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/*XXX
There is a bug in asn2eth that it can not yet handle tagged assignments such
as EXTERNAL ::= [UNIVERSAL 8] IMPLICIT SEQUENCE {
This bug is workedaround by some .cnf magic but this should be cleaned up
once asn2eth learns how to deal with tagged assignments
*/
/* packet-acse.c
* Routines for ACSE packet dissection
* Ronnie Sahlberg 2005
* dissect_acse() based original handwritten dissector by Sid
* Yuriy Sidelnikov <YSidelnikov@hotmail.com>
*
*
* $Id$
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include <epan/conversation.h>
#include <stdio.h>
#include <string.h>
#include "packet-ber.h"
#include "packet-acse.h"
#include "packet-ses.h"
#include "packet-pres.h"
#include "packet-x509if.h"
#define PNAME "ISO 8650-1 OSI Association Control Service"
#define PSNAME "ACSE"
#define PFNAME "acse"
#define ACSE_APDU_OID "2.2.1.0.1"
/* Initialize the protocol and registered fields */
int proto_acse = -1;
#include "packet-acse-hf.c"
/* Initialize the subtree pointers */
static gint ett_acse = -1;
#include "packet-acse-ett.c"
static struct SESSION_DATA_STRUCTURE* session = NULL;
static const char *object_identifier_id;
/* indirect_reference, used to pick up the signalling so we know what
kind of data is transferred in SES_DATA_TRANSFER_PDUs */
static guint32 indir_ref=0;
static proto_tree *top_tree=NULL;
#if NOT_NEEDED
/* to keep track of presentation context identifiers and protocol-oids */
typedef struct _acse_ctx_oid_t {
/* XXX here we should keep track of ADDRESS/PORT as well */
guint32 ctx_id;
char *oid;
} acse_ctx_oid_t;
static GHashTable *acse_ctx_oid_table = NULL;
static guint
acse_ctx_oid_hash(gconstpointer k)
{
acse_ctx_oid_t *aco=(acse_ctx_oid_t *)k;
return aco->ctx_id;
}
/* XXX this one should be made ADDRESS/PORT aware */
static gint
acse_ctx_oid_equal(gconstpointer k1, gconstpointer k2)
{
acse_ctx_oid_t *aco1=(acse_ctx_oid_t *)k1;
acse_ctx_oid_t *aco2=(acse_ctx_oid_t *)k2;
return aco1->ctx_id==aco2->ctx_id;
}
static void
acse_init(void)
{
if( acse_ctx_oid_table ){
g_hash_table_destroy(acse_ctx_oid_table);
acse_ctx_oid_table = NULL;
}
acse_ctx_oid_table = g_hash_table_new(acse_ctx_oid_hash,
acse_ctx_oid_equal);
}
static void
register_ctx_id_and_oid(packet_info *pinfo _U_, guint32 idx, char *oid)
{
acse_ctx_oid_t *aco, *tmpaco;
aco=se_alloc(sizeof(acse_ctx_oid_t));
aco->ctx_id=idx;
aco->oid=se_strdup(oid);
/* if this ctx already exists, remove the old one first */
tmpaco=(acse_ctx_oid_t *)g_hash_table_lookup(acse_ctx_oid_table, aco);
if(tmpaco){
g_hash_table_remove(acse_ctx_oid_table, tmpaco);
}
g_hash_table_insert(acse_ctx_oid_table, aco, aco);
}
static char *
find_oid_by_ctx_id(packet_info *pinfo _U_, guint32 idx)
{
acse_ctx_oid_t aco, *tmpaco;
aco.ctx_id=idx;
tmpaco=(acse_ctx_oid_t *)g_hash_table_lookup(acse_ctx_oid_table, &aco);
if(tmpaco){
return tmpaco->oid;
}
return NULL;
}
# endif /* NOT_NEEDED */
#include "packet-acse-fn.c"
/*
* Dissect ACSE PDUs inside a PPDU.
*/
static void
dissect_acse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
int offset = 0;
proto_item *item=NULL;
proto_tree *tree=NULL;
char *oid;
/* first, try to check length */
/* do we have at least 2 bytes */
if (!tvb_bytes_exist(tvb, 0, 2)){
proto_tree_add_text(parent_tree, tvb, offset,
tvb_reported_length_remaining(tvb,offset),
"User data");
return; /* no, it isn't a ACSE PDU */
}
/* do we have spdu type from the session dissector? */
if( !pinfo->private_data ){
if(parent_tree){
REPORT_DISSECTOR_BUG("Can't get SPDU type from session dissector.");
}
return ;
} else {
session = ( (struct SESSION_DATA_STRUCTURE*)(pinfo->private_data) );
if(session->spdu_type == 0 ) {
if(parent_tree){
REPORT_DISSECTOR_BUG(
ep_strdup_printf("Wrong spdu type %x from session dissector.",session->spdu_type));
return ;
}
}
}
/* save parent_tree so subdissectors can create new top nodes */
top_tree=parent_tree;
/* ACSE has only AARQ,AARE,RLRQ,RLRE,ABRT type of pdu */
/* reject everything else */
/* data pdu is not ACSE pdu and has to go directly to app dissector */
switch(session->spdu_type){
case SES_CONNECTION_REQUEST: /* AARQ */
case SES_CONNECTION_ACCEPT: /* AARE */
case SES_REFUSE: /* RLRE */
case SES_DISCONNECT: /* RLRQ */
case SES_FINISH: /* RLRE */
case SES_ABORT: /* ABRT */
break;
case SES_DATA_TRANSFER:
oid=find_oid_by_pres_ctx_id(pinfo, indir_ref);
if(oid){
if(strcmp(oid, ACSE_APDU_OID) == 0){
proto_tree_add_text(parent_tree, tvb, offset, -1,
"Invalid OID: %s", ACSE_APDU_OID);
THROW(ReportedBoundsError);
}
call_ber_oid_callback(oid, tvb, offset, pinfo, parent_tree);
} else {
proto_tree_add_text(parent_tree, tvb, offset, -1,
"dissector is not available");
}
top_tree = NULL;
return;
default:
top_tree = NULL;
return;
}
/* create display subtree for the protocol */
if(parent_tree){
item = proto_tree_add_item(parent_tree, proto_acse, tvb, 0, -1, FALSE);
tree = proto_item_add_subtree(item, ett_acse);
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACSE");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
/* we can't make any additional checking here */
/* postpone it before dissector will have more information */
while (tvb_reported_length_remaining(tvb, offset) > 0){
int old_offset=offset;
offset = dissect_acse_ACSE_apdu(FALSE, tvb, offset, pinfo, tree, -1);
if(offset == old_offset ){
proto_tree_add_text(tree, tvb, offset, -1,"Malformed packet");
offset = tvb_length(tvb);
break;
}
}
top_tree = NULL;
}
/*--- proto_register_acse ----------------------------------------------*/
void proto_register_acse(void) {
/* List of fields */
static hf_register_info hf[] = {
#include "packet-acse-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_acse,
#include "packet-acse-ettarr.c"
};
/* Register protocol */
proto_acse = proto_register_protocol(PNAME, PSNAME, PFNAME);
register_dissector("acse", dissect_acse, proto_acse);
/* Register fields and subtrees */
proto_register_field_array(proto_acse, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/*--- proto_reg_handoff_acse -------------------------------------------*/
void proto_reg_handoff_acse(void) {
/*#include "packet-acse-dis-tab.c"*/
register_ber_oid_name("2.2.3.1.1","aCSE-id");
register_ber_oid_dissector(ACSE_APDU_OID, dissect_acse, proto_acse, "acse-as-id");
}
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