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1 | /**************************************************************************** |
2 | ** | |
3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ** All rights reserved. | |
5 | ** | |
6 | ** Contact: Nokia Corporation (qt-info@nokia.com) | |
7 | ** | |
8 | ** This file is part of a Qt Solutions component. | |
9 | ** | |
10 | ** You may use this file under the terms of the BSD license as follows: | |
11 | ** | |
12 | ** "Redistribution and use in source and binary forms, with or without | |
13 | ** modification, are permitted provided that the following conditions are | |
14 | ** met: | |
15 | ** * Redistributions of source code must retain the above copyright | |
16 | ** notice, this list of conditions and the following disclaimer. | |
17 | ** * Redistributions in binary form must reproduce the above copyright | |
18 | ** notice, this list of conditions and the following disclaimer in | |
19 | ** the documentation and/or other materials provided with the | |
20 | ** distribution. | |
21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor | |
22 | ** the names of its contributors may be used to endorse or promote | |
23 | ** products derived from this software without specific prior written | |
24 | ** permission. | |
25 | ** | |
26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." | |
37 | ** | |
38 | ****************************************************************************/ | |
39 | ||
40 | ||
41 | #include "qtlocalpeer.h" | |
42 | #include <QtCore/QCoreApplication> | |
43 | #include <QtCore/QTime> | |
44 | #include <unistd.h> | |
45 | ||
46 | #if defined(Q_OS_WIN) | |
47 | #include <QtCore/QLibrary> | |
48 | #include <QtCore/qt_windows.h> | |
49 | typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*); | |
50 | static PProcessIdToSessionId pProcessIdToSessionId = 0; | |
51 | #endif | |
52 | #if defined(Q_OS_UNIX) | |
53 | #include <time.h> | |
54 | #endif | |
55 | ||
56 | namespace QtLP_Private { | |
57 | #include "qtlockedfile.cpp" | |
58 | #if defined(Q_OS_WIN) | |
59 | #include "qtlockedfile_win.cpp" | |
60 | #else | |
61 | #include "qtlockedfile_unix.cpp" | |
62 | #endif | |
63 | } | |
64 | ||
65 | const char* QtLocalPeer::ack = "ack"; | |
66 | ||
67 | QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId) | |
68 | : QObject(parent), id(appId) | |
69 | { | |
70 | QString prefix = id; | |
71 | if (id.isEmpty()) { | |
72 | id = QCoreApplication::applicationFilePath(); | |
73 | #if defined(Q_OS_WIN) | |
74 | id = id.toLower(); | |
75 | #endif | |
76 | prefix = id.section(QLatin1Char('/'), -1); | |
77 | } | |
78 | prefix.remove(QRegExp("[^a-zA-Z]")); | |
79 | prefix.truncate(6); | |
80 | ||
81 | QByteArray idc = id.toUtf8(); | |
82 | quint16 idNum = qChecksum(idc.constData(), idc.size()); | |
83 | socketName = QLatin1String("qtsingleapp-") + prefix | |
84 | + QLatin1Char('-') + QString::number(idNum, 16); | |
85 | ||
86 | #if defined(Q_OS_WIN) | |
87 | if (!pProcessIdToSessionId) { | |
88 | QLibrary lib("kernel32"); | |
89 | pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId"); | |
90 | } | |
91 | if (pProcessIdToSessionId) { | |
92 | DWORD sessionId = 0; | |
93 | pProcessIdToSessionId(GetCurrentProcessId(), &sessionId); | |
94 | socketName += QLatin1Char('-') + QString::number(sessionId, 16); | |
95 | } | |
96 | #else | |
97 | socketName += QLatin1Char('-') + QString::number(::getuid(), 16); | |
98 | #endif | |
99 | ||
100 | server = new QLocalServer(this); | |
101 | QString lockName = QDir(QDir::tempPath()).absolutePath() | |
102 | + QLatin1Char('/') + socketName | |
103 | + QLatin1String("-lockfile"); | |
104 | lockFile.setFileName(lockName); | |
105 | lockFile.open(QIODevice::ReadWrite); | |
106 | } | |
107 | ||
108 | ||
109 | ||
110 | bool QtLocalPeer::isClient() | |
111 | { | |
112 | if (lockFile.isLocked()) | |
113 | return false; | |
114 | ||
115 | if (!lockFile.lock(QtLP_Private::QtLockedFile::WriteLock, false)) | |
116 | return true; | |
117 | ||
118 | bool res = server->listen(socketName); | |
119 | #if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(4,5,0)) | |
120 | // ### Workaround | |
121 | if (!res && server->serverError() == QAbstractSocket::AddressInUseError) { | |
122 | QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName); | |
123 | res = server->listen(socketName); | |
124 | } | |
125 | #endif | |
126 | if (!res) | |
127 | qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString())); | |
128 | QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection())); | |
129 | return false; | |
130 | } | |
131 | ||
132 | ||
133 | bool QtLocalPeer::sendMessage(const QString &message, int timeout) | |
134 | { | |
135 | if (!isClient()) | |
136 | return false; | |
137 | ||
138 | QLocalSocket socket; | |
139 | bool connOk = false; | |
140 | for(int i = 0; i < 2; i++) { | |
141 | // Try twice, in case the other instance is just starting up | |
142 | socket.connectToServer(socketName); | |
143 | connOk = socket.waitForConnected(timeout/2); | |
144 | if (connOk || i) | |
145 | break; | |
146 | int ms = 250; | |
147 | #if defined(Q_OS_WIN) | |
148 | Sleep(DWORD(ms)); | |
149 | #else | |
150 | struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 }; | |
151 | nanosleep(&ts, NULL); | |
152 | #endif | |
153 | } | |
154 | if (!connOk) | |
155 | return false; | |
156 | ||
157 | QByteArray uMsg(message.toUtf8()); | |
158 | QDataStream ds(&socket); | |
159 | ds.writeBytes(uMsg.constData(), uMsg.size()); | |
160 | bool res = socket.waitForBytesWritten(timeout); | |
161 | if (res) { | |
162 | res &= socket.waitForReadyRead(timeout); // wait for ack | |
163 | if (res) | |
164 | res &= (socket.read(qstrlen(ack)) == ack); | |
165 | } | |
166 | return res; | |
167 | } | |
168 | ||
169 | ||
170 | void QtLocalPeer::receiveConnection() | |
171 | { | |
172 | QLocalSocket* socket = server->nextPendingConnection(); | |
173 | if (!socket) | |
174 | return; | |
175 | ||
176 | while (socket->bytesAvailable() < (int)sizeof(quint32)) | |
177 | socket->waitForReadyRead(); | |
178 | QDataStream ds(socket); | |
179 | QByteArray uMsg; | |
180 | quint32 remaining; | |
181 | ds >> remaining; | |
182 | uMsg.resize(remaining); | |
183 | int got = 0; | |
184 | char* uMsgBuf = uMsg.data(); | |
185 | do { | |
186 | got = ds.readRawData(uMsgBuf, remaining); | |
187 | remaining -= got; | |
188 | uMsgBuf += got; | |
189 | } while (remaining && got >= 0 && socket->waitForReadyRead(2000)); | |
190 | if (got < 0) { | |
191 | qWarning("QtLocalPeer: Message reception failed %s", socket->errorString().toLatin1().constData()); | |
192 | delete socket; | |
193 | return; | |
194 | } | |
195 | QString message(QString::fromUtf8(uMsg)); | |
196 | socket->write(ack, qstrlen(ack)); | |
197 | socket->waitForBytesWritten(1000); | |
198 | delete socket; | |
199 | emit messageReceived(message); //### (might take a long time to return) | |
200 | } |