Question

I’m trying to send a WOL package on all interfaces in order to wake up the gateway(which is the DHCP server, so the machine won’t have an IP yet).

And it seems that I can only bind sockets to IP and port pairs…

So the question is: How can a create a socket(or something else) that is bound to a NIC that has no IP? (Any languge is ok. c# is prefered)

@ctacke: I know that WOL is done by MAC address… My problem is that windows only sends UDP broadcasts on the NIC what Windows considers to be the primary NIC (which is not even the NIC with the default route on my Vista machine). And I can not seems to find a way to bind a socket to an interface which has no IP address. (like DHCP clients do this)

@Arnout: Why not? The clients know the MAC address of the gateway. I just want a send a WOL packet like a DHCP client does initially…(DHCP discover packets claim to come from 0.0.0.0) I don’t mind if I have to construct the whole packet byte by byte…

Answer 1

It seems that I have found a solution. One can use winpcap to inject packets to any interface. And there is good wrapper for .net: http://www.tamirgal.com/home/dev.aspx?Item=SharpPcap

(I would have prefered a solution which requires no extra libraries to be installed…)

UPDATE: Here is what I came up for sending a WOL packet on all interfaces:

//You need SharpPcap for this to work  private void WakeFunction(string MAC_ADDRESS) {     /* Retrieve the device list */     Tamir.IPLib.PcapDeviceList devices = Tamir.IPLib.SharpPcap.GetAllDevices();      /*If no device exists, print error */     if (devices.Count < 1)     {         Console.WriteLine('No device found on this machine');         return;     }      foreach (NetworkDevice device in devices)     {         //Open the device         device.PcapOpen();          //A magic packet is a broadcast frame containing anywhere within its payload: 6 bytes of ones         //(resulting in hexadecimal FF FF FF FF FF FF), followed by sixteen repetitions           byte[] bytes = new byte[120];         int counter = 0;         for (int y = 0; y < 6; y++)             bytes[counter++] = 0xFF;         //now repeat MAC 16 times         for (int y = 0; y < 16; y++)         {             int i = 0;             for (int z = 0; z < 6; z++)             {                 bytes[counter++] =                     byte.Parse(MAC_ADDRESS.Substring(i, 2),                     NumberStyles.HexNumber);                 i += 2;             }         }          byte[] etherheader = new byte[54];//If you say so...         var myPacket = new Tamir.IPLib.Packets.UDPPacket(EthernetFields_Fields.ETH_HEADER_LEN, etherheader);          //Ethernet         myPacket.DestinationHwAddress = 'FFFFFFFFFFFFF';//it's buggy if you don't have lots of 'F's... (I don't really understand it...)         try { myPacket.SourceHwAddress = device.MacAddress; }         catch { myPacket.SourceHwAddress = '0ABCDEF'; }//whatever         myPacket.EthernetProtocol = EthernetProtocols_Fields.IP;          //IP         myPacket.DestinationAddress = '255.255.255.255';         try { myPacket.SourceAddress = device.IpAddress; }         catch { myPacket.SourceAddress = '0.0.0.0'; }         myPacket.IPProtocol = IPProtocols_Fields.UDP;         myPacket.TimeToLive = 50;         myPacket.Id = 100;         myPacket.Version = 4;         myPacket.IPTotalLength = bytes.Length - EthernetFields_Fields.ETH_HEADER_LEN;           //Set the correct IP length         myPacket.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;          //UDP         myPacket.SourcePort = 9;                         myPacket.DestinationPort = 9;                    myPacket.UDPLength = UDPFields_Fields.UDP_HEADER_LEN;           myPacket.UDPData = bytes;         myPacket.ComputeIPChecksum();         myPacket.ComputeUDPChecksum();          try         {             //Send the packet out the network device             device.PcapSendPacket(myPacket);         }         catch (Exception e)         {             Console.WriteLine(e.Message);         }          device.PcapClose();     } }