![Guy Harris](/assets/img/avatar_default.png)
"epan/..." pathnames, so as to avoid collisions with header files in any of the directories in which we look (e.g., "proto.h", as some other package has its own "proto.h" file which it installs in the top-level include directory). Don't add "-I" flags to search "epan", as that's no longer necessary (and we want includes of "epan" headers to fail if the "epan/" is left out, so that we don't re-introduce includes lacking "epan/"). svn path=/trunk/; revision=4586
200 lines
5.6 KiB
C
200 lines
5.6 KiB
C
/* packet-osi.c
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* Routines for ISO/OSI network and transport protocol packet disassembly
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* Main entrance point and common functions
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*
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* $Id: packet-osi.c,v 1.53 2002/01/21 07:36:38 guy Exp $
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* Laurent Deniel <deniel@worldnet.fr>
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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@ethereal.com>
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* Copyright 1998 Gerald Combs
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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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#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 <ctype.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "llcsaps.h"
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#include "aftypes.h"
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#include "nlpid.h"
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#include "ppptypes.h"
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#include "packet-osi.h"
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#include "packet-isis.h"
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#include "packet-esis.h"
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cksum_status_t
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calc_checksum( tvbuff_t *tvb, int offset, u_int len, u_int checksum) {
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const gchar *buffer;
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guint available_len;
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const guint8 *p;
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guint32 c0, c1;
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u_int seglen;
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u_int i;
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if ( 0 == checksum )
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return( NO_CKSUM );
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available_len = tvb_length_remaining( tvb, offset );
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if ( available_len < len )
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return( DATA_MISSING );
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buffer = tvb_get_ptr( tvb, offset, len );
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/*
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* The maximum values of c0 and c1 will occur if all bytes have the
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* value 255; if so, then c0 will be len*255 and c1 will be
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* (len*255 + (len-1)*255 + ... + 255), which is
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* (len + (len - 1) + ... + 1)*255, or 255*(len*(len + 1))/2.
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* This means it can overflow if "len" is 5804 or greater.
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*
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* (A+B) mod 255 = ((A mod 255) + (B mod 255) mod 255, so
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* we can solve this by taking c0 and c1 mod 255 every
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* 5803 bytes.
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*/
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p = buffer;
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c0 = 0;
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c1 = 0;
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while (len != 0) {
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seglen = len;
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if (seglen > 5803)
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seglen = 5803;
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for (i = 0; i < seglen; i++) {
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c0 = c0 + *(p++);
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c1 += c0;
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}
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c0 = c0 % 255;
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c1 = c1 % 255;
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len -= seglen;
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}
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if (c0 != 0 || c1 != 0)
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return( CKSUM_NOT_OK ); /* XXX - what should the checksum be? */
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else
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return( CKSUM_OK );
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}
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/* main entry point */
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/*
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* These assume the NLPID is a secondary protocol identifier, not an
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* initial protocol identifier.
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*
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* This is an issue only if, in any packet where an NLPID appears, it's
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* an initial protocol identifier *AND* it can have the value 1, which
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* means T.70 for an IPI and X.29 for an SPI.
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*/
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const value_string nlpid_vals[] = {
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{ NLPID_NULL, "NULL" },
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{ NLPID_SPI_X_29, "X.29" },
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{ NLPID_X_633, "X.633" },
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{ NLPID_Q_931, "Q.931" },
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{ NLPID_Q_2931, "Q.2931" },
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{ NLPID_Q_2119, "Q.2119" },
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{ NLPID_SNAP, "SNAP" },
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{ NLPID_ISO8473_CLNP, "CLNP" },
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{ NLPID_ISO9542_ESIS, "ESIS" },
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{ NLPID_ISO10589_ISIS, "ISIS" },
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{ NLPID_ISO10747_IDRP, "IDRP" },
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{ NLPID_ISO9542X25_ESIS, "ESIS (X.25)" },
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{ NLPID_ISO10030, "ISO 10030" },
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{ NLPID_ISO11577, "ISO 11577" },
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{ NLPID_COMPRESSED, "Data compression protocol" },
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{ NLPID_IP, "IP" },
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{ NLPID_IP6, "IPv6" },
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{ NLPID_PPP, "PPP" },
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{ 0, NULL },
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};
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dissector_table_t osinl_subdissector_table;
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static dissector_handle_t data_handle;
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static void dissect_osi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 nlpid;
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pinfo->current_proto = "OSI";
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nlpid = tvb_get_guint8(tvb, 0);
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/* do lookup with the subdissector table */
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if (dissector_try_port(osinl_subdissector_table, nlpid, tvb, pinfo, tree))
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return;
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switch (nlpid) {
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/* ESIS (X.25) is not currently decoded */
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case NLPID_ISO9542X25_ESIS:
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ESIS (X.25)");
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}
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call_dissector(data_handle,tvb, pinfo, tree);
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break;
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case NLPID_ISO10747_IDRP:
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "IDRP");
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}
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call_dissector(data_handle,tvb, pinfo, tree);
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break;
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default:
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISO");
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown ISO protocol (%02x)", nlpid);
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}
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call_dissector(data_handle,tvb, pinfo, tree);
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break;
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}
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} /* dissect_osi */
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void
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proto_register_osi(void)
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{
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/* There's no "OSI" protocol *per se*, but we do register a
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dissector table so various protocols running at the
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network layer can register themselves. */
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osinl_subdissector_table = register_dissector_table("osinl",
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"OSI NLPID", FT_UINT8, BASE_HEX);
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}
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void
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proto_reg_handoff_osi(void)
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{
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dissector_handle_t osi_handle;
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osi_handle = create_dissector_handle(dissect_osi, -1);
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dissector_add("llc.dsap", SAP_OSINL, osi_handle);
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dissector_add("ppp.protocol", PPP_OSI, osi_handle);
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dissector_add("null.type", BSD_AF_ISO, osi_handle);
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dissector_add("gre.proto", SAP_OSINL, osi_handle);
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data_handle = find_dissector("data");
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}
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