2 * Routines for laplink dissection
3 * Copyright 2003, Brad Hards <bradh@frogmouth.net>
5 * $Id: packet-laplink.c,v 1.4 2003/10/20 23:05:41 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 #ifdef NEED_SNPRINTF_H
37 # include "snprintf.h"
40 #include <epan/packet.h>
41 #include <epan/strutil.h>
42 #include <epan/conversation.h>
44 #include "packet-tcp.h"
47 #define TCP_PORT_LAPLINK 1547
48 #define UDP_PORT_LAPLINK 1547
50 /* Initialize the protocol and registered fields */
51 static int proto_laplink = -1;
52 static int hf_laplink_udp_ident = -1;
53 static int hf_laplink_udp_name = -1;
54 static int hf_laplink_tcp_ident = -1;
55 static int hf_laplink_tcp_length = -1;
56 static int hf_laplink_tcp_data = -1;
58 /* Initialize the subtree pointers */
59 static gint ett_laplink = -1;
61 static const value_string laplink_udp_magic[] = {
62 { 0x0f010000, "Name Solicitation" },
63 { 0xf0000200, "Name Reply" },
67 static const value_string laplink_tcp_magic[] = {
68 { 0xff08c000, "Unknown TCP query - connection?" },
69 { 0xff08c200, "Unknown TCP query - connection?" },
70 { 0xff0bc000, "Unknown TCP query - connection?" },
71 { 0xff0bc200, "Unknown TCP query - connection?" },
72 { 0xff10c000, "Unknown TCP response - connection?" },
73 { 0xff10c200, "Unknown TCP response - connection?" },
74 { 0xff11c000, "Unknown TCP query/response - directory list or file transfer?" },
75 { 0xff11c200, "Unknown TCP query - directory list or file request?" },
76 { 0xff13c000, "Unknown TCP response - connection?" },
77 { 0xff13c200, "Unknown TCP response - connection?" },
78 { 0xff14c000, "Unknown TCP response - directory list or file transfer?" },
82 static gboolean laplink_desegment = TRUE;
84 /* Code to actually dissect the packets - UDP */
86 dissect_laplink_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
90 proto_tree *laplink_tree;
92 gchar *udp_ident_string;
95 * Make sure the identifier is reasonable.
97 if (!tvb_bytes_exist(tvb, offset, 4))
98 return 0; /* not enough bytes to check */
99 udp_ident = tvb_get_ntohl(tvb, offset);
100 udp_ident_string = match_strval(udp_ident, laplink_udp_magic);
101 if (udp_ident_string == NULL)
102 return 0; /* unknown */
104 /* Make entries in Protocol column and Info column on summary display */
105 if (check_col(pinfo->cinfo, COL_PROTOCOL))
106 col_set_str(pinfo->cinfo, COL_PROTOCOL, "Laplink");
108 if (check_col(pinfo->cinfo, COL_INFO))
109 col_add_str(pinfo->cinfo, COL_INFO, udp_ident_string);
112 ti = proto_tree_add_item(tree, proto_laplink, tvb, 0, -1, FALSE);
113 laplink_tree = proto_item_add_subtree(ti, ett_laplink);
115 proto_tree_add_uint(laplink_tree, hf_laplink_udp_ident, tvb, offset, 4, udp_ident);
118 proto_tree_add_item(laplink_tree, hf_laplink_udp_name, tvb, offset, -1, FALSE);
120 return tvb_length(tvb);
123 /* Code to actually dissect the packets - TCP aspects*/
125 dissect_laplink_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
130 proto_tree *laplink_tree;
133 /* Make entries in Protocol column and Info column on summary display */
134 if (check_col(pinfo->cinfo, COL_PROTOCOL))
135 col_set_str(pinfo->cinfo, COL_PROTOCOL, "Laplink");
137 tcp_ident = tvb_get_ntohl(tvb, offset);
138 if (check_col(pinfo->cinfo, COL_INFO)) {
139 col_add_str(pinfo->cinfo, COL_INFO,
140 val_to_str(tcp_ident, laplink_tcp_magic, "TCP TBA (%u)"));
144 ti = proto_tree_add_item(tree, proto_laplink, tvb, 0, -1, FALSE);
147 laplink_tree = proto_item_add_subtree(ti, ett_laplink);
149 proto_tree_add_item(laplink_tree, hf_laplink_tcp_ident, tvb, offset, 4, FALSE);
152 length = tvb_get_ntohs(tvb, offset);
153 proto_tree_add_item(laplink_tree, hf_laplink_tcp_length, tvb, offset, 2, FALSE);
156 proto_tree_add_item(laplink_tree, hf_laplink_tcp_data, tvb, offset, length, FALSE);
158 /* Continue adding tree items to process the packet here */
162 /* If this protocol has a sub-dissector call it here, see section 1.8 */
166 get_laplink_pdu_len(tvbuff_t *tvb, int offset)
170 * The length doesn't include the length or ident fields; add those in.
172 plen = (tvb_get_ntohs(tvb, offset+4) + 2 + 4);
177 dissect_laplink_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
179 tcp_dissect_pdus(tvb, pinfo, tree, laplink_desegment,
180 6, get_laplink_pdu_len,
181 dissect_laplink_tcp_pdu);
185 /* Register the protocol with Ethereal */
188 proto_register_laplink(void)
191 /* Setup list of header fields See Section 1.6.1 for details*/
192 static hf_register_info hf[] = {
193 { &hf_laplink_udp_ident,
194 { "UDP Ident", "laplink.udp_ident",
195 FT_UINT32, BASE_HEX, VALS(laplink_udp_magic), 0x0,
196 "Unknown magic", HFILL }
198 { &hf_laplink_udp_name,
199 { "UDP Name", "laplink.udp_name",
200 FT_STRINGZ, BASE_NONE, NULL, 0x0,
201 "Machine name", HFILL }
203 { &hf_laplink_tcp_ident,
204 { "TCP Ident", "laplink.tcp_ident",
205 FT_UINT32, BASE_HEX, VALS(laplink_tcp_magic), 0x0,
206 "Unknown magic", HFILL }
208 { &hf_laplink_tcp_length,
209 { "TCP Data payload length", "laplink.tcp_length",
210 FT_UINT16, BASE_DEC, NULL, 0x0,
211 "Length of remaining payload", HFILL }
213 { &hf_laplink_tcp_data,
214 { "Unknown TCP data", "laplink.tcp_data",
215 FT_BYTES, BASE_HEX, NULL, 0x0,
220 /* Setup protocol subtree array */
221 static gint *ett[] = {
225 module_t *laplink_module;
227 /* Register the protocol name and description */
228 proto_laplink = proto_register_protocol("Laplink",
229 "Laplink", "laplink");
231 /* Required function calls to register the header fields and subtrees used */
232 proto_register_field_array(proto_laplink, hf, array_length(hf));
233 proto_register_subtree_array(ett, array_length(ett));
235 laplink_module = prefs_register_protocol(proto_laplink, NULL);
236 prefs_register_bool_preference(laplink_module, "desegment_laplink_over_tcp",
237 "Desegment all Laplink-over-TCP messages",
238 "Whether the Laplink dissector should desegment all Laplink-over-TCP messages",
243 /* If this dissector uses sub-dissector registration add a registration routine.
244 This format is required because a script is used to find these routines and
245 create the code that calls these routines.
248 proto_reg_handoff_laplink(void)
250 dissector_handle_t laplink_udp_handle;
251 dissector_handle_t laplink_tcp_handle;
253 laplink_tcp_handle = create_dissector_handle(dissect_laplink_tcp,
255 dissector_add("tcp.port", TCP_PORT_LAPLINK, laplink_tcp_handle);
257 laplink_udp_handle = new_create_dissector_handle(dissect_laplink_udp,
259 dissector_add("udp.port", UDP_PORT_LAPLINK, laplink_udp_handle);