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transmission/daemon/daemon.c

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/*
* This file Copyright (C) 2008 Charles Kerr <charles@rebelbase.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 <fcntl.h> /* open */
#include <signal.h>
#include <unistd.h> /* daemon */
#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include <libtransmission/rpcimpl.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/utils.h>
#include <libtransmission/version.h>
#define MY_NAME "transmission-daemon"
static int closing = FALSE;
static tr_session * mySession = NULL;
static char * myConfigFilename = NULL;
#define KEY_BLOCKLIST "blocklist-enabled"
#define KEY_DOWNLOAD_DIR "download-dir"
#define KEY_ENCRYPTION "encryption"
#define KEY_LAZY_BITFIELD "lazy-bitfield-enabled"
#define KEY_PEER_LIMIT "max-peers-global"
#define KEY_PEER_PORT "peer-port"
#define KEY_PORT_FORWARDING "port-forwarding-enabled"
#define KEY_PEX_ENABLED "pex-enabled"
#define KEY_AUTH_REQUIRED "rpc-authentication-required"
#define KEY_USERNAME "rpc-username"
#define KEY_PASSWORD "rpc-password"
#define KEY_WHITELIST "rpc-whitelist"
#define KEY_WHITELIST_ENABLED "rpc-whitelist-enabled"
#define KEY_RPC_PORT "rpc-port"
#define KEY_DSPEED "download-limit"
#define KEY_DSPEED_ENABLED "download-limit-enabled"
#define KEY_USPEED "upload-limit"
#define KEY_USPEED_ENABLED "upload-limit-enabled"
#define CONFIG_FILE "settings.json"
/***
**** Config File
***/
static void
replaceInt( tr_benc * dict,
const char * key,
int64_t value )
{
tr_bencDictRemove( dict, key );
tr_bencDictAddInt( dict, key, value );
}
static void
replaceStr( tr_benc * dict,
const char * key,
const char* value )
{
tr_bencDictRemove( dict, key );
tr_bencDictAddStr( dict, key, value );
}
static void
saveState( tr_session * s )
{
int i, n = 0;
char * strs[4];
tr_benc d;
if( tr_bencLoadJSONFile( myConfigFilename, &d ) )
tr_bencInitDict( &d, 16 );
replaceInt( &d, KEY_BLOCKLIST, tr_blocklistIsEnabled( s ) );
replaceStr( &d, KEY_DOWNLOAD_DIR, tr_sessionGetDownloadDir( s ) );
replaceInt( &d, KEY_PEER_LIMIT, tr_sessionGetPeerLimit( s ) );
replaceInt( &d, KEY_PEER_PORT, tr_sessionGetPeerPort( s ) );
replaceInt( &d, KEY_PORT_FORWARDING,
tr_sessionIsPortForwardingEnabled( s ) );
replaceInt( &d, KEY_PEX_ENABLED, tr_sessionIsPexEnabled( s ) );
replaceStr( &d, KEY_USERNAME, strs[n++] =
tr_sessionGetRPCUsername(
s ) );
replaceStr( &d, KEY_PASSWORD, strs[n++] =
tr_sessionGetRPCPassword(
s ) );
replaceStr( &d, KEY_WHITELIST, strs[n++] = tr_sessionGetRPCWhitelist( s ) );
replaceInt( &d, KEY_RPC_PORT, tr_sessionGetRPCPort( s ) );
replaceInt( &d, KEY_AUTH_REQUIRED, tr_sessionIsRPCPasswordEnabled( s ) );
replaceInt( &d, KEY_DSPEED,
tr_sessionGetSpeedLimit( s, TR_DOWN ) );
replaceInt( &d, KEY_DSPEED_ENABLED,
tr_sessionIsSpeedLimitEnabled( s, TR_DOWN ) );
replaceInt( &d, KEY_USPEED, tr_sessionGetSpeedLimit( s, TR_UP ) );
replaceInt( &d, KEY_USPEED_ENABLED,
tr_sessionIsSpeedLimitEnabled( s, TR_UP ) );
replaceInt( &d, KEY_ENCRYPTION, tr_sessionGetEncryption( s ) );
tr_bencSaveJSONFile( myConfigFilename, &d );
tr_bencFree( &d );
tr_ninf( MY_NAME, "saved \"%s\"", myConfigFilename );
for( i = 0; i < n; ++i )
tr_free( strs[i] );
}
static void
getConfigInt( tr_benc * dict,
const char * key,
int * setme,
int defaultVal )
{
if( *setme < 0 )
{
int64_t i;
if( tr_bencDictFindInt( dict, key, &i ) )
*setme = i;
else
*setme = defaultVal;
}
}
static void
getConfigStr( tr_benc * dict,
const char * key,
const char ** setme,
const char * defaultVal )
{
if( !*setme )
{
const char * s;
if( tr_bencDictFindStr( dict, key, &s ) )
*setme = s;
else
*setme = defaultVal;
}
}
/**
* @param port port number, or -1 if not set in the command line
* @param auth TRUE, FALSE, or -1 if not set on the command line
* @param blocklist TRUE, FALSE, or -1 if not set on the command line
*/
static void
session_init( const char * configDir,
const char * downloadDir,
int rpcPort,
const char * whitelist,
int authRequired,
const char * username,
const char * password,
int blocklistEnabled )
{
char * mycwd;
tr_benc state, *dict = NULL;
int peerPort = -1, peers = -1;
int whitelistEnabled = -1;
int pexEnabled = -1;
int fwdEnabled = -1;
int upLimit = -1, upLimited = -1, downLimit = -1,
downLimited = -1;
int encryption = -1;
int useLazyBitfield = -1;
tr_ctor * ctor;
tr_torrent ** torrents;
if( !tr_bencLoadJSONFile( myConfigFilename, &state ) )
dict = &state;
/***
**** Decide on which values to pass into tr_sessionInitFull().
**** The command-line arguments are given precedence and
**** the state file from the previous session is used as a fallback.
**** If neither of those can be found, the TR_DEFAULT fields are used .
***/
mycwd = tr_getcwd( );
getConfigStr( dict, KEY_DOWNLOAD_DIR, &downloadDir, mycwd );
getConfigInt( dict, KEY_PEX_ENABLED, &pexEnabled,
TR_DEFAULT_PEX_ENABLED );
getConfigInt( dict, KEY_PORT_FORWARDING, &fwdEnabled,
TR_DEFAULT_PORT_FORWARDING_ENABLED );
getConfigInt( dict, KEY_PEER_PORT, &peerPort,
TR_DEFAULT_PORT );
getConfigInt( dict, KEY_DSPEED, &downLimit, 100 );
getConfigInt( dict, KEY_DSPEED_ENABLED, &downLimited, FALSE );
getConfigInt( dict, KEY_USPEED, &upLimit, 100 );
getConfigInt( dict, KEY_USPEED_ENABLED, &upLimited, FALSE );
getConfigInt( dict, KEY_LAZY_BITFIELD, &useLazyBitfield,
TR_DEFAULT_LAZY_BITFIELD_ENABLED );
getConfigInt( dict, KEY_PEER_LIMIT, &peers,
TR_DEFAULT_GLOBAL_PEER_LIMIT );
getConfigInt( dict, KEY_BLOCKLIST, &blocklistEnabled,
TR_DEFAULT_BLOCKLIST_ENABLED );
getConfigInt( dict, KEY_RPC_PORT, &rpcPort,
TR_DEFAULT_RPC_PORT );
getConfigInt( dict, KEY_WHITELIST_ENABLED, &whitelistEnabled,
TR_DEFAULT_RPC_WHITELIST_ENABLED );
getConfigStr( dict, KEY_WHITELIST, &whitelist,
TR_DEFAULT_RPC_WHITELIST );
getConfigInt( dict, KEY_AUTH_REQUIRED, &authRequired, FALSE );
getConfigStr( dict, KEY_USERNAME, &username, NULL );
getConfigStr( dict, KEY_PASSWORD, &password, NULL );
getConfigInt( dict, KEY_ENCRYPTION, &encryption,
TR_DEFAULT_ENCRYPTION );
/***
****
***/
/* start the session */
mySession = tr_sessionInitFull( configDir, "daemon", downloadDir,
pexEnabled, fwdEnabled, peerPort,
encryption,
useLazyBitfield,
upLimited, upLimit,
downLimited, downLimit,
peers,
TR_MSG_INF, 0,
blocklistEnabled,
TR_DEFAULT_PEER_SOCKET_TOS,
TRUE, rpcPort,
whitelistEnabled, whitelist,
authRequired, username, password,
TR_DEFAULT_PROXY_ENABLED,
TR_DEFAULT_PROXY,
TR_DEFAULT_PROXY_PORT,
TR_DEFAULT_PROXY_TYPE,
TR_DEFAULT_PROXY_AUTH_ENABLED,
TR_DEFAULT_PROXY_USERNAME,
TR_DEFAULT_PROXY_PASSWORD );
if( authRequired )
tr_ninf( MY_NAME, "requiring authentication" );
/* load the torrents */
ctor = tr_ctorNew( mySession );
torrents = tr_sessionLoadTorrents( mySession, ctor, NULL );
tr_free( torrents );
tr_ctorFree( ctor );
if( dict )
tr_bencFree( &state );
tr_free( mycwd );
}
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 },
{ '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>" },
{ 'w', "download-dir", "Where to save downloaded data",
"w", 1, "<path>" },
{ 0, NULL, NULL,
NULL, 0, NULL }
};
static void
showUsage( void )
{
tr_getopt_usage( MY_NAME, getUsage( ), options );
exit( 0 );
}
static void
readargs( int argc,
const char ** argv,
int * nofork,
const char ** configDir,
const char ** downloadDir,
int * rpcPort,
const char ** whitelist,
int * authRequired,
const char ** username,
const char ** password,
int * blocklistEnabled )
{
int c;
const char * optarg;
while( ( c = tr_getopt( getUsage( ), argc, argv, options, &optarg ) ) )
{
switch( c )
{
case 'a':
*whitelist = optarg; break;
case 'b':
*blocklistEnabled = 1; break;
case 'B':
*blocklistEnabled = 0; break;
case 'f':
*nofork = 1; break;
case 'g':
*configDir = optarg; break;
case 'p':
*rpcPort = atoi( optarg ); break;
case 't':
*authRequired = TRUE; break;
case 'T':
*authRequired = FALSE; break;
case 'u':
*username = optarg; break;
case 'v':
*password = optarg; break;
case 'w':
*downloadDir = optarg; break;
default:
showUsage( ); break;
}
}
}
static void
gotsig( int sig UNUSED )
{
closing = TRUE;
}
#if !defined( WIN32 )
#if !defined( HAVE_DAEMON )
static int
daemon( int nochdir,
int noclose )
{
switch( fork( ) )
{
case 0:
break;
case - 1:
tr_nerr( MY_NAME, "Error daemonizing (fork)! %d - %s", errno,
strerror(
errno ) );
return -1;
default:
_exit( 0 );
}
if( setsid( ) < 0 )
{
tr_nerr( MY_NAME, "Error daemonizing (setsid)! %d - %s", errno,
strerror(
errno ) );
return -1;
}
switch( fork( ) )
{
case 0:
break;
case - 1:
tr_nerr( MY_NAME, "Error daemonizing (fork2)! %d - %s", errno,
strerror(
errno ) );
return -1;
default:
_exit( 0 );
}
if( !nochdir && 0 > chdir( "/" ) )
{
tr_nerr( MY_NAME, "Error daemonizing (chdir)! %d - %s", errno,
strerror(
errno ) );
return -1;
}
if( !noclose )
{
int fd;
if( ( ( fd = open( "/dev/null", O_RDONLY ) ) ) != 0 )
{
dup2( fd, 0 );
close( fd );
}
if( ( ( fd = open( "/dev/null", O_WRONLY ) ) ) != 1 )
{
dup2( fd, 1 );
close( fd );
}
if( ( ( fd = open( "/dev/null", O_WRONLY ) ) ) != 2 )
{
dup2( fd, 2 );
close( fd );
}
}
return 0;
}
#endif
#endif
int
main( int argc,
char ** argv )
{
int nofork = 0;
int rpcPort = -1;
int authRequired = -1;
int blocklistEnabled = -1;
char * freeme = NULL;
const char * configDir = NULL;
const char * downloadDir = NULL;
const char * whitelist = NULL;
const char * username = NULL;
const char * password = NULL;
signal( SIGINT, gotsig );
signal( SIGTERM, gotsig );
#ifndef WIN32
signal( SIGQUIT, gotsig );
signal( SIGPIPE, SIG_IGN );
signal( SIGHUP, SIG_IGN );
#endif
readargs( argc, (const char**)argv, &nofork, &configDir, &downloadDir,
&rpcPort, &whitelist, &authRequired, &username, &password,
&blocklistEnabled );
if( configDir == NULL )
configDir = getenv( "TRANSMISSION_HOME" );
if( configDir == NULL )
configDir = freeme = tr_strdup_printf( "%s-daemon",
tr_getDefaultConfigDir( ) );
myConfigFilename = tr_buildPath( configDir, CONFIG_FILE, NULL );
#ifndef WIN32
if( !nofork )
{
if( 0 > daemon( 1, 0 ) )
{
fprintf( stderr, "failed to daemonize: %s\n", strerror( errno ) );
exit( 1 );
}
}
#endif
session_init( configDir, downloadDir,
rpcPort, whitelist, authRequired, username, password,
blocklistEnabled );
while( !closing )
tr_wait( 1000 ); /* sleep one second */
saveState( mySession );
printf( "Closing transmission session..." );
tr_sessionClose( mySession );
printf( " done.\n" );
tr_free( freeme );
tr_free( myConfigFilename );
return 0;
}
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