283 lines
8.6 KiB
C
283 lines
8.6 KiB
C
/******************************************************************************
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* Copyright (c) 2005 Eric Petit
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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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/***********************************************************************
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* Local prototypes
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**********************************************************************/
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static void strcatUTF8( char *, 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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{
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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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char * s, * s2, * s3;
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int i;
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struct stat sb;
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snprintf( inf->torrent, MAX_PATH_LENGTH, path );
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if( stat( path, &sb ) )
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{
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fprintf( stderr, "Could not stat file (%s)\n", 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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fprintf( stderr, "Not a regular file (%s)\n", path );
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return 1;
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}
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if( sb.st_size > 2097152 )
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{
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tr_err( "Torrent file is too big (%d bytes)", 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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fprintf( stderr, "Could not open file (%s)\n", 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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fprintf( stderr, "Read error (%s)\n", 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, &meta, NULL ) )
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{
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fprintf( stderr, "Error while parsing bencoded data\n" );
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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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fprintf( stderr, "Could not find \"info\" dictionary\n" );
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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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/* No that we got the hash, we won't need this anymore */
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free( buf );
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if( !( val = tr_bencDictFind( &meta, "announce" ) ) )
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{
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fprintf( stderr, "No \"announce\" entry\n" );
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tr_bencFree( &meta );
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return 1;
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}
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/* Skip spaces */
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s3 = val->val.s.s;
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while( *s3 && *s3 == ' ' )
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{
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s3++;
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}
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/* Parse announce URL */
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if( strncmp( s3, "http://", 7 ) )
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{
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fprintf( stderr, "Invalid announce URL (%s)\n",
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inf->trackerAddress );
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tr_bencFree( &meta );
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return 1;
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}
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s = strchr( s3 + 7, ':' );
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s2 = strchr( s3 + 7, '/' );
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if( s && s < s2 )
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{
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memcpy( inf->trackerAddress, s3 + 7,
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(long) s - (long) s3 - 7 );
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inf->trackerPort = atoi( s + 1 );
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}
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else if( s2 )
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{
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memcpy( inf->trackerAddress, s3 + 7,
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(long) s2 - (long) s3 - 7 );
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inf->trackerPort = 80;
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}
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else
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{
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fprintf( stderr, "Invalid announce URL (%s)\n",
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inf->trackerAddress );
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tr_bencFree( &meta );
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return 1;
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}
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snprintf( inf->trackerAnnounce, MAX_PATH_LENGTH, s2 );
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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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fprintf( stderr, "No \"piece length\" entry\n" );
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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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fprintf( stderr, "Invalid \"piece\" string (size is %d)\n",
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val->val.s.i );
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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" );
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strcatUTF8( inf->name, val->val.s.s );
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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" );
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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->fileCount = 1;
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inf->files = calloc( sizeof( tr_file_t ), 1 );
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val = tr_bencDictFind( beInfo, "name" );
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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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fprintf( stderr, "Size of hashes and files don't match\n" );
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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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/***********************************************************************
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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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static void strcatUTF8( char * s, 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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}
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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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*(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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*(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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*(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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*(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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*(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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