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/*
Unix SMB/CIFS implementation.
connection claim routines
Copyright (C) Andrew Tridgell 1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "dbwrap/dbwrap.h"
#include "auth.h"
#include "../lib/tsocket/tsocket.h"
/****************************************************************************
Delete a connection record.
****************************************************************************/
bool yield_connection(connection_struct *conn, const char *name)
{
struct db_record *rec;
NTSTATUS status;
DEBUG(3,("Yielding connection to %s\n",name));
rec = connections_fetch_entry(talloc_tos(), conn, name);
if (rec == NULL) {
DEBUG(0, ("connections_fetch_entry failed\n"));
return False;
}
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG( NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) ? 3 : 0,
("deleting connection record returned %s\n",
nt_errstr(status)));
}
TALLOC_FREE(rec);
return NT_STATUS_IS_OK(status);
}
struct count_stat {
int curr_connections;
const char *name;
bool Clear;
};
/****************************************************************************
Count the entries belonging to a service in the connection db.
****************************************************************************/
static int count_fn(struct db_record *rec,
const struct connections_key *ckey,
const struct connections_data *crec,
void *udp)
{
struct count_stat *cs = (struct count_stat *)udp;
if (crec->cnum == -1) {
return 0;
}
/* If the pid was not found delete the entry from connections.tdb */
if (cs->Clear && !process_exists(crec->pid) && (errno == ESRCH)) {
NTSTATUS status;
DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
procid_str_static(&crec->pid), crec->cnum,
crec->servicename));
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("count_fn: tdb_delete failed with error %s\n",
nt_errstr(status)));
}
return 0;
}
if (strequal(crec->servicename, cs->name))
cs->curr_connections++;
return 0;
}
/****************************************************************************
Claim an entry in the connections database.
****************************************************************************/
int count_current_connections( const char *sharename, bool clear )
{
struct count_stat cs;
int ret;
cs.curr_connections = 0;
cs.name = sharename;
cs.Clear = clear;
/*
* This has a race condition, but locking the chain before hand is worse
* as it leads to deadlock.
*/
/*
* become_root() because we might have to open connections.tdb
* via ctdb, which is not possible without root.
*/
become_root();
ret = connections_forall(count_fn, &cs);
unbecome_root();
if (ret < 0) {
DEBUG(0,("count_current_connections: traverse of "
"connections.tdb failed\n"));
return 0;
}
return cs.curr_connections;
}
bool connections_snum_used(struct smbd_server_connection *unused, int snum)
{
int active;
active = count_current_connections(lp_servicename(snum), true);
if (active > 0) {
return true;
}
return false;
}
/****************************************************************************
Claim an entry in the connections database.
****************************************************************************/
bool claim_connection(connection_struct *conn, const char *name)
{
struct db_record *rec;
struct connections_data crec;
char *raddr;
TDB_DATA dbuf;
NTSTATUS status;
DEBUG(5,("claiming [%s]\n", name));
if (!(rec = connections_fetch_entry(talloc_tos(), conn, name))) {
DEBUG(0, ("connections_fetch_entry failed\n"));
return False;
}
/* Make clear that we require the optional unix_token in the source3 code */
SMB_ASSERT(conn->session_info->unix_token);
/* fill in the crec */
ZERO_STRUCT(crec);
crec.magic = 0x280267;
crec.pid = sconn_server_id(conn->sconn);
crec.cnum = conn->cnum;
crec.uid = conn->session_info->unix_token->uid;
crec.gid = conn->session_info->unix_token->gid;
strlcpy(crec.servicename, lp_servicename(SNUM(conn)),
sizeof(crec.servicename));
crec.start = time(NULL);
raddr = tsocket_address_inet_addr_string(conn->sconn->remote_address,
talloc_tos());
if (raddr == NULL) {
return false;
}
strlcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine));
strlcpy(crec.addr, raddr, sizeof(crec.addr));
dbuf.dptr = (uint8 *)&crec;
dbuf.dsize = sizeof(crec);
status = dbwrap_record_store(rec, dbuf, TDB_REPLACE);
TALLOC_FREE(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
nt_errstr(status)));
return False;
}
return True;
}
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