forked from osmocom/wireshark
142 lines
4.2 KiB
C
142 lines
4.2 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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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/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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void proto_reg_handoff_teimanagement(void);
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void proto_register_teimanagement(void);
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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 int
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dissect_teimanagement(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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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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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TEI");
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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, ENC_NA);
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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, ENC_BIG_ENDIAN);
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proto_tree_add_item(tei_tree, lm_reference, tvb, 1, 2, ENC_BIG_ENDIAN);
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}
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message = tvb_get_guint8(tvb, 3);
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col_add_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, ENC_BIG_ENDIAN);
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proto_tree_add_item(tei_tree, lm_extend, tvb, 4, 1, ENC_BIG_ENDIAN);
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}
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return tvb_captured_length(tvb);
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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_uint("lapd.sapi", LAPD_SAPI_L2, teimanagement_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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