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Reject UDP packets that don't start with a known identification value. 

svn path=/trunk/; revision=8390
This commit is contained in:
Guy Harris 2003-09-05 08:44:52 +00:00
parent 10b364c56d
commit ceb390bd7c
1 changed files with 19 additions and 10 deletions
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29
packet-laplink.c
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@ -2,7 +2,7 @@
* Routines for laplink dissection
* Copyright 2003, Brad Hards <bradh@frogmouth.net>
*
* $Id: packet-laplink.c,v 1.1 2003/07/24 20:22:50 guy Exp $
* $Id: packet-laplink.c,v 1.2 2003/09/05 08:44:52 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -76,33 +76,42 @@ static const value_string laplink_tcp_magic[] = {
};
/* Code to actually dissect the packets - UDP */
static void
static gint
dissect_laplink_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
proto_item *ti;
proto_tree *laplink_tree;
guint32 udp_ident;
gchar *udp_ident_string;
/*
* Make sure the identifier is reasonable.
*/
if (!tvb_bytes_exist(tvb, offset, 4))
return 0; /* not enough bytes to check */
udp_ident = tvb_get_ntohl(tvb, offset);
udp_ident_string = match_strval(udp_ident, laplink_udp_magic);
if (udp_ident_string == NULL)
return 0; /* unknown */
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Laplink");
udp_ident = tvb_get_ntohl(tvb, offset);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(udp_ident, laplink_udp_magic, "Unknown UDP (%u)"));
}
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, udp_ident_string);
if (tree){
ti = proto_tree_add_item(tree, proto_laplink, tvb, 0, -1, FALSE);
laplink_tree = proto_item_add_subtree(ti, ett_laplink);
proto_tree_add_item(laplink_tree, hf_laplink_udp_ident, tvb, offset, 4, FALSE);
offset =+ 4;
proto_tree_add_uint(laplink_tree, hf_laplink_udp_ident, tvb, offset, 4, udp_ident);
offset += 4;
proto_tree_add_item(laplink_tree, hf_laplink_udp_name, tvb, offset, -1, FALSE);
}
return tvb_length(tvb);
}
/* Code to actually dissect the packets - TCP aspects*/
@ -214,7 +223,7 @@ proto_reg_handoff_laplink(void)
proto_laplink);
dissector_add("tcp.port", TCP_PORT_LAPLINK, laplink_tcp_handle);
laplink_udp_handle = create_dissector_handle(dissect_laplink_udp,
laplink_udp_handle = new_create_dissector_handle(dissect_laplink_udp,
proto_laplink);
dissector_add("udp.port", UDP_PORT_LAPLINK, laplink_udp_handle);
}