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probes.go
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probes.go
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package tracing
import (
"errors"
"fmt"
"log"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/btf"
"github.com/cilium/ebpf/link"
"github.com/cilium/ebpf/rlimit"
)
type Probes struct {
Kprobe link.Link
Tracepoint link.Link
BpfObjs bpfObjects
}
func LoadProbes() (Probes, *ebpf.Map, error) {
if err := rlimit.RemoveMemlock(); err != nil {
return Probes{}, nil, fmt.Errorf("error removing memory lock - %v", err)
}
objs := bpfObjects{}
err := loadBpfObjects(&objs, &ebpf.CollectionOptions{})
if err != nil {
var ve *ebpf.VerifierError
if errors.As(err, &ve) {
fmt.Printf("Verifier Error: %+v\n", ve)
}
return Probes{}, nil, fmt.Errorf("error loading BPF objects from go-side. %v", err)
}
log.Printf("BPF objects loaded")
// attach a kprobe and tracepoint
kp, err := link.Kprobe("tcp_data_queue", objs.bpfPrograms.HandleTcpDataQueue, nil)
if err != nil {
return Probes{}, nil, fmt.Errorf("error attaching kprobe: %v", err)
}
log.Printf("Kprobe attached successfully")
tp, err := link.Tracepoint("sock", "inet_sock_set_state", objs.bpfPrograms.HandleSockSetState, nil)
if err != nil {
return Probes{}, nil, fmt.Errorf("error attaching tracepoint: %v", err)
}
log.Printf("Tracepoint attached successfully")
// We are done with loading kprobes - clear the btf cache
btf.FlushKernelSpec()
return Probes{
Kprobe: kp,
Tracepoint: tp,
BpfObjs: objs,
}, objs.Connections, nil
}
func (objs *Probes) UnloadProbes() error {
// if any close operation fails, will continue to try closing the rest of the struct,
// and return the first error
var resultErr error
resultErr = nil
err := objs.Kprobe.Close()
if err != nil {
resultErr = err
}
err = objs.Tracepoint.Close()
if err != nil && resultErr == nil {
resultErr = err
}
err = objs.BpfObjs.Close()
if err != nil && resultErr == nil {
resultErr = err
}
return resultErr
}