5c2882b25c
This change adds a fixed-size metadata block at the head of each file's content entity. The block is versioned, and fixed-size on the theory that it might be nice to be able to recover the content (if not the full metadata) of the files if we're ever confronted with data backed up some hypothetical future helper that stored expanded metadata. The net effect is that now on restore, we assign the same access mode to the file that it originally had when backed up. Also, some of the code was failing to properly free transient heap-based buffers when it encountered errors. This has been fixed with the addition of a tiny stack-based object whose job it is to free() its designated pointer from its destructor.
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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// auto-free buffer management object
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class StAutoFree {
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public:
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StAutoFree(void* buffer) { mBuf = buffer; }
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~StAutoFree() { free(mBuf); }
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private:
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void* mBuf;
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};
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#if 0 // 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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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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StAutoFree _autoFree(buf);
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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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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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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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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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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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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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StAutoFree _autoFree(buf);
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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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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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LOGW("Error stating file %s", file);
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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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}
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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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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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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;
|
|
r.deleted = false;
|
|
r.s.modTime_sec = st.st_mtime;
|
|
r.s.modTime_nsec = 0; // workaround sim breakage
|
|
//r.s.modTime_nsec = st.st_mtime_nsec;
|
|
r.s.mode = st.st_mode;
|
|
r.s.size = st.st_size;
|
|
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;
|
|
}
|
|
StAutoFree _autoFree(contents);
|
|
|
|
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]);
|
|
}
|
|
}
|
|
|
|
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);
|
|
StAutoFree _autoFree(buf);
|
|
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));
|
|
}
|
|
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
|
|
|
|
}
|