/* packet-ccsds.c * Routines for CCSDS dissection * Copyright 2000, Scott Hovis scott.hovis@ums.msfc.nasa.gov * Enhanced 2008, Matt Dunkle Matthew.L.Dunkle@nasa.gov * * 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 #include #include void proto_register_ccsds(void); void proto_reg_handoff_ccsds(void); /* * See * * http://public.ccsds.org/publications/archive/133x0b1c1.pdf section 4.1 -- CCSDS 133.0-B-1 replaces CCSDS 701.0-B-2 * http://www.everyspec.com/NASA/NASA+-+JSC/NASA+-+SSP+PUBS/download.php?spec=SSP_52050E.003096.pdf section 3.1.3 * * for some information. */ /* Initialize the protocol and registered fields */ static int proto_ccsds = -1; /* primary ccsds header */ static int hf_ccsds_header_flags = -1; static int hf_ccsds_apid = -1; static int hf_ccsds_version = -1; static int hf_ccsds_secheader = -1; static int hf_ccsds_type = -1; static int hf_ccsds_seqnum = -1; static int hf_ccsds_seqflag = -1; static int hf_ccsds_length = -1; /* common ccsds secondary header */ static int hf_ccsds_coarse_time = -1; static int hf_ccsds_fine_time = -1; static int hf_ccsds_timeid = -1; static int hf_ccsds_checkword_flag = -1; /* payload specific ccsds secondary header */ static int hf_ccsds_zoe = -1; static int hf_ccsds_packet_type_unused = -1; static int hf_ccsds_vid = -1; static int hf_ccsds_dcc = -1; /* core specific ccsds secondary header */ /* static int hf_ccsds_spare1 = -1; */ static int hf_ccsds_packet_type = -1; /* static int hf_ccsds_spare2 = -1; */ static int hf_ccsds_element_id = -1; static int hf_ccsds_cmd_data_packet = -1; static int hf_ccsds_format_version_id = -1; static int hf_ccsds_extended_format_id = -1; /* static int hf_ccsds_spare3 = -1; */ static int hf_ccsds_frame_id = -1; static int hf_ccsds_embedded_time = -1; static int hf_ccsds_user_data = -1; /* ccsds checkword (checksum) */ static int hf_ccsds_checkword = -1; static int hf_ccsds_checkword_good = -1; static int hf_ccsds_checkword_bad = -1; /* Initialize the subtree pointers */ static gint ett_ccsds_primary_header_flags = -1; static gint ett_ccsds = -1; static gint ett_ccsds_primary_header = -1; static gint ett_ccsds_secondary_header = -1; static gint ett_ccsds_checkword = -1; static expert_field ei_ccsds_length_error = EI_INIT; static expert_field ei_ccsds_checkword = EI_INIT; static dissector_handle_t ccsds_handle; /* Dissector table */ static dissector_table_t ccsds_dissector_table; static const enum_val_t dissect_checkword[] = { { "hdr", "Use header flag", 2 }, { "no", "Override header flag to be false", 0 }, { "yes", "Override header flag to be true", 1 }, { NULL, NULL, 0 } }; /* Global preferences */ /* As defined above, default is to use header flag */ static gint global_dissect_checkword = 2; /* * Bits in the first 16-bit header word */ #define HDR_VERSION 0xe000 #define HDR_TYPE 0x1000 #define HDR_SECHDR 0x0800 #define HDR_APID 0x07ff /* some basic sizing parameters */ enum { IP_HEADER_LENGTH = 48, VCDU_HEADER_LENGTH = 6, CCSDS_PRIMARY_HEADER_LENGTH = 6, CCSDS_SECONDARY_HEADER_LENGTH = 10 }; /* leap year macro */ #ifndef Leap # define Leap(yr) ( ( 0 == (yr)%4 && 0 != (yr)%100 ) || ( 0 == (yr)%400 ) ) #endif static const value_string ccsds_primary_header_sequence_flags[] = { { 0, "Continuation segment" }, { 1, "First segment" }, { 2, "Last segment" }, { 3, "Unsegmented data" }, { 0, NULL } }; static const value_string ccsds_secondary_header_type[] = { { 0, "Core" }, { 1, "Payload" }, { 0, NULL } }; static const value_string ccsds_secondary_header_packet_type[] = { { 0, "UNDEFINED" }, { 1, "Data Dump" }, { 2, "UNDEFINED" }, { 3, "UNDEFINED" }, { 4, "TLM/Status" }, { 5, "UNDEFINED" }, { 6, "Payload Private/Science" }, { 7, "Ancillary Data" }, { 8, "Essential Cmd" }, { 9, "System Cmd" }, { 10, "Payload Cmd" }, { 11, "Data Load/File Transfer" }, { 12, "UNDEFINED" }, { 13, "UNDEFINED" }, { 14, "UNDEFINED" }, { 15, "UNDEFINED" }, { 0, NULL } }; static const value_string ccsds_secondary_header_element_id[] = { { 0, "NASA (Ground Test Only)" }, { 1, "NASA" }, { 2, "ESA/APM" }, { 3, "NASDA" }, { 4, "RSA" }, { 5, "CSA" }, { 6, "ESA/ATV" }, { 7, "ASI" }, { 8, "ESA/ERA" }, { 9, "Reserved" }, { 10, "RSA SPP" }, { 11, "NASDA HTV" }, { 12, "Reserved" }, { 13, "Reserved" }, { 14, "Reserved" }, { 15, "Reserved" }, { 0, NULL } }; static const value_string ccsds_secondary_header_cmd_data_packet[] = { { 0, "Command Packet" }, { 1, "Data Packet" }, { 0, NULL } }; static const value_string ccsds_secondary_header_format_id[] = { { 0, "Reserved" }, { 1, "Essential Telemetry" }, { 2, "Housekeeping Tlm - 1" }, { 3, "Housekeeping Tlm - 2" }, { 4, "PCS DDT" }, { 5, "CCS S-Band Command Response" }, { 6, "Contingency Telemetry via the SMCC" }, { 7, "Normal Data Dump" }, { 8, "Extended Data Dump" }, { 9, "Reserved" }, { 10, "Reserved" }, { 11, "Broadcast Ancillary Data" }, { 12, "Reserved" }, { 13, "NCS to OIU Telemetry and ECOMM Telemetry" }, { 14, "CCS to OIU Telemetry - Direct" }, { 15, "Reserved" }, { 16, "Normal File Dump" }, { 17, "Extended File Dump" }, { 18, "NCS to FGB Telemetry" }, { 19, "Reserved" }, { 20, "ZOE Normal Dump (S-Band)" }, { 21, "ZOE Extended Dump (S-Band)" }, { 22, "EMU S-Band TLM Packet" }, { 23, "Reserved" }, { 24, "Reserved" }, { 25, "Reserved" }, { 26, "CCS to OIU Telemetry via UHF" }, { 27, "OSTP Telemetry (After Flight 1E, CCS R5)" }, { 28, "Reserved" }, { 29, "Reserved" }, { 30, "Reserved" }, { 31, "Reserved" }, { 32, "Reserved" }, { 33, "Reserved" }, { 34, "Reserved" }, { 35, "Reserved" }, { 36, "Reserved" }, { 37, "Reserved" }, { 38, "Reserved" }, { 39, "Reserved" }, { 40, "Reserved" }, { 41, "Reserved" }, { 42, "Reserved" }, { 43, "Reserved" }, { 44, "Reserved" }, { 45, "Reserved" }, { 46, "Reserved" }, { 47, "Reserved" }, { 48, "Reserved" }, { 49, "Reserved" }, { 50, "Reserved" }, { 51, "Reserved" }, { 52, "Reserved" }, { 53, "Reserved" }, { 54, "Reserved" }, { 55, "Reserved" }, { 56, "Reserved" }, { 57, "Reserved" }, { 58, "Reserved" }, { 59, "Reserved" }, { 60, "Reserved" }, { 61, "Reserved" }, { 62, "Reserved" }, { 63, "Reserved" }, { 0, NULL } }; static value_string_ext ccsds_secondary_header_format_id_ext = VALUE_STRING_EXT_INIT(ccsds_secondary_header_format_id); /* convert ccsds embedded time to a human readable string - NOT THREAD SAFE */ static const char* embedded_time_to_string ( int coarse_time, int fine_time ) { static int utcdiff = 0; nstime_t t; int yr; int fraction; int multiplier = 1000; /* compute the static constant difference in seconds * between midnight 5-6 January 1980 (GPS time) and * seconds since 1/1/1970 (UTC time) just this once */ if ( 0 == utcdiff ) { for ( yr = 1970; yr < 1980; ++yr ) { utcdiff += ( Leap(yr) ? 366 : 365 ) * 24 * 60 * 60; } utcdiff += 5 * 24 * 60 * 60; /* five days of January 1980 */ } t.secs = coarse_time + utcdiff; fraction = ( multiplier * ( (int)fine_time & 0xff ) ) / 256; t.nsecs = fraction*1000000; /* msecs to nsecs */ return abs_time_to_str(wmem_packet_scope(), &t, ABSOLUTE_TIME_DOY_UTC, TRUE); } /* Code to actually dissect the packets */ static int dissect_ccsds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { int offset = 0; proto_item *ccsds_packet; proto_tree *ccsds_tree; proto_item *primary_header; proto_tree *primary_header_tree; guint16 first_word; guint32 coarse_time; guint8 fine_time; proto_item *secondary_header; proto_tree *secondary_header_tree; const char *time_string; gint ccsds_length; gint length = 0; gint reported_length; guint8 checkword_flag = 0; gint counter = 0; proto_item *item, *checkword_item = NULL; proto_tree *checkword_tree; guint16 checkword_field = 0; guint16 checkword_sum = 0; tvbuff_t *next_tvb; static const int * header_flags[] = { &hf_ccsds_version, &hf_ccsds_type, &hf_ccsds_secheader, &hf_ccsds_apid, NULL }; col_set_str(pinfo->cinfo, COL_PROTOCOL, "CCSDS"); col_set_str(pinfo->cinfo, COL_INFO, "CCSDS Packet"); first_word = tvb_get_ntohs(tvb, 0); col_add_fstr(pinfo->cinfo, COL_INFO, "APID %4d (0x%03X)", first_word&HDR_APID, first_word&HDR_APID); reported_length = tvb_reported_length_remaining(tvb, 0); ccsds_length = tvb_get_ntohs(tvb, 4) + CCSDS_PRIMARY_HEADER_LENGTH + 1; /* Min length is size of headers, whereas max length is reported length. * If the length field in the CCSDS header is outside of these bounds, * use the value it violates. Otherwise, use the length field value. */ if (ccsds_length > reported_length) length = reported_length; else if (ccsds_length < CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH) length = CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH; else length = ccsds_length; ccsds_packet = proto_tree_add_item(tree, proto_ccsds, tvb, 0, length, ENC_NA); ccsds_tree = proto_item_add_subtree(ccsds_packet, ett_ccsds); /* build the ccsds primary header tree */ primary_header_tree = proto_tree_add_subtree(ccsds_tree, tvb, offset, CCSDS_PRIMARY_HEADER_LENGTH, ett_ccsds_primary_header, &primary_header, "Primary CCSDS Header"); proto_tree_add_bitmask(primary_header_tree, tvb, offset, hf_ccsds_header_flags, ett_ccsds_primary_header_flags, header_flags, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(primary_header_tree, hf_ccsds_seqflag, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item(primary_header_tree, hf_ccsds_seqnum, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; item = proto_tree_add_item(primary_header_tree, hf_ccsds_length, tvb, offset, 2, ENC_BIG_ENDIAN); if (ccsds_length > reported_length) { expert_add_info(pinfo, item, &ei_ccsds_length_error); } offset += 2; proto_item_set_end(primary_header, tvb, offset); /* build the ccsds secondary header tree */ if ( first_word & HDR_SECHDR ) { secondary_header_tree = proto_tree_add_subtree(ccsds_tree, tvb, offset, CCSDS_SECONDARY_HEADER_LENGTH, ett_ccsds_secondary_header, &secondary_header, "Secondary CCSDS Header"); /* command ccsds secondary header flags */ coarse_time = tvb_get_ntohl(tvb, offset); proto_tree_add_item(secondary_header_tree, hf_ccsds_coarse_time, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; fine_time = tvb_get_guint8(tvb, offset); proto_tree_add_item(secondary_header_tree, hf_ccsds_fine_time, tvb, offset, 1, ENC_BIG_ENDIAN); ++offset; time_string = embedded_time_to_string ( coarse_time, fine_time ); proto_tree_add_string(secondary_header_tree, hf_ccsds_embedded_time, tvb, offset-5, 5, time_string); proto_tree_add_item(secondary_header_tree, hf_ccsds_timeid, tvb, offset, 1, ENC_BIG_ENDIAN); checkword_item = proto_tree_add_item(secondary_header_tree, hf_ccsds_checkword_flag, tvb, offset, 1, ENC_BIG_ENDIAN); /* Global Preference: how to handle checkword flag */ switch (global_dissect_checkword) { case 0: /* force checkword presence flag to be false */ checkword_flag = 0; break; case 1: /* force checkword presence flag to be true */ checkword_flag = 1; break; default: /* use value of checkword presence flag from header */ checkword_flag = (tvb_get_guint8(tvb, offset)&0x20) >> 5; break; } /* payload specific ccsds secondary header flags */ if ( first_word & HDR_TYPE ) { proto_tree_add_item(secondary_header_tree, hf_ccsds_zoe, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(secondary_header_tree, hf_ccsds_packet_type_unused, tvb, offset, 1, ENC_BIG_ENDIAN); ++offset; proto_tree_add_item(secondary_header_tree, hf_ccsds_vid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(secondary_header_tree, hf_ccsds_dcc, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; } /* core specific ccsds secondary header flags */ else { /* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare1, tvb, offset, 1, ENC_BIG_ENDIAN); */ proto_tree_add_item(secondary_header_tree, hf_ccsds_packet_type, tvb, offset, 1, ENC_BIG_ENDIAN); ++offset; /* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare2, tvb, offset, 2, ENC_BIG_ENDIAN); */ proto_tree_add_item(secondary_header_tree, hf_ccsds_element_id, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item(secondary_header_tree, hf_ccsds_cmd_data_packet, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item(secondary_header_tree, hf_ccsds_format_version_id, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item(secondary_header_tree, hf_ccsds_extended_format_id, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; /* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare3, tvb, offset, 1, ENC_BIG_ENDIAN); */ ++offset; proto_tree_add_item(secondary_header_tree, hf_ccsds_frame_id, tvb, offset, 1, ENC_BIG_ENDIAN); ++offset; } /* finish the ccsds secondary header */ proto_item_set_end(secondary_header, tvb, offset); } /* If there wasn't a full packet, then don't allow a tree item for checkword. */ if (reported_length < ccsds_length || ccsds_length < CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH) { /* Label CCSDS payload 'User Data' */ if (length > offset) proto_tree_add_item(ccsds_tree, hf_ccsds_user_data, tvb, offset, length-offset, ENC_NA); offset += length-offset; if (checkword_flag == 1) expert_add_info(pinfo, checkword_item, &ei_ccsds_checkword); } /* Handle checkword according to CCSDS preference setting. */ else { next_tvb = tvb_new_subset_remaining(tvb, offset); /* Look for a subdissector for the CCSDS payload */ if (!dissector_try_uint(ccsds_dissector_table, first_word&HDR_APID, next_tvb, pinfo, tree)) { /* If no subdissector is found, label the CCSDS payload as 'User Data' */ proto_tree_add_item(ccsds_tree, hf_ccsds_user_data, tvb, offset, length-offset-2*checkword_flag, ENC_NA); } offset += length-offset-2*checkword_flag; /* If checkword is present, calculate packet checksum (16-bit running sum) for comparison */ if (checkword_flag == 1) { /* don't count the checkword as part of the checksum */ while (counter < ccsds_length-2) { checkword_sum += tvb_get_ntohs(tvb, counter); counter += 2; } checkword_field = tvb_get_ntohs(tvb, offset); /* Report checkword status */ if (checkword_sum == checkword_field) { item = proto_tree_add_uint_format_value(ccsds_tree, hf_ccsds_checkword, tvb, offset, 2, checkword_field, "0x%04x [correct]", checkword_field); checkword_tree = proto_item_add_subtree(item, ett_ccsds_checkword); item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_good, tvb, offset, 2, TRUE); PROTO_ITEM_SET_GENERATED(item); item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_bad, tvb, offset, 2, FALSE); PROTO_ITEM_SET_GENERATED(item); } else { item = proto_tree_add_uint_format_value(ccsds_tree, hf_ccsds_checkword, tvb, offset, 2, checkword_field, "0x%04x [incorrect, should be 0x%04x]", checkword_field, checkword_sum); checkword_tree = proto_item_add_subtree(item, ett_ccsds_checkword); item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_good, tvb, offset, 2, FALSE); PROTO_ITEM_SET_GENERATED(item); item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_bad, tvb, offset, 2, TRUE); PROTO_ITEM_SET_GENERATED(item); } offset += 2; } } /* Give the data dissector any bytes past the CCSDS packet length */ call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, tree); return tvb_captured_length(tvb); } void proto_register_ccsds(void) { static hf_register_info hf[] = { /* primary ccsds header flags */ { &hf_ccsds_header_flags, { "Header Flags", "ccsds.header_flags", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_ccsds_version, { "Version", "ccsds.version", FT_UINT16, BASE_DEC, NULL, HDR_VERSION, NULL, HFILL } }, { &hf_ccsds_type, { "Type", "ccsds.type", FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_type), HDR_TYPE, NULL, HFILL } }, { &hf_ccsds_secheader, { "Secondary Header", "ccsds.secheader", FT_BOOLEAN, 16, NULL, HDR_SECHDR, "Secondary Header Present", HFILL } }, { &hf_ccsds_apid, { "APID", "ccsds.apid", FT_UINT16, BASE_DEC, NULL, HDR_APID, NULL, HFILL } }, { &hf_ccsds_seqflag, { "Sequence Flags", "ccsds.seqflag", FT_UINT16, BASE_DEC, VALS(ccsds_primary_header_sequence_flags), 0xc000, NULL, HFILL } }, { &hf_ccsds_seqnum, { "Sequence Number", "ccsds.seqnum", FT_UINT16, BASE_DEC, NULL, 0x3fff, NULL, HFILL } }, { &hf_ccsds_length, { "Packet Length", "ccsds.length", FT_UINT16, BASE_DEC, NULL, 0xffff, NULL, HFILL } }, /* common ccsds secondary header flags */ { &hf_ccsds_coarse_time, { "Coarse Time", "ccsds.coarse_time", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_ccsds_fine_time, { "Fine Time", "ccsds.fine_time", FT_UINT8, BASE_DEC, NULL, 0xff, NULL, HFILL } }, { &hf_ccsds_timeid, { "Time Identifier", "ccsds.timeid", FT_UINT8, BASE_DEC, NULL, 0xc0, NULL, HFILL } }, { &hf_ccsds_checkword_flag, { "Checkword Indicator", "ccsds.checkword_flag", FT_BOOLEAN, 8, NULL, 0x20, "Checkword present", HFILL } }, /* payload specific ccsds secondary header flags */ { &hf_ccsds_zoe, { "ZOE TLM", "ccsds.zoe", FT_UINT8, BASE_DEC, NULL, 0x10, "Contains S-band ZOE Packets", HFILL } }, { &hf_ccsds_packet_type_unused, { "Packet Type (unused for Ku-band)", "ccsds.packet_type", FT_UINT8, BASE_DEC, NULL, 0x0f, NULL, HFILL } }, { &hf_ccsds_vid, { "Version Identifier", "ccsds.vid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_ccsds_dcc, { "Data Cycle Counter", "ccsds.dcc", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, /* core specific ccsds secondary header flags */ #if 0 { &hf_ccsds_spare1, { "Spare Bit 1", "ccsds.spare1", FT_UINT8, BASE_DEC, NULL, 0x10, "unused spare bit 1", HFILL } }, #endif { &hf_ccsds_packet_type, { "Packet Type", "ccsds.packet_type", FT_UINT8, BASE_DEC, VALS(ccsds_secondary_header_packet_type), 0x0f, NULL, HFILL } }, #if 0 { &hf_ccsds_spare2, { "Spare Bit 2", "ccsds.spare2", FT_UINT16, BASE_DEC, NULL, 0x8000, NULL, HFILL } }, #endif { &hf_ccsds_element_id, { "Element ID", "ccsds.element_id", FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_element_id), 0x7800, NULL, HFILL } }, { &hf_ccsds_cmd_data_packet, { "Cmd/Data Packet Indicator", "ccsds.cmd_data_packet", FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_cmd_data_packet), 0x0400, NULL, HFILL } }, { &hf_ccsds_format_version_id, { "Format Version ID", "ccsds.format_version_id", FT_UINT16, BASE_DEC, NULL, 0x03c0, NULL, HFILL } }, { &hf_ccsds_extended_format_id, { "Extended Format ID", "ccsds.extended_format_id", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &ccsds_secondary_header_format_id_ext, 0x003f, NULL, HFILL } }, #if 0 { &hf_ccsds_spare3, { "Spare Bits 3", "ccsds.spare3", FT_UINT8, BASE_DEC, NULL, 0xff, NULL, HFILL } }, #endif { &hf_ccsds_frame_id, { "Frame ID", "ccsds.frame_id", FT_UINT8, BASE_DEC, NULL, 0xff, NULL, HFILL } }, { &hf_ccsds_embedded_time, { "Embedded Time", "ccsds.embedded_time", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_ccsds_user_data, { "User Data", "ccsds.user_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_ccsds_checkword, { "CCSDS checkword", "ccsds.checkword", FT_UINT16, BASE_HEX, NULL, 0x0, "CCSDS checkword: 16-bit running sum of all bytes excluding the checkword", HFILL } }, { &hf_ccsds_checkword_good, { "Good", "ccsds.checkword_good", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "True: checkword matches packet content; False: doesn't match content", HFILL } }, { &hf_ccsds_checkword_bad, { "Bad", "ccsds.checkword_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "True: checkword doesn't match packet content; False: matches content", HFILL } } }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_ccsds_primary_header_flags, &ett_ccsds, &ett_ccsds_primary_header, &ett_ccsds_secondary_header, &ett_ccsds_checkword }; static ei_register_info ei[] = { { &ei_ccsds_length_error, { "ccsds.length.error", PI_MALFORMED, PI_ERROR, "Length field value is greater than the packet seen on the wire", EXPFILL }}, { &ei_ccsds_checkword, { "ccsds.no_checkword", PI_PROTOCOL, PI_WARN, "Packet does not contain a Checkword", EXPFILL }}, }; /* Define the CCSDS preferences module */ module_t *ccsds_module; expert_module_t* expert_ccsds; /* Register the protocol name and description */ proto_ccsds = proto_register_protocol("CCSDS", "CCSDS", "ccsds"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_ccsds, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); expert_ccsds = expert_register_protocol(proto_ccsds); expert_register_field_array(expert_ccsds, ei, array_length(ei)); ccsds_handle = register_dissector ( "ccsds", dissect_ccsds, proto_ccsds ); /* Register preferences module */ ccsds_module = prefs_register_protocol(proto_ccsds, NULL); prefs_register_enum_preference(ccsds_module, "global_pref_checkword", "How to handle the CCSDS checkword", "Specify how the dissector should handle the CCSDS checkword", &global_dissect_checkword, dissect_checkword, FALSE); /* Dissector table for sub-dissetors */ ccsds_dissector_table = register_dissector_table("ccsds.apid", "CCSDS apid", proto_ccsds, FT_UINT16, BASE_DEC); } void proto_reg_handoff_ccsds(void) { dissector_add_for_decode_as_with_preference( "udp.port", ccsds_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: */