Proxy - Modify or delete a packet

[ancam]

Hi,

I just started this week to use the tibia api and programming otserv.

I did a custom packet on the ots, and I want to send it to the proxy and then delete it, so the client would not crash, but i'm lost!

I got this function:

cliente.IO.Proxy.SplitPacketFromServer += delegate(byte type, byte[] data)
{
System.Windows.Forms.RichTextBox.CheckForIllegalCrossThreadCalls = false; // Ignore cross thread warning 
if(type == 0xEE){ //Custom Packet
   //Lost Here....
   IncomingPacket p = new IncomingPacket(cliente);
   p.Destination = Tibia.Constants.PacketDestination.None
   p.Send();
}
}

It returns me that ToNetworkMessage its not implemented. Also tried some workarounds, but i'm really lost here.

Can someone give me a hint? I want to delete the packet 0xEE contents(summon information, health, level, pos and etc) or block it, so it wouldnt crash the cliente (since the client doesnt know that packet).

Thanks in advance

[Ash Katchup]

don't call p.Send? xD

[ancam]

How do I block it? I'm without ideas....

Thanks in advance.

[Ash Katchup]

Check this Thread:

http://tpforums.org/forum/thread-7351.html?highlight=block+packet

2. HookProxy cannot block packets, so this should be a con

Which kind are you using?

[ancam]

Check this Thread:

http://tpforums.org/forum/thread-7351.html?highlight=block+packet

2. HookProxy cannot block packets, so this should be a con

Which kind are you using?

I'm using Proxy.

private void Form1_Load(object sender, EventArgs e)
        {
            cliente = ClientChooser.ShowBox();

            cliente.Login.SetOT("localhost", 7171);

            cliente.IO.StartProxy(true);
            richTextBox1.AppendText(cliente.Version);
            cliente.IO.Proxy.AllowIncomingModification = true;
            
            cliente.IO.Proxy.SplitPacketFromServer += (ProxyBase.SplitPacket)PacketListener;
            cliente.IO.Proxy.SplitPacketFromClient += delegate(byte type, byte[] data)
            {
                System.Windows.Forms.RichTextBox.CheckForIllegalCrossThreadCalls = false;
                richTextBox1.AppendText("\nClient: " + data.ToHexString()); 
            };
        }
        public void PacketListener(byte type, byte[] data)
        {
            System.Windows.Forms.RichTextBox.CheckForIllegalCrossThreadCalls = false;
            richTextBox1.AppendText("\nServer: " + data.ToHexString()); 
            if (type == 0xEE)
            {
                IncomingPacket p = new IncomingPacket(cliente);
                
                p.Destination = Tibia.Constants.PacketDestination.None;
                return;
            }
        }

I just want to block the packet 0xEE, so it'll not reach the client and crash him.

Control.cpp 1367: unknow packet type during game (Type=238)

Is that possible?

[Dark Pallys]

You could perhaps edit the client to ignore these packets?

[ancam]

I didnt knew that it was possible, tought that proxy could handle it. How can I edit the client to ignore these packets?

[DarkstaR]

If you're getting a bad packet type during game your problem is server sided. You're either sending a packet it doesn't recognize or your sending a packet which is incorrectly formatted, leading to parsing errors. If you are trying to send a customized packet to the client and handle it effectively, check out Stepler's parser hook. It can be implemented easily. Alternatively contact me if you would like to contract out the job.

[ancam]

Thanks darkstar, but i'm not interested in hiring anyone, since its a 4fun and learning project only.

And thanks for the stepler parser hook hint, I cant believe that the first thread that I saw here about proxys was that one and I didnt noticed the content... lol.

I'll keep trying and also will be glad to post a tutorial later of how I did, so others with the same intention will make custom packets work too.

[DarkstaR]

It's not hard at all. Just make sure you let Tibia parse every packet that's not yours but block yours when it comes and return -1.