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packet-classicstun.c

/* packet-classicstun.c
 * Routines for Simple Traversal of UDP Through NAT dissection
 * Copyright 2003, Shiang-Ming Huang <smhuang@pcs.csie.nctu.edu.tw>
 *
 * $Id: packet-classicstun.c 32790 2010-05-13 18:28:34Z morriss $
 *
 * 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.
 *
 * Please refer to RFC 3489 for protocol detail.
 * (supports extra message attributes described in draft-ietf-behave-rfc3489bis-00)
 */

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

#include <glib.h>

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

/* Initialize the protocol and registered fields */
static int proto_classicstun = -1;

static int hf_classicstun_type = -1;            /* CLASSIC-STUN message header */
static int hf_classicstun_length = -1;
static int hf_classicstun_id = -1;
static int hf_classicstun_att = -1;
static int hf_classicstun_response_in = -1;
static int hf_classicstun_response_to = -1;
static int hf_classicstun_time = -1;


static int classicstun_att_type = -1;           /* CLASSIC-STUN attribute fields */
static int classicstun_att_length = -1;
static int classicstun_att_value = -1;
static int classicstun_att_family = -1;
static int classicstun_att_ipv4 = -1;
static int classicstun_att_ipv6 = -1;
static int classicstun_att_port = -1;
static int classicstun_att_change_ip = -1;
static int classicstun_att_change_port = -1;
static int classicstun_att_unknown = -1;
static int classicstun_att_error_class = -1;
static int classicstun_att_error_number = -1;
static int classicstun_att_error_reason = -1;
static int classicstun_att_server_string = -1;
static int classicstun_att_xor_ipv4 = -1;
static int classicstun_att_xor_ipv6 = -1;
static int classicstun_att_xor_port = -1;
static int classicstun_att_lifetime = -1;
static int classicstun_att_magic_cookie = -1;
static int classicstun_att_bandwidth = -1;
static int classicstun_att_data = -1;
static int classicstun_att_connection_request_binding = -1;

/* Structure containing transaction specific information */
typedef struct _classicstun_transaction_t {
      guint32 req_frame;
      guint32 rep_frame;
      nstime_t req_time;
} classicstun_transaction_t;

/* Structure containing conversation specific information */
typedef struct _classicstun_conv_info_t {
      emem_tree_t *pdus;
} classicstun_conv_info_t;


/* Message Types */
#define BINDING_REQUEST             0x0001
#define BINDING_RESPONSE            0x0101
#define BINDING_ERROR_RESPONSE            0x0111
#define SHARED_SECRET_REQUEST       0x0002
#define SHARED_SECRET_RESPONSE            0x0102
#define SHARED_SECRET_ERROR_RESPONSE      0x1112
#define ALLOCATE_REQUEST            0x0003
#define ALLOCATE_RESPONSE           0x0103
#define ALLOCATE_ERROR_RESPONSE           0x0113
#define SEND_REQUEST                0x0004
#define SEND_RESPONSE               0x0104
#define SEND_ERROR_RESPONSE         0x0114
#define DATA_INDICATION             0x0115
#define SET_ACTIVE_DESTINATION_REQUEST    0x0006
#define SET_ACTIVE_DESTINATION_RESPONSE   0x0106
#define SET_ACTIVE_DESTINATION_ERROR_RESPONSE   0x0116


/* Message classes */
#define CLASS_MASK      0xC110
#define REQUEST         0x0000
#define INDICATION      0x0001
#define RESPONSE  0x0010
#define ERROR_RESPONSE  0x0011

/* Attribute Types */
#define MAPPED_ADDRESS        0x0001
#define RESPONSE_ADDRESS      0x0002
#define CHANGE_REQUEST        0x0003
#define SOURCE_ADDRESS        0x0004
#define CHANGED_ADDRESS       0x0005
#define USERNAME        0x0006
#define PASSWORD        0x0007
#define MESSAGE_INTEGRITY     0x0008
#define ERROR_CODE            0x0009
#define UNKNOWN_ATTRIBUTES    0x000a
#define REFLECTED_FROM        0x000b
#define LIFETIME        0x000d
#define ALTERNATE_SERVER      0x000e
#define MAGIC_COOKIE          0x000f
#define BANDWIDTH       0x0010
#define DESTINATION_ADDRESS   0x0011
#define REMOTE_ADDRESS        0x0012
#define DATA                  0x0013
#define NONCE                 0x0014
#define REALM                 0x0015
#define REQUESTED_ADDRESS_TYPE      0x0016
#define XOR_MAPPED_ADDRESS    0x8020
#define XOR_ONLY        0x0021
#define SERVER                0x8022
#define CONNECTION_REQUEST_BINDING      0xc001
#define BINDING_CHANGE                  0xc002



/* Initialize the subtree pointers */
static gint ett_classicstun = -1;
static gint ett_classicstun_att_type = -1;
static gint ett_classicstun_att = -1;


#define UDP_PORT_STUN   3478
#define TCP_PORT_STUN   3478


#define CLASSICSTUN_HDR_LEN   ((guint)20) /* CLASSIC-STUN message header length */
#define ATTR_HDR_LEN    4     /* CLASSIC-STUN attribute header length */


static const value_string messages[] = {
      {BINDING_REQUEST, "Binding Request"},
      {BINDING_RESPONSE, "Binding Response"},
      {BINDING_ERROR_RESPONSE, "Binding Error Response"},
      {SHARED_SECRET_REQUEST, "Shared Secret Request"},
      {SHARED_SECRET_RESPONSE, "Shared Secret Response"},
      {SHARED_SECRET_ERROR_RESPONSE, "Shared Secret Error Response"},
      {ALLOCATE_REQUEST, "Allocate Request"},
      {ALLOCATE_RESPONSE, "Allocate Response"},
      {ALLOCATE_ERROR_RESPONSE, "Allocate Error Response"},
      {SEND_REQUEST, "Send Request"},
      {SEND_RESPONSE, "Send Response"},
      {SEND_ERROR_RESPONSE, "Send Error Response"},
      {DATA_INDICATION, "Data Indication"},
      {SET_ACTIVE_DESTINATION_REQUEST, "Set Active Destination Request"},
      {SET_ACTIVE_DESTINATION_RESPONSE, "Set Active Destination Response"},
      {SET_ACTIVE_DESTINATION_ERROR_RESPONSE, "Set Active Destination Error Response"},
      {0x00, NULL}
};

static const value_string attributes[] = {
      {MAPPED_ADDRESS, "MAPPED-ADDRESS"},
      {RESPONSE_ADDRESS, "RESPONSE-ADDRESS"},
      {CHANGE_REQUEST, "CHANGE-REQUEST"},
      {SOURCE_ADDRESS, "SOURCE-ADDRESS"},
      {CHANGED_ADDRESS, "CHANGED-ADDRESS"},
      {USERNAME, "USERNAME"},
      {PASSWORD, "PASSWORD"},
      {MESSAGE_INTEGRITY, "MESSAGE-INTEGRITY"},
      {ERROR_CODE, "ERROR-CODE"},
      {REFLECTED_FROM, "REFLECTED-FROM"},
      {LIFETIME, "LIFETIME"},
      {ALTERNATE_SERVER, "ALTERNATE_SERVER"},
      {MAGIC_COOKIE, "MAGIC_COOKIE"},
      {BANDWIDTH, "BANDWIDTH"},
      {DESTINATION_ADDRESS, "DESTINATION_ADDRESS"},
      {REMOTE_ADDRESS, "REMOTE_ADDRESS"},
      {DATA, "DATA"},
      {NONCE, "NONCE"},
      {REALM, "REALM"},
      {REQUESTED_ADDRESS_TYPE, "REQUESTED_ADDRESS_TYPE"},
      {XOR_MAPPED_ADDRESS, "XOR_MAPPED_ADDRESS"},
      {XOR_ONLY, "XOR_ONLY"},
      {SERVER, "SERVER"},
      {CONNECTION_REQUEST_BINDING, "CONNECTION-REQUEST-BINDING"},
      {BINDING_CHANGE, "BINDING-CHANGE"},
      {0x00, NULL}
};

static const value_string attributes_family[] = {
      {0x0001, "IPv4"},
      {0x0002, "IPv6"},
      {0x00, NULL}
};

static int
dissect_classicstun(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{

      proto_item *ti;
      proto_item *ta;
      proto_tree *classicstun_tree;
      proto_tree *att_type_tree;
      proto_tree *att_tree;
      guint16 msg_type;
      guint16 msg_length;
      const char *msg_type_str;
      guint16 att_type;
      guint16 att_length;
      guint16 offset;
      guint   len;
      guint i;
      conversation_t *conversation;
      classicstun_conv_info_t *classicstun_info;
      classicstun_transaction_t * classicstun_trans;
      emem_tree_key_t transaction_id_key[2];
      guint32 transaction_id[4];


      /*
       * First check if the frame is really meant for us.
       */
      len = tvb_length(tvb);
      /* First, make sure we have enough data to do the check. */
      if (len < CLASSICSTUN_HDR_LEN)
            return 0;

      msg_type = tvb_get_ntohs(tvb, 0);

      if (msg_type & 0xC000 || tvb_get_ntohl(tvb, 4) == 0x2112a442)
            return 0;

      /* check if message type is correct */
      msg_type_str = match_strval(msg_type, messages);
      if (msg_type_str == NULL)
            return 0;

      msg_length = tvb_get_ntohs(tvb, 2);

      /* check if payload enough */
      if (len != CLASSICSTUN_HDR_LEN+msg_length)
            return 0;

      /* The message seems to be a valid CLASSIC-STUN message! */

      /* Create the transaction key which may be used
         to track the conversation */
      transaction_id[0] = tvb_get_ntohl(tvb, 4);
      transaction_id[1] = tvb_get_ntohl(tvb, 8);
      transaction_id[2] = tvb_get_ntohl(tvb, 12);
      transaction_id[3] = tvb_get_ntohl(tvb, 16);

      transaction_id_key[0].length = 4;
      transaction_id_key[0].key =  transaction_id;
      transaction_id_key[1].length = 0;
      transaction_id_key[1].key =  NULL;

      /*
       * Do we have a conversation for this connection?
       */
      conversation = find_or_create_conversation(pinfo);

      /*
       * Do we already have a state structure for this conv
       */
      classicstun_info = conversation_get_proto_data(conversation, proto_classicstun);
      if (!classicstun_info) {
            /* No.  Attach that information to the conversation, and add
             * it to the list of information structures.
             */
            classicstun_info = se_alloc(sizeof(classicstun_conv_info_t));
            classicstun_info->pdus=se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK, "classicstun_pdus");
            conversation_add_proto_data(conversation, proto_classicstun, classicstun_info);
      }

      if(!pinfo->fd->flags.visited){
            if (((msg_type & CLASS_MASK) >> 4) == REQUEST) {
                  /* This is a request */
                  classicstun_trans=se_alloc(sizeof(classicstun_transaction_t));
                  classicstun_trans->req_frame=pinfo->fd->num;
                  classicstun_trans->rep_frame=0;
                  classicstun_trans->req_time=pinfo->fd->abs_ts;
                  se_tree_insert32_array(classicstun_info->pdus, transaction_id_key,
                                     (void *)classicstun_trans);
            } else {
                  classicstun_trans=se_tree_lookup32_array(classicstun_info->pdus,
                                                 transaction_id_key);
                  if(classicstun_trans){
                        classicstun_trans->rep_frame=pinfo->fd->num;
                  }
            }
      } else {
            classicstun_trans=se_tree_lookup32_array(classicstun_info->pdus, transaction_id_key);
      }
      if(!classicstun_trans){
            /* create a "fake" pana_trans structure */
            classicstun_trans=ep_alloc(sizeof(classicstun_transaction_t));
            classicstun_trans->req_frame=0;
            classicstun_trans->rep_frame=0;
            classicstun_trans->req_time=pinfo->fd->abs_ts;
      }



      col_set_str(pinfo->cinfo, COL_PROTOCOL, "CLASSIC-STUN");

      col_add_fstr(pinfo->cinfo, COL_INFO, "Message: %s",
                 msg_type_str);

      if (tree) {
            guint transaction_id_first_word;

            ti = proto_tree_add_item(tree, proto_classicstun, tvb, 0, -1, FALSE);

            classicstun_tree = proto_item_add_subtree(ti, ett_classicstun);

            if (((msg_type & CLASS_MASK) >> 4) == REQUEST) {
                  if (classicstun_trans->rep_frame) {
                        proto_item *it;
                        it=proto_tree_add_uint(classicstun_tree, hf_classicstun_response_in,
                                           tvb, 0, 0,
                                           classicstun_trans->rep_frame);
                        PROTO_ITEM_SET_GENERATED(it);
                  }
            }
            else if ((((msg_type & CLASS_MASK) >> 4) == RESPONSE) ||
                   (((msg_type & CLASS_MASK) >> 4) == ERROR_RESPONSE)) {
                  /* This is a response */
                  if(classicstun_trans->req_frame){
                        proto_item *it;
                        nstime_t ns;

                        it=proto_tree_add_uint(classicstun_tree, hf_classicstun_response_to, tvb, 0, 0, classicstun_trans->req_frame);
                        PROTO_ITEM_SET_GENERATED(it);

                        nstime_delta(&ns, &pinfo->fd->abs_ts, &classicstun_trans->req_time);
                        it=proto_tree_add_time(classicstun_tree, hf_classicstun_time, tvb, 0, 0, &ns);
                        PROTO_ITEM_SET_GENERATED(it);
                  }

            }

            proto_tree_add_uint(classicstun_tree, hf_classicstun_type, tvb, 0, 2, msg_type);
            proto_tree_add_uint(classicstun_tree, hf_classicstun_length, tvb, 2, 2, msg_length);
            proto_tree_add_item(classicstun_tree, hf_classicstun_id, tvb, 4, 16, FALSE);

            /* Remember this (in host order) so we can show clear xor'd addresses */
            transaction_id_first_word = tvb_get_ntohl(tvb, 4);

            if (msg_length > 0) {
                  ta = proto_tree_add_item(classicstun_tree, hf_classicstun_att, tvb, CLASSICSTUN_HDR_LEN, msg_length, FALSE);
                  att_type_tree = proto_item_add_subtree(ta, ett_classicstun_att_type);

                  offset = CLASSICSTUN_HDR_LEN;

                  while( msg_length > 0) {
                        att_type = tvb_get_ntohs(tvb, offset); /* Type field in attribute header */
                        att_length = tvb_get_ntohs(tvb, offset+2); /* Length field in attribute header */

                        ta = proto_tree_add_text(att_type_tree, tvb, offset,
                                           ATTR_HDR_LEN+att_length,
                                           "Attribute: %s",
                                           val_to_str(att_type, attributes, "Unknown (0x%04x)"));
                        att_tree = proto_item_add_subtree(ta, ett_classicstun_att);

                        proto_tree_add_uint(att_tree, classicstun_att_type, tvb,
                                        offset, 2, att_type);
                        offset += 2;
                        if (ATTR_HDR_LEN+att_length > msg_length) {
                              proto_tree_add_uint_format(att_tree,
                                                   classicstun_att_length, tvb, offset, 2,
                                                   att_length,
                                                   "Attribute Length: %u (bogus, goes past the end of the message)",
                                                   att_length);
                              break;
                        }
                        proto_tree_add_uint(att_tree, classicstun_att_length, tvb,
                                        offset, 2, att_length);
                        offset += 2;
                        switch( att_type ){
                              case MAPPED_ADDRESS:
                              case RESPONSE_ADDRESS:
                              case SOURCE_ADDRESS:
                              case CHANGED_ADDRESS:
                              case REFLECTED_FROM:
                              case ALTERNATE_SERVER:
                              case DESTINATION_ADDRESS:
                              case REMOTE_ADDRESS:
                                    if (att_length < 2)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_family, tvb, offset+1, 1, FALSE);
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_port, tvb, offset+2, 2, FALSE);
                                    switch( tvb_get_guint8(tvb, offset+1) ){
                                          case 1:
                                                if (att_length < 8)
                                                      break;
                                                proto_tree_add_item(att_tree, classicstun_att_ipv4, tvb, offset+4, 4, FALSE);
                                                break;

                                          case 2:
                                                if (att_length < 20)
                                                      break;
                                                proto_tree_add_item(att_tree, classicstun_att_ipv6, tvb, offset+4, 16, FALSE);
                                                break;
                                    }
                                    break;

                              case CHANGE_REQUEST:
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_change_ip, tvb, offset, 4, FALSE);
                                    proto_tree_add_item(att_tree, classicstun_att_change_port, tvb, offset, 4, FALSE);
                                    break;

                              case USERNAME:
                              case PASSWORD:
                              case MESSAGE_INTEGRITY:
                              case NONCE:
                              case REALM:
                                    if (att_length < 1)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_value, tvb, offset, att_length, FALSE);
                                    break;

                              case ERROR_CODE:
                                    if (att_length < 3)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_error_class, tvb, offset+2, 1, FALSE);
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_error_number, tvb, offset+3, 1, FALSE);
                                    if (att_length < 5)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_error_reason, tvb, offset+4, (att_length-4), FALSE);
                                    break;

                              case LIFETIME:
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_lifetime, tvb, offset, 4, FALSE);
                                    break;

                              case MAGIC_COOKIE:
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_magic_cookie, tvb, offset, 4, FALSE);
                                    break;

                              case BANDWIDTH:
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_bandwidth, tvb, offset, 4, FALSE);
                                    break;

                              case DATA:
                                    proto_tree_add_item(att_tree, classicstun_att_data, tvb, offset, att_length, FALSE);
                                    break;

                              case UNKNOWN_ATTRIBUTES:
                                    for (i = 0; i < att_length; i += 4) {
                                          proto_tree_add_item(att_tree, classicstun_att_unknown, tvb, offset+i, 2, FALSE);
                                          proto_tree_add_item(att_tree, classicstun_att_unknown, tvb, offset+i+2, 2, FALSE);
                                    }
                                    break;

                              case SERVER:
                                    proto_tree_add_item(att_tree, classicstun_att_server_string, tvb, offset, att_length, FALSE);
                                    break;

                              case XOR_MAPPED_ADDRESS:
                                    if (att_length < 2)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_family, tvb, offset+1, 1, FALSE);
                                    if (att_length < 4)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_xor_port, tvb, offset+2, 2, FALSE);

                                    /* Show the port 'in the clear'
                                       XOR (host order) transid with (host order) xor-port.
                                       Add host-order port into tree. */
                                    ti = proto_tree_add_uint(att_tree, classicstun_att_port, tvb, offset+2, 2,
                                                       tvb_get_ntohs(tvb, offset+2) ^
                                                       (transaction_id_first_word >> 16));
                                    PROTO_ITEM_SET_GENERATED(ti);

                                    if (att_length < 8)
                                          break;
                                    switch( tvb_get_guint8(tvb, offset+1) ){
                                          case 1:
                                                if (att_length < 8)
                                                      break;
                                                proto_tree_add_item(att_tree, classicstun_att_xor_ipv4, tvb, offset+4, 4, FALSE);

                                                /* Show the address 'in the clear'.
                                                   XOR (host order) transid with (host order) xor-address.
                                                   Add in network order tree. */
                                                ti = proto_tree_add_ipv4(att_tree, classicstun_att_ipv4, tvb, offset+4, 4,
                                                                   g_htonl(tvb_get_ntohl(tvb, offset+4) ^
                                                                         transaction_id_first_word));
                                                PROTO_ITEM_SET_GENERATED(ti);
                                                break;

                                          case 2:
                                                if (att_length < 20)
                                                      break;
                                                proto_tree_add_item(att_tree, classicstun_att_xor_ipv6, tvb, offset+4, 16, FALSE);
                                                break;
                                    }
                                    break;

                              case REQUESTED_ADDRESS_TYPE:
                                    if (att_length < 2)
                                          break;
                                    proto_tree_add_item(att_tree, classicstun_att_family, tvb, offset+1, 1, FALSE);
                                    break;

                              case CONNECTION_REQUEST_BINDING:
                                    proto_tree_add_item(att_tree, classicstun_att_connection_request_binding, tvb, offset, att_length, FALSE);
                                    break;

                              default:
                                    break;
                        }
                        offset += att_length;
                        msg_length -= ATTR_HDR_LEN+att_length;
                  }
            }
      }
      return tvb_length(tvb);
}


static gboolean
dissect_classicstun_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      if (dissect_classicstun(tvb, pinfo, tree) == 0)
            return FALSE;

      return TRUE;
}




void
proto_register_classicstun(void)
{
      static hf_register_info hf[] = {
            { &hf_classicstun_type,
                  { "Message Type", "classicstun.type",     FT_UINT16,
                  BASE_HEX,   VALS(messages),   0x0,  NULL,       HFILL }
            },
            { &hf_classicstun_length,
                  { "Message Length",     "classicstun.length",   FT_UINT16,
                  BASE_HEX,   NULL, 0x0,  NULL, HFILL }
            },
            { &hf_classicstun_id,
                  { "Message Transaction ID",   "classicstun.id", FT_BYTES,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &hf_classicstun_att,
                  { "Attributes",         "classicstun.att",      FT_NONE,
                  BASE_NONE,        NULL,       0x0,  NULL, HFILL }
            },
            { &hf_classicstun_response_in,
                  { "Response In", "classicstun.response_in",
                  FT_FRAMENUM, BASE_NONE, NULL, 0x0,
                  "The response to this CLASSICSTUN query is in this frame", HFILL }},
            { &hf_classicstun_response_to,
                  { "Request In", "classicstun.response_to",
                  FT_FRAMENUM, BASE_NONE, NULL, 0x0,
                  "This is a response to the CLASSICSTUN Request in this frame", HFILL }},
            { &hf_classicstun_time,
                  { "Time", "classicstun.time",
                  FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
                  "The time between the Request and the Response", HFILL }},

            /* ////////////////////////////////////// */
            { &classicstun_att_type,
                  { "Attribute Type",     "classicstun.att.type", FT_UINT16,
                  BASE_HEX,   VALS(attributes), 0x0,  NULL, HFILL }
            },
            { &classicstun_att_length,
                  { "Attribute Length",   "classicstun.att.length",     FT_UINT16,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_value,
                  { "Value",  "classicstun.att.value",      FT_BYTES,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_family,
                  { "Protocol Family",    "classicstun.att.family",     FT_UINT16,
                  BASE_HEX,   VALS(attributes_family),      0x0,  NULL, HFILL }
            },
            { &classicstun_att_ipv4,
                  { "IP",           "classicstun.att.ipv4", FT_IPv4,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_ipv6,
                  { "IP",           "classicstun.att.ipv6", FT_IPv6,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_port,
                  { "Port",   "classicstun.att.port", FT_UINT16,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_change_ip,
                  { "Change IP","classicstun.att.change.ip",      FT_BOOLEAN,
                  16,   TFS(&tfs_set_notset),   0x0004,     NULL, HFILL}
            },
            { &classicstun_att_change_port,
                  { "Change Port","classicstun.att.change.port",  FT_BOOLEAN,
                  16,   TFS(&tfs_set_notset),   0x0002,     NULL, HFILL}
            },
            { &classicstun_att_unknown,
                  { "Unknown Attribute","classicstun.att.unknown",      FT_UINT16,
                  BASE_HEX,   NULL, 0x0,  NULL, HFILL}
            },
            { &classicstun_att_error_class,
                  { "Error Class","classicstun.att.error.class",  FT_UINT8,
                  BASE_DEC,   NULL, 0x07, NULL, HFILL}
            },
            { &classicstun_att_error_number,
                  { "Error Code","classicstun.att.error",   FT_UINT8,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL}
            },
            { &classicstun_att_error_reason,
                  { "Error Reason Phase","classicstun.att.error.reason",      FT_STRING,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL}
            },
            { &classicstun_att_xor_ipv4,
                  { "IP (XOR-d)",         "classicstun.att.ipv4-xord",  FT_IPv4,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_xor_ipv6,
                  { "IP (XOR-d)",         "classicstun.att.ipv6-xord",  FT_IPv6,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_xor_port,
                  { "Port (XOR-d)", "classicstun.att.port-xord",  FT_UINT16,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_server_string,
                  { "Server version","classicstun.att.server",    FT_STRING,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL}
            },
            { &classicstun_att_lifetime,
                  { "Lifetime",     "classicstun.att.lifetime",   FT_UINT32,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_magic_cookie,
                  { "Magic Cookie", "classicstun.att.magic.cookie",     FT_UINT32,
                  BASE_HEX,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_bandwidth,
                  { "Bandwidth",    "classicstun.att.bandwidth",  FT_UINT32,
                  BASE_DEC,   NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_data,
                  { "Data",   "classicstun.att.data", FT_BYTES,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
            { &classicstun_att_connection_request_binding,
                  { "Connection Request Binding", "classicstun.att.connection_request_binding", FT_STRING,
                  BASE_NONE,  NULL, 0x0,  NULL, HFILL }
            },
      };

/* Setup protocol subtree array */
      static gint *ett[] = {
            &ett_classicstun,
            &ett_classicstun_att_type,
            &ett_classicstun_att,
      };

/* Register the protocol name and description */
      proto_classicstun = proto_register_protocol("Simple Traversal of UDP Through NAT",
                                        "CLASSICSTUN", "classicstun");

/* Required function calls to register the header fields and subtrees used */
      proto_register_field_array(proto_classicstun, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));

      new_register_dissector("classicstun", dissect_classicstun, proto_classicstun);
      new_register_dissector("classicstun-heur", dissect_classicstun_heur, proto_classicstun);
}


void
proto_reg_handoff_classicstun(void)
{
#if 0 /* The stun dissector registers on these ports */
      dissector_handle_t classicstun_handle;

      classicstun_handle = find_dissector("classicstun");

      dissector_add("tcp.port", TCP_PORT_STUN, classicstun_handle);
      dissector_add("udp.port", UDP_PORT_STUN, classicstun_handle);
#endif
      heur_dissector_add("udp", dissect_classicstun_heur, proto_classicstun);
      heur_dissector_add("tcp", dissect_classicstun_heur, proto_classicstun);
}

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