2 * $Id: cnid_open.c,v 1.22 2001-12-07 17:29:06 jmarcus Exp $
4 * Copyright (c) 1999. Adrian Sun (asun@zoology.washington.edu)
5 * All Rights Reserved. See COPYRIGHT.
7 * CNID database support.
10 * 1) afpd already caches did's.
11 * 2) the database stores cnid's as both did/name and dev/ino pairs.
12 * 3) RootInfo holds the value of the NextID.
13 * 4) the cnid database gets called in the following manner --
15 * cnid = cnid_open(root_dir);
18 * newid = cnid_add(cnid, dev, ino, parent did,
19 * name, id); id is a hint for a specific id. pass 0 if you don't
20 * care. if the id is already assigned, you won't get what you
23 * given an id, get a did/name and dev/ino pair.
24 * name = cnid_get(cnid, &id); given an id, return the corresponding
26 * return code = cnid_delete(cnid, id); delete an entry.
28 * with AFP, CNIDs 0-2 have special meanings. here they are:
30 * 1 -- parent of root directory (handled by afpd)
31 * 2 -- root directory (handled by afpd)
33 * so, CNID_START begins at 3.
38 #endif /* HAVE_CONFIG_H */
46 #endif /* HAVE_UNISTD_H */
49 #endif /* HAVE_FCNTL_H */
50 #include <sys/param.h>
56 #include <atalk/adouble.h>
57 #include <atalk/cnid.h>
58 #include <atalk/util.h>
60 #include "cnid_private.h"
63 #define MIN(a, b) ((a) < (b) ? (a) : (b))
66 #define DBHOME ".AppleDB"
67 #define DBCNID "cnid.db"
68 #define DBDEVINO "devino.db"
69 #define DBDIDNAME "didname.db" /* did/full name mapping */
70 #define DBSHORTNAME "shortname.db" /* did/8+3 mapping */
71 #define DBMACNAME "macname.db" /* did/31 mapping */
72 #define DBLONGNAME "longname.db" /* did/unicode mapping */
73 #define DBLOCKFILE "cnid.lock"
78 /* we version the did/name database so that we can change the format
79 * if necessary. the key is in the form of a did/name pair. in this case,
81 #define DBVERSION_KEY "\0\0\0\0\0"
82 #define DBVERSION_KEYLEN 5
83 #define DBVERSION1 0x00000001U
84 #define DBVERSION DBVERSION1
86 #if DB_VERSION_MINOR > 1
87 #define DBOPTIONS (DB_CREATE | DB_INIT_MPOOL | DB_INIT_LOCK | \
88 DB_INIT_LOG | DB_INIT_TXN)
89 #else /* DB_VERSION_MINOR < 1 */
90 #define DBOPTIONS (DB_CREATE | DB_INIT_MPOOL | DB_INIT_LOCK | \
91 DB_INIT_LOG | DB_INIT_TXN | DB_TXN_NOSYNC)
92 /*#define DBOPTIONS (DB_CREATE | DB_INIT_MPOOL | DB_INIT_LOCK | \
93 DB_INIT_LOG | DB_INIT_TXN)*/
94 #endif /* DB_VERSION_MINOR */
96 #define MAXITER 0xFFFF /* maximum number of simultaneously open CNID
99 /* the first compare that's always done. */
100 static __inline__ int compare_did(const DBT *a, const DBT *b)
102 u_int32_t dida, didb;
104 memcpy(&dida, a->data, sizeof(dida));
105 memcpy(&didb, b->data, sizeof(didb));
109 /* sort did's and then names. this is for unix paths.
110 * i.e., did/unixname lookups. */
111 #if DB_VERSION_MINOR > 1
112 static int compare_unix(DB *db, const DBT *a, const DBT *b)
113 #else /* DB_VERSION_MINOR < 1 */
114 static int compare_unix(const DBT *a, const DBT *b)
115 #endif /* DB_VERSION_MINOR */
121 if ((ret = compare_did(a, b)))
124 sa = (u_int8_t *) a->data + 4; /* shift past did */
125 sb = (u_int8_t *) b->data + 4;
126 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
127 if ((ret = (*sa - *sb)))
128 return ret; /* sort by lexical ordering */
130 return a->size - b->size; /* sort by length */
133 /* sort did's and then names. this is for macified paths (i.e.,
134 * did/macname, and did/shortname. i think did/longname needs a
135 * unicode table to work. also, we can't use strdiacasecmp as that
136 * returns a match if a < b. */
137 #if DB_VERSION_MINOR > 1
138 static int compare_mac(DB *db, const DBT *a, const DBT *b)
139 #else /* DB_VERSION_MINOR < 1 */
140 static int compare_mac(const DBT *a, const DBT *b)
141 #endif /* DB_VERSION_MINOR */
147 if ((ret = compare_did(a, b)))
150 sa = (u_int8_t *) a->data + 4;
151 sb = (u_int8_t *) b->data + 4;
152 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
153 if ((ret = (_diacasemap[*sa] - _diacasemap[*sb])))
154 return ret; /* sort by lexical ordering */
156 return a->size - b->size; /* sort by length */
160 /* for unicode names -- right now it's the same as compare_mac. */
161 #if DB_VERSION_MINOR > 1
162 static int compare_unicode(DB *db, const DBT *a, const DBT *b)
163 #else /* DB_VERSION_MINOR < 1 */
164 static int compare_unicode(const DBT *a, const DBT *b)
165 #endif /* DB_VERSION_MINOR */
167 #if DB_VERSION_MINOR > 1
168 return compare_mac(db,a,b);
169 #else /* DB_VERSION_MINOR < 1 */
170 return compare_mac(a,b);
171 #endif /* DB_VERSION_MINOR */
174 static int have_lock = 0;
176 void *cnid_open(const char *dir) {
179 char path[MAXPATHLEN + 1];
183 u_int32_t DBEXTRAS = 0;
191 /* this checks .AppleDB */
192 if ((len = strlen(dir)) > (MAXPATHLEN - DBLEN - 1)) {
193 syslog(LOG_ERR, "cnid_open: Pathname too large: %s", dir);
197 if ((db = (CNID_private *)calloc(1, sizeof(CNID_private))) == NULL) {
198 syslog(LOG_ERR, "cnid_open: Unable to allocate memory for database");
202 db->magic = CNID_DB_MAGIC;
205 if (path[len - 1] != '/') {
210 lock.l_type = F_WRLCK;
211 lock.l_whence = SEEK_SET;
213 strcpy(path + len, DBHOME);
214 if ((stat(path, &st) < 0) && (ad_mkdir(path, 0777) < 0)) {
215 syslog(LOG_ERR, "cnid_open: DBHOME mkdir failed for %s", path);
219 /* Make sure cnid.lock goes in .AppleDB. */
223 /* Search for a byte lock. This allows us to cleanup the log files
224 * at cnid_close() in a clean fashion.
226 * NOTE: This won't work if multiple volumes for the same user refer
227 * to the sahe directory. */
228 strcat(path, DBLOCKFILE);
229 if ((db->lockfd = open(path, O_RDWR | O_CREAT, 0666)) > -1) {
232 while (fcntl(db->lockfd, F_SETLK, &lock) < 0) {
233 if (++lock.l_start > MAXITER) {
234 syslog(LOG_INFO, "cnid_open: Cannot establish logfile cleanup for database environment %s lock (lock failed)", path);
242 syslog(LOG_INFO, "cnid_open: Cannot establish logfile cleanup lock for database environment %s (open() failed)", path);
245 if (!have_lock && db->lockfd > -1 && lock.l_start == 0) {
246 /* We test to see if we have exclusive database access. If we do, we
247 * will open the database with the DB_RECOVER flag.
250 syslog(LOG_INFO, "cnid_open: Opening database environment %s with DB_RECOVER flag", path);
252 DBEXTRAS |= DB_RECOVER;
257 path[len + DBHOMELEN] = '\0';
258 open_flag = DB_CREATE;
260 /* We need to be able to open the database environment with full
261 * transaction, logging, and locking support if we ever hope to
262 * be a true multi-acess file server. */
263 if ((rc = db_env_create(&db->dbenv, 0)) != 0) {
264 syslog(LOG_ERR, "cnid_open: db_env_create: %s", db_strerror(rc));
268 /* Setup internal deadlock detection. */
269 if ((rc = db->dbenv->set_lk_detect(db->dbenv, DB_LOCK_DEFAULT)) != 0) {
270 syslog(LOG_ERR, "cnid_open: set_lk_detect: %s", db_strerror(rc));
274 #if DB_VERSION_MINOR > 1
275 /* Take care of setting the DB_TXN_NOSYNC flag in db3 > 3.1.x. */
276 if ((rc = db->dbenv->set_flags(db->dbenv, DB_TXN_NOSYNC, 1)) != 0) {
277 syslog(LOG_ERR, "cnid_open: set_flags: %s", db_strerror(rc));
280 #endif /* DB_VERSION_MINOR > 1 */
282 /* Open the database environment. */
283 if ((rc = db->dbenv->open(db->dbenv, path, DBOPTIONS | DBEXTRAS, 0666)) != 0) {
284 if (rc == DB_RUNRECOVERY) {
285 /* This is the mother of all errors. We _must_ fail here. */
286 syslog(LOG_ERR, "cnid_open: CATASTROPHIC ERROR opening database environment %s. Run db_recovery -c immediately", path);
290 /* We can't get a full transactional environment, so multi-access
291 * is out of the question. Let's assume a read-only environment,
292 * and try to at least get a shared memory pool. */
293 if ((rc = db->dbenv->open(db->dbenv, path, DB_INIT_MPOOL, 0666)) != 0) {
294 /* Nope, not a MPOOL, either. Last-ditch effort: we'll try to
295 * open the environment with no flags. */
296 if ((rc = db->dbenv->open(db->dbenv, path, 0, 0666)) != 0) {
297 syslog(LOG_ERR, "cnid_open: dbenv->open of %s failed: %s",
298 path, db_strerror(rc));
302 db->flags |= CNIDFLAG_DB_RO;
303 open_flag = DB_RDONLY;
304 syslog(LOG_INFO, "cnid_open: Obtained read-only database environment %s", path);
307 /* did/name reverse mapping. We use a BTree for this one. */
308 if ((rc = db_create(&db->db_didname, db->dbenv, 0)) != 0) {
309 syslog(LOG_ERR, "cnid_open: Failed to create did/name database: %s",
314 db->db_didname->set_bt_compare(db->db_didname, &compare_unix);
315 if ((rc = db->db_didname->open(db->db_didname, DBDIDNAME, NULL,
316 DB_BTREE, open_flag, 0666))) {
317 syslog(LOG_ERR, "cnid_open: Failed to open did/name database: %s",
322 /* Check for version. This way we can update the database if we need
323 * to change the format in any way. */
324 memset(&key, 0, sizeof(key));
325 memset(&data, 0, sizeof(data));
326 key.data = DBVERSION_KEY;
327 key.size = DBVERSION_KEYLEN;
330 if ((rc = txn_begin(db->dbenv, NULL, &tid, 0)) != 0) {
331 syslog(LOG_ERR, "cnid_open: txn_begin: failed to check db version: %s",
333 db->db_didname->close(db->db_didname, 0);
337 while ((rc = db->db_didname->get(db->db_didname, tid, &key, &data, DB_RMW))) {
340 case DB_LOCK_DEADLOCK:
341 if ((ret = txn_abort(tid)) != 0) {
342 syslog(LOG_ERR, "cnid_open: txn_abort: %s", db_strerror(ret));
343 db->db_didname->close(db->db_didname, 0);
346 goto dbversion_retry;
349 u_int32_t version = htonl(DBVERSION);
351 data.data = &version;
352 data.size = sizeof(version);
355 if ((ret = db->db_didname->put(db->db_didname, tid, &key, &data,
357 if (ret == DB_LOCK_DEADLOCK) {
358 if ((ret = txn_abort(tid)) != 0) {
359 syslog(LOG_ERR, "cnid_open: txn_abort: %s",
361 db->db_didname->close(db->db_didname, 0);
364 goto dbversion_retry;
366 else if (ret == DB_RUNRECOVERY) {
367 /* At this point, we don't care if the transaction aborts
368 * successfully or not. */
370 syslog(LOG_ERR, "cnid_open: Error putting new version: %s",
372 db->db_didname->close(db->db_didname, 0);
376 break; /* while loop */
379 syslog(LOG_ERR, "cnid_open: Failed to check db version: %s",
381 db->db_didname->close(db->db_didname, 0);
386 if ((rc = txn_commit(tid, 0)) != 0) {
387 syslog(LOG_ERR, "cnid_open: Failed to commit db version: %s",
389 db->db_didname->close(db->db_didname, 0);
393 /* TODO In the future we might check for version number here. */
395 memcpy(&version, data.data, sizeof(version));
396 if (version != ntohl(DBVERSION)) {
402 /* did/macname (31 character) mapping. Use a BTree for this one. */
403 if ((rc = db_create(&db->db_macname, db->dbenv, 0)) != 0) {
404 syslog(LOG_ERR, "cnid_open: Failed to create did/macname database: %s",
406 db->db_didname->close(db->db_didname, 0);
410 db->db_macname->set_bt_compare(db->db_macname, &compare_mac);
411 if ((rc = db->db_macname->open(db->db_macname, DBMACNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
412 syslog(LOG_ERR, "cnid_open: Failed to open did/macname database: %s",
414 db->db_didname->close(db->db_didname, 0);
418 /* did/shortname (DOS 8.3) mapping. Use a BTree for this one. */
419 if ((rc = db_create(&db->db_shortname, db->dbenv, 0)) != 0) {
420 syslog(LOG_ERR, "cnid_open: Failed to create did/shortname database: %s",
422 db->db_didname->close(db->db_didname, 0);
423 db->db_macname->close(db->db_macname, 0);
427 db->db_shortname->set_bt_compare(db->db_shortname, &compare_mac);
428 if ((rc = db->db_shortname->open(db->db_shortname, DBSHORTNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
429 syslog(LOG_ERR, "cnid_open: Failed to open did/shortname database: %s",
431 db->db_didname->close(db->db_didname, 0);
432 db->db_macname->close(db->db_macname, 0);
436 /* did/longname (Unicode) mapping. Use a BTree for this one. */
437 if ((rc = db_create(&db->db_longname, db->dbenv, 0)) != 0) {
438 syslog(LOG_ERR, "cnid_open: Failed to create did/longname database: %s",
440 db->db_didname->close(db->db_didname, 0);
441 db->db_macname->close(db->db_macname, 0);
442 db->db_shortname->close(db->db_shortname, 0);
446 db->db_longname->set_bt_compare(db->db_longname, &compare_unicode);
447 if ((rc = db->db_longname->open(db->db_longname, DBLONGNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
448 syslog(LOG_ERR, "cnid_open: Failed to open did/longname database: %s",
450 db->db_didname->close(db->db_didname, 0);
451 db->db_macname->close(db->db_macname, 0);
452 db->db_shortname->close(db->db_shortname, 0);
455 #endif /* EXTENDED_DB */
457 /* dev/ino reverse mapping. Use a hash for this one. */
458 if ((rc = db_create(&db->db_devino, db->dbenv, 0)) != 0) {
459 syslog(LOG_ERR, "cnid_open: Failed to create dev/ino database: %s",
461 db->db_didname->close(db->db_didname, 0);
463 db->db_macname->close(db->db_macname, 0);
464 db->db_shortname->close(db->db_shortname, 0);
465 db->db_longname->close(db->db_longname, 0);
466 #endif /* EXTENDED_DB */
470 if ((rc = db->db_devino->open(db->db_devino, DBDEVINO, NULL, DB_HASH, open_flag, 0666)) != 0) {
471 syslog(LOG_ERR, "cnid_open: Failed to open devino database: %s",
473 db->db_didname->close(db->db_didname, 0);
475 db->db_macname->close(db->db_macname, 0);
476 db->db_shortname->close(db->db_shortname, 0);
477 db->db_longname->close(db->db_longname, 0);
478 #endif /* EXTENDED_DB */
482 /* Main CNID database. Use a hash for this one. */
483 if ((rc = db_create(&db->db_cnid, db->dbenv, 0)) != 0) {
484 syslog(LOG_ERR, "cnid_open: Failed to create cnid database: %s",
486 db->db_didname->close(db->db_didname, 0);
488 db->db_macname->close(db->db_macname, 0);
489 db->db_shortname->close(db->db_shortname, 0);
490 db->db_longname->close(db->db_longname, 0);
491 #endif /* EXTENDED_DB */
492 db->db_devino->close(db->db_devino, 0);
497 if ((rc = db->db_cnid->open(db->db_cnid, DBCNID, NULL, DB_HASH, open_flag, 0666)) != 0) {
498 syslog(LOG_ERR, "cnid_open: Failed to open dev/ino database: %s",
500 db->db_didname->close(db->db_didname, 0);
502 db->db_macname->close(db->db_macname, 0);
503 db->db_shortname->close(db->db_shortname, 0);
504 db->db_longname->close(db->db_longname, 0);
505 #endif /* EXTENDED_DB */
512 syslog(LOG_ERR, "cnid_open: Failed to setup CNID DB environment");
513 db->dbenv->close(db->dbenv, 0);
516 if (db->lockfd > -1) {