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# Proxy module API
`freerdp-proxy` has an API for hooking/filtering certain events/messages.
A module can register callbacks to events, allowing to record the data and control whether to pass/ignore, or right out drop the connection.
During startup, the proxy reads its modules from the configuration:
```ini
[Plugins]
Modules = demo,cap
```
These modules are loaded in a best effort manner. Additionally there is a configuration field for modules that must be loaded,
so the proxy refuses to start if they are not found:
```ini
[Plugins]
Required = demo,cap
```
Modules must be installed as shared libraris in the `<base install>/lib/freerdp3/proxy` folder and match the pattern
`proxy-<name>-plugin.<ext>` (e.g. `proxy-demo-plugin.so`) to be found.
For security reasons loading by full path is not supported and only the installation path is used for lookup.
## Currently supported hook events
### Client
* ClientInitConnect: Called before the client tries to open a connection
* ClientUninitConnect: Called after the client has disconnected
* ClientPreConnect: Called in client PreConnect callback
* ClientPostConnect: Called in client PostConnect callback
* ClientPostDisconnect: Called in client PostDisconnect callback
* ClientX509Certificate: Called in client X509 certificate verification callback
* ClientLoginFailure: Called in client login failure callback
* ClientEndPaint: Called in client EndPaint callback
### Server
* ServerPostConnect: Called after a client has connected
* ServerPeerActivate: Called after a client has activated
* ServerChannelsInit: Called after channels are initialized
* ServerChannelsFree: Called after channels are cleaned up
* ServerSessionEnd: Called after the client connection disconnected
## Currently supported filter events
* KeyboardEvent: Keyboard event, e.g. all key press and release events
* MouseEvent: Mouse event, e.g. mouse movement and button press/release events
* ClientChannelData: Client static channel data
* ServerChannelData: Server static channel data
* DynamicChannelCreate: Dynamic channel create
* ServerFetchTargetAddr: Fetch target address (e.g. RDP TargetInfo)
* ServerPeerLogon: A peer is logging on
## Developing a new module
* Create a new file that includes `freerdp/server/proxy/proxy_modules_api.h`.
* Implement the `proxy_module_entry_point` function and register the callbacks you are interested in.
* Each callback receives two parameters:
* `connectionInfo* info` holds connection info of the raised event.
* `void* param` holds the actual event data. It should be casted by the filter to the suitable struct from `filters_api.h`.
* Each callback must return a `BOOL`:
* `FALSE`: The event will not be proxied.
* `TRUE`: The event will be proxied.
A demo can be found in `filter_demo.c`.
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