140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
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/* packet-eapol.c
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* Routines for EAPOL 802.1X authentication header disassembly
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*
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* $Id: packet-eapol.c,v 1.1 2001/11/06 20:30:39 guy Exp $
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <glib.h>
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#include "packet.h"
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#include "packet-ieee8023.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include "etypes.h"
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static int proto_eapol = -1;
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static int hf_eapol_version = -1;
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static int hf_eapol_type = -1;
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static int hf_eapol_len = -1;
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static gint ett_eapol = -1;
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typedef struct _e_eapol
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{
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guint8 eapol_ver;
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guint8 eapol_type;
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guint16 eapol_len;
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} e_eapol;
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static const char *eapol_type_name[] = {
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"EAP",
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"Start",
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"Logoff",
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"Key",
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"Encapsulated ASF Alert"
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};
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#define EAPOL_TYPE_COUNT (sizeof(eapol_type_name)/sizeof(eapol_type_name[0]))
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extern void dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static void
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dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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e_eapol eapolh;
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guint len;
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proto_tree *ti;
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proto_tree *volatile eapol_tree;
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tvbuff_t *next_tvb;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "EAPOL");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&eapolh, 0, sizeof(eapolh));
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eapolh.eapol_len = ntohs(eapolh.eapol_len);
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len = sizeof(eapolh) + eapolh.eapol_len;
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set_actual_length(tvb, pinfo, len);
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eapol_tree = NULL;
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if (tree) {
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ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, len, FALSE);
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eapol_tree = proto_item_add_subtree(ti, ett_eapol);
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proto_tree_add_uint(eapol_tree, hf_eapol_version, tvb, 0, 1, eapolh.eapol_ver);
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proto_tree_add_text(eapol_tree, tvb, 1, 1, "Type: %s (%u)",
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eapolh.eapol_type > EAPOL_TYPE_COUNT?
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"Unknown" : eapol_type_name[eapolh.eapol_type],
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eapolh.eapol_type);
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proto_tree_add_uint(eapol_tree, hf_eapol_len, tvb, 2, 2, eapolh.eapol_len);
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}
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next_tvb = tvb_new_subset(tvb, 4, -1, -1);
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if (eapolh.eapol_type == 0 && next_tvb != NULL)
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dissect_eap(next_tvb, pinfo, eapol_tree);
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else
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dissect_data(tvb, 4, pinfo, tree);
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}
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void
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proto_register_eapol(void)
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{
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static hf_register_info hf[] = {
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{ &hf_eapol_version, {
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"Version", "eapol.version", FT_UINT8, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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{ &hf_eapol_type, {
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"Type", "eapol.type", FT_UINT8, BASE_DEC,
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0, 0x0, "", HFILL }},
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{ &hf_eapol_len, {
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"Length", "eapol.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, "Length", HFILL }},
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};
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static gint *ett[] = {
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&ett_eapol,
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};
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proto_eapol = proto_register_protocol("802.1x Authentication", "EAPOL", "eapol");
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proto_register_field_array(proto_eapol, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_eapol(void)
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{
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dissector_add("ethertype", ETHERTYPE_EAPOL, dissect_eapol, proto_eapol);
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}
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