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transmission/libtransmission/resume.c

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/*
* This file Copyright (C) 2008-2009 Charles Kerr <charles@transmissionbt.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.
*
* $Id$
*/
#include <unistd.h> /* unlink */
#include <string.h>
#include "transmission.h"
#include "session.h"
#include "bencode.h"
#include "completion.h"
#include "fastresume.h"
#include "peer-mgr.h" /* pex */
#include "platform.h" /* tr_getResumeDir */
#include "resume.h"
#include "torrent.h"
#include "utils.h" /* tr_buildPath */
#define KEY_ACTIVITY_DATE "activity-date"
#define KEY_ADDED_DATE "added-date"
#define KEY_CORRUPT "corrupt"
#define KEY_DONE_DATE "done-date"
#define KEY_DOWNLOAD_DIR "destination"
#define KEY_DND "dnd"
#define KEY_DOWNLOADED "downloaded"
#define KEY_MAX_PEERS "max-peers"
#define KEY_PAUSED "paused"
#define KEY_PEERS "peers"
#define KEY_PEERS6 "peers6"
#define KEY_PRIORITY "priority"
#define KEY_PROGRESS "progress"
#define KEY_SPEEDLIMIT "speed-limit"
#define KEY_UPLOADED "uploaded"
#define KEY_SPEEDLIMIT_DOWN_SPEED "down-speed"
#define KEY_SPEEDLIMIT_DOWN_MODE "down-mode"
#define KEY_SPEEDLIMIT_UP_SPEED "up-speed"
#define KEY_SPEEDLIMIT_UP_MODE "up-mode"
#define KEY_PROGRESS_MTIMES "mtimes"
#define KEY_PROGRESS_BITFIELD "bitfield"
static char*
getResumeFilename( const tr_torrent * tor )
{
return tr_strdup_printf( "%s%c%s.%16.16s.resume",
tr_getResumeDir( tor->session ),
TR_PATH_DELIMITER,
tor->info.name,
tor->info.hashString );
}
/***
****
***/
static void
savePeers( tr_benc * dict,
const tr_torrent * tor )
{
tr_pex * pex = NULL;
int count = tr_peerMgrGetPeers( tor->session->peerMgr,
tor->info.hash, &pex, TR_AF_INET );
if( count > 0 )
tr_bencDictAddRaw( dict, KEY_PEERS, pex, sizeof( tr_pex ) * count );
tr_free( pex );
pex = NULL;
count = tr_peerMgrGetPeers( tor->session->peerMgr, tor->info.hash, &pex,
TR_AF_INET6 );
if( count > 0 )
tr_bencDictAddRaw( dict, KEY_PEERS6, pex, sizeof( tr_pex ) * count );
tr_free( pex );
}
static uint64_t
loadPeers( tr_benc * dict,
tr_torrent * tor )
{
uint64_t ret = 0;
const uint8_t * str;
size_t len;
if( tr_bencDictFindRaw( dict, KEY_PEERS, &str, &len ) )
{
int i;
const int count = len / sizeof( tr_pex );
for( i = 0; i < count; ++i )
{
tr_pex pex;
memcpy( &pex, str + ( i * sizeof( tr_pex ) ), sizeof( tr_pex ) );
tr_peerMgrAddPex( tor->session->peerMgr,
tor->info.hash, TR_PEER_FROM_CACHE, &pex );
}
tr_tordbg( tor, "Loaded %d IPv4 peers from resume file", count );
ret = TR_FR_PEERS;
}
if( tr_bencDictFindRaw( dict, KEY_PEERS6, &str, &len ) )
{
int i;
const int count = len / sizeof( tr_pex );
for( i = 0; i < count; ++i )
{
tr_pex pex;
memcpy( &pex, str + ( i * sizeof( tr_pex ) ), sizeof( tr_pex ) );
tr_peerMgrAddPex( tor->session->peerMgr,
tor->info.hash, TR_PEER_FROM_CACHE, &pex );
}
tr_tordbg( tor, "Loaded %d IPv6 peers from resume file", count );
ret = TR_FR_PEERS;
}
return ret;
}
/***
****
***/
static void
saveDND( tr_benc * dict,
const tr_torrent * tor )
{
const tr_info * inf = tr_torrentInfo( tor );
const tr_file_index_t n = inf->fileCount;
tr_file_index_t i;
tr_benc * list;
list = tr_bencDictAddList( dict, KEY_DND, n );
for( i = 0; i < n; ++i )
tr_bencListAddInt( list, inf->files[i].dnd ? 1 : 0 );
}
static uint64_t
loadDND( tr_benc * dict,
tr_torrent * tor )
{
uint64_t ret = 0;
tr_info * inf = &tor->info;
const tr_file_index_t n = inf->fileCount;
tr_benc * list = NULL;
if( tr_bencDictFindList( dict, KEY_DND, &list )
&& ( tr_bencListSize( list ) == n ) )
{
int64_t tmp;
tr_file_index_t * dl = tr_new( tr_file_index_t, n );
tr_file_index_t * dnd = tr_new( tr_file_index_t, n );
tr_file_index_t i, dlCount = 0, dndCount = 0;
for( i = 0; i < n; ++i )
{
if( tr_bencGetInt( tr_bencListChild( list, i ), &tmp ) && tmp )
dnd[dndCount++] = i;
else
dl[dlCount++] = i;
}
if( dndCount )
{
tr_torrentInitFileDLs ( tor, dnd, dndCount, FALSE );
tr_tordbg( tor, "Resume file found %d files listed as dnd",
dndCount );
}
if( dlCount )
{
tr_torrentInitFileDLs ( tor, dl, dlCount, TRUE );
tr_tordbg( tor,
"Resume file found %d files marked for download",
dlCount );
}
tr_free( dnd );
tr_free( dl );
ret = TR_FR_PRIORITY;
}
else
{
tr_tordbg(
tor,
"Couldn't load DND flags. dnd list (%p) has %zu children; torrent has %d files",
list, tr_bencListSize( list ), (int)n );
}
return ret;
}
/***
****
***/
static void
savePriorities( tr_benc * dict,
const tr_torrent * tor )
{
const tr_info * inf = tr_torrentInfo( tor );
const tr_file_index_t n = inf->fileCount;
tr_file_index_t i;
tr_benc * list;
list = tr_bencDictAddList( dict, KEY_PRIORITY, n );
for( i = 0; i < n; ++i )
tr_bencListAddInt( list, inf->files[i].priority );
}
static uint64_t
loadPriorities( tr_benc * dict,
tr_torrent * tor )
{
uint64_t ret = 0;
tr_info * inf = &tor->info;
const tr_file_index_t n = inf->fileCount;
tr_benc * list;
if( tr_bencDictFindList( dict, KEY_PRIORITY, &list )
&& ( tr_bencListSize( list ) == n ) )
{
int64_t priority;
tr_file_index_t i;
for( i = 0; i < n; ++i )
if( tr_bencGetInt( tr_bencListChild( list, i ), &priority ) )
tr_torrentInitFilePriority( tor, i, priority );
ret = TR_FR_PRIORITY;
}
return ret;
}
/***
****
***/
static void
saveSpeedLimits( tr_benc * dict,
const tr_torrent * tor )
{
tr_benc * d = tr_bencDictAddDict( dict, KEY_SPEEDLIMIT, 4 );
tr_bencDictAddInt( d, KEY_SPEEDLIMIT_DOWN_SPEED,
tr_torrentGetSpeedLimit( tor, TR_DOWN ) );
tr_bencDictAddInt( d, KEY_SPEEDLIMIT_DOWN_MODE,
tr_torrentGetSpeedMode( tor, TR_DOWN ) );
tr_bencDictAddInt( d, KEY_SPEEDLIMIT_UP_SPEED,
tr_torrentGetSpeedLimit( tor, TR_UP ) );
tr_bencDictAddInt( d, KEY_SPEEDLIMIT_UP_MODE,
tr_torrentGetSpeedMode( tor, TR_UP ) );
}
static uint64_t
loadSpeedLimits( tr_benc * dict,
tr_torrent * tor )
{
uint64_t ret = 0;
tr_benc * d;
if( tr_bencDictFindDict( dict, KEY_SPEEDLIMIT, &d ) )
{
int64_t i;
if( tr_bencDictFindInt( d, KEY_SPEEDLIMIT_DOWN_SPEED, &i ) )
tr_torrentSetSpeedLimit( tor, TR_DOWN, i );
if( tr_bencDictFindInt( d, KEY_SPEEDLIMIT_DOWN_MODE, &i ) )
tr_torrentSetSpeedMode( tor, TR_DOWN, i );
if( tr_bencDictFindInt( d, KEY_SPEEDLIMIT_UP_SPEED, &i ) )
tr_torrentSetSpeedLimit( tor, TR_UP, i );
if( tr_bencDictFindInt( d, KEY_SPEEDLIMIT_UP_MODE, &i ) )
tr_torrentSetSpeedMode( tor, TR_UP, i );
ret = TR_FR_SPEEDLIMIT;
}
return ret;
}
/***
****
***/
static void
saveProgress( tr_benc * dict,
const tr_torrent * tor )
{
size_t i, n;
time_t * mtimes;
tr_benc * p;
tr_benc * m;
const tr_bitfield * bitfield;
p = tr_bencDictAdd( dict, KEY_PROGRESS );
tr_bencInitDict( p, 2 );
/* add the mtimes */
mtimes = tr_torrentGetMTimes( tor, &n );
m = tr_bencDictAddList( p, KEY_PROGRESS_MTIMES, n );
for( i = 0; i < n; ++i )
{
if( !tr_torrentIsFileChecked( tor, i ) )
mtimes[i] = ~(time_t)0; /* force a recheck */
tr_bencListAddInt( m, mtimes[i] );
}
/* add the bitfield */
bitfield = tr_cpBlockBitfield( &tor->completion );
tr_bencDictAddRaw( p, KEY_PROGRESS_BITFIELD,
bitfield->bits, bitfield->byteCount );
/* cleanup */
tr_free( mtimes );
}
static uint64_t
loadProgress( tr_benc * dict,
tr_torrent * tor )
{
uint64_t ret = 0;
tr_benc * p;
if( tr_bencDictFindDict( dict, KEY_PROGRESS, &p ) )
{
const uint8_t * raw;
size_t rawlen;
tr_benc * m;
size_t n;
time_t * curMTimes = tr_torrentGetMTimes( tor, &n );
if( tr_bencDictFindList( p, KEY_PROGRESS_MTIMES, &m )
&& ( n == tor->info.fileCount )
&& ( n == tr_bencListSize( m ) ) )
{
size_t i;
for( i = 0; i < n; ++i )
{
int64_t tmp;
if( !tr_bencGetInt( tr_bencListChild( m, i ), &tmp ) )
{
tr_tordbg(
tor,
"File #%zu needs to be verified - couldn't find benc entry",
i );
tr_torrentSetFileChecked( tor, i, FALSE );
}
else
{
const time_t t = (time_t) tmp;
if( t == curMTimes[i] )
tr_torrentSetFileChecked( tor, i, TRUE );
else
{
tr_tordbg(
tor,
"File #%zu needs to be verified - times %lu and %lu don't match",
i, t, curMTimes[i] );
tr_torrentSetFileChecked( tor, i, FALSE );
}
}
}
}
else
{
tr_torrentUncheck( tor );
tr_tordbg(
tor, "Torrent needs to be verified - unable to find mtimes" );
}
if( tr_bencDictFindRaw( p, KEY_PROGRESS_BITFIELD, &raw, &rawlen ) )
{
tr_bitfield tmp;
tmp.byteCount = rawlen;
tmp.bitCount = tmp.byteCount * 8;
tmp.bits = (uint8_t*) raw;
if( !tr_cpBlockBitfieldSet( &tor->completion, &tmp ) )
{
tr_torrentUncheck( tor );
tr_tordbg(
tor,
"Torrent needs to be verified - error loading bitfield" );
}
}
else
{
tr_torrentUncheck( tor );
tr_tordbg(
tor,
"Torrent needs to be verified - unable to find bitfield" );
}
tr_free( curMTimes );
ret = TR_FR_PROGRESS;
}
return ret;
}
/***
****
***/
void
tr_torrentSaveResume( const tr_torrent * tor )
{
tr_benc top;
char * filename;
if( !tor )
return;
tr_bencInitDict( &top, 14 );
tr_bencDictAddInt( &top, KEY_ACTIVITY_DATE,
tor->activityDate );
tr_bencDictAddInt( &top, KEY_ADDED_DATE,
tor->addedDate );
tr_bencDictAddInt( &top, KEY_CORRUPT,
tor->corruptPrev + tor->corruptCur );
tr_bencDictAddInt( &top, KEY_DONE_DATE,
tor->doneDate );
tr_bencDictAddStr( &top, KEY_DOWNLOAD_DIR,
tor->downloadDir );
tr_bencDictAddInt( &top, KEY_DOWNLOADED,
tor->downloadedPrev + tor->downloadedCur );
tr_bencDictAddInt( &top, KEY_UPLOADED,
tor->uploadedPrev + tor->uploadedCur );
tr_bencDictAddInt( &top, KEY_MAX_PEERS,
tor->maxConnectedPeers );
tr_bencDictAddInt( &top, KEY_PAUSED,
tor->isRunning ? 0 : 1 );
savePeers( &top, tor );
savePriorities( &top, tor );
saveDND( &top, tor );
saveProgress( &top, tor );
saveSpeedLimits( &top, tor );
filename = getResumeFilename( tor );
tr_bencSaveFile( filename, &top );
tr_free( filename );
tr_bencFree( &top );
}
static uint64_t
loadFromFile( tr_torrent * tor,
uint64_t fieldsToLoad )
{
int64_t i;
const char * str;
uint64_t fieldsLoaded = 0;
char * filename;
tr_benc top;
filename = getResumeFilename( tor );
if( tr_bencLoadFile( filename, &top ) )
{
tr_tordbg( tor, "Couldn't read \"%s\"; trying old format.",
filename );
fieldsLoaded = tr_fastResumeLoad( tor, fieldsToLoad );
if( ( fieldsLoaded != 0 ) && ( fieldsToLoad == ~(uint64_t)0 ) )
{
tr_torrentSaveResume( tor );
tr_fastResumeRemove( tor );
tr_tordbg( tor, "Migrated resume file to \"%s\"", filename );
}
tr_free( filename );
return fieldsLoaded;
}
tr_tordbg( tor, "Read resume file \"%s\"", filename );
if( ( fieldsToLoad & TR_FR_CORRUPT )
&& tr_bencDictFindInt( &top, KEY_CORRUPT, &i ) )
{
tor->corruptPrev = i;
fieldsLoaded |= TR_FR_CORRUPT;
}
if( ( fieldsToLoad & ( TR_FR_PROGRESS | TR_FR_DOWNLOAD_DIR ) )
&& ( tr_bencDictFindStr( &top, KEY_DOWNLOAD_DIR, &str ) )
&& ( str && *str ) )
{
tr_free( tor->downloadDir );
tor->downloadDir = tr_strdup( str );
fieldsLoaded |= TR_FR_DOWNLOAD_DIR;
}
if( ( fieldsToLoad & TR_FR_DOWNLOADED )
&& tr_bencDictFindInt( &top, KEY_DOWNLOADED, &i ) )
{
tor->downloadedPrev = i;
fieldsLoaded |= TR_FR_DOWNLOADED;
}
if( ( fieldsToLoad & TR_FR_UPLOADED )
&& tr_bencDictFindInt( &top, KEY_UPLOADED, &i ) )
{
tor->uploadedPrev = i;
fieldsLoaded |= TR_FR_UPLOADED;
}
if( ( fieldsToLoad & TR_FR_MAX_PEERS )
&& tr_bencDictFindInt( &top, KEY_MAX_PEERS, &i ) )
{
tor->maxConnectedPeers = i;
fieldsLoaded |= TR_FR_MAX_PEERS;
}
if( ( fieldsToLoad & TR_FR_RUN )
&& tr_bencDictFindInt( &top, KEY_PAUSED, &i ) )
{
tor->isRunning = i ? 0 : 1;
fieldsLoaded |= TR_FR_RUN;
}
if( ( fieldsToLoad & TR_FR_ADDED_DATE )
&& tr_bencDictFindInt( &top, KEY_ADDED_DATE, &i ) )
{
tor->addedDate = i;
fieldsLoaded |= TR_FR_ADDED_DATE;
}
if( ( fieldsToLoad & TR_FR_DONE_DATE )
&& tr_bencDictFindInt( &top, KEY_DONE_DATE, &i ) )
{
tor->doneDate = i;
fieldsLoaded |= TR_FR_DONE_DATE;
}
if( ( fieldsToLoad & TR_FR_ACTIVITY_DATE )
&& tr_bencDictFindInt( &top, KEY_ACTIVITY_DATE, &i ) )
{
tor->activityDate = i;
fieldsLoaded |= TR_FR_ACTIVITY_DATE;
}
if( fieldsToLoad & TR_FR_PEERS )
fieldsLoaded |= loadPeers( &top, tor );
if( fieldsToLoad & TR_FR_PRIORITY )
fieldsLoaded |= loadPriorities( &top, tor );
if( fieldsToLoad & TR_FR_PROGRESS )
fieldsLoaded |= loadProgress( &top, tor );
if( fieldsToLoad & TR_FR_DND )
fieldsLoaded |= loadDND( &top, tor );
if( fieldsToLoad & TR_FR_SPEEDLIMIT )
fieldsLoaded |= loadSpeedLimits( &top, tor );
tr_bencFree( &top );
tr_free( filename );
return fieldsLoaded;
}
static uint64_t
setFromCtor( tr_torrent * tor,
uint64_t fields,
const tr_ctor * ctor,
int mode )
{
uint64_t ret = 0;
if( fields & TR_FR_RUN )
{
uint8_t isPaused;
if( !tr_ctorGetPaused( ctor, mode, &isPaused ) )
{
tor->isRunning = !isPaused;
ret |= TR_FR_RUN;
}
}
if( fields & TR_FR_MAX_PEERS )
if( !tr_ctorGetPeerLimit( ctor, mode, &tor->maxConnectedPeers ) )
ret |= TR_FR_MAX_PEERS;
if( fields & TR_FR_DOWNLOAD_DIR )
{
const char * path;
if( !tr_ctorGetDownloadDir( ctor, mode, &path ) && path && *path )
{
ret |= TR_FR_DOWNLOAD_DIR;
tr_free( tor->downloadDir );
tor->downloadDir = tr_strdup( path );
}
}
return ret;
}
static uint64_t
useManditoryFields( tr_torrent * tor,
uint64_t fields,
const tr_ctor * ctor )
{
return setFromCtor( tor, fields, ctor, TR_FORCE );
}
static uint64_t
useFallbackFields( tr_torrent * tor,
uint64_t fields,
const tr_ctor * ctor )
{
return setFromCtor( tor, fields, ctor, TR_FALLBACK );
}
uint64_t
tr_torrentLoadResume( tr_torrent * tor,
uint64_t fieldsToLoad,
const tr_ctor * ctor )
{
uint64_t ret = 0;
ret |= useManditoryFields( tor, fieldsToLoad, ctor );
fieldsToLoad &= ~ret;
ret |= loadFromFile( tor, fieldsToLoad );
fieldsToLoad &= ~ret;
ret |= useFallbackFields( tor, fieldsToLoad, ctor );
return ret;
}
void
tr_torrentRemoveResume( const tr_torrent * tor )
{
char * filename = getResumeFilename( tor );
unlink( filename );
tr_fastResumeRemove( tor );
tr_free( filename );
}
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