epan/dissectors/packet-teimanagement.c

   1 /* packet-teimanagement.c
   2  * Routines for LAPD TEI Management frame disassembly
   3  * Rolf Fiedler <rolf.fiedler@innoventif.com>
   4  * based on code by Gilbert Ramirez <gram@alumni.rice.edu>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <glib.h>
  28 #include <epan/packet.h>
  29 #include <epan/lapd_sapi.h>
  30
  31 /* ISDN/LAPD references:
  32  *
  33  * http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm
  34  * http://www.ece.wpi.edu/courses/ee535/hwk11cd95/agrebe/agrebe.html
  35  * http://www.acacia-net.com/Clarinet/Protocol/q9213o84.htm
  36  */
  37
  38 void proto_reg_handoff_teimanagement(void);
  39 void proto_register_teimanagement(void);
  40
  41 static int proto_tei=-1;
  42
  43 static int lm_entity_id=-1;
  44 static int lm_reference=-1;
  45 static int lm_message=-1;
  46 static int lm_action=-1;
  47 static int lm_extend =-1;
  48 static gint lm_subtree=-1;
  49
  50 #define TEI_ID_REQUEST    0x01
  51 #define TEI_ID_ASSIGNED   0x02
  52 #define TEI_ID_DENIED     0x03
  53 #define TEI_ID_CHECK_REQ  0x04
  54 #define TEI_ID_CHECK_RESP 0x05
  55 #define TEI_ID_REMOVE     0x06
  56 #define TEI_ID_VERIFY     0x07
  57
  58 static const value_string tei_msg_vals[]={
  59     { TEI_ID_REQUEST,    "Identity Request"},
  60     { TEI_ID_ASSIGNED,   "Identity Assigned"},
  61     { TEI_ID_DENIED,     "Identity Denied"},
  62     { TEI_ID_CHECK_REQ,  "Identity Check Request"},
  63     { TEI_ID_CHECK_RESP, "Identity Check Response"},
  64     { TEI_ID_REMOVE,     "Identity Remove"},
  65     { TEI_ID_VERIFY,     "Identity Verify"},
  66     { 0, NULL}
  67 };
  68
  69 static void
  70 dissect_teimanagement(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  71 {
  72     proto_tree *tei_tree = NULL;
  73     proto_item *tei_ti;
  74     guint8 message;
  75
  76     col_set_str(pinfo->cinfo, COL_PROTOCOL, "TEI");
  77     col_clear(pinfo->cinfo, COL_INFO);
  78
  79     if (tree) {
  80         tei_ti = proto_tree_add_item(tree, proto_tei, tvb, 0, 5, ENC_NA);
  81         tei_tree = proto_item_add_subtree(tei_ti, lm_subtree);
  82
  83         proto_tree_add_item(tei_tree, lm_entity_id, tvb, 0, 1, ENC_BIG_ENDIAN);
  84         proto_tree_add_item(tei_tree, lm_reference,  tvb, 1, 2, ENC_BIG_ENDIAN);
  85     }
  86
  87     message = tvb_get_guint8(tvb, 3);
  88         col_add_str(pinfo->cinfo, COL_INFO,
  89             val_to_str(message, tei_msg_vals, "Unknown message type (0x%04x)"));
  90     if (tree) {
  91         proto_tree_add_uint(tei_tree, lm_message, tvb, 3, 1, message);
  92         proto_tree_add_item(tei_tree, lm_action, tvb, 4, 1, ENC_BIG_ENDIAN);
  93         proto_tree_add_item(tei_tree, lm_extend, tvb, 4, 1, ENC_BIG_ENDIAN);
  94     }
  95 }
  96
  97 void
  98 proto_register_teimanagement(void)
  99 {
 100     static gint *subtree[]={
 101         &lm_subtree
 102     };
 103
 104     static hf_register_info hf[] = {
 105         { &lm_entity_id,
 106           { "Entity", "tei.entity", FT_UINT8, BASE_HEX, NULL, 0x0,
 107                 "Layer Management Entity Identifier", HFILL }},
 108
 109         { &lm_reference,
 110           { "Reference", "tei.reference", FT_UINT16, BASE_DEC, NULL, 0x0,
 111                 "Reference Number", HFILL }},
 112
 113         { &lm_message,
 114           { "Msg", "tei.msg", FT_UINT8, BASE_DEC, VALS(tei_msg_vals), 0x0,
 115                 "Message Type", HFILL }},
 116
 117         { &lm_action,
 118           { "Action", "tei.action", FT_UINT8, BASE_DEC, NULL, 0xfe,
 119                 "Action Indicator", HFILL }},
 120
 121         { &lm_extend,
 122           { "Extend", "tei.extend", FT_UINT8, BASE_DEC, NULL, 0x01,
 123                 "Extension Indicator", HFILL }}
 124     };
 125
 126     proto_tei = proto_register_protocol("TEI Management Procedure, Channel D (LAPD)",
 127                                          "TEI_MANAGEMENT", "tei_management");
 128     proto_register_field_array (proto_tei, hf, array_length(hf));
 129     proto_register_subtree_array(subtree, array_length(subtree));
 130 }
 131
 132 void
 133 proto_reg_handoff_teimanagement(void)
 134 {
 135     dissector_handle_t teimanagement_handle;
 136
 137     teimanagement_handle = create_dissector_handle(dissect_teimanagement,
 138         proto_tei);
 139     dissector_add_uint("lapd.sapi", LAPD_SAPI_L2, teimanagement_handle);
 140 }
 141
 142 /*
 143  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 144  *
 145  * Local variables:
 146  * c-basic-offset: 4
 147  * tab-width: 8
 148  * indent-tabs-mode: nil
 149  * End:
 150  *
 151  * vi: set shiftwidth=4 tabstop=8 expandtab:
 152  * :indentSize=4:tabSize=8:noTabs=true:
 153  */