transmission/libtransmission/port-forwarding.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.
*
* $Id$
*/
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#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <event2/event.h>
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#include "transmission.h"
#include "natpmp_local.h"
#include "log.h"
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#include "net.h"
#include "peer-mgr.h"
#include "port-forwarding.h"
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#include "session.h"
#include "torrent.h"
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#include "upnp.h"
#include "utils.h"
static const char *
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getKey (void) { return _("Port Forwarding"); }
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struct tr_shared
{
bool isEnabled;
bool isShuttingDown;
bool doPortCheck;
tr_port_forwarding natpmpStatus;
tr_port_forwarding upnpStatus;
tr_upnp * upnp;
tr_natpmp * natpmp;
tr_session * session;
struct event * timer;
};
/***
****
***/
static const char*
getNatStateStr (int state)
{
switch (state)
{
case TR_PORT_MAPPING: return _("Starting");
case TR_PORT_MAPPED: return _("Forwarded");
case TR_PORT_UNMAPPING: return _("Stopping");
case TR_PORT_UNMAPPED: return _("Not forwarded");
default: return "???";
}
}
static void
natPulse (tr_shared * s, bool do_check)
{
int oldStatus;
int newStatus;
tr_port public_peer_port;
const tr_port private_peer_port = s->session->private_peer_port;
const int is_enabled = s->isEnabled && !s->isShuttingDown;
if (s->natpmp == NULL)
s->natpmp = tr_natpmpInit ();
if (s->upnp == NULL)
s->upnp = tr_upnpInit ();
oldStatus = tr_sharedTraversalStatus (s);
s->natpmpStatus = tr_natpmpPulse (s->natpmp, private_peer_port, is_enabled, &public_peer_port);
if (s->natpmpStatus == TR_PORT_MAPPED)
s->session->public_peer_port = public_peer_port;
s->upnpStatus = tr_upnpPulse (s->upnp, private_peer_port, is_enabled, do_check);
newStatus = tr_sharedTraversalStatus (s);
if (newStatus != oldStatus)
tr_logAddNamedInfo (getKey (), _("State changed from \"%1$s\" to \"%2$s\""),
getNatStateStr (oldStatus),
getNatStateStr (newStatus));
}
static void
set_evtimer_from_status (tr_shared * s)
{
int sec=0, msec=0;
/* when to wake up again */
switch (tr_sharedTraversalStatus (s))
{
case TR_PORT_MAPPED:
/* if we're mapped, everything is fine... check back in 20 minutes
* to renew the port forwarding if it's expired */
s->doPortCheck = true;
sec = 60 * 20;
break;
case TR_PORT_ERROR:
/* some kind of an error. wait 60 seconds and retry */
sec = 60;
break;
default:
/* in progress. pulse frequently. */
msec = 333000;
break;
}
if (s->timer != NULL)
tr_timerAdd (s->timer, sec, msec);
}
static void
onTimer (evutil_socket_t fd UNUSED, short what UNUSED, void * vshared)
{
tr_shared * s = vshared;
assert (s);
assert (s->timer);
/* do something */
natPulse (s, s->doPortCheck);
s->doPortCheck = false;
/* set up the timer for the next pulse */
set_evtimer_from_status (s);
}
/***
****
***/
tr_shared *
tr_sharedInit (tr_session * session)
{
tr_shared * s = tr_new0 (tr_shared, 1);
s->session = session;
s->isEnabled = false;
s->upnpStatus = TR_PORT_UNMAPPED;
s->natpmpStatus = TR_PORT_UNMAPPED;
#if 0
if (isEnabled)
{
s->timer = tr_new0 (struct event, 1);
evtimer_set (s->timer, onTimer, s);
tr_timerAdd (s->timer, 0, 333000);
}
#endif
return s;
}
static void
stop_timer (tr_shared * s)
{
if (s->timer != NULL)
{
event_free (s->timer);
s->timer = NULL;
}
}
static void
stop_forwarding (tr_shared * s)
{
tr_logAddNamedInfo (getKey (), "%s", _("Stopped"));
natPulse (s, false);
tr_natpmpClose (s->natpmp);
s->natpmp = NULL;
s->natpmpStatus = TR_PORT_UNMAPPED;
tr_upnpClose (s->upnp);
s->upnp = NULL;
s->upnpStatus = TR_PORT_UNMAPPED;
stop_timer (s);
}
void
tr_sharedClose (tr_session * session)
{
tr_shared * s = session->shared;
s->isShuttingDown = true;
stop_forwarding (s);
s->session->shared = NULL;
tr_free (s);
}
static void
start_timer (tr_shared * s)
{
s->timer = evtimer_new (s->session->event_base, onTimer, s);
set_evtimer_from_status (s);
}
void
tr_sharedTraversalEnable (tr_shared * s, bool isEnabled)
{
if ((s->isEnabled = isEnabled))
start_timer (s);
else
stop_forwarding (s);
}
void
tr_sharedPortChanged (tr_session * session)
{
tr_shared * s = session->shared;
if (s->isEnabled)
{
stop_timer (s);
natPulse (s, false);
start_timer (s);
}
}
bool
tr_sharedTraversalIsEnabled (const tr_shared * s)
{
return s->isEnabled;
}
int
tr_sharedTraversalStatus (const tr_shared * s)
{
return MAX (s->natpmpStatus, s->upnpStatus);
}