| // 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" |
| |
| "github.com/google/netstack/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) |
| } |
| }) |
| } |
| } |