epan/dissectors/packet-bctp.c

   1 /*
   2  *  packet-bctp.c
   3  *  Q.1990 BICC bearer control tunnelling protocol
   4  *
   5  *  (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  *
  27  * Ref ITU-T Rec. Q.1990 (07/2001)
  28  */
  29
  30 #include "config.h"
  31
  32 #include <glib.h>
  33 #include <epan/packet.h>
  34
  35 #define PNAME  "BCTP Q.1990"
  36 #define PSNAME "BCTP"
  37 #define PFNAME "bctp"
  38
  39 void proto_register_bctp(void);
  40 void proto_reg_handoff_bctp(void);
  41
  42 static int proto_bctp = -1;
  43 static int hf_bctp_bvei = -1;
  44 static int hf_bctp_bvi = -1;
  45 static int hf_bctp_tpei = -1;
  46 static int hf_bctp_tpi = -1;
  47
  48 static gint ett_bctp = -1;
  49 static dissector_table_t bctp_dissector_table;
  50 static dissector_handle_t data_handle;
  51 static dissector_handle_t text_handle;
  52
  53 /*
  54 static const range_string tpi_vals[] = {
  55         {0x00,0x17,"spare (binary encoded protocols)"},
  56         {0x18,0x1f,"reserved for national use (binary encoded protocols)"},
  57         {0x20,0x20,"IPBCP (text encoded)"},
  58         {0x21,0x21,"spare (text encoded protocol)"},
  59         {0x22,0x22,"not used"},
  60         {0x23,0x37,"spare (text encoded protocols)"},
  61         {0x38,0x3f,"reserved for national use (text encoded protocols)"},
  62         {0,0,NULL}
  63 };
  64 */
  65
  66 static const value_string bvei_vals[] = {
  67         {0,"No indication"},
  68         {0,"Version Error Indication, BCTP version not supported"},
  69         {0,NULL}
  70 };
  71
  72
  73 static void dissect_bctp(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) {
  74         proto_item* pi = proto_tree_add_item(tree, proto_bctp, tvb,0,2, ENC_NA);
  75         proto_tree* pt = proto_item_add_subtree(pi,ett_bctp);
  76         tvbuff_t* sub_tvb = tvb_new_subset_remaining(tvb, 2);
  77         guint8 tpi = tvb_get_guint8(tvb,1) & 0x3f;
  78
  79         proto_tree_add_item(pt, hf_bctp_bvei, tvb,0,2, ENC_BIG_ENDIAN);
  80         proto_tree_add_item(pt, hf_bctp_bvi, tvb,0,2, ENC_BIG_ENDIAN);
  81         proto_tree_add_item(pt, hf_bctp_tpei, tvb,0,2, ENC_BIG_ENDIAN);
  82         proto_tree_add_item(pt, hf_bctp_tpi, tvb,0,2, ENC_BIG_ENDIAN);
  83
  84         if ( dissector_try_uint(bctp_dissector_table, tpi, sub_tvb, pinfo, tree) ) {
  85                 return;
  86         } else if (tpi <= 0x22) {
  87                 call_dissector(data_handle,sub_tvb, pinfo, tree);
  88         } else {
  89                 /* tpi > 0x22 */
  90                 call_dissector(text_handle,sub_tvb, pinfo, tree);
  91         }
  92 }
  93
  94 void
  95 proto_register_bctp (void)
  96 {
  97         static hf_register_info hf[] = {
  98                 {&hf_bctp_bvei, {"BVEI", "bctp.bvei", FT_UINT16, BASE_HEX, VALS(bvei_vals), 0x4000, "BCTP Version Error Indicator", HFILL }},
  99                 {&hf_bctp_bvi, {"BVI", "bctp.bvi", FT_UINT16, BASE_HEX, NULL, 0x1F00, "BCTP Version Indicator", HFILL }},
 100                 {&hf_bctp_tpei, {"TPEI", "bctp.tpei", FT_UINT16, BASE_HEX, NULL, 0x0040, "Tunneled Protocol Error Indicator", HFILL }},
 101                 {&hf_bctp_tpi, {"TPI", "bctp.tpi", FT_UINT16, BASE_HEX, NULL, 0x003F, "Tunneled Protocol Indicator", HFILL }},
 102         };
 103         static gint *ett[] = {
 104                 &ett_bctp
 105         };
 106
 107         proto_bctp = proto_register_protocol(PNAME, PSNAME, PFNAME);
 108         proto_register_field_array(proto_bctp, hf, array_length(hf));
 109         proto_register_subtree_array(ett, array_length(ett));
 110
 111         register_dissector("bctp", dissect_bctp, proto_bctp);
 112
 113         bctp_dissector_table = register_dissector_table("bctp.tpi", "BCTP Tunneled Protocol Indicator", FT_UINT32, BASE_DEC);
 114 }
 115
 116 void
 117 proto_reg_handoff_bctp(void)
 118 {
 119         data_handle = find_dissector("data");
 120         text_handle = find_dissector("data-text-lines");
 121 }
 122