1 /*
2 * Bittorrent Client using Qt and libtorrent.
3 * Copyright (C) 2018 Mike Tzou (Chocobo1)
4 * Copyright (C) 2014 Vladimir Golovnev <glassez@yandex.ru>
5 * Copyright (C) 2006 Ishan Arora and Christophe Dumez <chris@qbittorrent.org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 * In addition, as a special exception, the copyright holders give permission to
22 * link this program with the OpenSSL project's "OpenSSL" library (or with
23 * modified versions of it that use the same license as the "OpenSSL" library),
24 * and distribute the linked executables. You must obey the GNU General Public
25 * License in all respects for all of the code used other than "OpenSSL". If you
26 * modify file(s), you may extend this exception to your version of the file(s),
27 * but you are not obligated to do so. If you do not wish to do so, delete this
28 * exception statement from your version.
29 */
30
31 #include "connection.h"
32
33 #include <QTcpSocket>
34
35 #include "base/logger.h"
36 #include "irequesthandler.h"
37 #include "requestparser.h"
38 #include "responsegenerator.h"
39
40 using namespace Http;
41
Connection(QTcpSocket * socket,IRequestHandler * requestHandler,QObject * parent)42 Connection::Connection(QTcpSocket *socket, IRequestHandler *requestHandler, QObject *parent)
43 : QObject(parent)
44 , m_socket(socket)
45 , m_requestHandler(requestHandler)
46 {
47 m_socket->setParent(this);
48 m_idleTimer.start();
49 connect(m_socket, &QTcpSocket::readyRead, this, &Connection::read);
50 }
51
~Connection()52 Connection::~Connection()
53 {
54 m_socket->close();
55 }
56
read()57 void Connection::read()
58 {
59 m_idleTimer.restart();
60 m_receivedData.append(m_socket->readAll());
61
62 while (!m_receivedData.isEmpty())
63 {
64 const RequestParser::ParseResult result = RequestParser::parse(m_receivedData);
65
66 switch (result.status)
67 {
68 case RequestParser::ParseStatus::Incomplete:
69 {
70 const long bufferLimit = RequestParser::MAX_CONTENT_SIZE * 1.1; // some margin for headers
71 if (m_receivedData.size() > bufferLimit)
72 {
73 Logger::instance()->addMessage(tr("Http request size exceeds limitation, closing socket. Limit: %1, IP: %2")
74 .arg(bufferLimit).arg(m_socket->peerAddress().toString()), Log::WARNING);
75
76 Response resp(413, "Payload Too Large");
77 resp.headers[HEADER_CONNECTION] = "close";
78
79 sendResponse(resp);
80 m_socket->close();
81 }
82 }
83 return;
84
85 case RequestParser::ParseStatus::BadRequest:
86 {
87 Logger::instance()->addMessage(tr("Bad Http request, closing socket. IP: %1")
88 .arg(m_socket->peerAddress().toString()), Log::WARNING);
89
90 Response resp(400, "Bad Request");
91 resp.headers[HEADER_CONNECTION] = "close";
92
93 sendResponse(resp);
94 m_socket->close();
95 }
96 return;
97
98 case RequestParser::ParseStatus::OK:
99 {
100 const Environment env {m_socket->localAddress(), m_socket->localPort(), m_socket->peerAddress(), m_socket->peerPort()};
101
102 Response resp = m_requestHandler->processRequest(result.request, env);
103
104 if (acceptsGzipEncoding(result.request.headers["accept-encoding"]))
105 resp.headers[HEADER_CONTENT_ENCODING] = "gzip";
106
107 resp.headers[HEADER_CONNECTION] = "keep-alive";
108
109 sendResponse(resp);
110 m_receivedData = m_receivedData.mid(result.frameSize);
111 }
112 break;
113
114 default:
115 Q_ASSERT(false);
116 return;
117 }
118 }
119 }
120
sendResponse(const Response & response) const121 void Connection::sendResponse(const Response &response) const
122 {
123 m_socket->write(toByteArray(response));
124 }
125
hasExpired(const qint64 timeout) const126 bool Connection::hasExpired(const qint64 timeout) const
127 {
128 return m_idleTimer.hasExpired(timeout);
129 }
130
isClosed() const131 bool Connection::isClosed() const
132 {
133 return (m_socket->state() == QAbstractSocket::UnconnectedState);
134 }
135
acceptsGzipEncoding(QString codings)136 bool Connection::acceptsGzipEncoding(QString codings)
137 {
138 // [rfc7231] 5.3.4. Accept-Encoding
139
140 const auto isCodingAvailable = [](const QVector<QStringRef> &list, const QString &encoding) -> bool
141 {
142 for (const QStringRef &str : list)
143 {
144 if (!str.startsWith(encoding))
145 continue;
146
147 // without quality values
148 if (str == encoding)
149 return true;
150
151 // [rfc7231] 5.3.1. Quality Values
152 const QStringRef substr = str.mid(encoding.size() + 3); // ex. skip over "gzip;q="
153
154 bool ok = false;
155 const double qvalue = substr.toDouble(&ok);
156 if (!ok || (qvalue <= 0))
157 return false;
158
159 return true;
160 }
161 return false;
162 };
163
164 const QVector<QStringRef> list = codings.remove(' ').remove('\t').splitRef(',', QString::SkipEmptyParts);
165 if (list.isEmpty())
166 return false;
167
168 const bool canGzip = isCodingAvailable(list, QLatin1String("gzip"));
169 if (canGzip)
170 return true;
171
172 const bool canAny = isCodingAvailable(list, QLatin1String("*"));
173 if (canAny)
174 return true;
175
176 return false;
177 }
178