transmission/libtransmission/transmission.c

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/******************************************************************************
* $Id$
*
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* Copyright (c) 2005-2007 Transmission authors and contributors
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*
* 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.
*****************************************************************************/
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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <signal.h>
#include <sys/types.h> /* stat */
#include <sys/stat.h> /* stat */
#include <unistd.h> /* stat */
#include <dirent.h> /* opendir */
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#include "transmission.h"
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#include "fdlimit.h"
#include "list.h"
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#include "net.h"
#include "peer-mgr.h"
#include "platform.h"
#include "ratecontrol.h"
#include "shared.h"
#include "stats.h"
#include "tracker.h"
#include "trevent.h"
#include "utils.h"
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/* 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) */
void
tr_peerIdNew ( char * buf, int buflen )
{
int i;
assert( buflen == TR_ID_LEN + 1 );
snprintf( buf, TR_ID_LEN, "%s", PEERID_PREFIX );
assert( strlen(buf) == 8 );
for( i=8; i<TR_ID_LEN; ++i ) {
const int r = tr_rand( 36 );
buf[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
}
buf[TR_ID_LEN] = '\0';
}
const char*
getPeerId( void )
{
static char * peerId = NULL;
if( !peerId ) {
peerId = tr_new0( char, TR_ID_LEN + 1 );
tr_peerIdNew( peerId, TR_ID_LEN + 1 );
}
return peerId;
}
/***
****
***/
tr_encryption_mode
tr_getEncryptionMode( tr_handle * handle )
{
assert( handle != NULL );
return handle->encryptionMode;
}
void
tr_setEncryptionMode( tr_handle * handle, tr_encryption_mode mode )
{
assert( handle != NULL );
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assert( mode==TR_ENCRYPTION_PREFERRED
|| mode==TR_ENCRYPTION_REQUIRED
|| mode==TR_PLAINTEXT_PREFERRED );
handle->encryptionMode = mode;
}
/***
****
***/
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/***********************************************************************
* tr_init
***********************************************************************
* Allocates a tr_handle structure and initializes a few things
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**********************************************************************/
tr_handle * tr_init( const char * tag )
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{
tr_handle * h;
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#ifndef WIN32
/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
#endif
tr_msgInit();
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h = tr_new0( tr_handle, 1 );
if( !h )
return NULL;
h->lock = tr_lockNew( );
h->encryptionMode = TR_ENCRYPTION_PREFERRED;
tr_netInit(); /* must go before tr_eventInit */
tr_eventInit( h );
while( !h->events )
tr_wait( 50 );
h->tag = strdup( tag );
if( !h->tag ) {
free( h );
return NULL;
}
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h->peerMgr = tr_peerMgrNew( h );
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/* Initialize rate and file descripts controls */
h->upload = tr_rcInit();
h->download = tr_rcInit();
tr_fdInit();
h->shared = tr_sharedInit( h );
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tr_inf( TR_NAME " " LONG_VERSION_STRING " started" );
tr_statsInit( h );
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return h;
}
/***
****
***/
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 tr_lockHave( handle->lock );
}
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/***********************************************************************
* tr_setBindPort
***********************************************************************
*
**********************************************************************/
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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_setBindPort( tr_handle * handle, int port )
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{
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struct bind_port_data * data = tr_new( struct bind_port_data, 1 );
data->handle = handle;
data->port = port;
tr_runInEventThread( handle, tr_setBindPortImpl, data );
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}
int
tr_getPublicPort( const tr_handle * h )
{
assert( h != NULL );
return tr_sharedGetPublicPort( h->shared );
}
void tr_natTraversalEnable( tr_handle * h, int enable )
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{
tr_globalLock( h );
tr_sharedTraversalEnable( h->shared, enable );
tr_globalUnlock( h );
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}
tr_handle_status * tr_handleStatus( tr_handle * h )
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{
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;
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}
/***
****
***/
void
tr_setUseGlobalSpeedLimit( tr_handle * h,
int up_or_down,
int use_flag )
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{
char * ch = up_or_down==TR_UP ? &h->useUploadLimit
: &h->useDownloadLimit;
*ch = use_flag;
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}
void
tr_setGlobalSpeedLimit( tr_handle * h,
int up_or_down,
int KiB_sec )
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{
if( up_or_down == TR_DOWN )
tr_rcSetLimit( h->download, KiB_sec );
else
tr_rcSetLimit( h->upload, KiB_sec );
}
void
tr_getGlobalSpeedLimit( tr_handle * h,
int up_or_down,
int * setme_enabled,
int * setme_KiBsec )
{
if( setme_enabled != NULL )
*setme_enabled = up_or_down==TR_UP ? h->useUploadLimit
: h->useDownloadLimit;
if( setme_KiBsec != NULL )
*setme_KiBsec = tr_rcGetLimit( up_or_down==TR_UP ? h->upload
: h->download );
}
void
tr_torrentRates( tr_handle * h, float * toClient, float * toPeer )
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{
const tr_torrent * tor;
tr_globalLock( h );
*toClient = *toPeer = 0.0;
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for( tor = h->torrentList; tor; tor = tor->next )
{
float c, p;
tr_torrentGetRates( tor, &c, &p );
*toClient += c;
*toPeer += p;
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}
tr_globalUnlock( h );
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}
int
tr_torrentCount( tr_handle * h )
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{
return h->torrentCount;
}
void
tr_torrentIterate( tr_handle * h, tr_callback_t func, void * d )
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{
tr_torrent * tor, * next;
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for( tor = h->torrentList; tor; tor = next )
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{
next = tor->next;
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func( tor, d );
}
}
static void
tr_closeImpl( void * vh )
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{
tr_handle * h = vh;
tr_torrent * t;
tr_trackerShuttingDown( h );
for( t=h->torrentList; t!=NULL; t=t->next )
tr_torrentClose( t );
tr_peerMgrFree( h->peerMgr );
tr_rcClose( h->upload );
tr_rcClose( h->download );
tr_natTraversalEnable( h, 0 );
while( tr_handleStatus( h )->natTraversalStatus != TR_NAT_TRAVERSAL_DISABLED )
tr_wait( 100 );
tr_sharedClose( h->shared );
tr_fdClose();
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 )
{
const int maxwait_msec = SHUTDOWN_MAX_SECONDS * 1000;
const uint64_t deadline = tr_date( ) + maxwait_msec;
tr_runInEventThread( h, tr_closeImpl, h );
while( !h->isClosed && !deadlineReached( deadline ) )
tr_wait( 100 );
tr_eventClose( h );
while( h->events && !deadlineReached( deadline ) )
tr_wait( 100 );
tr_statsClose( h );
tr_lockFree( h->lock );
free( h->tag );
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free( h );
}
tr_torrent **
tr_loadTorrents ( tr_handle * h,
const char * fallbackDestination,
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int isPaused,
int * setmeCount )
{
int i, n = 0;
struct stat sb;
DIR * odir = NULL;
const char * torrentDir = tr_getTorrentsDirectory( );
tr_torrent ** torrents;
tr_list *l=NULL, *list=NULL;
if( !stat( torrentDir, &sb )
&& S_ISDIR( sb.st_mode )
&& (( odir = opendir ( torrentDir ) )) )
{
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 path[MAX_PATH_LENGTH];
tr_buildPath( path, sizeof(path), torrentDir, d->d_name, NULL );
tor = tr_torrentLoad( h, path, fallbackDestination, isPaused, NULL );
if( tor != NULL ) {
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 );
*setmeCount = n;
tr_inf( "Loaded %d torrents from disk", *setmeCount );
return torrents;
}