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wireshark/packet-igap.c

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/* packet-igap.c
* Routines for IGMP/IGAP packet disassembly
* 2003, Endoh Akria (see AUTHORS for email)
*
* $Id: packet-igap.c,v 1.2 2004/03/06 01:54:53 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.
*/
/*
IGAP "Internet Group membership Authentication Protocol"
is defined in draft-hayashi-igap-03.txt.
(Author's memo)
Type Subtype Message Msize
-----------------------------------------------------
---- 0x02 User password variable
---- 0x03 ---- 00
---- 0x04 Result of MD5 calculation 16
0x41 0x23 Challenge value ??
0x41 0x24 Authentication result code 1
0x41 0x25 Accounting status code 1
---- 0x42 User password variable
---- 0x43 ---- 00
---- 0x44 Result of MD5 calculation 16
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include "packet-igmp.h"
#include "packet-igap.h"
static int proto_igap = -1;
static int hf_type = -1;
static int hf_max_resp = -1;
static int hf_checksum = -1;
static int hf_checksum_bad = -1;
static int hf_maddr = -1;
static int hf_version = -1;
static int hf_subtype = -1;
static int hf_challengeid = -1;
static int hf_asize = -1;
static int hf_msize = -1;
static int hf_account = -1;
static int ett_igap = -1;
static const value_string igap_types[] = {
{IGMP_IGAP_JOIN, "Membership Report (Join)"},
{IGMP_IGAP_QUERY, "Membership Query"},
{IGMP_IGAP_LEAVE, "Leave Group"},
{0, NULL}
};
#define IGAP_VERSION_1 0x10
static const value_string igap_version[] = {
{IGAP_VERSION_1, "1"},
{0, NULL}
};
#define IGAP_SUBTYPE_PASSWORD_JOIN 0x02
#define IGAP_SUBTYPE_CHALLENGE_REQUEST_JOIN 0x03
#define IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN 0x04
#define IGAP_SUBTYPE_BASIC_QUERY 0x21
#define IGAP_SUBTYPE_CHALLENGE 0x23
#define IGAP_SUBTYPE_AUTH_MESSAGE 0x24
#define IGAP_SUBTYPE_ACCOUNTING_MESSAGE 0x25
#define IGAP_SUBTYPE_BASIC_LEAVE 0x41
#define IGAP_SUBTYPE_PASSWORD_LEAVE 0x42
#define IGAP_SUBTYPE_CHALLENGE_REQUEST_LEAVE 0x43
#define IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE 0x44
static const value_string igap_subtypes[] = {
{IGAP_SUBTYPE_PASSWORD_JOIN, "Password Mechanism Join (Password-Join)"},
{IGAP_SUBTYPE_CHALLENGE_REQUEST_JOIN, "Challenge-Response Mechanism Join Request (Challenge-Request-Join)"},
{IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN, "Challenge-Response Mechanism Join Response (Challenge-Response-Join)"},
{IGAP_SUBTYPE_BASIC_QUERY, "Basic Query"},
{IGAP_SUBTYPE_CHALLENGE, "Challenge-Response Mechanism Challenge (Challenge)"},
{IGAP_SUBTYPE_AUTH_MESSAGE, "Authentication Message"},
{IGAP_SUBTYPE_ACCOUNTING_MESSAGE, "Accounting Message"},
{IGAP_SUBTYPE_BASIC_LEAVE, "Basic Leave"},
{IGAP_SUBTYPE_PASSWORD_LEAVE, "Password Mechanism Leave (Password-Leave)"},
{IGAP_SUBTYPE_CHALLENGE_REQUEST_LEAVE, "Challenge-Response Mechanism Leave Challenge Request (Challenge-Request-Leave)"},
{IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE, "Challenge-Response Mechanism Response (Challenge-Response-Leave)"},
{0, NULL}
};
#define IGAP_AUTH_SUCCESS 0x11
#define IGAP_AUTH_FAIL 0x21
static const value_string igap_auth_result[] = {
{IGAP_AUTH_SUCCESS, "Authentication success"},
{IGAP_AUTH_FAIL, "Authentication failure"},
{0, NULL}
};
#define IGAP_ACCOUNT_START 0x11
#define IGAP_ACCOUNT_STOP 0x21
static const value_string igap_account_status[] = {
{IGAP_ACCOUNT_START, "Accounting start"},
{IGAP_ACCOUNT_STOP, "Accounting stop"},
{0, NULL}
};
#define ACCOUNT_SIZE 16
#define MESSAGE_SIZE 64
/* This function is only called from the IGMP dissector */
int
dissect_igap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
proto_tree *tree;
proto_item *item;
guint8 type, tsecs, subtype, asize, msize;
guchar account[ACCOUNT_SIZE+1], message[MESSAGE_SIZE+1];
if (!proto_is_protocol_enabled(find_protocol_by_id(proto_igap))) {
/* we are not enabled, skip entire packet to be nice
to the igmp layer. (so clicking on IGMP will display the data)
*/
return offset + tvb_length_remaining(tvb, offset);
}
item = proto_tree_add_item(parent_tree, proto_igap, tvb, offset, -1, FALSE);
tree = proto_item_add_subtree(item, ett_igap);
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGAP");
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
}
type = tvb_get_guint8(tvb, offset);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
val_to_str(type, igap_types, "Unknown Type: 0x%02x"));
}
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
offset += 1;
tsecs = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(tree, hf_max_resp, tvb, offset, 1, tsecs,
"Max Response Time: %.1f sec (0x%02x)", tsecs * 0.1, tsecs);
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
offset += 4;
proto_tree_add_uint(tree, hf_version, tvb, offset, 1,
tvb_get_guint8(tvb, offset));
offset += 1;
subtype = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_subtype, tvb, offset, 1, subtype);
offset += 2;
proto_tree_add_uint(tree, hf_challengeid, tvb, offset, 1,
tvb_get_guint8(tvb, offset));
offset += 1;
asize = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_asize, tvb, offset, 1, asize);
offset += 1;
msize = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_msize, tvb, offset, 1, msize);
offset += 3;
if (asize > 0) {
if (asize > ACCOUNT_SIZE) {
/* Bogus account size.
XXX - flag this? */
asize = ACCOUNT_SIZE;
}
tvb_memcpy(tvb, account, offset, asize);
account[asize] = '\0';
proto_tree_add_string(tree, hf_account, tvb, offset, asize, account);
}
offset += ACCOUNT_SIZE;
if (msize > 0) {
if (msize > MESSAGE_SIZE) {
/* Bogus message size.
XXX - flag this? */
msize = MESSAGE_SIZE;
}
tvb_memcpy(tvb, message, offset, msize);
switch (subtype) {
case IGAP_SUBTYPE_PASSWORD_JOIN:
case IGAP_SUBTYPE_PASSWORD_LEAVE:
/* Challenge field is user's password */
message[msize] = '\0';
proto_tree_add_text(tree, tvb, offset, msize,
"User password: %s", message);
break;
case IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN:
case IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE:
/* Challenge field is the results of MD5 calculation */
proto_tree_add_text(tree, tvb, offset, msize,
"Result of MD5 calculation: 0x%s",
bytes_to_str(message, msize));
break;
case IGAP_SUBTYPE_CHALLENGE:
/* Challenge field is the challenge value */
proto_tree_add_text(tree, tvb, offset, msize,
"Challenge: 0x%s",
bytes_to_str(message, msize));
break;
case IGAP_SUBTYPE_AUTH_MESSAGE:
/* Challenge field indicates the result of the authenticaion */
proto_tree_add_text(tree, tvb, offset, msize,
"Authentication result: %s (0x%x)",
val_to_str(message[0], igap_auth_result,
"Unknown"), message[0]);
break;
case IGAP_SUBTYPE_ACCOUNTING_MESSAGE:
/* Challenge field indicates the accounting status */
proto_tree_add_text(tree, tvb, offset, msize,
"Accounting status: %s (0x%x)",
val_to_str(message[0], igap_account_status,
"Unknown"), message[0]);
break;
default:
proto_tree_add_text(tree, tvb, offset, msize,
"Message: (Unknown)");
}
}
offset += MESSAGE_SIZE;
if (item) proto_item_set_len(item, offset);
return offset;
}
void
proto_register_igap(void)
{
static hf_register_info hf[] = {
{ &hf_type,
{ "Type", "igap.type", FT_UINT8, BASE_HEX,
VALS(igap_types), 0, "IGAP Packet Type", HFILL }
},
{ &hf_max_resp,
{ "Max Resp Time", "igap.max_resp", FT_UINT8, BASE_DEC,
NULL, 0, "Max Response Time", HFILL }
},
{ &hf_checksum,
{ "Checksum", "igap.checksum", FT_UINT16, BASE_HEX,
NULL, 0, "Checksum", HFILL }
},
{ &hf_checksum_bad,
{ "Bad Checksum", "igap.checksum_bad", FT_BOOLEAN, BASE_NONE,
NULL, 0, "Bad Checksum", HFILL }
},
{ &hf_maddr,
{ "Multicast group address", "igap.maddr", FT_IPv4, BASE_NONE,
NULL, 0, "Multicast group address", HFILL }
},
{ &hf_version,
{ "Version", "igap.version", FT_UINT8, BASE_HEX,
VALS(igap_version), 0, "IGAP protocol version", HFILL }
},
{ &hf_subtype,
{ "Subtype", "igap.subtype", FT_UINT8, BASE_HEX,
VALS(igap_subtypes), 0, "Subtype", HFILL }
},
{ &hf_challengeid,
{ "Challenge ID", "igap.challengeid", FT_UINT8, BASE_HEX,
NULL, 0, "Challenge ID", HFILL }
},
{ &hf_asize,
{ "Account Size", "igap.asize", FT_UINT8, BASE_DEC,
NULL, 0, "Length of the User Account field", HFILL }
},
{ &hf_msize,
{ "Message Size", "igap.msize", FT_UINT8, BASE_DEC,
NULL, 0, "Length of the Message field", HFILL }
},
{ &hf_account,
{ "User Account", "igap.account", FT_STRING, BASE_NONE,
NULL, 0, "User account", HFILL }
}
};
static gint *ett[] = {
&ett_igap
};
proto_igap = proto_register_protocol
("Internet Group membership Authentication Protocol",
"IGAP", "igap");
proto_register_field_array(proto_igap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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