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wireshark/epan/dissectors/packet-igap.c

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/* packet-igap.c
* Routines for IGMP/IGAP packet disassembly
* 2003, Endoh Akria (see AUTHORS for email)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-igmp.h"
void proto_register_igap(void);
void proto_reg_handoff_igap(void);
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_status = -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;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_igap_challenge = -1;
static int hf_igap_user_password = -1;
static int hf_igap_authentication_result = -1;
static int hf_igap_result_of_md5_calculation = -1;
static int hf_igap_accounting_status = -1;
static int hf_igap_unknown_message = -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 */
static int
dissect_igap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
proto_tree *tree;
proto_item *item;
guint8 type, tsecs, subtype, asize, msize;
int offset = 0;
guchar account[ACCOUNT_SIZE+1], message[MESSAGE_SIZE+1];
item = proto_tree_add_item(parent_tree, proto_igap, tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_igap);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGAP");
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_guint8(tvb, offset);
col_add_str(pinfo->cinfo, COL_INFO,
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_value(tree, hf_max_resp, tvb, offset, 1, tsecs,
"%.1f sec (0x%02x)", tsecs * 0.1, tsecs);
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_status, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
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_string(tree, hf_igap_user_password, tvb, offset, msize, 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_item(tree, hf_igap_result_of_md5_calculation, tvb, offset, msize, ENC_NA);
break;
case IGAP_SUBTYPE_CHALLENGE:
/* Challenge field is the challenge value */
proto_tree_add_item(tree, hf_igap_challenge, tvb, offset, msize, ENC_NA);
break;
case IGAP_SUBTYPE_AUTH_MESSAGE:
/* Challenge field indicates the result of the authentication */
proto_tree_add_uint(tree, hf_igap_authentication_result, tvb, offset, msize, message[0]);
break;
case IGAP_SUBTYPE_ACCOUNTING_MESSAGE:
/* Challenge field indicates the accounting status */
proto_tree_add_uint(tree, hf_igap_accounting_status, tvb, offset, msize, message[0]);
break;
default:
proto_tree_add_item(tree, hf_igap_unknown_message, tvb, offset, msize, ENC_NA);
}
}
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 Response Time", "igap.max_resp",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_checksum,
{ "Checksum", "igap.checksum",
FT_UINT16, BASE_HEX, NULL, 0,
NULL, HFILL }
},
{ &hf_checksum_status,
{ "Checksum Status", "igap.checksum.status",
FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
NULL, HFILL }
},
{ &hf_maddr,
{ "Multicast group address", "igap.maddr",
FT_IPv4, BASE_NONE, NULL, 0,
NULL, 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,
NULL, HFILL }
},
{ &hf_challengeid,
{ "Challenge ID", "igap.challengeid",
FT_UINT8, BASE_HEX, NULL, 0,
NULL, 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,
NULL, HFILL }
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_igap_user_password,
{ "User password", "igap.user_password",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_igap_result_of_md5_calculation,
{ "Result of MD5 calculation", "igap.result_of_md5_calculation",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_igap_challenge,
{ "Challenge", "igap.challenge",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_igap_authentication_result,
{ "Authentication result", "igap.authentication_result",
FT_UINT8, BASE_HEX, VALS(igap_auth_result), 0x0,
NULL, HFILL }
},
{ &hf_igap_accounting_status,
{ "Accounting status", "igap.accounting_status",
FT_UINT8, BASE_HEX, VALS(igap_account_status), 0x0,
NULL, HFILL }
},
{ &hf_igap_unknown_message,
{ "Unknown message", "igap.unknown_message",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, 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));
}
void
proto_reg_handoff_igap(void)
{
dissector_handle_t igap_handle;
igap_handle = create_dissector_handle(dissect_igap, proto_igap);
dissector_add_uint("igmp.type", IGMP_IGAP_JOIN, igap_handle);
dissector_add_uint("igmp.type", IGMP_IGAP_QUERY, igap_handle);
dissector_add_uint("igmp.type", IGMP_IGAP_LEAVE, igap_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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