public static bool IsInSameSubnet(this System.Net.IPAddress address2, System.Net.IPAddress address, System.Net.IPAddress subnetMask)
{
System.Net.IPAddress network1 = address.GetNetworkAddress(subnetMask);
System.Net.IPAddress network2 = address2.GetNetworkAddress(subnetMask);
return(network1.Equals(network2));
}
private static bool PeekARP(string address)
{
System.Net.IPAddress adr = System.Net.IPAddress.Parse(address);
byte[] macAddr = new byte[6];
uint macAddrLen = (uint)macAddr.Length;
return(SendARP((int)adr.Address, 0, macAddr, ref macAddrLen) != 0);
}
private static bool PeekARP(System.Net.IPAddress adr)
{
byte[] macAddr = new byte[6];
uint macAddrLen = (uint)macAddr.Length;
int Ret = SendARP((int)adr.Address, 0, macAddr, ref macAddrLen);
System.Diagnostics.Trace.WriteLine(string.Format("Peeking {0} as {1}", adr.ToString(), Ret));
return(Ret == 0);
}
public static PrefixedIPv4Address NextAddress(PrefixedIPv4Address Orig)
{
System.Net.IPAddress adr = null;
System.Diagnostics.Trace.WriteLine("Parsing address" + Orig.Address);
if (!System.Net.IPAddress.TryParse(Orig.Address, out adr))
{
System.Diagnostics.Trace.WriteLine("Failed with parsing");
return(Orig);
}
long from = (adr.Address >> 24) & 0xff;
long i;
/*
* if (!PeekARP(adr))
* { // ARP not available - so just guess
* i = from + 1;
* if (i >= 254) i = 1;
* adr.Address = (adr.Address & 0xffffff) | (i << 24);
* return new PrefixedIPv4Address() { Address = adr.ToString(), PrefixLength = Orig.PrefixLength };
* }*/
// do ARP scanning, after current
for (i = from + 1; i <= 254; i++)
{
adr.Address = (adr.Address & 0xffffff) | (i << 24);
if (!PeekARP(adr))
{
break;
}
}
if (i >= 254)
{
// do ARP scanning, before current
for (i = 1; i < from; i++)
{
adr.Address = (adr.Address & 0xffffff) | (i << 24);
if (!PeekARP(adr))
{
break;
}
}
// nothing found - just guess
if (i >= from)
{
i = from + 1;
if (i >= 254)
{
i = 1;
}
adr.Address = (adr.Address & 0xffffff) | (i << 24);
}
}
return(new PrefixedIPv4Address()
{
Address = adr.ToString(), PrefixLength = Orig.PrefixLength
});
}
public static System.Net.IPAddress GetNetworkAddress(this System.Net.IPAddress address, System.Net.IPAddress subnetMask)
{
byte[] ipAdressBytes = address.GetAddressBytes();
byte[] subnetMaskBytes = subnetMask.GetAddressBytes();
if (ipAdressBytes.Length != subnetMaskBytes.Length)
{
throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
}
byte[] broadcastAddress = new byte[ipAdressBytes.Length];
for (int i = 0; i < broadcastAddress.Length; i++)
{
broadcastAddress[i] = (byte)(ipAdressBytes[i] & (subnetMaskBytes[i]));
}
return(new System.Net.IPAddress(broadcastAddress));
}
public static bool IsIPv4LinkLocal(this System.Net.IPAddress address)
{
var addrBytes = address.GetAddressBytes();
return(address.AddressFamily == AddressFamily.InterNetwork && addrBytes[0] == 169 && addrBytes[1] == 254);
}