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main.go
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main.go
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package main
import "C"
import (
"encoding/binary"
"fmt"
"net"
"os"
bpf "github.com/aquasecurity/libbpfgo"
)
func main() {
bpfModule, err := bpf.NewModuleFromFile("main.bpf.o")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
defer bpfModule.Close()
err = bpfModule.BPFLoadObject()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
prog, err := bpfModule.GetProgram("sk_lookup__lookup")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
link, err := prog.AttachNetns("/proc/self/ns/net")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
if link.GetFd() == 0 {
os.Exit(-1)
}
eventsChannel := make(chan []byte)
rb, err := bpfModule.InitRingBuf("events", eventsChannel)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
rb.Start()
numberOfEventsReceived := 0
go func() {
l, err := net.Listen("tcp", "127.0.0.1:")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
go func() {
for {
l.Accept()
}
}()
for i := 0; i < 10; i++ {
c, err := net.Dial("tcp", l.Addr().String())
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
c.Write([]byte{0})
c.Close()
}
}()
recvLoop:
for {
b := <-eventsChannel
if binary.LittleEndian.Uint32(b) != 2021 {
fmt.Fprintf(os.Stderr, "invalid data retrieved\n")
os.Exit(-1)
}
numberOfEventsReceived++
if numberOfEventsReceived > 5 {
break recvLoop
}
}
rb.Stop()
rb.Close()
}