/* packet-dccrsp.c * Routines for DCC Response Message dissection * Copyright 2004, Darryl Hymel * * $Id$ * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #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, ENC_BIG_ENDIAN); } 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, ENC_BIG_ENDIAN); } 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); col_set_str(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, ENC_BIG_ENDIAN); proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_conf_code, tvb, 2, 1, ENC_BIG_ENDIAN); 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, ENC_BIG_ENDIAN); } 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, ENC_NA); } else { THROW (ReportedBoundsError); } break; } /* switch(type) */ pos = pos + length; } /* while (pos < len) */ } /* if (tree) */ } /* Register the protocol with Wireshark */ /* 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, NULL, HFILL } }, {&hf_docsis_dccrsp_conf_code , { "Confirmation Code", "docsis_dccrsp.conf_code", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, {&hf_docsis_dccrsp_cm_jump_time_length , { "Jump Time Length", "docsis_dccrsp.cm_jump_time_length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, {&hf_docsis_dccrsp_cm_jump_time_start , { "Jump Time Start", "docsis_dccrsp.cm_jump_time_start", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, {&hf_docsis_dccrsp_key_seq_num , { "Auth Key Sequence Number", "docsis_dccrsp.key_seq_num", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, {&hf_docsis_dccrsp_hmac_digest , { "HMAC-DigestNumber", "docsis_dccrsp.hmac_digest", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, 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_uint ("docsis_mgmt", 0x18, docsis_dccrsp_handle); }