Initial import

[samba] / source / libsmb / unexpected.c

diff --git a/source/libsmb/unexpected.c b/source/libsmb/unexpected.c
new file mode 100644 (file)
index 0000000..97d6071
--- /dev/null
+++ b/source/libsmb/unexpected.c
@@ -0,0 +1,164 @@
+/* 
+   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;
+
+       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));
+       
+       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;
+
+       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;
+}