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zbackup.cc
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// Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org> and ZBackup contributors, see CONTRIBUTORS
// Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
#include "zbackup.hh"
#include "backup_creator.hh"
#include "backup_file.hh"
#include "backup_restorer.hh"
#include "debug.hh"
#include "sha256.hh"
#include "backup_collector.hh"
#include "config.hh"
#include "utils.hh"
using std::vector;
using std::bitset;
using std::iterator;
ZBackup::ZBackup( string const & storageDir, string const & password,
Config & configIn ):
ZBackupBase( storageDir, password, configIn ),
chunkStorageWriter( config, encryptionkey, tmpMgr, chunkIndex,
getBundlesPath(), getIndexPath(), config.runtime.threads )
{
}
void ZBackup::backupFromStdin( string const & outputFileName )
{
if ( isatty( fileno( stdin ) ) )
throw exWontReadFromTerminal();
if ( File::exists( outputFileName ) )
throw exWontOverwrite( outputFileName );
Sha256 sha256;
BackupCreator backupCreator( config, chunkIndex, chunkStorageWriter );
time_t startTime = time( 0 );
uint64_t totalDataSize = 0;
for ( ; ; )
{
size_t toRead = backupCreator.getInputBufferSize();
// dPrintf( "Reading up to %u bytes from stdin\n", toRead );
void * inputBuffer = backupCreator.getInputBuffer();
size_t rd = fread( inputBuffer, 1, toRead, stdin );
if ( !rd )
{
if ( feof( stdin ) )
{
dPrintf( "No more input on stdin\n" );
break;
}
else
throw exStdinError();
}
sha256.add( inputBuffer, rd );
backupCreator.handleMoreData( rd );
totalDataSize += rd;
}
// Finish up with the creator
backupCreator.finish();
string serialized;
backupCreator.getBackupData( serialized );
BackupInfo info;
info.set_sha256( sha256.finish() );
info.set_size( totalDataSize );
// Shrink the serialized data iteratively until it wouldn't shrink anymore
for ( ; ; )
{
BackupCreator backupCreator( config, chunkIndex, chunkStorageWriter );
char const * ptr = serialized.data();
size_t left = serialized.size();
while( left )
{
size_t bufferSize = backupCreator.getInputBufferSize();
size_t toCopy = bufferSize > left ? left : bufferSize;
memcpy( backupCreator.getInputBuffer(), ptr, toCopy );
backupCreator.handleMoreData( toCopy );
ptr += toCopy;
left -= toCopy;
}
backupCreator.finish();
string newGen;
backupCreator.getBackupData( newGen );
if ( newGen.size() < serialized.size() )
{
serialized.swap( newGen );
info.set_iterations( info.iterations() + 1 );
}
else
break;
}
dPrintf( "Iterations: %u\n", info.iterations() );
info.mutable_backup_data()->swap( serialized );
info.set_time( time( 0 ) - startTime );
// Commit the bundles to the disk before creating the final output file
chunkStorageWriter.commit();
// Now save the resulting BackupInfo
sptr< TemporaryFile > tmpFile = tmpMgr.makeTemporaryFile();
BackupFile::save( tmpFile->getFileName(), encryptionkey, info );
tmpFile->moveOverTo( outputFileName );
}
ZRestore::ZRestore( string const & storageDir, string const & password,
Config & configIn ):
ZBackupBase( storageDir, password, configIn ),
chunkStorageReader( config, encryptionkey, chunkIndex, getBundlesPath(),
config.runtime.cacheSize )
{
}
void ZRestore::restoreToStdin( string const & inputFileName )
{
if ( isatty( fileno( stdout ) ) )
throw exWontWriteToTerminal();
BackupInfo backupInfo;
BackupFile::load( inputFileName, encryptionkey, backupInfo );
string backupData;
// Perform the iterations needed to get to the actual user backup data
BackupRestorer::restoreIterations( chunkStorageReader, backupInfo, backupData, NULL );
struct StdoutWriter: public DataSink
{
Sha256 sha256;
virtual void saveData( void const * data, size_t size )
{
sha256.add( data, size );
if ( fwrite( data, size, 1, stdout ) != 1 )
throw exStdoutError();
}
} stdoutWriter;
BackupRestorer::restore( chunkStorageReader, backupData, &stdoutWriter, NULL );
if ( stdoutWriter.sha256.finish() != backupInfo.sha256() )
throw exChecksumError();
}
ZExchange::ZExchange( string const & srcStorageDir, string const & srcPassword,
string const & dstStorageDir, string const & dstPassword,
Config & configIn ):
srcZBackupBase( srcStorageDir, srcPassword, configIn, true ),
dstZBackupBase( dstStorageDir, dstPassword, configIn, true ),
config( configIn )
{
}
void ZExchange::exchange()
{
vector< BackupExchanger::PendingExchangeRename > pendingExchangeRenames;
if ( config.runtime.exchange.test( BackupExchanger::bundles ) )
{
verbosePrintf( "Searching for bundles...\n" );
vector< string > bundles = BackupExchanger::recreateDirectories(
srcZBackupBase.getBundlesPath(), dstZBackupBase.getBundlesPath() );
for ( std::vector< string >::iterator it = bundles.begin(); it != bundles.end(); ++it )
{
verbosePrintf( "Processing bundle file %s... ", it->c_str() );
string outputFileName ( Dir::addPath( dstZBackupBase.getBundlesPath(), *it ) );
if ( !File::exists( outputFileName ) )
{
sptr< Bundle::Reader > reader = new Bundle::Reader( Dir::addPath (
srcZBackupBase.getBundlesPath(), *it ), srcZBackupBase.encryptionkey, true );
sptr< Bundle::Creator > creator = new Bundle::Creator;
sptr< TemporaryFile > bundleTempFile = dstZBackupBase.tmpMgr.makeTemporaryFile();
creator->write( bundleTempFile->getFileName(), dstZBackupBase.encryptionkey, *reader );
if ( creator.get() && reader.get() )
{
creator.reset();
reader.reset();
pendingExchangeRenames.push_back( BackupExchanger::PendingExchangeRename(
bundleTempFile, outputFileName ) );
verbosePrintf( "done.\n" );
}
}
else
{
verbosePrintf( "file exists - skipped.\n" );
}
}
verbosePrintf( "Bundle exchange completed.\n" );
}
if ( config.runtime.exchange.test( BackupExchanger::index ) )
{
verbosePrintf( "Searching for indicies...\n" );
vector< string > indicies = BackupExchanger::recreateDirectories(
srcZBackupBase.getIndexPath(), dstZBackupBase.getIndexPath() );
for ( std::vector< string >::iterator it = indicies.begin(); it != indicies.end(); ++it )
{
verbosePrintf( "Processing index file %s... ", it->c_str() );
string outputFileName ( Dir::addPath( dstZBackupBase.getIndexPath(), *it ) );
if ( !File::exists( outputFileName ) )
{
sptr< IndexFile::Reader > reader = new IndexFile::Reader( srcZBackupBase.encryptionkey,
Dir::addPath( srcZBackupBase.getIndexPath(), *it ) );
sptr< TemporaryFile > indexTempFile = dstZBackupBase.tmpMgr.makeTemporaryFile();
sptr< IndexFile::Writer > writer = new IndexFile::Writer( dstZBackupBase.encryptionkey,
indexTempFile->getFileName() );
BundleInfo bundleInfo;
Bundle::Id bundleId;
while( reader->readNextRecord( bundleInfo, bundleId ) )
{
writer->add( bundleInfo, bundleId );
}
if ( writer.get() && reader.get() )
{
writer.reset();
reader.reset();
pendingExchangeRenames.push_back( BackupExchanger::PendingExchangeRename(
indexTempFile, outputFileName ) );
verbosePrintf( "done.\n" );
}
}
else
{
verbosePrintf( "file exists - skipped.\n" );
}
}
verbosePrintf( "Index exchange completed.\n" );
}
if ( config.runtime.exchange.test( BackupExchanger::backups ) )
{
BackupInfo backupInfo;
verbosePrintf( "Searching for backups...\n" );
vector< string > backups = BackupExchanger::recreateDirectories(
srcZBackupBase.getBackupsPath(), dstZBackupBase.getBackupsPath() );
for ( std::vector< string >::iterator it = backups.begin(); it != backups.end(); ++it )
{
verbosePrintf( "Processing backup file %s... ", it->c_str() );
string outputFileName ( Dir::addPath( dstZBackupBase.getBackupsPath(), *it ) );
if ( !File::exists( outputFileName ) )
{
BackupFile::load( Dir::addPath( srcZBackupBase.getBackupsPath(), *it ),
srcZBackupBase.encryptionkey, backupInfo );
sptr< TemporaryFile > tmpFile = dstZBackupBase.tmpMgr.makeTemporaryFile();
BackupFile::save( tmpFile->getFileName(), dstZBackupBase.encryptionkey,
backupInfo );
pendingExchangeRenames.push_back( BackupExchanger::PendingExchangeRename(
tmpFile, outputFileName ) );
verbosePrintf( "done.\n" );
}
else
{
verbosePrintf( "file exists - skipped.\n" );
}
}
verbosePrintf( "Backup exchange completed.\n" );
}
if ( pendingExchangeRenames.size() > 0 )
{
verbosePrintf( "Moving files from temp directory to appropriate places... " );
for ( size_t x = pendingExchangeRenames.size(); x--; )
{
BackupExchanger::PendingExchangeRename & r = pendingExchangeRenames[ x ];
r.first->moveOverTo( r.second );
if ( r.first.get() )
{
r.first.reset();
}
}
pendingExchangeRenames.clear();
verbosePrintf( "done.\n" );
}
}
DEF_EX( exSpecifyTwoKeys, "Specify password flag (--non-encrypted or --password-file)"
" for import/export/passwd operation twice (first for source and second for destination)", std::exception )
DEF_EX( exNonEncryptedWithKey, "--non-encrypted and --password-file are incompatible", std::exception )
DEF_EX( exSpecifyEncryptionOptions, "Specify either --password-file or --non-encrypted", std::exception )
int main( int argc, char *argv[] )
{
try
{
bool printHelp = false;
vector< char const * > args;
vector< string > passwords;
Config config;
for( int x = 1; x < argc; ++x )
{
char const * option;
string deprecated;
Config::OptionType optionType = Config::Runtime;
if ( strcmp( argv[ x ], "--password-file" ) == 0 && x + 1 < argc )
{
// Read the password
char const * passwordFile = argv[ x + 1 ];
string passwordData;
if ( passwordFile )
{
File f( passwordFile, File::ReadOnly );
passwordData.resize( f.size() );
f.read( &passwordData[ 0 ], passwordData.size() );
// If the password ends with \n, remove that last \n. Many editors will
// add \n there even if a user doesn't want them to
if ( !passwordData.empty() &&
passwordData[ passwordData.size() - 1 ] == '\n' )
passwordData.resize( passwordData.size() - 1 );
passwords.push_back( passwordData );
}
++x;
}
else
if ( strcmp( argv[ x ], "--non-encrypted" ) == 0 )
{
passwords.push_back( "" );
}
else
if ( strcmp( argv[ x ], "--silent" ) == 0 )
verboseMode = false;
else
if ( strcmp( argv[ x ], "--exchange" ) == 0 && x + 1 < argc )
{
fprintf( stderr, "%s is deprecated, use -O exchange instead\n", argv[ x ] );
deprecated = argv[ x ] + 2;//; + "=" + argv[ x + 1 ];
deprecated += "=";
deprecated += argv[ x + 1 ];
option = deprecated.c_str();
goto parse_option;
}
else
if ( strcmp( argv[ x ], "--threads" ) == 0 && x + 1 < argc )
{
fprintf( stderr, "%s is deprecated, use -O threads instead\n", argv[ x ] );
deprecated = argv[ x ] + 2;
deprecated += "=";
deprecated += argv[ x + 1 ];
option = deprecated.c_str();
goto parse_option;
}
else
if ( strcmp( argv[ x ], "--cache-size" ) == 0 && x + 1 < argc )
{
fprintf( stderr, "%s is deprecated, use -O cache-size instead\n", argv[ x ] );
size_t cacheSizeMb;
char suffix[ 16 ];
int n;
if ( sscanf( argv[ x + 1 ], "%zu %15s %n",
&cacheSizeMb, suffix, &n ) == 2 && !argv[ x + 1][ n ] )
deprecated = argv[ x ] + 2;
deprecated += "=" + Utils::numberToString( cacheSizeMb ) + "MiB";
option = deprecated.c_str();
goto parse_option;
}
else
if ( strcmp( argv[ x ], "--compression" ) == 0 && x + 1 < argc )
{
fprintf( stderr, "%s is deprecated, use -o bundle.compression_method instead\n", argv[ x ] );
deprecated = argv[ x ] + 2;
deprecated += "=";
deprecated += argv[ x + 1 ];
option = deprecated.c_str();
optionType = Config::Storable;
goto parse_option;
}
else
if ( strcmp( argv[ x ], "--help" ) == 0 || strcmp( argv[ x ], "-h" ) == 0 )
{
printHelp = true;
}
else
if ( ( strcmp( argv[ x ], "-o" ) == 0 || strcmp( argv[ x ], "-O" ) == 0 )
&& x + 1 < argc )
{
option = argv[ x + 1 ];
if ( option )
{
if ( strcmp( argv[ x ], "-O" ) == 0 )
optionType = Config::Runtime;
else
if ( strcmp( argv[ x ], "-o" ) == 0 )
optionType = Config::Storable;
if ( strcmp( option, "help" ) == 0 )
{
Config::showHelp( optionType );
return EXIT_SUCCESS;
}
else
{
parse_option:
if ( !config.parseOrValidate( option, optionType ) )
goto invalid_option;
}
}
else
{
invalid_option:
fprintf( stderr, "Invalid option specified: %s\n",
option );
return EXIT_FAILURE;
}
++x;
}
else
args.push_back( argv[ x ] );
}
if ( args.size() < 1 || printHelp )
{
fprintf( stderr,
"ZBackup, a versatile deduplicating backup tool, version 1.4\n"
"Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org> and\n"
"ZBackup contributors\n"
"Comes with no warranty. Licensed under GNU GPLv2 or later + OpenSSL.\n"
"Visit the project's home page at http://zbackup.org/\n\n"
"Usage: %s [flags] <command [action]> [command args]\n"
" Flags: --non-encrypted|--password-file <file>\n"
" password flag should be specified twice if import/export/passwd\n"
" command specified\n"
" --silent (default is verbose)\n"
" --help|-h show this message\n"
" -O <Option[=Value]> (overrides runtime configuration,\n"
" can be specified multiple times,\n"
" for detailed runtime options overview run with -O help)\n"
" -o <Option[=Value]> (overrides storable repository\n"
" configuration, can be specified multiple times,\n"
" for detailed storable options overview run with -o help)\n"
" Commands:\n"
" init <storage path> - initializes new storage\n"
" backup <backup file name> - performs a backup from stdin\n"
" restore <backup file name> - restores a backup to stdout\n"
" export <source storage path> <destination storage path> -\n"
" performs export from source to destination storage\n"
" import <source storage path> <destination storage path> -\n"
" performs import from source to destination storage\n"
" gc <storage path> - performs chunk garbage collection\n"
" passwd <storage path> - changes repo info file passphrase\n"
//" info <storage path> - shows repo information\n"
" config [show|edit|set] <storage path> - performs configuration\n"
" manipulations (default is show)\n"
" For export/import storage path must be a valid (initialized) storage\n"
"", *argv );
return EXIT_FAILURE;
}
if ( passwords.size() > 1 &&
( ( passwords[ 0 ].empty() && !passwords[ 1 ].empty() ) ||
( !passwords[ 0 ].empty() && passwords[ 1 ].empty() ) ) &&
( strcmp( args[ 0 ], "export" ) != 0 &&
strcmp( args[ 0 ], "import" ) != 0 &&
strcmp( args[ 0 ], "passwd" ) ) )
throw exNonEncryptedWithKey();
else
if ( passwords.size() != 2 &&
( strcmp( args[ 0 ], "export" ) == 0 ||
strcmp( args[ 0 ], "import" ) == 0 ||
strcmp( args[ 0 ], "passwd" ) == 0 ) )
throw exSpecifyTwoKeys();
else
if ( passwords.size() < 1 )
throw exSpecifyEncryptionOptions();
if ( strcmp( args[ 0 ], "init" ) == 0 )
{
// Perform the init
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <storage path>\n", *argv, args[ 0 ] );
return EXIT_FAILURE;
}
ZBackup::initStorage( args[ 1 ],
passwords[ 0 ], !passwords[ 0 ].empty(), config );
}
else
if ( strcmp( args[ 0 ], "backup" ) == 0 )
{
// Perform the backup
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <backup file name>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
ZBackup zb( ZBackup::deriveStorageDirFromBackupsFile( args[ 1 ] ),
passwords[ 0 ], config );
zb.backupFromStdin( args[ 1 ] );
}
else
if ( strcmp( args[ 0 ], "restore" ) == 0 )
{
// Perform the restore
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <backup file name>\n",
*argv , args[ 0 ] );
return EXIT_FAILURE;
}
ZRestore zr( ZRestore::deriveStorageDirFromBackupsFile( args[ 1 ] ),
passwords[ 0 ], config );
zr.restoreToStdin( args[ 1 ] );
}
else
if ( strcmp( args[ 0 ], "export" ) == 0 || strcmp( args[ 0 ], "import" ) == 0 )
{
if ( args.size() != 3 )
{
fprintf( stderr, "Usage: %s %s <source storage path> <destination storage path>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
if ( config.runtime.exchange.none() )
{
fprintf( stderr, "Specify any --exchange flag\n" );
return EXIT_FAILURE;
}
int src, dst;
if ( strcmp( args[ 0 ], "export" ) == 0 )
{
src = 1;
dst = 2;
}
else
if ( strcmp( args[ 0 ], "import" ) == 0 )
{
src = 2;
dst = 1;
}
dPrintf( "%s src: %s\n", args[ 0 ], args[ src ] );
dPrintf( "%s dst: %s\n", args[ 0 ], args[ dst ] );
ZExchange ze( ZBackupBase::deriveStorageDirFromBackupsFile( args[ src ], true ),
passwords[ src - 1 ],
ZBackupBase::deriveStorageDirFromBackupsFile( args[ dst ], true ),
passwords[ dst - 1 ],
config );
ze.exchange();
}
else
if ( strcmp( args[ 0 ], "gc" ) == 0 )
{
// Perform the restore
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <storage path>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
ZCollector zc( args[ 1 ], passwords[ 0 ], config );
zc.gc();
}
else
if ( strcmp( args[ 0 ], "passwd" ) == 0 )
{
// Perform the password change
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <storage path>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
ZBackupBase zbb( ZBackupBase::deriveStorageDirFromBackupsFile( args[ 1 ], true ),
passwords[ 0 ], true );
if ( passwords[ 0 ].empty() != passwords[ 1 ].empty() )
{
fprintf( stderr,
"Changing repo encryption type (non-encrypted to encrypted and vice versa) is possible "
"only via import/export operations.\n"
"Current repo type: %s.\n", zbb.encryptionkey.hasKey() ? "encrypted" : "non-encrypted" );
return EXIT_FAILURE;
}
zbb.setPassword( passwords[ 1 ] );
}
else
if ( strcmp( args[ 0 ], "info" ) == 0 )
{
// Show repo info
if ( args.size() != 2 )
{
fprintf( stderr, "Usage: %s %s <storage path>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
// TODO: implementation in ZBackupBase
ZBackupBase zbb( ZBackupBase::deriveStorageDirFromBackupsFile( args[ 1 ], true ),
passwords[ 0 ], true );
fprintf( stderr, "NOT IMPLEMENTED YET!\n" );
return EXIT_FAILURE;
}
else
if ( strcmp( args[ 0 ], "config" ) == 0 )
{
if ( args.size() < 2 || args.size() > 3 )
{
fprintf( stderr, "Usage: %s %s [show|edit|set] <storage path>\n",
*argv, args[ 0 ] );
return EXIT_FAILURE;
}
int fieldStorage = 1;
int fieldAction = 2;
if ( args.size() == 3 )
{
fieldStorage = 2;
fieldAction = 1;
}
if ( args.size() > 2 && strcmp( args[ fieldAction ], "edit" ) == 0 )
{
ZBackupBase zbb( ZBackupBase::deriveStorageDirFromBackupsFile( args[ fieldStorage ], true ),
passwords[ 0 ], true );
if ( zbb.editConfigInteractively() )
zbb.saveExtendedStorageInfo();
}
else
if ( args.size() > 2 && strcmp( args[ fieldAction ], "set" ) == 0 )
{
ZBackupBase zbb( ZBackupBase::deriveStorageDirFromBackupsFile( args[ fieldStorage ], true ),
passwords[ 0 ], config, true );
zbb.config.show();
zbb.saveExtendedStorageInfo();
}
else
{
ZBackupBase zbb( ZBackupBase::deriveStorageDirFromBackupsFile( args[ fieldStorage ], true ),
passwords[ 0 ], true );
zbb.config.show();
}
}
else
{
fprintf( stderr, "Error: unknown command line option: %s\n", args[ 0 ] );
return EXIT_FAILURE;
}
}
catch( std::exception & e )
{
fprintf( stderr, "%s\n", e.what() );
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}