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 = sys_getpid();
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 %u doesn't exist - deleting connections %d [%s]\n",
111
(unsigned int)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
BOOL claim_connection(connection_struct *conn, const char *name,int max_connections,BOOL Clear, uint32 msg_flags)
129
struct connections_key key;
130
struct connections_data crec;
134
tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
135
O_RDWR | O_CREAT, 0644);
141
* Enforce the max connections parameter.
144
if (max_connections > 0) {
145
struct count_stat cs;
147
cs.mypid = sys_getpid();
148
cs.curr_connections = 0;
149
cs.name = lp_servicename(SNUM(conn));
153
* This has a race condition, but locking the chain before hand is worse
154
* as it leads to deadlock.
157
if (tdb_traverse(tdb, count_fn, &cs) == -1) {
158
DEBUG(0,("claim_connection: traverse of connections.tdb failed with error %s.\n",
159
tdb_errorstr(tdb) ));
163
if (cs.curr_connections >= max_connections) {
164
DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
165
max_connections, name ));
170
DEBUG(5,("claiming %s %d\n",name,max_connections));
172
make_conn_key(conn, name, &kbuf, &key);
174
/* fill in the crec */
176
crec.magic = 0x280267;
177
crec.pid = sys_getpid();
178
crec.cnum = conn?conn->cnum:-1;
180
crec.uid = conn->uid;
181
crec.gid = conn->gid;
182
safe_strcpy(crec.name,
183
lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
185
crec.start = time(NULL);
186
crec.bcast_msg_flags = msg_flags;
188
safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
189
safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
191
dbuf.dptr = (char *)&crec;
192
dbuf.dsize = sizeof(crec);
194
if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
195
DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
196
tdb_errorstr(tdb) ));
203
BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
205
struct connections_key key;
206
struct connections_data *pcrec;
212
DEBUG(10,("register_message_flags: %s flags 0x%x\n",
213
doreg ? "adding" : "removing",
214
(unsigned int)msg_flags ));
216
make_conn_key(NULL, "", &kbuf, &key);
218
dbuf = tdb_fetch(tdb, kbuf);
220
DEBUG(0,("register_message_flags: tdb_fetch failed\n"));
224
pcrec = (struct connections_data *)dbuf.dptr;
226
pcrec->bcast_msg_flags |= msg_flags;
228
pcrec->bcast_msg_flags &= ~msg_flags;
230
if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
231
DEBUG(0,("register_message_flags: tdb_store failed with error %s.\n",
232
tdb_errorstr(tdb) ));
233
SAFE_FREE(dbuf.dptr);
237
DEBUG(10,("register_message_flags: new flags 0x%x\n",
238
(unsigned int)pcrec->bcast_msg_flags ));
240
SAFE_FREE(dbuf.dptr);