1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// Copyright 2019 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 iptables
import (
"fmt"
"net"
"os"
"path"
"testing"
"time"
"flag"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/runsc/dockerutil"
"gvisor.dev/gvisor/runsc/testutil"
)
const timeout = 18 * time.Second
var image = flag.String("image", "bazel/test/iptables/runner:runner", "image to run tests in")
type result struct {
output string
err error
}
// singleTest runs a TestCase. Each test follows a pattern:
// - Create a container.
// - Get the container's IP.
// - Send the container our IP.
// - Start a new goroutine running the local action of the test.
// - Wait for both the container and local actions to finish.
//
// Container output is logged to $TEST_UNDECLARED_OUTPUTS_DIR if it exists, or
// to stderr.
func singleTest(test TestCase) error {
if _, ok := Tests[test.Name()]; !ok {
return fmt.Errorf("no test found with name %q. Has it been registered?", test.Name())
}
// Create and start the container.
cont := dockerutil.MakeDocker("gvisor-iptables")
defer cont.CleanUp()
resultChan := make(chan *result)
go func() {
output, err := cont.RunFg("--cap-add=NET_ADMIN", *image, "-name", test.Name())
logContainer(output, err)
resultChan <- &result{output, err}
}()
// Get the container IP.
ip, err := getIP(cont)
if err != nil {
return fmt.Errorf("failed to get container IP: %v", err)
}
// Give the container our IP.
if err := sendIP(ip); err != nil {
return fmt.Errorf("failed to send IP to container: %v", err)
}
// Run our side of the test.
errChan := make(chan error)
go func() {
errChan <- test.LocalAction(ip)
}()
// Wait for both the container and local tests to finish.
var res *result
to := time.After(timeout)
for localDone := false; res == nil || !localDone; {
select {
case res = <-resultChan:
log.Infof("Container finished.")
case err, localDone = <-errChan:
log.Infof("Local finished.")
if err != nil {
return fmt.Errorf("local test failed: %v", err)
}
case <-to:
return fmt.Errorf("timed out after %f seconds", timeout.Seconds())
}
}
return res.err
}
func getIP(cont dockerutil.Docker) (net.IP, error) {
// The container might not have started yet, so retry a few times.
var ipStr string
to := time.After(timeout)
for ipStr == "" {
ipStr, _ = cont.FindIP()
select {
case <-to:
return net.IP{}, fmt.Errorf("timed out getting IP after %f seconds", timeout.Seconds())
default:
time.Sleep(250 * time.Millisecond)
}
}
ip := net.ParseIP(ipStr)
if ip == nil {
return net.IP{}, fmt.Errorf("invalid IP: %q", ipStr)
}
log.Infof("Container has IP of %s", ipStr)
return ip, nil
}
func sendIP(ip net.IP) error {
contAddr := net.TCPAddr{
IP: ip,
Port: IPExchangePort,
}
var conn *net.TCPConn
// The container may not be listening when we first connect, so retry
// upon error.
cb := func() error {
c, err := net.DialTCP("tcp4", nil, &contAddr)
conn = c
return err
}
if err := testutil.Poll(cb, timeout); err != nil {
return fmt.Errorf("timed out waiting to send IP, most recent error: %v", err)
}
if _, err := conn.Write([]byte{0}); err != nil {
return fmt.Errorf("error writing to container: %v", err)
}
return nil
}
func logContainer(output string, err error) {
msg := fmt.Sprintf("Container error: %v\nContainer output:\n%v", err, output)
if artifactsDir := os.Getenv("TEST_UNDECLARED_OUTPUTS_DIR"); artifactsDir != "" {
fpath := path.Join(artifactsDir, "container.log")
if file, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE, 0644); err != nil {
log.Warningf("Failed to open log file %q: %v", fpath, err)
} else {
defer file.Close()
if _, err := file.Write([]byte(msg)); err == nil {
return
}
log.Warningf("Failed to write to log file %s: %v", fpath, err)
}
}
// We couldn't write to the output directory -- just log to stderr.
log.Infof(msg)
}
func TestFilterInputDropUDP(t *testing.T) {
if err := singleTest(FilterInputDropUDP{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropUDPPort(t *testing.T) {
if err := singleTest(FilterInputDropUDPPort{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropDifferentUDPPort(t *testing.T) {
if err := singleTest(FilterInputDropDifferentUDPPort{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropAll(t *testing.T) {
if err := singleTest(FilterInputDropAll{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropOnlyUDP(t *testing.T) {
if err := singleTest(FilterInputDropOnlyUDP{}); err != nil {
t.Fatal(err)
}
}
func TestNATRedirectUDPPort(t *testing.T) {
if err := singleTest(NATRedirectUDPPort{}); err != nil {
t.Fatal(err)
}
}
func TestNATDropUDP(t *testing.T) {
if err := singleTest(NATDropUDP{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropTCPDestPort(t *testing.T) {
if err := singleTest(FilterInputDropTCPDestPort{}); err != nil {
t.Fatal(err)
}
}
func TestFilterInputDropTCPSrcPort(t *testing.T) {
if err := singleTest(FilterInputDropTCPSrcPort{}); err != nil {
t.Fatal(err)
}
}
func TestFilterOutputDropTCPDestPort(t *testing.T) {
if err := singleTest(FilterOutputDropTCPDestPort{}); err != nil {
t.Fatal(err)
}
}
func TestFilterOutputDropTCPSrcPort(t *testing.T) {
if err := singleTest(FilterOutputDropTCPSrcPort{}); err != nil {
t.Fatal(err)
}
}
|
