2 Unix SMB/Netbios implementation.
4 handle unexpected packets
5 Copyright (C) Andrew Tridgell 2000
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern int DEBUGLEVEL
;
27 static TDB_CONTEXT
*tdbd
= NULL
;
29 /* the key type used in the unexpeceted packet database */
30 struct unexpected_key
{
31 enum packet_type packet_type
;
38 /****************************************************************************
39 all unexpected packets are passed in here, to be stored in a unexpected
40 packet database. This allows nmblookup and other tools to receive packets
41 erroneoously sent to the wrong port by broken MS systems
42 **************************************************************************/
43 void unexpected_packet(struct packet_struct
*p
)
47 struct unexpected_key key
;
52 tdbd
= tdb_open(lock_path("unexpected.tdb"), 1,
54 O_RDWR
| O_CREAT
, 0644);
56 DEBUG(0,("Failed to open unexpected.tdb\n"));
61 memset(buf
,'\0',sizeof(buf
));
63 len
= build_packet(buf
, p
);
65 key
.packet_type
= p
->packet_type
;
66 key
.timestamp
= p
->timestamp
;
69 kbuf
.dptr
= (char *)&key
;
70 kbuf
.dsize
= sizeof(key
);
74 tdb_store(tdbd
, kbuf
, dbuf
, TDB_REPLACE
);
80 /****************************************************************************
81 delete the record if it is too old
82 **************************************************************************/
83 static int traverse_fn(TDB_CONTEXT
*ttdb
, TDB_DATA kbuf
, TDB_DATA dbuf
, void *state
)
85 struct unexpected_key key
;
87 memcpy(&key
, kbuf
.dptr
, sizeof(key
));
89 if (lastt
- key
.timestamp
> NMBD_UNEXPECTED_TIMEOUT
) {
90 tdb_delete(ttdb
, kbuf
);
97 /****************************************************************************
98 delete all old unexpected packets
99 **************************************************************************/
100 void clear_unexpected(time_t t
)
104 if ((lastt
!= 0) && (t
< lastt
+ NMBD_UNEXPECTED_TIMEOUT
))
109 tdb_traverse(tdbd
, traverse_fn
, NULL
);
113 static struct packet_struct
*matched_packet
;
115 static enum packet_type match_type
;
116 static char *match_name
;
118 /****************************************************************************
119 tdb traversal fn to find a matching 137 packet
120 **************************************************************************/
121 static int traverse_match(TDB_CONTEXT
*ttdb
, TDB_DATA kbuf
, TDB_DATA dbuf
, void *state
)
123 struct unexpected_key key
;
124 struct packet_struct
*p
;
126 memcpy(&key
, kbuf
.dptr
, sizeof(key
));
128 if (key
.packet_type
!= match_type
) return 0;
130 p
= parse_packet(dbuf
.dptr
, dbuf
.dsize
, match_type
);
132 if ((match_type
== NMB_PACKET
&&
133 p
->packet
.nmb
.header
.name_trn_id
== match_id
) ||
134 (match_type
== DGRAM_PACKET
&&
135 match_mailslot_name(p
, match_name
))) {
146 /****************************************************************************
147 check for a particular packet in the unexpected packet queue
148 **************************************************************************/
149 struct packet_struct
*receive_unexpected(enum packet_type packet_type
, int id
,
154 tdb2
= tdb_open(lock_path("unexpected.tdb"), 0, 0, O_RDONLY
, 0);
155 if (!tdb2
) return NULL
;
157 matched_packet
= NULL
;
159 match_type
= packet_type
;
160 match_name
= mailslot_name
;
162 tdb_traverse(tdb2
, traverse_match
, NULL
);
166 return matched_packet
;