@Override
public String toString() {
return toStringHelper(getClass())
.add("hardwareType", Short.toString(hardwareType))
.add("protocolType", Short.toString(protocolType))
.add("hardwareAddressLength", Byte.toString(hardwareAddressLength))
.add("protocolAddressLength", Byte.toString(protocolAddressLength))
.add("opCode", Short.toString(opCode))
.add("senderHardwareAddress", MacAddress.valueOf(senderHardwareAddress))
.add("senderProtocolAddress", Ip4Address.valueOf(senderProtocolAddress))
.add("targetHardwareAddress", MacAddress.valueOf(targetHardwareAddress))
.add("targetProtocolAddress", Ip4Address.valueOf(targetProtocolAddress))
.toString();
}
/**
* Converts a CIDR (slash) notation string (e.g., "10.1.0.0/16") into an IPv4 prefix.
*
* @param address an IP prefix in string form (e.g., "10.1.0.0/16")
* @return an IPv4 prefix
* @throws IllegalArgumentException if the arguments are invalid
*/
public static Ip4Prefix valueOf(String address) {
final String[] parts = address.split("/");
if (parts.length != 2) {
String msg =
"Malformed IPv4 prefix string: " + address + "." + "Address must take form \"x.x.x.x/y\"";
throw new IllegalArgumentException(msg);
}
Ip4Address ipAddress = Ip4Address.valueOf(parts[0]);
int prefixLength = Integer.parseInt(parts[1]);
return new Ip4Prefix(ipAddress, prefixLength);
}
/**
* Builds an ARP reply based on a request.
*
* @param srcIp the IP address to use as the reply source
* @param srcMac the MAC address to use as the reply source
* @param request the ARP request we got
* @return an Ethernet frame containing the ARP reply
*/
public static Ethernet buildArpReply(Ip4Address srcIp, MacAddress srcMac, Ethernet request) {
Ethernet eth = new Ethernet();
eth.setDestinationMACAddress(request.getSourceMAC());
eth.setSourceMACAddress(srcMac);
eth.setEtherType(Ethernet.TYPE_ARP);
eth.setVlanID(request.getVlanID());
ARP arp = new ARP();
arp.setOpCode(ARP.OP_REPLY);
arp.setProtocolType(ARP.PROTO_TYPE_IP);
arp.setHardwareType(ARP.HW_TYPE_ETHERNET);
arp.setProtocolAddressLength((byte) Ip4Address.BYTE_LENGTH);
arp.setHardwareAddressLength((byte) Ethernet.DATALAYER_ADDRESS_LENGTH);
arp.setSenderHardwareAddress(srcMac.toBytes());
arp.setTargetHardwareAddress(request.getSourceMACAddress());
arp.setTargetProtocolAddress(((ARP) request.getPayload()).getSenderProtocolAddress());
arp.setSenderProtocolAddress(srcIp.toInt());
eth.setPayload(arp);
return eth;
}
/**
* Converts a byte array and a prefix length into an IPv4 prefix.
*
* @param address the IPv4 address value stored in network byte order
* @param prefixLength the prefix length
* @return an IPv4 prefix
* @throws IllegalArgumentException if the prefix length value is invalid
*/
public static Ip4Prefix valueOf(byte[] address, int prefixLength) {
return new Ip4Prefix(Ip4Address.valueOf(address), prefixLength);
}
