mirror of
https://github.com/modernuo/ModernUO
synced 2026-08-11 22:23:06 -04:00
6f444488a5
### Summary - Fixes various exploits that can crash the shard when the client misbehaves. - Clients will now be disconnected if they send packets that are marked as out of game only (new flag), while they are in-game. > [!Note] > **Developer Note** > Added an `OutOfGameOnly` which should be used to flag packets as only available out of the game. > This is the opposite of, yet not the converse to `InGameOnly`.
75 lines
2.7 KiB
C#
75 lines
2.7 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: ProtocolExtension.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System.Buffers;
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namespace Server.Network
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{
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public interface IProtocolExtensionsInfo
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{
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public int PacketId { get; }
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}
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public static class ProtocolExtensions<T> where T : struct, IProtocolExtensionsInfo
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{
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private static readonly PacketHandler[] packetHandlers = new PacketHandler[0x100];
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private static int packetId;
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public static unsafe PacketHandler[] Register(T info)
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{
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packetId = info.PacketId;
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IncomingPackets.Register(packetId, 0, false, &DecodeBundledPacket);
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return packetHandlers;
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}
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private static unsafe void DecodeBundledPacket(NetState state, SpanReader reader)
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{
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int cmd = reader.ReadByte();
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PacketHandler ph = packetHandlers[cmd];
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if (ph == null)
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{
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return;
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}
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var from = state.Mobile;
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if (ph.InGameOnly)
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{
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if (from == null)
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{
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state.Disconnect($"Received packet 0x{packetId:X2}x{cmd:X2} before having been attached to a mobile.");
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return;
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}
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if (from.Deleted)
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{
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state.Disconnect($"Received packet 0x{packetId:X2}x{cmd:X2} after having been attached to a deleted mobile.");
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return;
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}
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}
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if (ph.OutOfGameOnly && from?.Deleted == false)
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{
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state.Disconnect($"Received packet 0x{packetId:X2}x{cmd:X2} after having been attached to a mobile.");
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return;
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}
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ph.OnReceive(state, reader);
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}
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}
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}
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