adding event on unexpected_udp_traffic

Signed-off-by: h4l0gen <ks3913688@gmail.com>

events/syscall/unexpected_udp_traffic.go

@@ -0,0 +1,50 @@
+//go:build linux
+// +build linux
+
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2023 The Falco Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syscall
+
+import (
+ "fmt"
+ "os/exec"
+ "math/rand"
+ "github.com/falcosecurity/event-generator/events"
+)
+
+var _ = events.Register(GenerateUnexpectedUDPTraffic)
+
+func GenerateUnexpectedUDPTraffic(h events.Helper) error {
+ // Choose a random port number
+ port := randInt(1024, 65535)
+
+ // Execute the command to send UDP packets
+ message := "UDP traffic"
+ cmd := exec.Command("echo", message, "|", "nc", "-u", "127.0.0.1", fmt.Sprintf("%d", port))
+ err := cmd.Run()
+ if err != nil {
+ return err
+ }
+
+ // Log the event
+ h.Log().Infof("Unexpected UDP Traffic Seen on port %d", port)
+
+ return nil
+}
+
+// randInt generates a random integer between min and max.
+func randInt(min, max int) int {
+ return min + rand.Intn(max-min+1)
+}