private void SendIcmpReplyPacket(Packet request)
{
var icmp = request.Ethernet.IpV4.Icmp as IcmpEchoDatagram;
OSI.Layer3Packet packet = new OSI.Layer3Packet();
packet.Destination = request.Ethernet.IpV4.Source.ToString();
packet.SourceIP = _client.Configuration.IpAddress;
packet.Ttl = (byte)(request.Ethernet.IpV4.Ttl / 2);
var data = icmp.ToArray();
data = data.Subsegment(8, data.Length - 8).ToArray();
PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer icmpLayer =
new PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer
{
Checksum = null,
Identifier = icmp.Identifier,
SequenceNumber = (ushort)(icmp.SequenceNumber),
};
PcapDotNet.Packets.PayloadLayer extra = new PcapDotNet.Packets.PayloadLayer()
{
Data = new PcapDotNet.Packets.Datagram(data)
};
packet.NextLayers.Add(icmpLayer);
packet.NextLayers.Add(extra);
SendPacket(packet);
}
private void SendIcmpRequestPacket(Common.IPv4Address ip, byte ttl, ushort bytes, int seqNum, int timeout, PingResultHandler callback)
{
OSI.Layer3Packet packet = new OSI.Layer3Packet();
packet.Destination = ip.AsString;
packet.SourceIP = _client.Configuration.IpAddress;
packet.Ttl = ttl;
var data = new byte[bytes];
_random.NextBytes(data);
var shor = new byte[2];
_random.NextBytes(shor);
ushort id = BitConverter.ToUInt16(shor, 0);
// Save ping
if (CurrentPings.ContainsKey(id))
{
CurrentPings[id] = new PingRequest(callback);
}
else
{
PingRequest req = new PingRequest(callback);
req.Bytes = bytes;
CurrentPings.Add(id, req);
}
PcapDotNet.Packets.Icmp.IcmpEchoLayer icmpLayer =
new PcapDotNet.Packets.Icmp.IcmpEchoLayer
{
Checksum = null,
Identifier = id,
SequenceNumber = (ushort)(seqNum),
};
PcapDotNet.Packets.PayloadLayer extra = new PcapDotNet.Packets.PayloadLayer()
{
Data = new PcapDotNet.Packets.Datagram(data)
};
packet.NextLayers.Add(icmpLayer);
packet.NextLayers.Add(extra);
SendPacket(packet, () =>
{
CurrentPings[id].TimeStamp = DateTime.Now;
});
DateTime now = DateTime.Now;
while ((DateTime.Now - now).TotalMilliseconds < timeout)
{
if (CurrentPings[id].ReplyReceived)
{
break;
}
System.Threading.Thread.Sleep(100);
}
if (!CurrentPings[id].ReplyReceived)
{
CurrentPings[id].Callback(new PingResult(PingResultType.RequestTimedOut));
}
CurrentPings.Remove(id);
}
