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|
package testutil
import (
"fmt"
"io"
"net"
"sync"
"testing"
"golang.org/x/crypto/ssh"
)
// MockSSHServer provides a mock SSH server for testing.
type MockSSHServer struct {
t *testing.T
listener net.Listener
config *ssh.ServerConfig
handlers map[string]ChannelHandler
mu sync.Mutex
running bool
stopCh chan struct{}
connections []ssh.Conn
}
// ChannelHandler handles a specific channel type.
type ChannelHandler func(channel ssh.Channel, requests <-chan *ssh.Request)
// NewMockSSHServer creates a new mock SSH server.
func NewMockSSHServer(t *testing.T) *MockSSHServer {
privateKey := generateTestPrivateKey(t)
config := &ssh.ServerConfig{
NoClientAuth: true,
}
config.AddHostKey(privateKey)
return &MockSSHServer{
t: t,
config: config,
handlers: make(map[string]ChannelHandler),
stopCh: make(chan struct{}),
}
}
// AddHandler adds a channel handler for a specific channel type.
func (s *MockSSHServer) AddHandler(channelType string, handler ChannelHandler) {
s.mu.Lock()
defer s.mu.Unlock()
s.handlers[channelType] = handler
}
// Start starts the mock SSH server.
func (s *MockSSHServer) Start() (string, error) {
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return "", err
}
s.listener = listener
s.running = true
go s.acceptConnections()
return listener.Addr().String(), nil
}
// Stop stops the mock SSH server.
func (s *MockSSHServer) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if !s.running {
return
}
s.running = false
close(s.stopCh)
if s.listener != nil {
s.listener.Close()
}
for _, conn := range s.connections {
conn.Close()
}
}
func (s *MockSSHServer) acceptConnections() {
for {
select {
case <-s.stopCh:
return
default:
}
conn, err := s.listener.Accept()
if err != nil {
if !s.running {
return
}
s.t.Logf("error accepting connection: %v", err)
continue
}
go s.handleConnection(conn)
}
}
func (s *MockSSHServer) handleConnection(netConn net.Conn) {
sshConn, chans, reqs, err := ssh.NewServerConn(netConn, s.config)
if err != nil {
s.t.Logf("error creating SSH connection: %v", err)
netConn.Close()
return
}
s.mu.Lock()
s.connections = append(s.connections, sshConn)
s.mu.Unlock()
go ssh.DiscardRequests(reqs)
for newChannel := range chans {
s.mu.Lock()
handler, ok := s.handlers[newChannel.ChannelType()]
s.mu.Unlock()
if !ok {
newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
continue
}
channel, requests, err := newChannel.Accept()
if err != nil {
s.t.Logf("error accepting channel: %v", err)
continue
}
go handler(channel, requests)
}
}
// generateTestPrivateKey generates a test RSA private key.
func generateTestPrivateKey(t *testing.T) ssh.Signer {
// This is a test key - DO NOT use in production!
testKey := []byte(`-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----`)
signer, err := ssh.ParsePrivateKey(testKey)
if err != nil {
t.Fatalf("failed to parse test private key: %v", err)
}
return signer
}
// DefaultSessionHandler provides a default session handler that executes commands.
func DefaultSessionHandler() ChannelHandler {
return func(channel ssh.Channel, requests <-chan *ssh.Request) {
defer channel.Close()
for req := range requests {
switch req.Type {
case "exec":
// Simple echo implementation for testing
cmd := string(req.Payload[4:]) // Skip the length prefix
response := fmt.Sprintf("mock response for: %s\n", cmd)
channel.Write([]byte(response))
if req.WantReply {
req.Reply(true, nil)
}
// Send exit status
exitStatus := []byte{0, 0, 0, 0} // Success
channel.SendRequest("exit-status", false, exitStatus)
return
case "shell":
if req.WantReply {
req.Reply(true, nil)
}
// Simple shell that echoes input
go func() {
buf := make([]byte, 1024)
for {
n, err := channel.Read(buf)
if err != nil {
return
}
channel.Write(buf[:n])
}
}()
default:
if req.WantReply {
req.Reply(false, nil)
}
}
}
}
}
// EchoHandler returns a handler that echoes all input.
func EchoHandler() ChannelHandler {
return func(channel ssh.Channel, requests <-chan *ssh.Request) {
defer channel.Close()
go io.Copy(channel, channel)
ssh.DiscardRequests(requests)
}
}
|
