github.com/kubearmor/cilium@v1.6.12/pkg/alignchecker/alignchecker_test.go (about)

     1  // Copyright 2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // +build !privileged_tests
    16  
    17  package alignchecker
    18  
    19  import (
    20  	"reflect"
    21  	"testing"
    22  
    23  	. "gopkg.in/check.v1"
    24  )
    25  
    26  type AlignCheckerSuite struct{}
    27  
    28  var _ = Suite(&AlignCheckerSuite{})
    29  
    30  func Test(t *testing.T) {
    31  	TestingT(t)
    32  }
    33  
    34  const path = "testdata/bpf_foo.o"
    35  
    36  type foo struct {
    37  	ipv6 [4]uint32 `align:"$union0"`
    38  	misc uint32    `align:"$union1"`
    39  	f    uint8     `align:"family"`
    40  	pad4 uint8     `align:"pad4"`
    41  	pad5 uint16    `align:"pad5"`
    42  }
    43  
    44  type foo2 struct {
    45  	foo
    46  }
    47  
    48  type fooInvalidSize struct {
    49  	ipv6 uint32
    50  }
    51  
    52  type fooInvalidOffset struct {
    53  	ipv6 [4]uint32 `align:"$union0"`
    54  	misc uint32    `align:"$union1"`
    55  	f    uint16    `align:"family"`
    56  	pad4 uint8     `align:"pad4"`
    57  	pad5 uint8     `align:"pad5"`
    58  }
    59  
    60  type toCheck map[string][]reflect.Type
    61  
    62  func (t *AlignCheckerSuite) TestCheckStructAlignments(c *C) {
    63  	testCases := []struct {
    64  		cName   string
    65  		goTypes []reflect.Type
    66  		err     string
    67  	}{
    68  		{
    69  			"foo",
    70  			[]reflect.Type{
    71  				reflect.TypeOf(foo{}),
    72  			},
    73  			"",
    74  		},
    75  		{
    76  			"foo",
    77  			[]reflect.Type{
    78  				reflect.TypeOf(foo2{}),
    79  			},
    80  			"",
    81  		},
    82  		{
    83  			"foo",
    84  			[]reflect.Type{
    85  				reflect.TypeOf(foo{}),
    86  				reflect.TypeOf(foo2{}),
    87  			},
    88  			"",
    89  		},
    90  		{
    91  			"foo",
    92  			[]reflect.Type{
    93  				reflect.TypeOf(fooInvalidSize{}),
    94  			},
    95  			`*.fooInvalidSize\(4\) size does not match foo\(24\)`,
    96  		},
    97  		{
    98  			"foo",
    99  			[]reflect.Type{
   100  				reflect.TypeOf(fooInvalidOffset{}),
   101  			},
   102  			`*.fooInvalidOffset.pad4 offset\(22\) does not match foo.pad4\(21\)`,
   103  		},
   104  		{
   105  			"bar",
   106  			[]reflect.Type{
   107  				reflect.TypeOf(foo{}),
   108  			},
   109  			"could not find C struct bar",
   110  		},
   111  	}
   112  
   113  	for _, tt := range testCases {
   114  		err := CheckStructAlignments(path, toCheck{tt.cName: tt.goTypes})
   115  		if tt.err == "" {
   116  			c.Assert(err, IsNil)
   117  		} else {
   118  			c.Assert(err, ErrorMatches, tt.err)
   119  		}
   120  	}
   121  }