forked from osmocom/wireshark
ffa7320de2
svn path=/trunk/; revision=26280
215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
/* packet-xyplex.c
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* Routines for xyplex packet dissection
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*
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* Copyright 2002 Randy McEoin <rmceoin@pe.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-tftp.c
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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static int proto_xyplex = -1;
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static int hf_xyplex_type = -1;
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static int hf_xyplex_pad = -1;
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static int hf_xyplex_server_port = -1;
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static int hf_xyplex_return_port = -1;
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static int hf_xyplex_reserved = -1;
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static int hf_xyplex_reply = -1;
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static gint ett_xyplex = -1;
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static dissector_handle_t xyplex_handle;
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#define UDP_PORT_XYPLEX 173
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#define XYPLEX_REG_OK 0x00
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#define XYPLEX_REG_QUEFULL 0x05
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static const value_string xyplex_reg_vals[] = {
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{ XYPLEX_REG_OK, "OK" },
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{ XYPLEX_REG_QUEFULL, "Queue Full" },
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{ 0, NULL }
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};
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static void
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dissect_xyplex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *xyplex_tree = NULL;
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proto_item *ti;
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conversation_t *conversation;
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gint offset = 0;
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guint8 prototype;
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guint8 padding;
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guint16 server_port;
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guint16 return_port;
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guint16 reserved;
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guint16 reply;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "XYPLEX");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_xyplex, tvb, offset, -1, FALSE);
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xyplex_tree = proto_item_add_subtree(ti, ett_xyplex);
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}
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if (pinfo->destport == UDP_PORT_XYPLEX) {
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/* This is a registration request from a Unix server
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* to the Xyplex server. The server_port indicates
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* which Xyplex serial port is desired. The
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* return_port tells the Xyplex server what TCP port
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* to open to the Unix server.
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*/
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prototype = tvb_get_guint8(tvb, offset);
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padding = tvb_get_guint8(tvb, offset+1);
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server_port = tvb_get_ntohs(tvb, offset+2);
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return_port = tvb_get_ntohs(tvb, offset+4);
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reserved = tvb_get_ntohs(tvb, offset+6);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"Registration Request: %d Return: %d",
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server_port, return_port);
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}
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if (tree) {
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proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
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offset, 1, prototype);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
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offset+1, 1, padding);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_server_port, tvb,
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offset+2, 2, server_port);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_return_port, tvb,
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offset+4, 2, return_port);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_reserved, tvb,
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offset+6, 2, reserved);
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}
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offset += 8;
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/* Look for all future TCP conversations between the
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* requestiong server and the Xyplex host using the
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* return_port.
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*/
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conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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PT_TCP, return_port, 0, NO_PORT_B);
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if (conversation == NULL) {
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conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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PT_TCP, return_port, 0, NO_PORT2);
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conversation_set_dissector(conversation, xyplex_handle);
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}
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return;
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}
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if (pinfo->srcport == UDP_PORT_XYPLEX) {
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prototype = tvb_get_guint8(tvb, offset);
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padding = tvb_get_guint8(tvb, offset+1);
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reply = tvb_get_ntohs(tvb, offset+2);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Reply: %s",
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val_to_str(reply, xyplex_reg_vals, "Unknown (0x%02x)"));
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}
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if (tree) {
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proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
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offset, 1, prototype);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
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offset+1, 1, padding);
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proto_tree_add_uint(xyplex_tree, hf_xyplex_reply, tvb,
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offset+2, 2, reply);
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}
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offset += 4;
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return;
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}
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/*
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* This must be the TCP data stream. This will just be
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* the raw data being transfered from the remote server
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* and the Xyplex serial port.
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*/
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Data",
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pinfo->srcport, pinfo->destport);
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}
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if (tree) {
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proto_tree_add_text(xyplex_tree, tvb, offset, -1,
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"Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
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}
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}
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void
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proto_register_xyplex(void)
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{
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static hf_register_info hf[] = {
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{ &hf_xyplex_type,
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{ "Type", "xyplex.type",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Protocol type", HFILL }},
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{ &hf_xyplex_pad,
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{ "Pad", "xyplex.pad",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Padding", HFILL }},
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{ &hf_xyplex_server_port,
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{ "Server Port", "xyplex.server_port",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Server port", HFILL }},
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{ &hf_xyplex_return_port,
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{ "Return Port", "xyplex.return_port",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Return port", HFILL }},
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{ &hf_xyplex_reserved,
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{ "Reserved field", "xyplex.reserved",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Reserved field", HFILL }},
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{ &hf_xyplex_reply,
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{ "Registration Reply", "xyplex.reply",
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FT_UINT16, BASE_DEC, VALS(xyplex_reg_vals), 0x0,
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"Registration reply", HFILL }},
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};
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static gint *ett[] = {
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&ett_xyplex,
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};
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proto_xyplex = proto_register_protocol("Xyplex", "XYPLEX", "xyplex");
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proto_register_field_array(proto_xyplex, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_xyplex(void)
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{
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xyplex_handle = create_dissector_handle(dissect_xyplex, proto_xyplex);
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dissector_add("udp.port", UDP_PORT_XYPLEX, xyplex_handle);
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}
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