forked from osmocom/wireshark
![Evan Huus](/assets/img/avatar_default.png)
obvious that the returned string is ephemeral, and opens up the original names in the API for versions that take a wmem pool (and thus can work in any scope). svn path=/trunk/; revision=54249
196 lines
5.2 KiB
C
196 lines
5.2 KiB
C
/* packet-ieee802a.c
|
|
* Routines for IEEE 802a
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/addr_resolv.h>
|
|
#include <epan/strutil.h>
|
|
#include <epan/etypes.h>
|
|
|
|
#include "packet-ieee802a.h"
|
|
|
|
void proto_register_ieee802a(void);
|
|
void proto_reg_handoff_ieee802a(void);
|
|
|
|
static int proto_ieee802a = -1;
|
|
static int hf_ieee802a_oui = -1;
|
|
static int hf_ieee802a_pid = -1;
|
|
|
|
static gint ett_ieee802a = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
/*
|
|
* Hash table for translating OUIs to a dissector table/field info pair;
|
|
* the dissector table maps PID values to dissectors, and the field
|
|
* corresponds to the PID for that OUI.
|
|
*/
|
|
typedef struct {
|
|
dissector_table_t table;
|
|
hf_register_info *field_info;
|
|
} oui_info_t;
|
|
|
|
static GHashTable *oui_info_table = NULL;
|
|
|
|
/*
|
|
* Add an entry for a new OUI.
|
|
*/
|
|
void
|
|
ieee802a_add_oui(guint32 oui, const char *table_name, const char *table_ui_name,
|
|
hf_register_info *hf_item)
|
|
{
|
|
oui_info_t *new_info;
|
|
|
|
new_info = (oui_info_t *)g_malloc(sizeof (oui_info_t));
|
|
new_info->table = register_dissector_table(table_name,
|
|
table_ui_name, FT_UINT16, BASE_HEX);
|
|
new_info->field_info = hf_item;
|
|
|
|
/*
|
|
* Create the hash table for OUI information, if it doesn't
|
|
* already exist.
|
|
*/
|
|
if (oui_info_table == NULL) {
|
|
oui_info_table = g_hash_table_new(g_direct_hash,
|
|
g_direct_equal);
|
|
}
|
|
g_hash_table_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info);
|
|
}
|
|
|
|
static void
|
|
dissect_ieee802a(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *ieee802a_tree = NULL;
|
|
proto_item *ti;
|
|
tvbuff_t *next_tvb;
|
|
const gchar *manuf;
|
|
guint8 oui[3];
|
|
guint32 oui32;
|
|
guint16 pid;
|
|
oui_info_t *oui_info;
|
|
dissector_table_t subdissector_table;
|
|
int hf;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IEEE802a");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_ieee802a, tvb, 0, 5, ENC_NA);
|
|
ieee802a_tree = proto_item_add_subtree(ti, ett_ieee802a);
|
|
}
|
|
|
|
tvb_memcpy(tvb, oui, 0, 3);
|
|
oui32 = oui[0] << 16 | oui[1] << 8 | oui[2];
|
|
manuf = get_manuf_name_if_known(oui);
|
|
pid = tvb_get_ntohs(tvb, 3);
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "OUI %s (%s), PID 0x%04X",
|
|
bytes_to_ep_str_punct(oui, 3, ':'),
|
|
manuf ? manuf : "Unknown", pid);
|
|
|
|
proto_tree_add_uint_format_value(ieee802a_tree, hf_ieee802a_oui,
|
|
tvb, 0, 3, oui32, "%s (%s)",
|
|
bytes_to_ep_str_punct(oui, 3, ':'), manuf ? manuf : "Unknown");
|
|
|
|
/*
|
|
* Do we have information for this OUI?
|
|
*/
|
|
if (oui_info_table != NULL &&
|
|
(oui_info = (oui_info_t *)g_hash_table_lookup(oui_info_table,
|
|
GUINT_TO_POINTER(oui32))) != NULL) {
|
|
/*
|
|
* Yes - use it.
|
|
*/
|
|
hf = *oui_info->field_info->p_id;
|
|
subdissector_table = oui_info->table;
|
|
} else {
|
|
/*
|
|
* No, use hf_ieee802a_pid for the PID and just dissect
|
|
* the payload as data.
|
|
*/
|
|
hf = hf_ieee802a_pid;
|
|
subdissector_table = NULL;
|
|
}
|
|
if (tree)
|
|
proto_tree_add_uint(ieee802a_tree, hf, tvb, 3, 2, pid);
|
|
next_tvb = tvb_new_subset_remaining(tvb, 5);
|
|
if (subdissector_table != NULL) {
|
|
/* do lookup with the subdissector table */
|
|
if (dissector_try_uint(subdissector_table, pid, next_tvb,
|
|
pinfo, tree))
|
|
return;
|
|
}
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
}
|
|
|
|
void
|
|
proto_register_ieee802a(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_ieee802a_oui,
|
|
{ "Organization Code", "ieee802a.oui", FT_UINT24, BASE_HEX,
|
|
NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_ieee802a_pid,
|
|
{ "Protocol ID", "ieee802a.pid", FT_UINT16, BASE_HEX,
|
|
NULL, 0x0, NULL, HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ieee802a,
|
|
};
|
|
|
|
proto_ieee802a = proto_register_protocol("IEEE802a OUI Extended Ethertype", "IEEE802a", "ieee802a");
|
|
proto_register_field_array(proto_ieee802a, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
static void
|
|
register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
|
|
{
|
|
oui_info_t *info = (oui_info_t *)value;
|
|
|
|
proto_register_field_array(proto_ieee802a, info->field_info, 1);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ieee802a(void)
|
|
{
|
|
dissector_handle_t ieee802a_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
ieee802a_handle = create_dissector_handle(dissect_ieee802a,
|
|
proto_ieee802a);
|
|
dissector_add_uint("ethertype", ETHERTYPE_IEEE802_OUI_EXTENDED,
|
|
ieee802a_handle);
|
|
|
|
/*
|
|
* Register all the fields for PIDs for various OUIs.
|
|
*/
|
|
if (oui_info_table != NULL)
|
|
g_hash_table_foreach(oui_info_table, register_hf, NULL);
|
|
}
|