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Diffstat (limited to 'lib/backupclient/BackupStoreFile.cpp')
| -rw-r--r-- | lib/backupclient/BackupStoreFile.cpp | 1568 |
1 files changed, 1568 insertions, 0 deletions
diff --git a/lib/backupclient/BackupStoreFile.cpp b/lib/backupclient/BackupStoreFile.cpp new file mode 100644 index 00000000..4609dbc1 --- /dev/null +++ b/lib/backupclient/BackupStoreFile.cpp @@ -0,0 +1,1568 @@ +// distribution boxbackup-0.10 (svn version: 494) +// +// Copyright (c) 2003 - 2006 +// Ben Summers and contributors. All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// 1. Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// 2. Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// 3. All use of this software and associated advertising materials must +// display the following acknowledgment: +// This product includes software developed by Ben Summers. +// 4. The names of the Authors may not be used to endorse or promote +// products derived from this software without specific prior written +// permission. +// +// [Where legally impermissible the Authors do not disclaim liability for +// direct physical injury or death caused solely by defects in the software +// unless it is modified by a third party.] +// +// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR +// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, +// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +// POSSIBILITY OF SUCH DAMAGE. +// +// +// +// -------------------------------------------------------------------------- +// +// File +// Name: BackupStoreFile.cpp +// Purpose: Utils for manipulating files +// Created: 2003/08/28 +// +// -------------------------------------------------------------------------- + +#include "Box.h" + +#ifdef HAVE_UNISTD_H + #include <unistd.h> +#endif + +#include <sys/stat.h> +#include <string.h> +#include <new> +#include <string.h> +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + #ifndef WIN32 + #include <syslog.h> + #endif + #include <stdio.h> +#endif + +#include "BackupStoreFile.h" +#include "BackupStoreFileWire.h" +#include "BackupStoreFileCryptVar.h" +#include "BackupStoreFilename.h" +#include "BackupStoreException.h" +#include "IOStream.h" +#include "Guards.h" +#include "FileModificationTime.h" +#include "FileStream.h" +#include "BackupClientFileAttributes.h" +#include "BackupStoreObjectMagic.h" +#include "Compress.h" +#include "CipherContext.h" +#include "CipherBlowfish.h" +#include "CipherAES.h" +#include "BackupStoreConstants.h" +#include "CollectInBufferStream.h" +#include "RollingChecksum.h" +#include "MD5Digest.h" +#include "ReadGatherStream.h" +#include "Random.h" +#include "BackupStoreFileEncodeStream.h" + +#include "MemLeakFindOn.h" + +using namespace BackupStoreFileCryptVar; + +// How big a buffer to use for copying files +#define COPY_BUFFER_SIZE (8*1024) + +// Statistics +BackupStoreFileStats BackupStoreFile::msStats = {0,0,0}; + +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + bool sWarnedAboutBackwardsCompatiblity = false; +#endif + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodeFile(IOStream &, IOStream &) +// Purpose: Encode a file into something for storing on file server. +// Requires a real filename so full info can be stored. +// +// Returns a stream. Most of the work is done by the stream +// when data is actually requested -- the file will be held +// open until the stream is deleted or the file finished. +// Created: 2003/08/28 +// +// -------------------------------------------------------------------------- +std::auto_ptr<IOStream> BackupStoreFile::EncodeFile(const char *Filename, int64_t ContainerID, const BackupStoreFilename &rStoreFilename, int64_t *pModificationTime) +{ + // Create the stream + std::auto_ptr<IOStream> stream(new BackupStoreFileEncodeStream); + + // Do the initial setup + ((BackupStoreFileEncodeStream*)stream.get())->Setup(Filename, 0 /* no recipe, just encode */, + ContainerID, rStoreFilename, pModificationTime); + + // Return the stream for the caller + return stream; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::VerifyEncodedFileFormat(IOStream &) +// Purpose: Verify that an encoded file meets the format requirements. +// Doesn't verify that the data is intact and can be decoded. +// Optionally returns the ID of the file which it is diffed from, +// and the (original) container ID. +// Created: 2003/08/28 +// +// -------------------------------------------------------------------------- +bool BackupStoreFile::VerifyEncodedFileFormat(IOStream &rFile, int64_t *pDiffFromObjectIDOut, int64_t *pContainerIDOut) +{ + // Get the size of the file + int64_t fileSize = rFile.BytesLeftToRead(); + if(fileSize == IOStream::SizeOfStreamUnknown) + { + THROW_EXCEPTION(BackupStoreException, StreamDoesntHaveRequiredFeatures) + } + + // Get the header... + file_StreamFormat hdr; + if(!rFile.ReadFullBuffer(&hdr, sizeof(hdr), 0 /* not interested in bytes read if this fails */)) + { + // Couldn't read header + return false; + } + + // Check magic number + if(ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V1 +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V0 +#endif + ) + { + return false; + } + + // Get a filename, see if it loads OK + try + { + BackupStoreFilename fn; + fn.ReadFromStream(rFile, IOStream::TimeOutInfinite); + } + catch(...) + { + // an error occured while reading it, so that's not good + return false; + } + + // Skip the attributes -- because they're encrypted, the server can't tell whether they're OK or not + try + { + int32_t size_s; + if(!rFile.ReadFullBuffer(&size_s, sizeof(size_s), 0 /* not interested in bytes read if this fails */)) + { + THROW_EXCEPTION(CommonException, StreamableMemBlockIncompleteRead) + } + int size = ntohl(size_s); + // Skip forward the size + rFile.Seek(size, IOStream::SeekType_Relative); + } + catch(...) + { + // an error occured while reading it, so that's not good + return false; + } + + // Get current position in file -- the end of the header + int64_t headerEnd = rFile.GetPosition(); + + // Get number of blocks + int64_t numBlocks = box_ntoh64(hdr.mNumBlocks); + + // Calculate where the block index will be, check it's reasonable + int64_t blockIndexLoc = fileSize - ((numBlocks * sizeof(file_BlockIndexEntry)) + sizeof(file_BlockIndexHeader)); + if(blockIndexLoc < headerEnd) + { + // Not enough space left for the block index, let alone the blocks themselves + return false; + } + + // Load the block index header + rFile.Seek(blockIndexLoc, IOStream::SeekType_Absolute); + file_BlockIndexHeader blkhdr; + if(!rFile.ReadFullBuffer(&blkhdr, sizeof(blkhdr), 0 /* not interested in bytes read if this fails */)) + { + // Couldn't read block index header -- assume bad file + return false; + } + + // Check header + if((ntohl(blkhdr.mMagicValue) != OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V1 +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && ntohl(blkhdr.mMagicValue) != OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V0 +#endif + ) + || (int64_t)box_ntoh64(blkhdr.mNumBlocks) != numBlocks) + { + // Bad header -- either magic value or number of blocks is wrong + return false; + } + + // Flag for recording whether a block is referenced from another file + bool blockFromOtherFileReferenced = false; + + // Read the index, checking that the length values all make sense + int64_t currentBlockStart = headerEnd; + for(int64_t b = 0; b < numBlocks; ++b) + { + // Read block entry + file_BlockIndexEntry blk; + if(!rFile.ReadFullBuffer(&blk, sizeof(blk), 0 /* not interested in bytes read if this fails */)) + { + // Couldn't read block index entry -- assume bad file + return false; + } + + // Check size and location + int64_t blkSize = box_ntoh64(blk.mEncodedSize); + if(blkSize <= 0) + { + // Mark that this file references another file + blockFromOtherFileReferenced = true; + } + else + { + // This block is actually in this file + if((currentBlockStart + blkSize) > blockIndexLoc) + { + // Encoded size makes the block run over the index + return false; + } + + // Move the current block start ot the end of this block + currentBlockStart += blkSize; + } + } + + // Check that there's no empty space + if(currentBlockStart != blockIndexLoc) + { + return false; + } + + // Check that if another block is references, then the ID is there, and if one isn't there is no ID. + int64_t otherID = box_ntoh64(blkhdr.mOtherFileID); + if((otherID != 0 && blockFromOtherFileReferenced == false) + || (otherID == 0 && blockFromOtherFileReferenced == true)) + { + // Doesn't look good! + return false; + } + + // Does the caller want the other ID? + if(pDiffFromObjectIDOut) + { + *pDiffFromObjectIDOut = otherID; + } + + // Does the caller want the container ID? + if(pContainerIDOut) + { + *pContainerIDOut = box_ntoh64(hdr.mContainerID); + } + + // Passes all tests + return true; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodeFile(IOStream &, const char *) +// Purpose: Decode a file. Will set file attributes. File must not exist. +// Created: 2003/08/28 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::DecodeFile(IOStream &rEncodedFile, const char *DecodedFilename, int Timeout, const BackupClientFileAttributes *pAlterativeAttr) +{ + // Does file exist? + struct stat st; + if(::stat(DecodedFilename, &st) == 0) + { + THROW_EXCEPTION(BackupStoreException, OutputFileAlreadyExists) + } + + // Try, delete output file if error + try + { + // Make a stream for outputting this file + FileStream out(DecodedFilename, O_WRONLY | O_CREAT | O_EXCL); + + // Get the decoding stream + std::auto_ptr<DecodedStream> stream(DecodeFileStream(rEncodedFile, Timeout, pAlterativeAttr)); + + // Is it a symlink? + if(!stream->IsSymLink()) + { + // Copy it out to the file + stream->CopyStreamTo(out); + } + + // Write the attributes + stream->GetAttributes().WriteAttributes(DecodedFilename); + } + catch(...) + { + ::unlink(DecodedFilename); + throw; + } +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodeFileStream(IOStream &, int, const BackupClientFileAttributes *) +// Purpose: Return a stream which will decode the encrypted file data on the fly. +// Accepts streams in block index first, or main header first, order. In the latter case, +// the stream must be Seek()able. +// +// Before you use the returned stream, call IsSymLink() -- symlink streams won't allow +// you to read any data to enforce correct logic. See BackupStoreFile::DecodeFile() implementation. +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +std::auto_ptr<BackupStoreFile::DecodedStream> BackupStoreFile::DecodeFileStream(IOStream &rEncodedFile, int Timeout, const BackupClientFileAttributes *pAlterativeAttr) +{ + // Create stream + std::auto_ptr<DecodedStream> stream(new DecodedStream(rEncodedFile, Timeout)); + + // Get it ready + stream->Setup(pAlterativeAttr); + + // Return to caller + return stream; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::DecodedStream(IOStream &, int) +// Purpose: Constructor +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +BackupStoreFile::DecodedStream::DecodedStream(IOStream &rEncodedFile, int Timeout) + : mrEncodedFile(rEncodedFile), + mTimeout(Timeout), + mNumBlocks(0), + mpBlockIndex(0), + mpEncodedData(0), + mpClearData(0), + mClearDataSize(0), + mCurrentBlock(-1), + mCurrentBlockClearSize(0), + mPositionInCurrentBlock(0), + mEntryIVBase(42) // different to default value in the encoded stream! +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + , mIsOldVersion(false) +#endif +{ +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::~DecodedStream() +// Purpose: Desctructor +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +BackupStoreFile::DecodedStream::~DecodedStream() +{ + // Free any allocated memory + if(mpBlockIndex) + { + ::free(mpBlockIndex); + } + if(mpEncodedData) + { + BackupStoreFile::CodingChunkFree(mpEncodedData); + } + if(mpClearData) + { + ::free(mpClearData); + } +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::Setup(const BackupClientFileAttributes *) +// Purpose: Get the stream ready to decode -- reads in headers +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::DecodedStream::Setup(const BackupClientFileAttributes *pAlterativeAttr) +{ + // Get the size of the file + int64_t fileSize = mrEncodedFile.BytesLeftToRead(); + + // Get the magic number to work out which order the stream is in + int32_t magic; + if(!mrEncodedFile.ReadFullBuffer(&magic, sizeof(magic), 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read magic value + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + + bool inFileOrder = true; + switch(ntohl(magic)) + { +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + case OBJECTMAGIC_FILE_MAGIC_VALUE_V0: + mIsOldVersion = true; + // control flows on +#endif + case OBJECTMAGIC_FILE_MAGIC_VALUE_V1: + inFileOrder = true; + break; + +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + case OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V0: + mIsOldVersion = true; + // control flows on +#endif + case OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V1: + inFileOrder = false; + break; + + default: + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // If not in file order, then the index list must be read now + if(!inFileOrder) + { + ReadBlockIndex(true /* have already read and verified the magic number */); + } + + // Get header + file_StreamFormat hdr; + if(inFileOrder) + { + // Read the header, without the magic number + if(!mrEncodedFile.ReadFullBuffer(((uint8_t*)&hdr) + sizeof(magic), sizeof(hdr) - sizeof(magic), + 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + // Put in magic number + hdr.mMagicValue = magic; + } + else + { + // Not in file order, so need to read the full header + if(!mrEncodedFile.ReadFullBuffer(&hdr, sizeof(hdr), 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + } + + // Check magic number + if(ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V1 +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V0 +#endif + ) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // Get the filename + mFilename.ReadFromStream(mrEncodedFile, mTimeout); + + // Get the attributes (either from stream, or supplied attributes) + if(pAlterativeAttr != 0) + { + // Read dummy attributes + BackupClientFileAttributes attr; + attr.ReadFromStream(mrEncodedFile, mTimeout); + + // Set to supplied attributes + mAttributes = *pAlterativeAttr; + } + else + { + // Read the attributes from the stream + mAttributes.ReadFromStream(mrEncodedFile, mTimeout); + } + + // If it is in file order, go and read the file attributes + // Requires that the stream can seek + if(inFileOrder) + { + // Make sure the file size is known + if(fileSize == IOStream::SizeOfStreamUnknown) + { + THROW_EXCEPTION(BackupStoreException, StreamDoesntHaveRequiredFeatures) + } + + // Store current location (beginning of encoded blocks) + int64_t endOfHeaderPos = mrEncodedFile.GetPosition(); + + // Work out where the index is + int64_t numBlocks = box_ntoh64(hdr.mNumBlocks); + int64_t blockHeaderPos = fileSize - ((numBlocks * sizeof(file_BlockIndexEntry)) + sizeof(file_BlockIndexHeader)); + + // Seek to that position + mrEncodedFile.Seek(blockHeaderPos, IOStream::SeekType_Absolute); + + // Read the block index + ReadBlockIndex(false /* magic number still to be read */); + + // Seek back to the end of header position, ready for reading the chunks + mrEncodedFile.Seek(endOfHeaderPos, IOStream::SeekType_Absolute); + } + + // Check view of blocks from block header and file header match + if(mNumBlocks != (int64_t)box_ntoh64(hdr.mNumBlocks)) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // Need to allocate some memory for the two blocks for reading encoded data, and clear data + if(mNumBlocks > 0) + { + // Find the maximum encoded data size + int32_t maxEncodedDataSize = 0; + const file_BlockIndexEntry *entry = (file_BlockIndexEntry *)mpBlockIndex; + ASSERT(entry != 0); + for(int64_t e = 0; e < mNumBlocks; e++) + { + // Get the clear and encoded size + int32_t encodedSize = box_ntoh64(entry[e].mEncodedSize); + ASSERT(encodedSize > 0); + + // Larger? + if(encodedSize > maxEncodedDataSize) maxEncodedDataSize = encodedSize; + } + + // Allocate those blocks! + mpEncodedData = (uint8_t*)BackupStoreFile::CodingChunkAlloc(maxEncodedDataSize + 32); + + // Allocate the block for the clear data, using the hint from the header. + // If this is wrong, things will exception neatly later on, so it can't be used + // to do anything more than cause an error on downloading. + mClearDataSize = OutputBufferSizeForKnownOutputSize(ntohl(hdr.mMaxBlockClearSize)) + 32; + mpClearData = (uint8_t*)::malloc(mClearDataSize); + } +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::ReadBlockIndex(bool) +// Purpose: Read the block index from the stream, and store in internal buffer (minus header) +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::DecodedStream::ReadBlockIndex(bool MagicAlreadyRead) +{ + // Header + file_BlockIndexHeader blkhdr; + + // Read it in -- way depends on how whether the magic number has already been read + if(MagicAlreadyRead) + { + // Read the header, without the magic number + if(!mrEncodedFile.ReadFullBuffer(((uint8_t*)&blkhdr) + sizeof(blkhdr.mMagicValue), sizeof(blkhdr) - sizeof(blkhdr.mMagicValue), + 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + } + else + { + // Magic not already read, so need to read the full header + if(!mrEncodedFile.ReadFullBuffer(&blkhdr, sizeof(blkhdr), 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + + // Check magic value + if(ntohl(blkhdr.mMagicValue) != OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V1 +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && ntohl(blkhdr.mMagicValue) != OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V0 +#endif + ) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + } + + // Get the number of blocks out of the header + mNumBlocks = box_ntoh64(blkhdr.mNumBlocks); + + // Read the IV base + mEntryIVBase = box_ntoh64(blkhdr.mEntryIVBase); + + // Load the block entries in? + if(mNumBlocks > 0) + { + // How big is the index? + int64_t indexSize = sizeof(file_BlockIndexEntry) * mNumBlocks; + + // Allocate some memory + mpBlockIndex = ::malloc(indexSize); + if(mpBlockIndex == 0) + { + throw std::bad_alloc(); + } + + // Read it in + if(!mrEncodedFile.ReadFullBuffer(mpBlockIndex, indexSize, 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + } +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::Read(void *, int, int) +// Purpose: As interface. Reads decrpyted data. +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +int BackupStoreFile::DecodedStream::Read(void *pBuffer, int NBytes, int Timeout) +{ + // Symlinks don't have data. So can't read it. Not even zero bytes. + if(IsSymLink()) + { + // Don't allow reading in this case + THROW_EXCEPTION(BackupStoreException, ThereIsNoDataInASymLink); + } + + // Already finished? + if(mCurrentBlock >= mNumBlocks) + { + // At end of stream, nothing to do + return 0; + } + + int bytesToRead = NBytes; + uint8_t *output = (uint8_t*)pBuffer; + + while(bytesToRead > 0 && mCurrentBlock < mNumBlocks) + { + // Anything left in the current block? + if(mPositionInCurrentBlock < mCurrentBlockClearSize) + { + // Copy data out of this buffer + int s = mCurrentBlockClearSize - mPositionInCurrentBlock; + if(s > bytesToRead) s = bytesToRead; // limit to requested data + + // Copy + ::memcpy(output, mpClearData + mPositionInCurrentBlock, s); + + // Update positions + output += s; + mPositionInCurrentBlock += s; + bytesToRead -= s; + } + + // Need to get some more data? + if(bytesToRead > 0 && mPositionInCurrentBlock >= mCurrentBlockClearSize) + { + // Number of next block + ++mCurrentBlock; + if(mCurrentBlock >= mNumBlocks) + { + // Stop now! + break; + } + + // Get the size from the block index + const file_BlockIndexEntry *entry = (file_BlockIndexEntry *)mpBlockIndex; + int32_t encodedSize = box_ntoh64(entry[mCurrentBlock].mEncodedSize); + if(encodedSize <= 0) + { + // The caller is attempting to decode a file which is the direct result of a diff + // operation, and so does not contain all the data. + // It needs to be combined with the previous version first. + THROW_EXCEPTION(BackupStoreException, CannotDecodeDiffedFilesWithoutCombining) + } + + // Load in next block + if(!mrEncodedFile.ReadFullBuffer(mpEncodedData, encodedSize, 0 /* not interested in bytes read if this fails */, mTimeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, WhenDecodingExpectedToReadButCouldnt) + } + + // Decode the data + mCurrentBlockClearSize = BackupStoreFile::DecodeChunk(mpEncodedData, encodedSize, mpClearData, mClearDataSize); + + // Calculate IV for this entry + uint64_t iv = mEntryIVBase; + iv += mCurrentBlock; + // Convert to network byte order before encrypting with it, so that restores work on + // platforms with different endiannesses. + iv = box_hton64(iv); + sBlowfishDecryptBlockEntry.SetIV(&iv); + + // Decrypt the encrypted section + file_BlockIndexEntryEnc entryEnc; + int sectionSize = sBlowfishDecryptBlockEntry.TransformBlock(&entryEnc, sizeof(entryEnc), + entry[mCurrentBlock].mEnEnc, sizeof(entry[mCurrentBlock].mEnEnc)); + if(sectionSize != sizeof(entryEnc)) + { + THROW_EXCEPTION(BackupStoreException, BlockEntryEncodingDidntGiveExpectedLength) + } + + // Make sure this is the right size + if(mCurrentBlockClearSize != (int32_t)ntohl(entryEnc.mSize)) + { +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + if(!mIsOldVersion) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + // Versions 0.05 and previous of Box Backup didn't properly handle endianess of the + // IV for the encrypted section. Try again, with the thing the other way round + iv = box_swap64(iv); + sBlowfishDecryptBlockEntry.SetIV(&iv); + int sectionSize = sBlowfishDecryptBlockEntry.TransformBlock(&entryEnc, sizeof(entryEnc), + entry[mCurrentBlock].mEnEnc, sizeof(entry[mCurrentBlock].mEnEnc)); + if(sectionSize != sizeof(entryEnc)) + { + THROW_EXCEPTION(BackupStoreException, BlockEntryEncodingDidntGiveExpectedLength) + } + if(mCurrentBlockClearSize != (int32_t)ntohl(entryEnc.mSize)) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + else + { + // Warn and log this issue + if(!sWarnedAboutBackwardsCompatiblity) + { + ::printf("WARNING: Decoded one or more files using backwards compatibility mode for block index.\n"); + ::syslog(LOG_ERR, "WARNING: Decoded one or more files using backwards compatibility mode for block index.\n"); + sWarnedAboutBackwardsCompatiblity = true; + } + } +#else + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) +#endif + } + + // Check the digest + MD5Digest md5; + md5.Add(mpClearData, mCurrentBlockClearSize); + md5.Finish(); + if(!md5.DigestMatches((uint8_t*)entryEnc.mStrongChecksum)) + { + THROW_EXCEPTION(BackupStoreException, BackupStoreFileFailedIntegrityCheck) + } + + // Set vars to say what's happening + mPositionInCurrentBlock = 0; + } + } + + ASSERT(bytesToRead >= 0); + ASSERT(bytesToRead <= NBytes); + + return NBytes - bytesToRead; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::IsSymLink() +// Purpose: Is the unencoded file actually a symlink? +// Created: 10/12/03 +// +// -------------------------------------------------------------------------- +bool BackupStoreFile::DecodedStream::IsSymLink() +{ + // First, check in with the attributes + if(!mAttributes.IsSymLink()) + { + return false; + } + + // So the attributes think it is a symlink. + // Consistency check... + if(mNumBlocks != 0) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + return true; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::Write(const void *, int) +// Purpose: As interface. Throws exception, as you can't write to this stream. +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::DecodedStream::Write(const void *pBuffer, int NBytes) +{ + THROW_EXCEPTION(BackupStoreException, CantWriteToDecodedFileStream) +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::StreamDataLeft() +// Purpose: As interface. Any data left? +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +bool BackupStoreFile::DecodedStream::StreamDataLeft() +{ + return mCurrentBlock < mNumBlocks; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodedStream::StreamClosed() +// Purpose: As interface. Always returns true, no writing allowed. +// Created: 9/12/03 +// +// -------------------------------------------------------------------------- +bool BackupStoreFile::DecodedStream::StreamClosed() +{ + // Can't write to this stream! + return true; +} + + + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::SetBlowfishKey(const void *, int) +// Purpose: Static. Sets the key to use for encryption and decryption. +// Created: 7/12/03 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::SetBlowfishKeys(const void *pKey, int KeyLength, const void *pBlockEntryKey, int BlockEntryKeyLength) +{ + // IVs set later + sBlowfishEncrypt.Reset(); + sBlowfishEncrypt.Init(CipherContext::Encrypt, CipherBlowfish(CipherDescription::Mode_CBC, pKey, KeyLength)); + sBlowfishDecrypt.Reset(); + sBlowfishDecrypt.Init(CipherContext::Decrypt, CipherBlowfish(CipherDescription::Mode_CBC, pKey, KeyLength)); + + sBlowfishEncryptBlockEntry.Reset(); + sBlowfishEncryptBlockEntry.Init(CipherContext::Encrypt, CipherBlowfish(CipherDescription::Mode_CBC, pBlockEntryKey, BlockEntryKeyLength)); + sBlowfishEncryptBlockEntry.UsePadding(false); + sBlowfishDecryptBlockEntry.Reset(); + sBlowfishDecryptBlockEntry.Init(CipherContext::Decrypt, CipherBlowfish(CipherDescription::Mode_CBC, pBlockEntryKey, BlockEntryKeyLength)); + sBlowfishDecryptBlockEntry.UsePadding(false); +} + + +#ifndef HAVE_OLD_SSL +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::SetAESKey(const void *, int) +// Purpose: Sets the AES key to use for file data encryption. Will select AES as +// the cipher to use when encrypting. +// Created: 27/4/04 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::SetAESKey(const void *pKey, int KeyLength) +{ + // Setup context + sAESEncrypt.Reset(); + sAESEncrypt.Init(CipherContext::Encrypt, CipherAES(CipherDescription::Mode_CBC, pKey, KeyLength)); + sAESDecrypt.Reset(); + sAESDecrypt.Init(CipherContext::Decrypt, CipherAES(CipherDescription::Mode_CBC, pKey, KeyLength)); + + // Set encryption to use this key, instead of the "default" blowfish key + spEncrypt = &sAESEncrypt; + sEncryptCipherType = HEADER_AES_ENCODING; +} +#endif + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::MaxBlockSizeForChunkSize(int) +// Purpose: The maximum output size of a block, given the chunk size +// Created: 7/12/03 +// +// -------------------------------------------------------------------------- +int BackupStoreFile::MaxBlockSizeForChunkSize(int ChunkSize) +{ + // Calculate... the maximum size of output by first the largest it could be after compression, + // which is encrypted, and has a 1 bytes header and the IV added, plus 1 byte for luck + // And then on top, add 128 bytes just to make sure. (Belts and braces approach to fixing + // an problem where a rather non-compressable file didn't fit in a block buffer.) + return sBlowfishEncrypt.MaxOutSizeForInBufferSize(Compress_MaxSizeForCompressedData(ChunkSize)) + 1 + 1 + + sBlowfishEncrypt.GetIVLength() + 128; +} + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodeChunk(const void *, int, BackupStoreFile::EncodingBuffer &) +// Purpose: Encodes a chunk (encryption, possible compressed beforehand) +// Created: 8/12/03 +// +// -------------------------------------------------------------------------- +int BackupStoreFile::EncodeChunk(const void *Chunk, int ChunkSize, BackupStoreFile::EncodingBuffer &rOutput) +{ + ASSERT(spEncrypt != 0); + + // Check there's some space in the output block + if(rOutput.mBufferSize < 256) + { + rOutput.Reallocate(256); + } + + // Check alignment of the block + ASSERT((((uint32_t)(long)rOutput.mpBuffer) % BACKUPSTOREFILE_CODING_BLOCKSIZE) == BACKUPSTOREFILE_CODING_OFFSET); + + // Want to compress it? + bool compressChunk = (ChunkSize >= BACKUP_FILE_MIN_COMPRESSED_CHUNK_SIZE); + + // Build header + uint8_t header = sEncryptCipherType << HEADER_ENCODING_SHIFT; + if(compressChunk) header |= HEADER_CHUNK_IS_COMPRESSED; + + // Store header + rOutput.mpBuffer[0] = header; + int outOffset = 1; + + // Setup cipher, and store the IV + int ivLen = 0; + const void *iv = spEncrypt->SetRandomIV(ivLen); + ::memcpy(rOutput.mpBuffer + outOffset, iv, ivLen); + outOffset += ivLen; + + // Start encryption process + spEncrypt->Begin(); + + #define ENCODECHUNK_CHECK_SPACE(ToEncryptSize) \ + { \ + if((rOutput.mBufferSize - outOffset) < ((ToEncryptSize) + 128)) \ + { \ + rOutput.Reallocate(rOutput.mBufferSize + (ToEncryptSize) + 128); \ + } \ + } + + // Encode the chunk + if(compressChunk) + { + // buffer to compress into + uint8_t buffer[2048]; + + // Set compressor with all the chunk as an input + Compress<true> compress; + compress.Input(Chunk, ChunkSize); + compress.FinishInput(); + + // Get and encrypt output + while(!compress.OutputHasFinished()) + { + int s = compress.Output(buffer, sizeof(buffer)); + if(s > 0) + { + ENCODECHUNK_CHECK_SPACE(s) + outOffset += spEncrypt->Transform(rOutput.mpBuffer + outOffset, rOutput.mBufferSize - outOffset, buffer, s); + } + else + { + // Should never happen, as we put all the input in in one go. + // So if this happens, it means there's a logical problem somewhere + THROW_EXCEPTION(BackupStoreException, Internal) + } + } + ENCODECHUNK_CHECK_SPACE(16) + outOffset += spEncrypt->Final(rOutput.mpBuffer + outOffset, rOutput.mBufferSize - outOffset); + } + else + { + // Straight encryption + ENCODECHUNK_CHECK_SPACE(ChunkSize) + outOffset += spEncrypt->Transform(rOutput.mpBuffer + outOffset, rOutput.mBufferSize - outOffset, Chunk, ChunkSize); + ENCODECHUNK_CHECK_SPACE(16) + outOffset += spEncrypt->Final(rOutput.mpBuffer + outOffset, rOutput.mBufferSize - outOffset); + } + + ASSERT(outOffset < rOutput.mBufferSize); // first check should have sorted this -- merely logic check + + return outOffset; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::DecodeChunk(const void *, int, void *, int) +// Purpose: Decode an encoded chunk -- use OutputBufferSizeForKnownOutputSize() to find +// the extra output buffer size needed before calling. +// See notes in EncodeChunk() for notes re alignment of the +// encoded data. +// Created: 8/12/03 +// +// -------------------------------------------------------------------------- +int BackupStoreFile::DecodeChunk(const void *Encoded, int EncodedSize, void *Output, int OutputSize) +{ + // Check alignment of the encoded block + ASSERT((((uint32_t)(long)Encoded) % BACKUPSTOREFILE_CODING_BLOCKSIZE) == BACKUPSTOREFILE_CODING_OFFSET); + + // First check + if(EncodedSize < 1) + { + THROW_EXCEPTION(BackupStoreException, BadEncodedChunk) + } + + const uint8_t *input = (uint8_t*)Encoded; + + // Get header, make checks, etc + uint8_t header = input[0]; + bool chunkCompressed = (header & HEADER_CHUNK_IS_COMPRESSED) == HEADER_CHUNK_IS_COMPRESSED; + uint8_t encodingType = (header >> HEADER_ENCODING_SHIFT); + if(encodingType != HEADER_BLOWFISH_ENCODING && encodingType != HEADER_AES_ENCODING) + { + THROW_EXCEPTION(BackupStoreException, ChunkHasUnknownEncoding) + } + +#ifndef HAVE_OLD_SSL + // Choose cipher + CipherContext &cipher((encodingType == HEADER_AES_ENCODING)?sAESDecrypt:sBlowfishDecrypt); +#else + // AES not supported with this version of OpenSSL + if(encodingType == HEADER_AES_ENCODING) + { + THROW_EXCEPTION(BackupStoreException, AEScipherNotSupportedByInstalledOpenSSL) + } + CipherContext &cipher(sBlowfishDecrypt); +#endif + + // Check enough space for header, an IV and one byte of input + int ivLen = cipher.GetIVLength(); + if(EncodedSize < (1 + ivLen + 1)) + { + THROW_EXCEPTION(BackupStoreException, BadEncodedChunk) + } + + // Set IV in decrypt context, and start + cipher.SetIV(input + 1); + cipher.Begin(); + + // Setup vars for code + int inOffset = 1 + ivLen; + uint8_t *output = (uint8_t*)Output; + int outOffset = 0; + + // Do action + if(chunkCompressed) + { + // Do things in chunks + uint8_t buffer[2048]; + int inputBlockLen = cipher.InSizeForOutBufferSize(sizeof(buffer)); + + // Decompressor + Compress<false> decompress; + + while(inOffset < EncodedSize) + { + // Decrypt a block + int bl = inputBlockLen; + if(bl > (EncodedSize - inOffset)) bl = EncodedSize - inOffset; // not too long + int s = cipher.Transform(buffer, sizeof(buffer), input + inOffset, bl); + inOffset += bl; + + // Decompress the decrypted data + if(s > 0) + { + decompress.Input(buffer, s); + int os = 0; + do + { + os = decompress.Output(output + outOffset, OutputSize - outOffset); + outOffset += os; + } while(os > 0); + + // Check that there's space left in the output buffer -- there always should be + if(outOffset >= OutputSize) + { + THROW_EXCEPTION(BackupStoreException, NotEnoughSpaceToDecodeChunk) + } + } + } + + // Get any compressed data remaining in the cipher context and compression + int s = cipher.Final(buffer, sizeof(buffer)); + decompress.Input(buffer, s); + decompress.FinishInput(); + while(!decompress.OutputHasFinished()) + { + int os = decompress.Output(output + outOffset, OutputSize - outOffset); + outOffset += os; + + // Check that there's space left in the output buffer -- there always should be + if(outOffset >= OutputSize) + { + THROW_EXCEPTION(BackupStoreException, NotEnoughSpaceToDecodeChunk) + } + } + } + else + { + // Easy decryption + outOffset += cipher.Transform(output + outOffset, OutputSize - outOffset, input + inOffset, EncodedSize - inOffset); + outOffset += cipher.Final(output + outOffset, OutputSize - outOffset); + } + + return outOffset; +} + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::ReorderFileToStreamOrder(IOStream *, bool) +// Purpose: Returns a stream which gives a Stream order version of the encoded file. +// If TakeOwnership == true, then the input stream will be deleted when the +// returned stream is deleted. +// The input stream must be seekable. +// Created: 10/12/03 +// +// -------------------------------------------------------------------------- +std::auto_ptr<IOStream> BackupStoreFile::ReorderFileToStreamOrder(IOStream *pStream, bool TakeOwnership) +{ + ASSERT(pStream != 0); + + // Get the size of the file + int64_t fileSize = pStream->BytesLeftToRead(); + if(fileSize == IOStream::SizeOfStreamUnknown) + { + THROW_EXCEPTION(BackupStoreException, StreamDoesntHaveRequiredFeatures) + } + + // Read the header + int bytesRead = 0; + file_StreamFormat hdr; + bool readBlock = pStream->ReadFullBuffer(&hdr, sizeof(hdr), &bytesRead); + + // Seek backwards to put the file pointer back where it was before we started this + pStream->Seek(0 - bytesRead, IOStream::SeekType_Relative); + + // Check we got a block + if(!readBlock) + { + // Couldn't read header -- assume file bad + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // Check magic number + if(ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V1 +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && ntohl(hdr.mMagicValue) != OBJECTMAGIC_FILE_MAGIC_VALUE_V0 +#endif + ) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // Get number of blocks + int64_t numBlocks = box_ntoh64(hdr.mNumBlocks); + + // Calculate where the block index will be, check it's reasonable + int64_t blockIndexSize = ((numBlocks * sizeof(file_BlockIndexEntry)) + sizeof(file_BlockIndexHeader)); + int64_t blockIndexLoc = fileSize - blockIndexSize; + if(blockIndexLoc < 0) + { + // Doesn't look good! + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + + // Build a reordered stream + std::auto_ptr<IOStream> reordered(new ReadGatherStream(TakeOwnership)); + + // Set it up... + ReadGatherStream &rreordered(*((ReadGatherStream*)reordered.get())); + int component = rreordered.AddComponent(pStream); + // Send out the block index + rreordered.AddBlock(component, blockIndexSize, true, blockIndexLoc); + // And then the rest of the file + rreordered.AddBlock(component, blockIndexLoc, true, 0); + + return reordered; +} + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::ResetStats() +// Purpose: Reset the gathered statistics +// Created: 20/1/04 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::ResetStats() +{ + msStats.mBytesInEncodedFiles = 0; + msStats.mBytesAlreadyOnServer = 0; + msStats.mTotalFileStreamSize = 0; +} + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::CompareFileContentsAgainstBlockIndex(const char *, IOStream &) +// Purpose: Compares the contents of a file against the checksums contained in the +// block index. Returns true if the checksums match, meaning the file is +// extremely likely to match the original. Will always consume the entire index. +// Created: 21/1/04 +// +// -------------------------------------------------------------------------- +bool BackupStoreFile::CompareFileContentsAgainstBlockIndex(const char *Filename, IOStream &rBlockIndex, int Timeout) +{ + // is it a symlink? + bool sourceIsSymlink = false; + { + struct stat st; + if(::lstat(Filename, &st) == -1) + { + THROW_EXCEPTION(CommonException, OSFileError) + } + if((st.st_mode & S_IFMT) == S_IFLNK) + { + sourceIsSymlink = true; + } + } + + // Open file, if it's not a symlink + std::auto_ptr<FileStream> in; + if(!sourceIsSymlink) + { + in.reset(new FileStream(Filename)); + } + + // Read header + file_BlockIndexHeader hdr; + if(!rBlockIndex.ReadFullBuffer(&hdr, sizeof(hdr), 0 /* not interested in bytes read if this fails */, Timeout)) + { + // Couldn't read header + THROW_EXCEPTION(BackupStoreException, CouldntReadEntireStructureFromStream) + } + + // Check magic + if(hdr.mMagicValue != (int32_t)htonl(OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V1) +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + && hdr.mMagicValue != (int32_t)htonl(OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V0) +#endif + ) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + bool isOldVersion = hdr.mMagicValue == (int32_t)htonl(OBJECTMAGIC_FILE_BLOCKS_MAGIC_VALUE_V0); +#endif + + // Get basic information + int64_t numBlocks = box_ntoh64(hdr.mNumBlocks); + uint64_t entryIVBase = box_ntoh64(hdr.mEntryIVBase); + + //TODO: Verify that these sizes look reasonable + + // setup + void *data = 0; + int32_t dataSize = -1; + bool matches = true; + int64_t totalSizeInBlockIndex = 0; + + try + { + for(int64_t b = 0; b < numBlocks; ++b) + { + // Read an entry from the stream + file_BlockIndexEntry entry; + if(!rBlockIndex.ReadFullBuffer(&entry, sizeof(entry), 0 /* not interested in bytes read if this fails */, Timeout)) + { + // Couldn't read entry + THROW_EXCEPTION(BackupStoreException, CouldntReadEntireStructureFromStream) + } + + // Calculate IV for this entry + uint64_t iv = entryIVBase; + iv += b; + iv = box_hton64(iv); +#ifndef BOX_DISABLE_BACKWARDS_COMPATIBILITY_BACKUPSTOREFILE + if(isOldVersion) + { + // Reverse the IV for compatibility + iv = box_swap64(iv); + } +#endif + sBlowfishDecryptBlockEntry.SetIV(&iv); + + // Decrypt the encrypted section + file_BlockIndexEntryEnc entryEnc; + int sectionSize = sBlowfishDecryptBlockEntry.TransformBlock(&entryEnc, sizeof(entryEnc), + entry.mEnEnc, sizeof(entry.mEnEnc)); + if(sectionSize != sizeof(entryEnc)) + { + THROW_EXCEPTION(BackupStoreException, BlockEntryEncodingDidntGiveExpectedLength) + } + + // Size of block + int32_t blockClearSize = ntohl(entryEnc.mSize); + if(blockClearSize < 0 || blockClearSize > (BACKUP_FILE_MAX_BLOCK_SIZE + 1024)) + { + THROW_EXCEPTION(BackupStoreException, BadBackupStoreFile) + } + totalSizeInBlockIndex += blockClearSize; + + // Make sure there's enough memory allocated to load the block in + if(dataSize < blockClearSize) + { + // Too small, free the block if it's already allocated + if(data != 0) + { + ::free(data); + data = 0; + } + // Allocate a block + data = ::malloc(blockClearSize + 128); + if(data == 0) + { + throw std::bad_alloc(); + } + dataSize = blockClearSize + 128; + } + + // Load in the block from the file, if it's not a symlink + if(!sourceIsSymlink) + { + if(in->Read(data, blockClearSize) != blockClearSize) + { + // Not enough data left in the file, can't possibly match + matches = false; + } + else + { + // Check the checksum + MD5Digest md5; + md5.Add(data, blockClearSize); + md5.Finish(); + if(!md5.DigestMatches(entryEnc.mStrongChecksum)) + { + // Checksum didn't match + matches = false; + } + } + } + + // Keep on going regardless, to make sure the entire block index stream is read + // -- must always be consistent about what happens with the stream. + } + } + catch(...) + { + // clean up in case of errors + if(data != 0) + { + ::free(data); + data = 0; + } + throw; + } + + // free block + if(data != 0) + { + ::free(data); + data = 0; + } + + // Check for data left over if it's not a symlink + if(!sourceIsSymlink) + { + // Anything left to read in the file? + if(in->BytesLeftToRead() != 0) + { + // File has extra data at the end + matches = false; + } + } + + // Symlinks must have zero size on server + if(sourceIsSymlink) + { + matches = (totalSizeInBlockIndex == 0); + } + + return matches; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodingBuffer::EncodingBuffer() +// Purpose: Constructor +// Created: 25/11/04 +// +// -------------------------------------------------------------------------- +BackupStoreFile::EncodingBuffer::EncodingBuffer() + : mpBuffer(0), + mBufferSize(0) +{ +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodingBuffer::~EncodingBuffer() +// Purpose: Destructor +// Created: 25/11/04 +// +// -------------------------------------------------------------------------- +BackupStoreFile::EncodingBuffer::~EncodingBuffer() +{ + if(mpBuffer != 0) + { + BackupStoreFile::CodingChunkFree(mpBuffer); + mpBuffer = 0; + } +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodingBuffer::Allocate(int) +// Purpose: Do initial allocation of block +// Created: 25/11/04 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::EncodingBuffer::Allocate(int Size) +{ + ASSERT(mpBuffer == 0); + uint8_t *buffer = (uint8_t*)BackupStoreFile::CodingChunkAlloc(Size); + if(buffer == 0) + { + throw std::bad_alloc(); + } + mpBuffer = buffer; + mBufferSize = Size; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFile::EncodingBuffer::Reallocate(int) +// Purpose: Reallocate the block. Try not to call this, it has to copy +// the entire contents as the block can't be reallocated straight. +// Created: 25/11/04 +// +// -------------------------------------------------------------------------- +void BackupStoreFile::EncodingBuffer::Reallocate(int NewSize) +{ +#ifndef WIN32 + TRACE2("Reallocating EncodingBuffer from %d to %d\n", mBufferSize, NewSize); +#endif + ASSERT(mpBuffer != 0); + uint8_t *buffer = (uint8_t*)BackupStoreFile::CodingChunkAlloc(NewSize); + if(buffer == 0) + { + throw std::bad_alloc(); + } + // Copy data + ::memcpy(buffer, mpBuffer, (NewSize > mBufferSize)?mBufferSize:NewSize); + + // Free old + BackupStoreFile::CodingChunkFree(mpBuffer); + + // Store new buffer + mpBuffer = buffer; + mBufferSize = NewSize; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: DiffTimer::DiffTimer(); +// Purpose: Constructor +// Created: 2005/02/01 +// +// -------------------------------------------------------------------------- +DiffTimer::DiffTimer() +{ +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: DiffTimer::DiffTimer(); +// Purpose: Destructor +// Created: 2005/02/01 +// +// -------------------------------------------------------------------------- +DiffTimer::~DiffTimer() +{ +} |