214 lines
7.0 KiB
C
214 lines
7.0 KiB
C
/* osi-utils.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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* $Id$
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* Laurent Deniel <laurent.deniel@free.fr>
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* Ralf Schneider <Ralf.Schneider@t-online.de>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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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 "osi-utils.h"
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#include "emem.h"
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/*
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* XXX - shouldn't there be a centralized routine for dissecting NSAPs?
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* See also "dissect_atm_nsap()" in epan/dissectors/packet-arp.c and
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* "dissect_nsap()" in epan/dissectors/packet-isup.c.
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*/
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gchar *
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print_nsap_net( const guint8 *ad, int length )
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{
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gchar *cur;
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cur = ep_alloc(MAX_NSAP_LEN * 3 + 50);
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print_nsap_net_buf( ad, length, cur, MAX_NSAP_LEN * 3 + 50);
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return( cur );
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}
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/* XXX - Should these be converted to string buffers? */
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void
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print_nsap_net_buf( const guint8 *ad, int length, gchar *buf, int buf_len)
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{
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gchar *cur;
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/* to do : NSAP / NET decoding */
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if ( (length <= 0 ) || ( length > MAX_NSAP_LEN ) ) {
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g_snprintf(buf, buf_len, "<Invalid length of NSAP>");
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return;
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}
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cur = buf;
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if ( ( length == RFC1237_NSAP_LEN ) || ( length == RFC1237_NSAP_LEN + 1 ) ) {
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print_area_buf(ad, RFC1237_FULLAREA_LEN, cur, buf_len);
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cur += strlen( cur );
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print_system_id_buf( ad + RFC1237_FULLAREA_LEN, RFC1237_SYSTEMID_LEN, cur, (int) (buf_len-(cur-buf)));
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cur += strlen( cur );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x]",
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ad[ RFC1237_FULLAREA_LEN + RFC1237_SYSTEMID_LEN ] );
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if ( length == RFC1237_NSAP_LEN + 1 ) {
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g_snprintf(cur, (int) (buf_len-(cur-buf)), "-%02x", ad[ length -1 ] );
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}
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}
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else { /* probably format as standard */
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print_area_buf( ad, length, buf, buf_len);
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}
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} /* print_nsap */
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gchar *
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print_system_id( const guint8 *ad, int length )
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{
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gchar *cur;
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cur = ep_alloc(MAX_SYSTEMID_LEN * 3 + 5);
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print_system_id_buf(ad, length, cur, MAX_SYSTEMID_LEN * 3 + 5);
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return( cur );
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}
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void
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print_system_id_buf( const guint8 *ad, int length, gchar *buf, int buf_len)
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{
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gchar *cur;
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int tmp;
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if ( ( length <= 0 ) || ( length > MAX_SYSTEMID_LEN ) ) {
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g_snprintf(buf, buf_len, "<Invalid length of SYSTEM ID>");
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return;
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}
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cur = buf;
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if ( ( 6 == length ) || /* System-ID */
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( 7 == length ) || /* LAN-ID */
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( 8 == length )) { /* LSP-ID */
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cur += g_snprintf(cur, buf_len, "%02x%02x.%02x%02x.%02x%02x", ad[0], ad[1],
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ad[2], ad[3], ad[4], ad[5] );
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if ( ( 7 == length ) ||
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( 8 == length )) {
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), ".%02x", ad[6] );
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}
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if ( 8 == length ) {
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g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-%02x", ad[7] );
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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 += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x.", ad[tmp++] );
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}
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if ( 1 == tmp ) { /* Special case for Designated IS */
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cur--;
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g_snprintf(cur, (gulong) (buf_len-(cur-buf)), ".%02x", ad[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 += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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}
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}
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}
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}
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gchar *
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print_area(const guint8 *ad, int length)
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{
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gchar *cur;
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cur = ep_alloc(MAX_AREA_LEN * 3 + 20);
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print_area_buf(ad, length, cur, MAX_AREA_LEN * 3 + 20);
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return cur;
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}
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void
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print_area_buf(const guint8 *ad, int length, gchar *buf, int buf_len)
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{
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gchar *cur;
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int tmp = 0;
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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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if (length <= 0 || length > MAX_AREA_LEN) {
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g_snprintf(buf, buf_len, "<Invalid length of AREA>");
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return;
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}
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cur = buf;
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if ( ( ( NSAP_IDI_ISODCC == *ad )
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|| ( NSAP_IDI_GOSIP2 == *ad )
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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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/* there used to be a check for (length > RFC1237_FULLAREA_LEN + 1) here,
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* in order to report an invalied length of AREA for DCC / GOSIP AFI,
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* but that can *never* be the case because the if() test above explicitly
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* tests for (length == RFC1237_FULLAREA_LEN) or (length == RFC1237_FULLAREA_LEN + 1)
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*/
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x|%02x:%02x][%02x|%02x:%02x:%02x|%02x:%02x]",
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ad[0], ad[1], ad[2], ad[3], ad[4],
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ad[5], ad[6], ad[7], ad[8] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x:%02x|%02x:%02x]",
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ad[9], ad[10], ad[11], ad[12] );
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if ( RFC1237_FULLAREA_LEN + 1 == length )
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g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-[%02x]", ad[20] );
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}
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else { /* print standard format */
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if ( length == RFC1237_AREA_LEN ) {
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g_snprintf(buf, buf_len, "%02x.%02x%02x", ad[0], ad[1], ad[2] );
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return;
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}
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if(length == 4)
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{
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g_snprintf(buf, buf_len, "%02x%02x%02x%02x", ad[0], ad[1], ad[2], ad[3] );
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}
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if ( 4 < length )
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{
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while ( tmp < length / 4 ) { /* 16/4==4 > four Octets left to print */
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x.", ad[tmp++] );
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}
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if ( 1 == tmp ) { /* Special case for Designated IS */
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cur--;
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g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-%02x", ad[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 += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
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}
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}
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}
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}
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} /* print_area_buf */
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