C＃Pcap.Net發送TCP，HTTP數據包不工作

Question

我將使用Pcap.Net 0.10.0（67076）發送TCP或HTTP數據包但不工作，只能使用UDP數據包？我可以看到UDP數據包顯示在TCPViewer中，但現在顯示爲TCP或HTTP數據包。

我使用Windows 7 64位，但我真的構建應用程序的x86平臺。

這是我的代碼。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using PcapDotNet.Base; 
using PcapDotNet.Core; 
using PcapDotNet.Packets; 
using PcapDotNet.Packets.Arp; 
using PcapDotNet.Packets.Dns; 
using PcapDotNet.Packets.Ethernet; 
using PcapDotNet.Packets.Gre; 
using PcapDotNet.Packets.Http; 
using PcapDotNet.Packets.Icmp; 
using PcapDotNet.Packets.Igmp; 
using PcapDotNet.Packets.IpV4; 
using PcapDotNet.Packets.Transport; 
using System.Text; 

namespace PcapTest 
{ 
class Program 
{ 
    static void Main(string[] args) 
    { 
     // Retrieve the device list from the local machine 
     IList<LivePacketDevice> allDevices = LivePacketDevice.AllLocalMachine; 

     if (allDevices.Count == 0) 
     { 
      Console.WriteLine("No interfaces found! Make sure WinPcap is installed."); 
      return; 
     } 

     // Print the list 
     for (int i = 0; i != allDevices.Count; ++i) 
     { 
      LivePacketDevice device = allDevices[i]; 
      Console.Write(String.Format("{0}. {1}", (i + 1), device.Name)); 
      Console.WriteLine(device.Description != null ? String.Format(" ({0})", device.Description) : " (No description available)"); 
     } 

     int deviceIndex = 0; 
     do 
     { 
      Console.WriteLine(String.Format("Enter the interface number (1-{0}):", allDevices.Count)); 
      string deviceIndexString = Console.ReadLine(); 
      if (!int.TryParse(deviceIndexString, out deviceIndex) || 
       deviceIndex < 1 || deviceIndex > allDevices.Count) 
      { 
       deviceIndex = 0; 
      } 
     } while (deviceIndex == 0); 

     // Take the selected adapter 
     PacketDevice selectedDevice = allDevices[deviceIndex - 1]; 

     // Open the output device 
     using (PacketCommunicator communicator = selectedDevice.Open(69559, PacketDeviceOpenAttributes.Promiscuous, 1000)) // read timeout 
     { 
      communicator.SendPacket(BuildHttpPacket()); 
     } 
     Console.ReadKey(); 
    } 

    private static Packet BuildHttpPacket() 
    { 
     EthernetLayer ethernetLayer = 
      new EthernetLayer 
      { 
       Source = new MacAddress("01:01:01:01:01:01"), 
       Destination = new MacAddress("02:02:02:02:02:02"), 
       EtherType = EthernetType.None, // Will be filled automatically. 
      }; 

     IpV4Layer ipV4Layer = 
      new IpV4Layer 
      { 
       Source = new IpV4Address("99.99.99.99"), 
       CurrentDestination = new IpV4Address("111.90.147.168"), 
       Fragmentation = IpV4Fragmentation.None, 
       HeaderChecksum = null, // Will be filled automatically. 
       Identification = 123, 
       Options = IpV4Options.None, 
       Protocol = null, // Will be filled automatically. 
       Ttl = 100, 
       TypeOfService = 0, 
      }; 

     TcpLayer tcpLayer = 
      new TcpLayer 
      { 
       SourcePort = 4050, 
       DestinationPort = 80, 
       Checksum = null, // Will be filled automatically. 
       SequenceNumber = 100, 
       AcknowledgmentNumber = 50, 
       ControlBits = TcpControlBits.Acknowledgment, 
       Window = 100, 
       UrgentPointer = 0, 
       Options = TcpOptions.None, 
      }; 

     HttpRequestLayer httpLayer = 
      new HttpRequestLayer 
      { 
       Version = HttpVersion.Version11, 
       Header = new HttpHeader(new HttpContentLengthField(11)), 
       Body = new Datagram(Encoding.ASCII.GetBytes("hello world")), 
       Method = new HttpRequestMethod(HttpRequestKnownMethod.Get), 
       Uri = @"http://pcapdot.net/", 
      }; 

     PacketBuilder builder = new PacketBuilder(ethernetLayer, ipV4Layer, tcpLayer, httpLayer); 

     return builder.Build(DateTime.Now); 
    } 
} 
} 

Answer 1

如果你想看到服務器的請求，你應該建立一個有效的TCP連接。這包括一個TCP三次握手（SYN，SYN-ACK，ACK）。

如果您只是發送HTTP請求，服務器將忽略它，因爲它會忽略超出有效TCP連接的數據包。

見多http://en.wikipedia.org/wiki/Transmission_Control_Protocol