/* packet-igap.c * Routines for IGMP/IGAP packet disassembly * 2003, Endoh Akria (see AUTHORS for email) * * $Id: packet-igap.c,v 1.1 2003/12/10 19:21:55 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * 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 #include #include #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} }; /* 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, account[17], message[65]; 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) { tvb_memcpy(tvb, account, offset, asize); account[asize] = '\0'; proto_tree_add_string(tree, hf_account, tvb, offset, asize, account); } offset += 16; if (msize > 0) { 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 += 64; 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)); }