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d67281a7 UD |
1 | /* Copyright (c) 1998 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <grp.h> | |
d67281a7 | 22 | #include <pthread.h> |
da2d1bc5 | 23 | #include <stdlib.h> |
d67281a7 | 24 | #include <string.h> |
ba9234d9 | 25 | #include <unistd.h> |
d67281a7 UD |
26 | #include <rpcsvc/nis.h> |
27 | #include <sys/types.h> | |
28 | ||
29 | #include "dbg_log.h" | |
30 | #include "nscd.h" | |
31 | ||
32 | static unsigned long modulo = 211; | |
33 | static unsigned long postimeout = 3600; | |
34 | static unsigned long negtimeout = 60; | |
35 | ||
36 | static unsigned long poshit = 0; | |
37 | static unsigned long posmiss = 0; | |
38 | static unsigned long neghit = 0; | |
39 | static unsigned long negmiss = 0; | |
40 | ||
41 | struct grphash | |
42 | { | |
43 | time_t create; | |
44 | struct grphash *next; | |
45 | struct group *grp; | |
46 | }; | |
47 | typedef struct grphash grphash; | |
48 | ||
49 | struct gidhash | |
50 | { | |
51 | struct gidhash *next; | |
ba9234d9 | 52 | struct group *grptr; |
d67281a7 UD |
53 | }; |
54 | typedef struct gidhash gidhash; | |
55 | ||
56 | struct neghash | |
57 | { | |
58 | time_t create; | |
59 | struct neghash *next; | |
60 | char *key; | |
61 | }; | |
62 | typedef struct neghash neghash; | |
63 | ||
64 | static grphash *grptbl; | |
65 | static gidhash *gidtbl; | |
66 | static neghash *negtbl; | |
67 | ||
68 | static pthread_rwlock_t grplock = PTHREAD_RWLOCK_INITIALIZER; | |
69 | static pthread_rwlock_t neglock = PTHREAD_RWLOCK_INITIALIZER; | |
70 | ||
71 | static void *grptable_update (void *); | |
72 | static void *negtable_update (void *); | |
73 | ||
74 | void | |
75 | get_gr_stat (stat_response_header *stat) | |
76 | { | |
77 | stat->gr_poshit = poshit; | |
78 | stat->gr_posmiss = posmiss; | |
79 | stat->gr_neghit = neghit; | |
80 | stat->gr_negmiss = negmiss; | |
81 | stat->gr_size = modulo; | |
82 | stat->gr_posttl = postimeout; | |
83 | stat->gr_negttl = negtimeout; | |
84 | } | |
85 | ||
86 | void | |
87 | set_grp_modulo (unsigned long mod) | |
88 | { | |
89 | modulo = mod; | |
90 | } | |
91 | ||
92 | void | |
93 | set_pos_grp_ttl (unsigned long ttl) | |
94 | { | |
95 | postimeout = ttl; | |
96 | } | |
97 | ||
98 | void | |
99 | set_neg_grp_ttl (unsigned long ttl) | |
100 | { | |
101 | negtimeout = ttl; | |
102 | } | |
103 | ||
104 | int | |
105 | cache_grpinit () | |
106 | { | |
107 | pthread_attr_t attr; | |
108 | pthread_t thread; | |
109 | ||
4d06461a | 110 | grptbl = calloc (modulo, sizeof (grphash)); |
d67281a7 UD |
111 | if (grptbl == NULL) |
112 | return -1; | |
14e9dd67 | 113 | gidtbl = calloc (modulo, sizeof (grphash)); |
d67281a7 UD |
114 | if (gidtbl == NULL) |
115 | return -1; | |
4d06461a | 116 | negtbl = calloc (modulo, sizeof (neghash)); |
d67281a7 UD |
117 | if (negtbl == NULL) |
118 | return -1; | |
119 | ||
120 | pthread_attr_init (&attr); | |
121 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); | |
122 | ||
123 | pthread_create (&thread, NULL, grptable_update, &attr); | |
124 | pthread_create (&thread, NULL, negtable_update, &attr); | |
125 | ||
126 | pthread_attr_destroy (&attr); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static struct group * | |
132 | save_grp (struct group *src) | |
133 | { | |
134 | struct group *dest; | |
135 | unsigned long int l; | |
136 | ||
137 | dest = calloc (1, sizeof (struct group)); | |
138 | dest->gr_name = strdup (src->gr_name); | |
139 | dest->gr_passwd = strdup (src->gr_passwd); | |
140 | dest->gr_gid = src->gr_gid; | |
141 | ||
142 | /* How many members does this group have? */ | |
143 | l = 0; | |
144 | while (src->gr_mem[l]) | |
145 | ++l; | |
146 | ||
147 | dest->gr_mem = calloc (1, sizeof (char *) * (l+1)); | |
148 | l = 0; | |
149 | while (src->gr_mem[l]) | |
150 | { | |
151 | dest->gr_mem[l] = strdup (src->gr_mem[l]); | |
152 | ++l; | |
153 | } | |
154 | ||
155 | return dest; | |
156 | } | |
157 | ||
158 | static void | |
159 | free_grp (struct group *src) | |
160 | { | |
161 | unsigned long int l; | |
162 | ||
163 | free (src->gr_name); | |
164 | free (src->gr_passwd); | |
165 | ||
166 | l = 0; | |
167 | while (src->gr_mem[l]) | |
168 | { | |
169 | free (src->gr_mem[l]); | |
170 | ++l; | |
171 | } | |
172 | free (src->gr_mem); | |
173 | free (src); | |
174 | } | |
175 | ||
176 | static int | |
177 | add_cache (struct group *grp) | |
178 | { | |
179 | grphash *work; | |
ba9234d9 | 180 | gidhash *gidwork; |
d67281a7 UD |
181 | unsigned long int hash = __nis_hash (grp->gr_name, |
182 | strlen (grp->gr_name)) % modulo; | |
183 | ||
14e9dd67 UD |
184 | if (debug_flag) |
185 | dbg_log (_("grp_add_cache (%s)"), grp->gr_name); | |
186 | ||
d67281a7 UD |
187 | work = &grptbl[hash]; |
188 | ||
189 | if (grptbl[hash].grp == NULL) | |
190 | grptbl[hash].grp = save_grp (grp); | |
191 | else | |
192 | { | |
193 | while (work->next != NULL) | |
194 | work = work->next; | |
195 | ||
196 | work->next = calloc (1, sizeof (grphash)); | |
197 | work->next->grp = save_grp (grp); | |
198 | work = work->next; | |
199 | } | |
200 | ||
201 | time (&work->create); | |
ba9234d9 UD |
202 | gidwork = &gidtbl[grp->gr_gid % modulo]; |
203 | if (gidwork->grptr == NULL) | |
204 | gidwork->grptr = work->grp; | |
205 | else | |
206 | { | |
207 | while (gidwork->next != NULL) | |
208 | gidwork = gidwork->next; | |
209 | ||
210 | gidwork->next = calloc (1, sizeof (gidhash)); | |
211 | gidwork->next->grptr = work->grp; | |
212 | } | |
d67281a7 UD |
213 | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static struct group * | |
218 | cache_search_name (const char *name) | |
219 | { | |
220 | grphash *work; | |
221 | unsigned long int hash = __nis_hash (name, strlen(name)) % modulo; | |
222 | ||
223 | work = &grptbl[hash]; | |
224 | ||
225 | while (work->grp != NULL) | |
226 | { | |
227 | if (strcmp (work->grp->gr_name, name) == 0) | |
228 | return work->grp; | |
229 | if (work->next != NULL) | |
230 | work = work->next; | |
231 | else | |
232 | return NULL; | |
233 | } | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | static struct group * | |
238 | cache_search_gid (gid_t gid) | |
239 | { | |
240 | gidhash *work; | |
241 | ||
242 | work = &gidtbl[gid % modulo]; | |
243 | ||
244 | while (work->grptr != NULL) | |
245 | { | |
ba9234d9 UD |
246 | if (work->grptr->gr_gid == gid) |
247 | return work->grptr; | |
d67281a7 UD |
248 | if (work->next != NULL) |
249 | work = work->next; | |
250 | else | |
251 | return NULL; | |
252 | } | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | static int | |
257 | add_negcache (char *key) | |
258 | { | |
259 | neghash *work; | |
260 | unsigned long int hash = __nis_hash (key, strlen (key)) % modulo; | |
261 | ||
14e9dd67 UD |
262 | if (debug_flag) |
263 | dbg_log (_("grp_add_netgache (%s|%ld)"), key, hash); | |
264 | ||
d67281a7 UD |
265 | work = &negtbl[hash]; |
266 | ||
267 | if (negtbl[hash].key == NULL) | |
14e9dd67 UD |
268 | { |
269 | negtbl[hash].key = strdup (key); | |
270 | negtbl[hash].next = NULL; | |
271 | } | |
d67281a7 UD |
272 | else |
273 | { | |
274 | while (work->next != NULL) | |
275 | work = work->next; | |
276 | ||
277 | work->next = calloc (1, sizeof (neghash)); | |
278 | work->next->key = strdup (key); | |
279 | work = work->next; | |
280 | } | |
281 | ||
282 | time (&work->create); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int | |
287 | cache_search_neg (const char *key) | |
288 | { | |
289 | neghash *work; | |
290 | unsigned long int hash = __nis_hash (key, strlen (key)) % modulo; | |
291 | ||
14e9dd67 UD |
292 | if (debug_flag) |
293 | dbg_log (_("grp_cache_search_neg (%s|%ld)"), key, hash); | |
294 | ||
d67281a7 UD |
295 | work = &negtbl[hash]; |
296 | ||
297 | while (work->key != NULL) | |
298 | { | |
299 | if (strcmp (work->key, key) == 0) | |
300 | return 1; | |
301 | if (work->next != NULL) | |
302 | work = work->next; | |
303 | else | |
304 | return 0; | |
305 | } | |
306 | return 0; | |
307 | } | |
308 | ||
309 | void * | |
310 | cache_getgrnam (void *v_param) | |
311 | { | |
312 | param_t *param = (param_t *)v_param; | |
14e9dd67 | 313 | struct group *grp; |
d67281a7 UD |
314 | |
315 | pthread_rwlock_rdlock (&grplock); | |
316 | grp = cache_search_name (param->key); | |
317 | ||
318 | /* I don't like it to hold the read only lock longer, but it is | |
319 | necessary to avoid to much malloc/free/strcpy. */ | |
320 | ||
14e9dd67 | 321 | if (grp != NULL) |
d67281a7 UD |
322 | { |
323 | if (debug_flag) | |
324 | dbg_log (_("Found \"%s\" in cache !"), param->key); | |
325 | ||
326 | ++poshit; | |
327 | gr_send_answer (param->conn, grp); | |
328 | close_socket (param->conn); | |
329 | ||
330 | pthread_rwlock_unlock (&grplock); | |
331 | } | |
332 | else | |
333 | { | |
14e9dd67 | 334 | int status; |
d67281a7 UD |
335 | int buflen = 1024; |
336 | char *buffer = calloc (1, buflen); | |
14e9dd67 | 337 | struct group resultbuf; |
d67281a7 UD |
338 | |
339 | if (debug_flag) | |
340 | dbg_log (_("Doesn't found \"%s\" in cache !"), param->key); | |
341 | ||
342 | pthread_rwlock_unlock (&grplock); | |
343 | ||
344 | pthread_rwlock_rdlock (&neglock); | |
345 | status = cache_search_neg (param->key); | |
346 | pthread_rwlock_unlock (&neglock); | |
347 | ||
348 | if (status == 0) | |
349 | { | |
350 | while (buffer != NULL | |
351 | && (getgrnam_r (param->key, &resultbuf, buffer, buflen, &grp) | |
352 | != 0) | |
353 | && errno == ERANGE) | |
354 | { | |
355 | errno = 0; | |
356 | buflen += 1024; | |
357 | buffer = realloc (buffer, buflen); | |
358 | } | |
359 | ||
360 | if (buffer != NULL && grp != NULL) | |
361 | { | |
362 | struct group *tmp; | |
363 | ||
364 | ++poshit; | |
365 | pthread_rwlock_wrlock (&grplock); | |
366 | /* While we are waiting on the lock, somebody else could | |
367 | add this entry. */ | |
368 | tmp = cache_search_name (param->key); | |
369 | if (tmp == NULL) | |
370 | add_cache (grp); | |
371 | pthread_rwlock_unlock (&grplock); | |
372 | } | |
373 | else | |
374 | { | |
375 | pthread_rwlock_wrlock (&neglock); | |
376 | add_negcache (param->key); | |
377 | ++negmiss; | |
378 | pthread_rwlock_unlock (&neglock); | |
379 | } | |
380 | } | |
381 | else | |
382 | ++neghit; | |
383 | ||
384 | gr_send_answer (param->conn, grp); | |
385 | close_socket (param->conn); | |
386 | if (buffer != NULL) | |
387 | free (buffer); | |
388 | } | |
389 | free (param->key); | |
390 | free (param); | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | void * | |
395 | cache_gr_disabled (void *v_param) | |
396 | { | |
397 | param_t *param = (param_t *)v_param; | |
398 | ||
14e9dd67 UD |
399 | if (debug_flag) |
400 | dbg_log (_("\tgroup cache is disabled\n")); | |
401 | ||
d67281a7 UD |
402 | gr_send_disabled (param->conn); |
403 | return NULL; | |
404 | } | |
405 | ||
406 | void * | |
407 | cache_getgrgid (void *v_param) | |
408 | { | |
409 | param_t *param = (param_t *)v_param; | |
410 | struct group *grp, resultbuf; | |
411 | gid_t gid = strtol (param->key, NULL, 10); | |
412 | ||
413 | pthread_rwlock_rdlock (&grplock); | |
414 | grp = cache_search_gid (gid); | |
415 | ||
416 | /* I don't like it to hold the read only lock longer, but it is | |
417 | necessary to avoid to much malloc/free/strcpy. */ | |
418 | ||
419 | if (grp != NULL) | |
420 | { | |
421 | if (debug_flag) | |
ac16e905 | 422 | dbg_log (_("Found \"%d\" in cache !"), gid); |
d67281a7 UD |
423 | |
424 | ++poshit; | |
425 | gr_send_answer (param->conn, grp); | |
426 | close_socket (param->conn); | |
427 | ||
428 | pthread_rwlock_unlock (&grplock); | |
429 | } | |
430 | else | |
431 | { | |
432 | int buflen = 1024; | |
433 | char *buffer = malloc (buflen); | |
434 | int status; | |
435 | ||
436 | if (debug_flag) | |
ac16e905 | 437 | dbg_log (_("Doesn't found \"%d\" in cache !"), gid); |
d67281a7 UD |
438 | |
439 | pthread_rwlock_unlock (&grplock); | |
440 | ||
441 | pthread_rwlock_rdlock (&neglock); | |
442 | status = cache_search_neg (param->key); | |
443 | pthread_rwlock_unlock (&neglock); | |
444 | ||
445 | if (status == 0) | |
446 | { | |
447 | while (buffer != NULL | |
448 | && (getgrgid_r (gid, &resultbuf, buffer, buflen, &grp) != 0) | |
449 | && errno == ERANGE) | |
450 | { | |
451 | errno = 0; | |
452 | buflen += 1024; | |
453 | buffer = realloc (buffer, buflen); | |
454 | } | |
455 | ||
456 | if (buffer != NULL && grp != NULL) | |
457 | { | |
458 | struct group *tmp; | |
459 | ||
460 | ++posmiss; | |
461 | pthread_rwlock_wrlock (&grplock); | |
462 | /* While we are waiting on the lock, somebody else could | |
463 | add this entry. */ | |
464 | tmp = cache_search_gid (gid); | |
465 | if (tmp == NULL) | |
466 | add_cache (grp); | |
467 | pthread_rwlock_unlock (&grplock); | |
468 | } | |
469 | else | |
470 | { | |
471 | ++negmiss; | |
472 | pthread_rwlock_wrlock (&neglock); | |
473 | add_negcache (param->key); | |
474 | pthread_rwlock_unlock (&neglock); | |
475 | } | |
476 | } | |
477 | else | |
478 | ++neghit; | |
479 | ||
480 | gr_send_answer (param->conn, grp); | |
481 | close_socket (param->conn); | |
482 | if (buffer != NULL) | |
483 | free (buffer); | |
484 | } | |
485 | free (param->key); | |
486 | free (param); | |
487 | return NULL; | |
488 | } | |
489 | ||
ba9234d9 | 490 | static void * |
d67281a7 UD |
491 | grptable_update (void *v) |
492 | { | |
493 | time_t now; | |
494 | int i; | |
495 | ||
496 | sleep (20); | |
497 | ||
498 | while (!do_shutdown) | |
499 | { | |
500 | if (debug_flag > 2) | |
501 | dbg_log (_("(grptable_update) Wait for write lock!")); | |
502 | ||
503 | pthread_rwlock_wrlock (&grplock); | |
504 | ||
505 | if (debug_flag > 2) | |
506 | dbg_log (_("(grptable_update) Have write lock")); | |
507 | ||
508 | time (&now); | |
509 | for (i = 0; i < modulo; ++i) | |
510 | { | |
511 | grphash *work = &grptbl[i]; | |
512 | ||
513 | while (work && work->grp) | |
514 | { | |
515 | if ((now - work->create) >= postimeout) | |
516 | { | |
517 | gidhash *uh = &gidtbl[work->grp->gr_gid % modulo]; | |
518 | ||
519 | if (debug_flag) | |
520 | dbg_log (_("Give \"%s\" free"), work->grp->gr_name); | |
521 | ||
522 | while (uh && uh->grptr) | |
523 | { | |
ba9234d9 | 524 | if (uh->grptr->gr_gid == work->grp->gr_gid) |
d67281a7 UD |
525 | { |
526 | if (debug_flag > 3) | |
527 | dbg_log (_("Give gid for \"%s\" free"), | |
528 | work->grp->gr_name); | |
529 | if (uh->next != NULL) | |
530 | { | |
531 | gidhash *tmp = uh->next; | |
532 | uh->grptr = tmp->grptr; | |
533 | uh->next = tmp->next; | |
534 | free (tmp); | |
535 | } | |
536 | else | |
537 | uh->grptr = NULL; | |
538 | } | |
539 | uh = uh->next; | |
540 | } | |
541 | ||
542 | free_grp (work->grp); | |
543 | if (work->next != NULL) | |
544 | { | |
545 | grphash *tmp = work->next; | |
546 | work->create = tmp->create; | |
547 | work->next = tmp->next; | |
548 | work->grp = tmp->grp; | |
549 | free (tmp); | |
550 | } | |
551 | else | |
552 | work->grp = NULL; | |
553 | } | |
554 | work = work->next; | |
555 | } | |
556 | } | |
557 | if (debug_flag > 2) | |
ba9234d9 | 558 | dbg_log (_("(grptable_update) Release wait lock")); |
d67281a7 UD |
559 | pthread_rwlock_unlock (&grplock); |
560 | sleep (20); | |
561 | } | |
562 | return NULL; | |
563 | } | |
564 | ||
ba9234d9 | 565 | static void * |
d67281a7 UD |
566 | negtable_update (void *v) |
567 | { | |
568 | time_t now; | |
569 | int i; | |
570 | ||
571 | sleep (30); | |
572 | ||
573 | while (!do_shutdown) | |
574 | { | |
575 | if (debug_flag > 2) | |
ba9234d9 | 576 | dbg_log (_("(neggrptable_update) Wait for write lock!")); |
d67281a7 UD |
577 | |
578 | pthread_rwlock_wrlock (&neglock); | |
579 | ||
580 | if (debug_flag > 2) | |
ba9234d9 | 581 | dbg_log (_("(neggrptable_update) Have write lock")); |
d67281a7 UD |
582 | |
583 | time (&now); | |
584 | for (i = 0; i < modulo; ++i) | |
585 | { | |
586 | neghash *work = &negtbl[i]; | |
587 | ||
588 | while (work && work->key) | |
589 | { | |
590 | if ((now - work->create) >= negtimeout) | |
591 | { | |
592 | if (debug_flag) | |
593 | dbg_log (_("Give \"%s\" free"), work->key); | |
594 | ||
595 | free (work->key); | |
596 | ||
597 | if (work->next != NULL) | |
598 | { | |
599 | neghash *tmp = work->next; | |
600 | work->create = tmp->create; | |
601 | work->next = tmp->next; | |
602 | work->key = tmp->key; | |
603 | free (tmp); | |
604 | } | |
605 | else | |
606 | work->key = NULL; | |
607 | } | |
608 | work = work->next; | |
609 | } | |
610 | } | |
611 | if (debug_flag > 2) | |
ba9234d9 | 612 | dbg_log (_("(neggrptable_update) Release wait lock")); |
d67281a7 UD |
613 | pthread_rwlock_unlock (&neglock); |
614 | sleep (10); | |
615 | } | |
616 | return NULL; | |
617 | } |