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transmission/daemon/daemon.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 <assert.h>
#include <errno.h>
#include <stdio.h> /* printf */
#include <stdlib.h> /* exit, atoi */
#include <string.h> /* strcmp */
#include <sys/types.h> /* umask*/
#include <sys/stat.h> /* umask*/
#include <fcntl.h> /* open */
#include <signal.h>
#include <unistd.h> /* daemon */
#include <event.h>
#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/utils.h>
#include <libtransmission/version.h>
#include "watch.h"
#define MY_NAME "transmission-daemon"
#define PREF_KEY_DIR_WATCH "watch-dir"
#define PREF_KEY_DIR_WATCH_ENABLED "watch-dir-enabled"
static tr_bool closing = FALSE;
static tr_session * mySession = NULL;
/***
**** Config File
***/
static const char *
getUsage( void )
{
return "Transmission " LONG_VERSION_STRING
" http://www.transmissionbt.com/\n"
"A fast and easy BitTorrent client\n"
"\n"
MY_NAME " is a headless Transmission session\n"
"that can be controlled via transmission-remote or Clutch.\n"
"\n"
"Usage: " MY_NAME " [options]";
}
static const struct tr_option options[] =
{
{ 'a', "allowed", "Allowed IP addresses. (Default: " TR_DEFAULT_RPC_WHITELIST ")", "a", 1, "<list>" },
{ 'b', "blocklist", "Enable peer blocklists", "b", 0, NULL },
{ 'B', "no-blocklist", "Disable peer blocklists", "B", 0, NULL },
{ 'c', "watch-dir", "Directory to watch for new .torrent files", "c", 1, "<directory>" },
{ 'C', "no-watch-dir", "Disable the watch-dir", "C", 0, NULL },
{ 'd', "dump-settings", "Dump the settings and exit", "d", 0, NULL },
{ 'f', "foreground", "Run in the foreground instead of daemonizing", "f", 0, NULL },
{ 'g', "config-dir", "Where to look for configuration files", "g", 1, "<path>" },
{ 'p', "port", "RPC port (Default: " TR_DEFAULT_RPC_PORT_STR ")", "p", 1, "<port>" },
{ 't', "auth", "Require authentication", "t", 0, NULL },
{ 'T', "no-auth", "Don't require authentication", "T", 0, NULL },
{ 'u', "username", "Set username for authentication", "u", 1, "<username>" },
{ 'v', "password", "Set password for authentication", "v", 1, "<password>" },
{ 'V', "version", "Show version number and exit", "V", 0, NULL },
{ 'w', "download-dir", "Where to save downloaded data", "w", 1, "<path>" },
{ 'P', "peerport", "Port for incoming peers (Default: " TR_DEFAULT_PEER_PORT_STR ")", "P", 1, "<port>" },
{ 'm', "portmap", "Enable portmapping via NAT-PMP or UPnP", "m", 0, NULL },
{ 'M', "no-portmap", "Disable portmapping", "M", 0, NULL },
{ 'L', "peerlimit-global", "Maximum overall number of peers (Default: " TR_DEFAULT_PEER_LIMIT_GLOBAL_STR ")", "L", 1, "<limit>" },
{ 'l', "peerlimit-torrent", "Maximum number of peers per torrent (Default: " TR_DEFAULT_PEER_LIMIT_TORRENT_STR ")", "l", 1, "<limit>" },
{ 910, "encryption-required", "Encrypt all peer connections", "er", 0, NULL },
{ 911, "encryption-preferred", "Prefer encrypted peer connections", "ep", 0, NULL },
{ 912, "encryption-tolerated", "Prefer unencrypted peer connections", "et", 0, NULL },
{ 0, NULL, NULL, NULL, 0, NULL }
};
static void
showUsage( void )
{
tr_getopt_usage( MY_NAME, getUsage( ), options );
exit( 0 );
}
static void
gotsig( int sig UNUSED )
{
closing = TRUE;
}
#if defined(WIN32)
#define USE_NO_DAEMON
#elif !defined(HAVE_DAEMON) || defined(__UCLIBC__)
#define USE_TR_DAEMON
#else
#define USE_OS_DAEMON
#endif
static int
tr_daemon( int nochdir, int noclose )
{
#if defined(USE_OS_DAEMON)
return daemon( nochdir, noclose );
#elif defined(USE_TR_DAEMON)
pid_t pid = fork( );
if( pid < 0 )
return -1;
else if( pid > 0 )
_exit( 0 );
else {
pid = setsid( );
if( pid < 0 )
return -1;
pid = fork( );
if( pid < 0 )
return -1;
else if( pid > 0 )
_exit( 0 );
else {
if( !nochdir )
if( chdir( "/" ) < 0 )
return -1;
umask( (mode_t)0 );
if( !noclose ) {
/* send stdin, stdout, and stderr to /dev/null */
int i;
int fd = open( "/dev/null", O_RDWR, 0 );
for( i=0; i<3; ++i ) {
if( close( i ) )
return -1;
dup2( fd, i );
}
close( fd );
}
return 0;
}
}
#else /* USE_NO_DAEMON */
return 0;
#endif
}
static const char*
getConfigDir( int argc, const char ** argv )
{
int c;
const char * configDir = NULL;
const char * optarg;
const int ind = tr_optind;
while(( c = tr_getopt( getUsage( ), argc, argv, options, &optarg ))) {
if( c == 'g' ) {
configDir = optarg;
break;
}
}
tr_optind = ind;
if( configDir == NULL )
configDir = tr_getDefaultConfigDir( MY_NAME );
return configDir;
}
static void
onFileAdded( tr_session * session, const char * dir, const char * file )
{
if( strstr( file, ".torrent" ) != NULL )
{
char * filename = tr_buildPath( dir, file, NULL );
tr_ctor * ctor = tr_ctorNew( session );
int err = tr_ctorSetMetainfoFromFile( ctor, filename );
if( !err )
tr_torrentNew( ctor, &err );
tr_ctorFree( ctor );
tr_free( filename );
}
}
int
main( int argc, char ** argv )
{
int c;
const char * optarg;
tr_benc settings;
tr_bool boolVal;
tr_bool foreground = FALSE;
tr_bool dumpSettings = FALSE;
const char * configDir = NULL;
dtr_watchdir * watchdir = NULL;
signal( SIGINT, gotsig );
signal( SIGTERM, gotsig );
#ifndef WIN32
signal( SIGQUIT, gotsig );
signal( SIGPIPE, SIG_IGN );
signal( SIGHUP, SIG_IGN );
#endif
/* load settings from defaults + config file */
tr_bencInitDict( &settings, 0 );
configDir = getConfigDir( argc, (const char**)argv );
tr_sessionLoadSettings( &settings, configDir, MY_NAME );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_ENABLED, TRUE );
/* overwrite settings from the comamndline */
tr_optind = 1;
while(( c = tr_getopt( getUsage(), argc, (const char**)argv, options, &optarg ))) {
switch( c ) {
case 'a': tr_bencDictAddStr( &settings, TR_PREFS_KEY_RPC_WHITELIST, optarg );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_WHITELIST_ENABLED, TRUE );
break;
case 'b': tr_bencDictAddBool( &settings, TR_PREFS_KEY_BLOCKLIST_ENABLED, TRUE );
break;
case 'B': tr_bencDictAddBool( &settings, TR_PREFS_KEY_BLOCKLIST_ENABLED, FALSE );
break;
case 'c': tr_bencDictAddStr( &settings, PREF_KEY_DIR_WATCH, optarg );
tr_bencDictAddBool( &settings, PREF_KEY_DIR_WATCH_ENABLED, TRUE );
break;
case 'C': tr_bencDictAddBool( &settings, PREF_KEY_DIR_WATCH_ENABLED, FALSE );
break;
case 'd': dumpSettings = TRUE;
break;
case 'f': foreground = TRUE;
break;
case 'g': /* handled above */
break;
case 'V': /* version */
fprintf(stderr, "Transmission %s\n", LONG_VERSION_STRING);
exit( 0 );
case 'p': tr_bencDictAddInt( &settings, TR_PREFS_KEY_RPC_PORT, atoi( optarg ) );
break;
case 't': tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_AUTH_REQUIRED, TRUE );
break;
case 'T': tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_AUTH_REQUIRED, FALSE );
break;
case 'u': tr_bencDictAddStr( &settings, TR_PREFS_KEY_RPC_USERNAME, optarg );
break;
case 'v': tr_bencDictAddStr( &settings, TR_PREFS_KEY_RPC_PASSWORD, optarg );
break;
case 'w': tr_bencDictAddStr( &settings, TR_PREFS_KEY_DOWNLOAD_DIR, optarg );
break;
case 'P': tr_bencDictAddInt( &settings, TR_PREFS_KEY_PEER_PORT, atoi( optarg ) );
break;
case 'm': tr_bencDictAddBool( &settings, TR_PREFS_KEY_PORT_FORWARDING, TRUE );
break;
case 'M': tr_bencDictAddBool( &settings, TR_PREFS_KEY_PORT_FORWARDING, FALSE );
break;
case 'L': tr_bencDictAddInt( &settings, TR_PREFS_KEY_PEER_LIMIT_GLOBAL, atoi( optarg ) );
break;
case 'l': tr_bencDictAddInt( &settings, TR_PREFS_KEY_PEER_LIMIT_TORRENT, atoi( optarg ) );
break;
case 910: tr_bencDictAddInt( &settings, TR_PREFS_KEY_ENCRYPTION, TR_ENCRYPTION_REQUIRED );
break;
case 911: tr_bencDictAddInt( &settings, TR_PREFS_KEY_ENCRYPTION, TR_ENCRYPTION_PREFERRED );
break;
case 912: tr_bencDictAddInt( &settings, TR_PREFS_KEY_ENCRYPTION, TR_CLEAR_PREFERRED );
break;
default: showUsage( );
break;
}
}
if( dumpSettings )
{
struct evbuffer * buf = tr_getBuffer( );
tr_bencSaveAsJSON( &settings, buf );
fprintf( stderr, "%s", (char*)EVBUFFER_DATA(buf) );
tr_releaseBuffer( buf );
return 0;
}
if( !foreground && tr_daemon( TRUE, FALSE ) < 0 )
{
fprintf( stderr, "failed to daemonize: %s\n", strerror( errno ) );
exit( 1 );
}
/* start the session */
mySession = tr_sessionInit( "daemon", configDir, FALSE, &settings );
if( tr_bencDictFindBool( &settings, TR_PREFS_KEY_RPC_AUTH_REQUIRED, &boolVal ) && boolVal )
tr_ninf( MY_NAME, "requiring authentication" );
/* maybe add a watchdir */
{
const char * dir;
if( tr_bencDictFindBool( &settings, PREF_KEY_DIR_WATCH_ENABLED, &boolVal )
&& boolVal
&& tr_bencDictFindStr( &settings, PREF_KEY_DIR_WATCH, &dir )
&& dir
&& *dir )
{
tr_inf( "Watching \"%s\" for new .torrent files", dir );
watchdir = dtr_watchdir_new( mySession, dir, onFileAdded );
}
}
/* load the torrents */
{
tr_ctor * ctor = tr_ctorNew( mySession );
tr_torrent ** torrents = tr_sessionLoadTorrents( mySession, ctor, NULL );
tr_free( torrents );
tr_ctorFree( ctor );
}
while( !closing )
{
tr_wait( 1000 ); /* sleep one second */
dtr_watchdir_update( watchdir );
}
/* shutdown */
printf( "Closing transmission session..." );
tr_sessionSaveSettings( mySession, configDir, &settings );
dtr_watchdir_free( watchdir );
tr_sessionClose( mySession );
printf( " done.\n" );
/* cleanup */
tr_bencFree( &settings );
return 0;
}
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