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/*
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 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"
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;
TALLOC_CTX *mem_ctx;
if (!tdbd) {
mem_ctx = talloc_init("receive_unexpected");
if (!mem_ctx) return;
tdbd = tdb_open_log(lock_path(mem_ctx, "unexpected.tdb"), 0,
TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
O_RDWR | O_CREAT, 0644);
talloc_destroy(mem_ctx);
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 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 *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,
const char *mailslot_name)
{
TDB_CONTEXT *tdb2;
TALLOC_CTX *mem_ctx;
mem_ctx = talloc_init("receive_unexpected");
if (!mem_ctx) return NULL;
tdb2 = tdb_open_log(lock_path(mem_ctx, "unexpected.tdb"), 0, 0, O_RDONLY, 0);
talloc_destroy(mem_ctx);
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;
}
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