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transmission/daemon/daemon.c

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/*
* This file Copyright (C) 2008-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#include <errno.h>
#include <stdio.h> /* printf */
#include <stdlib.h> /* exit, atoi */
#include <fcntl.h> /* open */
#include <signal.h>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif
#include <unistd.h> /* daemon */
#include <event2/buffer.h>
#include <event2/event.h>
#include <libtransmission/transmission.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/log.h>
#include <libtransmission/utils.h>
#include <libtransmission/variant.h>
#include <libtransmission/version.h>
#ifdef USE_SYSTEMD_DAEMON
#include <systemd/sd-daemon.h>
#else
static void sd_notify (int status UNUSED, const char * str UNUSED) { }
static void sd_notifyf (int status UNUSED, const char * fmt UNUSED, ...) { }
#endif
#include "watch.h"
#define MY_NAME "transmission-daemon"
#define MEM_K 1024
#define MEM_K_STR "KiB"
#define MEM_M_STR "MiB"
#define MEM_G_STR "GiB"
#define MEM_T_STR "TiB"
#define DISK_K 1000
#define DISK_B_STR "B"
#define DISK_K_STR "kB"
#define DISK_M_STR "MB"
#define DISK_G_STR "GB"
#define DISK_T_STR "TB"
#define SPEED_K 1000
#define SPEED_B_STR "B/s"
#define SPEED_K_STR "kB/s"
#define SPEED_M_STR "MB/s"
#define SPEED_G_STR "GB/s"
#define SPEED_T_STR "TB/s"
#define LOGFILE_MODE_STR "a+"
static bool paused = false;
static bool seenHUP = false;
static const char *logfileName = NULL;
static FILE *logfile = NULL;
static tr_session * mySession = NULL;
static tr_quark key_pidfile = 0;
static struct event_base *ev_base = 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", "Where 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 },
{ 810, "log-error", "Show error messages", NULL, 0, NULL },
{ 811, "log-info", "Show error and info messages", NULL, 0, NULL },
{ 812, "log-debug", "Show error, info, and debug messages", NULL, 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 },
{ 830, "utp", "Enable uTP for peer connections", NULL, 0, NULL },
{ 831, "no-utp", "Disable uTP for peer connections", NULL, 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 addr>" },
{ 'I', "bind-address-ipv6", "Where to listen for peer connections", "I", 1, "<ipv6 addr>" },
{ 'r', "rpc-bind-address", "Where to listen for RPC connections", "r", 1, "<ipv4 addr>" },
{ 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:
{
if (!mySession)
{
tr_logAddInfo ("Deferring reload until session is fully started.");
seenHUP = true;
}
else
{
tr_variant settings;
const char * configDir;
/* reopen the logfile to allow for log rotation */
if (logfileName) {
logfile = freopen (logfileName, LOGFILE_MODE_STR, logfile);
if (!logfile)
fprintf (stderr, "Couldn't reopen \"%s\": %s\n", logfileName, tr_strerror (errno));
}
configDir = tr_sessionGetConfigDir (mySession);
tr_logAddInfo ("Reloading settings from \"%s\"", configDir);
tr_variantInitDict (&settings, 0);
tr_variantDictAddBool (&settings, TR_KEY_rpc_enabled, true);
tr_sessionLoadSettings (&settings, configDir, MY_NAME);
tr_sessionSet (mySession, &settings);
tr_variantFree (&settings);
tr_sessionReloadBlocklists (mySession);
}
break;
}
default:
tr_logAddError ("Unexpected signal (%d) in daemon, closing.", sig);
/* no break */
case SIGINT:
case SIGTERM:
event_base_loopexit(ev_base, NULL);
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)
/* this is loosely based off of glibc's daemon () implementation
* http://sourceware.org/git/?p=glibc.git;a=blob_plain;f=misc/daemon.c */
switch (fork ()) {
case -1: return -1;
case 0: break;
default: _exit (0);
}
if (setsid () == -1)
return -1;
if (!nochdir)
chdir ("/");
if (!noclose) {
int fd = open ("/dev/null", O_RDWR, 0);
dup2 (fd, STDIN_FILENO);
dup2 (fd, STDOUT_FILENO);
dup2 (fd, STDERR_FILENO);
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, NULL);
if (err == TR_PARSE_ERR)
tr_logAddError ("Error parsing .torrent file \"%s\"", file);
else
{
bool trash = false;
int test = tr_ctorGetDeleteSource (ctor, &trash);
tr_logAddInfo ("Parsing .torrent file successful \"%s\"", file);
if (!test && trash)
{
tr_logAddInfo ("Deleting input .torrent file \"%s\"", file);
if (tr_remove (filename))
tr_logAddError ("Error deleting .torrent file: %s", tr_strerror (errno));
}
else
{
char * new_filename = tr_strdup_printf ("%s.added", filename);
tr_rename (filename, new_filename);
tr_free (new_filename);
}
}
}
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_logGetTimeStr (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_LOG_ERROR: priority = LOG_ERR; break;
case TR_LOG_DEBUG: 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_log_message * l;
tr_log_message * list = tr_logGetQueue ();
for (l=list; l!=NULL; l=l->next)
printMessage (logfile, l->level, l->name, l->message, l->file, l->line);
if (logfile != NULL)
fflush (logfile);
tr_logFreeQueue (list);
}
static void
reportStatus (void)
{
const double up = tr_sessionGetRawSpeed_KBps (mySession, TR_UP);
const double dn = tr_sessionGetRawSpeed_KBps (mySession, TR_DOWN);
if (up>0 || dn>0)
sd_notifyf (0, "STATUS=Uploading %.2f KBps, Downloading %.2f KBps.\n", up, dn);
else
sd_notify (0, "STATUS=Idle.\n");
}
static void
periodicUpdate (evutil_socket_t fd UNUSED, short what UNUSED, void *watchdir)
{
dtr_watchdir_update (watchdir);
pumpLogMessages (logfile);
reportStatus ();
}
static tr_rpc_callback_status
on_rpc_callback (tr_session * session UNUSED,
tr_rpc_callback_type type,
struct tr_torrent * tor UNUSED,
void * user_data UNUSED)
{
if (type == TR_RPC_SESSION_CLOSE)
event_base_loopexit(ev_base, NULL);
return TR_RPC_OK;
}
int
main (int argc, char ** argv)
{
int c;
const char * optarg;
tr_variant settings;
bool boolVal;
bool loaded;
bool foreground = false;
bool dumpSettings = false;
const char * configDir = NULL;
const char * pid_filename;
dtr_watchdir * watchdir = NULL;
bool pidfile_created = false;
tr_session * session = NULL;
struct event *status_ev;
key_pidfile = tr_quark_new ("pidfile", 7);
signal (SIGINT, gotsig);
signal (SIGTERM, gotsig);
#ifndef WIN32
signal (SIGHUP, gotsig);
#endif
/* load settings from defaults + config file */
tr_variantInitDict (&settings, 0);
tr_variantDictAddBool (&settings, TR_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_variantDictAddStr (&settings, TR_KEY_rpc_whitelist, optarg);
tr_variantDictAddBool (&settings, TR_KEY_rpc_whitelist_enabled, true);
break;
case 'b': tr_variantDictAddBool (&settings, TR_KEY_blocklist_enabled, true);
break;
case 'B': tr_variantDictAddBool (&settings, TR_KEY_blocklist_enabled, false);
break;
case 'c': tr_variantDictAddStr (&settings, TR_KEY_watch_dir, optarg);
tr_variantDictAddBool (&settings, TR_KEY_watch_dir_enabled, true);
break;
case 'C': tr_variantDictAddBool (&settings, TR_KEY_watch_dir_enabled, false);
break;
case 941: tr_variantDictAddStr (&settings, TR_KEY_incomplete_dir, optarg);
tr_variantDictAddBool (&settings, TR_KEY_incomplete_dir_enabled, true);
break;
case 942: tr_variantDictAddBool (&settings, TR_KEY_incomplete_dir_enabled, false);
break;
case 'd': dumpSettings = true;
break;
case 'e': logfile = fopen (optarg, LOGFILE_MODE_STR);
if (logfile)
logfileName = optarg;
else
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, "%s %s\n", MY_NAME, LONG_VERSION_STRING);
exit (0);
case 'o': tr_variantDictAddBool (&settings, TR_KEY_dht_enabled, true);
break;
case 'O': tr_variantDictAddBool (&settings, TR_KEY_dht_enabled, false);
break;
case 'p': tr_variantDictAddInt (&settings, TR_KEY_rpc_port, atoi (optarg));
break;
case 't': tr_variantDictAddBool (&settings, TR_KEY_rpc_authentication_required, true);
break;
case 'T': tr_variantDictAddBool (&settings, TR_KEY_rpc_authentication_required, false);
break;
case 'u': tr_variantDictAddStr (&settings, TR_KEY_rpc_username, optarg);
break;
case 'v': tr_variantDictAddStr (&settings, TR_KEY_rpc_password, optarg);
break;
case 'w': tr_variantDictAddStr (&settings, TR_KEY_download_dir, optarg);
break;
case 'P': tr_variantDictAddInt (&settings, TR_KEY_peer_port, atoi (optarg));
break;
case 'm': tr_variantDictAddBool (&settings, TR_KEY_port_forwarding_enabled, true);
break;
case 'M': tr_variantDictAddBool (&settings, TR_KEY_port_forwarding_enabled, false);
break;
case 'L': tr_variantDictAddInt (&settings, TR_KEY_peer_limit_global, atoi (optarg));
break;
case 'l': tr_variantDictAddInt (&settings, TR_KEY_peer_limit_per_torrent, atoi (optarg));
break;
case 800: paused = true;
break;
case 910: tr_variantDictAddInt (&settings, TR_KEY_encryption, TR_ENCRYPTION_REQUIRED);
break;
case 911: tr_variantDictAddInt (&settings, TR_KEY_encryption, TR_ENCRYPTION_PREFERRED);
break;
case 912: tr_variantDictAddInt (&settings, TR_KEY_encryption, TR_CLEAR_PREFERRED);
break;
case 'i': tr_variantDictAddStr (&settings, TR_KEY_bind_address_ipv4, optarg);
break;
case 'I': tr_variantDictAddStr (&settings, TR_KEY_bind_address_ipv6, optarg);
break;
case 'r': tr_variantDictAddStr (&settings, TR_KEY_rpc_bind_address, optarg);
break;
case 953: tr_variantDictAddReal (&settings, TR_KEY_ratio_limit, atof (optarg));
tr_variantDictAddBool (&settings, TR_KEY_ratio_limit_enabled, true);
break;
case 954: tr_variantDictAddBool (&settings, TR_KEY_ratio_limit_enabled, false);
break;
case 'x': tr_variantDictAddStr (&settings, key_pidfile, optarg);
break;
case 'y': tr_variantDictAddBool (&settings, TR_KEY_lpd_enabled, true);
break;
case 'Y': tr_variantDictAddBool (&settings, TR_KEY_lpd_enabled, false);
break;
case 810: tr_variantDictAddInt (&settings, TR_KEY_message_level, TR_LOG_ERROR);
break;
case 811: tr_variantDictAddInt (&settings, TR_KEY_message_level, TR_LOG_INFO);
break;
case 812: tr_variantDictAddInt (&settings, TR_KEY_message_level, TR_LOG_DEBUG);
break;
case 830: tr_variantDictAddBool (&settings, TR_KEY_utp_enabled, true);
break;
case 831: tr_variantDictAddBool (&settings, TR_KEY_utp_enabled, false);
break;
default: showUsage ();
break;
}
}
if (foreground && !logfile)
logfile = stderr;
if (!loaded)
{
printMessage (logfile, TR_LOG_ERROR, MY_NAME, "Error loading config file -- exiting.", __FILE__, __LINE__);
return -1;
}
if (dumpSettings)
{
char * str = tr_variantToStr (&settings, TR_VARIANT_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_LOG_ERROR, MY_NAME, buf, __FILE__, __LINE__);
exit (1);
}
sd_notifyf (0, "MAINPID=%d\n", (int)getpid());
/* setup event state */
ev_base = event_base_new();
if (ev_base == NULL)
{
char buf[256];
tr_snprintf(buf, sizeof(buf), "Failed to init daemon event state: %s", tr_strerror(errno));
printMessage (logfile, TR_LOG_ERROR, MY_NAME, buf, __FILE__, __LINE__);
exit (1);
}
/* start the session */
tr_formatter_mem_init (MEM_K, MEM_K_STR, MEM_M_STR, MEM_G_STR, MEM_T_STR);
tr_formatter_size_init (DISK_K, DISK_K_STR, DISK_M_STR, DISK_G_STR, DISK_T_STR);
tr_formatter_speed_init (SPEED_K, SPEED_K_STR, SPEED_M_STR, SPEED_G_STR, SPEED_T_STR);
session = tr_sessionInit ("daemon", configDir, true, &settings);
tr_sessionSetRPCCallback (session, on_rpc_callback, NULL);
tr_logAddNamedInfo (NULL, "Using settings from \"%s\"", configDir);
tr_sessionSaveSettings (session, configDir, &settings);
pid_filename = NULL;
tr_variantDictFindStr (&settings, key_pidfile, &pid_filename, NULL);
if (pid_filename && *pid_filename)
{
FILE * fp = fopen (pid_filename, "w+");
if (fp != NULL)
{
fprintf (fp, "%d", (int)getpid ());
fclose (fp);
tr_logAddInfo ("Saved pidfile \"%s\"", pid_filename);
pidfile_created = true;
}
else
tr_logAddError ("Unable to save pidfile \"%s\": %s", pid_filename, tr_strerror (errno));
}
if (tr_variantDictFindBool (&settings, TR_KEY_rpc_authentication_required, &boolVal) && boolVal)
tr_logAddNamedInfo (MY_NAME, "requiring authentication");
mySession = session;
/* If we got a SIGHUP during startup, process that now. */
if (seenHUP)
gotsig (SIGHUP);
/* maybe add a watchdir */
{
const char * dir;
if (tr_variantDictFindBool (&settings, TR_KEY_watch_dir_enabled, &boolVal)
&& boolVal
&& tr_variantDictFindStr (&settings, TR_KEY_watch_dir, &dir, NULL)
&& dir
&& *dir)
{
tr_logAddInfo ("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
/* Create new timer event to report daemon status */
{
struct timeval one_sec = { 1, 0 };
status_ev = event_new(ev_base, -1, EV_PERSIST, &periodicUpdate, watchdir);
if (status_ev == NULL)
{
tr_logAddError("Failed to create status event %s", tr_strerror(errno));
goto cleanup;
}
if (event_add(status_ev, &one_sec) == -1)
{
tr_logAddError("Failed to add status event %s", tr_strerror(errno));
goto cleanup;
}
}
sd_notify( 0, "READY=1\n" );
/* Run daemon event loop */
if (event_base_dispatch(ev_base) == -1)
{
tr_logAddError("Failed to launch daemon event loop: %s", tr_strerror(errno));
goto cleanup;
}
cleanup:
sd_notify( 0, "STATUS=Closing transmission session...\n" );
printf ("Closing transmission session...");
if (status_ev)
{
event_del(status_ev);
event_free(status_ev);
}
event_base_free(ev_base);
tr_sessionSaveSettings (mySession, configDir, &settings);
dtr_watchdir_free (watchdir);
tr_sessionClose (mySession);
pumpLogMessages (logfile);
printf (" done.\n");
/* shutdown */
#if HAVE_SYSLOG
if (!foreground)
{
syslog (LOG_INFO, "%s", "Closing session");
closelog ();
}
#endif
/* cleanup */
if (pidfile_created)
tr_remove (pid_filename);
tr_variantFree (&settings);
sd_notify (0, "STATUS=\n");
return 0;
}
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