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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, getcwd */
#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include <libtransmission/rpc.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_handle * mySession;
static char myConfigFilename[MAX_PATH_LENGTH];
#define KEY_BLOCKLIST "blocklist-enabled"
#define KEY_DOWNLOAD_DIR "download-dir"
#define KEY_ENCRYPTION "encryption"
#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_ACL "rpc-access-control-list"
#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_ACL, strs[n++] = tr_sessionGetRPCACL( 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 * acl,
int authRequired, const char * username, const char * password,
int blocklistEnabled )
{
char mycwd[MAX_PATH_LENGTH];
tr_benc state, *dict = NULL;
int peerPort=-1, peers=-1;
int pexEnabled = -1;
int fwdEnabled = -1;
int upLimit=-1, upLimited=-1, downLimit=-1, downLimited=-1;
int encryption = -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 .
***/
getcwd( mycwd, sizeof( mycwd ) );
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_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 );
getConfigStr( dict, KEY_ACL, &acl, TR_DEFAULT_RPC_ACL );
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_ENCRYPTION_PREFERRED );
/***
****
***/
/* start the session */
mySession = tr_sessionInitFull( configDir, "daemon", downloadDir,
pexEnabled, fwdEnabled, peerPort,
encryption,
upLimited, upLimit,
downLimited, downLimit,
peers,
TR_MSG_INF, 0,
blocklistEnabled,
TR_DEFAULT_PEER_SOCKET_TOS,
TRUE, rpcPort, acl, 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 );
}
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', "acl", "Access Control List. (Default: "TR_DEFAULT_RPC_ACL")", "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 ** acl,
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': *acl = 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(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
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 * acl = NULL;
const char * username = NULL;
const char * password = NULL;
signal( SIGINT, gotsig );
signal( SIGQUIT, gotsig );
signal( SIGTERM, gotsig );
signal( SIGPIPE, SIG_IGN );
signal( SIGHUP, SIG_IGN );
readargs( argc, (const char**)argv, &nofork, &configDir, &downloadDir,
&rpcPort, &acl, &authRequired, &username, &password,
&blocklistEnabled );
if( configDir == NULL )
configDir = freeme = tr_strdup_printf( "%s-daemon", tr_getDefaultConfigDir() );
tr_buildPath( myConfigFilename, sizeof( myConfigFilename ),
configDir, CONFIG_FILE, NULL );
if( !nofork ) {
if( 0 > daemon( 1, 0 ) ) {
fprintf( stderr, "failed to daemonize: %s\n", strerror( errno ) );
exit( 1 );
}
}
session_init( configDir, downloadDir,
rpcPort, acl, authRequired, username, password,
blocklistEnabled );
while( !closing )
sleep( 1 );
saveState( mySession );
printf( "Closing transmission session..." );
tr_sessionClose( mySession );
printf( " done.\n" );
tr_free( freeme );
return 0;
}
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