/* packet-rtse_asn1.c
* Routines for RTSE packet dissection
* Graeme Lunt 2005
*
* $Id: packet-rtse-template.c 23450 2007-11-14 20:57:55Z gal $
*
* 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/conversation.h>
#include <epan/prefs.h>
#include <epan/reassemble.h>
#include <epan/asn1.h>
#include <stdio.h>
#include <string.h>
#include "packet-ber.h"
#include "packet-pres.h"
#include "packet-acse.h"
#include "packet-ros.h"
#include "packet-rtse.h"
#define PNAME "X.228 OSI Reliable Transfer Service"
#define PSNAME "RTSE"
#define PFNAME "rtse"
/* Initialize the protocol and registered fields */
int proto_rtse = -1;
static struct SESSION_DATA_STRUCTURE* session = NULL;
static gboolean open_request=FALSE;
/* 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 guint32 app_proto=0;
static proto_tree *top_tree=NULL;
static dissector_handle_t rtse_handle = NULL;
static dissector_handle_t ros_handle = NULL;
/* Preferences */
static gboolean rtse_reassemble = TRUE;
#include "packet-rtse-hf.c"
/* Initialize the subtree pointers */
static gint ett_rtse = -1;
#include "packet-rtse-ett.c"
static dissector_table_t rtse_oid_dissector_table=NULL;
static GHashTable *oid_table=NULL;
static gint ett_rtse_unknown = -1;
static GHashTable *rtse_segment_table = NULL;
static GHashTable *rtse_reassembled_table = NULL;
static int hf_rtse_fragments = -1;
static int hf_rtse_fragment = -1;
static int hf_rtse_fragment_overlap = -1;
static int hf_rtse_fragment_overlap_conflicts = -1;
static int hf_rtse_fragment_multiple_tails = -1;
static int hf_rtse_fragment_too_long_fragment = -1;
static int hf_rtse_fragment_error = -1;
static int hf_rtse_reassembled_in = -1;
static gint ett_rtse_fragment = -1;
static gint ett_rtse_fragments = -1;
static const fragment_items rtse_frag_items = {
/* Fragment subtrees */
&ett_rtse_fragment,
&ett_rtse_fragments,
/* Fragment fields */
&hf_rtse_fragments,
&hf_rtse_fragment,
&hf_rtse_fragment_overlap,
&hf_rtse_fragment_overlap_conflicts,
&hf_rtse_fragment_multiple_tails,
&hf_rtse_fragment_too_long_fragment,
&hf_rtse_fragment_error,
/* Reassembled in field */
&hf_rtse_reassembled_in,
/* Tag */
"RTSE fragments"
};
void
register_rtse_oid_dissector_handle(const char *oid, dissector_handle_t dissector, int proto _U_, const char *name, gboolean uses_ros)
{
/* save the name - but not used */
g_hash_table_insert(oid_table, (gpointer)oid, (gpointer)name);
/* register RTSE with the BER (ACSE) */
register_ber_oid_dissector_handle(oid, rtse_handle, proto, name);
if(uses_ros) {
/* make sure we call ROS ... */
dissector_add_string("rtse.oid", oid, ros_handle);
/* and then tell ROS how to dissect the AS*/
register_ros_oid_dissector_handle(oid, dissector, proto, name, TRUE);
} else {
/* otherwise we just remember how to dissect the AS */
dissector_add_string("rtse.oid", oid, dissector);
}
}
static int
call_rtse_oid_callback(const char *oid, tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
tvbuff_t *next_tvb;
next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), tvb_reported_length_remaining(tvb, offset));
if(!dissector_try_string(rtse_oid_dissector_table, oid, next_tvb, pinfo, tree)){
proto_item *item=NULL;
proto_tree *next_tree=NULL;
item=proto_tree_add_text(tree, next_tvb, 0, tvb_length_remaining(tvb, offset), "RTSE: Dissector for OID:%s not implemented. Contact Wireshark developers if you want this supported", oid);
if(item){
next_tree=proto_item_add_subtree(item, ett_rtse_unknown);
}
dissect_unknown_ber(pinfo, next_tvb, offset, next_tree);
}
/*XXX until we change the #.REGISTER signature for _PDU()s
* into new_dissector_t we have to do this kludge with
* manually step past the content in the ANY type.
*/
offset+=tvb_length_remaining(tvb, offset);
return offset;
}
static int
call_rtse_external_type_callback(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_)
{
const char *oid = NULL;
if (actx->external.indirect_ref_present) {
oid = (const char *)find_oid_by_pres_ctx_id(actx->pinfo, actx->external.indirect_reference);
} else if (actx->external.direct_ref_present) {
oid = actx->external.direct_reference;
}
if (oid)
offset = call_rtse_oid_callback(oid, tvb, offset, actx->pinfo, top_tree ? top_tree : tree);
return offset;
}
#include "packet-rtse-fn.c"
/*
* Dissect RTSE PDUs inside a PPDU.
*/
static void
dissect_rtse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
int offset = 0;
int old_offset;
proto_item *item=NULL;
proto_tree *tree=NULL;
tvbuff_t *next_tvb = NULL;
tvbuff_t *data_tvb = NULL;
fragment_data *frag_msg = NULL;
guint32 fragment_length;
guint32 rtse_id = 0;
gboolean data_handled = FALSE;
conversation_t *conversation = NULL;
asn1_ctx_t asn1_ctx;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
/* save parent_tree so subdissectors can create new top nodes */
top_tree=parent_tree;
/* do we have application context from the acse dissector? */
if( !pinfo->private_data ){
if(parent_tree){
proto_tree_add_text(parent_tree, tvb, offset, -1,
"Internal error:can't get application context from ACSE dissector.");
}
return ;
} else {
session = ( (struct SESSION_DATA_STRUCTURE*)(pinfo->private_data) );
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTSE");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (rtse_reassemble &&
((session->spdu_type == SES_DATA_TRANSFER) ||
(session->spdu_type == SES_MAJOR_SYNC_POINT))) {
/* Use conversation index as fragment id */
conversation = find_conversation (pinfo->fd->num,
&pinfo->src, &pinfo->dst, pinfo->ptype,
pinfo->srcport, pinfo->destport, 0);
if (conversation != NULL) {
rtse_id = conversation->index;
}
session->rtse_reassemble = TRUE;
}
if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {
frag_msg = fragment_end_seq_next (pinfo, rtse_id, rtse_segment_table,
rtse_reassembled_table);
next_tvb = process_reassembled_data (tvb, offset, pinfo, "Reassembled RTSE",
frag_msg, &rtse_frag_items, NULL, parent_tree);
}
if(parent_tree){
item = proto_tree_add_item(parent_tree, proto_rtse, next_tvb ? next_tvb : tvb, 0, -1, FALSE);
tree = proto_item_add_subtree(item, ett_rtse);
}
if (rtse_reassemble && session->spdu_type == SES_DATA_TRANSFER) {
/* strip off the OCTET STRING encoding - including any CONSTRUCTED OCTET STRING */
dissect_ber_octet_string(FALSE, &asn1_ctx, NULL, tvb, offset, 0, &data_tvb);
if (data_tvb) {
fragment_length = tvb_length_remaining (data_tvb, 0);
proto_tree_add_text(tree, data_tvb, 0, (fragment_length) ? -1 : 0,
"RTSE segment data (%u byte%s)", fragment_length,
plurality(fragment_length, "", "s"));
frag_msg = fragment_add_seq_next (data_tvb, 0, pinfo,
rtse_id, rtse_segment_table,
rtse_reassembled_table, fragment_length, TRUE);
if (frag_msg && pinfo->fd->num != frag_msg->reassembled_in) {
/* Add a "Reassembled in" link if not reassembled in this frame */
proto_tree_add_uint (tree, *(rtse_frag_items.hf_reassembled_in),
data_tvb, 0, 0, frag_msg->reassembled_in);
}
pinfo->fragmented = TRUE;
data_handled = TRUE;
} else {
fragment_length = tvb_length_remaining (tvb, offset);
}
if (check_col(pinfo->cinfo, COL_INFO))
col_append_fstr(pinfo->cinfo, COL_INFO, "[RTSE fragment, %u byte%s]",
fragment_length, plurality(fragment_length, "", "s"));
} else if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {
if (next_tvb) {
/* ROS won't do this for us */
session->ros_op = (ROS_OP_INVOKE | ROS_OP_ARGUMENT);
offset=dissect_ber_external_type(FALSE, tree, next_tvb, 0, &asn1_ctx, -1, call_rtse_external_type_callback);
} else {
offset = tvb_length (tvb);
}
pinfo->fragmented = FALSE;
data_handled = TRUE;
}
if (!data_handled) {
while (tvb_reported_length_remaining(tvb, offset) > 0){
old_offset=offset;
offset=dissect_rtse_RTSE_apdus(TRUE, tvb, offset, &asn1_ctx, tree, -1);
if(offset == old_offset){
proto_tree_add_text(tree, tvb, offset, -1, "Internal error, zero-byte RTSE PDU");
offset = tvb_length(tvb);
break;
}
}
}
top_tree = NULL;
}
static void rtse_reassemble_init (void)
{
fragment_table_init (&rtse_segment_table);
reassembled_table_init (&rtse_reassembled_table);
}
/*--- proto_register_rtse -------------------------------------------*/
void proto_register_rtse(void) {
/* List of fields */
static hf_register_info hf[] =
{
/* Fragment entries */
{ &hf_rtse_fragments,
{ "RTSE fragments", "rtse.fragments", FT_NONE, BASE_NONE,
NULL, 0x00, "Message fragments", HFILL } },
{ &hf_rtse_fragment,
{ "RTSE fragment", "rtse.fragment", FT_FRAMENUM, BASE_NONE,
NULL, 0x00, "Message fragment", HFILL } },
{ &hf_rtse_fragment_overlap,
{ "RTSE fragment overlap", "rtse.fragment.overlap", FT_BOOLEAN,
BASE_NONE, NULL, 0x00, "Message fragment overlap", HFILL } },
{ &hf_rtse_fragment_overlap_conflicts,
{ "RTSE fragment overlapping with conflicting data",
"rtse.fragment.overlap.conflicts", FT_BOOLEAN, BASE_NONE, NULL,
0x00, "Message fragment overlapping with conflicting data", HFILL } },
{ &hf_rtse_fragment_multiple_tails,
{ "RTSE has multiple tail fragments",
"rtse.fragment.multiple_tails", FT_BOOLEAN, BASE_NONE,
NULL, 0x00, "Message has multiple tail fragments", HFILL } },
{ &hf_rtse_fragment_too_long_fragment,
{ "RTSE fragment too long", "rtse.fragment.too_long_fragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x00, "Message fragment too long",
HFILL } },
{ &hf_rtse_fragment_error,
{ "RTSE defragmentation error", "rtse.fragment.error", FT_FRAMENUM,
BASE_NONE, NULL, 0x00, "Message defragmentation error", HFILL } },
{ &hf_rtse_reassembled_in,
{ "Reassembled RTSE in frame", "rtse.reassembled.in", FT_FRAMENUM, BASE_NONE,
NULL, 0x00, "This RTSE packet is reassembled in this frame", HFILL } },
#include "packet-rtse-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_rtse,
&ett_rtse_unknown,
&ett_rtse_fragment,
&ett_rtse_fragments,
#include "packet-rtse-ettarr.c"
};
module_t *rtse_module;
/* Register protocol */
proto_rtse = proto_register_protocol(PNAME, PSNAME, PFNAME);
register_dissector("rtse", dissect_rtse, proto_rtse);
/* Register fields and subtrees */
proto_register_field_array(proto_rtse, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine (&rtse_reassemble_init);
rtse_module = prefs_register_protocol_subtree("OSI", proto_rtse, NULL);
prefs_register_bool_preference(rtse_module, "reassemble",
"Reassemble segmented RTSE datagrams",
"Whether segmented RTSE datagrams should be reassembled."
" To use this option, you must also enable"
" \"Allow subdissectors to reassemble TCP streams\""
" in the TCP protocol settings.", &rtse_reassemble);
rtse_oid_dissector_table = register_dissector_table("rtse.oid", "RTSE OID Dissectors", FT_STRING, BASE_NONE);
oid_table=g_hash_table_new(g_str_hash, g_str_equal);
rtse_handle = find_dissector("rtse");
ros_handle = find_dissector("ros");
}
/*--- proto_reg_handoff_rtse --- */
void proto_reg_handoff_rtse(void) {
}
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