extrez / erina

Erina is an open source Shaiya packet analyzer

Erina

Erina it's an open source Shaiya packet editor for analiz the incoming and outcoming packets through the network.

Technical information

• Language: C++ 20 (latest)
• Application type: DLL
• Tools:
  • Shaiya Game Client
  • Shaiya Server emulator
  • Cheat Engine
  • x64dbg
• Environment: Visual Studio 2019

Features

• Show all Client packets in console.

erina's Issues

Show all incoming and outcoming packets

This issue it's created for show how to work Shaiya infrastructure between the client and server, here we call Client and Server as Actors.

How to Shaiya interact with the server?

Basically we have two Actors (Client and Server), the client connect to the server using TCP/IP Protocol, while the actor is connected, each actor can Send and Receive Packets:

When an actor send a packet, this packet can be encrypted or not:

When an actor receive a packet, can be decrypt the packet or not, after do this the actor handle the packet:

So, for show all the incoming and outcoming packets, we need search for encryption and decryption function address and inject the code just before the functions for show each packet.

Requeriments

• A debugger for your OS (We are using x64dbg for windows, because it's free and open source).
• A Shaiya game Client (We are using Episode 1 Shaiya game Client).
• A Shaiya episode 3 server (Use a ZeroSignal server release).

Roadmap

• Search Client Handle packet function.

push opcode
push packet
push length
call 0x0054D560

• Search Client send packet function.

push packet
push length
call 0x00549C10

• Search Server Handle packet function.
• Search Server Send packet function.
• Show all Client packets in console (ba9a585).
• Show all Server packets in console.