2 * Copyright (C) 2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <sys/types.h>
24 #include <common/defaults.h>
25 #include <common/hashtable/utils.h>
26 #include <common/hashtable/hashtable.h>
27 #include <common/error.h>
29 #include <lttng/lttng-error.h>
31 #define FALLBACK_USER_BUFLEN 16384
32 #define FALLBACK_GROUP_BUFLEN 16384
34 struct lttng_tracker_list
*lttng_tracker_list_create(void)
36 struct lttng_tracker_list
*t
;
38 t
= zmalloc(sizeof(*t
));
42 t
->ht
= cds_lfht_new(DEFAULT_HT_SIZE
,
43 1, 0, CDS_LFHT_AUTO_RESIZE
| CDS_LFHT_ACCOUNTING
, NULL
);
47 CDS_INIT_LIST_HEAD(&t
->list_head
);
48 t
->state
= LTTNG_TRACK_ALL
;
57 int match_tracker_key(struct cds_lfht_node
*node
, const void *key
)
59 const struct lttng_tracker_id
*tracker_key
= key
;
60 struct lttng_tracker_list_node
*tracker_node
;
62 tracker_node
= caa_container_of(node
, struct lttng_tracker_list_node
,
64 if (tracker_node
->id
.type
!= tracker_key
->type
)
66 switch (tracker_node
->id
.type
) {
70 if (tracker_node
->id
.value
!= tracker_key
->value
)
74 if (strcmp(tracker_node
->id
.string
, tracker_key
->string
) != 0)
84 unsigned long hash_tracker_key(const struct lttng_tracker_id
*tracker_key
)
86 unsigned long key_hash
= 0;
88 switch (tracker_key
->type
) {
92 key_hash
^= hash_key_ulong((void *)(unsigned long)tracker_key
->value
,
96 key_hash
^= hash_key_str(tracker_key
->string
, lttng_ht_seed
);
98 case LTTNG_ID_UNKNOWN
:
101 key_hash
^= hash_key_ulong((void *)(unsigned long)tracker_key
->type
,
107 struct lttng_tracker_id
*lttng_tracker_list_lookup(
108 struct lttng_tracker_list
*tracker_list
,
109 const struct lttng_tracker_id
*key
)
111 struct lttng_tracker_list_node
*list_node
;
112 struct cds_lfht_iter iter
;
113 struct cds_lfht_node
*node
;
115 cds_lfht_lookup(tracker_list
->ht
,
116 hash_tracker_key(key
),
120 node
= cds_lfht_iter_get_node(&iter
);
124 list_node
= caa_container_of(node
, struct lttng_tracker_list_node
,
126 return &list_node
->id
;
130 void destroy_list_node_rcu(struct rcu_head
*head
)
132 struct lttng_tracker_list_node
*n
=
133 caa_container_of(head
, struct lttng_tracker_list_node
, rcu_head
);
140 void _lttng_tracker_list_remove(struct lttng_tracker_list
*tracker_list
,
141 struct lttng_tracker_list_node
*n
)
143 cds_list_del(&n
->list_node
);
146 cds_lfht_del(tracker_list
->ht
, &n
->ht_node
);
149 call_rcu(&n
->rcu_head
, destroy_list_node_rcu
);
153 void lttng_tracker_list_reset(struct lttng_tracker_list
*tracker_list
)
155 struct lttng_tracker_list_node
*n
, *t
;
157 cds_list_for_each_entry_safe(n
, t
, &tracker_list
->list_head
,
159 _lttng_tracker_list_remove(tracker_list
, n
);
161 tracker_list
->state
= LTTNG_TRACK_ALL
;
164 /* Protected by session mutex held by caller. */
165 int lttng_tracker_list_add(struct lttng_tracker_list
*tracker_list
,
166 const struct lttng_tracker_id
*_id
)
168 struct lttng_tracker_id
*id
;
169 struct lttng_tracker_list_node
*n
;
172 if (_id
->type
== LTTNG_ID_ALL
) {
173 /* Track all, so remove each individual item. */
174 lttng_tracker_list_reset(tracker_list
);
178 id
= lttng_tracker_list_lookup(tracker_list
, _id
);
181 return LTTNG_ERR_ID_TRACKED
;
183 n
= zmalloc(sizeof(*n
));
185 return LTTNG_ERR_NOMEM
;
188 if (_id
->type
== LTTNG_ID_STRING
) {
189 n
->id
.string
= strdup(_id
->string
);
191 ret
= LTTNG_ERR_NOMEM
;
198 cds_list_add_tail(&n
->list_node
, &tracker_list
->list_head
);
199 tracker_list
->state
= LTTNG_TRACK_LIST
;
202 cds_lfht_add(tracker_list
->ht
, hash_tracker_key(&n
->id
), &n
->ht_node
);
212 /* Lookup and remove */
213 /* Protected by session mutex held by caller. */
214 int lttng_tracker_list_remove(struct lttng_tracker_list
*tracker_list
,
215 const struct lttng_tracker_id
*_id
)
217 struct lttng_tracker_id
*id
;
218 struct lttng_tracker_list_node
*n
;
220 if (_id
->type
== LTTNG_ID_ALL
) {
222 lttng_tracker_list_reset(tracker_list
);
223 /* Set state to "track none". */
224 tracker_list
->state
= LTTNG_TRACK_NONE
;
229 id
= lttng_tracker_list_lookup(tracker_list
, _id
);
232 return LTTNG_ERR_ID_NOT_TRACKED
;
234 n
= caa_container_of(id
, struct lttng_tracker_list_node
, id
);
235 _lttng_tracker_list_remove(tracker_list
, n
);
240 void lttng_tracker_list_destroy(struct lttng_tracker_list
*tracker_list
)
244 lttng_tracker_list_reset(tracker_list
);
245 cds_lfht_destroy(tracker_list
->ht
, NULL
);
250 int lttng_lookup_user(const char *username
, int *result
)
252 struct passwd p
, *pres
;
253 int ret
, retval
= LTTNG_OK
;
257 buflen
= sysconf(_SC_GETPW_R_SIZE_MAX
);
259 buflen
= FALLBACK_USER_BUFLEN
;
261 buf
= zmalloc(buflen
);
263 retval
= LTTNG_ERR_NOMEM
;
267 ret
= getpwnam_r(username
, &p
, buf
, buflen
, &pres
);
274 buf
= zmalloc(buflen
);
276 retval
= LTTNG_ERR_NOMEM
;
289 retval
= LTTNG_ERR_USER_NOT_FOUND
;
291 *result
= (int) p
.pw_uid
;
292 DBG("Lookup of tracker UID/VUID: name '%s' maps to id %d.",
301 retval
= LTTNG_ERR_USER_NOT_FOUND
;
304 retval
= LTTNG_ERR_NOMEM
;
312 int lttng_lookup_group(const char *groupname
, int *result
)
314 struct group g
, *gres
;
315 int ret
, retval
= LTTNG_OK
;
319 buflen
= sysconf(_SC_GETGR_R_SIZE_MAX
);
321 buflen
= FALLBACK_GROUP_BUFLEN
;
323 buf
= zmalloc(buflen
);
325 retval
= LTTNG_ERR_NOMEM
;
329 ret
= getgrnam_r(groupname
, &g
, buf
, buflen
, &gres
);
336 buf
= zmalloc(buflen
);
338 retval
= LTTNG_ERR_NOMEM
;
351 retval
= LTTNG_ERR_GROUP_NOT_FOUND
;
353 *result
= (int) g
.gr_gid
;
354 DBG("Lookup of tracker GID/GUID: name '%s' maps to id %d.",
363 retval
= LTTNG_ERR_GROUP_NOT_FOUND
;
366 retval
= LTTNG_ERR_NOMEM
;
373 int lttng_tracker_id_lookup_string(enum lttng_tracker_type tracker_type
,
374 const struct lttng_tracker_id
*id
,
384 case LTTNG_ID_STRING
:
385 switch (tracker_type
) {
386 case LTTNG_TRACKER_PID
:
387 case LTTNG_TRACKER_VPID
:
388 ERR("Lookup of tracker PID/VPID by name unsupported.");
389 return LTTNG_ERR_INVALID
;
390 case LTTNG_TRACKER_UID
:
391 case LTTNG_TRACKER_VUID
:
392 DBG("Lookup of tracker UID/VUID by name.");
393 return lttng_lookup_user(id
->string
, result
);
394 case LTTNG_TRACKER_GID
:
395 case LTTNG_TRACKER_VGID
:
396 DBG("Lookup of tracker GID/VGID by name.");
397 return lttng_lookup_group(id
->string
, result
);
399 return LTTNG_ERR_INVALID
;
403 return LTTNG_ERR_INVALID
;
407 /* Protected by session mutex held by caller. */
408 /* On success, _ids and the strings it contains must be freed by caller. */
409 ssize_t
lttng_tracker_id_get_list(struct lttng_tracker_list
*tracker_list
,
410 struct lttng_tracker_id
**_ids
)
412 struct lttng_tracker_list_node
*n
;
413 ssize_t count
= 0, i
= 0, retval
= 0;
414 struct lttng_tracker_id
*ids
;
416 switch (tracker_list
->state
) {
417 case LTTNG_TRACK_LIST
:
418 cds_list_for_each_entry(n
, &tracker_list
->list_head
, list_node
) {
421 ids
= zmalloc(sizeof(*ids
) * count
);
423 PERROR("alloc list ids");
424 retval
= -LTTNG_ERR_NOMEM
;
427 cds_list_for_each_entry(n
, &tracker_list
->list_head
, list_node
) {
428 ids
[i
].type
= n
->id
.type
;
429 ids
[i
].value
= n
->id
.value
;
430 if (ids
[i
].type
== LTTNG_ID_STRING
) {
431 ids
[i
].string
= strdup(n
->id
.string
);
432 if (!ids
[i
].string
) {
433 retval
= -LTTNG_ERR_NOMEM
;
442 case LTTNG_TRACK_ALL
:
443 ids
= zmalloc(sizeof(*ids
));
445 PERROR("alloc list ids");
446 retval
= -LTTNG_ERR_NOMEM
;
449 ids
->type
= LTTNG_TRACK_ALL
;
453 case LTTNG_TRACK_NONE
:
454 /* No ids track, so we return 0 element. */
462 for (i
= 0; i
< count
; i
++) {
469 int lttng_tracker_id_set_list(struct lttng_tracker_list
*tracker_list
,
470 struct lttng_tracker_id
*_ids
,
475 lttng_tracker_list_reset(tracker_list
);
476 if (count
== 1 && _ids
[0].type
== LTTNG_ID_ALL
) {
481 /* Set state to "track none". */
482 tracker_list
->state
= LTTNG_TRACK_NONE
;
485 for (i
= 0; i
< count
; i
++) {
486 struct lttng_tracker_id
*id
= &_ids
[i
];
489 ret
= lttng_tracker_list_add(tracker_list
, id
);
490 if (ret
!= LTTNG_OK
) {