1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2017 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qnetworkproxy.h"
#ifndef QT_NO_NETWORKPROXY
#include <QtCore/QByteArray>
#include <QtCore/QMutex>
#include <QtCore/QSemaphore>
#include <QtCore/QUrl>
#include <QtCore/private/qeventdispatcher_unix_p.h>
#include <QtCore/private/qthread_p.h>
#include <proxy.h>
#include <dlfcn.h>
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
static bool isThreadingNeeded()
{
// Try to guess if the libproxy we linked to is from the libproxy project
// or if it is from pacrunner. Neither library is thread-safe, but the one
// from libproxy is worse, since it may launch JS engines that don't take
// kindly to being executed from multiple threads (even if at different
// times). The pacrunner implementation doesn't suffer from this because
// the JS execution is out of process, in the pacrunner daemon.
void *sym;
#ifdef Q_CC_GNU
// Search for the mangled name of the virtual table of the pacrunner
// extension. Even if libproxy begins using -fvisibility=hidden, this
// symbol can't be hidden.
sym = dlsym(RTLD_DEFAULT, "_ZTVN8libproxy19pacrunner_extensionE");
#else
// The default libproxy one uses libmodman for its module management and
// leaks symbols because it doesn't use -fvisibility=hidden (as of
// v0.4.15).
sym = dlsym(RTLD_DEFAULT, "mm_info_ignore_hostname");
#endif
return sym != nullptr;
}
class QLibProxyWrapper : public QDaemonThread
{
Q_OBJECT
public:
QLibProxyWrapper();
~QLibProxyWrapper();
QList<QUrl> getProxies(const QUrl &url);
private:
struct Data {
// we leave the conversion to/from QUrl to the calling thread
const char *url;
char **proxies;
QSemaphore replyReady;
};
void run() override;
pxProxyFactory *factory; // not subject to the mutex
QMutex mutex;
QSemaphore requestReady;
Data *request;
};
Q_GLOBAL_STATIC(QLibProxyWrapper, libProxyWrapper);
QLibProxyWrapper::QLibProxyWrapper()
{
if (isThreadingNeeded()) {
setEventDispatcher(new QEventDispatcherUNIX); // don't allow the Glib one
start();
} else {
factory = px_proxy_factory_new();
Q_CHECK_PTR(factory);
}
}
QLibProxyWrapper::~QLibProxyWrapper()
{
if (isRunning()) {
requestInterruption();
requestReady.release();
wait();
} else {
px_proxy_factory_free(factory);
}
}
/*
Gets the list of proxies from libproxy, converted to QUrl list. Apply
thread-safety, though its documentation says otherwise, libproxy isn't
thread-safe.
*/
QList<QUrl> QLibProxyWrapper::getProxies(const QUrl &url)
{
QByteArray encodedUrl = url.toEncoded();
Data data;
data.url = encodedUrl.constData();
{
QMutexLocker locker(&mutex);
if (isRunning()) {
// threaded mode
// it's safe to write to request because we hold the mutex:
// our aux thread is blocked waiting for work and no other thread
// could have got here
request = &data;
requestReady.release();
// wait for the reply
data.replyReady.acquire();
} else {
// non-threaded mode
data.proxies = px_proxy_factory_get_proxies(factory, data.url);
}
}
QList<QUrl> ret;
if (data.proxies) {
for (int i = 0; data.proxies[i]; i++) {
ret.append(QUrl::fromEncoded(data.proxies[i]));
free(data.proxies[i]);
}
free(data.proxies);
}
return ret;
}
void QLibProxyWrapper::run()
{
factory = px_proxy_factory_new();
Q_CHECK_PTR(factory);
forever {
requestReady.acquire();
if (isInterruptionRequested())
break;
request->proxies = px_proxy_factory_get_proxies(factory, request->url);
request->replyReady.release();
}
px_proxy_factory_free(factory);
}
QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkProxyQuery &query)
{
QList<QNetworkProxy> proxyList;
QUrl queryUrl;
QNetworkProxy::Capabilities requiredCapabilities(0);
switch (query.queryType()) {
//URL requests are directly supported by libproxy
case QNetworkProxyQuery::UrlRequest:
queryUrl = query.url();
break;
// fake URLs to get libproxy to tell us the SOCKS proxy
case QNetworkProxyQuery::TcpSocket:
queryUrl.setScheme(QStringLiteral("tcp"));
queryUrl.setHost(query.peerHostName());
queryUrl.setPort(query.peerPort());
requiredCapabilities |= QNetworkProxy::TunnelingCapability;
break;
case QNetworkProxyQuery::UdpSocket:
queryUrl.setScheme(QStringLiteral("udp"));
queryUrl.setHost(query.peerHostName());
queryUrl.setPort(query.peerPort());
requiredCapabilities |= QNetworkProxy::UdpTunnelingCapability;
break;
default:
proxyList.append(QNetworkProxy(QNetworkProxy::NoProxy));
return proxyList;
}
const QList<QUrl> rawProxies = libProxyWrapper()->getProxies(queryUrl);
bool haveDirectConnection = false;
for (const QUrl& url : rawProxies) {
QNetworkProxy::ProxyType type;
const QString scheme = url.scheme();
if (scheme == "http"_L1) {
type = QNetworkProxy::HttpProxy;
} else if (scheme == "socks"_L1 || scheme == "socks5"_L1) {
type = QNetworkProxy::Socks5Proxy;
} else if (scheme == "ftp"_L1) {
type = QNetworkProxy::FtpCachingProxy;
} else if (scheme == "direct"_L1) {
type = QNetworkProxy::NoProxy;
haveDirectConnection = true;
} else {
continue; //unsupported proxy type e.g. socks4
}
QNetworkProxy proxy(type,
url.host(QUrl::EncodeUnicode),
url.port(0),
url.userName(QUrl::FullyDecoded),
url.password(QUrl::FullyDecoded));
if ((proxy.capabilities() & requiredCapabilities) == requiredCapabilities)
proxyList.append(proxy);
}
// fallback is direct connection
if (proxyList.isEmpty() || !haveDirectConnection)
proxyList.append(QNetworkProxy(QNetworkProxy::NoProxy));
return proxyList;
}
QT_END_NAMESPACE
#include "qnetworkproxy_libproxy.moc"
#endif
|
