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main.go
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main.go
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package main
import "C"
import (
"encoding/binary"
"fmt"
"os"
"unsafe"
bpf "github.com/aquasecurity/libbpfgo"
)
const (
iteratorMax uint32 = 5
added uint32 = 1
checked uint32 = 2
)
var one = 1
func main() {
bpfModule, err := bpf.NewModuleFromFile("main.bpf.o")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
defer bpfModule.Close()
bpfModule.BPFLoadObject()
numbers, err := bpfModule.GetMap("numbers")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
testMap := map[uint32]uint32{}
var i uint32
for i = 0; i < iteratorMax; i++ {
testMap[i] = added
index := unsafe.Pointer(&i)
value := unsafe.Pointer(&one)
err = numbers.Update(index, value)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
}
iterator := numbers.Iterator()
for iterator.Next() {
keyBytes := iterator.Key()
key := determineHostByteOrder().Uint32(keyBytes)
val, ok := testMap[key]
if !ok {
fmt.Fprintln(os.Stderr, "Unknown key was found: %d", val)
os.Exit(-1)
}
if val != 1 {
fmt.Fprintln(os.Stderr, "Corrupted value: %d", val)
os.Exit(-1)
}
testMap[key] = checked
}
if iterator.Err() != nil {
fmt.Fprintf(os.Stderr, "iterator error: %v\n", iterator.Err())
os.Exit(-1)
}
// make sure it got everything
for k, v := range testMap {
if v != 2 {
fmt.Fprintln(os.Stderr, "Key was not found: ", k)
os.Exit(-1)
}
}
}
func determineHostByteOrder() binary.ByteOrder {
var i int32 = 0x01020304
u := unsafe.Pointer(&i)
pb := (*byte)(u)
b := *pb
if b == 0x04 {
return binary.LittleEndian
}
return binary.BigEndian
}