2 Unix SMB/CIFS implementation.
3 handle unexpected packets
4 Copyright (C) Andrew Tridgell 2000
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 static struct tdb_wrap *tdbd = NULL;
26 /* the key type used in the unexpeceted packet database */
27 struct unexpected_key {
28 enum packet_type packet_type;
35 /****************************************************************************
36 all unexpected packets are passed in here, to be stored in a unexpected
37 packet database. This allows nmblookup and other tools to receive packets
38 erroneoously sent to the wrong port by broken MS systems
39 **************************************************************************/
40 void unexpected_packet(struct packet_struct *p)
44 struct unexpected_key key;
49 char *path = smbd_tmp_path(NULL, "unexpected.tdb");
50 tdbd = tdb_wrap_open(NULL, path, 0,
52 O_RDWR | O_CREAT, 0644);
59 memset(buf,'\0',sizeof(buf));
61 len = build_packet(buf, p);
63 key.packet_type = p->packet_type;
64 key.timestamp = p->timestamp;
67 kbuf.dptr = (char *)&key;
68 kbuf.dsize = sizeof(key);
72 tdb_store(tdbd->tdb, kbuf, dbuf, TDB_REPLACE);
78 /****************************************************************************
79 delete the record if it is too old
80 **************************************************************************/
81 static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
83 struct unexpected_key key;
85 memcpy(&key, kbuf.dptr, sizeof(key));
87 if (lastt - key.timestamp > NMBD_UNEXPECTED_TIMEOUT) {
88 tdb_delete(ttdb, kbuf);
95 /****************************************************************************
96 delete all old unexpected packets
97 **************************************************************************/
98 void clear_unexpected(time_t t)
102 if ((lastt != 0) && (t < lastt + NMBD_UNEXPECTED_TIMEOUT))
107 tdb_traverse(tdbd->tdb, traverse_fn, NULL);
111 static struct packet_struct *matched_packet;
113 static enum packet_type match_type;
114 static const char *match_name;
116 /****************************************************************************
117 tdb traversal fn to find a matching 137 packet
118 **************************************************************************/
119 static int traverse_match(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
121 struct unexpected_key key;
122 struct packet_struct *p;
124 memcpy(&key, kbuf.dptr, sizeof(key));
126 if (key.packet_type != match_type) return 0;
128 p = parse_packet(dbuf.dptr, dbuf.dsize, match_type);
130 if ((match_type == NMB_PACKET &&
131 p->packet.nmb.header.name_trn_id == match_id) ||
132 (match_type == DGRAM_PACKET &&
133 match_mailslot_name(p, match_name))) {
144 /****************************************************************************
145 check for a particular packet in the unexpected packet queue
146 **************************************************************************/
147 struct packet_struct *receive_unexpected(enum packet_type packet_type, int id,
148 const char *mailslot_name)
150 struct tdb_wrap *tdb2;
153 path = smbd_tmp_path(NULL, "unexpected.tdb");
154 tdb2 = tdb_wrap_open(NULL, path, 0, 0, O_RDONLY, 0);
160 matched_packet = NULL;
162 match_type = packet_type;
163 match_name = mailslot_name;
165 tdb_traverse(tdb2->tdb, traverse_match, NULL);
169 return matched_packet;