1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
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 *tdbd = NULL;
/* 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 (!tdbd) {
tdbd = tdb_open_log(lock_path("unexpected.tdb"), 1,
TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
O_RDWR | O_CREAT, 0644);
if (!tdbd) {
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(tdbd, 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, void *state)
{
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 (!tdbd) return;
if ((lastt != 0) && (t < lastt + NMBD_UNEXPECTED_TIMEOUT))
return;
lastt = t;
tdb_traverse(tdbd, traverse_fn, NULL);
}
static struct packet_struct *matched_packet;
static int match_id;
static enum packet_type match_type;
static char *match_name;
/****************************************************************************
tdb traversal fn to find a matching 137 packet
**************************************************************************/
static int traverse_match(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
{
struct unexpected_key key;
struct packet_struct *p;
memcpy(&key, kbuf.dptr, sizeof(key));
if (key.packet_type != match_type) return 0;
p = parse_packet(dbuf.dptr, dbuf.dsize, match_type);
if ((match_type == NMB_PACKET &&
p->packet.nmb.header.name_trn_id == match_id) ||
(match_type == DGRAM_PACKET &&
match_mailslot_name(p, match_name))) {
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(enum packet_type packet_type, int id,
char *mailslot_name)
{
TDB_CONTEXT *tdb2;
tdb2 = tdb_open_log(lock_path("unexpected.tdb"), 0, 0, O_RDONLY, 0);
if (!tdb2) return NULL;
matched_packet = NULL;
match_id = id;
match_type = packet_type;
match_name = mailslot_name;
tdb_traverse(tdb2, traverse_match, NULL);
tdb_close(tdb2);
return matched_packet;
}
|
