/* packet-t124.c * Routines for t124 packet dissection * Copyright 2010, Graeme Lunt * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #include #include #include "packet-per.h" #include "packet-ber.h" #include "packet-t124.h" #ifdef _MSC_VER /* disable: "warning C4146: unary minus operator applied to unsigned type, result still unsigned" */ #pragma warning(disable:4146) #endif #define PNAME "GENERIC-CONFERENCE-CONTROL T.124" #define PSNAME "T.124" #define PFNAME "t124" /* Initialize the protocol and registered fields */ static int proto_t124 = -1; static proto_tree *top_tree = NULL; #include "packet-t124-hf.c" /* Initialize the subtree pointers */ static int ett_t124 = -1; static int ett_t124_connectGCCPDU = -1; static int hf_t124_ConnectData = -1; static int hf_t124_connectGCCPDU = -1; static int hf_t124_DomainMCSPDU_PDU = -1; static guint32 channelId = -1; static const char *t124Identifier = NULL; /* extensions identifier */ static tvbuff_t *t124NSIdentifier = NULL; /* extensions non-standard identifier */ static dissector_table_t t124_ns_dissector_table=NULL; static dissector_table_t t124_sd_dissector_table=NULL; #include "packet-t124-ett.c" #include "packet-t124-fn.c" static const per_sequence_t t124Heur_sequence[] = { { &hf_t124_t124Identifier , ASN1_NO_EXTENSIONS , ASN1_NOT_OPTIONAL, dissect_t124_Key }, { NULL, 0, 0, NULL } }; void register_t124_ns_dissector(const char *nsKey, dissector_t dissector, int proto) { dissector_handle_t dissector_handle; dissector_handle=create_dissector_handle(dissector, proto); dissector_add_string("t124.ns", nsKey, dissector_handle); } void register_t124_sd_dissector(packet_info *pinfo _U_, guint32 channelId, dissector_t dissector, int proto) { /* XXX: we should keep the sub-dissectors list per conversation as the same channels may be used. While we are just using RDP over T.124, then we can get away with it. */ dissector_handle_t dissector_handle; dissector_handle=create_dissector_handle(dissector, proto); dissector_add_uint("t124.sd", channelId, dissector_handle); } guint32 t124_get_last_channelId(void) { return channelId; } void t124_set_top_tree(proto_tree *tree) { top_tree = tree; } int dissect_DomainMCSPDU_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) { int offset = 0; asn1_ctx_t asn1_ctx; asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo); offset = dissect_t124_DomainMCSPDU(tvb, offset, &asn1_ctx, tree, hf_t124_DomainMCSPDU_PDU); offset += 7; offset >>= 3; return offset; } static int dissect_t124_new(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *parent_tree) { proto_item *item = NULL; proto_tree *tree = NULL; asn1_ctx_t asn1_ctx; top_tree = parent_tree; col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.125"); col_clear(pinfo->cinfo, COL_INFO); item = proto_tree_add_item(parent_tree, proto_t124, tvb, 0, tvb_length(tvb), ENC_NA); tree = proto_item_add_subtree(item, ett_t124); asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo); dissect_t124_ConnectData(tvb, 0, &asn1_ctx, tree, hf_t124_ConnectData); return tvb_length(tvb); } static void dissect_t124(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *parent_tree) { dissect_t124_new(tvb, pinfo, parent_tree); } static gboolean dissect_t124_heur(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *parent_tree) { asn1_ctx_t asn1_ctx; asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo); t124Identifier = NULL; (void) dissect_per_sequence(tvb, 0, &asn1_ctx, NULL, -1, -1, t124Heur_sequence); if((t124Identifier != NULL) && (strcmp(t124Identifier, "0.0.20.124.0.1") == 0)) { dissect_t124(tvb, pinfo, parent_tree); } return FALSE; } /*--- proto_register_t124 -------------------------------------------*/ void proto_register_t124(void) { /* List of fields */ static hf_register_info hf[] = { { &hf_t124_ConnectData, { "ConnectData", "t124.ConnectData", FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_t124_connectGCCPDU, { "connectGCCPDU", "t124.connectGCCPDU", FT_UINT32, BASE_DEC, VALS(t124_ConnectGCCPDU_vals), 0, NULL, HFILL }}, { &hf_t124_DomainMCSPDU_PDU, { "DomainMCSPDU", "t124.DomainMCSPDU", FT_UINT32, BASE_DEC, VALS(t124_DomainMCSPDU_vals), 0, NULL, HFILL }}, #include "packet-t124-hfarr.c" }; /* List of subtrees */ static gint *ett[] = { &ett_t124, &ett_t124_connectGCCPDU, #include "packet-t124-ettarr.c" }; /* Register protocol */ proto_t124 = proto_register_protocol(PNAME, PSNAME, PFNAME); /* Register fields and subtrees */ proto_register_field_array(proto_t124, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); t124_ns_dissector_table = register_dissector_table("t124.ns", "T.124 H.221 Non Standard Dissectors", FT_STRING, BASE_NONE); t124_sd_dissector_table = register_dissector_table("t124.sd", "T.124 H.221 Send Data Dissectors", FT_UINT32, BASE_NONE); new_register_dissector("t124", dissect_t124_new, proto_t124); } void proto_reg_handoff_t124(void) { register_ber_oid_dissector("0.0.20.124.0.1", dissect_t124, proto_t124, "Generic Conference Control"); heur_dissector_add("t125", dissect_t124_heur, proto_t124); }