summaryrefslogtreecommitdiff
path: root/ci.c
blob: f86f668e4671d4cb21319025b88bf7e7d19ae9f9 (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
/*
 * ci.c: Common Interface
 *
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
 * $Id: ci.c 4.2 2015/09/05 11:45:19 kls Exp $
 */

#include "ci.h"
#include <ctype.h>
#include <linux/dvb/ca.h>
#include <malloc.h>
#include <netinet/in.h>
#include <poll.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#include "device.h"
#include "pat.h"
#include "receiver.h"
#include "remux.h"
#include "libsi/si.h"
#include "skins.h"
#include "tools.h"

// Set these to 'true' for debug output:
static bool DumpTPDUDataTransfer = false;
static bool DebugProtocol = false;
static bool DumpPolls = false;
static bool DumpDateTime = false;

#define dbgprotocol(a...) if (DebugProtocol) fprintf(stderr, a)

// --- Helper functions ------------------------------------------------------

#define SIZE_INDICATOR 0x80

static const uint8_t *GetLength(const uint8_t *Data, int &Length)
///< Gets the length field from the beginning of Data.
///< Returns a pointer to the first byte after the length and
///< stores the length value in Length.
{
  Length = *Data++;
  if ((Length & SIZE_INDICATOR) != 0) {
     int l = Length & ~SIZE_INDICATOR;
     Length = 0;
     for (int i = 0; i < l; i++)
         Length = (Length << 8) | *Data++;
     }
  return Data;
}

static uint8_t *SetLength(uint8_t *Data, int Length)
///< Sets the length field at the beginning of Data.
///< Returns a pointer to the first byte after the length.
{
  uint8_t *p = Data;
  if (Length < 128)
     *p++ = Length;
  else {
     int n = sizeof(Length);
     for (int i = n - 1; i >= 0; i--) {
         int b = (Length >> (8 * i)) & 0xFF;
         if (p != Data || b)
            *++p = b;
         }
     *Data = (p - Data) | SIZE_INDICATOR;
     p++;
     }
  return p;
}

static char *CopyString(int Length, const uint8_t *Data)
///< Copies the string at Data.
///< Returns a pointer to a newly allocated string.
{
  // Some CAMs send funny characters at the beginning of strings.
  // Let's just skip them:
  while (Length > 0 && (*Data == ' ' || *Data == 0x05 || *Data == 0x96 || *Data == 0x97)) {
        Length--;
        Data++;
        }
  char *s = MALLOC(char, Length + 1);
  strncpy(s, (char *)Data, Length);
  s[Length] = 0;
  // The character 0x8A is used as newline, so let's put a real '\n' in there:
  strreplace(s, 0x8A, '\n');
  return s;
}

static char *GetString(int &Length, const uint8_t **Data)
///< Gets the string at Data.
///< Returns a pointer to a newly allocated string, or NULL in case of error.
///< Upon return Length and Data represent the remaining data after the string has been skipped.
{
  if (Length > 0 && Data && *Data) {
     int l = 0;
     const uint8_t *d = GetLength(*Data, l);
     char *s = CopyString(l, d);
     Length -= d - *Data + l;
     *Data = d + l;
     return s;
     }
  return NULL;
}

// --- cCaPidReceiver --------------------------------------------------------

// A receiver that is used to make the device receive the ECM pids, as well as the
// CAT and the EMM pids.

class cCaPidReceiver : public cReceiver {
private:
  int catVersion;
  cVector<int> emmPids;
  uchar buffer[2048]; // 11 bit length, max. 2048 byte
  uchar *bufp;
  int length;
  void AddEmmPid(int Pid);
  void DelEmmPids(void);
protected:
  virtual void Activate(bool On);
public:
  cCaPidReceiver(void);
  virtual ~cCaPidReceiver() { Detach(); }
  virtual void Receive(const uchar *Data, int Length);
  bool HasCaPids(void) const { return NumPids() - emmPids.Size() - 1 > 0; }
  void Reset(void) { DelEmmPids(); catVersion = -1; }
  };

cCaPidReceiver::cCaPidReceiver(void)
{
  catVersion = -1;
  bufp = NULL;
  length = 0;
  AddPid(CATPID);
}

void cCaPidReceiver::AddEmmPid(int Pid)
{
  for (int i = 0; i < emmPids.Size(); i++) {
      if (emmPids[i] == Pid)
         return;
      }
  emmPids.Append(Pid);
  AddPid(Pid);
}

void cCaPidReceiver::DelEmmPids(void)
{
  for (int i = 0; i < emmPids.Size(); i++)
      DelPid(emmPids[i]);
  emmPids.Clear();
}

void cCaPidReceiver::Activate(bool On)
{
  catVersion = -1; // can be done independent of 'On'
}

void cCaPidReceiver::Receive(const uchar *Data, int Length)
{
  if (TsPid(Data) == CATPID) {
     const uchar *p = NULL;
     if (TsPayloadStart(Data)) {
        if (Data[5] == SI::TableIdCAT) {
           length = (int(Data[6] & 0x03) << 8) | Data[7]; // section length
           if (length > 5) {
              int v = (Data[10] & 0x3E) >> 1; // version number
              if (v != catVersion) {
                 if (Data[11] == 0 && Data[12] == 0) { // section number, last section number
                    if (length > TS_SIZE - 8) {
                       int n = TS_SIZE - 13;
                       memcpy(buffer, Data + 13, n);
                       bufp = buffer + n;
                       length -= n + 5; // 5 = header
                       }
                    else {
                       p = Data + 13; // no need to copy the data
                       length -= 5; // header
                       }
                    }
                 else
                    dsyslog("multi table CAT section - unhandled!");
                 catVersion = v;
                 }
              }
           }
        }
     else if (bufp && length > 0) {
        int n = min(length, TS_SIZE - 4);
        if (bufp + n - buffer <= int(sizeof(buffer))) {
           memcpy(bufp, Data + 4, n);
           bufp += n;
           length -= n;
           if (length <= 0) {
              p = buffer;
              length = bufp - buffer;
              }
           }
        else {
           esyslog("ERROR: buffer overflow in cCaPidReceiver::Receive()");
           bufp = 0;
           length = 0;
           }
        }
     if (p) {
        int OldCatVersion = catVersion; // must preserve the current version number
        cDevice *AttachedDevice = Device();
        if (AttachedDevice)
           AttachedDevice->Detach(this);
        DelEmmPids();
        for (int i = 0; i < length - 4; i++) { // -4 = checksum
            if (p[i] == 0x09) {
               int CaId = int(p[i + 2] << 8) | p[i + 3];
               int EmmPid = int(((p[i + 4] & 0x1F) << 8)) | p[i + 5];
               AddEmmPid(EmmPid);
               switch (CaId >> 8) {
                 case 0x01: for (int j = i + 7; j < p[i + 1] + 2; j += 4) {
                                EmmPid = (int(p[j] & 0x0F) << 8) | p[j + 1];
                                AddEmmPid(EmmPid);
                                }
                            break;
                 }
               i += p[i + 1] + 2 - 1; // -1 to compensate for the loop increment
               }
            }
        if (AttachedDevice)
           AttachedDevice->AttachReceiver(this);
        catVersion = OldCatVersion;
        p = NULL;
        bufp = 0;
        length = 0;
        }
     }
}

// --- cCaActivationReceiver -------------------------------------------------

// A receiver that is used to make the device stay on a given channel and
// keep the CAM slot assigned.

#define UNSCRAMBLE_TIME     5 // seconds of receiving purely unscrambled data before considering the smart card "activated"
#define TS_PACKET_FACTOR 1024 // only process every TS_PACKET_FACTORth packet to keep the load down

class cCaActivationReceiver : public cReceiver {
private:
  cCamSlot *camSlot;
  time_t lastScrambledTime;
  int numTsPackets;
protected:
  virtual void Receive(const uchar *Data, int Length);
public:
  cCaActivationReceiver(const cChannel *Channel, cCamSlot *CamSlot);
  virtual ~cCaActivationReceiver();
  };

cCaActivationReceiver::cCaActivationReceiver(const cChannel *Channel, cCamSlot *CamSlot)
:cReceiver(Channel, MINPRIORITY + 1)
{
  camSlot = CamSlot;
  lastScrambledTime = time(NULL);
  numTsPackets = 0;
}

cCaActivationReceiver::~cCaActivationReceiver()
{
  Detach();
}

void cCaActivationReceiver::Receive(const uchar *Data, int Length)
{
  if (numTsPackets++ % TS_PACKET_FACTOR == 0) {
     time_t Now = time(NULL);
     if (TsIsScrambled(Data))
        lastScrambledTime = Now;
     else if (Now - lastScrambledTime > UNSCRAMBLE_TIME) {
        dsyslog("CAM %d: activated!", camSlot->SlotNumber());
        Skins.QueueMessage(mtInfo, tr("CAM activated!"));
        Detach();
        }
     }
}

// --- cTPDU -----------------------------------------------------------------

#define MAX_TPDU_SIZE  2048
#define MAX_TPDU_DATA  (MAX_TPDU_SIZE - 4)

#define DATA_INDICATOR 0x80

#define T_SB           0x80
#define T_RCV          0x81
#define T_CREATE_TC    0x82
#define T_CTC_REPLY    0x83
#define T_DELETE_TC    0x84
#define T_DTC_REPLY    0x85
#define T_REQUEST_TC   0x86
#define T_NEW_TC       0x87
#define T_TC_ERROR     0x88
#define T_DATA_LAST    0xA0
#define T_DATA_MORE    0xA1

class cTPDU {
private:
  int size;
  uint8_t buffer[MAX_TPDU_SIZE];
  const uint8_t *GetData(const uint8_t *Data, int &Length);
public:
  cTPDU(void) { size = 0; }
  cTPDU(uint8_t Slot, uint8_t Tcid, uint8_t Tag, int Length = 0, const uint8_t *Data = NULL);
  uint8_t Slot(void) { return buffer[0]; }
  uint8_t Tcid(void) { return buffer[1]; }
  uint8_t Tag(void)  { return buffer[2]; }
  const uint8_t *Data(int &Length) { return GetData(buffer + 3, Length); }
  uint8_t Status(void);
  uint8_t *Buffer(void) { return buffer; }
  int Size(void) { return size; }
  void SetSize(int Size) { size = Size; }
  int MaxSize(void) { return sizeof(buffer); }
  void Dump(int SlotNumber, bool Outgoing);
  };

cTPDU::cTPDU(uint8_t Slot, uint8_t Tcid, uint8_t Tag, int Length, const uint8_t *Data)
{
  size = 0;
  buffer[0] = Slot;
  buffer[1] = Tcid;
  buffer[2] = Tag;
  switch (Tag) {
    case T_RCV:
    case T_CREATE_TC:
    case T_CTC_REPLY:
    case T_DELETE_TC:
    case T_DTC_REPLY:
    case T_REQUEST_TC:
         buffer[3] = 1; // length
         buffer[4] = Tcid;
         size = 5;
         break;
    case T_NEW_TC:
    case T_TC_ERROR:
         if (Length == 1) {
            buffer[3] = 2; // length
            buffer[4] = Tcid;
            buffer[5] = Data[0];
            size = 6;
            }
         else
            esyslog("ERROR: invalid data length for TPDU tag 0x%02X: %d (%d/%d)", Tag, Length, Slot, Tcid);
         break;
    case T_DATA_LAST:
    case T_DATA_MORE:
         if (Length <= MAX_TPDU_DATA) {
            uint8_t *p = buffer + 3;
            p = SetLength(p, Length + 1);
            *p++ = Tcid;
            if (Length)
               memcpy(p, Data, Length);
            size = Length + (p - buffer);
            }
         else
            esyslog("ERROR: invalid data length for TPDU tag 0x%02X: %d (%d/%d)", Tag, Length, Slot, Tcid);
         break;
    default:
         esyslog("ERROR: unknown TPDU tag: 0x%02X (%d/%d)", Tag, Slot, Tcid);
    }
 }

void cTPDU::Dump(int SlotNumber, bool Outgoing)
{
  if (DumpTPDUDataTransfer && (DumpPolls || Tag() != T_SB)) {
#define MAX_DUMP 256
     fprintf(stderr, "     %d: %s ", SlotNumber, Outgoing ? "-->" : "<--");
     for (int i = 0; i < size && i < MAX_DUMP; i++)
         fprintf(stderr, "%02X ", buffer[i]);
     fprintf(stderr, "%s\n", size >= MAX_DUMP ? "..." : "");
     if (!Outgoing) {
        fprintf(stderr, "           ");
        for (int i = 0; i < size && i < MAX_DUMP; i++)
            fprintf(stderr, "%2c ", isprint(buffer[i]) ? buffer[i] : '.');
        fprintf(stderr, "%s\n", size >= MAX_DUMP ? "..." : "");
        }
     }
}

const uint8_t *cTPDU::GetData(const uint8_t *Data, int &Length)
{
  if (size) {
     Data = GetLength(Data, Length);
     if (Length) {
        Length--; // the first byte is always the tcid
        return Data + 1;
        }
     }
  return NULL;
}

uint8_t cTPDU::Status(void)
{
  if (size >= 4 && buffer[size - 4] == T_SB && buffer[size - 3] == 2)
     return buffer[size - 1];
  return 0;
}

// --- cCiTransportConnection ------------------------------------------------

#define MAX_SESSIONS_PER_TC  16

class cCiTransportConnection {
private:
  enum eState { stIDLE, stCREATION, stACTIVE, stDELETION };
  cCamSlot *camSlot;
  uint8_t tcid;
  eState state;
  bool createConnectionRequested;
  bool deleteConnectionRequested;
  bool hasUserIO;
  cTimeMs alive;
  cTimeMs timer;
  cCiSession *sessions[MAX_SESSIONS_PER_TC + 1]; // session numbering starts with 1
  void SendTPDU(uint8_t Tag, int Length = 0, const uint8_t *Data = NULL);
  void SendTag(uint8_t Tag, uint16_t SessionId, uint32_t ResourceId = 0, int Status = -1);
  void Poll(void);
  uint32_t ResourceIdToInt(const uint8_t *Data);
  cCiSession *GetSessionBySessionId(uint16_t SessionId);
  void OpenSession(int Length, const uint8_t *Data);
  void CloseSession(uint16_t SessionId);
  void HandleSessions(cTPDU *TPDU);
public:
  cCiTransportConnection(cCamSlot *CamSlot, uint8_t Tcid);
  virtual ~cCiTransportConnection();
  cCamSlot *CamSlot(void) { return camSlot; }
  uint8_t Tcid(void) const { return tcid; }
  void CreateConnection(void) { createConnectionRequested = true; }
  void DeleteConnection(void) { deleteConnectionRequested = true; }
  const char *GetCamName(void);
  bool Ready(void);
  bool HasUserIO(void) { return hasUserIO; }
  void SendData(int Length, const uint8_t *Data);
  bool Process(cTPDU *TPDU = NULL);
  cCiSession *GetSessionByResourceId(uint32_t ResourceId);
  };

// --- cCiSession ------------------------------------------------------------

// Session Tags:

#define ST_SESSION_NUMBER           0x90
#define ST_OPEN_SESSION_REQUEST     0x91
#define ST_OPEN_SESSION_RESPONSE    0x92
#define ST_CREATE_SESSION           0x93
#define ST_CREATE_SESSION_RESPONSE  0x94
#define ST_CLOSE_SESSION_REQUEST    0x95
#define ST_CLOSE_SESSION_RESPONSE   0x96

// Session Status:

#define SS_OK             0x00
#define SS_NOT_ALLOCATED  0xF0

// Resource Identifiers:

#define RI_RESOURCE_MANAGER            0x00010041
#define RI_APPLICATION_INFORMATION     0x00020041
#define RI_CONDITIONAL_ACCESS_SUPPORT  0x00030041
#define RI_HOST_CONTROL                0x00200041
#define RI_DATE_TIME                   0x00240041
#define RI_MMI                         0x00400041

// Application Object Tags:

#define AOT_NONE                    0x000000
#define AOT_PROFILE_ENQ             0x9F8010
#define AOT_PROFILE                 0x9F8011
#define AOT_PROFILE_CHANGE          0x9F8012
#define AOT_APPLICATION_INFO_ENQ    0x9F8020
#define AOT_APPLICATION_INFO        0x9F8021
#define AOT_ENTER_MENU              0x9F8022
#define AOT_CA_INFO_ENQ             0x9F8030
#define AOT_CA_INFO                 0x9F8031
#define AOT_CA_PMT                  0x9F8032
#define AOT_CA_PMT_REPLY            0x9F8033
#define AOT_TUNE                    0x9F8400
#define AOT_REPLACE                 0x9F8401
#define AOT_CLEAR_REPLACE           0x9F8402
#define AOT_ASK_RELEASE             0x9F8403
#define AOT_DATE_TIME_ENQ           0x9F8440
#define AOT_DATE_TIME               0x9F8441
#define AOT_CLOSE_MMI               0x9F8800
#define AOT_DISPLAY_CONTROL         0x9F8801
#define AOT_DISPLAY_REPLY           0x9F8802
#define AOT_TEXT_LAST               0x9F8803
#define AOT_TEXT_MORE               0x9F8804
#define AOT_KEYPAD_CONTROL          0x9F8805
#define AOT_KEYPRESS                0x9F8806
#define AOT_ENQ                     0x9F8807
#define AOT_ANSW                    0x9F8808
#define AOT_MENU_LAST               0x9F8809
#define AOT_MENU_MORE               0x9F880A
#define AOT_MENU_ANSW               0x9F880B
#define AOT_LIST_LAST               0x9F880C
#define AOT_LIST_MORE               0x9F880D
#define AOT_SUBTITLE_SEGMENT_LAST   0x9F880E
#define AOT_SUBTITLE_SEGMENT_MORE   0x9F880F
#define AOT_DISPLAY_MESSAGE         0x9F8810
#define AOT_SCENE_END_MARK          0x9F8811
#define AOT_SCENE_DONE              0x9F8812
#define AOT_SCENE_CONTROL           0x9F8813
#define AOT_SUBTITLE_DOWNLOAD_LAST  0x9F8814
#define AOT_SUBTITLE_DOWNLOAD_MORE  0x9F8815
#define AOT_FLUSH_DOWNLOAD          0x9F8816
#define AOT_DOWNLOAD_REPLY          0x9F8817
#define AOT_COMMS_CMD               0x9F8C00
#define AOT_CONNECTION_DESCRIPTOR   0x9F8C01
#define AOT_COMMS_REPLY             0x9F8C02
#define AOT_COMMS_SEND_LAST         0x9F8C03
#define AOT_COMMS_SEND_MORE         0x9F8C04
#define AOT_COMMS_RCV_LAST          0x9F8C05
#define AOT_COMMS_RCV_MORE          0x9F8C06

class cCiSession {
private:
  uint16_t sessionId;
  uint32_t resourceId;
  cCiTransportConnection *tc;
protected:
  int GetTag(int &Length, const uint8_t **Data);
  const uint8_t *GetData(const uint8_t *Data, int &Length);
  void SendData(int Tag, int Length = 0, const uint8_t *Data = NULL);
  cCiTransportConnection *Tc(void) { return tc; }
public:
  cCiSession(uint16_t SessionId, uint32_t ResourceId, cCiTransportConnection *Tc);
  virtual ~cCiSession();
  uint16_t SessionId(void) { return sessionId; }
  uint32_t ResourceId(void) { return resourceId; }
  virtual bool HasUserIO(void) { return false; }
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  };

cCiSession::cCiSession(uint16_t SessionId, uint32_t ResourceId, cCiTransportConnection *Tc)
{
  sessionId = SessionId;
  resourceId = ResourceId;
  tc = Tc;
}

cCiSession::~cCiSession()
{
}

int cCiSession::GetTag(int &Length, const uint8_t **Data)
///< Gets the tag at Data.
///< Returns the actual tag, or AOT_NONE in case of error.
///< Upon return Length and Data represent the remaining data after the tag has been skipped.
{
  if (Length >= 3 && Data && *Data) {
     int t = 0;
     for (int i = 0; i < 3; i++)
         t = (t << 8) | *(*Data)++;
     Length -= 3;
     return t;
     }
  return AOT_NONE;
}

const uint8_t *cCiSession::GetData(const uint8_t *Data, int &Length)
{
  Data = GetLength(Data, Length);
  return Length ? Data : NULL;
}

void cCiSession::SendData(int Tag, int Length, const uint8_t *Data)
{
  uint8_t buffer[2048];
  uint8_t *p = buffer;
  *p++ = ST_SESSION_NUMBER;
  *p++ = 0x02;
  *p++ = (sessionId >> 8) & 0xFF;
  *p++ =  sessionId       & 0xFF;
  *p++ = (Tag >> 16) & 0xFF;
  *p++ = (Tag >>  8) & 0xFF;
  *p++ =  Tag        & 0xFF;
  p = SetLength(p, Length);
  if (p - buffer + Length < int(sizeof(buffer))) {
     if (Data)
        memcpy(p, Data, Length);
     p += Length;
     tc->SendData(p - buffer, buffer);
     }
  else
     esyslog("ERROR: CAM %d: data length (%d) exceeds buffer size", Tc()->CamSlot()->SlotNumber(), Length);
}

void cCiSession::Process(int Length, const uint8_t *Data)
{
}

// --- cCiResourceManager ----------------------------------------------------

class cCiResourceManager : public cCiSession {
private:
  int state;
public:
  cCiResourceManager(uint16_t SessionId, cCiTransportConnection *Tc);
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  };

cCiResourceManager::cCiResourceManager(uint16_t SessionId, cCiTransportConnection *Tc)
:cCiSession(SessionId, RI_RESOURCE_MANAGER, Tc)
{
  dbgprotocol("Slot %d: new Resource Manager (session id %d)\n", Tc->CamSlot()->SlotNumber(), SessionId);
  state = 0;
}

void cCiResourceManager::Process(int Length, const uint8_t *Data)
{
  if (Data) {
     int Tag = GetTag(Length, &Data);
     switch (Tag) {
       case AOT_PROFILE_ENQ: {
            dbgprotocol("Slot %d: <== Profile Enquiry (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            uint32_t resources[] = { htonl(RI_RESOURCE_MANAGER),
                                     htonl(RI_APPLICATION_INFORMATION),
                                     htonl(RI_CONDITIONAL_ACCESS_SUPPORT),
                                     htonl(RI_DATE_TIME),
                                     htonl(RI_MMI)
                                   };
            dbgprotocol("Slot %d: ==> Profile (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            SendData(AOT_PROFILE, sizeof(resources), (uint8_t*)resources);
            state = 3;
            }
            break;
       case AOT_PROFILE: {
            dbgprotocol("Slot %d: <== Profile (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            if (state == 1) {
               int l = 0;
               const uint8_t *d = GetData(Data, l);
               if (l > 0 && d)
                  esyslog("ERROR: CAM %d: resource manager: unexpected data", Tc()->CamSlot()->SlotNumber());
               dbgprotocol("Slot %d: ==> Profile Change (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
               SendData(AOT_PROFILE_CHANGE);
               state = 2;
               }
            else {
               esyslog("ERROR: CAM %d: resource manager: unexpected tag %06X in state %d", Tc()->CamSlot()->SlotNumber(), Tag, state);
               }
            }
            break;
       default: esyslog("ERROR: CAM %d: resource manager: unknown tag %06X", Tc()->CamSlot()->SlotNumber(), Tag);
       }
     }
  else if (state == 0) {
     dbgprotocol("Slot %d: ==> Profile Enq (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
     SendData(AOT_PROFILE_ENQ);
     state = 1;
     }
}

// --- cCiApplicationInformation ---------------------------------------------

class cCiApplicationInformation : public cCiSession {
private:
  int state;
  uint8_t applicationType;
  uint16_t applicationManufacturer;
  uint16_t manufacturerCode;
  char *menuString;
public:
  cCiApplicationInformation(uint16_t SessionId, cCiTransportConnection *Tc);
  virtual ~cCiApplicationInformation();
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  bool EnterMenu(void);
  const char *GetMenuString(void) { return menuString; }
  };

cCiApplicationInformation::cCiApplicationInformation(uint16_t SessionId, cCiTransportConnection *Tc)
:cCiSession(SessionId, RI_APPLICATION_INFORMATION, Tc)
{
  dbgprotocol("Slot %d: new Application Information (session id %d)\n", Tc->CamSlot()->SlotNumber(), SessionId);
  state = 0;
  menuString = NULL;
}

cCiApplicationInformation::~cCiApplicationInformation()
{
  free(menuString);
}

void cCiApplicationInformation::Process(int Length, const uint8_t *Data)
{
  if (Data) {
     int Tag = GetTag(Length, &Data);
     switch (Tag) {
       case AOT_APPLICATION_INFO: {
            dbgprotocol("Slot %d: <== Application Info (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if ((l -= 1) < 0) break;
            applicationType = *d++;
            if ((l -= 2) < 0) break;
            applicationManufacturer = ntohs(get_unaligned((uint16_t *)d));
            d += 2;
            if ((l -= 2) < 0) break;
            manufacturerCode = ntohs(get_unaligned((uint16_t *)d));
            d += 2;
            free(menuString);
            menuString = GetString(l, &d);
            isyslog("CAM %d: %s, %02X, %04X, %04X", Tc()->CamSlot()->SlotNumber(), menuString, applicationType, applicationManufacturer, manufacturerCode);
            state = 2;
            }
            break;
       default: esyslog("ERROR: CAM %d: application information: unknown tag %06X", Tc()->CamSlot()->SlotNumber(), Tag);
       }
     }
  else if (state == 0) {
     dbgprotocol("Slot %d: ==> Application Info Enq (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
     SendData(AOT_APPLICATION_INFO_ENQ);
     state = 1;
     }
}

bool cCiApplicationInformation::EnterMenu(void)
{
  if (state == 2) {
     dbgprotocol("Slot %d: ==> Enter Menu (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
     SendData(AOT_ENTER_MENU);
     return true;
     }
  return false;
}

// --- cCiCaPmt --------------------------------------------------------------

#define MAXCASYSTEMIDS 64

// Ca Pmt List Management:

#define CPLM_MORE    0x00
#define CPLM_FIRST   0x01
#define CPLM_LAST    0x02
#define CPLM_ONLY    0x03
#define CPLM_ADD     0x04
#define CPLM_UPDATE  0x05

// Ca Pmt Cmd Ids:

#define CPCI_OK_DESCRAMBLING  0x01
#define CPCI_OK_MMI           0x02
#define CPCI_QUERY            0x03
#define CPCI_NOT_SELECTED     0x04

class cCiCaPmt {
  friend class cCiConditionalAccessSupport;
private:
  uint8_t cmdId;
  int length;
  int esInfoLengthPos;
  uint8_t capmt[2048]; ///< XXX is there a specified maximum?
  int source;
  int transponder;
  int programNumber;
  int caSystemIds[MAXCASYSTEMIDS + 1]; // list is zero terminated!
  void AddCaDescriptors(int Length, const uint8_t *Data);
public:
  cCiCaPmt(uint8_t CmdId, int Source, int Transponder, int ProgramNumber, const int *CaSystemIds);
  uint8_t CmdId(void) { return cmdId; }
  void SetListManagement(uint8_t ListManagement);
  uint8_t ListManagement(void) { return capmt[0]; }
  void AddPid(int Pid, uint8_t StreamType);
  };

cCiCaPmt::cCiCaPmt(uint8_t CmdId, int Source, int Transponder, int ProgramNumber, const int *CaSystemIds)
{
  cmdId = CmdId;
  source = Source;
  transponder = Transponder;
  programNumber = ProgramNumber;
  int i = 0;
  if (CaSystemIds) {
     for (; CaSystemIds[i]; i++)
         caSystemIds[i] = CaSystemIds[i];
     }
  caSystemIds[i] = 0;
  uint8_t caDescriptors[512];
  int caDescriptorsLength = GetCaDescriptors(source, transponder, programNumber, caSystemIds, sizeof(caDescriptors), caDescriptors, 0);
  length = 0;
  capmt[length++] = CPLM_ONLY;
  capmt[length++] = (ProgramNumber >> 8) & 0xFF;
  capmt[length++] =  ProgramNumber       & 0xFF;
  capmt[length++] = 0x01; // version_number, current_next_indicator - apparently vn doesn't matter, but cni must be 1
  esInfoLengthPos = length;
  capmt[length++] = 0x00; // program_info_length H (at program level)
  capmt[length++] = 0x00; // program_info_length L
  AddCaDescriptors(caDescriptorsLength, caDescriptors);
}

void cCiCaPmt::SetListManagement(uint8_t ListManagement)
{
  capmt[0] = ListManagement;
}

void cCiCaPmt::AddPid(int Pid, uint8_t StreamType)
{
  if (Pid) {
     uint8_t caDescriptors[512];
     int caDescriptorsLength = GetCaDescriptors(source, transponder, programNumber, caSystemIds, sizeof(caDescriptors), caDescriptors, Pid);
     //XXX buffer overflow check???
     capmt[length++] = StreamType;
     capmt[length++] = (Pid >> 8) & 0xFF;
     capmt[length++] =  Pid       & 0xFF;
     esInfoLengthPos = length;
     capmt[length++] = 0x00; // ES_info_length H (at ES level)
     capmt[length++] = 0x00; // ES_info_length L
     AddCaDescriptors(caDescriptorsLength, caDescriptors);
     }
}

void cCiCaPmt::AddCaDescriptors(int Length, const uint8_t *Data)
{
  if (esInfoLengthPos) {
     if (length + Length < int(sizeof(capmt))) {
        if (Length || cmdId == CPCI_QUERY) {
           capmt[length++] = cmdId;
           memcpy(capmt + length, Data, Length);
           length += Length;
           int l = length - esInfoLengthPos - 2;
           capmt[esInfoLengthPos]     = (l >> 8) & 0xFF;
           capmt[esInfoLengthPos + 1] =  l       & 0xFF;
           }
        }
     else
        esyslog("ERROR: buffer overflow in CA descriptor");
     esInfoLengthPos = 0;
     }
  else
     esyslog("ERROR: adding CA descriptor without Pid!");
}

// --- cCiConditionalAccessSupport -------------------------------------------

// CA Enable Ids:

#define CAEI_POSSIBLE                  0x01
#define CAEI_POSSIBLE_COND_PURCHASE    0x02
#define CAEI_POSSIBLE_COND_TECHNICAL   0x03
#define CAEI_NOT_POSSIBLE_ENTITLEMENT  0x71
#define CAEI_NOT_POSSIBLE_TECHNICAL    0x73

#define CA_ENABLE_FLAG                 0x80

#define CA_ENABLE(x) (((x) & CA_ENABLE_FLAG) ? (x) & ~CA_ENABLE_FLAG : 0)

#define QUERY_WAIT_TIME      1000 // ms to wait before sending a query
#define QUERY_REPLY_TIMEOUT  2000 // ms to wait for a reply to a query

class cCiConditionalAccessSupport : public cCiSession {
private:
  int state;
  int numCaSystemIds;
  int caSystemIds[MAXCASYSTEMIDS + 1]; // list is zero terminated!
  bool repliesToQuery;
  cTimeMs timer;
public:
  cCiConditionalAccessSupport(uint16_t SessionId, cCiTransportConnection *Tc);
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  const int *GetCaSystemIds(void) { return caSystemIds; }
  void SendPMT(cCiCaPmt *CaPmt);
  bool RepliesToQuery(void) { return repliesToQuery; }
  bool Ready(void) { return state >= 4; }
  bool ReceivedReply(void) { return state >= 5; }
  bool CanDecrypt(void) { return state == 6; }
  };

cCiConditionalAccessSupport::cCiConditionalAccessSupport(uint16_t SessionId, cCiTransportConnection *Tc)
:cCiSession(SessionId, RI_CONDITIONAL_ACCESS_SUPPORT, Tc)
{
  dbgprotocol("Slot %d: new Conditional Access Support (session id %d)\n", Tc->CamSlot()->SlotNumber(), SessionId);
  state = 0; // inactive
  caSystemIds[numCaSystemIds = 0] = 0;
  repliesToQuery = false;
}

void cCiConditionalAccessSupport::Process(int Length, const uint8_t *Data)
{
  if (Data) {
     int Tag = GetTag(Length, &Data);
     switch (Tag) {
       case AOT_CA_INFO: {
            dbgprotocol("Slot %d: <== Ca Info (%d)", Tc()->CamSlot()->SlotNumber(), SessionId());
            cString Ids;
            numCaSystemIds = 0;
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            while (l > 1) {
                  uint16_t id = ((uint16_t)(*d) << 8) | *(d + 1);
                  Ids = cString::sprintf("%s %04X", *Ids ? *Ids : "", id);
                  dbgprotocol(" %04X", id);
                  d += 2;
                  l -= 2;
                  if (numCaSystemIds < MAXCASYSTEMIDS)
                     caSystemIds[numCaSystemIds++] = id;
                  else {
                     esyslog("ERROR: CAM %d: too many CA system IDs!", Tc()->CamSlot()->SlotNumber());
                     break;
                     }
                  }
            caSystemIds[numCaSystemIds] = 0;
            dbgprotocol("\n");
            if (state == 1) {
               timer.Set(QUERY_WAIT_TIME); // WORKAROUND: Alphacrypt 3.09 doesn't reply to QUERY immediately after reset
               state = 2; // got ca info
               }
            dsyslog("CAM %d: system ids:%s", Tc()->CamSlot()->SlotNumber(), *Ids ? *Ids : " none");
            }
            break;
       case AOT_CA_PMT_REPLY: {
            dbgprotocol("Slot %d: <== Ca Pmt Reply (%d)", Tc()->CamSlot()->SlotNumber(), SessionId());
            if (!repliesToQuery) {
               dsyslog("CAM %d: replies to QUERY - multi channel decryption possible", Tc()->CamSlot()->SlotNumber());
               repliesToQuery = true;
               }
            state = 5; // got ca pmt reply
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 1) {
               uint16_t pnr = ((uint16_t)(*d) << 8) | *(d + 1);
               dbgprotocol(" %d", pnr);
               d += 2;
               l -= 2;
               if (l > 0) {
                  dbgprotocol(" %02X", *d);
                  d += 1;
                  l -= 1;
                  if (l > 0) {
                     if (l % 3 == 0 && l > 1) {
                        // The EN50221 standard defines that the next byte is supposed
                        // to be the CA_enable value at programme level. However, there are
                        // CAMs (for instance the AlphaCrypt with firmware <= 3.05) that
                        // insert a two byte length field here.
                        // This is a workaround to skip this length field:
                        uint16_t len = ((uint16_t)(*d) << 8) | *(d + 1);
                        if (len == l - 2) {
                           d += 2;
                           l -= 2;
                           }
                        }
                     unsigned char caepl = *d;
                     dbgprotocol(" %02X", caepl);
                     d += 1;
                     l -= 1;
                     bool ok = true;
                     if (l <= 2)
                        ok = CA_ENABLE(caepl) == CAEI_POSSIBLE;
                     while (l > 2) {
                           uint16_t pid = ((uint16_t)(*d) << 8) | *(d + 1);
                           unsigned char caees = *(d + 2);
                           dbgprotocol(" %d=%02X", pid, caees);
                           d += 3;
                           l -= 3;
                           if (CA_ENABLE(caees) != CAEI_POSSIBLE)
                              ok = false;
                           }
                     if (ok)
                        state = 6; // descrambling possible
                     }
                  }
               }
            dbgprotocol("\n");
            }
            break;
       default: esyslog("ERROR: CAM %d: conditional access support: unknown tag %06X", Tc()->CamSlot()->SlotNumber(), Tag);
       }
     }
  else if (state == 0) {
     dbgprotocol("Slot %d: ==> Ca Info Enq (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
     SendData(AOT_CA_INFO_ENQ);
     state = 1; // enquired ca info
     }
  else if (state == 2 && timer.TimedOut()) {
     cCiCaPmt CaPmt(CPCI_QUERY, 0, 0, 0, NULL);
     SendPMT(&CaPmt);
     timer.Set(QUERY_REPLY_TIMEOUT);
     state = 3; // waiting for reply
     }
  else if (state == 3 && timer.TimedOut()) {
     dsyslog("CAM %d: doesn't reply to QUERY - only a single channel can be decrypted", Tc()->CamSlot()->SlotNumber());
     state = 4; // normal operation
     }
}

void cCiConditionalAccessSupport::SendPMT(cCiCaPmt *CaPmt)
{
  if (CaPmt && state >= 2) {
     dbgprotocol("Slot %d: ==> Ca Pmt (%d) %d %d\n", Tc()->CamSlot()->SlotNumber(), SessionId(), CaPmt->ListManagement(), CaPmt->CmdId());
     SendData(AOT_CA_PMT, CaPmt->length, CaPmt->capmt);
     state = 4; // sent ca pmt
     }
}

// --- cCiDateTime -----------------------------------------------------------

class cCiDateTime : public cCiSession {
private:
  int interval;
  time_t lastTime;
  void SendDateTime(void);
public:
  cCiDateTime(uint16_t SessionId, cCiTransportConnection *Tc);
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  };

cCiDateTime::cCiDateTime(uint16_t SessionId, cCiTransportConnection *Tc)
:cCiSession(SessionId, RI_DATE_TIME, Tc)
{
  interval = 0;
  lastTime = 0;
  dbgprotocol("Slot %d: new Date Time (session id %d)\n", Tc->CamSlot()->SlotNumber(), SessionId);
}

void cCiDateTime::SendDateTime(void)
{
  time_t t = time(NULL);
  struct tm tm_gmt;
  struct tm tm_loc;
  if (gmtime_r(&t, &tm_gmt) && localtime_r(&t, &tm_loc)) {
     int Y = tm_gmt.tm_year;
     int M = tm_gmt.tm_mon + 1;
     int D = tm_gmt.tm_mday;
     int L = (M == 1 || M == 2) ? 1 : 0;
     int MJD = 14956 + D + int((Y - L) * 365.25) + int((M + 1 + L * 12) * 30.6001);
#define DEC2BCD(d) uint8_t(((d / 10) << 4) + (d % 10))
#pragma pack(1)
     struct tTime { uint16_t mjd; uint8_t h, m, s; short offset; };
#pragma pack()
     tTime T = { mjd : htons(MJD), h : DEC2BCD(tm_gmt.tm_hour), m : DEC2BCD(tm_gmt.tm_min), s : DEC2BCD(tm_gmt.tm_sec), offset : short(htons(tm_loc.tm_gmtoff / 60)) };
     bool OldDumpTPDUDataTransfer = DumpTPDUDataTransfer;
     DumpTPDUDataTransfer &= DumpDateTime;
     if (DumpDateTime)
        dbgprotocol("Slot %d: ==> Date Time (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
     SendData(AOT_DATE_TIME, 7, (uint8_t*)&T);
     DumpTPDUDataTransfer = OldDumpTPDUDataTransfer;
     }
}

void cCiDateTime::Process(int Length, const uint8_t *Data)
{
  if (Data) {
     int Tag = GetTag(Length, &Data);
     switch (Tag) {
       case AOT_DATE_TIME_ENQ: {
            interval = 0;
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 0)
               interval = *d;
            dbgprotocol("Slot %d: <== Date Time Enq (%d), interval = %d\n", Tc()->CamSlot()->SlotNumber(), SessionId(), interval);
            lastTime = time(NULL);
            SendDateTime();
            }
            break;
       default: esyslog("ERROR: CAM %d: date time: unknown tag %06X", Tc()->CamSlot()->SlotNumber(), Tag);
       }
     }
  else if (interval && time(NULL) - lastTime > interval) {
     lastTime = time(NULL);
     SendDateTime();
     }
}

// --- cCiMMI ----------------------------------------------------------------

// Display Control Commands:

#define DCC_SET_MMI_MODE                          0x01
#define DCC_DISPLAY_CHARACTER_TABLE_LIST          0x02
#define DCC_INPUT_CHARACTER_TABLE_LIST            0x03
#define DCC_OVERLAY_GRAPHICS_CHARACTERISTICS      0x04
#define DCC_FULL_SCREEN_GRAPHICS_CHARACTERISTICS  0x05

// MMI Modes:

#define MM_HIGH_LEVEL                      0x01
#define MM_LOW_LEVEL_OVERLAY_GRAPHICS      0x02
#define MM_LOW_LEVEL_FULL_SCREEN_GRAPHICS  0x03

// Display Reply IDs:

#define DRI_MMI_MODE_ACK                              0x01
#define DRI_LIST_DISPLAY_CHARACTER_TABLES             0x02
#define DRI_LIST_INPUT_CHARACTER_TABLES               0x03
#define DRI_LIST_GRAPHIC_OVERLAY_CHARACTERISTICS      0x04
#define DRI_LIST_FULL_SCREEN_GRAPHIC_CHARACTERISTICS  0x05
#define DRI_UNKNOWN_DISPLAY_CONTROL_CMD               0xF0
#define DRI_UNKNOWN_MMI_MODE                          0xF1
#define DRI_UNKNOWN_CHARACTER_TABLE                   0xF2

// Enquiry Flags:

#define EF_BLIND  0x01

// Answer IDs:

#define AI_CANCEL  0x00
#define AI_ANSWER  0x01

class cCiMMI : public cCiSession {
private:
  char *GetText(int &Length, const uint8_t **Data);
  cCiMenu *menu, *fetchedMenu;
  cCiEnquiry *enquiry, *fetchedEnquiry;
public:
  cCiMMI(uint16_t SessionId, cCiTransportConnection *Tc);
  virtual ~cCiMMI();
  virtual void Process(int Length = 0, const uint8_t *Data = NULL);
  virtual bool HasUserIO(void) { return menu || enquiry; }
  cCiMenu *Menu(bool Clear = false);
  cCiEnquiry *Enquiry(bool Clear = false);
  void SendMenuAnswer(uint8_t Selection);
  bool SendAnswer(const char *Text);
  bool SendCloseMMI(void);
  };

cCiMMI::cCiMMI(uint16_t SessionId, cCiTransportConnection *Tc)
:cCiSession(SessionId, RI_MMI, Tc)
{
  dbgprotocol("Slot %d: new MMI (session id %d)\n", Tc->CamSlot()->SlotNumber(), SessionId);
  menu = fetchedMenu = NULL;
  enquiry = fetchedEnquiry = NULL;
}

cCiMMI::~cCiMMI()
{
  if (fetchedMenu) {
     cMutexLock MutexLock(fetchedMenu->mutex);
     fetchedMenu->mmi = NULL;
     }
  delete menu;
  if (fetchedEnquiry) {
     cMutexLock MutexLock(fetchedEnquiry->mutex);
     fetchedEnquiry->mmi = NULL;
     }
  delete enquiry;
}

char *cCiMMI::GetText(int &Length, const uint8_t **Data)
///< Gets the text at Data.
///< Returns a pointer to a newly allocated string, or NULL in case of error.
///< Upon return Length and Data represent the remaining data after the text has been skipped.
{
  int Tag = GetTag(Length, Data);
  if (Tag == AOT_TEXT_LAST) {
     char *s = GetString(Length, Data);
     dbgprotocol("Slot %d: <== Text Last (%d) '%s'\n", Tc()->CamSlot()->SlotNumber(), SessionId(), s);
     return s;
     }
  else
     esyslog("ERROR: CAM %d: MMI: unexpected text tag: %06X", Tc()->CamSlot()->SlotNumber(), Tag);
  return NULL;
}

void cCiMMI::Process(int Length, const uint8_t *Data)
{
  if (Data) {
     int Tag = GetTag(Length, &Data);
     switch (Tag) {
       case AOT_DISPLAY_CONTROL: {
            dbgprotocol("Slot %d: <== Display Control (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 0) {
               switch (*d) {
                 case DCC_SET_MMI_MODE:
                      if (l == 2 && *++d == MM_HIGH_LEVEL) {
                         struct tDisplayReply { uint8_t id; uint8_t mode; };
                         tDisplayReply dr = { id : DRI_MMI_MODE_ACK, mode : MM_HIGH_LEVEL };
                         dbgprotocol("Slot %d: ==> Display Reply (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
                         SendData(AOT_DISPLAY_REPLY, 2, (uint8_t *)&dr);
                         }
                      break;
                 default: esyslog("ERROR: CAM %d: MMI: unsupported display control command %02X", Tc()->CamSlot()->SlotNumber(), *d);
                 }
               }
            }
            break;
       case AOT_LIST_LAST:
       case AOT_MENU_LAST: {
            dbgprotocol("Slot %d: <== Menu Last (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            delete menu;
            menu = new cCiMenu(this, Tag == AOT_MENU_LAST);
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 0) {
               // since the specification allows choiceNb to be undefined it is useless, so let's just skip it:
               d++;
               l--;
               if (l > 0) menu->titleText = GetText(l, &d);
               if (l > 0) menu->subTitleText = GetText(l, &d);
               if (l > 0) menu->bottomText = GetText(l, &d);
               while (l > 0) {
                     char *s = GetText(l, &d);
                     if (s) {
                        if (!menu->AddEntry(s))
                           free(s);
                        }
                     else
                        break;
                     }
               }
            }
            break;
       case AOT_ENQ: {
            dbgprotocol("Slot %d: <== Enq (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
            delete enquiry;
            enquiry = new cCiEnquiry(this);
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 0) {
               uint8_t blind = *d++;
               //XXX GetByte()???
               l--;
               enquiry->blind = blind & EF_BLIND;
               enquiry->expectedLength = *d++;
               l--;
               // I really wonder why there is no text length field here...
               enquiry->text = CopyString(l, d);
               }
            }
            break;
       case AOT_CLOSE_MMI: {
            int id = -1;
            int delay = -1;
            int l = 0;
            const uint8_t *d = GetData(Data, l);
            if (l > 0) {
               id = *d++;
               if (l > 1)
                  delay = *d;
               }
            dbgprotocol("Slot %d: <== Close MMI (%d)  id = %02X  delay = %d\n", Tc()->CamSlot()->SlotNumber(), SessionId(), id, delay);
            }
            break;
       default: esyslog("ERROR: CAM %d: MMI: unknown tag %06X", Tc()->CamSlot()->SlotNumber(), Tag);
       }
     }
}

cCiMenu *cCiMMI::Menu(bool Clear)
{
  if (Clear)
     fetchedMenu = NULL;
  else if (menu) {
     fetchedMenu = menu;
     menu = NULL;
     }
  return fetchedMenu;
}

cCiEnquiry *cCiMMI::Enquiry(bool Clear)
{
  if (Clear)
     fetchedEnquiry = NULL;
  else if (enquiry) {
     fetchedEnquiry = enquiry;
     enquiry = NULL;
     }
  return fetchedEnquiry;
}

void cCiMMI::SendMenuAnswer(uint8_t Selection)
{
  dbgprotocol("Slot %d: ==> Menu Answ (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
  SendData(AOT_MENU_ANSW, 1, &Selection);
}

bool cCiMMI::SendAnswer(const char *Text)
{
  dbgprotocol("Slot %d: ==> Answ (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
  struct tAnswer { uint8_t id; char text[256]; };//XXX
  tAnswer answer;
  answer.id = Text ? AI_ANSWER : AI_CANCEL;
  if (Text)
     strncpy(answer.text, Text, sizeof(answer.text));
  SendData(AOT_ANSW, Text ? strlen(Text) + 1 : 1, (uint8_t *)&answer);
  return true;
}

bool cCiMMI::SendCloseMMI(void)
{
  dbgprotocol("Slot %d: ==> Close MMI (%d)\n", Tc()->CamSlot()->SlotNumber(), SessionId());
  SendData(AOT_CLOSE_MMI, 0);
  return true;
}

// --- cCiMenu ---------------------------------------------------------------

cCiMenu::cCiMenu(cCiMMI *MMI, bool Selectable)
{
  mmi = MMI;
  mutex = NULL;
  selectable = Selectable;
  titleText = subTitleText = bottomText = NULL;
  numEntries = 0;
}

cCiMenu::~cCiMenu()
{
  cMutexLock MutexLock(mutex);
  if (mmi)
     mmi->Menu(true);
  free(titleText);
  free(subTitleText);
  free(bottomText);
  for (int i = 0; i < numEntries; i++)
      free(entries[i]);
}

bool cCiMenu::AddEntry(char *s)
{
  if (numEntries < MAX_CIMENU_ENTRIES) {
     entries[numEntries++] = s;
     return true;
     }
  return false;
}

bool cCiMenu::HasUpdate(void)
{
  // If the mmi is gone, the menu shall be closed, which also qualifies as 'update'.
  return !mmi || mmi->HasUserIO();
}

void cCiMenu::Select(int Index)
{
  cMutexLock MutexLock(mutex);
  if (mmi && -1 <= Index && Index < numEntries)
     mmi->SendMenuAnswer(Index + 1);
}

void cCiMenu::Cancel(void)
{
  Select(-1);
}

void cCiMenu::Abort(void)
{
  cMutexLock MutexLock(mutex);
  if (mmi)
     mmi->SendCloseMMI();
}

// --- cCiEnquiry ------------------------------------------------------------

cCiEnquiry::cCiEnquiry(cCiMMI *MMI)
{
  mmi = MMI;
  text = NULL;
  blind = false;
  expectedLength = 0;
}

cCiEnquiry::~cCiEnquiry()
{
  cMutexLock MutexLock(mutex);
  if (mmi)
     mmi->Enquiry(true);
  free(text);
}

void cCiEnquiry::Reply(const char *s)
{
  cMutexLock MutexLock(mutex);
  if (mmi)
     mmi->SendAnswer(s);
}

void cCiEnquiry::Cancel(void)
{
  Reply(NULL);
}

void cCiEnquiry::Abort(void)
{
  cMutexLock MutexLock(mutex);
  if (mmi)
     mmi->SendCloseMMI();
}

// --- cCiTransportConnection (cont'd) ---------------------------------------

#define TC_POLL_TIMEOUT   300 // ms WORKAROUND: TC_POLL_TIMEOUT < 300ms doesn't work with DragonCAM
#define TC_ALIVE_TIMEOUT 2000 // ms after which a transport connection is assumed dead

cCiTransportConnection::cCiTransportConnection(cCamSlot *CamSlot, uint8_t Tcid)
{
  dbgprotocol("Slot %d: creating connection %d/%d\n", CamSlot->SlotNumber(), CamSlot->SlotIndex(), Tcid);
  camSlot = CamSlot;
  tcid = Tcid;
  state = stIDLE;
  createConnectionRequested = false;
  deleteConnectionRequested = false;
  hasUserIO = false;
  alive.Set(TC_ALIVE_TIMEOUT);
  for (int i = 0; i <= MAX_SESSIONS_PER_TC; i++) // sessions[0] is not used, but initialized anyway
      sessions[i] = NULL;
}

cCiTransportConnection::~cCiTransportConnection()
{
  for (int i = 1; i <= MAX_SESSIONS_PER_TC; i++)
      delete sessions[i];
}

bool cCiTransportConnection::Ready(void)
{
  cCiConditionalAccessSupport *cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT);
  return cas && cas->Ready();
}

const char *cCiTransportConnection::GetCamName(void)
{
  cCiApplicationInformation *ai = (cCiApplicationInformation *)GetSessionByResourceId(RI_APPLICATION_INFORMATION);
  return ai ? ai->GetMenuString() : NULL;
}

void cCiTransportConnection::SendTPDU(uint8_t Tag, int Length, const uint8_t *Data)
{
  cTPDU TPDU(camSlot->SlotIndex(), tcid, Tag, Length, Data);
  camSlot->Write(&TPDU);
  timer.Set(TC_POLL_TIMEOUT);
}

void cCiTransportConnection::SendData(int Length, const uint8_t *Data)
{
  // if Length ever exceeds MAX_TPDU_DATA this needs to be handled differently
  if (state == stACTIVE && Length > 0)
     SendTPDU(T_DATA_LAST, Length, Data);
}

void cCiTransportConnection::SendTag(uint8_t Tag, uint16_t SessionId, uint32_t ResourceId, int Status)
{
  uint8_t buffer[16];
  uint8_t *p = buffer;
  *p++ = Tag;
  *p++ = 0x00; // will contain length
  if (Status >= 0)
     *p++ = Status;
  if (ResourceId) {
     put_unaligned(htonl(ResourceId), (uint32_t *)p);
     p += 4;
     }
  put_unaligned(htons(SessionId), (uint16_t *)p);
  p += 2;
  buffer[1] = p - buffer - 2; // length
  SendData(p - buffer, buffer);
}

void cCiTransportConnection::Poll(void)
{
  bool OldDumpTPDUDataTransfer = DumpTPDUDataTransfer;
  DumpTPDUDataTransfer &= DumpPolls;
  if (DumpPolls)
     dbgprotocol("Slot %d: ==> Poll\n", camSlot->SlotNumber());
  SendTPDU(T_DATA_LAST);
  DumpTPDUDataTransfer = OldDumpTPDUDataTransfer;
}

uint32_t cCiTransportConnection::ResourceIdToInt(const uint8_t *Data)
{
  return (ntohl(get_unaligned((uint32_t *)Data)));
}

cCiSession *cCiTransportConnection::GetSessionBySessionId(uint16_t SessionId)
{
  return (SessionId <= MAX_SESSIONS_PER_TC) ? sessions[SessionId] : NULL;
}

cCiSession *cCiTransportConnection::GetSessionByResourceId(uint32_t ResourceId)
{
  for (int i = 1; i <= MAX_SESSIONS_PER_TC; i++) {
      if (sessions[i] && sessions[i]->ResourceId() == ResourceId)
         return sessions[i];
      }
  return NULL;
}

void cCiTransportConnection::OpenSession(int Length, const uint8_t *Data)
{
  if (Length == 6 && *(Data + 1) == 0x04) {
     uint32_t ResourceId = ResourceIdToInt(Data + 2);
     dbgprotocol("Slot %d: open session %08X\n", camSlot->SlotNumber(), ResourceId);
     if (!GetSessionByResourceId(ResourceId)) {
        for (int i = 1; i <= MAX_SESSIONS_PER_TC; i++) {
            if (!sessions[i]) {
               switch (ResourceId) {
                 case RI_RESOURCE_MANAGER:           sessions[i] = new cCiResourceManager(i, this); break;
                 case RI_APPLICATION_INFORMATION:    sessions[i] = new cCiApplicationInformation(i, this); break;
                 case RI_CONDITIONAL_ACCESS_SUPPORT: sessions[i] = new cCiConditionalAccessSupport(i, this); break;
                 case RI_DATE_TIME:                  sessions[i] = new cCiDateTime(i, this); break;
                 case RI_MMI:                        sessions[i] = new cCiMMI(i, this); break;
                 case RI_HOST_CONTROL:               // not implemented
                 default: esyslog("ERROR: CAM %d: unknown resource identifier: %08X (%d/%d)", camSlot->SlotNumber(), ResourceId, camSlot->SlotIndex(), tcid);
                 }
               if (sessions[i])
                  SendTag(ST_OPEN_SESSION_RESPONSE, sessions[i]->SessionId(), sessions[i]->ResourceId(), SS_OK);
               return;
               }
            }
        esyslog("ERROR: CAM %d: no free session slot for resource identifier %08X (%d/%d)", camSlot->SlotNumber(), ResourceId, camSlot->SlotIndex(), tcid);
        }
     else
        esyslog("ERROR: CAM %d: session for resource identifier %08X already exists (%d/%d)", camSlot->SlotNumber(), ResourceId, camSlot->SlotIndex(), tcid);
     }
}

void cCiTransportConnection::CloseSession(uint16_t SessionId)
{
  dbgprotocol("Slot %d: close session %d\n", camSlot->SlotNumber(), SessionId);
  cCiSession *Session = GetSessionBySessionId(SessionId);
  if (Session && sessions[SessionId] == Session) {
     delete Session;
     sessions[SessionId] = NULL;
     SendTag(ST_CLOSE_SESSION_RESPONSE, SessionId, 0, SS_OK);
     }
  else {
     esyslog("ERROR: CAM %d: unknown session id: %d (%d/%d)", camSlot->SlotNumber(), SessionId, camSlot->SlotIndex(), tcid);
     SendTag(ST_CLOSE_SESSION_RESPONSE, SessionId, 0, SS_NOT_ALLOCATED);
     }
}

void cCiTransportConnection::HandleSessions(cTPDU *TPDU)
{
  int Length;
  const uint8_t *Data = TPDU->Data(Length);
  if (Data && Length > 1) {
     switch (*Data) {
       case ST_SESSION_NUMBER:          if (Length > 4) {
                                           uint16_t SessionId = ntohs(get_unaligned((uint16_t *)&Data[2]));
                                           cCiSession *Session = GetSessionBySessionId(SessionId);
                                           if (Session)
                                              Session->Process(Length - 4, Data + 4);
                                           else
                                              esyslog("ERROR: CAM %d: unknown session id: %d (%d/%d)", camSlot->SlotNumber(), SessionId, camSlot->SlotIndex(), tcid);
                                           }
                                        break;
       case ST_OPEN_SESSION_REQUEST:    OpenSession(Length, Data);
                                        break;
       case ST_CLOSE_SESSION_REQUEST:   if (Length == 4)
                                           CloseSession(ntohs(get_unaligned((uint16_t *)&Data[2])));
                                        break;
       case ST_CREATE_SESSION_RESPONSE: // not implemented
       case ST_CLOSE_SESSION_RESPONSE:  // not implemented
       default: esyslog("ERROR: CAM %d: unknown session tag: %02X (%d/%d)", camSlot->SlotNumber(), *Data, camSlot->SlotIndex(), tcid);
       }
     }
}

bool cCiTransportConnection::Process(cTPDU *TPDU)
{
  if (TPDU)
     alive.Set(TC_ALIVE_TIMEOUT);
  else if (alive.TimedOut())
     return false;
  switch (state) {
    case stIDLE:
         if (createConnectionRequested) {
            dbgprotocol("Slot %d: create connection %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
            createConnectionRequested = false;
            SendTPDU(T_CREATE_TC);
            state = stCREATION;
            }
         return true;
    case stCREATION:
         if (TPDU && TPDU->Tag() == T_CTC_REPLY) {
            dbgprotocol("Slot %d: connection created %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
            Poll();
            state = stACTIVE;
            }
         else if (timer.TimedOut()) {
            dbgprotocol("Slot %d: timeout while creating connection %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
            state = stIDLE;
            }
         return true;
    case stACTIVE:
         if (deleteConnectionRequested) {
            dbgprotocol("Slot %d: delete connection requested %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
            deleteConnectionRequested = false;
            SendTPDU(T_DELETE_TC);
            state = stDELETION;
            return true;
            }
         if (TPDU) {
            switch (TPDU->Tag()) {
              case T_REQUEST_TC:
                   esyslog("ERROR: CAM %d: T_REQUEST_TC not implemented (%d/%d)", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
                   break;
              case T_DATA_MORE:
              case T_DATA_LAST:
                   HandleSessions(TPDU);
                   // continue with T_SB
              case T_SB:
                   if ((TPDU->Status() & DATA_INDICATOR) != 0) {
                      dbgprotocol("Slot %d: receive data %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
                      SendTPDU(T_RCV);
                      }
                   break;
              case T_DELETE_TC:
                   dbgprotocol("Slot %d: delete connection %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
                   SendTPDU(T_DTC_REPLY);
                   state = stIDLE;
                   return true;
              case T_RCV:
              case T_CREATE_TC:
              case T_CTC_REPLY:
              case T_DTC_REPLY:
              case T_NEW_TC:
              case T_TC_ERROR:
                   break;
              default:
                   esyslog("ERROR: unknown TPDU tag: 0x%02X (%s)", TPDU->Tag(), __FUNCTION__);
              }
            }
         else if (timer.TimedOut())
            Poll();
         hasUserIO = false;
         for (int i = 1; i <= MAX_SESSIONS_PER_TC; i++) {
             if (sessions[i]) {
                sessions[i]->Process();
                if (sessions[i]->HasUserIO())
                   hasUserIO = true;
                }
             }
         break;
    case stDELETION:
         if (TPDU && TPDU->Tag() == T_DTC_REPLY || timer.TimedOut()) {
            dbgprotocol("Slot %d: connection deleted %d/%d\n", camSlot->SlotNumber(), camSlot->SlotIndex(), tcid);
            state = stIDLE;
            }
         return true;
    default:
         esyslog("ERROR: unknown state: %d (%s)", state, __FUNCTION__);
    }
  return true;
}

// --- cCiCaPidData ----------------------------------------------------------

class cCiCaPidData : public cListObject {
public:
  bool active;
  int pid;
  int streamType;
  cCiCaPidData(int Pid, int StreamType)
  {
    active = false;
    pid = Pid;
    streamType = StreamType;
  }
  };

// --- cCiCaProgramData ------------------------------------------------------

class cCiCaProgramData : public cListObject {
public:
  int programNumber;
  bool modified;
  cList<cCiCaPidData> pidList;
  cCiCaProgramData(int ProgramNumber)
  {
    programNumber = ProgramNumber;
    modified = false;
  }
  };

// --- cCiAdapter ------------------------------------------------------------

cCiAdapter::cCiAdapter(void)
:cThread("CI adapter")
{
  for (int i = 0; i < MAX_CAM_SLOTS_PER_ADAPTER; i++)
      camSlots[i] = NULL;
}

cCiAdapter::~cCiAdapter()
{
  Cancel(3);
  for (int i = 0; i < MAX_CAM_SLOTS_PER_ADAPTER; i++)
      delete camSlots[i];
}

void cCiAdapter::AddCamSlot(cCamSlot *CamSlot)
{
  if (CamSlot) {
     for (int i = 0; i < MAX_CAM_SLOTS_PER_ADAPTER; i++) {
         if (!camSlots[i]) {
            CamSlot->slotIndex = i;
            camSlots[i] = CamSlot;
            return;
            }
        }
     esyslog("ERROR: no free CAM slot in CI adapter");
     }
}

cCamSlot *cCiAdapter::ItCamSlot(int &Iter)
{
  if (Iter >= 0) {
     for (; Iter < MAX_CAM_SLOTS_PER_ADAPTER; ) {
         if (cCamSlot *Found = camSlots[Iter++])
            return Found;
         }
     }
  return NULL;
}

void cCiAdapter::Action(void)
{
  cTPDU TPDU;
  while (Running()) {
        int n = Read(TPDU.Buffer(), TPDU.MaxSize());
        if (n > 0 && TPDU.Slot() < MAX_CAM_SLOTS_PER_ADAPTER) {
           TPDU.SetSize(n);
           cCamSlot *cs = camSlots[TPDU.Slot()];
           TPDU.Dump(cs ? cs->SlotNumber() : 0, false);
           if (cs)
              cs->Process(&TPDU);
           }
        for (int i = 0; i < MAX_CAM_SLOTS_PER_ADAPTER; i++) {
            if (camSlots[i])
               camSlots[i]->Process();
            }
        }
}

// --- cCamSlot --------------------------------------------------------------

#define MODULE_CHECK_INTERVAL 500 // ms
#define MODULE_RESET_TIMEOUT    2 // s

cCamSlot::cCamSlot(cCiAdapter *CiAdapter, bool ReceiveCaPids)
{
  ciAdapter = CiAdapter;
  assignedDevice = NULL;
  caPidReceiver = ReceiveCaPids ? new cCaPidReceiver : NULL;
  caActivationReceiver = NULL;
  slotIndex = -1;
  lastModuleStatus = msReset; // avoids initial reset log message
  resetTime = 0;
  resendPmt = false;
  source = transponder = 0;
  for (int i = 0; i <= MAX_CONNECTIONS_PER_CAM_SLOT; i++) // tc[0] is not used, but initialized anyway
      tc[i] = NULL;
  CamSlots.Add(this);
  slotNumber = Index() + 1;
  if (ciAdapter)
     ciAdapter->AddCamSlot(this);
  Reset();
}

cCamSlot::~cCamSlot()
{
  if (assignedDevice)
     assignedDevice->SetCamSlot(NULL);
  delete caPidReceiver;
  delete caActivationReceiver;
  CamSlots.Del(this, false);
  DeleteAllConnections();
}

bool cCamSlot::Assign(cDevice *Device, bool Query)
{
  cMutexLock MutexLock(&mutex);
  if (ciAdapter) {
     if (ciAdapter->Assign(Device, true)) {
        if (!Device && assignedDevice)
           assignedDevice->SetCamSlot(NULL);
        if (!Query || !Device) {
           StopDecrypting();
           source = transponder = 0;
           if (ciAdapter->Assign(Device)) {
              assignedDevice = Device;
              if (Device) {
                 Device->SetCamSlot(this);
                 dsyslog("CAM %d: assigned to device %d", slotNumber, Device->DeviceNumber() + 1);
                 }
              else {
                 CancelActivation();
                 dsyslog("CAM %d: unassigned", slotNumber);
                 }
              }
           else
              return false;
           }
        return true;
        }
     }
  return false;
}

void cCamSlot::NewConnection(void)
{
  cMutexLock MutexLock(&mutex);
  for (int i = 1; i <= MAX_CONNECTIONS_PER_CAM_SLOT; i++) {
      if (!tc[i]) {
         tc[i] = new cCiTransportConnection(this, i);
         tc[i]->CreateConnection();
         return;
         }
      }
  esyslog("ERROR: CAM %d: can't create new transport connection!", slotNumber);
}

void cCamSlot::DeleteAllConnections(void)
{
  cMutexLock MutexLock(&mutex);
  for (int i = 1; i <= MAX_CONNECTIONS_PER_CAM_SLOT; i++) {
      delete tc[i];
      tc[i] = NULL;
      }
}

void cCamSlot::Process(cTPDU *TPDU)
{
  cMutexLock MutexLock(&mutex);
  if (caActivationReceiver && !caActivationReceiver->IsAttached())
     CancelActivation();
  if (TPDU) {
     int n = TPDU->Tcid();
     if (1 <= n && n <= MAX_CONNECTIONS_PER_CAM_SLOT) {
        if (tc[n])
           tc[n]->Process(TPDU);
        }
     }
  for (int i = 1; i <= MAX_CONNECTIONS_PER_CAM_SLOT; i++) {
      if (tc[i]) {
         if (!tc[i]->Process()) {
           Reset();
           return;
           }
         }
      }
  if (moduleCheckTimer.TimedOut()) {
     eModuleStatus ms = ModuleStatus();
     if (ms != lastModuleStatus) {
        switch (ms) {
          case msNone:
               dbgprotocol("Slot %d: no module present\n", slotNumber);
               isyslog("CAM %d: no module present", slotNumber);
               DeleteAllConnections();
               CancelActivation();
               break;
          case msReset:
               dbgprotocol("Slot %d: module reset\n", slotNumber);
               isyslog("CAM %d: module reset", slotNumber);
               DeleteAllConnections();
               break;
          case msPresent:
               dbgprotocol("Slot %d: module present\n", slotNumber);
               isyslog("CAM %d: module present", slotNumber);
               break;
          case msReady:
               dbgprotocol("Slot %d: module ready\n", slotNumber);
               isyslog("CAM %d: module ready", slotNumber);
               NewConnection();
               resendPmt = caProgramList.Count() > 0;
               break;
          default:
               esyslog("ERROR: unknown module status %d (%s)", ms, __FUNCTION__);
          }
        lastModuleStatus = ms;
        }
     moduleCheckTimer.Set(MODULE_CHECK_INTERVAL);
     }
  if (resendPmt)
     SendCaPmt(CPCI_OK_DESCRAMBLING);
  processed.Broadcast();
}

cCiSession *cCamSlot::GetSessionByResourceId(uint32_t ResourceId)
{
  cMutexLock MutexLock(&mutex);
  return tc[1] ? tc[1]->GetSessionByResourceId(ResourceId) : NULL;
}

void cCamSlot::Write(cTPDU *TPDU)
{
  cMutexLock MutexLock(&mutex);
  if (ciAdapter && TPDU->Size()) {
     TPDU->Dump(SlotNumber(), true);
     ciAdapter->Write(TPDU->Buffer(), TPDU->Size());
     }
}

bool cCamSlot::Reset(void)
{
  cMutexLock MutexLock(&mutex);
  ChannelCamRelations.Reset(slotNumber);
  DeleteAllConnections();
  if (ciAdapter) {
     dbgprotocol("Slot %d: reset...", slotNumber);
     if (ciAdapter->Reset(slotIndex)) {
        resetTime = time(NULL);
        dbgprotocol("ok.\n");
        lastModuleStatus = msReset;
        return true;
        }
     dbgprotocol("failed!\n");
     }
  return false;
}

bool cCamSlot::CanActivate(void)
{
  return ModuleStatus() == msReady;
}

void cCamSlot::StartActivation(void)
{
  cMutexLock MutexLock(&mutex);
  if (!caActivationReceiver) {
     if (cDevice *d = Device()) {
        LOCK_CHANNELS_READ;
        if (const cChannel *Channel = Channels->GetByNumber(cDevice::CurrentChannel())) {
           caActivationReceiver = new cCaActivationReceiver(Channel, this);
           d->AttachReceiver(caActivationReceiver);
           dsyslog("CAM %d: activating on device %d with channel %d (%s)", SlotNumber(), d->DeviceNumber() + 1, Channel->Number(), Channel->Name());
           }
        }
     }
}

void cCamSlot::CancelActivation(void)
{
  cMutexLock MutexLock(&mutex);
  delete caActivationReceiver;
  caActivationReceiver = NULL;
}

bool cCamSlot::IsActivating(void)
{
  return caActivationReceiver;
}

eModuleStatus cCamSlot::ModuleStatus(void)
{
  cMutexLock MutexLock(&mutex);
  eModuleStatus ms = ciAdapter ? ciAdapter->ModuleStatus(slotIndex) : msNone;
  if (resetTime) {
     if (ms <= msReset) {
        if (time(NULL) - resetTime < MODULE_RESET_TIMEOUT)
           return msReset;
        }
     resetTime = 0;
     }
  return ms;
}

const char *cCamSlot::GetCamName(void)
{
  cMutexLock MutexLock(&mutex);
  return tc[1] ? tc[1]->GetCamName() : NULL;
}

bool cCamSlot::Ready(void)
{
  cMutexLock MutexLock(&mutex);
  return ModuleStatus() == msNone || tc[1] && tc[1]->Ready();
}

bool cCamSlot::HasMMI(void)
{
  return GetSessionByResourceId(RI_MMI);
}

bool cCamSlot::HasUserIO(void)
{
  cMutexLock MutexLock(&mutex);
  return tc[1] && tc[1]->HasUserIO();
}

bool cCamSlot::EnterMenu(void)
{
  cMutexLock MutexLock(&mutex);
  cCiApplicationInformation *api = (cCiApplicationInformation *)GetSessionByResourceId(RI_APPLICATION_INFORMATION);
  return api ? api->EnterMenu() : false;
}

cCiMenu *cCamSlot::GetMenu(void)
{
  cMutexLock MutexLock(&mutex);
  cCiMMI *mmi = (cCiMMI *)GetSessionByResourceId(RI_MMI);
  if (mmi) {
     cCiMenu *Menu = mmi->Menu();
     if (Menu)
        Menu->mutex = &mutex;
     return Menu;
     }
  return NULL;
}

cCiEnquiry *cCamSlot::GetEnquiry(void)
{
  cMutexLock MutexLock(&mutex);
  cCiMMI *mmi = (cCiMMI *)GetSessionByResourceId(RI_MMI);
  if (mmi) {
     cCiEnquiry *Enquiry = mmi->Enquiry();
     if (Enquiry)
        Enquiry->mutex = &mutex;
     return Enquiry;
     }
  return NULL;
}

void cCamSlot::SendCaPmt(uint8_t CmdId)
{
  cMutexLock MutexLock(&mutex);
  cCiConditionalAccessSupport *cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT);
  if (cas) {
     const int *CaSystemIds = cas->GetCaSystemIds();
     if (CaSystemIds && *CaSystemIds) {
        if (caProgramList.Count()) {
           if (caPidReceiver && caPidReceiver->HasCaPids()) {
              if (cDevice *d = Device())
                 d->Detach(caPidReceiver);
              }
           for (int Loop = 1; Loop <= 2; Loop++) {
               for (cCiCaProgramData *p = caProgramList.First(); p; p = caProgramList.Next(p)) {
                   if (p->modified || resendPmt) {
                      bool Active = false;
                      cCiCaPmt CaPmt(CmdId, source, transponder, p->programNumber, CaSystemIds);
                      for (cCiCaPidData *q = p->pidList.First(); q; q = p->pidList.Next(q)) {
                          if (q->active) {
                             CaPmt.AddPid(q->pid, q->streamType);
                             Active = true;
                             }
                          }
                      if ((Loop == 1) != Active) { // first remove, then add
                         if (caPidReceiver) {
                            int CaPids[MAXRECEIVEPIDS + 1];
                            if (GetCaPids(source, transponder, p->programNumber, CaSystemIds, MAXRECEIVEPIDS + 1, CaPids) > 0) {
                               if (Loop == 1)
                                  caPidReceiver->DelPids(CaPids);
                               else
                                  caPidReceiver->AddPids(CaPids);
                               }
                            }
                         if (cas->RepliesToQuery())
                            CaPmt.SetListManagement(Active ? CPLM_ADD : CPLM_UPDATE);
                         if (Active || cas->RepliesToQuery())
                            cas->SendPMT(&CaPmt);
                         p->modified = false;
                         }
                      }
                   }
               }
           if (caPidReceiver && caPidReceiver->HasCaPids()) {
              if (cDevice *d = Device())
                 d->AttachReceiver(caPidReceiver);
              }
           resendPmt = false;
           }
        else {
           cCiCaPmt CaPmt(CmdId, 0, 0, 0, NULL);
           cas->SendPMT(&CaPmt);
           if (caPidReceiver) {
              if (cDevice *d = Device())
                 d->Detach(caPidReceiver);
              caPidReceiver->Reset();
              }
           }
        }
     }
}

const int *cCamSlot::GetCaSystemIds(void)
{
  cMutexLock MutexLock(&mutex);
  cCiConditionalAccessSupport *cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT);
  return cas ? cas->GetCaSystemIds() : NULL;
}

int cCamSlot::Priority(void)
{
  cDevice *d = Device();
  return d ? d->Priority() : IDLEPRIORITY;
}

bool cCamSlot::ProvidesCa(const int *CaSystemIds)
{
  cMutexLock MutexLock(&mutex);
  cCiConditionalAccessSupport *cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT);
  if (cas) {
     for (const int *ids = cas->GetCaSystemIds(); ids && *ids; ids++) {
         for (const int *id = CaSystemIds; *id; id++) {
             if (*id == *ids)
                return true;
             }
         }
     }
  return false;
}

void cCamSlot::AddPid(int ProgramNumber, int Pid, int StreamType)
{
  cMutexLock MutexLock(&mutex);
  cCiCaProgramData *ProgramData = NULL;
  for (cCiCaProgramData *p = caProgramList.First(); p; p = caProgramList.Next(p)) {
      if (p->programNumber == ProgramNumber) {
         ProgramData = p;
         for (cCiCaPidData *q = p->pidList.First(); q; q = p->pidList.Next(q)) {
             if (q->pid == Pid)
                return;
             }
         }
      }
  if (!ProgramData)
     caProgramList.Add(ProgramData = new cCiCaProgramData(ProgramNumber));
  ProgramData->pidList.Add(new cCiCaPidData(Pid, StreamType));
}

void cCamSlot::SetPid(int Pid, bool Active)
{
  cMutexLock MutexLock(&mutex);
  for (cCiCaProgramData *p = caProgramList.First(); p; p = caProgramList.Next(p)) {
      for (cCiCaPidData *q = p->pidList.First(); q; q = p->pidList.Next(q)) {
          if (q->pid == Pid) {
             if (q->active != Active) {
                q->active = Active;
                p->modified = true;
                }
             return;
             }
         }
      }
}

// see ISO/IEC 13818-1
#define STREAM_TYPE_VIDEO    0x02
#define STREAM_TYPE_AUDIO    0x04
#define STREAM_TYPE_PRIVATE  0x06

void cCamSlot::AddChannel(const cChannel *Channel)
{
  cMutexLock MutexLock(&mutex);
  if (source != Channel->Source() || transponder != Channel->Transponder())
     StopDecrypting();
  source = Channel->Source();
  transponder = Channel->Transponder();
  if (Channel->Ca() >= CA_ENCRYPTED_MIN) {
     AddPid(Channel->Sid(), Channel->Vpid(), STREAM_TYPE_VIDEO);
     for (const int *Apid = Channel->Apids(); *Apid; Apid++)
         AddPid(Channel->Sid(), *Apid, STREAM_TYPE_AUDIO);
     for (const int *Dpid = Channel->Dpids(); *Dpid; Dpid++)
         AddPid(Channel->Sid(), *Dpid, STREAM_TYPE_PRIVATE);
     for (const int *Spid = Channel->Spids(); *Spid; Spid++)
         AddPid(Channel->Sid(), *Spid, STREAM_TYPE_PRIVATE);
     }
}

#define QUERY_REPLY_WAIT  100 // ms to wait between checks for a reply

bool cCamSlot::CanDecrypt(const cChannel *Channel)
{
  if (Channel->Ca() < CA_ENCRYPTED_MIN)
     return true; // channel not encrypted
  if (!IsDecrypting())
     return true; // any CAM can decrypt at least one channel
  cMutexLock MutexLock(&mutex);
  cCiConditionalAccessSupport *cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT);
  if (cas && cas->RepliesToQuery()) {
     cCiCaPmt CaPmt(CPCI_QUERY, Channel->Source(), Channel->Transponder(), Channel->Sid(), GetCaSystemIds());
     CaPmt.SetListManagement(CPLM_ADD); // WORKAROUND: CPLM_ONLY doesn't work with Alphacrypt 3.09 (deletes existing CA_PMTs)
     CaPmt.AddPid(Channel->Vpid(), STREAM_TYPE_VIDEO);
     for (const int *Apid = Channel->Apids(); *Apid; Apid++)
         CaPmt.AddPid(*Apid, STREAM_TYPE_AUDIO);
     for (const int *Dpid = Channel->Dpids(); *Dpid; Dpid++)
         CaPmt.AddPid(*Dpid, STREAM_TYPE_PRIVATE);
     for (const int *Spid = Channel->Spids(); *Spid; Spid++)
         CaPmt.AddPid(*Spid, STREAM_TYPE_PRIVATE);
     cas->SendPMT(&CaPmt);
     cTimeMs Timeout(QUERY_REPLY_TIMEOUT);
     do {
        processed.TimedWait(mutex, QUERY_REPLY_WAIT);
        if ((cas = (cCiConditionalAccessSupport *)GetSessionByResourceId(RI_CONDITIONAL_ACCESS_SUPPORT)) != NULL) { // must re-fetch it, there might have been a reset
           if (cas->ReceivedReply())
              return cas->CanDecrypt();
           }
        else
           return false;
        } while (!Timeout.TimedOut());
     dsyslog("CAM %d: didn't reply to QUERY", SlotNumber());
     }
  return false;
}

void cCamSlot::StartDecrypting(void)
{
  SendCaPmt(CPCI_OK_DESCRAMBLING);
}

void cCamSlot::StopDecrypting(void)
{
  cMutexLock MutexLock(&mutex);
  if (caProgramList.Count()) {
     caProgramList.Clear();
     SendCaPmt(CPCI_NOT_SELECTED);
     }
}

bool cCamSlot::IsDecrypting(void)
{
  cMutexLock MutexLock(&mutex);
  if (caProgramList.Count()) {
     for (cCiCaProgramData *p = caProgramList.First(); p; p = caProgramList.Next(p)) {
         if (p->modified)
            return true; // any modifications need to be processed before we can assume it's no longer decrypting
         for (cCiCaPidData *q = p->pidList.First(); q; q = p->pidList.Next(q)) {
             if (q->active)
                return true;
             }
         }
     }
  return false;
}

uchar *cCamSlot::Decrypt(uchar *Data, int &Count)
{
  Count = TS_SIZE;
  return Data;
}

// --- cCamSlots -------------------------------------------------------------

cCamSlots CamSlots;

bool cCamSlots::WaitForAllCamSlotsReady(int Timeout)
{
  for (time_t t0 = time(NULL); time(NULL) - t0 < Timeout; ) {
      bool ready = true;
      for (cCamSlot *CamSlot = CamSlots.First(); CamSlot; CamSlot = CamSlots.Next(CamSlot)) {
          if (!CamSlot->Ready()) {
             ready = false;
             cCondWait::SleepMs(100);
             }
          }
      if (ready)
         return true;
      }
  return false;
}

// --- cChannelCamRelation ---------------------------------------------------

#define CAM_CHECKED_TIMEOUT  15 // seconds before a CAM that has been checked for a particular channel will be checked again

class cChannelCamRelation : public cListObject {
private:
  tChannelID channelID;
  uint32_t camSlotsChecked;
  uint32_t camSlotsDecrypt;
  time_t lastChecked;
public:
  cChannelCamRelation(tChannelID ChannelID);
  bool TimedOut(void);
  tChannelID ChannelID(void) { return channelID; }
  bool CamChecked(int CamSlotNumber);
  bool CamDecrypt(int CamSlotNumber);
  void SetChecked(int CamSlotNumber);
  void SetDecrypt(int CamSlotNumber);
  void ClrChecked(int CamSlotNumber);
  void ClrDecrypt(int CamSlotNumber);
  };

cChannelCamRelation::cChannelCamRelation(tChannelID ChannelID)
{
  channelID = ChannelID;
  camSlotsChecked = 0;
  camSlotsDecrypt = 0;
  lastChecked = 0;
}

bool cChannelCamRelation::TimedOut(void)
{
  return !camSlotsDecrypt && time(NULL) - lastChecked > CAM_CHECKED_TIMEOUT;
}

bool cChannelCamRelation::CamChecked(int CamSlotNumber)
{
  if (lastChecked && time(NULL) - lastChecked > CAM_CHECKED_TIMEOUT) {
     lastChecked = 0;
     camSlotsChecked = 0;
     }
  return camSlotsChecked & (1 << (CamSlotNumber - 1));
}

bool cChannelCamRelation::CamDecrypt(int CamSlotNumber)
{
  return camSlotsDecrypt & (1 << (CamSlotNumber - 1));
}

void cChannelCamRelation::SetChecked(int CamSlotNumber)
{
  camSlotsChecked |= (1 << (CamSlotNumber - 1));
  lastChecked = time(NULL);
  ClrDecrypt(CamSlotNumber);
}

void cChannelCamRelation::SetDecrypt(int CamSlotNumber)
{
  camSlotsDecrypt |= (1 << (CamSlotNumber - 1));
  ClrChecked(CamSlotNumber);
}

void cChannelCamRelation::ClrChecked(int CamSlotNumber)
{
  camSlotsChecked &= ~(1 << (CamSlotNumber - 1));
  lastChecked = 0;
}

void cChannelCamRelation::ClrDecrypt(int CamSlotNumber)
{
  camSlotsDecrypt &= ~(1 << (CamSlotNumber - 1));
}

// --- cChannelCamRelations --------------------------------------------------

#define CHANNEL_CAM_RELATIONS_CLEANUP_INTERVAL 3600 // seconds between cleanups

cChannelCamRelations ChannelCamRelations;

cChannelCamRelations::cChannelCamRelations(void)
{
  lastCleanup = time(NULL);
}

void cChannelCamRelations::Cleanup(void)
{
  cMutexLock MutexLock(&mutex);
  if (time(NULL) - lastCleanup > CHANNEL_CAM_RELATIONS_CLEANUP_INTERVAL) {
     for (cChannelCamRelation *ccr = First(); ccr; ) {
         cChannelCamRelation *c = ccr;
         ccr = Next(ccr);
         if (c->TimedOut())
            Del(c);
         }
     lastCleanup = time(NULL);
     }
}

cChannelCamRelation *cChannelCamRelations::GetEntry(tChannelID ChannelID)
{
  cMutexLock MutexLock(&mutex);
  Cleanup();
  for (cChannelCamRelation *ccr = First(); ccr; ccr = Next(ccr)) {
      if (ccr->ChannelID() == ChannelID)
         return ccr;
      }
  return NULL;
}

cChannelCamRelation *cChannelCamRelations::AddEntry(tChannelID ChannelID)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = GetEntry(ChannelID);
  if (!ccr)
     Add(ccr = new cChannelCamRelation(ChannelID));
  return ccr;
}

void cChannelCamRelations::Reset(int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  for (cChannelCamRelation *ccr = First(); ccr; ccr = Next(ccr)) {
      ccr->ClrChecked(CamSlotNumber);
      ccr->ClrDecrypt(CamSlotNumber);
      }
}

bool cChannelCamRelations::CamChecked(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = GetEntry(ChannelID);
  return ccr ? ccr->CamChecked(CamSlotNumber) : false;
}

bool cChannelCamRelations::CamDecrypt(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = GetEntry(ChannelID);
  return ccr ? ccr->CamDecrypt(CamSlotNumber) : false;
}

void cChannelCamRelations::SetChecked(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = AddEntry(ChannelID);
  if (ccr)
     ccr->SetChecked(CamSlotNumber);
}

void cChannelCamRelations::SetDecrypt(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = AddEntry(ChannelID);
  if (ccr)
     ccr->SetDecrypt(CamSlotNumber);
}

void cChannelCamRelations::ClrChecked(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = GetEntry(ChannelID);
  if (ccr)
     ccr->ClrChecked(CamSlotNumber);
}

void cChannelCamRelations::ClrDecrypt(tChannelID ChannelID, int CamSlotNumber)
{
  cMutexLock MutexLock(&mutex);
  cChannelCamRelation *ccr = GetEntry(ChannelID);
  if (ccr)
     ccr->ClrDecrypt(CamSlotNumber);
}