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Diffstat (limited to 'epan/dissectors/packet-xyplex.c')
| -rw-r--r-- | epan/dissectors/packet-xyplex.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/epan/dissectors/packet-xyplex.c b/epan/dissectors/packet-xyplex.c new file mode 100644 index 0000000000..9ad7a58b59 --- /dev/null +++ b/epan/dissectors/packet-xyplex.c @@ -0,0 +1,215 @@ +/* packet-xyplex.c + * Routines for xyplex packet dissection + * + * Copyright 2002 Randy McEoin <rmceoin@pe.com> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 <glib.h> +#include <epan/packet.h> +#include <epan/conversation.h> + +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); +} + |