r23432: Remove superfluous comment.
[Samba/bb.git] / source3 / smbd / connection.c
blob211f0e6acba8208764d342aca4277232779960bc
1 /*
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.
21 #include "includes.h"
23 /****************************************************************************
24 Delete a connection record.
25 ****************************************************************************/
27 BOOL yield_connection(connection_struct *conn, const char *name)
29 struct db_record *rec;
30 NTSTATUS status;
32 DEBUG(3,("Yielding connection to %s\n",name));
34 if (!(rec = connections_fetch_entry(NULL, conn, name))) {
35 DEBUG(0, ("connections_fetch_entry failed\n"));
36 return False;
39 status = rec->delete_rec(rec);
40 if (!NT_STATUS_IS_OK(status)) {
41 DEBUG( NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) ? 3 : 0,
42 ("deleting connection record returned %s\n",
43 nt_errstr(status)));
46 TALLOC_FREE(rec);
47 return NT_STATUS_IS_OK(status);
50 struct count_stat {
51 pid_t mypid;
52 int curr_connections;
53 const char *name;
54 BOOL Clear;
57 /****************************************************************************
58 Count the entries belonging to a service in the connection db.
59 ****************************************************************************/
61 static int count_fn(struct db_record *rec,
62 const struct connections_key *ckey,
63 const struct connections_data *crec,
64 void *udp)
66 struct count_stat *cs = (struct count_stat *)udp;
68 if (crec->cnum == -1) {
69 return 0;
72 /* If the pid was not found delete the entry from connections.tdb */
74 if (cs->Clear && !process_exists(crec->pid) && (errno == ESRCH)) {
75 NTSTATUS status;
76 DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
77 procid_str_static(&crec->pid), crec->cnum,
78 crec->servicename));
80 status = rec->delete_rec(rec);
81 if (!NT_STATUS_IS_OK(status)) {
82 DEBUG(0,("count_fn: tdb_delete failed with error %s\n",
83 nt_errstr(status)));
85 return 0;
88 if (cs->name) {
89 /* We are counting all the connections to a given share. */
90 if (strequal(crec->servicename, cs->name)) {
91 cs->curr_connections++;
93 } else {
94 /* We are counting all the connections. Static registrations
95 * like the lpq backgroud process and the smbd daemon process
96 * have a cnum of -1, so won't be counted here.
98 cs->curr_connections++;
101 return 0;
104 /****************************************************************************
105 Claim an entry in the connections database.
106 ****************************************************************************/
108 int count_current_connections( const char *sharename, BOOL clear )
110 struct count_stat cs;
112 cs.mypid = sys_getpid();
113 cs.curr_connections = 0;
114 cs.name = sharename;
115 cs.Clear = clear;
118 * This has a race condition, but locking the chain before hand is worse
119 * as it leads to deadlock.
122 if (connections_forall(count_fn, &cs) == -1) {
123 DEBUG(0,("count_current_connections: traverse of "
124 "connections.tdb failed\n"));
125 DEBUGADD(0, ("count_current_connections: connection count of %d might not be accurate",
126 cs.curr_connections));
129 /* If the traverse failed part-way through, we at least return
130 * as many connections as we had already counted. If it failed
131 * right at the start, we will return 0, which is about all we
132 * can do anywway.
135 return cs.curr_connections;
138 /****************************************************************************
139 Count the number of connections open across all shares.
140 ****************************************************************************/
142 int count_all_current_connections(void)
144 return count_current_connections(NULL, True /* clear stale entries */);
147 /****************************************************************************
148 Claim an entry in the connections database.
149 ****************************************************************************/
151 BOOL claim_connection(connection_struct *conn, const char *name,
152 uint32 msg_flags)
154 struct db_record *rec;
155 struct connections_data crec;
156 TDB_DATA dbuf;
157 NTSTATUS status;
159 DEBUG(5,("claiming [%s]\n", name));
161 if (!(rec = connections_fetch_entry(NULL, conn, name))) {
162 DEBUG(0, ("connections_fetch_entry failed\n"));
163 return False;
166 /* fill in the crec */
167 ZERO_STRUCT(crec);
168 crec.magic = 0x280267;
169 crec.pid = procid_self();
170 crec.cnum = conn?conn->cnum:-1;
171 if (conn) {
172 crec.uid = conn->uid;
173 crec.gid = conn->gid;
174 strlcpy(crec.servicename, lp_servicename(SNUM(conn)),
175 sizeof(crec.servicename));
177 crec.start = time(NULL);
178 crec.bcast_msg_flags = msg_flags;
180 strlcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine));
181 strlcpy(crec.addr,conn?conn->client_address:client_addr(),
182 sizeof(crec.addr));
184 dbuf.dptr = (uint8 *)&crec;
185 dbuf.dsize = sizeof(crec);
187 status = rec->store(rec, dbuf, TDB_REPLACE);
189 TALLOC_FREE(rec);
191 if (!NT_STATUS_IS_OK(status)) {
192 DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
193 nt_errstr(status)));
194 return False;
197 return True;
200 BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
202 struct db_record *rec;
203 struct connections_data *pcrec;
204 NTSTATUS status;
206 DEBUG(10,("register_message_flags: %s flags 0x%x\n",
207 doreg ? "adding" : "removing",
208 (unsigned int)msg_flags ));
210 if (!(rec = connections_fetch_entry(NULL, NULL, NULL))) {
211 DEBUG(0, ("connections_fetch_entry failed\n"));
212 return False;
215 if (rec->value.dsize != sizeof(struct connections_data)) {
216 DEBUG(0,("register_message_flags: Got wrong record size\n"));
217 TALLOC_FREE(rec);
218 return False;
221 pcrec = (struct connections_data *)rec->value.dptr;
222 if (doreg)
223 pcrec->bcast_msg_flags |= msg_flags;
224 else
225 pcrec->bcast_msg_flags &= ~msg_flags;
227 status = rec->store(rec, rec->value, TDB_REPLACE);
229 TALLOC_FREE(rec);
231 if (!NT_STATUS_IS_OK(status)) {
232 DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
233 nt_errstr(status)));
234 return False;
237 DEBUG(10,("register_message_flags: new flags 0x%x\n",
238 (unsigned int)pcrec->bcast_msg_flags ));
240 return True;
243 /*********************************************************************
244 *********************************************************************/
246 static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
248 TDB_DATA *kbuf = NULL;
249 fstring key_string;
251 if ( !prec )
252 return NULL;
254 if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
255 return NULL;
258 snprintf( key_string, sizeof(key_string), "%s/%d/%d",
259 prec->name, procid_to_pid(&prec->pid), prec->pnum );
261 *kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
262 if (kbuf->dptr == NULL )
263 return NULL;
265 return kbuf;
268 /*********************************************************************
269 *********************************************************************/
271 static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
273 prec->pid = pid_to_procid(sys_getpid());
274 prec->pnum = p->pnum;
275 prec->uid = geteuid();
276 fstrcpy( prec->name, p->name );
278 return;
281 /*********************************************************************
282 *********************************************************************/
284 BOOL store_pipe_opendb( smb_np_struct *p )
286 struct db_record *dbrec;
287 struct pipe_open_rec *prec;
288 TDB_DATA *key;
289 TDB_DATA data;
290 BOOL ret = False;
292 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
293 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
294 return False;
297 fill_pipe_open_rec( prec, p );
298 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
299 goto done;
302 data.dptr = (uint8 *)prec;
303 data.dsize = sizeof(struct pipe_open_rec);
305 if (!(dbrec = connections_fetch_record(prec, *key))) {
306 DEBUG(0, ("connections_fetch_record failed\n"));
307 goto done;
310 ret = NT_STATUS_IS_OK(dbrec->store(dbrec, data, TDB_REPLACE));
312 done:
313 TALLOC_FREE( prec );
314 return ret;
317 /*********************************************************************
318 *********************************************************************/
320 BOOL delete_pipe_opendb( smb_np_struct *p )
322 struct db_record *dbrec;
323 struct pipe_open_rec *prec;
324 TDB_DATA *key;
325 BOOL ret = False;
327 if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
328 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
329 return False;
332 fill_pipe_open_rec( prec, p );
333 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
334 goto done;
337 if (!(dbrec = connections_fetch_record(prec, *key))) {
338 DEBUG(0, ("connections_fetch_record failed\n"));
339 goto done;
342 ret = NT_STATUS_IS_OK(dbrec->delete_rec(dbrec));
344 done:
345 TALLOC_FREE( prec );
346 return ret;