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
@@ -36,78 +36,79 @@
 #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();
@@ -1042,63 +1043,75 @@ 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;
 }
 
@@ -1300,50 +1313,50 @@ bool OPacketCapturer::open( const QFile& file )
         }
 
         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
@@ -113,51 +113,50 @@ class OPacketCapturer;
  * 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();
@@ -672,50 +671,63 @@ class OPacketCapturer : public QObject
      */
     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