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 = (char *)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))
102 memcpy(&crec, dbuf.dptr, sizeof(crec));
107 /* If the pid was not found delete the entry from connections.tdb */
109 if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
110 DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
111 procid_str_static(&crec.pid), crec.cnum, crec.name));
112 if (tdb_delete(the_tdb, kbuf) != 0)
113 DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(tdb) ));
117 if (strequal(crec.name, cs->name))
118 cs->curr_connections++;
123 /****************************************************************************
124 Claim an entry in the connections database.
125 ****************************************************************************/
127 int count_current_connections( const char *sharename, BOOL clear )
129 struct count_stat cs;
131 cs.mypid = sys_getpid();
132 cs.curr_connections = 0;
137 * This has a race condition, but locking the chain before hand is worse
138 * as it leads to deadlock.
141 if (tdb_traverse(tdb, count_fn, &cs) == -1) {
142 DEBUG(0,("claim_connection: traverse of connections.tdb failed with error %s.\n",
143 tdb_errorstr(tdb) ));
147 return cs.curr_connections;
150 /****************************************************************************
151 Claim an entry in the connections database.
152 ****************************************************************************/
154 BOOL claim_connection(connection_struct *conn, const char *name,int max_connections,BOOL Clear, uint32 msg_flags)
156 struct connections_key key;
157 struct connections_data crec;
161 if ( (tdb =conn_tdb_ctx()) == NULL ) {
167 * Enforce the max connections parameter.
170 if (max_connections > 0) {
171 int curr_connections;
173 curr_connections = count_current_connections( lp_servicename(SNUM(conn)), True );
175 if (curr_connections >= max_connections) {
176 DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
177 max_connections, name ));
182 DEBUG(5,("claiming %s %d\n",name,max_connections));
184 make_conn_key(conn, name, &kbuf, &key);
186 /* fill in the crec */
188 crec.magic = 0x280267;
189 crec.pid = procid_self();
190 crec.cnum = conn?conn->cnum:-1;
192 crec.uid = conn->uid;
193 crec.gid = conn->gid;
194 safe_strcpy(crec.name,
195 lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
197 crec.start = time(NULL);
198 crec.bcast_msg_flags = msg_flags;
200 safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
201 safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
203 dbuf.dptr = (char *)&crec;
204 dbuf.dsize = sizeof(crec);
206 if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
207 DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
208 tdb_errorstr(tdb) ));
215 BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
217 struct connections_key key;
218 struct connections_data *pcrec;
224 DEBUG(10,("register_message_flags: %s flags 0x%x\n",
225 doreg ? "adding" : "removing",
226 (unsigned int)msg_flags ));
228 make_conn_key(NULL, "", &kbuf, &key);
230 dbuf = tdb_fetch(tdb, kbuf);
232 DEBUG(0,("register_message_flags: tdb_fetch failed: %s\n",
237 pcrec = (struct connections_data *)dbuf.dptr;
239 pcrec->bcast_msg_flags |= msg_flags;
241 pcrec->bcast_msg_flags &= ~msg_flags;
243 if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
244 DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
245 tdb_errorstr(tdb) ));
246 SAFE_FREE(dbuf.dptr);
250 DEBUG(10,("register_message_flags: new flags 0x%x\n",
251 (unsigned int)pcrec->bcast_msg_flags ));
253 SAFE_FREE(dbuf.dptr);
257 /*********************************************************************
258 *********************************************************************/
260 static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
262 TDB_DATA *kbuf = NULL;
268 if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
272 snprintf( key_string, sizeof(key_string), "%s/%d/%d",
273 prec->name, procid_to_pid(&prec->pid), prec->pnum );
275 *kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
276 if (kbuf->dptr == NULL )
282 /*********************************************************************
283 *********************************************************************/
285 static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
287 prec->pid = pid_to_procid(sys_getpid());
288 prec->pnum = p->pnum;
289 prec->uid = geteuid();
290 fstrcpy( prec->name, p->name );
295 /*********************************************************************
296 *********************************************************************/
298 BOOL store_pipe_opendb( smb_np_struct *p )
300 struct pipe_open_rec *prec;
303 TDB_CONTEXT *pipe_tdb;
306 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
307 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
311 fill_pipe_open_rec( prec, p );
312 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
316 data.dptr = (char*)prec;
317 data.dsize = sizeof(struct pipe_open_rec);
319 if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
323 ret = (tdb_store( pipe_tdb, *key, data, TDB_REPLACE ) != -1);
330 /*********************************************************************
331 *********************************************************************/
333 BOOL delete_pipe_opendb( smb_np_struct *p )
335 struct pipe_open_rec *prec;
337 TDB_CONTEXT *pipe_tdb;
340 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
341 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
345 fill_pipe_open_rec( prec, p );
346 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
350 if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
354 ret = (tdb_delete( pipe_tdb, *key ) != -1 );