/// <summary> Generate a pseudo-random ARP header.
/// </summary>
public static byte[] generateRandomARPHeader()
{
byte[] bytes = new byte[Packets.ARPFields.ARP_HEADER_LEN];
ArrayHelper.insertLong(bytes, Packets.ARPFields.ARP_ETH_ADDR_CODE, Packets.ARPFields.ARP_HW_TYPE_POS, Packets.ARPFields.ARP_ADDR_TYPE_LEN);
ArrayHelper.insertLong(bytes, Packets.ARPFields.ARP_IP_ADDR_CODE, Packets.ARPFields.ARP_PR_TYPE_POS, Packets.ARPFields.ARP_ADDR_TYPE_LEN);
ArrayHelper.insertLong(bytes, IPAddress.WIDTH, Packets.ARPFields.ARP_HW_LEN_POS, Packets.ARPFields.ARP_ADDR_SIZE_LEN);
ArrayHelper.insertLong(bytes, MACAddress.WIDTH, Packets.ARPFields.ARP_PR_LEN_POS, Packets.ARPFields.ARP_ADDR_SIZE_LEN);
ArrayHelper.insertLong(bytes, test(Settings.PROB_ARP_REQUEST)?Packets.ARPFields.ARP_OP_REQ_CODE:Packets.ARPFields.ARP_OP_REP_CODE, Packets.ARPFields.ARP_OP_POS, Packets.ARPFields.ARP_OP_LEN);
ArrayHelper.insertLong(bytes, MACAddress.random(), Packets.ARPFields.ARP_S_HW_ADDR_POS, MACAddress.WIDTH);
int srcAddress = IPAddress.random(Settings.SIM_NETWORK, Settings.SIM_NETMASK);
ArrayHelper.insertLong(bytes, srcAddress, Packets.ARPFields.ARP_S_PR_ADDR_POS, IPAddress.WIDTH);
ArrayHelper.insertLong(bytes, MACAddress.random(), Packets.ARPFields.ARP_T_HW_ADDR_POS, MACAddress.WIDTH);
int dstAddress = srcAddress;
int count = 0;
// cheezy way to make sure that the source and dest address aren't the same
while (dstAddress == srcAddress && count++ < randomRetryCount)
{
dstAddress = IPAddress.random(Settings.SIM_NETWORK, Settings.SIM_NETMASK);
}
ArrayHelper.insertLong(bytes, dstAddress, Packets.ARPFields.ARP_T_PR_ADDR_POS, IPAddress.WIDTH);
return(bytes);
}
/// <summary> Generate a pseudo-random ethernet header.
/// </summary>
public static byte[] generateRandomEthernetHeader()
{
byte[] bytes = new byte[Packets.EthernetFields.ETH_HEADER_LEN];
long dst = MACAddress.random();
ArrayHelper.insertLong(bytes, dst, Packets.EthernetFields.ETH_DST_POS, MACAddress.WIDTH);
long src = MACAddress.random();
ArrayHelper.insertLong(bytes, src, Packets.EthernetFields.ETH_SRC_POS, MACAddress.WIDTH);
int type = randomEthernetProtocol();
ArrayHelper.insertLong(bytes, type, Packets.EthernetFields.ETH_CODE_POS, Packets.EthernetFields.ETH_CODE_LEN);
return(bytes);
}
