source: branches/samba-3.3.x/source/smbd/connection.c@ 206

Last change on this file since 206 was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 8.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 connection claim routines
4 Copyright (C) Andrew Tridgell 1998
5
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 3 of the License, or
9 (at your option) any later version.
10
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.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21
22/****************************************************************************
23 Delete a connection record.
24****************************************************************************/
25
26bool yield_connection(connection_struct *conn, const char *name)
27{
28 struct db_record *rec;
29 NTSTATUS status;
30
31 DEBUG(3,("Yielding connection to %s\n",name));
32
33 if (!(rec = connections_fetch_entry(NULL, conn, name))) {
34 DEBUG(0, ("connections_fetch_entry failed\n"));
35 return False;
36 }
37
38 status = rec->delete_rec(rec);
39 if (!NT_STATUS_IS_OK(status)) {
40 DEBUG( NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) ? 3 : 0,
41 ("deleting connection record returned %s\n",
42 nt_errstr(status)));
43 }
44
45 TALLOC_FREE(rec);
46 return NT_STATUS_IS_OK(status);
47}
48
49struct count_stat {
50 pid_t mypid;
51 int curr_connections;
52 const char *name;
53 bool Clear;
54};
55
56/****************************************************************************
57 Count the entries belonging to a service in the connection db.
58****************************************************************************/
59
60static int count_fn(struct db_record *rec,
61 const struct connections_key *ckey,
62 const struct connections_data *crec,
63 void *udp)
64{
65 struct count_stat *cs = (struct count_stat *)udp;
66
67 if (crec->cnum == -1) {
68 return 0;
69 }
70
71 /* If the pid was not found delete the entry from connections.tdb */
72
73 if (cs->Clear && !process_exists(crec->pid) && (errno == ESRCH)) {
74 NTSTATUS status;
75 DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
76 procid_str_static(&crec->pid), crec->cnum,
77 crec->servicename));
78
79 status = rec->delete_rec(rec);
80 if (!NT_STATUS_IS_OK(status)) {
81 DEBUG(0,("count_fn: tdb_delete failed with error %s\n",
82 nt_errstr(status)));
83 }
84 return 0;
85 }
86
87 if (strequal(crec->servicename, cs->name))
88 cs->curr_connections++;
89
90 return 0;
91}
92
93/****************************************************************************
94 Claim an entry in the connections database.
95****************************************************************************/
96
97int count_current_connections( const char *sharename, bool clear )
98{
99 struct count_stat cs;
100
101 cs.mypid = sys_getpid();
102 cs.curr_connections = 0;
103 cs.name = sharename;
104 cs.Clear = clear;
105
106 /*
107 * This has a race condition, but locking the chain before hand is worse
108 * as it leads to deadlock.
109 */
110
111 if (connections_forall(count_fn, &cs) == -1) {
112 DEBUG(0,("count_current_connections: traverse of "
113 "connections.tdb failed\n"));
114 return False;
115 }
116
117 return cs.curr_connections;
118}
119
120/****************************************************************************
121 Count the number of connections open across all shares.
122****************************************************************************/
123
124int count_all_current_connections(void)
125{
126 return count_current_connections(NULL, True /* clear stale entries */);
127}
128
129/****************************************************************************
130 Claim an entry in the connections database.
131****************************************************************************/
132
133bool claim_connection(connection_struct *conn, const char *name,
134 uint32 msg_flags)
135{
136 struct db_record *rec;
137 struct connections_data crec;
138 TDB_DATA dbuf;
139 NTSTATUS status;
140 char addr[INET6_ADDRSTRLEN];
141
142 DEBUG(5,("claiming [%s]\n", name));
143
144 if (!(rec = connections_fetch_entry(talloc_tos(), conn, name))) {
145 DEBUG(0, ("connections_fetch_entry failed\n"));
146 return False;
147 }
148
149 /* fill in the crec */
150 ZERO_STRUCT(crec);
151 crec.magic = 0x280267;
152 crec.pid = procid_self();
153 crec.cnum = conn?conn->cnum:-1;
154 if (conn) {
155 crec.uid = conn->server_info->utok.uid;
156 crec.gid = conn->server_info->utok.gid;
157 strlcpy(crec.servicename, lp_servicename(SNUM(conn)),
158 sizeof(crec.servicename));
159 }
160 crec.start = time(NULL);
161 crec.bcast_msg_flags = msg_flags;
162
163 strlcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine));
164 strlcpy(crec.addr,conn?conn->client_address:
165 client_addr(get_client_fd(),addr,sizeof(addr)),
166 sizeof(crec.addr));
167
168 dbuf.dptr = (uint8 *)&crec;
169 dbuf.dsize = sizeof(crec);
170
171 status = rec->store(rec, dbuf, TDB_REPLACE);
172
173 TALLOC_FREE(rec);
174
175 if (!NT_STATUS_IS_OK(status)) {
176 DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
177 nt_errstr(status)));
178 return False;
179 }
180
181 return True;
182}
183
184bool register_message_flags(bool doreg, uint32 msg_flags)
185{
186 struct db_record *rec;
187 struct connections_data *pcrec;
188 NTSTATUS status;
189
190 DEBUG(10,("register_message_flags: %s flags 0x%x\n",
191 doreg ? "adding" : "removing",
192 (unsigned int)msg_flags ));
193
194 if (!(rec = connections_fetch_entry(NULL, NULL, ""))) {
195 DEBUG(0, ("connections_fetch_entry failed\n"));
196 return False;
197 }
198
199 if (rec->value.dsize != sizeof(struct connections_data)) {
200 DEBUG(0,("register_message_flags: Got wrong record size\n"));
201 TALLOC_FREE(rec);
202 return False;
203 }
204
205 pcrec = (struct connections_data *)rec->value.dptr;
206 if (doreg)
207 pcrec->bcast_msg_flags |= msg_flags;
208 else
209 pcrec->bcast_msg_flags &= ~msg_flags;
210
211 status = rec->store(rec, rec->value, TDB_REPLACE);
212
213 if (!NT_STATUS_IS_OK(status)) {
214 DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
215 nt_errstr(status)));
216 TALLOC_FREE(rec);
217 return False;
218 }
219
220 DEBUG(10,("register_message_flags: new flags 0x%x\n",
221 (unsigned int)pcrec->bcast_msg_flags ));
222
223 TALLOC_FREE(rec);
224
225 return True;
226}
227
228/*********************************************************************
229*********************************************************************/
230
231static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
232{
233 TDB_DATA *kbuf = NULL;
234 fstring key_string;
235
236 if ( !prec )
237 return NULL;
238
239 if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
240 return NULL;
241 }
242
243 snprintf( key_string, sizeof(key_string), "%s/%d/%d",
244 prec->name, procid_to_pid(&prec->pid), prec->pnum );
245
246 *kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
247 if (kbuf->dptr == NULL )
248 return NULL;
249
250 return kbuf;
251}
252
253/*********************************************************************
254*********************************************************************/
255
256static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
257{
258 prec->pid = pid_to_procid(sys_getpid());
259 prec->pnum = p->pnum;
260 prec->uid = geteuid();
261 fstrcpy( prec->name, p->name );
262
263 return;
264}
265
266/*********************************************************************
267*********************************************************************/
268
269bool store_pipe_opendb( smb_np_struct *p )
270{
271 struct db_record *dbrec;
272 struct pipe_open_rec *prec;
273 TDB_DATA *key;
274 TDB_DATA data;
275 bool ret = False;
276
277 if ( (prec = TALLOC_P( talloc_tos(), struct pipe_open_rec)) == NULL ) {
278 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
279 return False;
280 }
281
282 fill_pipe_open_rec( prec, p );
283 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
284 goto done;
285 }
286
287 data.dptr = (uint8 *)prec;
288 data.dsize = sizeof(struct pipe_open_rec);
289
290 if (!(dbrec = connections_fetch_record(prec, *key))) {
291 DEBUG(0, ("connections_fetch_record failed\n"));
292 goto done;
293 }
294
295 ret = NT_STATUS_IS_OK(dbrec->store(dbrec, data, TDB_REPLACE));
296
297done:
298 TALLOC_FREE( prec );
299 return ret;
300}
301
302/*********************************************************************
303*********************************************************************/
304
305bool delete_pipe_opendb( smb_np_struct *p )
306{
307 struct db_record *dbrec;
308 struct pipe_open_rec *prec;
309 TDB_DATA *key;
310 bool ret = False;
311
312 if ( (prec = TALLOC_P( talloc_tos(), struct pipe_open_rec)) == NULL ) {
313 DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
314 return False;
315 }
316
317 fill_pipe_open_rec( prec, p );
318 if ( (key = make_pipe_rec_key( prec )) == NULL ) {
319 goto done;
320 }
321
322 if (!(dbrec = connections_fetch_record(prec, *key))) {
323 DEBUG(0, ("connections_fetch_record failed\n"));
324 goto done;
325 }
326
327 ret = NT_STATUS_IS_OK(dbrec->delete_rec(dbrec));
328
329done:
330 TALLOC_FREE( prec );
331 return ret;
332}
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