The return of rawbu. For other nefarious purposes.
Change-Id: I3e9c892cb6ee79e85bc4d9b817f4ad9942a73b4e
diff --git a/cmds/rawbu/backup.cpp b/cmds/rawbu/backup.cpp
new file mode 100644
index 0000000..394ce41
--- /dev/null
+++ b/cmds/rawbu/backup.cpp
@@ -0,0 +1,729 @@
+// Copyright 2009 The Android Open Source Project
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <dirent.h>
+#include <errno.h>
+#include <assert.h>
+#include <ctype.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <cutils/properties.h>
+
+#include <private/android_filesystem_config.h>
+
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+// First version.
+#define FILE_VERSION_1 0xffff0001
+
+// Introduces backup all option to header.
+#define FILE_VERSION_2 0xffff0002
+
+#define FILE_VERSION FILE_VERSION_2
+
+namespace android {
+
+static char nameBuffer[PATH_MAX];
+static struct stat statBuffer;
+
+static char copyBuffer[8192];
+
+static uint32_t inputFileVersion;
+
+static int opt_backupAll;
+
+#define SPECIAL_NO_TOUCH 0
+#define SPECIAL_NO_BACKUP 1
+
+struct special_dir {
+ const char* path;
+ int type;
+};
+
+/* Directory paths that we will not backup/restore */
+static const struct special_dir SKIP_PATHS[] = {
+ { "/data/misc", SPECIAL_NO_TOUCH },
+ { "/data/system/batterystats.bin", SPECIAL_NO_TOUCH },
+ { "/data/system/location", SPECIAL_NO_TOUCH },
+ { "/data/dalvik-cache", SPECIAL_NO_BACKUP },
+ { NULL, 0 },
+};
+
+/* This is just copied from the shell's built-in wipe command. */
+static int wipe (const char *path)
+{
+ DIR *dir;
+ struct dirent *de;
+ int ret;
+ int i;
+
+ dir = opendir(path);
+
+ if (dir == NULL) {
+ fprintf (stderr, "Error opendir'ing %s: %s\n",
+ path, strerror(errno));
+ return 0;
+ }
+
+ char *filenameOffset;
+
+ strcpy(nameBuffer, path);
+ strcat(nameBuffer, "/");
+
+ filenameOffset = nameBuffer + strlen(nameBuffer);
+
+ for (;;) {
+ de = readdir(dir);
+
+ if (de == NULL) {
+ break;
+ }
+
+ if (0 == strcmp(de->d_name, ".")
+ || 0 == strcmp(de->d_name, "..")
+ || 0 == strcmp(de->d_name, "lost+found")
+ ) {
+ continue;
+ }
+
+ strcpy(filenameOffset, de->d_name);
+ bool noBackup = false;
+
+ /* See if this is a path we should skip. */
+ for (i = 0; SKIP_PATHS[i].path; i++) {
+ if (strcmp(SKIP_PATHS[i].path, nameBuffer) == 0) {
+ if (opt_backupAll || SKIP_PATHS[i].type == SPECIAL_NO_BACKUP) {
+ // In this case we didn't back up the directory --
+ // we do want to wipe its contents, but not the
+ // directory itself, since the restore file won't
+ // contain the directory.
+ noBackup = true;
+ }
+ break;
+ }
+ }
+
+ if (!noBackup && SKIP_PATHS[i].path != NULL) {
+ // This is a SPECIAL_NO_TOUCH directory.
+ continue;
+ }
+
+ ret = lstat (nameBuffer, &statBuffer);
+
+ if (ret != 0) {
+ fprintf(stderr, "warning -- stat() error on '%s': %s\n",
+ nameBuffer, strerror(errno));
+ continue;
+ }
+
+ if(S_ISDIR(statBuffer.st_mode)) {
+ int i;
+ char *newpath;
+
+ newpath = strdup(nameBuffer);
+ if (wipe(newpath) == 0) {
+ free(newpath);
+ closedir(dir);
+ return 0;
+ }
+
+ if (!noBackup) {
+ ret = rmdir(newpath);
+ if (ret != 0) {
+ fprintf(stderr, "warning -- rmdir() error on '%s': %s\n",
+ newpath, strerror(errno));
+ }
+ }
+
+ free(newpath);
+
+ strcpy(nameBuffer, path);
+ strcat(nameBuffer, "/");
+
+ } else {
+ ret = unlink(nameBuffer);
+
+ if (ret != 0) {
+ fprintf(stderr, "warning -- unlink() error on '%s': %s\n",
+ nameBuffer, strerror(errno));
+ }
+ }
+ }
+
+ closedir(dir);
+
+ return 1;
+}
+
+static int write_int32(FILE* fh, int32_t val)
+{
+ int res = fwrite(&val, 1, sizeof(val), fh);
+ if (res != sizeof(val)) {
+ fprintf(stderr, "unable to write int32 (%d bytes): %s\n", res, strerror(errno));
+ return 0;
+ }
+
+ return 1;
+}
+
+static int write_int64(FILE* fh, int64_t val)
+{
+ int res = fwrite(&val, 1, sizeof(val), fh);
+ if (res != sizeof(val)) {
+ fprintf(stderr, "unable to write int64 (%d bytes): %s\n", res, strerror(errno));
+ return 0;
+ }
+
+ return 1;
+}
+
+static int copy_file(FILE* dest, FILE* src, off_t size, const char* destName,
+ const char* srcName)
+{
+ errno = 0;
+
+ off_t origSize = size;
+
+ while (size > 0) {
+ int amt = size > (off_t)sizeof(copyBuffer) ? sizeof(copyBuffer) : (int)size;
+ int readLen = fread(copyBuffer, 1, amt, src);
+ if (readLen <= 0) {
+ if (srcName != NULL) {
+ fprintf(stderr, "unable to read source (%d of %ld bytes) file '%s': %s\n",
+ amt, origSize, srcName, errno != 0 ? strerror(errno) : "unexpected EOF");
+ } else {
+ fprintf(stderr, "unable to read buffer (%d of %ld bytes): %s\n",
+ amt, origSize, errno != 0 ? strerror(errno) : "unexpected EOF");
+ }
+ return 0;
+ }
+ int writeLen = fwrite(copyBuffer, 1, readLen, dest);
+ if (writeLen != readLen) {
+ if (destName != NULL) {
+ fprintf(stderr, "unable to write file (%d of %d bytes) '%s': '%s'\n",
+ writeLen, readLen, destName, strerror(errno));
+ } else {
+ fprintf(stderr, "unable to write buffer (%d of %d bytes): '%s'\n",
+ writeLen, readLen, strerror(errno));
+ }
+ return 0;
+ }
+ size -= readLen;
+ }
+ return 1;
+}
+
+#define TYPE_END 0
+#define TYPE_DIR 1
+#define TYPE_FILE 2
+
+static int write_header(FILE* fh, int type, const char* path, const struct stat* st)
+{
+ int pathLen = strlen(path);
+ if (!write_int32(fh, type)) return 0;
+ if (!write_int32(fh, pathLen)) return 0;
+ if (fwrite(path, 1, pathLen, fh) != (size_t)pathLen) {
+ fprintf(stderr, "unable to write: %s\n", strerror(errno));
+ return 0;
+ }
+
+ if (!write_int32(fh, st->st_uid)) return 0;
+ if (!write_int32(fh, st->st_gid)) return 0;
+ if (!write_int32(fh, st->st_mode)) return 0;
+ if (!write_int64(fh, ((int64_t)st->st_atime)*1000*1000*1000)) return 0;
+ if (!write_int64(fh, ((int64_t)st->st_mtime)*1000*1000*1000)) return 0;
+ if (!write_int64(fh, ((int64_t)st->st_ctime)*1000*1000*1000)) return 0;
+
+ return 1;
+}
+
+static int backup_dir(FILE* fh, const char* srcPath)
+{
+ DIR *dir;
+ struct dirent *de;
+ char* fullPath = NULL;
+ int srcLen = strlen(srcPath);
+ int result = 1;
+ int i;
+
+ dir = opendir(srcPath);
+
+ if (dir == NULL) {
+ fprintf (stderr, "error opendir'ing '%s': %s\n",
+ srcPath, strerror(errno));
+ return 0;
+ }
+
+ for (;;) {
+ de = readdir(dir);
+
+ if (de == NULL) {
+ break;
+ }
+
+ if (0 == strcmp(de->d_name, ".")
+ || 0 == strcmp(de->d_name, "..")
+ || 0 == strcmp(de->d_name, "lost+found")
+ ) {
+ continue;
+ }
+
+ if (fullPath == NULL) {
+ free(fullPath);
+ }
+ fullPath = (char*)malloc(srcLen + strlen(de->d_name) + 2);
+ strcpy(fullPath, srcPath);
+ fullPath[srcLen] = '/';
+ strcpy(fullPath+srcLen+1, de->d_name);
+
+ /* See if this is a path we should skip. */
+ if (!opt_backupAll) {
+ for (i = 0; SKIP_PATHS[i].path; i++) {
+ if (strcmp(SKIP_PATHS[i].path, fullPath) == 0) {
+ break;
+ }
+ }
+ if (SKIP_PATHS[i].path != NULL) {
+ continue;
+ }
+ }
+
+ int ret = lstat(fullPath, &statBuffer);
+
+ if (ret != 0) {
+ fprintf(stderr, "stat() error on '%s': %s\n",
+ fullPath, strerror(errno));
+ result = 0;
+ goto done;
+ }
+
+ if(S_ISDIR(statBuffer.st_mode)) {
+ printf("Saving dir %s...\n", fullPath);
+
+ if (write_header(fh, TYPE_DIR, fullPath, &statBuffer) == 0) {
+ result = 0;
+ goto done;
+ }
+ if (backup_dir(fh, fullPath) == 0) {
+ result = 0;
+ goto done;
+ }
+ } else {
+ printf("Saving file %s...\n", fullPath);
+
+ if (write_header(fh, TYPE_FILE, fullPath, &statBuffer) == 0) {
+ result = 0;
+ goto done;
+ }
+
+ off_t size = statBuffer.st_size;
+ if (!write_int64(fh, size)) {
+ result = 0;
+ goto done;
+ }
+
+ FILE* src = fopen(fullPath, "r");
+ if (src == NULL) {
+ fprintf(stderr, "unable to open source file '%s': %s\n",
+ fullPath, strerror(errno));
+ result = 0;
+ goto done;
+ }
+
+ int copyres = copy_file(fh, src, size, NULL, fullPath);
+ fclose(src);
+ if (!copyres) {
+ result = 0;
+ goto done;
+ }
+ }
+ }
+
+done:
+ if (fullPath != NULL) {
+ free(fullPath);
+ }
+
+ closedir(dir);
+
+ return result;
+}
+
+static int backup_data(const char* destPath)
+{
+ int res = -1;
+
+ FILE* fh = fopen(destPath, "w");
+ if (fh == NULL) {
+ fprintf(stderr, "unable to open destination '%s': %s\n",
+ destPath, strerror(errno));
+ return -1;
+ }
+
+ printf("Backing up /data to %s...\n", destPath);
+
+ if (!write_int32(fh, FILE_VERSION)) goto done;
+ if (!write_int32(fh, opt_backupAll)) goto done;
+ if (!backup_dir(fh, "/data")) goto done;
+ if (!write_int32(fh, 0)) goto done;
+
+ res = 0;
+
+done:
+ if (fflush(fh) != 0) {
+ fprintf(stderr, "error flushing destination '%s': %s\n",
+ destPath, strerror(errno));
+ res = -1;
+ goto donedone;
+ }
+ if (fsync(fileno(fh)) != 0) {
+ fprintf(stderr, "error syncing destination '%s': %s\n",
+ destPath, strerror(errno));
+ res = -1;
+ goto donedone;
+ }
+ fclose(fh);
+ sync();
+
+donedone:
+ return res;
+}
+
+static int32_t read_int32(FILE* fh, int32_t defVal)
+{
+ int32_t val;
+ if (fread(&val, 1, sizeof(val), fh) != sizeof(val)) {
+ fprintf(stderr, "unable to read: %s\n", strerror(errno));
+ return defVal;
+ }
+
+ return val;
+}
+
+static int64_t read_int64(FILE* fh, int64_t defVal)
+{
+ int64_t val;
+ if (fread(&val, 1, sizeof(val), fh) != sizeof(val)) {
+ fprintf(stderr, "unable to read: %s\n", strerror(errno));
+ return defVal;
+ }
+
+ return val;
+}
+
+static int read_header(FILE* fh, int* type, char** path, struct stat* st)
+{
+ *type = read_int32(fh, -1);
+ if (*type == TYPE_END) {
+ return 1;
+ }
+
+ if (*type < 0) {
+ fprintf(stderr, "bad token %d in restore file\n", *type);
+ return 0;
+ }
+
+ int32_t pathLen = read_int32(fh, -1);
+ if (pathLen <= 0) {
+ fprintf(stderr, "bad path length %d in restore file\n", pathLen);
+ return 0;
+ }
+ char* readPath = (char*)malloc(pathLen+1);
+ if (fread(readPath, 1, pathLen, fh) != (size_t)pathLen) {
+ fprintf(stderr, "truncated path in restore file\n");
+ free(readPath);
+ return 0;
+ }
+ readPath[pathLen] = 0;
+ *path = readPath;
+
+ st->st_uid = read_int32(fh, -1);
+ if (st->st_uid == (uid_t)-1) {
+ fprintf(stderr, "bad uid in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ st->st_gid = read_int32(fh, -1);
+ if (st->st_gid == (gid_t)-1) {
+ fprintf(stderr, "bad gid in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ st->st_mode = read_int32(fh, -1);
+ if (st->st_mode == (mode_t)-1) {
+ fprintf(stderr, "bad mode in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ int64_t ltime = read_int64(fh, -1);
+ if (ltime < 0) {
+ fprintf(stderr, "bad atime in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ st->st_atime = (time_t)(ltime/1000/1000/1000);
+ ltime = read_int64(fh, -1);
+ if (ltime < 0) {
+ fprintf(stderr, "bad mtime in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ st->st_mtime = (time_t)(ltime/1000/1000/1000);
+ ltime = read_int64(fh, -1);
+ if (ltime < 0) {
+ fprintf(stderr, "bad ctime in restore file at '%s'\n", readPath);
+ return 0;
+ }
+ st->st_ctime = (time_t)(ltime/1000/1000/1000);
+
+ st->st_mode &= (S_IRWXU|S_IRWXG|S_IRWXO);
+
+ return 1;
+}
+
+static int restore_data(const char* srcPath)
+{
+ int res = -1;
+
+ FILE* fh = fopen(srcPath, "r");
+ if (fh == NULL) {
+ fprintf(stderr, "Unable to open source '%s': %s\n",
+ srcPath, strerror(errno));
+ return -1;
+ }
+
+ inputFileVersion = read_int32(fh, 0);
+ if (inputFileVersion < FILE_VERSION_1 || inputFileVersion > FILE_VERSION) {
+ fprintf(stderr, "Restore file has bad version: 0x%x\n", inputFileVersion);
+ goto done;
+ }
+
+ if (inputFileVersion >= FILE_VERSION_2) {
+ opt_backupAll = read_int32(fh, 0);
+ } else {
+ opt_backupAll = 0;
+ }
+
+ printf("Wiping contents of /data...\n");
+ if (!wipe("/data")) {
+ goto done;
+ }
+
+ printf("Restoring from %s to /data...\n", srcPath);
+
+ while (1) {
+ int type;
+ char* path = NULL;
+ if (read_header(fh, &type, &path, &statBuffer) == 0) {
+ goto done;
+ }
+ if (type == 0) {
+ break;
+ }
+
+ const char* typeName = "?";
+
+ if (type == TYPE_DIR) {
+ typeName = "dir";
+
+ printf("Restoring dir %s...\n", path);
+
+ if (mkdir(path, statBuffer.st_mode) != 0) {
+ if (errno != EEXIST) {
+ fprintf(stderr, "unable to create directory '%s': %s\n",
+ path, strerror(errno));
+ free(path);
+ goto done;
+ }
+ }
+
+ } else if (type == TYPE_FILE) {
+ typeName = "file";
+ off_t size = read_int64(fh, -1);
+ if (size < 0) {
+ fprintf(stderr, "bad file size %ld in restore file\n", size);
+ free(path);
+ goto done;
+ }
+
+ printf("Restoring file %s...\n", path);
+
+ FILE* dest = fopen(path, "w");
+ if (dest == NULL) {
+ fprintf(stderr, "unable to open destination file '%s': %s\n",
+ path, strerror(errno));
+ free(path);
+ goto done;
+ }
+
+ int copyres = copy_file(dest, fh, size, path, NULL);
+ fclose(dest);
+ if (!copyres) {
+ free(path);
+ goto done;
+ }
+
+ } else {
+ fprintf(stderr, "unknown node type %d\n", type);
+ goto done;
+ }
+
+ // Do this even for directories, since the dir may have already existed
+ // so we need to make sure it gets the correct mode.
+ if (chmod(path, statBuffer.st_mode&(S_IRWXU|S_IRWXG|S_IRWXO)) != 0) {
+ fprintf(stderr, "unable to chmod destination %s '%s' to 0x%x: %s\n",
+ typeName, path, statBuffer.st_mode, strerror(errno));
+ free(path);
+ goto done;
+ }
+
+ if (chown(path, statBuffer.st_uid, statBuffer.st_gid) != 0) {
+ fprintf(stderr, "unable to chown destination %s '%s' to uid %d / gid %d: %s\n",
+ typeName, path, (int)statBuffer.st_uid, (int)statBuffer.st_gid, strerror(errno));
+ free(path);
+ goto done;
+ }
+
+ struct utimbuf timbuf;
+ timbuf.actime = statBuffer.st_atime;
+ timbuf.modtime = statBuffer.st_mtime;
+ if (utime(path, &timbuf) != 0) {
+ fprintf(stderr, "unable to utime destination %s '%s': %s\n",
+ typeName, path, strerror(errno));
+ free(path);
+ goto done;
+ }
+
+
+ free(path);
+ }
+
+ res = 0;
+
+done:
+ fclose(fh);
+
+ return res;
+}
+
+static void show_help(const char *cmd)
+{
+ fprintf(stderr,"Usage: %s COMMAND [options] [backup-file-path]\n", cmd);
+
+ fprintf(stderr, "commands are:\n"
+ " help Show this help text.\n"
+ " backup Perform a backup of /data.\n"
+ " restore Perform a restore of /data.\n");
+ fprintf(stderr, "options include:\n"
+ " -h Show this help text.\n"
+ " -a Backup all files.\n");
+ fprintf(stderr, "\nThe %s command allows you to perform low-level\n"
+ "backup and restore of the /data partition. This is\n"
+ "where all user data is kept, allowing for a fairly\n"
+ "complete restore of a device's state. Note that\n"
+ "because this is low-level, it will only work across\n"
+ "builds of the same (or very similar) device software.\n",
+ cmd);
+}
+
+} /* namespace android */
+
+int main (int argc, char **argv)
+{
+ int restore = 0;
+
+ if (getuid() != AID_ROOT) {
+ fprintf(stderr, "error -- %s must run as root\n", argv[0]);
+ exit(-1);
+ }
+
+ if (argc < 2) {
+ fprintf(stderr, "No command specified.\n");
+ android::show_help(argv[0]);
+ exit(-1);
+ }
+
+ if (0 == strcmp(argv[1], "restore")) {
+ restore = 1;
+ } else if (0 == strcmp(argv[1], "help")) {
+ android::show_help(argv[0]);
+ exit(0);
+ } else if (0 != strcmp(argv[1], "backup")) {
+ fprintf(stderr, "Unknown command: %s\n", argv[1]);
+ android::show_help(argv[0]);
+ exit(-1);
+ }
+
+ android::opt_backupAll = 0;
+
+ optind = 2;
+
+ for (;;) {
+ int ret;
+
+ ret = getopt(argc, argv, "ah");
+
+ if (ret < 0) {
+ break;
+ }
+
+ switch(ret) {
+ case 'a':
+ android::opt_backupAll = 1;
+ if (restore) fprintf(stderr, "Warning: -a option ignored on restore\n");
+ break;
+ case 'h':
+ android::show_help(argv[0]);
+ exit(0);
+ break;
+
+ default:
+ fprintf(stderr,"Unrecognized Option\n");
+ android::show_help(argv[0]);
+ exit(-1);
+ break;
+ }
+ }
+
+ const char* backupFile = "/sdcard/backup.dat";
+
+ if (argc > optind) {
+ backupFile = argv[optind];
+ optind++;
+ if (argc != optind) {
+ fprintf(stderr, "Too many arguments\n");
+ android::show_help(argv[0]);
+ exit(-1);
+ }
+ }
+
+ printf("Stopping system...\n");
+ property_set("ctl.stop", "runtime");
+ property_set("ctl.stop", "zygote");
+ sleep(1);
+
+ int res;
+ if (restore) {
+ res = android::restore_data(backupFile);
+ if (res != 0) {
+ // Don't restart system, since the data partition is hosed.
+ return res;
+ }
+ printf("Restore complete! Restarting system, cross your fingers...\n");
+ } else {
+ res = android::backup_data(backupFile);
+ if (res == 0) {
+ printf("Backup complete! Restarting system...\n");
+ } else {
+ printf("Restarting system...\n");
+ }
+ }
+
+ property_set("ctl.start", "zygote");
+ property_set("ctl.start", "runtime");
+}