trackerclient.cpp Example File
network/torrent/trackerclient.cpp
/****************************************************************************
**
** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
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**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
#include "bencodeparser.h"
#include "connectionmanager.h"
#include "torrentclient.h"
#include "torrentserver.h"
#include "trackerclient.h"
#include <QtCore>
quint32 qntoh(quint32 source)
{
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
return source;
#else
return 0
| ((source & 0x000000ff) << 24)
| ((source & 0x0000ff00) << 8)
| ((source & 0x00ff0000) >> 8)
| ((source & 0xff000000) >> 24);
#endif
}
TrackerClient::TrackerClient(TorrentClient *downloader, QObject *parent)
: QObject(parent), torrentDownloader(downloader)
{
length = 0;
uploadedBytes = 0;
downloadedBytes = 0;
requestInterval = 5 * 60;
requestIntervalTimer = -1;
firstTrackerRequest = true;
lastTrackerRequest = false;
connect(&http, SIGNAL(done(bool)), this, SLOT(httpRequestDone(bool)));
}
void TrackerClient::start(const MetaInfo &info)
{
metaInfo = info;
QTimer::singleShot(0, this, SLOT(fetchPeerList()));
if (metaInfo.fileForm() == MetaInfo::SingleFileForm) {
length = metaInfo.singleFile().length;
} else {
QList<MetaInfoMultiFile> files = metaInfo.multiFiles();
for (int i = 0; i < files.size(); ++i)
length += files.at(i).length;
}
}
void TrackerClient::stop()
{
lastTrackerRequest = true;
http.abort();
fetchPeerList();
}
void TrackerClient::timerEvent(QTimerEvent *event)
{
if (event->timerId() == requestIntervalTimer) {
if (http.state() == QHttp::Unconnected)
fetchPeerList();
} else {
QObject::timerEvent(event);
}
}
void TrackerClient::fetchPeerList()
{
// Prepare connection details
QUrl url(metaInfo.announceUrl());
QByteArray infoHash = torrentDownloader->infoHash();
unsigned int *messageDigest = (unsigned int *)infoHash.constData();
// Percent encode the hash
QByteArray encodedSum;
const char hex[] = "0123456789ABCDEF";
unsigned char chars[4];
for (int i = 0; i < 5; ++i) {
unsigned int digest = qntoh(messageDigest[i]);
chars[0] = (digest & 0xff000000) >> 24;
chars[1] = (digest & 0x00ff0000) >> 16;
chars[2] = (digest & 0x0000ff00) >> 8;
chars[3] = (digest & 0x000000ff);
for (int j = 0; j < 4; ++j) {
unsigned char c = chars[j];
if ((c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z'))
encodedSum += c;
else switch (c) {
case '$': case '-': case '_': case '.':
case '+': case '!': case '*': case '\'':
case '(': case ')':
encodedSum += c;
break;
default: {
encodedSum += "%";
encodedSum += hex[(c & 0xf0) >> 4];
encodedSum += hex[c & 0xf];
break;
}
}
}
}
bool seeding = (torrentDownloader->state() == TorrentClient::Seeding);
QByteArray query;
query += url.path().toLatin1();
query += "?";
query += "info_hash=" + encodedSum;
query += "&peer_id=" + ConnectionManager::instance()->clientId();
query += "&port=" + QByteArray::number(TorrentServer::instance()->serverPort());
query += "&uploaded=" + QByteArray::number(uploadedBytes);
query += "&downloaded=" + QByteArray::number(downloadedBytes);
query += "&left="+ QByteArray::number(seeding ? 0 : qMax<int>(0, length - downloadedBytes));
query += "&compact=1";
if (seeding) {
query += "&event=completed";
} else if (firstTrackerRequest) {
firstTrackerRequest = false;
query += "&event=started";
} else if (lastTrackerRequest) {
query += "&event=stopped";
}
if (!trackerId.isEmpty())
query += "&trackerid=" + trackerId;
http.setHost(url.host(), url.port() == -1 ? 80 : url.port());
if (!url.userName().isEmpty())
http.setUser(url.userName(), url.password());
http.get(query);
}
void TrackerClient::httpRequestDone(bool error)
{
if (lastTrackerRequest) {
emit stopped();
return;
}
if (error) {
emit connectionError(http.error());
return;
}
QByteArray response = http.readAll();
http.abort();
BencodeParser parser;
if (!parser.parse(response)) {
qWarning("Error parsing bencode response from tracker: %s",
qPrintable(parser.errorString()));
http.abort();
return;
}
QMap<QByteArray, QVariant> dict = parser.dictionary();
if (dict.contains("failure reason")) {
// no other items are present
emit failure(QString::fromUtf8(dict.value("failure reason").toByteArray()));
return;
}
if (dict.contains("warning message")) {
// continue processing
emit warning(QString::fromUtf8(dict.value("warning message").toByteArray()));
}
if (dict.contains("tracker id")) {
// store it
trackerId = dict.value("tracker id").toByteArray();
}
if (dict.contains("interval")) {
// Mandatory item
if (requestIntervalTimer != -1)
killTimer(requestIntervalTimer);
requestIntervalTimer = startTimer(dict.value("interval").toInt() * 1000);
}
if (dict.contains("peers")) {
// store it
peers.clear();
QVariant peerEntry = dict.value("peers");
if (peerEntry.type() == QVariant::List) {
QList<QVariant> peerTmp = peerEntry.toList();
for (int i = 0; i < peerTmp.size(); ++i) {
TorrentPeer tmp;
QMap<QByteArray, QVariant> peer = qVariantValue<QMap<QByteArray, QVariant> >(peerTmp.at(i));
tmp.id = QString::fromUtf8(peer.value("peer id").toByteArray());
tmp.address.setAddress(QString::fromUtf8(peer.value("ip").toByteArray()));
tmp.port = peer.value("port").toInt();
peers << tmp;
}
} else {
QByteArray peerTmp = peerEntry.toByteArray();
for (int i = 0; i < peerTmp.size(); i += 6) {
TorrentPeer tmp;
uchar *data = (uchar *)peerTmp.constData() + i;
tmp.port = (int(data[4]) << 8) + data[5];
uint ipAddress = 0;
ipAddress += uint(data[0]) << 24;
ipAddress += uint(data[1]) << 16;
ipAddress += uint(data[2]) << 8;
ipAddress += uint(data[3]);
tmp.address.setAddress(ipAddress);
peers << tmp;
}
}
emit peerListUpdated(peers);
}
}
