forked from osmocom/wireshark
f331077a60
while this should improve performance by unmeasurably little it does have the sideeffect that once we finish the rewrite tcp analysis might actually work and work well even for tcp over tcp tunnelling. this also means that if you include packet-tcp.h you also need to include emem.h . svn path=/trunk/; revision=17681
260 lines
7.8 KiB
C
260 lines
7.8 KiB
C
/* packet-laplink.c
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* Routines for laplink dissection
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* Copyright 2003, Brad Hards <bradh@frogmouth.net>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/conversation.h>
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#include <epan/emem.h>
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#include "packet-tcp.h"
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#include <epan/prefs.h>
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#define TCP_PORT_LAPLINK 1547
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#define UDP_PORT_LAPLINK 1547
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/* Initialize the protocol and registered fields */
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static int proto_laplink = -1;
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static int hf_laplink_udp_ident = -1;
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static int hf_laplink_udp_name = -1;
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static int hf_laplink_tcp_ident = -1;
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static int hf_laplink_tcp_length = -1;
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static int hf_laplink_tcp_data = -1;
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/* Initialize the subtree pointers */
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static gint ett_laplink = -1;
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static const value_string laplink_udp_magic[] = {
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{ 0x0f010000, "Name Solicitation" },
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{ 0xf0000200, "Name Reply" },
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{ 0, NULL }
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};
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static const value_string laplink_tcp_magic[] = {
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{ 0xff08c000, "Unknown TCP query - connection?" },
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{ 0xff08c200, "Unknown TCP query - connection?" },
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{ 0xff0bc000, "Unknown TCP query - connection?" },
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{ 0xff0bc200, "Unknown TCP query - connection?" },
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{ 0xff10c000, "Unknown TCP response - connection?" },
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{ 0xff10c200, "Unknown TCP response - connection?" },
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{ 0xff11c000, "Unknown TCP query/response - directory list or file transfer?" },
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{ 0xff11c200, "Unknown TCP query - directory list or file request?" },
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{ 0xff13c000, "Unknown TCP response - connection?" },
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{ 0xff13c200, "Unknown TCP response - connection?" },
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{ 0xff14c000, "Unknown TCP response - directory list or file transfer?" },
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{ 0, NULL }
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};
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static gboolean laplink_desegment = TRUE;
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/* Code to actually dissect the packets - UDP */
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static gint
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dissect_laplink_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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proto_item *ti;
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proto_tree *laplink_tree;
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guint32 udp_ident;
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const gchar *udp_ident_string;
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/*
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* Make sure the identifier is reasonable.
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*/
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if (!tvb_bytes_exist(tvb, offset, 4))
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return 0; /* not enough bytes to check */
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udp_ident = tvb_get_ntohl(tvb, offset);
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udp_ident_string = match_strval(udp_ident, laplink_udp_magic);
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if (udp_ident_string == NULL)
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return 0; /* unknown */
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Laplink");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_str(pinfo->cinfo, COL_INFO, udp_ident_string);
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if (tree){
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ti = proto_tree_add_item(tree, proto_laplink, tvb, 0, -1, FALSE);
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laplink_tree = proto_item_add_subtree(ti, ett_laplink);
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proto_tree_add_uint(laplink_tree, hf_laplink_udp_ident, tvb, offset, 4, udp_ident);
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offset += 4;
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proto_tree_add_item(laplink_tree, hf_laplink_udp_name, tvb, offset, -1, FALSE);
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}
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return tvb_length(tvb);
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}
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/* Code to actually dissect the packets - TCP aspects*/
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static void
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dissect_laplink_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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int length = 0;
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proto_item *ti;
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proto_tree *laplink_tree;
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guint32 tcp_ident;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Laplink");
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tcp_ident = tvb_get_ntohl(tvb, offset);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(tcp_ident, laplink_tcp_magic, "TCP TBA (%u)"));
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}
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if (tree){
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ti = proto_tree_add_item(tree, proto_laplink, tvb, 0, -1, FALSE);
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laplink_tree = proto_item_add_subtree(ti, ett_laplink);
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proto_tree_add_item(laplink_tree, hf_laplink_tcp_ident, tvb, offset, 4, FALSE);
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offset += 4;
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length = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(laplink_tree, hf_laplink_tcp_length, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(laplink_tree, hf_laplink_tcp_data, tvb, offset, length, FALSE);
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/* Continue adding tree items to process the packet here */
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}
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/* If this protocol has a sub-dissector call it here, see section 1.8 */
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}
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static guint
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get_laplink_pdu_len(tvbuff_t *tvb, int offset)
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{
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guint plen;
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/*
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* The length doesn't include the length or ident fields; add those in.
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*/
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plen = (tvb_get_ntohs(tvb, offset+4) + 2 + 4);
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return plen;
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}
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static void
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dissect_laplink_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, laplink_desegment,
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6, get_laplink_pdu_len,
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dissect_laplink_tcp_pdu);
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}
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/* Register the protocol with Ethereal */
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void
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proto_register_laplink(void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_laplink_udp_ident,
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{ "UDP Ident", "laplink.udp_ident",
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FT_UINT32, BASE_HEX, VALS(laplink_udp_magic), 0x0,
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"Unknown magic", HFILL }
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},
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{ &hf_laplink_udp_name,
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{ "UDP Name", "laplink.udp_name",
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FT_STRINGZ, BASE_NONE, NULL, 0x0,
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"Machine name", HFILL }
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},
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{ &hf_laplink_tcp_ident,
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{ "TCP Ident", "laplink.tcp_ident",
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FT_UINT32, BASE_HEX, VALS(laplink_tcp_magic), 0x0,
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"Unknown magic", HFILL }
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},
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{ &hf_laplink_tcp_length,
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{ "TCP Data payload length", "laplink.tcp_length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Length of remaining payload", HFILL }
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},
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{ &hf_laplink_tcp_data,
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{ "Unknown TCP data", "laplink.tcp_data",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"TCP data", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_laplink,
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};
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module_t *laplink_module;
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/* Register the protocol name and description */
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proto_laplink = proto_register_protocol("Laplink",
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"Laplink", "laplink");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_laplink, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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laplink_module = prefs_register_protocol(proto_laplink, NULL);
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prefs_register_bool_preference(laplink_module, "desegment_laplink_over_tcp",
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"Reassemble Laplink over TCP messages spanning multiple TCP segments",
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"Whether the Laplink dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&laplink_desegment);
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_laplink(void)
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{
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dissector_handle_t laplink_udp_handle;
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dissector_handle_t laplink_tcp_handle;
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laplink_tcp_handle = create_dissector_handle(dissect_laplink_tcp,
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proto_laplink);
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dissector_add("tcp.port", TCP_PORT_LAPLINK, laplink_tcp_handle);
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laplink_udp_handle = new_create_dissector_handle(dissect_laplink_udp,
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proto_laplink);
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dissector_add("udp.port", UDP_PORT_LAPLINK, laplink_udp_handle);
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}
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