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289
FFXIVClassic Map Server/packets/BasePacket.cs
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289
FFXIVClassic Map Server/packets/BasePacket.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Runtime.InteropServices;
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using System.Diagnostics;
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using FFXIVClassic_Lobby_Server.common;
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using System.IO;
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namespace FFXIVClassic_Lobby_Server.packets
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{
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[StructLayout(LayoutKind.Sequential)]
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public struct BasePacketHeader
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{
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public byte isAuthenticated;
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public byte isEncrypted;
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public ushort reserved;
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public ushort packetSize;
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public ushort numSubpackets;
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public uint unknown1; //Id?
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public uint unknown2; //Usually 0x13B
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}
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public class BasePacket{
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public const int BASEPACKET_SIZE = 0x10;
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public BasePacketHeader header;
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public byte[] data;
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public unsafe BasePacket(String path)
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{
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byte[] bytes = File.ReadAllBytes(path);
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if (bytes.Length < BASEPACKET_SIZE)
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throw new OverflowException("Packet Error: Packet was too small");
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fixed (byte* pdata = &bytes[0])
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{
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header = (BasePacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(BasePacketHeader));
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}
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if (bytes.Length < header.packetSize)
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throw new OverflowException("Packet Error: Packet size didn't equal given size");
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int packetSize = header.packetSize;
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data = new byte[packetSize - BASEPACKET_SIZE];
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Array.Copy(bytes, BASEPACKET_SIZE, data, 0, packetSize - BASEPACKET_SIZE);
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}
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public unsafe BasePacket(byte[] bytes)
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{
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if (bytes.Length < BASEPACKET_SIZE)
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throw new OverflowException("Packet Error: Packet was too small");
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fixed (byte* pdata = &bytes[0])
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{
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header = (BasePacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(BasePacketHeader));
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}
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if (bytes.Length < header.packetSize)
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throw new OverflowException("Packet Error: Packet size didn't equal given size");
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int packetSize = header.packetSize;
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data = new byte[packetSize - BASEPACKET_SIZE];
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Array.Copy(bytes, BASEPACKET_SIZE, data, 0, packetSize - BASEPACKET_SIZE);
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}
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public unsafe BasePacket(byte[] bytes, ref int offset)
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{
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if (bytes.Length < offset + BASEPACKET_SIZE)
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throw new OverflowException("Packet Error: Packet was too small");
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fixed (byte* pdata = &bytes[offset])
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{
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header = (BasePacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(BasePacketHeader));
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}
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int packetSize = header.packetSize;
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if (bytes.Length < offset + header.packetSize)
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throw new OverflowException("Packet Error: Packet size didn't equal given size");
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data = new byte[packetSize - BASEPACKET_SIZE];
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Array.Copy(bytes, offset + BASEPACKET_SIZE, data, 0, packetSize - BASEPACKET_SIZE);
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offset += packetSize;
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}
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public BasePacket(BasePacketHeader header, byte[] data)
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{
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this.header = header;
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this.data = data;
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}
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public List<SubPacket> getSubpackets()
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{
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List<SubPacket> subpackets = new List<SubPacket>(header.numSubpackets);
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int offset = 0;
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while (offset < data.Length)
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subpackets.Add(new SubPacket(data, ref offset));
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return subpackets;
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}
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public unsafe static BasePacketHeader getHeader(byte[] bytes)
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{
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BasePacketHeader header;
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if (bytes.Length < BASEPACKET_SIZE)
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throw new OverflowException("Packet Error: Packet was too small");
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fixed (byte* pdata = &bytes[0])
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{
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header = (BasePacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(BasePacketHeader));
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}
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return header;
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}
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public byte[] getHeaderBytes()
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{
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int size = Marshal.SizeOf(header);
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byte[] arr = new byte[size];
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IntPtr ptr = Marshal.AllocHGlobal(size);
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Marshal.StructureToPtr(header, ptr, true);
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Marshal.Copy(ptr, arr, 0, size);
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Marshal.FreeHGlobal(ptr);
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return arr;
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}
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public byte[] getPacketBytes()
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{
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byte[] outBytes = new byte[header.packetSize];
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Array.Copy(getHeaderBytes(), 0, outBytes, 0, BASEPACKET_SIZE);
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Array.Copy(data, 0, outBytes, BASEPACKET_SIZE, data.Length);
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return outBytes;
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}
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#region Utility Functions
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public static BasePacket createPacket(List<SubPacket> subpackets, bool isAuthed, bool isEncrypted)
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{
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//Create Header
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BasePacketHeader header = new BasePacketHeader();
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byte[] data = null;
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header.isAuthenticated = isAuthed?(byte)1:(byte)0;
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header.isEncrypted = isEncrypted?(byte)1:(byte)0;
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header.numSubpackets = (ushort)subpackets.Count;
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header.packetSize = BASEPACKET_SIZE;
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//Get packet size
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foreach (SubPacket subpacket in subpackets)
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header.packetSize += subpacket.header.subpacketSize;
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data = new byte[header.packetSize-0x10];
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//Add Subpackets
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int offset = 0;
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foreach (SubPacket subpacket in subpackets)
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{
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byte[] subpacketData = subpacket.getBytes();
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Array.Copy(subpacketData, 0, data, offset, subpacketData.Length);
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offset += (ushort)subpacketData.Length;
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}
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Debug.Assert(data != null && offset == data.Length && header.packetSize == 0x10 + offset);
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BasePacket packet = new BasePacket(header, data);
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return packet;
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}
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public static BasePacket createPacket(SubPacket subpacket, bool isAuthed, bool isEncrypted)
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{
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//Create Header
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BasePacketHeader header = new BasePacketHeader();
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byte[] data = null;
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header.isAuthenticated = isAuthed ? (byte)1 : (byte)0;
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header.isEncrypted = isEncrypted ? (byte)1 : (byte)0;
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header.numSubpackets = (ushort)1;
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header.packetSize = BASEPACKET_SIZE;
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//Get packet size
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header.packetSize += subpacket.header.subpacketSize;
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data = new byte[header.packetSize - 0x10];
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//Add Subpackets
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byte[] subpacketData = subpacket.getBytes();
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Array.Copy(subpacketData, 0, data, 0, subpacketData.Length);
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Debug.Assert(data != null);
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BasePacket packet = new BasePacket(header, data);
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return packet;
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}
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public static BasePacket createPacket(byte[] data, bool isAuthed, bool isEncrypted)
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{
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Debug.Assert(data != null);
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//Create Header
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BasePacketHeader header = new BasePacketHeader();
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header.isAuthenticated = isAuthed ? (byte)1 : (byte)0;
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header.isEncrypted = isEncrypted ? (byte)1 : (byte)0;
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header.numSubpackets = (ushort)1;
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header.packetSize = BASEPACKET_SIZE;
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//Get packet size
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header.packetSize += (ushort)data.Length;
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BasePacket packet = new BasePacket(header, data);
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return packet;
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}
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public static unsafe void encryptPacket(Blowfish blowfish, BasePacket packet)
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{
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byte[] data = packet.data;
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int size = packet.header.packetSize;
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int offset = 0;
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while (offset < data.Length) {
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if (data.Length < offset + SubPacket.SUBPACKET_SIZE)
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throw new OverflowException("Packet Error: Subpacket was too small");
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SubPacketHeader header;
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fixed (byte* pdata = &data[offset])
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{
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header = (SubPacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(SubPacketHeader));
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}
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if (data.Length < offset + header.subpacketSize)
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throw new OverflowException("Packet Error: Subpacket size didn't equal subpacket data");
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blowfish.Encipher(data, offset + 0x10, header.subpacketSize-0x10);
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offset += header.subpacketSize;
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}
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}
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public static unsafe void decryptPacket(Blowfish blowfish, ref BasePacket packet)
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{
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byte[] data = packet.data;
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int size = packet.header.packetSize;
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int offset = 0;
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while (offset < data.Length)
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{
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if (data.Length < offset + SubPacket.SUBPACKET_SIZE)
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throw new OverflowException("Packet Error: Subpacket was too small");
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SubPacketHeader header;
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fixed (byte* pdata = &data[offset])
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{
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header = (SubPacketHeader)Marshal.PtrToStructure(new IntPtr(pdata), typeof(SubPacketHeader));
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}
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if (data.Length < offset + header.subpacketSize)
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throw new OverflowException("Packet Error: Subpacket size didn't equal subpacket data");
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blowfish.Decipher(data, offset + 0x10, header.subpacketSize-0x10);
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offset += header.subpacketSize;
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}
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}
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#endregion
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public void debugPrintPacket()
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{
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#if DEBUG
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Console.BackgroundColor = ConsoleColor.DarkYellow;
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Console.WriteLine("IsAuthed: {0}, IsEncrypted: {1}, Size: 0x{2:X}, Num Subpackets: {3}", header.isAuthenticated, header.isEncrypted, header.packetSize, header.numSubpackets);
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Console.WriteLine("{0}", Utils.ByteArrayToHex(getHeaderBytes()));
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foreach (SubPacket sub in getSubpackets())
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sub.debugPrintSubPacket();
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Console.BackgroundColor = ConsoleColor.Black;
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#endif
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}
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}
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}
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