Examples with Inet4Address java.net.Inet4Address used on opensource projects

Example 36 with Inet4Address

use of java.net.Inet4Address in project android_frameworks_base by DirtyUnicorns.

the class DhcpPacketTest method testIpAddress.

@SmallTest
public void testIpAddress() throws Exception {
    byte[] slash11Netmask = new byte[] { (byte) 0xff, (byte) 0xe0, 0x00, 0x00 };
    byte[] slash24Netmask = new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, 0x00 };
    byte[] invalidNetmask = new byte[] { (byte) 0xff, (byte) 0xfb, (byte) 0xff, 0x00 };
    Inet4Address example1 = v4Address("192.0.2.1");
    Inet4Address example2 = v4Address("192.0.2.43");
    // A packet without any addresses is not valid.
    checkIpAddress(null, ANY, ANY, slash24Netmask);
    // ClientIP is used iff YourIP is not present.
    checkIpAddress("192.0.2.1/24", example2, example1, slash24Netmask);
    checkIpAddress("192.0.2.43/11", example2, ANY, slash11Netmask);
    checkIpAddress("192.0.2.43/11", ANY, example2, slash11Netmask);
    // Invalid netmasks are ignored.
    checkIpAddress(null, example2, ANY, invalidNetmask);
    // If there is no netmask, implicit netmasks are used.
    checkIpAddress("192.0.2.43/24", ANY, example2, null);
}

Example 37 with Inet4Address

use of java.net.Inet4Address in project android_frameworks_base by DirtyUnicorns.

the class DhcpAckPacket method buildPacket.

/**
     * Fills in a packet with the requested ACK parameters.
     */
public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
    ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
    Inet4Address destIp = mBroadcast ? INADDR_BROADCAST : mYourIp;
    Inet4Address srcIp = mBroadcast ? INADDR_ANY : mSrcIp;
    fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result, DHCP_BOOTREPLY, mBroadcast);
    result.flip();
    return result;
}

Example 38 with Inet4Address

use of java.net.Inet4Address in project android_frameworks_base by DirtyUnicorns.

the class DhcpNakPacket method buildPacket.

/**
     * Fills in a packet with the requested NAK attributes.
     */
public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
    ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
    Inet4Address destIp = mClientIp;
    Inet4Address srcIp = mYourIp;
    fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result, DHCP_BOOTREPLY, mBroadcast);
    result.flip();
    return result;
}

Example 39 with Inet4Address

use of java.net.Inet4Address in project android_frameworks_base by DirtyUnicorns.

the class DhcpPacket method decodeFullPacket.

/**
     * Creates a concrete DhcpPacket from the supplied ByteBuffer.  The
     * buffer may have an L2 encapsulation (which is the full EthernetII
     * format starting with the source-address MAC) or an L3 encapsulation
     * (which starts with the IP header).
     * <br>
     * A subset of the optional parameters are parsed and are stored
     * in object fields.
     */
@VisibleForTesting
static DhcpPacket decodeFullPacket(ByteBuffer packet, int pktType) throws ParseException {
    // bootp parameters
    int transactionId;
    short secs;
    Inet4Address clientIp;
    Inet4Address yourIp;
    Inet4Address nextIp;
    Inet4Address relayIp;
    byte[] clientMac;
    List<Inet4Address> dnsServers = new ArrayList<>();
    // aka router
    List<Inet4Address> gateways = new ArrayList<>();
    Inet4Address serverIdentifier = null;
    Inet4Address netMask = null;
    String message = null;
    String vendorId = null;
    String vendorInfo = null;
    byte[] expectedParams = null;
    String hostName = null;
    String domainName = null;
    Inet4Address ipSrc = null;
    Inet4Address ipDst = null;
    Inet4Address bcAddr = null;
    Inet4Address requestedIp = null;
    // The following are all unsigned integers. Internally we store them as signed integers of
    // the same length because that way we're guaranteed that they can't be out of the range of
    // the unsigned field in the packet. Callers wanting to pass in an unsigned value will need
    // to cast it.
    Short mtu = null;
    Short maxMessageSize = null;
    Integer leaseTime = null;
    Integer T1 = null;
    Integer T2 = null;
    // dhcp options
    byte dhcpType = (byte) 0xFF;
    packet.order(ByteOrder.BIG_ENDIAN);
    // check to see if we need to parse L2, IP, and UDP encaps
    if (pktType == ENCAP_L2) {
        if (packet.remaining() < MIN_PACKET_LENGTH_L2) {
            throw new ParseException(DhcpErrorEvent.L2_TOO_SHORT, "L2 packet too short, %d < %d", packet.remaining(), MIN_PACKET_LENGTH_L2);
        }
        byte[] l2dst = new byte[6];
        byte[] l2src = new byte[6];
        packet.get(l2dst);
        packet.get(l2src);
        short l2type = packet.getShort();
        if (l2type != OsConstants.ETH_P_IP) {
            throw new ParseException(DhcpErrorEvent.L2_WRONG_ETH_TYPE, "Unexpected L2 type 0x%04x, expected 0x%04x", l2type, OsConstants.ETH_P_IP);
        }
    }
    if (pktType <= ENCAP_L3) {
        if (packet.remaining() < MIN_PACKET_LENGTH_L3) {
            throw new ParseException(DhcpErrorEvent.L3_TOO_SHORT, "L3 packet too short, %d < %d", packet.remaining(), MIN_PACKET_LENGTH_L3);
        }
        byte ipTypeAndLength = packet.get();
        int ipVersion = (ipTypeAndLength & 0xf0) >> 4;
        if (ipVersion != 4) {
            throw new ParseException(DhcpErrorEvent.L3_NOT_IPV4, "Invalid IP version %d", ipVersion);
        }
        // System.out.println("ipType is " + ipType);
        byte ipDiffServicesField = packet.get();
        short ipTotalLength = packet.getShort();
        short ipIdentification = packet.getShort();
        byte ipFlags = packet.get();
        byte ipFragOffset = packet.get();
        byte ipTTL = packet.get();
        byte ipProto = packet.get();
        short ipChksm = packet.getShort();
        ipSrc = readIpAddress(packet);
        ipDst = readIpAddress(packet);
        if (ipProto != IP_TYPE_UDP) {
            throw new ParseException(DhcpErrorEvent.L4_NOT_UDP, "Protocol not UDP: %d", ipProto);
        }
        // Skip options. This cannot cause us to read beyond the end of the buffer because the
        // IPv4 header cannot be more than (0x0f * 4) = 60 bytes long, and that is less than
        // MIN_PACKET_LENGTH_L3.
        int optionWords = ((ipTypeAndLength & 0x0f) - 5);
        for (int i = 0; i < optionWords; i++) {
            packet.getInt();
        }
        // assume UDP
        short udpSrcPort = packet.getShort();
        short udpDstPort = packet.getShort();
        short udpLen = packet.getShort();
        short udpChkSum = packet.getShort();
        // server-to-server packets, e.g. for relays.
        if (!isPacketToOrFromClient(udpSrcPort, udpDstPort) && !isPacketServerToServer(udpSrcPort, udpDstPort)) {
            // filter is set. http://b/26696823 .
            throw new ParseException(DhcpErrorEvent.L4_WRONG_PORT, "Unexpected UDP ports %d->%d", udpSrcPort, udpDstPort);
        }
    }
    // We need to check the length even for ENCAP_L3 because the IPv4 header is variable-length.
    if (pktType > ENCAP_BOOTP || packet.remaining() < MIN_PACKET_LENGTH_BOOTP) {
        throw new ParseException(DhcpErrorEvent.BOOTP_TOO_SHORT, "Invalid type or BOOTP packet too short, %d < %d", packet.remaining(), MIN_PACKET_LENGTH_BOOTP);
    }
    byte type = packet.get();
    byte hwType = packet.get();
    int addrLen = packet.get() & 0xff;
    byte hops = packet.get();
    transactionId = packet.getInt();
    secs = packet.getShort();
    short bootpFlags = packet.getShort();
    boolean broadcast = (bootpFlags & 0x8000) != 0;
    byte[] ipv4addr = new byte[4];
    try {
        packet.get(ipv4addr);
        clientIp = (Inet4Address) Inet4Address.getByAddress(ipv4addr);
        packet.get(ipv4addr);
        yourIp = (Inet4Address) Inet4Address.getByAddress(ipv4addr);
        packet.get(ipv4addr);
        nextIp = (Inet4Address) Inet4Address.getByAddress(ipv4addr);
        packet.get(ipv4addr);
        relayIp = (Inet4Address) Inet4Address.getByAddress(ipv4addr);
    } catch (UnknownHostException ex) {
        throw new ParseException(DhcpErrorEvent.L3_INVALID_IP, "Invalid IPv4 address: %s", Arrays.toString(ipv4addr));
    }
    // TODO: evaluate whether to make this test more liberal.
    if (addrLen > HWADDR_LEN) {
        addrLen = ETHER_BROADCAST.length;
    }
    clientMac = new byte[addrLen];
    packet.get(clientMac);
    // skip over address padding (16 octets allocated)
    packet.position(packet.position() + (16 - addrLen) + // skip server host name (64 chars)
    64 + // skip boot file name (128 chars)
    128);
    // Ensure this is a DHCP packet with a magic cookie, and not BOOTP. http://b/31850211
    if (packet.remaining() < 4) {
        throw new ParseException(DhcpErrorEvent.DHCP_NO_COOKIE, "not a DHCP message");
    }
    int dhcpMagicCookie = packet.getInt();
    if (dhcpMagicCookie != DHCP_MAGIC_COOKIE) {
        throw new ParseException(DhcpErrorEvent.DHCP_BAD_MAGIC_COOKIE, "Bad magic cookie 0x%08x, should be 0x%08x", dhcpMagicCookie, DHCP_MAGIC_COOKIE);
    }
    // parse options
    boolean notFinishedOptions = true;
    while ((packet.position() < packet.limit()) && notFinishedOptions) {
        // cannot underflow because position < limit
        final byte optionType = packet.get();
        try {
            if (optionType == DHCP_OPTION_END) {
                notFinishedOptions = false;
            } else if (optionType == DHCP_OPTION_PAD) {
            // The pad option doesn't have a length field. Nothing to do.
            } else {
                int optionLen = packet.get() & 0xFF;
                int expectedLen = 0;
                switch(optionType) {
                    case DHCP_SUBNET_MASK:
                        netMask = readIpAddress(packet);
                        expectedLen = 4;
                        break;
                    case DHCP_ROUTER:
                        for (expectedLen = 0; expectedLen < optionLen; expectedLen += 4) {
                            gateways.add(readIpAddress(packet));
                        }
                        break;
                    case DHCP_DNS_SERVER:
                        for (expectedLen = 0; expectedLen < optionLen; expectedLen += 4) {
                            dnsServers.add(readIpAddress(packet));
                        }
                        break;
                    case DHCP_HOST_NAME:
                        expectedLen = optionLen;
                        hostName = readAsciiString(packet, optionLen, false);
                        break;
                    case DHCP_MTU:
                        expectedLen = 2;
                        mtu = packet.getShort();
                        break;
                    case DHCP_DOMAIN_NAME:
                        expectedLen = optionLen;
                        domainName = readAsciiString(packet, optionLen, false);
                        break;
                    case DHCP_BROADCAST_ADDRESS:
                        bcAddr = readIpAddress(packet);
                        expectedLen = 4;
                        break;
                    case DHCP_REQUESTED_IP:
                        requestedIp = readIpAddress(packet);
                        expectedLen = 4;
                        break;
                    case DHCP_LEASE_TIME:
                        leaseTime = Integer.valueOf(packet.getInt());
                        expectedLen = 4;
                        break;
                    case DHCP_MESSAGE_TYPE:
                        dhcpType = packet.get();
                        expectedLen = 1;
                        break;
                    case DHCP_SERVER_IDENTIFIER:
                        serverIdentifier = readIpAddress(packet);
                        expectedLen = 4;
                        break;
                    case DHCP_PARAMETER_LIST:
                        expectedParams = new byte[optionLen];
                        packet.get(expectedParams);
                        expectedLen = optionLen;
                        break;
                    case DHCP_MESSAGE:
                        expectedLen = optionLen;
                        message = readAsciiString(packet, optionLen, false);
                        break;
                    case DHCP_MAX_MESSAGE_SIZE:
                        expectedLen = 2;
                        maxMessageSize = Short.valueOf(packet.getShort());
                        break;
                    case DHCP_RENEWAL_TIME:
                        expectedLen = 4;
                        T1 = Integer.valueOf(packet.getInt());
                        break;
                    case DHCP_REBINDING_TIME:
                        expectedLen = 4;
                        T2 = Integer.valueOf(packet.getInt());
                        break;
                    case DHCP_VENDOR_CLASS_ID:
                        expectedLen = optionLen;
                        // Embedded nulls are safe as this does not get passed to netd.
                        vendorId = readAsciiString(packet, optionLen, true);
                        break;
                    case DHCP_CLIENT_IDENTIFIER:
                        {
                            // Client identifier
                            byte[] id = new byte[optionLen];
                            packet.get(id);
                            expectedLen = optionLen;
                        }
                        break;
                    case DHCP_VENDOR_INFO:
                        expectedLen = optionLen;
                        // Embedded nulls are safe as this does not get passed to netd.
                        vendorInfo = readAsciiString(packet, optionLen, true);
                        break;
                    default:
                        // ignore any other parameters
                        for (int i = 0; i < optionLen; i++) {
                            expectedLen++;
                            byte throwaway = packet.get();
                        }
                }
                if (expectedLen != optionLen) {
                    final int errorCode = DhcpErrorEvent.errorCodeWithOption(DhcpErrorEvent.DHCP_INVALID_OPTION_LENGTH, optionType);
                    throw new ParseException(errorCode, "Invalid length %d for option %d, expected %d", optionLen, optionType, expectedLen);
                }
            }
        } catch (BufferUnderflowException e) {
            final int errorCode = DhcpErrorEvent.errorCodeWithOption(DhcpErrorEvent.BUFFER_UNDERFLOW, optionType);
            throw new ParseException(errorCode, "BufferUnderflowException");
        }
    }
    DhcpPacket newPacket;
    switch(dhcpType) {
        case (byte) 0xFF:
            throw new ParseException(DhcpErrorEvent.DHCP_NO_MSG_TYPE, "No DHCP message type option");
        case DHCP_MESSAGE_TYPE_DISCOVER:
            newPacket = new DhcpDiscoverPacket(transactionId, secs, clientMac, broadcast);
            break;
        case DHCP_MESSAGE_TYPE_OFFER:
            newPacket = new DhcpOfferPacket(transactionId, secs, broadcast, ipSrc, clientIp, yourIp, clientMac);
            break;
        case DHCP_MESSAGE_TYPE_REQUEST:
            newPacket = new DhcpRequestPacket(transactionId, secs, clientIp, clientMac, broadcast);
            break;
        case DHCP_MESSAGE_TYPE_DECLINE:
            newPacket = new DhcpDeclinePacket(transactionId, secs, clientIp, yourIp, nextIp, relayIp, clientMac);
            break;
        case DHCP_MESSAGE_TYPE_ACK:
            newPacket = new DhcpAckPacket(transactionId, secs, broadcast, ipSrc, clientIp, yourIp, clientMac);
            break;
        case DHCP_MESSAGE_TYPE_NAK:
            newPacket = new DhcpNakPacket(transactionId, secs, clientIp, yourIp, nextIp, relayIp, clientMac);
            break;
        case DHCP_MESSAGE_TYPE_INFORM:
            newPacket = new DhcpInformPacket(transactionId, secs, clientIp, yourIp, nextIp, relayIp, clientMac);
            break;
        default:
            throw new ParseException(DhcpErrorEvent.DHCP_UNKNOWN_MSG_TYPE, "Unimplemented DHCP type %d", dhcpType);
    }
    newPacket.mBroadcastAddress = bcAddr;
    newPacket.mDnsServers = dnsServers;
    newPacket.mDomainName = domainName;
    newPacket.mGateways = gateways;
    newPacket.mHostName = hostName;
    newPacket.mLeaseTime = leaseTime;
    newPacket.mMessage = message;
    newPacket.mMtu = mtu;
    newPacket.mRequestedIp = requestedIp;
    newPacket.mRequestedParams = expectedParams;
    newPacket.mServerIdentifier = serverIdentifier;
    newPacket.mSubnetMask = netMask;
    newPacket.mMaxMessageSize = maxMessageSize;
    newPacket.mT1 = T1;
    newPacket.mT2 = T2;
    newPacket.mVendorId = vendorId;
    newPacket.mVendorInfo = vendorInfo;
    return newPacket;
}

Example 40 with Inet4Address

use of java.net.Inet4Address in project android_frameworks_base by DirtyUnicorns.

the class DhcpPacket method addTlv.

/**
     * Adds an optional parameter containing a list of IP addresses.
     */
protected static void addTlv(ByteBuffer buf, byte type, List<Inet4Address> addrs) {
    if (addrs == null || addrs.size() == 0)
        return;
    int optionLen = 4 * addrs.size();
    if (optionLen > MAX_OPTION_LEN) {
        throw new IllegalArgumentException("DHCP option too long: " + optionLen + " vs. " + MAX_OPTION_LEN);
    }
    buf.put(type);
    buf.put((byte) (optionLen));
    for (Inet4Address addr : addrs) {
        buf.put(addr.getAddress());
    }
}