1 files changed, 6 insertions, 2 deletions

diff --git a/libopie2/opienet/opcap.cpp b/libopie2/opienet/opcap.cpp
index 4d786f5..7463320 100644
--- a/libopie2/opienet/opcap.cpp
+++ b/libopie2/opienet/opcap.cpp
@@ -343,770 +343,774 @@ QString OARPPacket::type() const
     }
 }
 
 
 QHostAddress OARPPacket::senderIPV4Address() const
 {
     return EXTRACT_32BITS( &_arphdr->ar_sip );
 }
 
 
 QHostAddress OARPPacket::targetIPV4Address() const
 {
     return EXTRACT_32BITS( &_arphdr->ar_tip );
 }
 
 
 OMacAddress OARPPacket::senderMacAddress() const
 {
     return OMacAddress( _arphdr->ar_sha );
 }
 
 
 OMacAddress OARPPacket::targetMacAddress() const
 {
     return OMacAddress( _arphdr->ar_tha );
 }
 
 
 /*======================================================================================
  * OUDPPacket
  *======================================================================================*/
 
 
 OUDPPacket::OUDPPacket( const unsigned char* end, const struct udphdr* data, QObject* parent )
            :QObject( parent, "UDP" ), _udphdr( data )
 
 {
     odebug << "OUDPPacket::OUDPPacket(): decoding UDP header..." << oendl;
     odebug << "fromPort = " << fromPort() << oendl;
     odebug << "  toPort = " << toPort() << oendl;
 
     // TODO: Make this a case or a hash if we know more udp protocols
 
     if ( fromPort() == UDP_PORT_BOOTPS || fromPort() == UDP_PORT_BOOTPC ||
          toPort() == UDP_PORT_BOOTPS || toPort() == UDP_PORT_BOOTPC )
     {
         odebug << "seems to be part of a DHCP conversation => creating DHCP packet." << oendl;
         new ODHCPPacket( end, (const struct dhcp_packet*) (data+1), this );
     }
 }
 
 
 OUDPPacket::~OUDPPacket()
 {
 }
 
 
 int OUDPPacket::fromPort() const
 {
     return EXTRACT_16BITS( &_udphdr->source );
 }
 
 
 int OUDPPacket::toPort() const
 {
     return EXTRACT_16BITS( &_udphdr->dest );
 }
 
 
 int OUDPPacket::length() const
 {
     return EXTRACT_16BITS( &_udphdr->len );
 }
 
 
 int OUDPPacket::checksum() const
 {
     return EXTRACT_16BITS( &_udphdr->check );
 }
 
 
 /*======================================================================================
  * ODHCPPacket
  *======================================================================================*/
 
 
 ODHCPPacket::ODHCPPacket( const unsigned char* end, const struct dhcp_packet* data, QObject* parent )
            :QObject( parent, "DHCP" ), _dhcphdr( data )
 
 {
     odebug << "ODHCPPacket::ODHCPPacket(): decoding DHCP information..." << oendl;
     odebug << "DHCP opcode seems to be " << _dhcphdr->op << ": " << ( isRequest() ? "REQUEST" : "REPLY" ) << oendl;
     odebug << "clientAddress = " << clientAddress().toString() << oendl;
     odebug << "  yourAddress = " << yourAddress().toString() << oendl;
     odebug << "serverAddress = " << serverAddress().toString() << oendl;
     odebug << " relayAddress = " << relayAddress().toString() << oendl;
     odebug << "parsing DHCP options..." << oendl;
 
     _type = 0;
 
     const unsigned char* option = &_dhcphdr->options[4];
     char tag = -1;
     char len = -1;
 
     while ( ( tag = *option++ ) != -1 /* end of option field */ )
     {
         len = *option++;
         odebug << "recognized DHCP option #" << tag << ", length " << len << oendl;
 
         if ( tag == DHO_DHCP_MESSAGE_TYPE )
             _type = *option;
 
         option += len;
         if ( option >= end )
         {
             owarn << "DHCP parsing ERROR: sanity check says the packet is at its end!" << oendl;
             break;
         }
     }
 
     odebug << "DHCP type seems to be << " << type() << oendl;
 }
 
 
 ODHCPPacket::~ODHCPPacket()
 {
 }
 
 
 bool ODHCPPacket::isRequest() const
 {
     return ( _dhcphdr->op == 01 );
 }
 
 
 bool ODHCPPacket::isReply() const
 {
     return ( _dhcphdr->op == 02 );
 }
 
 
 QString ODHCPPacket::type() const
 {
     switch ( _type )
     {
         case 1: return "DISCOVER";
         case 2: return "OFFER";
         case 3: return "REQUEST";
         case 4: return "DECLINE";
         case 5: return "ACK";
         case 6: return "NAK";
         case 7: return "RELEASE";
         case 8: return "INFORM";
         default: owarn << "ODHCPPacket::type(): invalid DHCP type " << _dhcphdr->op << oendl; return "<unknown>";
     }
 }
 
 
 QHostAddress ODHCPPacket::clientAddress() const
 {
     return EXTRACT_32BITS( &_dhcphdr->ciaddr );
 }
 
 
 QHostAddress ODHCPPacket::yourAddress() const
 {
     return EXTRACT_32BITS( &_dhcphdr->yiaddr );
 }
 
 
 QHostAddress ODHCPPacket::serverAddress() const
 {
     return EXTRACT_32BITS( &_dhcphdr->siaddr );
 }
 
 
 QHostAddress ODHCPPacket::relayAddress() const
 {
     return EXTRACT_32BITS( &_dhcphdr->giaddr );
 }
 
 
 OMacAddress ODHCPPacket::clientMacAddress() const
 {
     return OMacAddress( _dhcphdr->chaddr );
 }
 
 
 /*======================================================================================
  * OTCPPacket
  *======================================================================================*/
 
 
 OTCPPacket::OTCPPacket( const unsigned char* end, const struct tcphdr* data, QObject* parent )
            :QObject( parent, "TCP" ), _tcphdr( data )
 
 {
     odebug << "OTCPPacket::OTCPPacket(): decoding TCP header..." << oendl;
 }
 
 
 OTCPPacket::~OTCPPacket()
 {
 }
 
 
 int OTCPPacket::fromPort() const
 {
     return EXTRACT_16BITS( &_tcphdr->source );
 }
 
 
 int OTCPPacket::toPort() const
 {
     return EXTRACT_16BITS( &_tcphdr->dest );
 }
 
 
 int OTCPPacket::seq() const
 {
     return EXTRACT_16BITS( &_tcphdr->seq );
 }
 
 
 int OTCPPacket::ack() const
 {
     return EXTRACT_16BITS( &_tcphdr->ack_seq );
 }
 
 
 int OTCPPacket::window() const
 {
     return EXTRACT_16BITS( &_tcphdr->window );
 }
 
 
 int OTCPPacket::checksum() const
 {
     return EXTRACT_16BITS( &_tcphdr->check );
 }
 
 /*======================================================================================
  * OPrismHeaderPacket
  *======================================================================================*/
 
 
 OPrismHeaderPacket::OPrismHeaderPacket( const unsigned char* end, const struct prism_hdr* data, QObject* parent )
                 :QObject( parent, "Prism" ), _header( data )
 
 {
     odebug << "OPrismHeaderPacket::OPrismHeaderPacket(): decoding PRISM header..." << oendl;
 
     odebug << "Signal Strength = " << data->signal.data << oendl;
 
     new OWaveLanPacket( end, (const struct ieee_802_11_header*) (data+1), this );
 }
 
 OPrismHeaderPacket::~OPrismHeaderPacket()
 {
 }
 
 
 unsigned int OPrismHeaderPacket::signalStrength() const
 {
     return _header->signal.data;
 }
 
 /*======================================================================================
  * OWaveLanPacket
  *======================================================================================*/
 
 
 OWaveLanPacket::OWaveLanPacket( const unsigned char* end, const struct ieee_802_11_header* data, QObject* parent )
                 :QObject( parent, "802.11" ), _wlanhdr( data )
 
 {
     odebug << "OWaveLanPacket::OWaveLanPacket(): decoding IEEE 802.11 header..." << oendl;
     odebug << "type = " << type() << oendl;
     odebug << "subType = " << subType() << oendl;
     odebug << "duration = " << duration() << oendl;
     odebug << "powermanagement = " << usesPowerManagement() << oendl;
     odebug << "payload is encrypted = " << ( usesWep() ? "yes" : "no" ) << oendl;
     odebug << "MAC1 = " << macAddress1().toString() << oendl;
     odebug << "MAC2 = " << macAddress2().toString() << oendl;
     odebug << "MAC3 = " << macAddress3().toString() << oendl;
     odebug << "MAC4 = " << macAddress4().toString() << oendl;
 
     switch ( type() )
     {
         case T_MGMT: new OWaveLanManagementPacket( end, (const struct ieee_802_11_mgmt_header*) data, this ); break;
         case T_DATA: new OWaveLanDataPacket( end, (const struct ieee_802_11_data_header*) data, this ); break;
         case T_CTRL: new OWaveLanControlPacket( end, (const struct ieee_802_11_control_header*) data, this ); break;
         default: odebug << "OWaveLanPacket::OWaveLanPacket(): Warning: Unknown major type = " << type() << oendl;
     }
 }
 
 OWaveLanPacket::~OWaveLanPacket()
 {
 }
 
 
 int OWaveLanPacket::duration() const
 {
     return _wlanhdr->duration;
 }
 
 
 OMacAddress OWaveLanPacket::macAddress1() const
 {
     return OMacAddress( _wlanhdr->mac1 );
 }
 
 
 OMacAddress OWaveLanPacket::macAddress2() const
 {
     return OMacAddress( _wlanhdr->mac2 );
 }
 
 
 OMacAddress OWaveLanPacket::macAddress3() const
 {
     return OMacAddress( _wlanhdr->mac3 );
 }
 
 
 OMacAddress OWaveLanPacket::macAddress4() const
 {
     return OMacAddress( _wlanhdr->mac4 );
 }
 
 
 int OWaveLanPacket::subType() const
 {
     return FC_SUBTYPE( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 int OWaveLanPacket::type() const
 {
     return FC_TYPE( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 int OWaveLanPacket::version() const
 {
     return FC_VERSION( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 bool OWaveLanPacket::fromDS() const
 {
     return FC_FROM_DS( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 bool OWaveLanPacket::toDS() const
 {
     return FC_TO_DS( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 bool OWaveLanPacket::usesPowerManagement() const
 {
     return FC_POWER_MGMT( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 bool OWaveLanPacket::usesWep() const
 {
     return FC_WEP( EXTRACT_LE_16BITS( &_wlanhdr->frame_control ) );
 }
 
 
 /*======================================================================================
  * OWaveLanManagementPacket
  *======================================================================================*/
 
 OWaveLanManagementPacket::OWaveLanManagementPacket( const unsigned char* end, const struct ieee_802_11_mgmt_header* data, OWaveLanPacket* parent )
                 :QObject( parent, "802.11 Management" ), _header( data ),
                 _body( (const struct ieee_802_11_mgmt_body*) (data+1) )
 {
     odebug << "OWaveLanManagementPacket::OWaveLanManagementPacket(): decoding frame..." << oendl;
     odebug << "Detected subtype is " << managementType() << oendl;
 
-    // grab tagged values
-    const unsigned char* ptr = (const unsigned char*) (_body+1);
+    // Grab tagged values.
+    // Beacons contain a 12 byte long fixed parameters set before the tagged parameters come,
+    // Other management frames don't - which is why we have to inspect the subtype here.
+
+    const unsigned char* ptr = managementType() == "Beacon" ?  (const unsigned char*) (_body+1) : (const unsigned char*) (_header+1);
+    
     while (ptr < end)
     {
         switch ( *ptr )
         {
             case E_SSID: new OWaveLanManagementSSID( end, (struct ssid_t*) ptr, this ); break;
             case E_FH: new OWaveLanManagementFH( end, (struct fh_t*) ptr, this ); break;
             case E_DS: new OWaveLanManagementDS( end, (struct ds_t*) ptr, this ); break;
             case E_RATES: new OWaveLanManagementRates( end, (struct rates_t*) ptr, this ); break;
             case E_CF: new OWaveLanManagementCF( end, (struct cf_t*) ptr, this ); break;
             case E_TIM: new OWaveLanManagementTim( end, (struct tim_t*) ptr, this ); break;
             case E_IBSS: new OWaveLanManagementIBSS( end, (struct ibss_t*) ptr, this ); break;
             case E_CHALLENGE: new OWaveLanManagementChallenge( end, (struct challenge_t*) ptr, this ); break;
         }
         ptr+= ( ( struct ssid_t* ) ptr )->length; // skip length of tagged value
         ptr+= 2; // skip tag ID and length
     }
 }
 
 
 OWaveLanManagementPacket::~OWaveLanManagementPacket()
 {
 }
 
 
 QString OWaveLanManagementPacket::managementType() const
 {
     switch ( FC_SUBTYPE( EXTRACT_LE_16BITS( &_header->fc ) ) )
     {
         case ST_ASSOC_REQUEST: return "AssociationRequest"; break;
         case ST_ASSOC_RESPONSE: return "AssociationResponse"; break;
         case ST_REASSOC_REQUEST: return "ReassociationRequest"; break;
         case ST_REASSOC_RESPONSE: return "ReassociationResponse"; break;
         case ST_PROBE_REQUEST: return "ProbeRequest"; break;
         case ST_PROBE_RESPONSE: return "ProbeResponse"; break;
         case ST_BEACON: return "Beacon"; break;
         case ST_ATIM: return "Atim"; break;
         case ST_DISASSOC: return "Disassociation"; break;
         case ST_AUTH: return "Authentication"; break;
         case ST_DEAUTH: return "Deathentication"; break;
         default: owarn << "OWaveLanManagementPacket::managementType(): unhandled subtype " << FC_SUBTYPE( EXTRACT_LE_16BITS( &_header->fc ) ) << oendl; return "Unknown";
     }
 }
 
 
 int OWaveLanManagementPacket::beaconInterval() const
 {
     return EXTRACT_LE_16BITS( &_body->beacon_interval );
 }
 
 
 int OWaveLanManagementPacket::capabilities() const
 {
     return EXTRACT_LE_16BITS( &_body->capability_info );
 }
 
 
 bool OWaveLanManagementPacket::canESS() const
 {
     return CAPABILITY_ESS( EXTRACT_LE_16BITS( &_body->capability_info ) );
 }
 
 
 bool OWaveLanManagementPacket::canIBSS() const
 {
     return CAPABILITY_IBSS( EXTRACT_LE_16BITS( &_body->capability_info ) );
 }
 
 
 bool OWaveLanManagementPacket::canCFP() const
 {
     return CAPABILITY_CFP( EXTRACT_LE_16BITS( &_body->capability_info ) );
 }
 
 
 bool OWaveLanManagementPacket::canCFP_REQ() const
 {
     return CAPABILITY_CFP_REQ( EXTRACT_LE_16BITS( &_body->capability_info ) );
 }
 
 
 bool OWaveLanManagementPacket::canPrivacy() const
 {
     return CAPABILITY_PRIVACY( EXTRACT_LE_16BITS( &_body->capability_info ) );
 }
 
 
 /*======================================================================================
  * OWaveLanManagementSSID
  *======================================================================================*/
 
 OWaveLanManagementSSID::OWaveLanManagementSSID( const unsigned char* end, const struct ssid_t* data, QObject* parent )
                 :QObject( parent, "802.11 SSID" ), _data( data )
 {
     odebug << "OWaveLanManagementSSID()" << oendl;
 }
 
 
 OWaveLanManagementSSID::~OWaveLanManagementSSID()
 {
 }
 
 
 QString OWaveLanManagementSSID::ID( bool decloak ) const
 {
     int length = _data->length;
     if ( length > 32 ) length = 32;
     char essid[length+1];
     memcpy( &essid, &_data->ssid, length );
     essid[length] = 0x0;
     if ( !decloak || length < 2 || essid[0] != '\0' ) return essid;
     odebug << "OWaveLanManagementSSID:ID(): SSID is cloaked - decloaking..." << oendl;
 
     QString decloakedID;
     for ( int i = 1; i < length; ++i )
     {
         if ( essid[i] >= 32 && essid[i] <= 126 ) decloakedID.append( essid[i] );
         else decloakedID.append( '.' );
     }
     return decloakedID;
 }
 
 
 /*======================================================================================
  * OWaveLanManagementRates
  *======================================================================================*/
 
 OWaveLanManagementRates::OWaveLanManagementRates( const unsigned char* end, const struct rates_t* data, QObject* parent )
                 :QObject( parent, "802.11 Rates" ), _data( data )
 {
     odebug << "OWaveLanManagementRates()" << oendl;
 }
 
 
 OWaveLanManagementRates::~OWaveLanManagementRates()
 {
 }
 
 /*======================================================================================
  * OWaveLanManagementCF
  *======================================================================================*/
 
 OWaveLanManagementCF::OWaveLanManagementCF( const unsigned char* end, const struct cf_t* data, QObject* parent )
                 :QObject( parent, "802.11 CF" ), _data( data )
 {
     odebug << "OWaveLanManagementCF()" << oendl;
 }
 
 
 OWaveLanManagementCF::~OWaveLanManagementCF()
 {
 }
 
 /*======================================================================================
  * OWaveLanManagementFH
  *======================================================================================*/
 
 OWaveLanManagementFH::OWaveLanManagementFH( const unsigned char* end, const struct fh_t* data, QObject* parent )
                 :QObject( parent, "802.11 FH" ), _data( data )
 {
     odebug << "OWaveLanManagementFH()" << oendl;
 }
 
 
 OWaveLanManagementFH::~OWaveLanManagementFH()
 {
 }
 
 /*======================================================================================
  * OWaveLanManagementDS
  *======================================================================================*/
 
 OWaveLanManagementDS::OWaveLanManagementDS( const unsigned char* end, const struct ds_t* data, QObject* parent )
                 :QObject( parent, "802.11 DS" ), _data( data )
 {
     odebug << "OWaveLanManagementDS()" << oendl;
 }
 
 
 OWaveLanManagementDS::~OWaveLanManagementDS()
 {
 }
 
 
 int OWaveLanManagementDS::channel() const
 {
     return _data->channel;
 }
 
 /*======================================================================================
  * OWaveLanManagementTim
  *======================================================================================*/
 
 OWaveLanManagementTim::OWaveLanManagementTim( const unsigned char* end, const struct tim_t* data, QObject* parent )
                 :QObject( parent, "802.11 Tim" ), _data( data )
 {
     odebug << "OWaveLanManagementTim()" << oendl;
 }
 
 
 OWaveLanManagementTim::~OWaveLanManagementTim()
 {
 }
 
 /*======================================================================================
  * OWaveLanManagementIBSS
  *======================================================================================*/
 
 OWaveLanManagementIBSS::OWaveLanManagementIBSS( const unsigned char* end, const struct ibss_t* data, QObject* parent )
                 :QObject( parent, "802.11 IBSS" ), _data( data )
 {
     odebug << "OWaveLanManagementIBSS()" << oendl;
 }
 
 
 OWaveLanManagementIBSS::~OWaveLanManagementIBSS()
 {
 }
 
 /*======================================================================================
  * OWaveLanManagementChallenge
  *======================================================================================*/
 
 OWaveLanManagementChallenge::OWaveLanManagementChallenge( const unsigned char* end, const struct challenge_t* data, QObject* parent )
                 :QObject( parent, "802.11 Challenge" ), _data( data )
 {
     odebug << "OWaveLanManagementChallenge()" << oendl;
 }
 
 
 OWaveLanManagementChallenge::~OWaveLanManagementChallenge()
 {
 }
 
 /*======================================================================================
  * OWaveLanDataPacket
  *======================================================================================*/
 
 OWaveLanDataPacket::OWaveLanDataPacket( const unsigned char* end, const struct ieee_802_11_data_header* data, OWaveLanPacket* parent )
                 :QObject( parent, "802.11 Data" ), _header( data )
 {
     odebug << "OWaveLanDataPacket::OWaveLanDataPacket(): decoding frame..." << oendl;
 
     const unsigned char* payload = (const unsigned char*) data + sizeof( struct ieee_802_11_data_header );
 
     #warning The next line works for most cases, but can not be correct generally!
     if (!( ( (OWaveLanPacket*) this->parent())->duration() )) payload -= 6; // compensation for missing last address
 
     new OLLCPacket( end, (const struct ieee_802_11_802_2_header*) payload, this );
 }
 
 
 OWaveLanDataPacket::~OWaveLanDataPacket()
 {
 }
 
 
 /*======================================================================================
  * OLLCPacket
  *======================================================================================*/
 
 OLLCPacket::OLLCPacket( const unsigned char* end, const struct ieee_802_11_802_2_header* data, QObject* parent )
            :QObject( parent, "802.11 LLC" ), _header( data )
 {
     odebug << "OLLCPacket::OLLCPacket(): decoding frame..." << oendl;
 
     if ( !(_header->oui[0] || _header->oui[1] || _header->oui[2]) )
     {
         owarn << "OLLCPacket::OLLCPacket(): contains an encapsulated Ethernet frame (type = " << EXTRACT_16BITS( &_header->type ) << ")" << oendl;
 
         switch ( EXTRACT_16BITS( &_header->type ) ) // defined in linux/if_ether.h
         {
             case ETH_P_IP: new OIPPacket( end, (const struct iphdr*) (data+1), this ); break;
             case ETH_P_ARP: new OARPPacket( end, (const struct myarphdr*) (data+1), this ); break;
             default: owarn << "OLLCPacket::OLLCPacket(): Unknown Encapsulation type = " << EXTRACT_16BITS( &_header->type ) << oendl;
         }
     }
 }
 
 
 OLLCPacket::~OLLCPacket()
 {
 }
 
 
 /*======================================================================================
  * OWaveLanControlPacket
  *======================================================================================*/
 
 OWaveLanControlPacket::OWaveLanControlPacket( const unsigned char* end, const struct ieee_802_11_control_header* data, OWaveLanPacket* parent )
                       :QObject( parent, "802.11 Control" ), _header( data )
 {
     odebug << "OWaveLanControlPacket::OWaveLanDataControl(): decoding frame..." << oendl;
     odebug << "Detected subtype is " << controlType() << oendl;
 }
 
 
 OWaveLanControlPacket::~OWaveLanControlPacket()
 {
 }
 
 
 QString OWaveLanControlPacket::controlType() const
 {
     switch ( FC_SUBTYPE( EXTRACT_LE_16BITS( &_header->fc ) ) )
     {
         case CTRL_PS_POLL: return "PowerSavePoll"; break;
         case CTRL_RTS: return "RequestToSend"; break;
         case CTRL_CTS: return "ClearToSend"; break;
         case CTRL_ACK: return "Acknowledge"; break;
         case CTRL_CF_END: return "ContentionFreeEnd"; break;
         case CTRL_END_ACK: return "AcknowledgeEnd"; break;
         default:
             owarn << "OWaveLanControlPacket::managementType(): unhandled subtype " << FC_SUBTYPE( EXTRACT_LE_16BITS( &_header->fc ) ) << oendl;
             return "Unknown";
     }
 }
 
 
 /*======================================================================================
  * OPacketCapturer
  *======================================================================================*/
 
 OPacketCapturer::OPacketCapturer( QObject* parent, const char* name )
                 :QObject( parent, name ), _name( QString::null ), _open( false ), _pch( 0 ), _pcd( 0 ), _sn( 0 )
 {
 }
 
 
 OPacketCapturer::~OPacketCapturer()
 {
     if ( _open )
     {
         odebug << "OPacketCapturer::~OPacketCapturer(): pcap still open, autoclosing." << oendl;
         close();
     }
 }
 
 
 void OPacketCapturer::setBlocking( bool b )
 {
     if ( pcap_setnonblock( _pch, 1-b, _errbuf ) != -1 )
     {
         odebug << "OPacketCapturer::setBlocking(): blocking mode changed successfully." << oendl;
     }
     else
     {
         odebug << "OPacketCapturer::setBlocking(): can't change blocking mode: " << _errbuf << oendl;
     }
 }
 
 
 bool OPacketCapturer::blocking() const
 {
     int b = pcap_getnonblock( _pch, _errbuf );
     if ( b == -1 )
     {
         odebug << "OPacketCapturer::blocking(): can't get blocking mode: " << _errbuf << oendl;
         return -1;
     }
     return !b;
 }
 
 
 void OPacketCapturer::closeDumpFile()
 {
     if ( _pcd )
     {
         pcap_dump_close( _pcd );
         _pcd = 0;
     }
     pcap_close( _pch );
 }
 
 
 void OPacketCapturer::close()
 {
     if ( _open )
     {
         if ( _sn )
         {
             _sn->disconnect( SIGNAL( activated(int) ), this, SLOT( readyToReceive() ) );
             delete _sn;
         }
         closeDumpFile();