2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/ioccom.h>
41 #include <sys/spinlock2.h>
42 #include <sys/fcntl.h>
43 #include <sys/device.h>
44 #include <sys/mount.h>
45 #include <vfs/devfs/devfs.h>
46 #include <vfs/devfs/devfs_rules.h>
48 MALLOC_DECLARE(M_DEVFS);
51 static int WildCmp(const char *w, const char *s);
53 static int WildCaseCmp(const char *w, const char *s);
54 static int wildCmp(const char **mary, int d, const char *w, const char *s);
55 static int wildCaseCmp(const char **mary, int d, const char *w, const char *s);
57 static d_open_t devfs_dev_open;
58 static d_close_t devfs_dev_close;
59 static d_ioctl_t devfs_dev_ioctl;
61 static struct devfs_rule *devfs_rule_alloc(struct devfs_rule *);
62 static void devfs_rule_free(struct devfs_rule *);
63 static void devfs_rule_insert(struct devfs_rule *);
64 static void devfs_rule_remove(struct devfs_rule *);
65 static void devfs_rule_clear(struct devfs_rule *);
67 static int devfs_rule_checkname(struct devfs_rule *, struct devfs_node *);
69 static struct objcache *devfs_rule_cache;
70 static struct lock devfs_rule_lock;
72 static struct objcache_malloc_args devfs_rule_malloc_args = {
73 sizeof(struct devfs_rule), M_DEVFS };
75 static cdev_t devfs_dev;
76 static struct devfs_rule_head devfs_rule_list =
77 TAILQ_HEAD_INITIALIZER(devfs_rule_list);
79 static struct dev_ops devfs_dev_ops = {
81 .d_open = devfs_dev_open,
82 .d_close = devfs_dev_close,
83 .d_ioctl = devfs_dev_ioctl
87 static struct devfs_rule *
88 devfs_rule_alloc(struct devfs_rule *templ)
90 struct devfs_rule *rule;
92 rule = objcache_get(devfs_rule_cache, M_WAITOK);
93 memset(rule, 0, sizeof(struct devfs_rule));
95 if (templ->mntpoint != NULL) {
96 rule->mntpoint = kmalloc(templ->mntpointlen+1, M_DEVFS, M_WAITOK);
97 copyin(templ->mntpoint, rule->mntpoint, templ->mntpointlen+1);
100 if (templ->name != NULL) {
101 rule->name = kmalloc(templ->namlen+1, M_DEVFS, M_WAITOK);
102 copyin(templ->name, rule->name, templ->namlen+1);
105 if (templ->linkname != NULL) {
106 rule->linkname = kmalloc(templ->linknamlen+1, M_DEVFS, M_WAITOK);
107 copyin(templ->linkname, rule->linkname, templ->linknamlen+1);
110 rule->rule_type = templ->rule_type;
111 rule->dev_type = templ->dev_type;
112 rule->mode = templ->mode;
113 rule->uid = templ->uid;
114 rule->gid = templ->gid;
121 devfs_rule_free(struct devfs_rule *rule)
123 if (rule->mntpoint != NULL) {
124 kfree(rule->mntpoint, M_DEVFS);
127 if (rule->name != NULL) {
128 kfree(rule->name, M_DEVFS);
131 if (rule->linkname != NULL) {
132 kfree(rule->linkname, M_DEVFS);
134 objcache_put(devfs_rule_cache, rule);
139 devfs_rule_insert(struct devfs_rule *templ)
141 struct devfs_rule *rule;
143 rule = devfs_rule_alloc(templ);
145 lockmgr(&devfs_rule_lock, LK_EXCLUSIVE);
146 TAILQ_INSERT_TAIL(&devfs_rule_list, rule, link);
147 lockmgr(&devfs_rule_lock, LK_RELEASE);
152 devfs_rule_remove(struct devfs_rule *rule)
154 TAILQ_REMOVE(&devfs_rule_list, rule, link);
155 devfs_rule_free(rule);
160 devfs_rule_clear(struct devfs_rule *templ)
162 struct devfs_rule *rule, *rule1, *rule2;
164 rule = devfs_rule_alloc(templ);
166 lockmgr(&devfs_rule_lock, LK_EXCLUSIVE);
167 TAILQ_FOREACH_MUTABLE(rule1, &devfs_rule_list, link, rule2) {
168 if ((rule->mntpoint[0] == '*') ||
169 ( (rule->mntpointlen == rule1->mntpointlen) &&
170 (!memcmp(rule->mntpoint, rule1->mntpoint, rule->mntpointlen)) )) {
171 devfs_rule_remove(rule1);
174 lockmgr(&devfs_rule_lock, LK_RELEASE);
175 devfs_rule_free(rule);
180 devfs_rule_reset_node(struct devfs_node *node)
183 * XXX: Don't blindly unhide all devices, some, like unix98 pty masters,
184 * haven't been hidden by a rule.
186 node->flags &= ~DEVFS_HIDDEN;
188 if ((node->node_type == Plink) && (node->flags & DEVFS_RULE_CREATED)) {
189 KKASSERT(node->link_target);
190 node->flags &= ~DEVFS_RULE_CREATED;
191 --node->link_target->nlinks;
193 } else if ((node->node_type == Pdev) && (node->d_dev)) {
194 node->uid = node->d_dev->si_uid;
195 node->gid = node->d_dev->si_gid;
196 node->mode = node->d_dev->si_perms;
204 devfs_rule_check_apply(struct devfs_node *node)
206 struct devfs_rule *rule;
207 struct mount *mp = node->mp;
211 /* Check if it is locked already. if not, we acquire the devfs lock */
212 if (!(lockstatus(&devfs_rule_lock, curthread)) == LK_EXCLUSIVE) {
213 lockmgr(&devfs_rule_lock, LK_EXCLUSIVE);
217 TAILQ_FOREACH(rule, &devfs_rule_list, link) {
220 * Skip this rule if it is only intended for jailed mount points
221 * and the current mount point isn't jailed
223 if ((rule->rule_type & DEVFS_RULE_JAIL) &&
224 (!(DEVFS_MNTDATA(mp)->jailed)) )
228 * Skip this rule if the mount point specified in the rule doesn't
229 * match the mount point of the node
231 if ((rule->mntpoint[0] != '*') &&
232 ((rule->mntpointlen != DEVFS_MNTDATA(mp)->mntonnamelen) ||
233 (memcmp(rule->mntpoint, mp->mnt_stat.f_mntonname, rule->mntpointlen))))
237 * Skip this rule if this is a by-type rule and the device flags
238 * don't match the specified device type in the rule
240 if ((rule->rule_type & DEVFS_RULE_TYPE) &&
241 ( (rule->dev_type == 0) || (!dev_is_good(node->d_dev)) ||
242 (!(dev_dflags(node->d_dev) & rule->dev_type))) )
246 * Skip this rule if this is a by-name rule and the node name
247 * doesn't match the wildcard string in the rule
249 if ((rule->rule_type & DEVFS_RULE_NAME) &&
250 (!devfs_rule_checkname(rule, node)) )
254 if (rule->rule_type & DEVFS_RULE_HIDE) {
256 * If we should hide the device, we just apply the relevant
257 * hide flag to the node and let devfs do the rest in the
260 if ((node->d_dir.d_namlen == 5) &&
261 (!memcmp(node->d_dir.d_name, "devfs", 5))) {
263 * Magically avoid /dev/devfs from being hidden, so that one
264 * can still use the rule system even after a "* hide".
268 node->flags |= DEVFS_HIDDEN;
270 } else if (rule->rule_type & DEVFS_RULE_SHOW) {
272 * Show rule just means that the node should not be hidden, so
273 * what we do is clear the hide flag from the node.
275 node->flags &= ~DEVFS_HIDDEN;
277 } else if ((rule->rule_type & DEVFS_RULE_LINK) && (node->node_type != Plink)) {
279 * This is a LINK rule, so we tell devfs to create
280 * a link with the correct name to this node.
282 devfs_alias_create(rule->linkname, node, 1);
286 * This is a normal ownership/permission rule. We
287 * just apply the permissions and ownership and
290 node->mode = rule->mode;
291 node->uid = rule->uid;
292 node->gid = rule->gid;
297 /* If we acquired the lock, we also get rid of it */
299 lockmgr(&devfs_rule_lock, LK_RELEASE);
306 devfs_rule_checkname(struct devfs_rule *rule, struct devfs_node *node)
308 struct devfs_node *parent = DEVFS_MNTDATA(node->mp)->root_node;
310 char *name, name_buf[PATH_MAX];
313 devfs_resolve_name_path(rule->name, name_buf, &path, &name);
314 parent = devfs_resolve_or_create_path(parent, path, 0);
317 return 0; /* no match */
319 /* Check if node is a child of the parent we found */
320 if (node->parent != parent)
321 return 0; /* no match */
323 if (rule->rule_type & DEVFS_RULE_LINK)
324 no_match = memcmp(name, node->d_dir.d_name, strlen(name));
326 no_match = WildCaseCmp(name, node->d_dir.d_name);
333 devfs_dev_open(struct dev_open_args *ap)
336 * Only allow read-write access.
338 if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0))
342 * We don't allow nonblocking access.
344 if ((ap->a_oflags & O_NONBLOCK) != 0) {
345 devfs_debug(DEVFS_DEBUG_SHOW, "devfs_dev: can't do nonblocking access\n");
354 devfs_dev_close(struct dev_close_args *ap)
361 devfs_dev_ioctl(struct dev_ioctl_args *ap)
364 struct devfs_rule *rule;
365 char mntpoint[PATH_MAX+1];
368 rule = (struct devfs_rule *)ap->a_data;
372 devfs_rule_insert(rule);
375 case DEVFS_RULE_APPLY:
376 copyin(rule->mntpoint, mntpoint, rule->mntpointlen);
377 devfs_apply_rules(mntpoint);
380 case DEVFS_RULE_CLEAR:
381 devfs_rule_clear(rule);
384 case DEVFS_RULE_RESET:
385 copyin(rule->mntpoint, mntpoint, rule->mntpointlen);
386 devfs_reset_rules(mntpoint);
390 error = ENOTTY; /* Inappropriate ioctl for device */
399 devfs_dev_init(void *unused)
401 lockinit(&devfs_rule_lock, "devfs_rule lock", 0, 0);
403 devfs_rule_cache = objcache_create("devfs-rule-cache", 0, 0,
405 objcache_malloc_alloc,
406 objcache_malloc_free,
407 &devfs_rule_malloc_args );
409 devfs_dev = make_dev(&devfs_dev_ops,
419 devfs_dev_uninit(void *unused)
421 /* XXX: destroy all rules first */
422 destroy_dev(devfs_dev);
423 objcache_destroy(devfs_rule_cache);
427 SYSINIT(devfsdev,SI_SUB_DRIVERS,SI_ORDER_FIRST,devfs_dev_init,NULL)
428 SYSUNINIT(devfsdev, SI_SUB_DRIVERS,SI_ORDER_FIRST,devfs_dev_uninit, NULL);
433 WildCmp(const char *w, const char *s)
437 int slen = strlen(s);
440 for (i = c = 0; w[i]; ++i) {
444 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
445 for (i = 0; i < c; ++i)
447 i = wildCmp(mary, 0, w, s);
448 kfree(mary, M_DEVFS);
455 WildCaseCmp(const char *w, const char *s)
459 int slen = strlen(s);
462 for (i = c = 0; w[i]; ++i) {
466 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
467 for (i = 0; i < c; ++i)
469 i = wildCaseCmp(mary, 0, w, s);
470 kfree(mary, M_DEVFS);
475 * WildCmp() - compare wild string to sane string
477 * Returns 0 on success, -1 on failure.
480 wildCmp(const char **mary, int d, const char *w, const char *s)
491 * optimize terminator
495 if (w[1] != '?' && w[1] != '*') {
497 * optimize * followed by non-wild
499 for (i = 0; s + i < mary[d]; ++i) {
500 if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0)
507 for (i = 0; s + i < mary[d]; ++i) {
508 if (wildCmp(mary, d + 1, w + 1, s + i) == 0)
523 if (*w == 0) /* terminator */
536 * WildCaseCmp() - compare wild string to sane string, case insensitive
538 * Returns 0 on success, -1 on failure.
541 wildCaseCmp(const char **mary, int d, const char *w, const char *s)
552 * optimize terminator
556 if (w[1] != '?' && w[1] != '*') {
558 * optimize * followed by non-wild
560 for (i = 0; s + i < mary[d]; ++i) {
561 if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
568 for (i = 0; s + i < mary[d]; ++i) {
569 if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
583 #define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x))
584 if (tolower(*w) != tolower(*s))
587 if (*w == 0) /* terminator */