/// <summary>
/// Gets the data plan status for either a machine-wide internet connection , or the first-hop of routing to a specific destination
/// on a connection. If an IPv4/IPv6 address is not specified, this method returns the data plan status of the connection used for
/// machine-wide Internet connectivity.
/// </summary>
/// <param name="destIPAddr">
/// The destination IPv4/IPv6 address. If <see langword="null"/>, this method will instead return the data plan status of the
/// connection used for machine-wide Internet connectivity.
/// </param>
/// <returns>
/// An NLM_DATAPLAN_STATUS structure that describes the data plan status associated with a connection used to route to a destination.
/// If destIPAddr specifies a tunnel address, the first available data plan status in the interface stack is returned.
/// </returns>
public static NLM_DATAPLAN_STATUS GetConnectionDataPlanStatus(IPAddress destIPAddr = null)
{
var addr = NLM_SOCKADDR.FromIPAddress(destIPAddr);
var cost = new NLM_DATAPLAN_STATUS();
(costmgr ?? (costmgr = (INetworkCostManager)Manager))?.GetDataPlanStatus(out cost, addr);
return(cost);
}
/// <summary>
/// Gets the current cost of either a machine-wide internet connection, or the first-hop of routing to a specific destination on a
/// connection. If destIPaddr is NULL, this method instead returns the cost of the network used for machine-wide Internet connectivity.
/// </summary>
/// <param name="destIPAddr">
/// The destination IPv4/IPv6 address. If <see langword="null"/>, this method will instead return the cost associated with the
/// preferred connection used for machine Internet connectivity.
/// </param>
/// <returns>The cost of the connection.</returns>
public static NLM_CONNECTION_COST GetConnectionCost(IPAddress destIPAddr = null)
{
var addr = NLM_SOCKADDR.FromIPAddress(destIPAddr);
var cost = NLM_CONNECTION_COST.NLM_CONNECTION_COST_UNKNOWN;
(costmgr ?? (costmgr = (INetworkCostManager)Manager))?.GetCost(out cost, addr);
return(cost);
}
/// <summary>Creates a <see cref="NLM_SOCKADDR"/> from an <see cref="IPAddress"/> instance.</summary>
/// <param name="address">The IP address to encapsulate.</param>
/// <returns>A <see cref="NLM_SOCKADDR"/> instance with its data field set to either the IPv4 or IPv6 address supplied by <paramref name="address"/>.</returns>
public static NLM_SOCKADDR FromIPAddress(IPAddress address)
{
const ushort AF_INET = 2;
const ushort AF_INET6 = 23;
if (address == null)
{
throw new ArgumentNullException(nameof(address));
}
var sockAddr = new NLM_SOCKADDR {
data = new byte[dataSize]
};
// Seems to be compatible with SOCKADDR_STORAGE, which in turn is compatible with SOCKADDR_IN and SOCKADDR_IN6
using (var writer = new BinaryWriter(new MemoryStream(sockAddr.data)))
{
if (address.AddressFamily == AddressFamily.InterNetwork)
{
// AF_INT
writer.Write(AF_INET);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
}
else
{
// AF_INT6
writer.Write(AF_INET6);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
// Scope ID
writer.Write((ulong)address.ScopeId);
}
}
return(sockAddr);
}
private static NLM_SOCKADDR CreateIpv4SockAddr(IPAddress address)
{
var sockAddr = new NLM_SOCKADDR()
{
data = new byte[sockaddrDataSize]
};
using (var writer = new BinaryWriter(new MemoryStream(sockAddr.data)))
{
// AF_INT
writer.Write(AF_INET);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
}
return(sockAddr);
}
private static NLM_SOCKADDR CreateIPv6SockAddr(IPAddress address)
{
var sockAddr = new NLM_SOCKADDR()
{
data = new byte[sockaddrDataSize]
};
// Seems to be compatible with SOCKADDR_STORAGE, which in turn is compatible with SOCKADDR_IN6
using (var writer = new BinaryWriter(new MemoryStream(sockAddr.data)))
{
// AF_INT6
writer.Write(AF_INET6);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
// Scope ID
writer.Write((ulong)address.ScopeId);
}
return(sockAddr);
}
private static NLM_SOCKADDR CreateIpv4SockAddr(IPAddress address)
{
var sockAddr = new NLM_SOCKADDR() { data = new byte[sockaddrDataSize] };
using (var writer = new BinaryWriter(new MemoryStream(sockAddr.data)))
{
// AF_INT
writer.Write(AF_INET);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
}
return sockAddr;
}
private static NLM_SOCKADDR CreateIPv6SockAddr(IPAddress address)
{
var sockAddr = new NLM_SOCKADDR() { data = new byte[sockaddrDataSize] };
// Seems to be compatible with SOCKADDR_STORAGE, which in turn is compatible with SOCKADDR_IN6
using (var writer = new BinaryWriter(new MemoryStream(sockAddr.data)))
{
// AF_INT6
writer.Write(AF_INET6);
// Port
writer.Write((ushort)0);
// Flow Info
writer.Write((uint)0);
// Address
writer.Write(address.GetAddressBytes());
// Scope ID
writer.Write((ulong)address.ScopeId);
}
return sockAddr;
}