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transmission/libtransmission/session.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2008 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <assert.h>
#include <stdlib.h>
#include <string.h> /* memcpy */
#include <signal.h>
#include <sys/types.h> /* stat */
#include <sys/stat.h> /* stat */
#include <unistd.h> /* stat */
#include <dirent.h> /* opendir */
#include "transmission.h"
#include "blocklist.h"
#include "fdlimit.h"
#include "list.h"
#include "metainfo.h" /* tr_metainfoFree */
#include "net.h"
#include "peer-mgr.h"
#include "platform.h" /* tr_lock */
#include "port-forwarding.h"
#include "ratecontrol.h"
#include "stats.h"
#include "torrent.h"
#include "tracker.h"
#include "trevent.h"
#include "utils.h"
#include "web.h"
/* Generate a peer id : "-TRxyzb-" + 12 random alphanumeric
characters, where x is the major version number, y is the
minor version number, z is the maintenance number, and b
designates beta (Azureus-style) */
uint8_t*
tr_peerIdNew( void )
{
int i;
int val;
int total = 0;
uint8_t * buf = tr_new( uint8_t, 21 );
const char * pool = "0123456789abcdefghijklmnopqrstuvwxyz";
const int base = 36;
memcpy( buf, PEERID_PREFIX, 8 );
for( i=8; i<19; ++i ) {
val = tr_rand( base );
total += val;
buf[i] = pool[val];
}
val = total % base ? base - (total % base) : 0;
total += val;
buf[19] = pool[val];
buf[20] = '\0';
return buf;
}
const uint8_t*
tr_getPeerId( void )
{
static uint8_t * id = NULL;
if( id == NULL )
id = tr_peerIdNew( );
return id;
}
/***
****
***/
tr_encryption_mode
tr_sessionGetEncryption( tr_session * session )
{
assert( session != NULL );
return session->encryptionMode;
}
void
tr_sessionSetEncryption( tr_session * session, tr_encryption_mode mode )
{
assert( session != NULL );
assert( mode==TR_ENCRYPTION_PREFERRED
|| mode==TR_ENCRYPTION_REQUIRED
|| mode==TR_PLAINTEXT_PREFERRED );
session->encryptionMode = mode;
}
/***
****
***/
static void metainfoLookupRescan( tr_handle * h );
tr_handle *
tr_initFull( const char * configDir,
const char * tag,
int isPexEnabled,
int isPortForwardingEnabled,
int publicPort,
int encryptionMode,
int isUploadLimitEnabled,
int uploadLimit,
int isDownloadLimitEnabled,
int downloadLimit,
int globalPeerLimit,
int messageLevel,
int isMessageQueueingEnabled,
int isBlocklistEnabled,
int peerSocketTOS )
{
tr_handle * h;
char filename[MAX_PATH_LENGTH];
#ifndef WIN32
/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
#endif
if( configDir == NULL )
configDir = tr_getDefaultConfigDir( );
tr_msgInit( );
tr_setMessageLevel( messageLevel );
tr_setMessageQueuing( isMessageQueueingEnabled );
h = tr_new0( tr_handle, 1 );
h->lock = tr_lockNew( );
h->isPexEnabled = isPexEnabled ? 1 : 0;
h->encryptionMode = encryptionMode;
h->peerSocketTOS = peerSocketTOS;
tr_setConfigDir( h, configDir );
tr_netInit(); /* must go before tr_eventInit */
tr_eventInit( h );
while( !h->events )
tr_wait( 50 );
h->tag = tr_strdup( tag );
h->peerMgr = tr_peerMgrNew( h );
/* Initialize rate and file descripts controls */
h->upload = tr_rcInit();
tr_rcSetLimit( h->upload, uploadLimit );
h->useUploadLimit = isUploadLimitEnabled;
h->download = tr_rcInit();
tr_rcSetLimit( h->download, downloadLimit );
h->useDownloadLimit = isDownloadLimitEnabled;
tr_fdInit( globalPeerLimit );
h->shared = tr_sharedInit( h, isPortForwardingEnabled, publicPort );
h->isPortSet = publicPort >= 0;
/* first %s is the application name
second %s is the version number */
tr_inf( _( "%s %s started" ), TR_NAME, LONG_VERSION_STRING );
/* initialize the blocklist */
tr_buildPath( filename, sizeof( filename ), h->configDir, "blocklists", NULL );
tr_mkdirp( filename, 0777 );
tr_buildPath( filename, sizeof( filename ), h->configDir, "blocklists", "level1.bin", NULL );
h->blocklist = _tr_blocklistNew( filename, isBlocklistEnabled );
tr_statsInit( h );
h->web = tr_webInit( h );
metainfoLookupRescan( h );
return h;
}
tr_handle *
tr_init( const char * configDir,
const char * tag )
{
return tr_initFull( configDir,
tag,
TR_DEFAULT_PEX_ENABLED,
TR_DEFAULT_PORT_FORWARDING_ENABLED,
-1, /* public port */
TR_ENCRYPTION_PREFERRED, /* encryption mode */
FALSE, /* use upload speed limit? */
-1, /* upload speed limit */
FALSE, /* use download speed limit? */
-1, /* download speed limit */
TR_DEFAULT_GLOBAL_PEER_LIMIT,
TR_MSG_INF, /* message level */
FALSE, /* is message queueing enabled? */
FALSE, /* is the blocklist enabled? */
TR_DEFAULT_PEER_SOCKET_TOS );
}
/***
****
***/
void
tr_globalLock( struct tr_handle * handle )
{
tr_lockLock( handle->lock );
}
void
tr_globalUnlock( struct tr_handle * handle )
{
tr_lockUnlock( handle->lock );
}
int
tr_globalIsLocked( const struct tr_handle * handle )
{
return handle && tr_lockHave( handle->lock );
}
/***********************************************************************
* tr_setBindPort
***********************************************************************
*
**********************************************************************/
struct bind_port_data
{
tr_handle * handle;
int port;
};
static void
tr_setBindPortImpl( void * vdata )
{
struct bind_port_data * data = vdata;
tr_handle * handle = data->handle;
const int port = data->port;
handle->isPortSet = 1;
tr_sharedSetPort( handle->shared, port );
tr_free( data );
}
void
tr_sessionSetPublicPort( tr_handle * handle, int port )
{
struct bind_port_data * data = tr_new( struct bind_port_data, 1 );
data->handle = handle;
data->port = port;
tr_runInEventThread( handle, tr_setBindPortImpl, data );
}
int
tr_sessionGetPublicPort( const tr_handle * h )
{
assert( h != NULL );
return tr_sharedGetPublicPort( h->shared );
}
const tr_handle_status *
tr_handleStatus( tr_handle * h )
{
tr_handle_status * s;
h->statCur = ( h->statCur + 1 ) % 2;
s = &h->stats[h->statCur];
tr_globalLock( h );
s->natTraversalStatus = tr_sharedTraversalStatus( h->shared );
s->publicPort = tr_sharedGetPublicPort( h->shared );
tr_globalUnlock( h );
return s;
}
/***
****
***/
void
tr_sessionSetSpeedLimitEnabled( tr_handle * h,
int up_or_down,
int use_flag )
{
if( up_or_down == TR_UP )
h->useUploadLimit = use_flag ? 1 : 0;
else
h->useDownloadLimit = use_flag ? 1 : 0;
}
int
tr_sessionIsSpeedLimitEnabled( const tr_handle * h, int up_or_down )
{
return up_or_down==TR_UP ? h->useUploadLimit : h->useDownloadLimit;
}
void
tr_sessionSetSpeedLimit( tr_handle * h,
int up_or_down,
int KiB_sec )
{
if( up_or_down == TR_DOWN )
tr_rcSetLimit( h->download, KiB_sec );
else
tr_rcSetLimit( h->upload, KiB_sec );
}
int
tr_sessionGetSpeedLimit( const tr_handle * h, int up_or_down )
{
return tr_rcGetLimit( up_or_down==TR_UP ? h->upload : h->download );
}
/***
****
***/
void
tr_sessionSetPeerLimit( tr_handle * handle UNUSED,
uint16_t maxGlobalPeers )
{
tr_fdSetPeerLimit( maxGlobalPeers );
}
uint16_t
tr_sessionGetPeerLimit( const tr_handle * handle UNUSED )
{
return tr_fdGetPeerLimit( );
}
/***
****
***/
void
tr_torrentRates( tr_handle * h, float * toClient, float * toPeer )
{
if( h )
{
tr_globalLock( h );
if( toClient )
*toClient = tr_rcRate( h->download );
if( toPeer )
*toPeer = tr_rcRate( h->upload );
tr_globalUnlock( h );
}
}
int
tr_torrentCount( const tr_handle * h )
{
return h->torrentCount;
}
static void
tr_closeAllConnections( void * vh )
{
tr_handle * h = vh;
tr_torrent * tor;
tr_sharedShuttingDown( h->shared );
tr_trackerShuttingDown( h );
while(( tor = tr_torrentNext( h, NULL )))
tr_torrentClose( tor );
tr_peerMgrFree( h->peerMgr );
tr_rcClose( h->upload );
tr_rcClose( h->download );
h->isClosed = TRUE;
}
static int
deadlineReached( const uint64_t deadline )
{
return tr_date( ) >= deadline;
}
#define SHUTDOWN_MAX_SECONDS 30
void
tr_close( tr_handle * h )
{
int i;
const int maxwait_msec = SHUTDOWN_MAX_SECONDS * 1000;
const uint64_t deadline = tr_date( ) + maxwait_msec;
tr_deepLog( __FILE__, __LINE__, NULL, "shutting down transmission session %p", h );
tr_statsClose( h );
tr_runInEventThread( h, tr_closeAllConnections, h );
while( !h->isClosed && !deadlineReached( deadline ) )
tr_wait( 100 );
_tr_blocklistFree( h->blocklist );
h->blocklist = NULL;
tr_webClose( &h->web );
tr_eventClose( h );
while( h->events && !deadlineReached( deadline ) )
tr_wait( 100 );
tr_fdClose( );
tr_lockFree( h->lock );
for( i=0; i<h->metainfoLookupCount; ++i )
tr_free( h->metainfoLookup[i].filename );
tr_free( h->metainfoLookup );
tr_free( h->tag );
tr_free( h->configDir );
tr_free( h->resumeDir );
tr_free( h->torrentDir );
free( h );
}
tr_torrent **
tr_loadTorrents ( tr_handle * h,
tr_ctor * ctor,
int * setmeCount )
{
int i, n = 0;
struct stat sb;
DIR * odir = NULL;
const char * dirname = tr_getTorrentDir( h );
tr_torrent ** torrents;
tr_list *l=NULL, *list=NULL;
tr_ctorSetSave( ctor, FALSE ); /* since we already have them */
if( !stat( dirname, &sb )
&& S_ISDIR( sb.st_mode )
&& (( odir = opendir ( dirname ) )) )
{
struct dirent *d;
for (d = readdir( odir ); d!=NULL; d=readdir( odir ) )
{
if( d->d_name && d->d_name[0]!='.' ) /* skip dotfiles, ., and .. */
{
tr_torrent * tor;
char filename[MAX_PATH_LENGTH];
tr_buildPath( filename, sizeof(filename), dirname, d->d_name, NULL );
tr_ctorSetMetainfoFromFile( ctor, filename );
tor = tr_torrentNew( h, ctor, NULL );
if( tor ) {
tr_list_append( &list, tor );
n++;
}
}
}
closedir( odir );
}
torrents = tr_new( tr_torrent*, n );
for( i=0, l=list; l!=NULL; l=l->next )
torrents[i++] = (tr_torrent*) l->data;
assert( i==n );
tr_list_free( &list, NULL );
if( n )
tr_inf( _( "Loaded %d torrents" ), n );
*setmeCount = n;
return torrents;
}
/***
****
***/
void
tr_sessionSetPexEnabled( tr_handle * handle, int isPexEnabled )
{
handle->isPexEnabled = isPexEnabled ? 1 : 0;
}
int
tr_sessionIsPexEnabled( const tr_handle * handle )
{
return handle->isPexEnabled;
}
/***
****
***/
void
tr_sessionSetPortForwardingEnabled( tr_handle * h, int enable )
{
tr_globalLock( h );
tr_sharedTraversalEnable( h->shared, enable );
tr_globalUnlock( h );
}
int
tr_sessionIsPortForwardingEnabled( const tr_handle * h )
{
return tr_sharedTraversalIsEnabled( h->shared );
}
/***
****
***/
int
tr_blocklistGetRuleCount( tr_handle * handle )
{
return _tr_blocklistGetRuleCount( handle->blocklist );
}
int
tr_blocklistIsEnabled( const tr_handle * handle )
{
return _tr_blocklistIsEnabled( handle->blocklist );
}
void
tr_blocklistSetEnabled( tr_handle * handle, int isEnabled )
{
_tr_blocklistSetEnabled( handle->blocklist, isEnabled );
}
int
tr_blocklistExists( const tr_handle * handle )
{
return _tr_blocklistExists( handle->blocklist );
}
int
tr_blocklistSetContent( tr_handle * handle, const char * filename )
{
return _tr_blocklistSetContent( handle->blocklist, filename );
}
int
tr_blocklistHasAddress( tr_handle * handle, const struct in_addr * addr )
{
return _tr_blocklistHasAddress( handle->blocklist, addr );
}
/***
****
***/
static int
compareLookupEntries( const void * va, const void * vb )
{
const struct tr_metainfo_lookup * a = va;
const struct tr_metainfo_lookup * b = vb;
return strcmp( a->hashString, b->hashString );
}
static void
metainfoLookupResort( tr_handle * h )
{
qsort( h->metainfoLookup,
h->metainfoLookupCount,
sizeof( struct tr_metainfo_lookup ),
compareLookupEntries );
}
static int
compareHashStringToLookupEntry( const void * va, const void * vb )
{
const char * a = va;
const struct tr_metainfo_lookup * b = vb;
return strcmp( a, b->hashString );
}
const char*
tr_sessionFindTorrentFile( const tr_handle * h,
const char * hashStr )
{
struct tr_metainfo_lookup * l = bsearch( hashStr,
h->metainfoLookup,
h->metainfoLookupCount,
sizeof( struct tr_metainfo_lookup ),
compareHashStringToLookupEntry );
return l ? l->filename : NULL;
}
static void
metainfoLookupRescan( tr_handle * h )
{
int i;
int n;
struct stat sb;
const char * dirname = tr_getTorrentDir( h );
DIR * odir = NULL;
tr_ctor * ctor = NULL;
tr_list * list = NULL;
/* walk through the directory and find the mappings */
ctor = tr_ctorNew( h );
tr_ctorSetSave( ctor, FALSE ); /* since we already have them */
if( !stat( dirname, &sb ) && S_ISDIR( sb.st_mode ) && (( odir = opendir( dirname ))))
{
struct dirent *d;
for (d = readdir( odir ); d!=NULL; d=readdir( odir ) )
{
if( d->d_name && d->d_name[0]!='.' ) /* skip dotfiles, ., and .. */
{
tr_info inf;
char filename[MAX_PATH_LENGTH];
tr_buildPath( filename, sizeof(filename), dirname, d->d_name, NULL );
tr_ctorSetMetainfoFromFile( ctor, filename );
if( !tr_torrentParse( h, ctor, &inf ) )
{
tr_list_append( &list, tr_strdup( inf.hashString ) );
tr_list_append( &list, tr_strdup( filename ) );
tr_metainfoFree( &inf );
}
}
}
closedir( odir );
}
tr_ctorFree( ctor );
n = tr_list_size( list ) / 2;
h->metainfoLookup = tr_new0( struct tr_metainfo_lookup, n );
h->metainfoLookupCount = n;
for( i=0; i<n; ++i )
{
char * hashString = tr_list_pop_front( &list );
char * filename = tr_list_pop_front( &list );
memcpy( h->metainfoLookup[i].hashString, hashString, 2*SHA_DIGEST_LENGTH+1 );
tr_free( hashString );
h->metainfoLookup[i].filename = filename;
}
metainfoLookupResort( h );
tr_dbg( "Found %d torrents in \"%s\"", n, dirname );
}
void
tr_sessionSetTorrentFile( tr_handle * h,
const char * hashString,
const char * filename )
{
struct tr_metainfo_lookup * l = bsearch( hashString,
h->metainfoLookup,
h->metainfoLookupCount,
sizeof( struct tr_metainfo_lookup ),
compareHashStringToLookupEntry );
if( l != NULL )
{
if( l->filename != filename )
{
tr_free( l->filename );
l->filename = tr_strdup( filename );
}
}
else
{
const int n = h->metainfoLookupCount++;
struct tr_metainfo_lookup * node;
h->metainfoLookup = tr_renew( struct tr_metainfo_lookup,
h->metainfoLookup,
h->metainfoLookupCount );
node = h->metainfoLookup + n;
memcpy( node->hashString, hashString, 2*SHA_DIGEST_LENGTH+1 );
node->filename = tr_strdup( filename );
metainfoLookupResort( h );
}
}
tr_torrent*
tr_torrentNext( tr_handle * session, tr_torrent * tor )
{
return tor ? tor->next : session->torrentList;
}
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