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wireshark/epan/osi-utils.c

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/* osi-utils.c
* Routines for ISO/OSI network and transport protocol packet disassembly
* Main entrance point and common functions
*
* Laurent Deniel <laurent.deniel@free.fr>
* Ralf Schneider <Ralf.Schneider@t-online.de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "tvbuff.h"
#include "osi-utils.h"
#include "address.h"
#include "address_types.h"
/*
* XXX - shouldn't there be a centralized routine for dissecting NSAPs?
* See also "dissect_atm_nsap()" in epan/dissectors/packet-arp.c and
* "dissect_nsap()" in epan/dissectors/packet-isup.c.
*/
gchar *
print_nsap_net( tvbuff_t *tvb, const gint offset, int length )
{
gchar *cur;
cur = (gchar *)wmem_alloc(wmem_packet_scope(), MAX_NSAP_LEN * 3 + 50);
print_nsap_net_buf( tvb_get_ptr(tvb, offset, length), length, cur, MAX_NSAP_LEN * 3 + 50);
return( cur );
}
/* XXX - Should these be converted to string buffers? */
void
print_nsap_net_buf( const guint8 *ad, int length, gchar *buf, int buf_len)
{
gchar *cur;
/* to do : NSAP / NET decoding */
if ( (length <= 0 ) || ( length > MAX_NSAP_LEN ) ) {
g_strlcpy(buf, "<Invalid length of NSAP>", buf_len);
return;
}
cur = buf;
if ( ( length == RFC1237_NSAP_LEN ) || ( length == RFC1237_NSAP_LEN + 1 ) ) {
print_area_buf(ad, RFC1237_FULLAREA_LEN, cur, buf_len);
cur += strlen( cur );
print_system_id_buf( ad + RFC1237_FULLAREA_LEN, RFC1237_SYSTEMID_LEN, cur, (int) (buf_len-(cur-buf)));
cur += strlen( cur );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x]",
ad[ RFC1237_FULLAREA_LEN + RFC1237_SYSTEMID_LEN ] );
if ( length == RFC1237_NSAP_LEN + 1 ) {
g_snprintf(cur, (int) (buf_len-(cur-buf)), "-%02x", ad[ length -1 ] );
}
}
else { /* probably format as standard */
print_area_buf( ad, length, buf, buf_len);
}
} /* print_nsap */
gchar *
print_system_id(wmem_allocator_t* scope, const guint8 *ad, int length )
{
gchar *cur;
cur = (gchar *)wmem_alloc(scope, MAX_SYSTEMID_LEN * 3 + 5);
print_system_id_buf(ad, length, cur, MAX_SYSTEMID_LEN * 3 + 5);
return( cur );
}
gchar *
tvb_print_system_id( tvbuff_t *tvb, const gint offset, int length )
{
return( print_system_id(wmem_packet_scope(), tvb_get_ptr(tvb, offset, length), length) );
}
void
print_system_id_buf( const guint8 *ad, int length, gchar *buf, int buf_len)
{
gchar *cur;
int tmp;
if ( ( length <= 0 ) || ( length > MAX_SYSTEMID_LEN ) ) {
g_strlcpy(buf, "<Invalid length of SYSTEM ID>", buf_len);
return;
}
cur = buf;
if ( ( 6 == length ) || /* System-ID */
( 7 == length ) || /* LAN-ID */
( 8 == length )) { /* LSP-ID */
cur += g_snprintf(cur, buf_len, "%02x%02x.%02x%02x.%02x%02x", ad[0], ad[1],
ad[2], ad[3], ad[4], ad[5] );
if ( ( 7 == length ) ||
( 8 == length )) {
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), ".%02x", ad[6] );
}
if ( 8 == length ) {
g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-%02x", ad[7] );
}
}
else {
tmp = 0;
while ( tmp < length / 4 ) { /* 16 / 4 == 4 > four Octets left to print */
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x.", ad[tmp++] );
}
if ( 1 == tmp ) { /* Special case for Designated IS */
cur--;
g_snprintf(cur, (gulong) (buf_len-(cur-buf)), ".%02x", ad[tmp] );
}
else {
for ( ; tmp < length; ) { /* print the rest without dot */
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
}
}
}
}
gchar *
print_area(tvbuff_t *tvb, const gint offset, int length)
{
gchar *cur;
cur = (gchar *)wmem_alloc(wmem_packet_scope(), MAX_AREA_LEN * 3 + 20);
print_area_buf(tvb_get_ptr(tvb, offset, length), length, cur, MAX_AREA_LEN * 3 + 20);
return cur;
}
void
print_area_buf(const guint8 *ad, int length, gchar *buf, int buf_len)
{
gchar *cur;
int tmp = 0;
/* to do : all real area decoding now: NET is assumed if id len is 1 more byte
* and take away all these stupid resource consuming local statics
*/
if (length <= 0 || length > MAX_AREA_LEN) {
g_strlcpy(buf, "<Invalid length of AREA>", buf_len);
return;
}
cur = buf;
if ( ( ( NSAP_IDI_ISODCC == *ad )
|| ( NSAP_IDI_GOSIP2 == *ad )
)
&&
( ( RFC1237_FULLAREA_LEN == length )
|| ( RFC1237_FULLAREA_LEN + 1 == length )
)
) { /* AFI is good and length is long enough */
/* there used to be a check for (length > RFC1237_FULLAREA_LEN + 1) here,
* in order to report an invalied length of AREA for DCC / GOSIP AFI,
* but that can *never* be the case because the if() test above explicitly
* tests for (length == RFC1237_FULLAREA_LEN) or (length == RFC1237_FULLAREA_LEN + 1)
*/
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x|%02x:%02x][%02x|%02x:%02x:%02x|%02x:%02x]",
ad[0], ad[1], ad[2], ad[3], ad[4],
ad[5], ad[6], ad[7], ad[8] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "[%02x:%02x|%02x:%02x]",
ad[9], ad[10], ad[11], ad[12] );
if ( RFC1237_FULLAREA_LEN + 1 == length )
g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-[%02x]", ad[20] );
}
else { /* print standard format */
if ( length == RFC1237_AREA_LEN ) {
g_snprintf(buf, buf_len, "%02x.%02x%02x", ad[0], ad[1], ad[2] );
return;
}
if ( length == 4 ) {
g_snprintf(buf, buf_len, "%02x%02x%02x%02x", ad[0], ad[1], ad[2], ad[3] );
return;
}
while ( tmp < length / 4 ) { /* 16/4==4 > four Octets left to print */
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x.", ad[tmp++] );
}
if ( 1 == tmp ) { /* Special case for Designated IS */
cur--;
g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "-%02x", ad[tmp] );
}
else {
for ( ; tmp < length; ) { /* print the rest without dot or dash */
cur += g_snprintf(cur, (gulong) (buf_len-(cur-buf)), "%02x", ad[tmp++] );
}
}
}
} /* print_area_buf */
/******************************************************************************
* OSI Address Type
******************************************************************************/
static int osi_address_type = -1;
static int osi_address_to_str(const address* addr, gchar *buf, int buf_len)
{
print_nsap_net_buf((const guint8 *)addr->data, addr->len, buf, buf_len);
return (int)strlen(buf)+1;
}
static int osi_address_str_len(const address* addr _U_)
{
return MAX_NSAP_LEN * 3 + 50;
}
int get_osi_address_type(void)
{
return osi_address_type;
}
void register_osi_address_type(void)
{
if (osi_address_type != -1)
return;
osi_address_type = address_type_dissector_register("AT_OSI", "OSI Address", osi_address_to_str, osi_address_str_len, NULL, NULL, NULL, NULL);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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