forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
directory to the epan directory. Some of them should perhaps ultimately be moved to epan/dissectors, if they pertain only to stuff exported by a particular dissector. Fix Gerald's e-mail address in files we're moving. svn path=/trunk/; revision=15844
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
/* packet-ieee802a.c
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* Routines for IEEE 802a
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/oui.h>
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#include <epan/etypes.h>
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#include "packet-ieee802a.h"
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static int proto_ieee802a = -1;
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static int hf_ieee802a_oui = -1;
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static int hf_ieee802a_pid = -1;
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static gint ett_ieee802a = -1;
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static dissector_handle_t data_handle;
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/*
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* Hash table for translating OUIs to a dissector table/field info pair;
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* the dissector table maps PID values to dissectors, and the field
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* corresponds to the PID for that OUI.
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*/
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typedef struct {
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dissector_table_t table;
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hf_register_info *field_info;
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} oui_info_t;
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static GHashTable *oui_info_table = NULL;
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/*
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* Add an entry for a new OUI.
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*/
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void
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ieee802a_add_oui(guint32 oui, const char *table_name, char *table_ui_name,
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hf_register_info *hf_item)
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{
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oui_info_t *new_info;
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new_info = g_malloc(sizeof (oui_info_t));
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new_info->table = register_dissector_table(table_name,
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table_ui_name, FT_UINT16, BASE_HEX);
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new_info->field_info = hf_item;
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/*
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* Create the hash table for OUI information, if it doesn't
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* already exist.
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*/
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if (oui_info_table == NULL) {
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oui_info_table = g_hash_table_new(g_direct_hash,
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g_direct_equal);
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}
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g_hash_table_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info);
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}
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static void
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dissect_ieee802a(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *ieee802a_tree = NULL;
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proto_item *ti;
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int offset = 0;
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tvbuff_t *next_tvb;
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guint32 oui;
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guint16 etype;
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oui_info_t *oui_info;
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dissector_table_t subdissector_table;
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int hf;
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "IEEE802a");
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ieee802a, tvb, 0, -1, FALSE);
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ieee802a_tree = proto_item_add_subtree(ti, ett_ieee802a);
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} else
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ieee802a_tree = NULL;
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oui = tvb_get_ntoh24(tvb, offset);
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etype = tvb_get_ntohs(tvb, offset+3);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"OUI 0x%06X (%s), PID 0x%04X",
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oui, val_to_str(oui, oui_vals, "Unknown"), etype);
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}
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if (tree) {
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proto_tree_add_uint(ieee802a_tree, hf_ieee802a_oui,
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tvb, offset, 3, oui);
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}
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/*
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* Do we have information for this OUI?
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*/
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if (oui_info_table != NULL &&
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(oui_info = g_hash_table_lookup(oui_info_table,
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GUINT_TO_POINTER(oui))) != NULL) {
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/*
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* Yes - use it.
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*/
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hf = *oui_info->field_info->p_id;
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subdissector_table = oui_info->table;
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} else {
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/*
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* No, use hf_ieee802a_pid for the PID and just dissect
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* the payload as data.
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*/
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hf = hf_ieee802a_pid;
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subdissector_table = NULL;
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}
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if (tree)
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proto_tree_add_uint(ieee802a_tree, hf, tvb, offset+3, 2, etype);
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next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
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if (subdissector_table != NULL) {
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/* do lookup with the subdissector table */
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if (dissector_try_port(subdissector_table, etype, next_tvb,
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pinfo, tree))
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return;
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}
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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void
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proto_register_ieee802a(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ieee802a_oui,
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{ "Organization Code", "ieee802a.oui", FT_UINT24, BASE_HEX,
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VALS(oui_vals), 0x0, "", HFILL }},
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{ &hf_ieee802a_pid,
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{ "Protocol ID", "ieee802a.pid", FT_UINT16, BASE_HEX,
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NULL, 0x0, "", HFILL }}
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};
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static gint *ett[] = {
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&ett_ieee802a,
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};
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proto_ieee802a = proto_register_protocol("IEEE802a OUI Extended Ethertype", "IEEE802a", "ieee802a");
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proto_register_field_array(proto_ieee802a, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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static void
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register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
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{
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oui_info_t *info = value;
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proto_register_field_array(proto_ieee802a, info->field_info, 1);
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}
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void
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proto_reg_handoff_ieee802a(void)
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{
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dissector_handle_t ieee802a_handle;
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data_handle = find_dissector("data");
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ieee802a_handle = create_dissector_handle(dissect_ieee802a,
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proto_ieee802a);
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dissector_add("ethertype", ETHERTYPE_IEEE802_OUI_EXTENDED,
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ieee802a_handle);
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/*
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* Register all the fields for PIDs for various OUIs.
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*/
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if (oui_info_table != NULL)
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g_hash_table_foreach(oui_info_table, register_hf, NULL);
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}
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