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/* packet-osi.c
* Routines for ISO/OSI network and transport protocol packet disassembly
* Main entrance point and common functions
*
* $Id: packet-osi.c,v 1.43 2001/04/08 19:32:03 guy Exp $
* Laurent Deniel <deniel@worldnet.fr>
* Ralf Schneider <Ralf.Schneider@t-online.de>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <glib.h>
#include "packet.h"
#include "llcsaps.h"
#include "aftypes.h"
#include "nlpid.h"
#include "ppptypes.h"
#include "packet-osi.h"
#include "packet-isis.h"
#include "packet-esis.h"
gchar *calc_checksum( tvbuff_t *tvb, int offset, u_int len, u_int checksum) {
u_int calc_sum = 0;
u_int count = 0;
const gchar *buffer;
guint available_len;
if ( 0 == checksum )
return( "Not Used" );
available_len = tvb_length_remaining( tvb, offset );
if ( available_len < len )
return( "Not checkable - not all of packet was captured" );
buffer = tvb_get_ptr( tvb, offset, len );
for ( count = 0; count < len; count++ ) {
calc_sum += (u_int) buffer[count];
}
calc_sum %= 255; /* modulo 255 divison */
if ( 0 == calc_sum )
return( "Is good" );
else
return( "Is wrong" ); /* XXX - what should the checksum be? */
}
/* main entry point */
const value_string nlpid_vals[] = {
{ NLPID_NULL, "NULL" },
{ NLPID_T_70, "T.70" },
{ NLPID_X_633, "X.633" },
{ NLPID_Q_931, "Q.931" },
{ NLPID_Q_2931, "Q.2931" },
{ NLPID_Q_2119, "Q.2119" },
{ NLPID_SNAP, "SNAP" },
{ NLPID_ISO8473_CLNP, "CLNP" },
{ NLPID_ISO9542_ESIS, "ESIS" },
{ NLPID_ISO10589_ISIS, "ISIS" },
{ NLPID_ISO10747_IDRP, "IDRP" },
{ NLPID_ISO9542X25_ESIS, "ESIS (X.25)" },
{ NLPID_ISO10030, "ISO 10030" },
{ NLPID_ISO11577, "ISO 11577" },
{ NLPID_COMPRESSED, "Data compression protocol" },
{ NLPID_IP, "IP" },
{ NLPID_PPP, "PPP" },
{ 0, NULL },
};
dissector_table_t osinl_subdissector_table;
static void dissect_osi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 nlpid;
pinfo->current_proto = "OSI";
nlpid = tvb_get_guint8(tvb, 0);
/* do lookup with the subdissector table */
if (dissector_try_port(osinl_subdissector_table, nlpid, tvb, pinfo, tree))
return;
switch (nlpid) {
/* ESIS (X.25) is not currently decoded */
case NLPID_ISO9542X25_ESIS:
if (check_col(pinfo->fd, COL_PROTOCOL)) {
col_set_str(pinfo->fd, COL_PROTOCOL, "ESIS (X.25)");
}
dissect_data(tvb, 0, pinfo, tree);
break;
case NLPID_ISO10747_IDRP:
if (check_col(pinfo->fd, COL_PROTOCOL)) {
col_set_str(pinfo->fd, COL_PROTOCOL, "IDRP");
}
dissect_data(tvb, 0, pinfo, tree);
break;
default:
if (check_col(pinfo->fd, COL_PROTOCOL)) {
col_set_str(pinfo->fd, COL_PROTOCOL, "ISO");
}
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Unknown ISO protocol (%02x)", nlpid);
}
dissect_data(tvb, 0, pinfo, tree);
break;
}
} /* dissect_osi */
void
proto_register_osi(void)
{
/* There's no "OSI" protocol *per se*, but we do register a
dissector table so various protocols running at the
network layer can register themselves. */
osinl_subdissector_table = register_dissector_table("osinl");
}
void
proto_reg_handoff_osi(void)
{
dissector_add("llc.dsap", SAP_OSINL, dissect_osi, -1);
dissector_add("ppp.protocol", PPP_OSI, dissect_osi, -1);
dissector_add("null.type", BSD_AF_ISO, dissect_osi, -1);
}
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