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
|
/*
# Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# -----------------------------------------------------------------------------
# src/net/mcast/McastReceiver.h
# - implement the receiver-side multicast file transfer protocol -- implementation
# -----------------------------------------------------------------------------
*/
#include <QDataStream>
#include <QtDebug>
#include <QtGlobal>
#include <pgm/pgm.h>
// OpenPGM #defines bool. This is bad in C++.
#undef bool
#include "McastConstants.h"
#include "McastReceiver.h"
McastReceiver::McastReceiver(QIODevice* iodev, McastConfiguration* config, QObject* parent) :
QObject(parent),
_config(config ? new McastConfiguration(*config) : 0),
_socket(0),
_curoffs(0),
_closed(false),
_hash(QCryptographicHash::Md5),
_iodev(iodev)
{
_config->setParent(this);
}
McastReceiver::~McastReceiver()
{
if (_config)
delete _config;
}
void McastReceiver::config(McastConfiguration const* config)
{
if (_config)
delete _config;
_config = new McastConfiguration(*config, this);
}
bool McastReceiver::start()
{
McastConfiguration *config = _config;
if (!config)
config = new McastConfiguration();
if (_socket)
{
delete _socket;
}
_socket = new McastPGMSocket(this);
connect(_socket, SIGNAL(receivedPacket(QByteArray)), SLOT(receivedPacket(QByteArray)));
connect(_socket, SIGNAL(connectionReset()), SLOT(connectionReset()));
// connect(_socket, SIGNAL(connectionFinished()), this, SLOT(connectionFinished()));
if (_socket->open(_config, McastPGMSocket::PSOCK_READ))
{
return true;
}
else
{
disconnect(_socket, SIGNAL(receivedPacket(QByteArray)), this, SLOT(receivedPacket(QByteArray)));
disconnect(_socket, SIGNAL(connectionReset()), this, SLOT(connectionReset()));
return false;
}
}
void McastReceiver::abort()
{
if (_socket)
{
delete _socket;
_socket = 0;
}
if (_iodev)
{
_iodev->close();
}
}
void McastReceiver::receivedPacket(QByteArray const& bytes)
{
if(_closed)
return;
quint16 checksum_should = qChecksum(bytes.constData(), bytes.size() - 2);
QDataStream strm(bytes);
strm.setByteOrder(QDataStream::BigEndian);
// read the packet
quint64 magic;
quint64 offset;
quint16 checksum;
strm >> magic;
if(magic != MCASTFT_MAGIC)
{
qCritical() << "Received packet whose magic number does not match. Ignoring.";
return;
}
strm >> offset;
qDebug() << " Received packet for offset" << offset;
if (offset == UINT64_C(0xffffffffffffffff))
{
// this is the end of the data stream.
QByteArray md5;
strm >> md5;
quint16 fchecksum;
strm >> fchecksum;
// compare the hash value
if ((fchecksum != checksum_should) || (md5 != _hash.result()))
{
_close(RES_MD5_MISMATCH);
}
else
{
_close(RES_OK);
}
return;
}
else if (offset != _curoffs)
{
qCritical() << "Packet loss or double delivery. PGM should have prevented this. Bailing out.";
_close(RES_OFFSET_MISMATCH);
return;
}
QByteArray contents;
strm >> contents;
_curoffs += contents.size();
strm >> checksum;
if(checksum != checksum_should)
{
qCritical() << "Checksum does not match. Bailing out.";
_close(RES_CHECKSUM_MISMATCH);
return;
}
_hash.addData(contents);
_iodev->write(contents);
emit progress(_curoffs);
}
void McastReceiver::connectionReset()
{
_close(RES_CONNECTION_RESET);
}
void McastReceiver::_close(Result result)
{
_iodev->close();
_socket->finish();
_closed = true;
emit finished(result);
}
|
