2 * Routines for X25 over TCP dissection (RFC 1613)
4 * Copyright 2000, Paul Ionescu <paul@acorp.ro>
6 * $Id: packet-xot.c,v 1.6 2001/09/13 08:05:26 guy Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@zing.org>
10 * Copyright 1998 Gerald Combs
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
40 #define TCP_PORT_XOT 1998
42 static gint proto_xot = -1;
43 static gint hf_xot_version = -1;
44 static gint hf_xot_length = -1;
46 static gint ett_xot = -1;
48 static dissector_handle_t x25_handle;
50 static void dissect_xot(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
57 if (check_col(pinfo->fd, COL_PROTOCOL))
58 col_set_str(pinfo->fd, COL_PROTOCOL, "XOT");
59 if (check_col(pinfo->fd, COL_INFO))
60 col_clear(pinfo->fd, COL_INFO);
62 version = tvb_get_ntohs(tvb,0);
63 len = tvb_get_ntohs(tvb,2);
65 if (check_col(pinfo->fd, COL_INFO))
66 col_add_fstr(pinfo->fd, COL_INFO, "XOT Version = %u, size = %u",version,len );
70 ti = proto_tree_add_protocol_format(tree, proto_xot, tvb, 0, 4, "X.25 over TCP");
71 xot_tree = proto_item_add_subtree(ti, ett_xot);
73 proto_tree_add_uint(xot_tree, hf_xot_version, tvb, 0, 2, version);
74 proto_tree_add_uint(xot_tree, hf_xot_length, tvb, 2, 2, len);
77 next_tvb = tvb_new_subset(tvb,4, -1 , -1);
78 call_dissector(x25_handle,next_tvb,pinfo,tree);
81 /* Register the protocol with Ethereal */
83 proto_register_xot(void)
85 static hf_register_info hf[] = {
87 { "Version", "xot.version", FT_UINT16, BASE_DEC,
88 NULL, 0, "Version of X.25 over TCP protocol", HFILL }},
91 { "Length", "xot.length", FT_UINT16, BASE_DEC,
92 NULL, 0, "Length of X.25 over TCP packet", HFILL }}
96 static gint *ett[] = {
100 proto_xot = proto_register_protocol("X.25 over TCP", "XOT", "xot");
101 proto_register_field_array(proto_xot, hf, array_length(hf));
102 proto_register_subtree_array(ett, array_length(ett));
106 proto_reg_handoff_xot(void)
109 * Get a handle for the X.25 dissector.
111 x25_handle = find_dissector("x.25");
113 dissector_add("tcp.port", TCP_PORT_XOT, dissect_xot, proto_xot);