2 * $Id: cnid.c,v 1.13 2010-03-31 09:47:32 franklahm 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,
96 const char *cnidsrv, const char *cnidport)
99 cnid_module *mod = NULL;
100 struct list_head *ptr;
104 list_for_each(ptr, &modules) {
105 if (0 == strcmp(list_entry(ptr, cnid_module, db_list)->name, type)) {
106 mod = list_entry(ptr, cnid_module, db_list);
112 LOG(log_error, logtype_afpd, "Cannot find module named [%s] in registered module list!", type);
116 if ((mod->flags & CNID_FLAG_SETUID) && !(flags & CNID_FLAG_MEMORY)) {
120 LOG(log_error, logtype_afpd, "seteuid failed %s", strerror(errno));
123 if (cnid_dir(volpath, mask) < 0) {
124 if ( setegid(gid) < 0 || seteuid(uid) < 0) {
125 LOG(log_error, logtype_afpd, "can't seteuid back %s", strerror(errno));
132 struct cnid_open_args args = {volpath, mask, flags, cnidsrv, cnidport};
133 db = mod->cnid_open(&args);
135 if ((mod->flags & CNID_FLAG_SETUID) && !(flags & CNID_FLAG_MEMORY)) {
137 if ( setegid(gid) < 0 || seteuid(uid) < 0) {
138 LOG(log_error, logtype_afpd, "can't seteuid back %s", strerror(errno));
144 LOG(log_error, logtype_afpd, "Cannot open CNID db at [%s].", volpath);
147 /* FIXME should module know about it ? */
148 if ((flags & CNID_FLAG_NODEV)) {
149 db->flags |= CNID_FLAG_NODEV;
151 db->flags |= mod->flags;
153 if ((db->flags & CNID_FLAG_BLOCK)) {
154 sigemptyset(&sigblockset);
155 sigaddset(&sigblockset, SIGTERM);
156 sigaddset(&sigblockset, SIGHUP);
157 sigaddset(&sigblockset, SIGUSR1);
158 sigaddset(&sigblockset, SIGUSR2);
159 sigaddset(&sigblockset, SIGALRM);
165 /* ------------------- */
166 static void block_signal( u_int32_t flags)
168 if ((flags & CNID_FLAG_BLOCK)) {
169 pthread_sigmask(SIG_BLOCK, &sigblockset, NULL);
173 /* ------------------- */
174 static void unblock_signal(u_int32_t flags)
176 if ((flags & CNID_FLAG_BLOCK)) {
177 pthread_sigmask(SIG_UNBLOCK, &sigblockset, NULL);
181 /* -------------------
182 protect against bogus value from the DB.
183 adddir really doesn't like 2
185 static cnid_t valide(cnid_t id)
187 if (id == CNID_INVALID)
190 if (id < CNID_START) {
194 LOG(log_error, logtype_afpd, "Error: Invalid cnid, corrupted DB?");
201 /* Closes CNID database. Currently it's just a wrapper around db->cnid_close(). */
202 void cnid_close(struct _cnid_db *db)
207 LOG(log_error, logtype_afpd, "Error: cnid_close called with NULL argument !");
210 /* cnid_close free db */
214 unblock_signal(flags);
217 /* --------------- */
218 cnid_t cnid_add(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
219 char *name, const size_t len, cnid_t hint)
223 block_signal(cdb->flags);
224 ret = valide(cdb->cnid_add(cdb, st, did, name, len, hint));
225 unblock_signal(cdb->flags);
229 /* --------------- */
230 int cnid_delete(struct _cnid_db *cdb, cnid_t id)
234 block_signal(cdb->flags);
235 ret = cdb->cnid_delete(cdb, id);
236 unblock_signal(cdb->flags);
241 /* --------------- */
242 cnid_t cnid_get(struct _cnid_db *cdb, const cnid_t did, char *name,const size_t len)
246 block_signal(cdb->flags);
247 ret = valide(cdb->cnid_get(cdb, did, name, len));
248 unblock_signal(cdb->flags);
252 /* --------------- */
253 int cnid_getstamp(struct _cnid_db *cdb, void *buffer, const size_t len)
258 if (!cdb->cnid_getstamp) {
259 memset(buffer, 0, len);
260 /* return the current time. it will invalide cache */
261 if (len < sizeof(time_t))
264 memcpy(buffer, &t, sizeof(time_t));
267 block_signal(cdb->flags);
268 ret = cdb->cnid_getstamp(cdb, buffer, len);
269 unblock_signal(cdb->flags);
273 /* --------------- */
274 cnid_t cnid_lookup(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
275 char *name, const size_t len)
279 block_signal(cdb->flags);
280 ret = valide(cdb->cnid_lookup(cdb, st, did, name, len));
281 unblock_signal(cdb->flags);
285 /* --------------- */
286 char *cnid_resolve(struct _cnid_db *cdb, cnid_t *id, void *buffer, size_t len)
290 block_signal(cdb->flags);
291 ret = cdb->cnid_resolve(cdb, id, buffer, len);
292 unblock_signal(cdb->flags);
293 if (ret && !strcmp(ret, "..")) {
294 LOG(log_error, logtype_afpd, "cnid_resolve: name is '..', corrupted db? ");
300 /* --------------- */
301 int cnid_update (struct _cnid_db *cdb, const cnid_t id, const struct stat *st,
302 const cnid_t did, char *name, const size_t len)
306 block_signal(cdb->flags);
307 ret = cdb->cnid_update(cdb, id, st, did, name, len);
308 unblock_signal(cdb->flags);
312 /* --------------- */
313 cnid_t cnid_rebuild_add(struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
314 char *name, const size_t len, cnid_t hint)
318 block_signal(cdb->flags);
319 ret = cdb->cnid_rebuild_add(cdb, st, did, name, len, hint);
320 unblock_signal(cdb->flags);