forked from osmocom/wireshark
147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/* packet-teimanagement.c
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* Routines for LAPD TEI Management frame disassembly
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* Rolf Fiedler <rolf.fiedler@innoventif.com>
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* based on code by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* $Id: packet-teimanagement.c,v 1.1 2004/01/26 20:48:38 guy Exp $
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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
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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 <glib.h>
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#include <string.h>
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#include <epan/packet.h>
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#include "lapd_sapi.h"
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/* ISDN/LAPD references:
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*
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* http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm
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* http://www.ece.wpi.edu/courses/ee535/hwk11cd95/agrebe/agrebe.html
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* http://www.acacia-net.com/Clarinet/Protocol/q9213o84.htm
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*/
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static int proto_tei=-1;
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static int lm_entity_id=-1;
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static int lm_reference=-1;
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static int lm_message=-1;
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static int lm_action=-1;
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static int lm_extend =-1;
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static gint lm_subtree=-1;
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#define TEI_ID_REQUEST 0x01
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#define TEI_ID_ASSIGNED 0x02
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#define TEI_ID_DENIED 0x03
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#define TEI_ID_CHECK_REQ 0x04
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#define TEI_ID_CHECK_RESP 0x05
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#define TEI_ID_REMOVE 0x06
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#define TEI_ID_VERIFY 0x07
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static const value_string tei_msg_vals[]={
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{ TEI_ID_REQUEST, "Identity Request"},
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{ TEI_ID_ASSIGNED, "Identity Assigned"},
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{ TEI_ID_DENIED, "Identity Denied"},
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{ TEI_ID_CHECK_REQ, "Identity Check Request"},
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{ TEI_ID_CHECK_RESP, "Identity Check Response"},
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{ TEI_ID_REMOVE, "Identity Remove"},
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{ TEI_ID_VERIFY, "Identity Verify"},
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{ 0, NULL}
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};
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static void
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dissect_teimanagement(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *tei_tree = NULL;
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proto_item *tei_ti;
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guint8 message;
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if(check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TEI");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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tei_ti = proto_tree_add_item(tree, proto_tei, tvb, 0, 5, FALSE);
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tei_tree = proto_item_add_subtree(tei_ti, lm_subtree);
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proto_tree_add_item(tei_tree, lm_entity_id, tvb, 0, 1, FALSE);
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proto_tree_add_item(tei_tree, lm_reference, tvb, 1, 2, FALSE);
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}
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message = tvb_get_guint8(tvb, 3);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO,
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val_to_str(message, tei_msg_vals, "Unknown message type (0x%04x)"));
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if (tree) {
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proto_tree_add_uint(tei_tree, lm_message, tvb, 3, 1, message);
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proto_tree_add_item(tei_tree, lm_action, tvb, 4, 1, FALSE);
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proto_tree_add_item(tei_tree, lm_extend, tvb, 4, 1, FALSE);
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}
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}
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void
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proto_register_teimanagement(void)
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{
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static gint *subtree[]={
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&lm_subtree
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};
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static hf_register_info hf[] = {
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{ &lm_entity_id,
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{ "Entity", "tei.entity", FT_UINT8, BASE_HEX, NULL, 0x0,
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"Layer Management Entity Identifier", HFILL }},
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{ &lm_reference,
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{ "Reference", "tei.reference", FT_UINT16, BASE_DEC, NULL, 0x0,
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"Reference Number", HFILL }},
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{ &lm_message,
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{ "Msg", "tei.msg", FT_UINT8, BASE_DEC, VALS(tei_msg_vals), 0x0,
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"Message Type", HFILL }},
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{ &lm_action,
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{ "Action", "tei.action", FT_UINT8, BASE_DEC, NULL, 0xfe,
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"Action Indicator", HFILL }},
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{ &lm_extend,
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{ "Extend", "tei.extend", FT_UINT8, BASE_DEC, NULL, 0x01,
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"Extension Indicator", HFILL }}
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};
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proto_tei = proto_register_protocol("TEI Management Procedure, Channel D (LAPD)",
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"TEI_MANAGEMENT", "tei_management");
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proto_register_field_array (proto_tei, hf, array_length(hf));
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proto_register_subtree_array(subtree, array_length(subtree));
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}
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void
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proto_reg_handoff_teimanagement(void)
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{
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dissector_handle_t teimanagement_handle;
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teimanagement_handle = create_dissector_handle(dissect_teimanagement,
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proto_tei);
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dissector_add("lapd.sapi", LAPD_SAPI_L2, teimanagement_handle);
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}
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