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);
116 static struct packet_struct *matched_packet;
118 static enum packet_type match_type;
119 static const char *match_name;
121 /****************************************************************************
122 tdb traversal fn to find a matching 137 packet.
123 **************************************************************************/
125 static int traverse_match(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
127 struct unexpected_key key;
131 struct packet_struct *p;
133 memcpy(&key, kbuf.dptr, sizeof(key));
135 if (key.packet_type != match_type) return 0;
137 if (dbuf.dsize < 6) {
141 /* Decode the ip addr and port. */
142 enc_ip = IVAL(dbuf.dptr,0);
143 ip.s_addr = htonl(enc_ip);
144 port = SVAL(dbuf.dptr,4);
146 p = parse_packet((char *)&dbuf.dptr[6],
152 if ((match_type == NMB_PACKET &&
153 p->packet.nmb.header.name_trn_id == match_id) ||
154 (match_type == DGRAM_PACKET &&
155 match_mailslot_name(p, match_name))) {
165 /****************************************************************************
166 Check for a particular packet in the unexpected packet queue.
167 **************************************************************************/
169 struct packet_struct *receive_unexpected(enum packet_type packet_type, int id,
170 const char *mailslot_name)
174 tdb2 = tdb_open_log(lock_path("unexpected.tdb"), 0, 0, O_RDONLY, 0);
175 if (!tdb2) return NULL;
177 matched_packet = NULL;
179 match_type = packet_type;
180 match_name = mailslot_name;
182 tdb_traverse(tdb2, traverse_match, NULL);
186 return matched_packet;