forked from osmocom/wireshark
269 lines
7.9 KiB
C
269 lines
7.9 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 1.30 2000/04/15 22:11:12 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@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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* To do:
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*
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* - add other network protocols (IS-IS)
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* - add NSAP decoding & resolution
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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 <ctype.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-h1.h"
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#include "nlpid.h"
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#include "packet-osi.h"
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#include "packet-clnp.h"
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#include "packet-isis.h"
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#include "packet-esis.h"
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gchar *print_system_id( const u_char *buffer, int length ) {
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int tmp;
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u_char *cur;
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static gchar str[MAX_SYSTEMID_LEN * 3 + 5]; /* Don't trust exact matching */
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if ( ( length <= 0 ) || ( length > MAX_SYSTEMID_LEN ) ) {
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sprintf( str, "<Invalid length of SYSTEM ID>");
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return( str );
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}
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cur = str;
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if ( ( 6 == length ) || ( 7 == length ) ) { /* Special case, print as MAC */
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cur += sprintf(str, "[%02x:%02x:%02x_%02x:%02x:%02x]", buffer[0], buffer[1],
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buffer[2], buffer[3], buffer[4], buffer[5] );
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if ( 7 == length ) {
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sprintf( cur, "-%02x", buffer[6] );
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}
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}
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else {
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tmp = 0;
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while ( tmp < length / 4 ) { /* 16 / 4 == 4 > four Octets left to print */
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cur += sprintf( str, "%02x%02x%02x%02x.", buffer[tmp++], buffer[tmp++],
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buffer[tmp++], buffer[tmp++] );
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}
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if ( 1 == tmp ) { /* Special case for Designated IS */
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sprintf( --cur, "-%02x", buffer[tmp] );
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}
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else {
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for ( ; tmp < length; ) { /* print the rest without dot */
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cur += sprintf( cur, "%02x", buffer[tmp++] );
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}
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}
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}
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return( str );
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}
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gchar *print_area(const u_char *buffer, int length)
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{
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/* to do : all real area decoding now: NET is assumed if id len is 1 more byte
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* and take away all these stupid resource consuming local statics
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*/
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static gchar str[MAX_AREA_LEN * 3 + 20]; /* reserve space for nice layout */
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gchar *cur;
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u_int tmp = 0;
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cur = str;
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if (length <= 0 || length > MAX_AREA_LEN) {
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sprintf( str, "<Invalid length of AREA>");
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return( str );
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}
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if ( ( ( NSAP_IDI_ISODCC == *buffer )
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|| ( NSAP_IDI_GOSIP2 == *buffer )
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)
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&&
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( ( RFC1237_FULLAREA_LEN == length )
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|| ( RFC1237_FULLAREA_LEN + 1 == length )
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)
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) { /* AFI is good and length is long enough */
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if ( length > RFC1237_FULLAREA_LEN + 1 ) { /* Special Case Designated IS */
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sprintf( str, "<Invalid length of AREA for DCC / GOSIP AFI>");
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return( str );
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}
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cur += sprintf( cur, "[%02x|%02x:%02x][%02x|%02x:%02x:%02x|%02x:%02x]",
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buffer[0], buffer[1], buffer[2], buffer[3], buffer[4],
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buffer[5], buffer[6], buffer[7], buffer[8] );
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cur += sprintf( cur, "[%02x:%02x|%02x:%02x]",
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buffer[9], buffer[10], buffer[11], buffer[12] );
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if ( RFC1237_FULLAREA_LEN + 1 == length ) {
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sprintf( cur, "-[%02x]", buffer[20] );
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}
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return str;
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}
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else { /* print standard format */
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if ( 4 < length ) {
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while ( tmp < length / 4 ) { /* 16/4==4 four Octets left to print */
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cur += sprintf( str, "%02x%02x%02x%02x.", buffer[tmp++], buffer[tmp++],
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buffer[tmp++], buffer[tmp++] );
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}
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if ( 1 == tmp ) { /* Special case for Designated IS */
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sprintf( --cur, "-%02x", buffer[tmp] );
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}
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else {
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for ( ; tmp < length; ) { /* print the rest without dot */
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cur += sprintf( cur, "%02x", buffer[tmp++] );
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}
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}
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}
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return( str );
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}
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} /* print_area */
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gchar *print_nsap_net( const u_char *buffer, int length)
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{
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/* to do : NSAP / NET decoding */
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static gchar str[MAX_NSAP_LEN * 3 + 50]; /* reserve space for nice layout */
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gchar *cur;
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cur = str;
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if ( (length <= 0 ) || ( length > MAX_NSAP_LEN ) ) {
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sprintf( str, "<Invalid length of NSAP>");
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return( str );
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}
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if ( ( length == RFC1237_NSAP_LEN ) || ( length == RFC1237_NSAP_LEN + 1 ) ) {
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cur += sprintf( cur, "%s", print_area( buffer, RFC1237_FULLAREA_LEN ) );
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cur += sprintf( cur, "%s", print_system_id( buffer + RFC1237_FULLAREA_LEN,
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RFC1237_SYSTEMID_LEN ) );
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cur += sprintf( cur, "[%02x]",
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buffer[ RFC1237_FULLAREA_LEN + RFC1237_SYSTEMID_LEN ] );
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if ( length == RFC1237_NSAP_LEN + 1 ) {
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cur += sprintf( cur, "-%02x", buffer[ length -1 ] );
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}
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return ( str );
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}
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else { /* probably format as standard */
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return( print_area( buffer, length ) );
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}
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} /* print_nsap */
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gchar *calc_checksum( const u_char *buffer, u_int len, u_int checksum) {
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u_int calc_sum = 0;
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u_int count = 0;
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static char *checksum_string[] = { "Not Used",
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"Is good",
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"Is wrong" };
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if ( 0 == checksum )
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return( checksum_string[0] );
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for ( count = 0; count < len; count++ ) {
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calc_sum += (u_int) buffer[count];
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}
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calc_sum %= 255; /* modulo 255 divison */
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if ( 0 == calc_sum )
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return( checksum_string[1] );
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else
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return( checksum_string[2] );
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}
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/* main entry point */
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const value_string nlpid_vals[] = {
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{ NLPID_NULL, "NULL" },
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{ NLPID_T_70, "T.70" },
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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_IP, "IP" },
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{ NLPID_PPP, "PPP" },
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{ 0, NULL },
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};
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void dissect_osi(const u_char *pd, int offset, frame_data *fd,
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proto_tree *tree)
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{
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switch (pd[offset]) {
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/* ESIS (X.25) is not currently decoded */
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case NLPID_ISO8473_CLNP:
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case NLPID_NULL: /* "Inactive Subset" of ISO 8473 CLNP */
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dissect_clnp(pd, offset, fd, tree);
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break;
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case NLPID_ISO9542_ESIS:
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dissect_esis(pd, offset, fd, tree);
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break;
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case NLPID_ISO9542X25_ESIS:
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if (check_col(fd, COL_PROTOCOL)) {
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col_add_str(fd, COL_PROTOCOL, "ESIS (X.25)");
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}
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dissect_data(pd, offset, fd, tree);
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break;
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case NLPID_ISO10589_ISIS:
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dissect_isis(pd, offset, fd, tree);
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break;
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case NLPID_ISO10747_IDRP:
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if (check_col(fd, COL_PROTOCOL)) {
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col_add_str(fd, COL_PROTOCOL, "IDRP");
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}
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dissect_data(pd, offset, fd, tree);
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break;
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default:
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if (check_col(fd, COL_PROTOCOL)) {
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col_add_str(fd, COL_PROTOCOL, "ISO");
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}
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "Unknown ISO protocol (%02x)", pd[offset]);
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}
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dissect_data(pd, offset, fd, tree);
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break;
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}
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} /* dissect_osi */
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