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/* packet-eapol.c
* Routines for EAPOL 802.1X authentication header disassembly
*
* $Id: packet-eapol.c,v 1.4 2001/12/10 00:25:27 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#include "packet.h"
#include "packet-ieee8023.h"
#include "packet-ipx.h"
#include "packet-llc.h"
#include "etypes.h"
static int proto_eapol = -1;
static int hf_eapol_version = -1;
static int hf_eapol_type = -1;
static int hf_eapol_len = -1;
static gint ett_eapol = -1;
static dissector_handle_t data_handle;
typedef struct _e_eapol
{
guint8 eapol_ver;
guint8 eapol_type;
guint16 eapol_len;
} e_eapol;
static const char *eapol_type_name[] = {
"EAP",
"Start",
"Logoff",
"Key",
"Encapsulated ASF Alert"
};
#define EAPOL_TYPE_COUNT (sizeof(eapol_type_name)/sizeof(eapol_type_name[0]))
extern void dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void
dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
e_eapol eapolh;
guint len;
proto_tree *ti;
proto_tree *volatile eapol_tree;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAPOL");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
tvb_memcpy(tvb, (guint8 *)&eapolh, 0, sizeof(eapolh));
eapolh.eapol_len = ntohs(eapolh.eapol_len);
len = sizeof(eapolh) + eapolh.eapol_len;
set_actual_length(tvb, pinfo, len);
eapol_tree = NULL;
if (tree) {
ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, len, FALSE);
eapol_tree = proto_item_add_subtree(ti, ett_eapol);
proto_tree_add_uint(eapol_tree, hf_eapol_version, tvb, 0, 1, eapolh.eapol_ver);
proto_tree_add_text(eapol_tree, tvb, 1, 1, "Type: %s (%u)",
eapolh.eapol_type > EAPOL_TYPE_COUNT?
"Unknown" : eapol_type_name[eapolh.eapol_type],
eapolh.eapol_type);
proto_tree_add_uint(eapol_tree, hf_eapol_len, tvb, 2, 2, eapolh.eapol_len);
}
next_tvb = tvb_new_subset(tvb, 4, -1, -1);
if (eapolh.eapol_type == 0 && next_tvb != NULL)
dissect_eap(next_tvb, pinfo, eapol_tree);
else
call_dissector(data_handle,tvb_new_subset(tvb, 4,-1,tvb_reported_length_remaining(tvb,4)), pinfo, tree);
}
void
proto_register_eapol(void)
{
static hf_register_info hf[] = {
{ &hf_eapol_version, {
"Version", "eapol.version", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL }},
{ &hf_eapol_type, {
"Type", "eapol.type", FT_UINT8, BASE_DEC,
0, 0x0, "", HFILL }},
{ &hf_eapol_len, {
"Length", "eapol.len", FT_UINT16, BASE_DEC,
NULL, 0x0, "Length", HFILL }},
};
static gint *ett[] = {
&ett_eapol,
};
proto_eapol = proto_register_protocol("802.1x Authentication", "EAPOL", "eapol");
proto_register_field_array(proto_eapol, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_eapol(void)
{
dissector_handle_t eapol_handle;
data_handle = find_dissector("data");
eapol_handle = create_dissector_handle(dissect_eapol, proto_eapol);
dissector_add("ethertype", ETHERTYPE_EAPOL, eapol_handle);
}
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