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/*
* rsyncrypto - an rsync friendly encryption
* Copyright (C) 2008 Shachar Shemesh for Lingnu Open Source Consulting ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* In addition, as a special exception, the rsyncrypto authors give permission
* to link the code of this program with the OpenSSL library (or with modified
* versions of OpenSSL that use the same license as OpenSSL), and distribute
* linked combinations including the two. You must obey the GNU General Public
* License in all respects for all of the code used other than OpenSSL. If you
* modify this file, you may extend this exception to your version of the file,
* but you are not obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* The project's homepage is at http://rsyncrypto.lingnu.com/
*/
// This is a quick and dirty implementation, designed to plug the corrupted
// files potentially generated by rsyncrypto version 1.07 and 1.08
// The implementation is neither clean nor complete, just "good enough"
#include <precomp.h>
static void usage()
{
std::cerr<<"rsyncrypto_recover: Recover corrupted rsyncrypto file maps"<<std::endl<<
"Usage: rsyncrypto_recover filename > good_file"<<std::endl;
exit(0);
}
struct file_record {
char dirsep;
char crypt[32];
std::string plain;
};
int main( int argc, char *argv[] )
{
int ret=0;
if( argc!=2 )
usage();
try {
autofd fd(argv[1], O_RDONLY);
autommap map(fd, PROT_READ);
size_t offset=0;
enum {DIRSEP, CIPHERNAME, SPACE, PLAINNAME, INVALID, RSYNC107_INVALID} state=DIRSEP;
int line_state=0;
file_record record;
while( offset<map.getsize() ) {
unsigned char ch=map.get_uc()[offset];
switch( state ) {
case DIRSEP:
record.plain="";
// The dir separator may either be a slash or a backslash
if( ch=='/' || ch=='\\' ) {
record.dirsep=ch;
state=CIPHERNAME;
line_state=0;
} else if( ch=='\0' ) {
std::cerr<<"Offset "<<offset<<": Rsyncrypto 1.07 corrupted record - safetly discarded"<<std::endl;
} else if( ch==' ' ) {
state=RSYNC107_INVALID;
} else {
state=INVALID;
std::cerr<<"Offset "<<offset<<": Invalid dir separator char '"<<ch<<"'"<<std::endl;
}
break;
case CIPHERNAME:
if( (ch>='0' && ch<='9') || (ch>='A' && ch<='F') ) {
record.crypt[line_state]=ch;
// A legal hexadecimal character
if( (++line_state)==32 ) {
state=SPACE;
}
} else {
std::cerr<<"Offset "<<offset<<": Invalid character '"<<ch<<"' in crypt name area"<<std::endl;
state=INVALID;
}
break;
case SPACE:
if( ch==' ' )
state=PLAINNAME;
else {
std::cerr<<"Offset "<<offset<<": Got a '"<<ch<<"' instead of a space"<<std::endl;
state=INVALID;
}
break;
case PLAINNAME:
if( ch!='\0' ) {
record.plain+=ch;
} else {
if( record.plain.length()!=0 ) {
// Everything is ok - print the correct record
std::cout<<record.dirsep<<std::string(record.crypt,32)<<" "<<record.plain<<'\0';
std::cerr<<"Successfully recovered data for "<<record.plain<<std::endl;
} else {
std::cerr<<"Offset "<<offset<<": Plain name for cipher "<<std::string(record.crypt,32)<<" is empty"<<std::endl;
}
state=DIRSEP;
}
break;
case INVALID:
break;
case RSYNC107_INVALID:
if( ch=='\0' ) {
std::cerr<<"Offset "<<offset<<": Rsyncrypto 1.07 corrupted record - safetly discarded"<<std::endl;
state=DIRSEP;
} else {
state=INVALID;
std::cerr<<"Offset "<<offset-1<<": Invalid dir separator char ' '"<<std::endl;
}
break;
}
if( state==INVALID && ch=='\0' ) {
state=DIRSEP;
}
offset++;
}
if( state!=DIRSEP ) {
std::cerr<<"Last record is either corrupt or truncated"<<std::endl;
}
} catch( const rscerror &err ) {
std::cerr<<err.error()<<std::endl;
ret=1;
}
return ret;
}
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