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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.net;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* Native methods for managing network interfaces.
*
* {@hide}
*/
public class NetworkUtils {
/** Bring the named network interface down. */
public native static int disableInterface(String interfaceName);
/** Add a route to the specified host via the named interface. */
public native static int addHostRoute(String interfaceName, int hostaddr);
/** Add a default route for the named interface. */
public native static int setDefaultRoute(String interfaceName, int gwayAddr);
/** Return the gateway address for the default route for the named interface. */
public native static int getDefaultRoute(String interfaceName);
/** Remove host routes that uses the named interface. */
public native static int removeHostRoutes(String interfaceName);
/** Remove the default route for the named interface. */
public native static int removeDefaultRoute(String interfaceName);
/** Reset any sockets that are connected via the named interface. */
public native static int resetConnections(String interfaceName);
/**
* Start the DHCP client daemon, in order to have it request addresses
* for the named interface, and then configure the interface with those
* addresses. This call blocks until it obtains a result (either success
* or failure) from the daemon.
* @param interfaceName the name of the interface to configure
* @param ipInfo if the request succeeds, this object is filled in with
* the IP address information.
* @return {@code true} for success, {@code false} for failure
*/
public native static boolean runDhcp(String interfaceName, DhcpInfo ipInfo);
/**
* Shut down the DHCP client daemon.
* @param interfaceName the name of the interface for which the daemon
* should be stopped
* @return {@code true} for success, {@code false} for failure
*/
public native static boolean stopDhcp(String interfaceName);
/**
* Release the current DHCP lease.
* @param interfaceName the name of the interface for which the lease should
* be released
* @return {@code true} for success, {@code false} for failure
*/
public native static boolean releaseDhcpLease(String interfaceName);
/**
* Return the last DHCP-related error message that was recorded.
* <p/>NOTE: This string is not localized, but currently it is only
* used in logging.
* @return the most recent error message, if any
*/
public native static String getDhcpError();
/**
* When static IP configuration has been specified, configure the network
* interface according to the values supplied.
* @param interfaceName the name of the interface to configure
* @param ipInfo the IP address, default gateway, and DNS server addresses
* with which to configure the interface.
* @return {@code true} for success, {@code false} for failure
*/
public static boolean configureInterface(String interfaceName, DhcpInfo ipInfo) {
return configureNative(interfaceName,
ipInfo.ipAddress,
ipInfo.netmask,
ipInfo.gateway,
ipInfo.dns1,
ipInfo.dns2);
}
private native static boolean configureNative(
String interfaceName, int ipAddress, int netmask, int gateway, int dns1, int dns2);
/**
* Look up a host name and return the result as an int. Works if the argument
* is an IP address in dot notation. Obviously, this can only be used for IPv4
* addresses.
* @param hostname the name of the host (or the IP address)
* @return the IP address as an {@code int} in network byte order
*/
public static int lookupHost(String hostname) {
InetAddress inetAddress;
try {
inetAddress = InetAddress.getByName(hostname);
} catch (UnknownHostException e) {
return -1;
}
byte[] addrBytes;
int addr;
addrBytes = inetAddress.getAddress();
addr = ((addrBytes[3] & 0xff) << 24)
| ((addrBytes[2] & 0xff) << 16)
| ((addrBytes[1] & 0xff) << 8)
| (addrBytes[0] & 0xff);
return addr;
}
}
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