vm_extension_test.go

Documentation: golang.org/x/net/bpf

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package bpf_test
     6  
     7  import (
     8  	"testing"
     9  
    10  	"golang.org/x/net/bpf"
    11  )
    12  
    13  func TestVMLoadExtensionNotImplemented(t *testing.T) {
    14  	_, _, err := testVM(t, []bpf.Instruction{
    15  		bpf.LoadExtension{
    16  			Num: 100,
    17  		},
    18  		bpf.RetA{},
    19  	})
    20  	if errStr(err) != "extension 100 not implemented" {
    21  		t.Fatalf("unexpected error: %v", err)
    22  	}
    23  }
    24  
    25  func TestVMLoadExtensionExtLen(t *testing.T) {
    26  	vm, done, err := testVM(t, []bpf.Instruction{
    27  		bpf.LoadExtension{
    28  			Num: bpf.ExtLen,
    29  		},
    30  		bpf.RetA{},
    31  	})
    32  	if err != nil {
    33  		t.Fatalf("failed to load BPF program: %v", err)
    34  	}
    35  	defer done()
    36  
    37  	out, err := vm.Run([]byte{
    38  		0xff, 0xff, 0xff, 0xff,
    39  		0xff, 0xff, 0xff, 0xff,
    40  		0, 1, 2, 3,
    41  	})
    42  	if err != nil {
    43  		t.Fatalf("unexpected error while running program: %v", err)
    44  	}
    45  	if want, got := 4, out; want != got {
    46  		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
    47  			want, got)
    48  	}
    49  }
    50
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