From 23a5ca9d0782e658188fd568fc3d3aa2b828bc45 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sun, 11 Feb 2024 22:35:06 +0200
Subject: move go cmd to cmd/ioriotng

---
 cmd/ioriotng/main.go | 163 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 cmd/ioriotng/main.go

(limited to 'cmd')

diff --git a/cmd/ioriotng/main.go b/cmd/ioriotng/main.go
new file mode 100644
index 0000000..54b3c85
--- /dev/null
+++ b/cmd/ioriotng/main.go
@@ -0,0 +1,163 @@
+package main
+
+import "C"
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"fmt"
+	"log"
+	"runtime"
+	"sync"
+
+	"ioriotng/internal/debugfs"
+	"ioriotng/internal/tracepoints"
+
+	bpf "github.com/aquasecurity/libbpfgo"
+)
+
+type BpfMapper interface {
+	String() string
+}
+
+type openEvent struct {
+	FD        int32
+	OpID      int32
+	TID       uint32
+	EnterTime int64
+	ExitTime  int64
+	Filename  [256]byte
+	Comm      [16]byte
+}
+
+func (e openEvent) String() string {
+	filename := e.Filename[:]
+	comm := e.Comm[:]
+	return fmt.Sprintf("opId:%d tid:%v fd:%v filename:%s, comm:%s",
+		e.OpID, e.TID, e.FD, string(filename), string(comm))
+}
+
+type fdEvent struct {
+	FD        int32
+	OpID      int32
+	TID       uint32
+	EnterTime int64
+	ExitTime  int64
+}
+
+func (e fdEvent) String() string {
+	return fmt.Sprintf("opId:%d tid:%v fd:%v", e.OpID, e.TID, e.FD)
+}
+
+func resizeMap(module *bpf.Module, name string, size uint32) error {
+	m, err := module.GetMap("open_event_map")
+	if err != nil {
+		return err
+	}
+
+	if err = m.SetMaxEntries(size); err != nil {
+		return err
+	}
+
+	if actual := m.MaxEntries(); actual != size {
+		return fmt.Errorf("map resize failed, expected %v, actual %v", size, actual)
+	}
+
+	return nil
+}
+
+func main() {
+	// To consider for implementation!
+	log.Println(debugfs.TracepointsWithFd())
+
+	bpfModule, err := bpf.NewModuleFromFile("main.bpf.o")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer bpfModule.Close()
+
+	if err = resizeMap(bpfModule, "open_event_map", 8192); err != nil {
+		log.Fatal(err)
+	}
+	if err = resizeMap(bpfModule, "fd_event_map", 8192); err != nil {
+		log.Fatal(err)
+	}
+
+	err = bpfModule.BPFLoadObject()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if err := tracepoints.AttachSyscalls(bpfModule); err != nil {
+		log.Fatal(err)
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+		for ev := range listenToEvents[fdEvent](ctx, bpfModule, "fd_event_map") {
+			log.Println(ev)
+		}
+	}()
+	go func() {
+		defer wg.Done()
+		for ev := range listenToEvents[openEvent](ctx, bpfModule, "open_event_map") {
+			log.Println(ev)
+		}
+	}()
+
+	wg.Wait()
+	log.Println("Good bye")
+}
+
+func listenToEvents[T BpfMapper](ctx context.Context, bpfModule *bpf.Module, mapName string) <-chan T {
+	rawEventsCh := make(chan []byte)
+	rawLostCh := make(chan uint64) // TODO: Of any use this channel?
+	eventsCh := make(chan T)
+
+	pb, err := bpfModule.InitPerfBuf(mapName, rawEventsCh, rawLostCh, 4096)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	go func() {
+		defer func() {
+			pb.Stop()
+			pb.Close()
+			close(eventsCh)
+		}()
+		pb.Poll(300)
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case lost := <-rawLostCh:
+				log.Println("Lost", lost, mapName, "events. Consider increasing ring buffer!")
+			case rawEv := <-rawEventsCh:
+				var ev T
+				if err := binary.Read(bytes.NewReader(rawEv), binary.LittleEndian, &ev); err != nil {
+					log.Fatal(err)
+				}
+				eventsCh <- ev
+			}
+		}
+	}()
+
+	return eventsCh
+}
+
+func ksymArch() string {
+	switch runtime.GOARCH {
+	case "amd64":
+		return "x64"
+	case "arm64":
+		return "arm64"
+	default:
+		panic("unsupported architecture")
+	}
+}
-- 
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