forked from osmocom/wireshark
163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/* packet-eap.c
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* Routines for EAP Extensible Authentication Protocol header disassembly
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*
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* $Id: packet-eap.c,v 1.3 2001/12/03 03:59:34 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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#include "ppptypes.h"
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static int proto_eap = -1;
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static int hf_eap_code = -1;
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static int hf_eap_identifier = -1;
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static int hf_eap_len = -1;
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static int hf_eap_type = -1;
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static gint ett_eap = -1;
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static dissector_handle_t data_handle;
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typedef struct _e_eap {
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guint8 eap_code;
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guint8 eap_id;
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guint16 eap_len;
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} e_eap;
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static const char *eap_code_name[] = {
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"Undefined",
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"Request",
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"Response",
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"Success",
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"Failure",
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};
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#define EAP_CODE_COUNT (sizeof(eap_code_name)/sizeof(eap_code_name[0]))
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static const char *eap_type_name[] = {
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"Undefined",
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"Identity",
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"Nak (Response only)",
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"MD5-Challenge",
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"One-Time Password",
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"Generic Token Card",
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};
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#define EAP_TYPE_COUNT (sizeof(eap_type_name)/sizeof(eap_type_name[0]))
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void
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dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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e_eap eaph;
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guint len;
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proto_tree *ti;
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proto_tree *volatile eap_tree;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "EAP");
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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 *)&eaph, 0, sizeof(eaph));
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eaph.eap_len = ntohs(eaph.eap_len);
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len = eaph.eap_len;
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set_actual_length(tvb, pinfo, len);
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eap_tree = NULL;
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if (tree) {
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ti = proto_tree_add_item(tree, proto_eap, tvb, 0, len, FALSE);
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eap_tree = proto_item_add_subtree(ti, ett_eap);
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proto_tree_add_text(eap_tree, tvb, 0, 0, "Code: %s (%u) ",
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eaph.eap_code > EAP_CODE_COUNT?
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"Unknown": eap_code_name[eaph.eap_code],
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eaph.eap_code);
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proto_tree_add_uint(eap_tree, hf_eap_identifier, tvb, 1, 1, eaph.eap_id);
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proto_tree_add_uint(eap_tree, hf_eap_len, tvb, 2, 2, eaph.eap_len);
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if (len > 4) {
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guint8 eap_type = tvb_get_guint8(tvb, 4);
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proto_tree_add_text(eap_tree, tvb, 4, 1, "Type: %s (%u)",
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eap_type > EAP_TYPE_COUNT?
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"Unknown" : eap_type_name[eap_type],
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eap_type);
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}
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if (len > 5)
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call_dissector(data_handle,tvb_new_subset(tvb, 5,-1,tvb_reported_length_remaining(tvb,5)), pinfo, tree);
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}
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}
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void
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proto_register_eap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_eap_code, {
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"Code", "eap.code", FT_UINT8, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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{ &hf_eap_identifier, {
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"Id", "eap.id", FT_UINT8, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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{ &hf_eap_len, {
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"Length", "eap.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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{ &hf_eap_type, {
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"Type", "eap.type", FT_UINT8, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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};
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static gint *ett[] = {
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&ett_eap,
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};
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proto_eap = proto_register_protocol("Extensible Authentication Protocol",
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"EAP", "eap");
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proto_register_field_array(proto_eap, 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_eap(void)
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{
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dissector_handle_t eap_handle;
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data_handle = find_dissector("data");
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eap_handle = create_dissector_handle(dissect_eap, proto_eap);
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dissector_add("ppp.protocol", PPP_EAP, eap_handle);
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}
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