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transmission/daemon/torrents.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2007 Joshua Elsasser
*
* 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 <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <time.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libtransmission/bsdtree.h>
#include <libtransmission/bencode.h>
#include <libtransmission/transmission.h>
#include <libtransmission/trcompat.h>
#include "errors.h"
#include "misc.h"
#include "torrents.h"
#define EXIT_TIMEOUT 10 /* how many seconds to wait on exit */
#define TIMER_SECS 1 /* timer interval seconds */
#define TIMER_USECS 0 /* timer interval microseconds */
struct tor
{
int id;
uint8_t hash[SHA_DIGEST_LENGTH];
tr_torrent * tor;
int pexset;
int pex;
RB_ENTRY( tor ) idlinks;
RB_ENTRY( tor ) hashlinks;
};
RB_HEAD( tortree, tor );
RB_HEAD( hashtree, tor );
static struct tor * opentor ( const char *, const char *, uint8_t *, size_t,
const char * );
static void closetor ( struct tor *, int );
static void starttimer ( int );
static void timerfunc ( int, short, void * );
static int loadstate ( void );
static int savestate ( void );
static int toridcmp ( struct tor *, struct tor * );
static int torhashcmp ( struct tor *, struct tor * );
static struct tor * idlookup ( int );
static struct tor * hashlookup ( const uint8_t * );
static struct tor * iterate ( struct tor * );
static struct event_base * gl_base = NULL;
static tr_handle * gl_handle = NULL;
static struct tortree gl_tree = RB_INITIALIZER( &gl_tree );
static struct hashtree gl_hashes = RB_INITIALIZER( &gl_hashes );
static int gl_lastid = 0;
static struct event gl_event;
static time_t gl_exiting = 0;
static int gl_exitval = 0;
static char gl_state[MAXPATHLEN];
static char gl_newstate[MAXPATHLEN];
static int gl_autostart = 1;
static int gl_pex = 1;
static int gl_port = TR_DEFAULT_PORT;
static int gl_mapping = 0;
static int gl_uplimit = -1;
static int gl_downlimit = -1;
static char gl_dir[MAXPATHLEN];
static tr_encryption_mode gl_crypto = TR_ENCRYPTION_PREFERRED;
RB_GENERATE_STATIC( tortree, tor, idlinks, toridcmp )
RB_GENERATE_STATIC( hashtree, tor, hashlinks, torhashcmp )
INTCMP_FUNC( toridcmp, tor, id )
void
torrent_init( struct event_base * base )
{
assert( NULL == gl_handle && NULL == gl_base );
gl_base = base;
gl_handle = tr_init( "daemon" );
confpath( gl_state, sizeof gl_state, CONF_FILE_STATE, 0 );
strlcpy( gl_newstate, gl_state, sizeof gl_state );
strlcat( gl_newstate, ".new", sizeof gl_state );
absolutify( gl_dir, sizeof gl_dir, "." );
loadstate();
}
int
torrent_add_file( const char * path, const char * dir, int autostart )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = opentor( path, NULL, NULL, 0, dir );
if( NULL == tor )
{
return -1;
}
if( 0 > autostart )
{
autostart = gl_autostart;
}
if( autostart )
{
tr_torrentStart( tor->tor );
}
savestate();
return tor->id;
}
int
torrent_add_data( uint8_t * data, size_t size, const char * dir, int autostart )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = opentor( NULL, NULL, data, size, dir );
if( NULL == tor )
{
return -1;
}
if( 0 > autostart )
{
autostart = gl_autostart;
}
if( autostart )
{
tr_torrentStart( tor->tor );
}
savestate();
return tor->id;
}
void
torrent_start( int id )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = idlookup( id );
if( tor != NULL )
{
const tr_stat * st = tr_torrentStat( tor->tor );
if( !TR_STATUS_IS_ACTIVE( st->status ) )
{
tr_torrentStart( tor->tor );
savestate();
}
}
}
void
torrent_stop( int id )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = idlookup( id );
if( tor != NULL )
{
const tr_stat * st = tr_torrentStat( tor->tor );
if( TR_STATUS_IS_ACTIVE( st->status ) )
{
tr_torrentStop( tor->tor );
savestate();
}
}
}
void
torrent_remove( int id )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = idlookup( id );
if( tor != NULL )
{
closetor( tor, 1 );
savestate();
}
}
const tr_info *
torrent_info( int id )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = idlookup( id );
if( NULL == tor )
{
return NULL;
}
return tr_torrentInfo( tor->tor );
}
const tr_stat *
torrent_stat( int id )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = idlookup( id );
if( NULL == tor )
{
return NULL;
}
return tr_torrentStat( tor->tor );
}
int
torrent_lookup( const uint8_t * hashstr )
{
uint8_t hash[SHA_DIGEST_LENGTH];
size_t ii;
struct tor * tor;
char buf[3];
assert( NULL != gl_handle );
assert( !gl_exiting );
memset( buf, 0, sizeof buf );
for( ii = 0; sizeof( hash ) > ii; ii++ )
{
if( !isxdigit( hashstr[2*ii] ) || !isxdigit( hashstr[1+2*ii] ) )
{
return -1;
}
memcpy( buf, &hashstr[2*ii], 2 );
hash[ii] = strtol( buf, NULL, 16 );
}
tor = hashlookup( hash );
if( NULL == tor )
{
return -1;
}
return tor->id;
}
void *
torrent_iter( void * iter, int * id )
{
struct tor * tor = iter;
assert( NULL != gl_handle );
assert( !gl_exiting );
tor = iterate( tor );
if( NULL != tor )
{
*id = tor->id;
}
return tor;
}
void
torrent_exit( int exitval )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
gl_exiting = time( NULL );
gl_exitval = exitval;
RB_FOREACH( tor, tortree, &gl_tree )
{
closetor( tor, 0 );
}
tr_natTraversalEnable( gl_handle, 0 );
starttimer( 1 );
}
void
torrent_set_autostart( int autostart )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
gl_autostart = autostart;
savestate();
}
int
torrent_get_autostart( void )
{
return gl_autostart;
}
void
torrent_set_port( int port )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
if( 0 < port && 0xffff > port )
{
gl_port = port;
tr_setBindPort( gl_handle, port );
savestate();
}
}
int
torrent_get_port( void )
{
return gl_port;
}
void
torrent_set_pex( int pex )
{
struct tor * tor;
assert( NULL != gl_handle );
assert( !gl_exiting );
if( pex == gl_pex )
{
return;
}
gl_pex = pex;
for( tor = iterate( NULL ); NULL != tor; tor = iterate( tor ) )
{
if( tor->pexset )
{
continue;
}
tr_torrentDisablePex( tor->tor, !gl_pex );
}
savestate();
}
int
torrent_get_pex( void )
{
return gl_pex;
}
void
torrent_enable_port_mapping( int automap )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
gl_mapping = ( automap ? 1 : 0 );
tr_natTraversalEnable( gl_handle, gl_mapping );
savestate();
}
int
torrent_get_port_mapping( void )
{
return gl_mapping;
}
void
torrent_set_uplimit( int uplimit )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
gl_uplimit = uplimit;
tr_setGlobalSpeedLimit ( gl_handle, TR_UP, uplimit );
tr_setUseGlobalSpeedLimit( gl_handle, TR_UP, uplimit > 0 );
savestate();
}
int
torrent_get_uplimit( void )
{
return gl_uplimit;
}
void
torrent_set_downlimit( int downlimit )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
gl_downlimit = downlimit;
tr_setGlobalSpeedLimit ( gl_handle, TR_DOWN, downlimit );
tr_setUseGlobalSpeedLimit( gl_handle, TR_DOWN, downlimit > 0 );
savestate();
}
int
torrent_get_downlimit( void )
{
return gl_downlimit;
}
void
torrent_set_directory( const char * path )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
absolutify( gl_dir, sizeof gl_dir, path );
savestate();
}
const char *
torrent_get_directory( void )
{
return gl_dir;
}
void
torrent_set_encryption(tr_encryption_mode mode)
{
tr_setEncryptionMode(gl_handle, mode);
gl_crypto = mode;
savestate();
}
tr_encryption_mode
torrent_get_encryption(void)
{
return tr_getEncryptionMode(gl_handle);
}
struct tor *
opentor( const char * path, const char * hash, uint8_t * data, size_t size,
const char * dir )
{
struct tor * tor, * found;
int errcode;
const tr_info * inf;
assert( ( NULL != path && NULL == hash && NULL == data ) ||
( NULL == path && NULL != hash && NULL == data ) ||
( NULL == path && NULL == hash && NULL != data ) );
/* XXX should probably wrap around back to 1 and avoid duplicates */
if( INT_MAX == gl_lastid )
{
errmsg( "Congratulations, you're the %ith torrent! Your prize the "
"inability to load any more torrents, enjoy!", INT_MAX );
return NULL;
}
tor = calloc( 1, sizeof *tor );
if( NULL == tor )
{
mallocmsg( sizeof *tor );
return NULL;
}
if( dir == NULL )
dir = gl_dir;
if( NULL != path )
{
tor->tor = tr_torrentInit( gl_handle, path, dir, 1, &errcode );
}
else if( NULL != hash )
{
tor->tor = tr_torrentInitSaved( gl_handle, hash, dir, 1, &errcode );
}
else
{
tor->tor = tr_torrentInitData( gl_handle, data, size, dir, 1, &errcode );
}
if( NULL == tor->tor )
{
found = NULL;
switch( errcode )
{
case TR_EINVALID:
if( NULL == path )
{
errmsg( "invalid torrent file" );
}
else
{
errmsg( "invalid torrent file: %s", path );
}
break;
case TR_EUNSUPPORTED:
if( NULL == path )
{
errmsg( "unsupported torrent file" );
}
else
{
errmsg( "unsupported torrent file: %s", path );
}
break;
case TR_EDUPLICATE:
/* XXX not yet
found = hashlookup( tor->hash, 1 );
assert( NULL != found );
found->deleting = 0;
*/
errmsg( "XXX loaded duplicate torrent" );
break;
default:
if( NULL == path )
{
errmsg( "torrent file failed to load" );
}
else
{
errmsg( "torrent file failed to load: %s", path );
}
break;
}
free( tor );
return found;
}
gl_lastid++;
tor->id = gl_lastid;
assert( sizeof( inf->hash ) == sizeof( tor->hash ) );
inf = tr_torrentInfo( tor->tor );
memcpy( tor->hash, inf->hash, sizeof tor->hash );
if( inf->isPrivate )
{
tor->pexset = 1;
tor->pex = 0;
}
else
{
tr_torrentDisablePex( tor->tor, !gl_pex );
}
found = RB_INSERT( tortree, &gl_tree, tor );
assert( NULL == found );
found = RB_INSERT( hashtree, &gl_hashes, tor );
assert( NULL == found );
return tor;
}
static void
freetor( struct tor * tor )
{
tr_torrentClose( tor->tor );
RB_REMOVE( tortree, &gl_tree, tor );
RB_REMOVE( hashtree, &gl_hashes, tor );
free( tor );
}
void
closetor( struct tor * tor, int calltimer )
{
if( NULL != tor )
{
freetor( tor );
starttimer( calltimer );
}
}
void
starttimer( int callnow )
{
if( !evtimer_initialized( &gl_event ) )
{
evtimer_set( &gl_event, timerfunc, NULL );
event_base_set( gl_base, &gl_event );
}
if( callnow )
{
timerfunc( -1, EV_TIMEOUT, NULL );
}
}
static void
timerfunc( int fd UNUSED, short event UNUSED, void * arg UNUSED )
{
struct tor * tor, * next;
tr_handle_status * hs;
int stillmore;
struct timeval tv;
/* true if we've still got live torrents... */
stillmore = tr_torrentCount( gl_handle ) != 0;
if( gl_exiting )
{
if( !stillmore )
{
hs = tr_handleStatus( gl_handle );
if( TR_NAT_TRAVERSAL_UNMAPPED != hs->natTraversalStatus )
{
stillmore = 1;
}
}
if( !stillmore || EXIT_TIMEOUT <= time( NULL ) - gl_exiting )
{
if( stillmore )
{
errmsg( "timing out trackers and/or port mapping on exit" );
}
for( tor = RB_MIN( tortree, &gl_tree ); NULL != tor; tor = next )
{
next = RB_NEXT( tortree, &gl_tree, tor );
freetor( tor );
}
tr_close( gl_handle );
exit( gl_exitval );
}
}
if( stillmore )
{
memset( &tv, 0, sizeof tv );
tv.tv_sec = TIMER_SECS;
tv.tv_usec = TIMER_USECS;
evtimer_add( &gl_event, &tv );
}
}
int
loadstate( void )
{
uint8_t * buf;
size_t len;
benc_val_t top, * num, * str, * list, * dict;
int ii;
struct tor * tor;
const char * dir;
buf = readfile( gl_state, &len );
if( NULL == buf )
{
return -1;
}
if( tr_bencLoad( buf, len, &top, NULL ) )
{
free( buf );
errmsg( "failed to load bencoded data from %s", gl_state );
return -1;
}
free( buf );
num = tr_bencDictFind( &top, "autostart" );
if( NULL != num && TYPE_INT == num->type )
{
gl_autostart = ( num->val.i ? 1 : 0 );
}
num = tr_bencDictFind( &top, "port" );
if( NULL != num && TYPE_INT == num->type &&
0 < num->val.i && 0xffff > num->val.i )
{
gl_port = num->val.i;
}
tr_setBindPort( gl_handle, gl_port );
num = tr_bencDictFind( &top, "default-pex" );
if( NULL != num && TYPE_INT == num->type )
{
gl_pex = ( num->val.i ? 1 : 0 );
}
num = tr_bencDictFind( &top, "port-mapping" );
if( NULL != num && TYPE_INT == num->type )
{
gl_mapping = ( num->val.i ? 1 : 0 );
}
tr_natTraversalEnable( gl_handle, gl_mapping );
num = tr_bencDictFind( &top, "upload-limit" );
if( NULL != num && TYPE_INT == num->type )
{
gl_uplimit = num->val.i;
}
tr_setGlobalSpeedLimit( gl_handle, TR_UP, gl_uplimit );
tr_setUseGlobalSpeedLimit( gl_handle, TR_UP, gl_uplimit > 0 );
num = tr_bencDictFind( &top, "download-limit" );
if( NULL != num && TYPE_INT == num->type )
{
gl_downlimit = num->val.i;
}
tr_setGlobalSpeedLimit( gl_handle, TR_DOWN, gl_downlimit );
tr_setUseGlobalSpeedLimit( gl_handle, TR_DOWN, gl_downlimit > 0 );
str = tr_bencDictFind( &top, "default-directory" );
if( NULL != str && TYPE_STR == str->type )
{
strlcpy( gl_dir, str->val.s.s, sizeof gl_dir );
}
str = tr_bencDictFind( &top, "encryption-mode" );
if( NULL != str && TYPE_STR == str->type )
{
if(!strcasecmp(str->val.s.s, "preferred"))
gl_crypto = TR_ENCRYPTION_PREFERRED;
else if(!strcasecmp(str->val.s.s, "required"))
gl_crypto = TR_ENCRYPTION_REQUIRED;
}
tr_setEncryptionMode(gl_handle, gl_crypto);
list = tr_bencDictFind( &top, "torrents" );
if( NULL == list || TYPE_LIST != list->type )
{
return 0;
}
for( ii = 0; ii < list->val.l.count; ii++ )
{
dict = &list->val.l.vals[ii];
if( TYPE_DICT != dict->type )
{
continue;
}
str = tr_bencDictFind( dict, "directory" );
dir = ( NULL != str && TYPE_STR == str->type ? str->val.s.s : NULL );
str = tr_bencDictFind( dict, "hash" );
if( NULL == str || TYPE_STR != str->type ||
2 * SHA_DIGEST_LENGTH != str->val.s.i )
{
continue;
}
tor = opentor( NULL, str->val.s.s, NULL, 0, dir );
if( NULL == tor )
{
continue;
}
num = tr_bencDictFind( dict, "pex" );
if( NULL != num && TYPE_INT == num->type )
{
tor->pexset = 1;
tor->pex = ( num->val.i ? 1 : 0 );
}
tr_torrentDisablePex( tor->tor, !( tor->pexset ? tor->pex : gl_pex ) );
num = tr_bencDictFind( dict, "paused" );
if( NULL != num && TYPE_INT == num->type && !num->val.i )
{
tr_torrentStart( tor->tor );
}
}
return 0;
}
int
savestate( void )
{
benc_val_t top, * list, * tor;
struct tor * ii;
uint8_t * buf;
int len, pexset;
tr_bencInit( &top, TYPE_DICT );
if( tr_bencDictReserve( &top, 9 ) )
{
nomem:
tr_bencFree( &top );
errmsg( "failed to save state: failed to allocate memory" );
return -1;
}
tr_bencInitInt( tr_bencDictAdd( &top, "autostart" ), gl_autostart );
tr_bencInitInt( tr_bencDictAdd( &top, "port" ), gl_port );
tr_bencInitInt( tr_bencDictAdd( &top, "default-pex" ), gl_pex );
tr_bencInitInt( tr_bencDictAdd( &top, "port-mapping" ), gl_mapping );
tr_bencInitInt( tr_bencDictAdd( &top, "upload-limit" ), gl_uplimit );
tr_bencInitInt( tr_bencDictAdd( &top, "download-limit" ), gl_downlimit );
tr_bencInitStr( tr_bencDictAdd( &top, "default-directory" ),
gl_dir, -1, 1 );
if(TR_ENCRYPTION_REQUIRED == gl_crypto)
tr_bencInitStr(tr_bencDictAdd(&top, "encryption-mode"), "required", -1, 1);
else
tr_bencInitStr(tr_bencDictAdd(&top, "encryption-mode"), "preferred", -1, 1);
list = tr_bencDictAdd( &top, "torrents" );
tr_bencInit( list, TYPE_LIST );
len = 0;
RB_FOREACH( ii, tortree, &gl_tree )
{
len++;
}
if( tr_bencListReserve( list, len ) )
{
goto nomem;
}
RB_FOREACH( ii, tortree, &gl_tree )
{
const tr_info * inf;
const tr_stat * st;
tor = tr_bencListAdd( list );
assert( NULL != tor );
tr_bencInit( tor, TYPE_DICT );
inf = tr_torrentInfo( ii->tor );
st = tr_torrentStat( ii->tor );
pexset = ( ii->pexset && !inf->isPrivate );
if( tr_bencDictReserve( tor, ( pexset ? 4 : 3 ) ) )
{
goto nomem;
}
tr_bencInitStr( tr_bencDictAdd( tor, "hash" ),
inf->hashString, 2 * SHA_DIGEST_LENGTH, 1 );
tr_bencInitInt( tr_bencDictAdd( tor, "paused" ),
!TR_STATUS_IS_ACTIVE( st->status ) );
tr_bencInitStr( tr_bencDictAdd( tor, "directory" ),
tr_torrentGetFolder( ii->tor ), -1, 1 );
if( pexset )
{
tr_bencInitInt( tr_bencDictAdd( tor, "pex" ), ii->pex );
}
}
buf = ( uint8_t * )tr_bencSave( &top, &len );
SAFEBENCFREE( &top );
if( NULL == buf )
{
errnomsg( "failed to save state: bencoding failed" );
return -1;
}
if( 0 > writefile( gl_newstate, buf, len ) )
{
free( buf );
return -1;
}
free( buf );
if( 0 > rename( gl_newstate, gl_state ) )
{
errnomsg( "failed to save state: failed to rename %s to %s",
gl_newstate, CONF_FILE_STATE );
return -1;
}
return 0;
}
int
torhashcmp( struct tor * left, struct tor * right )
{
return memcmp( left->hash, right->hash, sizeof left->hash );
}
struct tor *
idlookup( int id )
{
struct tor key, * found;
memset( &key, 0, sizeof key );
key.id = id;
found = RB_FIND( tortree, &gl_tree, &key );
return found;
}
struct tor *
hashlookup( const uint8_t * hash )
{
struct tor key, * found;
memset( &key, 0, sizeof key );
memcpy( key.hash, hash, sizeof key.hash );
found = RB_FIND( hashtree, &gl_hashes, &key );
return found;
}
struct tor *
iterate( struct tor * tor )
{
assert( NULL != gl_handle );
assert( !gl_exiting );
if( NULL == tor )
{
tor = RB_MIN( tortree, &gl_tree );
}
else
{
tor = RB_NEXT( tortree, &gl_tree, tor );
}
return tor;
}
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