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 2 of the License, or
+ 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
-
-static void make_conn_key(connection_struct *conn, const char *name, TDB_DATA *pkbuf, struct connections_key *pkey)
-{
- ZERO_STRUCTP(pkey);
- pkey->pid = procid_self();
- pkey->cnum = conn?conn->cnum:-1;
- fstrcpy(pkey->name, name);
-#ifdef DEVELOPER
- /* valgrind fixer... */
- {
- size_t sl = strlen(pkey->name);
- if (sizeof(fstring)-sl)
- memset(&pkey->name[sl], '\0', sizeof(fstring)-sl);
- }
-#endif
-
- pkbuf->dptr = (uint8 *)pkey;
- pkbuf->dsize = sizeof(*pkey);
-}
-
-/****************************************************************************
- Delete a connection record.
-****************************************************************************/
-
-BOOL yield_connection(connection_struct *conn, const char *name)
-{
- struct connections_key key;
- TDB_DATA kbuf;
- TDB_CONTEXT *tdb = conn_tdb_ctx(True);
-
- if (!tdb)
- return False;
-
- DEBUG(3,("Yielding connection to %s\n",name));
-
- make_conn_key(conn, name, &kbuf, &key);
-
- if (tdb_delete(tdb, kbuf) != 0) {
- int dbg_lvl = (!conn && (tdb_error(tdb) == TDB_ERR_NOEXIST)) ? 3 : 0;
- DEBUG(dbg_lvl,("yield_connection: tdb_delete for name %s failed with error %s.\n",
- name, tdb_errorstr(tdb) ));
- return (False);
- }
-
- return(True);
-}
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "dbwrap/dbwrap.h"
+#include "auth.h"
+#include "../lib/tsocket/tsocket.h"
+#include "messages.h"
+#include "lib/conn_tdb.h"
struct count_stat {
- pid_t mypid;
int curr_connections;
const char *name;
- BOOL Clear;
+ bool verify;
};
/****************************************************************************
Count the entries belonging to a service in the connection db.
****************************************************************************/
-static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
+static int count_fn(struct smbXsrv_tcon_global0 *tcon,
+ void *udp)
{
- struct connections_data crec;
struct count_stat *cs = (struct count_stat *)udp;
-
- if (dbuf.dsize != sizeof(crec)) {
- return 0;
- }
- memcpy(&crec, dbuf.dptr, sizeof(crec));
-
- if (crec.cnum == -1) {
+ if (cs->verify && !process_exists(tcon->server_id)) {
return 0;
}
- /* If the pid was not found delete the entry from connections.tdb */
-
- if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
- DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
- procid_str_static(&crec.pid), crec.cnum, crec.servicename));
- if (tdb_delete(the_tdb, kbuf) != 0)
- DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(the_tdb) ));
- return 0;
- }
-
- if (cs->name) {
- /* We are counting all the connections to a given share. */
- if (strequal(crec.servicename, cs->name)) {
- cs->curr_connections++;
- }
- } else {
- /* We are counting all the connections. Static registrations
- * like the lpq backgroud process and the smbd daemon process
- * have a cnum of -1, so won't be counted here.
- */
+ if (strequal(tcon->share_name, cs->name)) {
cs->curr_connections++;
}
Claim an entry in the connections database.
****************************************************************************/
-int count_current_connections( const char *sharename, BOOL clear )
+int count_current_connections(const char *sharename, bool verify)
{
struct count_stat cs;
- TDB_CONTEXT *tdb = conn_tdb_ctx(True);
+ NTSTATUS status;
- cs.mypid = sys_getpid();
cs.curr_connections = 0;
cs.name = sharename;
- cs.Clear = clear;
+ cs.verify = verify;
/*
* This has a race condition, but locking the chain before hand is worse
* as it leads to deadlock.
*/
- if (tdb_traverse(tdb, count_fn, &cs) == -1) {
- DEBUG(0,("count_current_connections: traverse of connections.tdb failed with error %s\n",
- tdb_errorstr(tdb) ));
- DEBUGADD(0, ("count_current_connections: connection count of %d might not be accurate",
- cs.curr_connections));
- }
-
- /* If the traverse failed part-way through, we at least return
- * as many connections as we had already counted. If it failed
- * right at the start, we will return 0, which is about all we
- * can do anywway.
- */
-
- return cs.curr_connections;
-}
-
-/****************************************************************************
- Count the number of connections open across all shares.
-****************************************************************************/
-
-int count_all_current_connections(void)
-{
- return count_current_connections(NULL, True /* clear stale entries */);
-}
-
-/****************************************************************************
- Claim an entry in the connections database.
-****************************************************************************/
-
-BOOL claim_connection(connection_struct *conn, const char *name,
- int max_connections, uint32 msg_flags)
-{
- struct connections_key key;
- struct connections_data crec;
- TDB_DATA kbuf, dbuf;
- TDB_CONTEXT *tdb = conn_tdb_ctx(True);
-
- if (!tdb) {
- return False;
- }
-
- /*
- * Enforce the max connections parameter.
- */
-
- if (max_connections > 0) {
- int curr_connections;
-
- curr_connections = count_current_connections( lp_servicename(SNUM(conn)), True );
-
- if (curr_connections >= max_connections) {
- DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
- max_connections, name ));
- return False;
- }
- }
-
- DEBUG(5,("claiming %s %d\n",name,max_connections));
-
- make_conn_key(conn, name, &kbuf, &key);
-
- /* fill in the crec */
- ZERO_STRUCT(crec);
- crec.magic = 0x280267;
- crec.pid = procid_self();
- crec.cnum = conn?conn->cnum:-1;
- if (conn) {
- crec.uid = conn->uid;
- crec.gid = conn->gid;
- safe_strcpy(crec.servicename,
- lp_servicename(SNUM(conn)),sizeof(crec.servicename)-1);
- }
- crec.start = time(NULL);
- crec.bcast_msg_flags = msg_flags;
-
- safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
- safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
-
- dbuf.dptr = (uint8 *)&crec;
- dbuf.dsize = sizeof(crec);
-
- if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
- DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
- tdb_errorstr(tdb) ));
- return False;
- }
+ status = smbXsrv_tcon_global_traverse(count_fn, &cs);
- return True;
-}
-
-BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
-{
- struct connections_key key;
- struct connections_data *pcrec;
- TDB_DATA kbuf, dbuf;
- TDB_CONTEXT *tdb = conn_tdb_ctx(True);
-
- if (!tdb)
- return False;
-
- DEBUG(10,("register_message_flags: %s flags 0x%x\n",
- doreg ? "adding" : "removing",
- (unsigned int)msg_flags ));
-
- make_conn_key(NULL, "", &kbuf, &key);
-
- dbuf = tdb_fetch(tdb, kbuf);
- if (!dbuf.dptr) {
- DEBUG(0,("register_message_flags: tdb_fetch failed: %s\n",
- tdb_errorstr(tdb)));
- return False;
- }
-
- pcrec = (struct connections_data *)dbuf.dptr;
- if (doreg)
- pcrec->bcast_msg_flags |= msg_flags;
- else
- pcrec->bcast_msg_flags &= ~msg_flags;
-
- if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
- DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
- tdb_errorstr(tdb) ));
- SAFE_FREE(dbuf.dptr);
- return False;
- }
-
- DEBUG(10,("register_message_flags: new flags 0x%x\n",
- (unsigned int)pcrec->bcast_msg_flags ));
-
- SAFE_FREE(dbuf.dptr);
- return True;
-}
-
-/*********************************************************************
-*********************************************************************/
-
-static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
-{
- TDB_DATA *kbuf = NULL;
- fstring key_string;
-
- if ( !prec )
- return NULL;
-
- if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
- return NULL;
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("count_current_connections: traverse of "
+ "smbXsrv_tcon_global.tdb failed - %s\n",
+ nt_errstr(status)));
+ return 0;
}
-
- snprintf( key_string, sizeof(key_string), "%s/%d/%d",
- prec->name, procid_to_pid(&prec->pid), prec->pnum );
-
- *kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
- if (kbuf->dptr == NULL )
- return NULL;
-
- return kbuf;
-}
-
-/*********************************************************************
-*********************************************************************/
-
-static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
-{
- prec->pid = pid_to_procid(sys_getpid());
- prec->pnum = p->pnum;
- prec->uid = geteuid();
- fstrcpy( prec->name, p->name );
- return;
+ return cs.curr_connections;
}
-/*********************************************************************
-*********************************************************************/
-
-BOOL store_pipe_opendb( smb_np_struct *p )
+bool connections_snum_used(struct smbd_server_connection *unused, int snum)
{
- struct pipe_open_rec *prec;
- TDB_DATA *key;
- TDB_DATA data;
- TDB_CONTEXT *pipe_tdb;
- BOOL ret = False;
-
- if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
- DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
- return False;
- }
-
- fill_pipe_open_rec( prec, p );
- if ( (key = make_pipe_rec_key( prec )) == NULL ) {
- goto done;
- }
-
- data.dptr = (uint8 *)prec;
- data.dsize = sizeof(struct pipe_open_rec);
-
- if ( (pipe_tdb = conn_tdb_ctx(True) ) == NULL ) {
- goto done;
- }
-
- ret = (tdb_store( pipe_tdb, *key, data, TDB_REPLACE ) != -1);
-
-done:
- TALLOC_FREE( prec );
- return ret;
-}
-
-/*********************************************************************
-*********************************************************************/
+ int active;
-BOOL delete_pipe_opendb( smb_np_struct *p )
-{
- struct pipe_open_rec *prec;
- TDB_DATA *key;
- TDB_CONTEXT *pipe_tdb;
- BOOL ret = False;
-
- if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
- DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
- return False;
- }
-
- fill_pipe_open_rec( prec, p );
- if ( (key = make_pipe_rec_key( prec )) == NULL ) {
- goto done;
- }
-
- if ( (pipe_tdb = conn_tdb_ctx(True) ) == NULL ) {
- goto done;
+ active = count_current_connections(lp_servicename(talloc_tos(), snum),
+ true);
+ if (active > 0) {
+ return true;
}
- ret = (tdb_delete( pipe_tdb, *key ) != -1 );
-
-done:
- TALLOC_FREE( prec );
- return ret;
+ return false;
}