OPacketCapturer API addition: setAutoDelete() and autoDelete()

2 files changed, 33 insertions, 8 deletions

diff --git a/libopie2/opienet/opcap.cpp b/libopie2/opienet/opcap.cpp
index 4081d4f..c5df041 100644
--- a/libopie2/opienet/opcap.cpp
+++ b/libopie2/opienet/opcap.cpp
@@ -1,185 +1,186 @@
 /*
                              This file is part of the Opie Project
                              Copyright (C) 2003 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.
 
 */
 
 /* OPIE */
 #include <opie2/opcap.h>
 #include <opie2/odebug.h>
 
 /* QT */
 #include <qapplication.h> // don't use oapplication here (will decrease reusability in other projects)
 #include <qsocketnotifier.h>
 #include <qobjectlist.h>
 
 /* SYSTEM */
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 /* LOCAL */
 #include "udp_ports.h"
 
 using namespace Opie::Core;
 
 namespace Opie {
 namespace Net  {
 
 /*======================================================================================
  * OPacket
  *======================================================================================*/
 
 OPacket::OPacket( int datalink, packetheaderstruct header, const unsigned char* data, QObject* parent )
         :QObject( parent, "Generic" ), _hdr( header ), _data( data )
 {
-    //qDebug( "OPacket::OPacket(): (Len %d, CapLen %d)" /*, ctime((const time_t*) header.ts.tv_sec)*/, header.len, header.caplen );
+    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 );
 
     switch ( datalink )
     {
         case DLT_EN10MB:
             odebug << "OPacket::OPacket(): Received Packet. Datalink = ETHERNET" << oendl;
             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 );
             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 );
             break;
 
         default:
             owarn << "OPacket::OPacket(): Received Packet over unsupported datalink, type " << datalink << "!" << oendl;
     }
 }
 
 
 OPacket::~OPacket()
 {
+    qDebug( "OPacket::~OPacket( %s )", name() );
 }
 
 
 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;
 }
 
 
@@ -970,207 +971,219 @@ OWaveLanManagementChallenge::OWaveLanManagementChallenge( const unsigned char* e
 
 
 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 )
+                :QObject( parent, name ), _name( QString::null ), _open( false ), _pch( 0 ), _pcd( 0 ), _sn( 0 ), _autodelete( true )
 {
 }
 
 
 OPacketCapturer::~OPacketCapturer()
 {
     if ( _open )
     {
         odebug << "OPacketCapturer::~OPacketCapturer(): pcap still open, autoclosing." << oendl;
         close();
     }
 }
 
 
+void OPacketCapturer::setAutoDelete( bool b )
+{
+    _autodelete = b;
+}
+
+
+bool OPacketCapturer::autoDelete() const
+{
+    return _autodelete;
+}
+
+
 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();
     _open = false;
     }
 
     odebug << "OPacketCapturer::close() --- dumping capturing statistics..." << oendl;
     odebug << "--------------------------------------------------" << oendl;
     for( QMap<QString,int>::Iterator it = _stats.begin(); it != _stats.end(); ++it )
         odebug << it.key() << " = " << it.data() << oendl;
     odebug << "--------------------------------------------------" << oendl;
 
 }
 
 
 int OPacketCapturer::dataLink() const
 {
     return pcap_datalink( _pch );
 }
 
 
 void OPacketCapturer::dump( OPacket* p )
 {
     if ( !_pcd )
     {
         owarn << "OPacketCapturer::dump() - cannot dump without open capture file!" << oendl;
         return;
     }
     pcap_dump( (u_char*) _pcd, &p->_hdr, p->_data );
 }
 
 
 int OPacketCapturer::fileno() const
 {
     if ( _open )
     {
         return pcap_fileno( _pch );
     }
     else
     {
         return -1;
     }
 }
 
 
 OPacket* OPacketCapturer::next( int time )
 {
     fd_set fds;
     struct timeval tv;
     FD_ZERO( &fds );
     FD_SET( pcap_fileno( _pch ), &fds );
     tv.tv_sec = time / 1000;
     tv.tv_usec = time % 1000;
@@ -1228,126 +1241,126 @@ bool OPacketCapturer::open( const QString& name )
     // open libpcap
     pcap_t* handle = pcap_open_live( const_cast<char*>( (const char*) name ), 1024, 0, 0, &_errbuf[0] );
 
     if ( !handle )
     {
         owarn << "OPacketCapturer::open(): can't open libpcap with '" << name << "': " << _errbuf << oendl;
         return false;
     }
 
     odebug << "OPacketCapturer::open(): libpcap [" << name << "] opened successfully." << oendl;
     _pch = handle;
     _open = true;
     _stats.clear();
 
     // in case we have an application object, create a socket notifier
     if ( qApp ) //TODO: I don't like this here...
     {
         _sn = new QSocketNotifier( fileno(), QSocketNotifier::Read );
         connect( _sn, SIGNAL( activated(int) ), this, SLOT( readyToReceive() ) );
     }
 
     return true;
 }
 
 
 bool OPacketCapturer::openDumpFile( const QString& filename )
 {
     pcap_dumper_t* dump = pcap_dump_open( _pch, const_cast<char*>( (const char*) filename ) );
     if ( !dump )
     {
         owarn << "OPacketCapturer::open(): can't open dump with '" << filename << "': " << _errbuf << oendl;
         return false;
     }
     odebug << "OPacketCapturer::open(): dump [" << filename << "] opened successfully." << oendl;
     _pcd = dump;
 
     return true;
 }
 
 
 bool OPacketCapturer::open( const QFile& file )
 {
     QString name = file.name();
 
     if ( _open )
     {
         close();
         if ( name == _name )    // ignore opening an already openend device
         {
             return true;
         }
         else                    // close the last opened device
         {
             close();
         }
     }
 
     _name = name;
 
     pcap_t* handle = pcap_open_offline( const_cast<char*>( (const char*) name ), &_errbuf[0] );
 
     if ( handle )
     {
         odebug << "OPacketCapturer::open(): libpcap opened successfully." << oendl;
         _pch = handle;
         _open = true;
 
         // in case we have an application object, create a socket notifier
         if ( qApp )
         {
             _sn = new QSocketNotifier( fileno(), QSocketNotifier::Read );
             connect( _sn, SIGNAL( activated(int) ), this, SLOT( readyToReceive() ) );
         }
 
         return true;
     }
     else
     {
         odebug << "OPacketCapturer::open(): can't open libpcap with '" << name << "': " << _errbuf << oendl;
         return false;
     }
 
 }
 
 
 bool OPacketCapturer::isOpen() const
 {
     return _open;
 }
 
 
 void OPacketCapturer::readyToReceive()
 {
     odebug << "OPacketCapturer::readyToReceive(): about to emit 'receivePacket(p)'" << oendl;
     OPacket* p = next();
     emit receivedPacket( p );
-    // emit is synchronous - packet has been dealt with, now it's safe to delete
-    delete p;
+    // emit is synchronous - packet has been dealt with, now it's safe to delete (if enabled)
+    if ( _autodelete ) delete p;
 }
 
 
 const QMap<QString,int>& OPacketCapturer::statistics() const
 {
     return _stats;
 }
 
 
 int OPacketCapturer::snapShot() const
 {
     return pcap_snapshot( _pch );
 }
 
 
 bool OPacketCapturer::swapped() const
 {
     return pcap_is_swapped( _pch );
 }
 
 
 QString OPacketCapturer::version() const
 {
     return QString().sprintf( "%d.%d", pcap_major_version( _pch ), pcap_minor_version( _pch ) );
 }
 
 }
 }
diff --git a/libopie2/opienet/opcap.h b/libopie2/opienet/opcap.h
index 72a78de..4ff8495 100644
--- a/libopie2/opienet/opcap.h
+++ b/libopie2/opienet/opcap.h
@@ -41,195 +41,194 @@
 #include <qobject.h>
 #include <qstring.h>
 #include <qtextstream.h>
 #include <qmap.h>
 
 /* STD */
 extern "C"  // work around a bpf/pcap conflict in recent headers
 {
     #include <pcap.h>
 }
 #include <netinet/ether.h>
 #include <netinet/ip.h>
 #include <netinet/udp.h>
 #include <netinet/tcp.h>
 #include <time.h>
 
 /* Custom Network Includes (must go here, don't reorder!) */
 #include "802_11_user.h"
 #include "dhcp.h"
 
 
 /* TYPEDEFS */
 typedef struct timeval timevalstruct;
 typedef struct pcap_pkthdr packetheaderstruct;
 
 /* FORWARDS */
 class QSocketNotifier;
 namespace Opie {
 namespace Net  {
 class OPacketCapturer;
 
 /*======================================================================================
  * OPacket - A frame on the wire
  *======================================================================================*/
 
 /** @brief A class representing a data frame on the wire.
  *
  * The whole family of the packet classes are used when capturing frames from a network.
  * Most standard network protocols in use share a common architecture, which mostly is
  * a packet header and then the packet payload. In layered architectures, each lower layer
  * encapsulates data from its upper layer - that is it
  * treats the data from its upper layer as payload and prepends an own header to the packet,
  * which - again - is treated as the payload for the layer below. The figure below is an
  * example for how such a data frame is composed out of packets, e.g. when sending a mail.
  *
  * <pre>
  *                                                       | User Data |     == Mail Data
  *                                         | SMTP Header | User Data |     == SMTP
  *                           | TCP Header  | SMTP Header | User Data |     == TCP
  *               | IP Header | TCP Header  | SMTP Header | User Data |     == IP
  *  | MAC Header | IP Header | TCP Header  | SMTP Header | User Data |     == MAC
  *
  * </pre>
  *
  * The example is trimmed for simplicity, because the MAC (Medium Access Control) layer
  * also contains a few more levels of encapsulation.
  * Since the type of the payload is more or less independent from the encapsulating protocol,
  * the header must be inspected before attempting to decode the payload. Hence, the
  * encapsulation level varies and can't be deduced without actually looking into the packets.
  *
  * For actually working with captured frames, it's useful to identify the packets via names and
  * insert them into a parent/child - relationship based on the encapsulation. This is why
  * all packet classes derive from QObject. The amount of overhead caused by the QObject is
  * not a problem in this case, because we're talking about a theoratical maximum of about
  * 10 packets per captured frame. We need to stuff them into a searchable list anyway and the
  * QObject also cares about destroying the sub-, (child-) packets.
  *
  * This enables us to perform a simple look for packets of a certain type:
  * @code
  * OPacketCapturer* pcap = new OPacketCapturer();
  * pcap->open( "eth0" );
  * OPacket* p = pcap->next();
  * OIPPacket* ip = (OIPPacket*) p->child( "IP" ); // returns 0, if no such child exists
  * odebug << "got ip packet from " << ip->fromIPAddress().toString() << " to " << ip->toIPAddress().toString() << oendl;
  *
  */
 
 class OPacket : public QObject
 {
   Q_OBJECT
 
   friend class OPacketCapturer;
   friend QTextStream& operator<<( QTextStream& s, const OPacket& p );
 
   public:
     OPacket( int datalink, packetheaderstruct, const unsigned char*, QObject* parent );
     virtual ~OPacket();
 
     timevalstruct timeval() const;
 
     int caplen() const;
     int len() const;
     QString dump( int = 32 ) const;
 
     void updateStats( QMap<QString,int>&, QObjectList* );
 
-  private:
-
     QString dumpStructure() const;
+  private:
     QString _dumpStructure( QObjectList* ) const;
 
   private:
     const packetheaderstruct _hdr;  // pcap packet header
     const unsigned char* _data;     // pcap packet data
     const unsigned char* _end;      // end of pcap packet data
   private:
     class Private;
     Private *d;
 };
 
 QTextStream& operator<<( QTextStream& s, const OPacket& p );
 
 /*======================================================================================
  * OEthernetPacket - DLT_EN10MB frame
  *======================================================================================*/
 
 class OEthernetPacket : public QObject
 {
   Q_OBJECT
 
   public:
     OEthernetPacket( const unsigned char*, const struct ether_header*, QObject* parent = 0 );
     virtual ~OEthernetPacket();
 
     OMacAddress sourceAddress() const;
     OMacAddress destinationAddress() const;
     int type() const;
 
   private:
     const struct ether_header* _ether;
   private:
     class Private;
     Private *d;
 };
 
 /*======================================================================================
  * OPrismHeaderPacket - DLT_PRISM_HEADER frame
  *======================================================================================*/
 
 class OPrismHeaderPacket : public QObject
 {
   Q_OBJECT
 
   public:
     OPrismHeaderPacket( const unsigned char*, const struct prism_hdr*, QObject* parent = 0 );
     virtual ~OPrismHeaderPacket();
 
     unsigned int signalStrength() const;
 
   private:
     const struct prism_hdr* _header;
     class Private;
     Private *d;
 };
 
 /*======================================================================================
  * OWaveLanPacket - DLT_IEEE802_11 frame
  *======================================================================================*/
 
 class OWaveLanPacket : public QObject
 {
   Q_OBJECT
 
   public:
     OWaveLanPacket( const unsigned char*, const struct ieee_802_11_header*, QObject* parent = 0 );
     virtual ~OWaveLanPacket();
 
     int duration() const;
     bool fromDS() const;
     bool toDS() const;
     virtual OMacAddress macAddress1() const;
     virtual OMacAddress macAddress2() const;
     virtual OMacAddress macAddress3() const;
     virtual OMacAddress macAddress4() const;
     bool usesPowerManagement() const;
     int type() const;
     int subType() const;
     int version() const;
     bool usesWep() const;
 
   private:
     const struct ieee_802_11_header* _wlanhdr;
     class Private;
     Private *d;
 };
 
 
 /*======================================================================================
  * OWaveLanManagementPacket - type: management (T_MGMT)
  *======================================================================================*/
 
 class OWaveLanManagementPacket : public QObject
 {
   Q_OBJECT
 
@@ -600,122 +599,135 @@ class OTCPPacket : public QObject
 
 /**
  * @brief A class based wrapper for network packet capturing.
  *
  * This class is the base of a high-level interface to the well known packet capturing
  * library libpcap.
  * @see http://tcpdump.org
  */
 class OPacketCapturer : public QObject
 {
   Q_OBJECT
 
   public:
     /**
      * Constructor.
      */
     OPacketCapturer( QObject* parent = 0, const char* name = 0 );
     /**
      * Destructor.
      */
     ~OPacketCapturer();
     /**
      * Set the packet capturer to use blocking or non-blocking IO. This can be useful when
      * not using the socket notifier, e.g. without an application object.
      */
     void setBlocking( bool );
     /**
      * @returns true if the packet capturer uses blocking IO calls.
      */
     bool blocking() const;
     /**
      * Close the packet capturer. This is automatically done in the destructor.
      */
     void close();
     /**
      * Close the output capture file.
      */
     void closeDumpFile();
     /**
      * @returns the data link type.
      * @see <pcap.h> for possible values.
      */
     int dataLink() const;
     /**
      * Dump a packet to the output capture file.
      */
     void dump( OPacket* );
     /**
      * @returns the file descriptor of the packet capturer. This is only useful, if
      * not using the socket notifier, e.g. without an application object.
      */
     int fileno() const;
     /**
      * @returns the next @ref OPacket from the packet capturer.
      * @note If blocking mode is true then this call might block.
      */
     OPacket* next();
     /**
      * @returns the next @ref OPacket from the packet capturer, if
      * one arrives within @a time milliseconds.
      */
     OPacket* next( int time );
     /**
      * Open the packet capturer to capture packets in live-mode from @a interface.
      */
     bool open( const QString& interface );
     /**
      * Open the packet capturer to capture packets in offline-mode from @a file.
      */
     bool open( const QFile& file );
     /**
      * Open a prerecorded tcpdump compatible capture file for use with @ref dump()
      */
     bool openDumpFile( const QString& filename );
     /**
      * @returns true if the packet capturer is open
      */
     bool isOpen() const;
     /**
      * @returns the snapshot length of this packet capturer
      */
     int snapShot() const;
     /**
      * @returns true if the input capture file has a different byte-order
      * than the byte-order of the running system.
      */
     bool swapped() const;
     /**
      * @returns the libpcap version string used to write the input capture file.
      */
     QString version() const;
     /**
      * @returns the packet statistic database.
      * @see QMap
      */
     const QMap<QString,int>& statistics() const;
+    /**
+     * Enable or disable the auto-delete option.
+     * If auto-delete is enabled, then the packet capturer will delete a packet right
+     * after it has been emit'ted. This is the default, which is useful if the packet
+     * capturer has the only reference to the packets. If you pass the packet for adding
+     * into a collection or do processing after the SLOT, the auto delete must be disabled.
+     */
+    void setAutoDelete( bool enable );
+    /**
+     * @returns the auto-delete value.
+     */
+    bool autoDelete() const;
 
   signals:
     /**
      * This signal is emitted, when a packet has been received.
      */
     void receivedPacket( Opie::Net::OPacket* );
 
   protected slots:
     void readyToReceive();
 
   protected:
     QString _name;                                  // devicename
     bool _open;                                     // check this before doing pcap calls
     pcap_t* _pch;                                   // pcap library handle
     pcap_dumper_t* _pcd;                            // pcap dumper handle
     QSocketNotifier* _sn;                           // socket notifier for main loop
     mutable char _errbuf[PCAP_ERRBUF_SIZE];         // holds error strings from libpcap
     QMap<QString, int> _stats;                      // statistics;
-            class Private;                             // Private Forward declaration
-            Private *d;                                     // if we need to add data
+    bool _autodelete;                               // if we auto delete packets after emit
+    class Private;                                  // Private Forward declaration
+    Private *d;                                     // if we need to add data
 };
 }
 }
 
 #endif // OPCAP_H