388 lines
12 KiB
C
388 lines
12 KiB
C
/* packet-rtse_asn1.c
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* Routines for RTSE packet dissection
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* Graeme Lunt 2005
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/prefs.h>
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#include <epan/reassemble.h>
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#include <epan/asn1.h>
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#include <epan/expert.h>
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#include <stdio.h>
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#include <string.h>
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#include "packet-ber.h"
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#include "packet-pres.h"
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#include "packet-acse.h"
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#include "packet-ros.h"
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#include "packet-rtse.h"
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#define PNAME "X.228 OSI Reliable Transfer Service"
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#define PSNAME "RTSE"
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#define PFNAME "rtse"
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/* Initialize the protocol and registered fields */
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int proto_rtse = -1;
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static struct SESSION_DATA_STRUCTURE* session = NULL;
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static gboolean open_request=FALSE;
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static guint32 app_proto=0;
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static proto_tree *top_tree=NULL;
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/* Preferences */
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static gboolean rtse_reassemble = TRUE;
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#include "packet-rtse-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_rtse = -1;
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#include "packet-rtse-ett.c"
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static dissector_table_t rtse_oid_dissector_table=NULL;
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static GHashTable *oid_table=NULL;
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static gint ett_rtse_unknown = -1;
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static GHashTable *rtse_segment_table = NULL;
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static GHashTable *rtse_reassembled_table = NULL;
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static int hf_rtse_fragments = -1;
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static int hf_rtse_fragment = -1;
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static int hf_rtse_fragment_overlap = -1;
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static int hf_rtse_fragment_overlap_conflicts = -1;
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static int hf_rtse_fragment_multiple_tails = -1;
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static int hf_rtse_fragment_too_long_fragment = -1;
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static int hf_rtse_fragment_error = -1;
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static int hf_rtse_reassembled_in = -1;
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static gint ett_rtse_fragment = -1;
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static gint ett_rtse_fragments = -1;
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static const fragment_items rtse_frag_items = {
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/* Fragment subtrees */
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&ett_rtse_fragment,
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&ett_rtse_fragments,
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/* Fragment fields */
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&hf_rtse_fragments,
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&hf_rtse_fragment,
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&hf_rtse_fragment_overlap,
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&hf_rtse_fragment_overlap_conflicts,
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&hf_rtse_fragment_multiple_tails,
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&hf_rtse_fragment_too_long_fragment,
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&hf_rtse_fragment_error,
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/* Reassembled in field */
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&hf_rtse_reassembled_in,
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/* Tag */
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"RTSE fragments"
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};
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void
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register_rtse_oid_dissector_handle(const char *oid, dissector_handle_t dissector, int proto, const char *name, gboolean uses_ros)
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{
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/* XXX: Note that this fcn is called from proto_reg_handoff in *other* dissectors ... */
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static dissector_handle_t rtse_handle = NULL;
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static dissector_handle_t ros_handle = NULL;
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if (rtse_handle == NULL)
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rtse_handle = find_dissector("rtse");
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if (ros_handle == NULL)
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ros_handle = find_dissector("ros");
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/* save the name - but not used */
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g_hash_table_insert(oid_table, (gpointer)oid, (gpointer)name);
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/* register RTSE with the BER (ACSE) */
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register_ber_oid_dissector_handle(oid, rtse_handle, proto, name);
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if(uses_ros) {
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/* make sure we call ROS ... */
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dissector_add_string("rtse.oid", oid, ros_handle);
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/* and then tell ROS how to dissect the AS*/
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register_ros_oid_dissector_handle(oid, dissector, proto, name, TRUE);
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} else {
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/* otherwise we just remember how to dissect the AS */
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dissector_add_string("rtse.oid", oid, dissector);
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}
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}
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static int
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call_rtse_oid_callback(const char *oid, tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), tvb_reported_length_remaining(tvb, offset));
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if(!dissector_try_string(rtse_oid_dissector_table, oid, next_tvb, pinfo, tree)){
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proto_item *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);
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proto_tree *next_tree=proto_item_add_subtree(item, ett_rtse_unknown);
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expert_add_info_format (pinfo, item, PI_UNDECODED, PI_WARN,
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"RTSE: Dissector for OID %s not implemented", oid);
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dissect_unknown_ber(pinfo, next_tvb, offset, next_tree);
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}
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/*XXX until we change the #.REGISTER signature for _PDU()s
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* into new_dissector_t we have to do this kludge with
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* manually step past the content in the ANY type.
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*/
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offset+=tvb_length_remaining(tvb, offset);
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return offset;
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}
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static int
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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_)
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{
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const char *oid = NULL;
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if (actx->external.indirect_ref_present) {
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oid = (const char *)find_oid_by_pres_ctx_id(actx->pinfo, actx->external.indirect_reference);
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} else if (actx->external.direct_ref_present) {
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oid = actx->external.direct_reference;
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}
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if (oid)
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offset = call_rtse_oid_callback(oid, tvb, offset, actx->pinfo, top_tree ? top_tree : tree);
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return offset;
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}
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#include "packet-rtse-fn.c"
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/*
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* Dissect RTSE PDUs inside a PPDU.
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*/
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static void
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dissect_rtse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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int offset = 0;
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int old_offset;
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proto_item *item=NULL;
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proto_tree *tree=NULL;
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proto_tree *next_tree=NULL;
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tvbuff_t *next_tvb = NULL;
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tvbuff_t *data_tvb = NULL;
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fragment_data *frag_msg = NULL;
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guint32 fragment_length;
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guint32 rtse_id = 0;
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gboolean data_handled = FALSE;
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conversation_t *conversation = NULL;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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/* save parent_tree so subdissectors can create new top nodes */
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top_tree=parent_tree;
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/* do we have application context from the acse dissector? */
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if( !pinfo->private_data ){
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if(parent_tree){
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proto_tree_add_text(parent_tree, tvb, offset, -1,
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"Internal error:can't get application context from ACSE dissector.");
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}
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return ;
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} else {
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session = ( (struct SESSION_DATA_STRUCTURE*)(pinfo->private_data) );
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTSE");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (rtse_reassemble &&
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((session->spdu_type == SES_DATA_TRANSFER) ||
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(session->spdu_type == SES_MAJOR_SYNC_POINT))) {
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/* Use conversation index as fragment id */
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conversation = find_conversation (pinfo->fd->num,
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&pinfo->src, &pinfo->dst, pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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if (conversation != NULL) {
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rtse_id = conversation->index;
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}
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session->rtse_reassemble = TRUE;
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}
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if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {
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frag_msg = fragment_end_seq_next (pinfo, rtse_id, rtse_segment_table,
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rtse_reassembled_table);
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next_tvb = process_reassembled_data (tvb, offset, pinfo, "Reassembled RTSE",
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frag_msg, &rtse_frag_items, NULL, parent_tree);
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}
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if(parent_tree){
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item = proto_tree_add_item(parent_tree, proto_rtse, next_tvb ? next_tvb : tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_rtse);
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}
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if (rtse_reassemble && session->spdu_type == SES_DATA_TRANSFER) {
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/* strip off the OCTET STRING encoding - including any CONSTRUCTED OCTET STRING */
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dissect_ber_octet_string(FALSE, &asn1_ctx, NULL, tvb, offset, 0, &data_tvb);
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if (data_tvb) {
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fragment_length = tvb_length_remaining (data_tvb, 0);
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proto_tree_add_text(tree, data_tvb, 0, (fragment_length) ? -1 : 0,
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"RTSE segment data (%u byte%s)", fragment_length,
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plurality(fragment_length, "", "s"));
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frag_msg = fragment_add_seq_next (data_tvb, 0, pinfo,
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rtse_id, rtse_segment_table,
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rtse_reassembled_table, fragment_length, TRUE);
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if (frag_msg && pinfo->fd->num != frag_msg->reassembled_in) {
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/* Add a "Reassembled in" link if not reassembled in this frame */
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proto_tree_add_uint (tree, *(rtse_frag_items.hf_reassembled_in),
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data_tvb, 0, 0, frag_msg->reassembled_in);
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}
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pinfo->fragmented = TRUE;
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data_handled = TRUE;
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} else {
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fragment_length = tvb_length_remaining (tvb, offset);
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}
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if (check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO, "[RTSE fragment, %u byte%s]",
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fragment_length, plurality(fragment_length, "", "s"));
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} else if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {
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if (next_tvb) {
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/* ROS won't do this for us */
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session->ros_op = (ROS_OP_INVOKE | ROS_OP_ARGUMENT);
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offset=dissect_ber_external_type(FALSE, tree, next_tvb, 0, &asn1_ctx, -1, call_rtse_external_type_callback);
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} else {
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offset = tvb_length (tvb);
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}
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pinfo->fragmented = FALSE;
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data_handled = TRUE;
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}
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if (!data_handled) {
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while (tvb_reported_length_remaining(tvb, offset) > 0){
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old_offset=offset;
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offset=dissect_rtse_RTSE_apdus(TRUE, tvb, offset, &asn1_ctx, tree, -1);
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if(offset == old_offset){
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item = proto_tree_add_text(tree, tvb, offset, -1, "Unknown RTSE PDU");
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if(item){
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expert_add_info_format (pinfo, item, PI_UNDECODED, PI_WARN, "Unknown RTSE PDU");
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next_tree=proto_item_add_subtree(item, ett_rtse_unknown);
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dissect_unknown_ber(pinfo, tvb, offset, next_tree);
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}
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offset = tvb_length(tvb);
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break;
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}
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}
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}
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top_tree = NULL;
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}
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static void rtse_reassemble_init (void)
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{
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fragment_table_init (&rtse_segment_table);
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reassembled_table_init (&rtse_reassembled_table);
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}
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/*--- proto_register_rtse -------------------------------------------*/
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void proto_register_rtse(void) {
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/* List of fields */
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static hf_register_info hf[] =
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{
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/* Fragment entries */
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{ &hf_rtse_fragments,
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{ "RTSE fragments", "rtse.fragments", FT_NONE, BASE_NONE,
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NULL, 0x00, "Message fragments", HFILL } },
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{ &hf_rtse_fragment,
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{ "RTSE fragment", "rtse.fragment", FT_FRAMENUM, BASE_NONE,
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NULL, 0x00, "Message fragment", HFILL } },
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{ &hf_rtse_fragment_overlap,
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{ "RTSE fragment overlap", "rtse.fragment.overlap", FT_BOOLEAN,
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BASE_NONE, NULL, 0x0, "Message fragment overlap", HFILL } },
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{ &hf_rtse_fragment_overlap_conflicts,
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{ "RTSE fragment overlapping with conflicting data",
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"rtse.fragment.overlap.conflicts", FT_BOOLEAN, BASE_NONE, NULL,
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0x0, "Message fragment overlapping with conflicting data", HFILL } },
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{ &hf_rtse_fragment_multiple_tails,
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{ "RTSE has multiple tail fragments",
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"rtse.fragment.multiple_tails", FT_BOOLEAN, BASE_NONE,
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NULL, 0x0, "Message has multiple tail fragments", HFILL } },
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{ &hf_rtse_fragment_too_long_fragment,
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{ "RTSE fragment too long", "rtse.fragment.too_long_fragment",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Message fragment too long",
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HFILL } },
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{ &hf_rtse_fragment_error,
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{ "RTSE defragmentation error", "rtse.fragment.error", FT_FRAMENUM,
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BASE_NONE, NULL, 0x00, "Message defragmentation error", HFILL } },
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{ &hf_rtse_reassembled_in,
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{ "Reassembled RTSE in frame", "rtse.reassembled.in", FT_FRAMENUM, BASE_NONE,
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NULL, 0x00, "This RTSE packet is reassembled in this frame", HFILL } },
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#include "packet-rtse-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_rtse,
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&ett_rtse_unknown,
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&ett_rtse_fragment,
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&ett_rtse_fragments,
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#include "packet-rtse-ettarr.c"
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};
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module_t *rtse_module;
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/* Register protocol */
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proto_rtse = proto_register_protocol(PNAME, PSNAME, PFNAME);
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register_dissector("rtse", dissect_rtse, proto_rtse);
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/* Register fields and subtrees */
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proto_register_field_array(proto_rtse, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_init_routine (&rtse_reassemble_init);
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rtse_module = prefs_register_protocol_subtree("OSI", proto_rtse, NULL);
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prefs_register_bool_preference(rtse_module, "reassemble",
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"Reassemble segmented RTSE datagrams",
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"Whether segmented RTSE datagrams should be reassembled."
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" To use this option, you must also enable"
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" \"Allow subdissectors to reassemble TCP streams\""
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" in the TCP protocol settings.", &rtse_reassemble);
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rtse_oid_dissector_table = register_dissector_table("rtse.oid", "RTSE OID Dissectors", FT_STRING, BASE_NONE);
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oid_table=g_hash_table_new(g_str_hash, g_str_equal);
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}
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/*--- proto_reg_handoff_rtse --- */
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void proto_reg_handoff_rtse(void) {
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}
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