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	/*
	* Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.jgss.wrapper;

	import java.util.HashMap;
	import java.security.Provider;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import org.ietf.jgss.Oid;
	import sun.security.action.PutAllAction;

	/**
	* Defines the Sun NativeGSS provider for plugging in the
	* native GSS mechanisms to Java GSS.
	*
	* List of supported mechanisms depends on the local
	* machine configuration.
	*
	* @author Yu-Ching Valerie Peng
	*/

	public final class SunNativeProvider extends Provider {

	private static final long serialVersionUID = -238911724858694204L;

	private static final String NAME = "SunNativeGSS";
	private static final String INFO = "Sun Native GSS provider";
	private static final String MF_CLASS =
	"sun.security.jgss.wrapper.NativeGSSFactory";
	private static final String LIB_PROP = "sun.security.jgss.lib";
	private static final String DEBUG_PROP = "sun.security.nativegss.debug";
	private static HashMap<String, String> MECH_MAP;
	static final Provider INSTANCE = new SunNativeProvider();
	static boolean DEBUG;
	static void debug(String message) {
	if (DEBUG) {
	if (message == null) {
	throw new NullPointerException();
	}
	System.out.println(NAME + ": " + message);
	}
	}

	static {
	MECH_MAP =
	AccessController.doPrivileged(
	new PrivilegedAction<HashMap<String, String>>() {
	public HashMap<String, String> run() {
	DEBUG = Boolean.parseBoolean
	(System.getProperty(DEBUG_PROP));
	try {
	System.loadLibrary("j2gss");
	} catch (Error err) {
	debug("No j2gss library found!");
	if (DEBUG) err.printStackTrace();
	return null;
	}
	String gssLibs[] = new String[0];
	String defaultLib = System.getProperty(LIB_PROP);
	if (defaultLib == null \|\| defaultLib.trim().equals("")) {
	String osname = System.getProperty("os.name");
	if (osname.startsWith("SunOS")) {
	gssLibs = new String[]{ "libgss.so" };
	} else if (osname.startsWith("Linux")) {
	gssLibs = new String[]{
	"libgssapi.so",
	"libgssapi_krb5.so",
	"libgssapi_krb5.so.2",
	};
	} else if (osname.contains("OS X")) {
	gssLibs = new String[]{
	"libgssapi_krb5.dylib",
	"/usr/lib/sasl2/libgssapiv2.2.so",
	};
	}
	} else {
	gssLibs = new String[]{ defaultLib };
	}
	for (String libName: gssLibs) {
	if (GSSLibStub.init(libName, DEBUG)) {
	debug("Loaded GSS library: " + libName);
	Oid[] mechs = GSSLibStub.indicateMechs();
	HashMap<String, String> map =
	new HashMap<String, String>();
	for (int i = 0; i < mechs.length; i++) {
	debug("Native MF for " + mechs[i]);
	map.put("GssApiMechanism." + mechs[i],
	MF_CLASS);
	}
	return map;
	}
	}
	return null;
	}
	});
	}

	public SunNativeProvider() {
	/* We are the Sun NativeGSS provider */
	super(NAME, 1.8d, INFO);

	if (MECH_MAP != null) {
	AccessController.doPrivileged(new PutAllAction(this, MECH_MAP));
	}
	}
	}

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