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communicator.go
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communicator.go
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package winrm
import (
"fmt"
"io"
"log"
"math/rand"
"strconv"
"strings"
"time"
"github.com/hashicorp/terraform/internal/communicator/remote"
"github.com/hashicorp/terraform/internal/provisioners"
"github.com/masterzen/winrm"
"github.com/packer-community/winrmcp/winrmcp"
"github.com/zclconf/go-cty/cty"
)
// Communicator represents the WinRM communicator
type Communicator struct {
connInfo *connectionInfo
client *winrm.Client
endpoint *winrm.Endpoint
rand *rand.Rand
}
// New creates a new communicator implementation over WinRM.
func New(v cty.Value) (*Communicator, error) {
connInfo, err := parseConnectionInfo(v)
if err != nil {
return nil, err
}
endpoint := &winrm.Endpoint{
Host: connInfo.Host,
Port: int(connInfo.Port),
HTTPS: connInfo.HTTPS,
Insecure: connInfo.Insecure,
Timeout: connInfo.TimeoutVal,
}
if len(connInfo.CACert) > 0 {
endpoint.CACert = []byte(connInfo.CACert)
}
comm := &Communicator{
connInfo: connInfo,
endpoint: endpoint,
// Seed our own rand source so that script paths are not deterministic
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
}
return comm, nil
}
// Connect implementation of communicator.Communicator interface
func (c *Communicator) Connect(o provisioners.UIOutput) error {
// Set the client to nil since we'll (re)create it
c.client = nil
params := winrm.DefaultParameters
params.Timeout = formatDuration(c.Timeout())
if c.connInfo.NTLM {
params.TransportDecorator = func() winrm.Transporter { return &winrm.ClientNTLM{} }
}
client, err := winrm.NewClientWithParameters(
c.endpoint, c.connInfo.User, c.connInfo.Password, params)
if err != nil {
return err
}
if o != nil {
o.Output(fmt.Sprintf(
"Connecting to remote host via WinRM...\n"+
" Host: %s\n"+
" Port: %d\n"+
" User: %s\n"+
" Password: %t\n"+
" HTTPS: %t\n"+
" Insecure: %t\n"+
" NTLM: %t\n"+
" CACert: %t",
c.connInfo.Host,
c.connInfo.Port,
c.connInfo.User,
c.connInfo.Password != "",
c.connInfo.HTTPS,
c.connInfo.Insecure,
c.connInfo.NTLM,
c.connInfo.CACert != "",
))
}
log.Printf("[DEBUG] connecting to remote shell using WinRM")
shell, err := client.CreateShell()
if err != nil {
log.Printf("[ERROR] error creating shell: %s", err)
return err
}
err = shell.Close()
if err != nil {
log.Printf("[ERROR] error closing shell: %s", err)
return err
}
if o != nil {
o.Output("Connected!")
}
c.client = client
return nil
}
// Disconnect implementation of communicator.Communicator interface
func (c *Communicator) Disconnect() error {
c.client = nil
return nil
}
// Timeout implementation of communicator.Communicator interface
func (c *Communicator) Timeout() time.Duration {
return c.connInfo.TimeoutVal
}
// ScriptPath implementation of communicator.Communicator interface
func (c *Communicator) ScriptPath() string {
return strings.Replace(
c.connInfo.ScriptPath, "%RAND%",
strconv.FormatInt(int64(c.rand.Int31()), 10), -1)
}
// Start implementation of communicator.Communicator interface
func (c *Communicator) Start(rc *remote.Cmd) error {
rc.Init()
log.Printf("[DEBUG] starting remote command: %s", rc.Command)
// TODO: make sure communicators always connect first, so we can get output
// from the connection.
if c.client == nil {
log.Println("[WARN] winrm client not connected, attempting to connect")
if err := c.Connect(nil); err != nil {
return err
}
}
status, err := c.client.Run(rc.Command, rc.Stdout, rc.Stderr)
rc.SetExitStatus(status, err)
return nil
}
// Upload implementation of communicator.Communicator interface
func (c *Communicator) Upload(path string, input io.Reader) error {
wcp, err := c.newCopyClient()
if err != nil {
return err
}
log.Printf("[DEBUG] Uploading file to '%s'", path)
return wcp.Write(path, input)
}
// UploadScript implementation of communicator.Communicator interface
func (c *Communicator) UploadScript(path string, input io.Reader) error {
return c.Upload(path, input)
}
// UploadDir implementation of communicator.Communicator interface
func (c *Communicator) UploadDir(dst string, src string) error {
log.Printf("[DEBUG] Uploading dir '%s' to '%s'", src, dst)
wcp, err := c.newCopyClient()
if err != nil {
return err
}
return wcp.Copy(src, dst)
}
func (c *Communicator) newCopyClient() (*winrmcp.Winrmcp, error) {
addr := fmt.Sprintf("%s:%d", c.endpoint.Host, c.endpoint.Port)
config := winrmcp.Config{
Auth: winrmcp.Auth{
User: c.connInfo.User,
Password: c.connInfo.Password,
},
Https: c.connInfo.HTTPS,
Insecure: c.connInfo.Insecure,
OperationTimeout: c.Timeout(),
MaxOperationsPerShell: 15, // lowest common denominator
}
if c.connInfo.NTLM {
config.TransportDecorator = func() winrm.Transporter { return &winrm.ClientNTLM{} }
}
if c.connInfo.CACert != "" {
config.CACertBytes = []byte(c.connInfo.CACert)
}
return winrmcp.New(addr, &config)
}