the bulk of the unexpected packet handling code is in here

1 files changed, 160 insertions, 0 deletions

diff --git a/source/libsmb/unexpected.c b/source/libsmb/unexpected.c
new file mode 100644
index 00000000000..57fad7c6961
--- /dev/null
+++ b/source/libsmb/unexpected.c
@@ -0,0 +1,160 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   handle unexpected packets
+   Copyright (C) Andrew Tridgell 2000
+   
+   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
+   (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.
+   
+*/
+
+#include "includes.h"
+
+extern int DEBUGLEVEL;
+
+static TDB_CONTEXT *tdb;
+
+/* the key type used in the unexpeceted packet database */
+struct unexpected_key {
+	enum packet_type packet_type;
+	time_t timestamp;
+	int count;
+};
+
+
+
+/****************************************************************************
+ all unexpected packets are passed in here, to be stored in a unexpected
+ packet database. This allows nmblookup and other tools to receive packets
+ erroneoously sent to the wrong port by broken MS systems
+  **************************************************************************/
+void unexpected_packet(struct packet_struct *p)
+{
+	static int count;
+	TDB_DATA kbuf, dbuf;
+	struct unexpected_key key;
+	char buf[1024];
+	int len=0;
+
+	if (!tdb) {
+		tdb = tdb_open(lock_path("unexpected.tdb"), 0, 
+			       TDB_CLEAR_IF_FIRST,
+			       O_RDWR | O_CREAT, 0644);
+		if (!tdb) {
+			DEBUG(0,("Failed to open unexpected.tdb\n"));
+			return;
+		}
+	}
+
+	memset(buf,'\0',sizeof(buf));
+	
+	len = build_packet(buf, p);
+
+	key.packet_type = p->packet_type;
+	key.timestamp = p->timestamp;
+	key.count = count++;
+
+	kbuf.dptr = (char *)&key;
+	kbuf.dsize = sizeof(key);
+	dbuf.dptr = buf;
+	dbuf.dsize = len;
+
+	tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
+}
+
+
+static time_t lastt;
+
+/****************************************************************************
+delete the record if it is too old
+  **************************************************************************/
+static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf)
+{
+	struct unexpected_key key;
+
+	memcpy(&key, kbuf.dptr, sizeof(key));
+
+	if (lastt - key.timestamp > NMBD_UNEXPECTED_TIMEOUT) {
+		tdb_delete(ttdb, kbuf);
+	}
+
+	return 0;
+}
+
+
+/****************************************************************************
+delete all old unexpected packets
+  **************************************************************************/
+void clear_unexpected(time_t t)
+{
+	if (!tdb) return;
+
+	if ((lastt != 0) && (t < lastt + NMBD_UNEXPECTED_TIMEOUT))
+		return;
+
+	lastt = t;
+
+	tdb_traverse(tdb, traverse_fn);
+}
+
+
+static struct packet_struct *matched_packet;
+static int match_trn_id;
+
+/****************************************************************************
+tdb traversal fn to find a matching 137 packet
+  **************************************************************************/
+static int traverse_match_137(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf)
+{
+	struct unexpected_key key;
+	struct packet_struct *p;
+
+	memcpy(&key, kbuf.dptr, sizeof(key));
+
+	if (key.packet_type != NMB_PACKET) return 0;
+
+	p = parse_packet(dbuf.dptr, dbuf.dsize, NMB_PACKET);
+
+	if (p->packet_type == NMB_PACKET &&
+	    p->packet.nmb.header.name_trn_id == match_trn_id) {
+		matched_packet = p;
+		return -1;
+	}
+
+	free_packet(p);
+
+	return 0;
+}
+
+
+/****************************************************************************
+check for a particular packet in the unexpected packet queue
+  **************************************************************************/
+struct packet_struct *receive_unexpected_137(int trn_id)
+{
+	TDB_CONTEXT *tdb2;
+
+	tdb2 = tdb_open(lock_path("unexpected.tdb"), 0, 0, O_RDONLY, 0);
+	if (!tdb2) return NULL;
+
+	matched_packet = NULL;
+	match_trn_id = trn_id;
+
+	tdb_traverse(tdb2, traverse_match_137);
+
+	tdb_close(tdb2);
+
+	return matched_packet;
+}