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/*
* lftp - file transfer program
*
* Copyright (c) 1996-2014 by Alexander V. Lukyanov (lav@yars.free.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TORRENTTRACKER_H
#define TORRENTTRACKER_H
#include "url.h"
class TrackerBackend;
class TorrentTracker : public SMTask, protected ProtoLog
{
friend class Torrent;
friend class TrackerBackend;
Torrent *parent;
xarray_p<xstring> tracker_urls;
int current_tracker;
SMTaskRef<TrackerBackend> backend;
Timer tracker_timer;
Timer tracker_timeout_timer;
xstring tracker_id;
bool started;
Ref<Error> error;
int tracker_no;
TorrentTracker(Torrent *p,const char *url);
void AddURL(const char *url);
int Do();
void Start();
void Shutdown();
void SendTrackerRequest(const char *event);
void SetError(const char *e);
bool Failed() const { return error!=0 || tracker_urls.count()==0; }
const char *ErrorText() const { return error->Text(); }
void NextTracker();
void CreateTrackerBackend();
const char *GetLogContext() { return GetURL(); }
public:
~TorrentTracker() {}
const char *NextRequestIn() const {
return tracker_timer.TimeLeft().toString(
TimeInterval::TO_STR_TRANSLATE|TimeInterval::TO_STR_TERSE);
}
const char *GetURL() const {
return tracker_urls[current_tracker]->get();
}
const char *Status() const;
bool IsActive() const;
void TrackerRequestFinished() { tracker_timer.Reset(); }
void SetInterval(unsigned i) {
if(i<30)
i=30;
tracker_timer.Set(i);
LogNote(4,"Tracker interval is %u",i);
}
void SetTrackerID(const xstring& id) {
if(id)
tracker_id.set(id);
}
bool AddPeerCompact(const char *a,int len) const;
bool AddPeer(const xstring& addr,int port) const;
bool ShuttingDown();
};
class TrackerBackend : public SMTask, protected ProtoLog
{
protected:
TorrentTracker *master;
void SetError(const char *e) { master->SetError(e); }
const char *GetURL() const { return master->GetURL(); }
const xstring& GetInfoHash() const;
const xstring& GetMyPeerId() const;
int GetPort() const;
unsigned long long GetTotalSent() const;
unsigned long long GetTotalRecv() const;
unsigned long long GetTotalLeft() const;
bool HasMetadata() const;
bool Complete() const;
int GetWantedPeersCount() const;
const xstring& GetMyKey() const;
unsigned GetMyKeyNum() const;
const char *GetTrackerId() const;
void SetTrackerID(const xstring& id) const { master->SetTrackerID(id); }
void SetInterval(unsigned i) const { master->SetInterval(i); }
bool AddPeerCompact(const char *a,int len) const { return master->AddPeerCompact(a,len); }
bool AddPeer(const xstring& addr,int port) const { return master->AddPeer(addr,port); }
void NextTracker() const { master->NextTracker(); }
bool ShuttingDown() const;
void Started() const;
void TrackerRequestFinished() const;
const char *GetLogContext() { return master->GetLogContext(); }
public:
TrackerBackend(TorrentTracker *m) : master(m) {}
virtual ~TrackerBackend() {}
virtual bool IsActive() const = 0;
virtual void SendTrackerRequest(const char *event) = 0;
virtual const char *Status() const = 0;
};
class HttpTracker : public TrackerBackend
{
FileAccessRef t_session;
SMTaskRef<IOBuffer> tracker_reply;
int HandleTrackerReply();
public:
bool IsActive() const { return tracker_reply!=0; }
void SendTrackerRequest(const char *event);
HttpTracker(TorrentTracker *m,ParsedURL *u)
: TrackerBackend(m), t_session(FileAccess::New(u)) {}
~HttpTracker() {}
int Do();
const char *Status() const { return t_session->CurrentStatus(); }
};
class UdpTracker : public TrackerBackend, protected Networker
{
xstring_c hostname;
xstring_c portname;
SMTaskRef<Resolver> resolver;
xarray<sockaddr_u> peer;
int peer_curr;
void NextPeer();
int sock; // udp socket for packet exchange
Timer timeout_timer;
int try_number; // timeout = 60 * 2^try_number
bool has_connection_id;
unsigned long long connection_id;
enum action_t {
a_none=-1,
a_connect=0,
a_announce=1,
a_scrape=2,
a_error=3,
a_announce6=4,
};
enum event_t {
ev_idle=-1,
ev_none=0,
ev_completed=1,
ev_started=2,
ev_stopped=3,
};
enum magic_t {
connect_magic=0x41727101980ULL,
};
static const char *EventToString(event_t e);
unsigned transaction_id;
action_t current_action;
event_t current_event;
bool SendPacket(Buffer& req);
bool SendConnectRequest();
bool SendEventRequest();
bool RecvReply();
unsigned NewTransactionId() { return transaction_id=random(); }
public:
UdpTracker(TorrentTracker *m,ParsedURL *u)
: TrackerBackend(m),
hostname(u->host.get()), portname(u->port.get()),
peer_curr(0), sock(-1), timeout_timer(60), try_number(0),
has_connection_id(false), connection_id(0),
current_action(a_none), current_event(ev_idle) {}
~UdpTracker() {
if(sock!=-1)
close(sock);
}
int Do();
bool IsActive() const { return current_event!=ev_idle; }
void SendTrackerRequest(const char *event);
const char *Status() const;
};
#endif // TORRENTTRACKER_H
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