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wireshark/epan/dissectors/packet-ccsds.c

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/* 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 <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include <epan/to_str.h>
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 int * const 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 - https://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:
*/
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