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 3 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, see <http://www.gnu.org/licenses/>.
23 static TDB_CONTEXT *tdbd = NULL;
25 /* the key type used in the unexpeceted packet database */
26 struct unexpected_key {
27 enum packet_type packet_type;
32 /****************************************************************************
33 All unexpected packets are passed in here, to be stored in a unexpected
34 packet database. This allows nmblookup and other tools to receive packets
35 erroneoously sent to the wrong port by broken MS systems.
36 **************************************************************************/
38 void unexpected_packet(struct packet_struct *p)
42 struct unexpected_key key;
48 tdbd = tdb_open_log(lock_path("unexpected.tdb"), 0,
49 TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
50 O_RDWR | O_CREAT, 0644);
52 DEBUG(0,("Failed to open unexpected.tdb\n"));
57 memset(buf,'\0',sizeof(buf));
59 /* Encode the ip addr and port. */
60 enc_ip = ntohl(p->ip.s_addr);
64 len = build_packet(&buf[6], sizeof(buf)-6, p) + 6;
66 key.packet_type = p->packet_type;
67 key.timestamp = p->timestamp;
70 kbuf.dptr = (uint8_t *)&key;
71 kbuf.dsize = sizeof(key);
72 dbuf.dptr = (uint8_t *)buf;
75 tdb_store(tdbd, kbuf, dbuf, TDB_REPLACE);
81 /****************************************************************************
82 Delete the record if it is too old.
83 **************************************************************************/
85 static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
87 struct unexpected_key key;
89 memcpy(&key, kbuf.dptr, sizeof(key));
91 if (lastt - key.timestamp > NMBD_UNEXPECTED_TIMEOUT) {
92 tdb_delete(ttdb, kbuf);
99 /****************************************************************************
100 Delete all old unexpected packets.
101 **************************************************************************/
103 void clear_unexpected(time_t t)
107 if ((lastt != 0) && (t < lastt + NMBD_UNEXPECTED_TIMEOUT))
112 tdb_traverse(tdbd, traverse_fn, NULL);
115 struct receive_unexpected_state {
116 struct packet_struct *matched_packet;
118 enum packet_type match_type;
119 const char *match_name;
122 /****************************************************************************
123 tdb traversal fn to find a matching 137 packet.
124 **************************************************************************/
126 static int traverse_match(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf,
129 struct receive_unexpected_state *state =
130 (struct receive_unexpected_state *)private_data;
131 struct unexpected_key key;
135 struct packet_struct *p;
137 memcpy(&key, kbuf.dptr, sizeof(key));
139 if (key.packet_type != state->match_type) return 0;
141 if (dbuf.dsize < 6) {
145 /* Decode the ip addr and port. */
146 enc_ip = IVAL(dbuf.dptr,0);
147 ip.s_addr = htonl(enc_ip);
148 port = SVAL(dbuf.dptr,4);
150 p = parse_packet((char *)&dbuf.dptr[6],
156 if ((state->match_type == NMB_PACKET &&
157 p->packet.nmb.header.name_trn_id == state->match_id) ||
158 (state->match_type == DGRAM_PACKET &&
159 match_mailslot_name(p, state->match_name))) {
160 state->matched_packet = p;
169 /****************************************************************************
170 Check for a particular packet in the unexpected packet queue.
171 **************************************************************************/
173 struct packet_struct *receive_unexpected(enum packet_type packet_type, int id,
174 const char *mailslot_name)
177 struct receive_unexpected_state state;
179 tdb2 = tdb_open_log(lock_path("unexpected.tdb"), 0, 0, O_RDONLY, 0);
180 if (!tdb2) return NULL;
182 state.matched_packet = NULL;
184 state.match_type = packet_type;
185 state.match_name = mailslot_name;
187 tdb_traverse(tdb2, traverse_match, &state);
191 return state.matched_packet;