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Unix SMB/CIFS implementation.
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connection claim routines
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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static TDB_CONTEXT *tdb;
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/****************************************************************************
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Return the connection tdb context (used for message send all).
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****************************************************************************/
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TDB_CONTEXT *conn_tdb_ctx(void)
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tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
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O_RDWR | O_CREAT, 0644);
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static void make_conn_key(connection_struct *conn, const char *name, TDB_DATA *pkbuf, struct connections_key *pkey)
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pkey->pid = procid_self();
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pkey->cnum = conn?conn->cnum:-1;
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fstrcpy(pkey->name, name);
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/* valgrind fixer... */
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size_t sl = strlen(pkey->name);
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if (sizeof(fstring)-sl)
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memset(&pkey->name[sl], '\0', sizeof(fstring)-sl);
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pkbuf->dptr = (char *)pkey;
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pkbuf->dsize = sizeof(*pkey);
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/****************************************************************************
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Delete a connection record.
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****************************************************************************/
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BOOL yield_connection(connection_struct *conn, const char *name)
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struct connections_key key;
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DEBUG(3,("Yielding connection to %s\n",name));
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make_conn_key(conn, name, &kbuf, &key);
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if (tdb_delete(tdb, kbuf) != 0) {
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int dbg_lvl = (!conn && (tdb_error(tdb) == TDB_ERR_NOEXIST)) ? 3 : 0;
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DEBUG(dbg_lvl,("yield_connection: tdb_delete for name %s failed with error %s.\n",
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name, tdb_errorstr(tdb) ));
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/****************************************************************************
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Count the entries belonging to a service in the connection db.
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****************************************************************************/
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static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
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struct connections_data crec;
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struct count_stat *cs = (struct count_stat *)udp;
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if (dbuf.dsize != sizeof(crec))
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memcpy(&crec, dbuf.dptr, sizeof(crec));
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/* If the pid was not found delete the entry from connections.tdb */
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if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
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DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
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procid_str_static(&crec.pid), crec.cnum, crec.name));
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if (tdb_delete(the_tdb, kbuf) != 0)
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DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(tdb) ));
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if (strequal(crec.name, cs->name))
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cs->curr_connections++;
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/****************************************************************************
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Claim an entry in the connections database.
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****************************************************************************/
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int count_current_connections( const char *sharename, BOOL clear )
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struct count_stat cs;
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cs.mypid = sys_getpid();
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cs.curr_connections = 0;
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* This has a race condition, but locking the chain before hand is worse
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* as it leads to deadlock.
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if (tdb_traverse(tdb, count_fn, &cs) == -1) {
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DEBUG(0,("claim_connection: traverse of connections.tdb failed with error %s.\n",
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tdb_errorstr(tdb) ));
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return cs.curr_connections;
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/****************************************************************************
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Claim an entry in the connections database.
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****************************************************************************/
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BOOL claim_connection(connection_struct *conn, const char *name,int max_connections,BOOL Clear, uint32 msg_flags)
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struct connections_key key;
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struct connections_data crec;
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if ( (tdb =conn_tdb_ctx()) == NULL ) {
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* Enforce the max connections parameter.
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if (max_connections > 0) {
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int curr_connections;
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curr_connections = count_current_connections( lp_servicename(SNUM(conn)), True );
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if (curr_connections >= max_connections) {
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DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
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max_connections, name ));
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DEBUG(5,("claiming %s %d\n",name,max_connections));
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make_conn_key(conn, name, &kbuf, &key);
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/* fill in the crec */
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crec.magic = 0x280267;
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crec.pid = procid_self();
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crec.cnum = conn?conn->cnum:-1;
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crec.uid = conn->uid;
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crec.gid = conn->gid;
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safe_strcpy(crec.name,
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lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
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crec.start = time(NULL);
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crec.bcast_msg_flags = msg_flags;
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safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
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safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
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dbuf.dptr = (char *)&crec;
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dbuf.dsize = sizeof(crec);
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if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
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DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
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tdb_errorstr(tdb) ));
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BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
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struct connections_key key;
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struct connections_data *pcrec;
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DEBUG(10,("register_message_flags: %s flags 0x%x\n",
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doreg ? "adding" : "removing",
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(unsigned int)msg_flags ));
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make_conn_key(NULL, "", &kbuf, &key);
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dbuf = tdb_fetch(tdb, kbuf);
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DEBUG(0,("register_message_flags: tdb_fetch failed: %s\n",
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pcrec = (struct connections_data *)dbuf.dptr;
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pcrec->bcast_msg_flags |= msg_flags;
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pcrec->bcast_msg_flags &= ~msg_flags;
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if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
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DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
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tdb_errorstr(tdb) ));
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SAFE_FREE(dbuf.dptr);
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DEBUG(10,("register_message_flags: new flags 0x%x\n",
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(unsigned int)pcrec->bcast_msg_flags ));
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SAFE_FREE(dbuf.dptr);
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/*********************************************************************
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*********************************************************************/
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static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
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TDB_DATA *kbuf = NULL;
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if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
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snprintf( key_string, sizeof(key_string), "%s/%d/%d",
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prec->name, procid_to_pid(&prec->pid), prec->pnum );
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if ( (kbuf->dptr = talloc_strdup(prec, key_string)) == NULL )
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kbuf->dsize = strlen(key_string)+1;
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/*********************************************************************
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*********************************************************************/
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static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
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prec->pid = pid_to_procid(sys_getpid());
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prec->pnum = p->pnum;
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prec->uid = geteuid();
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fstrcpy( prec->name, p->name );
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/*********************************************************************
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*********************************************************************/
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BOOL store_pipe_opendb( smb_np_struct *p )
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struct pipe_open_rec *prec;
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TDB_CONTEXT *pipe_tdb;
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if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
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DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
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fill_pipe_open_rec( prec, p );
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if ( (key = make_pipe_rec_key( prec )) == NULL ) {
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data.dptr = (char*)prec;
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data.dsize = sizeof(struct pipe_open_rec);
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if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
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ret = (tdb_store( pipe_tdb, *key, data, TDB_REPLACE ) != -1);
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/*********************************************************************
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*********************************************************************/
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BOOL delete_pipe_opendb( smb_np_struct *p )
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struct pipe_open_rec *prec;
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TDB_CONTEXT *pipe_tdb;
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if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
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DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
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fill_pipe_open_rec( prec, p );
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if ( (key = make_pipe_rec_key( prec )) == NULL ) {
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if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
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ret = (tdb_delete( pipe_tdb, *key ) != -1 );
added
removed
source/smbd/connection.c
