diff options
Diffstat (limited to 'epan/dissectors/packet-nat-pmp.c')
-rw-r--r-- | epan/dissectors/packet-nat-pmp.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/epan/dissectors/packet-nat-pmp.c b/epan/dissectors/packet-nat-pmp.c new file mode 100644 index 0000000000..61340b5bda --- /dev/null +++ b/epan/dissectors/packet-nat-pmp.c @@ -0,0 +1,240 @@ +/* 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 Bjørlykke <stig@bjorlykke.org> + * + * $Id$ + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <epan/packet.h> +#include <epan/expert.h> + +#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 dissector_handle_t nat_pmp_handle = NULL; + +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; + + if (check_col (pinfo->cinfo, COL_PROTOCOL)) + col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME); + + if (check_col (pinfo->cinfo, COL_INFO)) + col_clear (pinfo->cinfo, COL_INFO); + + ti = proto_tree_add_item (tree, proto_nat_pmp, tvb, offset, -1, FALSE); + nat_pmp_tree = proto_item_add_subtree (ti, ett_nat_pmp); + + proto_tree_add_item (nat_pmp_tree, hf_version, tvb, offset, 1, FALSE); + 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, FALSE); + offset++; + + if (check_col (pinfo->cinfo, COL_INFO)) + col_set_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, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_sssoe, tvb, offset, 4, FALSE); + offset += 4; + + proto_tree_add_item (nat_pmp_tree, hf_external_ip, tvb, offset, 4, FALSE); + offset += 4; + break; + + case MAP_UDP_REQUEST: + case MAP_TCP_REQUEST: + proto_tree_add_item (nat_pmp_tree, hf_reserved, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_internal_port, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_external_port_requested, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_rpmlis, tvb, offset, 4, FALSE); + offset += 4; + break; + + case MAP_UDP_RESPONSE: + case MAP_TCP_RESPONSE: + proto_tree_add_item (nat_pmp_tree, hf_result_code, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_sssoe, tvb, offset, 4, FALSE); + offset += 4; + + proto_tree_add_item (nat_pmp_tree, hf_internal_port, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_external_port_mapped, tvb, offset, 2, FALSE); + offset += 2; + + proto_tree_add_item (nat_pmp_tree, hf_pmlis, tvb, offset, 4, FALSE); + 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) +{ + nat_pmp_handle = find_dissector (PFNAME); + dissector_add ("udp.port", NAT_PMP_STATUS_PORT, nat_pmp_handle); + dissector_add ("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 noexpandtab + * :indentSize=2:tabSize=8:noTabs=false: + */ |