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hostmask_test.go
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hostmask_test.go
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package iplib
import (
"bytes"
"net"
"testing"
"lukechampine.com/uint128"
)
var hostMaskTests = []struct {
masklen int
mask net.IPMask
bpos int
bvalue byte
}{
{0, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, -1, 0x00},
{1, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80}, 15, 0x80},
{2, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0}, 15, 0xc0},
{3, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe0}, 15, 0xe0},
{4, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf0}, 15, 0xf0},
{5, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf8}, 15, 0xf8},
{6, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfc}, 15, 0xfc},
{7, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfe}, 15, 0xfe},
{8, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff}, 15, 0xff},
{16, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff}, 14, 0xff},
{32, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff}, 12, 0xff},
{64, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 8, 0xff},
{58, net.IPMask{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 8, 0xc0},
{127, net.IPMask{0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, 0xfe},
{128, net.IPMask{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, 0xff},
}
func TestNewHostMask(t *testing.T) {
for i, tt := range hostMaskTests {
mask := NewHostMask(tt.masklen)
v := bytes.Compare(mask, tt.mask)
if v != 0 {
t.Errorf("[%d] got wrong mask value for masklen %d: want %v got %v", i, tt.masklen, tt.mask, mask)
}
masklen, _ := mask.Size()
if masklen != tt.masklen {
t.Errorf("[%d] got wrong mask length: want %d got %d", i, tt.masklen, masklen)
}
bvalue, bpos := mask.BoundaryByte()
if bvalue != tt.bvalue {
t.Errorf("[%d] got wrong boundary byte value: want '%x' got '%x'", i, tt.bvalue, bvalue)
}
if bpos != tt.bpos {
t.Errorf("[%d] got wrong boundary byte position: want %d got %d", i, tt.bpos, bpos)
}
}
}
var boundaryByteDeltaTests = []struct {
bb byte
bv byte
count uint128.Uint128
decrval byte
decrcount uint128.Uint128
incrval byte
incrcount uint128.Uint128
}{
{0x00, 0x00, uint128.From64(0), 0x00, uint128.From64(0), 0x00, uint128.From64(0)},
{0x00, 0x00, uint128.From64(1), 0xff, uint128.From64(1), 0x01, uint128.From64(0)},
{0x00, 0x01, uint128.From64(0), 0x01, uint128.From64(0), 0x01, uint128.From64(0)},
{0x00, 0x01, uint128.From64(1), 0x00, uint128.From64(0), 0x02, uint128.From64(0)},
{0x00, 0x09, uint128.From64(1024), 0x09, uint128.From64(4), 0x09, uint128.From64(4)},
{0x80, 0x09, uint128.From64(1024), 0x09, uint128.From64(8), 0x09, uint128.From64(8)},
{0x40, 0x09, uint128.From64(1024), 0x89, uint128.From64(6), 0x49, uint128.From64(5)},
{0x20, 0x09, uint128.From64(1024), 0x69, uint128.From64(5), 0x89, uint128.From64(4)},
{0x10, 0x09, uint128.From64(1024), 0xb9, uint128.From64(5), 0x49, uint128.From64(4)},
{0x08, 0x09, uint128.From64(1024), 0xe1, uint128.From64(5), 0x29, uint128.From64(4)},
}
func Test_decrementBoundaryByte(t *testing.T) {
for i, tt := range boundaryByteDeltaTests {
decrcount, decrval := decrementBoundaryByte(tt.bb, tt.bv, tt.count)
if decrval != tt.decrval {
t.Errorf("[%d] got wrong output byte: want 0x%02x, got 0x%02x", i, tt.decrval, decrval)
}
if v := decrcount.Cmp(tt.decrcount); v != 0 {
t.Errorf("[%d] got wrong output count: want %d, got %d", i, tt.decrcount, decrcount)
}
}
}
func Test_incrementBoundaryByte(t *testing.T) {
for i, tt := range boundaryByteDeltaTests {
count, incrval := incrementBoundaryByte(tt.bb, tt.bv, tt.count)
if incrval != tt.incrval {
t.Errorf("[%d] got wrong output byte: want 0x%02x, got 0x%02x", i, tt.incrval, incrval)
}
if v := count.Cmp(tt.incrcount); v != 0 {
t.Errorf("[%d] got wrong output count: want %d, got %d", i, tt.incrcount, count)
}
}
}
var unmaskedBytesDeltaTest = []struct {
inval []byte
incount uint128.Uint128
decrval []byte
incrval []byte
}{
{[]byte{0, 255}, uint128.From64(255), []byte{0, 0}, []byte{1, 254}},
{[]byte{254, 1}, uint128.From64(1), []byte{254, 0}, []byte{254, 2}},
{[]byte{0, 255}, uint128.From64(1), []byte{0, 254}, []byte{1, 0}},
}
func Test_decrementUnmaskedBytes(t *testing.T) {
for i, tt := range unmaskedBytesDeltaTest {
decrval := decrementUnmaskedBytes(tt.inval, tt.incount)
if v := bytes.Compare(tt.decrval, decrval); v != 0 {
t.Errorf("[%d] got wrong output array: want %+v, got %+v", i, tt.decrval, decrval)
}
}
}
func Test_incrementUnmaskedBytes(t *testing.T) {
for i, tt := range unmaskedBytesDeltaTest {
incrval := incrementUnmaskedBytes(tt.inval, tt.incount)
if v := bytes.Compare(tt.incrval, incrval); v != 0 {
t.Errorf("[%d] got wrong output array: want %+v, got %+v", i, tt.incrval, incrval)
}
}
}
var IPHostmaskDeltaTests = []struct {
ipaddr net.IP
hostmask int
decr net.IP
decrErr error
incr net.IP
incrErr error
prev net.IP
prevErr error
next net.IP
nextErr error
}{
{ // 0
net.ParseIP("2001:db8:1234:5678::"), 0,
net.ParseIP("2001:db8:1234:5677:ffff:ffff:ffff:fc18"), nil,
net.ParseIP("2001:db8:1234:5678::3e8"), nil,
net.ParseIP("2001:db8:1234:5677:ffff:ffff:ffff:ffff"), nil,
net.ParseIP("2001:db8:1234:5678::1"), nil,
}, { // 1
net.ParseIP("2001:db8:1234:5678:9900::"), 56,
net.ParseIP("2001:db8:1234:5674:b100::"), nil,
net.ParseIP("2001:db8:1234:567c:8100::"), nil,
net.ParseIP("2001:db8:1234:5678:9800::"), nil,
net.ParseIP("2001:db8:1234:5678:9a00::"), nil,
}, { // 2
net.ParseIP("2001:db8:1234:5678:ff00::"), 56,
net.ParseIP("2001:db8:1234:5675:1700::"), nil,
net.ParseIP("2001:db8:1234:567c:e700::"), nil,
net.ParseIP("2001:db8:1234:5678:fe00::"), nil,
net.ParseIP("2001:db8:1234:5679::"), nil,
}, { // 3
net.ParseIP("::"), 56,
net.ParseIP(""), ErrAddressOutOfRange,
net.ParseIP("::3:e800:0:0:0"), nil,
net.IP{}, ErrAddressOutOfRange,
net.ParseIP("::100:0:0:0"), nil,
}, { // 4
net.ParseIP("ffff:ffff:ffff:ffff:ff00::"), 56,
net.ParseIP("ffff:ffff:ffff:fffc:1700::"), nil,
net.IP{}, ErrAddressOutOfRange,
net.ParseIP("ffff:ffff:ffff:ffff:fe00::"), nil,
net.IP{}, ErrAddressOutOfRange,
}, { // 5
net.ParseIP("2001:db8:1234:5678:9906::"), 53,
net.ParseIP("2001:db8:1234:5678:1c06::"), nil,
net.ParseIP("2001:db8:1234:5679:1606::"), nil,
net.ParseIP("2001:db8:1234:5678:9905::"), nil,
net.ParseIP("2001:db8:1234:5678:9907::"), nil,
}, { // 6
net.ParseIP("2001:db8:1234:5678:9907::"), 53,
net.ParseIP("2001:db8:1234:5678:1c07::"), nil,
net.ParseIP("2001:db8:1234:5679:1607::"), nil,
net.ParseIP("2001:db8:1234:5678:9906::"), nil,
net.ParseIP("2001:db8:1234:5678:9a00::"), nil,
}, { // 7
net.ParseIP("2001:db8:1234:5678:9908::"), 53,
net.ParseIP(""), ErrAddressOutOfRange,
net.ParseIP("2001:db8:1234:5679:1700::"), nil,
net.ParseIP("2001:db8:1234:5678:9907::"), nil,
net.ParseIP("2001:db8:1234:5678:9909::"), nil,
}, { // 8
net.ParseIP("2001:db8:1234:5678:ff::"), 56,
net.ParseIP(""), ErrAddressOutOfRange,
net.ParseIP("2001:db8:1234:567c:e700::"), nil,
net.ParseIP(""), ErrAddressOutOfRange,
net.ParseIP(""), ErrAddressOutOfRange,
},
}
func TestDecrementIP6WithinHostmask(t *testing.T) {
for i, tt := range IPHostmaskDeltaTests {
count := uint128.From64(1000)
hm := NewHostMask(tt.hostmask)
decr, err := DecrementIP6WithinHostmask(tt.ipaddr, hm, count)
if e := compareErrors(err, tt.decrErr); len(e) > 0 {
t.Errorf("[%d] %s (%s)", i, e, decr)
} else {
x := CompareIPs(decr, tt.decr)
if x != 0 {
t.Errorf("[%d] expected %s got %s", i, tt.decr, decr)
}
}
}
}
func TestIncrementIP6WithinHostmask(t *testing.T) {
for i, tt := range IPHostmaskDeltaTests {
count := uint128.From64(1000)
hm := NewHostMask(tt.hostmask)
incr, err := IncrementIP6WithinHostmask(tt.ipaddr, hm, count)
if e := compareErrors(err, tt.incrErr); len(e) > 0 {
t.Errorf("[%d] %s (%s)", i, e, incr)
} else {
x := CompareIPs(incr, tt.incr)
if x != 0 {
t.Errorf("[%d] expected %s got %s", i, tt.incr, incr)
}
}
}
}
func TestNextIPWithinHostmask(t *testing.T) {
for i, tt := range IPHostmaskDeltaTests {
next, err := NextIP6WithinHostmask(tt.ipaddr, NewHostMask(tt.hostmask))
if e := compareErrors(err, tt.nextErr); len(e) > 0 {
t.Errorf("[%d] %s (%s)", i, e, next)
} else {
x := CompareIPs(next, tt.next)
if x != 0 {
t.Errorf("[%d] expected %s got %s", i, tt.next, next)
}
}
}
}
func TestPreviousIPWithinHostmask(t *testing.T) {
for i, tt := range IPHostmaskDeltaTests {
prev, err := PreviousIP6WithinHostmask(tt.ipaddr, NewHostMask(tt.hostmask))
if e := compareErrors(err, tt.prevErr); len(e) > 0 {
t.Errorf("[%d] %s (%s)", i, e, prev)
} else {
x := CompareIPs(prev, tt.prev)
if x != 0 {
t.Errorf("[%d] expected %s got %s", i, tt.prev, prev)
}
}
}
}
func compareErrors(got, want error) string {
if got == nil && want == nil {
return ""
}
if got == nil && want != nil {
return "wanted error, but got none"
}
if got != nil && want == nil {
return "got unexpected error: " + got.Error()
}
if got.Error() != want.Error() {
return "got wrong error: " + got.Error()
}
return ""
}