// +build linux

/*
Copyright 2017 The Kubernetes 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 ipvs

import (
	"net"
	"reflect"
	"syscall"
	"testing"

	"k8s.io/apimachinery/pkg/util/sets"
	"k8s.io/utils/exec"
	fakeexec "k8s.io/utils/exec/testing"

	"github.com/docker/libnetwork/ipvs"
)

const dummyDevice = "kube-ipvs0"

func TestEnsureVirtualServerAddressBind(t *testing.T) {
	vs := &VirtualServer{
		Address:  net.ParseIP("10.20.30.40"),
		Port:     uint16(1234),
		Protocol: string("TCP"),
	}
	fcmd := fakeexec.FakeCmd{
		CombinedOutputScript: []fakeexec.FakeCombinedOutputAction{
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
			// Exists.
			func() ([]byte, error) { return nil, &fakeexec.FakeExitError{Status: 2} },
		},
	}
	fexec := fakeexec.FakeExec{
		CommandScript: []fakeexec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return fakeexec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return fakeexec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec)
	// Success.
	exists, err := runner.EnsureVirtualServerAddressBind(vs, dummyDevice)
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if exists {
		t.Errorf("expected exists = false")
	}
	if fcmd.CombinedOutputCalls != 1 {
		t.Errorf("expected 1 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[0]...).HasAll("ip", "addr", "add", "10.20.30.40/32", "dev", "kube-ipvs0") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[0])
	}
	// Exists.
	exists, err = runner.EnsureVirtualServerAddressBind(vs, dummyDevice)
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if !exists {
		t.Errorf("expected exists = true")
	}
}

func TestUnbindVirtualServerAddress(t *testing.T) {
	svc := &VirtualServer{
		Address:  net.ParseIP("10.20.30.41"),
		Port:     uint16(80),
		Protocol: string("TCP"),
	}
	fcmd := fakeexec.FakeCmd{
		CombinedOutputScript: []fakeexec.FakeCombinedOutputAction{
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
			// Failure.
			func() ([]byte, error) { return nil, &fakeexec.FakeExitError{Status: 2} },
		},
	}
	fexec := fakeexec.FakeExec{
		CommandScript: []fakeexec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return fakeexec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return fakeexec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec)
	// Success.
	err := runner.UnbindVirtualServerAddress(svc, dummyDevice)
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 1 {
		t.Errorf("expected 1 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[0]...).HasAll("ip", "addr", "del", "10.20.30.41/32", "dev", "kube-ipvs0") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[0])
	}
	// Failure.
	err = runner.UnbindVirtualServerAddress(svc, dummyDevice)
	if err == nil {
		t.Errorf("expected failure")
	}
}

func Test_toFrontendService(t *testing.T) {
	Tests := []struct {
		ipvsService   ipvs.Service
		virtualServer VirtualServer
	}{
		{
			ipvs.Service{
				Protocol:      syscall.IPPROTO_TCP,
				Port:          80,
				FWMark:        0,
				SchedName:     "",
				Flags:         0,
				Timeout:       0,
				Netmask:       0xffffffff,
				AddressFamily: syscall.AF_INET,
				Address:       nil,
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("0.0.0.0"),
				Protocol:  "TCP",
				Port:      80,
				Scheduler: "",
				Flags:     0,
				Timeout:   0,
			},
		},
		{
			ipvs.Service{
				Protocol:      syscall.IPPROTO_UDP,
				Port:          33434,
				FWMark:        0,
				SchedName:     "wlc",
				Flags:         1234,
				Timeout:       100,
				Netmask:       128,
				AddressFamily: syscall.AF_INET6,
				Address:       net.ParseIP("2012::beef"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("2012::beef"),
				Protocol:  "UDP",
				Port:      33434,
				Scheduler: "wlc",
				Flags:     1234,
				Timeout:   100,
			},
		},
		{
			ipvs.Service{
				Protocol:      0,
				Port:          0,
				FWMark:        0,
				SchedName:     "lc",
				Flags:         0,
				Timeout:       0,
				Netmask:       0xffffffff,
				AddressFamily: syscall.AF_INET,
				Address:       net.ParseIP("1.2.3.4"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("1.2.3.4"),
				Protocol:  "",
				Port:      0,
				Scheduler: "lc",
				Flags:     0,
				Timeout:   0,
			},
		},
		{
			ipvs.Service{
				Protocol:      0,
				Port:          0,
				FWMark:        0,
				SchedName:     "wrr",
				Flags:         0,
				Timeout:       0,
				Netmask:       128,
				AddressFamily: syscall.AF_INET6,
				Address:       nil,
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("::0"),
				Protocol:  "",
				Port:      0,
				Scheduler: "wrr",
				Flags:     0,
				Timeout:   0,
			},
		},
	}

	for i := range Tests {
		got, err := toVirtualServer(&Tests[i].ipvsService)
		if err != nil {
			t.Errorf("case: %d, unexpected error: %v", i, err)
		}
		if !reflect.DeepEqual(*got, Tests[i].virtualServer) {
			t.Errorf("case: %d, got %#v, want %#v", i, *got, Tests[i].virtualServer)
		}
	}
}

func Test_toBackendService(t *testing.T) {
	Tests := []struct {
		ipvsService   ipvs.Service
		virtualServer VirtualServer
	}{
		{
			ipvs.Service{
				Protocol:      syscall.IPPROTO_TCP,
				Port:          80,
				FWMark:        0,
				SchedName:     "",
				Flags:         0,
				Timeout:       0,
				Netmask:       0xffffffff,
				AddressFamily: syscall.AF_INET,
				Address:       net.ParseIP("0.0.0.0"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("0.0.0.0"),
				Protocol:  "TCP",
				Port:      80,
				Scheduler: "",
				Flags:     0,
				Timeout:   0,
			},
		},
		{
			ipvs.Service{
				Protocol:      syscall.IPPROTO_UDP,
				Port:          33434,
				FWMark:        0,
				SchedName:     "wlc",
				Flags:         1234,
				Timeout:       100,
				Netmask:       128,
				AddressFamily: syscall.AF_INET6,
				Address:       net.ParseIP("2012::beef"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("2012::beef"),
				Protocol:  "UDP",
				Port:      33434,
				Scheduler: "wlc",
				Flags:     1234,
				Timeout:   100,
			},
		},
		{
			ipvs.Service{
				Protocol:      0,
				Port:          0,
				FWMark:        0,
				SchedName:     "lc",
				Flags:         0,
				Timeout:       0,
				Netmask:       0xffffffff,
				AddressFamily: syscall.AF_INET,
				Address:       net.ParseIP("1.2.3.4"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("1.2.3.4"),
				Protocol:  "",
				Port:      0,
				Scheduler: "lc",
				Flags:     0,
				Timeout:   0,
			},
		},
		{
			ipvs.Service{
				Protocol:      0,
				Port:          0,
				FWMark:        0,
				SchedName:     "wrr",
				Flags:         0,
				Timeout:       0,
				Netmask:       128,
				AddressFamily: syscall.AF_INET6,
				Address:       net.ParseIP("::0"),
				PEName:        "",
			},
			VirtualServer{
				Address:   net.ParseIP("::0"),
				Protocol:  "",
				Port:      0,
				Scheduler: "wrr",
				Flags:     0,
				Timeout:   0,
			},
		},
	}

	for i := range Tests {
		got, err := toBackendService(&Tests[i].virtualServer)
		if err != nil {
			t.Errorf("case: %d, unexpected error: %v", i, err)
		}
		if !reflect.DeepEqual(*got, Tests[i].ipvsService) {
			t.Errorf("case: %d - got %#v, want %#v", i, *got, Tests[i].ipvsService)
		}
	}
}

func Test_toFrontendDestination(t *testing.T) {
	Tests := []struct {
		ipvsDestination ipvs.Destination
		realServer      RealServer
	}{
		{
			ipvs.Destination{
				Port:            54321,
				ConnectionFlags: 0,
				Weight:          1,
				Address:         net.ParseIP("1.2.3.4"),
			},
			RealServer{
				Address: net.ParseIP("1.2.3.4"),
				Port:    54321,
				Weight:  1,
			},
		},
		{
			ipvs.Destination{
				Port:            53,
				ConnectionFlags: 0,
				Weight:          1,
				Address:         net.ParseIP("2002::cafe"),
			},
			RealServer{
				Address: net.ParseIP("2002::cafe"),
				Port:    53,
				Weight:  1,
			},
		},
	}
	for i := range Tests {
		got, err := toRealServer(&Tests[i].ipvsDestination)
		if err != nil {
			t.Errorf("case %d unexpected error: %d", i, err)
		}
		if !reflect.DeepEqual(*got, Tests[i].realServer) {
			t.Errorf("case %d Failed to translate Destination - got %#v, want %#v", i, *got, Tests[i].realServer)
		}
	}
}

func Test_toBackendDestination(t *testing.T) {
	Tests := []struct {
		realServer      RealServer
		ipvsDestination ipvs.Destination
	}{
		{
			RealServer{
				Address: net.ParseIP("1.2.3.4"),
				Port:    54321,
				Weight:  1,
			},
			ipvs.Destination{
				Port:            54321,
				ConnectionFlags: 0,
				Weight:          1,
				Address:         net.ParseIP("1.2.3.4"),
			},
		},
		{
			RealServer{
				Address: net.ParseIP("2002::cafe"),
				Port:    53,
				Weight:  1,
			},
			ipvs.Destination{
				Port:            53,
				ConnectionFlags: 0,
				Weight:          1,
				Address:         net.ParseIP("2002::cafe"),
			},
		},
	}
	for i := range Tests {
		got, err := toBackendDestination(&Tests[i].realServer)
		if err != nil {
			t.Errorf("case %d unexpected error: %d", i, err)
		}
		if !reflect.DeepEqual(*got, Tests[i].ipvsDestination) {
			t.Errorf("case %d Failed to translate Destination - got %#v, want %#v", i, *got, Tests[i].ipvsDestination)
		}
	}
}

func Test_stringToProtocolNumber(t *testing.T) {
	tests := []string{
		"TCP", "UDP", "ICMP",
	}
	expecteds := []uint16{
		uint16(syscall.IPPROTO_TCP), uint16(syscall.IPPROTO_UDP), uint16(0),
	}
	for i := range tests {
		got := stringToProtocolNumber(tests[i])
		if got != expecteds[i] {
			t.Errorf("stringToProtocolNumber() failed - got %#v, want %#v",
				got, expecteds[i])
		}
	}
}

func Test_protocolNumberToString(t *testing.T) {
	tests := []ProtoType{
		syscall.IPPROTO_TCP, syscall.IPPROTO_UDP, ProtoType(0),
	}
	expecteds := []string{
		"TCP", "UDP", "",
	}
	for i := range tests {
		got := protocolNumbeToString(tests[i])
		if got != expecteds[i] {
			t.Errorf("protocolNumbeToString() failed - got %#v, want %#v",
				got, expecteds[i])
		}
	}
}