make c, cpp and rust plugins as well as their builders (thank you claude). Also add support for multi lang plugins so that we can actually fucking unload them unlike shitty golang (issue has been opened since 2015 and there is no due date for the issue...)

Overlord-Client/cmd/agent/plugins/loader_linux.go

@@ -73,6 +73,11 @@ static void so_call_onunload(void* fn) {
 	typedef void (*fn_t)(void);
 	((fn_t)fn)();
 }
+
+static const char* so_call_getruntime(void* fn) {
+	typedef const char* (*fn_t)(void);
+	return ((fn_t)fn)();
+}
 */
 import "C"
 
@@ -145,21 +150,30 @@ func loadNativePlugin(data []byte) (NativePlugin, error) {
 		return nil, err
 	}
 
+	pluginRT := "go"
+	if getRuntimeFn, err := resolve("PluginGetRuntime"); err == nil {
+		if cs := C.so_call_getruntime(getRuntimeFn); cs != nil {
+			pluginRT = C.GoString(cs)
+		}
+	}
+
 	return &soPlugin{
-		handle:     handle,
-		onLoadFn:   onLoad,
-		onEventFn:  onEvent,
-		onUnloadFn: onUnload,
+		handle:        handle,
+		onLoadFn:      onLoad,
+		onEventFn:     onEvent,
+		onUnloadFn:    onUnload,
+		pluginRuntime: pluginRT,
 	}, nil
 }
 
 type soPlugin struct {
-	handle     unsafe.Pointer
-	onLoadFn   unsafe.Pointer
-	onEventFn  unsafe.Pointer
-	onUnloadFn unsafe.Pointer
-	cbHandle   cgo.Handle
-	mu         sync.Mutex
+	handle        unsafe.Pointer
+	onLoadFn      unsafe.Pointer
+	onEventFn     unsafe.Pointer
+	onUnloadFn    unsafe.Pointer
+	cbHandle      cgo.Handle
+	pluginRuntime string
+	mu            sync.Mutex
 }
 
 func (p *soPlugin) Load(send func(string, []byte), hostInfo []byte) error {
@@ -220,8 +234,14 @@ func (p *soPlugin) Close() error {
 		p.cbHandle = 0
 	}
 	if p.handle != nil {
-		C.so_dlclose(p.handle)
+		if p.pluginRuntime != "go" {
+			C.so_dlclose(p.handle)
+		}
 		p.handle = nil
 	}
 	return nil
 }
+
+func (p *soPlugin) Runtime() string {
+	return p.pluginRuntime
+}