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) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSerialBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMODBUSTCPSERVER_P_H
#define QMODBUSTCPSERVER_P_H
#include <QtCore/qdatastream.h>
#include <QtCore/qdebug.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qobject.h>
#include <QtNetwork/qhostaddress.h>
#include <QtNetwork/qtcpserver.h>
#include <QtNetwork/qtcpsocket.h>
#include <QtSerialBus/qmodbustcpserver.h>
#include <private/qmodbusserver_p.h>
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(QT_MODBUS)
Q_DECLARE_LOGGING_CATEGORY(QT_MODBUS_LOW)
class QModbusTcpServerPrivate : public QModbusServerPrivate
{
Q_DECLARE_PUBLIC(QModbusTcpServer)
public:
/*
This function is a workaround since 2nd level lambda below cannot
call protected QModbusTcpServer::processRequest(..) function on VS2013.
*/
QModbusResponse forwardProcessRequest(const QModbusRequest &r)
{
Q_Q(QModbusTcpServer);
if (q->value(QModbusServer::DeviceBusy).value<quint16>() == 0xffff) {
// If the device is busy, send an exception response without processing.
incrementCounter(QModbusServerPrivate::Counter::ServerBusy);
return QModbusExceptionResponse(r.functionCode(),
QModbusExceptionResponse::ServerDeviceBusy);
}
return q->processRequest(r);
}
/*
This function is a workaround since 2nd level lambda below cannot
call protected QModbusDevice::setError(..) function on VS2013.
*/
void forwardError(const QString &errorText, QModbusDevice::Error error)
{
Q_Q(QModbusTcpServer);
q->setError(errorText, error);
}
/*
This function is a workaround since 2nd level lambda below
cannot call QModbusServer::serverAddress(..) function on VS2013.
*/
bool matchingServerAddress(quint8 unitId) const
{
Q_Q(const QModbusTcpServer);
if (q->serverAddress() == unitId)
return true;
// No, not our address! Ignore!
qCDebug(QT_MODBUS) << "(TCP server) Wrong server unit identifier address, expected"
<< q->serverAddress() << "got" << unitId;
return false;
}
void setupTcpServer()
{
Q_Q(QModbusTcpServer);
m_tcpServer = new QTcpServer(q);
QObject::connect(m_tcpServer, &QTcpServer::newConnection, [this]() {
auto *socket = m_tcpServer->nextPendingConnection();
if (!socket)
return;
qCDebug(QT_MODBUS) << "(TCP server) Incoming socket from" << socket->peerAddress()
<< socket->peerName() << socket->peerPort();
connections.append(socket);
auto buffer = new QByteArray();
QObject::connect(socket, &QObject::destroyed, [buffer]() {
// cleanup buffer
delete buffer;
});
QObject::connect(socket, &QTcpSocket::disconnected, [socket, this]() {
connections.removeAll(socket);
socket->deleteLater();
});
QObject::connect(socket, &QTcpSocket::readyRead, [buffer, socket, this]() {
if (!socket)
return;
buffer->append(socket->readAll());
while (!buffer->isEmpty()) {
qCDebug(QT_MODBUS_LOW).noquote() << "(TCP server) Read buffer: 0x"
+ buffer->toHex();
if (buffer->size() < mbpaHeaderSize) {
qCDebug(QT_MODBUS) << "(TCP server) ADU too short. Waiting for more data.";
return;
}
quint8 unitId;
quint16 transactionId, bytesPdu, protocolId;
QDataStream input(*buffer);
input >> transactionId >> protocolId >> bytesPdu >> unitId;
qCDebug(QT_MODBUS_LOW) << "(TCP server) Request MBPA:" << "Transaction Id:"
<< hex << transactionId << "Protocol Id:" << protocolId << "PDU bytes:"
<< bytesPdu << "Unit Id:" << unitId;
// The length field is the byte count of the following fields, including the Unit
// Identifier and the PDU, so we remove on byte.
bytesPdu--;
if (buffer->size() < mbpaHeaderSize + bytesPdu) {
qCDebug(QT_MODBUS) << "(TCP server) PDU too short. Waiting for more data";
return;
}
QModbusRequest request;
input >> request;
buffer->remove(0, mbpaHeaderSize + bytesPdu);
if (!matchingServerAddress(unitId))
continue;
qCDebug(QT_MODBUS) << "(TCP server) Request PDU:" << request;
const QModbusResponse response = forwardProcessRequest(request);
qCDebug(QT_MODBUS) << "(TCP server) Response PDU:" << response;
QByteArray result;
QDataStream output(&result, QIODevice::WriteOnly);
// The length field is the byte count of the following fields, including the Unit
// Identifier and PDU fields, so we add one byte to the response size.
output << transactionId << protocolId << quint16(response.size() + 1)
<< unitId << response;
if (!socket->isOpen()) {
qCDebug(QT_MODBUS) << "(TCP server) Requesting socket has closed.";
forwardError(QModbusTcpServer::tr("Requesting socket is closed"),
QModbusDevice::WriteError);
return;
}
int writtenBytes = socket->write(result);
if (writtenBytes == -1 || writtenBytes < result.size()) {
qCDebug(QT_MODBUS) << "(TCP server) Cannot write requested response to socket.";
forwardError(QModbusTcpServer::tr("Could not write response to client"),
QModbusDevice::WriteError);
}
}
});
});
QObject::connect(m_tcpServer, &QTcpServer::acceptError,
[this](QAbstractSocket::SocketError /*sError*/) {
Q_Q(QModbusTcpServer);
qCWarning(QT_MODBUS) << "(TCP server) Accept error";
q->setError(m_tcpServer->errorString(), QModbusDevice::ConnectionError);
});
}
QTcpServer *m_tcpServer;
QVector<QTcpSocket *> connections;
static const qint8 mbpaHeaderSize = 7;
static const qint16 maxBytesModbusADU = 260;
};
QT_END_NAMESPACE
#endif // QMODBUSTCPSERVER_P_H
|
