2 * $Id: cnid_open.c,v 1.16 2001-10-21 08:38:30 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 #endif /* DB_VERSION_MINOR */
94 #define MAXITER 0xFFFF /* maximum number of simultaneously open CNID
97 /* the first compare that's always done. */
98 static __inline__ int compare_did(const DBT *a, const DBT *b)
100 u_int32_t dida, didb;
102 memcpy(&dida, a->data, sizeof(dida));
103 memcpy(&didb, b->data, sizeof(didb));
107 /* sort did's and then names. this is for unix paths.
108 * i.e., did/unixname lookups. */
109 #if DB_VERSION_MINOR > 1
110 static int compare_unix(DB *db, const DBT *a, const DBT *b)
111 #else /* DB_VERSION_MINOR < 1 */
112 static int compare_unix(const DBT *a, const DBT *b)
113 #endif /* DB_VERSION_MINOR */
119 if ((ret = compare_did(a, b)))
122 sa = (u_int8_t *) a->data + 4; /* shift past did */
123 sb = (u_int8_t *) b->data + 4;
124 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
125 if ((ret = (*sa - *sb)))
126 return ret; /* sort by lexical ordering */
128 return a->size - b->size; /* sort by length */
131 /* sort did's and then names. this is for macified paths (i.e.,
132 * did/macname, and did/shortname. i think did/longname needs a
133 * unicode table to work. also, we can't use strdiacasecmp as that
134 * returns a match if a < b. */
135 #if DB_VERSION_MINOR > 1
136 static int compare_mac(DB *db, const DBT *a, const DBT *b)
137 #else /* DB_VERSION_MINOR < 1 */
138 static int compare_mac(const DBT *a, const DBT *b)
139 #endif /* DB_VERSION_MINOR */
145 if ((ret = compare_did(a, b)))
148 sa = (u_int8_t *) a->data + 4;
149 sb = (u_int8_t *) b->data + 4;
150 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
151 if ((ret = (_diacasemap[*sa] - _diacasemap[*sb])))
152 return ret; /* sort by lexical ordering */
154 return a->size - b->size; /* sort by length */
158 /* for unicode names -- right now it's the same as compare_mac. */
159 #if DB_VERSION_MINOR > 1
160 static int compare_unicode(DB *db, const DBT *a, const DBT *b)
161 #else /* DB_VERSION_MINOR < 1 */
162 static int compare_unicode(const DBT *a, const DBT *b)
163 #endif /* DB_VERSION_MINOR */
165 #if DB_VERSION_MINOR > 1
166 return compare_mac(db,a,b);
167 #else /* DB_VERSION_MINOR < 1 */
168 return compare_mac(a,b);
169 #endif /* DB_VERSION_MINOR */
172 void *cnid_open(const char *dir) {
175 char path[MAXPATHLEN + 1];
186 /* this checks .AppleDB */
187 if ((len = strlen(dir)) > (MAXPATHLEN - DBLEN - 1)) {
188 syslog(LOG_ERR, "cnid_open: Pathname too large: %s", dir);
192 if ((db = (CNID_private *)calloc(1, sizeof(CNID_private))) == NULL) {
193 syslog(LOG_ERR, "cnid_open: Unable to allocate memory for database");
197 db->magic = CNID_DB_MAGIC;
200 if (path[len - 1] != '/') {
205 lock.l_type = F_WRLCK;
206 lock.l_whence = SEEK_SET;
208 strcpy(path + len, DBHOME);
209 if ((stat(path, &st) < 0) && (ad_mkdir(path, 0777) < 0)) {
210 syslog(LOG_ERR, "cnid_open: DBHOME mkdir failed");
214 /* Search for a byte lock. This allows us to cleanup the log files
215 * at cnid_close() in a clean fashion.
217 * NOTE: This won't work if multiple volumes for the same user refer
218 * to the sahe directory. */
219 strcat(path, DBLOCKFILE);
220 if ((db->lockfd = open(path, O_RDWR | O_CREAT, 0666)) > -1) {
223 while (fcntl(db->lockfd, F_SETLK, &lock) < 0) {
224 if (++lock.l_start > MAXITER) {
225 syslog(LOG_INFO, "cnid_open: Cannot establish logfile cleanup lock.");
233 path[len + DBHOMELEN] = '\0';
234 open_flag = DB_CREATE;
236 /* We need to be able to open the database environment with full
237 * transaction, logging, and locking support if we ever hope to
238 * be a true multi-acess file server. */
239 if ((rc = db_env_create(&db->dbenv, 0)) != 0) {
240 syslog(LOG_ERR, "cnid_open: db_env_create: %s", db_strerror(rc));
244 /* Setup internal deadlock detection. */
245 if ((rc = db->dbenv->set_lk_detect(db->dbenv, DB_LOCK_DEFAULT)) != 0) {
246 syslog(LOG_ERR, "cnid_open: set_lk_detect: %s", db_strerror(rc));
250 #if DB_VERSION_MINOR > 1
251 /* Take care of setting the DB_TXN_NOSYNC flag in db3 > 3.1.x. */
252 if ((rc = db->dbenv->set_flags(db->dbenv, DB_TXN_NOSYNC, 1)) != 0) {
253 syslog(LOG_ERR, "cnid_open: set_flags: %s", db_strerror(rc));
256 #endif /* DB_VERSION_MINOR > 1 */
258 /* Open the database environment. */
259 if ((rc = db->dbenv->open(db->dbenv, path, DBOPTIONS, 0666)) != 0) {
260 if (rc == DB_RUNRECOVERY) {
261 /* This is the mother of all errors. We _must_ fail here. */
262 syslog(LOG_ERR, "cnid_open: CATASTROPHIC ERROR opening database environment. Run db_recovery immediately");
266 /* We can't get a full transactional environment, so multi-access
267 * is out of the question. Let's assume a read-only environment,
268 * and trry to at least get a shared memory pool. */
269 if ((rc = db->dbenv->open(db->dbenv, path, DB_INIT_MPOOL, 0666)) != 0) {
270 /* Nope, not a MPOOL, either. Last-ditch effort: we'll try to
271 * open the environment with no flags. */
272 if ((rc = db->dbenv->open(db->dbenv, path, 0, 0666)) != 0) {
273 syslog(LOG_ERR, "cnid_open: dbenv->open of %s failed: %s",
274 path, db_strerror(rc));
278 db->flags |= CNIDFLAG_DB_RO;
279 open_flag = DB_RDONLY;
280 syslog(LOG_INFO, "cnid_open: Obtained read-only database environment");
283 /* did/name reverse mapping. We use a BTree for this one. */
284 if ((rc = db_create(&db->db_didname, db->dbenv, 0)) != 0) {
285 syslog(LOG_ERR, "cnid_open: Failed to create did/name database: %s",
290 db->db_didname->set_bt_compare(db->db_didname, &compare_unix);
291 if ((rc = db->db_didname->open(db->db_didname, DBDIDNAME, NULL,
292 DB_BTREE, open_flag, 0666))) {
293 syslog(LOG_ERR, "cnid_open: Failed to open did/name database: %s",
298 /* Check for version. This way we can update the database if we need
299 * to change the format in any way. */
300 memset(&key, 0, sizeof(key));
301 memset(&data, 0, sizeof(data));
302 key.data = DBVERSION_KEY;
303 key.size = DBVERSION_KEYLEN;
306 if ((rc = txn_begin(db->dbenv, NULL, &tid, 0)) != 0) {
307 syslog(LOG_ERR, "cnid_open: txn_begin: failed to check db version: %s",
309 db->db_didname->close(db->db_didname, 0);
313 while ((rc = db->db_didname->get(db->db_didname, tid, &key, &data, DB_RMW))) {
316 case DB_LOCK_DEADLOCK:
317 if ((ret = txn_abort(tid)) != 0) {
318 syslog(LOG_ERR, "cnid_open: txn_abort: %s", db_strerror(ret));
319 db->db_didname->close(db->db_didname, 0);
322 goto dbversion_retry;
325 u_int32_t version = htonl(DBVERSION);
327 data.data = &version;
328 data.size = sizeof(version);
331 if ((ret = db->db_didname->put(db->db_didname, tid, &key, &data,
333 if (ret == DB_LOCK_DEADLOCK) {
334 if ((ret = txn_abort(tid)) != 0) {
335 syslog(LOG_ERR, "cnid_open: txn_abort: %s",
337 db->db_didname->close(db->db_didname, 0);
340 goto dbversion_retry;
342 else if (ret == DB_RUNRECOVERY) {
343 /* At this point, we don't care if the transaction aborts
344 * successfully or not. */
346 syslog(LOG_ERR, "cnid_open: Error putting new version: %s",
348 db->db_didname->close(db->db_didname, 0);
352 break; /* while loop */
355 syslog(LOG_ERR, "cnid_open: Failed to check db version: %s",
357 db->db_didname->close(db->db_didname, 0);
362 if ((rc = txn_commit(tid, 0)) != 0) {
363 syslog(LOG_ERR, "cnid_open: Failed to commit db version: %s",
365 db->db_didname->close(db->db_didname, 0);
369 /* TODO In the future we might check for version number here. */
371 memcpy(&version, data.data, sizeof(version));
372 if (version != ntohl(DBVERSION)) {
378 /* did/macname (31 character) mapping. Use a BTree for this one. */
379 if ((rc = db_create(&db->db_macname, db->dbenv, 0)) != 0) {
380 syslog(LOG_ERR, "cnid_open: Failed to create did/macname database: %s",
382 db->db_didname->close(db->db_didname, 0);
386 db->db_macname->set_bt_compare(db->db_macname, &compare_mac);
387 if ((rc = db->db_macname->open(db->db_macname, DBMACNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
388 syslog(LOG_ERR, "cnid_open: Failed to open did/macname database: %s",
390 db->db_didname->close(db->db_didname, 0);
394 /* did/shortname (DOS 8.3) mapping. Use a BTree for this one. */
395 if ((rc = db_create(&db->db_shortname, db->dbenv, 0)) != 0) {
396 syslog(LOG_ERR, "cnid_open: Failed to create did/shortname database: %s",
398 db->db_didname->close(db->db_didname, 0);
399 db->db_macname->close(db->db_macname, 0);
403 db->db_shortname->set_bt_compare(db->db_shortname, &compare_mac);
404 if ((rc = db->db_shortname->open(db->db_shortname, DBSHORTNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
405 syslog(LOG_ERR, "cnid_open: Failed to open did/shortname database: %s",
407 db->db_didname->close(db->db_didname, 0);
408 db->db_macname->close(db->db_macname, 0);
412 /* did/longname (Unicode) mapping. Use a BTree for this one. */
413 if ((rc = db_create(&db->db_longname, db->dbenv, 0)) != 0) {
414 syslog(LOG_ERR, "cnid_open: Failed to create did/longname database: %s",
416 db->db_didname->close(db->db_didname, 0);
417 db->db_macname->close(db->db_macname, 0);
418 db->db_shortname->close(db->db_shortname, 0);
422 db->db_longname->set_bt_compare(db->db_longname, &compare_unicode);
423 if ((rc = db->db_longname->open(db->db_longname, DBLONGNAME, NULL, DB_BTREE, open_flag, 0666)) != 0) {
424 syslog(LOG_ERR, "cnid_open: Failed to open did/longname database: %s",
426 db->db_didname->close(db->db_didname, 0);
427 db->db_macname->close(db->db_macname, 0);
428 db->db_shortname->close(db->db_shortname, 0);
431 #endif /* EXTENDED_DB */
433 /* dev/ino reverse mapping. Use a hash for this one. */
434 if ((rc = db_create(&db->db_devino, db->dbenv, 0)) != 0) {
435 syslog(LOG_ERR, "cnid_open: Failed to create dev/ino database: %s",
437 db->db_didname->close(db->db_didname, 0);
439 db->db_macname->close(db->db_macname, 0);
440 db->db_shortname->close(db->db_shortname, 0);
441 db->db_longname->close(db->db_longname, 0);
442 #endif /* EXTENDED_DB */
446 if ((rc = db->db_devino->open(db->db_devino, DBDEVINO, NULL, DB_HASH, open_flag, 0666)) != 0) {
447 syslog(LOG_ERR, "cnid_open: Failed to open devino database: %s",
449 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);
453 db->db_longname->close(db->db_longname, 0);
454 #endif /* EXTENDED_DB */
458 /* Main CNID database. Use a hash for this one. */
459 if ((rc = db_create(&db->db_cnid, db->dbenv, 0)) != 0) {
460 syslog(LOG_ERR, "cnid_open: Failed to create cnid database: %s",
462 db->db_didname->close(db->db_didname, 0);
464 db->db_macname->close(db->db_macname, 0);
465 db->db_shortname->close(db->db_shortname, 0);
466 db->db_longname->close(db->db_longname, 0);
467 #endif /* EXTENDED_DB */
468 db->db_devino->close(db->db_devino, 0);
473 if ((rc = db->db_cnid->open(db->db_cnid, DBCNID, NULL, DB_HASH, open_flag, 0666)) != 0) {
474 syslog(LOG_ERR, "cnid_open: Failed to open dev/ino database: %s",
476 db->db_didname->close(db->db_didname, 0);
478 db->db_macname->close(db->db_macname, 0);
479 db->db_shortname->close(db->db_shortname, 0);
480 db->db_longname->close(db->db_longname, 0);
481 #endif /* EXTENDED_DB */
488 syslog(LOG_ERR, "cnid_open: Failed to setup CNID DB environment");
489 db->dbenv->close(db->dbenv, 0);
492 if (db->lockfd > -1) {