2 * $Id: cnid_open.c,v 1.3 2001-08-14 14:00:10 rufustfirefly 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 */
45 #endif /* HAVE_UNISTD_H */
48 #endif /* HAVE_FCNTL_H */
49 #include <sys/param.h>
55 #include <atalk/adouble.h>
56 #include <atalk/cnid.h>
57 #include <atalk/util.h>
59 #include "cnid_private.h"
62 #define MIN(a, b) ((a) < (b) ? (a) : (b))
65 #define DBHOME ".AppleDB"
66 #define DBCNID "cnid.db"
67 #define DBDEVINO "devino.db"
68 #define DBDIDNAME "didname.db" /* did/full name mapping */
69 #define DBSHORTNAME "shortname.db" /* did/8+3 mapping */
70 #define DBMACNAME "macname.db" /* did/31 mapping */
71 #define DBLONGNAME "longname.db" /* did/unicode mapping */
72 #define DBLOCKFILE "cnid.lock"
77 /* we version the did/name database so that we can change the format
78 * if necessary. the key is in the form of a did/name pair. in this case,
80 #define DBVERSION_KEY "\0\0\0\0\0"
81 #define DBVERSION_KEYLEN 5
82 #define DBVERSION1 0x00000001U
83 #define DBVERSION DBVERSION1
85 #define DBOPTIONS (DB_CREATE | DB_INIT_MPOOL | DB_INIT_LOCK | \
86 DB_INIT_LOG | DB_INIT_TXN | DB_TXN_NOSYNC | DB_RECOVER)
88 #define MAXITER 0xFFFF /* maximum number of simultaneously open CNID
91 /* the first compare that's always done. */
92 static __inline__ int compare_did(const DBT *a, const DBT *b)
96 memcpy(&dida, a->data, sizeof(dida));
97 memcpy(&didb, b->data, sizeof(didb));
101 /* sort did's and then names. this is for unix paths.
102 * i.e., did/unixname lookups. */
103 static int compare_unix(const DBT *a, const DBT *b)
109 if (ret = compare_did(a, b))
112 sa = a->data + 4; /* shift past did */
114 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
115 if (ret = (*sa - *sb))
116 return ret; /* sort by lexical ordering */
118 return a->size - b->size; /* sort by length */
121 /* sort did's and then names. this is for macified paths (i.e.,
122 * did/macname, and did/shortname. i think did/longname needs a
123 * unicode table to work. also, we can't use strdiacasecmp as that
124 * returns a match if a < b. */
125 static int compare_mac(const DBT *a, const DBT *b)
131 if (ret = compare_did(a, b))
136 for (len = MIN(a->size, b->size); len-- > 4; sa++, sb++)
137 if (ret = (_diacasemap[*sa] - _diacasemap[*sb]))
138 return ret; /* sort by lexical ordering */
140 return a->size - b->size; /* sort by length */
144 /* for unicode names -- right now it's the same as compare_mac. */
145 static int compare_unicode(const DBT *a, const DBT *b)
147 return compare_mac(a,b);
150 void *cnid_open(const char *dir)
154 char path[MAXPATHLEN + 1];
162 /* this checks .AppleDB */
163 if ((len = strlen(dir)) > (MAXPATHLEN - DBLEN - 1)) {
164 syslog(LOG_ERR, "cnid_open: path too large");
168 if ((db = (CNID_private *) calloc(1, sizeof(CNID_private))) == NULL) {
169 syslog(LOG_ERR, "cnid_open: unable to allocate memory");
172 db->magic = CNID_DB_MAGIC;
175 if (path[len - 1] != '/') {
180 lock.l_type = F_WRLCK;
181 lock.l_whence = SEEK_SET;
184 strcpy(path + len, DBHOME);
185 if ((stat(path, &st) < 0) && (ad_mkdir(path, 0777) < 0)) {
186 syslog(LOG_ERR, "cnid_open: mkdir failed");
190 /* search for a byte lock. this allows us to cleanup the log files
191 * at cnid_close() in a clean fashion.
193 * NOTE: this won't work if multiple volumes for the same user refer
194 * to the same directory. */
195 strcat(path, DBLOCKFILE);
196 if ((db->lockfd = open(path, O_RDWR | O_CREAT, 0666)) > -1) {
199 while (fcntl(db->lockfd, F_SETLK, &lock) < 0) {
200 if (++lock.l_start > MAXITER) {
201 syslog(LOG_INFO, "cnid_open: can't establish logfile cleanup lock.");
209 path[len + DBHOMELEN] = '\0';
210 open_flag = DB_CREATE;
211 /* try a full-blown transactional environment */
212 if (db_env_create(&db->dbenv, 0)) {
213 syslog(LOG_ERR, "cnid_open: db_env_create failed");
217 if (db->dbenv->open(db->dbenv, path, DBOPTIONS, 0666)) {
219 /* try with a shared memory pool */
220 if (db->dbenv->open(db->dbenv, path, DB_INIT_MPOOL, 0666)) {
222 /* try without any options. */
223 if (db->dbenv->open(db->dbenv, path, 0, 0666)) {
224 syslog(LOG_ERR, "cnid_open: db_env_open failed");
228 db->flags |= CNIDFLAG_DB_RO;
229 open_flag = DB_RDONLY;
230 syslog(LOG_INFO, "cnid_open: read-only CNID database");
233 /* did/name reverse mapping. we use a btree for this one. */
234 if (db_create(&db->db_didname, db->dbenv, 0))
237 db->db_didname->set_bt_compare(db->db_didname, compare_unix);
238 if (db->db_didname->open(db->db_didname, DBDIDNAME, NULL, DB_BTREE, open_flag, 0666)) {
242 /* check for version. this way we can update the database if we need
243 to change the format in any way. */
244 memset(&key, 0, sizeof(key));
245 memset(&data, 0, sizeof(data));
246 key.data = DBVERSION_KEY;
247 key.size = DBVERSION_KEYLEN;
248 while (errno = db->db_didname->get(db->db_didname, NULL, &key, &data, 0)) {
255 u_int32_t version = htonl(DBVERSION);
257 data.data = &version;
258 data.size = sizeof(version);
261 if (db->db_didname->put(db->db_didname, NULL, &key, &data,
264 goto dbversion_retry;
267 /* uh oh. something bad happened. bail. */
268 db->db_didname->close(db->db_didname, 0);
273 /* XXX: in the future, we might check for version number here. */
275 memcpy(&version, data.data, sizeof(version));
276 if (version != htonl(DBVERSION)) {
282 /* did/macname mapping. btree this one. */
283 if (db_create(&db->db_macname, db->dbenv, 0))
286 db->db_macname->set_bt_compare(db->db_macname, compare_mac);
287 if (db->db_macname->open(db->db_macname, DBMACNAME, NULL, DB_BTREE, open_flag, 0666)) {
288 db->db_didname->close(db->db_didname, 0);
292 /* did/shortname mapping */
293 if (db_create(&db->db_shortname, db->dbenv, 0))
296 db->db_shortname->set_bt_compare(db->db_shortname, compare_mac);
297 if (db->db_shortname->open(db->db_shortname, DBSHORTNAME, NULL, DB_BTREE, open_flag, 0666)) {
298 db->db_didname->close(db->db_didname, 0);
299 db->db_macname->close(db->db_macname, 0);
303 /* did/longname mapping */
304 if (db_create(&db->db_longname, db->dbenv, 0))
307 db->db_longname->set_bt_compare(db->db_longname, compare_unicode);
308 if (db->db_longname->open(db->db_longname, DBLONGNAME, NULL, DB_BTREE, open_flag, 0666)) {
309 db->db_didname->close(db->db_didname, 0);
310 db->db_macname->close(db->db_macname, 0);
311 db->db_shortname->close(db->db_shortname, 0);
314 #endif /* EXTENDED_DB */
316 /* dev/ino reverse mapping. we hash this one. */
317 if (db_create(&db->db_devino, db->dbenv, 0))
320 if (db->db_devino->open(db->db_devino, DBDEVINO, NULL, DB_HASH, open_flag, 0666)) {
321 db->db_didname->close(db->db_didname, 0);
323 db->db_macname->close(db->db_macname, 0);
324 db->db_shortname->close(db->db_shortname, 0);
325 db->db_longname->close(db->db_longname, 0);
326 #endif /* EXTENDED_DB */
330 /* main cnid database. we hash this one as well. */
331 if (db_create(&db->db_cnid, db->dbenv, 0))
334 if (db->db_cnid->open(db->db_cnid, DBCNID, NULL, DB_HASH, open_flag, 0666)) {
335 db->db_didname->close(db->db_didname, 0);
337 db->db_macname->close(db->db_macname, 0);
338 db->db_shortname->close(db->db_shortname, 0);
339 db->db_longname->close(db->db_longname, 0);
340 #endif /* EXTENDED_DB */
341 db->db_devino->close(db->db_devino, 0);
348 syslog(LOG_ERR, "cnid_open: db_open failed");
349 db->dbenv->close(db->dbenv, 0);
350 /* db->dbenv->remove(db->dbenv, db->dbenv->db_home, 0); */