234 lines
6.7 KiB
C
234 lines
6.7 KiB
C
/* packet-t124.c
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* Routines for t124 packet dissection
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* Copyright 2010, Graeme Lunt
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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., 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 <glib.h>
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/conversation.h>
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#include <epan/asn1.h>
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#include "packet-per.h"
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#include "packet-ber.h"
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#include "packet-t124.h"
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#ifdef _MSC_VER
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/* disable: "warning C4146: unary minus operator applied to unsigned type, result still unsigned" */
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#pragma warning(disable:4146)
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#endif
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#define PNAME "GENERIC-CONFERENCE-CONTROL T.124"
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#define PSNAME "T.124"
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#define PFNAME "t124"
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void proto_register_t124(void);
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void proto_reg_handoff_t124(void);
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/* Initialize the protocol and registered fields */
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static int proto_t124 = -1;
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static proto_tree *top_tree = NULL;
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#include "packet-t124-hf.c"
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/* Initialize the subtree pointers */
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static int ett_t124 = -1;
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static int ett_t124_connectGCCPDU = -1;
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static int hf_t124_ConnectData = -1;
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static int hf_t124_connectGCCPDU = -1;
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static int hf_t124_DomainMCSPDU_PDU = -1;
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static guint32 channelId = -1;
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static const char *t124Identifier = NULL; /* extensions identifier */
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static tvbuff_t *t124NSIdentifier = NULL; /* extensions non-standard identifier */
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static dissector_table_t t124_ns_dissector_table=NULL;
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static dissector_table_t t124_sd_dissector_table=NULL;
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#include "packet-t124-ett.c"
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#include "packet-t124-fn.c"
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static const per_sequence_t t124Heur_sequence[] = {
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{ &hf_t124_t124Identifier , ASN1_NO_EXTENSIONS , ASN1_NOT_OPTIONAL, dissect_t124_Key },
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{ NULL, 0, 0, NULL }
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};
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void
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register_t124_ns_dissector(const char *nsKey, dissector_t dissector, int proto)
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{
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dissector_handle_t dissector_handle;
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dissector_handle=create_dissector_handle(dissector, proto);
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dissector_add_string("t124.ns", nsKey, dissector_handle);
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}
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void register_t124_sd_dissector(packet_info *pinfo _U_, guint32 channelId_param, dissector_t dissector, int proto)
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{
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/* XXX: we should keep the sub-dissectors list per conversation
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as the same channels may be used.
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While we are just using RDP over T.124, then we can get away with it.
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*/
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dissector_handle_t dissector_handle;
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dissector_handle=create_dissector_handle(dissector, proto);
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dissector_add_uint("t124.sd", channelId_param, dissector_handle);
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}
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guint32 t124_get_last_channelId(void)
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{
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return channelId;
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}
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void t124_set_top_tree(proto_tree *tree)
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{
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top_tree = tree;
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}
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int dissect_DomainMCSPDU_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
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int offset = 0;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
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offset = dissect_t124_DomainMCSPDU(tvb, offset, &asn1_ctx, tree, hf_t124_DomainMCSPDU_PDU);
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offset += 7; offset >>= 3;
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return offset;
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}
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static int
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dissect_t124_new(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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asn1_ctx_t asn1_ctx;
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top_tree = parent_tree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.124");
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col_clear(pinfo->cinfo, COL_INFO);
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item = proto_tree_add_item(parent_tree, proto_t124, tvb, 0, tvb_length(tvb), ENC_NA);
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tree = proto_item_add_subtree(item, ett_t124);
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
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dissect_t124_ConnectData(tvb, 0, &asn1_ctx, tree, hf_t124_ConnectData);
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return tvb_length(tvb);
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}
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static void
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dissect_t124(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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dissect_t124_new(tvb, pinfo, parent_tree, NULL);
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}
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static gboolean
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dissect_t124_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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{
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asn1_ctx_t asn1_ctx;
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gboolean failed = FALSE;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
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t124Identifier = NULL;
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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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* We (ab)use hf_t124_connectGCCPDU here just to give a valid entry...
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*/
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TRY {
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(void) dissect_per_sequence(tvb, 0, &asn1_ctx, NULL, hf_t124_connectGCCPDU, -1, t124Heur_sequence);
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} CATCH_BOUNDS_ERRORS {
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failed = TRUE;
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} ENDTRY;
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if (!failed && ((t124Identifier != NULL) &&
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(strcmp(t124Identifier, "0.0.20.124.0.1") == 0))) {
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dissect_t124(tvb, pinfo, parent_tree);
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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_t124 -------------------------------------------*/
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void proto_register_t124(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_t124_ConnectData,
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{ "ConnectData", "t124.ConnectData",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_t124_connectGCCPDU,
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{ "connectGCCPDU", "t124.connectGCCPDU",
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FT_UINT32, BASE_DEC, VALS(t124_ConnectGCCPDU_vals), 0,
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NULL, HFILL }},
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{ &hf_t124_DomainMCSPDU_PDU,
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{ "DomainMCSPDU", "t124.DomainMCSPDU",
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FT_UINT32, BASE_DEC, VALS(t124_DomainMCSPDU_vals), 0,
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NULL, HFILL }},
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#include "packet-t124-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_t124,
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&ett_t124_connectGCCPDU,
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#include "packet-t124-ettarr.c"
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};
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/* Register protocol */
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proto_t124 = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_t124, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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t124_ns_dissector_table = register_dissector_table("t124.ns", "T.124 H.221 Non Standard Dissectors", FT_STRING, BASE_NONE);
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t124_sd_dissector_table = register_dissector_table("t124.sd", "T.124 H.221 Send Data Dissectors", FT_UINT32, BASE_HEX);
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new_register_dissector("t124", dissect_t124_new, proto_t124);
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}
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void
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proto_reg_handoff_t124(void) {
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register_ber_oid_dissector("0.0.20.124.0.1", dissect_t124, proto_t124, "Generic Conference Control");
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heur_dissector_add("t125", dissect_t124_heur, proto_t124);
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}
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