/// <summary>
/// Returns all pcap network devices available on this machine.
/// </summary>
public static PcapDeviceList GetAllDevices()
{
IntPtr ptrDevs = IntPtr.Zero; // pointer to a PCAP_IF struct
IntPtr next = IntPtr.Zero; // pointer to a PCAP_IF struct
PCAP_IF pcap_if;
StringBuilder errbuf = new StringBuilder(256); //will hold errors
PcapDeviceList deviceList = new PcapDeviceList();
/* Retrieve the device list */
int res = pcap_findalldevs(ref ptrDevs, errbuf);
if (res == -1)
{
string err = "Error in WinPcap.GetAllDevices(): " + errbuf;
throw new Exception(err);
}
else
{ // Go through device structs and add to list
next = ptrDevs;
while (next != IntPtr.Zero)
{
pcap_if = (PCAP_IF)Marshal.PtrToStructure(next, typeof(PCAP_IF)); //Marshal memory pointer into a struct
if (NetworkDevice.IsNetworkDevice(pcap_if.Name))
{
try
{
deviceList.Add(new NetworkDevice(pcap_if));
}
catch
{
deviceList.Add(new PcapDevice(pcap_if));
}
}
else
{
deviceList.Add(new PcapDevice(pcap_if));
}
next = pcap_if.Next;
}
}
pcap_freealldevs(ptrDevs); // free buffers
return(deviceList);
}
/// <summary>
/// Resolves the MAC address of the specified IP address
/// </summary>
/// <param name="destIP">The IP address to resolve</param>
/// <param name="deviceName">The local network device name on which to send the ARP request</param>
/// <returns>The MAC address that matches to the given IP address</returns>
public string Resolve(String destIP, string deviceName)
{
string localMAC = LocalMAC;
string localIP = LocalIP;
NetworkDevice device = new NetworkDevice(DeviceName);
//if no local IP and MAC addresses specified, use the ones
//configured on the local device
if(localIP==null)
localIP = device.IpAddress;
if(LocalMAC==null)
localMAC = device.MacAddress;
//Build a new ARP request packet
ARPPacket request = BuildRequest(destIP, localMAC, localIP);
//create a "tcpdump" filter for allowing only arp replies to be read
String arpFilter = "arp and ether dst " + IPUtil.MacFormat(localMAC);
//open the device with 20ms timeout
device.PcapOpen(true, 20);
//set the filter
device.PcapSetFilter(arpFilter);
//inject the packet to the wire
device.PcapSendPacket(request);
ARPPacket reply;
while(true)
{
//read the next packet from the network
reply = (ARPPacket)device.PcapGetNextPacket();
if(reply==null)continue;
//if this is the reply we're looking for, stop
if(reply.ARPSenderProtoAddress.Equals(destIP))
{
break;
}
}
//free the device
device.PcapClose();
//return the resolved MAC address
return reply.ARPSenderHwAddress;
}
public bool Contains(NetworkDevice value)
{
// If value is not of type NetworkDevice, this will return false.
return(List.Contains(value));
}
public void Remove(NetworkDevice value)
{
List.Remove(value);
}
public void Insert(int index, NetworkDevice value)
{
List.Insert(index, value);
}
public int IndexOf(NetworkDevice value)
{
return(List.IndexOf(value));
}
public int Add(NetworkDevice value)
{
return(List.Add(value));
}
public void Remove( NetworkDevice value )
{
List.Remove( value );
}
public void Insert( int index, NetworkDevice value )
{
List.Insert( index, value );
}
public int IndexOf( NetworkDevice value )
{
return( List.IndexOf( value ) );
}
public bool Contains( NetworkDevice value )
{
// If value is not of type NetworkDevice, this will return false.
return( List.Contains( value ) );
}
public int Add( NetworkDevice value )
{
return( List.Add( value ) );
}
public static void SendTcpSyn(NetworkDevice dev)
{
byte[] bytes = new byte[54];
TCPPacket tcp = new TCPPacket(lLen, bytes, true);
//Ethernet fields
tcp.SourceHwAddress = dev.MacAddress; //Set the source mac of the local device
tcp.DestinationHwAddress = destMAC; //Set the dest MAC of the gateway
tcp.EthernetProtocol = EthernetProtocols_Fields.IP;
//IP fields
tcp.DestinationAddress = destIP; //The IP of the destination host
tcp.SourceAddress = dev.IpAddress; //The IP of the local device
tcp.IPProtocol = IPProtocols_Fields.TCP;
tcp.TimeToLive = 20;
tcp.Id = 100;
tcp.Version = 4;
tcp.IPTotalLength = bytes.Length-lLen; //Set the correct IP length
tcp.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;
//TCP fields
tcp.SourcePort = sourcePort; //The TCP source port
tcp.DestinationPort = destPort; //The TCP dest port
tcp.Syn = true; //Set the SYN flag on
tcp.WindowSize = 555;
tcp.AcknowledgementNumber = 1000;
tcp.SequenceNumber = 1000;
tcp.TCPHeaderLength = TCPFields_Fields.TCP_HEADER_LEN; //Set the correct TCP header length
//tcp.SetData( System.Text.Encoding.ASCII.GetBytes("HELLO") );
//Calculate checksums
tcp.ComputeIPChecksum();
tcp.ComputeTCPChecksum();
dev.PcapOpen(true, 20);
//Set a filter to capture only replies
dev.PcapSetFilter("ip src "+destIP+" and ip dst "+
dev.IpAddress+" and tcp src port "+destPort+" and tcp dst port "+sourcePort);
//Send the packet
Console.Write("Sending packet: "+tcp+"...");
dev.PcapSendPacket(tcp);
Console.WriteLine("Packet sent.");
//Holds the reply
Packet reply;
//Wait till you get a reply
while((reply=dev.PcapGetNextPacket())==null);
//print the reply
Console.WriteLine("Reply received: "+reply);
dev.PcapClose();
}
