forked from osmocom/wireshark
![Stephen Fisher](/assets/img/avatar_default.png)
them, add -Wno-pointer-sign to CFLAGS when gcc will accept it. svn path=/trunk/; revision=21253
331 lines
10 KiB
C
331 lines
10 KiB
C
/* packet-igap.c
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* Routines for IGMP/IGAP packet disassembly
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* 2003, Endoh Akria (see AUTHORS for email)
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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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/*
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IGAP "Internet Group membership Authentication Protocol"
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is defined in draft-hayashi-igap-03.txt.
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(Author's memo)
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Type Subtype Message Msize
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-----------------------------------------------------
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---- 0x02 User password variable
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---- 0x03 ---- 00
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---- 0x04 Result of MD5 calculation 16
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0x41 0x23 Challenge value ??
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0x41 0x24 Authentication result code 1
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0x41 0x25 Accounting status code 1
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---- 0x42 User password variable
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---- 0x43 ---- 00
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---- 0x44 Result of MD5 calculation 16
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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/strutil.h>
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#include "packet-igmp.h"
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#include "packet-igap.h"
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static int proto_igap = -1;
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static int hf_type = -1;
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static int hf_max_resp = -1;
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static int hf_checksum = -1;
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static int hf_checksum_bad = -1;
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static int hf_maddr = -1;
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static int hf_version = -1;
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static int hf_subtype = -1;
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static int hf_challengeid = -1;
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static int hf_asize = -1;
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static int hf_msize = -1;
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static int hf_account = -1;
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static int ett_igap = -1;
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static const value_string igap_types[] = {
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{IGMP_IGAP_JOIN, "Membership Report (Join)"},
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{IGMP_IGAP_QUERY, "Membership Query"},
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{IGMP_IGAP_LEAVE, "Leave Group"},
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{0, NULL}
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};
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#define IGAP_VERSION_1 0x10
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static const value_string igap_version[] = {
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{IGAP_VERSION_1, "1"},
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{0, NULL}
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};
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#define IGAP_SUBTYPE_PASSWORD_JOIN 0x02
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#define IGAP_SUBTYPE_CHALLENGE_REQUEST_JOIN 0x03
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#define IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN 0x04
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#define IGAP_SUBTYPE_BASIC_QUERY 0x21
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#define IGAP_SUBTYPE_CHALLENGE 0x23
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#define IGAP_SUBTYPE_AUTH_MESSAGE 0x24
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#define IGAP_SUBTYPE_ACCOUNTING_MESSAGE 0x25
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#define IGAP_SUBTYPE_BASIC_LEAVE 0x41
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#define IGAP_SUBTYPE_PASSWORD_LEAVE 0x42
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#define IGAP_SUBTYPE_CHALLENGE_REQUEST_LEAVE 0x43
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#define IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE 0x44
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static const value_string igap_subtypes[] = {
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{IGAP_SUBTYPE_PASSWORD_JOIN, "Password Mechanism Join (Password-Join)"},
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{IGAP_SUBTYPE_CHALLENGE_REQUEST_JOIN, "Challenge-Response Mechanism Join Request (Challenge-Request-Join)"},
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{IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN, "Challenge-Response Mechanism Join Response (Challenge-Response-Join)"},
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{IGAP_SUBTYPE_BASIC_QUERY, "Basic Query"},
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{IGAP_SUBTYPE_CHALLENGE, "Challenge-Response Mechanism Challenge (Challenge)"},
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{IGAP_SUBTYPE_AUTH_MESSAGE, "Authentication Message"},
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{IGAP_SUBTYPE_ACCOUNTING_MESSAGE, "Accounting Message"},
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{IGAP_SUBTYPE_BASIC_LEAVE, "Basic Leave"},
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{IGAP_SUBTYPE_PASSWORD_LEAVE, "Password Mechanism Leave (Password-Leave)"},
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{IGAP_SUBTYPE_CHALLENGE_REQUEST_LEAVE, "Challenge-Response Mechanism Leave Challenge Request (Challenge-Request-Leave)"},
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{IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE, "Challenge-Response Mechanism Response (Challenge-Response-Leave)"},
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{0, NULL}
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};
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#define IGAP_AUTH_SUCCESS 0x11
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#define IGAP_AUTH_FAIL 0x21
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static const value_string igap_auth_result[] = {
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{IGAP_AUTH_SUCCESS, "Authentication success"},
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{IGAP_AUTH_FAIL, "Authentication failure"},
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{0, NULL}
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};
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#define IGAP_ACCOUNT_START 0x11
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#define IGAP_ACCOUNT_STOP 0x21
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static const value_string igap_account_status[] = {
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{IGAP_ACCOUNT_START, "Accounting start"},
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{IGAP_ACCOUNT_STOP, "Accounting stop"},
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{0, NULL}
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};
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#define ACCOUNT_SIZE 16
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#define MESSAGE_SIZE 64
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/* This function is only called from the IGMP dissector */
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int
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dissect_igap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 type, tsecs, subtype, asize, msize;
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guchar account[ACCOUNT_SIZE+1], message[MESSAGE_SIZE+1];
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if (!proto_is_protocol_enabled(find_protocol_by_id(proto_igap))) {
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/* we are not enabled, skip entire packet to be nice
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to the igmp layer. (so clicking on IGMP will display the data)
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*/
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return offset + tvb_length_remaining(tvb, offset);
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}
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item = proto_tree_add_item(parent_tree, proto_igap, tvb, offset, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_igap);
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGAP");
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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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type = tvb_get_guint8(tvb, offset);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
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val_to_str(type, igap_types, "Unknown Type: 0x%02x"));
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}
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proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
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offset += 1;
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tsecs = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format(tree, hf_max_resp, tvb, offset, 1, tsecs,
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"Max Response Time: %.1f sec (0x%02x)", tsecs * 0.1, tsecs);
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offset += 1;
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igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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offset += 2;
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proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
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offset += 4;
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proto_tree_add_uint(tree, hf_version, tvb, offset, 1,
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tvb_get_guint8(tvb, offset));
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offset += 1;
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subtype = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_subtype, tvb, offset, 1, subtype);
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offset += 2;
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proto_tree_add_uint(tree, hf_challengeid, tvb, offset, 1,
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tvb_get_guint8(tvb, offset));
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offset += 1;
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asize = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_asize, tvb, offset, 1, asize);
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offset += 1;
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msize = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_msize, tvb, offset, 1, msize);
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offset += 3;
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if (asize > 0) {
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if (asize > ACCOUNT_SIZE) {
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/* Bogus account size.
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XXX - flag this? */
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asize = ACCOUNT_SIZE;
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}
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tvb_memcpy(tvb, account, offset, asize);
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account[asize] = '\0';
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proto_tree_add_string(tree, hf_account, tvb, offset, asize, account);
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}
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offset += ACCOUNT_SIZE;
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if (msize > 0) {
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if (msize > MESSAGE_SIZE) {
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/* Bogus message size.
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XXX - flag this? */
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msize = MESSAGE_SIZE;
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}
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tvb_memcpy(tvb, message, offset, msize);
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switch (subtype) {
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case IGAP_SUBTYPE_PASSWORD_JOIN:
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case IGAP_SUBTYPE_PASSWORD_LEAVE:
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/* Challenge field is user's password */
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message[msize] = '\0';
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proto_tree_add_text(tree, tvb, offset, msize,
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"User password: %s", message);
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break;
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case IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN:
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case IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE:
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/* Challenge field is the results of MD5 calculation */
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proto_tree_add_text(tree, tvb, offset, msize,
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"Result of MD5 calculation: 0x%s",
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bytes_to_str(message, msize));
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break;
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case IGAP_SUBTYPE_CHALLENGE:
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/* Challenge field is the challenge value */
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proto_tree_add_text(tree, tvb, offset, msize,
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"Challenge: 0x%s",
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bytes_to_str(message, msize));
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break;
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case IGAP_SUBTYPE_AUTH_MESSAGE:
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/* Challenge field indicates the result of the authenticaion */
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proto_tree_add_text(tree, tvb, offset, msize,
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"Authentication result: %s (0x%x)",
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val_to_str(message[0], igap_auth_result,
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"Unknown"), message[0]);
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break;
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case IGAP_SUBTYPE_ACCOUNTING_MESSAGE:
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/* Challenge field indicates the accounting status */
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proto_tree_add_text(tree, tvb, offset, msize,
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"Accounting status: %s (0x%x)",
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val_to_str(message[0], igap_account_status,
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"Unknown"), message[0]);
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break;
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default:
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proto_tree_add_text(tree, tvb, offset, msize,
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"Message: (Unknown)");
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}
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}
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offset += MESSAGE_SIZE;
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if (item) proto_item_set_len(item, offset);
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return offset;
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}
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void
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proto_register_igap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "igap.type", FT_UINT8, BASE_HEX,
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VALS(igap_types), 0, "IGAP Packet Type", HFILL }
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},
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{ &hf_max_resp,
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{ "Max Resp Time", "igap.max_resp", FT_UINT8, BASE_DEC,
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NULL, 0, "Max Response Time", HFILL }
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},
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{ &hf_checksum,
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{ "Checksum", "igap.checksum", FT_UINT16, BASE_HEX,
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NULL, 0, "Checksum", HFILL }
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},
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{ &hf_checksum_bad,
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{ "Bad Checksum", "igap.checksum_bad", FT_BOOLEAN, BASE_NONE,
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NULL, 0, "Bad Checksum", HFILL }
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},
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{ &hf_maddr,
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{ "Multicast group address", "igap.maddr", FT_IPv4, BASE_NONE,
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NULL, 0, "Multicast group address", HFILL }
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},
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{ &hf_version,
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{ "Version", "igap.version", FT_UINT8, BASE_HEX,
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VALS(igap_version), 0, "IGAP protocol version", HFILL }
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},
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{ &hf_subtype,
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{ "Subtype", "igap.subtype", FT_UINT8, BASE_HEX,
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VALS(igap_subtypes), 0, "Subtype", HFILL }
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},
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{ &hf_challengeid,
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{ "Challenge ID", "igap.challengeid", FT_UINT8, BASE_HEX,
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NULL, 0, "Challenge ID", HFILL }
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},
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{ &hf_asize,
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{ "Account Size", "igap.asize", FT_UINT8, BASE_DEC,
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NULL, 0, "Length of the User Account field", HFILL }
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},
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{ &hf_msize,
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{ "Message Size", "igap.msize", FT_UINT8, BASE_DEC,
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NULL, 0, "Length of the Message field", HFILL }
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},
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{ &hf_account,
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{ "User Account", "igap.account", FT_STRING, BASE_NONE,
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NULL, 0, "User account", HFILL }
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}
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};
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static gint *ett[] = {
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&ett_igap
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};
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proto_igap = proto_register_protocol
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("Internet Group membership Authentication Protocol",
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"IGAP", "igap");
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proto_register_field_array(proto_igap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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