xref: /titanic_51/usr/src/cmd/devfsadm/devfsadm_impl.h (revision a799b1e741b6f59012a469e6b57c40cb8061127b)
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  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
22  * Use is subject to license terms.
23  */
24 
25 #ifndef _DEVFSADM_IMPL_H
26 #define	_DEVFSADM_IMPL_H
27 
28 #ifdef	__cplusplus
29 extern "C" {
30 #endif
31 
32 #include <dlfcn.h>
33 #include <stdarg.h>
34 #include <fcntl.h>
35 #include <sys/file.h>
36 #include <locale.h>
37 #include <libintl.h>
38 #include <ctype.h>
39 #include <signal.h>
40 #include <deflt.h>
41 #include <ftw.h>
42 #include <sys/instance.h>
43 #include <sys/types.h>
44 #include <dirent.h>
45 #include <pwd.h>
46 #include <grp.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <sys/mkdev.h>
50 #include <sys/stat.h>
51 #include <fcntl.h>
52 #include <errno.h>
53 #include <unistd.h>
54 #include <sys/stat.h>
55 #include <sys/int_types.h>
56 #include <limits.h>
57 #include <strings.h>
58 #include <devfsadm.h>
59 #include <libdevinfo.h>
60 #include <sys/devinfo_impl.h>
61 #include <sys/modctl.h>
62 #include <libgen.h>
63 #include <sys/hwconf.h>
64 #include <sys/sunddi.h>
65 #include <door.h>
66 #include <syslog.h>
67 #include <libsysevent.h>
68 #include <thread.h>
69 #include <message.h>
70 #include <sys/cladm.h>
71 #include <sys/sysevent/dev.h>
72 #include <libzonecfg.h>
73 #include <device_info.h>
74 #include <sys/fs/sdev_impl.h>
75 #include <sys/syscall.h>
76 #include <rpcsvc/ypclnt.h>
77 #include <sys/sysevent/eventdefs.h>
78 
79 #define	DEV_LOCK_FILE ".devfsadm_dev.lock"
80 #define	DAEMON_LOCK_FILE ".devfsadm_daemon.lock"
81 
82 #define	DEV "/dev"
83 #define	ETC "/etc"
84 #define	ETCDEV "/etc/dev"
85 #define	DEV_LEN 4
86 #define	DEVICES "/devices"
87 #define	DEVICES_LEN 8
88 #define	MODULE_DIRS "/usr/lib/devfsadm/linkmod"
89 #define	ALIASFILE "/etc/driver_aliases"
90 #define	NAME_TO_MAJOR "/etc/name_to_major"
91 #define	RECONFIG_BOOT "_INIT_RECONFIG"
92 #define	PID_STR_LEN 10
93 #define	EXTRA_PRIVS	"/etc/security/extra_privs"
94 #define	DEV_POLICY	"/etc/security/device_policy"
95 #define	LDEV_FILE	"/etc/logindevperm"
96 
97 #define	DEVFSADM_DEFAULT_FILE "/etc/default/devfsadm"
98 
99 #define	MINOR_FINI_TIMEOUT_DEFAULT 2
100 
101 #define	SYNCH_DOOR_PERMS	(S_IRUSR | S_IWUSR)
102 
103 #define	DRVCONFIG "drvconfig"
104 #define	DEVFSADM "devfsadm"
105 #define	DEVFSADMD "devfsadmd"
106 #define	DEVLINKS "devlinks"
107 #define	TAPES "tapes"
108 #define	AUDLINKS "audlinks"
109 #define	PORTS "ports"
110 #define	DISKS "disks"
111 
112 #define	MAX_IDLE_DELAY 5
113 #define	MAX_DELAY 30
114 #define	NAME 0x01
115 #define	ADDR 0x03
116 #define	MINOR 0x04
117 #define	COUNTER 0x05
118 #define	CONSTANT 0x06
119 #define	TYPE 0x07
120 #define	TYPE_S "type"
121 #define	ADDR_S "addr"
122 #define	ADDR_S_LEN 4
123 #define	MINOR_S "minor"
124 #define	MINOR_S_LEN 5
125 #define	NAME_S "name"
126 #define	TAB '\t'
127 #define	NEWLINE '\n'
128 #define	MAX_DEVLINK_LINE 4028
129 #define	INTEGER 0
130 #define	LETTER 1
131 #define	MAX_PERM_LINE 256
132 #define	MAX_LDEV_LINE 256
133 #define	LDEV_DELIMS " \t\n"
134 #define	LDEV_DRVLIST_DELIMS "="
135 #define	LDEV_DRV_DELIMS ", \t\n"
136 #define	LDEV_DEV_DELIM ":"
137 #define	LDEV_DRVLIST_NAME "driver"
138 #define	NFP_HASH_SZ 256
139 
140 #define	TYPE_LINK 0x00
141 #define	TYPE_DEVICES 0x01
142 
143 #define	CREATE_LINK 0x01
144 #define	READ_LINK 0x02
145 #define	CREATE_NODE 0x01
146 #define	READ_NODE 0x02
147 
148 #define	CACHE_STATE 0x0
149 #define	SYNC_STATE 0x1
150 
151 #define	MODULE_ACTIVE 0x01
152 
153 /* Possible flag values for flag member of numeral_t */
154 #define	NUMERAL_RESERVED 0x01
155 
156 #define	MAX_SLEEP 120
157 
158 #define	DEVLINKTAB_FILE "/etc/devlink.tab"
159 
160 #define	MODULE_SUFFIX ".so"
161 #define	MINOR_INIT "minor_init"
162 #define	MINOR_FINI "minor_fini"
163 #define	_DEVFSADM_CREATE_REG "_devfsadm_create_reg"
164 #define	_DEVFSADM_REMOVE_REG "_devfsadm_remove_reg"
165 
166 #define	NUM_EV_STR		4
167 #define	EV_TYPE			0
168 #define	EV_CLASS		1
169 #define	EV_PATH_NAME		2
170 #define	EV_MINOR_NAME		3
171 
172 /* add new debug level and meanings here */
173 #define	DEVLINK_MID		"devfsadm:devlink"
174 #define	MODLOAD_MID		"devfsadm:modload"
175 #define	INITFINI_MID		"devfsadm:initfini"
176 #define	EVENT_MID		"devfsadm:event"
177 #define	REMOVE_MID		"devfsadm:remove"
178 #define	LOCK_MID		"devfsadm:lock"
179 #define	PATH2INST_MID		"devfsadm:path2inst"
180 #define	CACHE_MID		"devfsadm:cache"
181 #define	BUILDCACHE_MID		"devfsadm:buildcache"
182 #define	RECURSEDEV_MID		"devfsadm:recursedev"
183 #define	INSTSYNC_MID		"devfsadm:instsync"
184 #define	FILES_MID		"devfsadm:files"
185 #define	ENUM_MID		"devfsadm:enum"
186 #define	RSRV_MID		"devfsadm:rsrv"	/* enum interface reserve  */
187 #define	RSBY_MID		"devfsadm:rsby"	/* enum reserve bypass */
188 #define	LINKCACHE_MID		"devfsadm:linkcache"
189 #define	ADDREMCACHE_MID		"devfsadm:addremcache"
190 #define	MALLOC_MID		"devfsadm:malloc"
191 #define	READDIR_MID		"devfsadm:readdir"
192 #define	READDIR_ALL_MID		"devfsadm:readdir_all"
193 #define	DEVNAME_MID		"devfsadm:devname"
194 #define	ALL_MID			"all"
195 
196 #define	DEVFSADM_DEBUG_ON	(verbose == NULL) ? FALSE : TRUE
197 
198 typedef struct recurse_dev {
199 	void (*fcn)(char *, void *);
200 	void *data;
201 } recurse_dev_t;
202 
203 typedef struct link {
204 	char *devlink; /* without ".../dev/"   prefix */
205 	char *contents; /* without "../devices" prefix */
206 	struct link *next;
207 } link_t;
208 
209 typedef struct linkhead {
210 	regex_t dir_re_compiled;
211 	char *dir_re;
212 	link_t *link;
213 	link_t *nextlink;
214 	struct linkhead *nexthead;
215 } linkhead_t;
216 
217 typedef struct link_list  {
218 	int type;
219 	char *constant;
220 	int arg;
221 	struct link_list *next;
222 } link_list_t;
223 
224 typedef struct selector_list {
225 	int key;
226 	char *val;
227 	int arg;
228 	struct selector_list *next;
229 } selector_list_t;
230 
231 typedef struct devlinktab_list {
232 	int line_number;
233 	char *selector_pattern;
234 	char *p_link_pattern;
235 	char *s_link_pattern;
236 	selector_list_t *selector;
237 	link_list_t *p_link;
238 	link_list_t *s_link;
239 	struct devlinktab_list *next;
240 } devlinktab_list_t;
241 
242 typedef struct module {
243 	char *name;
244 	void *dlhandle;
245 	int (*minor_init)();
246 	int (*minor_fini)();
247 	int flags;
248 	struct module *next;
249 } module_t;
250 
251 typedef struct create_list {
252 	devfsadm_create_t *create;
253 	module_t *modptr;
254 	regex_t node_type_comp;
255 	regex_t drv_name_comp;
256 	struct create_list *next;
257 } create_list_t;
258 
259 struct minor {
260 	di_node_t node;
261 	di_minor_t minor;
262 	struct minor *next;
263 };
264 
265 struct mlist {
266 	struct minor *head;
267 	struct minor *tail;
268 };
269 
270 typedef struct remove_list {
271 	devfsadm_remove_V1_t *remove;
272 	module_t *modptr;
273 	struct remove_list *next;
274 } remove_list_t;
275 
276 typedef struct item {
277 	char *i_key;
278 	struct item *i_next;
279 } item_t;
280 
281 typedef struct cleanup_data {
282 	int flags;
283 	char *phypath;
284 	remove_list_t *rm;
285 } cleanup_data_t;
286 
287 typedef struct n2m {
288 	major_t major;
289 	char *driver;
290 	struct n2m *next;
291 } n2m_t;
292 
293 /* structures for devfsadm_enumerate() */
294 typedef struct numeral {
295 	char *id;
296 	char *full_path;
297 	int rule_index;
298 	char *cmp_str;
299 	struct numeral *next;
300 	int flags;
301 } numeral_t;
302 
303 typedef struct numeral_set {
304 	int re_count;
305 	char **re;
306 	numeral_t *headnumeral;
307 	struct numeral_set *next;
308 } numeral_set_t;
309 
310 typedef struct temp {
311 	int integer;
312 	struct temp *next;
313 } temp_t;
314 
315 typedef struct driver_alias {
316 	char *driver_name;
317 	char *alias_name;
318 	struct driver_alias *next;
319 } driver_alias_t;
320 
321 struct driver_list {
322 	char driver_name[MAXNAMELEN];
323 	struct driver_list *next;
324 };
325 
326 struct login_dev {
327 	char *ldev_console;
328 	int ldev_perms;
329 	char *ldev_device;
330 	regex_t ldev_device_regex;
331 	struct driver_list *ldev_driver_list;
332 	struct login_dev *ldev_next;
333 };
334 
335 #define	MAX_DEV_NAME_COUNT	100
336 struct devlink_cb_arg {
337 	char *dev_names[MAX_DEV_NAME_COUNT];
338 	char *link_contents[MAX_DEV_NAME_COUNT];
339 	int count;
340 	int rv;
341 };
342 
343 struct dca_impl {
344 	char *dci_root;
345 	char *dci_minor;
346 	char *dci_driver;
347 	void *dci_arg;
348 	int dci_error;
349 	int dci_flags;
350 };
351 
352 /* sysevent queue related */
353 typedef struct syseventq_s {
354 	struct syseventq_s *next;
355 	char *class;
356 	char *subclass;
357 	nvlist_t *nvl;
358 } syseventq_t;
359 
360 static int devfsadm_enumerate_int_start(char *devfs_path,
361 	int index, char **buf, devfsadm_enumerate_t rules[],
362 	int nrules, char *start);
363 static void set_root_devices_dev_dir(char *dir);
364 static void pre_and_post_cleanup(int flags);
365 static void hot_cleanup(char *, char *, char *, char *, int);
366 static void devfsadm_exit(int status);
367 static void rm_link_from_cache(char *devlink);
368 static void rm_all_links_from_cache();
369 static void add_link_to_cache(char *devlink, char *physpath);
370 static linkhead_t *get_cached_links(char *dir_re);
371 static void build_devlink_list(char *check_link, void *data);
372 static void instance_flush_thread(void);
373 static int s_rmdir(char *path);
374 static void rm_parent_dir_if_empty(char *path);
375 static void free_link_list(link_list_t *head);
376 static void free_selector_list(selector_list_t *head);
377 void devfsadm_err_print(char *message, ...);
378 void defvsadm_print(int level, char *message, ...);
379 static int call_minor_init(module_t *module);
380 static void load_module(char *module, char *cdir);
381 static void invalidate_enumerate_cache(void);
382 static pid_t enter_dev_lock(void);
383 static void exit_dev_lock(int exiting);
384 static pid_t enter_daemon_lock(void);
385 static void exit_daemon_lock(int exiting);
386 static int process_devlink_compat(di_minor_t minor, di_node_t node);
387 static int alias(char *, char *);
388 static int devfsadm_copy(void);
389 static void flush_path_to_inst(void);
390 static void detachfromtty(void);
391 static void minor_process(di_node_t node, di_minor_t minor,
392     struct mlist *dep);
393 static void read_minor_perm_file(void);
394 static void read_driver_aliases_file(void);
395 static void load_modules(void);
396 static void unload_modules(void);
397 static void *s_malloc(const size_t size);
398 static void *s_zalloc(const size_t size);
399 static void devfs_instance_mod(void);
400 static void add_minor_pathname(char *, char *, char *);
401 static int check_minor_type(di_node_t node, di_minor_t minor, void *arg);
402 static void cache_deferred_minor(struct mlist *dep, di_node_t node,
403     di_minor_t minor);
404 static int compare_field(char *full_name, char *field_item, int field);
405 static int component_cat(char *link, char *name, int field);
406 static void recurse_dev_re(char *current_dir, char *path_re, recurse_dev_t *rd);
407 static void matching_dev(char *devpath, void *data);
408 static int resolve_link(char *devpath, char **content_p, int *type_p,
409     char **devfs_path, int dangle);
410 static int clean_ok(devfsadm_remove_V1_t *remove);
411 static int translate_major(dev_t old_dev, dev_t *new_dev);
412 static int get_major_no(char *driver, major_t *major);
413 static int load_n2m_table(char *filename);
414 static int get_stat_info(char *, struct stat *);
415 static char *new_id(numeral_t *, int, char *);
416 static int find_enum_id(devfsadm_enumerate_t rules[], int nrules,
417     char *devfs_path, int index, char *min, int type, char **buf, int multiple);
418 static void daemon_update(void);
419 static void usage(void);
420 static int getnexttoken(char *next, char **nextp, char **tokenpp, char *tchar);
421 static int class_ok(char *class);
422 static int create_link_common(char *devlink, char *contents, int *exists);
423 static char *dequote(char *src);
424 static void parse_args(int argc, char *argv[]);
425 static void process_devinfo_tree(void);
426 static void minor_fini_thread(void *arg);
427 static void *s_realloc(void *ptr, const size_t size);
428 static void read_devlinktab_file(void);
429 static selector_list_t *create_selector_list(char *selector);
430 static int parse_selector(char **selector, char **key, char **val);
431 int devfsadm_noupdate(void);
432 const char *devfsadm_root_path(void);
433 static link_list_t *create_link_list(char *link);
434 static void s_unlink(const char *file);
435 static void s_closedir(DIR *dirp);
436 static void s_mkdirp(const char *path, const mode_t mode);
437 static int is_minor_node(char *contents, char **mn_root);
438 static int construct_devlink(char *link, link_list_t *link_build,
439 				char *contents, di_minor_t minor,
440 				di_node_t node, char *pattern);
441 static int split_devlinktab_entry(char *entry, char **selector, char **p_link,
442 	    char **s_link);
443 static int devlink_matches(devlinktab_list_t *entry, di_minor_t minor,
444 			    di_node_t node);
445 static int build_links(devlinktab_list_t *entry, di_minor_t minor,
446 			di_node_t node);
447 static numeral_set_t *get_enum_cache(devfsadm_enumerate_t rules[],
448 				    int nrules);
449 static void enumerate_recurse(char *current_dir, char *path_left,
450     numeral_set_t *setp, devfsadm_enumerate_t rules[], int index);
451 
452 static int match_path_component(char *file_re, char *file, char **id,
453 				int subexp);
454 static void create_cached_numeral(char *path, numeral_set_t *setp,
455     char *numeral_id, devfsadm_enumerate_t rules[], int index);
456 static int devfsadm_copy_file(const char *file, const struct stat *stat,
457 			    int flags, struct FTW *ftw);
458 static void getattr(char *devname, char *aminor, int spectype, dev_t dev,
459     mode_t *mode, uid_t *uid, gid_t *gid);
460 static int minor_matches_rule(di_node_t node, di_minor_t minor,
461 				create_list_t *create);
462 static void add_verbose_id(char *mid);
463 static char *get_component(char *str, const char *comp_num);
464 static char *alloc_cmp_str(const char *devfs_path, devfsadm_enumerate_t *dep);
465 static int lookup_enum_cache(numeral_set_t *set, char *cmp_str,
466     devfsadm_enumerate_t rules[], int index, numeral_t **matchnpp);
467 static void sync_handler(void *cookie, char *ap, size_t asize,
468     door_desc_t *dp, uint_t ndesc);
469 static int zone_pathcheck(char *checkpath);
470 static void process_deferred_links(struct dca_impl *dcip, int flag);
471 static void event_handler(sysevent_t *ev);
472 static void dca_impl_init(char *root, char *minor, struct dca_impl *dcip);
473 static void lock_dev(void);
474 static void unlock_dev(int flag);
475 static int devlink_cb(di_devlink_t dl, void *arg);
476 static void free_dev_names(struct devlink_cb_arg *x);
477 
478 int load_devpolicy(void);
479 static void load_dev_acl(void);
480 static void load_minor_perm_file(void);
481 
482 static nvlist_t *build_event_attributes(char *, char *, char *,
483     di_node_t, char *, int, char *);
484 static void log_event(char *, char *, nvlist_t *);
485 static void build_and_enq_event(char *, char *, char *, di_node_t, char *);
486 
487 static void read_logindevperm_file(void);
488 static void set_logindev_perms(char *devlink);
489 
490 static void reset_node_permissions(di_node_t, di_minor_t);
491 
492 /*
493  * devname related
494  */
495 static void devname_lookup_handler(void *, char *, size_t,
496     door_desc_t *, uint_t);		/* /dev name lookup server */
497 static int devname_kcall(int, void *);	/* syscall into the devname fs */
498 
499 static void nfphash_create(void);
500 static int nfphash_fcn(char *key);
501 static item_t *nfphash_lookup(char *key);
502 static void nfphash_insert(char *key);
503 static void nfphash_destroy(void);
504 
505 /* Enumerate reserve related */
506 static void read_enumerate_file(void);
507 static int enumerate_parse(char *rsvstr, char *path_left, numeral_set_t *setp,
508     devfsadm_enumerate_t rules[], int index);
509 static void create_reserved_numeral(numeral_set_t *setp, char *numeral_id);
510 
511 /* convenient short hands */
512 #define	vprint		devfsadm_print
513 #define	err_print	devfsadm_errprint
514 #ifndef TRUE
515 #define	TRUE	1
516 #endif
517 #ifndef FALSE
518 #define	FALSE	0
519 #endif
520 
521 #ifdef	__cplusplus
522 }
523 #endif
524 
525 #endif /* _DEVFSADM_IMPL_H */
526