/* packet-xyplex.c * Routines for xyplex packet dissection * * Copyright 2002 Randy McEoin * * $Id: packet-xyplex.c,v 1.2 2002/08/28 21:00:40 jmayer Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from packet-tftp.c * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include static int proto_xyplex = -1; static int hf_xyplex_type = -1; static int hf_xyplex_pad = -1; static int hf_xyplex_server_port = -1; static int hf_xyplex_return_port = -1; static int hf_xyplex_reserved = -1; static int hf_xyplex_reply = -1; static gint ett_xyplex = -1; static dissector_handle_t xyplex_handle; #define UDP_PORT_XYPLEX 173 #define XYPLEX_REG_OK 0x00 #define XYPLEX_REG_QUEFULL 0x05 static const value_string xyplex_reg_vals[] = { { XYPLEX_REG_OK, "OK" }, { XYPLEX_REG_QUEFULL, "Queue Full" }, { 0, NULL } }; static void dissect_xyplex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *xyplex_tree = NULL; proto_item *ti; conversation_t *conversation; gint offset = 0; guint8 prototype; guint8 padding; guint16 server_port; guint16 return_port; guint16 reserved; guint16 reply; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "XYPLEX"); if (tree) { ti = proto_tree_add_item(tree, proto_xyplex, tvb, offset, -1, FALSE); xyplex_tree = proto_item_add_subtree(ti, ett_xyplex); } if (pinfo->destport == UDP_PORT_XYPLEX) { /* This is a registration request from a Unix server * to the Xyplex server. The server_port indicates * which Xyplex serial port is desired. The * return_port tells the Xyplex server what TCP port * to open to the Unix server. */ prototype = tvb_get_guint8(tvb, offset); padding = tvb_get_guint8(tvb, offset+1); server_port = tvb_get_ntohs(tvb, offset+2); return_port = tvb_get_ntohs(tvb, offset+4); reserved = tvb_get_ntohs(tvb, offset+6); if (check_col(pinfo->cinfo, COL_INFO)) { col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Request: %d Return: %d", server_port, return_port); } if (tree) { proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb, offset, 1, prototype); proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb, offset+1, 1, padding); proto_tree_add_uint(xyplex_tree, hf_xyplex_server_port, tvb, offset+2, 2, server_port); proto_tree_add_uint(xyplex_tree, hf_xyplex_return_port, tvb, offset+4, 2, return_port); proto_tree_add_uint(xyplex_tree, hf_xyplex_reserved, tvb, offset+6, 2, reserved); } offset += 8; /* Look for all future TCP conversations between the * requestiong server and the Xyplex host using the * return_port. */ conversation = find_conversation(&pinfo->src, &pinfo->dst, PT_TCP, return_port, 0, NO_PORT_B); if (conversation == NULL) { conversation = conversation_new(&pinfo->src, &pinfo->dst, PT_TCP, return_port, 0, NO_PORT2); conversation_set_dissector(conversation, xyplex_handle); } return; } if (pinfo->srcport == UDP_PORT_XYPLEX) { prototype = tvb_get_guint8(tvb, offset); padding = tvb_get_guint8(tvb, offset+1); reply = tvb_get_ntohs(tvb, offset+2); if (check_col(pinfo->cinfo, COL_INFO)) { col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Reply: %s", val_to_str(reply, xyplex_reg_vals, "Unknown (0x%02x)")); } if (tree) { proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb, offset, 1, prototype); proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb, offset+1, 1, padding); proto_tree_add_uint(xyplex_tree, hf_xyplex_reply, tvb, offset+2, 2, reply); } offset += 4; return; } /* * This must be the TCP data stream. This will just be * the raw data being transfered from the remote server * and the Xyplex serial port. */ if (check_col(pinfo->cinfo, COL_INFO)) { col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Data", pinfo->srcport, pinfo->destport); } if (tree) { proto_tree_add_text(xyplex_tree, tvb, offset, -1, "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset)); } } void proto_register_xyplex(void) { static hf_register_info hf[] = { { &hf_xyplex_type, { "Type", "xyplex.type", FT_UINT8, BASE_DEC, NULL, 0x0, "Protocol type", HFILL }}, { &hf_xyplex_pad, { "Pad", "xyplex.pad", FT_UINT8, BASE_DEC, NULL, 0x0, "Padding", HFILL }}, { &hf_xyplex_server_port, { "Server Port", "xyplex.server_port", FT_UINT16, BASE_DEC, NULL, 0x0, "Server port", HFILL }}, { &hf_xyplex_return_port, { "Return Port", "xyplex.return_port", FT_UINT16, BASE_DEC, NULL, 0x0, "Return port", HFILL }}, { &hf_xyplex_reserved, { "Reserved field", "xyplex.reserved", FT_UINT16, BASE_DEC, NULL, 0x0, "Reserved field", HFILL }}, { &hf_xyplex_reply, { "Registration Reply", "xyplex.reply", FT_UINT16, BASE_DEC, VALS(xyplex_reg_vals), 0x0, "Registration reply", HFILL }}, }; static gint *ett[] = { &ett_xyplex, }; proto_xyplex = proto_register_protocol("Xyplex", "XYPLEX", "xyplex"); proto_register_field_array(proto_xyplex, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); xyplex_handle = create_dissector_handle(dissect_xyplex, proto_xyplex); } void proto_reg_handoff_xyplex(void) { dissector_add("udp.port", UDP_PORT_XYPLEX, xyplex_handle); }