Examples with NetlinkSocket android.net.netlink.NetlinkSocket used on opensource projects

Example 11 with NetlinkSocket

use of android.net.netlink.NetlinkSocket in project android_frameworks_base by crdroidandroid.

the class IpReachabilityMonitor method probeNeighbor.

/**
     * Make the kernel perform neighbor reachability detection (IPv4 ARP or IPv6 ND)
     * for the given IP address on the specified interface index.
     *
     * @return 0 if the request was successfully passed to the kernel; otherwise return
     *         a non-zero error code.
     */
private static int probeNeighbor(int ifIndex, InetAddress ip) {
    final String msgSnippet = "probing ip=" + ip.getHostAddress() + "%" + ifIndex;
    if (DBG) {
        Log.d(TAG, msgSnippet);
    }
    final byte[] msg = RtNetlinkNeighborMessage.newNewNeighborMessage(1, ip, StructNdMsg.NUD_PROBE, ifIndex, null);
    int errno = -OsConstants.EPROTO;
    try (NetlinkSocket nlSocket = new NetlinkSocket(OsConstants.NETLINK_ROUTE)) {
        final long IO_TIMEOUT = 300L;
        nlSocket.connectToKernel();
        nlSocket.sendMessage(msg, 0, msg.length, IO_TIMEOUT);
        final ByteBuffer bytes = nlSocket.recvMessage(IO_TIMEOUT);
        // recvMessage() guaranteed to not return null if it did not throw.
        final NetlinkMessage response = NetlinkMessage.parse(bytes);
        if (response != null && response instanceof NetlinkErrorMessage && (((NetlinkErrorMessage) response).getNlMsgError() != null)) {
            errno = ((NetlinkErrorMessage) response).getNlMsgError().error;
            if (errno != 0) {
                // TODO: consider ignoring EINVAL (-22), which appears to be
                // normal when probing a neighbor for which the kernel does
                // not already have / no longer has a link layer address.
                Log.e(TAG, "Error " + msgSnippet + ", errmsg=" + response.toString());
            }
        } else {
            String errmsg;
            if (response == null) {
                bytes.position(0);
                errmsg = "raw bytes: " + NetlinkConstants.hexify(bytes);
            } else {
                errmsg = response.toString();
            }
            Log.e(TAG, "Error " + msgSnippet + ", errmsg=" + errmsg);
        }
    } catch (ErrnoException e) {
        Log.e(TAG, "Error " + msgSnippet, e);
        errno = -e.errno;
    } catch (InterruptedIOException e) {
        Log.e(TAG, "Error " + msgSnippet, e);
        errno = -OsConstants.ETIMEDOUT;
    } catch (SocketException e) {
        Log.e(TAG, "Error " + msgSnippet, e);
        errno = -OsConstants.EIO;
    }
    return errno;
}

Example 12 with NetlinkSocket

use of android.net.netlink.NetlinkSocket in project android_frameworks_base by crdroidandroid.

the class NetlinkSocketTest method testRepeatedCloseCallsAreQuiet.

public void testRepeatedCloseCallsAreQuiet() throws Exception {
    // Create a working NetlinkSocket.
    NetlinkSocket s = new NetlinkSocket(OsConstants.NETLINK_ROUTE);
    assertNotNull(s);
    s.connectToKernel();
    NetlinkSocketAddress localAddr = s.getLocalAddress();
    assertNotNull(localAddr);
    assertEquals(0, localAddr.getGroupsMask());
    assertTrue(0 != localAddr.getPortId());
    // Close once.
    s.close();
    // Test that it is closed.
    boolean expectedErrorSeen = false;
    try {
        localAddr = s.getLocalAddress();
    } catch (ErrnoException e) {
        expectedErrorSeen = true;
    }
    assertTrue(expectedErrorSeen);
    // Close once more.
    s.close();
}