public BackupHandler(string backendurl, Options options, BackupResults results)
{
EMPTY_METADATA = Utility.WrapMetadata(new Dictionary<string, string>(), options);
m_options = options;
m_result = results;
m_backendurl = backendurl;
m_attributeFilter = m_options.FileAttributeFilter;
m_symlinkPolicy = m_options.SymlinkPolicy;
m_blocksize = m_options.Blocksize;
m_blockbuffer = new byte[m_options.Blocksize * Math.Max(1, m_options.FileReadBufferSize / m_options.Blocksize)];
m_blocklistbuffer = new byte[m_options.Blocksize];
m_blockhasher = System.Security.Cryptography.HashAlgorithm.Create(m_options.BlockHashAlgorithm);
m_filehasher = System.Security.Cryptography.HashAlgorithm.Create(m_options.FileHashAlgorithm);
if (m_blockhasher == null)
throw new Exception(string.Format(Strings.Foresthash.InvalidHashAlgorithm, m_options.BlockHashAlgorithm));
if (m_filehasher == null)
throw new Exception(string.Format(Strings.Foresthash.InvalidHashAlgorithm, m_options.FileHashAlgorithm));
if (!m_blockhasher.CanReuseTransform)
throw new Exception(string.Format(Strings.Foresthash.InvalidCryptoSystem, m_options.BlockHashAlgorithm));
if (!m_filehasher.CanReuseTransform)
throw new Exception(string.Format(Strings.Foresthash.InvalidCryptoSystem, m_options.FileHashAlgorithm));
if (options.AllowPassphraseChange)
throw new Exception(Strings.Foresthash.PassphraseChangeUnsupported);
}
public BackupHandler(string backendurl, Options options, BackupResults results)
{
EMPTY_METADATA = Utility.WrapMetadata(new Dictionary<string, string>(), options);
m_options = options;
m_result = results;
m_backendurl = backendurl;
m_attributeFilter = m_options.FileAttributeFilter;
m_symlinkPolicy = m_options.SymlinkPolicy;
if (options.AllowPassphraseChange)
throw new Exception(Strings.Foresthash.PassphraseChangeUnsupported);
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
/// <param name="database">The database to use</param>
/// <param name="streamblockchannel">The channel to write blocks to</param>
/// <param name="meta">The metadata ti record</param>
private static async Task AddSymlinkToOutputAsync(string filename, DateTime lastModified, IMetahash meta, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
var metadataid = await AddMetadataToOutputAsync(filename, meta, database, streamblockchannel).ConfigureAwait(false);
await database.AddSymlinkEntryAsync(filename, metadataid.Item2, lastModified);
}
/// <summary>
/// Adds metadata to output, and returns the metadataset ID
/// </summary>
/// <returns>The metadataset ID.</returns>
/// <param name="path">The path for which metadata is processed.</param>
/// <param name="meta">The metadata entry.</param>
/// <param name="database">The database connection.</param>
/// <param name="streamblockchannel">The channel to write streams to.</param>
internal static async Task <Tuple <bool, long> > AddMetadataToOutputAsync(string path, IMetahash meta, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
StreamProcessResult res;
using (var ms = new MemoryStream(meta.Blob))
res = await StreamBlock.ProcessStream(streamblockchannel, path, ms, true, CompressionHint.Default);
return(await database.AddMetadatasetAsync(res.Streamhash, res.Streamlength, res.Blocksetid));
}
/// <summary>
/// Processes the metadata for the given path.
/// </summary>
/// <returns><c>True</c> if the path should be submitted to more analysis, <c>false</c> if there is nothing else to do</returns>
private static async Task <bool> ProcessMetadata(string path, FileAttributes attributes, DateTime lastwrite, Options options, Snapshots.ISnapshotService snapshot, IMetahash emptymetadata, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
if (snapshot.IsSymlink(path, attributes))
{
// Not all reparse points are symlinks.
// For example, on Windows 10 Fall Creator's Update, the OneDrive folder (and all subfolders)
// are reparse points, which allows the folder to hook into the OneDrive service and download things on-demand.
// If we can't find a symlink target for the current path, we won't treat it as a symlink.
string symlinkTarget = snapshot.GetSymlinkTarget(path);
if (!string.IsNullOrWhiteSpace(symlinkTarget))
{
if (options.SymlinkPolicy == Options.SymlinkStrategy.Ignore)
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "IgnoreSymlink", "Ignoring symlink {0}", path);
return(false);
}
if (options.SymlinkPolicy == Options.SymlinkStrategy.Store)
{
var metadata = MetadataGenerator.GenerateMetadata(path, attributes, options, snapshot);
if (!metadata.ContainsKey("CoreSymlinkTarget"))
{
metadata["CoreSymlinkTarget"] = symlinkTarget;
}
var metahash = Utility.WrapMetadata(metadata, options);
await AddSymlinkToOutputAsync(path, DateTime.UtcNow, metahash, database, streamblockchannel).ConfigureAwait(false);
Logging.Log.WriteVerboseMessage(FILELOGTAG, "StoreSymlink", "Stored symlink {0}", path);
// Don't process further
return(false);
}
}
else
{
Logging.Log.WriteVerboseMessage(FILELOGTAG, "FollowingEmptySymlink", "Treating empty symlink as regular path {0}", path);
}
}
if ((attributes & FileAttributes.Directory) == FileAttributes.Directory)
{
IMetahash metahash;
if (!options.SkipMetadata)
{
metahash = Utility.WrapMetadata(MetadataGenerator.GenerateMetadata(path, attributes, options, snapshot), options);
}
else
{
metahash = emptymetadata;
}
Logging.Log.WriteVerboseMessage(FILELOGTAG, "AddDirectory", "Adding directory {0}", path);
await AddFolderToOutputAsync(path, lastwrite, metahash, database, streamblockchannel).ConfigureAwait(false);
return(false);
}
// Regular file, keep going
return(true);
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
/// <param name="hashlist">The list of hashes that make up the file</param>
/// <param name="size">The size of the file</param>
/// <param name="fragmentoffset">The offset into a fragment block where the last few bytes are stored</param>
/// <param name="metadata">A lookup table with various metadata values describing the file</param>
private bool AddSymlinkToOutput(string filename, DateTime scantime, IMetahash meta)
{
long metadataid;
bool r = false;
//TODO: If meta.Size > blocksize...
r |= AddBlockToOutput(meta.Hash, meta.Blob, 0, (int)meta.Size, CompressionHint.Default, false);
r |= m_database.AddMetadataset(meta.Hash, meta.Size, out metadataid, m_transaction);
m_database.AddSymlinkEntry(filename, metadataid, scantime, m_transaction);
return r;
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
/// <param name="hashlist">The list of hashes that make up the file</param>
/// <param name="size">The size of the file</param>
/// <param name="fragmentoffset">The offset into a fragment block where the last few bytes are stored</param>
/// <param name="metadata">A lookup table with various metadata values describing the file</param>
private void AddFileToOutput(string filename, long size, DateTime scantime, IMetahash metadata, IEnumerable<string> hashlist, string filehash, IEnumerable<string> blocklisthashes)
{
long metadataid;
long blocksetid;
//TODO: If metadata.Size > blocksize...
AddBlockToOutput(metadata.Hash, metadata.Blob, 0, (int)metadata.Size, CompressionHint.Default, false);
m_database.AddMetadataset(metadata.Hash, metadata.Size, out metadataid, m_transaction);
m_database.AddBlockset(filehash, size, m_blocksize, hashlist, blocklisthashes, out blocksetid, m_transaction);
//m_filesetvolume.AddFile(filename, filehash, size, scantime, metadata.Hash, metadata.Size, blocklisthashes);
m_database.AddFile(filename, scantime, blocksetid, metadataid, m_transaction);
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
private static async Task AddFolderToOutputAsync(string filename, DateTime lastModified, IMetahash meta, BackupDatabase database, IWriteChannel <StreamBlock> streamblockchannel)
{
var metadataid = await AddMetadataToOutputAsync(filename, meta, database, streamblockchannel);
await database.AddDirectoryEntryAsync(filename, metadataid.Item2, lastModified);
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
/// <param name="hashlist">The list of hashes that make up the file</param>
/// <param name="size">The size of the file</param>
/// <param name="fragmentoffset">The offset into a fragment block where the last few bytes are stored</param>
/// <param name="metadata">A lookup table with various metadata values describing the file</param>
private bool AddSymlinkToOutput(string filename, DateTime lastModified, IMetahash meta)
{
long metadataid;
bool r = false;
if (meta.Size > m_blocksize)
throw new InvalidDataException(string.Format("Too large metadata, cannot handle more than {0} bytes", m_blocksize));
r |= AddBlockToOutput(meta.Hash, meta.Blob, 0, (int)meta.Size, CompressionHint.Default, false);
r |= m_database.AddMetadataset(meta.Hash, meta.Size, out metadataid, m_transaction);
m_database.AddSymlinkEntry(filename, metadataid, lastModified, m_transaction);
return r;
}
/// <summary>
/// Adds a file to the output,
/// </summary>
/// <param name="filename">The name of the file to record</param>
/// <param name="lastModified">The value of the lastModified timestamp</param>
/// <param name="hashlist">The list of hashes that make up the file</param>
/// <param name="size">The size of the file</param>
/// <param name="fragmentoffset">The offset into a fragment block where the last few bytes are stored</param>
/// <param name="metadata">A lookup table with various metadata values describing the file</param>
private void AddFileToOutput(string filename, long size, DateTime lastmodified, IMetahash metadata, IEnumerable<string> hashlist, string filehash, IEnumerable<string> blocklisthashes)
{
long metadataid;
long blocksetid;
if (metadata.Size > m_blocksize)
throw new InvalidDataException(string.Format("Too large metadata, cannot handle more than {0} bytes", m_blocksize));
AddBlockToOutput(metadata.Hash, metadata.Blob, 0, (int)metadata.Size, CompressionHint.Default, false);
m_database.AddMetadataset(metadata.Hash, metadata.Size, out metadataid, m_transaction);
m_database.AddBlockset(filehash, size, m_blocksize, hashlist, blocklisthashes, out blocksetid, m_transaction);
m_database.AddFile(filename, lastmodified, blocksetid, metadataid, m_transaction);
}
