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packet-h245-template.c

/* packet-h245_asn1.c
 * Routines for h245 packet dissection
 * Copyright 2004, Anders Broman <anders.broman@ericsson.com>
 *
 * $Id: packet-h245-template.c 18652 2006-07-04 06:49:53Z kukosa $
 *
 * 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.
 *
 * To quote the author of the previous H245 dissector:
 *   "This is a complete replacement of the previous limitied dissector
 * that Ronnie was crazy enough to write by hand. It was a lot of time
 * to hack it by hand, but it is incomplete and buggy and it is good when
 * it will go away."
 * Ronnie did a great job and all the VoIP users had made good use of it!
 * Credit to Tomas Kukosa for developing the asn2wrs compiler.
 *
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <glib.h>
#include <epan/packet.h>
#include <epan/conversation.h>

#include <stdio.h>
#include <string.h>

#include <epan/prefs.h>
#include <epan/t35.h>
#include <epan/emem.h>
#include <epan/oid_resolv.h>
#include "tap.h"
#include "packet-tpkt.h"
#include "packet-per.h"
#include "packet-h245.h"
#include "packet-rtp.h"
#include "packet-rtcp.h"
#include "packet-t38.h"

#define PNAME  "MULTIMEDIA-SYSTEM-CONTROL"
#define PSNAME "H.245"
#define PFNAME "h245"

static dissector_handle_t rtp_handle=NULL;
static dissector_handle_t rtcp_handle=NULL;
static dissector_handle_t t38_handle=NULL;
static dissector_table_t nsp_object_dissector_table;
static dissector_table_t nsp_h221_dissector_table;
static dissector_handle_t nsp_handle;
static dissector_handle_t data_handle;
static dissector_handle_t h245_handle;
static dissector_handle_t MultimediaSystemControlMessage_handle;
static dissector_handle_t h263_handle = NULL;
static dissector_handle_t amr_handle = NULL;

static void init_h245_packet_info(h245_packet_info *pi);
static int hf_h245_pdu_type = -1;
static int hf_h245Manufacturer = -1;
static int h245_tap = -1;
static int ett_h245 = -1;
static int h245dg_tap = -1;
h245_packet_info *h245_pi=NULL;

static gboolean h245_reassembly = TRUE;
static gboolean h245_shorttypes = FALSE;
static const value_string h245_RequestMessage_short_vals[] = {
      {  0, "NSM" },
      {  1, "MSD" },
      {  2, "TCS" },
      {  3, "OLC" },
      {  4, "CLC" },
      {  5, "RCC" },
      {  6, "MES" },
      {  7, "RME" },
      {  8, "RM" },
      {  9, "RTDR" },
      { 10, "MLR" },
      { 11, "CMR" },
      { 12, "CR" },
      { 13, "MR" },
      { 14, "LCRR" },
      { 15, "GR" },
      {  0, NULL }
};
static const value_string h245_ResponseMessage_short_vals[] = {
      {  0, "NSM" },
      {  1, "MSDAck" },
      {  2, "MSDReject" },
      {  3, "TCSAck" },
      {  4, "TCSReject" },
      {  5, "OLCAck" },
      {  6, "OLCReject" },
      {  7, "CLCAck" },
      {  8, "RCCAck" },
      {  9, "RCCReject" },
      { 10, "MESAck" },
      { 11, "MESReject" },
      { 12, "RMEAck" },
      { 13, "RMEReject" },
      { 14, "RMAck" },
      { 15, "RMReject" },
      { 16, "RTDResponse" },
      { 17, "MLAck" },
      { 18, "MLReject" },
      { 19, "CMResponse" },
      { 20, "CResponse" },
      { 21, "MResponse" },
      { 22, "LCRAck" },
      { 23, "LCRReject" },
      { 24, "GR" },
      {  0, NULL }
};
static const value_string h245_IndicationMessage_short_vals[] = {
      {  0, "NSM" },
      {  1, "FNU" },
      {  2, "MSDRelease" },
      {  3, "TCSRelease" },
      {  4, "OLCConfirm" },
      {  5, "RCCRelease" },
      {  6, "MESRelease" },
      {  7, "RMERelease" },
      {  8, "RMRelease" },
      {  9, "MI" },
      { 10, "JI" },
      { 11, "H223SI" },
      { 12, "NATMVCI" },
      { 13, "UII" },
      { 14, "H2250MSI" },
      { 15, "MCLI" },
      { 16, "CI" },
      { 17, "VI" },
      { 18, "FNS" },
      { 19, "MultilinkIndication" },
      { 20, "LCRRelease" },
      { 21, "FCIndication" },
      { 22, "MMRI" },
      { 22, "GI" },
      {  0, NULL }
};
static const value_string h245_CommandMessage_short_vals[] = {
      {  0, "NSM" },
      {  1, "MLOC" },
      {  2, "STCS" },
      {  3, "EC" },
      {  4, "FCC" },
      {  5, "ESC" },
      {  6, "MC" },
      {  7, "CMC" },
      {  8, "CC" },
      {  9, "H223MR" },
      { 10, "NATMVCC" },
      { 11, "MMRC" },
      { 12, "GC" },
      {  0, NULL }
};
static const value_string h245_AudioCapability_short_vals[] = {
        {  0, "nonStd" },
        {  1, "g711A" },
        {  2, "g711A56k" },
        {  3, "g711U" },
        {  4, "g711U56k" },
        {  5, "g722-64k" },
        {  6, "g722-56k" },
        {  7, "g722-48k" },
        {  8, "g7231" },
        {  9, "g728" },
        { 10, "g729" },
        { 11, "g729A" },
        { 12, "is11172" },
        { 13, "is13818" },
        { 14, "g729B" },
        { 15, "g729AB" },
        { 16, "g7231C" },
        { 17, "gsmFR" },
        { 18, "gsmHR" },
        { 19, "gsmEFR" },
        { 20, "generic" },
        { 21, "g729Ext" },
        { 22, "vbd" },
        { 23, "audioTelEvent" },
        { 24, "audioTone" },
        {  0, NULL }
};

/* To put the codec type only in COL_INFO when
   an OLC is read */

const char* codec_type = NULL;
static const char *standard_oid_str;
static guint32 ipv4_address;
static guint32 ipv4_port;
static guint32 rtcp_ipv4_address;
static guint32 rtcp_ipv4_port;
static gboolean media_channel;
static gboolean media_control_channel;

/* NonStandardParameter */
static const char *nsiOID;
static guint32 h221NonStandard;
static guint32 t35CountryCode;
static guint32 t35Extension;
static guint32 manufacturerCode;

static const value_string h245_RFC_number_vals[] = {
      {  2190,    "RFC 2190 - H.263 Video Streams" },
      {  2429,    "RFC 2429 - 1998 Version of ITU-T Rec. H.263 Video (H.263+)" },
      {  3016,    "RFC 3016 - RTP Payload Format for MPEG-4 Audio/Visual Streams" },
      {  3267,    "RFC 3267 - Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB)" },
      {  0, NULL }
};

/* h223 multiplex codes */
static h223_set_mc_handle_t h223_set_mc_handle = NULL;
h223_mux_element *h223_me=NULL;
guint8 h223_mc=0;
void h245_set_h223_set_mc_handle( h223_set_mc_handle_t handle )
{
      h223_set_mc_handle = handle;
}

/* h223 logical channels */
typedef struct {
      h223_lc_params *fw_channel_params;
      h223_lc_params *rev_channel_params;
} h223_pending_olc;

static GHashTable*          h223_pending_olc_reqs[] = { NULL, NULL };
static dissector_handle_t   h245_lc_dissector;
static guint16              h245_lc_temp;
static guint16              h223_fw_lc_num;
static guint16              h223_rev_lc_num;
static h223_lc_params      *h223_lc_params_temp;
static h223_lc_params      *h223_fw_lc_params;
static h223_lc_params      *h223_rev_lc_params;
static h223_add_lc_handle_t h223_add_lc_handle = NULL;

static void h223_lc_init_dir( int dir )
{
      if ( h223_pending_olc_reqs[dir] )
            g_hash_table_destroy( h223_pending_olc_reqs[dir] );
      h223_pending_olc_reqs[dir] = g_hash_table_new( g_direct_hash, g_direct_equal );
}

static void h223_lc_init( void )
{
      h223_lc_init_dir( P2P_DIR_SENT );
      h223_lc_init_dir( P2P_DIR_RECV );
      h223_lc_params_temp = NULL;
      h245_lc_dissector = NULL;
      h223_fw_lc_num = 0;
}

void h245_set_h223_add_lc_handle( h223_add_lc_handle_t handle )
{
      h223_add_lc_handle = handle;
}

/* Initialize the protocol and registered fields */
int proto_h245 = -1;
#include "packet-h245-hf.c"

/* Initialize the subtree pointers */
#include "packet-h245-ett.c"

#include "packet-h245-fn.c"

static void
dissect_h245(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
      /*
       * MultimediaSystemControlMessage_handle is the handle for
       * dissect_h245_h245, so we don't want to do any h245_pi or tap stuff here.
       */
      dissect_tpkt_encap(tvb, pinfo, parent_tree, h245_reassembly, MultimediaSystemControlMessage_handle);
}

static void reset_h245_pi(void *dummy _U_)
{
      h245_pi = NULL; /* Make sure we don't leave ep_alloc()ated memory lying around */
}

static void
dissect_h245_h245(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
      proto_item *it;
      proto_tree *tr;
      guint32 offset=0;
      asn1_ctx_t asn1_ctx;

      if (check_col(pinfo->cinfo, COL_PROTOCOL)){
            col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
      }

      it=proto_tree_add_protocol_format(parent_tree, proto_h245, tvb, 0, tvb_length(tvb), PSNAME);
      tr=proto_item_add_subtree(it, ett_h245);

      /* assume that whilst there is more tvb data, there are more h245 commands */
      while ( tvb_length_remaining( tvb, offset>>3 )>0 ){
            CLEANUP_PUSH(reset_h245_pi, NULL);
            h245_pi=ep_alloc(sizeof(h245_packet_info));
            init_h245_packet_info(h245_pi);
            asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
            offset = dissect_h245_MultimediaSystemControlMessage(tvb, offset, &asn1_ctx, tr, hf_h245_pdu_type);
            tap_queue_packet(h245dg_tap, pinfo, h245_pi);
            offset = (offset+0x07) & 0xfffffff8;
            CLEANUP_CALL_AND_POP;
      }
}

void
dissect_h245_OpenLogicalChannelCodec(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, char *codec_str) {
  dissect_OpenLogicalChannel_PDU(tvb, pinfo, tree);

  if (h245_pi != NULL) h245_pi->msg_type = H245_OpenLogChn;

  if (codec_str && codec_type){
        strncpy(codec_str, codec_type, 50);
  }

}

/*--- proto_register_h245 -------------------------------------------*/
void proto_register_h245(void) {

  /* List of fields */
  static hf_register_info hf[] = {
    { &hf_h245_pdu_type,
 { "PDU Type", "h245.pdu_type", FT_UINT32, BASE_DEC,
            VALS(h245_MultimediaSystemControlMessage_vals), 0, "Type of H.245 PDU", HFILL }},
      { &hf_h245Manufacturer,
            { "H.245 Manufacturer", "h245.Manufacturer", FT_UINT32, BASE_HEX,
            VALS(H221ManufacturerCode_vals), 0, "h245.H.221 Manufacturer", HFILL }},
#include "packet-h245-hfarr.c"
  };

  /* List of subtrees */
  static gint *ett[] = {
        &ett_h245,
#include "packet-h245-ettarr.c"
  };
  module_t *h245_module;

  /* Register protocol */
  proto_h245 = proto_register_protocol(PNAME, PSNAME, PFNAME);
  /* Register fields and subtrees */
  proto_register_field_array(proto_h245, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));

  /* From Ronnie Sahlbergs original H245 dissector */

  h245_module = prefs_register_protocol(proto_h245, NULL);
  prefs_register_bool_preference(h245_module, "reassembly",
            "Reassemble H.245 messages spanning multiple TCP segments",
            "Whether the H.245 dissector should reassemble messages spanning multiple TCP segments."
            " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
            &h245_reassembly);
  prefs_register_bool_preference(h245_module, "shorttypes",
            "Show short message types",
            "Whether the dissector should show short names or the long names from the standard",
            &h245_shorttypes);
  register_dissector("h245dg", dissect_h245_h245, proto_h245);
  register_dissector("h245", dissect_h245, proto_h245);

  nsp_object_dissector_table = register_dissector_table("h245.nsp.object", "H.245 NonStandardParameter (object)", FT_STRING, BASE_NONE);
  nsp_h221_dissector_table = register_dissector_table("h245.nsp.h221", "H.245 NonStandardParameter (h221)", FT_UINT32, BASE_HEX);
  h245_tap = register_tap("h245");
  h245dg_tap = register_tap("h245dg");

  add_oid_str_name("0.0.8.239.1.1","itu-t(0) recommendation(0) h(8) h239(239) generic-capabilities(1) h239ControlCapability(1)");
  add_oid_str_name("0.0.8.239.1.2","itu-t(0) recommendation(0) h(8) h239(239) generic-capabilities(1) h239ExtendedVideoCapability(2)");
  add_oid_str_name("0.0.8.239.2","itu-t(0) recommendation(0) h(8) h239(239) generic-message(2)");
  add_oid_str_name("0.0.8.245.0.3","itu-t(0) recommendation(0) h(8) h245(245) version(0) 3");
  add_oid_str_name("0.0.8.245.0.4","itu-t(0) recommendation(0) h(8) h245(245) version(0) 4");
  add_oid_str_name("0.0.8.245.0.5","itu-t(0) recommendation(0) h(8) h245(245) version(0) 5");
  add_oid_str_name("0.0.8.245.0.6","itu-t(0) recommendation(0) h(8) h245(245) version(0) 6");
  add_oid_str_name("0.0.8.245.0.7","itu-t(0) recommendation(0) h(8) h245(245) version(0) 7");
  add_oid_str_name("0.0.8.245.0.8","itu-t(0) recommendation(0) h(8) h245(245) version(0) 8");
  add_oid_str_name("0.0.8.245.0.10","itu-t(0) recommendation(0) h(8) h245(245) version(0) 10");
  add_oid_str_name("0.0.8.245.1.0.0","itu-t(0) recommendation(0) h(8) h245(245) generic-capabilities(1) video (0) ISO/IEC 14496-2 (0)= MPEG-4 video");
  add_oid_str_name("0.0.8.245.1.1.0","itu-t(0) recommendation(0) h(8) h245(245) generic-capabilities(1) audio (1) ISO/IEC 14496-3 (0)= MPEG-4 audio");
  add_oid_str_name("0.0.8.245.1.1.1","itu-t(0) recommendation(0) h(8) h245(245) generic-capabilities(1) audio(1) amr(1)");

  add_oid_str_name("0.0.8.241.0.0.1","itu-t(0) recommendation(0) h(8) h241(241) specificVideoCodecCapabilities(0) h264(0) generic-capabilities(1)");


}


/*--- proto_reg_handoff_h245 ---------------------------------------*/
void proto_reg_handoff_h245(void) {
      rtp_handle = find_dissector("rtp");
      rtcp_handle = find_dissector("rtcp");
      t38_handle = find_dissector("t38");
      data_handle = find_dissector("data");
      h263_handle = find_dissector("h263data");
      amr_handle = find_dissector("amr_if2");


      h245_handle=create_dissector_handle(dissect_h245, proto_h245);
      dissector_add_handle("tcp.port", h245_handle);
      MultimediaSystemControlMessage_handle=create_dissector_handle(dissect_h245_h245, proto_h245);
      dissector_add_handle("udp.port", MultimediaSystemControlMessage_handle);

      h223_lc_init();
}

static void init_h245_packet_info(h245_packet_info *pi)
{
        if(pi == NULL) {
                return;
        }

        pi->msg_type = H245_OTHER;
            pi->frame_label[0] = '\0';
            g_snprintf(pi->comment, sizeof(pi->comment), "H245 ");
}


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