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Do some simple sanity checking of TNS data before dissecting it. 

svn path=/trunk/; revision=6912
This commit is contained in:
Guy Harris 2003-01-11 09:57:16 +00:00
parent 01d8f31347
commit 4a12e2d45d
1 changed files with 20 additions and 3 deletions
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23
packet-tns.c
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@ -1,7 +1,7 @@
/* packet-tns.c
* Routines for Oracle TNS packet dissection
*
* $Id: packet-tns.c,v 1.36 2002/08/28 21:00:36 jmayer Exp $
* $Id: packet-tns.c,v 1.37 2003/01/11 09:57:16 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -849,11 +849,28 @@ get_tns_pdu_len(tvbuff_t *tvb, int offset)
return tvb_get_ntohs(tvb, offset);
}
static void
static int
dissect_tns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 type;
/*
* First, do a sanity check to make sure what we have
* starts with a TNS PDU.
*/
if (tvb_bytes_exist(tvb, 4, 1)) {
/*
* Well, we have the packet type; let's make sure
* it's a known type.
*/
type = tvb_get_guint8(tvb, 4);
if (type < TNS_TYPE_CONNECT || type > TNS_TYPE_MAX)
return 0; /* it's not a known type */
}
tcp_dissect_pdus(tvb, pinfo, tree, tns_desegment, 2,
get_tns_pdu_len, dissect_tns_pdu);
return tvb_length(tvb);
}
static void
@ -1311,7 +1328,7 @@ proto_reg_handoff_tns(void)
{
dissector_handle_t tns_handle;
tns_handle = create_dissector_handle(dissect_tns, proto_tns);
tns_handle = new_create_dissector_handle(dissect_tns, proto_tns);
dissector_add("tcp.port", TCP_PORT_TNS, tns_handle);
data_handle = find_dissector("data");
}