diff options
Diffstat (limited to 'plugins/docsis/packet-dccrsp.c')
-rw-r--r-- | plugins/docsis/packet-dccrsp.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/plugins/docsis/packet-dccrsp.c b/plugins/docsis/packet-dccrsp.c new file mode 100644 index 0000000000..d0c15608be --- /dev/null +++ b/plugins/docsis/packet-dccrsp.c @@ -0,0 +1,277 @@ +/* packet-dccrsp.c + * Routines for DCC Response Message dissection + * Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + + +#include "moduleinfo.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <gmodule.h> + +#include <epan/packet.h> + +#define DCCRSP_CM_JUMP_TIME 1 +#define DCCRSP_KEY_SEQ_NUM 31 +#define DCCRSP_HMAC_DIGEST 27 + +/* Define DCC-RSP CM Jump Time subtypes + * These are subtype of DCCRSP_CM_JUMP_TIME (1) + */ +#define DCCRSP_CM_JUMP_TIME_LENGTH 1 +#define DCCRSP_CM_JUMP_TIME_START 2 + +/* Initialize the protocol and registered fields */ +static int proto_docsis_dccrsp = -1; + +static int hf_docsis_dccrsp_tran_id = -1; +static int hf_docsis_dccrsp_conf_code = -1; +static int hf_docsis_dccrsp_cm_jump_time_length = -1; +static int hf_docsis_dccrsp_cm_jump_time_start = -1; +static int hf_docsis_dccrsp_key_seq_num = -1; +static int hf_docsis_dccrsp_hmac_digest = -1; + +/* Initialize the subtree pointers */ +static gint ett_docsis_dccrsp = -1; +static gint ett_docsis_dccrsp_cm_jump_time = -1; + + +/* Code to actually dissect the packets */ +static void +dissect_dccrsp_cm_jump_time (tvbuff_t * tvb, proto_tree * tree, int start, guint16 len) +{ + guint8 type, length; + proto_item *dcc_item; + proto_tree *dcc_tree; + int pos; + + pos = start; + dcc_item = proto_tree_add_text ( tree, tvb, start, len, "2 DCC-RSP CM Time Jump Encodings (Length = %u)", len); + dcc_tree = proto_item_add_subtree ( dcc_item , ett_docsis_dccrsp_cm_jump_time); + + while ( pos < ( start + len) ) + { + type = tvb_get_guint8 (tvb, pos++); + length = tvb_get_guint8 (tvb, pos++); + + switch (type) + { + case DCCRSP_CM_JUMP_TIME_LENGTH: + if (length == 4) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_length, tvb, + pos, length, FALSE); + } + else + { + THROW (ReportedBoundsError); + } + break; + case DCCRSP_CM_JUMP_TIME_START: + if (length == 8) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_start, tvb, + pos, length, FALSE); + } + else + { + THROW (ReportedBoundsError); + } + break; + } + pos = pos + length; + } +} +static void +dissect_dccrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) +{ + guint16 pos; + guint8 type, length; + proto_tree *dcc_tree; + proto_item *dcc_item; + guint16 len; + + len = tvb_length_remaining (tvb, 0); + + if (check_col (pinfo->cinfo, COL_INFO)) + { + col_clear (pinfo->cinfo, COL_INFO); + col_add_fstr (pinfo->cinfo, COL_INFO,"DCC-RSP Message: "); + } + + if (tree) + { + dcc_item = + proto_tree_add_protocol_format (tree, proto_docsis_dccrsp, tvb, 0, + tvb_length_remaining (tvb, 0), + "DCC-RSP Message"); + dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccrsp); + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_tran_id, tvb, 0, 2, FALSE); + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_conf_code, tvb, 2, 1, FALSE); + + pos = 3; + while (pos < len) + { + type = tvb_get_guint8 (tvb, pos++); + length = tvb_get_guint8 (tvb, pos++); + switch (type) + { + case DCCRSP_CM_JUMP_TIME: + dissect_dccrsp_cm_jump_time (tvb , dcc_tree , pos , length ); + break; + case DCCRSP_KEY_SEQ_NUM: + if (length == 1) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_key_seq_num, tvb, + pos, length, FALSE); + } + else + { + THROW (ReportedBoundsError); + } + break; + case DCCRSP_HMAC_DIGEST: + if (length == 20) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_hmac_digest, tvb, + pos, length, FALSE); + } + else + { + THROW (ReportedBoundsError); + } + break; + } /* switch(type) */ + pos = pos + length; + } /* while (pos < len) */ + } /* if (tree) */ + +} +/* Register the protocol with Ethereal */ + +/* this format is require because a script is used to build the C function + that calls all the protocol registration. +*/ + + +void +proto_register_docsis_dccrsp (void) +{ +/* Setup list of header fields See Section 1.6.1 for details*/ + static hf_register_info hf[] = { + {&hf_docsis_dccrsp_tran_id , + { + "Transaction ID ", + "docsis.dccrsp.tran_id", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Transaction ID ", + HFILL + } + }, + {&hf_docsis_dccrsp_conf_code , + { + "Confirmation Code ", + "docsis.dccrsp.conf_code", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Confirmation Code ", + HFILL + } + }, + {&hf_docsis_dccrsp_cm_jump_time_length , + { + "Jump Time Length ", + "docsis.dccrsp.cm_jump_time_length", + FT_UINT32, BASE_DEC, NULL, 0x0, + "Jump Time Length ", + HFILL + } + }, + {&hf_docsis_dccrsp_cm_jump_time_start , + { + "Jump Time Start ", + "docsis.dccrsp.cm_jump_time_start", + FT_UINT64, BASE_DEC, NULL, 0x0, + "Jump Time Start ", + HFILL + } + }, + {&hf_docsis_dccrsp_key_seq_num , + { + "Auth Key Sequence Number ", + "docsis.dccrsp.key_seq_num", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Auth Key Sequence Number ", + HFILL + } + }, + {&hf_docsis_dccrsp_hmac_digest , + { + "HMAC-DigestNumber ", + "docsis.dccrsp.hmac_digest", + FT_BYTES, BASE_DEC, NULL, 0x0, + "HMAC-DigestNumber ", + HFILL + } + }, + + }; + +/* Setup protocol subtree array */ + static gint *ett[] = { + &ett_docsis_dccrsp, + &ett_docsis_dccrsp_cm_jump_time, + }; + +/* Register the protocol name and description */ + proto_docsis_dccrsp = + proto_register_protocol ("DOCSIS Downstream Channel Change Response ", + "DOCSIS DCC-RSP", "docsis_dccrsp"); + +/* Required function calls to register the header fields and subtrees used */ + proto_register_field_array (proto_docsis_dccrsp, hf, array_length (hf)); + proto_register_subtree_array (ett, array_length (ett)); + + register_dissector ("docsis_dccrsp", dissect_dccrsp, proto_docsis_dccrsp); +} + + +/* If this dissector uses sub-dissector registration add a registration routine. + This format is required because a script is used to find these routines and + create the code that calls these routines. +*/ +void +proto_reg_handoff_docsis_dccrsp (void) +{ + dissector_handle_t docsis_dccrsp_handle; + + docsis_dccrsp_handle = find_dissector ("docsis_dccrsp"); + dissector_add ("docsis_mgmt", 0x18, docsis_dccrsp_handle); + +} |