505 lines
14 KiB
C
505 lines
14 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2008 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h> /* unlink, stat */
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#include <event.h> /* struct evbuffer */
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#include "transmission.h"
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#include "bencode.h"
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#include "crypto.h" /* tr_sha1 */
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#include "metainfo.h"
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#include "platform.h"
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#include "utils.h"
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/***
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****
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***/
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static char*
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getTorrentFilename( const tr_handle * handle,
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const tr_info * inf )
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{
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return tr_strdup_printf( "%s%c%s.%16.16s.torrent",
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tr_getTorrentDir( handle ),
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TR_PATH_DELIMITER,
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inf->name,
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inf->hashString );
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}
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static char*
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getOldTorrentFilename( const tr_handle * handle,
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const tr_info * inf )
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{
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char * ret;
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struct evbuffer * buf = evbuffer_new( );
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evbuffer_add_printf( buf, "%s%c%s", tr_getTorrentDir( handle ),
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TR_PATH_DELIMITER,
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inf->hashString );
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if( handle->tag )
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evbuffer_add_printf( buf, "-%s", handle->tag );
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ret = tr_strndup( EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ) );
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evbuffer_free( buf );
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return ret;
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}
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void
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tr_metainfoMigrate( tr_handle * handle,
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tr_info * inf )
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{
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struct stat new_sb;
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char * name = getTorrentFilename( handle, inf );
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if( stat( name, &new_sb ) || ( ( new_sb.st_mode & S_IFMT ) != S_IFREG ) )
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{
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char * old_name = getOldTorrentFilename( handle, inf );
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size_t contentLen;
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uint8_t * content;
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tr_mkdirp( tr_getTorrentDir( handle ), 0777 );
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if( ( content = tr_loadFile( old_name, &contentLen ) ) )
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{
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FILE * out;
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errno = 0;
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out = fopen( name, "wb+" );
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if( !out )
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{
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tr_nerr( inf->name, _( "Couldn't create \"%1$s\": %2$s" ),
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name, tr_strerror( errno ) );
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}
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else
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{
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if( fwrite( content, sizeof( uint8_t ), contentLen, out )
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== contentLen )
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{
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tr_free( inf->torrent );
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inf->torrent = tr_strdup( name );
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tr_sessionSetTorrentFile( handle, inf->hashString, name );
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unlink( old_name );
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}
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fclose( out );
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}
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}
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tr_free( content );
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tr_free( old_name );
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}
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tr_free( name );
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}
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/***
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****
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***/
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static int
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getfile( char ** setme,
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const char * root,
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tr_benc * path )
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{
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int err;
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if( !tr_bencIsList( path ) )
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{
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err = TR_EINVALID;
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}
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else
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{
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struct evbuffer * buf = evbuffer_new( );
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int n = tr_bencListSize( path );
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int i;
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evbuffer_add( buf, root, strlen( root ) );
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for( i = 0; i < n; ++i )
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{
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const char * str;
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if( tr_bencGetStr( tr_bencListChild( path, i ), &str )
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&& strcmp( str, ".." ) )
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{
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evbuffer_add( buf, TR_PATH_DELIMITER_STR, 1 );
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evbuffer_add( buf, str, strlen( str ) );
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}
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}
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*setme = tr_strndup( EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ) );
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/* fprintf( stderr, "[%s]\n", *setme ); */
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evbuffer_free( buf );
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err = 0;
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}
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return err;
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}
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static const char*
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parseFiles( tr_info * inf,
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tr_benc * files,
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const tr_benc * length )
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{
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int64_t len;
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inf->totalSize = 0;
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if( tr_bencIsList( files ) ) /* multi-file mode */
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{
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tr_file_index_t i;
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inf->isMultifile = 1;
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inf->fileCount = tr_bencListSize( files );
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inf->files = tr_new0( tr_file, inf->fileCount );
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for( i = 0; i < inf->fileCount; ++i )
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{
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tr_benc * file;
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tr_benc * path;
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int64_t length;
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file = tr_bencListChild( files, i );
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if( !tr_bencIsDict( file ) )
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return "files";
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if( !tr_bencDictFindList( file, "path.utf-8", &path ) )
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if( !tr_bencDictFindList( file, "path", &path ) )
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return "path";
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if( getfile( &inf->files[i].name, inf->name, path ) )
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return "path";
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if( !tr_bencDictFindInt( file, "length", &length ) )
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return "length";
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inf->files[i].length = length;
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inf->totalSize += length;
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}
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}
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else if( tr_bencGetInt( length, &len ) ) /* single-file mode */
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{
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inf->isMultifile = 0;
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inf->fileCount = 1;
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inf->files = tr_new0( tr_file, 1 );
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inf->files[0].name = tr_strdup( inf->name );
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inf->files[0].length = len;
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inf->totalSize += len;
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}
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else
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{
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return "length";
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}
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return NULL;
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}
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static char *
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announceToScrape( const char * announce )
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{
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char * scrape = NULL;
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const char * s;
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/* To derive the scrape URL use the following steps:
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* Begin with the announce URL. Find the last '/' in it.
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* If the text immediately following that '/' isn't 'announce'
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* it will be taken as a sign that that tracker doesn't support
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* the scrape convention. If it does, substitute 'scrape' for
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* 'announce' to find the scrape page. */
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if( ( ( s =
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strrchr( announce, '/' ) ) ) && !strncmp( ++s, "announce", 8 ) )
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{
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struct evbuffer * buf = evbuffer_new( );
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evbuffer_add( buf, announce, s - announce );
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evbuffer_add( buf, "scrape", 6 );
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evbuffer_add_printf( buf, "%s", s + 8 );
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scrape = tr_strdup( EVBUFFER_DATA( buf ) );
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evbuffer_free( buf );
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}
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return scrape;
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}
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static const char*
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getannounce( tr_info * inf,
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tr_benc * meta )
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{
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const char * str;
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tr_tracker_info * trackers = NULL;
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int trackerCount = 0;
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tr_benc * tiers;
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/* Announce-list */
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if( tr_bencDictFindList( meta, "announce-list", &tiers ) )
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{
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int n;
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int i, j;
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const int numTiers = tr_bencListSize( tiers );
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n = 0;
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for( i = 0; i < numTiers; ++i )
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n += tr_bencListSize( tr_bencListChild( tiers, i ) );
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trackers = tr_new0( tr_tracker_info, n );
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trackerCount = 0;
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for( i = 0; i < numTiers; ++i )
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{
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tr_benc * tier = tr_bencListChild( tiers, i );
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const int tierSize = tr_bencListSize( tier );
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for( j = 0; j < tierSize; ++j )
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{
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if( tr_bencGetStr( tr_bencListChild( tier, j ), &str ) )
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{
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char * url = tr_strstrip( tr_strdup( str ) );
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if( tr_httpIsValidURL( url ) )
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{
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tr_tracker_info * t = trackers + trackerCount++;
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t->tier = i;
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t->announce = tr_strdup( url );
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t->scrape = announceToScrape( url );
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}
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tr_free( url );
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}
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}
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}
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/* did we use any of the tiers? */
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if( !trackerCount )
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{
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tr_free( trackers );
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trackers = NULL;
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}
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}
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/* Regular announce value */
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if( !trackerCount
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&& tr_bencDictFindStr( meta, "announce", &str ) )
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{
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char * url = tr_strstrip( tr_strdup( str ) );
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if( tr_httpIsValidURL( url ) )
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{
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trackers = tr_new0( tr_tracker_info, 1 );
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trackers[trackerCount].tier = 0;
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trackers[trackerCount].announce = tr_strdup( url );
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trackers[trackerCount++].scrape = announceToScrape( url );
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/*fprintf( stderr, "single announce: [%s]\n", url );*/
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}
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tr_free( url );
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}
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inf->trackers = trackers;
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inf->trackerCount = trackerCount;
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return inf->trackerCount ? NULL : "announce";
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}
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static void
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geturllist( tr_info * inf,
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tr_benc * meta )
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{
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tr_benc * urls;
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if( tr_bencDictFindList( meta, "url-list", &urls ) )
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{
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int i;
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const char * url;
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const int n = tr_bencListSize( urls );
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inf->webseedCount = 0;
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inf->webseeds = tr_new0( char*, n );
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for( i = 0; i < n; ++i )
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if( tr_bencGetStr( tr_bencListChild( urls, i ), &url ) )
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inf->webseeds[inf->webseedCount++] = tr_strdup( url );
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}
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}
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static const char*
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tr_metainfoParseImpl( const tr_handle * handle,
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tr_info * inf,
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const tr_benc * meta_in )
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{
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int64_t i;
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size_t raw_len;
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const char * str;
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const uint8_t * raw;
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tr_benc * beInfo;
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tr_benc * meta = (tr_benc *) meta_in;
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/* info_hash: urlencoded 20-byte SHA1 hash of the value of the info key
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* from the Metainfo file. Note that the value will be a bencoded
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* dictionary, given the definition of the info key above. */
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if( !tr_bencDictFindDict( meta, "info", &beInfo ) )
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return "info";
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else
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{
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int len;
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char * str = tr_bencSave( beInfo, &len );
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tr_sha1( inf->hash, str, len, NULL );
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tr_sha1_to_hex( inf->hashString, inf->hash );
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tr_free( str );
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}
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/* name */
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if( !tr_bencDictFindStr( beInfo, "name.utf-8", &str ) )
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if( !tr_bencDictFindStr( beInfo, "name", &str ) )
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str = "";
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if( !str || !*str )
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return "name";
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tr_free( inf->name );
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inf->name = tr_strdup( str );
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/* comment */
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if( !tr_bencDictFindStr( meta, "comment.utf-8", &str ) )
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if( !tr_bencDictFindStr( meta, "comment", &str ) )
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str = "";
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tr_free( inf->comment );
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inf->comment = tr_strdup( str );
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/* created by */
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if( !tr_bencDictFindStr( meta, "created by.utf-8", &str ) )
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if( !tr_bencDictFindStr( meta, "created by", &str ) )
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str = "";
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tr_free( inf->creator );
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inf->creator = tr_strdup( str );
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/* creation date */
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if( !tr_bencDictFindInt( meta, "creation date", &i ) )
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i = 0;
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inf->dateCreated = i;
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/* private */
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if( !tr_bencDictFindInt( beInfo, "private", &i ) )
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if( !tr_bencDictFindInt( meta, "private", &i ) )
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i = 0;
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inf->isPrivate = i != 0;
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/* piece length */
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if( !tr_bencDictFindInt( beInfo, "piece length", &i ) || ( i < 1 ) )
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return "piece length";
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inf->pieceSize = i;
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/* pieces */
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if( !tr_bencDictFindRaw( beInfo, "pieces", &raw,
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&raw_len ) || ( raw_len % SHA_DIGEST_LENGTH ) )
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return "pieces";
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inf->pieceCount = raw_len / SHA_DIGEST_LENGTH;
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inf->pieces = tr_new0( tr_piece, inf->pieceCount );
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for( i = 0; i < inf->pieceCount; ++i )
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memcpy( inf->pieces[i].hash, &raw[i * SHA_DIGEST_LENGTH],
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SHA_DIGEST_LENGTH );
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/* files */
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if( ( str =
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parseFiles( inf,
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tr_bencDictFind( beInfo,
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"files" ),
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tr_bencDictFind( beInfo, "length" ) ) ) )
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return str;
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if( !inf->fileCount || !inf->totalSize )
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return "files";
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if( (uint64_t) inf->pieceCount !=
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( inf->totalSize + inf->pieceSize - 1 ) / inf->pieceSize )
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return "files";
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/* get announce or announce-list */
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if( ( str = getannounce( inf, meta ) ) )
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return str;
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/* get the url-list */
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geturllist( inf, meta );
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/* filename of Transmission's copy */
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tr_free( inf->torrent );
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inf->torrent = getTorrentFilename( handle, inf );
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return NULL;
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}
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int
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tr_metainfoParse( const tr_handle * handle,
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tr_info * inf,
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const tr_benc * meta_in )
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{
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const char * badTag = tr_metainfoParseImpl( handle, inf, meta_in );
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if( badTag )
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{
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tr_nerr( inf->name, _( "Invalid metadata entry \"%s\"" ), badTag );
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tr_metainfoFree( inf );
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return TR_EINVALID;
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}
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return 0;
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}
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void
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tr_metainfoFree( tr_info * inf )
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{
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tr_file_index_t ff;
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int i;
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for( i = 0; i < inf->webseedCount; ++i )
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tr_free( inf->webseeds[i] );
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for( ff = 0; ff < inf->fileCount; ++ff )
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tr_free( inf->files[ff].name );
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tr_free( inf->webseeds );
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tr_free( inf->pieces );
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tr_free( inf->files );
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tr_free( inf->comment );
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tr_free( inf->creator );
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tr_free( inf->torrent );
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tr_free( inf->name );
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for( i = 0; i < inf->trackerCount; ++i )
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{
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tr_free( inf->trackers[i].announce );
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tr_free( inf->trackers[i].scrape );
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}
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tr_free( inf->trackers );
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memset( inf, '\0', sizeof( tr_info ) );
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}
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void
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tr_metainfoRemoveSaved( const tr_handle * handle,
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const tr_info * inf )
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{
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char * filename;
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filename = getTorrentFilename( handle, inf );
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unlink( filename );
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tr_free( filename );
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filename = getOldTorrentFilename( handle, inf );
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unlink( filename );
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tr_free( filename );
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}
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