435 * @return a byte array containing the address, or {@code null} if
436 * the address doesn't exist, is not accessible or a security
437 * manager is set and the caller does not have the permission
438 * NetPermission("getNetworkInformation")
439 *
440 * @exception SocketException if an I/O error occurs.
441 * @since 1.6
442 */
443 public byte[] getHardwareAddress() throws SocketException {
444 SecurityManager sec = System.getSecurityManager();
445 if (sec != null) {
446 try {
447 sec.checkPermission(new NetPermission("getNetworkInformation"));
448 } catch (SecurityException e) {
449 if (!getInetAddresses().hasMoreElements()) {
450 // don't have connect permission to any local address
451 return null;
452 }
453 }
454 }
455 for (InetAddress addr : addrs) {
456 if (addr instanceof Inet4Address) {
457 return getMacAddr0(((Inet4Address)addr).getAddress(), name, index);
458 }
459 }
460 return getMacAddr0(null, name, index);
461 }
462
463 /**
464 * Returns the Maximum Transmission Unit (MTU) of this interface.
465 *
466 * @return the value of the MTU for that interface.
467 * @exception SocketException if an I/O error occurs.
468 * @since 1.6
469 */
470 public int getMTU() throws SocketException {
471 return getMTU0(name, index);
472 }
473
474 /**
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435 * @return a byte array containing the address, or {@code null} if
436 * the address doesn't exist, is not accessible or a security
437 * manager is set and the caller does not have the permission
438 * NetPermission("getNetworkInformation")
439 *
440 * @exception SocketException if an I/O error occurs.
441 * @since 1.6
442 */
443 public byte[] getHardwareAddress() throws SocketException {
444 SecurityManager sec = System.getSecurityManager();
445 if (sec != null) {
446 try {
447 sec.checkPermission(new NetPermission("getNetworkInformation"));
448 } catch (SecurityException e) {
449 if (!getInetAddresses().hasMoreElements()) {
450 // don't have connect permission to any local address
451 return null;
452 }
453 }
454 }
455 return getHardwareAddress0();
456 }
457
458 // the same as getHardwareAddress(), but without security checks
459 byte[] getHardwareAddress0() throws SocketException {
460 for (InetAddress addr : addrs) {
461 if (addr instanceof Inet4Address) {
462 return getMacAddr0(((Inet4Address)addr).getAddress(), name, index);
463 }
464 }
465 return getMacAddr0(null, name, index);
466 }
467
468 /**
469 * Returns the Maximum Transmission Unit (MTU) of this interface.
470 *
471 * @return the value of the MTU for that interface.
472 * @exception SocketException if an I/O error occurs.
473 * @since 1.6
474 */
475 public int getMTU() throws SocketException {
476 return getMTU0(name, index);
477 }
478
479 /**
|