2 * $Id: cnid.c,v 1.11 2009-11-28 13:09:26 didg Exp $
4 * Copyright (c) 2003 the Netatalk Team
5 * Copyright (c) 2003 Rafal Lewczuk <rlewczuk@pronet.pl>
7 * This program is free software; you can redistribute and/or modify
8 * it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation version 2 of the License or later
10 * version if explicitly stated by any of above copyright holders.
17 #endif /* HAVE_CONFIG_H */
19 #include <sys/types.h>
22 #include <sys/param.h>
30 #include <atalk/cnid.h>
31 #include <atalk/list.h>
32 #include <atalk/logger.h>
33 #include <atalk/util.h>
35 /* List of all registered modules. */
36 static struct list_head modules = ATALK_LIST_HEAD_INIT(modules);
38 static sigset_t sigblockset;
39 static const struct itimerval none = {{0, 0}, {0, 0}};
41 /* Registers new CNID backend module. */
43 /* Once module has been registered, it cannot be unregistered. */
44 void cnid_register(struct _cnid_module *module)
46 struct list_head *ptr;
48 /* Check if our module is already registered. */
49 list_for_each(ptr, &modules)
50 if (0 == strcmp(list_entry(ptr, cnid_module, db_list)->name, module->name)) {
51 LOG(log_error, logtype_afpd, "Module with name [%s] is already registered !", module->name);
55 LOG(log_info, logtype_afpd, "Registering CNID module [%s]", module->name);
56 ptr = &(module->db_list);
57 list_add_tail(ptr, &modules);
61 static int cnid_dir(const char *dir, mode_t mask)
66 if (stat(dir, &st) < 0) {
69 if (ad_stat( dir, &st) < 0)
72 LOG(log_info, logtype_cnid, "Setting uid/gid to %d/%d", st.st_uid, st.st_gid);
73 if (setegid(st.st_gid) < 0 || seteuid(st.st_uid) < 0) {
74 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
78 if (mkdir(dir, 0777 & ~mask) < 0)
81 strlcpy(tmp, dir, sizeof(tmp));
82 strlcat(tmp, "/.AppleDB", sizeof(tmp));
83 if (stat(tmp, &st1) < 0) /* use .AppleDB owner, if folder already exists */
85 LOG(log_info, logtype_cnid, "Setting uid/gid to %d/%d", st1.st_uid, st1.st_gid);
86 if (setegid(st1.st_gid) < 0 || seteuid(st1.st_uid) < 0) {
87 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
94 /* Opens CNID database using particular back-end */
95 struct _cnid_db *cnid_open(const char *volpath, mode_t mask, char *type, int flags)
98 cnid_module *mod = NULL;
99 struct list_head *ptr;
103 list_for_each(ptr, &modules) {
104 if (0 == strcmp(list_entry(ptr, cnid_module, db_list)->name, type)) {
105 mod = list_entry(ptr, cnid_module, db_list);
111 LOG(log_error, logtype_afpd, "Cannot find module named [%s] in registered module list!", type);
115 if ((mod->flags & CNID_FLAG_SETUID) && !(flags & CNID_FLAG_MEMORY)) {
119 LOG(log_error, logtype_afpd, "seteuid failed %s", strerror(errno));
122 if (cnid_dir(volpath, mask) < 0) {
123 if ( setegid(gid) < 0 || seteuid(uid) < 0) {
124 LOG(log_error, logtype_afpd, "can't seteuid back %s", strerror(errno));
131 db = mod->cnid_open(volpath, mask, flags);
133 if ((mod->flags & CNID_FLAG_SETUID) && !(flags & CNID_FLAG_MEMORY)) {
135 if ( setegid(gid) < 0 || seteuid(uid) < 0) {
136 LOG(log_error, logtype_afpd, "can't seteuid back %s", strerror(errno));
142 LOG(log_error, logtype_afpd, "Cannot open CNID db at [%s].", volpath);
145 /* FIXME should module know about it ? */
146 if ((flags & CNID_FLAG_NODEV)) {
147 db->flags |= CNID_FLAG_NODEV;
149 db->flags |= mod->flags;
151 if ((db->flags & CNID_FLAG_BLOCK)) {
152 sigemptyset(&sigblockset);
153 sigaddset(&sigblockset, SIGTERM);
154 sigaddset(&sigblockset, SIGHUP);
155 sigaddset(&sigblockset, SIGUSR1);
156 sigaddset(&sigblockset, SIGUSR2);
157 sigaddset(&sigblockset, SIGALRM);
163 /* ------------------- */
164 static void block_signal( u_int32_t flags)
166 if ((flags & CNID_FLAG_BLOCK)) {
167 sigprocmask(SIG_BLOCK, &sigblockset, NULL);
171 /* ------------------- */
172 static void unblock_signal(u_int32_t flags)
174 if ((flags & CNID_FLAG_BLOCK)) {
175 sigprocmask(SIG_UNBLOCK, &sigblockset, NULL);
179 /* -------------------
180 protect against bogus value from the DB.
181 adddir really doesn't like 2
183 static cnid_t valide(cnid_t id)
185 if (id < CNID_START) {
189 LOG(log_error, logtype_afpd, "Error: Invalid cnid, corrupted DB?");
196 /* Closes CNID database. Currently it's just a wrapper around db->cnid_close(). */
197 void cnid_close(struct _cnid_db *db)
202 LOG(log_error, logtype_afpd, "Error: cnid_close called with NULL argument !");
205 /* cnid_close free db */
209 unblock_signal(flags);
212 /* --------------- */
213 cnid_t cnid_add(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
214 char *name, const size_t len, cnid_t hint)
218 block_signal(cdb->flags);
219 ret = valide(cdb->cnid_add(cdb, st, did, name, len, hint));
220 unblock_signal(cdb->flags);
224 /* --------------- */
225 int cnid_delete(struct _cnid_db *cdb, cnid_t id)
229 block_signal(cdb->flags);
230 ret = cdb->cnid_delete(cdb, id);
231 unblock_signal(cdb->flags);
236 /* --------------- */
237 cnid_t cnid_get(struct _cnid_db *cdb, const cnid_t did, char *name,const size_t len)
241 block_signal(cdb->flags);
242 ret = valide(cdb->cnid_get(cdb, did, name, len));
243 unblock_signal(cdb->flags);
247 /* --------------- */
248 int cnid_getstamp(struct _cnid_db *cdb, void *buffer, const size_t len)
253 if (!cdb->cnid_getstamp) {
254 memset(buffer, 0, len);
255 /* return the current time. it will invalide cache */
256 if (len < sizeof(time_t))
259 memcpy(buffer, &t, sizeof(time_t));
262 block_signal(cdb->flags);
263 ret = cdb->cnid_getstamp(cdb, buffer, len);
264 unblock_signal(cdb->flags);
268 /* --------------- */
269 cnid_t cnid_lookup(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
270 char *name, const size_t len)
274 block_signal(cdb->flags);
275 ret = valide(cdb->cnid_lookup(cdb, st, did, name, len));
276 unblock_signal(cdb->flags);
280 /* --------------- */
281 char *cnid_resolve(struct _cnid_db *cdb, cnid_t *id, void *buffer, size_t len)
285 block_signal(cdb->flags);
286 ret = cdb->cnid_resolve(cdb, id, buffer, len);
287 unblock_signal(cdb->flags);
288 if (ret && !strcmp(ret, "..")) {
289 LOG(log_error, logtype_afpd, "cnid_resolve: name is '..', corrupted db? ");
295 /* --------------- */
296 int cnid_update (struct _cnid_db *cdb, const cnid_t id, const struct stat *st,
297 const cnid_t did, char *name, const size_t len)
301 block_signal(cdb->flags);
302 ret = cdb->cnid_update(cdb, id, st, did, name, len);
303 unblock_signal(cdb->flags);
307 /* --------------- */
308 cnid_t cnid_rebuild_add(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
309 char *name, const size_t len, cnid_t hint)
313 block_signal(cdb->flags);
314 ret = cdb->cnid_rebuild_add(cdb, st, did, name, len, hint);
315 unblock_signal(cdb->flags);