idevicebackup2: add --source option to allow using backup directories from other devices

1 files changed, 39 insertions, 76 deletions

diff --git a/tools/idevicebackup2.c b/tools/idevicebackup2.c
index 0a06f3f..7256ee9 100644
--- a/tools/idevicebackup2.c
+++ b/tools/idevicebackup2.c
@@ -472,67 +472,6 @@ static int mb2_status_check_snapshot_state(const char *path, const char *udid, c
         return ret;
 }
 
-static int mobilebackup_info_is_current_device(plist_t info)
-{
-        plist_t value_node = NULL;
-        plist_t node = NULL;
-        plist_t root_node = NULL;
-        int ret = 0;
-
-        if (!info)
-                return ret;
-
-        if (plist_get_node_type(info) != PLIST_DICT)
-                return ret;
-
-        /* get basic device information in one go */
-        lockdownd_get_value(client, NULL, NULL, &root_node);
-
-        /* verify UDID */
-        value_node = plist_dict_get_item(root_node, "UniqueDeviceID");
-        node = plist_dict_get_item(info, "Target Identifier");
-
-        if(plist_compare_node_value(value_node, node))
-                ret = 1;
-        else {
-                printf("Info.plist: UniqueDeviceID does not match.\n");
-        }
-
-        /* verify SerialNumber */
-        if (ret == 1) {
-                value_node = plist_dict_get_item(root_node, "SerialNumber");
-                node = plist_dict_get_item(info, "Serial Number");
-
-                if(plist_compare_node_value(value_node, node))
-                        ret = 1;
-                else {
-                        printf("Info.plist: SerialNumber does not match.\n");
-                        ret = 0;
-                }
-        }
-
-        /* verify ProductVersion to prevent using backup with different OS version */
-        if (ret == 1) {
-                value_node = plist_dict_get_item(root_node, "ProductVersion");
-                node = plist_dict_get_item(info, "Product Version");
-
-                if(plist_compare_node_value(value_node, node))
-                        ret = 1;
-                else {
-                        printf("Info.plist: ProductVersion does not match.\n");
-                        ret = 0;
-                }
-        }
-
-        plist_free(root_node);
-        root_node = NULL;
-
-        value_node = NULL;
-        node = NULL;
-
-        return ret;
-}
-
 static void do_post_notification(const char *notification)
 {
         uint16_t nport = 0;
@@ -1186,6 +1125,7 @@ static void print_usage(int argc, char **argv)
         printf("options:\n");
         printf("  -d, --debug\t\tenable communication debugging\n");
         printf("  -u, --udid UDID\ttarget specific device by its 40-digit device UDID\n");
+        printf("  -s, --source UDID\tuse backup data from device specified by UDID\n");
         printf("  -h, --help\t\tprints usage information\n");
         printf("\n");
 }
@@ -1195,6 +1135,7 @@ int main(int argc, char *argv[])
         idevice_error_t ret = IDEVICE_E_UNKNOWN_ERROR;
         int i;
         char* udid = NULL;
+        char* source_udid = NULL;
         uint16_t port = 0;
         int cmd = -1;
         int cmd_flags = 0;
@@ -1229,6 +1170,15 @@ int main(int argc, char *argv[])
                         udid = strdup(argv[i]);
                         continue;
                 }
+                else if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--source")) {
+                        i++;
+                        if (!argv[i] || (strlen(argv[i]) != 40)) {
+                                print_usage(argc, argv);
+                                return 0;
+                        }
+                        source_udid = strdup(argv[i]);
+                        continue;
+                }
                 else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
                         print_usage(argc, argv);
                         return 0;
@@ -1307,12 +1257,16 @@ int main(int argc, char *argv[])
                 idevice_get_udid(device, &udid);
         }
 
+        if (!source_udid) {
+                source_udid = strdup(udid);
+        }
+
         /* backup directory must contain an Info.plist */
-        char *info_path = build_path(backup_directory, udid, "Info.plist", NULL);
+        char *info_path = build_path(backup_directory, source_udid, "Info.plist", NULL);
         if (cmd == CMD_RESTORE) {
                 if (stat(info_path, &st) != 0) {
                         free(info_path);
-                        printf("ERROR: Backup directory \"%s\" is invalid. No Info.plist found for UDID %s.\n", backup_directory, udid);
+                        printf("ERROR: Backup directory \"%s\" is invalid. No Info.plist found for UDID %s.\n", backup_directory, source_udid);
                         return -1;
                 }
         }
@@ -1387,12 +1341,6 @@ int main(int argc, char *argv[])
                                 printf("Could not read Info.plist\n");
                                 is_full_backup = 1;
                         }
-                        if (info_plist && ((cmd == CMD_BACKUP) || (cmd == CMD_RESTORE))) {
-                                if (!mobilebackup_info_is_current_device(info_plist)) {
-                                        printf("Aborting. Backup data is not compatible with the current device.\n");
-                                        cmd = CMD_LEAVE;
-                                }
-                        }
                 } else {
                         if (cmd == CMD_RESTORE) {
                                 printf("Aborting restore. Info.plist is missing.\n");
@@ -1440,10 +1388,22 @@ checkpoint:
                         PRINT_VERBOSE(1, "Starting backup...\n");
 
                         /* make sure backup device sub-directory exists */
-                        char *devbackupdir = build_path(backup_directory, udid, NULL);
+                        char* devbackupdir = build_path(backup_directory, source_udid, NULL);
                         __mkdir(devbackupdir, 0755);
                         free(devbackupdir);
 
+                        if (strcmp(source_udid, udid) != 0) {
+                                /* handle different source backup directory */
+                                // make sure target backup device sub-directory exists
+                                devbackupdir = build_path(backup_directory, udid, NULL);
+                                __mkdir(devbackupdir, 0755);
+                                free(devbackupdir);
+
+                                // use Info.plist path in target backup folder */
+                                free(info_path);
+                                info_path = build_path(backup_directory, udid, "Info.plist", NULL);
+                        }
+
                         /* TODO: check domain com.apple.mobile.backup key RequiresEncrypt and WillEncrypt with lockdown */
                         /* TODO: verify battery on AC enough battery remaining */       
 
@@ -1463,7 +1423,7 @@ checkpoint:
                         /* request backup from device with manifest from last backup */
                         PRINT_VERBOSE(1, "Requesting backup from device...\n");
 
-                        err = mobilebackup2_send_request(mobilebackup2, "Backup", udid, NULL, NULL);
+                        err = mobilebackup2_send_request(mobilebackup2, "Backup", udid, source_udid, NULL);
                         if (err == MOBILEBACKUP2_E_SUCCESS) {
                                 if (is_full_backup) {
                                         PRINT_VERBOSE(1, "Full backup mode.\n");
@@ -1485,7 +1445,7 @@ checkpoint:
                         /* TODO: verify battery on AC enough battery remaining */
 
                         /* verify if Status.plist says we read from an successful backup */
-                        if (!mb2_status_check_snapshot_state(backup_directory, udid, "finished")) {
+                        if (!mb2_status_check_snapshot_state(backup_directory, source_udid, "finished")) {
                                 printf("ERROR: Cannot ensure we restore from a successful backup. Aborting.\n");
                                 cmd = CMD_LEAVE;
                                 break;
@@ -1505,7 +1465,7 @@ checkpoint:
                         plist_dict_insert_item(opts, "RestorePreserveSettings", plist_new_bool((cmd_flags & CMD_FLAG_RESTORE_SETTINGS) == 0));
                         PRINT_VERBOSE(1, "Preserve settings of device: %s\n", ((cmd_flags & CMD_FLAG_RESTORE_SETTINGS) == 0  ? "Yes":"No"));
 
-                        err = mobilebackup2_send_request(mobilebackup2, "Restore", udid, udid, opts);
+                        err = mobilebackup2_send_request(mobilebackup2, "Restore", udid, source_udid, opts);
                         plist_free(opts);
                         if (err != MOBILEBACKUP2_E_SUCCESS) {
                                 if (err == MOBILEBACKUP2_E_BAD_VERSION) {
@@ -1520,7 +1480,7 @@ checkpoint:
                         break;
                         case CMD_INFO:
                         PRINT_VERBOSE(1, "Requesting backup info from device...\n");
-                        err = mobilebackup2_send_request(mobilebackup2, "Info", udid, NULL, NULL);
+                        err = mobilebackup2_send_request(mobilebackup2, "Info", udid, source_udid, NULL);
                         if (err != MOBILEBACKUP2_E_SUCCESS) {
                                 printf("Error requesting backup info from device, error code %d\n", err);
                                 cmd = CMD_LEAVE;
@@ -1528,7 +1488,7 @@ checkpoint:
                         break;
                         case CMD_LIST:
                         PRINT_VERBOSE(1, "Requesting backup list from device...\n");
-                        err = mobilebackup2_send_request(mobilebackup2, "List", udid, NULL, NULL);
+                        err = mobilebackup2_send_request(mobilebackup2, "List", udid, source_udid, NULL);
                         if (err != MOBILEBACKUP2_E_SUCCESS) {
                                 printf("Error requesting backup list from device, error code %d\n", err);
                                 cmd = CMD_LEAVE;
@@ -1536,7 +1496,7 @@ checkpoint:
                         break;
                         case CMD_UNBACK:
                         PRINT_VERBOSE(1, "Starting to unpack backup...\n");
-                        err = mobilebackup2_send_request(mobilebackup2, "Unback", udid, NULL, NULL);
+                        err = mobilebackup2_send_request(mobilebackup2, "Unback", udid, source_udid, NULL);
                         if (err != MOBILEBACKUP2_E_SUCCESS) {
                                 printf("Error requesting unback operation from device, error code %d\n", err);
                                 cmd = CMD_LEAVE;
@@ -1889,6 +1849,9 @@ files_out:
         if (udid) {
                 free(udid);
         }
+        if (source_udid) {
+                free(source_udid);
+        }
 
         return 0;
 }