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
@@ -1,220 +1,223 @@
 /*
                              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;
     }
 
 }