copy data handed over by libpcap because libpcap reuses the data area

1 files changed, 21 insertions, 18 deletions

diff --git a/libopie2/opienet/opcap.cpp b/libopie2/opienet/opcap.cpp
index 93176c0..067d6b7 100644
--- a/libopie2/opienet/opcap.cpp
+++ b/libopie2/opienet/opcap.cpp
@@ -1,860 +1,863 @@
 /*
                              This file is part of the Opie Project
-                             Copyright (C) 2003 by Michael 'Mickey' Lauer <mickey@Vanille.de>
+                             Copyright (C) 2003-2004 by Michael 'Mickey' Lauer <mickey@Vanille.de>
               =.
             .=l.
            .>+-=
  _;:,     .>    :=|.         This program is free software; you can
 .> <`_,   >  .   <=          redistribute it and/or  modify it under
 :`=1 )Y*s>-.--   :           the terms of the GNU Library General Public
 .="- .-=="i,     .._         License as published by the Free Software
  - .   .-<_>     .<>         Foundation; either version 2 of the License,
      ._= =}       :          or (at your option) any later version.
     .%`+i>       _;_.
     .i_,=:_.      -<s.       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
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 
 */
 
+#include "udp_ports.h"
+#include "opcap.h"
+
 /* OPIE */
-#include <opie2/opcap.h>
 #include <opie2/odebug.h>
+using namespace Opie::Core;
 
 /* QT */
 #include <qapplication.h> // don't use oapplication here (will decrease reusability in other projects)
 #include <qsocketnotifier.h>
 #include <qobjectlist.h>
 
-/* SYSTEM */
+/* STD */
 #include <sys/time.h>
 #include <sys/types.h>
+#include <assert.h>
 #include <unistd.h>
-
-/* LOCAL */
-#include "udp_ports.h"
-
-using namespace Opie::Core;
+#include <string.h>
 
 namespace Opie {
 namespace Net  {
 
 /*======================================================================================
  * OPacket
  *======================================================================================*/
 
 OPacket::OPacket( int datalink, packetheaderstruct header, const unsigned char* data, QObject* parent )
-        :QObject( parent, "Generic" ), _hdr( header ), _data( data )
+        :QObject( parent, "Generic" ), _hdr( header ), _data( 0 )
 {
-    //FIXME: Copy the data structure here, because it isn't persistent. Check that.
-    
-    qDebug( "OPacket::OPacket(): (Len %d, CapLen %d)" /*, ctime((const time_t*) header.ts.tv_sec)*/, header.len, header.caplen );
 
-    _end = (unsigned char*) data + header.len;
-    //qDebug( "OPacket::data @ %0x, end @ %0x", data, _end );
+    _data = new unsigned char[sizeof data];
+    assert( _data );
+    memcpy( const_cast<unsigned char*>(_data), data, sizeof data );
+    // We have to copy the data structure here, because the 'data' pointer handed by libpcap
+    // points to an internal region which is reused by lipcap.
+    odebug << "OPacket: Length = " << header.len << ", Caplen = " << header.caplen << oendl;
+    _end = (unsigned char*) _data + header.len;
 
     switch ( datalink )
     {
         case DLT_EN10MB:
             odebug << "OPacket::OPacket(): Received Packet. Datalink = ETHERNET" << oendl;
-            new OEthernetPacket( _end, (const struct ether_header*) data, this );
+            new OEthernetPacket( _end, (const struct ether_header*) _data, this );
             break;
 
         case DLT_IEEE802_11:
             odebug << "OPacket::OPacket(): Received Packet. Datalink = IEEE802.11" << oendl;
-            new OWaveLanPacket( _end, (const struct ieee_802_11_header*) data, this );
+            new OWaveLanPacket( _end, (const struct ieee_802_11_header*) _data, this );
             break;
 
         case DLT_PRISM_HEADER:
             odebug << "OPacket::OPacket(): Received Packet. Datalink = PRISM_HEADER" << oendl;
-            new OPrismHeaderPacket( _end, (const struct prism_hdr*) (unsigned char*) data, this );
+            new OPrismHeaderPacket( _end, (const struct prism_hdr*) (unsigned char*) _data, this );
             break;
 
         default:
             owarn << "OPacket::OPacket(): Received Packet over unsupported datalink, type " << datalink << "!" << oendl;
     }
 }
 
 
 OPacket::~OPacket()
 {
-    qDebug( "OPacket::~OPacket( %s )", name() );
+    odebug << "~OPacket( " << name() << " )" << oendl;
+    delete _data;
 }
 
 
 timevalstruct OPacket::timeval() const
 {
     return _hdr.ts;
 }
 
 
 int OPacket::caplen() const
 {
     return _hdr.caplen;
 }
 
 
 void OPacket::updateStats( QMap<QString,int>& stats, QObjectList* l )
 {
     if (!l) return;
     QObject* o = l->first();
     while ( o )
     {
         stats[o->name()]++;
         updateStats( stats, const_cast<QObjectList*>( o->children() ) );
         o = l->next();
     }
 }
 
 
 QString OPacket::dumpStructure() const
 {
     return "[ |" + _dumpStructure(  const_cast<QObjectList*>( this->children() ) ) + " ]";
 }
 
 
 QString OPacket::_dumpStructure( QObjectList* l ) const
 {
     if (!l) return QString::null;
     QObject* o = l->first();
     QString str(" ");
 
     while ( o )
     {
         str.append( o->name() );
         str.append( " |" );
         str += _dumpStructure( const_cast<QObjectList*>( o->children() ) );
         o = l->next();
     }
     return str;
 }
 
 QString OPacket::dump( int bpl ) const
 {
     static int index = 0;
     index++;
     int len = _hdr.caplen;
     QString str;
     str.sprintf( "\n<----- Packet #%04d Len = 0x%X (%d) ----->\n\n", index, len, len );
     str.append( "0000: " );
     QString tmp;
     QString bytes;
     QString chars;
 
     for ( int i = 0; i < len; ++i )
     {
         tmp.sprintf( "%02X ", _data[i] ); bytes.append( tmp );
         if ( (_data[i] > 31) && (_data[i]<128) ) chars.append( _data[i] );
         else chars.append( '.' );
 
         if ( !((i+1) % bpl) )
         {
             str.append( bytes );
             str.append( ' ' );
             str.append( chars );
             str.append( '\n' );
             tmp.sprintf( "%04X: ", i+1 ); str.append( tmp );
             bytes = "";
             chars = "";
         }
 
     }
     if ( (len % bpl) )
     {
         str.append( bytes.leftJustify( 1 + 3*bpl ) );
         str.append( chars );
     }
     str.append( '\n' );
     return str;
 }
 
 
 int OPacket::len() const
 {
     return _hdr.len;
 }
 
 
 QTextStream& operator<<( QTextStream& s, const OPacket& p )
 {
     s << p.dumpStructure();
 }
 
 
 /*======================================================================================
  * OEthernetPacket
  *======================================================================================*/
 
 OEthernetPacket::OEthernetPacket( const unsigned char* end, const struct ether_header* data, QObject* parent )
                 :QObject( parent, "Ethernet" ), _ether( data )
 {
 
     odebug << "Source = " << sourceAddress().toString();
     odebug << "Destination = " << destinationAddress().toString();
 
     if ( sourceAddress() == OMacAddress::broadcast )
         odebug << "Source is broadcast address" << oendl;
     if ( destinationAddress() == OMacAddress::broadcast )
         odebug << "Destination is broadcast address" << oendl;
 
     switch ( type() )
     {
         case ETHERTYPE_IP: new OIPPacket( end, (const struct iphdr*) (data+1), this ); break;
         case ETHERTYPE_ARP: new OARPPacket( end, (const struct myarphdr*) (data+1), this ); break;
         case ETHERTYPE_REVARP: { odebug << "OPacket::OPacket(): Received Ethernet Packet : Type = RARP" << oendl; break; }
         default: odebug << "OPacket::OPacket(): Received Ethernet Packet : Type = UNKNOWN" << oendl;
     }
 
 }
 
 
 OEthernetPacket::~OEthernetPacket()
 {
 }
 
 
 OMacAddress OEthernetPacket::sourceAddress() const
 {
     return OMacAddress( _ether->ether_shost );
 }
 
 
 OMacAddress OEthernetPacket::destinationAddress() const
 {
     return OMacAddress( _ether->ether_dhost );
 }
 
 int OEthernetPacket::type() const
 {
     return ntohs( _ether->ether_type );
 }
 
 
 /*======================================================================================
  * OIPPacket
  *======================================================================================*/
 
 
 OIPPacket::OIPPacket( const unsigned char* end, const struct iphdr* data, QObject* parent )
           :QObject( parent, "IP" ), _iphdr( data )
 {
     odebug << "OIPPacket::OIPPacket(): decoding IP header..." << oendl;
 
     odebug << "FromAddress = " << fromIPAddress().toString() << oendl;
     odebug << "  toAddress = " << toIPAddress().toString() << oendl;
 
     switch ( protocol() )
     {
         case IPPROTO_UDP: new OUDPPacket( end, (const struct udphdr*) (data+1), this ); break;
         case IPPROTO_TCP: new OTCPPacket( end, (const struct tcphdr*) (data+1), this ); break;
         default: odebug << "OIPPacket::OIPPacket(): unknown IP protocol, type = " << protocol() << oendl;
     }
 
 }
 
 OIPPacket::~OIPPacket()
 {
 }
 
 
 QHostAddress OIPPacket::fromIPAddress() const
 {
     return EXTRACT_32BITS( &_iphdr->saddr );
 }
 
 
 QHostAddress OIPPacket::toIPAddress() const
 {
     return EXTRACT_32BITS( &_iphdr->saddr );
 }
 
 
 int OIPPacket::tos() const
 {
     return _iphdr->tos;
 }
 
 
 int OIPPacket::len() const
 {
     return EXTRACT_16BITS( &_iphdr->tot_len );
 }
 
 
 int OIPPacket::id() const
 {
     return EXTRACT_16BITS( &_iphdr->id );
 }
 
 
 int OIPPacket::offset() const
 {
     return EXTRACT_16BITS( &_iphdr->frag_off );
 }
 
 
 int OIPPacket::ttl() const
 {
     return _iphdr->ttl;
 }
 
 
 int OIPPacket::protocol() const
 {
     return _iphdr->protocol;
 }
 
 
 int OIPPacket::checksum() const
 {
     return EXTRACT_16BITS( &_iphdr->check );
 }
 
 /*======================================================================================
  * OARPPacket
  *======================================================================================*/
 
 
 OARPPacket::OARPPacket( const unsigned char* end, const struct myarphdr* data, QObject* parent )
            :QObject( parent, "ARP" ), _arphdr( data )
 {
     odebug << "OARPPacket::OARPPacket(): decoding ARP header..." << oendl;
     odebug << "ARP type seems to be " << EXTRACT_16BITS( &_arphdr->ar_op ) << " = " << type() << oendl;
     odebug << "Sender: MAC " << senderMacAddress().toString() << " = IP " << senderIPV4Address().toString() << oendl;
     odebug << "Target: MAC " << targetMacAddress().toString() << " = IP " << targetIPV4Address().toString() << oendl;
 }
 
 
 OARPPacket::~OARPPacket()
 {
 }
 
 
 QString OARPPacket::type() const
 {
     switch ( EXTRACT_16BITS( &_arphdr->ar_op ) )
     {
         case 1: return "REQUEST";
         case 2: return "REPLY";
         case 3: return "RREQUEST";
         case 4: return "RREPLY";
         case 8: return "InREQUEST";
         case 9: return "InREPLY";
         case 10: return "NAK";
         default: owarn << "OARPPacket::type(): invalid ARP type!" << oendl; return "<unknown>";
     }
 }
 
 
 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.
     // 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 )
     {