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utils_test.go
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utils_test.go
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// Copyright (c) 2019 Dropbox, Inc.
// Full license can be found in the LICENSE file.
package goebpf
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestParseNumOfPossibleCpus(t *testing.T) {
runs := map[string]int{
"0": 1,
"0-0": 1,
"0-1": 2,
"0-14": 15,
"0-1\r\n": 2,
}
for str, numExpected := range runs {
num, err := parseNumOfPossibleCpus(str)
assert.NoError(t, err)
assert.Equal(t, numExpected, num)
}
// Negative runs
runsNegative := []string{
"",
"1",
"1-1",
"1-",
"-1",
"\r\n",
}
for _, str := range runsNegative {
num, err := parseNumOfPossibleCpus(str)
assert.Error(t, err)
assert.Equal(t, 0, num)
}
}
// Negative test for closeFd()
func TestCloseFd(t *testing.T) {
err := closeFd(1111) // Some non-existing fd
assert.Error(t, err)
assert.Equal(t, "close() failed: Bad file descriptor", err.Error())
}
func TestNullTerminatedStringToString(t *testing.T) {
assert.Equal(t, "abc", NullTerminatedStringToString([]byte{'a', 'b', 'c'}))
assert.Equal(t, "def", NullTerminatedStringToString([]byte{'d', 'e', 'f', 0, 'g'}))
assert.Equal(t, "", NullTerminatedStringToString([]byte{0, 'h'}))
assert.Equal(t, "", NullTerminatedStringToString([]byte{0}))
}
func TestKeyValueToBytes(t *testing.T) {
type run struct {
val interface{}
size int
bytes []byte
}
// key, key_size, expected
runs := []run{
// regular integers
{0x0, 0, []byte{}},
{0xff, 1, []byte{0xff}},
{0xff00, 2, []byte{0, 0xff}},
{0x7ffefdfc, 4, []byte{0xfc, 0xfd, 0xfe, 0x7f}},
{0x7fffffff, 4, []byte{0xff, 0xff, 0xff, 0x7f}},
{0x7fffffffffffffff, 8, []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}},
{0x7f, 1, []byte{0x7f}},
{0x7f, 2, []byte{0x7f, 0}},
{0x7f, 4, []byte{0x7f, 0, 0, 0}},
{0x7f, 8, []byte{0x7f, 0, 0, 0, 0, 0, 0, 0}},
// negative regular integers
{-1, 8, []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
{-100, 8, []byte{0x9c, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
// fixed size integers
{uint8(0), 1, []byte{0}},
{uint8(1), 2, []byte{1, 0}},
{uint8(0x7f), 4, []byte{0x7f, 0, 0, 0}},
{uint8(0xff), 8, []byte{0xff, 0, 0, 0, 0, 0, 0, 0}},
{uint16(0), 2, []byte{0, 0}},
{uint16(0xff), 4, []byte{0xff, 0, 0, 0}},
{uint16(0xffff), 8, []byte{0xff, 0xff, 0, 0, 0, 0, 0, 0}},
{uint32(0x0), 4, []byte{0x0, 0, 0, 0}},
{uint32(0xff), 4, []byte{0xff, 0, 0, 0}},
{uint32(0xffff), 4, []byte{0xff, 0xff, 0, 0}},
{uint32(0xffffff), 4, []byte{0xff, 0xff, 0xff, 0}},
{uint32(0xffffffff), 4, []byte{0xff, 0xff, 0xff, 0xff}},
{uint32(0xffffffff), 8, []byte{0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0}},
{uint64(0), 8, []byte{0, 0, 0, 0, 0, 0, 0, 0}},
{uint64(0xffffffff), 8, []byte{0xff, 0xff, 0xff, 0xff, 0, 0, 0, 0}},
{uint64(0xffffffffffffffff), 8, []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
// strings
{"", 0, []byte{}},
{"", 1, []byte{0}},
{"a", 1, []byte{'a'}},
{"b", 4, []byte{'b', 0, 0, 0}},
{"bc", 4, []byte{'b', 'c', 0, 0}},
{"aaaa", 4, []byte{'a', 'a', 'a', 'a'}},
// byte array
{[]byte{}, 0, []byte{}},
{[]byte{}, 1, []byte{0}},
{[]byte{'a'}, 1, []byte{'a'}},
{[]byte{'b', 0, 0, 0}, 4, []byte{'b', 0, 0, 0}},
// CreateLPMtrieKey, IPv4
{CreateLPMtrieKey("192.168.1.0/24"), 8, []byte{0x18, 0x0, 0x0, 0x0, 0xc0, 0xa8, 0x01, 0x0}},
{CreateLPMtrieKey("192.168.1.55/24"), 8, []byte{0x18, 0x0, 0x0, 0x0, 0xc0, 0xa8, 0x01, 0x0}},
{CreateLPMtrieKey("192.168.1.1"), 8, []byte{0x20, 0x0, 0x0, 0x0, 0xc0, 0xa8, 0x01, 0x01}},
{CreateLPMtrieKey("0.0.0.0/0"), 8, []byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}},
// CreateLPMtrieKey, IPv6
{CreateLPMtrieKey("::/0"), 20, []byte{0x00, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}},
{CreateLPMtrieKey("::1/64"), 20, []byte{0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}},
{CreateLPMtrieKey("FE80::8329"), 20, []byte{0x80, 0x0, 0x0, 0x0, 0xFE, 0x80, 0x00, 0x00, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x83, 0x29}},
}
for _, r := range runs {
res, err := KeyValueToBytes(r.val, r.size)
assert.NoError(t, err)
assert.Equal(t, r.bytes, res)
}
}
func TestKeyValueToBytesNegative(t *testing.T) {
type run struct {
val interface{}
size int
}
runs := []run{
// regular integers
{0x1ff, 1}, // 0x1ff requires 2 bytes of storage
{0x10ffff, 2}, // at least 4 bytes
{0x10ffffffff, 4}, // at least 5 bytes
{-1, 4}, // negative integer requires 8 bytes
// typed integers
{uint8(0), 0},
{uint16(1), 1},
{uint32(1), 3},
{uint64(1), 7},
// strings (too long)
{"1", 0},
{"1dasdasdsa", 3},
// bytes (doesn't fit)
{[]byte{'a'}, 0},
{[]byte{'a', 0, 1, 2, 3}, 3},
}
for _, r := range runs {
_, err := KeyValueToBytes(r.val, r.size)
assert.Error(t, err)
}
}
func TestParseFlexibleInteger(t *testing.T) {
type run struct {
rawValue []byte
expected uint64
}
// Reversed test data from TestKeyValueToBytes()
runs := []run{
{[]byte{0xff}, 0xff},
{[]byte{0, 0xff}, 0xff00},
{[]byte{0xe8, 0x3}, 1000},
{[]byte{0xfc, 0xfd, 0xfe, 0x7f}, 0x7ffefdfc},
{[]byte{0xff, 0xff, 0xff, 0x7f}, 0x7fffffff},
{[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}, 0x7fffffffffffffff},
{[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 0xffffffffffffffff},
{[]byte{0x7f, 0, 0, 0}, 0x7f},
{[]byte{0x7f, 0, 0, 0, 0, 0, 0, 0}, 0x7f},
}
for _, r := range runs {
val := ParseFlexibleIntegerLittleEndian(r.rawValue)
assert.Equal(t, r.expected, val)
}
}
func TestParseFlexibleMultiInteger(t *testing.T) {
type run struct {
valueSize int
rawValue []byte
expected uint64
}
runs := []run{
// uint8
{1, []byte{255}, 255},
{1, []byte{255, 1}, 255 + 1},
{1, []byte{255, 1, 2}, 255 + 1 + 2},
// uint16
{2, []byte{0x01, 0x0}, 1},
{2, []byte{0xe8, 0x3}, 1000},
{2, []byte{0xe8, 0x3, 0x1, 0x0}, 1000 + 1},
// uint32
{4, []byte{0x01, 0x0, 0x0, 0x0}, 1},
{4, []byte{0xA0, 0x86, 0x01, 0x0}, 100000},
{4, []byte{0xA0, 0x86, 0x01, 0x0, 0x01, 0x0, 0x0, 0x0}, 100000 + 1},
// uint64
{8, []byte{0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0}, 0x100000000},
{8, []byte{0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x100000000 + 1},
}
for _, r := range runs {
m := &EbpfMap{
Type: MapTypePerCPUArray,
ValueSize: r.valueSize,
valueRealSize: len(r.rawValue),
}
val := m.parseFlexibleMultiInteger(r.rawValue)
assert.Equal(t, r.expected, val)
}
}