/* packet-rdm.c * Routines for RDM packet disassembly * * $Id$ * * Copyright (c) 2003 by Erwin Rol * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1999 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. */ /* Include files */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "moduleinfo.h" #include #include #include #include #include #include #include #include #include "etypes.h" #include /* Define version if we are not building ethereal statically */ #ifndef ENABLE_STATIC G_MODULE_EXPORT const gchar version[] = VERSION; #endif /* * See http://www.esta.org/tsp/E1-20inst.htm * */ void proto_reg_handoff_rdm(void); /* Define the rdm proto */ static int proto_rdm = -1; /* Header */ static int hf_rdm_sub_start_code = -1; static int hf_rdm_slot_count = -1; static int hf_rdm_dest_uid = -1; static int hf_rdm_src_uid = -1; static int hf_rdm_seq_nr = -1; static int hf_rdm_res_type = -1; static int hf_rdm_msg_count = -1; static int hf_rdm_sub_device = -1; static int hf_rdm_mdb = -1; static int hf_rdm_checksum = -1; /* Define the tree for rdm */ static int ett_rdm = -1; static void dissect_rdm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { gint offset = 0, start_offset,i; guint16 checksum,calc_checksum; gint mdb_size; proto_tree *ti=NULL,*rdm_tree=NULL; proto_item* item; /* Set the protocol column */ if(check_col(pinfo->cinfo,COL_PROTOCOL)){ col_set_str(pinfo->cinfo,COL_PROTOCOL,"RDM"); } /* Clear out stuff in the info column */ if(check_col(pinfo->cinfo,COL_INFO)){ col_clear(pinfo->cinfo,COL_INFO); } if (tree) { ti = proto_tree_add_item(tree, proto_rdm, tvb, offset, -1, FALSE); rdm_tree = proto_item_add_subtree(ti, ett_rdm); } if (check_col(pinfo->cinfo, COL_INFO)) { col_append_fstr(pinfo->cinfo, COL_INFO, "%s", "RDM"); } if (tree) { start_offset = offset; proto_tree_add_item(rdm_tree, hf_rdm_sub_start_code, tvb, offset, 1, FALSE); offset += 1; mdb_size = tvb_get_guint8(tvb, offset) - 19; if (mdb_size < 20) { proto_tree_add_text(rdm_tree, tvb, offset, 1, "Invalid MDB size: %d", mdb_size + 19); return; } proto_tree_add_item(rdm_tree, hf_rdm_slot_count, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(rdm_tree, hf_rdm_dest_uid, tvb, offset, 6, FALSE); offset += 6; proto_tree_add_item(rdm_tree, hf_rdm_src_uid, tvb, offset, 6, FALSE); offset += 6; proto_tree_add_item(rdm_tree, hf_rdm_seq_nr, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(rdm_tree, hf_rdm_res_type, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(rdm_tree, hf_rdm_msg_count, tvb, offset, 1, FALSE); offset += 1; proto_tree_add_item(rdm_tree, hf_rdm_sub_device, tvb, offset, 1, FALSE); offset += 1; tvb_ensure_bytes_exist(tvb, offset, mdb_size); proto_tree_add_item(rdm_tree, hf_rdm_mdb, tvb, offset, mdb_size, FALSE); offset += mdb_size; calc_checksum = 0x00f0; for( i = start_offset; i < offset; i++) { calc_checksum += tvb_get_guint8( tvb, i ); } checksum = tvb_get_ntohs( tvb, offset ); item = proto_tree_add_item(rdm_tree, hf_rdm_checksum, tvb, offset, 2, FALSE); if( calc_checksum != checksum ) proto_item_append_text( item, " ( INCORRECT should be 0x%04x )", calc_checksum ); else proto_item_append_text( item, " ( CORRECT )" ); offset += 2; } } void proto_register_rdm(void) { static hf_register_info hf[] = { { &hf_rdm_sub_start_code, { "Sub Start Code", "rdm.sub_start_code", FT_UINT8, BASE_HEX, NULL, 0x0, "Sub Start Code", HFILL }}, { &hf_rdm_slot_count, { "Slot Count", "rdm.slot_count", FT_UINT8, BASE_DEC, NULL, 0x0, "Slot Count", HFILL }}, { &hf_rdm_dest_uid, { "Dest. UID", "rdm.dest_uid", FT_BYTES, BASE_HEX, NULL, 0x0, "Dest. UID", HFILL }}, { &hf_rdm_src_uid, { "Source UID", "rdm.src_uid", FT_BYTES, BASE_HEX, NULL, 0x0, "Source UID", HFILL }}, { &hf_rdm_seq_nr, { "Sequence Number", "rdm.seq_nr", FT_UINT8, BASE_DEC, NULL, 0x0, "Sequence Number", HFILL }}, { &hf_rdm_res_type, { "Response Type", "rdm.res_type", FT_UINT8, BASE_HEX, NULL, 0x0, "Response Type", HFILL }}, { &hf_rdm_msg_count, { "Message Count", "rdm.msg_count", FT_UINT8, BASE_DEC, NULL, 0x0, "Message Count", HFILL }}, { &hf_rdm_sub_device, { "Sub Device", "rdm.sub_device", FT_UINT8, BASE_HEX, NULL, 0x0, "Sub Device", HFILL }}, { &hf_rdm_mdb, { "MDB", "rdm.mdb", FT_BYTES, BASE_HEX, NULL, 0x0, "MDB", HFILL }}, { &hf_rdm_checksum, { "Checksum", "rdm.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, "Checksum", HFILL }} }; static gint *ett[] = { &ett_rdm, }; proto_rdm = proto_register_protocol("RDM","RDM","rdm"); proto_register_field_array(proto_rdm,hf,array_length(hf)); proto_register_subtree_array(ett,array_length(ett)); register_dissector("rdm", dissect_rdm, proto_rdm); } /* The registration hand-off routing */ void proto_reg_handoff_rdm(void) { static int rdm_initialized = FALSE; static dissector_handle_t rdm_handle; if(!rdm_initialized) { rdm_handle = create_dissector_handle(dissect_rdm,proto_rdm); rdm_initialized = TRUE; } else { dissector_delete("udp.port",0,rdm_handle); } dissector_add("udp.port",0,rdm_handle); } /* Start the functions we need for the plugin stuff */ #ifndef ENABLE_STATIC G_MODULE_EXPORT void plugin_register(void) { /* register the new protocol, protocol fields, and subtrees */ if (proto_rdm == -1) { /* execute protocol initialization only once */ proto_register_rdm(); } } G_MODULE_EXPORT void plugin_reg_handoff(void){ proto_reg_handoff_rdm(); } #endif /* End the functions we need for plugin stuff */