diff options
Diffstat (limited to 'plugins/docsis/packet-dccack.c')
| -rw-r--r-- | plugins/docsis/packet-dccack.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/plugins/docsis/packet-dccack.c b/plugins/docsis/packet-dccack.c new file mode 100644 index 0000000000..ad16ce0fde --- /dev/null +++ b/plugins/docsis/packet-dccack.c @@ -0,0 +1,189 @@ +/* packet-dccack.c + * Routines for DCC Acknowledge 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 DCCACK_KEY_SEQ_NUM 31 +#define DCCACK_HMAC_DIGEST 27 + +/* Initialize the protocol and registered fields */ +static int proto_docsis_dccack = -1; + +static int hf_docsis_dccack_tran_id = -1; +static int hf_docsis_dccack_key_seq_num = -1; +static int hf_docsis_dccack_hmac_digest = -1; + +/* Initialize the subtree pointers */ +static gint ett_docsis_dccack = -1; + + +/* Code to actually dissect the packets */ +static void +dissect_dccack (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-ACK Message: "); + } + + if (tree) + { + dcc_item = + proto_tree_add_protocol_format (tree, proto_docsis_dccack, tvb, 0, + tvb_length_remaining (tvb, 0), + "DCC-ACK Message"); + dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccack); + proto_tree_add_item (dcc_tree, hf_docsis_dccack_tran_id, tvb, 0, 2, FALSE); + + pos = 2; + while (pos < len) + { + type = tvb_get_guint8 (tvb, pos++); + length = tvb_get_guint8 (tvb, pos++); + switch (type) + { + case DCCACK_KEY_SEQ_NUM: + if (length == 1) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccack_key_seq_num, tvb, + pos, length, FALSE); + } + else + { + THROW (ReportedBoundsError); + } + break; + case DCCACK_HMAC_DIGEST: + if (length == 20) + { + proto_tree_add_item (dcc_tree, hf_docsis_dccack_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_dccack (void) +{ +/* Setup list of header fields See Section 1.6.1 for details*/ + static hf_register_info hf[] = { + {&hf_docsis_dccack_tran_id , + { + "Transaction ID ", + "docsis.dccack.tran_id", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Transaction ID ", + HFILL + } + }, + {&hf_docsis_dccack_key_seq_num , + { + "Auth Key Sequence Number ", + "docsis.dccack.key_seq_num", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Auth Key Sequence Number ", + HFILL + } + }, + {&hf_docsis_dccack_hmac_digest , + { + "HMAC-DigestNumber ", + "docsis.dccack.hmac_digest", + FT_BYTES, BASE_DEC, NULL, 0x0, + "HMAC-DigestNumber ", + HFILL + } + }, + + }; + +/* Setup protocol subtree array */ + static gint *ett[] = { + &ett_docsis_dccack, + }; + +/* Register the protocol name and description */ + proto_docsis_dccack = + proto_register_protocol ("DOCSIS Downstream Channel Change Acknowledge ", + "DOCSIS DCC-ACK", "docsis_dccack"); + +/* Required function calls to register the header fields and subtrees used */ + proto_register_field_array (proto_docsis_dccack, hf, array_length (hf)); + proto_register_subtree_array (ett, array_length (ett)); + + register_dissector ("docsis_dccack", dissect_dccack, proto_docsis_dccack); +} + + +/* 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_dccack (void) +{ + dissector_handle_t docsis_dccack_handle; + + docsis_dccack_handle = find_dissector ("docsis_dccack"); + dissector_add ("docsis_mgmt", 0x19, docsis_dccack_handle); + +} |