/*
 * ethernet.c
 * validation-sample
 * 
 * Created by Jim Dovey on 6/1/2011.
 * 
 * Copyright (c) 2011 Jim Dovey
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the project's author nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <IOKit/IOKitLib.h>
#include <CoreFoundation/CoreFoundation.h>

CFDataRef CopyMACAddressData( void )
{
    kern_return_t           kr          = KERN_SUCCESS;
    CFMutableDictionaryRef  matching    = NULL;
    io_iterator_t           iterator    = IO_OBJECT_NULL;
    io_object_t             service     = IO_OBJECT_NULL;
    CFDataRef               result      = NULL;
    
    matching = IOBSDNameMatching( kIOMasterPortDefault, 0, "en0" );
    if ( matching == NULL )
    {
        fprintf( stderr, "IOBSDNameMatching() returned empty dictionary\n" );
        return ( NULL );
    }
    
    kr = IOServiceGetMatchingServices( kIOMasterPortDefault, matching, &iterator );
    if ( kr != KERN_SUCCESS )
    {
        fprintf( stderr, "IOServiceGetMatchingServices() returned %d\n", kr );
        return ( NULL );
    }
    
    while ( (service = IOIteratorNext(iterator)) != IO_OBJECT_NULL )
    {
        io_object_t parent = IO_OBJECT_NULL;
        
        kr = IORegistryEntryGetParentEntry( service, kIOServicePlane, &parent );
        if ( kr == KERN_SUCCESS )
        {
            if ( result != NULL )
                CFRelease( result );
            
            result = IORegistryEntryCreateCFProperty( parent, CFSTR("IOMACAddress"), kCFAllocatorDefault, 0 );
            IOObjectRelease( parent );
        }
        else
        {
            fprintf( stderr, "IORegistryGetParentEntry returned %d\n", kr );
        }
        
        IOObjectRelease( service );
    }
    
    return ( result );
}
