1315 lines
36 KiB
C++
1315 lines
36 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "file_backup_helper"
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#include <utils/BackupHelpers.h>
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#include <utils/KeyedVector.h>
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#include <utils/ByteOrder.h>
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#include <utils/String8.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/stat.h>
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#include <sys/time.h> // for utimes
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <utime.h>
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#include <fcntl.h>
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#include <zlib.h>
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#include <cutils/log.h>
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namespace android {
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#define MAGIC0 0x70616e53 // Snap
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#define MAGIC1 0x656c6946 // File
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/*
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* File entity data format (v1):
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*
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* - 4-byte version number of the metadata, little endian (0x00000001 for v1)
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* - 12 bytes of metadata
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* - the file data itself
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*
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* i.e. a 16-byte metadata header followed by the raw file data. If the
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* restore code does not recognize the metadata version, it can still
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* interpret the file data itself correctly.
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*
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* file_metadata_v1:
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*
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* - 4 byte version number === 0x00000001 (little endian)
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* - 4-byte access mode (little-endian)
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* - undefined (8 bytes)
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*/
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struct file_metadata_v1 {
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int version;
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int mode;
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int undefined_1;
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int undefined_2;
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};
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const static int CURRENT_METADATA_VERSION = 1;
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#if 1
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#define LOGP(f, x...)
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#else
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#if TEST_BACKUP_HELPERS
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#define LOGP(f, x...) printf(f "\n", x)
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#else
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#define LOGP(x...) LOGD(x)
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#endif
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#endif
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const static int ROUND_UP[4] = { 0, 3, 2, 1 };
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static inline int
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round_up(int n)
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{
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return n + ROUND_UP[n % 4];
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}
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static int
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read_snapshot_file(int fd, KeyedVector<String8,FileState>* snapshot)
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{
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int bytesRead = 0;
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int amt;
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SnapshotHeader header;
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amt = read(fd, &header, sizeof(header));
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if (amt != sizeof(header)) {
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return errno;
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}
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bytesRead += amt;
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if (header.magic0 != MAGIC0 || header.magic1 != MAGIC1) {
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LOGW("read_snapshot_file header.magic0=0x%08x magic1=0x%08x", header.magic0, header.magic1);
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return 1;
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}
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for (int i=0; i<header.fileCount; i++) {
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FileState file;
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char filenameBuf[128];
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amt = read(fd, &file, sizeof(FileState));
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if (amt != sizeof(FileState)) {
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LOGW("read_snapshot_file FileState truncated/error with read at %d bytes\n", bytesRead);
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return 1;
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}
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bytesRead += amt;
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// filename is not NULL terminated, but it is padded
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int nameBufSize = round_up(file.nameLen);
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char* filename = nameBufSize <= (int)sizeof(filenameBuf)
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? filenameBuf
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: (char*)malloc(nameBufSize);
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amt = read(fd, filename, nameBufSize);
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if (amt == nameBufSize) {
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snapshot->add(String8(filename, file.nameLen), file);
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}
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bytesRead += amt;
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if (filename != filenameBuf) {
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free(filename);
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}
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if (amt != nameBufSize) {
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LOGW("read_snapshot_file filename truncated/error with read at %d bytes\n", bytesRead);
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return 1;
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}
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}
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if (header.totalSize != bytesRead) {
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LOGW("read_snapshot_file length mismatch: header.totalSize=%d bytesRead=%d\n",
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header.totalSize, bytesRead);
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return 1;
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}
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return 0;
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}
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static int
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write_snapshot_file(int fd, const KeyedVector<String8,FileRec>& snapshot)
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{
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int fileCount = 0;
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int bytesWritten = sizeof(SnapshotHeader);
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// preflight size
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const int N = snapshot.size();
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for (int i=0; i<N; i++) {
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const FileRec& g = snapshot.valueAt(i);
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if (!g.deleted) {
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const String8& name = snapshot.keyAt(i);
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bytesWritten += sizeof(FileState) + round_up(name.length());
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fileCount++;
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}
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}
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LOGP("write_snapshot_file fd=%d\n", fd);
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int amt;
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SnapshotHeader header = { MAGIC0, fileCount, MAGIC1, bytesWritten };
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amt = write(fd, &header, sizeof(header));
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if (amt != sizeof(header)) {
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LOGW("write_snapshot_file error writing header %s", strerror(errno));
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return errno;
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}
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for (int i=0; i<N; i++) {
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FileRec r = snapshot.valueAt(i);
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if (!r.deleted) {
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const String8& name = snapshot.keyAt(i);
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int nameLen = r.s.nameLen = name.length();
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amt = write(fd, &r.s, sizeof(FileState));
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if (amt != sizeof(FileState)) {
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LOGW("write_snapshot_file error writing header %s", strerror(errno));
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return 1;
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}
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// filename is not NULL terminated, but it is padded
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amt = write(fd, name.string(), nameLen);
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if (amt != nameLen) {
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LOGW("write_snapshot_file error writing filename %s", strerror(errno));
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return 1;
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}
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int paddingLen = ROUND_UP[nameLen % 4];
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if (paddingLen != 0) {
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int padding = 0xabababab;
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amt = write(fd, &padding, paddingLen);
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if (amt != paddingLen) {
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LOGW("write_snapshot_file error writing %d bytes of filename padding %s",
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paddingLen, strerror(errno));
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return 1;
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}
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}
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}
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}
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return 0;
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}
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static int
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write_delete_file(BackupDataWriter* dataStream, const String8& key)
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{
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LOGP("write_delete_file %s\n", key.string());
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return dataStream->WriteEntityHeader(key, -1);
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}
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static int
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write_update_file(BackupDataWriter* dataStream, int fd, int mode, const String8& key,
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char const* realFilename)
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{
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LOGP("write_update_file %s (%s) : mode 0%o\n", realFilename, key.string(), mode);
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const int bufsize = 4*1024;
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int err;
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int amt;
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int fileSize;
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int bytesLeft;
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file_metadata_v1 metadata;
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char* buf = (char*)malloc(bufsize);
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int crc = crc32(0L, Z_NULL, 0);
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fileSize = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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if (sizeof(metadata) != 16) {
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LOGE("ERROR: metadata block is the wrong size!");
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}
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bytesLeft = fileSize + sizeof(metadata);
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err = dataStream->WriteEntityHeader(key, bytesLeft);
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if (err != 0) {
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free(buf);
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return err;
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}
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// store the file metadata first
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metadata.version = tolel(CURRENT_METADATA_VERSION);
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metadata.mode = tolel(mode);
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metadata.undefined_1 = metadata.undefined_2 = 0;
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err = dataStream->WriteEntityData(&metadata, sizeof(metadata));
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if (err != 0) {
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free(buf);
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return err;
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}
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bytesLeft -= sizeof(metadata); // bytesLeft should == fileSize now
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// now store the file content
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while ((amt = read(fd, buf, bufsize)) != 0 && bytesLeft > 0) {
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bytesLeft -= amt;
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if (bytesLeft < 0) {
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amt += bytesLeft; // Plus a negative is minus. Don't write more than we promised.
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}
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err = dataStream->WriteEntityData(buf, amt);
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if (err != 0) {
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free(buf);
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return err;
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}
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}
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if (bytesLeft != 0) {
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if (bytesLeft > 0) {
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// Pad out the space we promised in the buffer. We can't corrupt the buffer,
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// even though the data we're sending is probably bad.
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memset(buf, 0, bufsize);
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while (bytesLeft > 0) {
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amt = bytesLeft < bufsize ? bytesLeft : bufsize;
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bytesLeft -= amt;
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err = dataStream->WriteEntityData(buf, amt);
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if (err != 0) {
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free(buf);
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return err;
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}
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}
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}
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LOGE("write_update_file size mismatch for %s. expected=%d actual=%d."
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" You aren't doing proper locking!", realFilename, fileSize, fileSize-bytesLeft);
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}
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free(buf);
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return NO_ERROR;
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}
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static int
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write_update_file(BackupDataWriter* dataStream, const String8& key, char const* realFilename)
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{
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int err;
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struct stat st;
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err = stat(realFilename, &st);
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if (err < 0) {
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return errno;
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}
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int fd = open(realFilename, O_RDONLY);
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if (fd == -1) {
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return errno;
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}
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err = write_update_file(dataStream, fd, st.st_mode, key, realFilename);
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close(fd);
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return err;
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}
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static int
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compute_crc32(int fd)
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{
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const int bufsize = 4*1024;
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int amt;
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char* buf = (char*)malloc(bufsize);
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int crc = crc32(0L, Z_NULL, 0);
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lseek(fd, 0, SEEK_SET);
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while ((amt = read(fd, buf, bufsize)) != 0) {
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crc = crc32(crc, (Bytef*)buf, amt);
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}
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free(buf);
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return crc;
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}
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int
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back_up_files(int oldSnapshotFD, BackupDataWriter* dataStream, int newSnapshotFD,
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char const* const* files, char const* const* keys, int fileCount)
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{
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int err;
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KeyedVector<String8,FileState> oldSnapshot;
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KeyedVector<String8,FileRec> newSnapshot;
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if (oldSnapshotFD != -1) {
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err = read_snapshot_file(oldSnapshotFD, &oldSnapshot);
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if (err != 0) {
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// On an error, treat this as a full backup.
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oldSnapshot.clear();
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}
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}
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for (int i=0; i<fileCount; i++) {
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String8 key(keys[i]);
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FileRec r;
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char const* file = files[i];
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r.file = file;
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struct stat st;
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err = stat(file, &st);
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if (err != 0) {
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r.deleted = true;
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} else {
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r.deleted = false;
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r.s.modTime_sec = st.st_mtime;
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r.s.modTime_nsec = 0; // workaround sim breakage
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//r.s.modTime_nsec = st.st_mtime_nsec;
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r.s.mode = st.st_mode;
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r.s.size = st.st_size;
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// we compute the crc32 later down below, when we already have the file open.
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if (newSnapshot.indexOfKey(key) >= 0) {
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LOGP("back_up_files key already in use '%s'", key.string());
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return -1;
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}
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}
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newSnapshot.add(key, r);
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}
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int n = 0;
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int N = oldSnapshot.size();
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int m = 0;
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while (n<N && m<fileCount) {
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const String8& p = oldSnapshot.keyAt(n);
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const String8& q = newSnapshot.keyAt(m);
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FileRec& g = newSnapshot.editValueAt(m);
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int cmp = p.compare(q);
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if (g.deleted || cmp < 0) {
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// file removed
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LOGP("file removed: %s", p.string());
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g.deleted = true; // They didn't mention the file, but we noticed that it's gone.
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dataStream->WriteEntityHeader(p, -1);
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n++;
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}
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else if (cmp > 0) {
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// file added
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LOGP("file added: %s", g.file.string());
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write_update_file(dataStream, q, g.file.string());
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m++;
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}
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else {
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// both files exist, check them
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const FileState& f = oldSnapshot.valueAt(n);
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int fd = open(g.file.string(), O_RDONLY);
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if (fd < 0) {
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// We can't open the file. Don't report it as a delete either. Let the
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// server keep the old version. Maybe they'll be able to deal with it
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// on restore.
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LOGP("Unable to open file %s - skipping", g.file.string());
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} else {
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g.s.crc32 = compute_crc32(fd);
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LOGP("%s", q.string());
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LOGP(" new: modTime=%d,%d mode=%04o size=%-3d crc32=0x%08x",
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f.modTime_sec, f.modTime_nsec, f.mode, f.size, f.crc32);
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LOGP(" old: modTime=%d,%d mode=%04o size=%-3d crc32=0x%08x",
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g.s.modTime_sec, g.s.modTime_nsec, g.s.mode, g.s.size, g.s.crc32);
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if (f.modTime_sec != g.s.modTime_sec || f.modTime_nsec != g.s.modTime_nsec
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|| f.mode != g.s.mode || f.size != g.s.size || f.crc32 != g.s.crc32) {
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write_update_file(dataStream, fd, g.s.mode, p, g.file.string());
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}
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close(fd);
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}
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n++;
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m++;
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}
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}
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// these were deleted
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while (n<N) {
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dataStream->WriteEntityHeader(oldSnapshot.keyAt(n), -1);
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n++;
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}
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// these were added
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while (m<fileCount) {
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const String8& q = newSnapshot.keyAt(m);
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FileRec& g = newSnapshot.editValueAt(m);
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write_update_file(dataStream, q, g.file.string());
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m++;
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}
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err = write_snapshot_file(newSnapshotFD, newSnapshot);
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return 0;
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}
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#define RESTORE_BUF_SIZE (8*1024)
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RestoreHelperBase::RestoreHelperBase()
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{
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m_buf = malloc(RESTORE_BUF_SIZE);
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m_loggedUnknownMetadata = false;
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}
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RestoreHelperBase::~RestoreHelperBase()
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{
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free(m_buf);
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}
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status_t
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RestoreHelperBase::WriteFile(const String8& filename, BackupDataReader* in)
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{
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ssize_t err;
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size_t dataSize;
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String8 key;
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int fd;
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void* buf = m_buf;
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ssize_t amt;
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int mode;
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int crc;
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struct stat st;
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FileRec r;
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err = in->ReadEntityHeader(&key, &dataSize);
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if (err != NO_ERROR) {
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return err;
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}
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// Get the metadata block off the head of the file entity and use that to
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// set up the output file
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file_metadata_v1 metadata;
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amt = in->ReadEntityData(&metadata, sizeof(metadata));
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if (amt != sizeof(metadata)) {
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LOGW("Could not read metadata for %s -- %ld / %s", filename.string(),
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(long)amt, strerror(errno));
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return EIO;
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}
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metadata.version = fromlel(metadata.version);
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metadata.mode = fromlel(metadata.mode);
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if (metadata.version > CURRENT_METADATA_VERSION) {
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if (!m_loggedUnknownMetadata) {
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m_loggedUnknownMetadata = true;
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LOGW("Restoring file with unsupported metadata version %d (currently %d)",
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metadata.version, CURRENT_METADATA_VERSION);
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}
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}
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mode = metadata.mode;
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// Write the file and compute the crc
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crc = crc32(0L, Z_NULL, 0);
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fd = open(filename.string(), O_CREAT|O_RDWR|O_TRUNC, mode);
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if (fd == -1) {
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LOGW("Could not open file %s -- %s", filename.string(), strerror(errno));
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return errno;
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}
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while ((amt = in->ReadEntityData(buf, RESTORE_BUF_SIZE)) > 0) {
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err = write(fd, buf, amt);
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if (err != amt) {
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close(fd);
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LOGW("Error '%s' writing '%s'", strerror(errno), filename.string());
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return errno;
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}
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crc = crc32(crc, (Bytef*)buf, amt);
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}
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close(fd);
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// Record for the snapshot
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err = stat(filename.string(), &st);
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if (err != 0) {
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LOGW("Error stating file that we just created %s", filename.string());
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return errno;
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}
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r.file = filename;
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r.deleted = false;
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r.s.modTime_sec = st.st_mtime;
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r.s.modTime_nsec = 0; // workaround sim breakage
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//r.s.modTime_nsec = st.st_mtime_nsec;
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r.s.mode = st.st_mode;
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r.s.size = st.st_size;
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r.s.crc32 = crc;
|
|
|
|
m_files.add(key, r);
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
status_t
|
|
RestoreHelperBase::WriteSnapshot(int fd)
|
|
{
|
|
return write_snapshot_file(fd, m_files);;
|
|
}
|
|
|
|
#if TEST_BACKUP_HELPERS
|
|
|
|
#define SCRATCH_DIR "/data/backup_helper_test/"
|
|
|
|
static int
|
|
write_text_file(const char* path, const char* data)
|
|
{
|
|
int amt;
|
|
int fd;
|
|
int len;
|
|
|
|
fd = creat(path, 0666);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "creat %s failed\n", path);
|
|
return errno;
|
|
}
|
|
|
|
len = strlen(data);
|
|
amt = write(fd, data, len);
|
|
if (amt != len) {
|
|
fprintf(stderr, "error (%s) writing to file %s\n", strerror(errno), path);
|
|
return errno;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
compare_file(const char* path, const unsigned char* data, int len)
|
|
{
|
|
int fd;
|
|
int amt;
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "compare_file error (%s) opening %s\n", strerror(errno), path);
|
|
return errno;
|
|
}
|
|
|
|
unsigned char* contents = (unsigned char*)malloc(len);
|
|
if (contents == NULL) {
|
|
fprintf(stderr, "malloc(%d) failed\n", len);
|
|
return ENOMEM;
|
|
}
|
|
|
|
bool sizesMatch = true;
|
|
amt = lseek(fd, 0, SEEK_END);
|
|
if (amt != len) {
|
|
fprintf(stderr, "compare_file file length should be %d, was %d\n", len, amt);
|
|
sizesMatch = false;
|
|
}
|
|
lseek(fd, 0, SEEK_SET);
|
|
|
|
int readLen = amt < len ? amt : len;
|
|
amt = read(fd, contents, readLen);
|
|
if (amt != readLen) {
|
|
fprintf(stderr, "compare_file read expected %d bytes but got %d\n", len, amt);
|
|
}
|
|
|
|
bool contentsMatch = true;
|
|
for (int i=0; i<readLen; i++) {
|
|
if (data[i] != contents[i]) {
|
|
if (contentsMatch) {
|
|
fprintf(stderr, "compare_file contents are different: (index, expected, actual)\n");
|
|
contentsMatch = false;
|
|
}
|
|
fprintf(stderr, " [%-2d] %02x %02x\n", i, data[i], contents[i]);
|
|
}
|
|
}
|
|
|
|
free(contents);
|
|
return contentsMatch && sizesMatch ? 0 : 1;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_empty()
|
|
{
|
|
int err;
|
|
int fd;
|
|
KeyedVector<String8,FileRec> snapshot;
|
|
const char* filename = SCRATCH_DIR "backup_helper_test_empty.snap";
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
|
|
// write
|
|
fd = creat(filename, 0666);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error creating %s\n", filename);
|
|
return 1;
|
|
}
|
|
|
|
err = write_snapshot_file(fd, snapshot);
|
|
|
|
close(fd);
|
|
|
|
if (err != 0) {
|
|
fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
|
|
return err;
|
|
}
|
|
|
|
static const unsigned char correct_data[] = {
|
|
0x53, 0x6e, 0x61, 0x70, 0x00, 0x00, 0x00, 0x00,
|
|
0x46, 0x69, 0x6c, 0x65, 0x10, 0x00, 0x00, 0x00
|
|
};
|
|
|
|
err = compare_file(filename, correct_data, sizeof(correct_data));
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
// read
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error opening for read %s\n", filename);
|
|
return 1;
|
|
}
|
|
|
|
KeyedVector<String8,FileState> readSnapshot;
|
|
err = read_snapshot_file(fd, &readSnapshot);
|
|
if (err != 0) {
|
|
fprintf(stderr, "read_snapshot_file failed %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (readSnapshot.size() != 0) {
|
|
fprintf(stderr, "readSnapshot should be length 0\n");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_four()
|
|
{
|
|
int err;
|
|
int fd;
|
|
KeyedVector<String8,FileRec> snapshot;
|
|
const char* filename = SCRATCH_DIR "backup_helper_test_four.snap";
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
|
|
// write
|
|
fd = creat(filename, 0666);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error opening %s\n", filename);
|
|
return 1;
|
|
}
|
|
|
|
String8 filenames[4];
|
|
FileState states[4];
|
|
FileRec r;
|
|
r.deleted = false;
|
|
|
|
states[0].modTime_sec = 0xfedcba98;
|
|
states[0].modTime_nsec = 0xdeadbeef;
|
|
states[0].mode = 0777; // decimal 511, hex 0x000001ff
|
|
states[0].size = 0xababbcbc;
|
|
states[0].crc32 = 0x12345678;
|
|
states[0].nameLen = -12;
|
|
r.s = states[0];
|
|
filenames[0] = String8("bytes_of_padding");
|
|
snapshot.add(filenames[0], r);
|
|
|
|
states[1].modTime_sec = 0x93400031;
|
|
states[1].modTime_nsec = 0xdeadbeef;
|
|
states[1].mode = 0666; // decimal 438, hex 0x000001b6
|
|
states[1].size = 0x88557766;
|
|
states[1].crc32 = 0x22334422;
|
|
states[1].nameLen = -1;
|
|
r.s = states[1];
|
|
filenames[1] = String8("bytes_of_padding3");
|
|
snapshot.add(filenames[1], r);
|
|
|
|
states[2].modTime_sec = 0x33221144;
|
|
states[2].modTime_nsec = 0xdeadbeef;
|
|
states[2].mode = 0744; // decimal 484, hex 0x000001e4
|
|
states[2].size = 0x11223344;
|
|
states[2].crc32 = 0x01122334;
|
|
states[2].nameLen = 0;
|
|
r.s = states[2];
|
|
filenames[2] = String8("bytes_of_padding_2");
|
|
snapshot.add(filenames[2], r);
|
|
|
|
states[3].modTime_sec = 0x33221144;
|
|
states[3].modTime_nsec = 0xdeadbeef;
|
|
states[3].mode = 0755; // decimal 493, hex 0x000001ed
|
|
states[3].size = 0x11223344;
|
|
states[3].crc32 = 0x01122334;
|
|
states[3].nameLen = 0;
|
|
r.s = states[3];
|
|
filenames[3] = String8("bytes_of_padding__1");
|
|
snapshot.add(filenames[3], r);
|
|
|
|
err = write_snapshot_file(fd, snapshot);
|
|
|
|
close(fd);
|
|
|
|
if (err != 0) {
|
|
fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
|
|
return err;
|
|
}
|
|
|
|
static const unsigned char correct_data[] = {
|
|
// header
|
|
0x53, 0x6e, 0x61, 0x70, 0x04, 0x00, 0x00, 0x00,
|
|
0x46, 0x69, 0x6c, 0x65, 0xbc, 0x00, 0x00, 0x00,
|
|
|
|
// bytes_of_padding
|
|
0x98, 0xba, 0xdc, 0xfe, 0xef, 0xbe, 0xad, 0xde,
|
|
0xff, 0x01, 0x00, 0x00, 0xbc, 0xbc, 0xab, 0xab,
|
|
0x78, 0x56, 0x34, 0x12, 0x10, 0x00, 0x00, 0x00,
|
|
0x62, 0x79, 0x74, 0x65, 0x73, 0x5f, 0x6f, 0x66,
|
|
0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67,
|
|
|
|
// bytes_of_padding3
|
|
0x31, 0x00, 0x40, 0x93, 0xef, 0xbe, 0xad, 0xde,
|
|
0xb6, 0x01, 0x00, 0x00, 0x66, 0x77, 0x55, 0x88,
|
|
0x22, 0x44, 0x33, 0x22, 0x11, 0x00, 0x00, 0x00,
|
|
0x62, 0x79, 0x74, 0x65, 0x73, 0x5f, 0x6f, 0x66,
|
|
0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67,
|
|
0x33, 0xab, 0xab, 0xab,
|
|
|
|
// bytes of padding2
|
|
0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde,
|
|
0xe4, 0x01, 0x00, 0x00, 0x44, 0x33, 0x22, 0x11,
|
|
0x34, 0x23, 0x12, 0x01, 0x12, 0x00, 0x00, 0x00,
|
|
0x62, 0x79, 0x74, 0x65, 0x73, 0x5f, 0x6f, 0x66,
|
|
0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67,
|
|
0x5f, 0x32, 0xab, 0xab,
|
|
|
|
// bytes of padding3
|
|
0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde,
|
|
0xed, 0x01, 0x00, 0x00, 0x44, 0x33, 0x22, 0x11,
|
|
0x34, 0x23, 0x12, 0x01, 0x13, 0x00, 0x00, 0x00,
|
|
0x62, 0x79, 0x74, 0x65, 0x73, 0x5f, 0x6f, 0x66,
|
|
0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67,
|
|
0x5f, 0x5f, 0x31, 0xab
|
|
};
|
|
|
|
err = compare_file(filename, correct_data, sizeof(correct_data));
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
// read
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error opening for read %s\n", filename);
|
|
return 1;
|
|
}
|
|
|
|
|
|
KeyedVector<String8,FileState> readSnapshot;
|
|
err = read_snapshot_file(fd, &readSnapshot);
|
|
if (err != 0) {
|
|
fprintf(stderr, "read_snapshot_file failed %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (readSnapshot.size() != 4) {
|
|
fprintf(stderr, "readSnapshot should be length 4 is %d\n", readSnapshot.size());
|
|
return 1;
|
|
}
|
|
|
|
bool matched = true;
|
|
for (size_t i=0; i<readSnapshot.size(); i++) {
|
|
const String8& name = readSnapshot.keyAt(i);
|
|
const FileState state = readSnapshot.valueAt(i);
|
|
|
|
if (name != filenames[i] || states[i].modTime_sec != state.modTime_sec
|
|
|| states[i].modTime_nsec != state.modTime_nsec || states[i].mode != state.mode
|
|
|| states[i].size != state.size || states[i].crc32 != states[i].crc32) {
|
|
fprintf(stderr, "state %d expected={%d/%d, 0x%08x, %04o, 0x%08x, %3d} '%s'\n"
|
|
" actual={%d/%d, 0x%08x, %04o, 0x%08x, %3d} '%s'\n", i,
|
|
states[i].modTime_sec, states[i].modTime_nsec, states[i].mode, states[i].size,
|
|
states[i].crc32, name.length(), filenames[i].string(),
|
|
state.modTime_sec, state.modTime_nsec, state.mode, state.size, state.crc32,
|
|
state.nameLen, name.string());
|
|
matched = false;
|
|
}
|
|
}
|
|
|
|
return matched ? 0 : 1;
|
|
}
|
|
|
|
// hexdump -v -e '" " 8/1 " 0x%02x," "\n"' data_writer.data
|
|
const unsigned char DATA_GOLDEN_FILE[] = {
|
|
0x44, 0x61, 0x74, 0x61, 0x0b, 0x00, 0x00, 0x00,
|
|
0x0c, 0x00, 0x00, 0x00, 0x6e, 0x6f, 0x5f, 0x70,
|
|
0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x5f, 0x00,
|
|
0x6e, 0x6f, 0x5f, 0x70, 0x61, 0x64, 0x64, 0x69,
|
|
0x6e, 0x67, 0x5f, 0x00, 0x44, 0x61, 0x74, 0x61,
|
|
0x0c, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x00, 0x00,
|
|
0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
|
|
0x6f, 0x5f, 0x5f, 0x33, 0x00, 0xbc, 0xbc, 0xbc,
|
|
0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
|
|
0x6f, 0x5f, 0x5f, 0x33, 0x00, 0xbc, 0xbc, 0xbc,
|
|
0x44, 0x61, 0x74, 0x61, 0x0d, 0x00, 0x00, 0x00,
|
|
0x0e, 0x00, 0x00, 0x00, 0x70, 0x61, 0x64, 0x64,
|
|
0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x32, 0x5f,
|
|
0x5f, 0x00, 0xbc, 0xbc, 0x70, 0x61, 0x64, 0x64,
|
|
0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x32, 0x5f,
|
|
0x5f, 0x00, 0xbc, 0xbc, 0x44, 0x61, 0x74, 0x61,
|
|
0x0a, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00,
|
|
0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74,
|
|
0x6f, 0x31, 0x00, 0xbc, 0x70, 0x61, 0x64, 0x64,
|
|
0x65, 0x64, 0x5f, 0x74, 0x6f, 0x31, 0x00
|
|
|
|
};
|
|
const int DATA_GOLDEN_FILE_SIZE = sizeof(DATA_GOLDEN_FILE);
|
|
|
|
static int
|
|
test_write_header_and_entity(BackupDataWriter& writer, const char* str)
|
|
{
|
|
int err;
|
|
String8 text(str);
|
|
|
|
err = writer.WriteEntityHeader(text, text.length()+1);
|
|
if (err != 0) {
|
|
fprintf(stderr, "WriteEntityHeader failed with %s\n", strerror(err));
|
|
return err;
|
|
}
|
|
|
|
err = writer.WriteEntityData(text.string(), text.length()+1);
|
|
if (err != 0) {
|
|
fprintf(stderr, "write failed for data '%s'\n", text.string());
|
|
return errno;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_data_writer()
|
|
{
|
|
int err;
|
|
int fd;
|
|
const char* filename = SCRATCH_DIR "data_writer.data";
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
mkdir(SCRATCH_DIR "data", 0777);
|
|
|
|
fd = creat(filename, 0666);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
BackupDataWriter writer(fd);
|
|
|
|
err = 0;
|
|
err |= test_write_header_and_entity(writer, "no_padding_");
|
|
err |= test_write_header_and_entity(writer, "padded_to__3");
|
|
err |= test_write_header_and_entity(writer, "padded_to_2__");
|
|
err |= test_write_header_and_entity(writer, "padded_to1");
|
|
|
|
close(fd);
|
|
|
|
err = compare_file(filename, DATA_GOLDEN_FILE, DATA_GOLDEN_FILE_SIZE);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int
|
|
test_read_header_and_entity(BackupDataReader& reader, const char* str)
|
|
{
|
|
int err;
|
|
int bufSize = strlen(str)+1;
|
|
char* buf = (char*)malloc(bufSize);
|
|
String8 string;
|
|
int cookie = 0x11111111;
|
|
size_t actualSize;
|
|
bool done;
|
|
int type;
|
|
ssize_t nRead;
|
|
|
|
// printf("\n\n---------- test_read_header_and_entity -- %s\n\n", str);
|
|
|
|
err = reader.ReadNextHeader(&done, &type);
|
|
if (done) {
|
|
fprintf(stderr, "should not be done yet\n");
|
|
goto finished;
|
|
}
|
|
if (err != 0) {
|
|
fprintf(stderr, "ReadNextHeader (for app header) failed with %s\n", strerror(err));
|
|
goto finished;
|
|
}
|
|
if (type != BACKUP_HEADER_ENTITY_V1) {
|
|
err = EINVAL;
|
|
fprintf(stderr, "type=0x%08x expected 0x%08x\n", type, BACKUP_HEADER_ENTITY_V1);
|
|
}
|
|
|
|
err = reader.ReadEntityHeader(&string, &actualSize);
|
|
if (err != 0) {
|
|
fprintf(stderr, "ReadEntityHeader failed with %s\n", strerror(err));
|
|
goto finished;
|
|
}
|
|
if (string != str) {
|
|
fprintf(stderr, "ReadEntityHeader expected key '%s' got '%s'\n", str, string.string());
|
|
err = EINVAL;
|
|
goto finished;
|
|
}
|
|
if ((int)actualSize != bufSize) {
|
|
fprintf(stderr, "ReadEntityHeader expected dataSize 0x%08x got 0x%08x\n", bufSize,
|
|
actualSize);
|
|
err = EINVAL;
|
|
goto finished;
|
|
}
|
|
|
|
nRead = reader.ReadEntityData(buf, bufSize);
|
|
if (nRead < 0) {
|
|
err = reader.Status();
|
|
fprintf(stderr, "ReadEntityData failed with %s\n", strerror(err));
|
|
goto finished;
|
|
}
|
|
|
|
if (0 != memcmp(buf, str, bufSize)) {
|
|
fprintf(stderr, "ReadEntityData expected '%s' but got something starting with "
|
|
"%02x %02x %02x %02x '%c%c%c%c'\n", str, buf[0], buf[1], buf[2], buf[3],
|
|
buf[0], buf[1], buf[2], buf[3]);
|
|
err = EINVAL;
|
|
goto finished;
|
|
}
|
|
|
|
// The next read will confirm whether it got the right amount of data.
|
|
|
|
finished:
|
|
if (err != NO_ERROR) {
|
|
fprintf(stderr, "test_read_header_and_entity failed with %s\n", strerror(err));
|
|
}
|
|
free(buf);
|
|
return err;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_data_reader()
|
|
{
|
|
int err;
|
|
int fd;
|
|
const char* filename = SCRATCH_DIR "data_reader.data";
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
mkdir(SCRATCH_DIR "data", 0777);
|
|
|
|
fd = creat(filename, 0666);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
err = write(fd, DATA_GOLDEN_FILE, DATA_GOLDEN_FILE_SIZE);
|
|
if (err != DATA_GOLDEN_FILE_SIZE) {
|
|
fprintf(stderr, "Error \"%s\" writing golden file %s\n", strerror(errno), filename);
|
|
return errno;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "Error \"%s\" opening golden file %s for read\n", strerror(errno),
|
|
filename);
|
|
return errno;
|
|
}
|
|
|
|
{
|
|
BackupDataReader reader(fd);
|
|
|
|
err = 0;
|
|
|
|
if (err == NO_ERROR) {
|
|
err = test_read_header_and_entity(reader, "no_padding_");
|
|
}
|
|
|
|
if (err == NO_ERROR) {
|
|
err = test_read_header_and_entity(reader, "padded_to__3");
|
|
}
|
|
|
|
if (err == NO_ERROR) {
|
|
err = test_read_header_and_entity(reader, "padded_to_2__");
|
|
}
|
|
|
|
if (err == NO_ERROR) {
|
|
err = test_read_header_and_entity(reader, "padded_to1");
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
get_mod_time(const char* filename, struct timeval times[2])
|
|
{
|
|
int err;
|
|
struct stat64 st;
|
|
err = stat64(filename, &st);
|
|
if (err != 0) {
|
|
fprintf(stderr, "stat '%s' failed: %s\n", filename, strerror(errno));
|
|
return errno;
|
|
}
|
|
times[0].tv_sec = st.st_atime;
|
|
times[1].tv_sec = st.st_mtime;
|
|
|
|
// If st_atime is a macro then struct stat64 uses struct timespec
|
|
// to store the access and modif time values and typically
|
|
// st_*time_nsec is not defined. In glibc, this is controlled by
|
|
// __USE_MISC.
|
|
#ifdef __USE_MISC
|
|
#if !defined(st_atime) || defined(st_atime_nsec)
|
|
#error "Check if this __USE_MISC conditional is still needed."
|
|
#endif
|
|
times[0].tv_usec = st.st_atim.tv_nsec / 1000;
|
|
times[1].tv_usec = st.st_mtim.tv_nsec / 1000;
|
|
#else
|
|
times[0].tv_usec = st.st_atime_nsec / 1000;
|
|
times[1].tv_usec = st.st_mtime_nsec / 1000;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_files()
|
|
{
|
|
int err;
|
|
int oldSnapshotFD;
|
|
int dataStreamFD;
|
|
int newSnapshotFD;
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
mkdir(SCRATCH_DIR "data", 0777);
|
|
|
|
write_text_file(SCRATCH_DIR "data/b", "b\nbb\n");
|
|
write_text_file(SCRATCH_DIR "data/c", "c\ncc\n");
|
|
write_text_file(SCRATCH_DIR "data/d", "d\ndd\n");
|
|
write_text_file(SCRATCH_DIR "data/e", "e\nee\n");
|
|
write_text_file(SCRATCH_DIR "data/f", "f\nff\n");
|
|
write_text_file(SCRATCH_DIR "data/h", "h\nhh\n");
|
|
|
|
char const* files_before[] = {
|
|
SCRATCH_DIR "data/b",
|
|
SCRATCH_DIR "data/c",
|
|
SCRATCH_DIR "data/d",
|
|
SCRATCH_DIR "data/e",
|
|
SCRATCH_DIR "data/f"
|
|
};
|
|
|
|
char const* keys_before[] = {
|
|
"data/b",
|
|
"data/c",
|
|
"data/d",
|
|
"data/e",
|
|
"data/f"
|
|
};
|
|
|
|
dataStreamFD = creat(SCRATCH_DIR "1.data", 0666);
|
|
if (dataStreamFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "before.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
{
|
|
BackupDataWriter dataStream(dataStreamFD);
|
|
|
|
err = back_up_files(-1, &dataStream, newSnapshotFD, files_before, keys_before, 5);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
close(dataStreamFD);
|
|
close(newSnapshotFD);
|
|
|
|
sleep(3);
|
|
|
|
struct timeval d_times[2];
|
|
struct timeval e_times[2];
|
|
|
|
err = get_mod_time(SCRATCH_DIR "data/d", d_times);
|
|
err |= get_mod_time(SCRATCH_DIR "data/e", e_times);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
write_text_file(SCRATCH_DIR "data/a", "a\naa\n");
|
|
unlink(SCRATCH_DIR "data/c");
|
|
write_text_file(SCRATCH_DIR "data/c", "c\ncc\n");
|
|
write_text_file(SCRATCH_DIR "data/d", "dd\ndd\n");
|
|
utimes(SCRATCH_DIR "data/d", d_times);
|
|
write_text_file(SCRATCH_DIR "data/e", "z\nzz\n");
|
|
utimes(SCRATCH_DIR "data/e", e_times);
|
|
write_text_file(SCRATCH_DIR "data/g", "g\ngg\n");
|
|
unlink(SCRATCH_DIR "data/f");
|
|
|
|
char const* files_after[] = {
|
|
SCRATCH_DIR "data/a", // added
|
|
SCRATCH_DIR "data/b", // same
|
|
SCRATCH_DIR "data/c", // different mod time
|
|
SCRATCH_DIR "data/d", // different size (same mod time)
|
|
SCRATCH_DIR "data/e", // different contents (same mod time, same size)
|
|
SCRATCH_DIR "data/g" // added
|
|
};
|
|
|
|
char const* keys_after[] = {
|
|
"data/a", // added
|
|
"data/b", // same
|
|
"data/c", // different mod time
|
|
"data/d", // different size (same mod time)
|
|
"data/e", // different contents (same mod time, same size)
|
|
"data/g" // added
|
|
};
|
|
|
|
oldSnapshotFD = open(SCRATCH_DIR "before.snap", O_RDONLY);
|
|
if (oldSnapshotFD == -1) {
|
|
fprintf(stderr, "error opening: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
dataStreamFD = creat(SCRATCH_DIR "2.data", 0666);
|
|
if (dataStreamFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "after.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
{
|
|
BackupDataWriter dataStream(dataStreamFD);
|
|
|
|
err = back_up_files(oldSnapshotFD, &dataStream, newSnapshotFD, files_after, keys_after, 6);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
close(oldSnapshotFD);
|
|
close(dataStreamFD);
|
|
close(newSnapshotFD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_null_base()
|
|
{
|
|
int err;
|
|
int oldSnapshotFD;
|
|
int dataStreamFD;
|
|
int newSnapshotFD;
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
mkdir(SCRATCH_DIR "data", 0777);
|
|
|
|
write_text_file(SCRATCH_DIR "data/a", "a\naa\n");
|
|
|
|
char const* files[] = {
|
|
SCRATCH_DIR "data/a",
|
|
};
|
|
|
|
char const* keys[] = {
|
|
"a",
|
|
};
|
|
|
|
dataStreamFD = creat(SCRATCH_DIR "null_base.data", 0666);
|
|
if (dataStreamFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "null_base.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
{
|
|
BackupDataWriter dataStream(dataStreamFD);
|
|
|
|
err = back_up_files(-1, &dataStream, newSnapshotFD, files, keys, 1);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
close(dataStreamFD);
|
|
close(newSnapshotFD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_missing_file()
|
|
{
|
|
int err;
|
|
int oldSnapshotFD;
|
|
int dataStreamFD;
|
|
int newSnapshotFD;
|
|
|
|
system("rm -r " SCRATCH_DIR);
|
|
mkdir(SCRATCH_DIR, 0777);
|
|
mkdir(SCRATCH_DIR "data", 0777);
|
|
|
|
write_text_file(SCRATCH_DIR "data/b", "b\nbb\n");
|
|
|
|
char const* files[] = {
|
|
SCRATCH_DIR "data/a",
|
|
SCRATCH_DIR "data/b",
|
|
SCRATCH_DIR "data/c",
|
|
};
|
|
|
|
char const* keys[] = {
|
|
"a",
|
|
"b",
|
|
"c",
|
|
};
|
|
|
|
dataStreamFD = creat(SCRATCH_DIR "null_base.data", 0666);
|
|
if (dataStreamFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "null_base.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
{
|
|
BackupDataWriter dataStream(dataStreamFD);
|
|
|
|
err = back_up_files(-1, &dataStream, newSnapshotFD, files, keys, 1);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
close(dataStreamFD);
|
|
close(newSnapshotFD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#endif // TEST_BACKUP_HELPERS
|
|
|
|
}
|