mirror of
https://github.com/transmission/transmission
synced 2024-12-26 17:47:37 +00:00
694 lines
20 KiB
C
694 lines
20 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 <ctype.h> /* isspace */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.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 "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 "trcompat.h" /* strlcpy */
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#include "utils.h"
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/***********************************************************************
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* Local prototypes
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**********************************************************************/
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static int getannounce( tr_info * inf, tr_benc * meta );
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static char * announceToScrape( const char * announce );
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static int parseFiles( tr_info * inf, tr_benc * name,
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tr_benc * files, tr_benc * length );
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/***
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****
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***/
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#define WANTBYTES( want, got ) \
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if( (want) > (got) ) { return; } else { (got) -= (want); }
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static void
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strlcat_utf8( void * dest, const void * src, size_t len, char skip )
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{
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char * s = dest;
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const char * append = src;
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const char * p;
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/* don't overwrite the nul at the end */
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len--;
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/* Go to the end of the destination string */
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while( s[0] )
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{
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s++;
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len--;
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}
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/* Now start appending, converting on the fly if necessary */
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for( p = append; p[0]; )
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{
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/* skip over the requested character */
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if( skip == p[0] )
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{
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p++;
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continue;
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}
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if( !( p[0] & 0x80 ) )
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{
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/* ASCII character */
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WANTBYTES( 1, len );
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*(s++) = *(p++);
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continue;
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}
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if( ( p[0] & 0xE0 ) == 0xC0 && ( p[1] & 0xC0 ) == 0x80 )
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{
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/* 2-bytes UTF-8 character */
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WANTBYTES( 2, len );
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*(s++) = *(p++); *(s++) = *(p++);
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continue;
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}
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if( ( p[0] & 0xF0 ) == 0xE0 && ( p[1] & 0xC0 ) == 0x80 &&
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( p[2] & 0xC0 ) == 0x80 )
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{
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/* 3-bytes UTF-8 character */
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WANTBYTES( 3, len );
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*(s++) = *(p++); *(s++) = *(p++);
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*(s++) = *(p++);
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continue;
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}
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if( ( p[0] & 0xF8 ) == 0xF0 && ( p[1] & 0xC0 ) == 0x80 &&
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( p[2] & 0xC0 ) == 0x80 && ( p[3] & 0xC0 ) == 0x80 )
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{
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/* 4-bytes UTF-8 character */
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WANTBYTES( 4, len );
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*(s++) = *(p++); *(s++) = *(p++);
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*(s++) = *(p++); *(s++) = *(p++);
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continue;
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}
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/* ISO 8859-1 -> UTF-8 conversion */
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WANTBYTES( 2, len );
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*(s++) = 0xC0 | ( ( *p & 0xFF ) >> 6 );
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*(s++) = 0x80 | ( *(p++) & 0x3F );
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}
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}
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static void
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savedname( const tr_handle * handle,
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char * name,
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size_t len,
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const char * hash )
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{
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const char * torDir = tr_getTorrentDir( handle );
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if( !handle->tag )
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{
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tr_buildPath( name, len, torDir, hash, NULL );
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}
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else
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{
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char base[1024];
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snprintf( base, sizeof(base), "%s-%s", hash, handle->tag );
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tr_buildPath( name, len, torDir, base, NULL );
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}
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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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tr_piece_index_t i;
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tr_benc * beInfo, * val, * val2;
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tr_benc * meta = (tr_benc *) meta_in;
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char buf[4096];
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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(( beInfo = tr_bencDictFindType( meta, "info", TYPE_DICT )))
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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_free( str );
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}
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else
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{
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tr_err( _( "Missing metadata entry \"%s\"" ), "info" );
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return TR_EINVALID;
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}
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tr_sha1_to_hex( inf->hashString, inf->hash );
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savedname( handle, buf, sizeof( buf ), inf->hashString );
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tr_free( inf->torrent );
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inf->torrent = tr_strdup( buf );
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/* comment */
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memset( buf, '\0', sizeof( buf ) );
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val = tr_bencDictFindFirst( meta, "comment.utf-8", "comment", NULL );
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if( tr_bencIsString( val ) )
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strlcat_utf8( buf, val->val.s.s, sizeof( buf ), 0 );
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tr_free( inf->comment );
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inf->comment = tr_strdup( buf );
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/* creator */
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memset( buf, '\0', sizeof( buf ) );
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val = tr_bencDictFindFirst( meta, "created by.utf-8", "created by", NULL );
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if( tr_bencIsString( val ) )
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strlcat_utf8( buf, val->val.s.s, sizeof( buf ), 0 );
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tr_free( inf->creator );
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inf->creator = tr_strdup( buf );
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/* Date created */
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inf->dateCreated = 0;
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val = tr_bencDictFind( meta, "creation date" );
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if( tr_bencIsInt( val ) )
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inf->dateCreated = val->val.i;
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/* Private torrent */
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val = tr_bencDictFind( beInfo, "private" );
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val2 = tr_bencDictFind( meta, "private" );
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if( ( tr_bencIsInt(val) && val->val.i ) ||
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( tr_bencIsInt(val2) && val2->val.i ) )
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{
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inf->isPrivate = 1;
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}
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/* Piece length */
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val = tr_bencDictFind( beInfo, "piece length" );
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if( !tr_bencIsInt( val ) )
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{
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if( val )
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tr_err( _( "Invalid metadata entry \"%s\"" ), "piece length" );
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else
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tr_err( _( "Missing metadata entry \"%s\"" ), "piece length" );
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goto fail;
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}
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inf->pieceSize = val->val.i;
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/* Hashes */
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val = tr_bencDictFind( beInfo, "pieces" );
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if( !tr_bencIsString( val ) )
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{
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if( val )
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tr_err( _( "Invalid metadata entry \"%s\"" ), "pieces" );
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else
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tr_err( _( "Missing metadata entry \"%s\"" ), "pieces" );
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goto fail;
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}
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if( val->val.s.i % SHA_DIGEST_LENGTH )
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{
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tr_err( _( "Invalid metadata entry \"%s\"" ), "pieces" );
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goto fail;
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}
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inf->pieceCount = val->val.s.i / SHA_DIGEST_LENGTH;
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inf->pieces = calloc ( inf->pieceCount, sizeof(tr_piece) );
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for ( i=0; i<inf->pieceCount; ++i )
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{
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memcpy (inf->pieces[i].hash, &val->val.s.s[i*SHA_DIGEST_LENGTH], SHA_DIGEST_LENGTH);
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}
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/* get file or top directory name */
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val = tr_bencDictFindFirst( beInfo, "name.utf-8", "name", NULL );
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if( parseFiles( inf, tr_bencDictFindFirst( beInfo,
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"name.utf-8", "name", NULL ),
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tr_bencDictFind( beInfo, "files" ),
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tr_bencDictFind( beInfo, "length" ) ) )
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{
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goto fail;
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}
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if( !inf->fileCount || !inf->totalSize )
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{
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tr_err( _( "Torrent is corrupt" ) ); /* the content is missing! */
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goto fail;
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}
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/* TODO add more tests so we don't crash on weird 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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{
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tr_err( _( "Torrent is corrupt" ) ); /* size of hashes and files don't match */
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goto fail;
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}
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/* get announce or announce-list */
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if( getannounce( inf, meta ) )
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{
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goto fail;
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}
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return TR_OK;
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fail:
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tr_metainfoFree( inf );
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return TR_EINVALID;
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}
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void tr_metainfoFree( tr_info * inf )
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{
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tr_file_index_t ff;
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int i, j;
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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->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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tr_free( inf->primaryAddress );
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for( i=0; i<inf->trackerTiers; ++i ) {
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for( j=0; j<inf->trackerList[i].count; ++j )
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tr_trackerInfoClear( &inf->trackerList[i].list[j] );
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tr_free( inf->trackerList[i].list );
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}
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tr_free( inf->trackerList );
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memset( inf, '\0', sizeof(tr_info) );
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}
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static int
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getfile( char ** setme, const char * prefix, tr_benc * name )
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{
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const char ** list;
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int ii, jj;
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char buf[4096];
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if( !tr_bencIsList( name ) )
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return TR_EINVALID;
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list = calloc( name->val.l.count, sizeof( list[0] ) );
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if( !list )
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return TR_EINVALID;
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for( ii = jj = 0; name->val.l.count > ii; ii++ )
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{
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tr_benc * dir = &name->val.l.vals[ii];
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if( !tr_bencIsString( dir ) )
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continue;
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if( 0 == strcmp( "..", dir->val.s.s ) )
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{
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if( 0 < jj )
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{
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jj--;
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}
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}
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else if( 0 != strcmp( ".", dir->val.s.s ) )
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{
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list[jj] = dir->val.s.s;
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jj++;
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}
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}
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if( 0 == jj )
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{
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free( list );
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return TR_EINVALID;
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}
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memset( buf, 0, sizeof( buf ) );
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strlcat_utf8( buf, prefix, sizeof(buf), 0 );
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for( ii = 0; jj > ii; ii++ )
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{
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strlcat_utf8( buf, TR_PATH_DELIMITER_STR, sizeof(buf), 0 );
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strlcat_utf8( buf, list[ii], sizeof(buf), TR_PATH_DELIMITER );
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}
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free( list );
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tr_free( *setme );
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*setme = tr_strdup( buf );
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return TR_OK;
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}
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static int getannounce( tr_info * inf, tr_benc * meta )
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{
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tr_benc * val, * urlval;
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char * address, * announce;
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int ii, jj, port, random;
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tr_tracker_info * sublist;
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void * swapping;
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/* Announce-list */
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val = tr_bencDictFind( meta, "announce-list" );
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if( tr_bencIsList(val) && 0 < val->val.l.count )
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{
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inf->trackerTiers = 0;
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inf->trackerList = calloc( val->val.l.count,
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sizeof( inf->trackerList[0] ) );
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/* iterate through the announce-list's tiers */
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for( ii = 0; ii < val->val.l.count; ii++ )
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{
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int subcount = 0;
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tr_benc * subval = &val->val.l.vals[ii];
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if( !tr_bencIsList(subval) || 0 >= subval->val.l.count )
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continue;
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sublist = calloc( subval->val.l.count, sizeof( sublist[0] ) );
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/* iterate through the tier's items */
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for( jj = 0; jj < subval->val.l.count; jj++ )
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{
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tr_tracker_info tmp;
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urlval = &subval->val.l.vals[jj];
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if( TYPE_STR != urlval->type ||
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tr_trackerInfoInit( &tmp, urlval->val.s.s, urlval->val.s.i ) )
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{
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continue;
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}
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if( !inf->primaryAddress ) {
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char buf[1024];
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snprintf( buf, sizeof(buf), "%s:%d", tmp.address, tmp.port );
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inf->primaryAddress = tr_strdup( buf );
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}
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/* place the item info in a random location in the sublist */
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random = tr_rand( subcount + 1 );
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if( random != subcount )
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sublist[subcount] = sublist[random];
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sublist[random] = tmp;
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subcount++;
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}
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/* just use sublist as-is if it's full */
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if( subcount == subval->val.l.count )
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{
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inf->trackerList[inf->trackerTiers].list = sublist;
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inf->trackerList[inf->trackerTiers].count = subcount;
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inf->trackerTiers++;
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}
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/* if we skipped some of the tier's items then trim the sublist */
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else if( 0 < subcount )
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{
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inf->trackerList[inf->trackerTiers].list = calloc( subcount, sizeof( sublist[0] ) );
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memcpy( inf->trackerList[inf->trackerTiers].list, sublist,
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sizeof( sublist[0] ) * subcount );
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inf->trackerList[inf->trackerTiers].count = subcount;
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inf->trackerTiers++;
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free( sublist );
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}
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/* drop the whole sublist if we didn't use any items at all */
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else
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{
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free( sublist );
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}
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}
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/* did we use any of the tiers? */
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if( 0 == inf->trackerTiers )
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{
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tr_inf( _( "Invalid metadata entry \"%s\"" ), "announce-list" );
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free( inf->trackerList );
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inf->trackerList = NULL;
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}
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/* trim unused sublist pointers */
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else if( inf->trackerTiers < val->val.l.count )
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{
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swapping = inf->trackerList;
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inf->trackerList = calloc( inf->trackerTiers,
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sizeof( inf->trackerList[0] ) );
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memcpy( inf->trackerList, swapping,
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sizeof( inf->trackerList[0] ) * inf->trackerTiers );
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free( swapping );
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}
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}
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/* Regular announce value */
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val = tr_bencDictFind( meta, "announce" );
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if( !tr_bencIsString( val ) )
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{
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tr_err( _( "Missing metadata entry \"%s\"" ), "announce" );
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return TR_EINVALID;
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}
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if( !inf->trackerTiers )
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{
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char buf[4096], *pch;
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strlcpy( buf, val->val.s.s, sizeof( buf ) );
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pch = buf;
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while( isspace( *pch ) )
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++pch;
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if( tr_httpParseURL( pch, -1, &address, &port, &announce ) )
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{
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tr_err( _( "Invalid announce URL \"%s\"" ), val->val.s.s );
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return TR_EINVALID;
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}
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sublist = calloc( 1, sizeof( sublist[0] ) );
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sublist[0].address = address;
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sublist[0].port = port;
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sublist[0].announce = announce;
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sublist[0].scrape = announceToScrape( announce );
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inf->trackerList = calloc( 1, sizeof( inf->trackerList[0] ) );
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inf->trackerList[0].list = sublist;
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inf->trackerList[0].count = 1;
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inf->trackerTiers = 1;
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if( !inf->primaryAddress ) {
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char buf[1024];
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snprintf( buf, sizeof(buf), "%s:%d", sublist[0].address, sublist[0].port );
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inf->primaryAddress = tr_strdup( buf );
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}
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}
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return TR_OK;
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}
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static char * announceToScrape( const char * announce )
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{
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char old[] = "announce";
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int oldlen = 8;
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char new[] = "scrape";
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int newlen = 6;
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char * slash, * scrape;
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size_t scrapelen, used;
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slash = strrchr( announce, '/' );
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if( NULL == slash )
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{
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return NULL;
|
|
}
|
|
slash++;
|
|
|
|
if( 0 != strncmp( slash, old, oldlen ) )
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
scrapelen = strlen( announce ) - oldlen + newlen;
|
|
scrape = calloc( scrapelen + 1, 1 );
|
|
if( NULL == scrape )
|
|
{
|
|
return NULL;
|
|
}
|
|
assert( ( size_t )( slash - announce ) < scrapelen );
|
|
memcpy( scrape, announce, slash - announce );
|
|
used = slash - announce;
|
|
strncat( scrape, new, scrapelen - used );
|
|
used += newlen;
|
|
assert( strlen( scrape ) == used );
|
|
if( used < scrapelen )
|
|
{
|
|
assert( strlen( slash + oldlen ) == scrapelen - used );
|
|
strncat( scrape, slash + oldlen, scrapelen - used );
|
|
}
|
|
|
|
return scrape;
|
|
}
|
|
|
|
int
|
|
tr_trackerInfoInit( tr_tracker_info * info,
|
|
const char * address,
|
|
int address_len )
|
|
{
|
|
int ret = tr_httpParseURL( address, address_len,
|
|
&info->address,
|
|
&info->port,
|
|
&info->announce );
|
|
if( !ret )
|
|
info->scrape = announceToScrape( info->announce );
|
|
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
tr_trackerInfoClear( tr_tracker_info * info )
|
|
{
|
|
tr_free( info->address );
|
|
tr_free( info->announce );
|
|
tr_free( info->scrape );
|
|
memset( info, '\0', sizeof(tr_tracker_info) );
|
|
}
|
|
|
|
void
|
|
tr_metainfoRemoveSaved( const tr_handle * handle,
|
|
const char * hashString )
|
|
{
|
|
char file[MAX_PATH_LENGTH];
|
|
savedname( handle, file, sizeof file, hashString );
|
|
unlink( file );
|
|
}
|
|
|
|
/* Save a copy of the torrent file in the saved torrent directory */
|
|
int
|
|
tr_metainfoSave( const tr_handle * handle,
|
|
const char * hash,
|
|
const uint8_t * buf,
|
|
size_t buflen )
|
|
{
|
|
char path[MAX_PATH_LENGTH];
|
|
FILE * file;
|
|
|
|
savedname( handle, path, sizeof path, hash );
|
|
file = fopen( path, "wb+" );
|
|
if( !file )
|
|
{
|
|
tr_err( _( "Couldn't open \"%1$s\": %2$s" ), path, tr_strerror( errno ) );
|
|
return TR_EINVALID;
|
|
}
|
|
fseek( file, 0, SEEK_SET );
|
|
if( fwrite( buf, 1, buflen, file ) != buflen )
|
|
{
|
|
tr_err( _( "Couldn't save file \"%1$s\": %2$s" ), path, tr_strerror( errno ) );
|
|
fclose( file );
|
|
return TR_EINVALID;
|
|
}
|
|
fclose( file );
|
|
|
|
return TR_OK;
|
|
}
|
|
|
|
static int
|
|
parseFiles( tr_info * inf, tr_benc * name,
|
|
tr_benc * files, tr_benc * length )
|
|
{
|
|
tr_benc * item, * path;
|
|
int ii;
|
|
|
|
if( !tr_bencIsString( name ) )
|
|
{
|
|
if( name )
|
|
tr_err( _( "Invalid metadata entry \"%s\"" ), "name" );
|
|
else
|
|
tr_err( _( "Missing metadata entry \"%s\"" ), "name" );
|
|
return TR_EINVALID;
|
|
}
|
|
|
|
tr_free( inf->name );
|
|
inf->name = tr_strdup( name->val.s.s );
|
|
if( !inf->name || !*inf->name )
|
|
{
|
|
tr_err( _( "Invalid metadata entry \"%s\"" ), "name" );
|
|
return TR_EINVALID;
|
|
}
|
|
inf->totalSize = 0;
|
|
|
|
if( tr_bencIsList( files ) )
|
|
{
|
|
/* Multi-file mode */
|
|
inf->isMultifile = 1;
|
|
inf->fileCount = files->val.l.count;
|
|
inf->files = calloc( inf->fileCount, sizeof( inf->files[0] ) );
|
|
|
|
if( !inf->files )
|
|
return TR_EINVALID;
|
|
|
|
for( ii = 0; files->val.l.count > ii; ii++ )
|
|
{
|
|
item = &files->val.l.vals[ii];
|
|
path = tr_bencDictFindFirst( item, "path.utf-8", "path", NULL );
|
|
if( getfile( &inf->files[ii].name, inf->name, path ) )
|
|
{
|
|
if( path )
|
|
tr_err( _( "Invalid metadata entry \"%s\"" ), "path" );
|
|
else
|
|
tr_err( _( "Missing metadata entry \"%s\"" ), "path" );
|
|
return TR_EINVALID;
|
|
}
|
|
length = tr_bencDictFind( item, "length" );
|
|
if( !tr_bencIsInt( length ) )
|
|
{
|
|
if( length )
|
|
tr_err( _( "Invalid metadata entry \"%s\"" ), "length" );
|
|
else
|
|
tr_err( _( "Missing metadata entry \"%s\"" ), "length" );
|
|
return TR_EINVALID;
|
|
}
|
|
inf->files[ii].length = length->val.i;
|
|
inf->totalSize += length->val.i;
|
|
}
|
|
}
|
|
else if( tr_bencIsInt( length ) )
|
|
{
|
|
char buf[4096];
|
|
|
|
/* Single-file mode */
|
|
inf->isMultifile = 0;
|
|
inf->fileCount = 1;
|
|
inf->files = calloc( 1, sizeof( inf->files[0] ) );
|
|
|
|
if( !inf->files )
|
|
return TR_EINVALID;
|
|
|
|
memset( buf, 0, sizeof( buf ) );
|
|
strlcat_utf8( buf, name->val.s.s, sizeof(buf), TR_PATH_DELIMITER );
|
|
tr_free( inf->files[0].name );
|
|
inf->files[0].name = tr_strdup( buf );
|
|
|
|
inf->files[0].length = length->val.i;
|
|
inf->totalSize += length->val.i;
|
|
}
|
|
else
|
|
{
|
|
tr_err( _( "Invalid or missing metadata entries \"length\" and \"files\"" ) );
|
|
}
|
|
|
|
return TR_OK;
|
|
}
|