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transmission/daemon/daemon.c

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/*
* This file Copyright (C) 2008-2010 Mnemosyne LLC
*
* 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 <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>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif
#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 paused = FALSE;
static tr_bool closing = FALSE;
static tr_session * mySession = NULL;
static const char * pid_filename = 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\n"
"or the web interface.\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 },
{ 941, "incomplete-dir", "Where to store new torrents until they're complete", NULL, 1, "<directory>" },
{ 942, "no-incomplete-dir", "Don't store incomplete torrents in a different location", NULL, 0, NULL },
{ 'd', "dump-settings", "Dump the settings and exit", "d", 0, NULL },
{ 'e', "logfile", "Dump the log messages to this filename", "e", 1, "<filename>" },
{ '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>" },
{ 800, "paused", "Pause all torrents on startup", NULL, 0, NULL },
{ 'o', "dht", "Enable distributed hash tables (DHT)", "o", 0, NULL },
{ 'O', "no-dht", "Disable distributed hash tables (DHT)", "O", 0, NULL },
{ 'y', "lpd", "Enable local peer discovery (LPD)", "y", 0, NULL },
{ 'Y', "no-lpd", "Disable local peer discovery (LPD)", "Y", 0, NULL },
{ '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 },
{ 'i', "bind-address-ipv4", "Where to listen for peer connections", "i", 1, "<ipv4 address>" },
{ 'I', "bind-address-ipv6", "Where to listen for peer connections", "I", 1, "<ipv6 address>" },
{ 'r', "rpc-bind-address", "Where to listen for RPC connections", "r", 1, "<ipv4 address>" },
{ 953, "global-seedratio", "All torrents, unless overridden by a per-torrent setting, should seed until a specific ratio", "gsr", 1, "ratio" },
{ 954, "no-global-seedratio", "All torrents, unless overridden by a per-torrent setting, should seed regardless of ratio", "GSR", 0, NULL },
{ 'x', "pid-file", "Enable PID file", "x", 1, "<pid-file>" },
{ 0, NULL, NULL, NULL, 0, NULL }
};
static void
showUsage( void )
{
tr_getopt_usage( MY_NAME, getUsage( ), options );
exit( 0 );
}
static void
gotsig( int sig )
{
switch( sig )
{
case SIGHUP:
{
tr_benc settings;
const char * configDir = tr_sessionGetConfigDir( mySession );
tr_inf( "Reloading settings from \"%s\"", configDir );
tr_bencInitDict( &settings, 0 );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_ENABLED, TRUE );
tr_sessionLoadSettings( &settings, configDir, MY_NAME );
tr_sessionSet( mySession, &settings );
tr_bencFree( &settings );
tr_sessionReloadBlocklists( mySession );
break;
}
default:
closing = TRUE;
break;
}
}
#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 );
if( fd < 0 )
fprintf( stderr, "unable to open /dev/null: %s\n", tr_strerror(errno) );
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 )
{
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 );
if( err == TR_PARSE_ERR )
tr_err( "Error parsing .torrent file \"%s\"", file );
else
{
tr_bool trash = FALSE;
int test = tr_ctorGetDeleteSource( ctor, &trash );
tr_inf( "Parsing .torrent file successful \"%s\"", file );
if( !test && trash )
{
tr_inf( "Deleting input .torrent file \"%s\"", file );
if( remove( filename ) )
tr_err( "Error deleting .torrent file: %s", tr_strerror( errno ) );
}
}
}
tr_ctorFree( ctor );
tr_free( filename );
}
static void
printMessage( FILE * logfile, int level, const char * name, const char * message, const char * file, int line )
{
if( logfile != NULL )
{
char timestr[64];
tr_getLogTimeStr( timestr, sizeof( timestr ) );
if( name )
fprintf( logfile, "[%s] %s %s (%s:%d)\n", timestr, name, message, file, line );
else
fprintf( logfile, "[%s] %s (%s:%d)\n", timestr, message, file, line );
}
#ifdef HAVE_SYSLOG
else /* daemon... write to syslog */
{
int priority;
/* figure out the syslog priority */
switch( level ) {
case TR_MSG_ERR: priority = LOG_ERR; break;
case TR_MSG_DBG: priority = LOG_DEBUG; break;
default: priority = LOG_INFO; break;
}
if( name )
syslog( priority, "%s %s (%s:%d)", name, message, file, line );
else
syslog( priority, "%s (%s:%d)", message, file, line );
}
#endif
}
static void
pumpLogMessages( FILE * logfile )
{
const tr_msg_list * l;
tr_msg_list * list = tr_getQueuedMessages( );
for( l=list; l!=NULL; l=l->next )
printMessage( logfile, l->level, l->name, l->message, l->file, l->line );
tr_freeMessageList( list );
}
int
main( int argc, char ** argv )
{
int c;
const char * optarg;
tr_benc settings;
tr_bool boolVal;
tr_bool loaded;
tr_bool foreground = FALSE;
tr_bool dumpSettings = FALSE;
const char * configDir = NULL;
dtr_watchdir * watchdir = NULL;
FILE * logfile = NULL;
tr_bool pidfile_created = FALSE;
signal( SIGINT, gotsig );
signal( SIGTERM, gotsig );
#ifndef WIN32
signal( SIGHUP, gotsig );
#endif
/* load settings from defaults + config file */
tr_bencInitDict( &settings, 0 );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_RPC_ENABLED, TRUE );
configDir = getConfigDir( argc, (const char**)argv );
loaded = tr_sessionLoadSettings( &settings, configDir, MY_NAME );
/* 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 941: tr_bencDictAddStr( &settings, TR_PREFS_KEY_INCOMPLETE_DIR, optarg );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_INCOMPLETE_DIR_ENABLED, TRUE );
break;
case 942: tr_bencDictAddBool( &settings, TR_PREFS_KEY_INCOMPLETE_DIR_ENABLED, FALSE );
break;
case 'd': dumpSettings = TRUE;
break;
case 'e': logfile = fopen( optarg, "a+" );
if( logfile == NULL )
fprintf( stderr, "Couldn't open \"%s\": %s\n", optarg, tr_strerror( errno ) );
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 'o': tr_bencDictAddBool( &settings, TR_PREFS_KEY_DHT_ENABLED, TRUE );
break;
case 'O': tr_bencDictAddBool( &settings, TR_PREFS_KEY_DHT_ENABLED, FALSE );
break;
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 800: paused = TRUE;
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;
case 'i': tr_bencDictAddStr( &settings, TR_PREFS_KEY_BIND_ADDRESS_IPV4, optarg );
break;
case 'I': tr_bencDictAddStr( &settings, TR_PREFS_KEY_BIND_ADDRESS_IPV6, optarg );
break;
case 'r': tr_bencDictAddStr( &settings, TR_PREFS_KEY_RPC_BIND_ADDRESS, optarg );
break;
case 953: tr_bencDictAddReal( &settings, TR_PREFS_KEY_RATIO, atof(optarg) );
tr_bencDictAddBool( &settings, TR_PREFS_KEY_RATIO_ENABLED, TRUE );
break;
case 954: tr_bencDictAddBool( &settings, TR_PREFS_KEY_RATIO_ENABLED, FALSE );
break;
case 'x': pid_filename = optarg;
break;
case 'y': tr_bencDictAddBool( &settings, TR_PREFS_KEY_LPD_ENABLED, TRUE );
break;
case 'Y': tr_bencDictAddBool( &settings, TR_PREFS_KEY_LPD_ENABLED, FALSE );
break;
default: showUsage( );
break;
}
}
if( foreground && !logfile )
logfile = stderr;
if( !loaded )
{
printMessage( logfile, TR_MSG_ERR, MY_NAME, "Error loading config file -- exiting.", __FILE__, __LINE__ );
return -1;
}
if( dumpSettings )
{
char * str = tr_bencToStr( &settings, TR_FMT_JSON, NULL );
fprintf( stderr, "%s", str );
tr_free( str );
return 0;
}
if( !foreground && tr_daemon( TRUE, FALSE ) < 0 )
{
char buf[256];
tr_snprintf( buf, sizeof( buf ), "Failed to daemonize: %s", tr_strerror( errno ) );
printMessage( logfile, TR_MSG_ERR, MY_NAME, buf, __FILE__, __LINE__ );
exit( 1 );
}
/* start the session */
mySession = tr_sessionInit( "daemon", configDir, TRUE, &settings );
tr_ninf( NULL, "Using settings from \"%s\"", configDir );
tr_sessionSaveSettings( mySession, configDir, &settings );
if( pid_filename != NULL )
{
FILE * fp = fopen( pid_filename, "w+" );
if( fp != NULL )
{
fprintf( fp, "%d", (int)getpid() );
fclose( fp );
tr_inf( "Saved pidfile \"%s\"", pid_filename );
pidfile_created = TRUE;
}
else
tr_err( "Unable to save pidfile \"%s\": %s", pid_filename, strerror( errno ) );
}
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_torrent ** torrents;
tr_ctor * ctor = tr_ctorNew( mySession );
if( paused )
tr_ctorSetPaused( ctor, TR_FORCE, TRUE );
torrents = tr_sessionLoadTorrents( mySession, ctor, NULL );
tr_free( torrents );
tr_ctorFree( ctor );
}
#ifdef HAVE_SYSLOG
if( !foreground )
openlog( MY_NAME, LOG_CONS|LOG_PID, LOG_DAEMON );
#endif
while( !closing ) {
tr_wait_msec( 1000 ); /* sleep one second */
dtr_watchdir_update( watchdir );
pumpLogMessages( logfile );
}
/* shutdown */
#if HAVE_SYSLOG
if( !foreground )
{
syslog( LOG_INFO, "%s", "Closing session" );
closelog( );
}
#endif
printf( "Closing transmission session..." );
tr_sessionSaveSettings( mySession, configDir, &settings );
dtr_watchdir_free( watchdir );
tr_sessionClose( mySession );
printf( " done.\n" );
/* cleanup */
if( pidfile_created )
remove( pid_filename );
tr_bencFree( &settings );
return 0;
}
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