terraform/helper/ssh/communicator_test.go

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// +build !race
package ssh
import (
"bytes"
"fmt"
"net"
"testing"
"golang.org/x/crypto/ssh"
)
// private key for mock server
const testServerPrivateKey = `-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----`
var serverConfig = &ssh.ServerConfig{
PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
if c.User() == "user" && string(pass) == "pass" {
return nil, nil
}
return nil, fmt.Errorf("password rejected for %q", c.User())
},
}
func init() {
// Parse and set the private key of the server, required to accept connections
signer, err := ssh.ParsePrivateKey([]byte(testServerPrivateKey))
if err != nil {
panic("unable to parse private key: " + err.Error())
}
serverConfig.AddHostKey(signer)
}
func newMockLineServer(t *testing.T) string {
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("Unable to listen for connection: %s", err)
}
go func() {
defer l.Close()
c, err := l.Accept()
if err != nil {
t.Errorf("Unable to accept incoming connection: %s", err)
}
defer c.Close()
conn, chans, _, err := ssh.NewServerConn(c, serverConfig)
if err != nil {
t.Logf("Handshaking error: %v", err)
}
t.Log("Accepted SSH connection")
for newChannel := range chans {
channel, requests, err := newChannel.Accept()
if err != nil {
t.Errorf("Unable to accept channel.")
}
t.Log("Accepted channel")
go func(in <-chan *ssh.Request) {
for req := range in {
if req.WantReply {
req.Reply(true, nil)
}
}
}(requests)
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go func(newChannel ssh.NewChannel) {
conn.OpenChannel(newChannel.ChannelType(), nil)
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}(newChannel)
defer channel.Close()
}
conn.Close()
}()
return l.Addr().String()
}
func TestNew_Invalid(t *testing.T) {
clientConfig := &ssh.ClientConfig{
User: "user",
Auth: []ssh.AuthMethod{
ssh.Password("i-am-invalid"),
},
}
address := newMockLineServer(t)
conn := func() (net.Conn, error) {
conn, err := net.Dial("tcp", address)
if err != nil {
t.Errorf("Unable to accept incoming connection: %v", err)
}
return conn, err
}
config := &Config{
Connection: conn,
SSHConfig: clientConfig,
}
_, err := New(address, config)
if err == nil {
t.Fatal("should have had an error connecting")
}
}
func TestStart(t *testing.T) {
clientConfig := &ssh.ClientConfig{
User: "user",
Auth: []ssh.AuthMethod{
ssh.Password("pass"),
},
}
address := newMockLineServer(t)
conn := func() (net.Conn, error) {
conn, err := net.Dial("tcp", address)
if err != nil {
t.Fatalf("unable to dial to remote side: %s", err)
}
return conn, err
}
config := &Config{
Connection: conn,
SSHConfig: clientConfig,
}
client, err := New(address, config)
if err != nil {
t.Fatalf("error connecting to SSH: %s", err)
}
var cmd RemoteCmd
stdout := new(bytes.Buffer)
cmd.Command = "echo foo"
cmd.Stdout = stdout
err = client.Start(&cmd)
if err != nil {
t.Fatalf("error executing command: %s", err)
}
}