mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Kevin KrakauerandgVisor bot
ef88b30bff
The important change here is in tcpip/tcpip.go, where tcpip.Address is defined. The rest is updating uses of tcpip.Address. This is preparation for netip.Addr or []byte based addresses, which should save us a bunch of allocations. Currently, we allocate every time we want to, say, get a tcpip.Address from a header. This is because the header is a byte slice, but Address is a string. Strings are immutable, so Go allocates and copies. PiperOrigin-RevId: 532284732
348 lines
8.9 KiB
Go
348 lines
8.9 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcpip
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"testing"
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"github.com/google/go-cmp/cmp"
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)
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func TestLimitedWriter_Write(t *testing.T) {
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var b bytes.Buffer
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l := LimitedWriter{
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W: &b,
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N: 5,
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}
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if n, err := l.Write([]byte{0, 1, 2}); err != nil {
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t.Errorf("got l.Write(3/5) = (_, %s), want nil", err)
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} else if n != 3 {
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t.Errorf("got l.Write(3/5) = (%d, _), want 3", n)
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}
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if n, err := l.Write([]byte{3, 4, 5}); err != io.ErrShortWrite {
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t.Errorf("got l.Write(3/2) = (_, %s), want io.ErrShortWrite", err)
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} else if n != 2 {
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t.Errorf("got l.Write(3/2) = (%d, _), want 2", n)
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}
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if l.N != 0 {
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t.Errorf("got l.N = %d, want 0", l.N)
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}
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l.N = 1
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if n, err := l.Write([]byte{5}); err != nil {
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t.Errorf("got l.Write(1/1) = (_, %s), want nil", err)
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} else if n != 1 {
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t.Errorf("got l.Write(1/1) = (%d, _), want 1", n)
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}
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if diff := cmp.Diff(b.Bytes(), []byte{0, 1, 2, 3, 4, 5}); diff != "" {
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t.Errorf("%T wrote incorrect data: (-want +got):\n%s", l, diff)
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}
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}
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func TestSubnetContains(t *testing.T) {
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tests := []struct {
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s string
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m string
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a string
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want bool
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}{
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{"\xa0", "\xf0", "\x90", false},
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{"\xa0", "\xf0", "\xa0", true},
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{"\xa0", "\xf0", "\xa5", true},
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{"\xa0", "\xf0", "\xaf", true},
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{"\xa0", "\xf0", "\xb0", false},
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{"\xa0", "\xf0", "", false},
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{"\xc2\x80", "\xff\xf0", "\xc2\x80", true},
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{"\xc2\x80", "\xff\xf0", "\xc2\x00", false},
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{"\xc2\x00", "\xff\xf0", "\xc2\x00", true},
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{"\xc2\x00", "\xff\xf0", "\xc2\x80", false},
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}
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for _, tt := range tests {
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s, err := NewSubnet(AddrFromSlice(padTo4(tt.s)), MaskFromBytes(padTo4(tt.m)))
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if err != nil {
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t.Errorf("NewSubnet(%v, %v) = %v", tt.s, tt.m, err)
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continue
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}
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if got := s.Contains(AddrFromSlice(padTo4(tt.a))); got != tt.want {
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t.Errorf("Subnet(%v).Contains(%v) = %v, want %v", s, tt.a, got, tt.want)
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}
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}
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}
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func TestSubnetContainsDifferentLength(t *testing.T) {
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s, err := NewSubnet(AddrFromSlice([]byte("\xa0\x00\x00\x00")), MaskFromBytes([]byte("\xf0\x00\x00\x00")))
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if err != nil {
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t.Fatalf("NewSubnet(a0::, f0::) = %v", err)
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}
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if got := s.Contains(AddrFrom16Slice([]byte("\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"))); got != false {
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t.Fatalf("Subnet(%v).Contains(a0::) = %v, want %v", s, got, false)
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}
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}
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func TestSubnetBits(t *testing.T) {
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tests := []struct {
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a string
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want1 int
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want0 int
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}{
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{"\x00", 0, 32},
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{"\x36", 0, 32},
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{"\x5c", 0, 32},
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{"\x5c\x5c", 0, 32},
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{"\x5c\x36", 0, 32},
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{"\x36\x5c", 0, 32},
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{"\x36\x36", 0, 32},
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{"\xff", 8, 24},
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{"\xff\xff", 16, 16},
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}
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for _, tt := range tests {
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s := &Subnet{mask: MaskFromBytes(padTo4(tt.a))}
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got1, got0 := s.Bits()
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if got1 != tt.want1 || got0 != tt.want0 {
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t.Errorf("Subnet{mask: %x}.Bits() = %d, %d, want %d, %d", tt.a, got1, got0, tt.want1, tt.want0)
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}
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}
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}
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func TestSubnetPrefix(t *testing.T) {
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tests := []struct {
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a string
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want int
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}{
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{"\x00", 0},
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{"\x00\x00", 0},
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{"\x36", 0},
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{"\x86", 1},
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{"\xc5", 2},
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{"\xff\x00", 8},
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{"\xff\x36", 8},
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{"\xff\x8c", 9},
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{"\xff\xc8", 10},
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{"\xff", 8},
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{"\xff\xff", 16},
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}
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for _, tt := range tests {
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s := &Subnet{mask: MaskFromBytes(padTo4(tt.a))}
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got := s.Prefix()
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if got != tt.want {
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t.Errorf("Subnet{mask: %x}.Bits() = %d want %d", tt.a, got, tt.want)
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}
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}
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}
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func TestSubnetCreation(t *testing.T) {
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tests := []struct {
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a string
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m string
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want error
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}{
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{"\xa0", "\xf0", nil},
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{"\xaa", "\xf0", errSubnetAddressMasked},
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{"", "", nil},
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}
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for _, tt := range tests {
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if _, err := NewSubnet(AddrFromSlice(padTo4(tt.a)), MaskFromBytes(padTo4(tt.m))); err != tt.want {
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t.Errorf("NewSubnet(%v, %v) = %v, want %v", tt.a, tt.m, err, tt.want)
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}
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}
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}
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func TestSubnetCreationDifferentLength(t *testing.T) {
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addr := []byte("\xa0\xa0\x00\x00")
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mask := []byte("\xf0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
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if _, err := NewSubnet(AddrFromSlice(addr), MaskFromBytes(mask)); err != errSubnetLengthMismatch {
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t.Errorf("NewSubnet(%v, %v) = %v, want %v", addr, mask, err, errSubnetLengthMismatch)
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}
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}
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func TestAddressString(t *testing.T) {
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for _, want := range []string{
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// Taken from stdlib.
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"2001:db8::123:12:1",
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"2001:db8::1",
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"2001:db8:0:1:0:1:0:1",
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"2001:db8:1:0:1:0:1:0",
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"2001::1:0:0:1",
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"2001:db8:0:0:1::",
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"2001:db8::1:0:0:1",
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"2001:db8::a:b:c:d",
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// Leading zeros.
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"::1",
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// Trailing zeros.
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"8::",
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// No zeros.
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"1:1:1:1:1:1:1:1",
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// Longer sequence is after other zeros, but not at the end.
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"1:0:0:1::1",
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// Longer sequence is at the beginning, shorter sequence is at
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// the end.
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"::1:1:1:0:0",
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// Longer sequence is not at the beginning, shorter sequence is
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// at the end.
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"1::1:1:0:0",
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// Longer sequence is at the beginning, shorter sequence is not
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// at the end.
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"::1:1:0:0:1",
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// Neither sequence is at an end, longer is after shorter.
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"1:0:0:1::1",
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// Shorter sequence is at the beginning, longer sequence is not
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// at the end.
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"0:0:1:1::1",
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// Shorter sequence is at the beginning, longer sequence is at
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// the end.
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"0:0:1:1:1::",
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// Short sequences at both ends, longer one in the middle.
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"0:1:1::1:1:0",
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// Short sequences at both ends, longer one in the middle.
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"0:1::1:0:0",
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// Short sequences at both ends, longer one in the middle.
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"0:0:1::1:0",
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// Longer sequence surrounded by shorter sequences, but none at
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// the end.
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"1:0:1::1:0:1",
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} {
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addr := AddrFromSlice(net.ParseIP(want))
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if got := addr.String(); got != want {
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t.Errorf("Address(%x).String() = '%s', want = '%s'", addr, got, want)
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}
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}
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}
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func TestAddressWithPrefixSubnet(t *testing.T) {
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tests := []struct {
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addr string
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prefixLen int
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subnetAddr string
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subnetMask string
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}{
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{"\xaa\x55\x33\x42", -1, "\x00\x00\x00\x00", "\x00\x00\x00\x00"},
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{"\xaa\x55\x33\x42", 0, "\x00\x00\x00\x00", "\x00\x00\x00\x00"},
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{"\xaa\x55\x33\x42", 1, "\x80\x00\x00\x00", "\x80\x00\x00\x00"},
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{"\xaa\x55\x33\x42", 7, "\xaa\x00\x00\x00", "\xfe\x00\x00\x00"},
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{"\xaa\x55\x33\x42", 8, "\xaa\x00\x00\x00", "\xff\x00\x00\x00"},
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{"\xaa\x55\x33\x42", 24, "\xaa\x55\x33\x00", "\xff\xff\xff\x00"},
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{"\xaa\x55\x33\x42", 31, "\xaa\x55\x33\x42", "\xff\xff\xff\xfe"},
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{"\xaa\x55\x33\x42", 32, "\xaa\x55\x33\x42", "\xff\xff\xff\xff"},
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{"\xaa\x55\x33\x42", 33, "\xaa\x55\x33\x42", "\xff\xff\xff\xff"},
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}
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for _, tt := range tests {
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ap := AddressWithPrefix{Address: AddrFromSlice([]byte(tt.addr)), PrefixLen: tt.prefixLen}
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gotSubnet := ap.Subnet()
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wantSubnet, err := NewSubnet(AddrFromSlice([]byte(tt.subnetAddr)), MaskFromBytes([]byte(tt.subnetMask)))
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if err != nil {
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t.Errorf("NewSubnet(%q, %q) failed: %s", tt.subnetAddr, tt.subnetMask, err)
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continue
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}
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if gotSubnet != wantSubnet {
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t.Errorf("got subnet = %q, want = %q", gotSubnet, wantSubnet)
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}
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}
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}
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func TestAddressUnspecified(t *testing.T) {
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tests := []struct {
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addr string
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unspecified bool
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}{
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{
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addr: "",
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unspecified: true,
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},
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{
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addr: "\x00",
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unspecified: true,
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},
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{
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addr: "\x01",
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unspecified: false,
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},
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{
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addr: "\x00\x00",
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unspecified: true,
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},
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{
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addr: "\x01\x00",
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unspecified: false,
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},
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{
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addr: "\x00\x01",
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unspecified: false,
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},
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{
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addr: "\x01\x01",
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unspecified: false,
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},
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}
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for _, test := range tests {
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t.Run(fmt.Sprintf("addr=%s", test.addr), func(t *testing.T) {
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if got := AddrFromSlice(padTo4(test.addr)).Unspecified(); got != test.unspecified {
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t.Fatalf("got addr.Unspecified() = %t, want = %t", got, test.unspecified)
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}
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})
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}
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}
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func TestAddressMatchingPrefix(t *testing.T) {
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tests := []struct {
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addrA string
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addrB string
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prefix uint8
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}{
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{
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addrA: "\x01\x01",
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addrB: "\x01\x01",
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prefix: 32,
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},
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{
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addrA: "\x01\x01",
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addrB: "\x01\x00",
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prefix: 15,
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},
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{
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addrA: "\x01\x01",
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addrB: "\x81\x00",
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prefix: 0,
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},
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{
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addrA: "\x01\x01",
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addrB: "\x01\x80",
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prefix: 8,
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},
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{
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addrA: "\x01\x01",
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addrB: "\x02\x80",
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prefix: 6,
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},
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}
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for _, test := range tests {
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if got := AddrFromSlice(padTo4(test.addrA)).MatchingPrefix(AddrFromSlice(padTo4(test.addrB))); got != test.prefix {
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t.Errorf("got (%s).MatchingPrefix(%s) = %d, want = %d", test.addrA, test.addrB, got, test.prefix)
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}
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}
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}
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func padTo4(partial string) []byte {
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for len(partial) < 4 {
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partial += "\x00"
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}
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return []byte(partial)
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}
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