forked from osmocom/wireshark
152 lines
4.2 KiB
C
152 lines
4.2 KiB
C
/* packet-t125.c
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* Routines for t125 packet dissection
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* Copyright 2007, Ronnie Sahlberg
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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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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/asn1.h>
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#include "packet-ber.h"
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#include "packet-per.h"
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#include "packet-t124.h"
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#define PNAME "MULTIPOINT-COMMUNICATION-SERVICE T.125"
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#define PSNAME "T.125"
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#define PFNAME "t125"
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void proto_register_t125(void);
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void proto_reg_handoff_t125(void);
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/* Initialize the protocol and registered fields */
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static int proto_t125 = -1;
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static proto_tree *top_tree = NULL;
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#include "packet-t125-hf.c"
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/* Initialize the subtree pointers */
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static int ett_t125 = -1;
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#include "packet-t125-ett.c"
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static heur_dissector_list_t t125_heur_subdissector_list;
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#include "packet-t125-fn.c"
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static int
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dissect_t125(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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{
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proto_item *item = NULL;
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proto_tree *tree = NULL;
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gint8 ber_class;
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gboolean pc;
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gint32 tag;
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top_tree = parent_tree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.125");
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col_clear(pinfo->cinfo, COL_INFO);
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item = proto_tree_add_item(parent_tree, proto_t125, tvb, 0, tvb_captured_length(tvb), ENC_NA);
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tree = proto_item_add_subtree(item, ett_t125);
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get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
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if ( (ber_class==BER_CLASS_APP) && (tag>=101) && (tag<=104) ){
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dissect_ConnectMCSPDU_PDU(tvb, pinfo, tree, NULL);
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} else {
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t124_set_top_tree(top_tree);
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dissect_DomainMCSPDU_PDU(tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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static gboolean
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dissect_t125_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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{
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gint8 ber_class;
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gboolean pc;
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gint32 tag;
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volatile gboolean failed;
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/*
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* We must catch all the "ran past the end of the packet" exceptions
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* here and, if we catch one, just return FALSE. It's too painful
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* to have a version of dissect_per_sequence() that checks all
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* references to the tvbuff before making them and returning "no"
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* if they would fail.
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*/
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failed = FALSE;
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TRY {
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/* could be BER */
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get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
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} CATCH_BOUNDS_ERRORS {
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failed = TRUE;
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} ENDTRY;
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/* is this strong enough ? */
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if (!failed && ((ber_class==BER_CLASS_APP) && ((tag>=101) && (tag<=104)))) {
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dissect_t125(tvb, pinfo, parent_tree, NULL);
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return TRUE;
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}
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return FALSE;
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}
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/*--- proto_register_t125 -------------------------------------------*/
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void proto_register_t125(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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#include "packet-t125-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_t125,
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#include "packet-t125-ettarr.c"
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};
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/* Register protocol */
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proto_t125 = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_t125, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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t125_heur_subdissector_list= register_heur_dissector_list("t125");
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new_register_dissector("t125", dissect_t125, proto_t125);
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}
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/*--- proto_reg_handoff_t125 ---------------------------------------*/
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void proto_reg_handoff_t125(void) {
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heur_dissector_add("cotp", dissect_t125_heur, "T.125 over COTP", "t125_cotp", proto_t125, HEURISTIC_ENABLE);
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heur_dissector_add("cotp_is", dissect_t125_heur, "T.125 over COTP (inactive subset)", "t125_cotp_is", proto_t125, HEURISTIC_ENABLE);
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}
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