/* packet-nat-pmp.c * Routines for NAT Port Mapping Protocol packet disassembly. * draft-cheshire-nat-pmp-03 * http://files.dns-sd.org/draft-cheshire-nat-pmp.txt * * Copyright 2009, Stig Bjorlykke * * $Id$ * * Wireshark - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #define PNAME "NAT Port Mapping Protocol" #define PSNAME "NAT-PMP" #define PFNAME "nat-pmp" #define NAT_PMP_STATUS_PORT 5350 #define NAT_PMP_PORT 5351 /* opcodes */ #define EXTERNAL_ADDRESS_REQUEST 0 #define MAP_UDP_REQUEST 1 #define MAP_TCP_REQUEST 2 #define EXTERNAL_ADDRESS_RESPONSE 128 #define MAP_UDP_RESPONSE 129 #define MAP_TCP_RESPONSE 130 static int proto_nat_pmp = -1; static int hf_version = -1; static int hf_opcode = -1; static int hf_result_code = -1; static int hf_sssoe = -1; static int hf_external_ip = -1; static int hf_reserved = -1; static int hf_internal_port = -1; static int hf_external_port_requested = -1; static int hf_external_port_mapped = -1; static int hf_rpmlis = -1; static int hf_pmlis = -1; static gint ett_nat_pmp = -1; static const value_string opcode_vals[] = { { EXTERNAL_ADDRESS_REQUEST, "External Address Request" }, { EXTERNAL_ADDRESS_RESPONSE, "External Address Response" }, { MAP_UDP_REQUEST, "Map UDP Request" }, { MAP_UDP_RESPONSE, "Map UDP Response" }, { MAP_TCP_REQUEST, "Map TCP Request" }, { MAP_TCP_RESPONSE, "Map TCP Response" }, { 0, NULL } }; static const value_string result_vals[] = { { 0, "Success" }, { 1, "Unsupported Version" }, { 2, "Not Authorized/Refused" }, { 3, "Network Failure" }, { 4, "Out of resources" }, { 5, "Unsupported opcode" }, { 0, NULL } }; static void dissect_nat_pmp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *nat_pmp_tree; proto_item *ti, *op_ti; gint offset = 0; guint8 opcode; col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME); col_clear (pinfo->cinfo, COL_INFO); ti = proto_tree_add_item (tree, proto_nat_pmp, tvb, offset, -1, ENC_NA); nat_pmp_tree = proto_item_add_subtree (ti, ett_nat_pmp); proto_tree_add_item (nat_pmp_tree, hf_version, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; opcode = tvb_get_guint8 (tvb, offset); proto_item_append_text (ti, ", %s", val_to_str (opcode, opcode_vals, "Unknown opcode: %d")); op_ti = proto_tree_add_item (nat_pmp_tree, hf_opcode, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; col_add_str (pinfo->cinfo, COL_INFO, val_to_str (opcode, opcode_vals, "Unknown opcode: %d")); switch (opcode) { case EXTERNAL_ADDRESS_REQUEST: /* No more data */ break; case EXTERNAL_ADDRESS_RESPONSE: proto_tree_add_item (nat_pmp_tree, hf_result_code, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_sssoe, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; proto_tree_add_item (nat_pmp_tree, hf_external_ip, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; break; case MAP_UDP_REQUEST: case MAP_TCP_REQUEST: proto_tree_add_item (nat_pmp_tree, hf_reserved, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_internal_port, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_external_port_requested, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_rpmlis, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; break; case MAP_UDP_RESPONSE: case MAP_TCP_RESPONSE: proto_tree_add_item (nat_pmp_tree, hf_result_code, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_sssoe, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; proto_tree_add_item (nat_pmp_tree, hf_internal_port, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_external_port_mapped, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item (nat_pmp_tree, hf_pmlis, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; break; default: /* Unknown OP */ expert_add_info_format (pinfo, op_ti, PI_RESPONSE_CODE, PI_WARN, "Unknown opcode: %d", opcode); break; } } void proto_register_nat_pmp (void) { static hf_register_info hf[] = { { &hf_version, { "Version", "nat-pmp.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_opcode, { "Opcode", "nat-pmp.opcode", FT_UINT8, BASE_DEC, VALS(opcode_vals), 0x0, NULL, HFILL } }, { &hf_result_code, { "Result Code", "nat-pmp.result_code", FT_UINT16, BASE_DEC, VALS(result_vals), 0x0, NULL, HFILL } }, { &hf_sssoe, { "Seconds Since Start of Epoch", "nat-pmp.sssoe", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_external_ip, { "External IP Address", "nat-pmp.external_ip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_reserved, { "Reserved", "nat-pmp.reserved", FT_UINT16, BASE_DEC, NULL, 0x0, "Reserved (must be zero)", HFILL } }, { &hf_internal_port, { "Internal Port", "nat-pmp.internal_port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_external_port_requested, { "Requested External Port", "nat-pmp.external_port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_external_port_mapped, { "Mapped External Port", "nat-pmp.external_port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_rpmlis, { "Requested Port Mapping Lifetime", "nat-pmp.pml", FT_UINT32, BASE_DEC, NULL, 0x0, "Requested Port Mapping Lifetime in Seconds", HFILL } }, { &hf_pmlis, { "Port Mapping Lifetime", "nat-pmp.pml", FT_UINT32, BASE_DEC, NULL, 0x0, "Port Mapping Lifetime in Seconds", HFILL } }, }; static gint *ett[] = { &ett_nat_pmp, }; proto_nat_pmp = proto_register_protocol (PNAME, PSNAME, PFNAME); register_dissector (PFNAME, dissect_nat_pmp, proto_nat_pmp); proto_register_field_array (proto_nat_pmp, hf, array_length (hf)); proto_register_subtree_array (ett, array_length (ett)); } void proto_reg_handoff_nat_pmp (void) { dissector_handle_t nat_pmp_handle; nat_pmp_handle = find_dissector (PFNAME); dissector_add_uint ("udp.port", NAT_PMP_STATUS_PORT, nat_pmp_handle); dissector_add_uint ("udp.port", NAT_PMP_PORT, nat_pmp_handle); } /* * Editor modelines * * Local Variables: * c-basic-offset: 2 * tab-width: 8 * indent-tabs-mode: nil * End: * * ex: set shiftwidth=2 tabstop=8 expandtab: * :indentSize=2:tabSize=8:noTabs=true: */