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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
Unix SMB/CIFS implementation.
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 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"
static TDB_CONTEXT *tdbd = NULL;
/* the key type used in the unexpected 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
erroneously 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;
uint32_t enc_ip;
if (!tdbd) {
tdbd = tdb_open_log(lock_path("unexpected.tdb"), 0,
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));
/* Encode the ip addr and port. */
enc_ip = ntohl(p->ip.s_addr);
SIVAL(buf,0,enc_ip);
SSVAL(buf,4,p->port);
len = build_packet(&buf[6], sizeof(buf)-6, p) + 6;
ZERO_STRUCT(key); /* needed for potential alignment */
key.packet_type = p->packet_type;
key.timestamp = p->timestamp;
key.count = count++;
kbuf.dptr = (uint8_t *)&key;
kbuf.dsize = sizeof(key);
dbuf.dptr = (uint8_t *)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;
if (kbuf.dsize != sizeof(key)) {
tdb_delete(ttdb, kbuf);
}
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);
}
struct receive_unexpected_state {
struct packet_struct *matched_packet;
int match_id;
enum packet_type match_type;
const 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 *private_data)
{
struct receive_unexpected_state *state =
(struct receive_unexpected_state *)private_data;
struct unexpected_key key;
struct in_addr ip;
uint32_t enc_ip;
int port;
struct packet_struct *p;
if (kbuf.dsize != sizeof(key)) {
return 0;
}
memcpy(&key, kbuf.dptr, sizeof(key));
if (key.packet_type != state->match_type) return 0;
if (dbuf.dsize < 6) {
return 0;
}
/* Decode the ip addr and port. */
enc_ip = IVAL(dbuf.dptr,0);
ip.s_addr = htonl(enc_ip);
port = SVAL(dbuf.dptr,4);
p = parse_packet((char *)&dbuf.dptr[6],
dbuf.dsize-6,
state->match_type,
ip,
port);
if (!p)
return 0;
if ((state->match_type == NMB_PACKET &&
p->packet.nmb.header.name_trn_id == state->match_id) ||
(state->match_type == DGRAM_PACKET &&
match_mailslot_name(p, state->match_name))) {
state->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,
const char *mailslot_name)
{
TDB_CONTEXT *tdb2;
struct receive_unexpected_state state;
tdb2 = tdb_open_log(lock_path("unexpected.tdb"), 0, 0, O_RDONLY, 0);
if (!tdb2) return NULL;
state.matched_packet = NULL;
state.match_id = id;
state.match_type = packet_type;
state.match_name = mailslot_name;
tdb_traverse(tdb2, traverse_match, &state);
tdb_close(tdb2);
return state.matched_packet;
}
|
