2 * Routines for xyplex packet dissection
4 * Copyright 2002 Randy McEoin <rmceoin@pe.com>
6 * $Id: packet-xyplex.c,v 1.2 2002/08/28 21:00:40 jmayer Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
10 * Copyright 1998 Gerald Combs
12 * Copied from packet-tftp.c
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #include <epan/packet.h>
35 #include <epan/conversation.h>
37 static int proto_xyplex = -1;
38 static int hf_xyplex_type = -1;
39 static int hf_xyplex_pad = -1;
40 static int hf_xyplex_server_port = -1;
41 static int hf_xyplex_return_port = -1;
42 static int hf_xyplex_reserved = -1;
43 static int hf_xyplex_reply = -1;
45 static gint ett_xyplex = -1;
47 static dissector_handle_t xyplex_handle;
49 #define UDP_PORT_XYPLEX 173
51 #define XYPLEX_REG_OK 0x00
52 #define XYPLEX_REG_QUEFULL 0x05
54 static const value_string xyplex_reg_vals[] = {
55 { XYPLEX_REG_OK, "OK" },
56 { XYPLEX_REG_QUEFULL, "Queue Full" },
61 dissect_xyplex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
63 proto_tree *xyplex_tree = NULL;
65 conversation_t *conversation;
75 if (check_col(pinfo->cinfo, COL_PROTOCOL))
76 col_set_str(pinfo->cinfo, COL_PROTOCOL, "XYPLEX");
79 ti = proto_tree_add_item(tree, proto_xyplex, tvb, offset, -1, FALSE);
80 xyplex_tree = proto_item_add_subtree(ti, ett_xyplex);
83 if (pinfo->destport == UDP_PORT_XYPLEX) {
84 /* This is a registration request from a Unix server
85 * to the Xyplex server. The server_port indicates
86 * which Xyplex serial port is desired. The
87 * return_port tells the Xyplex server what TCP port
88 * to open to the Unix server.
90 prototype = tvb_get_guint8(tvb, offset);
91 padding = tvb_get_guint8(tvb, offset+1);
92 server_port = tvb_get_ntohs(tvb, offset+2);
93 return_port = tvb_get_ntohs(tvb, offset+4);
94 reserved = tvb_get_ntohs(tvb, offset+6);
95 if (check_col(pinfo->cinfo, COL_INFO)) {
96 col_add_fstr(pinfo->cinfo, COL_INFO,
97 "Registration Request: %d Return: %d",
98 server_port, return_port);
101 proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
102 offset, 1, prototype);
103 proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
104 offset+1, 1, padding);
105 proto_tree_add_uint(xyplex_tree, hf_xyplex_server_port, tvb,
106 offset+2, 2, server_port);
107 proto_tree_add_uint(xyplex_tree, hf_xyplex_return_port, tvb,
108 offset+4, 2, return_port);
109 proto_tree_add_uint(xyplex_tree, hf_xyplex_reserved, tvb,
110 offset+6, 2, reserved);
114 /* Look for all future TCP conversations between the
115 * requestiong server and the Xyplex host using the
118 conversation = find_conversation(&pinfo->src, &pinfo->dst,
119 PT_TCP, return_port, 0, NO_PORT_B);
120 if (conversation == NULL) {
121 conversation = conversation_new(&pinfo->src, &pinfo->dst,
122 PT_TCP, return_port, 0, NO_PORT2);
123 conversation_set_dissector(conversation, xyplex_handle);
128 if (pinfo->srcport == UDP_PORT_XYPLEX) {
129 prototype = tvb_get_guint8(tvb, offset);
130 padding = tvb_get_guint8(tvb, offset+1);
131 reply = tvb_get_ntohs(tvb, offset+2);
132 if (check_col(pinfo->cinfo, COL_INFO)) {
133 col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Reply: %s",
134 val_to_str(reply, xyplex_reg_vals, "Unknown (0x%02x)"));
137 proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
138 offset, 1, prototype);
139 proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
140 offset+1, 1, padding);
141 proto_tree_add_uint(xyplex_tree, hf_xyplex_reply, tvb,
149 * This must be the TCP data stream. This will just be
150 * the raw data being transfered from the remote server
151 * and the Xyplex serial port.
153 if (check_col(pinfo->cinfo, COL_INFO)) {
154 col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Data",
155 pinfo->srcport, pinfo->destport);
158 proto_tree_add_text(xyplex_tree, tvb, offset, -1,
159 "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
165 proto_register_xyplex(void)
167 static hf_register_info hf[] = {
169 { "Type", "xyplex.type",
170 FT_UINT8, BASE_DEC, NULL, 0x0,
171 "Protocol type", HFILL }},
174 { "Pad", "xyplex.pad",
175 FT_UINT8, BASE_DEC, NULL, 0x0,
178 { &hf_xyplex_server_port,
179 { "Server Port", "xyplex.server_port",
180 FT_UINT16, BASE_DEC, NULL, 0x0,
181 "Server port", HFILL }},
183 { &hf_xyplex_return_port,
184 { "Return Port", "xyplex.return_port",
185 FT_UINT16, BASE_DEC, NULL, 0x0,
186 "Return port", HFILL }},
188 { &hf_xyplex_reserved,
189 { "Reserved field", "xyplex.reserved",
190 FT_UINT16, BASE_DEC, NULL, 0x0,
191 "Reserved field", HFILL }},
194 { "Registration Reply", "xyplex.reply",
195 FT_UINT16, BASE_DEC, VALS(xyplex_reg_vals), 0x0,
196 "Registration reply", HFILL }},
199 static gint *ett[] = {
203 proto_xyplex = proto_register_protocol("Xyplex", "XYPLEX", "xyplex");
204 proto_register_field_array(proto_xyplex, hf, array_length(hf));
205 proto_register_subtree_array(ett, array_length(ett));
207 xyplex_handle = create_dissector_handle(dissect_xyplex, proto_xyplex);
211 proto_reg_handoff_xyplex(void)
213 dissector_add("udp.port", UDP_PORT_XYPLEX, xyplex_handle);