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package link
import (
"io"
"testing"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/internal/testutils"
)
func TestIter(t *testing.T) {
testutils.SkipOnOldKernel(t, "5.9", "bpf_map iter")
prog := mustLoadProgram(t, ebpf.Tracing, ebpf.AttachTraceIter, "bpf_map")
it, err := AttachIter(IterOptions{
Program: prog,
})
if err != nil {
t.Fatal("Can't create iter:", err)
}
file, err := it.Open()
if err != nil {
t.Fatal("Can't open iter instance:", err)
}
defer file.Close()
contents, err := io.ReadAll(file)
if err != nil {
t.Fatal(err)
}
if len(contents) != 0 {
t.Error("Non-empty output from no-op iterator:", string(contents))
}
testLink(t, it, prog)
}
func TestIterMapElements(t *testing.T) {
testutils.SkipOnOldKernel(t, "5.9", "bpf_map_elem iter")
prog := mustLoadProgram(t, ebpf.Tracing, ebpf.AttachTraceIter, "bpf_map_elem")
arr, err := ebpf.NewMap(&ebpf.MapSpec{
Type: ebpf.Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 3,
})
if err != nil {
t.Fatal(err)
}
defer arr.Close()
it, err := AttachIter(IterOptions{
Program: prog,
Map: arr,
})
if err != nil {
t.Fatal("Can't create iter:", err)
}
defer it.Close()
file, err := it.Open()
if err != nil {
t.Fatal("Can't open iter instance:", err)
}
defer file.Close()
contents, err := io.ReadAll(file)
if err != nil {
t.Fatal(err)
}
if len(contents) != 0 {
t.Error("Non-empty output from no-op iterator:", string(contents))
}
}
func TestUDPIter(t *testing.T) {
// Introduced by 5788b3a07fc5 ("net: bpf: Implement bpf iterator for udp")
testutils.SkipOnOldKernel(t, "5.9", "udp iter")
prog := mustLoadProgram(t, ebpf.Tracing, ebpf.AttachTraceIter, "udp")
it, err := AttachIter(IterOptions{
Program: prog,
})
if err != nil {
t.Fatal("Can't create iter:", err)
}
file, err := it.Open()
if err != nil {
t.Fatal("Can't open iter instance:", err)
}
defer file.Close()
contents, err := io.ReadAll(file)
if err != nil {
t.Fatal(err)
}
if len(contents) != 0 {
t.Error("Non-empty output from no-op iterator:", string(contents))
}
testLink(t, it, prog)
}
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