3b72a9505a13d33c5c0f4a969ce30bcf1483edc7
[ira/wip.git] / source3 / smbd / connection.c
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
26 bool 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
49 struct 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
60 static 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
97 int 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
124 int 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
133 bool 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
184 bool 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 }