/* packet-fmtp.c * * Routines for FMTP version 2 packet dissection. * * The specifications of this public protocol can be found on Eurocontrol web site: * http://www.eurocontrol.int/sites/default/files/publication/files/20070614-fmtp-spec-v2.0.pdf * * Copyright 2011, Christophe Paletou * * 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. */ #include "config.h" #include #include "packet-tcp.h" void proto_register_fmtp(void); void proto_reg_handoff_fmtp(void); static int proto_fmtp = -1; static int hf_fmtp_pdu_version = -1; static int hf_fmtp_pdu_reserved = -1; static int hf_fmtp_pdu_type = -1; static int hf_fmtp_pdu_length = -1; static gint ett_fmtp = -1; /* #define TCP_PORT_FMTP 8500 */ #define FMTP_HEADER_LEN 5 #define FMTP_MAX_DATA_LEN 10240 #define FMTP_MAX_LEN FMTP_HEADER_LEN + FMTP_MAX_DATA_LEN #define FMTP_TYP_OPERATIONAL 1 #define FMTP_TYP_OPERATOR 2 #define FMTP_TYP_IDENTIFICATION 3 #define FMTP_TYP_SYSTEM 4 #define INFO_STR_SIZE 1024 static const value_string packet_type_names[] = { { FMTP_TYP_OPERATIONAL, "Operational message" }, { FMTP_TYP_OPERATOR, "Operator message" }, { FMTP_TYP_IDENTIFICATION, "Identification message" }, { FMTP_TYP_SYSTEM , "System message" }, { 0, NULL } }; static const value_string system_message_names[] = { { 12337, "Startup" }, /* 0x3031 */ { 12336, "Shutdown" }, /* 0x3030 */ { 12339, "Heartbeat" }, /* 0x3033 */ { 0, NULL } }; static int dissect_fmtp_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { guint8 packet_type; guint16 packet_len; tvbuff_t *next_tvb; proto_item *ti = NULL; proto_tree *fmtp_tree = NULL; packet_type = tvb_get_guint8(tvb, 4); packet_len = tvb_get_ntohs(tvb, 2); col_set_str(pinfo->cinfo, COL_PROTOCOL, "FMTP"); /* Clear out stuff in the info column */ col_clear(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_fmtp, tvb, 0, -1, ENC_NA); proto_item_append_text(ti, ", %s", val_to_str(packet_type, packet_type_names, "Unknown (0x%02x)")); switch (packet_type) { case FMTP_TYP_IDENTIFICATION: proto_item_append_text(ti, " (%s)", tvb_get_string_enc(wmem_packet_scope(), tvb, FMTP_HEADER_LEN, packet_len-FMTP_HEADER_LEN, ENC_ASCII)); col_add_fstr(pinfo->cinfo, COL_INFO, "%s (%s)", val_to_str(packet_type, packet_type_names, "Unknown (0x%02x)"), tvb_get_string_enc(wmem_packet_scope(), tvb, FMTP_HEADER_LEN, packet_len-FMTP_HEADER_LEN, ENC_ASCII)); break; case FMTP_TYP_SYSTEM: proto_item_append_text(ti, " (%s)", tvb_get_string_enc(wmem_packet_scope(), tvb, FMTP_HEADER_LEN, packet_len-FMTP_HEADER_LEN, ENC_ASCII)); col_add_fstr(pinfo->cinfo, COL_INFO, "%s (%s)", val_to_str(packet_type, packet_type_names, "Unknown (0x%02x)"), val_to_str(tvb_get_ntohs(tvb, FMTP_HEADER_LEN), system_message_names, "Unknown (0x%02x)")); break; default: col_add_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str(packet_type, packet_type_names, "Unknown (0x%02x)")); break; } if (tree) { /* we are being asked for details */ fmtp_tree = proto_item_add_subtree(ti, ett_fmtp); proto_tree_add_item(fmtp_tree, hf_fmtp_pdu_version, tvb, 0, 1, ENC_BIG_ENDIAN); proto_tree_add_item(fmtp_tree, hf_fmtp_pdu_reserved, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(fmtp_tree, hf_fmtp_pdu_length, tvb, 2, 2, ENC_BIG_ENDIAN); proto_tree_add_item(fmtp_tree, hf_fmtp_pdu_type, tvb, 4, 1, ENC_BIG_ENDIAN); next_tvb = tvb_new_subset_remaining(tvb, FMTP_HEADER_LEN); call_data_dissector(next_tvb, pinfo, fmtp_tree); } return tvb_captured_length(tvb); } static guint get_fmtp_message_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_) { return (guint)tvb_get_ntohs(tvb, offset+2); } static gboolean dissect_fmtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { guint16 length; if (tvb_captured_length(tvb) < 5) return FALSE; /* * Check that packet looks like FMTP before going further */ /* VERSION must currently be 0x02 */ if (tvb_get_guint8(tvb, 0) != 0x02) return (FALSE); /* RESERVED must currently be 0x00 */ if (tvb_get_guint8(tvb, 1) != 0x00) return (FALSE); length = tvb_get_ntohs(tvb, 2); /* LENGTH must currently not exceed 5 (header) + 10240 (data) */ if ((length > FMTP_MAX_LEN) || (length < FMTP_HEADER_LEN)) return (FALSE); /* TYP must currently be in range 0x01-0x04 */ if ((tvb_get_guint8(tvb, 4) < 0x01) || (tvb_get_guint8(tvb, 4) > 0x04)) return (FALSE); tcp_dissect_pdus(tvb, pinfo, tree, TRUE, FMTP_HEADER_LEN, get_fmtp_message_len, dissect_fmtp_message, data); return (TRUE); } void proto_register_fmtp(void) { static hf_register_info hf[] = { { &hf_fmtp_pdu_version, { "Version", "fmtp.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_fmtp_pdu_reserved, { "Reserved", "fmtp.reserved", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_fmtp_pdu_length, { "Length", "fmtp.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_fmtp_pdu_type, { "Type", "fmtp.type", FT_UINT8, BASE_DEC, VALS(packet_type_names), 0x0, NULL, HFILL } } }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_fmtp }; proto_fmtp = proto_register_protocol( "Flight Message Transfer Protocol (FMTP)", "FMTP", "fmtp"); proto_register_field_array(proto_fmtp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_fmtp(void) { /* Register as heuristic dissector for TCP */ heur_dissector_add("tcp", dissect_fmtp, "FMTP over TCP", "fmtp_tcp", proto_fmtp, HEURISTIC_ENABLE); } /* * 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: */