498 lines
16 KiB
C
498 lines
16 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2006 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 "transmission.h"
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#define TORRENT_MAX_SIZE (5*1024*1024)
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/***********************************************************************
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* Local prototypes
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**********************************************************************/
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static int getannounce( tr_info_t * inf, benc_val_t * meta );
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#define strcatUTF8( dst, src) _strcatUTF8( (dst), sizeof( dst ) - 1, (src) )
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static void _strcatUTF8( char *, int, char * );
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/***********************************************************************
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* tr_metainfoParse
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***********************************************************************
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*
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**********************************************************************/
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int tr_metainfoParse( tr_info_t * inf, const char * path,
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const char * savedHash, int saveCopy )
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{
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FILE * file;
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char * buf;
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benc_val_t meta, * beInfo, * list, * val;
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int i;
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struct stat sb;
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assert( NULL == path || NULL == savedHash );
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/* if savedHash isn't null, saveCopy should be false */
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assert( NULL == savedHash || !saveCopy );
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if( NULL != savedHash )
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{
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snprintf( inf->torrent, MAX_PATH_LENGTH, "%s/%s",
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tr_getTorrentsDirectory(), savedHash );
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path = inf->torrent;
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}
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if( stat( path, &sb ) )
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{
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tr_err( "Could not stat file (%s)", path );
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return 1;
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}
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if( ( sb.st_mode & S_IFMT ) != S_IFREG )
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{
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tr_err( "Not a regular file (%s)", path );
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return 1;
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}
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if( sb.st_size > TORRENT_MAX_SIZE )
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{
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tr_err( "Torrent file is too big (%d bytes)", (int)sb.st_size );
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return 1;
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}
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/* Load the torrent file into our buffer */
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file = fopen( path, "rb" );
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if( !file )
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{
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tr_err( "Could not open file (%s)", path );
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return 1;
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}
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buf = malloc( sb.st_size );
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fseek( file, 0, SEEK_SET );
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if( fread( buf, sb.st_size, 1, file ) != 1 )
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{
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tr_err( "Read error (%s)", path );
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free( buf );
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fclose( file );
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return 1;
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}
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fclose( file );
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/* Parse bencoded infos */
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if( tr_bencLoad( buf, sb.st_size, &meta, NULL ) )
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{
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tr_err( "Error while parsing bencoded data" );
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free( buf );
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return 1;
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}
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/* Get info hash */
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if( !( beInfo = tr_bencDictFind( &meta, "info" ) ) )
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{
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tr_err( "Could not find \"info\" dictionary" );
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tr_bencFree( &meta );
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free( buf );
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return 1;
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}
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SHA1( (uint8_t *) beInfo->begin,
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(long) beInfo->end - (long) beInfo->begin, inf->hash );
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for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
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{
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sprintf( inf->hashString + i * 2, "%02x", inf->hash[i] );
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}
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if( saveCopy )
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{
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/* Save a copy of the torrent file in the private torrent directory */
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snprintf( inf->torrent, MAX_PATH_LENGTH, "%s/%s",
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tr_getTorrentsDirectory(), inf->hashString );
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file = fopen( inf->torrent, "wb" );
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if( !file )
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{
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tr_err( "Could not open file (%s) (%s)",
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inf->torrent, strerror(errno) );
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tr_bencFree( &meta );
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free( buf );
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return 1;
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}
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fseek( file, 0, SEEK_SET );
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if( fwrite( buf, sb.st_size, 1, file ) != 1 )
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{
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tr_err( "Write error (%s)", inf->torrent );
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tr_bencFree( &meta );
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free( buf );
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fclose( file );
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return 1;
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}
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fclose( file );
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}
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else
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{
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snprintf( inf->torrent, MAX_PATH_LENGTH, "%s", path );
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}
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/* We won't need this anymore */
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free( buf );
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/* Comment info */
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if( ( val = tr_bencDictFind( &meta, "comment.utf-8" ) ) || ( val = tr_bencDictFind( &meta, "comment" ) ) )
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{
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strcatUTF8( inf->comment, val->val.s.s );
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}
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/* Creator info */
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if( ( val = tr_bencDictFind( &meta, "created by.utf-8" ) ) || ( val = tr_bencDictFind( &meta, "created by" ) ) )
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{
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strcatUTF8( inf->creator, val->val.s.s );
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}
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/* Date created */
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if( ( val = tr_bencDictFind( &meta, "creation date" ) ) )
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{
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inf->dateCreated = val->val.i;
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}
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else
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{
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inf->dateCreated = 0;
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}
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/* Private torrent */
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if( ( val = tr_bencDictFind( beInfo, "private" ) ) && TYPE_INT == val->type )
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{
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inf->privateTorrent = val->val.i;
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}
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/* Piece length */
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if( !( val = tr_bencDictFind( beInfo, "piece length" ) ) )
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{
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tr_err( "No \"piece length\" entry" );
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tr_bencFree( &meta );
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return 1;
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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( val->val.s.i % SHA_DIGEST_LENGTH )
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{
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tr_err( "Invalid \"piece\" string (size is %d)", val->val.s.i );
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tr_bencFree( &meta );
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return 1;
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}
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inf->pieceCount = val->val.s.i / SHA_DIGEST_LENGTH;
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inf->pieces = (uint8_t *) val->val.s.s; /* Ugly, but avoids a memcpy */
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val->val.s.s = NULL;
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/* TODO add more tests so we don't crash on weird files */
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inf->totalSize = 0;
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if( ( list = tr_bencDictFind( beInfo, "files" ) ) )
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{
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/* Multi-file mode */
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int j;
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val = tr_bencDictFind( beInfo, "name.utf-8" );
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if( NULL == val )
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{
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val = tr_bencDictFind( beInfo, "name" );
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}
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strcatUTF8( inf->name, val->val.s.s );
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inf->multifile = 1;
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inf->fileCount = list->val.l.count;
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inf->files = calloc( inf->fileCount * sizeof( tr_file_t ), 1 );
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for( i = 0; i < list->val.l.count; i++ )
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{
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val = tr_bencDictFind( &list->val.l.vals[i], "path.utf-8" );
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if( NULL == val )
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{
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val = tr_bencDictFind( &list->val.l.vals[i], "path" );
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}
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strcatUTF8( inf->files[i].name, inf->name );
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for( j = 0; j < val->val.l.count; j++ )
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{
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strcatUTF8( inf->files[i].name, "/" );
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strcatUTF8( inf->files[i].name,
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val->val.l.vals[j].val.s.s );
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}
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val = tr_bencDictFind( &list->val.l.vals[i], "length" );
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inf->files[i].length = val->val.i;
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inf->totalSize += val->val.i;
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}
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}
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else
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{
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/* Single-file mode */
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inf->multifile = 0;
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inf->fileCount = 1;
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inf->files = calloc( sizeof( tr_file_t ), 1 );
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val = tr_bencDictFind( beInfo, "name.utf-8" );
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if( NULL == val )
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{
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val = tr_bencDictFind( beInfo, "name" );
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}
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strcatUTF8( inf->files[0].name, val->val.s.s );
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strcatUTF8( inf->name, val->val.s.s );
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val = tr_bencDictFind( beInfo, "length" );
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inf->files[0].length = val->val.i;
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inf->totalSize += val->val.i;
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}
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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( "Size of hashes and files don't match" );
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tr_metainfoFree( inf );
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tr_bencFree( &meta );
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return 1;
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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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tr_metainfoFree( inf );
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tr_bencFree( &meta );
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return 1;
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}
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tr_bencFree( &meta );
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return 0;
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}
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void tr_metainfoFree( tr_info_t * inf )
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{
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int ii, jj;
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free( inf->pieces );
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free( inf->files );
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for( ii = 0; ii < inf->trackerTiers; ii++ )
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{
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for( jj = 0; jj < inf->trackerList[ii].count; jj++ )
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{
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free( inf->trackerList[ii].list[jj].address );
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free( inf->trackerList[ii].list[jj].announce );
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}
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free( inf->trackerList[ii].list );
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}
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free( inf->trackerList );
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}
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static int getannounce( tr_info_t * inf, benc_val_t * meta )
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{
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benc_val_t * val, * subval, * urlval;
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char * address, * announce;
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int ii, jj, port, random;
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tr_tracker_info_t * sublist;
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int subcount;
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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( NULL != val && TYPE_LIST == val->type && 0 < val->val.l.count )
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{
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inf->trackerTiers = 0;
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inf->trackerList = calloc( sizeof( inf->trackerList[0] ),
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val->val.l.count );
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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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subval = &val->val.l.vals[ii];
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if( TYPE_LIST != subval->type || 0 >= subval->val.l.count )
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{
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continue;
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}
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subcount = 0;
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sublist = calloc( sizeof( sublist[0] ), subval->val.l.count );
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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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urlval = &subval->val.l.vals[jj];
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if( TYPE_STR != urlval->type ||
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tr_httpParseUrl( urlval->val.s.s, urlval->val.s.i,
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&address, &port, &announce ) )
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{
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continue;
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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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{
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sublist[subcount] = sublist[random];
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}
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sublist[random].address = address;
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sublist[random].port = port;
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sublist[random].announce = announce;
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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( sizeof( sublist[0] ), subcount );
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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( "No valid entries in \"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( sizeof( inf->trackerList[0] ),
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inf->trackerTiers );
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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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if( 0 == inf->trackerTiers )
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{
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val = tr_bencDictFind( meta, "announce" );
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if( NULL == val || TYPE_STR != val->type )
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{
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tr_err( "No \"announce\" entry" );
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return 1;
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}
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if( tr_httpParseUrl( val->val.s.s, val->val.s.i,
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&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 1;
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}
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sublist = calloc( sizeof( sublist[0] ), 1 );
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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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inf->trackerList = calloc( sizeof( inf->trackerList[0] ), 1 );
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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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}
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return 0;
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}
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void tr_metainfoRemoveSaved( const char * hashString )
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{
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char file[MAX_PATH_LENGTH];
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snprintf( file, MAX_PATH_LENGTH, "%s/%s",
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tr_getTorrentsDirectory(), hashString );
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unlink(file);
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}
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/***********************************************************************
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* strcatUTF8
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***********************************************************************
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* According to the official specification, all strings in the torrent
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* file are supposed to be UTF-8 encoded. However, there are
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* non-compliant torrents around... If we encounter an invalid UTF-8
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* character, we assume it is ISO 8859-1 and convert it to UTF-8.
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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 _strcatUTF8( char * s, int len, char * append )
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{
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char * p;
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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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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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