submit iw_range*2 as argument to SIOCGIWRANGE.length to make it work on newer hostap drivers

let's see if this breaks it at another end again :/

1 files changed, 6 insertions, 8 deletions

diff --git a/libopie2/opienet/onetwork.cpp b/libopie2/opienet/onetwork.cpp
index f4bdbe0..05513f8 100644
--- a/libopie2/opienet/onetwork.cpp
+++ b/libopie2/opienet/onetwork.cpp
@@ -508,124 +508,122 @@ void OWirelessNetworkInterface::setAssociatedAP( const OMacAddress& mac ) const
 
 
 OMacAddress OWirelessNetworkInterface::associatedAP() const
 {
     if ( ioctl( SIOCGIWAP ) )
         return (const unsigned char*) &_ifr.ifr_hwaddr.sa_data[0];
     else
         return OMacAddress::unknown;
 }
 
 
 void OWirelessNetworkInterface::buildInformation()
 {
     //ML: If you listen carefully enough, you can hear lots of WLAN drivers suck
     //ML: The HostAP drivers need more than sizeof struct_iw range to complete
     //ML: SIOCGIWRANGE otherwise they fail with "Invalid Argument Length".
     //ML: The Wlan-NG drivers on the otherside fail (segfault!) if you allocate
     //ML: _too much_ space. This is damn shitty crap *sigh*
     //ML: We allocate a large memory region in RAM and check whether the
     //ML: driver pollutes this extra space. The complaint will be made on stdout,
     //ML: so please forward this...
 
     struct iwreq wrq;
     int len = sizeof( struct iw_range )*2;
-    char *buffer = (char*) malloc( len );
-    //FIXME: Validate if we actually got the memory block
+    char buffer[len];
     memset( buffer, 0, len );
     memcpy( wrq.ifr_name, name(), IFNAMSIZ);
     wrq.u.data.pointer = (caddr_t) buffer;
-    wrq.u.data.length = sizeof( struct iw_range );
+    wrq.u.data.length = sizeof buffer;
     wrq.u.data.flags = 0;
 
     if ( ::ioctl( _sfd, SIOCGIWRANGE, &wrq ) == -1 )
     {
-        owarn << "OWirelessNetworkInterface::buildInformation(): Can't get channel information - using default values." << oendl;
+        owarn << "OWirelessNetworkInterface::buildInformation(): Can't get driver information (" << strerror( errno ) << ") - using default values." << oendl;
         _channels.insert( 2412,  1 ); // 2.412 GHz
         _channels.insert( 2417,  2 ); // 2.417 GHz
         _channels.insert( 2422,  3 ); // 2.422 GHz
         _channels.insert( 2427,  4 ); // 2.427 GHz
         _channels.insert( 2432,  5 ); // 2.432 GHz
         _channels.insert( 2437,  6 ); // 2.437 GHz
         _channels.insert( 2442,  7 ); // 2.442 GHz
         _channels.insert( 2447,  8 ); // 2.447 GHz
         _channels.insert( 2452,  9 ); // 2.452 GHz
         _channels.insert( 2457, 10 ); // 2.457 GHz
         _channels.insert( 2462, 11 ); // 2.462 GHz
 
         memset( &_range, 0, sizeof( struct iw_range ) );
     }
     else
     {
         // <check if the driver overwrites stuff>
         int max = 0;
         for ( int r = sizeof( struct iw_range ); r < len; r++ )
             if (buffer[r] != 0)
                 max = r;
         if (max > 0)
         {
             owarn << "OWirelessNetworkInterface::buildInformation(): Driver for wireless interface '" << name()
                   << "' sucks! It overwrote the buffer end with at least " << max - sizeof( struct iw_range ) << " bytes!" << oendl;
         }
         // </check if the driver overwrites stuff>
 
         struct iw_range range;
         memcpy( &range, buffer, sizeof range );
 
         odebug << "OWirelessNetworkInterface::buildInformation(): Interface reported to have " << (int) range.num_frequency << " channels." << oendl;
         for ( int i = 0; i < range.num_frequency; ++i )
         {
             int freq = (int) ( double( range.freq[i].m ) * pow( 10.0, range.freq[i].e ) / 1000000.0 );
             odebug << "OWirelessNetworkInterface::buildInformation: Adding frequency " << freq << " as channel " << i+1 << oendl;
             _channels.insert( freq, i+1 );
         }
     }
 
     memcpy( &_range, buffer, sizeof( struct iw_range ) );
     odebug << "OWirelessNetworkInterface::buildInformation(): Information block constructed." << oendl;
-    free(buffer);
 }
 
 
 short OWirelessNetworkInterface::wirelessExtensionDriverVersion() const
 {
     return _range.we_version_compiled;
 }
 
 
 void OWirelessNetworkInterface::buildPrivateList()
 {
     odebug << "OWirelessNetworkInterface::buildPrivateList()" << oendl;
 
     struct iw_priv_args priv[IW_MAX_PRIV_DEF];
 
     _iwr.u.data.pointer = (char*) &priv;
     _iwr.u.data.length = IW_MAX_PRIV_DEF; // length in terms of number of (sizeof iw_priv_args), not (sizeof iw_priv_args) itself
     _iwr.u.data.flags = 0;
 
     if ( !wioctl( SIOCGIWPRIV ) )
     {
-        owarn << "OWirelessNetworkInterface::buildPrivateList(): Can't get private ioctl information." << oendl;
+        owarn << "OWirelessNetworkInterface::buildPrivateList(): Can't get private ioctl information (" << strerror( errno ) << ")." << oendl;
         return;
     }
 
     for ( int i = 0; i < _iwr.u.data.length; ++i )
     {
         new OPrivateIOCTL( this, priv[i].name, priv[i].cmd, priv[i].get_args, priv[i].set_args );
     }
     odebug << "OWirelessNetworkInterface::buildPrivateList(): Private ioctl list constructed." << oendl;
 }
 
 
 void OWirelessNetworkInterface::dumpInformation() const
 {
     odebug << "OWirelessNetworkInterface::() -------------- dumping information block ----------------" << oendl;
 
     odebug << " - driver's idea of maximum throughput is " << _range.throughput
            << " bps = " << ( _range.throughput / 8 ) << " byte/s = " << ( _range.throughput / 8 / 1024 )
            << " Kb/s = " << QString().sprintf("%f.2", float( _range.throughput ) / 8.0 / 1024.0 / 1024.0 )
            << " Mb/s" << oendl;
 
     odebug << " - driver for '" << name() << "' (V" << _range.we_version_source
            << ") has been compiled against WE V" << _range.we_version_compiled << oendl;
 
     if ( _range.we_version_compiled != WIRELESS_EXT )
@@ -1137,55 +1135,55 @@ OStationList* OWirelessNetworkInterface::scanNetwork()
                 {
                     odebug << "SIOCGIWMODE" << oendl;
                     stations->last()->type = modeToString( we->u.mode );
                     break;
                 }
                 case SIOCGIWFREQ:
                 {
                     odebug << "SIOCGIWFREQ" << oendl;
                     if ( we->u.freq.m > 1000 )
                         stations->last()->channel = _channels[ static_cast<int>(double( we->u.freq.m ) * pow( 10.0, we->u.freq.e ) / 1000000) ];
                     else
                         stations->last()->channel = static_cast<int>(((double) we->u.freq.m) * pow( 10.0, we->u.freq.e ));
                     break;
                 }
                 case SIOCGIWESSID:
                 {
                     odebug << "SIOCGIWESSID" << oendl;
                     we->u.essid.length = '\0'; // make sure it is zero terminated
                     stations->last()->ssid = static_cast<const char*> (we->u.essid.pointer);
                     odebug << "ESSID: " << stations->last()->ssid << oendl;
                     break;
                 }
                 case IWEVQUAL:
                 {
-                    odebug << "IWEVQUAL" << oendl; 
+                    odebug << "IWEVQUAL" << oendl;
                     stations->last()->level = static_cast<int>(we->u.qual.level);
                     break;             /* Quality part of statistics (scan) */
                 }
                 case SIOCGIWENCODE:
                 {
-                    odebug << "SIOCGIWENCODE" << oendl; 
+                    odebug << "SIOCGIWENCODE" << oendl;
                     stations->last()->encrypted = !(we->u.data.flags & IW_ENCODE_DISABLED);
                     break;
                 }
 
                 case SIOCGIWRATE:
                 {
                     odebug << "SIOCGIWRATE" << oendl;
                     stations->last()->rates.append(we->u.bitrate.value);
                     break;
                 }
                 case SIOCGIWSENS: odebug << "SIOCGIWSENS" << oendl; break;
                 case IWEVTXDROP: odebug << "IWEVTXDROP" << oendl; break;         /* Packet dropped to excessive retry */
                 case IWEVCUSTOM: odebug << "IWEVCUSTOM" << oendl; break;         /* Driver specific ascii string */
                 case IWEVREGISTERED: odebug << "IWEVREGISTERED" << oendl; break; /* Discovered a new node (AP mode) */
                 case IWEVEXPIRED: odebug << "IWEVEXPIRED" << oendl; break;       /* Expired a node (AP mode) */
                 default: odebug << "unhandled event" << oendl;
             }
 
         } while (true);
     }
     else
     {
         odebug << " - no results (timeout) :(" << oendl;
     }