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transmission/libtransmission/metainfo.c

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/*
* This file Copyright (C) 2009-2010 Mnemosyne LLC
trackers[trackerCount].id = 0;
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h> /* unlink, stat */
#include <event.h> /* struct evbuffer */
#include "transmission.h"
#include "session.h"
#include "bencode.h"
#include "crypto.h" /* tr_sha1 */
#include "metainfo.h"
#include "platform.h"
#include "utils.h"
/***
****
***/
char*
tr_metainfoGetBasename( const tr_info * inf )
{
char *ret, *pch, *name;
name = tr_strdup( inf->name );
for( pch=name; pch && *pch; ++pch )
if( *pch == '/' )
*pch = '_';
ret = tr_strdup_printf( "%s.%16.16s", name, inf->hashString );
tr_free( name );
return ret;
}
static char*
getTorrentFilename( const tr_session * session,
const tr_info * inf )
{
char * base = tr_metainfoGetBasename( inf );
char * filename = tr_strdup_printf( "%s" TR_PATH_DELIMITER_STR "%s.torrent",
tr_getTorrentDir( session ), base );
tr_free( base );
return filename;
}
static char*
getOldTorrentFilename( const tr_session * session, const tr_info * inf )
{
int i;
char * path;
struct stat sb;
const int tagCount = 5;
const char * tags[] = { "beos", "cli", "daemon", "macosx", "wx" };
/* test the beos, cli, daemon, macosx, wx tags */
for( i=0; i<tagCount; ++i ) {
path = tr_strdup_printf( "%s%c%s-%s", tr_getTorrentDir( session ), '/', inf->hashString, tags[i] );
if( !stat( path, &sb ) && ( ( sb.st_mode & S_IFMT ) == S_IFREG ) )
return path;
tr_free( path );
}
/* test a non-tagged file */
path = tr_buildPath( tr_getTorrentDir( session ), inf->hashString, NULL );
if( !stat( path, &sb ) && ( ( sb.st_mode & S_IFMT ) == S_IFREG ) )
return path;
tr_free( path );
/* return the -gtk form by default, since that's the most common case.
don't bother testing stat() on it since this is the last candidate
and we don't want to return NULL anyway */
return tr_strdup_printf( "%s%c%s-%s", tr_getTorrentDir( session ), '/', inf->hashString, "gtk" );
}
/* this is for really old versions of T and will probably be removed someday */
void
tr_metainfoMigrate( tr_session * session,
tr_info * inf )
{
struct stat new_sb;
char * name = getTorrentFilename( session, inf );
if( stat( name, &new_sb ) || ( ( new_sb.st_mode & S_IFMT ) != S_IFREG ) )
{
char * old_name = getOldTorrentFilename( session, inf );
size_t contentLen;
uint8_t * content;
tr_mkdirp( tr_getTorrentDir( session ), 0777 );
if( ( content = tr_loadFile( old_name, &contentLen ) ) )
{
FILE * out;
errno = 0;
out = fopen( name, "wb+" );
if( !out )
{
tr_nerr( inf->name, _( "Couldn't create \"%1$s\": %2$s" ),
name, tr_strerror( errno ) );
}
else
{
if( fwrite( content, sizeof( uint8_t ), contentLen, out )
== contentLen )
{
tr_free( inf->torrent );
inf->torrent = tr_strdup( name );
tr_sessionSetTorrentFile( session, inf->hashString, name );
unlink( old_name );
}
fclose( out );
}
}
tr_free( content );
tr_free( old_name );
}
tr_free( name );
}
/***
****
***/
static tr_bool
path_is_suspicious( const char * path )
{
return ( path == NULL )
|| ( strstr( path, "../" ) != NULL );
}
static tr_bool
getfile( char ** setme, const char * root, tr_benc * path )
{
tr_bool success = FALSE;
if( tr_bencIsList( path ) )
{
int i;
const int n = tr_bencListSize( path );
struct evbuffer * buf = evbuffer_new( );
evbuffer_add( buf, root, strlen( root ) );
for( i = 0; i < n; ++i )
{
const char * str;
if( tr_bencGetStr( tr_bencListChild( path, i ), &str ) )
{
evbuffer_add( buf, TR_PATH_DELIMITER_STR, 1 );
evbuffer_add( buf, str, strlen( str ) );
}
}
*setme = tr_utf8clean( (char*)EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ), NULL );
/* fprintf( stderr, "[%s]\n", *setme ); */
evbuffer_free( buf );
success = TRUE;
}
if( ( *setme != NULL ) && path_is_suspicious( *setme ) )
{
tr_free( *setme );
*setme = NULL;
success = FALSE;
}
return success;
}
static const char*
parseFiles( tr_info * inf, tr_benc * files, const tr_benc * length )
{
int64_t len;
inf->totalSize = 0;
if( tr_bencIsList( files ) ) /* multi-file mode */
{
tr_file_index_t i;
inf->isMultifile = 1;
inf->fileCount = tr_bencListSize( files );
inf->files = tr_new0( tr_file, inf->fileCount );
for( i = 0; i < inf->fileCount; ++i )
{
tr_benc * file;
tr_benc * path;
file = tr_bencListChild( files, i );
if( !tr_bencIsDict( file ) )
return "files";
if( !tr_bencDictFindList( file, "path.utf-8", &path ) )
if( !tr_bencDictFindList( file, "path", &path ) )
return "path";
if( !getfile( &inf->files[i].name, inf->name, path ) )
return "path";
if( !tr_bencDictFindInt( file, "length", &len ) )
return "length";
inf->files[i].length = len;
inf->totalSize += len;
}
}
else if( tr_bencGetInt( length, &len ) ) /* single-file mode */
{
if( path_is_suspicious( inf->name ) )
return "path";
inf->isMultifile = 0;
inf->fileCount = 1;
inf->files = tr_new0( tr_file, 1 );
inf->files[0].name = tr_strdup( inf->name );
inf->files[0].length = len;
inf->totalSize += len;
}
else
{
return "length";
}
return NULL;
}
static char *
tr_convertAnnounceToScrape( const char * announce )
{
char * scrape = NULL;
const char * s;
/* To derive the scrape URL use the following steps:
* Begin with the announce URL. Find the last '/' in it.
* If the text immediately following that '/' isn't 'announce'
* it will be taken as a sign that that tracker doesn't support
* the scrape convention. If it does, substitute 'scrape' for
* 'announce' to find the scrape page. */
if( ( ( s = strrchr( announce, '/' ) ) ) && !strncmp( ++s, "announce", 8 ) )
{
const char * prefix = announce;
const size_t prefix_len = s - announce;
const char * suffix = s + 8;
const size_t suffix_len = strlen( suffix );
const size_t alloc_len = prefix_len + 6 + suffix_len + 1;
char * walk = scrape = tr_new( char, alloc_len );
memcpy( walk, prefix, prefix_len ); walk += prefix_len;
memcpy( walk, "scrape", 6 ); walk += 6;
memcpy( walk, suffix, suffix_len ); walk += suffix_len;
*walk++ = '\0';
assert( walk - scrape == (int)alloc_len );
}
return scrape;
}
static const char*
getannounce( tr_info * inf, tr_benc * meta )
{
const char * str;
tr_tracker_info * trackers = NULL;
int trackerCount = 0;
tr_benc * tiers;
/* Announce-list */
if( tr_bencDictFindList( meta, "announce-list", &tiers ) )
{
int n;
int i, j, validTiers;
const int numTiers = tr_bencListSize( tiers );
n = 0;
for( i = 0; i < numTiers; ++i )
n += tr_bencListSize( tr_bencListChild( tiers, i ) );
trackers = tr_new0( tr_tracker_info, n );
for( i = 0, validTiers = 0; i < numTiers; ++i )
{
tr_benc * tier = tr_bencListChild( tiers, i );
const int tierSize = tr_bencListSize( tier );
tr_bool anyAdded = FALSE;
for( j = 0; j < tierSize; ++j )
{
if( tr_bencGetStr( tr_bencListChild( tier, j ), &str ) )
{
char * url = tr_strstrip( tr_strdup( str ) );
if( tr_urlIsValidTracker( url ) )
{
tr_tracker_info * t = trackers + trackerCount;
t->tier = validTiers;
t->announce = tr_strdup( url );
t->scrape = tr_convertAnnounceToScrape( url );
t->id = trackerCount;
anyAdded = TRUE;
++trackerCount;
}
tr_free( url );
}
}
if( anyAdded )
++validTiers;
}
/* did we use any of the tiers? */
if( !trackerCount )
{
tr_free( trackers );
trackers = NULL;
}
}
/* Regular announce value */
if( !trackerCount
&& tr_bencDictFindStr( meta, "announce", &str ) )
{
char * url = tr_strstrip( tr_strdup( str ) );
if( tr_urlIsValidTracker( url ) )
{
trackers = tr_new0( tr_tracker_info, 1 );
trackers[trackerCount].tier = 0;
trackers[trackerCount].announce = tr_strdup( url );
trackers[trackerCount].scrape = tr_convertAnnounceToScrape( url );
trackers[trackerCount].id = 0;
trackerCount++;
/*fprintf( stderr, "single announce: [%s]\n", url );*/
}
tr_free( url );
}
inf->trackers = trackers;
inf->trackerCount = trackerCount;
return NULL;
}
static void
geturllist( tr_info * inf,
tr_benc * meta )
{
tr_benc * urls;
if( tr_bencDictFindList( meta, "url-list", &urls ) )
{
int i;
const char * url;
const int n = tr_bencListSize( urls );
inf->webseedCount = 0;
inf->webseeds = tr_new0( char*, n );
for( i = 0; i < n; ++i )
if( tr_bencGetStr( tr_bencListChild( urls, i ), &url ) )
inf->webseeds[inf->webseedCount++] = tr_strdup( url );
}
}
static int
is_rfc2396_alnum( char ch )
{
return ( '0' <= ch && ch <= '9' )
|| ( 'A' <= ch && ch <= 'Z' )
|| ( 'a' <= ch && ch <= 'z' );
}
static void
escape( char * out, const uint8_t * in, size_t in_len ) /* rfc2396 */
{
const uint8_t *end = in + in_len;
while( in != end )
if( is_rfc2396_alnum( *in ) )
*out++ = (char) *in++;
else
out += tr_snprintf( out, 4, "%%%02X", (unsigned int)*in++ );
*out = '\0';
}
static const char*
tr_metainfoParseImpl( const tr_session * session,
tr_info * inf,
tr_bool * hasInfoDict,
int * infoDictLength,
const tr_benc * meta_in )
{
int64_t i;
size_t raw_len;
const char * str;
const uint8_t * raw;
tr_benc * d;
tr_benc * infoDict = NULL;
tr_benc * meta = (tr_benc *) meta_in;
tr_bool err;
tr_bool b;
tr_bool isMagnet = FALSE;
/* info_hash: urlencoded 20-byte SHA1 hash of the value of the info key
* from the Metainfo file. Note that the value will be a bencoded
* dictionary, given the definition of the info key above. */
b = tr_bencDictFindDict( meta, "info", &infoDict );
if( hasInfoDict != NULL )
*hasInfoDict = b;
if( !b )
{
/* no info dictionary... is this a magnet link? */
if( tr_bencDictFindDict( meta, "magnet-info", &d ) )
{
isMagnet = TRUE;
/* get the info-hash */
if( !tr_bencDictFindRaw( d, "info_hash", &raw, &raw_len ) )
return "info_hash";
if( raw_len != SHA_DIGEST_LENGTH )
return "info_hash";
memcpy( inf->hash, raw, raw_len );
tr_sha1_to_hex( inf->hashString, inf->hash );
escape( inf->hashEscaped, inf->hash, SHA_DIGEST_LENGTH );
/* maybe get the display name */
if( tr_bencDictFindStr( d, "display-name", &str ) ) {
tr_free( inf->name );
inf->name = tr_strdup( str );
}
}
else /* not a magnet link and has no info dict... */
{
return "info";
}
}
else
{
int len;
char * bstr = tr_bencToStr( infoDict, TR_FMT_BENC, &len );
tr_sha1( inf->hash, bstr, len, NULL );
tr_sha1_to_hex( inf->hashString, inf->hash );
escape( inf->hashEscaped, inf->hash, SHA_DIGEST_LENGTH );
if( infoDictLength != NULL )
*infoDictLength = len;
tr_free( bstr );
}
/* name */
if( !isMagnet ) {
if( !tr_bencDictFindStr( infoDict, "name.utf-8", &str ) )
if( !tr_bencDictFindStr( infoDict, "name", &str ) )
str = "";
if( !str || !*str )
return "name";
tr_free( inf->name );
inf->name = tr_utf8clean( str, -1, &err );
}
/* comment */
if( !tr_bencDictFindStr( meta, "comment.utf-8", &str ) )
if( !tr_bencDictFindStr( meta, "comment", &str ) )
str = "";
tr_free( inf->comment );
inf->comment = tr_utf8clean( str, -1, &err );
/* created by */
if( !tr_bencDictFindStr( meta, "created by.utf-8", &str ) )
if( !tr_bencDictFindStr( meta, "created by", &str ) )
str = "";
tr_free( inf->creator );
inf->creator = tr_utf8clean( str, -1, &err );
/* creation date */
if( !tr_bencDictFindInt( meta, "creation date", &i ) )
i = 0;
inf->dateCreated = i;
/* private */
if( !tr_bencDictFindInt( infoDict, "private", &i ) )
if( !tr_bencDictFindInt( meta, "private", &i ) )
i = 0;
inf->isPrivate = i != 0;
/* piece length */
if( !isMagnet ) {
if( !tr_bencDictFindInt( infoDict, "piece length", &i ) || ( i < 1 ) )
return "piece length";
inf->pieceSize = i;
}
/* pieces */
if( !isMagnet ) {
if( !tr_bencDictFindRaw( infoDict, "pieces", &raw, &raw_len ) )
return "pieces";
if( raw_len % SHA_DIGEST_LENGTH )
return "pieces";
inf->pieceCount = raw_len / SHA_DIGEST_LENGTH;
inf->pieces = tr_new0( tr_piece, inf->pieceCount );
for( i = 0; i < inf->pieceCount; ++i )
memcpy( inf->pieces[i].hash, &raw[i * SHA_DIGEST_LENGTH],
SHA_DIGEST_LENGTH );
}
/* files */
if( !isMagnet ) {
if( ( str = parseFiles( inf, tr_bencDictFind( infoDict, "files" ),
tr_bencDictFind( infoDict, "length" ) ) ) )
return str;
if( !inf->fileCount || !inf->totalSize )
return "files";
if( (uint64_t) inf->pieceCount !=
( inf->totalSize + inf->pieceSize - 1 ) / inf->pieceSize )
return "files";
}
/* get announce or announce-list */
if( ( str = getannounce( inf, meta ) ) )
return str;
/* get the url-list */
geturllist( inf, meta );
/* filename of Transmission's copy */
tr_free( inf->torrent );
inf->torrent = session ? getTorrentFilename( session, inf ) : NULL;
return NULL;
}
tr_bool
tr_metainfoParse( const tr_session * session,
const tr_benc * meta_in,
tr_info * inf,
tr_bool * hasInfoDict,
int * infoDictLength )
{
const char * badTag = tr_metainfoParseImpl( session,
inf,
hasInfoDict,
infoDictLength,
meta_in );
const tr_bool success = badTag == NULL;
if( badTag )
{
tr_nerr( inf->name, _( "Invalid metadata entry \"%s\"" ), badTag );
tr_metainfoFree( inf );
}
return success;
}
void
tr_metainfoFree( tr_info * inf )
{
int i;
tr_file_index_t ff;
for( i = 0; i < inf->webseedCount; ++i )
tr_free( inf->webseeds[i] );
for( ff = 0; ff < inf->fileCount; ++ff )
tr_free( inf->files[ff].name );
tr_free( inf->webseeds );
tr_free( inf->pieces );
tr_free( inf->files );
tr_free( inf->comment );
tr_free( inf->creator );
tr_free( inf->torrent );
tr_free( inf->name );
for( i = 0; i < inf->trackerCount; ++i )
{
tr_free( inf->trackers[i].announce );
tr_free( inf->trackers[i].scrape );
}
tr_free( inf->trackers );
memset( inf, '\0', sizeof( tr_info ) );
}
void
tr_metainfoRemoveSaved( const tr_session * session,
const tr_info * inf )
{
char * filename;
filename = getTorrentFilename( session, inf );
unlink( filename );
tr_free( filename );
filename = getOldTorrentFilename( session, inf );
unlink( filename );
tr_free( filename );
}
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