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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  24  */
  25
  26 #define NEW_PROTO_TREE_API
  27
  28 #include "config.h"
  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_handle_t hpext_handle;
  38
  39 static dissector_table_t subdissector_table;
  40
  41 static const value_string xsap_vals[] = {
  42         { HPEXT_DXSAP,  "RBOOT Destination Service Access Point" },
  43         { HPEXT_SXSAP,  "RBOOT Source Service Access Point" },
  44         { HPEXT_HPSW,   "HP Switch Protocol" },
  45         { HPEXT_SNMP,   "SNMP" },
  46         { 0x00,         NULL }
  47 };
  48
  49
  50 static header_field_info *hfi_hpext = NULL;
  51
  52 #define HPEXT_HFI_INIT HFI_INIT(proto_hpext)
  53
  54 static header_field_info hfi_hpext_dxsap HPEXT_HFI_INIT =
  55                 { "DXSAP",      "hpext.dxsap", FT_UINT16, BASE_HEX,
  56                         VALS(xsap_vals), 0x0, NULL, HFILL };
  57
  58 static header_field_info hfi_hpext_sxsap HPEXT_HFI_INIT =
  59                 { "SXSAP", "hpext.sxsap", FT_UINT16, BASE_HEX,
  60                         VALS(xsap_vals), 0x0, NULL, HFILL };
  61
  62
  63 static gint ett_hpext = -1;
  64
  65 static dissector_handle_t data_handle;
  66
  67 static void
  68 dissect_hpext(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  69 {
  70         proto_tree      *hpext_tree = NULL;
  71         proto_item      *ti = NULL;
  72         guint16         dxsap, sxsap;
  73         tvbuff_t        *next_tvb;
  74
  75         col_set_str(pinfo->cinfo, COL_PROTOCOL, "HPEXT");
  76
  77         dxsap = tvb_get_ntohs(tvb, 3);
  78         sxsap = tvb_get_ntohs(tvb, 5);
  79
  80         if (tree) {
  81                 ti = proto_tree_add_item(tree, hfi_hpext, tvb, 0, 7, ENC_NA);
  82                 hpext_tree = proto_item_add_subtree(ti, ett_hpext);
  83                 proto_tree_add_text(hpext_tree, tvb, 0, 3, "Reserved");
  84                 proto_tree_add_uint(hpext_tree, &hfi_hpext_dxsap, tvb, 3,
  85                         2, dxsap);
  86                 proto_tree_add_uint(hpext_tree, &hfi_hpext_sxsap, tvb, 5,
  87                         2, sxsap);
  88         }
  89
  90         col_append_fstr(pinfo->cinfo, COL_INFO,
  91                     "; HPEXT; DXSAP %s, SXSAP %s",
  92                     val_to_str(dxsap, xsap_vals, "%04x"),
  93                     val_to_str(sxsap, xsap_vals, "%04x"));
  94
  95         if (tvb_length_remaining(tvb, 7) > 0) {
  96                 next_tvb = tvb_new_subset_remaining(tvb, 7);
  97                 if (!dissector_try_uint(subdissector_table,
  98                     dxsap, next_tvb, pinfo, tree)) {
  99                         call_dissector(data_handle, next_tvb, pinfo, tree);
 100                 }
 101         }
 102 }
 103
 104 void
 105 proto_register_hpext(void)
 106 {
 107 #ifndef HAVE_HFI_SECTION_INIT
 108         static header_field_info *hfi[] = {
 109                 &hfi_hpext_dxsap,
 110                 &hfi_hpext_sxsap,
 111         };
 112 #endif
 113
 114         static gint *ett[] = {
 115                 &ett_hpext
 116         };
 117
 118         int proto_hpext;
 119
 120         proto_hpext = proto_register_protocol(
 121             "HP Extended Local-Link Control", "HPEXT", "hpext");
 122         hfi_hpext = proto_registrar_get_nth(proto_hpext);
 123
 124         proto_register_fields(proto_hpext, hfi, array_length(hfi));
 125         proto_register_subtree_array(ett, array_length(ett));
 126
 127 /* subdissector code */
 128         subdissector_table = register_dissector_table("hpext.dxsap",
 129           "HPEXT XSAP", FT_UINT16, BASE_HEX);
 130
 131         hpext_handle = register_dissector("hpext", dissect_hpext, proto_hpext);
 132 }
 133
 134 void
 135 proto_reg_handoff_hpext(void)
 136 {
 137         data_handle = find_dissector("data");
 138
 139         dissector_add_uint("llc.dsap", SAP_HPEXT, hpext_handle);
 140 }