2000-04-15 22:11:26 +00:00
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/* packet-esis.c
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* Routines for ISO/OSI End System to Intermediate System
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* Routeing Exchange Protocol ISO 9542.
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*
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2000-05-31 05:09:07 +00:00
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* $Id: packet-esis.c,v 1.4 2000/05/31 05:07:02 guy Exp $
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2000-04-15 22:11:26 +00:00
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* Ralf Schneider <Ralf.Schneider@t-online.de>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "nlpid.h"
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#include "packet-osi.h"
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#include "packet-osi-options.h"
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#include "packet-esis.h"
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/* esis base header */
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static int proto_esis = -1;
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static int hf_esis_nlpi = -1;
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static int hf_esis_length = -1;
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static int hf_esis_version = -1;
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static int hf_esis_reserved = -1;
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static int hf_esis_type = -1;
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static int hf_esis_holdtime = -1;
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static int hf_esis_checksum = -1;
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static gint ett_esis = -1;
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static gint ett_esis_area_addr = -1;
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static const value_string esis_vals[] = {
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{ ESIS_ESH_PDU, "ES HELLO"},
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{ ESIS_ISH_PDU, "IS HELLO"},
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{ ESIS_RD_PDU, "RD REQUEST"},
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{ 0, NULL} };
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/* internal prototypes */
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void esis_dissect_esh_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *treepd);
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void esis_dissect_ish_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *tree);
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void esis_dissect_redirect_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *tree);
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/* ################## Descriptions ###########################################*/
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/* Parameters for the ESH PDU
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* Source Address Parameter:
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*
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* Octet: Length: Parameter Type:
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* 10 1 Number of Source Adresses ( NSAPs served by this Network
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* 11 1 Source Address Length Indicator ( SAL ) # Entity )
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* 12-m-1 variable Source Address ( NSAP )
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* m Options, dissected in osi.c
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*
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*
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* Parameter for the ISH PDU:
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* Network Entity Title Parameter:
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*
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* Octet: Length: Parameter Type:
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* 10 1 Network Entity Title Length Indicator ( NETL )
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* 11-m-1 variable Network Entity Title ( NET )
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* m Options, dissected in osi.c
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*
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*
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* Parameter for the RD PDU:
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* When re-directed to an IS:
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*
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* Octet: Length: Parameter Type:
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* 10 1 Destination Address Length Indicator ( DAL )
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* 11>m-1 variable Destination Address ( DA )
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* m 1 Subnetwork Address Length Indicator ( BSNPAL )
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* m+1>n-1 variable Subnetwork Address ( BSNPA )
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* n 1 Network Entity Title Length Indicator ( NETL )
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* n+1>p-1 variable Network Entity Title ( NET )
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* p Options, dissected in osi.c
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*
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*
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* Parameter for the RD PDU:
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* When re-directed to an ES:
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*
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* Octet: Length: Parameter Type:
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* 10 1 Destination Address Length Indicator ( DAL )
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* 11>m-1 variable Destination Address ( DA )
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* m 1 Subnetwork Address Length Indicator ( BSNPAL )
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* m+1>n-1 variable Subnetwork Address ( BSNPA )
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* n 1 Network Entity Title Length Indicator ( NETL ) == 0
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* n+1 Options, dissected in osi.c
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*
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*/
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/* ############################ Tool Functions ############################## */
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/* ############################## Dissection Functions ###################### */
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/*
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* Name: dissect_esis_unknown()
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*
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* Description:
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* There was some error in the protocol and we are in unknown space
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* here. Add a tree item to cover the error and go on. Note
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* that we make sure we don't go off the end of the bleedin packet here!
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*
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* This is just a copy of isis.c and isis.h, so I keep the stuff also
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* and adapt the names to cover possible protocol errors! Ive really no
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* idea wether I need this or not.
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*
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* Input
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* int offset : Current offset into packet data.
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* int len : length of to dump.
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* proto_tree * : tree of display data. May be NULL.
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* frame_data * fd : frame data
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* char * : format text
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*
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* Output:
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* void (may modify proto tree)
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*/
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void
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esis_dissect_unknown(int offset,guint length,proto_tree *tree,frame_data *fd,
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char *fmat, ...){
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va_list ap;
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if ( !IS_DATA_IN_FRAME(offset) ) {
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/*
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* big oops They were off the end of the packet already.
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* Just ignore this one.
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*/
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return;
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}
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if ( !BYTES_ARE_IN_FRAME(offset, length) ) {
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/*
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* length will take us past eop. Truncate length.
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*/
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length = END_OF_FRAME;
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}
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va_start(ap, fmat);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(tree, NullTVB, offset, length, fmat, ap);
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2000-04-15 22:11:26 +00:00
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va_end(ap);
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}
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void
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esis_dissect_esh_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *tree) {
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proto_tree *esis_area_tree;
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int no_sa = 0;
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int sal = 0;
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proto_item *ti;
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if (tree) {
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offset += ESIS_HDR_FIXED_LENGTH;
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no_sa = pd[offset];
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len -= 1;
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2000-05-11 08:18:09 +00:00
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ti = proto_tree_add_text( tree, NullTVB, offset++, END_OF_FRAME,
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2000-04-15 22:11:26 +00:00
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"Number of Source Addresses (SA, Format: NSAP) : %u", no_sa );
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esis_area_tree = proto_item_add_subtree( ti, ett_esis_area_addr );
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while ( no_sa-- > 0 ) {
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sal = (int) pd[offset++];
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(esis_area_tree, NullTVB, offset, 1, "SAL: %2u Octets", sal);
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proto_tree_add_text(esis_area_tree, NullTVB, offset + 1, sal,
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2000-04-15 22:11:26 +00:00
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" SA: %s", print_nsap_net( &pd[offset], sal ) );
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offset += sal;
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len -= ( sal + 1 );
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}
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dissect_osi_options( PDU_TYPE_ESIS_ESH, len, pd, offset, fd, tree );
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}
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} /* esis_dissect_esh_pdu */ ;
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void
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esis_dissect_ish_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *tree) {
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int netl = 0;
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if (tree) {
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offset += ESIS_HDR_FIXED_LENGTH;
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netl = (int) pd[ offset ];
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset, netl + 1,
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2000-04-15 22:11:26 +00:00
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"### Network Entity Titel Section ###");
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset++, 1, "NETL: %2u Octets", netl);
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proto_tree_add_text( tree, NullTVB, offset, netl,
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2000-04-15 22:11:26 +00:00
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" NET: %s", print_nsap_net( &pd[offset], netl ) );
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offset += netl;
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len -= ( netl + 1 );
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dissect_osi_options( PDU_TYPE_ESIS_ISH, len, pd, offset, fd, tree );
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}
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};
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void
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esis_dissect_redirect_pdu( u_char len, const u_char *pd, int offset,
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frame_data *fd, proto_tree *tree) {
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int tmpl = 0;
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if (tree) {
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offset += ESIS_HDR_FIXED_LENGTH;
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tmpl = (int) pd[ offset ];
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset, tmpl + 1,
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2000-04-15 22:11:26 +00:00
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"### Destination Address Section ###" );
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset++, 1, "DAL: %2u Octets", tmpl);
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proto_tree_add_text( tree, NullTVB, offset, tmpl,
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2000-04-15 22:11:26 +00:00
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" DA : %s", print_nsap_net( &pd[offset], tmpl ) );
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offset += tmpl;
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len -= ( tmpl + 1 );
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tmpl = (int) pd[ offset ];
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset, tmpl + 1,
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2000-04-15 22:11:26 +00:00
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"### Subnetwork Address Section ###");
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset++, 1, "BSNPAL: %2u Octets", tmpl);
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proto_tree_add_text( tree, NullTVB, offset, tmpl,
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2000-04-15 22:11:26 +00:00
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" BSNPA: %s", print_system_id( &pd[offset], tmpl ) );
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offset += tmpl;
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len -= ( tmpl + 1 );
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tmpl = (int) pd[ offset ];
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if ( 0 == tmpl ) {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset, 1,
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2000-04-15 22:11:26 +00:00
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"### No Network Entity Title Section ###" );
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offset++;
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len--;
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}
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else {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset, 1,
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2000-04-15 22:11:26 +00:00
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"### Network Entity Title Section ###" );
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text( tree, NullTVB, offset++, 1, "NETL: %2u Octets", tmpl );
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proto_tree_add_text( tree, NullTVB, offset, tmpl,
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2000-04-15 22:11:26 +00:00
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" NET: %s", print_nsap_net( &pd[offset], tmpl ) );
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offset += tmpl;
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len -= ( tmpl + 1 );
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}
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dissect_osi_options( PDU_TYPE_ESIS_RD, len, pd, offset, fd, tree );
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}
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}
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/*
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* Name: dissect_esis()
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*
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* Description:
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* Main entry area for esis de-mangling. This will build the
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* main esis tree data and call the sub-protocols as needed.
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet where we are (packet_data[offset]== start
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* of what we care about)
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* frame_data * : frame data (whole packet with extra info)
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* proto_tree * : tree of display data. May be NULL.
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*
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* Output:
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* void, but we will add to the proto_tree if it is not NULL.
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*/
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2000-04-17 01:36:31 +00:00
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static void
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2000-04-15 22:11:26 +00:00
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dissect_esis(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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char *pdu_type_string = NULL;
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char *pdu_type_format_string = "PDU Type : %s (R:%s%s%s)";
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esis_hdr_t *ehdr;
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proto_item *ti;
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proto_tree *esis_tree = NULL;
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int variable_len = 0;
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u_int tmp_uint = 0;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "ESIS");
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if (!BYTES_ARE_IN_FRAME(offset, sizeof(*ehdr))) {
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esis_dissect_unknown(offset, sizeof(*ehdr), tree, fd,
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"Not enough capture data for header (%d vs %d)",
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sizeof(*ehdr), END_OF_FRAME);
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return;
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}
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ehdr = (esis_hdr_t *) &pd[offset];
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if (ehdr->esis_version != ESIS_REQUIRED_VERSION){
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esis_dissect_unknown(offset, END_OF_FRAME, tree, fd,
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"Unknown ESIS version (%d vs %d)",
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ehdr->esis_version, ESIS_REQUIRED_VERSION );
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return;
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}
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if (tree) {
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2000-05-31 05:09:07 +00:00
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ti = proto_tree_add_item(tree, proto_esis, NullTVB, offset, END_OF_FRAME, FALSE);
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2000-04-15 22:11:26 +00:00
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esis_tree = proto_item_add_subtree(ti, ett_esis);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint( esis_tree, hf_esis_nlpi, NullTVB, offset, 1, ehdr->esis_nlpi );
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proto_tree_add_uint( esis_tree, hf_esis_length, NullTVB,
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2000-04-15 22:11:26 +00:00
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offset + 1, 1, ehdr->esis_length );
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint( esis_tree, hf_esis_version, NullTVB, offset + 2, 1,
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2000-04-15 22:11:26 +00:00
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ehdr->esis_version );
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint( esis_tree, hf_esis_reserved, NullTVB, offset + 3, 1,
|
2000-04-15 22:11:26 +00:00
|
|
|
ehdr->esis_reserved );
|
|
|
|
|
|
|
|
pdu_type_string = val_to_str(ehdr->esis_type&OSI_PDU_TYPE_MASK,
|
|
|
|
esis_vals, "Unknown (0x%x)");
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
proto_tree_add_uint_format( esis_tree, hf_esis_type, NullTVB, offset + 4, 1,
|
2000-04-15 22:11:26 +00:00
|
|
|
ehdr->esis_type,
|
|
|
|
pdu_type_format_string,
|
|
|
|
pdu_type_string,
|
|
|
|
(ehdr->esis_type&BIT_8) ? "1" : "0",
|
|
|
|
(ehdr->esis_type&BIT_7) ? "1" : "0",
|
|
|
|
(ehdr->esis_type&BIT_6) ? "1" : "0");
|
|
|
|
|
|
|
|
tmp_uint = pntohs( ehdr->esis_holdtime );
|
2000-05-11 08:18:09 +00:00
|
|
|
proto_tree_add_uint_format(esis_tree, hf_esis_holdtime, NullTVB, offset + 5, 2,
|
2000-04-15 22:11:26 +00:00
|
|
|
tmp_uint, "Holding Time : %u seconds",
|
|
|
|
tmp_uint );
|
|
|
|
|
|
|
|
tmp_uint = pntohs( ehdr->esis_checksum );
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
proto_tree_add_uint_format( esis_tree, hf_esis_checksum, NullTVB, offset + 7, 2,
|
2000-04-15 22:11:26 +00:00
|
|
|
tmp_uint, "Checksum : 0x%x ( %s )",
|
|
|
|
tmp_uint, calc_checksum( &pd[offset],
|
|
|
|
ehdr->esis_length ,
|
|
|
|
tmp_uint ) );
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Let us make sure we use the same names for all our decodes
|
|
|
|
* here. First, dump the name into info column, and THEN
|
|
|
|
* dispatch the sub-type.
|
|
|
|
*/
|
|
|
|
if (check_col(fd, COL_INFO)) {
|
|
|
|
col_add_str(fd, COL_INFO,
|
|
|
|
val_to_str( ehdr->esis_type&OSI_PDU_TYPE_MASK, esis_vals,
|
|
|
|
"Unknown (0x%x)" ) );
|
|
|
|
}
|
|
|
|
|
|
|
|
variable_len = ehdr->esis_length - ESIS_HDR_FIXED_LENGTH;
|
|
|
|
|
|
|
|
switch (ehdr->esis_type) {
|
|
|
|
case ESIS_ESH_PDU:
|
|
|
|
esis_dissect_esh_pdu( variable_len, pd, offset, fd, esis_tree);
|
|
|
|
break;
|
|
|
|
case ESIS_ISH_PDU:
|
|
|
|
esis_dissect_ish_pdu( variable_len, pd, offset, fd, esis_tree);
|
|
|
|
break;
|
|
|
|
case ESIS_RD_PDU:
|
|
|
|
esis_dissect_redirect_pdu( variable_len, pd, offset, fd,
|
|
|
|
esis_tree);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
esis_dissect_unknown(offset, END_OF_FRAME, tree, fd,
|
|
|
|
"unknown esis packet type" );
|
|
|
|
}
|
|
|
|
} /* dissect_esis */
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Name: proto_register_esisesis()
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* main register for esis protocol set. We register some display
|
|
|
|
* formats and the protocol module variables.
|
|
|
|
*
|
|
|
|
* NOTE: this procedure to autolinked by the makefile process that
|
|
|
|
* builds register.c
|
|
|
|
*
|
|
|
|
* Input:
|
|
|
|
* void
|
|
|
|
*
|
|
|
|
* Output:
|
|
|
|
* void
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
proto_register_esis(void) {
|
|
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_esis_nlpi,
|
|
|
|
{ "Network Layer Protocol Identifier", "esis.nlpi",
|
|
|
|
FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, "" }},
|
|
|
|
{ &hf_esis_length,
|
|
|
|
{ "PDU Length ", "esis.length", FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_esis_version,
|
|
|
|
{ "Version (==1) ", "esis.ver", FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_esis_reserved,
|
|
|
|
{ "Reserved(==0) ", "esis.res", FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_esis_type,
|
|
|
|
{ "PDU Type ", "esis.type", FT_UINT8, BASE_DEC, VALS(esis_vals),
|
|
|
|
0xff, "" }},
|
|
|
|
{ &hf_esis_holdtime,
|
|
|
|
{ "Holding Time ", "esis.htime", FT_UINT16, BASE_DEC, NULL, 0x0, " s"}},
|
|
|
|
{ &hf_esis_checksum,
|
|
|
|
{ "Checksum ", "esis.chksum", FT_UINT16, BASE_HEX, NULL, 0x0, "" }}
|
|
|
|
};
|
|
|
|
/*
|
|
|
|
*
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_esis,
|
|
|
|
&ett_esis_area_addr,
|
|
|
|
};
|
|
|
|
|
|
|
|
proto_esis = proto_register_protocol( PROTO_STRING_ESIS, "esis");
|
|
|
|
proto_register_field_array(proto_esis, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
};
|
2000-04-17 01:36:31 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_esis(void)
|
|
|
|
{
|
|
|
|
dissector_add("osinl", NLPID_ISO9542_ESIS, dissect_esis);
|
|
|
|
}
|