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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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