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// Copyright 2018 Google Inc.
//
// 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 ports
import (
"testing"
"gvisor.googlesource.com/gvisor/pkg/tcpip"
)
const (
fakeTransNumber tcpip.TransportProtocolNumber = 1
fakeNetworkNumber tcpip.NetworkProtocolNumber = 2
fakeIPAddress = tcpip.Address("\x08\x08\x08\x08")
fakeIPAddress1 = tcpip.Address("\x08\x08\x08\x09")
)
func TestPortReservation(t *testing.T) {
pm := NewPortManager()
net := []tcpip.NetworkProtocolNumber{fakeNetworkNumber}
for _, test := range []struct {
port uint16
ip tcpip.Address
want *tcpip.Error
}{
{
port: 80,
ip: fakeIPAddress,
want: nil,
},
{
port: 80,
ip: fakeIPAddress1,
want: nil,
},
{
/* N.B. Order of tests matters! */
port: 80,
ip: anyIPAddress,
want: tcpip.ErrPortInUse,
},
{
port: 22,
ip: anyIPAddress,
want: nil,
},
{
port: 22,
ip: fakeIPAddress,
want: tcpip.ErrPortInUse,
},
{
port: 0,
ip: fakeIPAddress,
want: nil,
},
{
port: 0,
ip: fakeIPAddress,
want: nil,
},
} {
gotPort, err := pm.ReservePort(net, fakeTransNumber, test.ip, test.port)
if err != test.want {
t.Fatalf("ReservePort(.., .., %s, %d) = %v, want %v", test.ip, test.port, err, test.want)
}
if test.port == 0 && (gotPort == 0 || gotPort < firstEphemeral) {
t.Fatalf("ReservePort(.., .., .., 0) = %d, want port number >= %d to be picked", gotPort, firstEphemeral)
}
}
// Release port 22 from any IP address, then try to reserve fake IP
// address on 22.
pm.ReleasePort(net, fakeTransNumber, anyIPAddress, 22)
if port, err := pm.ReservePort(net, fakeTransNumber, fakeIPAddress, 22); port != 22 || err != nil {
t.Fatalf("ReservePort(.., .., .., %d) = (port %d, err %v), want (22, nil); failed to reserve port after it should have been released", 22, port, err)
}
}
func TestPickEphemeralPort(t *testing.T) {
pm := NewPortManager()
customErr := &tcpip.Error{}
for _, test := range []struct {
name string
f func(port uint16) (bool, *tcpip.Error)
wantErr *tcpip.Error
wantPort uint16
}{
{
name: "no-port-available",
f: func(port uint16) (bool, *tcpip.Error) {
return false, nil
},
wantErr: tcpip.ErrNoPortAvailable,
},
{
name: "port-tester-error",
f: func(port uint16) (bool, *tcpip.Error) {
return false, customErr
},
wantErr: customErr,
},
{
name: "only-port-16042-available",
f: func(port uint16) (bool, *tcpip.Error) {
if port == firstEphemeral+42 {
return true, nil
}
return false, nil
},
wantPort: firstEphemeral + 42,
},
{
name: "only-port-under-16000-available",
f: func(port uint16) (bool, *tcpip.Error) {
if port < firstEphemeral {
return true, nil
}
return false, nil
},
wantErr: tcpip.ErrNoPortAvailable,
},
} {
t.Run(test.name, func(t *testing.T) {
if port, err := pm.PickEphemeralPort(test.f); port != test.wantPort || err != test.wantErr {
t.Errorf("PickEphemeralPort(..) = (port %d, err %v); want (port %d, err %v)", port, err, test.wantPort, test.wantErr)
}
})
}
}
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