SCNetworkMigration.c   [plain text]

/*
 * Copyright (c) 2014-2017 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

//
//  SCNetworkMigration.c
//
//  Created by Ashish Kulkarni on 11/19/13.
//
//

#include <stdio.h>
#include <CoreFoundation/CoreFoundation.h>
#include "SCNetworkConfigurationInternal.h"
#include "SCPreferencesInternal.h"
#include <IOKit/network/IONetworkInterface.h>
#include <IOKit/network/IONetworkController.h>
#include <sys/stat.h>
#include <copyfile.h>
#include <sys/param.h>
#include <pthread.h>

#define BACK_TO_MY_MAC			CFSTR("BackToMyMac")
#define BACK_TO_MY_MAC_DSIDS		CFSTR("BackToMyMacDSIDs")
#define	PREFS_DEFAULT_DIR_PLIST		"/Library/Preferences/SystemConfiguration"
#define PREFS_DEFAULT_DIR_RELATIVE	CFSTR("Library/Preferences/SystemConfiguration/")
#define	PREFS_DEFAULT_CONFIG_PLIST	"preferences.plist"
#define	NETWORK_INTERFACES_PREFS_PLIST	"NetworkInterfaces.plist"
#define NUM_MIGRATION_PATHS		2
#define PLUGIN_ID			CFSTR("System Migration")
#define PREFERENCES_PLIST_INDEX		0
#define NETWORK_INTERFACES_PLIST_INDEX	1

#define kProtocolType			CFSTR("Protocol Type")
#define kProtocolConfiguration		CFSTR("Protocol Configuration")
#define kProtocolEnabled		CFSTR("Protocol Enabled")


const CFStringRef kSCNetworkConfigurationMigrationActionKey = CFSTR("MigrationActionKey");
const CFStringRef kSCNetworkConfigurationRepair = CFSTR("ConfigurationRepair");
#if	!TARGET_OS_IPHONE
static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToBridgeServices(SCPreferencesRef prefs);

static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToBondServices(SCPreferencesRef prefs);

static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToVLANServices(SCPreferencesRef prefs);
#endif
static Boolean
_SCNetworkConfigurationIsInterfaceNamerMappable(SCNetworkInterfaceRef interface1, SCNetworkInterfaceRef interface2, Boolean bypassActive);

static Boolean
_SCNetworkConfigurationMigrateConfiguration(CFURLRef sourceDir, CFURLRef targetDir);

static void
_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(CFURLRef baseURL, CFURLRef *prefs, CFURLRef *interfaces)
{
	if (baseURL != NULL) {
		CFRetain(baseURL);
	} else {
		baseURL = CFURLCreateFromFileSystemRepresentation(NULL,
								  (UInt8*)PREFS_DEFAULT_DIR_PLIST,
								  sizeof(PREFS_DEFAULT_DIR_PLIST),
								  TRUE);
	}

	*prefs = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL,
								       (UInt8*)PREFS_DEFAULT_CONFIG_PLIST,
								       sizeof(PREFS_DEFAULT_CONFIG_PLIST) - 1,
								       FALSE,
								       baseURL);

	*interfaces = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL,
									    (UInt8*)NETWORK_INTERFACES_PREFS_PLIST,
									    sizeof(NETWORK_INTERFACES_PREFS_PLIST) - 1,
									    FALSE,
									    baseURL);
	CFRelease(baseURL);
	return;
}

CFArrayRef
_SCNetworkConfigurationCopyMigrationPaths(CFDictionaryRef options)
{
	CFURLRef interfaces;
	CFMutableArrayRef migrationPaths = NULL;
	CFURLRef prefs;

	if (_SC_isInstallEnvironment()) {
		_sc_debug = 1;
	}
	_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(NULL, &prefs, &interfaces);

	migrationPaths = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	CFArrayInsertValueAtIndex(migrationPaths, PREFERENCES_PLIST_INDEX, prefs);
	CFArrayInsertValueAtIndex(migrationPaths, NETWORK_INTERFACES_PLIST_INDEX, interfaces);

	CFRelease(prefs);
	CFRelease(interfaces);
	return migrationPaths;
}

static Boolean
_SCNetworkConfigurationRemoveConfigurationFiles(CFURLRef configDir)
{

	char configPathString[PATH_MAX];
	CFURLRef configPathURL = NULL;
	char configNetworkInterfacesPathString[PATH_MAX];
	CFURLRef configNetworkInterfacesPathURL = NULL;

	_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(configDir, &configPathURL, &configNetworkInterfacesPathURL);

	if(!CFURLGetFileSystemRepresentation(configPathURL,
					     TRUE,
					     (UInt8*)configPathString,
					     sizeof(configPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configPathURL);
	} else {
		if (remove(configPathString) != 0) {
			SC_log(LOG_INFO, "remove(\"%s\") failed: %s", configPathString, strerror(errno));
		}
	}
	CFRelease(configPathURL);

	if(!CFURLGetFileSystemRepresentation(configNetworkInterfacesPathURL,
					     TRUE,
					     (UInt8*)configNetworkInterfacesPathString,
					     sizeof(configNetworkInterfacesPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configNetworkInterfacesPathURL);
	} else {
		if (remove(configNetworkInterfacesPathString) != 0) {
			SC_log(LOG_INFO, "remove(\"%s\") failed: %s", configNetworkInterfacesPathString, strerror(errno));
		}
	}
	CFRelease(configNetworkInterfacesPathURL);

	return TRUE;
}

static Boolean
SCNetworkConfigurationCopyConfigurationFiles(CFURLRef	configDir,
					     CFURLRef	targetDir)      // TargetDir needs to exist
{
	errno_t error;
	mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
	char networkInterfacesPathString[PATH_MAX];
	CFURLRef networkInterfacesPathURL = NULL;
	copyfile_state_t networkInterfacesState;
	char preferencesPathString[PATH_MAX];
	CFURLRef preferencesPathURL = NULL;
	Boolean removeTargetFiles = FALSE;
	copyfile_state_t state;
	Boolean success = FALSE;
	char targetNetworkInterfacesPathString[PATH_MAX];
	CFURLRef targetNetworkInterfacesPathURL = NULL;
	char targetPathString[PATH_MAX];
	CFURLRef targetPathURL = NULL;

	_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(targetDir, &targetPathURL, &targetNetworkInterfacesPathURL);

	if (!CFURLGetFileSystemRepresentation(targetPathURL,
					      TRUE,
					      (UInt8*)targetPathString,
					      sizeof(targetPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", targetPathURL);
		goto done;
	}
	if (!CFURLGetFileSystemRepresentation(targetNetworkInterfacesPathURL,
					      TRUE,
					      (UInt8*)targetNetworkInterfacesPathString,
					      sizeof(targetNetworkInterfacesPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", targetNetworkInterfacesPathURL);
		goto done;
	}

	if (configDir == NULL) {
		removeTargetFiles = TRUE;
		success = TRUE;
		goto done;
	}

	_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(configDir, &preferencesPathURL, &networkInterfacesPathURL);

	if (!CFURLGetFileSystemRepresentation(preferencesPathURL,
					      TRUE,
					      (UInt8*)preferencesPathString,
					      sizeof(preferencesPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", preferencesPathURL);
		goto done;
	}
	if (!CFURLGetFileSystemRepresentation(networkInterfacesPathURL,
					      TRUE,
					      (UInt8*)networkInterfacesPathString,
					      sizeof(networkInterfacesPathString))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", networkInterfacesPathURL);
		goto done;
	}

	state = copyfile_state_alloc();
	if ((error = copyfile(preferencesPathString, targetPathString, state, COPYFILE_ALL)) != 0) {
		SC_log(LOG_NOTICE, "copyFile(\"%s\", \"%s\", ...) failed: %s",
		       preferencesPathString,
		       targetPathString,
		       strerror(errno));
		copyfile_state_free(state);
		removeTargetFiles = TRUE;
		goto done;
	}
	copyfile_state_free(state);
	(void)chmod(targetPathString, mode);

	networkInterfacesState = copyfile_state_alloc();
	if ((error = copyfile(networkInterfacesPathString, targetNetworkInterfacesPathString, networkInterfacesState, COPYFILE_ALL)) != 0) {
		SC_log(LOG_NOTICE, "copyFile(\"%s\", \"%s\", ...) failed: %s",
		       networkInterfacesPathString,
		       targetNetworkInterfacesPathString,
		       strerror(errno));
		copyfile_state_free(networkInterfacesState);
		removeTargetFiles = TRUE;
		goto done;
	}
	copyfile_state_free(networkInterfacesState);
	(void)chmod(targetNetworkInterfacesPathString, mode);

	success = TRUE;
done:
	if (removeTargetFiles) {
		_SCNetworkConfigurationRemoveConfigurationFiles(targetDir);
	}
	if (preferencesPathURL != NULL) {
		CFRelease(preferencesPathURL);
	}
	if (networkInterfacesPathURL != NULL) {
		CFRelease(networkInterfacesPathURL);
	}
	if (targetPathURL != NULL) {
		CFRelease(targetPathURL);
	}
	if (targetNetworkInterfacesPathURL != NULL) {
		CFRelease(targetNetworkInterfacesPathURL);
	}
	return success;
}


/* -----------------------------------------------------------------------------
 Create directories and intermediate directories as required.
 ----------------------------------------------------------------------------- */
static Boolean
_SCNetworkConfigurationMakePathIfNeeded(CFURLRef pathURL)
{
	char    *c;
	mode_t  newmask;
	char	path[PATH_MAX];
	char    thepath[PATH_MAX];
	CFIndex slen=0;
	struct stat sb;
	Boolean success = FALSE;

	if (!CFURLGetFileSystemRepresentation(pathURL, TRUE, (UInt8 *)path, sizeof(path))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", pathURL);
		return success;
	}
	SC_log(LOG_INFO, "creating path: %s", path);

	newmask = S_IRWXU | S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH;

	slen = strlen(path);

	strlcpy(thepath, path, slen+1);
	c = thepath;
	if (*c == '/')
		c++;
	for(; !success; c++){
		if ((*c == '/') || (*c == '\0')){
			if (*c == '\0')
				success = TRUE;
			else
				*c = '\0';
			if (mkdir(thepath, newmask)){
				if (errno == EEXIST || errno == EISDIR){
					if (stat(thepath, &sb) < 0){
						SC_log(LOG_ERR, "stat returned value < 0");
						break;
					}
				} else {
					SC_log(LOG_ERR, "received error: %s", strerror(errno));
					break;
				}
			}
			*c = '/';
		}
	}
	return success;
}

static SCPreferencesRef
__SCNetworkCreateDefaultPref(CFStringRef prefsID)
{
	SCPreferencesRef prefs;
	SCNetworkSetRef currentSet;
	CFStringRef model;

	prefs = SCPreferencesCreate(NULL, PLUGIN_ID, prefsID);
	if (prefs == NULL) {
		return NULL;
	}

	currentSet = SCNetworkSetCopyCurrent(prefs);
	if (currentSet == NULL) {
		currentSet = _SCNetworkSetCreateDefault(prefs);
	}
	SCNetworkSetEstablishDefaultConfiguration(currentSet);
	CFRelease(currentSet);

	model = SCPreferencesGetValue(prefs, MODEL);
	if (model == NULL) {
		model = _SC_hw_model(FALSE);
		SCPreferencesSetValue(prefs, MODEL, model);
	}

	return prefs;
}

__private_extern__
SCPreferencesRef
__SCNetworkCreateDefaultNIPrefs(CFStringRef prefsID)
{
	CFMutableArrayRef interfaces = NULL;
	CFStringRef model;
	CFArrayRef networkInterfaces;
	SCPreferencesRef ni_prefs;
	CFComparisonResult res;

	networkInterfaces = __SCNetworkInterfaceCopyAll_IONetworkInterface(TRUE);
	if (networkInterfaces == NULL) {
		SC_log(LOG_NOTICE, "networkInterfaces is NULL");
		return NULL;
	}
	if (prefsID == NULL) {
		prefsID = CFStringCreateWithFormat(NULL, NULL, CFSTR("%@/%@"), PREFS_DEFAULT_DIR, NETWORK_INTERFACES_PREFS);
	}
	else {
		CFRetain(prefsID);
	}

	ni_prefs = SCPreferencesCreate(NULL, PLUGIN_ID , prefsID);
	CFRelease(prefsID);

	if (ni_prefs == NULL) {
		SC_log(LOG_NOTICE, "ni_prefs is NULL");
		goto done;
	}

	interfaces = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(networkInterfaces); idx++) {
		CFIndex idx2 = 0;
		CFNumberRef if_type;
		CFNumberRef if_unit;
		SCNetworkInterfaceRef interface = CFArrayGetValueAtIndex(networkInterfaces, idx);
		CFDictionaryRef interfaceEntity = __SCNetworkInterfaceCopyStorageEntity(interface);

		if (interfaceEntity == NULL) {
			continue;
		}

		if_type = _SCNetworkInterfaceGetIOInterfaceType(interface);
		if_unit = _SCNetworkInterfaceGetIOInterfaceUnit(interface);

		if ((if_type == NULL) || (if_unit == NULL)) {
			CFRelease(interfaceEntity);
			continue;
		}

		for (idx2 = 0; idx2 < CFArrayGetCount(interfaces); idx2++) {
			CFNumberRef db_type;
			CFNumberRef db_unit;
			CFDictionaryRef dict = CFArrayGetValueAtIndex(interfaces, idx2);

			db_type = CFDictionaryGetValue(dict, CFSTR(kIOInterfaceType));
			db_unit = CFDictionaryGetValue(dict, CFSTR(kIOInterfaceUnit));
			res = CFNumberCompare(if_type, db_type, NULL);
			if (res == kCFCompareLessThan
			|| (res == kCFCompareEqualTo
			&& (CFNumberCompare(if_unit, db_unit, NULL) == kCFCompareLessThan))) {
				break;
			}
		}

		CFArrayInsertValueAtIndex(interfaces, idx2, interfaceEntity);
		CFRelease(interfaceEntity);

	}
	SCPreferencesSetValue(ni_prefs, INTERFACES, interfaces);

	model = SCPreferencesGetValue(ni_prefs, MODEL);
	if (model == NULL) {
		model = _SC_hw_model(FALSE);
		SCPreferencesSetValue(ni_prefs, MODEL, model);
	}
done:
	if (interfaces != NULL) {
		CFRelease(interfaces);
	}
	if (networkInterfaces != NULL) {
		CFRelease(networkInterfaces);
	}

	return ni_prefs;
}


/*
 *  _SCNetworkConfigurationPerformMigration will migrate configuration between source and destination systems
 */
CF_RETURNS_RETAINED
CFArrayRef
_SCNetworkConfigurationPerformMigration(CFURLRef sourceDir, CFURLRef currentDir, CFURLRef targetDir, CFDictionaryRef options)
{
	CFURLRef currentDirConfig = NULL;
	CFURLRef currentSystemPath = NULL;
	Boolean migrationComplete = FALSE;
	CFArrayRef paths = NULL;
	Boolean removeTargetOnFailure = FALSE;
	CFURLRef sourceDirConfig = NULL;
	CFURLRef targetDirConfig = NULL;

	if (_SC_isInstallEnvironment()) {
		_sc_debug = 1;
	}

	// Both sourceDir and currentDir cannot be NULL because NULL value indicates using current system
	if (sourceDir == NULL && currentDir == NULL) {
		SC_log(LOG_INFO, "Both sourceDir and currentDir are NULL");
		goto done;
	}

	currentSystemPath = CFURLCreateWithString(NULL,
						  PREFS_DEFAULT_DIR,
						  NULL);

	// if either of the sourceDir or currentDir are NULL, then populate it with current system path
	if (sourceDir == NULL) {
		sourceDirConfig = CFRetain(currentSystemPath);
	}
	else {
		sourceDirConfig = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE, kCFURLPOSIXPathStyle, TRUE, sourceDir);
	}

	if (currentDir != NULL) {
		currentDirConfig = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE, kCFURLPOSIXPathStyle, TRUE, currentDir);
	}
	// If the targetDir is not provided then migration will take place in currentDir
	if (targetDir == NULL) {
		targetDirConfig = CFRetain(currentSystemPath);
	}
	else {
		targetDirConfig = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE, kCFURLPOSIXPathStyle, TRUE, targetDir);
	}
	// Source directory cannot be the same as Target Directory
	if (CFEqual(sourceDirConfig, targetDirConfig)) {
		SC_log(LOG_INFO, "Source directory cannot be the same as target directory");
		goto done;
	}

	if ((currentDirConfig == NULL) || !CFEqual(currentDirConfig, targetDirConfig)) {
		if (!_SCNetworkConfigurationMakePathIfNeeded(targetDirConfig)) {
			SC_log(LOG_INFO, "Could not create target directory");
			goto done;
		}

		if (!SCNetworkConfigurationCopyConfigurationFiles(currentDirConfig, targetDirConfig)) {
			SC_log(LOG_INFO, "Could not copy configuration files from \"%@\" to \"%@\"",
			       currentDirConfig,
			       targetDirConfig);
		}
		else if (currentDirConfig != NULL) {
			removeTargetOnFailure = TRUE;	// Configuration files were copied over to target directory
							// If migration failed, then we should remove those configuration
							// files since current directory and target directory are not
							// the same
		}
	}

	// If both source and current configurations point to current system, then no migration needs to be done.
	if ((currentDirConfig != NULL) && CFEqual(sourceDirConfig, currentDirConfig)) {
		SC_log(LOG_INFO, "No migration needed, source and current configurations point to same path");
		migrationComplete = TRUE;
	}
	else {
		migrationComplete = _SCNetworkConfigurationMigrateConfiguration(sourceDirConfig, targetDirConfig);
	}
	if (migrationComplete) {
		SC_log(LOG_NOTICE, "Migration complete");
		paths = _SCNetworkConfigurationCopyMigrationPaths(NULL);
	} else {
		SC_log(LOG_NOTICE, "Migration failed: %s", SCErrorString(SCError()));

		// If migration fails, then remove configuration files from target config if they are
		// copied from the current directory
		if (removeTargetOnFailure) {
			_SCNetworkConfigurationRemoveConfigurationFiles(targetDirConfig);
		}
	}
done:
	if (currentDirConfig != NULL) {
		CFRelease(currentDirConfig);
	}
	if (currentSystemPath != NULL) {
		CFRelease(currentSystemPath);
	}
	if (sourceDirConfig != NULL) {
		CFRelease(sourceDirConfig);
	}
	if (targetDirConfig != NULL) {
		CFRelease(targetDirConfig);
	}
	return paths;
}

static Boolean
_SCNetworkConfigurationMigrateIsFilePresent(CFURLRef filePath)
{
	Boolean fileExists = false;
	char filePathStr[PATH_MAX];
	int statResult = 0;
	struct stat statStruct = {0, };

	if (filePath == NULL) {
		SC_log(LOG_DEBUG, "filePath is NULL");
		goto done;
	}

	if (!CFURLGetFileSystemRepresentation(filePath, TRUE, (UInt8*) filePathStr, sizeof(filePathStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", filePath);
		goto done;
	}

	statResult = stat(filePathStr, &statStruct);
	if (statResult == 0) {
		fileExists = TRUE;
	}
done:
	return fileExists;
}

static Boolean
__SCNetworkConfigurationMigrateConfigurationFilesPresent(CFURLRef baseURL, CFArrayRef* migrationPaths)
{
	Boolean configFilesPresent = FALSE;
	CFIndex count;
	CFURLRef filePath = NULL;
	CFURLRef interfaces;
	CFMutableArrayRef migrationPathsMutable = NULL;
	CFURLRef prefs;

	if (baseURL == NULL) {
		SC_log(LOG_INFO, "No base migration URL");
		goto done;
	}

	_SCNetworkConfigurationCopyMigrationPathsWithBaseURL(baseURL, &prefs, &interfaces);

	migrationPathsMutable = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
	CFArrayInsertValueAtIndex(migrationPathsMutable, PREFERENCES_PLIST_INDEX, prefs);
	CFArrayInsertValueAtIndex(migrationPathsMutable, NETWORK_INTERFACES_PLIST_INDEX, interfaces);

	CFRelease(prefs);
	CFRelease(interfaces);

	*migrationPaths = migrationPathsMutable;

	if ((*migrationPaths == NULL) ||
	    ((count = CFArrayGetCount(*migrationPaths)) == 0)) {
		SC_log(LOG_INFO, "No migration paths");
		goto done;
	}

	for (CFIndex idx = 0; idx < count; idx++) {
		filePath = CFArrayGetValueAtIndex(*migrationPaths, idx);
		if (_SCNetworkConfigurationMigrateIsFilePresent(filePath) ==  FALSE) {
			SC_log(LOG_INFO, "Required migration file not present: %@", filePath);
			goto done;
		}
	}

	configFilesPresent = TRUE;	// all necessary configuration files present
done:
	return configFilesPresent;
}


static CFMutableArrayRef
_SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(SCPreferencesRef ni_prefs, Boolean isBuiltin)
{
	CFIndex count = 0;
	SCNetworkInterfaceRef interface;
	CFArrayRef interfaceList = NULL;
	CFMutableArrayRef resultInterfaceList = NULL;

	interfaceList = __SCNetworkInterfaceCopyStoredWithPreferences(ni_prefs);
	if (interfaceList == NULL) {
		SC_log(LOG_INFO, "No interfaces");
		goto done;
	}

	count = CFArrayGetCount(interfaceList);
	if (count > 0) {
		resultInterfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	}

	for (CFIndex i = 0; i < count; i++) {
		interface = CFArrayGetValueAtIndex(interfaceList, i);

		if (_SCNetworkInterfaceIsBuiltin(interface) == isBuiltin) {
			CFArrayAppendValue(resultInterfaceList, interface);
		}
	}

done:
	if (interfaceList != NULL) {
		CFRelease(interfaceList);
	}
	return resultInterfaceList;
}

static CFMutableDictionaryRef
_SCNetworkInterfaceStorageCopyMaxUnitPerInterfaceType(SCPreferencesRef ni_prefs)
{
	CFNumberRef cfMaxUnit;
	CFIndex count = 0;
	CFArrayRef ifList = NULL;
	SCNetworkInterfaceRef interface;
	CFMutableDictionaryRef interfaceTypeToMaxUnitMapping = NULL;
	CFNumberRef type;
	CFNumberRef unit;

	ifList = __SCNetworkInterfaceCopyStoredWithPreferences(ni_prefs);
	if (ifList == NULL) {
		SC_log(LOG_INFO, "No interfaces");
		return NULL;
	}

	interfaceTypeToMaxUnitMapping = CFDictionaryCreateMutable(NULL, 0,
								    &kCFTypeDictionaryKeyCallBacks,
								    &kCFTypeDictionaryValueCallBacks);
	count = CFArrayGetCount(ifList);
	for (CFIndex idx = 0; idx < count; idx++) {
		cfMaxUnit = NULL;
		interface = CFArrayGetValueAtIndex(ifList, idx);

		if (isA_SCNetworkInterface(interface) == NULL) {
			continue;
		}

		type  = _SCNetworkInterfaceGetIOInterfaceType(interface);
		if (isA_CFNumber(type) == NULL) {
			SC_log(LOG_INFO, "No interface type");
			continue;
		}

		if (!CFDictionaryContainsKey(interfaceTypeToMaxUnitMapping, type)) {
			int temp = 0;
			cfMaxUnit = CFNumberCreate(NULL, kCFNumberIntType, &temp);
			CFDictionaryAddValue(interfaceTypeToMaxUnitMapping, type, cfMaxUnit);
			CFRelease(cfMaxUnit);
		}

		if (cfMaxUnit == NULL) {
			cfMaxUnit = CFDictionaryGetValue(interfaceTypeToMaxUnitMapping, type);
		}

		unit = _SCNetworkInterfaceGetIOInterfaceUnit(interface);

		if (isA_CFNumber(unit) == NULL) {
			continue;
		}

		if (CFNumberCompare(unit, cfMaxUnit, NULL) == kCFCompareGreaterThan) {
			CFDictionarySetValue(interfaceTypeToMaxUnitMapping, type, unit);
		}
	}
	if (ifList != NULL) {
		CFRelease(ifList);
	}
	return interfaceTypeToMaxUnitMapping;
}

static CFMutableDictionaryRef
_SCNetworkConfigurationCopyBuiltinMapping (SCPreferencesRef sourcePrefs, SCPreferencesRef targetPrefs)
{
	CFMutableDictionaryRef builtinMapping = NULL;
	CFIndex sourceBuiltinInterfaceCount = 0;
	CFMutableArrayRef sourceBuiltinInterfaces = NULL;
	SCNetworkInterfaceRef sourceInterface;
	CFIndex targetBuiltinInterfaceCount = 0;
	CFMutableArrayRef targetBuiltinInterfaces = NULL;
	SCNetworkInterfaceRef targetInterface;

	sourceBuiltinInterfaces = _SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(sourcePrefs, TRUE);
	if (isA_CFArray(sourceBuiltinInterfaces) == NULL) {
		SC_log(LOG_INFO, "No source built-in interfaces");
		goto done;
	}
	sourceBuiltinInterfaceCount = CFArrayGetCount(sourceBuiltinInterfaces);

	targetBuiltinInterfaces = _SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(targetPrefs, TRUE);
	if (isA_CFArray(targetBuiltinInterfaces) == NULL) {
		SC_log(LOG_INFO, "No target built-in interfaces");
		goto done;
	}
	targetBuiltinInterfaceCount = CFArrayGetCount(targetBuiltinInterfaces);

	// Builtin Mapping will try to map all source interfaces into target interfaces
	for (CFIndex idx = 0; idx < sourceBuiltinInterfaceCount; idx++) {
		sourceInterface = CFArrayGetValueAtIndex(sourceBuiltinInterfaces, idx);
		for (CFIndex idx2 = 0; idx2 < targetBuiltinInterfaceCount; idx2++) {
			targetInterface = CFArrayGetValueAtIndex(targetBuiltinInterfaces, idx2);

			if (_SCNetworkConfigurationIsInterfaceNamerMappable(sourceInterface, targetInterface, FALSE)) {
				if (builtinMapping == NULL) {
					builtinMapping = CFDictionaryCreateMutable(NULL, 0,
										   &kCFTypeDictionaryKeyCallBacks,
										   &kCFTypeDictionaryValueCallBacks);
				}
				CFDictionaryAddValue(builtinMapping, sourceInterface, targetInterface);
				CFArrayRemoveValueAtIndex(targetBuiltinInterfaces, idx2);
				break;
			}
		}
		targetBuiltinInterfaceCount = CFArrayGetCount(targetBuiltinInterfaces);
	}

done:
	if (sourceBuiltinInterfaces != NULL) {
		CFRelease(sourceBuiltinInterfaces);
	}
	if (targetBuiltinInterfaces != NULL) {
		CFRelease(targetBuiltinInterfaces);
	}
	return builtinMapping;
}

static CFMutableDictionaryRef
_SCNetworkConfigurationCopyExternalInterfaceMapping (SCPreferencesRef sourcePref, SCPreferencesRef targetPrefs)
{
	CFNumberRef cfMaxTargetUnit = NULL;
	CFNumberRef currentInterfaceUnit = NULL;
	CFMutableDictionaryRef externalMapping = NULL;
	CFMutableDictionaryRef interfaceTypeToMaxUnitMapping = NULL;
	int maxTargetUnit;
	int newTargetUnit;
	CFIndex sourceExternalInterfaceCount = 0;
	CFMutableArrayRef sourceExternalInterfaces = NULL;
	SCNetworkInterfaceRef sourceInterface = NULL;
	CFIndex targetExternalInterfaceCount = 0;
	CFMutableArrayRef targetExternalInterfaces = NULL;
	SCNetworkInterfaceRef targetInterface = NULL;
	CFNumberRef type;

	sourceExternalInterfaces = _SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(sourcePref, FALSE);
	if (isA_CFArray(sourceExternalInterfaces) == NULL) {
		SC_log(LOG_INFO, "No source external interfaces");
		goto done;
	}
	sourceExternalInterfaceCount = CFArrayGetCount(sourceExternalInterfaces);
	if (sourceExternalInterfaceCount == 0) {
		SC_log(LOG_INFO, "No source external interfaces");
		goto done;
	}

	targetExternalInterfaces = _SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(targetPrefs, FALSE);
	if (isA_CFArray(targetExternalInterfaces) == NULL) {
		SC_log(LOG_INFO, "No target external interfaces");
		goto done;
	}

	interfaceTypeToMaxUnitMapping = _SCNetworkInterfaceStorageCopyMaxUnitPerInterfaceType(targetPrefs);
	externalMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	// Map all external interfaces which exist in both source and target
	for (CFIndex idx = 0; idx < sourceExternalInterfaceCount; idx++) {
		sourceInterface = CFArrayGetValueAtIndex(sourceExternalInterfaces, idx);
		targetExternalInterfaceCount = CFArrayGetCount(targetExternalInterfaces);
		currentInterfaceUnit = NULL;

		for (CFIndex idx2 = 0; idx2 < targetExternalInterfaceCount; idx2++) {
			targetInterface = CFArrayGetValueAtIndex(targetExternalInterfaces, idx2);

			if (_SCNetworkConfigurationIsInterfaceNamerMappable(sourceInterface, targetInterface, TRUE)) {
				CFDictionaryAddValue(externalMapping, sourceInterface, targetInterface);
				CFArrayRemoveValueAtIndex(targetExternalInterfaces, idx2);
				break;
			}
		}

		if (!CFDictionaryContainsKey(externalMapping, sourceInterface)) {
			// Create new mappings for external source interfaces which don't exist in the target
			type = _SCNetworkInterfaceGetIOInterfaceType(sourceInterface);

			cfMaxTargetUnit = CFDictionaryGetValue(interfaceTypeToMaxUnitMapping, type);
			if (cfMaxTargetUnit != NULL) {
				CFNumberGetValue(cfMaxTargetUnit, kCFNumberIntType, &maxTargetUnit);
				newTargetUnit = maxTargetUnit + 1;
			}
			else {
				newTargetUnit = 0;
			}

			cfMaxTargetUnit = CFNumberCreate(NULL, kCFNumberIntType, &newTargetUnit);
			CFDictionarySetValue(interfaceTypeToMaxUnitMapping, type, cfMaxTargetUnit);

			targetInterface = (SCNetworkInterfaceRef)__SCNetworkInterfaceCreateCopy(NULL, sourceInterface, NULL, NULL);

			SC_log(LOG_DEBUG, "sourceInterface: %p, target Interface: %p", sourceInterface, targetInterface);

			currentInterfaceUnit = _SCNetworkInterfaceGetIOInterfaceUnit(targetInterface);

			if ((isA_CFNumber(currentInterfaceUnit) == NULL) ||
			    !CFEqual(currentInterfaceUnit, cfMaxTargetUnit)) {
				// Update the interface unit
				__SCNetworkInterfaceSetIOInterfaceUnit(targetInterface, cfMaxTargetUnit);
			}

			CFDictionaryAddValue(externalMapping, sourceInterface, targetInterface);

			CFRelease(targetInterface);
			targetInterface = NULL;
			CFRelease(cfMaxTargetUnit);
			cfMaxTargetUnit = NULL;
		}
	}
done:
	if (sourceExternalInterfaces != NULL) {
		CFRelease(sourceExternalInterfaces);
	}
	if (targetExternalInterfaces != NULL) {
		CFRelease(targetExternalInterfaces);
	}
	if (interfaceTypeToMaxUnitMapping != NULL) {
		CFRelease(interfaceTypeToMaxUnitMapping);
	}
	return externalMapping;
}
static Boolean
__SCNetworkConfigurationInterfaceNameIsEquiv(CFStringRef interfaceName1, CFStringRef interfaceName2);

static Boolean
_SCNetworkConfigurationIsInterfaceNamerMappable(SCNetworkInterfaceRef interface1, SCNetworkInterfaceRef interface2, Boolean bypassActive)
{
	Boolean interface1IsBuiltin;
	CFStringRef interface1Prefix;
	CFStringRef interface1Type;
	CFStringRef interface1UserDefinedName;
	Boolean interface2IsBuiltin;
	CFStringRef interface2Prefix;
	CFStringRef interface2Type;
	CFStringRef interface2UserDefinedName;

	if (interface1 == interface2) {
		// No work needs to be done
		return TRUE;
	}
	interface1IsBuiltin = _SCNetworkInterfaceIsBuiltin(interface1);
	interface2IsBuiltin = _SCNetworkInterfaceIsBuiltin(interface2);

	interface1UserDefinedName = SCNetworkInterfaceGetLocalizedDisplayName(interface1);
	interface2UserDefinedName = SCNetworkInterfaceGetLocalizedDisplayName(interface2);

	interface1Type = SCNetworkInterfaceGetInterfaceType(interface1);
	interface2Type = SCNetworkInterfaceGetInterfaceType(interface2);

	interface1Prefix = _SCNetworkInterfaceGetIOInterfaceNamePrefix(interface1);
	interface2Prefix = _SCNetworkInterfaceGetIOInterfaceNamePrefix(interface2);

	// Check if have same builtin values.
	// Check if User Defined name matches
	// Check if SCNetwork Interface Type matches

	if (interface1IsBuiltin != interface2IsBuiltin) {
		return FALSE;
	}

	if (!_SC_CFEqual(interface1Type, interface2Type)) {
		return FALSE;
	}

	if (!_SC_CFEqual(interface1Prefix, interface2Prefix)) {
		return FALSE;
	}

	if (!_SC_CFEqual(interface1UserDefinedName, interface2UserDefinedName)) {
		// Checking if we have a mismatch because of the name Ethernet and Ethernet 1
		// Checking if we have a mismatch because of the name Airport and WiFi
		if (interface1IsBuiltin &&
		    interface2IsBuiltin &&
		    __SCNetworkConfigurationInterfaceNameIsEquiv(interface1UserDefinedName, interface2UserDefinedName)) {
			    return TRUE;
		}
		return FALSE;
	}
	return TRUE;
}

static Boolean
__SCNetworkConfigurationInterfaceNameIsEquiv(CFStringRef interfaceName1, CFStringRef interfaceName2)
{
	CFStringRef interfaceArray[] = { CFSTR("iPhone"), CFSTR("iPad"), CFSTR("iPod"), CFSTR("AppleTV") };
	const int interfaceCount = sizeof(interfaceArray) / sizeof(CFStringRef);
	CFStringRef portSuffix = CFSTR(", Port 1");

	if ((isA_CFString(interfaceName1) != NULL) &&
	    (isA_CFString(interfaceName2) != NULL)) {
		if (!CFEqual(interfaceName1, interfaceName2)) {
			// Check if we are looking at the WiFi interface
			if ((CFEqual(interfaceName1, CFSTR("AirPort")) ||
			     (CFEqual(interfaceName1, CFSTR("Wi-Fi")))) &&
			    (CFEqual(interfaceName2, CFSTR("AirPort")) ||
			     (CFEqual(interfaceName2, CFSTR("Wi-Fi"))))) {
				return TRUE;
			}

			if (((CFEqual(interfaceName1, CFSTR("Ethernet"))) ||
			     (CFEqual(interfaceName1, CFSTR("Ethernet 1")))) &&
			    ((CFEqual(interfaceName2, CFSTR("Ethernet"))) ||
			     (CFEqual(interfaceName2, CFSTR("Ethernet 1"))))) {
				return TRUE;
			}

			if ((CFStringHasSuffix(interfaceName1, portSuffix) &&
			    (CFStringCompareWithOptions(interfaceName1, interfaceName2, CFRangeMake(0, (CFStringGetLength(interfaceName1) - CFStringGetLength(portSuffix))), 0) == kCFCompareEqualTo)) ||
			    (CFStringHasSuffix(interfaceName2, portSuffix) &&
			     (CFStringCompareWithOptions(interfaceName2, interfaceName1, CFRangeMake(0, (CFStringGetLength(interfaceName2) - CFStringGetLength(portSuffix))), 0) == kCFCompareEqualTo))) {
				return TRUE;
			}

			for (CFIndex idx = 0; idx < interfaceCount; idx++) {
				CFStringRef tempInterfaceName = interfaceArray[idx];
				if ((CFEqual(interfaceName1, tempInterfaceName) ||
				     __SCNetworkInterfaceMatchesName(interfaceName1, tempInterfaceName)) &&
				    (CFEqual(interfaceName2, tempInterfaceName) ||
				     __SCNetworkInterfaceMatchesName(interfaceName2, tempInterfaceName))) {
					return TRUE;
				}
			}
		}
		else {
			return TRUE;
		}
	}

	return FALSE;
}

typedef struct {
	CFDictionaryRef interfaceMapping;
	CFMutableArrayRef interfacesMissingServices;
} SCNetworkConfigurationMissingServiceContext;

typedef struct {
	CFDictionaryRef bsdNameToBridgeServices;	// Mapping of BSD Name to SCBridgeInterfaceRef
	CFDictionaryRef bsdNameToBondServices;		// Mapping of BSD Name to SCBondInterfaceRef
	CFDictionaryRef bsdNameToVLANServices;		// Mapping of BSD Name to SCVLANInterfaceRef
	CFDictionaryRef interfaceMapping;
	Boolean* isValid;
	CFMutableArrayRef interfaceToBeRemoved;	// SCNetworkInterfaceRef. Services containing the interface will be removed
	CFMutableArrayRef interfaceToBeReplaced;// SCNetworkInterfaceRef. Services containing the interface will be replaced with default service
	CFMutableArrayRef interfacePreserveServiceInformation; // SCNetworkInterfaceRef. Services containing the interface will be replaced with new service which has same configuration as the current service with issue.
	CFMutableDictionaryRef bsdNameServiceProtocolPreserveMapping;
	SCPreferencesRef prefs;
	Boolean repair;
} SCNetworkConfigurationValidityContext;

static void
_SCNetworkConfigurationValidateInterface (const void *key, const void *value, void *context)
{
	CFStringRef bsdName = (CFStringRef)key;
	SCNetworkConfigurationValidityContext *ctx = (SCNetworkConfigurationValidityContext*)context;
	CFDictionaryRef bsdNameToBridgeServices = ctx->bsdNameToBridgeServices;
	CFDictionaryRef bsdNameToBondServices = ctx->bsdNameToBondServices;
	CFDictionaryRef bsdNameToVLANServices = ctx->bsdNameToVLANServices;
	SCNetworkInterfaceRef interface = NULL;
	CFDictionaryRef interfaceMapping = ctx->interfaceMapping;
	CFStringRef interfaceUserDefinedName = NULL;
	Boolean repair = ctx->repair;
	SCNetworkInterfaceRef serviceInterface = (SCNetworkInterfaceRef)value;
	CFStringRef serviceInterfaceUserDefinedName = NULL;
	CFMutableArrayRef interfaceToBeRemoved = ctx->interfaceToBeRemoved;
	CFMutableArrayRef interfaceToBeReplaced = ctx->interfaceToBeReplaced;
	CFMutableArrayRef interfacePreserveServiceInformation = ctx->interfacePreserveServiceInformation;

	// No work needs to be done if we have already made determination that configuration somewhere is not valid,
	// or we don't intend to repair invalid configuration.
	if ((*ctx->isValid == FALSE) && !repair) {
		return;
	}

	// There is no interface present for the service
	interface = CFDictionaryGetValue(interfaceMapping, bsdName);
	if (interface == NULL) {
		if ((((bsdNameToBridgeServices != NULL) && !CFDictionaryContainsKey(bsdNameToBridgeServices, bsdName))) &&
		    (((bsdNameToBondServices != NULL) && !CFDictionaryContainsKey(bsdNameToBondServices, bsdName))) &&
		    (((bsdNameToVLANServices != NULL) && !CFDictionaryContainsKey(bsdNameToVLANServices, bsdName)))) {
			// Not a virtual interface
			SC_log(LOG_INFO, "No real interface with BSD name (%@) for service", bsdName);

			if (repair) {
				CFArrayAppendValue(interfaceToBeRemoved, serviceInterface);
			}
			*ctx->isValid = FALSE;
		}
		return;
	}

	// Need to compare between both SCNetworkInterfaceRefs
	interfaceUserDefinedName = __SCNetworkInterfaceGetUserDefinedName(interface);
	serviceInterfaceUserDefinedName = __SCNetworkInterfaceGetUserDefinedName(serviceInterface);

	if (!__SCNetworkConfigurationInterfaceNameIsEquiv(interfaceUserDefinedName, serviceInterfaceUserDefinedName)) {
		SC_log(LOG_INFO, "Interface user defined name (%@) doesn't match service/interface user defined name: %@",
		       interfaceUserDefinedName,
		       serviceInterfaceUserDefinedName);
		*ctx->isValid = FALSE;
		// Check if the service interface name is set to localized key
		if (isA_CFArray(interfacePreserveServiceInformation) != NULL &&
		    __SCNetworkInterfaceMatchesName(interfaceUserDefinedName, serviceInterfaceUserDefinedName)) {
			SC_log(LOG_NOTICE, "serviceInterfaceUserDefinedName: %@ is the localized key for interface name: %@", serviceInterfaceUserDefinedName, interfaceUserDefinedName);
			CFArrayAppendValue(interfacePreserveServiceInformation, serviceInterface);
		}
		// Add service interface to the interfaceToBeReplaced list
		if (isA_CFArray(interfaceToBeReplaced) != NULL) {
			CFArrayAppendValue(interfaceToBeReplaced, interface);
		}
		if (isA_CFArray(interfaceToBeRemoved) != NULL) {
			CFArrayAppendValue(interfaceToBeRemoved, serviceInterface);
		}
		return;
	}
}

static void
_SCNetworkConfigurationCollectMissingService(const void *key, const void *value, void *context)
{
	CFStringRef bsdName = (CFStringRef)key;
	SCNetworkConfigurationMissingServiceContext *ctx = (SCNetworkConfigurationMissingServiceContext*)context;
	SCNetworkInterfaceRef interface = (SCNetworkInterfaceRef)value;
	CFMutableArrayRef interfacesMissingServices = ctx->interfacesMissingServices;
	CFDictionaryRef serviceInterfaceMapping = ctx->interfaceMapping;

	if ((isA_SCNetworkInterface(interface) == NULL) ||
	    !_SCNetworkInterfaceIsBuiltin(interface)) {
		return;
	}

	// Check if services have mapping for the BSD name of the interface
	if (!CFDictionaryContainsKey(serviceInterfaceMapping, bsdName)) {
		CFArrayAppendValue(interfacesMissingServices, interface); // Adding interface since the corresponding service seems to be missing
	}
}

static Boolean
_SCNetworkConfigurationCreateBuiltinInterfaceServices(SCPreferencesRef pref,
						      SCPreferencesRef ni_pref)
{
	SCNetworkConfigurationMissingServiceContext context;
	SCNetworkInterfaceRef interface = NULL;
	CFArrayRef interfaces = NULL;
	CFMutableArrayRef interfacesWithoutService = NULL;
	CFDictionaryRef mappingBSDNameToInterface = NULL;
	CFDictionaryRef mappingServiceBSDNameToInterface = NULL;
	CFIndex missingServiceCount = 0;
	Boolean success = FALSE;

	interfaces = __SCNetworkInterfaceCopyStoredWithPreferences(ni_pref);
	if (interfaces == NULL) {
		SC_log(LOG_NOTICE, "No interfaces");
		goto done;
	}

	mappingBSDNameToInterface = __SCNetworkInterfaceCreateMappingUsingBSDName(interfaces);
	CFRelease(interfaces);
	if (isA_CFDictionary(mappingBSDNameToInterface) == NULL) {
		goto done;
	}

	interfaces = __SCNetworkServiceCopyAllInterfaces(pref);
	if (interfaces == NULL) {
		SC_log(LOG_INFO, "No interfaces");
		goto done;
	}
	mappingServiceBSDNameToInterface = __SCNetworkInterfaceCreateMappingUsingBSDName(interfaces);
	CFRelease(interfaces);
	if (isA_CFDictionary(mappingServiceBSDNameToInterface) == NULL) {
		goto done;
	}

	interfacesWithoutService = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	context.interfaceMapping = mappingServiceBSDNameToInterface;
	context.interfacesMissingServices = interfacesWithoutService;

	CFDictionaryApplyFunction(mappingBSDNameToInterface, _SCNetworkConfigurationCollectMissingService, &context);
	missingServiceCount = CFArrayGetCount(interfacesWithoutService);

	success = TRUE;

	for (CFIndex idx = 0; idx < missingServiceCount; idx++) {
		interface = CFArrayGetValueAtIndex(interfacesWithoutService, idx);

		if (!__SCNetworkServiceCreate(pref, interface, NULL)) {
			SC_log(LOG_INFO, "Could not add service for interface: %@", interface);
			success = FALSE;
		}
	}
done:
	if (mappingBSDNameToInterface != NULL) {
		CFRelease(mappingBSDNameToInterface);
	}
	if (mappingServiceBSDNameToInterface != NULL) {
		CFRelease(mappingServiceBSDNameToInterface);
	}
	if (interfacesWithoutService != NULL) {
		CFRelease(interfacesWithoutService);
	}

	return success;
}

static void
add_service(const void *value, void *context)
{
	SCNetworkConfigurationValidityContext *ctx = (SCNetworkConfigurationValidityContext *)context;
	SCNetworkSetRef currentSet = NULL;
	Boolean enabled;
	SCNetworkInterfaceRef interface = (SCNetworkInterfaceRef)value;
	CFDictionaryRef bsdNameServiceProtocolMapping = ctx->bsdNameServiceProtocolPreserveMapping;
	SCPreferencesRef prefs = ctx->prefs;
	SCNetworkServiceRef service;
	CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);
	CFArrayRef protocolArray = NULL;

	if (isA_CFString(bsdName)) {
		protocolArray = CFDictionaryGetValue(bsdNameServiceProtocolMapping, bsdName);
	}
	service = SCNetworkServiceCreate(prefs, interface);
	if (service == NULL) {
		SC_log(LOG_INFO, "Could not create new service");
		goto done;
	}

	if (!SCNetworkServiceEstablishDefaultConfiguration(service)) {
		SCNetworkServiceRemove(service);
		SC_log(LOG_INFO, "SCNetworkServiceEstablishDefaultConfiguration() failed");
		goto done;
	}

	if (protocolArray != NULL) {
		CFIndex protocolArrayCount = CFArrayGetCount(protocolArray);

		for (CFIndex idx = 0; idx < protocolArrayCount; idx++) {
			CFDictionaryRef protocolInfo = CFArrayGetValueAtIndex(protocolArray, idx);
			CFDictionaryRef configuration = CFDictionaryGetValue(protocolInfo, kProtocolConfiguration);
			CFStringRef protocolType = CFDictionaryGetValue(protocolInfo, kProtocolType);
			CFBooleanRef cfEnabled = CFDictionaryGetValue(protocolInfo, kProtocolEnabled);
			if (cfEnabled) {
				enabled = CFBooleanGetValue(cfEnabled);
			} else {
				enabled = FALSE;
			}
			__SCNetworkServiceAddProtocolToService(service, protocolType, configuration, enabled);
		}
	}

	// Add Service to current set
	currentSet = SCNetworkSetCopyCurrent(prefs);
	if (currentSet == NULL) {
		SCNetworkServiceRemove(service);
		SC_log(LOG_INFO, "Could not find current set");
		goto done;
	}

	if (!SCNetworkSetAddService(currentSet, service)) {
		SCNetworkServiceRemove(service);
		SC_log(LOG_INFO,  "Could not add service to current set");
		goto done;
	}
done:
	if (service != NULL) {
		CFRelease(service);
	}
	if (currentSet != NULL) {
		CFRelease(currentSet);
	}
}

static void
create_bsd_name_service_protocol_mapping(const void *value, void *context)
{
	SCNetworkConfigurationValidityContext *ctx = (SCNetworkConfigurationValidityContext *)context;
	CFArrayRef interfacePreserveServiceInformation = ctx->interfacePreserveServiceInformation;
	CFMutableDictionaryRef bsdNameServiceProtocolMapping = ctx->bsdNameServiceProtocolPreserveMapping;
	SCNetworkInterfaceRef interface;
	SCNetworkServiceRef service = (SCNetworkServiceRef)value;

	interface = SCNetworkServiceGetInterface(service);

	if (CFArrayContainsValue(interfacePreserveServiceInformation, CFRangeMake(0, CFArrayGetCount(interfacePreserveServiceInformation)), interface)) {
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);
		if (isA_CFString(bsdName)) {

			CFArrayRef protocols = SCNetworkServiceCopyProtocols(service);
			if (protocols != NULL) {
				CFMutableArrayRef protocolArray = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
				CFIndex protocolCount = CFArrayGetCount(protocols);

				for (CFIndex idx = 0; idx < protocolCount; idx++) {
					SCNetworkProtocolRef protocol = CFArrayGetValueAtIndex(protocols, idx);
					CFDictionaryRef configuration = SCNetworkProtocolGetConfiguration(protocol);
					CFStringRef protocolType = SCNetworkProtocolGetProtocolType(protocol);
					Boolean enabled = SCNetworkProtocolGetEnabled(protocol);

					if (configuration == NULL ||  protocolType == NULL) {
						continue;
					}
					CFMutableDictionaryRef protocolInfo = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

					CFDictionaryAddValue(protocolInfo, kProtocolType, protocolType);
					CFDictionaryAddValue(protocolInfo, kProtocolConfiguration, configuration);
					CFDictionaryAddValue(protocolInfo, kProtocolEnabled, enabled ? kCFBooleanTrue : kCFBooleanFalse);
					CFArrayAppendValue(protocolArray, protocolInfo);
					CFRelease(protocolInfo);
				}
				CFDictionaryAddValue(bsdNameServiceProtocolMapping, bsdName, protocolArray);
				CFRelease(protocols);
				CFRelease(protocolArray);
			}

		}
	}
}

static void
remove_service(const void *value, void *context)
{
	SCNetworkConfigurationValidityContext *ctx = (SCNetworkConfigurationValidityContext *)context;
	SCNetworkInterfaceRef interface;
	SCNetworkServiceRef service = (SCNetworkServiceRef)value;
	CFArrayRef toBeRemoved = ctx->interfaceToBeRemoved;

	interface = SCNetworkServiceGetInterface(service);

	if (CFArrayContainsValue(toBeRemoved, CFRangeMake(0, CFArrayGetCount(toBeRemoved)), interface)) {
		SCNetworkServiceRemove(service);
	}
}

static void
_SCNetworkConfigurationSaveOldConfiguration(SCPreferencesRef prefs)
{
	CFAbsoluteTime absoluteTime;
	CFCalendarRef currentCalendar;
	int day;
	int hour;
	CFStringRef keyList[] = {
			kSCPrefCurrentSet,
			MODEL,
			kSCPrefNetworkServices,
			kSCPrefSets,
			kSCPrefSystem,
			kSCPrefVirtualNetworkInterfaces
	};
	CFIndex keyListCount;
	int minute;
	int month;
	int second;
	int year;

	currentCalendar = CFCalendarCopyCurrent();
	absoluteTime = CFAbsoluteTimeGetCurrent();

	if (!CFCalendarDecomposeAbsoluteTime(currentCalendar, absoluteTime, "yMdHms",
					     &year, &month, &day, &hour, &minute, &second)) {
		SC_log(LOG_INFO, "CFCalendarDecomposeAbsoluteTime() failed");
	}
	keyListCount = (CFIndex)sizeof(keyList)/sizeof(CFStringRef);

	for (CFIndex idx = 0; idx < keyListCount; idx++) {
		CFStringRef newKey;
		CFTypeRef value = SCPreferencesGetValue(prefs, keyList[idx]);

		if (value != NULL) {
			newKey = CFStringCreateWithFormat(NULL, NULL,
							  CFSTR("%d-%d-%d %d:%d:%d : %@"),
							  year, month, day, hour,
							  minute, second, keyList[idx]);
			SCPreferencesSetValue(prefs, newKey, value);
			CFRelease(newKey);
		}
	}
	CFRelease(currentCalendar);
}

static Boolean
_SCNetworkConfigurationRepairUsingPreferences(SCPreferencesRef prefs,
					      SCNetworkConfigurationValidityContext *context)
{
	CFIndex removeCount;
	CFIndex replaceCount;
	CFArrayRef serviceList;
	CFArrayRef interfaceToBeRemoved = context->interfaceToBeRemoved;
	CFArrayRef interfaceToBeReplaced = context->interfaceToBeReplaced;

	removeCount = CFArrayGetCount(interfaceToBeRemoved);
	replaceCount = CFArrayGetCount(interfaceToBeReplaced);
	if (removeCount == 0 &&
	    replaceCount == 0) {
		// We don't have any information to repair
		return FALSE;
	}
	// Backup current preferences before making changes
	_SCNetworkConfigurationSaveOldConfiguration(prefs);

	serviceList = SCNetworkServiceCopyAll(prefs);
	CFArrayApplyFunction(serviceList, CFRangeMake(0, CFArrayGetCount(serviceList)), create_bsd_name_service_protocol_mapping, context);
	CFArrayApplyFunction(serviceList, CFRangeMake(0, CFArrayGetCount(serviceList)), remove_service, (void*)context);
	CFArrayApplyFunction(interfaceToBeReplaced, CFRangeMake(0, replaceCount), add_service, (void*)context);
	CFRelease(serviceList);
	return TRUE;
}

static void
validate_bridge(const void *value, void *context)
{
	SCBridgeInterfaceRef bridge = (SCBridgeInterfaceRef) value;
	CFArrayRef memberInterfaces = SCBridgeInterfaceGetMemberInterfaces(bridge);
	CFMutableArrayRef memberInterfacesMutable = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	SCPreferencesRef ni_prefs = (SCPreferencesRef)context;

	for (CFIndex idx = 0; idx < CFArrayGetCount(memberInterfaces); idx++) {
		CFStringRef bsdName;
		SCNetworkInterfaceRef interface = (SCNetworkInterfaceRef)CFArrayGetValueAtIndex(memberInterfaces, idx);
		SCNetworkInterfaceRef memberInterface;

		bsdName = SCNetworkInterfaceGetBSDName(interface);
		if (bsdName == NULL) {
			continue;
		}

		// Check if member interface is present
		memberInterface = __SCNetworkInterfaceCreateWithNIPreferencesUsingBSDName(NULL, ni_prefs, bsdName);
		if (memberInterface != NULL) {
			CFArrayAppendValue(memberInterfacesMutable, memberInterface);
			CFRelease(memberInterface);
		}
	}

	if (CFArrayGetCount(memberInterfacesMutable) == 0) {
		SC_log(LOG_INFO, "Removing invalid bridge configuration: %@", bridge);
		SCBridgeInterfaceRemove(bridge);
	}
	else {
		SCBridgeInterfaceSetMemberInterfaces(bridge, memberInterfacesMutable);
	}
	CFRelease(memberInterfacesMutable);
}
#if	!TARGET_OS_IPHONE
static void
validate_bond(const void *value, void *context)
{
	SCBondInterfaceRef bond = (SCBondInterfaceRef)value;
	CFArrayRef memberInterfaces = SCBondInterfaceGetMemberInterfaces(bond);
	CFMutableArrayRef memberInterfacesMutable = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	SCPreferencesRef ni_prefs = (SCPreferencesRef)context;

	for (CFIndex idx = 0; idx < CFArrayGetCount(memberInterfaces); idx++) {
		CFStringRef bsdName;
		SCNetworkInterfaceRef interface = (SCNetworkInterfaceRef)CFArrayGetValueAtIndex(memberInterfaces, idx);
		SCNetworkInterfaceRef memberInterface;

		bsdName = SCNetworkInterfaceGetBSDName(interface);
		if (bsdName == NULL) {
			continue;
		}

		// Check if member interface is present
		memberInterface = __SCNetworkInterfaceCreateWithNIPreferencesUsingBSDName(NULL, ni_prefs, bsdName);
		if (memberInterface != NULL) {
			CFArrayAppendValue(memberInterfacesMutable, memberInterface);
			CFRelease(memberInterface);
		}
	}

	if (CFArrayGetCount(memberInterfacesMutable) == 0) {
		SC_log(LOG_INFO, "Removing invalid bond configuration: %@", bond);
		SCBondInterfaceRemove(bond);
	}
	else {
		SCBondInterfaceSetMemberInterfaces(bond, memberInterfacesMutable);
	}
	CFRelease(memberInterfacesMutable);
}
#endif

static void
validate_vlan(const void *value, void *context)
{
	CFStringRef bsdName;
	SCNetworkInterfaceRef interface;
	Boolean isValid = TRUE;
	SCPreferencesRef ni_prefs = (SCPreferencesRef)context;
	SCNetworkInterfaceRef physicalInterface;
	SCVLANInterfaceRef vlan = (SCVLANInterfaceRef)value;

	physicalInterface = SCVLANInterfaceGetPhysicalInterface(vlan);
	bsdName = SCNetworkInterfaceGetBSDName(physicalInterface);

	if (bsdName == NULL) {
		isValid = FALSE;
		goto done;
	}

	// Check if the physical interface is present
	interface = __SCNetworkInterfaceCreateWithNIPreferencesUsingBSDName(NULL, ni_prefs, bsdName);
	if (interface == NULL) {
		isValid = FALSE;
		goto done;
	}
	CFRelease(interface);

done:
	if (!isValid) {
		SC_log(LOG_INFO, "Removing invalid VLAN configuration: %@", vlan);
		SCVLANInterfaceRemove(vlan);
	}
}

Boolean
_SCNetworkConfigurationCheckValidityWithPreferences(SCPreferencesRef prefs,
						     SCPreferencesRef ni_prefs,
						     CFDictionaryRef options)
{
	CFArrayRef allServices = NULL;
	CFArrayRef allSets = NULL;
	CFDictionaryRef bsdNameToBridgeServices = NULL;
	CFDictionaryRef bsdNameToBondServices = NULL;
	CFDictionaryRef bsdNameToVLANServices = NULL;
	SCNetworkConfigurationValidityContext context;
	CFArrayRef interfaces = NULL;
	CFMutableArrayRef interfaceToBeRemoved = NULL;
	CFMutableArrayRef interfaceToBeReplaced = NULL;
	CFMutableArrayRef interfacePreserveServiceInformation = NULL;
	CFMutableDictionaryRef bsdNameServiceProtocolPreserveMapping = NULL;
	Boolean isValid = TRUE;
	CFDictionaryRef mappingBSDNameToInterface = NULL;
	CFDictionaryRef mappingServiceBSDNameToInterface = NULL;
	CFStringRef  model = NULL;
	CFStringRef ni_model = NULL;
	Boolean repairConfiguration = FALSE;
	Boolean revertLimitNetworkConfiguration = FALSE;
	CFArrayRef setServiceOrder = NULL;
	CFArrayRef setServices = NULL;

	if  ((isA_CFDictionary(options) != NULL)) {
		CFBooleanRef repair = CFDictionaryGetValue(options, kSCNetworkConfigurationRepair);
		if (isA_CFBoolean(repair) != NULL) {
			repairConfiguration = CFBooleanGetValue(repair);
		}
	}
	if (!__SCPreferencesGetLimitSCNetworkConfiguration(prefs)) {
		__SCPreferencesSetLimitSCNetworkConfiguration(prefs, TRUE);
		revertLimitNetworkConfiguration = TRUE;
	}
	/*

	 Check the validity by:
	 - Comparing if the models are the same
	 */
	model = SCPreferencesGetValue(prefs, MODEL);
	ni_model = SCPreferencesGetValue(ni_prefs, MODEL);

	if (isA_CFString(model) == NULL || isA_CFString(ni_model) == NULL || CFStringCompare(model, ni_model, 0) != kCFCompareEqualTo) {
		isValid = FALSE;
		SC_log(LOG_INFO, "Model names do not match in preferences.plist and NetworkInterfaces.plist");
		goto done;
	}

	/*
	 - Comparing if the interfaces names mentioned in NetworkInterfaces.plist and preferences.plist match
	 Use the functions
	 CFDictionaryRef
	 __SCNetworkInterfaceCreateMappingUsingBSDName(SCPreferencesRef prefs);
	 */
	interfaces = __SCNetworkInterfaceCopyStoredWithPreferences(ni_prefs);
	if (isA_CFArray(interfaces) == NULL) {
		SC_log(LOG_NOTICE, "No interfaces");
		isValid = FALSE;
		goto done;
	}
	mappingBSDNameToInterface = __SCNetworkInterfaceCreateMappingUsingBSDName(interfaces);
	CFRelease(interfaces);
	if (isA_CFDictionary(mappingBSDNameToInterface) == NULL) {
		isValid = FALSE;
		SC_log(LOG_INFO, "No BSD name to interface mapping");
		goto done;
	}

	interfaces = __SCNetworkServiceCopyAllInterfaces(prefs);
	if (isA_CFArray(interfaces) == NULL) {
		isValid = FALSE;
		SC_log(LOG_INFO, "No interfaces");
		goto done;
	}
	mappingServiceBSDNameToInterface = __SCNetworkInterfaceCreateMappingUsingBSDName(interfaces);
	CFRelease(interfaces);
	if (isA_CFDictionary(mappingServiceBSDNameToInterface) == NULL) {
		isValid = FALSE;
		SC_log(LOG_INFO, "No Service BSD name to interface mapping");
		goto done;
	}

	if (repairConfiguration) {
		interfaceToBeRemoved = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		interfaceToBeReplaced = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		interfacePreserveServiceInformation = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		bsdNameServiceProtocolPreserveMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
#if	!TARGET_OS_IPHONE
		bsdNameToBridgeServices = _SCNetworkMigrationCopyMappingBSDNameToBridgeServices(prefs);
		bsdNameToBondServices = _SCNetworkMigrationCopyMappingBSDNameToBondServices(prefs);
		bsdNameToVLANServices = _SCNetworkMigrationCopyMappingBSDNameToVLANServices(prefs);
#endif
	}
	context.interfaceMapping = mappingBSDNameToInterface;
	context.isValid = &isValid;
	context.interfaceToBeRemoved = interfaceToBeRemoved;
	context.interfaceToBeReplaced = interfaceToBeReplaced;
	context.interfacePreserveServiceInformation = interfacePreserveServiceInformation;
	context.bsdNameToBridgeServices = bsdNameToBridgeServices;
	context.bsdNameToBondServices = bsdNameToBondServices;
	context.bsdNameToVLANServices = bsdNameToVLANServices;
	context.repair = repairConfiguration;
	context.prefs = prefs;
	context.bsdNameServiceProtocolPreserveMapping = bsdNameServiceProtocolPreserveMapping;

	CFDictionaryApplyFunction(mappingServiceBSDNameToInterface, _SCNetworkConfigurationValidateInterface, &context);

	if (!isValid) {
		SC_log(LOG_INFO, "mismatch between interface names in NetworkInterfaces.plist and preferences.plist");
		if (repairConfiguration) {
			isValid = _SCNetworkConfigurationRepairUsingPreferences(prefs, &context);
			if (!isValid) {
				goto done;
			}
			// Save the changes if repair fixed an invalid configuration
			if (!SCPreferencesCommitChanges(prefs)) {
				SC_log(LOG_INFO, "SCPreferencesCommitChanges() failed");
			}
		}
		else {
			goto done;
		}
	}
	/*
	 - Check if all the network services mentioned in the SCNetworkSet are actually present in the SCNetworkService array
	 */

	allServices = SCNetworkServiceCopyAll(prefs);
	if (isA_CFArray(allServices) == NULL) {
		isValid = FALSE;
		SC_log(LOG_INFO, "No services");
		goto done;
	}

	allSets = SCNetworkSetCopyAll(prefs);
	if (isA_CFArray(allSets) == NULL) {
		isValid = FALSE;
		SC_log(LOG_INFO, "No sets");
		goto done;
	}

	for (CFIndex idx = 0; ((idx < CFArrayGetCount(allSets)) && isValid); idx++) {
		SCNetworkSetRef set = CFArrayGetValueAtIndex(allSets, idx);

		if (isA_SCNetworkSet(set) == NULL) {
			SC_log(LOG_INFO, "No set");
			continue;
		}
		setServices = SCNetworkSetCopyServices(set);
		if (setServices == NULL) {
			SC_log(LOG_INFO, "No services");
			continue;
		}
		for (CFIndex idx2 = 0; idx2 < CFArrayGetCount(setServices); idx2++) {
			SCNetworkServiceRef service = CFArrayGetValueAtIndex(setServices, idx2);

			if (!CFArrayContainsValue(allServices, CFRangeMake(0, CFArrayGetCount(allServices)), service)) {
				isValid = FALSE;
				SC_log(LOG_INFO, "All network services in the network set are not present in SCNetworkService array");
				break;
			}
		}
		if (!isValid) {
			break;
		}

		/*
		 - Check if service IDs in service order do exist in the SET
		 */
		setServiceOrder = SCNetworkSetGetServiceOrder(set);
		if (setServiceOrder != NULL) {
			for (CFIndex idx2 = 0; idx2 < CFArrayGetCount(setServiceOrder); idx2++) {
				SCNetworkServiceRef service = CFArrayGetValueAtIndex(setServiceOrder, idx2);
				if (!CFArrayContainsValue(setServiceOrder, CFRangeMake(0, CFArrayGetCount(setServiceOrder)), service) &&
				    !CFArrayContainsValue(allServices, CFRangeMake(0, CFArrayGetCount(allServices)), service)) {
					SC_log(LOG_INFO, "Service: %@ is not present in the service order for set %@", service, set);
					break;
				}
			}
		}
		if (setServices != NULL) {
			CFRelease(setServices);
			setServices = NULL;
		}
	}

	/*
	 - Check if the virtual network interfaces have valid member interfaces
	 */
	CFArrayRef bridges = SCBridgeInterfaceCopyAll(prefs);
	if (bridges != NULL) {
		CFArrayApplyFunction(bridges, CFRangeMake(0, CFArrayGetCount(bridges)), validate_bridge, (void*)ni_prefs);
		CFRelease(bridges);
	}
#if	!TARGET_OS_IPHONE
	CFArrayRef bonds = SCBondInterfaceCopyAll(prefs);
	if (bonds != NULL) {
		CFArrayApplyFunction(bonds, CFRangeMake(0, CFArrayGetCount(bonds)), validate_bond, (void*)ni_prefs);
		CFRelease(bonds);
	}
#endif
	CFArrayRef vlans = SCVLANInterfaceCopyAll(prefs);
	if (vlans != NULL) {
		CFArrayApplyFunction(vlans, CFRangeMake(0, CFArrayGetCount(vlans)), validate_vlan, (void*)ni_prefs);
		CFRelease(vlans);
	}


done:
	if (mappingBSDNameToInterface != NULL) {
		CFRelease(mappingBSDNameToInterface);
	}
	if (mappingServiceBSDNameToInterface != NULL) {
		CFRelease(mappingServiceBSDNameToInterface);
	}
	if (allServices != NULL) {
		CFRelease(allServices);
	}
	if (allSets != NULL) {
		CFRelease(allSets);
	}
#if	!TARGET_OS_IPHONE
	if (bsdNameToBridgeServices != NULL) {
		CFRelease(bsdNameToBridgeServices);
	}
	if (bsdNameToBondServices != NULL) {
		CFRelease(bsdNameToBondServices);
	}
	if (bsdNameToVLANServices != NULL) {
		CFRelease(bsdNameToVLANServices);
	}
#endif
	if (setServices != NULL) {
		CFRelease(setServices);
	}
	if (interfaceToBeRemoved != NULL) {
		CFRelease(interfaceToBeRemoved);
	}
	if (interfaceToBeReplaced != NULL) {
		CFRelease(interfaceToBeReplaced);
	}
	if (interfacePreserveServiceInformation != NULL) {
		CFRelease(interfacePreserveServiceInformation);
	}
	if (bsdNameServiceProtocolPreserveMapping != NULL) {
		CFRelease(bsdNameServiceProtocolPreserveMapping);
	}
	if (revertLimitNetworkConfiguration) {
		__SCPreferencesSetLimitSCNetworkConfiguration(prefs, FALSE);
	}
	return isValid;
}

Boolean
_SCNetworkConfigurationCheckValidity(CFURLRef configDir, CFDictionaryRef options)
{
	CFURLRef baseURL = NULL;
	CFURLRef configNetworkInterfaceFile = NULL;
	CFStringRef configNetworkInterfaceFileString = NULL;
	SCPreferencesRef configNetworkInterfacePref = NULL;
	SCPreferencesRef configPref = NULL;
	CFURLRef configPreferenceFile = NULL;
	CFStringRef configPreferencesFileString = NULL;
	Boolean isValid = FALSE;
	char networkInterfaceStr[PATH_MAX];
	char prefsStr[PATH_MAX];

	if (configDir == NULL) {
		SC_log(LOG_INFO, "Migration files not found in directory: %@",
		       (configDir == NULL) ? CFSTR("NULL") : CFURLGetString(configDir));
		goto done;
	}
	baseURL = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE,
							      kCFURLPOSIXPathStyle, TRUE, configDir);

	configPreferenceFile = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)PREFS_DEFAULT_CONFIG_PLIST, sizeof(PREFS_DEFAULT_CONFIG_PLIST), FALSE, baseURL);
	configNetworkInterfaceFile = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)NETWORK_INTERFACES_PREFS_PLIST, sizeof(NETWORK_INTERFACES_PREFS_PLIST), FALSE, baseURL);

	if (!CFURLGetFileSystemRepresentation(configPreferenceFile, TRUE, (UInt8*)prefsStr, sizeof(prefsStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configPreferenceFile);
		goto done;
	}
	if (!CFURLGetFileSystemRepresentation(configNetworkInterfaceFile, TRUE, (UInt8*)networkInterfaceStr, sizeof(networkInterfaceStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configNetworkInterfaceFile);
		goto done;
	}

	configPreferencesFileString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), prefsStr);
	configNetworkInterfaceFileString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), networkInterfaceStr);

	configPref = SCPreferencesCreate(NULL,
					 PLUGIN_ID,
					 configPreferencesFileString);

	configNetworkInterfacePref = SCPreferencesCreate(NULL,
							 PLUGIN_ID,
							 configNetworkInterfaceFileString);
	if ((configPref == NULL) || (configNetworkInterfacePref == NULL)) {
		goto done;
	}

	// This function compares preferences.plist and NetworkInterfaces.plist and verifies if the values are correct
	// Checking interface mismatch for validity
	isValid = _SCNetworkConfigurationCheckValidityWithPreferences(configPref, configNetworkInterfacePref, options);

done:
	if (baseURL != NULL) {
		CFRelease(baseURL);
	}
	if (configPreferencesFileString != NULL) {
		CFRelease(configPreferencesFileString);
	}
	if (configNetworkInterfaceFileString != NULL) {
		CFRelease(configNetworkInterfaceFileString);
	}
	if (configPref != NULL) {
		CFRelease(configPref);
	}
	if (configNetworkInterfacePref != NULL) {
		CFRelease(configNetworkInterfacePref);
	}
	if (configPreferenceFile != NULL) {
		CFRelease(configPreferenceFile);
	}
	if (configNetworkInterfaceFile != NULL) {
		CFRelease(configNetworkInterfaceFile);
	}
	return isValid;
}


typedef struct {
	CFMutableArrayRef externalInterfaceList;
	CFMutableArrayRef networkInterfaceList;
	Boolean foundNewInterfaces;
} SCExternalMappingContext;

static void
_SCNetworkConfigurationCollectInterfaceStorageEntity(const void *key, const void *value, void *context)
{
	SCExternalMappingContext* ctx = context;
	CFDictionaryRef interface_entity = NULL;
	SCNetworkInterfaceRef targetInterface = (SCNetworkInterfaceRef)value;

	if (CFArrayContainsValue(ctx->externalInterfaceList, CFRangeMake(0, CFArrayGetCount(ctx->externalInterfaceList)), targetInterface)) {
		SC_log(LOG_INFO, "Target interface (%@) already exists, not adding to NetworkInterfaces.plist", targetInterface);
		return; // If the target interface already exists then do not add it to NetworkInterfaces.plist
	}
	ctx->foundNewInterfaces = TRUE;
	interface_entity = __SCNetworkInterfaceCopyStorageEntity(targetInterface);

	if (interface_entity != NULL) {
		CFArrayAppendValue(ctx->networkInterfaceList, interface_entity);
		CFRelease(interface_entity);
	}
}

static CFArrayRef   // CFDictionaryRef
_SCNetworkMigrationCreateNetworkInterfaceArray(SCPreferencesRef ni_prefs, CFDictionaryRef externalMapping, Boolean *hasNewInterface)
{
	SCExternalMappingContext context;
	CFIndex count = 0;
	CFMutableArrayRef externalInterfaceList = NULL;
	CFArrayRef if_list = NULL;
	CFDictionaryRef interface_entity = NULL;
	CFMutableArrayRef networkInterfaceList = NULL;

	if (ni_prefs == NULL) {
		SC_log(LOG_INFO, "No NetworkInterfaces.plist");
		return NULL;
	}

	if_list = SCPreferencesGetValue(ni_prefs, INTERFACES);

	if ((isA_CFArray(if_list) == NULL) ||
	    ((count = CFArrayGetCount(if_list)) == 0)) {
		SC_log(LOG_INFO, "No interfaces");
		return NULL;
	}

	networkInterfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	// Keep the same builtin and external interfaces
	for (CFIndex idx = 0; idx < count; idx++) {
		interface_entity = CFArrayGetValueAtIndex(if_list, idx);
		if (isA_CFDictionary(interface_entity) == NULL) {
			continue;
		}
		CFArrayAppendValue(networkInterfaceList, interface_entity);
	}

	if (isA_CFDictionary(externalMapping) == NULL) {
		SC_log(LOG_INFO, "No external mapping");
		goto done;
	}
	// Add any new external interfaces found
	externalInterfaceList = _SCNetworkInterfaceCopyInterfacesFilteredByBuiltinWithPreferences(ni_prefs, FALSE);
	context.externalInterfaceList = externalInterfaceList;
	context.networkInterfaceList = networkInterfaceList;
	context.foundNewInterfaces = FALSE;

	CFDictionaryApplyFunction(externalMapping, _SCNetworkConfigurationCollectInterfaceStorageEntity, &context);

	if (hasNewInterface != NULL) {
		*hasNewInterface = context.foundNewInterfaces;
	}
done:
	if (externalInterfaceList != NULL) {
		CFRelease(externalInterfaceList);
	}
	return networkInterfaceList;
}

static void
SCNetworkMigrationMapSourceToTargetName(const void *key, const void *value, void *context)
{
	SCNetworkInterfaceRef interfaceKey = (SCNetworkInterfaceRef)key;
	SCNetworkInterfaceRef interfaceValue = (SCNetworkInterfaceRef)value;
	CFMutableDictionaryRef mapping = (CFMutableDictionaryRef)context;
	CFStringRef sourceBSDName = NULL;
	CFStringRef targetBSDName = NULL;

	sourceBSDName = SCNetworkInterfaceGetBSDName(interfaceKey);
	if (isA_CFString(sourceBSDName) == NULL) {
		return;
	}

	targetBSDName = SCNetworkInterfaceGetBSDName(interfaceValue);
	if (isA_CFString(targetBSDName) == NULL) {
		return;
	}

	if (!CFDictionaryContainsKey(mapping, sourceBSDName)) {
		CFDictionaryAddValue(mapping, sourceBSDName, targetBSDName);
	}
	return;
}

static CFDictionaryRef
_SCNetworkMigrationCreateBSDNameMapping(CFDictionaryRef internalMapping, CFDictionaryRef externalMapping)
{
	CFMutableDictionaryRef bsdNameMapping = CFDictionaryCreateMutable(NULL, 0,
									  &kCFTypeDictionaryKeyCallBacks,
									  &kCFTypeDictionaryValueCallBacks);

	if ((internalMapping == NULL) && externalMapping == NULL) {
		goto done;
	}

	if (internalMapping != NULL) {
		CFDictionaryApplyFunction(internalMapping, SCNetworkMigrationMapSourceToTargetName, bsdNameMapping);
	}

	if (externalMapping != NULL) {
		CFDictionaryApplyFunction(externalMapping, SCNetworkMigrationMapSourceToTargetName, bsdNameMapping);
	}

done:
	return bsdNameMapping;
}

typedef struct {
	CFMutableArrayRef mutableServiceArray;
	SCPreferencesRef prefs;
} SCNetworkServiceArrayCopyContext;

static CFDictionaryRef
_SCNetworkMigrationCreateServiceSetMapping(SCPreferencesRef prefs)
{
	CFMutableDictionaryRef serviceSetMapping = CFDictionaryCreateMutable(NULL, 0,
									     &kCFTypeDictionaryKeyCallBacks,
									     &kCFTypeDictionaryValueCallBacks);
	SCNetworkServiceRef service = NULL;
	CFArrayRef services = NULL;
	CFMutableArrayRef setList = NULL;
	CFArrayRef sets = NULL;

	services = SCNetworkServiceCopyAll(prefs);
	if (services == NULL) {
		goto done;
	}
	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		service = CFArrayGetValueAtIndex(services, idx);

		if (!CFDictionaryContainsKey(serviceSetMapping, service)) {
			setList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
			CFDictionaryAddValue(serviceSetMapping, service, setList);
			CFRelease(setList);
		}
	}
	CFRelease(services);

	sets = SCNetworkSetCopyAll(prefs);
	if (sets == NULL) {
		goto done;
	}

	for (CFIndex idx = 0; idx < CFArrayGetCount(sets); idx++) {
		SCNetworkSetRef set = CFArrayGetValueAtIndex(sets, idx);
		services = SCNetworkSetCopyServices(set);

		for (CFIndex idx2 = 0; idx2 < CFArrayGetCount(services); idx2++) {
			service = CFArrayGetValueAtIndex(services, idx2);
			setList = (CFMutableArrayRef)CFDictionaryGetValue(serviceSetMapping, service);
			if (setList != NULL) {
				CFArrayAppendValue(setList, set);
			}
		}
		CFRelease(services);
	}

done:
	if (sets != NULL) {
		CFRelease(sets);
	}
	return serviceSetMapping;
}

static CFDictionaryRef
_SCNetworkMigrationCreateSetMapping(SCPreferencesRef sourcePrefs,
				    SCPreferencesRef targetPrefs)
{
	SCNetworkSetRef currentSourceSet = NULL;
	CFMutableDictionaryRef setMapping = NULL;
	CFStringRef setName;
	CFArrayRef sourceSets = NULL;
	CFIndex targetCount;
	SCNetworkSetRef targetSet;
	CFArrayRef targetSets = NULL;
	CFMutableArrayRef targetSetsMutable = NULL;

	sourceSets = SCNetworkSetCopyAll(sourcePrefs);
	targetSets = SCNetworkSetCopyAll(targetPrefs);

	if (sourceSets == NULL ||
	    targetSets == NULL) {
		goto done;
	}
	targetSetsMutable = CFArrayCreateMutableCopy(NULL, 0, targetSets);
	targetCount = CFArrayGetCount(targetSetsMutable);

	setMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	currentSourceSet = SCNetworkSetCopyCurrent(sourcePrefs);

	// Mapping the current source set to the first target set, and setting it as current set
	if (currentSourceSet != NULL) {
		if (targetCount > 0) {
			targetSet = CFArrayGetValueAtIndex(targetSetsMutable, 0);
			CFRetain(targetSet);
			CFArrayRemoveValueAtIndex(targetSetsMutable, 0);

			setName = SCNetworkSetGetName(currentSourceSet);
			SCNetworkSetSetName(targetSet, setName);
			CFDictionaryAddValue(setMapping, currentSourceSet, targetSet);
			SCNetworkSetSetCurrent(targetSet);
			CFRelease(targetSet);
		}
		else {
			SC_log(LOG_ERR, "Number of sets in the target should be at least 1, but is found to be %ld", targetCount);
			goto done;
		}
	}

	for (CFIndex idx = 0; idx < CFArrayGetCount(sourceSets); idx++) {
		SCNetworkSetRef sourceSet = CFArrayGetValueAtIndex(sourceSets, idx);

		if ((currentSourceSet != NULL) && CFEqual(sourceSet, currentSourceSet)) {
			continue;
		}

		targetCount = CFArrayGetCount(targetSetsMutable);
		setName = SCNetworkSetGetName(sourceSet);

		if (targetCount > 0) {
			targetSet = CFArrayGetValueAtIndex(targetSetsMutable, 0);
			CFRetain(targetSet);
			CFArrayRemoveValueAtIndex(targetSetsMutable, 0);
		}
		else {
			targetSet = SCNetworkSetCreate(targetPrefs);
		}
		SCNetworkSetSetName(targetSet, setName);
		CFDictionaryAddValue(setMapping, sourceSet, targetSet);

		CFRelease(targetSet);
	}

done:
	if (sourceSets != NULL) {
		CFRelease(sourceSets);
	}
	if (targetSets != NULL) {
		CFRelease(targetSets);
	}
	if (targetSetsMutable != NULL) {
		CFRelease(targetSetsMutable);
	}
	if (currentSourceSet != NULL) {
		CFRelease(currentSourceSet);
	}

	if (setMapping != NULL) {
		SC_log(LOG_NOTICE, "Set mapping: %@", setMapping);
	} else {
		SC_log(LOG_INFO, "Set mapping: NULL");
	}

	return setMapping;
}

// This function finds the mapping between source and target preferences (SCNetworkServicesRef -> SCNetworkServicesRef)
// If there is no mapping found between source and target preferences, then the CFBooleanRef value indicating no value is found is stored (SCNetworkServicesRef -> kCFBooleanFalse)
static CFDictionaryRef
_SCNetworkMigrationCreateServiceMappingUsingBSDMapping(SCPreferencesRef sourcePrefs,
						       SCPreferencesRef targetPrefs,
						       CFDictionaryRef bsdNameMapping)
{
	CFStringRef bsdNameMapTarget = NULL;
	CFMutableDictionaryRef serviceMapping = NULL;                               // Mapping of services between source and target configurations
	CFStringRef sourceBSDName = NULL;
	CFIndex sourceCount = 0;
	SCNetworkInterfaceRef sourceInterface = NULL;
	CFStringRef sourceInterfaceSubType = NULL;		// Check interface type and subtype to be able to transfer VPN
	CFStringRef sourceInterfaceType = NULL;
	CFArrayRef sourceSCNetworkServices = NULL;
	CFMutableArrayRef sourceSCNetworkServicesMutable = NULL;                    // Source SCNetworkServiceRef mutable array
	SCNetworkServiceRef sourceService = NULL;
	CFStringRef targetBSDName = NULL;
	CFIndex targetCount = 0;                                   // Count of Source and Target Services
	SCNetworkInterfaceRef targetInterface = NULL;
	CFStringRef targetInterfaceSubType = NULL;		// services during migration
	CFStringRef targetInterfaceType = NULL;
	CFArrayRef targetSCNetworkServices = NULL;
	CFMutableArrayRef targetSCNetworkServicesMutable = NULL;                    // Target SCNetworkServiceRef mutable array
	SCNetworkServiceRef targetService = NULL;

	// We need BSD Mapping to successfully create service mapping
	if (bsdNameMapping == NULL) {
		SC_log(LOG_INFO, "No BSD name mapping");
		goto done;
	}
	sourceSCNetworkServices = SCNetworkServiceCopyAll(sourcePrefs);
	if (isA_CFArray(sourceSCNetworkServices) == NULL) {
		SC_log(LOG_INFO, "No source network services");
		goto done;
	}
	targetSCNetworkServices = SCNetworkServiceCopyAll(targetPrefs);
	if (isA_CFArray(targetSCNetworkServices) == NULL) {
		SC_log(LOG_INFO, "No target network services");
		goto done;
	}

	sourceCount = CFArrayGetCount(sourceSCNetworkServices);

	sourceSCNetworkServicesMutable = CFArrayCreateMutableCopy(NULL, 0, sourceSCNetworkServices);
	targetSCNetworkServicesMutable = CFArrayCreateMutableCopy(NULL, 0, targetSCNetworkServices);

	serviceMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	for (CFIndex idx = 0;  idx < sourceCount; idx++) {
		sourceBSDName = NULL;
		sourceService = NULL;
		sourceInterface = NULL;
		sourceInterfaceType = NULL;
		sourceInterfaceSubType = NULL;
		bsdNameMapTarget = NULL;

		targetCount = CFArrayGetCount(targetSCNetworkServicesMutable);
		sourceService = (SCNetworkServiceRef) CFArrayGetValueAtIndex(sourceSCNetworkServicesMutable, idx);

		sourceInterface = SCNetworkServiceGetInterface(sourceService);
		if (sourceInterface == NULL) {
			SC_log(LOG_INFO, "No source interface");
			continue;
		}

		sourceInterfaceType = __SCNetworkInterfaceGetEntityType(sourceInterface);
		if ((isA_CFString(sourceInterfaceType) != NULL) &&
		    (CFEqual(sourceInterfaceType, kSCValNetInterfaceTypeVPN) ||
		     CFEqual(sourceInterfaceType, kSCValNetInterfaceTypePPP))) {
			    sourceInterfaceSubType = __SCNetworkInterfaceGetEntitySubType(sourceInterface);
			    if (isA_CFString(sourceInterfaceSubType) == NULL) {
				    SC_log(LOG_INFO, "No source interface SubType");
				    continue;
			    }
		}
		else if ((isA_CFString(sourceInterfaceType) &&
			  !CFEqual(sourceInterfaceType, kSCValNetInterfaceTypeIPSec) &&
			  !CFEqual(sourceInterfaceType, kSCValNetInterfaceType6to4) &&
			  !CFEqual(sourceInterfaceType, kSCValNetInterfaceTypeLoopback)) ||
			 !isA_CFString(sourceInterfaceType)) {
			sourceBSDName = SCNetworkInterfaceGetBSDName(sourceInterface);
			if (!isA_CFString(sourceBSDName) ||
			    !CFDictionaryContainsKey(bsdNameMapping, sourceBSDName)) {
				SC_log(LOG_INFO, "No BSD name mapping for %@",
				       (sourceBSDName == NULL) ? CFSTR("NULL") : sourceBSDName);
				continue;
			}

			bsdNameMapTarget = CFDictionaryGetValue(bsdNameMapping, sourceBSDName);
			if (isA_CFString(bsdNameMapTarget) == NULL) {
				SC_log(LOG_INFO, "No BSD name mapping target");
				continue;
			}
		}
		// Find the bsd name in target service
		for (CFIndex idx2 = 0; idx2 < targetCount; idx2++) {
			targetService = NULL;
			targetInterface = NULL;
			targetBSDName = NULL;
			targetInterfaceType = NULL;
			targetInterfaceSubType = NULL;

			targetService = (SCNetworkServiceRef) CFArrayGetValueAtIndex(targetSCNetworkServicesMutable, idx2);

			targetInterface = SCNetworkServiceGetInterface(targetService);
			if (targetInterface == NULL) {
				SC_log(LOG_INFO, "No target interface");
				continue;
			}
			SC_log(LOG_INFO, "targetInterface: %@", targetInterface);
			if (sourceBSDName != NULL) {
				targetBSDName = SCNetworkInterfaceGetBSDName(targetInterface);
				if (isA_CFString(targetBSDName) == NULL) {
					SC_log(LOG_INFO, "No target BSD name");
					continue;
				}

				if (CFEqual(targetBSDName, bsdNameMapTarget)) {
					SC_log(LOG_INFO, "Removing target BSD name: %@", targetBSDName);
					CFDictionaryAddValue(serviceMapping, sourceService, targetService);
					CFArrayRemoveValueAtIndex(targetSCNetworkServicesMutable, idx2);
					break;
				}
			}
			else {
				// Source Interface Type should be VPN
				targetInterfaceType = __SCNetworkInterfaceGetEntityType(targetInterface);
				if ((isA_CFString(targetInterfaceType) == NULL) ||
				    (!CFEqual(targetInterfaceType, kSCValNetInterfaceTypeVPN) &&
				     !CFEqual(targetInterfaceType, kSCValNetInterfaceTypePPP))) {
					    SC_log(LOG_INFO, "Unexpected target interface type: %@",
						   (targetInterfaceType != NULL) ? targetInterfaceType : CFSTR("NULL"));
					    continue;
				    }
				targetInterfaceSubType = __SCNetworkInterfaceGetEntitySubType(targetInterface);
				if (isA_CFString(targetInterfaceSubType) == NULL) {
					SC_log(LOG_INFO, "No target interface SubType");
					continue;
				}

				// Check if the target interface type and the target interface sub type match
				if (CFEqual(targetInterfaceType, sourceInterfaceType) &&
				    CFEqual(targetInterfaceSubType, sourceInterfaceSubType)) {
					SC_log(LOG_INFO, "Removing target BSD Name: %@ for VPN", targetBSDName);
					CFDictionaryAddValue(serviceMapping, sourceService, targetService);
					CFArrayRemoveValueAtIndex(targetSCNetworkServicesMutable, idx2);
					break;
				}
			}
		}
		// Check if sourceService has found a mapping or not, if not the create a NULL mapping to indicate
		// the this service needs to be added and not replaced
		if (!CFDictionaryContainsKey(serviceMapping, sourceService)) {
			SC_log(LOG_INFO, "Service needs to be added: %@", sourceService);
			CFDictionaryAddValue(serviceMapping, sourceService, kCFBooleanFalse);
		}
	}
done:
	if (sourceSCNetworkServices != NULL) {
		CFRelease(sourceSCNetworkServices);
	}
	if (targetSCNetworkServices != NULL) {
		CFRelease(targetSCNetworkServices);
	}
	if (sourceSCNetworkServicesMutable != NULL) {
		CFRelease(sourceSCNetworkServicesMutable);
	}
	if (targetSCNetworkServicesMutable != NULL) {
		CFRelease(targetSCNetworkServicesMutable);
	}

	if (serviceMapping != NULL) {
		SC_log(LOG_NOTICE, "Service mapping: %@", serviceMapping);
	} else {
		SC_log(LOG_INFO, "Service mapping: NULL");
	}

	return serviceMapping;
}

typedef struct {
	SCPreferencesRef targetPrefs;
	CFDictionaryRef bsdMapping;
	CFDictionaryRef setMapping;
	CFDictionaryRef serviceSetMapping;
} ServiceMigrationContext;

// value can be:
//	SCNetworkServiceRef: if target service needs replacement
//	CFBooleanRef: if target service is not present
static void
ServiceMigrationAddOrReplace(const void *key, const void *value, void *context)
{
	CFDictionaryRef bsdMapping = NULL;
	ServiceMigrationContext *ctx = (ServiceMigrationContext*)context;
	CFDictionaryRef setMapping;
	CFDictionaryRef sourceServiceSetMapping;
	SCNetworkServiceRef sourceService = (SCNetworkServiceRef)key;
	SCPreferencesRef targetPrefs = NULL;
	SCNetworkServiceRef targetService = (SCNetworkServiceRef)value;

	targetPrefs = ctx->targetPrefs;
	bsdMapping = ctx->bsdMapping;
	setMapping = ctx->setMapping;
	sourceServiceSetMapping = ctx->serviceSetMapping;

	if ((setMapping != NULL || sourceServiceSetMapping != NULL)) {
		if (isA_SCNetworkService(targetService) != NULL) {
			SC_log(LOG_INFO, "Removing target service: %@", targetService);
			SCNetworkServiceRemove(targetService);
		}
	}
	SC_log(LOG_INFO, "Adding service: %@", sourceService);
	if (__SCNetworkServiceMigrateNew(targetPrefs, sourceService, bsdMapping, setMapping, sourceServiceSetMapping) ==  FALSE) {
		SC_log(LOG_INFO, "Could not add service: %@", sourceService);
	}
}

static Boolean
_SCNetworkMigrationDoServiceMigration(SCPreferencesRef sourcePrefs, SCPreferencesRef targetPrefs,
				      CFDictionaryRef serviceMapping, CFDictionaryRef bsdMapping,
				      CFDictionaryRef setMapping, CFDictionaryRef serviceSetMapping)
{
	ServiceMigrationContext context;
	Boolean success = FALSE;

	if ((sourcePrefs == NULL) ||
	    (targetPrefs == NULL) ||
	    (isA_CFDictionary(serviceMapping) == NULL) ||
	    (isA_CFDictionary(bsdMapping) == NULL)) {
		SC_log(LOG_INFO, "No sourcePrefs, targetPrefs, serviceMapping, or bsdMapping");
		goto done;
	}
	context.targetPrefs = targetPrefs;
	context.bsdMapping = bsdMapping;
	context.setMapping = setMapping;
	context.serviceSetMapping = serviceSetMapping;

	CFDictionaryApplyFunction(serviceMapping, ServiceMigrationAddOrReplace, &context);

	success = TRUE;
done:
	return success;
}

static Boolean
_SCNetworkMigrationDoSystemMigration(SCPreferencesRef sourcePrefs, SCPreferencesRef targetPrefs)
{
	CFStringEncoding nameEncoding;
	CFStringRef computerName;
	CFStringRef hostname;
	CFStringRef localHostname;
	CFDictionaryRef btmm = NULL;
	CFDictionaryRef btmmDSID = NULL;
	CFStringRef btmmDSIDPath;
	CFStringRef btmmPath;


	if ((sourcePrefs == NULL) ||
	    (targetPrefs == NULL)) {
		return FALSE;
	}

	hostname = SCPreferencesGetHostName(sourcePrefs);
	if (hostname != NULL) {
		SCPreferencesSetHostName(targetPrefs, hostname);
	}

	localHostname = _SCPreferencesCopyLocalHostName(sourcePrefs);
	if (localHostname != NULL) {
		SCPreferencesSetLocalHostName(targetPrefs, localHostname);
		CFRelease(localHostname);
	}

	computerName = _SCPreferencesCopyComputerName(sourcePrefs, &nameEncoding);

	if (computerName != NULL) {
		SCPreferencesSetComputerName(targetPrefs, computerName, nameEncoding);
		CFRelease(computerName);
	}

	btmmPath = CFStringCreateWithFormat(NULL, NULL,
					    CFSTR("/%@/%@/%@"),
					    kSCPrefSystem,
					    kSCCompNetwork,
					    BACK_TO_MY_MAC);
	btmm = SCPreferencesPathGetValue(sourcePrefs, btmmPath);

	if (btmm != NULL) {
		SCPreferencesPathSetValue(targetPrefs, btmmPath, btmm);
	}
	CFRelease(btmmPath);

	btmmDSIDPath = CFStringCreateWithFormat(NULL, NULL,
						CFSTR("/%@/%@/%@"),
						kSCPrefSystem,
						kSCCompNetwork,
						BACK_TO_MY_MAC_DSIDS);

	btmmDSID = SCPreferencesPathGetValue(sourcePrefs, btmmDSIDPath);
	if (btmmDSID != NULL) {
		SCPreferencesPathSetValue(targetPrefs, btmmDSIDPath, btmmDSID);
	}
	CFRelease(btmmDSIDPath);

	return TRUE;
}
#if	!TARGET_OS_IPHONE

typedef struct {
	CFMutableArrayRef interfaceList;
	SCPreferencesRef ni_prefs;
	CFDictionaryRef bsdMapping;
} SCVirtualInterfaceMemberListContext;

typedef struct {
	SCPreferencesRef prefs;
	SCPreferencesRef ni_prefs;
	CFDictionaryRef bsdMapping;
	CFDictionaryRef virtualBSDMapping;
	CFDictionaryRef mappingBSDNameToService;
	CFDictionaryRef setMapping;
	CFDictionaryRef serviceSetMapping;
} SCVirtualInterfaceContext;

static void
add_virtual_interface(const void *value, void *context)
{
	SCVirtualInterfaceMemberListContext *ctx = (SCVirtualInterfaceMemberListContext*)context;
	CFMutableArrayRef interfaceList = ctx->interfaceList;
	CFDictionaryRef bsdMapping = ctx->bsdMapping;
	CFStringRef oldInterfaceBSDName = (CFStringRef)value;
	SCNetworkInterfaceRef newInterface;
	CFStringRef newInterfaceBSDName;

	SC_log(LOG_INFO, "old BSD interface name: %@", oldInterfaceBSDName);

	newInterfaceBSDName = CFDictionaryGetValue(bsdMapping, oldInterfaceBSDName);
	if (newInterfaceBSDName == NULL) {
		return;
	}
	SC_log(LOG_INFO, "new BSD interface name: %@", newInterfaceBSDName);

	newInterface = __SCNetworkInterfaceCreateWithNIPreferencesUsingBSDName(NULL, ctx->ni_prefs, newInterfaceBSDName);
	if (newInterface != NULL) {
		SC_log(LOG_INFO, "Adding interface to interfaceList: %@", newInterface);
		CFArrayAppendValue(interfaceList, newInterface);
		CFRelease(newInterface);
	}
	return;
}

static void
add_target_bridge(const void *key, const void *value, void *context)
{
	CFStringRef bridgeName;
	CFDictionaryRef bridgeOptions;
	SCVirtualInterfaceContext *ctx = (SCVirtualInterfaceContext*)context;
	CFDictionaryRef bridgeBSDNameMapping = ctx->virtualBSDMapping;
	CFDictionaryRef bsdNameToServiceMapping = ctx->mappingBSDNameToService;
	SCVirtualInterfaceMemberListContext memberListContext;
	CFMutableArrayRef newInterfaceList;
	SCBridgeInterfaceRef newBridge;
	SCBridgeInterfaceRef oldBridge = (SCBridgeInterfaceRef)key;
	CFStringRef oldBSDName;
	CFArrayRef oldInterfaceList = (CFArrayRef)value;
	CFArrayRef oldServiceList;
	SCPreferencesRef prefs = ctx->prefs;
	CFDictionaryRef serviceSetMapping = ctx->serviceSetMapping;
	CFDictionaryRef setMapping = ctx->setMapping;

	newInterfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	memberListContext.bsdMapping = ctx->bsdMapping;
	memberListContext.interfaceList = newInterfaceList;
	memberListContext.ni_prefs = ctx->ni_prefs;

	CFArrayApplyFunction(oldInterfaceList, CFRangeMake(0, CFArrayGetCount(oldInterfaceList)), add_virtual_interface, &memberListContext);

	newBridge = SCBridgeInterfaceCreate(prefs);

	if (!__SCBridgeInterfaceSetMemberInterfaces(newBridge, newInterfaceList)) {
		SC_log(LOG_INFO, "__SCBridgeInterfaceSetMemberInterfaces() failed");
	}
	CFRelease(newInterfaceList);

	bridgeOptions = SCBridgeInterfaceGetOptions(oldBridge);
	if (bridgeOptions != NULL) {
		SCBridgeInterfaceSetOptions(newBridge, bridgeOptions);
	}

	bridgeName = SCNetworkInterfaceGetLocalizedDisplayName(oldBridge);

	if (bridgeName != NULL) {
		SCBridgeInterfaceSetLocalizedDisplayName(newBridge, bridgeName);
	}

	oldBSDName = SCNetworkInterfaceGetBSDName(oldBridge);
	if (oldBSDName == NULL) {
		goto done;
	}

	oldServiceList = CFDictionaryGetValue(bsdNameToServiceMapping, oldBSDName);
	if (oldServiceList == NULL) {
		goto done;
	}

	for (CFIndex idx = 0; idx < CFArrayGetCount(oldServiceList); idx++) {
		SCNetworkServiceRef oldService = CFArrayGetValueAtIndex(oldServiceList, idx);
		if (!__SCNetworkServiceMigrateNew(prefs, oldService, bridgeBSDNameMapping, setMapping, serviceSetMapping)) {
			SC_log(LOG_INFO, "Could not migrate Bridge service: %@", oldService);
		}
	}
done:
	CFRelease(newBridge);
}

static void
_SCNetworkMigrationRemoveBridgeServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		    (SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeBridge)) {
			SC_log(LOG_INFO, "Removing service: %@", service);
			SCNetworkServiceRemove(service);
		}
	}
	CFRelease(services);
}


static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToBridgeServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);
	CFMutableDictionaryRef bridgeServices = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeBridge) {
			CFMutableArrayRef serviceList;
			if (!CFDictionaryContainsKey(bridgeServices, bsdName)) {
				serviceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
				CFDictionaryAddValue(bridgeServices, bsdName, serviceList);
				CFRelease(serviceList);
			}
			serviceList = (CFMutableArrayRef)CFDictionaryGetValue(bridgeServices, bsdName);
			CFArrayAppendValue(serviceList, service);
		}
	}
	CFRelease(services);
	return bridgeServices;
}


static Boolean
_SCNetworkMigrationDoBridgeMigration (SCPreferencesRef sourcePrefs,
				      SCPreferencesRef sourceNIPrefs,
				      SCPreferencesRef targetPrefs,
				      SCPreferencesRef targetNIPrefs,
				      CFDictionaryRef bsdMapping,
				      CFDictionaryRef setMapping,
				      CFDictionaryRef serviceSetMapping)
{
	CFArrayRef allSourceBridges;
	CFArrayRef allTargetBridges;
	SCBridgeInterfaceRef bridge;
	CFMutableDictionaryRef bridgeInterfaceMapping = NULL;
	CFMutableDictionaryRef bridgeMapping;
	CFDictionaryRef bsdNameToBridgeServices;
	SCVirtualInterfaceContext context;
	CFIndex count = 0;
	Boolean success = FALSE;

	allSourceBridges = SCBridgeInterfaceCopyAll(sourcePrefs);
	allTargetBridges = SCBridgeInterfaceCopyAll(targetPrefs);

	bsdNameToBridgeServices = _SCNetworkMigrationCopyMappingBSDNameToBridgeServices(sourcePrefs);

	bridgeInterfaceMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
	bridgeMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	// Create Bridge Interface Mapping
	for (CFIndex idx = 0; idx < CFArrayGetCount(allSourceBridges); idx++) {
		bridge = CFArrayGetValueAtIndex(allSourceBridges, idx);
		CFArrayRef bridgeMembers = SCBridgeInterfaceGetMemberInterfaces(bridge);
		CFMutableArrayRef interfaceList;

		interfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		for (CFIndex idx2 = 0; idx2 < CFArrayGetCount(bridgeMembers); idx2++) {
			CFStringRef interfaceName = NULL;
			SCNetworkInterfaceRef interface = NULL;

			interface = CFArrayGetValueAtIndex(bridgeMembers, idx2);
			interfaceName = SCNetworkInterfaceGetBSDName(interface);

			if (CFDictionaryContainsKey(bsdMapping, interfaceName)) {
				CFStringRef bridgeNewName = CFStringCreateWithFormat(NULL, NULL, CFSTR("bridge%ld"), count);
				CFDictionaryAddValue(bridgeMapping, interfaceName, bridgeNewName);
				CFArrayAppendValue(interfaceList, interfaceName);
				CFRelease(bridgeNewName);
				count++;
			}
		}
		if (CFArrayGetCount(interfaceList) > 0) {
			CFDictionaryAddValue(bridgeInterfaceMapping, bridge, interfaceList);
		}
		CFRelease(interfaceList);
	}
	// Remove bridge services from target
	_SCNetworkMigrationRemoveBridgeServices(targetPrefs);

	// Remove Target Bridges
	for (CFIndex idx = 0; idx < CFArrayGetCount(allTargetBridges); idx++) {
		bridge = CFArrayGetValueAtIndex(allTargetBridges, idx);
		if (!SCBridgeInterfaceRemove(bridge)) {
			SC_log(LOG_INFO, "SCBridgeInterfaceRemove() failed: %@", bridge);
			goto done;
		}
	}

	context.prefs = targetPrefs;
	context.ni_prefs = targetNIPrefs;
	context.bsdMapping = bsdMapping;
	context.virtualBSDMapping = bridgeMapping;
	context.mappingBSDNameToService = bsdNameToBridgeServices;
	context.setMapping = setMapping;
	context.serviceSetMapping = serviceSetMapping;

	// Add Bridge configurations at the target using mapping
	CFDictionaryApplyFunction(bridgeInterfaceMapping, add_target_bridge, &context);

	success = TRUE;
done:
	CFRelease(allSourceBridges);
	CFRelease(allTargetBridges);
	CFRelease(bridgeInterfaceMapping);
	CFRelease(bridgeMapping);
	CFRelease(bsdNameToBridgeServices);
	return success;
}


static void
add_target_bond(const void *key, const void *value, void *context)
{
	CFNumberRef bondMode;
	CFStringRef bondName;
	CFDictionaryRef bondOptions;
	SCVirtualInterfaceContext *ctx = (SCVirtualInterfaceContext*)context;
	CFDictionaryRef bondBSDNameMapping = ctx->virtualBSDMapping;
	CFDictionaryRef bsdNameToServiceMapping = ctx->mappingBSDNameToService;
	SCVirtualInterfaceMemberListContext memberListContext;
	CFMutableArrayRef newInterfaceList;
	SCBondInterfaceRef newBond;
	SCBondInterfaceRef oldBond = (SCBondInterfaceRef)key;
	CFStringRef oldBSDName;
	CFArrayRef oldInterfaceList = (CFArrayRef)value;
	CFArrayRef oldServiceList;
	SCPreferencesRef prefs = ctx->prefs;
	CFDictionaryRef serviceSetMapping = ctx->serviceSetMapping;
	CFDictionaryRef setMapping = ctx->setMapping;

	newInterfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	memberListContext.bsdMapping = ctx->bsdMapping;
	memberListContext.interfaceList = newInterfaceList;
	memberListContext.ni_prefs = ctx->ni_prefs;

	CFArrayApplyFunction(oldInterfaceList, CFRangeMake(0, CFArrayGetCount(oldInterfaceList)), add_virtual_interface, &memberListContext);

	newBond = SCBondInterfaceCreate(prefs);
	if (!__SCBondInterfaceSetMemberInterfaces(newBond, newInterfaceList)) {
		SC_log(LOG_INFO, "__SCBondInterfaceSetMemberInterfaces() failed");
	}
	CFRelease(newInterfaceList);

	bondOptions = SCBondInterfaceGetOptions(oldBond);
	if (bondOptions != NULL) {
		SCBondInterfaceSetOptions(newBond, bondOptions);
	}

	bondName = SCNetworkInterfaceGetLocalizedDisplayName(oldBond);
	if (bondName != NULL) {
		SCBondInterfaceSetLocalizedDisplayName(newBond, bondName);
	}

	bondMode = SCBondInterfaceGetMode(oldBond);
	if (bondMode != NULL) {
		SCBondInterfaceSetMode(newBond, bondMode);
	}
	oldBSDName = SCNetworkInterfaceGetBSDName(oldBond);
	if (oldBSDName == NULL) {
		goto done;
	}

	oldServiceList = CFDictionaryGetValue(bsdNameToServiceMapping, oldBSDName);
	if (oldServiceList == NULL) {
		goto done;
	}

	for (CFIndex idx = 0; idx < CFArrayGetCount(oldServiceList); idx++) {
		SCNetworkServiceRef oldService = CFArrayGetValueAtIndex(oldServiceList, idx);
		if (!__SCNetworkServiceMigrateNew(prefs, oldService, bondBSDNameMapping, setMapping, serviceSetMapping)) {
			SC_log(LOG_INFO, "Could not migrate Bond service: %@", oldService);
		}
	}
done:
	CFRelease(newBond);
}

static void
_SCNetworkMigrationRemoveBondServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeBond) {
			SCNetworkServiceRemove(service);
		}
	}
	CFRelease(services);
}


static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToBondServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);
	CFMutableDictionaryRef bondServices = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeBond) {
			CFMutableArrayRef serviceList;
			if (!CFDictionaryContainsKey(bondServices, bsdName)) {
				serviceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
				CFDictionaryAddValue(bondServices, bsdName, serviceList);
				CFRelease(serviceList);
			}
			serviceList = (CFMutableArrayRef)CFDictionaryGetValue(bondServices, bsdName);
			CFArrayAppendValue(serviceList, service);
		}
	}
	CFRelease(services);
	return bondServices;
}


static Boolean
_SCNetworkMigrationDoBondMigration (SCPreferencesRef sourcePrefs,
				    SCPreferencesRef sourceNIPrefs,
				    SCPreferencesRef targetPrefs,
				    SCPreferencesRef targetNIPrefs,
				    CFDictionaryRef bsdMapping,
				    CFDictionaryRef setMapping,
				    CFDictionaryRef serviceSetMapping)
{
	CFArrayRef allSourceBonds;
	CFArrayRef allTargetBonds;
	SCBondInterfaceRef bond;
	CFMutableDictionaryRef bondInterfaceMapping = NULL;
	CFMutableDictionaryRef bondMapping;
	CFDictionaryRef bsdNameToBondServices;
	SCVirtualInterfaceContext context;
	CFIndex count = 0;
	Boolean success = FALSE;

	allSourceBonds = SCBondInterfaceCopyAll(sourcePrefs);
	allTargetBonds = SCBondInterfaceCopyAll(targetPrefs);

	bsdNameToBondServices = _SCNetworkMigrationCopyMappingBSDNameToBondServices(sourcePrefs);

	bondInterfaceMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
	bondMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
	// Create Bond Interface mapping
	for (CFIndex idx = 0; idx < CFArrayGetCount(allSourceBonds); idx++) {
		bond = CFArrayGetValueAtIndex(allSourceBonds, idx);
		CFArrayRef bondMembers = SCBondInterfaceGetMemberInterfaces(bond);
		CFMutableArrayRef interfaceList;

		interfaceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		for (CFIndex idx2 = 0; idx2 < CFArrayGetCount(bondMembers); idx2++) {
			CFStringRef interfaceName;
			SCNetworkInterfaceRef interface;

			interface = CFArrayGetValueAtIndex(bondMembers, idx2);
			interfaceName = SCNetworkInterfaceGetBSDName(interface);

			if (CFDictionaryContainsKey(bsdMapping, interfaceName)) {
				CFStringRef bondNewName = CFStringCreateWithFormat(NULL, NULL, CFSTR("bond%ld"), count);
				CFDictionaryAddValue(bondMapping, interfaceName, bondNewName);
				CFArrayAppendValue(interfaceList, interfaceName);
				CFRelease(bondNewName);
				count++;
			}
		}
		if (CFArrayGetCount(interfaceList) > 0) {
			CFDictionaryAddValue(bondInterfaceMapping, bond, interfaceList);
		}
		CFRelease(interfaceList);
	}
	// Remove bond services from target
	_SCNetworkMigrationRemoveBondServices(targetPrefs);

	// Remove Target Bonds
	for (CFIndex idx = 0; idx < CFArrayGetCount(allTargetBonds); idx++) {
		bond = CFArrayGetValueAtIndex(allTargetBonds, idx);
		if (!SCBondInterfaceRemove(bond)) {
			SC_log(LOG_INFO, "SCBondInterfaceRemove() failed: %@", bond);
			goto done;
		}
	}

	context.prefs = targetPrefs;
	context.ni_prefs = targetNIPrefs;
	context.bsdMapping = bsdMapping;
	context.virtualBSDMapping = bondMapping;
	context.mappingBSDNameToService = bsdNameToBondServices;
	context.setMapping = setMapping;
	context.serviceSetMapping = serviceSetMapping;

	// Add Bond configurations at the target using mapping
	CFDictionaryApplyFunction(bondInterfaceMapping, add_target_bond, &context);

	success = TRUE;
done:
	CFRelease(allSourceBonds);
	CFRelease(allTargetBonds);
	CFRelease(bondInterfaceMapping);
	CFRelease(bondMapping);
	CFRelease(bsdNameToBondServices);
	return success;
}

static void
add_target_vlan(const void *value, void *context)
{
	CFDictionaryRef bsdMapping;
	SCVirtualInterfaceContext *ctx = (SCVirtualInterfaceContext*)context;
	CFDictionaryRef bsdNameToServiceMapping = ctx->mappingBSDNameToService;
	SCPreferencesRef prefs = ctx->prefs;
	SCVLANInterfaceRef newVLAN = NULL;
	SCNetworkInterfaceRef newPhysicalInterface = NULL;
	CFStringRef newPhysicalInterfaceName;
	SCVLANInterfaceRef oldVLAN = (SCVLANInterfaceRef)value;
	CFStringRef oldBSDName;
	SCNetworkInterfaceRef oldPhysicalInterface;
	CFStringRef oldPhysicalInterfaceName;
	SCNetworkServiceRef oldService;
	CFArrayRef oldServiceList;
	CFDictionaryRef serviceSetMapping = ctx->serviceSetMapping;
	CFDictionaryRef setMapping = ctx->setMapping;
	CFDictionaryRef vlanBSDMapping = ctx->virtualBSDMapping;
	CFNumberRef vlanTag;
	CFStringRef vlanName;
	CFDictionaryRef vlanOptions;

	bsdMapping = ctx->bsdMapping;

	oldPhysicalInterface = SCVLANInterfaceGetPhysicalInterface(oldVLAN);
	if (oldPhysicalInterface == NULL) {
		SC_log(LOG_INFO, "No old VLAN physical interface");
		goto done;
	}

	oldPhysicalInterfaceName = SCNetworkInterfaceGetBSDName(oldPhysicalInterface);
	if (oldPhysicalInterfaceName == NULL) {
		SC_log(LOG_INFO, "No old VLAN physical interface name");
		goto done;
	}

	newPhysicalInterfaceName = CFDictionaryGetValue(bsdMapping, oldPhysicalInterfaceName);
	if (newPhysicalInterfaceName == NULL) {
		SC_log(LOG_INFO, "No new VLAN physical interface name");
		goto done;
	}
	newPhysicalInterface = __SCNetworkInterfaceCreateWithNIPreferencesUsingBSDName(NULL, ctx->ni_prefs, newPhysicalInterfaceName);
	if (newPhysicalInterface == NULL) {
		SC_log(LOG_INFO, "Could not create new VLAN physical interface");
		goto done;
	}

	vlanTag = SCVLANInterfaceGetTag(oldVLAN);
	if (vlanTag == NULL) {
		SC_log(LOG_INFO, "No old VLAN interface tag");
		goto done;
	}

	newVLAN = SCVLANInterfaceCreate(prefs, newPhysicalInterface, vlanTag);
	if (newVLAN == NULL) {
		SC_log(LOG_INFO, "Could not create new VLAN interface");
		goto done;
	}

	vlanName = SCNetworkInterfaceGetLocalizedDisplayName(oldVLAN);
	if (vlanName != NULL) {
		SCVLANInterfaceSetLocalizedDisplayName(newVLAN, vlanName);
	}

	vlanOptions = SCVLANInterfaceGetOptions(oldVLAN);
	if (vlanOptions != NULL) {
		SCVLANInterfaceSetOptions(newVLAN, vlanOptions);
	}
	oldBSDName = SCNetworkInterfaceGetBSDName(oldVLAN);

	if (oldBSDName == NULL) {
		goto done;
	}

	oldServiceList = CFDictionaryGetValue(bsdNameToServiceMapping, oldBSDName);
	if (oldServiceList == NULL) {
		goto done;
	}

	for (CFIndex idx = 0; idx < CFArrayGetCount(oldServiceList); idx++) {
		oldService = CFArrayGetValueAtIndex(oldServiceList, idx);
		if (!__SCNetworkServiceMigrateNew(prefs, oldService, vlanBSDMapping, setMapping, serviceSetMapping)) {
			SC_log(LOG_INFO, "Could not migrate VLAN service: %@", oldService);
		}
	}

done:
	if (newPhysicalInterface != NULL) {
		CFRelease(newPhysicalInterface);
	}
	if (newVLAN != NULL) {
		CFRelease(newVLAN);
	}
}

static void
_SCNetworkMigrationRemoveVLANServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		    SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeVLAN) {
			SCNetworkServiceRemove(service);
		}
	}

	CFRelease(services);
}


static CFDictionaryRef
_SCNetworkMigrationCopyMappingBSDNameToVLANServices(SCPreferencesRef prefs)
{
	CFArrayRef services = SCNetworkServiceCopyAll(prefs);
	CFMutableDictionaryRef vlanServices = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(services); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(services, idx);
		SCNetworkInterfaceRef interface = SCNetworkServiceGetInterface(service);
		CFStringRef bsdName = SCNetworkInterfaceGetBSDName(interface);

		if ((bsdName != NULL) &&
		    SCNetworkInterfaceGetInterfaceType(interface) == kSCNetworkInterfaceTypeVLAN) {
			CFMutableArrayRef serviceList;
			if (!CFDictionaryContainsKey(vlanServices, bsdName)) {
				serviceList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
				CFDictionaryAddValue(vlanServices, bsdName, serviceList);
				CFRelease(serviceList);
			}
			serviceList = (CFMutableArrayRef)CFDictionaryGetValue(vlanServices, bsdName);
			CFArrayAppendValue(serviceList, service);
		}
	}
	CFRelease(services);
	return vlanServices;
}

static Boolean
_SCNetworkMigrationDoVLANMigration (SCPreferencesRef sourcePrefs,
				    SCPreferencesRef sourceNIPrefs,
				    SCPreferencesRef targetPrefs,
				    SCPreferencesRef targetNIPrefs,
				    CFDictionaryRef bsdMapping,
				    CFDictionaryRef setMapping,
				    CFDictionaryRef serviceSetMapping)
{
	CFArrayRef allSourceVLAN;
	CFArrayRef allTargetVLAN;
	SCVirtualInterfaceContext context;
	CFIndex count = 0;
	Boolean success = FALSE;
	SCVLANInterfaceRef vlan;
	CFMutableArrayRef vlanList;
	CFMutableDictionaryRef vlanMapping;
	CFDictionaryRef bsdNameToVLANServices;

	allSourceVLAN = SCVLANInterfaceCopyAll(sourcePrefs);
	allTargetVLAN = SCVLANInterfaceCopyAll(targetPrefs);

	bsdNameToVLANServices = _SCNetworkMigrationCopyMappingBSDNameToVLANServices(sourcePrefs);

	vlanList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	vlanMapping = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(allSourceVLAN); idx++) {
		vlan = CFArrayGetValueAtIndex(allSourceVLAN, idx);
		CFStringRef vlanBSDName = SCNetworkInterfaceGetBSDName(vlan);
		SCNetworkInterfaceRef physicalInterface = SCVLANInterfaceGetPhysicalInterface(vlan);
		CFStringRef physicalInterfaceName;

		SC_log(LOG_DEBUG, "physical VLAN interface: %@", physicalInterface);

		physicalInterfaceName = SCNetworkInterfaceGetBSDName(physicalInterface);
		SC_log(LOG_DEBUG, "physical VLAN interface name: %@", physicalInterfaceName);

		// Add VLAN to be migrated if the mapping between interfaces exists
		if (CFDictionaryContainsKey(bsdMapping, physicalInterfaceName)) {
			CFStringRef vlanNewName = CFStringCreateWithFormat(NULL, NULL, CFSTR("vlan%ld"), count);
			CFDictionaryAddValue(vlanMapping, vlanBSDName, vlanNewName);
			CFArrayAppendValue(vlanList, vlan);
			CFRelease(vlanNewName);
			count++;
		}
	}
	// Remove vlan services from target
	_SCNetworkMigrationRemoveVLANServices(targetPrefs);

	// Remove Target VLANs
	for (CFIndex idx = 0; idx < CFArrayGetCount(allTargetVLAN); idx++) {
		vlan = CFArrayGetValueAtIndex(allTargetVLAN, idx);
		if (!SCVLANInterfaceRemove(vlan)) {
			SC_log(LOG_INFO, "SCVLANInterfaceRemove() failed: %@", vlan);
			goto done;
		}
	}

	context.prefs = targetPrefs;
	context.ni_prefs = targetNIPrefs;
	context.bsdMapping = bsdMapping;
	context.virtualBSDMapping = vlanMapping;
	context.mappingBSDNameToService = bsdNameToVLANServices;
	context.setMapping = setMapping;
	context.serviceSetMapping = serviceSetMapping;

	// Add VLAN configurations at the target using vlanList
	CFArrayApplyFunction(vlanList, CFRangeMake(0, CFArrayGetCount(vlanList)), add_target_vlan, &context);

	success = TRUE;
done:
	CFRelease(allSourceVLAN);
	CFRelease(allTargetVLAN);
	CFRelease(vlanList);
	CFRelease(vlanMapping);
	CFRelease(bsdNameToVLANServices);
	return success;
}

static Boolean
_SCNetworkMigrationDoVirtualNetworkInterfaceMigration(SCPreferencesRef sourcePrefs,
						      SCPreferencesRef sourceNIPrefs,
						      SCPreferencesRef targetPrefs,
						      SCPreferencesRef targetNIPrefs,
						      CFDictionaryRef bsdMapping,
						      CFDictionaryRef setMapping,
						      CFDictionaryRef serviceSetMapping)
{
	// Handle Bridges
	if (!_SCNetworkMigrationDoBridgeMigration(sourcePrefs, sourceNIPrefs,
						 targetPrefs, targetNIPrefs,
						 bsdMapping, setMapping, serviceSetMapping)) {
		SC_log(LOG_INFO, "Bridge migration failed");
	}

	// Handle Bonds
	if (!_SCNetworkMigrationDoBondMigration(sourcePrefs, sourceNIPrefs,
					       targetPrefs, targetNIPrefs,
					       bsdMapping, setMapping, serviceSetMapping)) {
		SC_log(LOG_INFO, "Bond migration failed");
	}

	// Handle VLANs
	if (!_SCNetworkMigrationDoVLANMigration(sourcePrefs, sourceNIPrefs,
					       targetPrefs, targetNIPrefs,
					       bsdMapping, setMapping, serviceSetMapping)) {
		SC_log(LOG_INFO, "VLAN migration failed");
	}
	return TRUE;
}
#endif

typedef struct {
	SCPreferencesRef prefs;
	CFArrayRef serviceOrder;
	CFMutableArrayRef serviceListMutable;
	Boolean* success;
} migrated_service_context;

static void
create_migrated_order(const void *value, void *context)
{
	migrated_service_context *ctx = (migrated_service_context*)context;
	CFMutableArrayRef migratedServiceOrder = ctx->serviceListMutable;
	CFArrayRef targetServiceOrder = ctx->serviceOrder;
	CFStringRef migratedServiceID = (CFStringRef)value;
	Boolean *success = ctx->success;

	if (*success == FALSE) {
		return;
	}
	// Preserving the service order in the source configuration for the services
	// which were migrated into the target configuration
	for (CFIndex idx = 0; idx < CFArrayGetCount(targetServiceOrder); idx++) {
		CFStringRef targetServiceID = CFArrayGetValueAtIndex(targetServiceOrder, idx);
		if (CFEqual(migratedServiceID, targetServiceID)) {
			CFArrayAppendValue(migratedServiceOrder, migratedServiceID);
			return;
		}
	}
}

static void
create_non_migrated_service_list(const void *value, void *context)
{
	migrated_service_context *ctx = (migrated_service_context*)context;
	CFArrayRef migratedServiceOrder = ctx->serviceOrder;
	CFMutableArrayRef nonMigratedService = ctx->serviceListMutable;
	SCPreferencesRef prefs = ctx->prefs;
	SCNetworkServiceRef service;
	Boolean *success = ctx->success;
	CFStringRef targetServiceID = (CFStringRef)value;

	if (*success == FALSE) {
		return;
	}
	// Adding all services not present in migratedServiceOrder into nonMigrated service
	for (CFIndex idx = 0; idx < CFArrayGetCount(migratedServiceOrder); idx++) {
		CFStringRef migratedServiceID = CFArrayGetValueAtIndex(migratedServiceOrder, idx);

		if (CFEqual(targetServiceID, migratedServiceID)) {
			return;
		}
	}
	service = SCNetworkServiceCopy(prefs, targetServiceID);
	if (service == NULL) {
		*success = FALSE;
		return;
	}

	CFArrayAppendValue(nonMigratedService, service);
	CFRelease(service);
}

static void
preserve_service_order(const void *key, const void *value, void *context)
{
	migrated_service_context migrated_context;
	CFMutableArrayRef migratedServiceOrder;
	migrated_service_context non_migrated_context;
	CFMutableArrayRef nonMigratedServices;
	SCNetworkSetRef sourceSet = (SCNetworkSetRef)key;
	CFArrayRef sourceServiceOrder = NULL;
	Boolean *success = (Boolean*)context;
	SCNetworkSetRef targetSet = (SCNetworkSetRef)value;
	SCNetworkSetPrivateRef targetPrivate = (SCNetworkSetPrivateRef)targetSet;
	CFArrayRef targetServiceOrder = NULL;

	if (*success == FALSE) {
		return;
	}
	migratedServiceOrder = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	nonMigratedServices = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	sourceServiceOrder = SCNetworkSetGetServiceOrder(sourceSet);
	if (sourceServiceOrder == NULL) {
		goto done;
	}
	targetServiceOrder = SCNetworkSetGetServiceOrder(targetSet);
	if (targetServiceOrder == NULL) {
		goto done;
	}

	migrated_context.prefs = NULL;
	migrated_context.serviceOrder = targetServiceOrder;
	migrated_context.serviceListMutable = migratedServiceOrder;
	migrated_context.success = success;

	// Creating a list of service IDs which were migrated in the target set
	// while maintaining the service order or the source set
	CFArrayApplyFunction(sourceServiceOrder, CFRangeMake(0, CFArrayGetCount(sourceServiceOrder)), create_migrated_order, &migrated_context);

	if (*success == FALSE) {
		goto done;
	}

	non_migrated_context.prefs = targetPrivate->prefs;
	non_migrated_context.serviceOrder = migratedServiceOrder;
	non_migrated_context.serviceListMutable = nonMigratedServices;
	non_migrated_context.success = success;

	// Creating a list of all the services which were not migrated from the source set to the
	// target set
	CFArrayApplyFunction(targetServiceOrder, CFRangeMake(0, CFArrayGetCount(targetServiceOrder)), create_non_migrated_service_list, &non_migrated_context);

	// Remove non migrated service
	for (CFIndex idx = 0; idx < CFArrayGetCount(nonMigratedServices); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(nonMigratedServices, idx);
		SCNetworkSetRemoveService(targetSet, service);
	}
	// Set migrated service order
	SCNetworkSetSetServiceOrder(targetSet, migratedServiceOrder);

	// Add non migrated services
	for (CFIndex idx = 0; idx < CFArrayGetCount(nonMigratedServices); idx++) {
		SCNetworkServiceRef service = CFArrayGetValueAtIndex(nonMigratedServices, idx);
		(void)SCNetworkSetAddService(targetSet, service);
	}

done:
	CFRelease(migratedServiceOrder);
	CFRelease(nonMigratedServices);
	return;

}

static Boolean
_SCNetworkMigrationDoServiceOrderMigration(SCPreferencesRef sourcePrefs,
					   SCPreferencesRef targetPrefs,
					   CFDictionaryRef setMapping)
{
	Boolean success = TRUE;

	if (isA_CFDictionary(setMapping) == NULL) {
		success = FALSE;
		goto done;
	}

	CFDictionaryApplyFunction(setMapping, preserve_service_order, &success);
done:
	return success;
}


// This is a function that looks at source and target network configuration
// and determines what network configurations can be transferred from source to
// target
static Boolean
_SCNetworkConfigurationMigrateConfiguration(CFURLRef sourceDir, CFURLRef targetDir)
{
	CFDictionaryRef bsdNameMapping = NULL;			// Mapping between BSD name and SCNetworkInterfaceRef to help with mapping services
	CFMutableDictionaryRef builtinMapping = NULL;		// Mapping between builtin interfaces between source and target configurations: (SCNetworkInterfaceRef -> SCNetworkInterfaceRef)
	CFMutableDictionaryRef externalMapping = NULL;		// Mapping between external interfaces between source and target configurations: (SCNetworkInterfaceRef -> SCNetworkInterfaceRef)
	Boolean migrationSuccess = FALSE;
	CFArrayRef newTargetNetworkInterfaceEntity = NULL;	// Array of Interface Entity which used to create new target interfaces created during migration
	CFDictionaryRef serviceMapping = NULL;			// Mapping between services of source to target. (SCNetworkServicesRef -> SCNetworkServicesRef)
	CFDictionaryRef setMapping = NULL;
	CFDictionaryRef sourceServiceSetMapping = NULL;
	CFArrayRef sourceConfigurationFiles = NULL;		// Path to the source configuration files which need to be migrated
	CFStringRef sourceModel = NULL;
	CFURLRef sourceNetworkInterfaceFile = NULL;		// Source CFURLRef for preferences.plist and NetworkInterfaces.plist
	char sourceNetworkInterfaceFileStr[PATH_MAX];
	CFStringRef sourceNetworkInterfaceFileString = NULL;	// Source CFStringRef for preferences.plist and NetworkInterfaces.plist
	SCPreferencesRef sourceNetworkInterfacePrefs = NULL;	// Source SCPreferencesRef for preferences.plist and NetworkInterfaces.plist
	CFURLRef sourcePreferencesFile = NULL;
	char sourcePreferencesFileStr[PATH_MAX];
	CFStringRef sourcePreferencesFileString = NULL;
	SCPreferencesRef sourcePrefs = NULL;
	CFArrayRef targetConfigurationFiles = NULL;		// Path to the target configuration files where migration will take place to
	Boolean targetConfigurationFilesPresent;
	CFStringRef targetModel = NULL;
	CFURLRef targetNetworkInterfaceFile = NULL;		// Target CFURLRef for preferences.plist and NetworkInterfaces.plist
	char targetNetworkInterfaceFileStr[PATH_MAX];
	CFStringRef targetNetworkInterfaceFileString = NULL;	// Target CFStringRef for preferences.plist and NetworkInterfaces.plist
	SCPreferencesRef targetNetworkInterfacePrefs = NULL;	// Target SCPreferencesRef for preferences.plist and NetworkInterfaces.plist
	CFURLRef targetPreferencesFile = NULL;
	char targetPreferencesFileStr[PATH_MAX];
	CFStringRef targetPreferencesFileString = NULL;
	SCPreferencesRef targetPrefs = NULL;
	Boolean isUpgradeScenario = FALSE;
	CFMutableDictionaryRef validityOptions = NULL;

	// Check if configuration files exist in sourceDir
	if (!__SCNetworkConfigurationMigrateConfigurationFilesPresent(sourceDir, &sourceConfigurationFiles)) {
		SC_log(LOG_INFO, "sourceDir: (%@) doesn't contain configuration files", sourceDir);
		goto done;
	}

	sourcePreferencesFile = CFArrayGetValueAtIndex(sourceConfigurationFiles, PREFERENCES_PLIST_INDEX);
	if (!CFURLGetFileSystemRepresentation(sourcePreferencesFile, TRUE, (UInt8*)sourcePreferencesFileStr, sizeof(sourcePreferencesFileStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", sourcePreferencesFile);
		goto done;
	}

	sourceNetworkInterfaceFile = CFArrayGetValueAtIndex(sourceConfigurationFiles, NETWORK_INTERFACES_PLIST_INDEX);
	if (!CFURLGetFileSystemRepresentation(sourceNetworkInterfaceFile, TRUE, (UInt8*)sourceNetworkInterfaceFileStr, sizeof(sourceNetworkInterfaceFileStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", sourceNetworkInterfaceFile);
		goto done;
	}

	sourcePreferencesFileString = CFStringCreateWithCString(NULL, sourcePreferencesFileStr, kCFStringEncodingUTF8);
	sourceNetworkInterfaceFileString = CFStringCreateWithCString(NULL, sourceNetworkInterfaceFileStr, kCFStringEncodingUTF8);

	sourcePrefs = SCPreferencesCreate(NULL, PLUGIN_ID, sourcePreferencesFileString);
	sourceNetworkInterfacePrefs = SCPreferencesCreate(NULL, PLUGIN_ID, sourceNetworkInterfaceFileString);
	if ((sourcePrefs == NULL) || (sourceNetworkInterfacePrefs == NULL)) {
		goto done;
	}

	targetConfigurationFilesPresent = __SCNetworkConfigurationMigrateConfigurationFilesPresent(targetDir, &targetConfigurationFiles);
	if (!targetConfigurationFilesPresent) {
		if (targetConfigurationFiles == NULL) {
			SC_log(LOG_DEBUG, "targetConfigurationFiles is NULL");
			goto done;
		}
		SC_log(LOG_INFO, "targetDir: (%@) doesn't contain configuration files ... Need to create default configuration", targetDir);
	}

	targetPreferencesFile = CFArrayGetValueAtIndex(targetConfigurationFiles, PREFERENCES_PLIST_INDEX);
	if (!CFURLGetFileSystemRepresentation(targetPreferencesFile, TRUE, (UInt8*)targetPreferencesFileStr, sizeof(targetPreferencesFileStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", targetPreferencesFile);
		goto done;
	}
	targetNetworkInterfaceFile = CFArrayGetValueAtIndex(targetConfigurationFiles, NETWORK_INTERFACES_PLIST_INDEX);
	if (!CFURLGetFileSystemRepresentation(targetNetworkInterfaceFile, TRUE, (UInt8*)targetNetworkInterfaceFileStr, sizeof(targetNetworkInterfaceFileStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", targetNetworkInterfaceFile);
		goto done;
	}

	targetPreferencesFileString = CFStringCreateWithCString(NULL, targetPreferencesFileStr, kCFStringEncodingUTF8);
	targetNetworkInterfaceFileString = CFStringCreateWithCString(NULL, targetNetworkInterfaceFileStr, kCFStringEncodingUTF8);

	if (targetConfigurationFilesPresent) {
		targetPrefs = SCPreferencesCreate(NULL, PLUGIN_ID, targetPreferencesFileString);
		targetNetworkInterfacePrefs = SCPreferencesCreate(NULL, PLUGIN_ID, targetNetworkInterfaceFileString);
		if ((targetPrefs == NULL) || (targetNetworkInterfacePrefs == NULL)) {
			goto done;
		}
	}
	else {
		targetPrefs = __SCNetworkCreateDefaultPref(targetPreferencesFileString);
		targetNetworkInterfacePrefs = __SCNetworkCreateDefaultNIPrefs(targetNetworkInterfaceFileString);

		if (targetPrefs == NULL ||
		    targetNetworkInterfacePrefs == NULL) {
			SC_log(LOG_DEBUG, "Could not create default configuration");
			goto done;
		}
	}
	validityOptions = CFDictionaryCreateMutable(NULL, 0,
						    &kCFTypeDictionaryKeyCallBacks,
						    &kCFTypeDictionaryValueCallBacks);
	CFDictionaryAddValue(validityOptions, kSCNetworkConfigurationRepair, kCFBooleanTrue);

	SC_log(LOG_DEBUG, "sourcePreferenceFileString: %@\n"
			  "sourceNetworkInterfaceFileString:%@\n"
			  "targetPreferencesFileString:%@\n"
			  "targetNetworkInterfaceFileString:%@",
	       sourcePreferencesFileString,
	       sourceNetworkInterfaceFileString,
	       targetPreferencesFileString,
	       targetNetworkInterfaceFileString);

	// Setting Bypass Interface to avoid looking at system interfaces
	__SCPreferencesSetLimitSCNetworkConfiguration(sourcePrefs, TRUE);
	__SCPreferencesSetLimitSCNetworkConfiguration(targetPrefs, TRUE);

	sourceModel = SCPreferencesGetValue(sourcePrefs, MODEL);
	targetModel = SCPreferencesGetValue(targetPrefs, MODEL);

	isUpgradeScenario = (isA_CFString(sourceModel) && isA_CFString(targetModel) && CFStringCompare(sourceModel, targetModel, 0) == kCFCompareEqualTo);

	// Create services for builtin interfaces at source if they don't exist
	(void)_SCNetworkConfigurationCreateBuiltinInterfaceServices(sourcePrefs, sourceNetworkInterfacePrefs);
	// Checking validity of the source and destination preferences before continuing
	if (!_SCNetworkConfigurationCheckValidityWithPreferences(sourcePrefs,
								 sourceNetworkInterfacePrefs,
								 validityOptions)) {
		SC_log(LOG_INFO, "Source configuration not valid");
		goto skipServiceMigration;
	}
	// Only call this function if configuration files were not created by default
	if (targetConfigurationFilesPresent) {
		// Create services for builtin interfaces at target if they don't exist
		(void)_SCNetworkConfigurationCreateBuiltinInterfaceServices(targetPrefs, targetNetworkInterfacePrefs);
		if (!_SCNetworkConfigurationCheckValidityWithPreferences(targetPrefs,
									 targetNetworkInterfacePrefs,
									 validityOptions)) {
			SC_log(LOG_INFO, "Target configuration not valid");
			goto skipServiceMigration;
		}
	}
	SC_log(LOG_DEBUG, "This is %san upgrade scenario", isUpgradeScenario ? "" : "not ");
	// Upgrade scenario, source and target models match
	if (isUpgradeScenario) {
		Boolean foundNewInterface = FALSE;
		// Create SCPreferences to copy the target prefs
		SCPreferencesRef upgradeSourcePrefs = SCPreferencesCreate(NULL, CFSTR("Upgrade Source Prefs"), NULL);
		SCPreferencesRef upgradeSourceNIPrefs = SCPreferencesCreate(NULL, CFSTR("Upgrade Source NI Prefs"), NULL);

		// Content of target prefs
		CFDictionaryRef targetPrefsContent = SCPreferencesPathGetValue(targetPrefs, CFSTR("/"));
		CFDictionaryRef targetNIPrefsContent  = SCPreferencesPathGetValue(targetNetworkInterfacePrefs, CFSTR("/"));

		// Backing up the target prefs into source prefs
		SCPreferencesPathSetValue(upgradeSourcePrefs, CFSTR("/"), targetPrefsContent);
		SCPreferencesPathSetValue(upgradeSourceNIPrefs, CFSTR("/"), targetNIPrefsContent);

		// Copying content from the source prefs
		CFDictionaryRef sourcePrefsContent = SCPreferencesPathGetValue(sourcePrefs, CFSTR("/"));
		CFDictionaryRef sourceNIPreferencesContent = SCPreferencesPathGetValue(sourceNetworkInterfacePrefs, CFSTR("/"));

		// Setting the contents of the source prefs into the target prefs
		SCPreferencesPathSetValue(targetPrefs, CFSTR("/"), sourcePrefsContent);
		SCPreferencesPathSetValue(targetNetworkInterfacePrefs, CFSTR("/"), sourceNIPreferencesContent);

		// Getting the mapping of the non builtin interfaces between source and target
		externalMapping = _SCNetworkConfigurationCopyExternalInterfaceMapping(upgradeSourceNIPrefs, targetNetworkInterfacePrefs);

		newTargetNetworkInterfaceEntity = _SCNetworkMigrationCreateNetworkInterfaceArray(targetNetworkInterfacePrefs, externalMapping, &foundNewInterface);
		if (foundNewInterface) {
			if (isA_CFArray(newTargetNetworkInterfaceEntity) == NULL) {
				SC_log(LOG_INFO, "newTargetNetworkInterfaceEntity is NULL or not of correct type");
				CFRelease(upgradeSourcePrefs);
				CFRelease(upgradeSourceNIPrefs);
				goto done;
			}
			// Write new interface mapping to NetworkInterfaces.plist
			if (!__SCNetworkInterfaceSaveStoredWithPreferences(targetNetworkInterfacePrefs, newTargetNetworkInterfaceEntity)) {
				SC_log(LOG_INFO, "SCNetworkInterfaceSaveStoreWithPreferences: failed to update NetworkInterfaces.plist");
				CFRelease(upgradeSourcePrefs);
				CFRelease(upgradeSourceNIPrefs);
				goto done;
			}

			// Create BSD Name Mapping to facilitate mapping of services
			bsdNameMapping = _SCNetworkMigrationCreateBSDNameMapping(NULL, externalMapping);

			serviceMapping = _SCNetworkMigrationCreateServiceMappingUsingBSDMapping(upgradeSourcePrefs, targetPrefs, bsdNameMapping);

			_SCNetworkMigrationDoServiceMigration(upgradeSourcePrefs, targetPrefs,
							      serviceMapping, bsdNameMapping,
							      NULL, NULL);
		}
		CFRelease(upgradeSourcePrefs);
		CFRelease(upgradeSourceNIPrefs);
	}
	else {
		builtinMapping = _SCNetworkConfigurationCopyBuiltinMapping(sourceNetworkInterfacePrefs, targetNetworkInterfacePrefs);
		externalMapping = _SCNetworkConfigurationCopyExternalInterfaceMapping(sourceNetworkInterfacePrefs, targetNetworkInterfacePrefs);

		newTargetNetworkInterfaceEntity = _SCNetworkMigrationCreateNetworkInterfaceArray(targetNetworkInterfacePrefs, externalMapping, NULL);
		if (isA_CFArray(newTargetNetworkInterfaceEntity) == NULL) {
			SC_log(LOG_INFO, "newTargetNetworkInterfaceEntity is NULL or not of correct type");
			goto done;
		}
		// Write new interface mapping to NetworkInterfaces.plist
		if (!__SCNetworkInterfaceSaveStoredWithPreferences(targetNetworkInterfacePrefs, newTargetNetworkInterfaceEntity)) {
			SC_log(LOG_INFO, "SCNetworkInterfaceSaveStoreWithPreferences: failed to update NetworkInterfaces.plist");
			goto done;
		}
		// Create BSD Name Mapping to facilitate mapping of services
		bsdNameMapping = _SCNetworkMigrationCreateBSDNameMapping(builtinMapping, externalMapping);

		if (isA_CFDictionary(bsdNameMapping) == NULL) {
			SC_log(LOG_INFO, "BSD name mapping is NULL");
			goto done;
		}
		SC_log(LOG_DEBUG, "BSD Name Mapping: %@", bsdNameMapping);
		serviceMapping = _SCNetworkMigrationCreateServiceMappingUsingBSDMapping(sourcePrefs, targetPrefs, bsdNameMapping);
		if (serviceMapping == NULL) {
			goto done;
		}

		setMapping = _SCNetworkMigrationCreateSetMapping(sourcePrefs, targetPrefs);
		sourceServiceSetMapping = _SCNetworkMigrationCreateServiceSetMapping(sourcePrefs);

		// Perform the migration of services
		if (!_SCNetworkMigrationDoServiceMigration(sourcePrefs, targetPrefs,
							  serviceMapping, bsdNameMapping,
							  setMapping, sourceServiceSetMapping)) {
			SC_log(LOG_INFO, "SCNetworkMigrationDoServiceMigration: failed to complete successfully");
			goto done;
		}

#if	!TARGET_OS_IPHONE
		// Migrating Virtual Network Interface
		if (!_SCNetworkMigrationDoVirtualNetworkInterfaceMigration(sourcePrefs, sourceNetworkInterfacePrefs,
									  targetPrefs, targetNetworkInterfacePrefs,
									  bsdNameMapping, setMapping, sourceServiceSetMapping)) {
			SC_log(LOG_INFO, "_SCNetworkMigrationDoVirtualNetworkInterfaceMigration: failed to complete successfully");
		}
#endif
		// Migrate Service Order
		if (!_SCNetworkMigrationDoServiceOrderMigration(sourcePrefs, targetPrefs, setMapping)) {
			SC_log(LOG_INFO, "_SCNetworkMigrationDoServiceOrderMigration: failed to complete successfully");
		}
	}

skipServiceMigration:
	// Migrating System Information
	if (!isUpgradeScenario) {
		if (!_SCNetworkMigrationDoSystemMigration(sourcePrefs, targetPrefs)) {
			SC_log(LOG_INFO, "_SCNetworkMigrationDoSystemMigration: failed to complete successfully");
		}
	}
	if (!_SCNetworkConfigurationCheckValidityWithPreferences(targetPrefs, targetNetworkInterfacePrefs, validityOptions)) {
		SC_log(LOG_INFO, "Migrated configuration not valid");
		goto done;
	}
	if (!SCPreferencesCommitChanges(targetPrefs)) {
		SC_log(LOG_INFO, "SCPreferencesCommitChanges(target preferences.plist) failed: %s", SCErrorString(SCError()));
		goto done;
	}

	if (!SCPreferencesCommitChanges(targetNetworkInterfacePrefs)) {
		SC_log(LOG_INFO, "SCPreferencesCommitChanges(target NetworkInterfaces.plist) failed: %s", SCErrorString(SCError()));
		goto done;
	}
	migrationSuccess = TRUE;

done:
	if (setMapping != NULL) {
		CFRelease(setMapping);
	}
	if (sourceServiceSetMapping != NULL) {
		CFRelease(sourceServiceSetMapping);
	}
	if (sourceConfigurationFiles != NULL) {
		CFRelease(sourceConfigurationFiles);
	}
	if (targetConfigurationFiles != NULL) {
		CFRelease(targetConfigurationFiles);
	}
	if (sourcePreferencesFileString != NULL) {
		CFRelease(sourcePreferencesFileString);
	}
	if (sourceNetworkInterfaceFileString != NULL) {
		CFRelease(sourceNetworkInterfaceFileString);
	}
	if (targetPreferencesFileString != NULL) {
		CFRelease(targetPreferencesFileString);
	}
	if (targetNetworkInterfaceFileString != NULL) {
		CFRelease(targetNetworkInterfaceFileString);
	}
	if (newTargetNetworkInterfaceEntity != NULL) {
		CFRelease(newTargetNetworkInterfaceEntity);
	}
	if (builtinMapping != NULL) {
		CFRelease(builtinMapping);
	}
	if (externalMapping != NULL) {
		CFRelease(externalMapping);
	}
	if (bsdNameMapping != NULL) {
		CFRelease(bsdNameMapping);
	}
	if (serviceMapping != NULL) {
		CFRelease(serviceMapping);
	}
	if (targetPrefs != NULL) {
		CFRelease(targetPrefs);
	}
	if (sourcePrefs != NULL) {
		CFRelease(sourcePrefs);
	}
	if (sourceNetworkInterfacePrefs != NULL) {
		CFRelease(sourceNetworkInterfacePrefs);
	}
	if (targetNetworkInterfacePrefs != NULL) {
		CFRelease(targetNetworkInterfacePrefs);
	}
	if (validityOptions != NULL) {
		CFRelease(validityOptions);
	}
	return migrationSuccess;
}

#define N_QUICK 64

static Boolean
_SCNetworkMigrationAreServicesIdentical(SCPreferencesRef configPref, SCPreferencesRef expectedConfigPref)
{
	const void * expected_vals_q[N_QUICK];
	const void ** expected_vals = expected_vals_q;
	CFMutableArrayRef expectedServiceArray = NULL;
	CFIndex expectedServiceArrayCount = 0;
	CFDictionaryRef expectedServiceDict = NULL;
	CFIndex expectedServiceDictCount = 0;
	CFDictionaryRef expectedServiceEntity = 0;
	Boolean foundMatch = FALSE;
	CFMutableArrayRef serviceArray = NULL;
	CFIndex serviceArrayCount = 0;
	CFDictionaryRef serviceDict = NULL;
	CFIndex serviceDictCount = 0;
	CFDictionaryRef serviceEntity = NULL;
	Boolean success = FALSE;
	const void * vals_q[N_QUICK];
	const void ** vals = vals_q;

	serviceDict = SCPreferencesGetValue(configPref, kSCPrefNetworkServices);
	if (isA_CFDictionary(serviceDict) == NULL) {
		goto done;
	}
	serviceDictCount = CFDictionaryGetCount(serviceDict);

	expectedServiceDict = SCPreferencesGetValue(expectedConfigPref, kSCPrefNetworkServices);
	if (isA_CFDictionary(expectedServiceDict) == NULL) {
		goto done;
	}
	expectedServiceDictCount = CFDictionaryGetCount(expectedServiceDict);

	if (serviceDictCount != expectedServiceDictCount) {
		goto done;
	}

	if (serviceDictCount > (sizeof(vals_q) / sizeof(CFTypeRef))) {
		vals = CFAllocatorAllocate(NULL, serviceDictCount * sizeof(CFPropertyListRef), 0);
	}

	CFDictionaryGetKeysAndValues(serviceDict, NULL, vals);
	serviceArray = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	for (CFIndex idx=0; idx < serviceDictCount; idx++) {
		serviceEntity = vals[idx];
		if (!isA_CFDictionary(serviceEntity)) {
			continue;
		}
		CFArrayAppendValue(serviceArray, serviceEntity);
	}

	serviceArrayCount = CFArrayGetCount(serviceArray);

	if (expectedServiceDictCount > (sizeof(expected_vals_q) / sizeof(CFTypeRef))) {
		expected_vals = CFAllocatorAllocate(NULL, expectedServiceDictCount, 0);
	}

	CFDictionaryGetKeysAndValues(expectedServiceDict, NULL, expected_vals);
	expectedServiceArray = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	for (CFIndex idx = 0; idx < expectedServiceDictCount; idx++) {
		serviceEntity = expected_vals[idx];
		if (!isA_CFDictionary(serviceEntity)) {
			continue;
		}
		CFArrayAppendValue(expectedServiceArray, serviceEntity);
	}
	expectedServiceArrayCount = CFArrayGetCount(expectedServiceArray);

	if (serviceArrayCount != expectedServiceArrayCount) {
		goto done;
	}

	for (CFIndex idx = 0; idx < expectedServiceArrayCount; idx++) {
		foundMatch = FALSE;
		expectedServiceEntity = CFArrayGetValueAtIndex(expectedServiceArray, idx);
		serviceArrayCount = CFArrayGetCount(serviceArray);

		for (CFIndex idx2 = 0; idx2 < serviceArrayCount; idx2++) {
			serviceEntity = CFArrayGetValueAtIndex(serviceArray, idx2);

			if (CFEqual(expectedServiceEntity, serviceEntity)) {
				foundMatch = TRUE;
				break;
			}
		}

		if (!foundMatch) {
			break;
		}
	}

	success = foundMatch;
done:
	if (vals != vals_q) {
		CFAllocatorDeallocate(NULL, vals);
	}
	if (expected_vals != expected_vals_q) {
		CFAllocatorDeallocate(NULL, expected_vals);
	}
	return success;
}

static Boolean
_SCNetworkMigrationAreNetworkInterfaceConfigurationsIdentical (SCPreferencesRef configNetworkInterfacePref, SCPreferencesRef expectedNetworkInterfacePref)
{
	CFDictionaryRef expectedInterfaceEntity = NULL;
	CFArrayRef expectedInterfaceList = NULL;
	CFIndex expectedInterfaceListCount;
	Boolean foundMatch = FALSE;
	CFDictionaryRef interfaceEntity = NULL;
	CFArrayRef interfaceList = NULL;
	CFIndex interfaceListCount;
	CFMutableArrayRef interfaceListMutable = NULL;
	Boolean success = FALSE;

	interfaceList = SCPreferencesGetValue(configNetworkInterfacePref, INTERFACES);
	if (isA_CFArray(interfaceList) == NULL) {
		goto done;
	}
	interfaceListMutable = CFArrayCreateMutableCopy(NULL, 0, interfaceList);
	interfaceListCount = CFArrayGetCount(interfaceListMutable);

	expectedInterfaceList = SCPreferencesGetValue(expectedNetworkInterfacePref, INTERFACES);
	if (isA_CFArray(expectedInterfaceList) == NULL) {
		goto done;
	}
	expectedInterfaceListCount = CFArrayGetCount(expectedInterfaceList);

	if (interfaceListCount != expectedInterfaceListCount) {
		goto done;
	}

	for (CFIndex idx = 0; idx < expectedInterfaceListCount; idx++) {
		foundMatch = FALSE;
		expectedInterfaceEntity = CFArrayGetValueAtIndex(expectedInterfaceList, idx);
		interfaceListCount = CFArrayGetCount(interfaceListMutable);

		for (CFIndex idx2 = 0; idx2 < interfaceListCount; idx2++) {
			interfaceEntity = CFArrayGetValueAtIndex(interfaceList, idx2);
			if (CFEqual(expectedInterfaceEntity, interfaceEntity)) {
				foundMatch = TRUE;
				break;
			}
		}
		if (!foundMatch) {
			break;
		}
	}
	success = foundMatch;

done:
	if (interfaceListMutable != NULL) {
		CFRelease(interfaceListMutable);
	}

	return success;
}

Boolean
_SCNetworkMigrationAreConfigurationsIdentical (CFURLRef configurationURL,
					       CFURLRef expectedConfigurationURL)
{
	CFURLRef baseConfigURL = NULL;
	CFURLRef baseExpectedConfigURL = NULL;
	CFURLRef configPreferencesURL = NULL;
	CFURLRef configNetworkInterfacesURL = NULL;
	SCPreferencesRef configPref = NULL;
	SCPreferencesRef configNetworkInterfacePref = NULL;
	SCPreferencesRef expectedConfigPref = NULL;
	SCPreferencesRef expectedNetworkInterfacePref = NULL;
	CFURLRef expectedNetworkInterfaceURL = NULL;
	CFURLRef expectedPreferencesURL = NULL;
	Boolean isIdentical = FALSE;
	CFStringRef networkInterfaceConfigString = NULL;
	CFStringRef networkInterfaceExpectedString = NULL;
	CFStringRef prefsConfigString = NULL;
	CFStringRef prefsExpectedString = NULL;
	char networkInterfaceConfigStr[PATH_MAX];
	char networkInterfaceExpectedStr[PATH_MAX];
	char prefsConfigStr[PATH_MAX];
	char prefsExpectedStr[PATH_MAX];

	if (configurationURL == NULL ||
	    expectedConfigurationURL == NULL) {
		return FALSE;
	}
	baseConfigURL = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE, kCFURLPOSIXPathStyle, TRUE, configurationURL);
	configPreferencesURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*) PREFS_DEFAULT_CONFIG_PLIST, sizeof(PREFS_DEFAULT_CONFIG_PLIST), FALSE, baseConfigURL);

	if (!CFURLResourceIsReachable(configPreferencesURL, NULL)) {
		SC_log(LOG_INFO, "No preferences.plist file");
		goto done;
	}

	configNetworkInterfacesURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)NETWORK_INTERFACES_PREFS_PLIST, sizeof(NETWORK_INTERFACES_PREFS_PLIST), FALSE, baseConfigURL);

	if (!CFURLResourceIsReachable(configNetworkInterfacesURL, NULL)) {
		SC_log(LOG_INFO, "No NetworkInterfaces.plist file");
		goto done;
	}

	if (!CFURLGetFileSystemRepresentation(configPreferencesURL, TRUE, (UInt8*)prefsConfigStr, sizeof(prefsConfigStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configPreferencesURL);
		goto done;
	}
	if (!CFURLGetFileSystemRepresentation(configNetworkInterfacesURL, TRUE, (UInt8*)networkInterfaceConfigStr, sizeof(networkInterfaceConfigStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", configNetworkInterfacesURL);
		goto done;
	}

	baseExpectedConfigURL = CFURLCreateWithFileSystemPathRelativeToBase(NULL, PREFS_DEFAULT_DIR_RELATIVE, kCFURLPOSIXPathStyle, TRUE, expectedConfigurationURL);
	expectedPreferencesURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)PREFS_DEFAULT_CONFIG_PLIST, sizeof(PREFS_DEFAULT_CONFIG_PLIST), FALSE, baseExpectedConfigURL);

	if (!CFURLResourceIsReachable(expectedPreferencesURL, NULL)) {
		SC_log(LOG_INFO, "No expected preferences.plist file");
		goto done;
	}

	expectedNetworkInterfaceURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)NETWORK_INTERFACES_PREFS_PLIST, sizeof(NETWORK_INTERFACES_PREFS_PLIST), FALSE, baseExpectedConfigURL);

	if (!CFURLResourceIsReachable(expectedNetworkInterfaceURL, NULL)) {
		SC_log(LOG_INFO, "No expected NetworkInterfaces.plist file");
		goto done;
	}

	if (!CFURLGetFileSystemRepresentation(expectedPreferencesURL, TRUE, (UInt8*)prefsExpectedStr, sizeof(prefsExpectedStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", expectedPreferencesURL);
		goto done;
	}
	if (!CFURLGetFileSystemRepresentation(expectedNetworkInterfaceURL, TRUE, (UInt8*)networkInterfaceExpectedStr, sizeof(networkInterfaceExpectedStr))) {
		SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", expectedNetworkInterfaceURL);
		goto done;
	}

	prefsConfigString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), prefsConfigStr);
	networkInterfaceConfigString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), networkInterfaceConfigStr);
	prefsExpectedString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), prefsExpectedStr);
	networkInterfaceExpectedString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%s"), networkInterfaceExpectedStr);

	configPref = SCPreferencesCreate(NULL, PLUGIN_ID, prefsConfigString);
	expectedConfigPref = SCPreferencesCreate(NULL, PLUGIN_ID, prefsExpectedString);
	configNetworkInterfacePref = SCPreferencesCreate(NULL, PLUGIN_ID, networkInterfaceConfigString);
	expectedNetworkInterfacePref = SCPreferencesCreate(NULL, PLUGIN_ID, networkInterfaceExpectedString);
done:
	if (configPref == NULL ||
	    expectedConfigPref == NULL ||
	    configNetworkInterfacePref == NULL ||
	    expectedNetworkInterfacePref == NULL) {
		SC_log(LOG_INFO, "One of the preferences is NULL");
		isIdentical = FALSE;
	}
	else {
		isIdentical = (_SCNetworkMigrationAreServicesIdentical(configPref, expectedConfigPref) &&
			       _SCNetworkMigrationAreNetworkInterfaceConfigurationsIdentical(configNetworkInterfacePref, expectedNetworkInterfacePref));
	}
	if (baseConfigURL != NULL) {
		CFRelease(baseConfigURL);
	}
	if (configPreferencesURL != NULL) {
		CFRelease(configPreferencesURL);
	}
	if (configNetworkInterfacesURL != NULL) {
		CFRelease(configNetworkInterfacesURL);
	}
	if (baseExpectedConfigURL != NULL) {
		CFRelease(baseExpectedConfigURL);
	}
	if (expectedPreferencesURL != NULL) {
		CFRelease(expectedPreferencesURL);
	}
	if (expectedNetworkInterfaceURL != NULL) {
		CFRelease(expectedNetworkInterfaceURL);
	}
	if (prefsConfigString != NULL) {
		CFRelease(prefsConfigString);
	}
	if (networkInterfaceConfigString != NULL) {
		CFRelease(networkInterfaceConfigString);
	}
	if (prefsExpectedString != NULL) {
		CFRelease(prefsExpectedString);
	}
	if (networkInterfaceExpectedString != NULL) {
		CFRelease(networkInterfaceExpectedString);
	}
	if (configPref != NULL) {
		CFRelease(configPref);
	}
	if (expectedConfigPref != NULL) {
		CFRelease(expectedConfigPref);
	}
	if (configNetworkInterfacePref != NULL) {
		CFRelease(configNetworkInterfacePref);
	}
	if (expectedNetworkInterfacePref != NULL) {
		CFRelease(expectedNetworkInterfacePref);
	}
	return isIdentical;
}

CFArrayRef
_SCNetworkConfigurationCopyMigrationRemovePaths	(CFArrayRef	targetPaths,
						 CFURLRef	targetDir)
{
	CFURLRef affectedURL;
	char filePath[PATH_MAX];
	CFURLRef targetFile;
	CFMutableArrayRef toBeRemoved = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

	for (CFIndex idx = 0; idx < CFArrayGetCount(targetPaths); idx++) {
		affectedURL = CFArrayGetValueAtIndex(targetPaths, idx);

		if (!CFURLGetFileSystemRepresentation(affectedURL, TRUE, (UInt8*)filePath, sizeof(filePath))) {
			SC_log(LOG_NOTICE, "Cannot get file system representation for url: %@", affectedURL);
			continue;
		}
		targetFile = CFURLCreateFromFileSystemRepresentationRelativeToBase(NULL, (const UInt8*)filePath,
		strnlen(filePath, sizeof(filePath)), FALSE, targetDir);

		if (!CFURLResourceIsReachable(targetFile, NULL)) {
			CFArrayAppendValue(toBeRemoved, affectedURL);
		}
		CFRelease(targetFile);
	}
	// If number of files to be removed is 0, return NULL
	if (CFArrayGetCount(toBeRemoved) == 0) {
		CFRelease(toBeRemoved);
		toBeRemoved = NULL;
	}
	return toBeRemoved;
}