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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 <getopt.h>
#include <signal.h>
#include <unistd.h> /* daemon, getcwd */
#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include <libtransmission/rpc.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 "peer-limit"
#define KEY_PEER_PORT "peer-port"
#define KEY_PORT_FORWARDING "port-forwarding-enabled"
#define KEY_PEX_ENABLED "pex-enabled"
#define KEY_AUTH_REQUIRED "rpc-auth-required"
#define KEY_USERNAME "rpc-username"
#define KEY_PASSWORD "rpc-password"
#define KEY_ACL "rpc-acl"
#define KEY_RPC_PORT "rpc-port"
#define KEY_DSPEED "speed-limit-down"
#define KEY_DSPEED_ENABLED "speed-limit-down-enabled"
#define KEY_USPEED "speed-limit-up"
#define KEY_USPEED_ENABLED "speed-limit-up-enabled"
#define CONFIG_FILE "session.json"
const char * encryption_str[3] = { "tolerated", "preferred", "required" };
static void
saveState( tr_session * s )
{
tr_benc d;
fprintf( stderr, "tr_sessionGetDownloadDir(s) returned [%s]\n", tr_sessionGetDownloadDir(s));
tr_bencInitDict( &d, 16 );
tr_bencDictAddInt( &d, KEY_BLOCKLIST, tr_blocklistIsEnabled( s ) );
tr_bencDictAddStr( &d, KEY_DOWNLOAD_DIR, tr_sessionGetDownloadDir( s ) );
tr_bencDictAddInt( &d, KEY_PEER_LIMIT, tr_sessionGetPeerLimit( s ) );
tr_bencDictAddInt( &d, KEY_PEER_PORT, tr_sessionGetPeerPort( s ) );
tr_bencDictAddInt( &d, KEY_PORT_FORWARDING, tr_sessionIsPortForwardingEnabled( s ) );
tr_bencDictAddInt( &d, KEY_PEX_ENABLED, tr_sessionIsPexEnabled( s ) );
tr_bencDictAddStr( &d, KEY_USERNAME, tr_sessionGetRPCUsername( s ) );
tr_bencDictAddStr( &d, KEY_PASSWORD, tr_sessionGetRPCPassword( s ) );
tr_bencDictAddStr( &d, KEY_ACL, tr_sessionGetRPCACL( s ) );
tr_bencDictAddInt( &d, KEY_RPC_PORT, tr_sessionGetRPCPort( s ) );
tr_bencDictAddInt( &d, KEY_AUTH_REQUIRED, tr_sessionIsRPCPasswordEnabled( s ) );
tr_bencDictAddInt( &d, KEY_DSPEED, tr_sessionGetSpeedLimit( s, TR_DOWN ) );
tr_bencDictAddInt( &d, KEY_DSPEED_ENABLED, tr_sessionIsSpeedLimitEnabled( s, TR_DOWN ) );
tr_bencDictAddInt( &d, KEY_USPEED, tr_sessionGetSpeedLimit( s, TR_UP ) );
tr_bencDictAddInt( &d, KEY_USPEED_ENABLED, tr_sessionIsSpeedLimitEnabled( s, TR_UP ) );
tr_bencDictAddStr( &d, KEY_ENCRYPTION, encryption_str[tr_sessionGetEncryption( s )] );
tr_bencSaveJSONFile( myConfigFilename, &d );
fprintf( stderr, "saved:\n%s\n", tr_bencSaveAsJSON(&d,NULL) );
tr_bencFree( &d );
tr_ninf( MY_NAME, "saved \"%s\"", myConfigFilename );
}
/**
* @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;
int have_state;
int64_t i;
int64_t peer_port = TR_DEFAULT_PORT;
int64_t peers = TR_DEFAULT_GLOBAL_PEER_LIMIT;
int64_t pex_enabled = TR_DEFAULT_PEX_ENABLED;
int64_t fwd_enabled = TR_DEFAULT_PORT_FORWARDING_ENABLED;
int64_t up_limit = 100;
int64_t up_limited = FALSE;
int64_t down_limit = 100;
int64_t down_limited = FALSE;
int encryption = TR_ENCRYPTION_PREFERRED;
tr_ctor * ctor;
tr_torrent ** torrents;
if(( have_state = !tr_bencLoadJSONFile( myConfigFilename, &state )))
{
const char * str;
tr_ninf( MY_NAME, "loading settings from \"%s\"", myConfigFilename );
tr_bencDictFindInt( &state, KEY_PEER_LIMIT, &peers );
tr_bencDictFindInt( &state, KEY_PEX_ENABLED, &pex_enabled );
tr_bencDictFindInt( &state, KEY_PEER_PORT, &peer_port );
tr_bencDictFindInt( &state, KEY_PORT_FORWARDING, &fwd_enabled );
tr_bencDictFindInt( &state, KEY_DSPEED, &down_limit );
tr_bencDictFindInt( &state, KEY_DSPEED_ENABLED, &down_limited );
tr_bencDictFindInt( &state, KEY_USPEED, &up_limit );
tr_bencDictFindInt( &state, KEY_USPEED_ENABLED, &up_limited );
if( tr_bencDictFindStr( &state, KEY_ENCRYPTION, &str ) ) {
if( !strcmp( str, "required" ) )
encryption = TR_ENCRYPTION_REQUIRED;
else if( !strcmp( str, "tolerated" ) )
encryption = TR_PLAINTEXT_PREFERRED;
}
}
/***
**** 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 .
***/
/* authorization */
if( authRequired < 0 ) {
if( have_state && tr_bencDictFindInt( &state, KEY_AUTH_REQUIRED, &i ) )
authRequired = i;
if( authRequired < 0 )
authRequired = FALSE;
}
/* username */
if( !username )
tr_bencDictFindStr( &state, KEY_USERNAME, &username );
/* password */
if( !password )
tr_bencDictFindStr( &state, KEY_PASSWORD, &password );
/* acl */
if( !acl ) {
if( have_state )
tr_bencDictFindStr( &state, KEY_ACL, &acl );
if( !acl )
acl = TR_DEFAULT_RPC_ACL;
}
/* rpc port */
if( rpcPort < 0 ) {
if( have_state && tr_bencDictFindInt( &state, KEY_RPC_PORT, &i ) )
rpcPort = i;
if( rpcPort < 0 )
rpcPort = TR_DEFAULT_RPC_PORT;
}
/* blocklist */
if( blocklistEnabled < 0 ) {
if( have_state && tr_bencDictFindInt( &state, KEY_BLOCKLIST, &i ) )
blocklistEnabled = i;
if( blocklistEnabled < 0 )
blocklistEnabled = TR_DEFAULT_BLOCKLIST_ENABLED;
}
/* download dir */
if( !downloadDir ) {
if( have_state )
tr_bencDictFindStr( &state, KEY_DOWNLOAD_DIR, &downloadDir );
if( !downloadDir ) {
getcwd( mycwd, sizeof( mycwd ) );
fprintf( stderr, "cwd is [%s]\n", mycwd );
downloadDir = mycwd;
}
}
/***
****
***/
/* start the session */
mySession = tr_sessionInitFull( configDir, "daemon", downloadDir,
pex_enabled, fwd_enabled, peer_port,
encryption,
up_limit, up_limited,
down_limit, down_limited,
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_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( have_state )
tr_bencFree( &state );
}
static void
daemonUsage( void )
{
puts( "usage: " MY_NAME " [-dfh] [-p file] [-s file]\n"
"\n"
"Transmission "LONG_VERSION_STRING" http://www.transmissionbt.com/\n"
"A fast and easy BitTorrent client\n"
"\n"
" -a --acl <list> Access Control List. (Default: "TR_DEFAULT_RPC_ACL")\n"
" -b --blocklist Enable peer blocklists\n"
" -b0 --blocklist=0 Disable peer blocklists\n"
" -d --download-dir <dir> Where store downloaded data\n"
" -f --foreground Run in the foreground and log to stderr\n"
" -g --config-dir <dir> Where to look for torrents and "CONFIG_FILE"\n"
" -h --help Display this message and exit\n"
" -p --port=n Port to listen to for requests (Default: "TR_DEFAULT_RPC_PORT_STR")\n"
" -t --auth Require authentication\n"
" -t0 --auth=0 Don't require authentication\n"
" -u --username <user> Set username for authentication\n"
" -w --password <pass> Set password for authentication\n"
"\n"
MY_NAME" is a headless Transmission session\n"
"that can be controlled via transmission-remote or Clutch.\n" );
exit( 0 );
}
static void
readargs( int argc, char ** argv,
int * nofork, char ** configDir, char ** downloadDir,
int * rpcPort, char ** acl, int * authRequired, char ** username, char ** password,
int * blocklistEnabled )
{
int opt;
char shortopts[] = "a:b::d:fg:hp:t::u:w:";
struct option longopts[] = {
{ "acl", required_argument, NULL, 'a' },
{ "blocklist", optional_argument, NULL, 'b' },
{ "download-dir", required_argument, NULL, 'd' },
{ "foreground", no_argument, NULL, 'f' },
{ "config-dir", required_argument, NULL, 'g' },
{ "help", no_argument, NULL, 'h' },
{ "port", required_argument, NULL, 'p' },
{ "auth", optional_argument, NULL, 't' },
{ "username", required_argument, NULL, 'u' },
{ "password", required_argument, NULL, 'w' },
{ NULL, 0, NULL, '\0' }
};
while((( opt = getopt_long( argc, argv, shortopts, longopts, NULL ))) != -1 ) {
switch( opt ) {
case 'a': *acl = tr_strdup( optarg ); break;
case 'b': *blocklistEnabled = optarg ? atoi(optarg)!=0 : TRUE; break;
case 'd': *downloadDir = tr_strdup( optarg ); break;
case 'f': *nofork = 1; break;
case 'n': *authRequired = FALSE; break;
case 'g': *configDir = tr_strdup( optarg ); break;
case 't': *authRequired = optarg ? atoi(optarg)!=0 : TRUE; break;
case 'u': *username = tr_strdup( optarg ); break;
case 'w': *password = tr_strdup( optarg ); break;
case 'p': *rpcPort = atoi( optarg ); break;
default: daemonUsage( ); 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 * configDir = NULL;
char * downloadDir = NULL;
char * acl = NULL;
char * username = NULL;
char * password = NULL;
signal( SIGINT, gotsig );
signal( SIGQUIT, gotsig );
signal( SIGTERM, gotsig );
signal( SIGPIPE, SIG_IGN );
signal( SIGHUP, SIG_IGN );
readargs( argc, argv, &nofork, &configDir, &downloadDir,
&rpcPort, &acl, &authRequired, &username, &password,
&blocklistEnabled );
if( configDir == NULL )
configDir = 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( configDir );
tr_free( downloadDir );
tr_free( username );
tr_free( password );
tr_free( acl );
return 0;
}
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