ascnet/AscNet.PcapParser/PcapParser.cs

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2024-04-10 10:12:21 +00:00
using Newtonsoft.Json;
using PcapDotNet.Core;
using System.IO;
using System;
using System.Linq;
using System.Buffers.Binary;
using System.Runtime.InteropServices;
using AscNet.Common.Util;
using MessagePack;
using System.Collections.Generic;
using PcapDotNet.Packets.IpV4;
namespace AscNet.PcapParser
{
class PcapParser
{
private static readonly MessagePackSerializerOptions lz4Options = MessagePackSerializerOptions.Standard.WithCompression(MessagePackCompression.Lz4Block);
private static readonly Dictionary<IpV4Address, byte[]> buffer = new Dictionary<IpV4Address, byte[]>();
private static readonly MemoryStream memoryStream = new MemoryStream();
private static readonly List<object> packets = new List<object>();
static void Main(string[] args)
{
// Check command line
if (args.Length != 1)
{
Console.WriteLine("usage: " + Environment.GetCommandLineArgs()[0] + " <filename>");
return;
}
// Create the offline device
OfflinePacketDevice selectedDevice = new OfflinePacketDevice(args[0]);
// Open the capture file
using (PacketCommunicator communicator =
selectedDevice.Open(65536, // portion of the packet to capture
// 65536 guarantees that the whole packet will be captured on all the link layers
PacketDeviceOpenAttributes.Promiscuous, // promiscuous mode
1000)) // read timeout
{
// Read and dispatch packets until EOF is reached
communicator.ReceivePackets(0, DispatcherHandler);
}
// ProcessPackets();
Console.WriteLine($"Got {packets.Count} packet(s)");
File.WriteAllText("packets.json", JsonConvert.SerializeObject(packets));
}
private static void DispatcherHandler(PcapDotNet.Packets.Packet packet)
{
var payload = packet.Ethernet.IpV4.Tcp.Payload;
if (payload.Length < 1)
return;
byte[] bytes;
if (buffer.ContainsKey(packet.Ethernet.IpV4.Source))
{
bytes = buffer[packet.Ethernet.IpV4.Source].Concat(payload.ToArray()).ToArray();
}
else
{
bytes = payload.ToArray();
}
int readLen = 0;
while (true)
{
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if (4 > bytes.Length - readLen)
{
buffer[packet.Ethernet.IpV4.Source] = bytes.AsSpan(readLen).ToArray();
break;
}
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int len = (int)BinaryPrimitives.ReadUInt32LittleEndian(bytes.AsSpan(readLen));
readLen += Marshal.SizeOf<int>();
if (len > bytes.Length - readLen)
{
buffer[packet.Ethernet.IpV4.Source] = bytes.AsSpan(readLen - 4).ToArray();
break;
}
byte[] packetBuffer = new byte[len];
Buffer.BlockCopy(bytes, readLen, packetBuffer, 0, len);
readLen += len;
Crypto.HaruCrypt.Decrypt(packetBuffer);
try
{
var msgPackPacket = MessagePackSerializer.Deserialize<Packet>(packetBuffer, lz4Options);
var packetObj = new Dictionary<string, dynamic>
{
["No"] = msgPackPacket.No,
["Type"] = msgPackPacket.Type.ToString()
};
switch (msgPackPacket.Type)
{
case Packet.ContentType.Request:
var req = MessagePackSerializer.Deserialize<Packet.Request>(msgPackPacket.Content);
packetObj["Content"] = new
{
req.Id,
req.Name,
Content = req.Deserialize()
};
Console.WriteLine($"{req.Name}, " + JsonConvert.SerializeObject(req.Deserialize()));
break;
case Packet.ContentType.Response:
var rsp = MessagePackSerializer.Deserialize<Packet.Response>(msgPackPacket.Content);
packetObj["Content"] = new
{
rsp.Id,
rsp.Name,
Content = rsp.Deserialize()
};
Console.WriteLine($"{rsp.Name}, " + JsonConvert.SerializeObject(rsp.Deserialize()));
break;
case Packet.ContentType.Push:
var push = MessagePackSerializer.Deserialize<Packet.Push>(msgPackPacket.Content);
packetObj["Content"] = new
{
push.Name,
Content = push.Deserialize()
};
Console.WriteLine($"{push.Name}, " + JsonConvert.SerializeObject(push.Deserialize()));
break;
case Packet.ContentType.Exception:
var ex = MessagePackSerializer.Deserialize<Packet.Exception>(msgPackPacket.Content);
packetObj["Content"] = ex;
Console.WriteLine(JsonConvert.SerializeObject(ex));
break;
default:
break;
}
packets.Add(packetObj);
}
catch (Exception)
{
Console.WriteLine("len: " + len + ", pack: " + Convert.ToBase64String(packetBuffer));
byte[] rawBuf = new byte[len + 4];
Buffer.BlockCopy(bytes, (readLen - len - 4), rawBuf, 0, len + 4);
Console.WriteLine("Ended abruptly while reading, processing: " + Convert.ToBase64String(rawBuf));
break;
}
if (readLen >= bytes.Length)
{
buffer.Remove(packet.Ethernet.IpV4.Source);
break;
}
}
// print packet timestamp and packet length
/*Console.WriteLine(packet.Timestamp.ToString("yyyy-MM-dd hh:mm:ss.fff") + " length:" + payload.Length);
memoryStream.Write(payload.ToArray(), 0, payload.Length);*/
}
private static void ProcessPackets()
{
List<object> packets = new List<object>();
byte[] msBytes = memoryStream.ToArray();
int readLen = 0;
while (readLen < msBytes.Length)
{
int len = BinaryPrimitives.ReadInt32LittleEndian(msBytes.AsSpan(readLen));
readLen += Marshal.SizeOf<int>();
byte[] packetBuffer = new byte[len];
Buffer.BlockCopy(msBytes, readLen, packetBuffer, 0, len);
readLen += len;
Crypto.HaruCrypt.Decrypt(packetBuffer);
try
{
var packet = MessagePackSerializer.Deserialize<Packet>(packetBuffer, lz4Options);
var packetObj = new Dictionary<string, dynamic>
{
["No"] = packet.No,
["Type"] = packet.Type.ToString()
};
switch (packet.Type)
{
case Packet.ContentType.Request:
var req = MessagePackSerializer.Deserialize<Packet.Request>(packet.Content);
packetObj["Content"] = new
{
req.Id,
req.Name,
Content = req.Deserialize()
};
Console.WriteLine($"{req.Name}, " + JsonConvert.SerializeObject(req.Deserialize()));
break;
case Packet.ContentType.Response:
var rsp = MessagePackSerializer.Deserialize<Packet.Response>(packet.Content);
packetObj["Content"] = new
{
rsp.Id,
rsp.Name,
Content = rsp.Deserialize()
};
Console.WriteLine($"{rsp.Name}, " + JsonConvert.SerializeObject(rsp.Deserialize()));
break;
case Packet.ContentType.Push:
var push = MessagePackSerializer.Deserialize<Packet.Push>(packet.Content);
packetObj["Content"] = new
{
push.Name,
Content = push.Deserialize()
};
Console.WriteLine($"{push.Name}, " + JsonConvert.SerializeObject(push.Deserialize()));
break;
case Packet.ContentType.Exception:
var ex = MessagePackSerializer.Deserialize<Packet.Exception>(packet.Content);
packetObj["Content"] = ex;
Console.WriteLine(JsonConvert.SerializeObject(ex));
break;
default:
break;
}
packets.Add(packetObj);
}
catch (Exception)
{
Console.WriteLine("len: " + len + ", pack: " + Convert.ToBase64String(packetBuffer));
byte[] rawBuf = new byte[len + 4];
Buffer.BlockCopy(msBytes, (readLen - len - 4), rawBuf, 0, len + 4);
Console.WriteLine("Ended abruptly while reading, processing: " + Convert.ToBase64String(rawBuf));
break;
}
}
}
}
}