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imagemounter.go
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imagemounter.go
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package imagemounter
import (
"errors"
"fmt"
"io"
"os"
"strings"
"github.com/Masterminds/semver"
"github.com/greficsmurf/go-ios/ios"
log "github.com/sirupsen/logrus"
)
const serviceName string = "com.apple.mobile.mobile_image_mounter"
// DeveloperDiskImageMounter to mobile image mounter
type DeveloperDiskImageMounter struct {
deviceConn ios.DeviceConnectionInterface
plistCodec ios.PlistCodec
version *semver.Version
plistRw ios.PlistCodecReadWriter
}
// ImageMounter mounts developer disk images to an iOS device, and give a list of already mounted images
type ImageMounter interface {
ListImages() ([][]byte, error)
MountImage(imagePath string) error
io.Closer
}
// NewDeveloperDiskImageMounter returns a new mobile image mounter DeveloperDiskImageMounter for the given device
func NewDeveloperDiskImageMounter(device ios.DeviceEntry, version *semver.Version) (*DeveloperDiskImageMounter, error) {
deviceConn, err := ios.ConnectToService(device, serviceName)
if err != nil {
return nil, err
}
return &DeveloperDiskImageMounter{
deviceConn: deviceConn,
plistCodec: ios.NewPlistCodec(),
version: version,
plistRw: ios.NewPlistCodecReadWriter(deviceConn.Reader(), deviceConn.Writer()),
}, nil
}
// NewImageMounter creates a new ImageMounter depending on the version of the given device.
// For iOS 17+ devices a PersonalizedDeveloperDiskImageMounter is created, and for all other devices
// a DeveloperDiskImageMounter gets created
func NewImageMounter(device ios.DeviceEntry) (ImageMounter, error) {
version, err := ios.GetProductVersion(device)
if err != nil {
return nil, fmt.Errorf("NewImageMounter: failed to get device version. %w", err)
}
if version.Major() < 17 {
return NewDeveloperDiskImageMounter(device, version)
} else {
return NewPersonalizedDeveloperDiskImageMounter(device, version)
}
}
// ListImages returns a list with signatures of installed developer images
func (conn *DeveloperDiskImageMounter) ListImages() ([][]byte, error) {
return listImages(conn.plistRw, "Developer", conn.version)
}
// MountImage installs a .dmg image from imagePath after checking that it is present and valid.
func (conn *DeveloperDiskImageMounter) MountImage(imagePath string) error {
signatureBytes, imageSize, err := validatePathAndLoadSignature(imagePath)
if err != nil {
return err
}
err = sendUploadRequest(conn.plistRw, "Developer", signatureBytes, uint64(imageSize))
if err != nil {
return err
}
imageFile, err := os.Open(imagePath)
if err != nil {
return err
}
defer imageFile.Close()
n, err := io.Copy(conn.deviceConn.Writer(), imageFile)
log.Debugf("%d bytes written", n)
if err != nil {
return err
}
err = waitForUploadComplete(conn.plistRw)
if err != nil {
return err
}
err = conn.mountImage(signatureBytes)
if err != nil {
return err
}
return hangUp(conn.plistRw)
}
func (conn *DeveloperDiskImageMounter) mountImage(signatureBytes []byte) error {
req := map[string]interface{}{
"Command": "MountImage",
"ImageSignature": signatureBytes,
"ImageType": "Developer",
}
log.Debugf("sending: %+v", req)
err := conn.plistRw.Write(req)
if err != nil {
return err
}
return nil
}
func validatePathAndLoadSignature(imagePath string) ([]byte, int64, error) {
imageFile, err := os.Open(imagePath)
if err != nil {
return []byte{}, 0, err
}
defer imageFile.Close()
// Get the file information
info, err := imageFile.Stat()
if err != nil {
return []byte{}, 0, err
}
if info.IsDir() {
return []byte{}, 0, errors.New("provided path is a directory")
}
if !strings.HasSuffix(imagePath, ".dmg") {
return []byte{}, 0, errors.New("provided path is not a dmg file")
}
signatureFile, err := os.Open(imagePath + ".signature")
if err != nil {
return []byte{}, 0, err
}
defer imageFile.Close()
signatureBytes, err := io.ReadAll(signatureFile)
if err != nil {
return []byte{}, 0, err
}
return signatureBytes, info.Size(), nil
}
// Close closes the underlying UsbMuxConnection
func (conn *DeveloperDiskImageMounter) Close() error {
return conn.deviceConn.Close()
}
func waitForUploadComplete(plistRw ios.PlistCodecReadWriter) error {
var plist map[string]interface{}
err := plistRw.Read(&plist)
if err != nil {
return err
}
log.Debugf("received complete: %+v", plist)
status, ok := plist["Status"]
if !ok {
return fmt.Errorf("unexpected response: %+v", plist)
}
if "Complete" != status {
return fmt.Errorf("unexpected response: %+v", plist)
}
return nil
}
func hangUp(plistRw ios.PlistCodecReadWriter) error {
req := map[string]interface{}{
"Command": "Hangup",
}
log.Debugf("sending: %+v", req)
return plistRw.Write(req)
}
func MountImage(device ios.DeviceEntry, path string) error {
conn, err := NewImageMounter(device)
if err != nil {
return fmt.Errorf("failed connecting to image mounter: %v", err)
}
defer conn.Close()
signatures, err := conn.ListImages()
if err != nil {
return fmt.Errorf("failed getting image list: %v", err)
}
if len(signatures) != 0 {
log.Warn("there is already a developer image mounted, reboot the device if you want to remove it. aborting.")
return nil
}
return conn.MountImage(path)
}
func listImages(prw ios.PlistCodecReadWriter, imageType string, v *semver.Version) ([][]byte, error) {
err := prw.Write(map[string]interface{}{
"Command": "LookupImage",
"ImageType": imageType,
})
if err != nil {
return nil, fmt.Errorf("listImages: failed to write command 'LookupImage': %w", err)
}
var resp map[string]interface{}
err = prw.Read(&resp)
if err != nil {
return nil, fmt.Errorf("listImages: failed to read response for 'LookupImage': %w", err)
}
deviceError, ok := resp["Error"]
if ok {
return nil, fmt.Errorf("listImages: device responded with error: %v", deviceError)
}
signatures, ok := resp["ImageSignature"]
if !ok {
if v.LessThan(ios.IOS14()) {
return [][]byte{}, nil
}
return nil, fmt.Errorf("listImages: invalid response: %+v", resp)
}
array, ok := signatures.([]interface{})
result := make([][]byte, len(array))
for i, intf := range array {
bytes, ok := intf.([]byte)
if !ok {
return nil, fmt.Errorf("listImages: could not convert %+v to byte slice", intf)
}
result[i] = bytes
}
return result, nil
}
func sendUploadRequest(plistRw ios.PlistCodecReadWriter, imageType string, signatureBytes []byte, fileSize uint64) error {
req := map[string]interface{}{
"Command": "ReceiveBytes",
"ImageSignature": signatureBytes,
"ImageSize": fileSize,
"ImageType": imageType,
}
log.Debugf("sending: %+v", req)
err := plistRw.Write(req)
if err != nil {
return fmt.Errorf("sendUploadRequest: failed to write command 'ReceiveBytes': %w", err)
}
var plist map[string]interface{}
err = plistRw.Read(&plist)
if err != nil {
return fmt.Errorf("sendUploadRequest: failed to read response for 'ReceiveBytes': %w", err)
}
log.Debugf("upload response: %+v", plist)
status, ok := plist["Status"]
if !ok {
return fmt.Errorf("sendUploadRequest: unexpected response: %+v", plist)
}
if "ReceiveBytesAck" != status {
return fmt.Errorf("sendUploadRequest: unexpected status: %+v", plist)
}
return nil
}
// Check if developer mode is enabled through the mobile_image_mounter service
func IsDevModeEnabled(device ios.DeviceEntry) (bool, error) {
conn, err := ios.ConnectToService(device, serviceName)
if err != nil {
return false, fmt.Errorf("IsDevModeEnabled: failed connecting to image mounter service with err: %w", err)
}
reader := conn.Reader()
request := map[string]interface{}{"Command": "QueryDeveloperModeStatus"}
plistCodec := ios.NewPlistCodec()
bytes, err := plistCodec.Encode(request)
if err != nil {
return false, fmt.Errorf("IsDevModeEnabled: failed encoding request to service with err: %w", err)
}
err = conn.Send(bytes)
if err != nil {
return false, fmt.Errorf("IsDevModeEnabled: failed sending request to service with err: %w", err)
}
responseBytes, err := plistCodec.Decode(reader)
if err != nil {
return false, fmt.Errorf("IsDevModeEnabled: failed decoding service response with err: %w", err)
}
plist, err := ios.ParsePlist(responseBytes)
if err != nil {
return false, fmt.Errorf("IsDevModeEnabled: failed parsing service response with err: %w", err)
}
if val, ok := plist["DeveloperModeStatus"]; ok {
if assertedVal, ok := val.(bool); ok {
return assertedVal, nil
}
return false, fmt.Errorf("IsDevModeEnabled: failed type assertion on DeveloperModeStatus value from service response")
}
return false, nil
}