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