| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | connection claim routines
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| 4 | Copyright (C) Andrew Tridgell 1998
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 | #include "smbd/smbd.h"
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| 22 | #include "smbd/globals.h"
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| 23 | #include "dbwrap/dbwrap.h"
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| 24 | #include "auth.h"
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| 25 | #include "../lib/tsocket/tsocket.h"
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| 26 | #include "messages.h"
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| 27 | #include "lib/conn_tdb.h"
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| 28 |
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| 29 | struct count_stat {
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| 30 | int curr_connections;
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| 31 | const char *name;
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| 32 | bool verify;
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| 33 | };
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| 34 |
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| 35 | /****************************************************************************
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| 36 | Count the entries belonging to a service in the connection db.
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| 37 | ****************************************************************************/
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| 38 |
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| 39 | static int count_fn(struct smbXsrv_tcon_global0 *tcon,
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| 40 | void *udp)
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| 41 | {
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| 42 | struct count_stat *cs = (struct count_stat *)udp;
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| 43 |
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| 44 | if (cs->verify && !process_exists(tcon->server_id)) {
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| 45 | return 0;
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| 46 | }
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| 47 |
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| 48 | if (strequal(tcon->share_name, cs->name)) {
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| 49 | cs->curr_connections++;
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| 50 | }
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| 51 |
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| 52 | return 0;
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| 53 | }
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| 54 |
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| 55 | /****************************************************************************
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| 56 | Claim an entry in the connections database.
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| 57 | ****************************************************************************/
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| 58 |
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| 59 | int count_current_connections(const char *sharename, bool verify)
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| 60 | {
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| 61 | struct count_stat cs;
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| 62 | NTSTATUS status;
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| 63 |
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| 64 | cs.curr_connections = 0;
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| 65 | cs.name = sharename;
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| 66 | cs.verify = verify;
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| 67 |
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| 68 | /*
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| 69 | * This has a race condition, but locking the chain before hand is worse
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| 70 | * as it leads to deadlock.
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| 71 | */
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| 72 |
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| 73 | status = smbXsrv_tcon_global_traverse(count_fn, &cs);
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| 74 |
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| 75 | if (!NT_STATUS_IS_OK(status)) {
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| 76 | DEBUG(0,("count_current_connections: traverse of "
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| 77 | "smbXsrv_tcon_global.tdb failed - %s\n",
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| 78 | nt_errstr(status)));
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| 79 | return 0;
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| 80 | }
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| 81 |
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| 82 | return cs.curr_connections;
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| 83 | }
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| 84 |
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| 85 | bool connections_snum_used(struct smbd_server_connection *unused, int snum)
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| 86 | {
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| 87 | int active;
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| 88 |
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| 89 | active = count_current_connections(lp_servicename(talloc_tos(), snum),
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| 90 | true);
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| 91 | if (active > 0) {
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| 92 | return true;
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| 93 | }
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| 94 |
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| 95 | return false;
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| 96 | }
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