265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/* packet-dccrsp.c
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* Routines for DCC Response Message dissection
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* Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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void proto_register_docsis_dccrsp(void);
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void proto_reg_handoff_docsis_dccrsp(void);
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#define DCCRSP_CM_JUMP_TIME 1
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#define DCCRSP_KEY_SEQ_NUM 31
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#define DCCRSP_HMAC_DIGEST 27
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/* Define DCC-RSP CM Jump Time subtypes
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* These are subtype of DCCRSP_CM_JUMP_TIME (1)
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*/
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#define DCCRSP_CM_JUMP_TIME_LENGTH 1
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#define DCCRSP_CM_JUMP_TIME_START 2
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/* Initialize the protocol and registered fields */
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static int proto_docsis_dccrsp = -1;
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static int hf_docsis_dccrsp_tran_id = -1;
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static int hf_docsis_dccrsp_conf_code = -1;
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static int hf_docsis_dccrsp_cm_jump_time_length = -1;
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static int hf_docsis_dccrsp_cm_jump_time_start = -1;
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static int hf_docsis_dccrsp_key_seq_num = -1;
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static int hf_docsis_dccrsp_hmac_digest = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_dccrsp = -1;
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static gint ett_docsis_dccrsp_cm_jump_time = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_dccrsp_cm_jump_time (tvbuff_t * tvb, proto_tree * tree, int start, guint16 len)
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{
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guint8 type, length;
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proto_item *dcc_item;
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proto_tree *dcc_tree;
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int pos;
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pos = start;
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dcc_item = proto_tree_add_text ( tree, tvb, start, len, "2 DCC-RSP CM Time Jump Encodings (Length = %u)", len);
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dcc_tree = proto_item_add_subtree ( dcc_item , ett_docsis_dccrsp_cm_jump_time);
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while ( pos < ( start + len) )
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case DCCRSP_CM_JUMP_TIME_LENGTH:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_length, tvb,
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pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case DCCRSP_CM_JUMP_TIME_START:
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if (length == 8)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_start, tvb,
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pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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}
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pos = pos + length;
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}
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}
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static void
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dissect_dccrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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guint16 pos;
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guint8 type, length;
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proto_tree *dcc_tree;
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proto_item *dcc_item;
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guint16 len;
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len = tvb_length_remaining (tvb, 0);
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col_set_str(pinfo->cinfo, COL_INFO, "DCC-RSP Message: ");
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if (tree)
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{
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dcc_item =
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proto_tree_add_protocol_format (tree, proto_docsis_dccrsp, tvb, 0,
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tvb_length_remaining (tvb, 0),
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"DCC-RSP Message");
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dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccrsp);
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_tran_id, tvb, 0, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_conf_code, tvb, 2, 1, ENC_BIG_ENDIAN);
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pos = 3;
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while (pos < len)
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case DCCRSP_CM_JUMP_TIME:
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dissect_dccrsp_cm_jump_time (tvb , dcc_tree , pos , length );
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break;
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case DCCRSP_KEY_SEQ_NUM:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_key_seq_num, tvb,
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pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case DCCRSP_HMAC_DIGEST:
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if (length == 20)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_hmac_digest, tvb,
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pos, length, ENC_NA);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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} /* switch(type) */
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pos = pos + length;
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} /* while (pos < len) */
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} /* if (tree) */
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}
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/* Register the protocol with Wireshark */
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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_docsis_dccrsp (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_docsis_dccrsp_tran_id ,
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{
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"Transaction ID",
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"docsis_dccrsp.tran_id",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_conf_code ,
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{
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"Confirmation Code",
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"docsis_dccrsp.conf_code",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_cm_jump_time_length ,
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{
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"Jump Time Length",
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"docsis_dccrsp.cm_jump_time_length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_cm_jump_time_start ,
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{
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"Jump Time Start",
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"docsis_dccrsp.cm_jump_time_start",
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FT_UINT64, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_key_seq_num ,
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{
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"Auth Key Sequence Number",
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"docsis_dccrsp.key_seq_num",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_hmac_digest ,
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{
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"HMAC-DigestNumber",
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"docsis_dccrsp.hmac_digest",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL,
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HFILL
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}
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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_docsis_dccrsp,
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&ett_docsis_dccrsp_cm_jump_time,
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};
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/* Register the protocol name and description */
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proto_docsis_dccrsp =
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proto_register_protocol ("DOCSIS Downstream Channel Change Response",
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"DOCSIS DCC-RSP", "docsis_dccrsp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array (proto_docsis_dccrsp, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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register_dissector ("docsis_dccrsp", dissect_dccrsp, proto_docsis_dccrsp);
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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_docsis_dccrsp (void)
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{
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dissector_handle_t docsis_dccrsp_handle;
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docsis_dccrsp_handle = find_dissector ("docsis_dccrsp");
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dissector_add_uint ("docsis_mgmt", 0x18, docsis_dccrsp_handle);
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}
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