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package ebpf
import (
"testing"
"github.com/go-quicktest/qt"
"github.com/cilium/ebpf/btf"
"github.com/cilium/ebpf/internal"
"github.com/cilium/ebpf/internal/testutils"
)
func TestVariableSpec(t *testing.T) {
file := testutils.NativeFile(t, "testdata/variables-%s.elf")
spec, err := LoadCollectionSpec(file)
qt.Assert(t, qt.IsNil(err))
qt.Assert(t, qt.IsNil(spec.Variables["hidden"]))
qt.Assert(t, qt.IsNotNil(spec.Variables["weak"]))
const want uint32 = 12345
// Update a variable in each type of data section (.bss,.data,.rodata)
qt.Assert(t, qt.IsNil(spec.Variables["var_bss"].Set(want)))
qt.Assert(t, qt.IsNil(spec.Variables["var_data"].Set(want)))
qt.Assert(t, qt.IsNil(spec.Variables["var_rodata"].Set(want)))
var v uint32
qt.Assert(t, qt.IsNil(spec.Variables["var_bss"].Get(&v)))
qt.Assert(t, qt.Equals(v, want))
qt.Assert(t, qt.IsNil(spec.Variables["var_data"].Get(&v)))
qt.Assert(t, qt.Equals(v, want))
qt.Assert(t, qt.IsNil(spec.Variables["var_rodata"].Get(&v)))
qt.Assert(t, qt.Equals(v, want))
// Composite values.
type structT struct {
A, B uint64
}
qt.Assert(t, qt.IsNil(spec.Variables["var_struct"].Set(&structT{1, 2})))
var s structT
qt.Assert(t, qt.IsNil(spec.Variables["var_struct"].Get(&s)))
qt.Assert(t, qt.Equals(s, structT{1, 2}))
}
func TestVariableSpecCopy(t *testing.T) {
file := testutils.NativeFile(t, "testdata/variables-%s.elf")
spec, err := LoadCollectionSpec(file)
if err != nil {
t.Fatal(err)
}
cpy := spec.Copy()
// Update a variable in a section with only a single variable (.rodata).
const want uint32 = 0xfefefefe
wantb := []byte{0xfe, 0xfe, 0xfe, 0xfe} // Same byte sequence regardless of endianness
qt.Assert(t, qt.IsNil(cpy.Variables["var_rodata"].Set(want)))
qt.Assert(t, qt.DeepEquals(cpy.Maps[".rodata"].Contents[0].Value.([]byte), wantb))
// Verify that the original underlying MapSpec was not modified.
zero := make([]byte, 4)
qt.Assert(t, qt.DeepEquals(spec.Maps[".rodata"].Contents[0].Value.([]byte), zero))
// Check that modifications to the VariableSpec's Type don't affect the
// underlying MapSpec's type information on either the original or the copy.
cpy.Variables["var_rodata"].Type().Name = "modified"
spec.Variables["var_rodata"].Type().Name = "modified"
qt.Assert(t, qt.Equals(cpy.Maps[".rodata"].Value.(*btf.Datasec).Vars[0].Type.(*btf.Var).Name, "var_rodata"))
qt.Assert(t, qt.Equals(spec.Maps[".rodata"].Value.(*btf.Datasec).Vars[0].Type.(*btf.Var).Name, "var_rodata"))
}
func mustReturn(tb testing.TB, prog *Program, value uint32) {
tb.Helper()
ret, _, err := prog.Test(internal.EmptyBPFContext)
qt.Assert(tb, qt.IsNil(err))
qt.Assert(tb, qt.Equals(ret, value))
}
func TestVariable(t *testing.T) {
testutils.SkipIfNotSupported(t, haveMmapableMaps())
file := testutils.NativeFile(t, "testdata/variables-%s.elf")
spec, err := LoadCollectionSpec(file)
qt.Assert(t, qt.IsNil(err))
obj := struct {
GetBSS *Program `ebpf:"get_bss"`
GetData *Program `ebpf:"get_data"`
CheckStruct *Program `ebpf:"check_struct"`
BSS *Variable `ebpf:"var_bss"`
Data *Variable `ebpf:"var_data"`
Struct *Variable `ebpf:"var_struct"`
}{}
qt.Assert(t, qt.IsNil(spec.LoadAndAssign(&obj, nil)))
t.Cleanup(func() {
obj.GetBSS.Close()
obj.GetData.Close()
obj.CheckStruct.Close()
})
mustReturn(t, obj.GetBSS, 0)
mustReturn(t, obj.GetData, 0)
mustReturn(t, obj.CheckStruct, 0)
want := uint32(4242424242)
qt.Assert(t, qt.IsNil(obj.BSS.Set(want)))
mustReturn(t, obj.GetBSS, want)
qt.Assert(t, qt.IsNil(obj.Data.Set(want)))
mustReturn(t, obj.GetData, want)
qt.Assert(t, qt.IsNil(obj.Struct.Set(&struct{ A, B uint64 }{0xa, 0xb})))
mustReturn(t, obj.CheckStruct, 1)
typ := obj.BSS.Type()
qt.Assert(t, qt.IsNotNil(typ))
i, ok := btf.As[*btf.Int](typ.Type)
qt.Assert(t, qt.IsTrue(ok))
qt.Assert(t, qt.Equals(i.Size, 4))
qt.Assert(t, qt.IsNotNil(obj.Data.Type()))
qt.Assert(t, qt.IsNotNil(obj.Struct.Type()))
}
func TestVariableConst(t *testing.T) {
testutils.SkipIfNotSupported(t, haveMmapableMaps())
file := testutils.NativeFile(t, "testdata/variables-%s.elf")
spec, err := LoadCollectionSpec(file)
qt.Assert(t, qt.IsNil(err))
want := uint32(12345)
qt.Assert(t, qt.IsNil(spec.Variables["var_rodata"].Set(want)))
obj := struct {
GetRodata *Program `ebpf:"get_rodata"`
Rodata *Variable `ebpf:"var_rodata"`
}{}
qt.Assert(t, qt.IsNil(spec.LoadAndAssign(&obj, nil)))
t.Cleanup(func() {
obj.GetRodata.Close()
})
var got uint32
qt.Assert(t, qt.IsNil(obj.Rodata.Get(&got)))
qt.Assert(t, qt.Equals(got, want))
mustReturn(t, obj.GetRodata, want)
qt.Assert(t, qt.IsTrue(obj.Rodata.ReadOnly()))
qt.Assert(t, qt.ErrorIs(obj.Rodata.Set(want), ErrReadOnly))
}
func TestVariableFallback(t *testing.T) {
// LoadAndAssign should work on Variable regardless of BPF_F_MMAPABLE support.
file := testutils.NativeFile(t, "testdata/variables-%s.elf")
spec, err := LoadCollectionSpec(file)
qt.Assert(t, qt.IsNil(err))
obj := struct {
Data *Variable `ebpf:"var_data"`
}{}
qt.Assert(t, qt.IsNil(spec.LoadAndAssign(&obj, nil)))
// Expect either success or ErrNotSupported on all systems.
u32 := uint32(0)
if err := obj.Data.Get(&u32); err != nil {
qt.Assert(t, qt.ErrorIs(err, ErrNotSupported))
}
if err := obj.Data.Set(&u32); err != nil {
qt.Assert(t, qt.ErrorIs(err, ErrNotSupported))
}
}
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