683 lines
18 KiB
C++
683 lines
18 KiB
C++
#define LOG_TAG "file_backup_helper"
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#include <utils/backup_helpers.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 <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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using namespace android;
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#define MAGIC0 0x70616e53 // Snap
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#define MAGIC1 0x656c6946 // File
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struct SnapshotHeader {
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int magic0;
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int fileCount;
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int magic1;
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int totalSize;
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};
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struct FileState {
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int modTime_sec;
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int modTime_nsec;
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int size;
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int crc32;
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int nameLen;
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};
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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(file));
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if (amt != sizeof(file)) {
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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,FileState>& snapshot)
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{
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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 String8& name = snapshot.keyAt(i);
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bytesWritten += sizeof(FileState) + round_up(name.length());
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}
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int amt;
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SnapshotHeader header = { MAGIC0, N, 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<header.fileCount; i++) {
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const String8& name = snapshot.keyAt(i);
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FileState file = snapshot.valueAt(i);
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int nameLen = file.nameLen = name.length();
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amt = write(fd, &file, sizeof(file));
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if (amt != sizeof(file)) {
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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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return 0;
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}
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static int
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write_delete_file(const String8& key)
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{
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printf("write_delete_file %s\n", key.string());
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return 0;
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}
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static int
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write_update_file(const String8& realFilename, const String8& key)
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{
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printf("write_update_file %s (%s)\n", realFilename.string(), key.string());
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return 0;
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}
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static int
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compute_crc32(const String8& filename)
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{
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const int bufsize = 4*1024;
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int amt;
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int fd = open(filename.string(), O_RDONLY);
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if (fd == -1) {
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return -1;
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}
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char* buf = (char*)malloc(bufsize);
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int crc = crc32(0L, Z_NULL, 0);
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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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close(fd);
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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, int newSnapshotFD, int oldDataStream,
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char const* fileBase, char const* const* files, int fileCount)
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{
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int err;
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const String8 base(fileBase);
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KeyedVector<String8,FileState> oldSnapshot;
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KeyedVector<String8,FileState> 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 name(files[i]);
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FileState s;
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struct stat st;
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String8 realFilename(base);
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realFilename.appendPath(name);
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err = stat(realFilename.string(), &st);
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if (err != 0) {
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LOGW("Error stating file %s", realFilename.string());
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continue;
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}
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s.modTime_sec = st.st_mtime;
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s.modTime_nsec = 0; // workaround sim breakage
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//s.modTime_nsec = st.st_mtime_nsec;
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s.size = st.st_size;
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s.crc32 = compute_crc32(realFilename);
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newSnapshot.add(name, s);
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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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int cmp = p.compare(q);
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if (cmp > 0) {
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// file added
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String8 realFilename(base);
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realFilename.appendPath(q);
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write_update_file(realFilename, q);
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m++;
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}
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else if (cmp < 0) {
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// file removed
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write_delete_file(p);
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n++;
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}
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else {
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// both files exist, check them
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String8 realFilename(base);
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realFilename.appendPath(q);
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const FileState& f = oldSnapshot.valueAt(n);
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const FileState& g = newSnapshot.valueAt(m);
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printf("%s\n", q.string());
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printf(" new: modTime=%d,%d size=%-3d crc32=0x%08x\n",
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f.modTime_sec, f.modTime_nsec, f.size, f.crc32);
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printf(" old: modTime=%d,%d size=%-3d crc32=0x%08x\n",
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g.modTime_sec, g.modTime_nsec, g.size, g.crc32);
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if (f.modTime_sec != g.modTime_sec || f.modTime_nsec != g.modTime_nsec
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|| f.size != g.size || f.crc32 != g.crc32) {
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write_update_file(realFilename, p);
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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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write_delete_file(oldSnapshot.keyAt(n));
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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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String8 realFilename(base);
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realFilename.appendPath(q);
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write_update_file(realFilename, q);
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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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#if TEST_BACKUP_HELPERS
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#define SCRATCH_DIR "/data/backup_helper_test/"
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static int
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write_text_file(const char* path, const char* data)
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{
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int amt;
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int fd;
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int len;
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fd = creat(path, 0666);
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if (fd == -1) {
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fprintf(stderr, "creat %s failed\n", path);
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return errno;
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}
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len = strlen(data);
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amt = write(fd, data, len);
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if (amt != len) {
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fprintf(stderr, "error (%s) writing to file %s\n", strerror(errno), path);
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return errno;
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}
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close(fd);
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return 0;
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}
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static int
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compare_file(const char* path, const unsigned char* data, int len)
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{
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int fd;
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int amt;
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fd = open(path, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "compare_file error (%s) opening %s\n", strerror(errno), path);
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return errno;
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}
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unsigned char* contents = (unsigned char*)malloc(len);
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if (contents == NULL) {
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fprintf(stderr, "malloc(%d) failed\n", len);
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return ENOMEM;
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}
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bool sizesMatch = true;
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amt = lseek(fd, 0, SEEK_END);
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if (amt != len) {
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fprintf(stderr, "compare_file file length should be %d, was %d\n", len, amt);
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sizesMatch = false;
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}
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lseek(fd, 0, SEEK_SET);
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int readLen = amt < len ? amt : len;
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amt = read(fd, contents, readLen);
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if (amt != readLen) {
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fprintf(stderr, "compare_file read expected %d bytes but got %d\n", len, amt);
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}
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bool contentsMatch = true;
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for (int i=0; i<readLen; i++) {
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if (data[i] != contents[i]) {
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if (contentsMatch) {
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fprintf(stderr, "compare_file contents are different: (index, expected, actual)\n");
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contentsMatch = false;
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}
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fprintf(stderr, " [%-2d] %02x %02x\n", i, data[i], contents[i]);
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}
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}
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return contentsMatch && sizesMatch ? 0 : 1;
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}
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int
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backup_helper_test_empty()
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{
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int err;
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int fd;
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KeyedVector<String8,FileState> snapshot;
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const char* filename = SCRATCH_DIR "backup_helper_test_empty.snap";
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system("rm -r " SCRATCH_DIR);
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mkdir(SCRATCH_DIR, 0777);
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// write
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fd = creat(filename, 0666);
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if (fd == -1) {
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fprintf(stderr, "error creating %s\n", filename);
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return 1;
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}
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err = write_snapshot_file(fd, snapshot);
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close(fd);
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if (err != 0) {
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fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
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return err;
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}
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static const unsigned char correct_data[] = {
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0x53, 0x6e, 0x61, 0x70, 0x00, 0x00, 0x00, 0x00,
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0x46, 0x69, 0x6c, 0x65, 0x10, 0x00, 0x00, 0x00
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};
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err = compare_file(filename, correct_data, sizeof(correct_data));
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if (err != 0) {
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return err;
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}
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// read
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fd = open(filename, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "error opening for read %s\n", filename);
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return 1;
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}
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KeyedVector<String8,FileState> readSnapshot;
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err = read_snapshot_file(fd, &readSnapshot);
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if (err != 0) {
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fprintf(stderr, "read_snapshot_file failed %d\n", err);
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return err;
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}
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if (readSnapshot.size() != 0) {
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fprintf(stderr, "readSnapshot should be length 0\n");
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return 1;
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}
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return 0;
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}
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int
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backup_helper_test_four()
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{
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int err;
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int fd;
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KeyedVector<String8,FileState> snapshot;
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const char* filename = SCRATCH_DIR "backup_helper_test_four.snap";
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system("rm -r " SCRATCH_DIR);
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mkdir(SCRATCH_DIR, 0777);
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// write
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fd = creat(filename, 0666);
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if (fd == -1) {
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fprintf(stderr, "error opening %s\n", filename);
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return 1;
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}
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String8 filenames[4];
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FileState states[4];
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states[0].modTime_sec = 0xfedcba98;
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states[0].modTime_nsec = 0xdeadbeef;
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states[0].size = 0xababbcbc;
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states[0].crc32 = 0x12345678;
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states[0].nameLen = -12;
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filenames[0] = String8("bytes_of_padding");
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snapshot.add(filenames[0], states[0]);
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states[1].modTime_sec = 0x93400031;
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states[1].modTime_nsec = 0xdeadbeef;
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states[1].size = 0x88557766;
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states[1].crc32 = 0x22334422;
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states[1].nameLen = -1;
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filenames[1] = String8("bytes_of_padding3");
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snapshot.add(filenames[1], states[1]);
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states[2].modTime_sec = 0x33221144;
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states[2].modTime_nsec = 0xdeadbeef;
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states[2].size = 0x11223344;
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states[2].crc32 = 0x01122334;
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states[2].nameLen = 0;
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filenames[2] = String8("bytes_of_padding_2");
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snapshot.add(filenames[2], states[2]);
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states[3].modTime_sec = 0x33221144;
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states[3].modTime_nsec = 0xdeadbeef;
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states[3].size = 0x11223344;
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states[3].crc32 = 0x01122334;
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states[3].nameLen = 0;
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filenames[3] = String8("bytes_of_padding__1");
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snapshot.add(filenames[3], states[3]);
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err = write_snapshot_file(fd, snapshot);
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close(fd);
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if (err != 0) {
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fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err));
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return err;
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}
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static const unsigned char correct_data[] = {
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// header
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0x53, 0x6e, 0x61, 0x70, 0x04, 0x00, 0x00, 0x00,
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0x46, 0x69, 0x6c, 0x65, 0xac, 0x00, 0x00, 0x00,
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// bytes_of_padding
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0x98, 0xba, 0xdc, 0xfe, 0xef, 0xbe, 0xad, 0xde,
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0xbc, 0xbc, 0xab, 0xab, 0x78, 0x56, 0x34, 0x12,
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0x10, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65,
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0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64,
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0x64, 0x69, 0x6e, 0x67,
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// bytes_of_padding3
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0x31, 0x00, 0x40, 0x93, 0xef, 0xbe, 0xad, 0xde,
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0x66, 0x77, 0x55, 0x88, 0x22, 0x44, 0x33, 0x22,
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0x11, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65,
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0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64,
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0x64, 0x69, 0x6e, 0x67, 0x33, 0xab, 0xab, 0xab,
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// bytes of padding2
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0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde,
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0x44, 0x33, 0x22, 0x11, 0x34, 0x23, 0x12, 0x01,
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0x12, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65,
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0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64,
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0x64, 0x69, 0x6e, 0x67, 0x5f, 0x32, 0xab, 0xab,
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// bytes of padding3
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0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde,
|
|
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].size != state.size || states[i].crc32 != states[i].crc32) {
|
|
fprintf(stderr, "state %d expected={%d/%d, 0x%08x, 0x%08x, %3d} '%s'\n"
|
|
" actual={%d/%d, 0x%08x, 0x%08x, %3d} '%s'\n", i,
|
|
states[i].modTime_sec, states[i].modTime_nsec, states[i].size, states[i].crc32,
|
|
name.length(), filenames[i].string(),
|
|
state.modTime_sec, state.modTime_nsec, state.size, state.crc32, state.nameLen,
|
|
name.string());
|
|
matched = false;
|
|
}
|
|
}
|
|
|
|
return matched ? 0 : 1;
|
|
}
|
|
|
|
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[0].tv_usec = st.st_atime_nsec / 1000;
|
|
times[1].tv_sec = st.st_mtime;
|
|
times[1].tv_usec = st.st_mtime_nsec / 1000;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
backup_helper_test_files()
|
|
{
|
|
int err;
|
|
int newSnapshotFD;
|
|
int oldSnapshotFD;
|
|
|
|
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[] = {
|
|
"data/b",
|
|
"data/c",
|
|
"data/d",
|
|
"data/e",
|
|
"data/f"
|
|
};
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "before.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
err = back_up_files(-1, newSnapshotFD, 0, SCRATCH_DIR, files_before, 5);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
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[] = {
|
|
"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;
|
|
}
|
|
|
|
newSnapshotFD = creat(SCRATCH_DIR "after.snap", 0666);
|
|
if (newSnapshotFD == -1) {
|
|
fprintf(stderr, "error creating: %s\n", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
err = back_up_files(oldSnapshotFD, newSnapshotFD, 0, SCRATCH_DIR, files_after, 6);
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
close(oldSnapshotFD);
|
|
close(newSnapshotFD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif // TEST_BACKUP_HELPERS
|