detect and warn if switching device into monitor mode doesn't work

1 files changed, 6 insertions, 0 deletions

diff --git a/noncore/net/wellenreiter/gui/wellenreiter.cpp b/noncore/net/wellenreiter/gui/wellenreiter.cpp
index e294eb8..d80a6e6 100644
--- a/noncore/net/wellenreiter/gui/wellenreiter.cpp
+++ b/noncore/net/wellenreiter/gui/wellenreiter.cpp
@@ -189,24 +189,30 @@ void Wellenreiter::startStopClicked()
 
         switch ( cardtype )
         {
             case 1: iface->setMonitoring( new OCiscoMonitoringInterface( iface ) ); break;
             case 2: iface->setMonitoring( new OWlanNGMonitoringInterface( iface ) ); break;
             case 3: iface->setMonitoring( new OHostAPMonitoringInterface( iface ) ); break;
             case 4: iface->setMonitoring( new OOrinocoMonitoringInterface( iface ) ); break;
             default: assert( 0 ); // shouldn't happen
         }
 
         iface->setMonitorMode( true );
 
+        if ( !iface->monitorMode() )
+        {
+            QMessageBox::warning( this, "Wellenreiter II", "Can't set device into monitor mode." );
+            return;
+        }
+
         // open pcap and start sniffing
         pcap->open( interface );
 
         if ( !pcap->isOpen() )
         {
             QMessageBox::warning( this, "Wellenreiter II", "Can't open packet capturer:\n" + QString(strerror( errno ) ));
             return;
         }
 
         // set capturer to non-blocking mode
         pcap->setBlocking( false );