserved. |
46e18b3f GB |
26 | */ |
27 | ||
28 | #include <stdio.h> | |
29 | #include <strings.h> | |
30 | #include <fcntl.h> | |
31 | #include <sys/wait.h> | |
32 | #include <unistd.h> | |
33 | #include <libzfs.h> | |
34 | #include <libshare.h> | |
35 | #include "libshare_impl.h" | |
36 | ||
27ccd414 CP |
37 | static boolean_t nfs_available(void); |
38 | ||
46e18b3f | 39 | static sa_fstype_t *nfs_fstype; |
46e18b3f | 40 | |
5333eb0b J |
41 | /* |
42 | * nfs_exportfs_temp_fd refers to a temporary copy of the output | |
43 | * from exportfs -v. | |
44 | */ | |
45 | static int nfs_exportfs_temp_fd = -1; | |
46 | ||
46e18b3f GB |
47 | typedef int (*nfs_shareopt_callback_t)(const char *opt, const char *value, |
48 | void *cookie); | |
49 | ||
50 | typedef int (*nfs_host_callback_t)(const char *sharepath, const char *host, | |
51 | const char *security, const char *access, void *cookie); | |
52 | ||
590338f6 GB |
53 | /** |
54 | * Invokes the specified callback function for each Solaris share option | |
55 | * listed in the specified string. | |
56 | */ | |
46e18b3f GB |
57 | static int |
58 | foreach_nfs_shareopt(const char *shareopts, | |
59 | nfs_shareopt_callback_t callback, void *cookie) | |
60 | { | |
61 | char *shareopts_dup, *opt, *cur, *value; | |
62 | int was_nul, rc; | |
63 | ||
64 | if (shareopts == NULL) | |
65 | return SA_OK; | |
66 | ||
67 | shareopts_dup = strdup(shareopts); | |
68 | ||
69 | if (shareopts_dup == NULL) | |
70 | return SA_NO_MEMORY; | |
71 | ||
72 | opt = shareopts_dup; | |
73 | was_nul = 0; | |
74 | ||
75 | while (1) { | |
76 | cur = opt; | |
77 | ||
78 | while (*cur != ',' && *cur != '\0') | |
79 | cur++; | |
80 | ||
81 | if (*cur == '\0') | |
82 | was_nul = 1; | |
83 | ||
84 | *cur = '\0'; | |
85 | ||
86 | if (cur > opt) { | |
87 | value = strchr(opt, '='); | |
88 | ||
89 | if (value != NULL) { | |
90 | *value = '\0'; | |
91 | value++; | |
92 | } | |
93 | ||
94 | rc = callback(opt, value, cookie); | |
95 | ||
96 | if (rc != SA_OK) { | |
97 | free(shareopts_dup); | |
98 | return rc; | |
99 | } | |
100 | } | |
101 | ||
102 | opt = cur + 1; | |
103 | ||
104 | if (was_nul) | |
105 | break; | |
106 | } | |
107 | ||
108 | free(shareopts_dup); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | typedef struct nfs_host_cookie_s { | |
114 | nfs_host_callback_t callback; | |
115 | const char *sharepath; | |
116 | void *cookie; | |
117 | const char *security; | |
118 | } nfs_host_cookie_t; | |
119 | ||
590338f6 GB |
120 | /** |
121 | * Helper function for foreach_nfs_host. This function checks whether the | |
122 | * current share option is a host specification and invokes a callback | |
123 | * function with information about the host. | |
124 | */ | |
46e18b3f GB |
125 | static int |
126 | foreach_nfs_host_cb(const char *opt, const char *value, void *pcookie) | |
127 | { | |
128 | int rc; | |
129 | const char *access; | |
130 | char *host_dup, *host, *next; | |
131 | nfs_host_cookie_t *udata = (nfs_host_cookie_t *)pcookie; | |
132 | ||
133 | #ifdef DEBUG | |
134 | fprintf(stderr, "foreach_nfs_host_cb: key=%s, value=%s\n", opt, value); | |
135 | #endif | |
136 | ||
137 | if (strcmp(opt, "sec") == 0) | |
138 | udata->security = value; | |
139 | ||
140 | if (strcmp(opt, "rw") == 0 || strcmp(opt, "ro") == 0) { | |
141 | if (value == NULL) | |
142 | value = "*"; | |
143 | ||
144 | access = opt; | |
145 | ||
146 | host_dup = strdup(value); | |
147 | ||
148 | if (host_dup == NULL) | |
149 | return SA_NO_MEMORY; | |
150 | ||
151 | host = host_dup; | |
152 | ||
153 | do { | |
154 | next = strchr(host, ':'); | |
155 | if (next != NULL) { | |
156 | *next = '\0'; | |
157 | next++; | |
158 | } | |
159 | ||
160 | rc = udata->callback(udata->sharepath, host, | |
161 | udata->security, access, udata->cookie); | |
162 | ||
163 | if (rc != SA_OK) { | |
164 | free(host_dup); | |
165 | ||
166 | return rc; | |
167 | } | |
168 | ||
169 | host = next; | |
170 | } while (host != NULL); | |
171 | ||
172 | free(host_dup); | |
173 | } | |
174 | ||
175 | return SA_OK; | |
176 | } | |
177 | ||
590338f6 GB |
178 | /** |
179 | * Invokes a callback function for all NFS hosts that are set for a share. | |
180 | */ | |
46e18b3f GB |
181 | static int |
182 | foreach_nfs_host(sa_share_impl_t impl_share, nfs_host_callback_t callback, | |
183 | void *cookie) | |
184 | { | |
185 | nfs_host_cookie_t udata; | |
186 | char *shareopts; | |
187 | ||
188 | udata.callback = callback; | |
189 | udata.sharepath = impl_share->sharepath; | |
190 | udata.cookie = cookie; | |
191 | udata.security = "sys"; | |
192 | ||
193 | shareopts = FSINFO(impl_share, nfs_fstype)->shareopts; | |
194 | ||
195 | return foreach_nfs_shareopt(shareopts, foreach_nfs_host_cb, | |
196 | &udata); | |
197 | } | |
198 | ||
590338f6 GB |
199 | /** |
200 | * Converts a Solaris NFS host specification to its Linux equivalent. | |
201 | */ | |
46e18b3f GB |
202 | static int |
203 | get_linux_hostspec(const char *solaris_hostspec, char **plinux_hostspec) | |
204 | { | |
205 | /* | |
206 | * For now we just support CIDR masks (e.g. @192.168.0.0/16) and host | |
207 | * wildcards (e.g. *.example.org). | |
208 | */ | |
209 | if (solaris_hostspec[0] == '@') { | |
210 | /* | |
211 | * Solaris host specifier, e.g. @192.168.0.0/16; we just need | |
212 | * to skip the @ in this case | |
213 | */ | |
214 | *plinux_hostspec = strdup(solaris_hostspec + 1); | |
215 | } else { | |
216 | *plinux_hostspec = strdup(solaris_hostspec); | |
217 | } | |
218 | ||
219 | if (*plinux_hostspec == NULL) { | |
220 | return SA_NO_MEMORY; | |
221 | } | |
222 | ||
223 | return SA_OK; | |
224 | } | |
225 | ||
590338f6 GB |
226 | /** |
227 | * Used internally by nfs_enable_share to enable sharing for a single host. | |
228 | */ | |
46e18b3f GB |
229 | static int |
230 | nfs_enable_share_one(const char *sharepath, const char *host, | |
231 | const char *security, const char *access, void *pcookie) | |
232 | { | |
ddd0fd9e | 233 | int rc; |
46e18b3f GB |
234 | char *linuxhost, *hostpath, *opts; |
235 | const char *linux_opts = (const char *)pcookie; | |
ddd0fd9e | 236 | char *argv[6]; |
46e18b3f GB |
237 | |
238 | /* exportfs -i -o sec=XX,rX,<opts> <host>:<sharepath> */ | |
239 | ||
240 | rc = get_linux_hostspec(host, &linuxhost); | |
241 | ||
242 | if (rc < 0) | |
243 | exit(1); | |
244 | ||
245 | hostpath = malloc(strlen(linuxhost) + 1 + strlen(sharepath) + 1); | |
246 | ||
247 | if (hostpath == NULL) { | |
248 | free(linuxhost); | |
249 | ||
250 | exit(1); | |
251 | } | |
252 | ||
253 | sprintf(hostpath, "%s:%s", linuxhost, sharepath); | |
254 | ||
255 | free(linuxhost); | |
256 | ||
257 | if (linux_opts == NULL) | |
258 | linux_opts = ""; | |
259 | ||
260 | opts = malloc(4 + strlen(security) + 4 + strlen(linux_opts) + 1); | |
261 | ||
262 | if (opts == NULL) | |
263 | exit(1); | |
264 | ||
265 | sprintf(opts, "sec=%s,%s,%s", security, access, linux_opts); | |
266 | ||
267 | #ifdef DEBUG | |
268 | fprintf(stderr, "sharing %s with opts %s\n", hostpath, opts); | |
269 | #endif | |
270 | ||
ddd0fd9e GB |
271 | argv[0] = "/usr/sbin/exportfs"; |
272 | argv[1] = "-i"; | |
273 | argv[2] = "-o"; | |
274 | argv[3] = opts; | |
275 | argv[4] = hostpath; | |
276 | argv[5] = NULL; | |
46e18b3f | 277 | |
ddd0fd9e | 278 | rc = libzfs_run_process(argv[0], argv, 0); |
46e18b3f | 279 | |
ddd0fd9e GB |
280 | free(hostpath); |
281 | free(opts); | |
282 | ||
283 | if (rc < 0) | |
284 | return SA_SYSTEM_ERR; | |
285 | else | |
286 | return SA_OK; | |
46e18b3f GB |
287 | } |
288 | ||
590338f6 GB |
289 | /** |
290 | * Adds a Linux share option to an array of NFS options. | |
291 | */ | |
46e18b3f GB |
292 | static int |
293 | add_linux_shareopt(char **plinux_opts, const char *key, const char *value) | |
294 | { | |
295 | size_t len = 0; | |
296 | char *new_linux_opts; | |
297 | ||
298 | if (*plinux_opts != NULL) | |
299 | len = strlen(*plinux_opts); | |
300 | ||
301 | new_linux_opts = realloc(*plinux_opts, len + 1 + strlen(key) + | |
302 | (value ? 1 + strlen(value) : 0) + 1); | |
303 | ||
304 | if (new_linux_opts == NULL) | |
305 | return SA_NO_MEMORY; | |
306 | ||
307 | new_linux_opts[len] = '\0'; | |
308 | ||
309 | if (len > 0) | |
310 | strcat(new_linux_opts, ","); | |
311 | ||
312 | strcat(new_linux_opts, key); | |
313 | ||
314 | if (value != NULL) { | |
315 | strcat(new_linux_opts, "="); | |
316 | strcat(new_linux_opts, value); | |
317 | } | |
318 | ||
319 | *plinux_opts = new_linux_opts; | |
320 | ||
321 | return SA_OK; | |
322 | } | |
323 | ||
590338f6 GB |
324 | /** |
325 | * Validates and converts a single Solaris share option to its Linux | |
326 | * equivalent. | |
327 | */ | |
46e18b3f GB |
328 | static int |
329 | get_linux_shareopts_cb(const char *key, const char *value, void *cookie) | |
330 | { | |
331 | char **plinux_opts = (char **)cookie; | |
332 | ||
333 | /* host-specific options, these are taken care of elsewhere */ | |
334 | if (strcmp(key, "ro") == 0 || strcmp(key, "rw") == 0 || | |
335 | strcmp(key, "sec") == 0) | |
336 | return SA_OK; | |
337 | ||
338 | if (strcmp(key, "anon") == 0) | |
339 | key = "anonuid"; | |
340 | ||
341 | if (strcmp(key, "root_mapping") == 0) { | |
342 | (void) add_linux_shareopt(plinux_opts, "root_squash", NULL); | |
343 | key = "anonuid"; | |
344 | } | |
345 | ||
346 | if (strcmp(key, "nosub") == 0) | |
347 | key = "subtree_check"; | |
348 | ||
349 | if (strcmp(key, "insecure") != 0 && strcmp(key, "secure") != 0 && | |
350 | strcmp(key, "async") != 0 && strcmp(key, "sync") != 0 && | |
351 | strcmp(key, "no_wdelay") != 0 && strcmp(key, "wdelay") != 0 && | |
352 | strcmp(key, "nohide") != 0 && strcmp(key, "hide") != 0 && | |
353 | strcmp(key, "crossmnt") != 0 && | |
354 | strcmp(key, "no_subtree_check") != 0 && | |
355 | strcmp(key, "subtree_check") != 0 && | |
356 | strcmp(key, "insecure_locks") != 0 && | |
357 | strcmp(key, "secure_locks") != 0 && | |
358 | strcmp(key, "no_auth_nlm") != 0 && strcmp(key, "auth_nlm") != 0 && | |
359 | strcmp(key, "no_acl") != 0 && strcmp(key, "mountpoint") != 0 && | |
360 | strcmp(key, "mp") != 0 && strcmp(key, "fsuid") != 0 && | |
361 | strcmp(key, "refer") != 0 && strcmp(key, "replicas") != 0 && | |
362 | strcmp(key, "root_squash") != 0 && | |
363 | strcmp(key, "no_root_squash") != 0 && | |
364 | strcmp(key, "all_squash") != 0 && | |
d2e032ca | 365 | strcmp(key, "no_all_squash") != 0 && strcmp(key, "fsid") != 0 && |
46e18b3f GB |
366 | strcmp(key, "anonuid") != 0 && strcmp(key, "anongid") != 0) { |
367 | return SA_SYNTAX_ERR; | |
368 | } | |
369 | ||
370 | (void) add_linux_shareopt(plinux_opts, key, value); | |
371 | ||
372 | return SA_OK; | |
373 | } | |
374 | ||
590338f6 GB |
375 | /** |
376 | * Takes a string containing Solaris share options (e.g. "sync,no_acl") and | |
377 | * converts them to a NULL-terminated array of Linux NFS options. | |
378 | */ | |
46e18b3f GB |
379 | static int |
380 | get_linux_shareopts(const char *shareopts, char **plinux_opts) | |
381 | { | |
382 | int rc; | |
383 | ||
384 | assert(plinux_opts != NULL); | |
385 | ||
386 | *plinux_opts = NULL; | |
387 | ||
388 | /* default options for Solaris shares */ | |
389 | (void) add_linux_shareopt(plinux_opts, "no_subtree_check", NULL); | |
390 | (void) add_linux_shareopt(plinux_opts, "no_root_squash", NULL); | |
391 | (void) add_linux_shareopt(plinux_opts, "mountpoint", NULL); | |
392 | ||
393 | rc = foreach_nfs_shareopt(shareopts, get_linux_shareopts_cb, plinux_opts); | |
394 | ||
395 | if (rc != SA_OK) { | |
396 | free(*plinux_opts); | |
397 | *plinux_opts = NULL; | |
398 | } | |
399 | ||
400 | return rc; | |
401 | } | |
402 | ||
590338f6 GB |
403 | /** |
404 | * Enables NFS sharing for the specified share. | |
405 | */ | |
46e18b3f GB |
406 | static int |
407 | nfs_enable_share(sa_share_impl_t impl_share) | |
408 | { | |
409 | char *shareopts, *linux_opts; | |
410 | int rc; | |
411 | ||
27ccd414 | 412 | if (!nfs_available()) { |
46e18b3f GB |
413 | return SA_SYSTEM_ERR; |
414 | } | |
415 | ||
416 | shareopts = FSINFO(impl_share, nfs_fstype)->shareopts; | |
417 | ||
418 | if (shareopts == NULL) | |
419 | return SA_OK; | |
420 | ||
421 | rc = get_linux_shareopts(shareopts, &linux_opts); | |
422 | ||
423 | if (rc != SA_OK) | |
424 | return rc; | |
425 | ||
426 | rc = foreach_nfs_host(impl_share, nfs_enable_share_one, linux_opts); | |
427 | ||
428 | free(linux_opts); | |
429 | ||
430 | return rc; | |
431 | } | |
432 | ||
590338f6 GB |
433 | /** |
434 | * Used internally by nfs_disable_share to disable sharing for a single host. | |
435 | */ | |
46e18b3f GB |
436 | static int |
437 | nfs_disable_share_one(const char *sharepath, const char *host, | |
438 | const char *security, const char *access, void *cookie) | |
439 | { | |
ddd0fd9e | 440 | int rc; |
46e18b3f | 441 | char *linuxhost, *hostpath; |
ddd0fd9e | 442 | char *argv[4]; |
46e18b3f GB |
443 | |
444 | rc = get_linux_hostspec(host, &linuxhost); | |
445 | ||
446 | if (rc < 0) | |
447 | exit(1); | |
448 | ||
449 | hostpath = malloc(strlen(linuxhost) + 1 + strlen(sharepath) + 1); | |
450 | ||
451 | if (hostpath == NULL) { | |
452 | free(linuxhost); | |
453 | exit(1); | |
454 | } | |
455 | ||
456 | sprintf(hostpath, "%s:%s", linuxhost, sharepath); | |
457 | ||
458 | free(linuxhost); | |
459 | ||
460 | #ifdef DEBUG | |
461 | fprintf(stderr, "unsharing %s\n", hostpath); | |
462 | #endif | |
463 | ||
ddd0fd9e GB |
464 | argv[0] = "/usr/sbin/exportfs"; |
465 | argv[1] = "-u"; | |
466 | argv[2] = hostpath; | |
467 | argv[3] = NULL; | |
46e18b3f | 468 | |
ddd0fd9e | 469 | rc = libzfs_run_process(argv[0], argv, 0); |
46e18b3f | 470 | |
ddd0fd9e GB |
471 | free(hostpath); |
472 | ||
473 | if (rc < 0) | |
474 | return SA_SYSTEM_ERR; | |
475 | else | |
476 | return SA_OK; | |
46e18b3f GB |
477 | } |
478 | ||
590338f6 GB |
479 | /** |
480 | * Disables NFS sharing for the specified share. | |
481 | */ | |
46e18b3f GB |
482 | static int |
483 | nfs_disable_share(sa_share_impl_t impl_share) | |
484 | { | |
27ccd414 | 485 | if (!nfs_available()) { |
46e18b3f GB |
486 | /* |
487 | * The share can't possibly be active, so nothing | |
488 | * needs to be done to disable it. | |
489 | */ | |
490 | return SA_OK; | |
491 | } | |
492 | ||
493 | return foreach_nfs_host(impl_share, nfs_disable_share_one, NULL); | |
494 | } | |
495 | ||
590338f6 GB |
496 | /** |
497 | * Checks whether the specified NFS share options are syntactically correct. | |
498 | */ | |
46e18b3f GB |
499 | static int |
500 | nfs_validate_shareopts(const char *shareopts) | |
501 | { | |
502 | char *linux_opts; | |
503 | int rc; | |
504 | ||
505 | rc = get_linux_shareopts(shareopts, &linux_opts); | |
506 | ||
507 | if (rc != SA_OK) | |
508 | return rc; | |
509 | ||
510 | free(linux_opts); | |
511 | ||
512 | return SA_OK; | |
513 | } | |
514 | ||
590338f6 GB |
515 | /** |
516 | * Checks whether a share is currently active. | |
517 | */ | |
46e18b3f GB |
518 | static boolean_t |
519 | is_share_active(sa_share_impl_t impl_share) | |
520 | { | |
46e18b3f GB |
521 | char line[512]; |
522 | char *tab, *cur; | |
5333eb0b | 523 | FILE *nfs_exportfs_temp_fp; |
46e18b3f | 524 | |
27ccd414 | 525 | if (!nfs_available()) |
46e18b3f GB |
526 | return B_FALSE; |
527 | ||
5333eb0b | 528 | nfs_exportfs_temp_fp = fdopen(dup(nfs_exportfs_temp_fd), "r"); |
46e18b3f | 529 | |
5333eb0b J |
530 | if (nfs_exportfs_temp_fp == NULL || |
531 | fseek(nfs_exportfs_temp_fp, 0, SEEK_SET) < 0) { | |
532 | fclose(nfs_exportfs_temp_fp); | |
46e18b3f | 533 | return B_FALSE; |
5333eb0b | 534 | } |
46e18b3f | 535 | |
5333eb0b J |
536 | while (fgets(line, sizeof(line), nfs_exportfs_temp_fp) != NULL) { |
537 | /* | |
538 | * exportfs uses separate lines for the share path | |
539 | * and the export options when the share path is longer | |
540 | * than a certain amount of characters; this ignores | |
541 | * the option lines | |
542 | */ | |
543 | if (line[0] == '\t') | |
544 | continue; | |
46e18b3f | 545 | |
5333eb0b | 546 | tab = strchr(line, '\t'); |
46e18b3f | 547 | |
5333eb0b J |
548 | if (tab != NULL) { |
549 | *tab = '\0'; | |
550 | cur = tab - 1; | |
551 | } else { | |
46e18b3f | 552 | /* |
5333eb0b J |
553 | * there's no tab character, which means the |
554 | * NFS options are on a separate line; we just | |
555 | * need to remove the new-line character | |
556 | * at the end of the line | |
46e18b3f | 557 | */ |
5333eb0b | 558 | cur = line + strlen(line) - 1; |
46e18b3f GB |
559 | } |
560 | ||
5333eb0b J |
561 | /* remove trailing spaces and new-line characters */ |
562 | while (cur >= line && (*cur == ' ' || *cur == '\n')) | |
563 | *cur-- = '\0'; | |
46e18b3f | 564 | |
5333eb0b J |
565 | if (strcmp(line, impl_share->sharepath) == 0) { |
566 | fclose(nfs_exportfs_temp_fp); | |
567 | return B_TRUE; | |
568 | } | |
46e18b3f GB |
569 | } |
570 | ||
5333eb0b | 571 | fclose(nfs_exportfs_temp_fp); |
46e18b3f | 572 | |
5333eb0b | 573 | return B_FALSE; |
46e18b3f GB |
574 | } |
575 | ||
590338f6 GB |
576 | /** |
577 | * Called to update a share's options. A share's options might be out of | |
578 | * date if the share was loaded from disk (i.e. /etc/dfs/sharetab) and the | |
579 | * "sharenfs" dataset property has changed in the meantime. This function | |
580 | * also takes care of re-enabling the share if necessary. | |
581 | */ | |
46e18b3f GB |
582 | static int |
583 | nfs_update_shareopts(sa_share_impl_t impl_share, const char *resource, | |
584 | const char *shareopts) | |
585 | { | |
586 | char *shareopts_dup; | |
587 | boolean_t needs_reshare = B_FALSE; | |
588 | char *old_shareopts; | |
589 | ||
590 | FSINFO(impl_share, nfs_fstype)->active = is_share_active(impl_share); | |
591 | ||
592 | old_shareopts = FSINFO(impl_share, nfs_fstype)->shareopts; | |
593 | ||
594 | if (strcmp(shareopts, "on") == 0) | |
595 | shareopts = "rw"; | |
596 | ||
597 | if (FSINFO(impl_share, nfs_fstype)->active && old_shareopts != NULL && | |
598 | strcmp(old_shareopts, shareopts) != 0) { | |
599 | needs_reshare = B_TRUE; | |
600 | nfs_disable_share(impl_share); | |
601 | } | |
602 | ||
603 | shareopts_dup = strdup(shareopts); | |
604 | ||
605 | if (shareopts_dup == NULL) | |
606 | return SA_NO_MEMORY; | |
607 | ||
608 | if (old_shareopts != NULL) | |
609 | free(old_shareopts); | |
610 | ||
611 | FSINFO(impl_share, nfs_fstype)->shareopts = shareopts_dup; | |
612 | ||
613 | if (needs_reshare) | |
614 | nfs_enable_share(impl_share); | |
615 | ||
616 | return SA_OK; | |
617 | } | |
618 | ||
590338f6 GB |
619 | /** |
620 | * Clears a share's NFS options. Used by libshare to | |
621 | * clean up shares that are about to be free()'d. | |
622 | */ | |
46e18b3f GB |
623 | static void |
624 | nfs_clear_shareopts(sa_share_impl_t impl_share) | |
625 | { | |
626 | free(FSINFO(impl_share, nfs_fstype)->shareopts); | |
627 | FSINFO(impl_share, nfs_fstype)->shareopts = NULL; | |
628 | } | |
629 | ||
630 | static const sa_share_ops_t nfs_shareops = { | |
631 | .enable_share = nfs_enable_share, | |
632 | .disable_share = nfs_disable_share, | |
633 | ||
634 | .validate_shareopts = nfs_validate_shareopts, | |
635 | .update_shareopts = nfs_update_shareopts, | |
636 | .clear_shareopts = nfs_clear_shareopts, | |
637 | }; | |
638 | ||
5333eb0b J |
639 | /* |
640 | * nfs_check_exportfs() checks that the exportfs command runs | |
641 | * and also maintains a temporary copy of the output from | |
642 | * exportfs -v. | |
643 | * To update this temporary copy simply call this function again. | |
644 | * | |
645 | * TODO : Use /var/lib/nfs/etab instead of our private copy. | |
646 | * But must implement locking to prevent concurrent access. | |
647 | * | |
648 | * TODO : The temporary file descriptor is never closed since | |
649 | * there is no libshare_nfs_fini() function. | |
650 | */ | |
46e18b3f GB |
651 | static int |
652 | nfs_check_exportfs(void) | |
653 | { | |
654 | pid_t pid; | |
5333eb0b J |
655 | int rc, status; |
656 | static char nfs_exportfs_tempfile[] = "/tmp/exportfs.XXXXXX"; | |
657 | ||
658 | /* | |
659 | * Close any existing temporary copies of output from exportfs. | |
660 | * We have already called unlink() so file will be deleted. | |
661 | */ | |
662 | if (nfs_exportfs_temp_fd >= 0) | |
663 | close(nfs_exportfs_temp_fd); | |
664 | ||
665 | nfs_exportfs_temp_fd = mkstemp(nfs_exportfs_tempfile); | |
666 | ||
667 | if (nfs_exportfs_temp_fd < 0) | |
668 | return SA_SYSTEM_ERR; | |
669 | ||
670 | unlink(nfs_exportfs_tempfile); | |
671 | ||
672 | fcntl(nfs_exportfs_temp_fd, F_SETFD, FD_CLOEXEC); | |
46e18b3f GB |
673 | |
674 | pid = fork(); | |
675 | ||
27ccd414 CP |
676 | if (pid < 0) { |
677 | (void) close(nfs_exportfs_temp_fd); | |
678 | nfs_exportfs_temp_fd = -1; | |
46e18b3f | 679 | return SA_SYSTEM_ERR; |
27ccd414 | 680 | } |
46e18b3f GB |
681 | |
682 | if (pid > 0) { | |
683 | while ((rc = waitpid(pid, &status, 0)) <= 0 && errno == EINTR) | |
684 | ; /* empty loop body */ | |
685 | ||
27ccd414 CP |
686 | if (rc <= 0) { |
687 | (void) close(nfs_exportfs_temp_fd); | |
688 | nfs_exportfs_temp_fd = -1; | |
46e18b3f | 689 | return SA_SYSTEM_ERR; |
27ccd414 | 690 | } |
46e18b3f | 691 | |
27ccd414 CP |
692 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
693 | (void) close(nfs_exportfs_temp_fd); | |
694 | nfs_exportfs_temp_fd = -1; | |
46e18b3f | 695 | return SA_CONFIG_ERR; |
27ccd414 | 696 | } |
46e18b3f GB |
697 | |
698 | return SA_OK; | |
699 | } | |
700 | ||
701 | /* child */ | |
702 | ||
5333eb0b | 703 | /* exportfs -v */ |
46e18b3f | 704 | |
5333eb0b | 705 | if (dup2(nfs_exportfs_temp_fd, STDOUT_FILENO) < 0) |
46e18b3f GB |
706 | exit(1); |
707 | ||
5333eb0b | 708 | rc = execlp("/usr/sbin/exportfs", "exportfs", "-v", NULL); |
46e18b3f GB |
709 | |
710 | if (rc < 0) { | |
711 | exit(1); | |
712 | } | |
713 | ||
714 | exit(0); | |
715 | } | |
716 | ||
27ccd414 CP |
717 | /* |
718 | * Provides a convenient wrapper for determing nfs availability | |
719 | */ | |
720 | static boolean_t | |
721 | nfs_available(void) | |
722 | { | |
723 | if (nfs_exportfs_temp_fd == -1) | |
724 | (void) nfs_check_exportfs(); | |
725 | ||
726 | return (nfs_exportfs_temp_fd != -1) ? B_TRUE : B_FALSE; | |
727 | } | |
728 | ||
590338f6 GB |
729 | /** |
730 | * Initializes the NFS functionality of libshare. | |
731 | */ | |
46e18b3f GB |
732 | void |
733 | libshare_nfs_init(void) | |
734 | { | |
46e18b3f GB |
735 | nfs_fstype = register_fstype("nfs", &nfs_shareops); |
736 | } |