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/* Tarlz - Archiver with multimember lzip compression
Copyright (C) 2013-2021 Antonio Diaz Diaz.
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, see <http://www.gnu.org/licenses/>.
*/
#define _FILE_OFFSET_BITS 64
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <sys/stat.h>
#include "tarlz.h"
#include "arg_parser.h"
namespace {
enum { mode_string_size = 10,
group_string_size = 1 + uname_l + 1 + gname_l + 1 }; // 67
void format_mode_string( const Tar_header header, char buf[mode_string_size] )
{
const Typeflag typeflag = (Typeflag)header[typeflag_o];
std::memcpy( buf, "----------", mode_string_size );
switch( typeflag )
{
case tf_regular: break;
case tf_link: buf[0] = 'h'; break;
case tf_symlink: buf[0] = 'l'; break;
case tf_chardev: buf[0] = 'c'; break;
case tf_blockdev: buf[0] = 'b'; break;
case tf_directory: buf[0] = 'd'; break;
case tf_fifo: buf[0] = 'p'; break;
case tf_hiperf: buf[0] = 'C'; break;
default: buf[0] = '?';
}
const mode_t mode = parse_octal( header + mode_o, mode_l ); // 12 bits
const bool setuid = mode & S_ISUID;
const bool setgid = mode & S_ISGID;
const bool sticky = mode & S_ISVTX;
if( mode & S_IRUSR ) buf[1] = 'r';
if( mode & S_IWUSR ) buf[2] = 'w';
if( mode & S_IXUSR ) buf[3] = setuid ? 's' : 'x';
else if( setuid ) buf[3] = 'S';
if( mode & S_IRGRP ) buf[4] = 'r';
if( mode & S_IWGRP ) buf[5] = 'w';
if( mode & S_IXGRP ) buf[6] = setgid ? 's' : 'x';
else if( setgid ) buf[6] = 'S';
if( mode & S_IROTH ) buf[7] = 'r';
if( mode & S_IWOTH ) buf[8] = 'w';
if( mode & S_IXOTH ) buf[9] = sticky ? 't' : 'x';
else if( sticky ) buf[9] = 'T';
}
int format_user_group_string( const Tar_header header,
char buf[group_string_size] )
{
int len;
if( header[uname_o] && header[gname_o] )
len = snprintf( buf, group_string_size,
" %.32s/%.32s", header + uname_o, header + gname_o );
else
{
const unsigned uid = parse_octal( header + uid_o, uid_l );
const unsigned gid = parse_octal( header + gid_o, gid_l );
len = snprintf( buf, group_string_size, " %u/%u", uid, gid );
}
return len;
}
// return true if dir is a parent directory of name
bool compare_prefix_dir( const char * const dir, const char * const name )
{
int len = 0;
while( dir[len] && dir[len] == name[len] ) ++len;
return ( !dir[len] && len > 0 && ( dir[len-1] == '/' || name[len] == '/' ) );
}
// compare two file names ignoring trailing slashes
bool compare_tslash( const char * const name1, const char * const name2 )
{
const char * p = name1;
const char * q = name2;
while( *p && *p == *q ) { ++p; ++q; }
while( *p == '/' ) ++p;
while( *q == '/' ) ++q;
return ( !*p && !*q );
}
} // end namespace
bool block_is_zero( const uint8_t * const buf, const int size )
{
for( int i = 0; i < size; ++i ) if( buf[i] != 0 ) return false;
return true;
}
bool format_member_name( const Extended & extended, const Tar_header header,
Resizable_buffer & rbuf, const bool long_format )
{
if( long_format )
{
format_mode_string( header, rbuf() );
const int group_string_len =
format_user_group_string( header, rbuf() + mode_string_size );
int offset = mode_string_size + group_string_len;
const time_t mtime = parse_octal( header + mtime_o, mtime_l ); // 33 bits
struct tm tms;
const struct tm * tm = localtime_r( &mtime, &tms );
if( !tm )
{ time_t z = 0; tm = localtime_r( &z, &tms ); if( !tm ) tm = &tms; }
const Typeflag typeflag = (Typeflag)header[typeflag_o];
const bool islink = ( typeflag == tf_link || typeflag == tf_symlink );
const char * const link_string = !islink ? "" :
( ( typeflag == tf_link ) ? " link to " : " -> " );
if( typeflag == tf_chardev || typeflag == tf_blockdev )
offset += snprintf( rbuf() + offset, rbuf.size() - offset, " %5u,%u",
(unsigned)parse_octal( header + devmajor_o, devmajor_l ),
(unsigned)parse_octal( header + devminor_o, devminor_l ) );
else
offset += snprintf( rbuf() + offset, rbuf.size() - offset, " %9llu",
extended.file_size() );
for( int i = 0; i < 2; ++i ) // resize rbuf if not large enough
{
const int len = snprintf( rbuf() + offset, rbuf.size() - offset,
" %4d-%02u-%02u %02u:%02u %s%s%s\n",
1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, extended.path().c_str(),
link_string, islink ? extended.linkpath().c_str() : "" );
if( (int)rbuf.size() > len + offset ) break;
if( !rbuf.resize( len + offset + 1 ) ) return false;
}
}
else
{
if( rbuf.size() < extended.path().size() + 2 &&
!rbuf.resize( extended.path().size() + 2 ) ) return false;
snprintf( rbuf(), rbuf.size(), "%s\n", extended.path().c_str() );
}
return true;
}
bool show_member_name( const Extended & extended, const Tar_header header,
const int vlevel, Resizable_buffer & rbuf )
{
if( verbosity >= vlevel )
{
if( !format_member_name( extended, header, rbuf, verbosity > vlevel ) )
{ show_error( mem_msg ); return false; }
std::fputs( rbuf(), stdout );
std::fflush( stdout );
}
return true;
}
bool check_skip_filename( const Cl_options & cl_opts,
std::vector< char > & name_pending,
const char * const filename )
{
if( Exclude::excluded( filename ) ) return true; // skip excluded files
bool skip = cl_opts.num_files > 0;
if( skip )
for( int i = 0; i < cl_opts.parser.arguments(); ++i )
if( nonempty_arg( cl_opts.parser, i ) )
{
const char * const name =
remove_leading_dotslash( cl_opts.parser.argument( i ).c_str() );
if( compare_prefix_dir( name, filename ) ||
compare_tslash( name, filename ) )
{ skip = false; name_pending[i] = false; break; }
}
return skip;
}
mode_t get_umask()
{
static mode_t mask = 0; // read once, cache the result
static bool first_call = true;
if( first_call ) { first_call = false; mask = umask( 0 ); umask( mask );
mask &= S_IRWXU | S_IRWXG | S_IRWXO; }
return mask;
}
bool make_path( const std::string & name )
{
const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
unsigned end = name.size(); // first slash before last component
while( end > 0 && name[end-1] == '/' ) --end; // remove trailing slashes
while( end > 0 && name[end-1] != '/' ) --end; // remove last component
while( end > 0 && name[end-1] == '/' ) --end; // remove more slashes
unsigned index = 0;
while( index < end )
{
while( index < end && name[index] == '/' ) ++index;
unsigned first = index;
while( index < end && name[index] != '/' ) ++index;
if( first < index )
{
const std::string partial( name, 0, index );
struct stat st;
if( stat( partial.c_str(), &st ) == 0 )
{ if( !S_ISDIR( st.st_mode ) ) return false; }
else if( mkdir( partial.c_str(), mode ) != 0 && errno != EEXIST )
return false;
}
}
return true;
}
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