1 files changed, 332 insertions, 0 deletions
diff --git a/source3/smbd/connection.c b/source3/smbd/connection.c
new file mode 100644
index 0000000000..8dd5964f5f
--- /dev/null
+++ b/source3/smbd/connection.c
@@ -0,0 +1,332 @@
+/* 
+   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"
+
+/****************************************************************************
+ 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));
+
+	if (!(rec = connections_fetch_entry(NULL, conn, name))) {
+		DEBUG(0, ("connections_fetch_entry failed\n"));
+		return False;
+	}
+
+	status = rec->delete_rec(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 {
+	pid_t mypid;
+	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 = rec->delete_rec(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;
+
+	cs.mypid = sys_getpid();
+	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.
+	 */
+
+	if (connections_forall(count_fn, &cs) == -1) {
+		DEBUG(0,("count_current_connections: traverse of "
+			 "connections.tdb failed\n"));
+		return False;
+	}
+
+	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,
+		      uint32 msg_flags)
+{
+	struct db_record *rec;
+	struct connections_data crec;
+	TDB_DATA dbuf;
+	NTSTATUS status;
+	char addr[INET6_ADDRSTRLEN];
+
+	DEBUG(5,("claiming [%s]\n", name));
+
+	if (!(rec = connections_fetch_entry(talloc_tos(), conn, name))) {
+		DEBUG(0, ("connections_fetch_entry failed\n"));
+		return False;
+	}
+
+	/* 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->server_info->utok.uid;
+		crec.gid = conn->server_info->utok.gid;
+		strlcpy(crec.servicename, lp_servicename(SNUM(conn)),
+			sizeof(crec.servicename));
+	}
+	crec.start = time(NULL);
+	crec.bcast_msg_flags = msg_flags;
+	
+	strlcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine));
+	strlcpy(crec.addr,conn?conn->client_address:
+			client_addr(get_client_fd(),addr,sizeof(addr)),
+		sizeof(crec.addr));
+
+	dbuf.dptr = (uint8 *)&crec;
+	dbuf.dsize = sizeof(crec);
+
+	status = rec->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;
+}
+
+bool register_message_flags(bool doreg, uint32 msg_flags)
+{
+	struct db_record *rec;
+	struct connections_data *pcrec;
+	NTSTATUS status;
+
+	DEBUG(10,("register_message_flags: %s flags 0x%x\n",
+		doreg ? "adding" : "removing",
+		(unsigned int)msg_flags ));
+
+	if (!(rec = connections_fetch_entry(NULL, NULL, ""))) {
+		DEBUG(0, ("connections_fetch_entry failed\n"));
+		return False;
+	}
+
+	if (rec->value.dsize != sizeof(struct connections_data)) {
+		DEBUG(0,("register_message_flags: Got wrong record size\n"));
+		TALLOC_FREE(rec);
+		return False;
+	}
+
+	pcrec = (struct connections_data *)rec->value.dptr;
+	if (doreg)
+		pcrec->bcast_msg_flags |= msg_flags;
+	else
+		pcrec->bcast_msg_flags &= ~msg_flags;
+
+	status = rec->store(rec, rec->value, TDB_REPLACE);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
+			 nt_errstr(status)));
+		TALLOC_FREE(rec);
+		return False;
+	}
+
+	DEBUG(10,("register_message_flags: new flags 0x%x\n",
+		(unsigned int)pcrec->bcast_msg_flags ));
+
+	TALLOC_FREE(rec);
+
+	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;
+	}
+	
+	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;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+bool store_pipe_opendb( smb_np_struct *p )
+{
+	struct db_record *dbrec;
+	struct pipe_open_rec *prec;
+	TDB_DATA *key;
+	TDB_DATA data;
+	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 (!(dbrec = connections_fetch_record(prec, *key))) {
+		DEBUG(0, ("connections_fetch_record failed\n"));
+		goto done;
+	}
+
+	ret = NT_STATUS_IS_OK(dbrec->store(dbrec, data, TDB_REPLACE));
+	
+done:
+	TALLOC_FREE( prec );	
+	return ret;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+bool delete_pipe_opendb( smb_np_struct *p )
+{
+	struct db_record *dbrec;
+	struct pipe_open_rec *prec;
+	TDB_DATA *key;
+	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 (!(dbrec = connections_fetch_record(prec, *key))) {
+		DEBUG(0, ("connections_fetch_record failed\n"));
+		goto done;
+	}
+
+	ret = NT_STATUS_IS_OK(dbrec->delete_rec(dbrec));
+	
+done:
+	TALLOC_FREE( prec );
+	return ret;
+}