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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proc
import (
"testing"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/inet"
"gvisor.dev/gvisor/pkg/usermem"
)
func TestQuerySendBufferSize(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
s.TCPSendBufSize = inet.TCPBufferSize{100, 200, 300}
tmi := &tcpMemInode{s: s, dir: tcpWMem}
tmf := &tcpMemFile{tcpMemInode: tmi}
buf := make([]byte, 100)
dst := usermem.BytesIOSequence(buf)
n, err := tmf.Read(ctx, nil, dst, 0)
if err != nil {
t.Fatalf("Read failed: %v", err)
}
if got, want := string(buf[:n]), "100\t200\t300\n"; got != want {
t.Fatalf("Bad string: got %v, want %v", got, want)
}
}
func TestQueryRecvBufferSize(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
s.TCPRecvBufSize = inet.TCPBufferSize{100, 200, 300}
tmi := &tcpMemInode{s: s, dir: tcpRMem}
tmf := &tcpMemFile{tcpMemInode: tmi}
buf := make([]byte, 100)
dst := usermem.BytesIOSequence(buf)
n, err := tmf.Read(ctx, nil, dst, 0)
if err != nil {
t.Fatalf("Read failed: %v", err)
}
if got, want := string(buf[:n]), "100\t200\t300\n"; got != want {
t.Fatalf("Bad string: got %v, want %v", got, want)
}
}
var cases = []struct {
str string
initial inet.TCPBufferSize
final inet.TCPBufferSize
}{
{
str: "",
initial: inet.TCPBufferSize{1, 2, 3},
final: inet.TCPBufferSize{1, 2, 3},
},
{
str: "100\n",
initial: inet.TCPBufferSize{1, 100, 200},
final: inet.TCPBufferSize{100, 100, 200},
},
{
str: "100 200 300\n",
initial: inet.TCPBufferSize{1, 2, 3},
final: inet.TCPBufferSize{100, 200, 300},
},
}
func TestConfigureSendBufferSize(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
for _, c := range cases {
s.TCPSendBufSize = c.initial
tmi := &tcpMemInode{s: s, dir: tcpWMem}
tmf := &tcpMemFile{tcpMemInode: tmi}
// Write the values.
src := usermem.BytesIOSequence([]byte(c.str))
if n, err := tmf.Write(ctx, nil, src, 0); n != int64(len(c.str)) || err != nil {
t.Errorf("Write, case = %q: got (%d, %v), wanted (%d, nil)", c.str, n, err, len(c.str))
}
// Read the values from the stack and check them.
if s.TCPSendBufSize != c.final {
t.Errorf("TCPSendBufferSize, case = %q: got %v, wanted %v", c.str, s.TCPSendBufSize, c.final)
}
}
}
func TestConfigureRecvBufferSize(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
for _, c := range cases {
s.TCPRecvBufSize = c.initial
tmi := &tcpMemInode{s: s, dir: tcpRMem}
tmf := &tcpMemFile{tcpMemInode: tmi}
// Write the values.
src := usermem.BytesIOSequence([]byte(c.str))
if n, err := tmf.Write(ctx, nil, src, 0); n != int64(len(c.str)) || err != nil {
t.Errorf("Write, case = %q: got (%d, %v), wanted (%d, nil)", c.str, n, err, len(c.str))
}
// Read the values from the stack and check them.
if s.TCPRecvBufSize != c.final {
t.Errorf("TCPRecvBufferSize, case = %q: got %v, wanted %v", c.str, s.TCPRecvBufSize, c.final)
}
}
}
// TestIPForwarding tests the implementation of
// /proc/sys/net/ipv4/ip_forwarding
func TestIPForwarding(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
var cases = []struct {
comment string
initial bool
str string
final bool
}{
{
comment: `Forwarding is disabled; write 1 and enable forwarding`,
initial: false,
str: "1",
final: true,
},
{
comment: `Forwarding is disabled; write 0 and disable forwarding`,
initial: false,
str: "0",
final: false,
},
{
comment: `Forwarding is enabled; write 1 and enable forwarding`,
initial: true,
str: "1",
final: true,
},
{
comment: `Forwarding is enabled; write 0 and disable forwarding`,
initial: true,
str: "0",
final: false,
},
{
comment: `Forwarding is disabled; write 2404 and enable forwarding`,
initial: false,
str: "2404",
final: true,
},
{
comment: `Forwarding is enabled; write 2404 and enable forwarding`,
initial: true,
str: "2404",
final: true,
},
}
for _, c := range cases {
t.Run(c.comment, func(t *testing.T) {
s.IPForwarding = c.initial
ipf := &ipForwarding{stack: s}
file := &ipForwardingFile{
stack: s,
ipf: ipf,
}
// Write the values.
src := usermem.BytesIOSequence([]byte(c.str))
if n, err := file.Write(ctx, nil, src, 0); n != int64(len(c.str)) || err != nil {
t.Errorf("file.Write(ctx, nil, %q, 0) = (%d, %v); want (%d, nil)", c.str, n, err, len(c.str))
}
// Read the values from the stack and check them.
if got, want := s.IPForwarding, c.final; got != want {
t.Errorf("s.IPForwarding incorrect; got: %v, want: %v", got, want)
}
})
}
}
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