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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 <stdlib.h>
#include "../../encrypted_file.hh"
#include "../../encryption_key.hh"
#include "../../random.hh"
#include "../../tmp_mgr.hh"
#include "../../check.hh"
#include "../../adler32.hh"
char rnd[ 16384 ];
Adler32::Value adler( int sz )
{
Adler32 a;
a.add( rnd, sz );
return a.result();
}
void readAndWrite( EncryptionKey const & key, bool writeBackups,
bool readBackups, bool readSkips )
{
TmpMgr tmpMgr( "/dev/shm" );
sptr< TemporaryFile > tempFile = tmpMgr.makeTemporaryFile();
int fileSize = rand() % ( sizeof( rnd ) + 1 );
fprintf( stderr, "Run with %d bytes, %s%s%s%sfile %s...\n", fileSize,
key.hasKey() ? "" : "no encryption, ",
writeBackups ? "write backups, " : "",
readBackups ? "read backups, " : "",
readSkips ? "read skips, " : "",
tempFile->getFileName().c_str() );
char iv[ Encryption::IvSize ];
Random::genaratePseudo( iv, sizeof( iv ) );
// Write
{
EncryptedFile::OutputStream out( tempFile->getFileName().c_str(), key, iv );
char const * next = rnd;
int avail = 0;
for ( int left = fileSize; left; )
{
CHECK( out.ByteCount() == fileSize - left, "Incorrect bytecount in the "
"middle of writing" );
void * data;
CHECK( out.Next( &data, &avail ), "out.Next() returned false" );
CHECK( avail > 0, "out.Next() returned zero size" );
bool doBackup = writeBackups && ( rand() & 1 );
int backup;
if ( doBackup )
{
backup = rand() % ( avail + 1 );
// Make sure we don't back up and then need to back up again to finish
// the write
if ( avail > left )
backup = avail - left;
avail -= backup;
}
int toWrite = avail > left ? left : avail;
memcpy( data, next, toWrite );
if ( doBackup )
out.BackUp( backup );
next += toWrite;
left -= toWrite;
avail -= toWrite;
if ( !avail && ( rand() & 1 ) )
{
CHECK( adler( next - rnd ) == out.getAdler32(),
"bad adler32 in the middle of writing" );
}
}
if ( avail || ( rand() & 1 ) )
out.BackUp( avail );
CHECK( out.ByteCount() == fileSize, "Incorrect bytecount after writing" );
if ( rand() & 1 )
{
CHECK( adler( fileSize ) == out.getAdler32(),
"bad adler32 of the written file" );
}
}
// Read back
{
EncryptedFile::InputStream in( tempFile->getFileName().c_str(), key, iv );
char const * next = rnd;
void const * data;
int avail = 0;
for ( int left = fileSize; left; )
{
if ( readSkips && ( rand() & 1 ) )
{
int toSkip = rand() % ( left + 1 );
in.Skip( toSkip );
next += toSkip;
left -= toSkip;
avail = 0;
continue;
}
CHECK( in.ByteCount() == fileSize - left, "Incorrect bytecount in the "
"middle of reading" );
CHECK( in.Next( &data, &avail ), "file ended while %d were still left",
left );
CHECK( avail > 0, "in.Next() returned zero size" );
bool doBackup = readBackups && ( rand() & 1 );
int backup;
if ( doBackup )
{
backup = rand() % ( avail + 1 );
avail -= backup;
}
int toRead = avail > left ? left : avail;
CHECK( memcmp( next, data, toRead ) == 0, "Different bytes read than "
"expected at offset %d", int( next - rnd ) );
if ( doBackup )
in.BackUp( backup );
next += toRead;
left -= toRead;
avail -= toRead;
if ( !avail && ( rand() & 1 ) )
{
CHECK( adler( next - rnd ) == in.getAdler32(),
"bad adler32 in the middle of the reading" );
}
}
CHECK( in.ByteCount() == fileSize, "Incorrect bytecount after reading" );
CHECK( !avail, "at least %d bytes still available", avail );
CHECK( !in.Next( &data, &avail ), "file should have ended but resulted in "
"%d more bytes", avail );
if ( rand() & 1 )
{
CHECK( adler( fileSize ) == in.getAdler32(),
"bad adler32 of the read file" );
}
}
}
int main()
{
Random::genaratePseudo( rnd, sizeof( rnd ) );
EncryptionKeyInfo keyInfo;
EncryptionKey::generate( "blah", keyInfo );
EncryptionKey key( "blah", &keyInfo );
EncryptionKey noKey( std::string(), NULL );
for ( size_t iteration = 100000; iteration--; )
readAndWrite( ( rand() & 1 ) ? key : noKey, rand() & 1, rand() & 1,
rand() & 1 );
}
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