Angels Online - Packet sniffer & decryptor

Disclaimer: This project is for educational and non-commercial purposes only. I don't promote any misuse of these tools to damage official servers.

When I was a kid, I spent most of my time playing Angels Online (Angels Love in Asia). Time passed by and game changed alot. Today, official servers aren't what they were in that time. Game is slowly lossing players. While developers still support the game, west world's publisher doesn't care anymore.
Motivated by those feels and with learning purposes, my end goal is to create a server emulator to play in a local network.

Because of that, I have developed two tools to allow to work on its network protocol. A packet sniffer to capture all tcp packets sent and received by the client, and a packet decryptor that process that capture and outputs decrypted and decompressed packets. Currently I am working on a python program to view and analyze packets.

You can download Packet sniffer, decryptor and analyzer from my github account.
Packet sniffer: https://github.com/FYGonzalo/packet_sniffer/releases
*Packet decryptor: https://github.com/FYGonzalo/packet_decryptor/releases
Packet analyzer: https://github.com/FYGonzalo/packet_analyzer
* Only works on NA client. Minimal changes are needed to support other regions.

While this is not the goal of this post, I want to announce that I am working with other people to reverse the network protocol. We have already reversed the main structure of packets/messages.
We are looking for people with programming knowledge capable of using their creativity to reverse the communication protocol. Anyone willing to help please contact me on PM.

Keep in mind this project is a hobby. Don't come expecting anything more than what you can give.

thank you for sharing

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Originally Posted by fygonzalo

Disclaimer: This project is for educational and non-commercial purposes only. I don't promote any misuse of these tools to damage official servers. When I was a kid, I spent most of my time playing Angels Online (Angels Love in Asia). Time passed by and game changed alot. Today, official servers aren't what they were in that time. Game is slowly lossing players. While developers still support the game, west world's publisher doesn't care anymore.Motivated by those feels and with learning purposes, my end goal is to create a server emulator to play in a local network.Because of that, I have developed two tools to allow to work on its network protocol. A packet sniffer to capture all tcp packets sent and received by the client, and a packet decryptor that process that capture and outputs decrypted and decompressed packets. You can download Packet sniffer and Packet decryptor from my github account. Packet sniffer: https://github.com/FYGonzalo/packet_sniffer/releasesPacket decryptor: https://github.com/FYGonzalo/packet_decryptor/releases* Only works on NA client. Minimal changes are needed to support other regions.While this is not the goal of this post, I want to announce that I am working with other people to reverse the network protocol. We have already reversed the main structure of packets/messages. We are looking for people with programming knowledge capable of using their creativity to reverse the communication protocol. Anyone willing to help please contact me on PM.Keep in mind this project is a hobby. Don't come expecting anything more than what you can give.

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Does it pay anything on completion, or is this more of a hobby request?

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Originally Posted by tossaway

Does it pay anything on completion, or is this more of a hobby request?

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There is no money involved. I don't expect to create a developer team, nor be a leader, anything of that kind. I am mostly working on my own and expect to continue doing so, but anyone who want to play with this is invited.

Updated main post to add packet analyzer link.

I am working on a program to open and inspect captured traces. This program parses packets based on a description file, that you can change adding new definitions and regenerate. The end goal is to make easier the understanding of the interaction between client and server, and also make easier to reverse unknown messages.

Here is a video of how it works. Everything you see in the middle ("object tree") is parsed using the description file.
https://www.youtube.com/watch?v=SJ80x3qbfzA

Quote:

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Originally Posted by fygonzalo

Disclaimer: This project is for educational and non-commercial purposes only. I don't promote any misuse of these tools to damage official servers.

When I was a kid, I spent most of my time playing Angels Online (Angels Love in Asia). Time passed by and game changed alot. Today, official servers aren't what they were in that time. Game is slowly lossing players. While developers still support the game, west world's publisher doesn't care anymore.
Motivated by those feels and with learning purposes, my end goal is to create a server emulator to play in a local network.

Because of that, I have developed two tools to allow to work on its network protocol. A packet sniffer to capture all tcp packets sent and received by the client, and a packet decryptor that process that capture and outputs decrypted and decompressed packets. Currently I am working on a python program to view and analyze packets.

You can download Packet sniffer, decryptor and analyzer from my github account.
Packet sniffer: https://github.com/FYGonzalo/packet_sniffer/releases
*Packet decryptor: https://github.com/FYGonzalo/packet_decryptor/releases
Packet analyzer: https://github.com/FYGonzalo/packet_analyzer
* Only works on NA client. Minimal changes are needed to support other regions.

While this is not the goal of this post, I want to announce that I am working with other people to reverse the network protocol. We have already reversed the main structure of packets/messages.
We are looking for people with programming knowledge capable of using their creativity to reverse the communication protocol. Anyone willing to help please contact me on PM.

Keep in mind this project is a hobby. Don't come expecting anything more than what you can give.

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[STRIKE]Hi, can you explain what to do exactly here (how to inject a dll to a .exe file), please.[/STRIKE]

[STRIKE]Is it possible to hook this dll to a different game and collect packets?[/STRIKE]

I was able to figure out ))) I changed directory >> wrote in cmd "cd <path to where everything is>" then wrote "injector sniffer.dll nameofexecutable.exe"

and it worked.

How I understood it doesn't matter what game, it will do sniffing for everything.

Let me know if I did it correctly.
Thank you



Attachment 164576

Hey 7770988, yes, you are using it correctly. My bad for not specifying.

It is expected to work with programs that relies on windows winsock recv and send functions, I am not sure if there are some exceptions.

Keep in mind that the other two releases are target for this game and not other applications.

want to know the latest progress badly

Packet Analyzer "start.bat" opens, then give me two errors that can't find build.bat and the program doesnt open.EDIT: no errors, but the program doesnt open the packet analyzer, just nothing after execute start.bat

en otras palabras, compila los archivos desde los bat, pero no se abre el programa.

hey i need server files for create my own server. pls help

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Originally Posted by pelin4eto

thank you for sharing

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do u have angels online files? i want to make my own server pls help

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Originally Posted by poahmet31

do u have angels online files? i want to make my own server pls help

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Sorry i no have this filles only like share post...

How is that running? Interest in this project.

Hey! Just curious how this is going? I'm brand new to packet sniffing and am a very amateur coder. I had a really weird dream (for the second time...?) about getting server files for AO and starting up my own server, lol. If there is any possible way I can help, I would love to. Packet sniffing is still an art that is quite hard for me to understand, so I'm glad to learn along the way.