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Intercept, decrypt, and process Girl's Frontline game data
This is limited by the fact that I don't have clients for any server other than the global server. If anyone has clients installed for the other game servers, feel free to submit a PR or send me some JSON data so I can modify user authentication.
The JSON data that the servers send us is an absolute nightmare. Thankfully, the client seems to send sanely formatted JSON.
These are the known quirks of the server sent JSON:
"123"
, empty string, e.g., ""
, if the value is effectively nil
, or as a JSON number, e.g., 123
."1.23"
, empty string, e.g., ""
, if the value is effectively nil
, or as a JSON number, e.g., 1.23
.""
, or null
.nil
, it may be represented as an empty JSON array []
.The current solution to this problem is to use custom types in the packet definitions to facilitate the marshaling and unmarshaling of JSON data, which is far from ideal.
My current idea to remove the custom types from the packet definitions themselves and at runtime, create a dynamic struct based on the static packet definition but with the custom types in them and marshal the data into that.
Load the url block list from a file and provide an interface for mods to use a config file of their own.
Should i reimplement modules as loadable shared libraries? the basic idea is stolen from here:
You can write a plugin to change the way YClass reads memory. To do that you will need a shared library(.dll or .so) that exports following functions
fn yc_attach(process_id: u32) -> u32 - Called when attaching to a process.
fn yc_read(address: usize, buffer: *mut u8, buffer_size: usize) -> u32 - Called when reading memory(very frequently).
fn yc_can_read(address: usize) -> bool - Called to check if address is "readable", i.e. a pointer.
fn yc_detach() - Called when detaching from a process.
After its done, put your library at ./plugin.ycpl or specify the path under plugin_path key in your config.```
In game packets (SFairyAdjust, SEquipDevelop), fairy talents are referred to by their id in the passive_skill
field. The FairyInfo
struct should offer a method for getting the string representation of the talent id.
Mods can already request a priority on their hook, but order is not enforced when generating hooks currently.
The game updates off AWS using a HTTPS connection, capability to generate a unique CA cert and MITM https connections is already written in and can be activated with the -https
flag. Further analysis of update traffic is required.
For the global server, it seems like the patches are all pulled off s3.us-east-2.amazonaws.com:443/gf1-file-server/
.
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