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scp.go
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scp.go
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package scp
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"code.cloudfoundry.org/lager/v3"
)
type SecureCopier interface {
Copy() error
}
type secureCopy struct {
options *Options
session *Session
}
func New(options *Options, stdin io.Reader, stdout io.Writer, stderr io.Writer, logger lager.Logger) SecureCopier {
session := NewSession(stdin, stdout, stderr, options.PreserveTimesAndMode, logger)
return &secureCopy{
options: options,
session: session,
}
}
func NewFromCommand(command string, stdin io.Reader, stdout io.Writer, stderr io.Writer, logger lager.Logger) (SecureCopier, error) {
cmd, err := ParseCommand(command)
if err != nil {
return nil, err
}
options, err := ParseFlags(cmd)
if err != nil {
return nil, err
}
return New(options, stdin, stdout, stderr, logger), nil
}
func (s *secureCopy) Copy() error {
if s.options.SourceMode {
var lastErr error
logger := s.session.logger.Session("source-mode")
logger.Info("started")
defer logger.Info("finished")
logger.Debug("awaiting-connection-confirmation")
err := s.session.awaitConfirmation()
if err != nil {
logger.Error("failed-confirmation", err)
return err
}
logger.Debug("received-connection-confirmation")
for _, sourceGlob := range s.options.Sources {
logger.Debug("evaluating-glob", lager.Data{"Source Glob": sourceGlob})
sources, err := filepath.Glob(sourceGlob)
if err != nil || len(sources) == 0 {
logger.Debug("failed-matching-glob", lager.Data{"Source Glob": sourceGlob})
sources = []string{sourceGlob}
}
for _, source := range sources {
logger.Debug("sending-source", lager.Data{"Source": source})
sourceInfo, err := os.Stat(source)
if err != nil {
logger.Error("failed-to-stat", err)
s.session.sendError(err.Error())
lastErr = err
continue
}
if sourceInfo.IsDir() && !s.options.Recursive {
err = fmt.Errorf("%s: not a regular file", sourceInfo.Name())
logger.Error("sending-non-recursive-directory-failed", err)
s.session.sendError(err.Error())
lastErr = err
continue
}
err = s.send(source)
if err != nil {
logger.Error("failed-sending-source", err, lager.Data{"Source": source})
lastErr = err
continue
}
logger.Debug("sent-source", lager.Data{"Source": source})
}
}
return lastErr
}
if s.options.TargetMode {
logger := s.session.logger.Session("target-mode")
logger.Info("started")
defer logger.Info("finished")
targetIsDir := false
targetInfo, err := os.Stat(s.options.Target)
if err == nil {
targetIsDir = targetInfo.IsDir()
}
if s.options.TargetIsDirectory {
if !targetIsDir {
err = errors.New("target is not a directory")
logger.Error("failed-target-directory-validation", err)
return err
}
}
err = s.session.sendConfirmation()
if err != nil {
logger.Error("failed-sending-confirmation", err)
return err
}
for {
var timeMessage *TimeMessage
var err error
messageType, err := s.session.peekByte()
if err == io.EOF {
return nil
}
if messageType == 'T' {
timeMessage = &TimeMessage{}
err := timeMessage.Receive(s.session)
if err != nil {
logger.Error("failed-receiving-time-message", err)
s.session.sendError(err.Error())
return err
}
messageType, err = s.session.peekByte()
if err == io.EOF {
return nil
}
}
if messageType == 'C' {
s.session.logger.Info("receiving-file", lager.Data{"Message Type": messageType})
err = s.ReceiveFile(s.options.Target, targetIsDir, timeMessage)
} else if messageType == 'D' {
err = s.ReceiveDirectory(s.options.Target, timeMessage)
} else {
err = fmt.Errorf("unexpected message type: %c", messageType)
logger.Error("unexpected-message", err)
s.session.sendError(err.Error())
return err
}
if err != nil {
logger.Error("failed-receiving-message", err)
s.session.sendError(err.Error())
return err
}
}
}
return nil
}
func (s *secureCopy) send(source string) error {
var err error
defer func() {
if err != nil {
s.session.sendError(err.Error())
}
}()
file, err := os.Open(source)
if err != nil {
return err
}
defer file.Close()
fileInfo, err := file.Stat()
if err != nil {
return err
}
if !fileInfo.IsDir() {
err = s.SendFile(file, fileInfo)
} else {
err = s.SendDirectory(file.Name(), fileInfo)
}
if err != nil {
return err
}
return err
}