summaryrefslogtreecommitdiffstats
path: root/src/network/ssl/qsslsocket.cpp
blob: 591d6351628cf86c7ba3fe99d207819da0b909e6 (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
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2014 BlackBerry Limited. All rights reserved.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/


//#define QSSLSOCKET_DEBUG

/*!
    \class QSslSocket
    \brief The QSslSocket class provides an SSL encrypted socket for both
    clients and servers.
    \since 4.3

    \reentrant
    \ingroup network
    \ingroup ssl
    \inmodule QtNetwork

    QSslSocket establishes a secure, encrypted TCP connection you can
    use for transmitting encrypted data. It can operate in both client
    and server mode, and it supports modern SSL protocols, including
    SSL 3 and TLS 1.2. By default, QSslSocket uses only SSL protocols
    which are considered to be secure (QSsl::SecureProtocols), but you can
    change the SSL protocol by calling setProtocol() as long as you do
    it before the handshake has started.

    SSL encryption operates on top of the existing TCP stream after
    the socket enters the ConnectedState. There are two simple ways to
    establish a secure connection using QSslSocket: With an immediate
    SSL handshake, or with a delayed SSL handshake occurring after the
    connection has been established in unencrypted mode.

    The most common way to use QSslSocket is to construct an object
    and start a secure connection by calling connectToHostEncrypted().
    This method starts an immediate SSL handshake once the connection
    has been established.

    \snippet code/src_network_ssl_qsslsocket.cpp 0

    As with a plain QTcpSocket, QSslSocket enters the HostLookupState,
    ConnectingState, and finally the ConnectedState, if the connection
    is successful. The handshake then starts automatically, and if it
    succeeds, the encrypted() signal is emitted to indicate the socket
    has entered the encrypted state and is ready for use.

    Note that data can be written to the socket immediately after the
    return from connectToHostEncrypted() (i.e., before the encrypted()
    signal is emitted). The data is queued in QSslSocket until after
    the encrypted() signal is emitted.

    An example of using the delayed SSL handshake to secure an
    existing connection is the case where an SSL server secures an
    incoming connection. Suppose you create an SSL server class as a
    subclass of QTcpServer. You would override
    QTcpServer::incomingConnection() with something like the example
    below, which first constructs an instance of QSslSocket and then
    calls setSocketDescriptor() to set the new socket's descriptor to
    the existing one passed in. It then initiates the SSL handshake
    by calling startServerEncryption().

    \snippet code/src_network_ssl_qsslsocket.cpp 1

    If an error occurs, QSslSocket emits the sslErrors() signal. In this
    case, if no action is taken to ignore the error(s), the connection
    is dropped. To continue, despite the occurrence of an error, you
    can call ignoreSslErrors(), either from within this slot after the
    error occurs, or any time after construction of the QSslSocket and
    before the connection is attempted. This will allow QSslSocket to
    ignore the errors it encounters when establishing the identity of
    the peer. Ignoring errors during an SSL handshake should be used
    with caution, since a fundamental characteristic of secure
    connections is that they should be established with a successful
    handshake.

    Once encrypted, you use QSslSocket as a regular QTcpSocket. When
    readyRead() is emitted, you can call read(), canReadLine() and
    readLine(), or getChar() to read decrypted data from QSslSocket's
    internal buffer, and you can call write() or putChar() to write
    data back to the peer. QSslSocket will automatically encrypt the
    written data for you, and emit encryptedBytesWritten() once
    the data has been written to the peer.

    As a convenience, QSslSocket supports QTcpSocket's blocking
    functions waitForConnected(), waitForReadyRead(),
    waitForBytesWritten(), and waitForDisconnected(). It also provides
    waitForEncrypted(), which will block the calling thread until an
    encrypted connection has been established.

    \snippet code/src_network_ssl_qsslsocket.cpp 2

    QSslSocket provides an extensive, easy-to-use API for handling
    cryptographic ciphers, private keys, and local, peer, and
    Certification Authority (CA) certificates. It also provides an API
    for handling errors that occur during the handshake phase.

    The following features can also be customized:

    \list
    \li The socket's cryptographic cipher suite can be customized before
    the handshake phase with setCiphers() and setDefaultCiphers().
    \li The socket's local certificate and private key can be customized
    before the handshake phase with setLocalCertificate() and
    setPrivateKey().
    \li The CA certificate database can be extended and customized with
    addCaCertificate(), addCaCertificates(), addDefaultCaCertificate(),
    addDefaultCaCertificates(), and QSslConfiguration::defaultConfiguration().setCaCertificates().
    \endlist

    \note If available, root certificates on Unix (excluding OS X) will be
    loaded on demand from the standard certificate directories. If you do not
    want to load root certificates on demand, you need to call either
    QSslConfiguration::defaultConfiguration().setCaCertificates() before the first
    SSL handshake is made in your application (for example, via passing
    QSslSocket::systemCaCertificates() to it), or call
    QSslConfiguration::defaultConfiguration()::setCaCertificates() on your QSslSocket instance
    prior to the SSL handshake.

    For more information about ciphers and certificates, refer to QSslCipher and
    QSslCertificate.

    This product includes software developed by the OpenSSL Project
    for use in the OpenSSL Toolkit (\l{http://www.openssl.org/}).

    \note Be aware of the difference between the bytesWritten() signal and
    the encryptedBytesWritten() signal. For a QTcpSocket, bytesWritten()
    will get emitted as soon as data has been written to the TCP socket.
    For a QSslSocket, bytesWritten() will get emitted when the data
    is being encrypted and encryptedBytesWritten()
    will get emitted as soon as data has been written to the TCP socket.

    \sa QSslCertificate, QSslCipher, QSslError
*/

/*!
    \enum QSslSocket::SslMode

    Describes the connection modes available for QSslSocket.

    \value UnencryptedMode The socket is unencrypted. Its
    behavior is identical to QTcpSocket.

    \value SslClientMode The socket is a client-side SSL socket.
    It is either alreayd encrypted, or it is in the SSL handshake
    phase (see QSslSocket::isEncrypted()).

    \value SslServerMode The socket is a server-side SSL socket.
    It is either already encrypted, or it is in the SSL handshake
    phase (see QSslSocket::isEncrypted()).
*/

/*!
    \enum QSslSocket::PeerVerifyMode
    \since 4.4

    Describes the peer verification modes for QSslSocket. The default mode is
    AutoVerifyPeer, which selects an appropriate mode depending on the
    socket's QSocket::SslMode.

    \value VerifyNone QSslSocket will not request a certificate from the
    peer. You can set this mode if you are not interested in the identity of
    the other side of the connection. The connection will still be encrypted,
    and your socket will still send its local certificate to the peer if it's
    requested.

    \value QueryPeer QSslSocket will request a certificate from the peer, but
    does not require this certificate to be valid. This is useful when you
    want to display peer certificate details to the user without affecting the
    actual SSL handshake. This mode is the default for servers.

    \value VerifyPeer QSslSocket will request a certificate from the peer
    during the SSL handshake phase, and requires that this certificate is
    valid. On failure, QSslSocket will emit the QSslSocket::sslErrors()
    signal. This mode is the default for clients.

    \value AutoVerifyPeer QSslSocket will automatically use QueryPeer for
    server sockets and VerifyPeer for client sockets.

    \sa QSslSocket::peerVerifyMode()
*/

/*!
    \fn QSslSocket::encrypted()

    This signal is emitted when QSslSocket enters encrypted mode. After this
    signal has been emitted, QSslSocket::isEncrypted() will return true, and
    all further transmissions on the socket will be encrypted.

    \sa QSslSocket::connectToHostEncrypted(), QSslSocket::isEncrypted()
*/

/*!
    \fn QSslSocket::modeChanged(QSslSocket::SslMode mode)

    This signal is emitted when QSslSocket changes from \l
    QSslSocket::UnencryptedMode to either \l QSslSocket::SslClientMode or \l
    QSslSocket::SslServerMode. \a mode is the new mode.

    \sa QSslSocket::mode()
*/

/*!
    \fn QSslSocket::encryptedBytesWritten(qint64 written)
    \since 4.4

    This signal is emitted when QSslSocket writes its encrypted data to the
    network. The \a written parameter contains the number of bytes that were
    successfully written.

    \sa QIODevice::bytesWritten()
*/

/*!
    \fn void QSslSocket::peerVerifyError(const QSslError &error)
    \since 4.4

    QSslSocket can emit this signal several times during the SSL handshake,
    before encryption has been established, to indicate that an error has
    occurred while establishing the identity of the peer. The \a error is
    usually an indication that QSslSocket is unable to securely identify the
    peer.

    This signal provides you with an early indication when something's wrong.
    By connecting to this signal, you can manually choose to tear down the
    connection from inside the connected slot before the handshake has
    completed. If no action is taken, QSslSocket will proceed to emitting
    QSslSocket::sslErrors().

    \sa sslErrors()
*/

/*!
    \fn void QSslSocket::sslErrors(const QList<QSslError> &errors);

    QSslSocket emits this signal after the SSL handshake to indicate that one
    or more errors have occurred while establishing the identity of the
    peer. The errors are usually an indication that QSslSocket is unable to
    securely identify the peer. Unless any action is taken, the connection
    will be dropped after this signal has been emitted.

    If you want to continue connecting despite the errors that have occurred,
    you must call QSslSocket::ignoreSslErrors() from inside a slot connected to
    this signal. If you need to access the error list at a later point, you
    can call sslErrors() (without arguments).

    \a errors contains one or more errors that prevent QSslSocket from
    verifying the identity of the peer.

    \note You cannot use Qt::QueuedConnection when connecting to this signal,
    or calling QSslSocket::ignoreSslErrors() will have no effect.

    \sa peerVerifyError()
*/

/*!
    \fn void QSslSocket::preSharedKeyAuthenticationRequired(QSslPreSharedKeyAuthenticator *authenticator)
    \since 5.5

    QSslSocket emits this signal when it negotiates a PSK ciphersuite, and
    therefore a PSK authentication is then required.

    When using PSK, the client must send to the server a valid identity and a
    valid pre shared key, in order for the SSL handshake to continue.
    Applications can provide this information in a slot connected to this
    signal, by filling in the passed \a authenticator object according to their
    needs.

    \note Ignoring this signal, or failing to provide the required credentials,
    will cause the handshake to fail, and therefore the connection to be aborted.

    \note The \a authenticator object is owned by the socket and must not be
    deleted by the application.

    \sa QSslPreSharedKeyAuthenticator
*/

#include "qssl_p.h"
#include "qsslsocket.h"
#include "qsslcipher.h"
#ifndef QT_NO_OPENSSL
#include "qsslsocket_openssl_p.h"
#endif
#ifdef Q_OS_WINRT
#include "qsslsocket_winrt_p.h"
#endif
#ifdef QT_SECURETRANSPORT
#include "qsslsocket_mac_p.h"
#endif
#include "qsslconfiguration_p.h"

#include <QtCore/qdebug.h>
#include <QtCore/qdir.h>
#include <QtCore/qmutex.h>
#include <QtCore/qelapsedtimer.h>
#include <QtNetwork/qhostaddress.h>
#include <QtNetwork/qhostinfo.h>

QT_BEGIN_NAMESPACE

class QSslSocketGlobalData
{
public:
    QSslSocketGlobalData() : config(new QSslConfigurationPrivate) {}

    QMutex mutex;
    QList<QSslCipher> supportedCiphers;
    QVector<QSslEllipticCurve> supportedEllipticCurves;
    QExplicitlySharedDataPointer<QSslConfigurationPrivate> config;
};
Q_GLOBAL_STATIC(QSslSocketGlobalData, globalData)

/*!
    Constructs a QSslSocket object. \a parent is passed to QObject's
    constructor. The new socket's \l {QSslCipher} {cipher} suite is
    set to the one returned by the static method defaultCiphers().
*/
QSslSocket::QSslSocket(QObject *parent)
    : QTcpSocket(*new QSslSocketBackendPrivate, parent)
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::QSslSocket(" << parent << "), this =" << (void *)this;
#endif
    d->q_ptr = this;
    d->init();
}

/*!
    Destroys the QSslSocket.
*/
QSslSocket::~QSslSocket()
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::~QSslSocket(), this =" << (void *)this;
#endif
    delete d->plainSocket;
    d->plainSocket = 0;
}

/*!
    \reimp

    \since 5.0

    Continues data transfer on the socket after it has been paused. If
    "setPauseMode(QAbstractSocket::PauseOnSslErrors);" has been called on
    this socket and a sslErrors() signal is received, calling this method
    is necessary for the socket to continue.

    \sa QAbstractSocket::pauseMode(), QAbstractSocket::setPauseMode()
*/
void QSslSocket::resume()
{
    // continuing might emit signals, rather do this through the event loop
    QMetaObject::invokeMethod(this, "_q_resumeImplementation", Qt::QueuedConnection);
}

/*!
    Starts an encrypted connection to the device \a hostName on \a
    port, using \a mode as the \l OpenMode. This is equivalent to
    calling connectToHost() to establish the connection, followed by a
    call to startClientEncryption(). The \a protocol parameter can be
    used to specify which network protocol to use (eg. IPv4 or IPv6).

    QSslSocket first enters the HostLookupState. Then, after entering
    either the event loop or one of the waitFor...() functions, it
    enters the ConnectingState, emits connected(), and then initiates
    the SSL client handshake. At each state change, QSslSocket emits
    signal stateChanged().

    After initiating the SSL client handshake, if the identity of the
    peer can't be established, signal sslErrors() is emitted. If you
    want to ignore the errors and continue connecting, you must call
    ignoreSslErrors(), either from inside a slot function connected to
    the sslErrors() signal, or prior to entering encrypted mode. If
    ignoreSslErrors() is not called, the connection is dropped, signal
    disconnected() is emitted, and QSslSocket returns to the
    UnconnectedState.

    If the SSL handshake is successful, QSslSocket emits encrypted().

    \snippet code/src_network_ssl_qsslsocket.cpp 3

    \note The example above shows that text can be written to
    the socket immediately after requesting the encrypted connection,
    before the encrypted() signal has been emitted. In such cases, the
    text is queued in the object and written to the socket \e after
    the connection is established and the encrypted() signal has been
    emitted.

    The default for \a mode is \l ReadWrite.

    If you want to create a QSslSocket on the server side of a connection, you
    should instead call startServerEncryption() upon receiving the incoming
    connection through QTcpServer.

    \sa connectToHost(), startClientEncryption(), waitForConnected(), waitForEncrypted()
*/
void QSslSocket::connectToHostEncrypted(const QString &hostName, quint16 port, OpenMode mode, NetworkLayerProtocol protocol)
{
    Q_D(QSslSocket);
    if (d->state == ConnectedState || d->state == ConnectingState) {
        qCWarning(lcSsl,
                  "QSslSocket::connectToHostEncrypted() called when already connecting/connected");
        return;
    }

    d->init();
    d->autoStartHandshake = true;
    d->initialized = true;

    // Note: When connecting to localhost, some platforms (e.g., HP-UX and some BSDs)
    // establish the connection immediately (i.e., first attempt).
    connectToHost(hostName, port, mode, protocol);
}

/*!
    \since 4.6
    \overload

    In addition to the original behaviour of connectToHostEncrypted,
    this overloaded method enables the usage of a different hostname
    (\a sslPeerName) for the certificate validation instead of
    the one used for the TCP connection (\a hostName).

    \sa connectToHostEncrypted()
*/
void QSslSocket::connectToHostEncrypted(const QString &hostName, quint16 port,
                                        const QString &sslPeerName, OpenMode mode,
                                        NetworkLayerProtocol protocol)
{
    Q_D(QSslSocket);
    if (d->state == ConnectedState || d->state == ConnectingState) {
        qCWarning(lcSsl,
                  "QSslSocket::connectToHostEncrypted() called when already connecting/connected");
        return;
    }

    d->init();
    d->autoStartHandshake = true;
    d->initialized = true;
    d->verificationPeerName = sslPeerName;

    // Note: When connecting to localhost, some platforms (e.g., HP-UX and some BSDs)
    // establish the connection immediately (i.e., first attempt).
    connectToHost(hostName, port, mode, protocol);
}

/*!
    Initializes QSslSocket with the native socket descriptor \a
    socketDescriptor. Returns \c true if \a socketDescriptor is accepted
    as a valid socket descriptor; otherwise returns \c false.
    The socket is opened in the mode specified by \a openMode, and
    enters the socket state specified by \a state.

    \note It is not possible to initialize two sockets with the same
    native socket descriptor.

    \sa socketDescriptor()
*/
bool QSslSocket::setSocketDescriptor(qintptr socketDescriptor, SocketState state, OpenMode openMode)
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::setSocketDescriptor(" << socketDescriptor << ','
             << state << ',' << openMode << ')';
#endif
    if (!d->plainSocket)
        d->createPlainSocket(openMode);
    bool retVal = d->plainSocket->setSocketDescriptor(socketDescriptor, state, openMode);
    d->cachedSocketDescriptor = d->plainSocket->socketDescriptor();
    d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    setSocketState(state);
    setOpenMode(openMode);
    setLocalPort(d->plainSocket->localPort());
    setLocalAddress(d->plainSocket->localAddress());
    setPeerPort(d->plainSocket->peerPort());
    setPeerAddress(d->plainSocket->peerAddress());
    setPeerName(d->plainSocket->peerName());
    d->readChannelCount = d->plainSocket->readChannelCount();
    d->writeChannelCount = d->plainSocket->writeChannelCount();
    return retVal;
}

/*!
    \since 4.6
    Sets the given \a option to the value described by \a value.

    \sa socketOption()
*/
void QSslSocket::setSocketOption(QAbstractSocket::SocketOption option, const QVariant &value)
{
    Q_D(QSslSocket);
    if (d->plainSocket)
        d->plainSocket->setSocketOption(option, value);
}

/*!
    \since 4.6
    Returns the value of the \a option option.

    \sa setSocketOption()
*/
QVariant QSslSocket::socketOption(QAbstractSocket::SocketOption option)
{
    Q_D(QSslSocket);
    if (d->plainSocket)
        return d->plainSocket->socketOption(option);
    else
        return QVariant();
}

/*!
    Returns the current mode for the socket; either UnencryptedMode, where
    QSslSocket behaves identially to QTcpSocket, or one of SslClientMode or
    SslServerMode, where the client is either negotiating or in encrypted
    mode.

    When the mode changes, QSslSocket emits modeChanged()

    \sa SslMode
*/
QSslSocket::SslMode QSslSocket::mode() const
{
    Q_D(const QSslSocket);
    return d->mode;
}

/*!
    Returns \c true if the socket is encrypted; otherwise, false is returned.

    An encrypted socket encrypts all data that is written by calling write()
    or putChar() before the data is written to the network, and decrypts all
    incoming data as the data is received from the network, before you call
    read(), readLine() or getChar().

    QSslSocket emits encrypted() when it enters encrypted mode.

    You can call sessionCipher() to find which cryptographic cipher is used to
    encrypt and decrypt your data.

    \sa mode()
*/
bool QSslSocket::isEncrypted() const
{
    Q_D(const QSslSocket);
    return d->connectionEncrypted;
}

/*!
    Returns the socket's SSL protocol. By default, \l QSsl::SecureProtocols is used.

    \sa setProtocol()
*/
QSsl::SslProtocol QSslSocket::protocol() const
{
    Q_D(const QSslSocket);
    return d->configuration.protocol;
}

/*!
    Sets the socket's SSL protocol to \a protocol. This will affect the next
    initiated handshake; calling this function on an already-encrypted socket
    will not affect the socket's protocol.
*/
void QSslSocket::setProtocol(QSsl::SslProtocol protocol)
{
    Q_D(QSslSocket);
    d->configuration.protocol = protocol;
}

/*!
    \since 4.4

    Returns the socket's verify mode. This mode decides whether
    QSslSocket should request a certificate from the peer (i.e., the client
    requests a certificate from the server, or a server requesting a
    certificate from the client), and whether it should require that this
    certificate is valid.

    The default mode is AutoVerifyPeer, which tells QSslSocket to use
    VerifyPeer for clients and QueryPeer for servers.

    \sa setPeerVerifyMode(), peerVerifyDepth(), mode()
*/
QSslSocket::PeerVerifyMode QSslSocket::peerVerifyMode() const
{
    Q_D(const QSslSocket);
    return d->configuration.peerVerifyMode;
}

/*!
    \since 4.4

    Sets the socket's verify mode to \a mode. This mode decides whether
    QSslSocket should request a certificate from the peer (i.e., the client
    requests a certificate from the server, or a server requesting a
    certificate from the client), and whether it should require that this
    certificate is valid.

    The default mode is AutoVerifyPeer, which tells QSslSocket to use
    VerifyPeer for clients and QueryPeer for servers.

    Setting this mode after encryption has started has no effect on the
    current connection.

    \sa peerVerifyMode(), setPeerVerifyDepth(), mode()
*/
void QSslSocket::setPeerVerifyMode(QSslSocket::PeerVerifyMode mode)
{
    Q_D(QSslSocket);
    d->configuration.peerVerifyMode = mode;
}

/*!
    \since 4.4

    Returns the maximum number of certificates in the peer's certificate chain
    to be checked during the SSL handshake phase, or 0 (the default) if no
    maximum depth has been set, indicating that the whole certificate chain
    should be checked.

    The certificates are checked in issuing order, starting with the peer's
    own certificate, then its issuer's certificate, and so on.

    \sa setPeerVerifyDepth(), peerVerifyMode()
*/
int QSslSocket::peerVerifyDepth() const
{
    Q_D(const QSslSocket);
    return d->configuration.peerVerifyDepth;
}

/*!
    \since 4.4

    Sets the maximum number of certificates in the peer's certificate chain to
    be checked during the SSL handshake phase, to \a depth. Setting a depth of
    0 means that no maximum depth is set, indicating that the whole
    certificate chain should be checked.

    The certificates are checked in issuing order, starting with the peer's
    own certificate, then its issuer's certificate, and so on.

    \sa peerVerifyDepth(), setPeerVerifyMode()
*/
void QSslSocket::setPeerVerifyDepth(int depth)
{
    Q_D(QSslSocket);
    if (depth < 0) {
        qCWarning(lcSsl, "QSslSocket::setPeerVerifyDepth: cannot set negative depth of %d", depth);
        return;
    }
    d->configuration.peerVerifyDepth = depth;
}

/*!
    \since 4.8

    Returns the different hostname for the certificate validation, as set by
    setPeerVerifyName or by connectToHostEncrypted.

    \sa setPeerVerifyName(), connectToHostEncrypted()
*/
QString QSslSocket::peerVerifyName() const
{
    Q_D(const QSslSocket);
    return d->verificationPeerName;
}

/*!
    \since 4.8

    Sets a different host name, given by \a hostName, for the certificate
    validation instead of the one used for the TCP connection.

    \sa connectToHostEncrypted()
*/
void QSslSocket::setPeerVerifyName(const QString &hostName)
{
    Q_D(QSslSocket);
    d->verificationPeerName = hostName;
}

/*!
    \reimp

    Returns the number of decrypted bytes that are immediately available for
    reading.
*/
qint64 QSslSocket::bytesAvailable() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return QIODevice::bytesAvailable() + (d->plainSocket ? d->plainSocket->bytesAvailable() : 0);
    return QIODevice::bytesAvailable();
}

/*!
    \reimp

    Returns the number of unencrypted bytes that are waiting to be encrypted
    and written to the network.
*/
qint64 QSslSocket::bytesToWrite() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return d->plainSocket ? d->plainSocket->bytesToWrite() : 0;
    return d->writeBuffer.size();
}

/*!
    \since 4.4

    Returns the number of encrypted bytes that are awaiting decryption.
    Normally, this function will return 0 because QSslSocket decrypts its
    incoming data as soon as it can.
*/
qint64 QSslSocket::encryptedBytesAvailable() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return 0;
    return d->plainSocket->bytesAvailable();
}

/*!
    \since 4.4

    Returns the number of encrypted bytes that are waiting to be written to
    the network.
*/
qint64 QSslSocket::encryptedBytesToWrite() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return 0;
    return d->plainSocket->bytesToWrite();
}

/*!
    \reimp

    Returns \c true if you can read one while line (terminated by a single ASCII
    '\\n' character) of decrypted characters; otherwise, false is returned.
*/
bool QSslSocket::canReadLine() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return QIODevice::canReadLine() || (d->plainSocket && d->plainSocket->canReadLine());
    return QIODevice::canReadLine();
}

/*!
    \reimp
*/
void QSslSocket::close()
{
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::close()";
#endif
    Q_D(QSslSocket);
    if (encryptedBytesToWrite() || !d->writeBuffer.isEmpty())
        flush();
    if (d->plainSocket)
        d->plainSocket->close();
    QTcpSocket::close();

    // must be cleared, reading/writing not possible on closed socket:
    d->buffer.clear();
    d->writeBuffer.clear();
}

/*!
    \reimp
*/
bool QSslSocket::atEnd() const
{
    Q_D(const QSslSocket);
    if (d->mode == UnencryptedMode)
        return QIODevice::atEnd() && (!d->plainSocket || d->plainSocket->atEnd());
    return QIODevice::atEnd();
}

/*!
    This function writes as much as possible from the internal write buffer to
    the underlying network socket, without blocking. If any data was written,
    this function returns \c true; otherwise false is returned.

    Call this function if you need QSslSocket to start sending buffered data
    immediately. The number of bytes successfully written depends on the
    operating system. In most cases, you do not need to call this function,
    because QAbstractSocket will start sending data automatically once control
    goes back to the event loop. In the absence of an event loop, call
    waitForBytesWritten() instead.

    \sa write(), waitForBytesWritten()
*/
// Note! docs copied from QAbstractSocket::flush()
bool QSslSocket::flush()
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::flush()";
#endif
    if (d->mode != UnencryptedMode)
        // encrypt any unencrypted bytes in our buffer
        d->transmit();

    return d->plainSocket ? d->plainSocket->flush() : false;
}

/*!
    \since 4.4

    Sets the size of QSslSocket's internal read buffer to be \a size bytes.
*/
void QSslSocket::setReadBufferSize(qint64 size)
{
    Q_D(QSslSocket);
    d->readBufferMaxSize = size;

    if (d->plainSocket)
        d->plainSocket->setReadBufferSize(size);
}

/*!
    Aborts the current connection and resets the socket. Unlike
    disconnectFromHost(), this function immediately closes the socket,
    clearing any pending data in the write buffer.

    \sa disconnectFromHost(), close()
*/
void QSslSocket::abort()
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::abort()";
#endif
    if (d->plainSocket)
        d->plainSocket->abort();
    close();
}

/*!
    \since 4.4

    Returns the socket's SSL configuration state. The default SSL
    configuration of a socket is to use the default ciphers,
    default CA certificates, no local private key or certificate.

    The SSL configuration also contains fields that can change with
    time without notice.

    \sa localCertificate(), peerCertificate(), peerCertificateChain(),
        sessionCipher(), privateKey(), ciphers(), caCertificates()
*/
QSslConfiguration QSslSocket::sslConfiguration() const
{
    Q_D(const QSslSocket);

    // create a deep copy of our configuration
    QSslConfigurationPrivate *copy = new QSslConfigurationPrivate(d->configuration);
    copy->ref.store(0);              // the QSslConfiguration constructor refs up
    copy->sessionCipher = d->sessionCipher();
    copy->sessionProtocol = d->sessionProtocol();

    return QSslConfiguration(copy);
}

/*!
    \since 4.4

    Sets the socket's SSL configuration to be the contents of \a configuration.
    This function sets the local certificate, the ciphers, the private key and the CA
    certificates to those stored in \a configuration.

    It is not possible to set the SSL-state related fields.

    \sa setLocalCertificate(), setPrivateKey(), setCaCertificates(), setCiphers()
*/
void QSslSocket::setSslConfiguration(const QSslConfiguration &configuration)
{
    Q_D(QSslSocket);
    d->configuration.localCertificateChain = configuration.localCertificateChain();
    d->configuration.privateKey = configuration.privateKey();
    d->configuration.ciphers = configuration.ciphers();
    d->configuration.ellipticCurves = configuration.ellipticCurves();
    d->configuration.caCertificates = configuration.caCertificates();
    d->configuration.peerVerifyDepth = configuration.peerVerifyDepth();
    d->configuration.peerVerifyMode = configuration.peerVerifyMode();
    d->configuration.protocol = configuration.protocol();
    d->configuration.sslOptions = configuration.d->sslOptions;
    d->configuration.sslSession = configuration.sessionTicket();
    d->configuration.sslSessionTicketLifeTimeHint = configuration.sessionTicketLifeTimeHint();
    d->configuration.nextAllowedProtocols = configuration.allowedNextProtocols();
    d->configuration.nextNegotiatedProtocol = configuration.nextNegotiatedProtocol();
    d->configuration.nextProtocolNegotiationStatus = configuration.nextProtocolNegotiationStatus();

    // if the CA certificates were set explicitly (either via
    // QSslConfiguration::setCaCertificates() or QSslSocket::setCaCertificates(),
    // we cannot load the certificates on demand
    if (!configuration.d->allowRootCertOnDemandLoading)
        d->allowRootCertOnDemandLoading = false;
}

/*!
    Sets the certificate chain to be presented to the peer during the
    SSL handshake to be \a localChain.

    \sa QSslConfiguration::setLocalCertificateChain()
    \since 5.1
 */
void QSslSocket::setLocalCertificateChain(const QList<QSslCertificate> &localChain)
{
    Q_D(QSslSocket);
    d->configuration.localCertificateChain = localChain;
}

/*!
    Returns the socket's local \l {QSslCertificate} {certificate} chain,
    or an empty list if no local certificates have been assigned.

    \sa setLocalCertificateChain()
    \since 5.1
*/
QList<QSslCertificate> QSslSocket::localCertificateChain() const
{
    Q_D(const QSslSocket);
    return d->configuration.localCertificateChain;
}

/*!
    Sets the socket's local certificate to \a certificate. The local
    certificate is necessary if you need to confirm your identity to the
    peer. It is used together with the private key; if you set the local
    certificate, you must also set the private key.

    The local certificate and private key are always necessary for server
    sockets, but are also rarely used by client sockets if the server requires
    the client to authenticate.

    \sa localCertificate(), setPrivateKey()
*/
void QSslSocket::setLocalCertificate(const QSslCertificate &certificate)
{
    Q_D(QSslSocket);
    d->configuration.localCertificateChain = QList<QSslCertificate>();
    d->configuration.localCertificateChain += certificate;
}

/*!
    \overload

    Sets the socket's local \l {QSslCertificate} {certificate} to the
    first one found in file \a path, which is parsed according to the
    specified \a format.
*/
void QSslSocket::setLocalCertificate(const QString &path,
                                     QSsl::EncodingFormat format)
{
    QFile file(path);
    if (file.open(QIODevice::ReadOnly | QIODevice::Text))
        setLocalCertificate(QSslCertificate(file.readAll(), format));

}

/*!
    Returns the socket's local \l {QSslCertificate} {certificate}, or
    an empty certificate if no local certificate has been assigned.

    \sa setLocalCertificate(), privateKey()
*/
QSslCertificate QSslSocket::localCertificate() const
{
    Q_D(const QSslSocket);
    if (d->configuration.localCertificateChain.isEmpty())
        return QSslCertificate();
    return d->configuration.localCertificateChain[0];
}

/*!
    Returns the peer's digital certificate (i.e., the immediate
    certificate of the host you are connected to), or a null
    certificate, if the peer has not assigned a certificate.

    The peer certificate is checked automatically during the
    handshake phase, so this function is normally used to fetch
    the certificate for display or for connection diagnostic
    purposes. It contains information about the peer, including
    its host name, the certificate issuer, and the peer's public
    key.

    Because the peer certificate is set during the handshake phase, it
    is safe to access the peer certificate from a slot connected to
    the sslErrors() signal or the encrypted() signal.

    If a null certificate is returned, it can mean the SSL handshake
    failed, or it can mean the host you are connected to doesn't have
    a certificate, or it can mean there is no connection.

    If you want to check the peer's complete chain of certificates,
    use peerCertificateChain() to get them all at once.

    \sa peerCertificateChain()
*/
QSslCertificate QSslSocket::peerCertificate() const
{
    Q_D(const QSslSocket);
    return d->configuration.peerCertificate;
}

/*!
    Returns the peer's chain of digital certificates, or an empty list
    of certificates.

    Peer certificates are checked automatically during the handshake
    phase. This function is normally used to fetch certificates for
    display, or for performing connection diagnostics. Certificates
    contain information about the peer and the certificate issuers,
    including host name, issuer names, and issuer public keys.

    The peer certificates are set in QSslSocket during the handshake
    phase, so it is safe to call this function from a slot connected
    to the sslErrors() signal or the encrypted() signal.

    If an empty list is returned, it can mean the SSL handshake
    failed, or it can mean the host you are connected to doesn't have
    a certificate, or it can mean there is no connection.

    If you want to get only the peer's immediate certificate, use
    peerCertificate().

    \sa peerCertificate()
*/
QList<QSslCertificate> QSslSocket::peerCertificateChain() const
{
    Q_D(const QSslSocket);
    return d->configuration.peerCertificateChain;
}

/*!
    Returns the socket's cryptographic \l {QSslCipher} {cipher}, or a
    null cipher if the connection isn't encrypted. The socket's cipher
    for the session is set during the handshake phase. The cipher is
    used to encrypt and decrypt data transmitted through the socket.

    QSslSocket also provides functions for setting the ordered list of
    ciphers from which the handshake phase will eventually select the
    session cipher. This ordered list must be in place before the
    handshake phase begins.

    \sa ciphers(), setCiphers(), setDefaultCiphers(), defaultCiphers(),
    supportedCiphers()
*/
QSslCipher QSslSocket::sessionCipher() const
{
    Q_D(const QSslSocket);
    return d->sessionCipher();
}

/*!
    Returns the socket's SSL/TLS protocol or UnknownProtocol if the
    connection isn't encrypted. The socket's protocol for the session
    is set during the handshake phase.

    \sa protocol(), setProtocol()
    \since 5.4
*/
QSsl::SslProtocol QSslSocket::sessionProtocol() const
{
    Q_D(const QSslSocket);
    return d->sessionProtocol();
}


/*!
    Sets the socket's private \l {QSslKey} {key} to \a key. The
    private key and the local \l {QSslCertificate} {certificate} are
    used by clients and servers that must prove their identity to
    SSL peers.

    Both the key and the local certificate are required if you are
    creating an SSL server socket. If you are creating an SSL client
    socket, the key and local certificate are required if your client
    must identify itself to an SSL server.

    \sa privateKey(), setLocalCertificate()
*/
void QSslSocket::setPrivateKey(const QSslKey &key)
{
    Q_D(QSslSocket);
    d->configuration.privateKey = key;
}

/*!
    \overload

    Reads the string in file \a fileName and decodes it using
    a specified \a algorithm and encoding \a format to construct
    an \l {QSslKey} {SSL key}. If the encoded key is encrypted,
    \a passPhrase is used to decrypt it.

    The socket's private key is set to the constructed key. The
    private key and the local \l {QSslCertificate} {certificate} are
    used by clients and servers that must prove their identity to SSL
    peers.

    Both the key and the local certificate are required if you are
    creating an SSL server socket. If you are creating an SSL client
    socket, the key and local certificate are required if your client
    must identify itself to an SSL server.

    \sa privateKey(), setLocalCertificate()
*/
void QSslSocket::setPrivateKey(const QString &fileName, QSsl::KeyAlgorithm algorithm,
                               QSsl::EncodingFormat format, const QByteArray &passPhrase)
{
    Q_D(QSslSocket);
    QFile file(fileName);
    if (file.open(QIODevice::ReadOnly)) {
        d->configuration.privateKey = QSslKey(file.readAll(), algorithm,
                                              format, QSsl::PrivateKey, passPhrase);
    }
}

/*!
    Returns this socket's private key.

    \sa setPrivateKey(), localCertificate()
*/
QSslKey QSslSocket::privateKey() const
{
    Q_D(const QSslSocket);
    return d->configuration.privateKey;
}

/*!
    \deprecated

    Use QSslConfiguration::ciphers() instead.

    Returns this socket's current cryptographic cipher suite. This
    list is used during the socket's handshake phase for choosing a
    session cipher. The returned list of ciphers is ordered by
    descending preference. (i.e., the first cipher in the list is the
    most preferred cipher). The session cipher will be the first one
    in the list that is also supported by the peer.

    By default, the handshake phase can choose any of the ciphers
    supported by this system's SSL libraries, which may vary from
    system to system. The list of ciphers supported by this system's
    SSL libraries is returned by supportedCiphers(). You can restrict
    the list of ciphers used for choosing the session cipher for this
    socket by calling setCiphers() with a subset of the supported
    ciphers. You can revert to using the entire set by calling
    setCiphers() with the list returned by supportedCiphers().

    You can restrict the list of ciphers used for choosing the session
    cipher for \e all sockets by calling setDefaultCiphers() with a
    subset of the supported ciphers. You can revert to using the
    entire set by calling setCiphers() with the list returned by
    supportedCiphers().

    \sa setCiphers(), defaultCiphers(), setDefaultCiphers(), supportedCiphers()
*/
QList<QSslCipher> QSslSocket::ciphers() const
{
    Q_D(const QSslSocket);
    return d->configuration.ciphers;
}

/*!
    \deprecated

    USe QSslConfiguration::setCiphers() instead.

    Sets the cryptographic cipher suite for this socket to \a ciphers,
    which must contain a subset of the ciphers in the list returned by
    supportedCiphers().

    Restricting the cipher suite must be done before the handshake
    phase, where the session cipher is chosen.

    \sa ciphers(), setDefaultCiphers(), supportedCiphers()
*/
void QSslSocket::setCiphers(const QList<QSslCipher> &ciphers)
{
    Q_D(QSslSocket);
    d->configuration.ciphers = ciphers;
}

/*!
    \deprecated

    Use QSslConfiguration::setCiphers() instead.

    Sets the cryptographic cipher suite for this socket to \a ciphers, which
    is a colon-separated list of cipher suite names. The ciphers are listed in
    order of preference, starting with the most preferred cipher. For example:

    \snippet code/src_network_ssl_qsslsocket.cpp 4

    Each cipher name in \a ciphers must be the name of a cipher in the
    list returned by supportedCiphers().  Restricting the cipher suite
    must be done before the handshake phase, where the session cipher
    is chosen.

    \sa ciphers(), setDefaultCiphers(), supportedCiphers()
*/
void QSslSocket::setCiphers(const QString &ciphers)
{
    Q_D(QSslSocket);
    d->configuration.ciphers.clear();
    const auto cipherNames = ciphers.split(QLatin1Char(':'), QString::SkipEmptyParts);
    for (const QString &cipherName : cipherNames) {
        QSslCipher cipher(cipherName);
        if (!cipher.isNull())
            d->configuration.ciphers << cipher;
    }
}

/*!
    \deprecated

    Use QSslConfiguration::setCiphers() on the default QSslConfiguration instead.

    Sets the default cryptographic cipher suite for all sockets in
    this application to \a ciphers, which must contain a subset of the
    ciphers in the list returned by supportedCiphers().

    Restricting the default cipher suite only affects SSL sockets
    that perform their handshake phase after the default cipher
    suite has been changed.

    \sa setCiphers(), defaultCiphers(), supportedCiphers()
*/
void QSslSocket::setDefaultCiphers(const QList<QSslCipher> &ciphers)
{
    QSslSocketPrivate::setDefaultCiphers(ciphers);
}

/*!
    \deprecated

    Use QSslConfiguration::ciphers() on the default QSslConfiguration instead.

    Returns the default cryptographic cipher suite for all sockets in
    this application. This list is used during the socket's handshake
    phase when negotiating with the peer to choose a session cipher.
    The list is ordered by preference (i.e., the first cipher in the
    list is the most preferred cipher).

    By default, the handshake phase can choose any of the ciphers
    supported by this system's SSL libraries, which may vary from
    system to system. The list of ciphers supported by this system's
    SSL libraries is returned by supportedCiphers().

    \sa supportedCiphers()
*/
QList<QSslCipher> QSslSocket::defaultCiphers()
{
    return QSslSocketPrivate::defaultCiphers();
}

/*!
    \deprecated

    Use QSslConfiguration::supportedCiphers() instead.

    Returns the list of cryptographic ciphers supported by this
    system. This list is set by the system's SSL libraries and may
    vary from system to system.

    \sa defaultCiphers(), ciphers(), setCiphers()
*/
QList<QSslCipher> QSslSocket::supportedCiphers()
{
    return QSslSocketPrivate::supportedCiphers();
}

/*!
  Searches all files in the \a path for certificates encoded in the
  specified \a format and adds them to this socket's CA certificate
  database. \a path must be a file or a pattern matching one or more
  files, as specified by \a syntax. Returns \c true if one or more
  certificates are added to the socket's CA certificate database;
  otherwise returns \c false.

  The CA certificate database is used by the socket during the
  handshake phase to validate the peer's certificate.

  For more precise control, use addCaCertificate().

  \sa addCaCertificate(), QSslCertificate::fromPath()
*/
bool QSslSocket::addCaCertificates(const QString &path, QSsl::EncodingFormat format,
                                   QRegExp::PatternSyntax syntax)
{
    Q_D(QSslSocket);
    QList<QSslCertificate> certs = QSslCertificate::fromPath(path, format, syntax);
    if (certs.isEmpty())
        return false;

    d->configuration.caCertificates += certs;
    return true;
}

/*!
  Adds the \a certificate to this socket's CA certificate database.
  The CA certificate database is used by the socket during the
  handshake phase to validate the peer's certificate.

  To add multiple certificates, use addCaCertificates().

  \sa caCertificates(), setCaCertificates()
*/
void QSslSocket::addCaCertificate(const QSslCertificate &certificate)
{
    Q_D(QSslSocket);
    d->configuration.caCertificates += certificate;
}

/*!
  Adds the \a certificates to this socket's CA certificate database.
  The CA certificate database is used by the socket during the
  handshake phase to validate the peer's certificate.

  For more precise control, use addCaCertificate().

  \sa caCertificates(), addDefaultCaCertificate()
*/
void QSslSocket::addCaCertificates(const QList<QSslCertificate> &certificates)
{
    Q_D(QSslSocket);
    d->configuration.caCertificates += certificates;
}

/*!
  \deprecated

  Use QSslConfiguration::setCaCertificates() instead.

  Sets this socket's CA certificate database to be \a certificates.
  The certificate database must be set prior to the SSL handshake.
  The CA certificate database is used by the socket during the
  handshake phase to validate the peer's certificate.

  The CA certificate database can be reset to the current default CA
  certificate database by calling this function with the list of CA
  certificates returned by defaultCaCertificates().

  \sa defaultCaCertificates()
*/
void QSslSocket::setCaCertificates(const QList<QSslCertificate> &certificates)
{
    Q_D(QSslSocket);
    d->configuration.caCertificates = certificates;
    d->allowRootCertOnDemandLoading = false;
}

/*!
  \deprecated

  Use QSslConfiguration::caCertificates() instead.

  Returns this socket's CA certificate database. The CA certificate
  database is used by the socket during the handshake phase to
  validate the peer's certificate. It can be moodified prior to the
  handshake with addCaCertificate(), addCaCertificates(), and
  setCaCertificates().

  \note On Unix, this method may return an empty list if the root
  certificates are loaded on demand.

  \sa addCaCertificate(), addCaCertificates(), setCaCertificates()
*/
QList<QSslCertificate> QSslSocket::caCertificates() const
{
    Q_D(const QSslSocket);
    return d->configuration.caCertificates;
}

/*!
    Searches all files in the \a path for certificates with the
    specified \a encoding and adds them to the default CA certificate
    database. \a path can be an explicit file, or it can contain
    wildcards in the format specified by \a syntax. Returns \c true if
    any CA certificates are added to the default database.

    Each SSL socket's CA certificate database is initialized to the
    default CA certificate database.

    \sa defaultCaCertificates(), addCaCertificates(), addDefaultCaCertificate()
*/
bool QSslSocket::addDefaultCaCertificates(const QString &path, QSsl::EncodingFormat encoding,
                                          QRegExp::PatternSyntax syntax)
{
    return QSslSocketPrivate::addDefaultCaCertificates(path, encoding, syntax);
}

/*!
    Adds \a certificate to the default CA certificate database.  Each
    SSL socket's CA certificate database is initialized to the default
    CA certificate database.

    \sa defaultCaCertificates(), addCaCertificates()
*/
void QSslSocket::addDefaultCaCertificate(const QSslCertificate &certificate)
{
    QSslSocketPrivate::addDefaultCaCertificate(certificate);
}

/*!
    Adds \a certificates to the default CA certificate database.  Each
    SSL socket's CA certificate database is initialized to the default
    CA certificate database.

    \sa defaultCaCertificates(), addCaCertificates()
*/
void QSslSocket::addDefaultCaCertificates(const QList<QSslCertificate> &certificates)
{
    QSslSocketPrivate::addDefaultCaCertificates(certificates);
}

/*!
    \deprecated

    Use QSslConfiguration::setCaCertificates() on the default QSslConfiguration instead.

    Sets the default CA certificate database to \a certificates. The
    default CA certificate database is originally set to your system's
    default CA certificate database. You can override the default CA
    certificate database with your own CA certificate database using
    this function.

    Each SSL socket's CA certificate database is initialized to the
    default CA certificate database.

    \sa addDefaultCaCertificate()
*/
void QSslSocket::setDefaultCaCertificates(const QList<QSslCertificate> &certificates)
{
    QSslSocketPrivate::setDefaultCaCertificates(certificates);
}

/*!
    \deprecated

    Use QSslConfiguration::caCertificates() on the default QSslConfiguration instead.

    Returns the current default CA certificate database. This database
    is originally set to your system's default CA certificate database.
    If no system default database is found, an empty database will be
    returned. You can override the default CA certificate database
    with your own CA certificate database using setDefaultCaCertificates().

    Each SSL socket's CA certificate database is initialized to the
    default CA certificate database.

    \note On Unix, this method may return an empty list if the root
    certificates are loaded on demand.

    \sa caCertificates()
*/
QList<QSslCertificate> QSslSocket::defaultCaCertificates()
{
    return QSslSocketPrivate::defaultCaCertificates();
}

/*!
    \deprecated

    Use QSslConfiguration::systemDefaultCaCertificates instead.

    This function provides the CA certificate database
    provided by the operating system. The CA certificate database
    returned by this function is used to initialize the database
    returned by defaultCaCertificates(). You can replace that database
    with your own with setDefaultCaCertificates().

    \note: On OS X, only certificates that are either trusted for all
    purposes or trusted for the purpose of SSL in the keychain will be
    returned.

    \sa caCertificates(), defaultCaCertificates(), setDefaultCaCertificates()
*/
QList<QSslCertificate> QSslSocket::systemCaCertificates()
{
    // we are calling ensureInitialized() in the method below
    return QSslSocketPrivate::systemCaCertificates();
}

/*!
    Waits until the socket is connected, or \a msecs milliseconds,
    whichever happens first. If the connection has been established,
    this function returns \c true; otherwise it returns \c false.

    \sa QAbstractSocket::waitForConnected()
*/
bool QSslSocket::waitForConnected(int msecs)
{
    Q_D(QSslSocket);
    if (!d->plainSocket)
        return false;
    bool retVal = d->plainSocket->waitForConnected(msecs);
    if (!retVal) {
        setSocketState(d->plainSocket->state());
        d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    }
    return retVal;
}

/*!
    Waits until the socket has completed the SSL handshake and has
    emitted encrypted(), or \a msecs milliseconds, whichever comes
    first. If encrypted() has been emitted, this function returns
    true; otherwise (e.g., the socket is disconnected, or the SSL
    handshake fails), false is returned.

    The following example waits up to one second for the socket to be
    encrypted:

    \snippet code/src_network_ssl_qsslsocket.cpp 5

    If msecs is -1, this function will not time out.

    \sa startClientEncryption(), startServerEncryption(), encrypted(), isEncrypted()
*/
bool QSslSocket::waitForEncrypted(int msecs)
{
    Q_D(QSslSocket);
    if (!d->plainSocket || d->connectionEncrypted)
        return false;
    if (d->mode == UnencryptedMode && !d->autoStartHandshake)
        return false;

    QElapsedTimer stopWatch;
    stopWatch.start();

    if (d->plainSocket->state() != QAbstractSocket::ConnectedState) {
        // Wait until we've entered connected state.
        if (!d->plainSocket->waitForConnected(msecs))
            return false;
    }

    while (!d->connectionEncrypted) {
        // Start the handshake, if this hasn't been started yet.
        if (d->mode == UnencryptedMode)
            startClientEncryption();
        // Loop, waiting until the connection has been encrypted or an error
        // occurs.
        if (!d->plainSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed())))
            return false;
    }
    return d->connectionEncrypted;
}

/*!
    \reimp
*/
bool QSslSocket::waitForReadyRead(int msecs)
{
    Q_D(QSslSocket);
    if (!d->plainSocket)
        return false;
    if (d->mode == UnencryptedMode && !d->autoStartHandshake)
        return d->plainSocket->waitForReadyRead(msecs);

    // This function must return true if and only if readyRead() *was* emitted.
    // So we initialize "readyReadEmitted" to false and check if it was set to true.
    // waitForReadyRead() could be called recursively, so we can't use the same variable
    // (the inner waitForReadyRead() may fail, but the outer one still succeeded)
    bool readyReadEmitted = false;
    bool *previousReadyReadEmittedPointer = d->readyReadEmittedPointer;
    d->readyReadEmittedPointer = &readyReadEmitted;

    QElapsedTimer stopWatch;
    stopWatch.start();

    if (!d->connectionEncrypted) {
        // Wait until we've entered encrypted mode, or until a failure occurs.
        if (!waitForEncrypted(msecs)) {
            d->readyReadEmittedPointer = previousReadyReadEmittedPointer;
            return false;
        }
    }

    if (!d->writeBuffer.isEmpty()) {
        // empty our cleartext write buffer first
        d->transmit();
    }

    // test readyReadEmitted first because either operation above
    // (waitForEncrypted or transmit) may have set it
    while (!readyReadEmitted &&
           d->plainSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
    }

    d->readyReadEmittedPointer = previousReadyReadEmittedPointer;
    return readyReadEmitted;
}

/*!
    \reimp
*/
bool QSslSocket::waitForBytesWritten(int msecs)
{
    Q_D(QSslSocket);
    if (!d->plainSocket)
        return false;
    if (d->mode == UnencryptedMode)
        return d->plainSocket->waitForBytesWritten(msecs);

    QElapsedTimer stopWatch;
    stopWatch.start();

    if (!d->connectionEncrypted) {
        // Wait until we've entered encrypted mode, or until a failure occurs.
        if (!waitForEncrypted(msecs))
            return false;
    }
    if (!d->writeBuffer.isEmpty()) {
        // empty our cleartext write buffer first
        d->transmit();
    }

    return d->plainSocket->waitForBytesWritten(qt_subtract_from_timeout(msecs, stopWatch.elapsed()));
}

/*!
    Waits until the socket has disconnected or \a msecs milliseconds,
    whichever comes first. If the connection has been disconnected,
    this function returns \c true; otherwise it returns \c false.

    \sa QAbstractSocket::waitForDisconnected()
*/
bool QSslSocket::waitForDisconnected(int msecs)
{
    Q_D(QSslSocket);

    // require calling connectToHost() before waitForDisconnected()
    if (state() == UnconnectedState) {
        qCWarning(lcSsl, "QSslSocket::waitForDisconnected() is not allowed in UnconnectedState");
        return false;
    }

    if (!d->plainSocket)
        return false;
    if (d->mode == UnencryptedMode)
        return d->plainSocket->waitForDisconnected(msecs);

    QElapsedTimer stopWatch;
    stopWatch.start();

    if (!d->connectionEncrypted) {
        // Wait until we've entered encrypted mode, or until a failure occurs.
        if (!waitForEncrypted(msecs))
            return false;
    }
    bool retVal = d->plainSocket->waitForDisconnected(qt_subtract_from_timeout(msecs, stopWatch.elapsed()));
    if (!retVal) {
        setSocketState(d->plainSocket->state());
        d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    }
    return retVal;
}

/*!
    Returns a list of the last SSL errors that occurred. This is the
    same list as QSslSocket passes via the sslErrors() signal. If the
    connection has been encrypted with no errors, this function will
    return an empty list.

    \sa connectToHostEncrypted()
*/
QList<QSslError> QSslSocket::sslErrors() const
{
    Q_D(const QSslSocket);
    return d->sslErrors;
}

/*!
    Returns \c true if this platform supports SSL; otherwise, returns
    false. If the platform doesn't support SSL, the socket will fail
    in the connection phase.
*/
bool QSslSocket::supportsSsl()
{
    return QSslSocketPrivate::supportsSsl();
}

/*!
    \since 5.0
    Returns the version number of the SSL library in use. Note that
    this is the version of the library in use at run-time not compile
    time. If no SSL support is available then this will return an
    undefined value.
*/
long QSslSocket::sslLibraryVersionNumber()
{
    return QSslSocketPrivate::sslLibraryVersionNumber();
}

/*!
    \since 5.0
    Returns the version string of the SSL library in use. Note that
    this is the version of the library in use at run-time not compile
    time. If no SSL support is available then this will return an empty value.
*/
QString QSslSocket::sslLibraryVersionString()
{
    return QSslSocketPrivate::sslLibraryVersionString();
}

/*!
    \since 5.4
    Returns the version number of the SSL library in use at compile
    time. If no SSL support is available then this will return an
    undefined value.

    \sa sslLibraryVersionNumber()
*/
long QSslSocket::sslLibraryBuildVersionNumber()
{
    return QSslSocketPrivate::sslLibraryBuildVersionNumber();
}

/*!
    \since 5.4
    Returns the version string of the SSL library in use at compile
    time. If no SSL support is available then this will return an
    empty value.

    \sa sslLibraryVersionString()
*/
QString QSslSocket::sslLibraryBuildVersionString()
{
    return QSslSocketPrivate::sslLibraryBuildVersionString();
}

/*!
    Starts a delayed SSL handshake for a client connection. This
    function can be called when the socket is in the \l ConnectedState
    but still in the \l UnencryptedMode. If it is not yet connected,
    or if it is already encrypted, this function has no effect.

    Clients that implement STARTTLS functionality often make use of
    delayed SSL handshakes. Most other clients can avoid calling this
    function directly by using connectToHostEncrypted() instead, which
    automatically performs the handshake.

    \sa connectToHostEncrypted(), startServerEncryption()
*/
void QSslSocket::startClientEncryption()
{
    Q_D(QSslSocket);
    if (d->mode != UnencryptedMode) {
        qCWarning(lcSsl,
                  "QSslSocket::startClientEncryption: cannot start handshake on non-plain connection");
        return;
    }
    if (state() != ConnectedState) {
        qCWarning(lcSsl,
                  "QSslSocket::startClientEncryption: cannot start handshake when not connected");
        return;
    }
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::startClientEncryption()";
#endif
    d->mode = SslClientMode;
    emit modeChanged(d->mode);
    d->startClientEncryption();
}

/*!
    Starts a delayed SSL handshake for a server connection. This
    function can be called when the socket is in the \l ConnectedState
    but still in \l UnencryptedMode. If it is not connected or it is
    already encrypted, the function has no effect.

    For server sockets, calling this function is the only way to
    initiate the SSL handshake. Most servers will call this function
    immediately upon receiving a connection, or as a result of having
    received a protocol-specific command to enter SSL mode (e.g, the
    server may respond to receiving the string "STARTTLS\\r\\n" by
    calling this function).

    The most common way to implement an SSL server is to create a
    subclass of QTcpServer and reimplement
    QTcpServer::incomingConnection(). The returned socket descriptor
    is then passed to QSslSocket::setSocketDescriptor().

    \sa connectToHostEncrypted(), startClientEncryption()
*/
void QSslSocket::startServerEncryption()
{
    Q_D(QSslSocket);
    if (d->mode != UnencryptedMode) {
        qCWarning(lcSsl, "QSslSocket::startServerEncryption: cannot start handshake on non-plain connection");
        return;
    }
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::startServerEncryption()";
#endif
    d->mode = SslServerMode;
    emit modeChanged(d->mode);
    d->startServerEncryption();
}

/*!
    This slot tells QSslSocket to ignore errors during QSslSocket's
    handshake phase and continue connecting. If you want to continue
    with the connection even if errors occur during the handshake
    phase, then you must call this slot, either from a slot connected
    to sslErrors(), or before the handshake phase. If you don't call
    this slot, either in response to errors or before the handshake,
    the connection will be dropped after the sslErrors() signal has
    been emitted.

    If there are no errors during the SSL handshake phase (i.e., the
    identity of the peer is established with no problems), QSslSocket
    will not emit the sslErrors() signal, and it is unnecessary to
    call this function.

    \warning Be sure to always let the user inspect the errors
    reported by the sslErrors() signal, and only call this method
    upon confirmation from the user that proceeding is ok.
    If there are unexpected errors, the connection should be aborted.
    Calling this method without inspecting the actual errors will
    most likely pose a security risk for your application. Use it
    with great care!

    \sa sslErrors()
*/
void QSslSocket::ignoreSslErrors()
{
    Q_D(QSslSocket);
    d->ignoreAllSslErrors = true;
}

/*!
    \overload
    \since 4.6

    This method tells QSslSocket to ignore only the errors given in \a
    errors.

    \note Because most SSL errors are associated with a certificate, for most
    of them you must set the expected certificate this SSL error is related to.
    If, for instance, you want to connect to a server that uses
    a self-signed certificate, consider the following snippet:

    \snippet code/src_network_ssl_qsslsocket.cpp 6

    Multiple calls to this function will replace the list of errors that
    were passed in previous calls.
    You can clear the list of errors you want to ignore by calling this
    function with an empty list.

    \sa sslErrors()
*/
void QSslSocket::ignoreSslErrors(const QList<QSslError> &errors)
{
    Q_D(QSslSocket);
    d->ignoreErrorsList = errors;
}

/*!
    \internal
*/
void QSslSocket::connectToHost(const QString &hostName, quint16 port, OpenMode openMode, NetworkLayerProtocol protocol)
{
    Q_D(QSslSocket);
    d->preferredNetworkLayerProtocol = protocol;
    if (!d->initialized)
        d->init();
    d->initialized = false;

#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::connectToHost("
             << hostName << ',' << port << ',' << openMode << ')';
#endif
    if (!d->plainSocket) {
#ifdef QSSLSOCKET_DEBUG
        qCDebug(lcSsl) << "\tcreating internal plain socket";
#endif
        d->createPlainSocket(openMode);
    }
#ifndef QT_NO_NETWORKPROXY
    d->plainSocket->setProxy(proxy());
#endif
    QIODevice::open(openMode);
    d->readChannelCount = d->writeChannelCount = 0;
    d->plainSocket->connectToHost(hostName, port, openMode, d->preferredNetworkLayerProtocol);
    d->cachedSocketDescriptor = d->plainSocket->socketDescriptor();
}

/*!
    \internal
*/
void QSslSocket::disconnectFromHost()
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::disconnectFromHost()";
#endif
    if (!d->plainSocket)
        return;
    if (d->state == UnconnectedState)
        return;
    if (d->mode == UnencryptedMode && !d->autoStartHandshake) {
        d->plainSocket->disconnectFromHost();
        return;
    }
    if (d->state <= ConnectingState) {
        d->pendingClose = true;
        return;
    }

    // Perhaps emit closing()
    if (d->state != ClosingState) {
        d->state = ClosingState;
        emit stateChanged(d->state);
    }

    if (!d->writeBuffer.isEmpty()) {
        d->pendingClose = true;
        return;
    }

    if (d->mode == UnencryptedMode) {
        d->plainSocket->disconnectFromHost();
    } else {
        d->disconnectFromHost();
    }
}

/*!
    \reimp
*/
qint64 QSslSocket::readData(char *data, qint64 maxlen)
{
    Q_D(QSslSocket);
    qint64 readBytes = 0;

    if (d->mode == UnencryptedMode && !d->autoStartHandshake) {
        readBytes = d->plainSocket->read(data, maxlen);
#ifdef QSSLSOCKET_DEBUG
        qCDebug(lcSsl) << "QSslSocket::readData(" << (void *)data << ',' << maxlen << ") =="
                 << readBytes;
#endif
    } else {
        // possibly trigger another transmit() to decrypt more data from the socket
        if (d->plainSocket->bytesAvailable())
            QMetaObject::invokeMethod(this, "_q_flushReadBuffer", Qt::QueuedConnection);
    }

    return readBytes;
}

/*!
    \reimp
*/
qint64 QSslSocket::writeData(const char *data, qint64 len)
{
    Q_D(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::writeData(" << (void *)data << ',' << len << ')';
#endif
    if (d->mode == UnencryptedMode && !d->autoStartHandshake)
        return d->plainSocket->write(data, len);

    d->writeBuffer.append(data, len);

    // make sure we flush to the plain socket's buffer
    QMetaObject::invokeMethod(this, "_q_flushWriteBuffer", Qt::QueuedConnection);

    return len;
}

/*!
    \internal
*/
QSslSocketPrivate::QSslSocketPrivate()
    : initialized(false)
    , mode(QSslSocket::UnencryptedMode)
    , autoStartHandshake(false)
    , connectionEncrypted(false)
    , shutdown(false)
    , ignoreAllSslErrors(false)
    , readyReadEmittedPointer(0)
    , allowRootCertOnDemandLoading(true)
    , plainSocket(0)
    , paused(false)
{
    QSslConfigurationPrivate::deepCopyDefaultConfiguration(&configuration);
}

/*!
    \internal
*/
QSslSocketPrivate::~QSslSocketPrivate()
{
}

/*!
    \internal
*/
void QSslSocketPrivate::init()
{
    mode = QSslSocket::UnencryptedMode;
    autoStartHandshake = false;
    connectionEncrypted = false;
    ignoreAllSslErrors = false;
    shutdown = false;
    pendingClose = false;

    // we don't want to clear the ignoreErrorsList, so
    // that it is possible setting it before connecting
//    ignoreErrorsList.clear();

    buffer.clear();
    writeBuffer.clear();
    configuration.peerCertificate.clear();
    configuration.peerCertificateChain.clear();
}

/*!
    \internal
*/
QList<QSslCipher> QSslSocketPrivate::defaultCiphers()
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    return globalData()->config->ciphers;
}

/*!
    \internal
*/
QList<QSslCipher> QSslSocketPrivate::supportedCiphers()
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    return globalData()->supportedCiphers;
}

/*!
    \internal
*/
void QSslSocketPrivate::setDefaultCiphers(const QList<QSslCipher> &ciphers)
{
    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->config->ciphers = ciphers;
}

/*!
    \internal
*/
void QSslSocketPrivate::setDefaultSupportedCiphers(const QList<QSslCipher> &ciphers)
{
    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->supportedCiphers = ciphers;
}

/*!
    \internal
*/
QVector<QSslEllipticCurve> QSslSocketPrivate::supportedEllipticCurves()
{
    QSslSocketPrivate::ensureInitialized();
    const QMutexLocker locker(&globalData()->mutex);
    return globalData()->supportedEllipticCurves;
}

/*!
    \internal
*/
void QSslSocketPrivate::setDefaultSupportedEllipticCurves(const QVector<QSslEllipticCurve> &curves)
{
    const QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->supportedEllipticCurves = curves;
}

/*!
    \internal
*/
QList<QSslCertificate> QSslSocketPrivate::defaultCaCertificates()
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    return globalData()->config->caCertificates;
}

/*!
    \internal
*/
void QSslSocketPrivate::setDefaultCaCertificates(const QList<QSslCertificate> &certs)
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->config->caCertificates = certs;
    // when the certificates are set explicitly, we do not want to
    // load the system certificates on demand
    s_loadRootCertsOnDemand = false;
}

/*!
    \internal
*/
bool QSslSocketPrivate::addDefaultCaCertificates(const QString &path, QSsl::EncodingFormat format,
                                                 QRegExp::PatternSyntax syntax)
{
    QSslSocketPrivate::ensureInitialized();
    QList<QSslCertificate> certs = QSslCertificate::fromPath(path, format, syntax);
    if (certs.isEmpty())
        return false;

    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->config->caCertificates += certs;
    return true;
}

/*!
    \internal
*/
void QSslSocketPrivate::addDefaultCaCertificate(const QSslCertificate &cert)
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->config->caCertificates += cert;
}

/*!
    \internal
*/
void QSslSocketPrivate::addDefaultCaCertificates(const QList<QSslCertificate> &certs)
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    globalData()->config.detach();
    globalData()->config->caCertificates += certs;
}

/*!
    \internal
*/
QSslConfiguration QSslConfigurationPrivate::defaultConfiguration()
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    return QSslConfiguration(globalData()->config.data());
}

/*!
    \internal
*/
void QSslConfigurationPrivate::setDefaultConfiguration(const QSslConfiguration &configuration)
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    if (globalData()->config == configuration.d)
        return;                 // nothing to do

    globalData()->config = const_cast<QSslConfigurationPrivate*>(configuration.d.constData());
}

/*!
    \internal
*/
void QSslConfigurationPrivate::deepCopyDefaultConfiguration(QSslConfigurationPrivate *ptr)
{
    QSslSocketPrivate::ensureInitialized();
    QMutexLocker locker(&globalData()->mutex);
    const QSslConfigurationPrivate *global = globalData()->config.constData();

    if (!global)
        return;

    ptr->ref.store(1);
    ptr->peerCertificate = global->peerCertificate;
    ptr->peerCertificateChain = global->peerCertificateChain;
    ptr->localCertificateChain = global->localCertificateChain;
    ptr->privateKey = global->privateKey;
    ptr->sessionCipher = global->sessionCipher;
    ptr->sessionProtocol = global->sessionProtocol;
    ptr->ciphers = global->ciphers;
    ptr->caCertificates = global->caCertificates;
    ptr->protocol = global->protocol;
    ptr->peerVerifyMode = global->peerVerifyMode;
    ptr->peerVerifyDepth = global->peerVerifyDepth;
    ptr->sslOptions = global->sslOptions;
    ptr->ellipticCurves = global->ellipticCurves;
}

/*!
    \internal
*/
void QSslSocketPrivate::createPlainSocket(QIODevice::OpenMode openMode)
{
    Q_Q(QSslSocket);
    q->setOpenMode(openMode); // <- from QIODevice
    q->setSocketState(QAbstractSocket::UnconnectedState);
    q->setSocketError(QAbstractSocket::UnknownSocketError);
    q->setLocalPort(0);
    q->setLocalAddress(QHostAddress());
    q->setPeerPort(0);
    q->setPeerAddress(QHostAddress());
    q->setPeerName(QString());

    plainSocket = new QTcpSocket(q);
#ifndef QT_NO_BEARERMANAGEMENT
    //copy network session down to the plain socket (if it has been set)
    plainSocket->setProperty("_q_networksession", q->property("_q_networksession"));
#endif
    q->connect(plainSocket, SIGNAL(connected()),
               q, SLOT(_q_connectedSlot()),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(hostFound()),
               q, SLOT(_q_hostFoundSlot()),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(disconnected()),
               q, SLOT(_q_disconnectedSlot()),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
               q, SLOT(_q_stateChangedSlot(QAbstractSocket::SocketState)),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(error(QAbstractSocket::SocketError)),
               q, SLOT(_q_errorSlot(QAbstractSocket::SocketError)),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(readyRead()),
               q, SLOT(_q_readyReadSlot()),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(channelReadyRead(int)),
               q, SLOT(_q_channelReadyReadSlot(int)),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(bytesWritten(qint64)),
               q, SLOT(_q_bytesWrittenSlot(qint64)),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(channelBytesWritten(int, qint64)),
               q, SLOT(_q_channelBytesWrittenSlot(int, qint64)),
               Qt::DirectConnection);
#ifndef QT_NO_NETWORKPROXY
    q->connect(plainSocket, SIGNAL(proxyAuthenticationRequired(QNetworkProxy,QAuthenticator*)),
               q, SIGNAL(proxyAuthenticationRequired(QNetworkProxy,QAuthenticator*)));
#endif

    buffer.clear();
    writeBuffer.clear();
    connectionEncrypted = false;
    configuration.peerCertificate.clear();
    configuration.peerCertificateChain.clear();
    mode = QSslSocket::UnencryptedMode;
    q->setReadBufferSize(readBufferMaxSize);
}

void QSslSocketPrivate::pauseSocketNotifiers(QSslSocket *socket)
{
    if (!socket->d_func()->plainSocket)
        return;
    QAbstractSocketPrivate::pauseSocketNotifiers(socket->d_func()->plainSocket);
}

void QSslSocketPrivate::resumeSocketNotifiers(QSslSocket *socket)
{
    if (!socket->d_func()->plainSocket)
        return;
    QAbstractSocketPrivate::resumeSocketNotifiers(socket->d_func()->plainSocket);
}

bool QSslSocketPrivate::isPaused() const
{
    return paused;
}

bool QSslSocketPrivate::bind(const QHostAddress &address, quint16 port, QAbstractSocket::BindMode mode)
{
    // this function is called from QAbstractSocket::bind
    if (!initialized)
        init();
    initialized = false;

#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::bind(" << address << ',' << port << ',' << mode << ')';
#endif
    if (!plainSocket) {
#ifdef QSSLSOCKET_DEBUG
        qCDebug(lcSsl) << "\tcreating internal plain socket";
#endif
        createPlainSocket(QIODevice::ReadWrite);
    }
    bool ret = plainSocket->bind(address, port, mode);
    localPort = plainSocket->localPort();
    localAddress = plainSocket->localAddress();
    cachedSocketDescriptor = plainSocket->socketDescriptor();
    readChannelCount = writeChannelCount = 0;
    return ret;
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_connectedSlot()
{
    Q_Q(QSslSocket);
    q->setLocalPort(plainSocket->localPort());
    q->setLocalAddress(plainSocket->localAddress());
    q->setPeerPort(plainSocket->peerPort());
    q->setPeerAddress(plainSocket->peerAddress());
    q->setPeerName(plainSocket->peerName());
    cachedSocketDescriptor = plainSocket->socketDescriptor();
    readChannelCount = plainSocket->readChannelCount();
    writeChannelCount = plainSocket->writeChannelCount();

#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_connectedSlot()";
    qCDebug(lcSsl) << "\tstate =" << q->state();
    qCDebug(lcSsl) << "\tpeer =" << q->peerName() << q->peerAddress() << q->peerPort();
    qCDebug(lcSsl) << "\tlocal =" << QHostInfo::fromName(q->localAddress().toString()).hostName()
             << q->localAddress() << q->localPort();
#endif

    if (autoStartHandshake)
        q->startClientEncryption();

    emit q->connected();

    if (pendingClose && !autoStartHandshake) {
        pendingClose = false;
        q->disconnectFromHost();
    }
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_hostFoundSlot()
{
    Q_Q(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_hostFoundSlot()";
    qCDebug(lcSsl) << "\tstate =" << q->state();
#endif
    emit q->hostFound();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_disconnectedSlot()
{
    Q_Q(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_disconnectedSlot()";
    qCDebug(lcSsl) << "\tstate =" << q->state();
#endif
    disconnected();
    emit q->disconnected();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_stateChangedSlot(QAbstractSocket::SocketState state)
{
    Q_Q(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_stateChangedSlot(" << state << ')';
#endif
    q->setSocketState(state);
    emit q->stateChanged(state);
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_errorSlot(QAbstractSocket::SocketError error)
{
    Q_UNUSED(error)
#ifdef QSSLSOCKET_DEBUG
    Q_Q(QSslSocket);
    qCDebug(lcSsl) << "QSslSocket::_q_errorSlot(" << error << ')';
    qCDebug(lcSsl) << "\tstate =" << q->state();
    qCDebug(lcSsl) << "\terrorString =" << q->errorString();
#endif
    // this moves encrypted bytes from plain socket into our buffer
    if (plainSocket->bytesAvailable()) {
        qint64 tmpReadBufferMaxSize = readBufferMaxSize;
        readBufferMaxSize = 0; // reset temporarily so the plain sockets completely drained drained
        transmit();
        readBufferMaxSize = tmpReadBufferMaxSize;
    }

    setErrorAndEmit(plainSocket->error(), plainSocket->errorString());
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_readyReadSlot()
{
    Q_Q(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_readyReadSlot() -" << plainSocket->bytesAvailable() << "bytes available";
#endif
    if (mode == QSslSocket::UnencryptedMode) {
        if (readyReadEmittedPointer)
            *readyReadEmittedPointer = true;
        emit q->readyRead();
        return;
    }

    transmit();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_channelReadyReadSlot(int channel)
{
    Q_Q(QSslSocket);
    if (mode == QSslSocket::UnencryptedMode)
        emit q->channelReadyRead(channel);
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_bytesWrittenSlot(qint64 written)
{
    Q_Q(QSslSocket);
#ifdef QSSLSOCKET_DEBUG
    qCDebug(lcSsl) << "QSslSocket::_q_bytesWrittenSlot(" << written << ')';
#endif

    if (mode == QSslSocket::UnencryptedMode)
        emit q->bytesWritten(written);
    else
        emit q->encryptedBytesWritten(written);
    if (state == QAbstractSocket::ClosingState && writeBuffer.isEmpty())
        q->disconnectFromHost();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_channelBytesWrittenSlot(int channel, qint64 written)
{
    Q_Q(QSslSocket);
    if (mode == QSslSocket::UnencryptedMode)
        emit q->channelBytesWritten(channel, written);
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_flushWriteBuffer()
{
    Q_Q(QSslSocket);
    if (!writeBuffer.isEmpty())
        q->flush();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_flushReadBuffer()
{
    // trigger a read from the plainSocket into SSL
    if (mode != QSslSocket::UnencryptedMode)
        transmit();
}

/*!
    \internal
*/
void QSslSocketPrivate::_q_resumeImplementation()
{
    if (plainSocket)
        plainSocket->resume();
    paused = false;
    if (!connectionEncrypted) {
        if (verifyErrorsHaveBeenIgnored()) {
            continueHandshake();
        } else {
            setErrorAndEmit(QAbstractSocket::SslHandshakeFailedError, sslErrors.constFirst().errorString());
            plainSocket->disconnectFromHost();
            return;
        }
    }
    transmit();
}

/*!
    \internal
*/
bool QSslSocketPrivate::verifyErrorsHaveBeenIgnored()
{
    bool doEmitSslError;
    if (!ignoreErrorsList.empty()) {
        // check whether the errors we got are all in the list of expected errors
        // (applies only if the method QSslSocket::ignoreSslErrors(const QList<QSslError> &errors)
        // was called)
        doEmitSslError = false;
        for (int a = 0; a < sslErrors.count(); a++) {
            if (!ignoreErrorsList.contains(sslErrors.at(a))) {
                doEmitSslError = true;
                break;
            }
        }
    } else {
        // if QSslSocket::ignoreSslErrors(const QList<QSslError> &errors) was not called and
        // we get an SSL error, emit a signal unless we ignored all errors (by calling
        // QSslSocket::ignoreSslErrors() )
        doEmitSslError = !ignoreAllSslErrors;
    }
    return !doEmitSslError;
}

/*!
    \internal
*/
qint64 QSslSocketPrivate::peek(char *data, qint64 maxSize)
{
    if (mode == QSslSocket::UnencryptedMode && !autoStartHandshake) {
        //unencrypted mode - do not use QIODevice::peek, as it reads ahead data from the plain socket
        //peek at data already in the QIODevice buffer (from a previous read)
        qint64 r = buffer.peek(data, maxSize, transactionPos);
        if (r == maxSize)
            return r;
        data += r;
        //peek at data in the plain socket
        if (plainSocket) {
            qint64 r2 = plainSocket->peek(data, maxSize - r);
            if (r2 < 0)
                return (r > 0 ? r : r2);
            return r + r2;
        } else {
            return -1;
        }
    } else {
        //encrypted mode - the socket engine will read and decrypt data into the QIODevice buffer
        return QTcpSocketPrivate::peek(data, maxSize);
    }
}

/*!
    \internal
*/
QByteArray QSslSocketPrivate::peek(qint64 maxSize)
{
    if (mode == QSslSocket::UnencryptedMode && !autoStartHandshake) {
        //unencrypted mode - do not use QIODevice::peek, as it reads ahead data from the plain socket
        //peek at data already in the QIODevice buffer (from a previous read)
        QByteArray ret;
        ret.reserve(maxSize);
        ret.resize(buffer.peek(ret.data(), maxSize, transactionPos));
        if (ret.length() == maxSize)
            return ret;
        //peek at data in the plain socket
        if (plainSocket)
            return ret + plainSocket->peek(maxSize - ret.length());
        else
            return QByteArray();
    } else {
        //encrypted mode - the socket engine will read and decrypt data into the QIODevice buffer
        return QTcpSocketPrivate::peek(maxSize);
    }
}

/*!
    \internal
*/
bool QSslSocketPrivate::rootCertOnDemandLoadingSupported()
{
    return s_loadRootCertsOnDemand;
}

/*!
    \internal
*/
QList<QByteArray> QSslSocketPrivate::unixRootCertDirectories()
{
    return QList<QByteArray>() <<  "/etc/ssl/certs/" // (K)ubuntu, OpenSUSE, Mandriva, MeeGo ...
                               << "/usr/lib/ssl/certs/" // Gentoo, Mandrake
                               << "/usr/share/ssl/" // Centos, Redhat, SuSE
                               << "/usr/local/ssl/" // Normal OpenSSL Tarball
                               << "/var/ssl/certs/" // AIX
                               << "/usr/local/ssl/certs/" // Solaris
                               << "/etc/openssl/certs/" // BlackBerry
                               << "/opt/openssl/certs/" // HP-UX
                               << "/etc/ssl/"; // OpenBSD
}

/*!
    \internal
*/
void QSslSocketPrivate::checkSettingSslContext(QSslSocket* socket, QSharedPointer<QSslContext> sslContext)
{
    if (socket->d_func()->sslContextPointer.isNull())
        socket->d_func()->sslContextPointer = sslContext;
}

/*!
    \internal
*/
QSharedPointer<QSslContext> QSslSocketPrivate::sslContext(QSslSocket *socket)
{
    return (socket) ? socket->d_func()->sslContextPointer : QSharedPointer<QSslContext>();
}

bool QSslSocketPrivate::isMatchingHostname(const QSslCertificate &cert, const QString &peerName)
{
    const QString lowerPeerName = peerName.toLower();
    const QStringList commonNames = cert.subjectInfo(QSslCertificate::CommonName);

    for (const QString &commonName : commonNames) {
        if (isMatchingHostname(commonName.toLower(), lowerPeerName))
            return true;
    }

    const auto subjectAlternativeNames = cert.subjectAlternativeNames();
    const auto altNames = subjectAlternativeNames.equal_range(QSsl::DnsEntry);
    for (auto it = altNames.first; it != altNames.second; ++it) {
        if (isMatchingHostname(it->toLower(), lowerPeerName))
            return true;
    }

    return false;
}

bool QSslSocketPrivate::isMatchingHostname(const QString &cn, const QString &hostname)
{
    int wildcard = cn.indexOf(QLatin1Char('*'));

    // Check this is a wildcard cert, if not then just compare the strings
    if (wildcard < 0)
        return cn == hostname;

    int firstCnDot = cn.indexOf(QLatin1Char('.'));
    int secondCnDot = cn.indexOf(QLatin1Char('.'), firstCnDot+1);

    // Check at least 3 components
    if ((-1 == secondCnDot) || (secondCnDot+1 >= cn.length()))
        return false;

    // Check * is last character of 1st component (ie. there's a following .)
    if (wildcard+1 != firstCnDot)
        return false;

    // Check only one star
    if (cn.lastIndexOf(QLatin1Char('*')) != wildcard)
        return false;

    // Check characters preceding * (if any) match
    if (wildcard && (hostname.leftRef(wildcard) != cn.leftRef(wildcard)))
        return false;

    // Check characters following first . match
    if (hostname.midRef(hostname.indexOf(QLatin1Char('.'))) != cn.midRef(firstCnDot))
        return false;

    // Check if the hostname is an IP address, if so then wildcards are not allowed
    QHostAddress addr(hostname);
    if (!addr.isNull())
        return false;

    // Ok, I guess this was a wildcard CN and the hostname matches.
    return true;
}

QT_END_NAMESPACE

#include "moc_qsslsocket.cpp"