forked from osmocom/wireshark
260 lines
7.5 KiB
C
260 lines
7.5 KiB
C
/* packet-ccsds.c
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* Routines for CCSDS dissection
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* Copyright 2000, Scott Hovis scott.hovis@ums.msfc.nasa.gov
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*
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* $Id: packet-ccsds.c,v 1.3 2003/12/05 22:33:11 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <epan/packet.h>
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/*
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* See
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*
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* http://stationpayloads.jsc.nasa.gov/J-reference/documents/ssp57002B.pdf
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*/
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/* Initialize the protocol and registered fields */
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static int proto_ccsds = -1;
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static int hf_ccsds_apid = -1;
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static int hf_ccsds_version = -1;
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static int hf_ccsds_secheader = -1;
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static int hf_ccsds_type = -1;
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static int hf_ccsds_seqnum = -1;
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static int hf_ccsds_seqflag = -1;
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static int hf_ccsds_length = -1;
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static int hf_ccsds_time = -1;
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static int hf_ccsds_timeid = -1;
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static int hf_ccsds_checkword = -1;
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static int hf_ccsds_zoe = -1;
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static int hf_ccsds_packtype = -1;
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static int hf_ccsds_vid = -1;
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static int hf_ccsds_dcc = -1;
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/* Initialize the subtree pointers */
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static gint ett_ccsds = -1;
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static gint ett_header = -1;
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static gint ett_header2 = -1;
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/*
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* Bits in the first 16-bit header word
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*/
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#define HDR_VERSION 0xe000
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#define HDR_TYPE 0x1000
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#define HDR_SECHDR 0x0800
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#define HDR_APID 0x07ff
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/* Code to actually dissect the packets */
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static void
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dissect_ccsds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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proto_item *ti;
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proto_tree *ccsds_tree;
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proto_item *header;
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proto_tree *header_tree;
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guint16 first_word;
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proto_item *header2;
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proto_tree *header2_tree;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CCSDS");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "CCSDS Packet");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ccsds, tvb, 0, -1, FALSE);
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ccsds_tree = proto_item_add_subtree(ti, ett_ccsds);
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header=proto_tree_add_text(ccsds_tree, tvb, 0, -1,
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"Primary CCSDS Header");
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header_tree=proto_item_add_subtree(header, ett_header);
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first_word=tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(header_tree, hf_ccsds_version, tvb, offset, 2, first_word);
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proto_tree_add_uint(header_tree, hf_ccsds_type, tvb, offset, 2, first_word);
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proto_tree_add_boolean(header_tree, hf_ccsds_secheader, tvb, offset, 2, first_word);
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proto_tree_add_uint(header_tree, hf_ccsds_apid, tvb, offset, 2, first_word);
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offset += 2;
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proto_tree_add_item(header_tree, hf_ccsds_seqflag, tvb, offset, 2, FALSE);
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proto_tree_add_item(header_tree, hf_ccsds_seqnum, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(header_tree, hf_ccsds_length, tvb, offset, 2, FALSE);
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offset += 2;
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proto_item_set_end(header, tvb, offset);
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if(first_word&HDR_SECHDR)
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{
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header2=proto_tree_add_text(ccsds_tree, tvb, offset, -1,
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"Secondary CCSDS Header");
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header2_tree=proto_item_add_subtree(header2, ett_header2);
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proto_tree_add_item(header2_tree, hf_ccsds_time, tvb, offset, 5, FALSE);
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offset += 5;
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proto_tree_add_item(header2_tree, hf_ccsds_timeid, tvb, offset, 1, FALSE);
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proto_tree_add_item(header2_tree, hf_ccsds_checkword, tvb, offset, 1, FALSE);
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proto_tree_add_item(header2_tree, hf_ccsds_zoe, tvb, offset, 1, FALSE);
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proto_tree_add_item(header2_tree, hf_ccsds_packtype, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(header2_tree, hf_ccsds_vid, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(header2_tree, hf_ccsds_dcc, tvb, offset, 2, FALSE);
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offset += 2;
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proto_item_set_end(header2, tvb, offset);
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}
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proto_tree_add_text(ccsds_tree, tvb, offset, -1,
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"Data");
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}
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}
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/* Register the protocol with Ethereal */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_ccsds(void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_ccsds_version,
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{ "version", "ccsds.version",
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FT_UINT16, BASE_DEC, NULL, HDR_VERSION,
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"version", HFILL }
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},
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{ &hf_ccsds_type,
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{ "type", "ccsds.type",
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FT_UINT16, BASE_DEC, NULL, HDR_TYPE,
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"type", HFILL }
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},
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{ &hf_ccsds_secheader,
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{ "secondary header", "ccsds.secheader",
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FT_BOOLEAN, 16, NULL, HDR_SECHDR,
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"secondary header present", HFILL }
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},
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{ &hf_ccsds_apid,
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{ "APID", "ccsds.apid",
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FT_UINT16, BASE_DEC, NULL, HDR_APID,
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"Represents APID", HFILL }
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},
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{ &hf_ccsds_seqflag,
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{ "sequence flags", "ccsds.seqflag",
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FT_UINT16, BASE_DEC, NULL, 0xc000,
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"sequence flags", HFILL }
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},
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{ &hf_ccsds_seqnum,
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{ "sequence number", "ccsds.seqnum",
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FT_UINT16, BASE_DEC, NULL, 0x3fff,
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"sequence number", HFILL }
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},
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{ &hf_ccsds_length,
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{ "packet length", "ccsds.length",
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FT_UINT16, BASE_DEC, NULL, 0xffff,
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"packet length", HFILL }
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},
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{ &hf_ccsds_time,
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{ "time", "ccsds.time",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"time", HFILL }
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},
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{ &hf_ccsds_timeid,
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{ "time identifier", "ccsds.timeid",
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FT_UINT8, BASE_DEC, NULL, 0xC0,
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"time identifier", HFILL }
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},
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{ &hf_ccsds_checkword,
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{ "checkword indicator", "ccsds.checkword",
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FT_UINT8, BASE_DEC, NULL, 0x20,
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"checkword indicator", HFILL }
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},
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{ &hf_ccsds_zoe,
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{ "ZOE TLM", "ccsds.zoe",
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FT_UINT8, BASE_DEC, NULL, 0x10,
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"CONTAINS S-BAND ZOE PACKETS", HFILL }
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},
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{ &hf_ccsds_packtype,
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{ "packet type", "ccsds.packtype",
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FT_UINT8, BASE_DEC, NULL, 0x0f,
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"Packet Type - Unused in Ku-Band", HFILL }
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},
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{ &hf_ccsds_vid,
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{ "version identifier", "ccsds.vid",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"version identifier", HFILL }
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},
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{ &hf_ccsds_dcc,
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{ "Data Cycle Counter", "ccsds.dcc",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Data Cycle Counter", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_ccsds,
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&ett_header,
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&ett_header2,
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};
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/* Register the protocol name and description */
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proto_ccsds = proto_register_protocol("CCSDS", "CCSDS", "CCSDS");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_ccsds, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_ccsds(void)
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{
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dissector_handle_t ccsds_handle;
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ccsds_handle = create_dissector_handle(dissect_ccsds,
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proto_ccsds);
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dissector_add_handle("udp.port", ccsds_handle);
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}
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