transmission/libtransmission/makemeta.c

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/*
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* This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.com>
*
* 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.
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*
* $Id$
*/
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#include <assert.h>
#include <errno.h>
#include <stdio.h> /* FILE, snprintf, stderr */
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#include <stdlib.h> /* qsort */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
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#include <libgen.h> /* dirname, basename */
#include <dirent.h>
#include "crypto.h" /* tr_sha1 */
#include "transmission.h"
#include "bencode.h"
#include "makemeta.h"
#include "platform.h" /* threads, locks */
#include "utils.h" /* buildpath */
#include "version.h"
/****
*****
****/
struct FileList
{
struct FileList * next;
uint64_t size;
char * filename;
};
static struct FileList*
getFiles( const char * dir,
const char * base,
struct FileList * list )
{
int i;
char buf[MAX_PATH_LENGTH];
struct stat sb;
DIR * odir = NULL;
sb.st_size = 0;
tr_buildPath( buf, sizeof(buf), dir, base, NULL );
i = stat( buf, &sb );
if( i ) {
tr_err( _( "Torrent Creator is skipping file \"%s\": %s" ), buf, tr_strerror(errno));
return list;
}
if ( S_ISDIR( sb.st_mode ) && (( odir = opendir ( buf ) )) )
{
struct dirent *d;
for (d = readdir( odir ); d!=NULL; d=readdir( odir ) )
if( d->d_name && d->d_name[0]!='.' ) /* skip dotfiles, ., and .. */
list = getFiles( buf, d->d_name, list );
closedir( odir );
}
else if( S_ISREG( sb.st_mode ) )
{
struct FileList * node = tr_new( struct FileList, 1 );
node->size = sb.st_size;
if( ( buf[0]=='.' ) && ( buf[1]=='/' ) )
node->filename = tr_strdup( buf + 2 );
else
node->filename = tr_strdup( buf );
node->next = list;
list = node;
}
return list;
}
static int
bestPieceSize( uint64_t totalSize )
{
static const uint64_t GiB = 1073741824;
static const uint64_t MiB = 1048576;
static const uint64_t KiB = 1024;
if( totalSize >= (1*GiB) ) return MiB;
if( totalSize >= (512*MiB) ) return (512*KiB);
if( totalSize >= (350*MiB) ) return (256*KiB);
if( totalSize >= (150*MiB) ) return (128*KiB);
if( totalSize >= (50*MiB) ) return (64*KiB);
return (32*KiB); /* less than 50 meg */
}
static int
builderFileCompare ( const void * va, const void * vb)
{
const tr_metainfo_builder_file * a = va;
const tr_metainfo_builder_file * b = vb;
return strcmp( a->filename, b->filename );
}
tr_metainfo_builder*
tr_metaInfoBuilderCreate( tr_handle * handle, const char * topFile )
{
int i;
struct FileList * files;
struct FileList * walk;
tr_metainfo_builder * ret = tr_new0( tr_metainfo_builder, 1 );
ret->top = tr_strdup( topFile );
ret->handle = handle;
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{
struct stat sb;
stat( topFile, &sb );
ret->isSingleFile = !S_ISDIR( sb.st_mode );
}
/* build a list of files containing topFile and,
if it's a directory, all of its children */
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{
char *dir, *base;
char dirbuf[MAX_PATH_LENGTH];
char basebuf[MAX_PATH_LENGTH];
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tr_strlcpy( dirbuf, topFile, sizeof( dirbuf ) );
tr_strlcpy( basebuf, topFile, sizeof( basebuf ) );
dir = dirname( dirbuf );
base = basename( basebuf );
files = getFiles( dir, base, NULL );
}
for( walk=files; walk!=NULL; walk=walk->next )
++ret->fileCount;
ret->files = tr_new0( tr_metainfo_builder_file, ret->fileCount );
for( i=0, walk=files; walk!=NULL; ++i )
{
struct FileList * tmp = walk;
tr_metainfo_builder_file * file = &ret->files[i];
walk = walk->next;
file->filename = tmp->filename;
file->size = tmp->size;
ret->totalSize += tmp->size;
tr_free( tmp );
}
qsort( ret->files,
ret->fileCount,
sizeof(tr_metainfo_builder_file),
builderFileCompare );
ret->pieceSize = bestPieceSize( ret->totalSize );
ret->pieceCount = ret->pieceSize
? (int)( ret->totalSize / ret->pieceSize)
: 0;
if( ret->totalSize % ret->pieceSize )
++ret->pieceCount;
return ret;
}
void
tr_metaInfoBuilderFree( tr_metainfo_builder * builder )
{
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if( builder )
{
tr_file_index_t t;
int i;
for( t=0; t<builder->fileCount; ++t )
tr_free( builder->files[t].filename );
tr_free( builder->files );
tr_free( builder->top );
tr_free( builder->comment );
for( i=0; i<builder->trackerCount; ++i )
tr_free( builder->trackers[i].announce );
tr_free( builder->trackers );
tr_free( builder->outputFile );
tr_free( builder );
}
}
/****
*****
****/
static uint8_t*
getHashInfo ( tr_metainfo_builder * b )
{
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uint32_t fileIndex = 0;
uint8_t *ret = tr_new0( uint8_t, SHA_DIGEST_LENGTH * b->pieceCount );
uint8_t *walk = ret;
uint8_t *buf;
uint64_t totalRemain;
uint64_t off = 0;
FILE * fp;
if( !b->totalSize )
return ret;
buf = tr_new( uint8_t, b->pieceSize );
b->pieceIndex = 0;
totalRemain = b->totalSize;
fp = fopen( b->files[fileIndex].filename, "rb" );
if( !fp ) {
b->my_errno = errno;
snprintf( b->errfile, sizeof( b->errfile ), b->files[fileIndex].filename );
b->result = TR_MAKEMETA_IO_READ;
tr_free( ret );
return NULL;
}
while ( totalRemain )
{
uint8_t *bufptr = buf;
const uint64_t thisPieceSize =
MIN( (uint32_t)b->pieceSize, totalRemain );
uint64_t pieceRemain = thisPieceSize;
assert( b->pieceIndex < b->pieceCount );
while( pieceRemain )
{
const uint64_t n_this_pass =
MIN( (b->files[fileIndex].size - off), pieceRemain );
fread( bufptr, 1, n_this_pass, fp );
bufptr += n_this_pass;
off += n_this_pass;
pieceRemain -= n_this_pass;
if( off == b->files[fileIndex].size ) {
off = 0;
fclose( fp );
fp = NULL;
if( ++fileIndex < b->fileCount ) {
fp = fopen( b->files[fileIndex].filename, "rb" );
if( !fp ) {
b->my_errno = errno;
snprintf( b->errfile, sizeof( b->errfile ), b->files[fileIndex].filename );
b->result = TR_MAKEMETA_IO_READ;
tr_free( ret );
return NULL;
}
}
}
}
assert( bufptr-buf == (int)thisPieceSize );
assert( pieceRemain == 0 );
tr_sha1( walk, buf, thisPieceSize, NULL );
walk += SHA_DIGEST_LENGTH;
if( b->abortFlag ) {
b->result = TR_MAKEMETA_CANCELLED;
break;
}
totalRemain -= thisPieceSize;
++b->pieceIndex;
}
assert( b->abortFlag || (walk-ret == (int)(SHA_DIGEST_LENGTH*b->pieceCount)) );
assert( b->abortFlag || !totalRemain );
if( fp != NULL )
fclose( fp );
tr_free( buf );
return ret;
}
static void
getFileInfo( const char * topFile,
const tr_metainfo_builder_file * file,
tr_benc * uninitialized_length,
tr_benc * uninitialized_path )
{
const char *pch, *prev;
const size_t topLen = strlen(topFile) + 1; /* +1 for '/' */
int n;
/* get the file size */
tr_bencInitInt( uninitialized_length, file->size );
/* the path list */
n = 1;
for( pch=file->filename+topLen; *pch; ++pch )
if (*pch == TR_PATH_DELIMITER)
++n;
tr_bencInitList( uninitialized_path, n );
for( prev=pch=file->filename+topLen; ; ++pch )
{
char buf[MAX_PATH_LENGTH];
if (*pch && *pch!=TR_PATH_DELIMITER )
continue;
memcpy( buf, prev, pch-prev );
buf[pch-prev] = '\0';
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tr_bencListAddStr( uninitialized_path, buf );
prev = pch + 1;
if (!*pch)
break;
}
}
static void
makeInfoDict ( tr_benc * dict,
tr_metainfo_builder * builder )
{
uint8_t * pch;
char base[MAX_PATH_LENGTH];
tr_bencDictReserve( dict, 5 );
if ( builder->isSingleFile )
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tr_bencDictAddInt( dict, "length", builder->files[0].size );
else {
uint32_t i;
tr_benc * list = tr_bencDictAddList( dict, "files", builder->fileCount );
for( i=0; i<builder->fileCount; ++i ) {
tr_benc * dict = tr_bencListAddDict( list, 2 );
tr_benc * length = tr_bencDictAdd( dict, "length" );
tr_benc * pathVal = tr_bencDictAdd( dict, "path" );
getFileInfo( builder->top, &builder->files[i], length, pathVal );
}
}
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tr_strlcpy( base, builder->top, sizeof( base ) );
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tr_bencDictAddStr( dict, "name", basename( base ) );
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tr_bencDictAddInt( dict, "piece length", builder->pieceSize );
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if(( pch = getHashInfo( builder ))) {
tr_bencDictAddRaw( dict, "pieces", pch, SHA_DIGEST_LENGTH * builder->pieceCount );
tr_free( pch );
}
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tr_bencDictAddInt( dict, "private", builder->isPrivate ? 1 : 0 );
}
static void
tr_realMakeMetaInfo ( tr_metainfo_builder * builder )
{
int i;
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tr_benc top;
/* allow an empty set, but if URLs *are* listed, verify them. #814, #971 */
for( i=0; i<builder->trackerCount && !builder->result; ++i )
if( !tr_httpIsValidURL( builder->trackers[i].announce ) )
builder->result = TR_MAKEMETA_URL;
tr_bencInitDict( &top, 6 );
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if( !builder->result && builder->trackerCount )
{
int prevTier = -1;
tr_benc * tier = NULL;
tr_benc * announceList;
announceList = tr_bencDictAddList( &top, "announce-list", 0 );
for( i=0; i<builder->trackerCount; ++i ) {
if( prevTier != builder->trackers[i].tier ) {
prevTier = builder->trackers[i].tier;
tier = tr_bencListAddList( announceList, 0 );
}
tr_bencListAddStr( tier, builder->trackers[i].announce );
}
tr_bencDictAddStr( &top, "announce", builder->trackers[0].announce );
}
if( !builder->result && !builder->abortFlag )
{
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if( builder->comment && *builder->comment )
tr_bencDictAddStr( &top, "comment", builder->comment );
tr_bencDictAddStr( &top, "created by", TR_NAME "/" LONG_VERSION_STRING );
tr_bencDictAddInt( &top, "creation date", time(0) );
tr_bencDictAddStr( &top, "encoding", "UTF-8" );
makeInfoDict( tr_bencDictAddDict( &top, "info", 666 ), builder );
}
/* save the file */
if ( !builder->result && !builder->abortFlag ) {
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if( tr_bencSaveFile( builder->outputFile, &top ) ) {
builder->my_errno = errno;
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tr_strlcpy( builder->errfile, builder->outputFile, sizeof( builder->errfile ) );
builder->result = TR_MAKEMETA_IO_WRITE;
}
}
/* cleanup */
tr_bencFree( &top );
if( builder->abortFlag )
builder->result = TR_MAKEMETA_CANCELLED;
builder->isDone = 1;
}
/***
****
**** A threaded builder queue
****
***/
static tr_metainfo_builder * queue = NULL;
static tr_thread * workerThread = NULL;
static tr_lock* getQueueLock( tr_handle * h )
{
static tr_lock * lock = NULL;
tr_globalLock( h );
if( !lock )
lock = tr_lockNew( );
tr_globalUnlock( h );
return lock;
}
static void workerFunc( void * user_data )
{
tr_handle * handle = (tr_handle *) user_data;
for (;;)
{
tr_metainfo_builder * builder = NULL;
/* find the next builder to process */
tr_lock * lock = getQueueLock ( handle );
tr_lockLock( lock );
if( queue != NULL ) {
builder = queue;
queue = queue->nextBuilder;
}
tr_lockUnlock( lock );
/* if no builders, this worker thread is done */
if( builder == NULL )
break;
tr_realMakeMetaInfo ( builder );
}
workerThread = NULL;
}
void
tr_makeMetaInfo( tr_metainfo_builder * builder,
const char * outputFile,
const tr_tracker_info * trackers,
int trackerCount,
const char * comment,
int isPrivate )
{
int i;
tr_lock * lock;
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/* free any variables from a previous run */
for( i=0; i<builder->trackerCount; ++i )
tr_free( builder->trackers[i].announce );
tr_free( builder->trackers );
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tr_free( builder->comment );
tr_free( builder->outputFile );
/* initialize the builder variables */
builder->abortFlag = 0;
builder->isDone = 0;
builder->trackerCount = trackerCount;
builder->trackers = tr_new0( tr_tracker_info, builder->trackerCount );
for( i=0; i<builder->trackerCount; ++i ) {
builder->trackers[i].tier = trackers[i].tier;
builder->trackers[i].announce = tr_strdup( trackers[i].announce );
}
builder->comment = tr_strdup( comment );
builder->isPrivate = isPrivate;
if( outputFile && *outputFile )
builder->outputFile = tr_strdup( outputFile );
else {
char out[MAX_PATH_LENGTH];
snprintf( out, sizeof(out), "%s.torrent", builder->top);
builder->outputFile = tr_strdup( out );
}
/* enqueue the builder */
lock = getQueueLock ( builder->handle );
tr_lockLock( lock );
builder->nextBuilder = queue;
queue = builder;
if( !workerThread )
workerThread = tr_threadNew( workerFunc, builder->handle, "makeMeta" );
tr_lockUnlock( lock );
}