summaryrefslogtreecommitdiffstats
path: root/src/network/socket/qsocks5socketengine.cpp
blob: 88b5aca43418267b23288765612d267a50da2839 (plain)
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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsocks5socketengine_p.h"

#ifndef QT_NO_SOCKS5

#include "qtcpsocket.h"
#include "qudpsocket.h"
#include "qtcpserver.h"
#include "qdebug.h"
#include "qhash.h"
#include "qqueue.h"
#include "qelapsedtimer.h"
#include "qmutex.h"
#include "qthread.h"
#include "qcoreapplication.h"
#include "qurl.h"
#include "qauthenticator.h"
#include <qendian.h>
#include <qnetworkinterface.h>

QT_BEGIN_NAMESPACE

#ifdef Q_OS_SYMBIAN
static const int MaxWriteBufferSize = 4*1024;
#else
static const int MaxWriteBufferSize = 128*1024;
#endif

//#define QSOCKS5SOCKETLAYER_DEBUG

#define MAX_DATA_DUMP 256
#if !defined(Q_OS_WINCE)
#define SOCKS5_BLOCKING_BIND_TIMEOUT 5000
#else
#define SOCKS5_BLOCKING_BIND_TIMEOUT 10000
#endif

#define Q_INIT_CHECK(returnValue) do { \
    if (!d->data) { \
        return returnValue; \
    } } while (0)

#define S5_VERSION_5 0x05
#define S5_CONNECT 0x01
#define S5_BIND 0x02
#define S5_UDP_ASSOCIATE 0x03
#define S5_IP_V4 0x01
#define S5_DOMAINNAME 0x03
#define S5_IP_V6 0x04
#define S5_SUCCESS 0x00
#define S5_R_ERROR_SOCKS_FAILURE 0x01
#define S5_R_ERROR_CON_NOT_ALLOWED 0x02
#define S5_R_ERROR_NET_UNREACH 0x03
#define S5_R_ERROR_HOST_UNREACH 0x04
#define S5_R_ERROR_CONN_REFUSED 0x05
#define S5_R_ERROR_TTL 0x06
#define S5_R_ERROR_CMD_NOT_SUPPORTED 0x07
#define S5_R_ERROR_ADD_TYPE_NOT_SUPORTED 0x08

#define S5_AUTHMETHOD_NONE 0x00
#define S5_AUTHMETHOD_PASSWORD 0x02
#define S5_AUTHMETHOD_NOTACCEPTABLE 0xFF

#define S5_PASSWORDAUTH_VERSION 0x01

#ifdef QSOCKS5SOCKETLAYER_DEBUG
#  define QSOCKS5_Q_DEBUG qDebug() << this
#  define QSOCKS5_D_DEBUG qDebug() << q_ptr
#  define QSOCKS5_DEBUG qDebug() << "[QSocks5]"
static QString s5StateToString(QSocks5SocketEnginePrivate::Socks5State s)
{
    switch (s) {
    case QSocks5SocketEnginePrivate::Uninitialized: return QLatin1String("Uninitialized");
    case QSocks5SocketEnginePrivate::ConnectError: return QLatin1String("ConnectError");
    case QSocks5SocketEnginePrivate::AuthenticationMethodsSent: return QLatin1String("AuthenticationMethodsSent");
    case QSocks5SocketEnginePrivate::Authenticating: return QLatin1String("Authenticating");
    case QSocks5SocketEnginePrivate::AuthenticatingError: return QLatin1String("AuthenticatingError");
    case QSocks5SocketEnginePrivate::RequestMethodSent: return QLatin1String("RequestMethodSent");
    case QSocks5SocketEnginePrivate::RequestError: return QLatin1String("RequestError");
    case QSocks5SocketEnginePrivate::Connected: return QLatin1String("Connected");
    case QSocks5SocketEnginePrivate::UdpAssociateSuccess: return QLatin1String("UdpAssociateSuccess");
    case QSocks5SocketEnginePrivate::BindSuccess: return QLatin1String("BindSuccess");
    case QSocks5SocketEnginePrivate::ControlSocketError: return QLatin1String("ControlSocketError");
    case QSocks5SocketEnginePrivate::SocksError: return QLatin1String("SocksError");
    case QSocks5SocketEnginePrivate::HostNameLookupError: return QLatin1String("HostNameLookupError");
    default: break;
    }
    return QLatin1String("unknown state");
}

static QString dump(const QByteArray &buf)
{
    QString data;
    for (int i = 0; i < qMin<int>(MAX_DATA_DUMP, buf.size()); ++i) {
        if (i) data += QLatin1Char(' ');
        uint val = (unsigned char)buf.at(i);
       // data += QString("0x%1").arg(val, 3, 16, QLatin1Char('0'));
        data += QString::number(val);
    }
    if (buf.size() > MAX_DATA_DUMP)
        data += QLatin1String(" ...");

    return QString::fromLatin1("size: %1 data: { %2 }").arg(buf.size()).arg(data);
}

#else
#  define QSOCKS5_DEBUG if (0) qDebug()
#  define QSOCKS5_Q_DEBUG if (0) qDebug()
#  define QSOCKS5_D_DEBUG if (0) qDebug()

static inline QString s5StateToString(QSocks5SocketEnginePrivate::Socks5State) { return QString(); }
static inline QString dump(const QByteArray &) { return QString(); }
#endif

/*
   inserts the host address in buf at pos and updates pos.
   if the func fails the data in buf and the vallue of pos is undefined
*/
static bool qt_socks5_set_host_address_and_port(const QHostAddress &address, quint16 port, QByteArray *pBuf)
{
    QSOCKS5_DEBUG << "setting [" << address << ':' << port << ']';

    union {
        quint16 port;
        quint32 ipv4;
        QIPv6Address ipv6;
        char ptr;
    } data;

    // add address
    if (address.protocol() == QAbstractSocket::IPv4Protocol) {
        data.ipv4 = qToBigEndian<quint32>(address.toIPv4Address());
        pBuf->append(S5_IP_V4);
        pBuf->append(QByteArray::fromRawData(&data.ptr, sizeof data.ipv4));
    } else if (address.protocol() == QAbstractSocket::IPv6Protocol) {
        data.ipv6 = address.toIPv6Address();
        pBuf->append(S5_IP_V6);
        pBuf->append(QByteArray::fromRawData(&data.ptr, sizeof data.ipv6));
    } else {
        return false;
    }

    // add port
    data.port = qToBigEndian<quint16>(port);
    pBuf->append(QByteArray::fromRawData(&data.ptr, sizeof data.port));
    return true;
}

/*
   like above, but for a hostname
*/
static bool qt_socks5_set_host_name_and_port(const QString &hostname, quint16 port, QByteArray *pBuf)
{
    QSOCKS5_DEBUG << "setting [" << hostname << ':' << port << ']';

    QByteArray encodedHostName = QUrl::toAce(hostname);
    QByteArray &buf = *pBuf;

    if (encodedHostName.length() > 255)
        return false;

    buf.append(S5_DOMAINNAME);
    buf.append(uchar(encodedHostName.length()));
    buf.append(encodedHostName);

    // add port
    union {
        quint16 port;
        char ptr;
    } data;
    data.port = qToBigEndian<quint16>(port);
    buf.append(QByteArray::fromRawData(&data.ptr, sizeof data.port));

    return true;
}


/*
   retrives the host address in buf at pos and updates pos.
   if the func fails the value of the address and the pos is undefined
*/
static bool qt_socks5_get_host_address_and_port(const QByteArray &buf, QHostAddress *pAddress, quint16 *pPort, int *pPos)
{
    bool ret = false;
    int pos = *pPos;
    const unsigned char *pBuf = reinterpret_cast<const unsigned char*>(buf.constData());
    QHostAddress address;
    quint16 port = 0;

    if (buf.size() - pos < 1) {
        QSOCKS5_DEBUG << "need more data address/port";
        return false;
    }
    if (pBuf[pos] == S5_IP_V4) {
        pos++;
        if (buf.size() - pos < 4) {
            QSOCKS5_DEBUG << "need more data for ip4 address";
            return false;
        }
        address.setAddress(qFromBigEndian<quint32>(&pBuf[pos]));
        pos += 4;
        ret = true;
    } else if (pBuf[pos] == S5_IP_V6) {
        pos++;
        if (buf.size() - pos < 16) {
            QSOCKS5_DEBUG << "need more data for ip6 address";
            return false;
        }
        QIPv6Address add;
        for (int i = 0; i < 16; ++i)
            add[i] = buf[pos++];
        ret = true;
    } else if (pBuf[pos] == S5_DOMAINNAME){
        // just skip it
        pos++;
        qDebug() << "skipping hostname of len" << uint(pBuf[pos]);
        pos += uchar(pBuf[pos]);
    } else {
        QSOCKS5_DEBUG << "invalid address type" << (int)pBuf[pos];
        ret = false;
    }

    if (ret) {
        if (buf.size() - pos < 2) {
            QSOCKS5_DEBUG << "need more data for port";
            return false;
        }
        port = qFromBigEndian<quint16>(&pBuf[pos]);
        pos += 2;
    }

    if (ret) {
        QSOCKS5_DEBUG << "got [" << address << ':' << port << ']';
        *pAddress = address;
        *pPort = port;
        *pPos = pos;
    }

    return ret;
}

/*
   Returns the difference between msecs and elapsed. If msecs is -1,
   however, -1 is returned.
*/
static int qt_timeout_value(int msecs, int elapsed)
{
    if (msecs == -1)
        return -1;

    int timeout = msecs - elapsed;
    return timeout < 0 ? 0 : timeout;
}

struct QSocks5Data
{
    QTcpSocket *controlSocket;
    QSocks5Authenticator *authenticator;
};

struct QSocks5ConnectData : public QSocks5Data
{
    QByteArray readBuffer;
};

struct QSocks5BindData : public QSocks5Data
{
    QHostAddress localAddress;
    quint16 localPort;
    QHostAddress peerAddress;
    quint16 peerPort;
    QElapsedTimer timeStamp;
};

struct QSocks5RevivedDatagram
{
    QByteArray data;
    QHostAddress address;
    quint16 port;
};

#ifndef QT_NO_UDPSOCKET
struct QSocks5UdpAssociateData : public QSocks5Data
{
    QUdpSocket *udpSocket;
    QHostAddress associateAddress;
    quint16 associatePort;
    QQueue<QSocks5RevivedDatagram> pendingDatagrams;
};
#endif

// needs to be thread safe
class QSocks5BindStore : public QObject
{
public:
    QSocks5BindStore();
    ~QSocks5BindStore();

    void add(int socketDescriptor, QSocks5BindData *bindData);
    bool contains(int socketDescriptor);
    QSocks5BindData *retrieve(int socketDescriptor);

protected:
    void timerEvent(QTimerEvent * event);

    QMutex mutex;
    int sweepTimerId;
    //socket descriptor, data, timestamp
    QHash<int, QSocks5BindData *> store;
};

Q_GLOBAL_STATIC(QSocks5BindStore, socks5BindStore)

QSocks5BindStore::QSocks5BindStore()
    : mutex(QMutex::Recursive)
    , sweepTimerId(-1)
{
    QCoreApplication *app = QCoreApplication::instance();
    if (app && app->thread() != thread())
        moveToThread(app->thread());
}

QSocks5BindStore::~QSocks5BindStore()
{
}

void QSocks5BindStore::add(int socketDescriptor, QSocks5BindData *bindData)
{
    QMutexLocker lock(&mutex);
    if (store.contains(socketDescriptor)) {
        // qDebug() << "delete it";
    }
    bindData->timeStamp.start();
    store.insert(socketDescriptor, bindData);
    // start sweep timer if not started
    if (sweepTimerId == -1)
        sweepTimerId = startTimer(60000);
}

bool QSocks5BindStore::contains(int socketDescriptor)
{
    QMutexLocker lock(&mutex);
    return store.contains(socketDescriptor);
}

QSocks5BindData *QSocks5BindStore::retrieve(int socketDescriptor)
{
    QMutexLocker lock(&mutex);
    if (!store.contains(socketDescriptor))
        return 0;
    QSocks5BindData *bindData = store.take(socketDescriptor);
    if (bindData) {
        if (bindData->controlSocket->thread() != QThread::currentThread()) {
            qWarning("Can not access socks5 bind data from different thread");
            return 0;
        }
    } else {
        QSOCKS5_DEBUG << "__ERROR__ binddata == 0";
    }
    // stop the sweep timer if not needed
    if (store.isEmpty()) {
        killTimer(sweepTimerId);
        sweepTimerId = -1;
    }
    return bindData;
}

void QSocks5BindStore::timerEvent(QTimerEvent * event)
{
    QMutexLocker lock(&mutex);
    if (event->timerId() == sweepTimerId) {
        QSOCKS5_DEBUG << "QSocks5BindStore performing sweep";
        QMutableHashIterator<int, QSocks5BindData *> it(store);
        while (it.hasNext()) {
            it.next();
            if (it.value()->timeStamp.hasExpired(350000)) {
                QSOCKS5_DEBUG << "QSocks5BindStore removing JJJJ";
                it.remove();
            }
        }
    }
}

QSocks5Authenticator::QSocks5Authenticator()
{
}

QSocks5Authenticator::~QSocks5Authenticator()
{
}

char QSocks5Authenticator::methodId()
{
    return 0x00;
}

bool QSocks5Authenticator::beginAuthenticate(QTcpSocket *socket, bool *completed)
{
    Q_UNUSED(socket);
    *completed = true;
    return true;
}

bool QSocks5Authenticator::continueAuthenticate(QTcpSocket *socket, bool *completed)
{
    Q_UNUSED(socket);
    *completed = true;
    return true;
}

bool QSocks5Authenticator::seal(const QByteArray buf, QByteArray *sealedBuf)
{
    *sealedBuf = buf;
    return true;
}

bool QSocks5Authenticator::unSeal(const QByteArray sealedBuf, QByteArray *buf)
{
    *buf = sealedBuf;
    return true;
}

bool QSocks5Authenticator::unSeal(QTcpSocket *sealedSocket, QByteArray *buf)
{
    return unSeal(sealedSocket->readAll(), buf);
}

QSocks5PasswordAuthenticator::QSocks5PasswordAuthenticator(const QString &userName, const QString &password)
{
    this->userName = userName;
    this->password = password;
}

char QSocks5PasswordAuthenticator::methodId()
{
    return 0x02;
}

bool QSocks5PasswordAuthenticator::beginAuthenticate(QTcpSocket *socket, bool *completed)
{
    *completed = false;
    QByteArray uname = userName.toLatin1();
    QByteArray passwd = password.toLatin1();
    QByteArray dataBuf(3 + uname.size() + passwd.size(), 0);
    char *buf = dataBuf.data();
    int pos = 0;
    buf[pos++] = S5_PASSWORDAUTH_VERSION;
    buf[pos++] = uname.size();
    memcpy(&buf[pos], uname.data(), uname.size());
    pos += uname.size();
    buf[pos++] = passwd.size();
    memcpy(&buf[pos], passwd.data(), passwd.size());
    return socket->write(dataBuf) == dataBuf.size();
}

bool QSocks5PasswordAuthenticator::continueAuthenticate(QTcpSocket *socket, bool *completed)
{
    *completed = false;

    if (socket->bytesAvailable() < 2)
        return true;

    QByteArray buf = socket->read(2);
    if (buf.at(0) == S5_PASSWORDAUTH_VERSION && buf.at(1) == 0x00) {
        *completed = true;
        return true;
    }

    // must disconnect
    socket->close();
    return false;
}

QString QSocks5PasswordAuthenticator::errorString()
{
    return QLatin1String("Socks5 user name or password incorrect");
}



QSocks5SocketEnginePrivate::QSocks5SocketEnginePrivate()
    : socks5State(Uninitialized)
    , readNotificationEnabled(false)
    , writeNotificationEnabled(false)
    , exceptNotificationEnabled(false)
    , socketDescriptor(-1)
    , data(0)
    , connectData(0)
#ifndef QT_NO_UDPSOCKET
    , udpData(0)
#endif
    , bindData(0)
    , readNotificationActivated(false)
    , writeNotificationActivated(false)
    , readNotificationPending(false)
    , writeNotificationPending(false)
    , connectionNotificationPending(false)
{
    mode = NoMode;
}

QSocks5SocketEnginePrivate::~QSocks5SocketEnginePrivate()
{
}

void QSocks5SocketEnginePrivate::initialize(Socks5Mode socks5Mode)
{
    Q_Q(QSocks5SocketEngine);

    mode = socks5Mode;
    if (mode == ConnectMode) {
        connectData = new QSocks5ConnectData;
        data = connectData;
#ifndef QT_NO_UDPSOCKET
    } else if (mode == UdpAssociateMode) {
        udpData = new QSocks5UdpAssociateData;
        data = udpData;
        udpData->udpSocket = new QUdpSocket(q);
#ifndef QT_NO_BEARERMANAGEMENT
        udpData->udpSocket->setProperty("_q_networksession", q->property("_q_networksession"));
#endif
        udpData->udpSocket->setProxy(QNetworkProxy::NoProxy);
        QObject::connect(udpData->udpSocket, SIGNAL(readyRead()),
                         q, SLOT(_q_udpSocketReadNotification()),
                         Qt::DirectConnection);
#endif // QT_NO_UDPSOCKET
    } else if (mode == BindMode) {
        bindData = new QSocks5BindData;
        data = bindData;
    }

    data->controlSocket = new QTcpSocket(q);
#ifndef QT_NO_BEARERMANAGEMENT
    data->controlSocket->setProperty("_q_networksession", q->property("_q_networksession"));
#endif
    data->controlSocket->setProxy(QNetworkProxy::NoProxy);
    QObject::connect(data->controlSocket, SIGNAL(connected()), q, SLOT(_q_controlSocketConnected()),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(readyRead()), q, SLOT(_q_controlSocketReadNotification()),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(bytesWritten(qint64)), q, SLOT(_q_controlSocketBytesWritten()),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(error(QAbstractSocket::SocketError)),
                     q, SLOT(_q_controlSocketError(QAbstractSocket::SocketError)),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(disconnected()), q, SLOT(_q_controlSocketDisconnected()),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                     q, SLOT(_q_controlSocketStateChanged(QAbstractSocket::SocketState)),
                     Qt::DirectConnection);

    if (!proxyInfo.user().isEmpty() || !proxyInfo.password().isEmpty()) {
        QSOCKS5_D_DEBUG << "using username/password authentication; user =" << proxyInfo.user();
        data->authenticator = new QSocks5PasswordAuthenticator(proxyInfo.user(), proxyInfo.password());
    } else {
        QSOCKS5_D_DEBUG << "not using authentication";
        data->authenticator = new QSocks5Authenticator();
    }
}

void QSocks5SocketEnginePrivate::setErrorState(Socks5State state, const QString &extraMessage)
{
    Q_Q(QSocks5SocketEngine);

    switch (state) {
    case Uninitialized:
    case Authenticating:
    case AuthenticationMethodsSent:
    case RequestMethodSent:
    case Connected:
    case UdpAssociateSuccess:
    case BindSuccess:
        // these aren't error states
        return;

    case ConnectError:
    case ControlSocketError: {
        QAbstractSocket::SocketError controlSocketError = data->controlSocket->error();
        if (socks5State != Connected) {
            switch (controlSocketError) {
            case QAbstractSocket::ConnectionRefusedError:
                q->setError(QAbstractSocket::ProxyConnectionRefusedError,
                             QSocks5SocketEngine::tr("Connection to proxy refused"));
                break;
            case QAbstractSocket::RemoteHostClosedError:
                q->setError(QAbstractSocket::ProxyConnectionClosedError,
                             QSocks5SocketEngine::tr("Connection to proxy closed prematurely"));
                break;
            case QAbstractSocket::HostNotFoundError:
                q->setError(QAbstractSocket::ProxyNotFoundError,
                             QSocks5SocketEngine::tr("Proxy host not found"));
                break;
            case QAbstractSocket::SocketTimeoutError:
                if (state == ConnectError) {
                    q->setError(QAbstractSocket::ProxyConnectionTimeoutError,
                                 QSocks5SocketEngine::tr("Connection to proxy timed out"));
                    break;
                }
                /* fall through */
            default:
                q->setError(controlSocketError, data->controlSocket->errorString());
                break;
            }
        } else {
            q->setError(controlSocketError, data->controlSocket->errorString());
        }
        break;
    }

    case AuthenticatingError:
        q->setError(QAbstractSocket::ProxyAuthenticationRequiredError,
                    extraMessage.isEmpty() ?
                     QSocks5SocketEngine::tr("Proxy authentication failed") :
                     QSocks5SocketEngine::tr("Proxy authentication failed: %1").arg(extraMessage));
        break;

    case RequestError:
        // error code set by caller (overload)
        break;

    case SocksError:
        q->setError(QAbstractSocket::ProxyProtocolError,
                     QSocks5SocketEngine::tr("SOCKS version 5 protocol error"));
        break;

    case HostNameLookupError:
        q->setError(QAbstractSocket::HostNotFoundError,
                    QAbstractSocket::tr("Host not found"));
        break;
    }

    q->setState(QAbstractSocket::UnconnectedState);
    socks5State = state;
}

void QSocks5SocketEnginePrivate::setErrorState(Socks5State state, Socks5Error socks5error)
{
    Q_Q(QSocks5SocketEngine);
    switch (socks5error) {
    case SocksFailure:
        q->setError(QAbstractSocket::NetworkError,
                     QSocks5SocketEngine::tr("General SOCKSv5 server failure"));
        break;
    case ConnectionNotAllowed:
        q->setError(QAbstractSocket::SocketAccessError,
                     QSocks5SocketEngine::tr("Connection not allowed by SOCKSv5 server"));
        break;
    case NetworkUnreachable:
        q->setError(QAbstractSocket::NetworkError,
                    QAbstractSocket::tr("Network unreachable"));
        break;
    case HostUnreachable:
        q->setError(QAbstractSocket::HostNotFoundError,
                    QAbstractSocket::tr("Host not found"));
        break;
    case ConnectionRefused:
        q->setError(QAbstractSocket::ConnectionRefusedError,
                    QAbstractSocket::tr("Connection refused"));
        break;
    case TTLExpired:
        q->setError(QAbstractSocket::NetworkError,
                     QSocks5SocketEngine::tr("TTL expired"));
        break;
    case CommandNotSupported:
        q->setError(QAbstractSocket::UnsupportedSocketOperationError,
                     QSocks5SocketEngine::tr("SOCKSv5 command not supported"));
        break;
    case AddressTypeNotSupported:
        q->setError(QAbstractSocket::UnsupportedSocketOperationError,
                     QSocks5SocketEngine::tr("Address type not supported"));
        break;

    default:
        q->setError(QAbstractSocket::UnknownSocketError,
                     QSocks5SocketEngine::tr("Unknown SOCKSv5 proxy error code 0x%1").arg(int(socks5error), 16));
        break;
    }

    setErrorState(state, QString());
}

void QSocks5SocketEnginePrivate::reauthenticate()
{
    Q_Q(QSocks5SocketEngine);

    // we require authentication
    QAuthenticator auth;
    emit q->proxyAuthenticationRequired(proxyInfo, &auth);

    if (!auth.user().isEmpty() || !auth.password().isEmpty()) {
        // we have new credentials, let's try again
        QSOCKS5_DEBUG << "authentication failure: retrying connection";
        socks5State = QSocks5SocketEnginePrivate::Uninitialized;

        delete data->authenticator;
        proxyInfo.setUser(auth.user());
        proxyInfo.setPassword(auth.password());
        data->authenticator = new QSocks5PasswordAuthenticator(proxyInfo.user(), proxyInfo.password());

        data->controlSocket->blockSignals(true);
        data->controlSocket->abort();
        data->controlSocket->blockSignals(false);
        data->controlSocket->connectToHost(proxyInfo.hostName(), proxyInfo.port());
    } else {
        // authentication failure

        setErrorState(AuthenticatingError);
        data->controlSocket->close();
        emitConnectionNotification();
    }
}

void QSocks5SocketEnginePrivate::parseAuthenticationMethodReply()
{
    // not enough data to begin
    if (data->controlSocket->bytesAvailable() < 2)
        return;

    QByteArray buf = data->controlSocket->read(2);
    if (buf.at(0) != S5_VERSION_5) {
        QSOCKS5_D_DEBUG << "Socks5 version incorrect";
        setErrorState(SocksError);
        data->controlSocket->close();
        emitConnectionNotification();
        return;
    }

    bool authComplete = false;
    if (uchar(buf.at(1)) == S5_AUTHMETHOD_NONE) {
        authComplete = true;
    } else if (uchar(buf.at(1)) == S5_AUTHMETHOD_NOTACCEPTABLE) {
        reauthenticate();
        return;
    } else if (buf.at(1) != data->authenticator->methodId()
               || !data->authenticator->beginAuthenticate(data->controlSocket, &authComplete)) {
        setErrorState(AuthenticatingError, QLatin1String("Socks5 host did not support authentication method."));
        socketError = QAbstractSocket::SocketAccessError; // change the socket error
        emitConnectionNotification();
        return;
    }

    if (authComplete)
        sendRequestMethod();
    else
        socks5State = Authenticating;
}

void QSocks5SocketEnginePrivate::parseAuthenticatingReply()
{
    bool authComplete = false;
    if (!data->authenticator->continueAuthenticate(data->controlSocket, &authComplete)) {
        reauthenticate();
        return;
    }
    if (authComplete)
        sendRequestMethod();
}

void QSocks5SocketEnginePrivate::sendRequestMethod()
{
    QHostAddress address;
    quint16 port = 0;
    char command = 0;
    if (mode == ConnectMode) {
        command = S5_CONNECT;
        address = peerAddress;
        port = peerPort;
    } else if (mode == BindMode) {
        command = S5_BIND;
        address = localAddress;
        port = localPort;
    } else {
#ifndef QT_NO_UDPSOCKET
        command = S5_UDP_ASSOCIATE;
        address = localAddress; //data->controlSocket->localAddress();
        port = localPort;
#endif
    }

    QByteArray buf;
    buf.reserve(270); // big enough for domain name;
    buf[0] = S5_VERSION_5;
    buf[1] = command;
    buf[2] = 0x00;
    if (peerName.isEmpty() && !qt_socks5_set_host_address_and_port(address, port, &buf)) {
        QSOCKS5_DEBUG << "error setting address" << address << " : " << port;
        //### set error code ....
        return;
    } else if (!peerName.isEmpty() && !qt_socks5_set_host_name_and_port(peerName, port, &buf)) {
        QSOCKS5_DEBUG << "error setting address" << address << " : " << port;
        //### set error code ....
        return;
    }
    QSOCKS5_DEBUG << "sending" << dump(buf);
    QByteArray sealedBuf;
    if (!data->authenticator->seal(buf, &sealedBuf)) {
        // ### Handle this error.
    }
    data->controlSocket->write(sealedBuf);
    data->controlSocket->flush();
    socks5State = RequestMethodSent;
}

void QSocks5SocketEnginePrivate::parseRequestMethodReply()
{
    Q_Q(QSocks5SocketEngine);
    QSOCKS5_DEBUG << "parseRequestMethodReply()";

    QByteArray inBuf;
    if (!data->authenticator->unSeal(data->controlSocket, &inBuf)) {
        // ### check error and not just not enough data
        QSOCKS5_DEBUG << "unSeal failed, needs more data";
        return;
    }
    QSOCKS5_DEBUG << dump(inBuf);
    if (inBuf.size() < 2) {
        QSOCKS5_DEBUG << "need more data for request reply header .. put this data somewhere";
        return;
    }

    QHostAddress address;
    quint16 port = 0;

    if (inBuf.at(0) != S5_VERSION_5 || inBuf.length() < 3 || inBuf.at(2) != 0x00) {
        QSOCKS5_DEBUG << "socks protocol error";
        setErrorState(SocksError);
    } else if (inBuf.at(1) != S5_SUCCESS) {
        Socks5Error socks5Error = Socks5Error(inBuf.at(1));
        QSOCKS5_DEBUG <<  "Request error :" << socks5Error;
        if ((socks5Error == SocksFailure || socks5Error == ConnectionNotAllowed)
            && !peerName.isEmpty()) {
            // Dante seems to use this error code to indicate hostname resolution failure
            setErrorState(HostNameLookupError);
        } else {
            setErrorState(RequestError, socks5Error);
        }
    } else {
        // connection success, retrieve the remote addresses
        int pos = 3;
        if (!qt_socks5_get_host_address_and_port(inBuf, &address, &port, &pos)) {
            QSOCKS5_DEBUG << "error getting address";
            setErrorState(SocksError);
        } else {
            inBuf.remove(0, pos);
            for (int i = inBuf.size() - 1; i >= 0 ; --i)
                data->controlSocket->ungetChar(inBuf.at(i));
        }
    }

    if (socks5State == RequestMethodSent) {
        // no error
        localAddress = address;
        localPort = port;

        if (mode == ConnectMode) {
            socks5State = Connected;
            // notify the upper layer that we're done
            q->setState(QAbstractSocket::ConnectedState);
            emitConnectionNotification();
        } else if (mode == BindMode) {
            socks5State = BindSuccess;
            q->setState(QAbstractSocket::ListeningState);
        } else {
            socks5State = UdpAssociateSuccess;
        }
    } else if (socks5State == BindSuccess) {
        // no error and we got a connection
        bindData->peerAddress = address;
        bindData->peerPort = port;

        emitReadNotification();
    } else {
        // got an error
        data->controlSocket->close();
        emitConnectionNotification();
    }
}

void QSocks5SocketEnginePrivate::_q_emitPendingReadNotification()
{
    Q_Q(QSocks5SocketEngine);
    readNotificationPending = false;
    if (readNotificationEnabled) {
        QSOCKS5_D_DEBUG << "emitting readNotification";
        QPointer<QSocks5SocketEngine> qq = q;
        emit q->readNotification();
        if (!qq)
            return;
        // check if there needs to be a new zero read notification
        if (data && data->controlSocket->state() == QAbstractSocket::UnconnectedState
                && data->controlSocket->error() == QAbstractSocket::RemoteHostClosedError) {
            connectData->readBuffer.clear();
            emitReadNotification();
        }
    }
}

void QSocks5SocketEnginePrivate::emitReadNotification()
{
    Q_Q(QSocks5SocketEngine);
    readNotificationActivated = true;
    if (readNotificationEnabled && !readNotificationPending) {
        QSOCKS5_D_DEBUG << "queueing readNotification";
        readNotificationPending = true;
        QMetaObject::invokeMethod(q, "_q_emitPendingReadNotification", Qt::QueuedConnection);
    }
}

void QSocks5SocketEnginePrivate::_q_emitPendingWriteNotification()
{
    writeNotificationPending = false;
    Q_Q(QSocks5SocketEngine);
    if (writeNotificationEnabled) {
        QSOCKS5_D_DEBUG << "emitting writeNotification";
        emit q->writeNotification();
    }
}

void QSocks5SocketEnginePrivate::emitWriteNotification()
{
    Q_Q(QSocks5SocketEngine);
    writeNotificationActivated = true;
    if (writeNotificationEnabled && !writeNotificationPending) {
        QSOCKS5_D_DEBUG << "queueing writeNotification";
        writeNotificationPending = true;
        QMetaObject::invokeMethod(q, "_q_emitPendingWriteNotification", Qt::QueuedConnection);
    }
}

void QSocks5SocketEnginePrivate::_q_emitPendingConnectionNotification()
{
    connectionNotificationPending = false;
    Q_Q(QSocks5SocketEngine);
    QSOCKS5_D_DEBUG << "emitting connectionNotification";
    emit q->connectionNotification();
}

void QSocks5SocketEnginePrivate::emitConnectionNotification()
{
    Q_Q(QSocks5SocketEngine);
    QSOCKS5_D_DEBUG << "queueing connectionNotification";
    connectionNotificationPending = true;
    QMetaObject::invokeMethod(q, "_q_emitPendingConnectionNotification", Qt::QueuedConnection);
}

QSocks5SocketEngine::QSocks5SocketEngine(QObject *parent)
:QAbstractSocketEngine(*new QSocks5SocketEnginePrivate(), parent)
{
}

QSocks5SocketEngine::~QSocks5SocketEngine()
{
    Q_D(QSocks5SocketEngine);

    if (d->data) {
        delete d->data->authenticator;
        delete d->data->controlSocket;
    }
    if (d->connectData)
        delete d->connectData;
#ifndef QT_NO_UDPSOCKET
    if (d->udpData) {
        delete d->udpData->udpSocket;
        delete d->udpData;
    }
#endif
    if (d->bindData)
        delete d->bindData;
}

static QBasicAtomicInt descriptorCounter = Q_BASIC_ATOMIC_INITIALIZER(1);

bool QSocks5SocketEngine::initialize(QAbstractSocket::SocketType type, QAbstractSocket::NetworkLayerProtocol protocol)
{
    Q_D(QSocks5SocketEngine);

    d->socketDescriptor = descriptorCounter.fetchAndAddRelaxed(1);

    d->socketType = type;
    d->socketProtocol = protocol;

    return true;
}

bool QSocks5SocketEngine::initialize(int socketDescriptor, QAbstractSocket::SocketState socketState)
{
    Q_D(QSocks5SocketEngine);

    QSOCKS5_Q_DEBUG << "initialize" << socketDescriptor;

    // this is only valid for the other side of a bind, nothing else is supported

    if (socketState != QAbstractSocket::ConnectedState) {
        //### must be connected state ???
        return false;
    }

    QSocks5BindData *bindData = socks5BindStore()->retrieve(socketDescriptor);
    if (bindData) {

        d->socketState = QAbstractSocket::ConnectedState;
        d->socketType = QAbstractSocket::TcpSocket;
        d->connectData = new QSocks5ConnectData;
        d->data = d->connectData;
        d->mode = QSocks5SocketEnginePrivate::ConnectMode;
        d->data->controlSocket = bindData->controlSocket;
        bindData->controlSocket = 0;
        d->data->controlSocket->setParent(this);
        d->socketProtocol = d->data->controlSocket->localAddress().protocol();
        d->data->authenticator = bindData->authenticator;
        bindData->authenticator = 0;
        d->localPort = bindData->localPort;
        d->localAddress = bindData->localAddress;
        d->peerPort = bindData->peerPort;
        d->peerAddress = bindData->peerAddress;
        delete bindData;

        QObject::connect(d->data->controlSocket, SIGNAL(connected()), this, SLOT(_q_controlSocketConnected()),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(readyRead()), this, SLOT(_q_controlSocketReadNotification()),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(bytesWritten(qint64)), this, SLOT(_q_controlSocketBytesWritten()),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(_q_controlSocketError(QAbstractSocket::SocketError)),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(disconnected()), this, SLOT(_q_controlSocketDisconnected()),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                         this, SLOT(_q_controlSocketStateChanged(QAbstractSocket::SocketState)),
                         Qt::DirectConnection);

        d->socks5State = QSocks5SocketEnginePrivate::Connected;

        if (d->data->controlSocket->bytesAvailable() != 0)
            d->_q_controlSocketReadNotification();
        return true;
    }
    return false;
}

void QSocks5SocketEngine::setProxy(const QNetworkProxy &networkProxy)
{
    Q_D(QSocks5SocketEngine);
    d->proxyInfo = networkProxy;
}

int QSocks5SocketEngine::socketDescriptor() const
{
    Q_D(const QSocks5SocketEngine);
    return d->socketDescriptor;
}

bool QSocks5SocketEngine::isValid() const
{
    Q_D(const QSocks5SocketEngine);
    return d->socketType != QAbstractSocket::UnknownSocketType
           && d->socks5State != QSocks5SocketEnginePrivate::SocksError
           && (d->socketError == QAbstractSocket::UnknownSocketError
               || d->socketError == QAbstractSocket::SocketTimeoutError
               || d->socketError == QAbstractSocket::UnfinishedSocketOperationError);
}

bool QSocks5SocketEngine::connectInternal()
{
    Q_D(QSocks5SocketEngine);

    if (!d->data) {
        if (socketType() == QAbstractSocket::TcpSocket) {
            d->initialize(QSocks5SocketEnginePrivate::ConnectMode);
#ifndef QT_NO_UDPSOCKET
        } else if (socketType() == QAbstractSocket::UdpSocket) {
            d->initialize(QSocks5SocketEnginePrivate::UdpAssociateMode);
            // all udp needs to be bound
            if (!bind(QHostAddress(QLatin1String("0.0.0.0")), 0))
                return false;

            setState(QAbstractSocket::ConnectedState);
            return true;
#endif
        } else {
            qFatal("QSocks5SocketEngine::connectToHost: in QTcpServer mode");
            return false;
        }
    }

    if (d->socks5State == QSocks5SocketEnginePrivate::Uninitialized
        && d->socketState != QAbstractSocket::ConnectingState) {
        setState(QAbstractSocket::ConnectingState);
        d->data->controlSocket->connectToHost(d->proxyInfo.hostName(), d->proxyInfo.port());
        return false;
    }
    return false;
}

bool QSocks5SocketEngine::connectToHost(const QHostAddress &address, quint16 port)
{
    Q_D(QSocks5SocketEngine);
    QSOCKS5_DEBUG << "connectToHost" << address << ':' << port;

    setPeerAddress(address);
    setPeerPort(port);
    d->peerName.clear();

    return connectInternal();
}

bool QSocks5SocketEngine::connectToHostByName(const QString &hostname, quint16 port)
{
    Q_D(QSocks5SocketEngine);

    setPeerAddress(QHostAddress());
    setPeerPort(port);
    d->peerName = hostname;

    return connectInternal();
}

void QSocks5SocketEnginePrivate::_q_controlSocketConnected()
{
    QSOCKS5_DEBUG << "_q_controlSocketConnected";
    QByteArray buf(3, 0);
    buf[0] = S5_VERSION_5;
    buf[1] = 0x01;
    buf[2] = data->authenticator->methodId();
    data->controlSocket->write(buf);
    socks5State = AuthenticationMethodsSent;
}

void QSocks5SocketEnginePrivate::_q_controlSocketReadNotification()
{
    QSOCKS5_D_DEBUG << "_q_controlSocketReadNotification socks5state" <<  s5StateToString(socks5State)
                    << "bytes available" << data->controlSocket->bytesAvailable();

    if (data->controlSocket->bytesAvailable() == 0) {
        QSOCKS5_D_DEBUG << "########## bogus read why do we get these ... on windows only";
        return;
    }

    switch (socks5State) {
        case AuthenticationMethodsSent:
            parseAuthenticationMethodReply();
            break;
        case Authenticating:
            parseAuthenticatingReply();
            break;
        case RequestMethodSent:
            parseRequestMethodReply();
            break;
        case Connected: {
            QByteArray buf;
            if (!data->authenticator->unSeal(data->controlSocket, &buf)) {
                // qDebug() << "unseal error maybe need to wait for more data";
            }
            if (buf.size()) {
                QSOCKS5_DEBUG << dump(buf);
                connectData->readBuffer += buf;
                emitReadNotification();
            }
            break;
        }
        case BindSuccess:
            // only get here if command is bind
            if (mode == BindMode) {
                parseRequestMethodReply();
                break;
            }

            // fall through
        default:
            qWarning("QSocks5SocketEnginePrivate::_q_controlSocketReadNotification: "
                     "Unexpectedly received data while in state=%d and mode=%d",
                     socks5State, mode);
            break;
    };
}

void QSocks5SocketEnginePrivate::_q_controlSocketBytesWritten()
{
    QSOCKS5_DEBUG << "_q_controlSocketBytesWritten";

    if (socks5State != Connected
        || (mode == ConnectMode
        && data->controlSocket->bytesToWrite()))
        return;
    if (data->controlSocket->bytesToWrite() < MaxWriteBufferSize) {
        emitWriteNotification();
        writeNotificationActivated = false;
    }
}

void QSocks5SocketEnginePrivate::_q_controlSocketError(QAbstractSocket::SocketError error)
{
    QSOCKS5_D_DEBUG << "controlSocketError" << error << data->controlSocket->errorString();

    if (error == QAbstractSocket::SocketTimeoutError)
        return;                 // ignore this error -- comes from the waitFor* functions

    if (error == QAbstractSocket::RemoteHostClosedError
        && socks5State == Connected) {
        // clear the read buffer in connect mode so that bytes available returns 0
        // if there already is a read notification pending then this will be processed first
        if (!readNotificationPending)
            connectData->readBuffer.clear();
        emitReadNotification();
        data->controlSocket->close();
        // cause a disconnect in the outer socket
        emitWriteNotification();
    } else if (socks5State == Uninitialized
               || socks5State == AuthenticationMethodsSent
               || socks5State == Authenticating
               || socks5State == RequestMethodSent) {
        setErrorState(socks5State == Uninitialized ? ConnectError : ControlSocketError);
        data->controlSocket->close();
        emitConnectionNotification();
    } else {
        q_func()->setError(data->controlSocket->error(), data->controlSocket->errorString());
        emitReadNotification();
        emitWriteNotification();
    }
}

void QSocks5SocketEnginePrivate::_q_controlSocketDisconnected()
{
    QSOCKS5_D_DEBUG << "_q_controlSocketDisconnected";
}

void QSocks5SocketEnginePrivate::_q_controlSocketStateChanged(QAbstractSocket::SocketState state)
{
    QSOCKS5_D_DEBUG << "_q_controlSocketStateChanged" << state;
}

#ifndef QT_NO_UDPSOCKET
void QSocks5SocketEnginePrivate::checkForDatagrams() const
{
    // udp should be unbuffered so we need to do some polling at certain points
    if (udpData->udpSocket->hasPendingDatagrams())
        const_cast<QSocks5SocketEnginePrivate *>(this)->_q_udpSocketReadNotification();
}

void QSocks5SocketEnginePrivate::_q_udpSocketReadNotification()
{
    QSOCKS5_D_DEBUG << "_q_udpSocketReadNotification()";

    // check some state stuff
    if (!udpData->udpSocket->hasPendingDatagrams()) {
        QSOCKS5_D_DEBUG << "false read ??";
        return;
    }

    while (udpData->udpSocket->hasPendingDatagrams()) {
        QByteArray sealedBuf(udpData->udpSocket->pendingDatagramSize(), 0);
        QSOCKS5_D_DEBUG << "new datagram";
        udpData->udpSocket->readDatagram(sealedBuf.data(), sealedBuf.size());
        QByteArray inBuf;
        if (!data->authenticator->unSeal(sealedBuf, &inBuf)) {
            QSOCKS5_D_DEBUG << "failed unsealing datagram discarding";
            return;
        }
        QSOCKS5_DEBUG << dump(inBuf);
        int pos = 0;
        const char *buf = inBuf.constData();
        if (inBuf.size() < 4) {
            QSOCKS5_D_DEBUG << "bugus udp data, discarding";
            return;
        }
        QSocks5RevivedDatagram datagram;
        if (buf[pos++] != 0 || buf[pos++] != 0) {
            QSOCKS5_D_DEBUG << "invalid datagram discarding";
            return;
        }
        if (buf[pos++] != 0) { //### add fragmentation reading support
            QSOCKS5_D_DEBUG << "don't support fragmentation yet disgarding";
            return;
        }
        if (!qt_socks5_get_host_address_and_port(inBuf, &datagram.address, &datagram.port, &pos)) {
            QSOCKS5_D_DEBUG << "failed to get address from datagram disgarding";
            return;
        }
        datagram.data = QByteArray(&buf[pos], inBuf.size() - pos);
        udpData->pendingDatagrams.enqueue(datagram);
    }
    emitReadNotification();
}
#endif // QT_NO_UDPSOCKET

bool QSocks5SocketEngine::bind(const QHostAddress &address, quint16 port)
{
    Q_D(QSocks5SocketEngine);

    // when bind wee will block until the bind is finished as the info from the proxy server is needed

    if (!d->data) {
        if (socketType() == QAbstractSocket::TcpSocket) {
            d->initialize(QSocks5SocketEnginePrivate::BindMode);
#ifndef QT_NO_UDPSOCKET
        } else if (socketType() == QAbstractSocket::UdpSocket) {
            d->initialize(QSocks5SocketEnginePrivate::UdpAssociateMode);
#endif
        } else {
            //### something invalid
            return false;
        }
    }

#ifndef QT_NO_UDPSOCKET
    if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode) {
        if (!d->udpData->udpSocket->bind(address, port)) {
            QSOCKS5_Q_DEBUG << "local udp bind failed";
            setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
            return false;
        }
        d->localAddress = d->udpData->udpSocket->localAddress();
        d->localPort = d->udpData->udpSocket->localPort();
    } else
#endif
    if (d->mode == QSocks5SocketEnginePrivate::BindMode) {
        d->localAddress = address;
        d->localPort = port;
    } else {
        //### something invalid
        return false;
    }

    int msecs = SOCKS5_BLOCKING_BIND_TIMEOUT;
    QElapsedTimer stopWatch;
    stopWatch.start();
    d->data->controlSocket->connectToHost(d->proxyInfo.hostName(), d->proxyInfo.port());
    if (!d->waitForConnected(msecs, 0) ||
        d->data->controlSocket->state() == QAbstractSocket::UnconnectedState) {
        // waitForConnected sets the error state and closes the socket
        QSOCKS5_Q_DEBUG << "waitForConnected to proxy server" << d->data->controlSocket->errorString();
        return false;
    }
    if (d->socks5State == QSocks5SocketEnginePrivate::BindSuccess) {
        setState(QAbstractSocket::BoundState);
        return true;
#ifndef QT_NO_UDPSOCKET
    } else if (d->socks5State == QSocks5SocketEnginePrivate::UdpAssociateSuccess) {
        setState(QAbstractSocket::BoundState);
        d->udpData->associateAddress = d->localAddress;
        d->localAddress = QHostAddress();
        d->udpData->associatePort = d->localPort;
        d->localPort = 0;
        QUdpSocket dummy;
#ifndef QT_NO_BEARERMANAGEMENT
        dummy.setProperty("_q_networksession", property("_q_networksession"));
#endif
        dummy.setProxy(QNetworkProxy::NoProxy);
        if (!dummy.bind()
            || writeDatagram(0,0, d->data->controlSocket->localAddress(), dummy.localPort()) != 0
            || !dummy.waitForReadyRead(qt_timeout_value(msecs, stopWatch.elapsed()))
            || dummy.readDatagram(0,0, &d->localAddress, &d->localPort) != 0) {
            QSOCKS5_DEBUG << "udp actual address and port lookup failed";
            setState(QAbstractSocket::UnconnectedState);
            setError(dummy.error(), dummy.errorString());
            d->data->controlSocket->close();
            //### reset and error
            return false;
        }
        QSOCKS5_DEBUG << "udp actual address and port" << d->localAddress << ':' << d->localPort;
        return true;
#endif // QT_NO_UDPSOCKET
    }

    // binding timed out
    setError(QAbstractSocket::SocketTimeoutError,
             QLatin1String(QT_TRANSLATE_NOOP("QSocks5SocketEngine", "Network operation timed out")));

///###    delete d->udpSocket;
///###    d->udpSocket = 0;
    return false;
}


bool QSocks5SocketEngine::listen()
{
    Q_D(QSocks5SocketEngine);

    QSOCKS5_Q_DEBUG << "listen()";

    // check that we are in bound and then go to listening.
    if (d->socketState == QAbstractSocket::BoundState) {
        d->socketState = QAbstractSocket::ListeningState;

        // check if we already have a connection
        if (d->socks5State == QSocks5SocketEnginePrivate::BindSuccess)
            d->emitReadNotification();

        return true;
    }
    return false;
}

int QSocks5SocketEngine::accept()
{
    Q_D(QSocks5SocketEngine);
    // check we are listing ---

    QSOCKS5_Q_DEBUG << "accept()";

    if (d->socks5State == QSocks5SocketEnginePrivate::BindSuccess) {
        QSOCKS5_Q_DEBUG << "BindSuccess adding" << d->socketDescriptor << "to the bind store";
        d->data->controlSocket->disconnect();
        d->data->controlSocket->setParent(0);
        d->bindData->localAddress = d->localAddress;
        d->bindData->localPort = d->localPort;
        int sd = d->socketDescriptor;
        socks5BindStore()->add(sd, d->bindData);
        d->data = 0;
        d->bindData = 0;
        d->socketDescriptor = 0;
        //### do something about this socket layer ... set it closed and an error about why ...
        // reset state and local port/address
        d->socks5State = QSocks5SocketEnginePrivate::Uninitialized; // ..??
        d->socketState = QAbstractSocket::UnconnectedState;
        return sd;
    }
    return -1;
}

void QSocks5SocketEngine::close()
{
    QSOCKS5_Q_DEBUG << "close()";
    Q_D(QSocks5SocketEngine);
    if (d->data && d->data->controlSocket) {
        if (d->data->controlSocket->state() == QAbstractSocket::ConnectedState) {
            int msecs = 100;
            QElapsedTimer stopWatch;
            stopWatch.start();
            while (!d->data->controlSocket->bytesToWrite()) {
               if (!d->data->controlSocket->waitForBytesWritten(qt_timeout_value(msecs, stopWatch.elapsed())))
                   break;
            }
        }
        d->data->controlSocket->close();
    }
#ifndef QT_NO_UDPSOCKET
    if (d->udpData && d->udpData->udpSocket)
        d->udpData->udpSocket->close();
#endif
}

qint64 QSocks5SocketEngine::bytesAvailable() const
{
    Q_D(const QSocks5SocketEngine);
    if (d->mode == QSocks5SocketEnginePrivate::ConnectMode)
        return d->connectData->readBuffer.size();
#ifndef QT_NO_UDPSOCKET
    else if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode
             && !d->udpData->pendingDatagrams.isEmpty())
        return d->udpData->pendingDatagrams.first().data.size();
#endif
    return 0;
}

qint64 QSocks5SocketEngine::read(char *data, qint64 maxlen)
{
    Q_D(QSocks5SocketEngine);
    QSOCKS5_Q_DEBUG << "read( , maxlen = " << maxlen << ')';
    if (d->mode == QSocks5SocketEnginePrivate::ConnectMode) {
        if (d->connectData->readBuffer.size() == 0) {
            if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState) {
                //imitate remote closed
                close();
                setError(QAbstractSocket::RemoteHostClosedError,
                         QLatin1String("Remote host closed connection###"));
                setState(QAbstractSocket::UnconnectedState);
                return -1;
            } else {
                return 0;       // nothing to be read
            }
        }
        qint64 copy = qMin<qint64>(d->connectData->readBuffer.size(), maxlen);
        memcpy(data, d->connectData->readBuffer.constData(), copy);
        d->connectData->readBuffer.remove(0, copy);
        QSOCKS5_DEBUG << "read" << dump(QByteArray(data, copy));
        return copy;
#ifndef QT_NO_UDPSOCKET
    } else if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode) {
        return readDatagram(data, maxlen);
#endif
    }
    return 0;
}

qint64 QSocks5SocketEngine::write(const char *data, qint64 len)
{
    Q_D(QSocks5SocketEngine);
    QSOCKS5_Q_DEBUG << "write" << dump(QByteArray(data, len));

    if (d->mode == QSocks5SocketEnginePrivate::ConnectMode) {
        // clamp down the amount of bytes to transfer at once
        len = qMin<qint64>(len, MaxWriteBufferSize) - d->data->controlSocket->bytesToWrite();
        if (len <= 0)
            return 0;

        QByteArray buf = QByteArray::fromRawData(data, len);
        QByteArray sealedBuf;
        if (!d->data->authenticator->seal(buf, &sealedBuf)) {
            // ### Handle this error.
        }

        qint64 written = d->data->controlSocket->write(sealedBuf);
        if (written <= 0) {
            QSOCKS5_Q_DEBUG << "native write returned" << written;
            return written;
        }
        d->data->controlSocket->waitForBytesWritten(0);
        //NB: returning len rather than written for the OK case, because the "sealing" may increase the length
        return len;
#ifndef QT_NO_UDPSOCKET
    } else if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode) {
        // send to connected address
        return writeDatagram(data, len, d->peerAddress, d->peerPort);
#endif
    }
    //### set an error ???
    return -1;
}

#ifndef QT_NO_UDPSOCKET
#ifndef QT_NO_NETWORKINTERFACE
bool QSocks5SocketEngine::joinMulticastGroup(const QHostAddress &,
                                             const QNetworkInterface &)
{
    setError(QAbstractSocket::UnsupportedSocketOperationError,
             QLatin1String("Operation on socket is not supported"));
    return false;
}

bool QSocks5SocketEngine::leaveMulticastGroup(const QHostAddress &,
                                              const QNetworkInterface &)
{
    setError(QAbstractSocket::UnsupportedSocketOperationError,
             QLatin1String("Operation on socket is not supported"));
    return false;
}


QNetworkInterface QSocks5SocketEngine::multicastInterface() const
{
    return QNetworkInterface();
}

bool QSocks5SocketEngine::setMulticastInterface(const QNetworkInterface &)
{
    setError(QAbstractSocket::UnsupportedSocketOperationError,
             QLatin1String("Operation on socket is not supported"));
    return false;
}
#endif // QT_NO_NETWORKINTERFACE

qint64 QSocks5SocketEngine::readDatagram(char *data, qint64 maxlen, QHostAddress *addr,
                                        quint16 *port)
{
    Q_D(QSocks5SocketEngine);

    d->checkForDatagrams();

    if (d->udpData->pendingDatagrams.isEmpty())
        return 0;

    QSocks5RevivedDatagram datagram = d->udpData->pendingDatagrams.dequeue();
    int copyLen = qMin<int>(maxlen, datagram.data.size());
    memcpy(data, datagram.data.constData(), copyLen);
    if (addr)
        *addr = datagram.address;
    if (port)
        *port = datagram.port;
    return copyLen;
}

qint64 QSocks5SocketEngine::writeDatagram(const char *data, qint64 len, const QHostAddress &address,
                                         quint16 port)
{
    Q_D(QSocks5SocketEngine);

    // it is possible to send with out first binding with udp, but socks5 requires a bind.
    if (!d->data) {
        d->initialize(QSocks5SocketEnginePrivate::UdpAssociateMode);
        // all udp needs to be bound
        if (!bind(QHostAddress(QLatin1String("0.0.0.0")), 0)) {
            //### set error
            return -1;
        }
    }

    QByteArray outBuf;
    outBuf.reserve(270 + len);
    outBuf[0] = 0x00;
    outBuf[1] = 0x00;
    outBuf[2] = 0x00;
    if (!qt_socks5_set_host_address_and_port(address, port, &outBuf)) {
    }
    outBuf += QByteArray(data, len);
    QSOCKS5_DEBUG << "sending" << dump(outBuf);
    QByteArray sealedBuf;
    if (!d->data->authenticator->seal(outBuf, &sealedBuf)) {
        QSOCKS5_DEBUG << "sealing data failed";
        setError(QAbstractSocket::SocketAccessError, d->data->authenticator->errorString());
        return -1;
    }
    if (d->udpData->udpSocket->writeDatagram(sealedBuf, d->udpData->associateAddress, d->udpData->associatePort) != sealedBuf.size()) {
        //### try frgamenting
        if (d->udpData->udpSocket->error() == QAbstractSocket::DatagramTooLargeError)
            setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
        //### else maybe more serious error
        return -1;
    }

    return len;
}

bool QSocks5SocketEngine::hasPendingDatagrams() const
{
    Q_D(const QSocks5SocketEngine);
    Q_INIT_CHECK(false);

    d->checkForDatagrams();

    return !d->udpData->pendingDatagrams.isEmpty();
}

qint64 QSocks5SocketEngine::pendingDatagramSize() const
{
    Q_D(const QSocks5SocketEngine);

    d->checkForDatagrams();

    if (!d->udpData->pendingDatagrams.isEmpty())
        return d->udpData->pendingDatagrams.head().data.size();
    return 0;
}
#endif // QT_NO_UDPSOCKET

qint64 QSocks5SocketEngine::bytesToWrite() const
{
    Q_D(const QSocks5SocketEngine);
    if (d->data && d->data->controlSocket) {
        return d->data->controlSocket->bytesToWrite();
    } else {
        return 0;
    }
}

int QSocks5SocketEngine::option(SocketOption option) const
{
    Q_D(const QSocks5SocketEngine);
    if (d->data && d->data->controlSocket) {
        // convert the enum and call the real socket
        if (option == QAbstractSocketEngine::LowDelayOption)
            return d->data->controlSocket->socketOption(QAbstractSocket::LowDelayOption).toInt();
        if (option == QAbstractSocketEngine::KeepAliveOption)
            return d->data->controlSocket->socketOption(QAbstractSocket::KeepAliveOption).toInt();
    }
    return -1;
}

bool QSocks5SocketEngine::setOption(SocketOption option, int value)
{
    Q_D(QSocks5SocketEngine);
    if (d->data && d->data->controlSocket) {
        // convert the enum and call the real socket
        if (option == QAbstractSocketEngine::LowDelayOption)
            d->data->controlSocket->setSocketOption(QAbstractSocket::LowDelayOption, value);
        if (option == QAbstractSocketEngine::KeepAliveOption)
            d->data->controlSocket->setSocketOption(QAbstractSocket::KeepAliveOption, value);
        return true;
    }
    return false;
}

bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
{
    if (data->controlSocket->state() == QAbstractSocket::UnconnectedState)
        return false;

    const Socks5State wantedState =
        mode == ConnectMode ? Connected :
        mode == BindMode ? BindSuccess :
        UdpAssociateSuccess;

    QElapsedTimer stopWatch;
    stopWatch.start();

    while (socks5State != wantedState) {
        if (!data->controlSocket->waitForReadyRead(qt_timeout_value(msecs, stopWatch.elapsed()))) {
            if (data->controlSocket->state() == QAbstractSocket::UnconnectedState)
                return true;

            setErrorState(QSocks5SocketEnginePrivate::ControlSocketError);
            if (timedOut && data->controlSocket->error() == QAbstractSocket::SocketTimeoutError)
                *timedOut = true;
            return false;
        }
    }

    return true;
}

bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
{
    Q_D(QSocks5SocketEngine);
    QSOCKS5_DEBUG << "waitForRead" << msecs;

    d->readNotificationActivated = false;

    QElapsedTimer stopWatch;
    stopWatch.start();

    // are we connected yet?
    if (!d->waitForConnected(msecs, timedOut))
        return false;
    if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
        return true;

    // we're connected
    if (d->mode == QSocks5SocketEnginePrivate::ConnectMode ||
        d->mode == QSocks5SocketEnginePrivate::BindMode) {
        while (!d->readNotificationActivated) {
            if (!d->data->controlSocket->waitForReadyRead(qt_timeout_value(msecs, stopWatch.elapsed()))) {
                if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
                    return true;

                setError(d->data->controlSocket->error(), d->data->controlSocket->errorString());
                if (timedOut && d->data->controlSocket->error() == QAbstractSocket::SocketTimeoutError)
                    *timedOut = true;
                return false;
            }
        }
#ifndef QT_NO_UDPSOCKET
    } else {
        while (!d->readNotificationActivated) {
            if (!d->udpData->udpSocket->waitForReadyRead(qt_timeout_value(msecs, stopWatch.elapsed()))) {
                setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
                if (timedOut && d->udpData->udpSocket->error() == QAbstractSocket::SocketTimeoutError)
                    *timedOut = true;
                return false;
            }
        }
#endif // QT_NO_UDPSOCKET
    }


    bool ret = d->readNotificationActivated;
    d->readNotificationActivated = false;

    QSOCKS5_DEBUG << "waitForRead returned" << ret;
    return ret;
}


bool QSocks5SocketEngine::waitForWrite(int msecs, bool *timedOut)
{
    Q_D(QSocks5SocketEngine);
    QSOCKS5_DEBUG << "waitForWrite" << msecs;

    QElapsedTimer stopWatch;
    stopWatch.start();

    // are we connected yet?
    if (!d->waitForConnected(msecs, timedOut))
        return false;
    if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
        return true;

    // we're connected

    // flush any bytes we may still have buffered in the time that we have left
    if (d->data->controlSocket->bytesToWrite())
        d->data->controlSocket->waitForBytesWritten(qt_timeout_value(msecs, stopWatch.elapsed()));
    while ((msecs == -1 || stopWatch.elapsed() < msecs)
           && d->data->controlSocket->state() == QAbstractSocket::ConnectedState
           && d->data->controlSocket->bytesToWrite() >= MaxWriteBufferSize)
        d->data->controlSocket->waitForBytesWritten(qt_timeout_value(msecs, stopWatch.elapsed()));
    return d->data->controlSocket->bytesToWrite() < MaxWriteBufferSize;
}

bool QSocks5SocketEngine::waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                                            bool checkRead, bool checkWrite,
                                            int msecs, bool *timedOut)
{
    Q_UNUSED(checkRead);
    if (!checkWrite) {
        bool canRead = waitForRead(msecs, timedOut);
        if (readyToRead)
            *readyToRead = canRead;
        return canRead;
    }

    bool canWrite = waitForWrite(msecs, timedOut);
    if (readyToWrite)
        *readyToWrite = canWrite;
    return canWrite;
}

bool QSocks5SocketEngine::isReadNotificationEnabled() const
{
    Q_D(const QSocks5SocketEngine);
    return d->readNotificationEnabled;
}

void QSocks5SocketEngine::setReadNotificationEnabled(bool enable)
{
    Q_D(QSocks5SocketEngine);

    QSOCKS5_Q_DEBUG << "setReadNotificationEnabled(" << enable << ')';

    bool emitSignal = false;
    if (!d->readNotificationEnabled
        && enable) {
        if (d->mode == QSocks5SocketEnginePrivate::ConnectMode)
            emitSignal = !d->connectData->readBuffer.isEmpty();
#ifndef QT_NO_UDPSOCKET
        else if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode)
            emitSignal = !d->udpData->pendingDatagrams.isEmpty();
#endif
        else if (d->mode == QSocks5SocketEnginePrivate::BindMode
            && d->socketState == QAbstractSocket::ListeningState
            && d->socks5State == QSocks5SocketEnginePrivate::BindSuccess)
            emitSignal = true;
    }

    d->readNotificationEnabled = enable;

    if (emitSignal)
        d->emitReadNotification();
}

bool QSocks5SocketEngine::isWriteNotificationEnabled() const
{
    Q_D(const QSocks5SocketEngine);
    return d->writeNotificationEnabled;
}

void QSocks5SocketEngine::setWriteNotificationEnabled(bool enable)
{
    Q_D(QSocks5SocketEngine);
    d->writeNotificationEnabled = enable;
    if (enable && d->socketState == QAbstractSocket::ConnectedState) {
        if (d->mode == QSocks5SocketEnginePrivate::ConnectMode && d->data->controlSocket->bytesToWrite())
            return; // will be emitted as a result of bytes written
       d->emitWriteNotification();
       d->writeNotificationActivated = false;
    }
}

bool QSocks5SocketEngine::isExceptionNotificationEnabled() const
{
    Q_D(const QSocks5SocketEngine);
    return d->exceptNotificationEnabled;
}

void QSocks5SocketEngine::setExceptionNotificationEnabled(bool enable)
{
    Q_D(QSocks5SocketEngine);
    d->exceptNotificationEnabled = enable;
}

QAbstractSocketEngine *
QSocks5SocketEngineHandler::createSocketEngine(QAbstractSocket::SocketType socketType,
                                               const QNetworkProxy &proxy, QObject *parent)
{
    Q_UNUSED(socketType);

    // proxy type must have been resolved by now
    if (proxy.type() != QNetworkProxy::Socks5Proxy) {
        QSOCKS5_DEBUG << "not proxying";
        return 0;
    }
    QScopedPointer<QSocks5SocketEngine> engine(new QSocks5SocketEngine(parent));
    engine->setProxy(proxy);
    return engine.take();
}

QAbstractSocketEngine *QSocks5SocketEngineHandler::createSocketEngine(int socketDescriptor, QObject *parent)
{
    QSOCKS5_DEBUG << "createSocketEngine" << socketDescriptor;
    if (socks5BindStore()->contains(socketDescriptor)) {
        QSOCKS5_DEBUG << "bind store contains" << socketDescriptor;
        return new QSocks5SocketEngine(parent);
    }
    return 0;
}

#endif // QT_NO_SOCKS5

QT_END_NAMESPACE