2 Unix SMB/CIFS implementation.
3 connection claim routines
4 Copyright (C) Andrew Tridgell 1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 static TDB_CONTEXT *tdb;
25 /****************************************************************************
26 Return the connection tdb context (used for message send all).
27 ****************************************************************************/
29 TDB_CONTEXT *conn_tdb_ctx(void)
32 tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
33 O_RDWR | O_CREAT, 0644);
38 static void make_conn_key(connection_struct *conn, const char *name, TDB_DATA *pkbuf, struct connections_key *pkey)
41 pkey->pid = procid_self();
42 pkey->cnum = conn?conn->cnum:-1;
43 fstrcpy(pkey->name, name);
45 /* valgrind fixer... */
47 size_t sl = strlen(pkey->name);
48 if (sizeof(fstring)-sl)
49 memset(&pkey->name[sl], '\0', sizeof(fstring)-sl);
53 pkbuf->dptr = (uint8 *)pkey;
54 pkbuf->dsize = sizeof(*pkey);
57 /****************************************************************************
58 Delete a connection record.
59 ****************************************************************************/
61 BOOL yield_connection(connection_struct *conn, const char *name)
63 struct connections_key key;
69 DEBUG(3,("Yielding connection to %s\n",name));
71 make_conn_key(conn, name, &kbuf, &key);
73 if (tdb_delete(tdb, kbuf) != 0) {
74 int dbg_lvl = (!conn && (tdb_error(tdb) == TDB_ERR_NOEXIST)) ? 3 : 0;
75 DEBUG(dbg_lvl,("yield_connection: tdb_delete for name %s failed with error %s.\n",
76 name, tdb_errorstr(tdb) ));
90 /****************************************************************************
91 Count the entries belonging to a service in the connection db.
92 ****************************************************************************/
94 static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
96 struct connections_data crec;
97 struct count_stat *cs = (struct count_stat *)udp;
99 if (dbuf.dsize != sizeof(crec)) {
103 memcpy(&crec, dbuf.dptr, sizeof(crec));
105 if (crec.cnum == -1) {
109 /* If the pid was not found delete the entry from connections.tdb */
111 if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
112 DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
113 procid_str_static(&crec.pid), crec.cnum, crec.servicename));
114 if (tdb_delete(the_tdb, kbuf) != 0)
115 DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(tdb) ));
120 /* We are counting all the connections to a given share. */
121 if (strequal(crec.servicename, cs->name)) {
122 cs->curr_connections++;
125 /* We are counting all the connections. Static registrations
126 * like the lpq backgroud process and the smbd daemon process
127 * have a cnum of -1, so won't be counted here.
129 cs->curr_connections++;
135 /****************************************************************************
136 Claim an entry in the connections database.
137 ****************************************************************************/
139 int count_current_connections( const char *sharename, BOOL clear )
141 struct count_stat cs;
143 cs.mypid = sys_getpid();
144 cs.curr_connections = 0;
149 * This has a race condition, but locking the chain before hand is worse
150 * as it leads to deadlock.
153 if (tdb_traverse(tdb, count_fn, &cs) == -1) {
154 DEBUG(0,("count_current_connections: traverse of connections.tdb failed with error %s\n",
155 tdb_errorstr(tdb) ));
156 DEBUGADD(0, ("count_current_connections: connection count of %d might not be accurate",
157 cs.curr_connections));
160 /* If the traverse failed part-way through, we at least return
161 * as many connections as we had already counted. If it failed
162 * right at the start, we will return 0, which is about all we
166 return cs.curr_connections;
169 /****************************************************************************
170 Count the number of connections open across all shares.
171 ****************************************************************************/
173 int count_all_current_connections(void)
175 return count_current_connections(NULL, True /* clear stale entries */);
178 /****************************************************************************
179 Claim an entry in the connections database.
180 ****************************************************************************/
182 BOOL claim_connection(connection_struct *conn, const char *name,int max_connections,BOOL Clear, uint32 msg_flags)
184 struct connections_key key;
185 struct connections_data crec;
189 if ( (tdb =conn_tdb_ctx()) == NULL ) {
195 * Enforce the max connections parameter.
198 if (max_connections > 0) {
199 int curr_connections;
201 curr_connections = count_current_connections( lp_servicename(SNUM(conn)), True );
203 if (curr_connections >= max_connections) {
204 DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
205 max_connections, name ));
210 DEBUG(5,("claiming %s %d\n",name,max_connections));
212 make_conn_key(conn, name, &kbuf, &key);
214 /* fill in the crec */
216 crec.magic = 0x280267;
217 crec.pid = procid_self();
218 crec.cnum = conn?conn->cnum:-1;
220 crec.uid = conn->uid;
221 crec.gid = conn->gid;
222 safe_strcpy(crec.servicename,
223 lp_servicename(SNUM(conn)),sizeof(crec.servicename)-1);
225 crec.start = time(NULL);
226 crec.bcast_msg_flags = msg_flags;
228 safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
229 safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
231 dbuf.dptr = (uint8 *)&crec;
232 dbuf.dsize = sizeof(crec);
234 if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
235 DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
236 tdb_errorstr(tdb) ));
243 BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
245 struct connections_key key;
246 struct connections_data *pcrec;
252 DEBUG(10,("register_message_flags: %s flags 0x%x\n",
253 doreg ? "adding" : "removing",
254 (unsigned int)msg_flags ));
256 make_conn_key(NULL, "", &kbuf, &key);
258 dbuf = tdb_fetch(tdb, kbuf);
260 DEBUG(0,("register_message_flags: tdb_fetch failed: %s\n",
265 pcrec = (struct connections_data *)dbuf.dptr;
267 pcrec->bcast_msg_flags |= msg_flags;
269 pcrec->bcast_msg_flags &= ~msg_flags;
271 if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
272 DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
273 tdb_errorstr(tdb) ));
274 SAFE_FREE(dbuf.dptr);
278 DEBUG(10,("register_message_flags: new flags 0x%x\n",
279 (unsigned int)pcrec->bcast_msg_flags ));
281 SAFE_FREE(dbuf.dptr);
285 /*********************************************************************
286 *********************************************************************/
288 static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
290 TDB_DATA *kbuf = NULL;
296 if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
300 snprintf( key_string, sizeof(key_string), "%s/%d/%d",
301 prec->name, procid_to_pid(&prec->pid), prec->pnum );
303 *kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
304 if (kbuf->dptr == NULL )
310 /*********************************************************************
311 *********************************************************************/
313 static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
315 prec->pid = pid_to_procid(sys_getpid());
316 prec->pnum = p->pnum;
317 prec->uid = geteuid();
318 fstrcpy( prec->name, p->name );
323 /*********************************************************************
324 *********************************************************************/
326 BOOL store_pipe_opendb( smb_np_struct *p )
328 struct pipe_open_rec *prec;
331 TDB_CONTEXT *pipe_tdb;
334 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
335 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
339 fill_pipe_open_rec( prec, p );
340 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
344 data.dptr = (uint8 *)prec;
345 data.dsize = sizeof(struct pipe_open_rec);
347 if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
351 ret = (tdb_store( pipe_tdb, *key, data, TDB_REPLACE ) != -1);
358 /*********************************************************************
359 *********************************************************************/
361 BOOL delete_pipe_opendb( smb_np_struct *p )
363 struct pipe_open_rec *prec;
365 TDB_CONTEXT *pipe_tdb;
368 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
369 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
373 fill_pipe_open_rec( prec, p );
374 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
378 if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
382 ret = (tdb_delete( pipe_tdb, *key ) != -1 );