epan/dissectors/packet-hpext.c

   1 /* packet-hpext.c
   2  * Routines for HP extended IEEE 802.2 LLC layer
   3  * Jochen Friedrich <jochen@scram.de>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include <epan/xdlc.h>
  33 #include <epan/etypes.h>
  34 #include <epan/llcsaps.h>
  35 #include "packet-hpext.h"
  36
  37 static dissector_table_t subdissector_table;
  38
  39 static dissector_handle_t data_handle;
  40
  41 static int proto_hpext = -1;
  42
  43 static int hf_hpext_dxsap = -1;
  44 static int hf_hpext_sxsap = -1;
  45
  46 static gint ett_hpext = -1;
  47
  48 const value_string xsap_vals[] = {
  49         { HPEXT_DXSAP,  "RBOOT Destination Service Access Point" },
  50         { HPEXT_SXSAP,  "RBOOT Source Service Access Point" },
  51         { HPEXT_SNMP,   "SNMP" },
  52         { 0x00,         NULL }
  53 };
  54
  55 static void
  56 dissect_hpext(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  57 {
  58         proto_tree      *hpext_tree = NULL;
  59         proto_item      *ti = NULL;
  60         guint16         dxsap, sxsap;
  61         tvbuff_t        *next_tvb;
  62
  63         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
  64                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "HPEXT");
  65         }
  66
  67         dxsap = tvb_get_ntohs(tvb, 3);
  68         sxsap = tvb_get_ntohs(tvb, 5);
  69
  70         if (tree) {
  71                 ti = proto_tree_add_item(tree, proto_hpext, tvb, 0, 7, FALSE);
  72                 hpext_tree = proto_item_add_subtree(ti, ett_hpext);
  73                 proto_tree_add_text(hpext_tree, tvb, 0, 3, "Reserved");
  74                 proto_tree_add_uint(hpext_tree, hf_hpext_dxsap, tvb, 3,
  75                         2, dxsap);
  76                 proto_tree_add_uint(hpext_tree, hf_hpext_sxsap, tvb, 5,
  77                         2, sxsap);
  78         }
  79
  80         if (check_col(pinfo->cinfo, COL_INFO))
  81                 col_append_fstr(pinfo->cinfo, COL_INFO,
  82                     "; HPEXT; DXSAP %s, SXSAP %s",
  83                     val_to_str(dxsap, xsap_vals, "%04x"),
  84                     val_to_str(sxsap, xsap_vals, "%04x"));
  85
  86         if (tvb_length_remaining(tvb, 7) > 0) {
  87                 next_tvb = tvb_new_subset(tvb, 7, -1, -1);
  88                 if (!dissector_try_port(subdissector_table,
  89                     dxsap, next_tvb, pinfo, tree)) {
  90                         call_dissector(data_handle, next_tvb, pinfo, tree);
  91                 }
  92         }
  93 }
  94
  95 void
  96 proto_register_hpext(void)
  97 {
  98         static hf_register_info hf[] = {
  99                 { &hf_hpext_dxsap,
 100                 { "DXSAP",      "hpext.dxsap", FT_UINT16, BASE_HEX,
 101                         VALS(xsap_vals), 0x0, "", HFILL }},
 102
 103                 { &hf_hpext_sxsap,
 104                 { "SXSAP", "hpext.sxsap", FT_UINT16, BASE_HEX,
 105                         VALS(xsap_vals), 0x0, "", HFILL }},
 106         };
 107         static gint *ett[] = {
 108                 &ett_hpext,
 109         };
 110
 111         proto_hpext = proto_register_protocol(
 112             "HP Extended Local-Link Control", "HPEXT", "hpext");
 113         proto_register_field_array(proto_hpext, hf, array_length(hf));
 114         proto_register_subtree_array(ett, array_length(ett));
 115
 116 /* subdissector code */
 117         subdissector_table = register_dissector_table("hpext.dxsap",
 118           "HPEXT XSAP", FT_UINT16, BASE_HEX);
 119
 120         register_dissector("hpext", dissect_hpext, proto_hpext);
 121 }
 122
 123 void
 124 proto_reg_handoff_hpext(void)
 125 {
 126         dissector_handle_t hpext_handle;
 127
 128         data_handle = find_dissector("data");
 129
 130         hpext_handle = find_dissector("hpext");
 131         dissector_add("llc.dsap", SAP_HPEXT, hpext_handle);
 132 }