summaryrefslogtreecommitdiffstats
path: root/ipalib/plugins/dns.py
blob: bd637dcd8883d6d91ed69f5bdb31443591a87ee1 (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
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
# Authors:
#   Martin Kosek <mkosek@redhat.com>
#   Pavel Zuna <pzuna@redhat.com>
#
# Copyright (C) 2010  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import

import netaddr
import time
import re
import dns.name

from ipalib.request import context
from ipalib import api, errors, output
from ipalib import Command
from ipalib.parameters import Flag, Bool, Int, Decimal, Str, StrEnum, Any
from ipalib.plugins.baseldap import *
from ipalib import _, ngettext
from ipalib.util import (validate_zonemgr, normalize_zonemgr,
        validate_hostname, validate_dns_label, validate_domain_name,
        get_dns_forward_zone_update_policy, get_dns_reverse_zone_update_policy)
from ipapython.ipautil import valid_ip, CheckedIPAddress, is_host_resolvable

__doc__ = _("""
Domain Name System (DNS)

Manage DNS zone and resource records.


USING STRUCTURED PER-TYPE OPTIONS

There are many structured DNS RR types where DNS data stored in LDAP server
is not just a scalar value, for example an IP address or a domain name, but
a data structure which may be often complex. A good example is a LOC record
[RFC1876] which consists of many mandatory and optional parts (degrees,
minutes, seconds of latitude and longitude, altitude or precision).

It may be difficult to manipulate such DNS records without making a mistake
and entering an invalid value. DNS module provides an abstraction over these
raw records and allows to manipulate each RR type with specific options. For
each supported RR type, DNS module provides a standard option to manipulate
a raw records with format --<rrtype>-rec, e.g. --mx-rec, and special options
for every part of the RR structure with format --<rrtype>-<partname>, e.g.
--mx-preference and --mx-exchanger.

When adding a record, either RR specific options or standard option for a raw
value can be used, they just should not be combined in one add operation. When
modifying an existing entry, new RR specific options can be used to change
one part of a DNS record, where the standard option for raw value is used
to specify the modified value. The following example demonstrates
a modification of MX record preference form 0 to 1 in a record without
modifying the exchanger:
ipa dnsrecord-mod --mx-rec="0 mx.example.com." --mx-preference=1


EXAMPLES:

 Add new zone:
   ipa dnszone-add example.com --name-server=nameserver.example.com \\
                               --admin-email=admin@example.com

 Add system permission that can be used for per-zone privilege delegation:
   ipa dnszone-add-permission example.com

 Modify the zone to allow dynamic updates for hosts own records in realm EXAMPLE.COM:
   ipa dnszone-mod example.com --dynamic-update=TRUE

   This is the equivalent of:
     ipa dnszone-mod example.com --dynamic-update=TRUE \\
      --update-policy="grant EXAMPLE.COM krb5-self * A; grant EXAMPLE.COM krb5-self * AAAA; grant EXAMPLE.COM krb5-self * SSHFP;"

 Modify the zone to allow zone transfers for local network only:
   ipa dnszone-mod example.com --allow-transfer=10.0.0.0/8

 Add new reverse zone specified by network IP address:
   ipa dnszone-add --name-from-ip=80.142.15.0/24 \\
                   --name-server=nameserver.example.com

 Add second nameserver for example.com:
   ipa dnsrecord-add example.com @ --ns-rec=nameserver2.example.com

 Add a mail server for example.com:
   ipa dnsrecord-add example.com @ --mx-rec="10 mail1"

 Add another record using MX record specific options:
  ipa dnsrecord-add example.com @ --mx-preference=20 --mx-exchanger=mail2

 Add another record using interactive mode (started when dnsrecord-add, dnsrecord-mod,
 or dnsrecord-del are executed with no options):
  ipa dnsrecord-add example.com @
  Please choose a type of DNS resource record to be added
  The most common types for this type of zone are: NS, MX, LOC

  DNS resource record type: MX
  MX Preference: 30
  MX Exchanger: mail3
    Record name: example.com
    MX record: 10 mail1, 20 mail2, 30 mail3
    NS record: nameserver.example.com., nameserver2.example.com.

 Delete previously added nameserver from example.com:
   ipa dnsrecord-del example.com @ --ns-rec=nameserver2.example.com.

 Add LOC record for example.com:
   ipa dnsrecord-add example.com @ --loc-rec="49 11 42.4 N 16 36 29.6 E 227.64m"

 Add new A record for www.example.com. Create a reverse record in appropriate
 reverse zone as well. In this case a PTR record "2" pointing to www.example.com.
 will be created in zone 15.142.80.in-addr.arpa.
   ipa dnsrecord-add example.com www --a-rec=80.142.15.2 --a-create-reverse

 Add new PTR record for www.example.com
   ipa dnsrecord-add 15.142.80.in-addr.arpa. 2 --ptr-rec=www.example.com.

 Add new SRV records for LDAP servers. Three quarters of the requests
 should go to fast.example.com, one quarter to slow.example.com. If neither
 is available, switch to backup.example.com.
   ipa dnsrecord-add example.com _ldap._tcp --srv-rec="0 3 389 fast.example.com"
   ipa dnsrecord-add example.com _ldap._tcp --srv-rec="0 1 389 slow.example.com"
   ipa dnsrecord-add example.com _ldap._tcp --srv-rec="1 1 389 backup.example.com"

 The interactive mode can be used for easy modification:
  ipa dnsrecord-mod example.com _ldap._tcp
  No option to modify specific record provided.
  Current DNS record contents:

  SRV record: 0 3 389 fast.example.com, 0 1 389 slow.example.com, 1 1 389 backup.example.com

  Modify SRV record '0 3 389 fast.example.com'? Yes/No (default No):
  Modify SRV record '0 1 389 slow.example.com'? Yes/No (default No): y
  SRV Priority [0]:                     (keep the default value)
  SRV Weight [1]: 2                     (modified value)
  SRV Port [389]:                       (keep the default value)
  SRV Target [slow.example.com]:        (keep the default value)
  1 SRV record skipped. Only one value per DNS record type can be modified at one time.
    Record name: _ldap._tcp
    SRV record: 0 3 389 fast.example.com, 1 1 389 backup.example.com, 0 2 389 slow.example.com

 After this modification, three fifths of the requests should go to
 fast.example.com and two fifths to slow.example.com.

 An example of the interactive mode for dnsrecord-del command:
   ipa dnsrecord-del example.com www
   No option to delete specific record provided.
   Delete all? Yes/No (default No):     (do not delete all records)
   Current DNS record contents:

   A record: 1.2.3.4, 11.22.33.44

   Delete A record '1.2.3.4'? Yes/No (default No):
   Delete A record '11.22.33.44'? Yes/No (default No): y
     Record name: www
     A record: 1.2.3.4                  (A record 11.22.33.44 has been deleted)

 Show zone example.com:
   ipa dnszone-show example.com

 Find zone with "example" in its domain name:
   ipa dnszone-find example

 Find records for resources with "www" in their name in zone example.com:
   ipa dnsrecord-find example.com www

 Find A records with value 10.10.0.1 in zone example.com
   ipa dnsrecord-find example.com --a-rec=10.10.0.1

 Show records for resource www in zone example.com
   ipa dnsrecord-show example.com www

 Forward all request for a zone external.com to another nameserver using
 a "first" policy (it will send the queries to the selected forwarder and if
 not answered it will use global resolvers):
   ipa dnszone-add external.com
   ipa dnszone-mod external.com --forwarder=10.20.0.1 \\
                                --forward-policy=first

 Delete zone example.com with all resource records:
   ipa dnszone-del example.com

 Resolve a host name to see if it exists (will add default IPA domain
 if one is not included):
   ipa dns-resolve www.example.com
   ipa dns-resolve www


GLOBAL DNS CONFIGURATION

DNS configuration passed to command line install script is stored in a local
configuration file on each IPA server where DNS service is configured. These
local settings can be overridden with a common configuration stored in LDAP
server:

 Show global DNS configuration:
   ipa dnsconfig-show

 Modify global DNS configuration and set a list of global forwarders:
   ipa dnsconfig-mod --forwarder=10.0.0.1
""")

# supported resource record types
_record_types = (
    u'A', u'AAAA', u'A6', u'AFSDB', u'APL', u'CERT', u'CNAME', u'DHCID', u'DLV',
    u'DNAME', u'DNSKEY', u'DS', u'HIP', u'IPSECKEY', u'KEY', u'KX', u'LOC',
    u'MX', u'NAPTR', u'NS', u'NSEC', u'NSEC3', u'NSEC3PARAM', u'PTR',
    u'RRSIG', u'RP', u'SIG', u'SPF', u'SRV', u'SSHFP', u'TA', u'TKEY',
    u'TSIG', u'TXT',
)

# DNS zone record identificator
_dns_zone_record = u'@'

# most used record types, always ask for those in interactive prompt
_top_record_types = ('A', 'AAAA', )
_rev_top_record_types = ('PTR', )
_zone_top_record_types = ('NS', 'MX', 'LOC', )

# attributes derived from record types
_record_attributes = [str('%srecord' % t.lower()) for t in _record_types]

# supported DNS classes, IN = internet, rest is almost never used
_record_classes = (u'IN', u'CS', u'CH', u'HS')

def _rname_validator(ugettext, zonemgr):
    try:
        validate_zonemgr(zonemgr)
    except ValueError, e:
        return unicode(e)
    return None

def _create_zone_serial():
    """
    Generate serial number for zones. bind-dyndb-ldap expects unix time in
    to be used for SOA serial.

    SOA serial in a date format would also work, but it may be set to far
    future when many DNS updates are done per day (more than 100). Unix
    timestamp is more resilient to this issue.
    """
    return int(time.time())

def _reverse_zone_name(netstr):
    net = netaddr.IPNetwork(netstr)
    items = net.ip.reverse_dns.split('.')
    if net.version == 4:
        return u'.'.join(items[4 - net.prefixlen / 8:])
    elif net.version == 6:
        return u'.'.join(items[32 - net.prefixlen / 4:])
    else:
        return None

def _validate_ipaddr(ugettext, ipaddr, ip_version=None):
    try:
        ip = netaddr.IPAddress(ipaddr, flags=netaddr.INET_PTON)

        if ip_version is not None:
            if ip.version != ip_version:
                return _('invalid IP address version (is %(value)d, must be %(required_value)d)!') \
                        % dict(value=ip.version, required_value=ip_version)
    except (netaddr.AddrFormatError, ValueError):
        return _('invalid IP address format')
    return None

def _validate_ip4addr(ugettext, ipaddr):
    return _validate_ipaddr(ugettext, ipaddr, 4)

def _validate_ip6addr(ugettext, ipaddr):
    return _validate_ipaddr(ugettext, ipaddr, 6)

def _validate_ipnet(ugettext, ipnet):
    try:
        net = netaddr.IPNetwork(ipnet)
    except (netaddr.AddrFormatError, ValueError, UnboundLocalError):
        return _('invalid IP network format')
    return None

def _validate_bind_aci(ugettext, bind_acis):
    if not bind_acis:
        return

    bind_acis = bind_acis.split(';')
    if bind_acis[-1]:
        return _('each ACL element must be terminated with a semicolon')
    else:
        bind_acis.pop(-1)

    for bind_aci in bind_acis:
        if bind_aci in ("any", "none"):
            continue

        if bind_aci in ("localhost", "localnets"):
            return _('ACL name "%s" is not supported') % bind_aci

        if bind_aci.startswith('!'):
            bind_aci = bind_aci[1:]

        try:
            ip = CheckedIPAddress(bind_aci, parse_netmask=True,
                                  allow_network=True)
        except (netaddr.AddrFormatError, ValueError), e:
            return unicode(e)
        except UnboundLocalError:
            return _(u"invalid address format")

def _normalize_bind_aci(bind_acis):
    if not bind_acis:
        return
    bind_acis = bind_acis.split(';')
    normalized = []
    for bind_aci in bind_acis:
        if not bind_aci:
            continue
        if bind_aci in ("any", "none", "localhost", "localnets"):
            normalized.append(bind_aci)
            continue

        prefix = ""
        if bind_aci.startswith('!'):
            bind_aci = bind_aci[1:]
            prefix = "!"

        try:
            ip = CheckedIPAddress(bind_aci, parse_netmask=True,
                                  allow_network=True)
            if '/' in bind_aci:    # addr with netmask
                netmask = "/%s" % ip.prefixlen
            else:
                netmask = ""
            normalized.append(u"%s%s%s" % (prefix, str(ip), netmask))
            continue
        except:
            normalized.append(bind_aci)
            continue

    acis = u';'.join(normalized)
    acis += u';'
    return acis

def _bind_hostname_validator(ugettext, value):
    try:
        # Allow domain name which is not fully qualified. These are supported
        # in bind and then translated as <non-fqdn-name>.<domain>.
        validate_hostname(value, check_fqdn=False)
    except ValueError, e:
        return _('invalid domain-name: %s') \
            % unicode(e)

    return None

def _dns_record_name_validator(ugettext, value):
    if value == _dns_zone_record:
        return

    try:
        map(lambda label:validate_dns_label(label, allow_underscore=True), \
            value.split(u'.'))
    except ValueError, e:
        return unicode(e)

def _validate_bind_forwarder(ugettext, forwarder):
    ip_address, sep, port = forwarder.partition(u' port ')

    ip_address_validation = _validate_ipaddr(ugettext, ip_address)

    if ip_address_validation is not None:
        return ip_address_validation

    if sep:
        try:
            port = int(port)
            if port < 0 or port > 65535:
                raise ValueError()
        except ValueError:
            return _('%(port)s is not a valid port' % dict(port=port))

    return None

def _domain_name_validator(ugettext, value):
    try:
        validate_domain_name(value)
    except ValueError, e:
        return unicode(e)

def _hostname_validator(ugettext, value):
    try:
        validate_hostname(value)
    except ValueError, e:
        return _('invalid domain-name: %s') \
            % unicode(e)

    return None

def _normalize_hostname(domain_name):
    """Make it fully-qualified"""
    if domain_name[-1] != '.':
        return domain_name + '.'
    else:
        return domain_name

def is_forward_record(zone, str_address):
    addr = netaddr.IPAddress(str_address)
    if addr.version == 4:
        result = api.Command['dnsrecord_find'](zone, arecord=str_address)
    elif addr.version == 6:
        result = api.Command['dnsrecord_find'](zone, aaaarecord=str_address)
    else:
        raise ValueError('Invalid address family')

    return result['count'] > 0

def add_forward_record(zone, name, str_address):
    addr = netaddr.IPAddress(str_address)
    try:
        if addr.version == 4:
            api.Command['dnsrecord_add'](zone, name, arecord=str_address)
        elif addr.version == 6:
            api.Command['dnsrecord_add'](zone, name, aaaarecord=str_address)
        else:
            raise ValueError('Invalid address family')
    except errors.EmptyModlist:
        pass # the entry already exists and matches

def get_reverse_zone(ipaddr, prefixlen=None):
    ip = netaddr.IPAddress(ipaddr)
    revdns = unicode(ip.reverse_dns)

    if prefixlen is None:
        revzone = u''

        result = api.Command['dnszone_find']()['result']
        for zone in result:
            zonename = zone['idnsname'][0]
            if revdns.endswith(zonename) and len(zonename) > len(revzone):
                revzone = zonename
    else:
        if ip.version == 4:
            pos = 4 - prefixlen / 8
        elif ip.version == 6:
            pos = 32 - prefixlen / 4
        items = ip.reverse_dns.split('.')
        revzone = u'.'.join(items[pos:])

        try:
            api.Command['dnszone_show'](revzone)
        except errors.NotFound:
            revzone = u''

    if len(revzone) == 0:
        raise errors.NotFound(
            reason=_('DNS reverse zone for IP address %(addr)s not found') % dict(addr=ipaddr)
        )

    revname = revdns[:-len(revzone)-1]

    return revzone, revname

def add_records_for_host_validation(option_name, host, domain, ip_addresses, check_forward=True, check_reverse=True):
    try:
        api.Command['dnszone_show'](domain)['result']
    except errors.NotFound:
        raise errors.NotFound(
            reason=_('DNS zone %(zone)s not found') % dict(zone=domain)
        )
    if not isinstance(ip_addresses, (tuple, list)):
        ip_addresses = [ip_addresses]

    for ip_address in ip_addresses:
        try:
            ip = CheckedIPAddress(ip_address, match_local=False)
        except Exception, e:
            raise errors.ValidationError(name=option_name, error=unicode(e))

        if check_forward:
            if is_forward_record(domain, unicode(ip)):
                raise errors.DuplicateEntry(
                        message=_(u'IP address %(ip)s is already assigned in domain %(domain)s.')\
                            % dict(ip=str(ip), domain=domain))

        if check_reverse:
            try:
                prefixlen = None
                if not ip.defaultnet:
                    prefixlen = ip.prefixlen
                # we prefer lookup of the IP through the reverse zone
                revzone, revname = get_reverse_zone(ip, prefixlen)
                reverse = api.Command['dnsrecord_find'](revzone, idnsname=revname)
                if reverse['count'] > 0:
                    raise errors.DuplicateEntry(
                            message=_(u'Reverse record for IP address %(ip)s already exists in reverse zone %(zone)s.')\
                            % dict(ip=str(ip), zone=revzone))
            except errors.NotFound:
                pass


def add_records_for_host(host, domain, ip_addresses, add_forward=True, add_reverse=True):
    if not isinstance(ip_addresses, (tuple, list)):
        ip_addresses = [ip_addresses]

    for ip_address in ip_addresses:
        ip = CheckedIPAddress(ip_address, match_local=False)

        if add_forward:
            add_forward_record(domain, host, unicode(ip))

        if add_reverse:
            try:
                prefixlen = None
                if not ip.defaultnet:
                    prefixlen = ip.prefixlen
                revzone, revname = get_reverse_zone(ip, prefixlen)
                addkw = { 'ptrrecord' : host + "." + domain }
                api.Command['dnsrecord_add'](revzone, revname, **addkw)
            except errors.EmptyModlist:
                # the entry already exists and matches
                pass

class DNSRecord(Str):
    # a list of parts that create the actual raw DNS record
    parts = None
    # an optional list of parameters used in record-specific operations
    extra = None
    supported = True
    # supported RR types: https://fedorahosted.org/bind-dyndb-ldap/browser/doc/schema

    label_format = _("%s record")
    part_label_format = "%s %s"
    doc_format = _('Comma-separated list of raw %s records')
    option_group_format = _('%s Record')
    see_rfc_msg = _("(see RFC %s for details)")
    part_name_format = "%s_part_%s"
    extra_name_format = "%s_extra_%s"
    cli_name_format = "%s_%s"
    format_error_msg = None

    kwargs = Str.kwargs + (
        ('validatedns', bool, True),
        ('normalizedns', bool, True),
    )

    # should be replaced in subclasses
    rrtype = None
    rfc = None

    def __init__(self, name=None, *rules, **kw):
        if self.rrtype not in _record_types:
            raise ValueError("Unknown RR type: %s. Must be one of %s" % \
                    (str(self.rrtype), ", ".join(_record_types)))
        if not name:
            name = "%srecord*" % self.rrtype.lower()
        kw.setdefault('cli_name', '%s_rec' % self.rrtype.lower())
        kw.setdefault('label', self.label_format % self.rrtype)
        kw.setdefault('doc', self.doc_format % self.rrtype)
        kw.setdefault('option_group', self.option_group_format % self.rrtype)
        kw['csv'] = True

        if not self.supported:
            kw['flags'] = ('no_option',)

        super(DNSRecord, self).__init__(name, *rules, **kw)

    def _get_part_values(self, value):
        values = value.split()
        if len(values) != len(self.parts):
            return None
        return tuple(values)

    def _part_values_to_string(self, values, index):
        self._validate_parts(values)
        return u" ".join(super(DNSRecord, self)._convert_scalar(v, index) \
                             for v in values if v is not None)

    def get_parts_from_kw(self, kw, raise_on_none=True):
        part_names = tuple(self.part_name_format % (self.rrtype.lower(), part.name) \
                               for part in self.parts)
        vals = tuple(kw.get(part_name) for part_name in part_names)

        if all(val is None for val in vals):
             return

        if raise_on_none:
            for val_id,val in enumerate(vals):
                 if val is None and self.parts[val_id].required:
                    cli_name = self.cli_name_format % (self.rrtype.lower(), self.parts[val_id].name)
                    raise errors.ConversionError(name=self.name,
                                error=_("'%s' is a required part of DNS record") % cli_name)

        return vals

    def _validate_parts(self, parts):
        if len(parts) != len(self.parts):
            raise errors.ValidationError(name=self.name,
                                         error=_("Invalid number of parts!"))

    def _convert_scalar(self, value, index=None):
        if isinstance(value, (tuple, list)):
            return self._part_values_to_string(value, index)
        return super(DNSRecord, self)._convert_scalar(value, index)

    def normalize(self, value):
        if self.normalizedns: #pylint: disable=E1101
            if isinstance(value, (tuple, list)):
                value = tuple(
                            self._normalize_parts(v) for v in value \
                                    if v is not None
                        )
            elif value is not None:
                value = (self._normalize_parts(value),)

        return super(DNSRecord, self).normalize(value)

    def _normalize_parts(self, value):
        """
        Normalize a DNS record value using normalizers for its parts.
        """
        if self.parts is None:
            return value
        try:
            values = self._get_part_values(value)
            if not values:
                return value

            converted_values = [ part._convert_scalar(values[part_id]) \
                                 if values[part_id] is not None else None
                                 for part_id, part in enumerate(self.parts)
                               ]

            new_values = [ part.normalize(converted_values[part_id]) \
                            for part_id, part in enumerate(self.parts) ]

            value = self._convert_scalar(new_values)
        except Exception:
            # cannot normalize, rather return original value than fail
            pass
        return value

    def _rule_validatedns(self, _, value):
        if not self.validatedns: #pylint: disable=E1101
            return

        if value is None:
            return

        if value is None:
            return

        if not self.supported:
            return _('DNS RR type "%s" is not supported by bind-dyndb-ldap plugin') \
                     % self.rrtype

        if self.parts is None:
            return

        # validate record format
        values = self._get_part_values(value)
        if not values:
            if not self.format_error_msg:
                part_names = [part.name.upper() for part in self.parts]

                if self.rfc:
                    see_rfc_msg = " " + self.see_rfc_msg % self.rfc
                else:
                    see_rfc_msg = ""
                return _('format must be specified as "%(format)s" %(rfcs)s') \
                    % dict(format=" ".join(part_names), rfcs=see_rfc_msg)
            else:
                return self.format_error_msg

        # validate every part
        for part_id, part in enumerate(self.parts):
            val = part.normalize(values[part_id])
            val = part.convert(val)
            part.validate(val)
        return None

    def _convert_dnsrecord_part(self, part):
        """
        All parts of DNSRecord need to be processed and modified before they
        can be added to global DNS API. For example a prefix need to be added
        before part name so that the name is unique in the global namespace.
        """
        name = self.part_name_format % (self.rrtype.lower(), part.name)
        cli_name = self.cli_name_format % (self.rrtype.lower(), part.name)
        label = self.part_label_format % (self.rrtype, unicode(part.label))
        option_group = self.option_group_format % self.rrtype
        flags = list(part.flags) + ['dnsrecord_part', 'virtual_attribute',]

        if not part.required:
            flags.append('dnsrecord_optional')

        return part.clone_rename(name,
                     cli_name=cli_name,
                     label=label,
                     required=False,
                     option_group=option_group,
                     flags=flags,
                     hint=self.name,)   # name of parent RR param

    def _convert_dnsrecord_extra(self, extra):
        """
        Parameters for special per-type behavior need to be processed in the
        same way as record parts in _convert_dnsrecord_part().
        """
        name = self.extra_name_format % (self.rrtype.lower(), extra.name)
        cli_name = self.cli_name_format % (self.rrtype.lower(), extra.name)
        label = self.part_label_format % (self.rrtype, unicode(extra.label))
        option_group = self.option_group_format % self.rrtype
        flags = list(extra.flags) + ['dnsrecord_extra', 'virtual_attribute',]

        return extra.clone_rename(name,
                     cli_name=cli_name,
                     label=label,
                     required=False,
                     option_group=option_group,
                     flags=flags,
                     hint=self.name,)   # name of parent RR param

    def get_parts(self):
        if self.parts is None:
            return tuple()

        return tuple(self._convert_dnsrecord_part(part) for part in self.parts)

    def get_extra(self):
        if self.extra is None:
            return tuple()

        return tuple(self._convert_dnsrecord_extra(extra) for extra in self.extra)

    def __get_part_param(self, backend, part, output_kw, default=None):
        name = self.part_name_format % (self.rrtype.lower(), part.name)
        label = self.part_label_format % (self.rrtype, unicode(part.label))
        optional = not part.required

        while True:
            try:
                raw = backend.textui.prompt(label,
                                            optional=optional,
                                            default=default)
                if not raw.strip():
                    raw = default

                output_kw[name] = part(raw)
                break
            except (errors.ValidationError, errors.ConversionError), e:
                backend.textui.print_prompt_attribute_error(
                        unicode(label), unicode(e.error))

    def prompt_parts(self, backend, mod_dnsvalue=None):
        mod_parts = None
        if mod_dnsvalue is not None:
            mod_parts = self._get_part_values(mod_dnsvalue)

        user_options = {}
        if self.parts is None:
            return user_options

        for part_id, part in enumerate(self.parts):
            if mod_parts:
                default = mod_parts[part_id]
            else:
                default = None

            self.__get_part_param(backend, part, user_options, default)

        return user_options

    def prompt_missing_parts(self, backend, kw, prompt_optional=False):
        user_options = {}
        if self.parts is None:
            return user_options

        for part in self.parts:
            name = self.part_name_format % (self.rrtype.lower(), part.name)
            label = self.part_label_format % (self.rrtype, unicode(part.label))

            if name in kw:
                continue

            optional = not part.required
            if optional and not prompt_optional:
                continue

            default = part.get_default(**kw)
            self.__get_part_param(backend, part, user_options, default)

        return user_options

    # callbacks for per-type special record behavior
    def dnsrecord_add_pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        assert isinstance(dn, DN)

    def dnsrecord_add_post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)

class ForwardRecord(DNSRecord):
    extra = (
        Flag('create_reverse?',
            label=_('Create reverse'),
            doc=_('Create reverse record for this IP Address'),
            flags=['no_update']
        ),
    )

    def dnsrecord_add_pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        assert isinstance(dn, DN)
        reverse_option = self._convert_dnsrecord_extra(self.extra[0])
        if options.get(reverse_option.name):
            records = entry_attrs.get(self.name, [])
            if not records:
                # --<rrtype>-create-reverse is set, but there are not records
                raise errors.RequirementError(name=self.name)

            for record in records:
                add_records_for_host_validation(self.name, keys[-1], keys[-2], record,
                        check_forward=False,
                        check_reverse=True)

            setattr(context, '%s_reverse' % self.name, entry_attrs.get(self.name))

    def dnsrecord_add_post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        rev_records = getattr(context, '%s_reverse' % self.name, [])

        if rev_records:
            # make sure we don't run this post callback action again in nested
            # commands, line adding PTR record in add_records_for_host
            delattr(context, '%s_reverse' % self.name)
            for record in rev_records:
                try:
                    add_records_for_host(keys[-1], keys[-2], record,
                        add_forward=False, add_reverse=True)
                except Exception, e:
                    raise errors.NonFatalError(
                        reason=_('Cannot create reverse record for "%(value)s": %(exc)s') \
                                % dict(value=record, exc=unicode(e)))

class ARecord(ForwardRecord):
    rrtype = 'A'
    rfc = 1035
    parts = (
        Str('ip_address',
            _validate_ip4addr,
            label=_('IP Address'),
        ),
    )

class A6Record(DNSRecord):
    rrtype = 'A6'
    rfc = 3226
    parts = (
        Str('data',
            label=_('Record data'),
        ),
    )

    def _get_part_values(self, value):
        # A6 RR type is obsolete and only a raw interface is provided
        return (value,)

class AAAARecord(ForwardRecord):
    rrtype = 'AAAA'
    rfc = 3596
    parts = (
        Str('ip_address',
            _validate_ip6addr,
            label=_('IP Address'),
        ),
    )

class AFSDBRecord(DNSRecord):
    rrtype = 'AFSDB'
    rfc = 1183
    parts = (
        Int('subtype?',
            label=_('Subtype'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('hostname',
            _bind_hostname_validator,
            label=_('Hostname'),
        ),
    )

class APLRecord(DNSRecord):
    rrtype = 'APL'
    rfc = 3123
    supported = False

class CERTRecord(DNSRecord):
    rrtype = 'CERT'
    rfc = 4398
    parts = (
        Int('type',
            label=_('Certificate Type'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('key_tag',
            label=_('Key Tag'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('algorithm',
            label=_('Algorithm'),
            minvalue=0,
            maxvalue=255,
        ),
        Str('certificate_or_crl',
            label=_('Certificate/CRL'),
        ),
    )

class CNAMERecord(DNSRecord):
    rrtype = 'CNAME'
    rfc = 1035
    parts = (
        Str('hostname',
            _bind_hostname_validator,
            label=_('Hostname'),
            doc=_('A hostname which this alias hostname points to'),
        ),
    )

class DHCIDRecord(DNSRecord):
    rrtype = 'DHCID'
    rfc = 4701
    supported = False

class DLVRecord(DNSRecord):
    rrtype = 'DLV'
    rfc = 4431
    supported = False

class DNAMERecord(DNSRecord):
    rrtype = 'DNAME'
    rfc = 2672
    parts = (
        Str('target',
            _bind_hostname_validator,
            label=_('Target'),
        ),
    )

class DNSKEYRecord(DNSRecord):
    rrtype = 'DNSKEY'
    rfc = 4034
    supported = False

class DSRecord(DNSRecord):
    rrtype = 'DS'
    rfc = 4034
    parts = (
        Int('key_tag',
            label=_('Key Tag'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('algorithm',
            label=_('Algorithm'),
            minvalue=0,
            maxvalue=255,
        ),
        Int('digest_type',
            label=_('Digest Type'),
            minvalue=0,
            maxvalue=255,
        ),
        Str('digest',
            label=_('Digest'),
        ),
    )

class HIPRecord(DNSRecord):
    rrtype = 'HIP'
    rfc = 5205
    supported = False

class KEYRecord(DNSRecord):
    rrtype = 'KEY'
    rfc = 2535
    parts = (
        Int('flags',
            label=_('Flags'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('protocol',
            label=_('Protocol'),
            minvalue=0,
            maxvalue=255,
        ),
        Int('algorithm',
            label=_('Algorithm'),
            minvalue=0,
            maxvalue=255,
        ),
        Str('public_key',
            label=_('Public Key'),
        ),
    )

class IPSECKEYRecord(DNSRecord):
    rrtype = 'IPSECKEY'
    rfc = 4025
    supported = False

class KXRecord(DNSRecord):
    rrtype = 'KX'
    rfc = 2230
    parts = (
        Int('preference',
            label=_('Preference'),
            doc=_('Preference given to this exchanger. Lower values are more preferred'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('exchanger',
            _bind_hostname_validator,
            label=_('Exchanger'),
            doc=_('A host willing to act as a key exchanger'),
        ),
    )

class LOCRecord(DNSRecord):
    rrtype = 'LOC'
    rfc = 1876
    parts = (
        Int('lat_deg',
            label=_('Degrees Latitude'),
            minvalue=0,
            maxvalue=90,
        ),
        Int('lat_min?',
            label=_('Minutes Latitude'),
            minvalue=0,
            maxvalue=59,
        ),
        Decimal('lat_sec?',
            label=_('Seconds Latitude'),
            minvalue='0.0',
            maxvalue='59.999',
            precision=3,
        ),
        StrEnum('lat_dir',
            label=_('Direction Latitude'),
            values=(u'N', u'S',),
        ),
        Int('lon_deg',
            label=_('Degrees Longitude'),
            minvalue=0,
            maxvalue=180,
        ),
        Int('lon_min?',
            label=_('Minutes Longitude'),
            minvalue=0,
            maxvalue=59,
        ),
        Decimal('lon_sec?',
            label=_('Seconds Longitude'),
            minvalue='0.0',
            maxvalue='59.999',
            precision=3,
        ),
        StrEnum('lon_dir',
            label=_('Direction Longitude'),
            values=(u'E', u'W',),
        ),
        Decimal('altitude',
            label=_('Altitude'),
            minvalue='-100000.00',
            maxvalue='42849672.95',
            precision=2,
        ),
        Decimal('size?',
            label=_('Size'),
            minvalue='0.0',
            maxvalue='90000000.00',
            precision=2,
        ),
        Decimal('h_precision?',
            label=_('Horizontal Precision'),
            minvalue='0.0',
            maxvalue='90000000.00',
            precision=2,
        ),
        Decimal('v_precision?',
            label=_('Vertical Precision'),
            minvalue='0.0',
            maxvalue='90000000.00',
            precision=2,
        ),
    )

    format_error_msg = _("""format must be specified as
    "d1 [m1 [s1]] {"N"|"S"}  d2 [m2 [s2]] {"E"|"W"} alt["m"] [siz["m"] [hp["m"] [vp["m"]]]]"
    where:
       d1:     [0 .. 90]            (degrees latitude)
       d2:     [0 .. 180]           (degrees longitude)
       m1, m2: [0 .. 59]            (minutes latitude/longitude)
       s1, s2: [0 .. 59.999]        (seconds latitude/longitude)
       alt:    [-100000.00 .. 42849672.95] BY .01 (altitude in meters)
       siz, hp, vp: [0 .. 90000000.00] (size/precision in meters)
    See RFC 1876 for details""")

    def _get_part_values(self, value):
        regex = re.compile(\
            r'(?P<d1>\d{1,2}\s+)(?P<m1>\d{1,2}\s+)?(?P<s1>\d{1,2}\.?\d{1,3}?\s+)?'\
            r'(?P<dir1>[N|S])\s+'\
            r'(?P<d2>\d{1,3}\s+)(?P<m2>\d{1,2}\s+)?(?P<s2>\d{1,2}\.?\d{1,3}?\s+)?'\
            r'(?P<dir2>[W|E])\s+'\
            r'(?P<alt>-?\d{1,8}\.?\d{1,2}?)m?\s*'\
            r'(?P<siz>\d{1,8}\.?\d{1,2}?)?m?\s*'\
            r'(?P<hp>\d{1,8}\.?\d{1,2}?)?m?\s*(?P<vp>\d{1,8}\.?\d{1,2}?)?m?\s*$')

        m = regex.match(value)

        if m is None:
            return None

        return tuple(x.strip() if x is not None else x for x in m.groups())

    def _validate_parts(self, parts):
        super(LOCRecord, self)._validate_parts(parts)

        # create part_name -> part_id map first
        part_name_map = dict((part.name, part_id) \
                             for part_id,part in enumerate(self.parts))

        requirements = ( ('lat_sec', 'lat_min'),
                         ('lon_sec', 'lon_min'),
                         ('h_precision', 'size'),
                         ('v_precision', 'h_precision', 'size') )

        for req in requirements:
            target_part = req[0]

            if parts[part_name_map[target_part]] is not None:
                required_parts = req[1:]
                if any(parts[part_name_map[part]] is None for part in required_parts):
                    target_cli_name = self.cli_name_format % (self.rrtype.lower(), req[0])
                    required_cli_names = [ self.cli_name_format % (self.rrtype.lower(), part)
                                           for part in req[1:] ]
                    error = _("'%(required)s' must not be empty when '%(name)s' is set") % \
                                        dict(required=', '.join(required_cli_names),
                                             name=target_cli_name)
                    raise errors.ValidationError(name=self.name, error=error)

class MXRecord(DNSRecord):
    rrtype = 'MX'
    rfc = 1035
    parts = (
        Int('preference',
            label=_('Preference'),
            doc=_('Preference given to this exchanger. Lower values are more preferred'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('exchanger',
            _bind_hostname_validator,
            label=_('Exchanger'),
            doc=_('A host willing to act as a mail exchanger'),
        ),
    )

class NSRecord(DNSRecord):
    rrtype = 'NS'
    rfc = 1035

    parts = (
        Str('hostname',
            _bind_hostname_validator,
            label=_('Hostname'),
        ),
    )

class NSECRecord(DNSRecord):
    rrtype = 'NSEC'
    rfc = 4034
    format_error_msg = _('format must be specified as "NEXT TYPE1 '\
                         '[TYPE2 [TYPE3 [...]]]" (see RFC 4034 for details)')
    _allowed_types = (u'SOA',) + _record_types

    parts = (
        Str('next',
            _bind_hostname_validator,
            label=_('Next Domain Name'),
        ),
        StrEnum('types+',
            label=_('Type Map'),
            values=_allowed_types,
            csv=True,
        ),
    )

    def _get_part_values(self, value):
        values = value.split()

        if len(values) < 2:
            return None

        return (values[0], tuple(values[1:]))

    def _part_values_to_string(self, values, index):
        self._validate_parts(values)
        values_flat = [values[0],]  # add "next" part
        types = values[1]
        if not isinstance(types, (list, tuple)):
            types = [types,]
        values_flat.extend(types)
        return u" ".join(Str._convert_scalar(self, v, index) \
                             for v in values_flat if v is not None)

class NSEC3Record(DNSRecord):
    rrtype = 'NSEC3'
    rfc = 5155
    supported = False

class NSEC3PARAMRecord(DNSRecord):
    rrtype = 'NSEC3PARAM'
    rfc = 5155
    supported = False

def _validate_naptr_flags(ugettext, flags):
    allowed_flags = u'SAUP'
    flags = flags.replace('"','').replace('\'','')

    for flag in flags:
        if flag not in allowed_flags:
            return _('flags must be one of "S", "A", "U", or "P"')

class NAPTRRecord(DNSRecord):
    rrtype = 'NAPTR'
    rfc = 2915

    parts = (
        Int('order',
            label=_('Order'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('preference',
            label=_('Preference'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('flags',
            _validate_naptr_flags,
            label=_('Flags'),
            normalizer=lambda x:x.upper()
        ),
        Str('service',
            label=_('Service'),
        ),
        Str('regexp',
            label=_('Regular Expression'),
        ),
        Str('replacement',
            label=_('Replacement'),
        ),
    )

class PTRRecord(DNSRecord):
    rrtype = 'PTR'
    rfc = 1035
    parts = (
        Str('hostname',
            _hostname_validator,
            normalizer=_normalize_hostname,
            label=_('Hostname'),
            doc=_('The hostname this reverse record points to'),
        ),
    )

class RPRecord(DNSRecord):
    rrtype = 'RP'
    rfc = 1183
    supported = False

def _srv_target_validator(ugettext, value):
    if value == u'.':
        # service not available
        return
    return _bind_hostname_validator(ugettext, value)

class SRVRecord(DNSRecord):
    rrtype = 'SRV'
    rfc = 2782
    parts = (
        Int('priority',
            label=_('Priority'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('weight',
            label=_('Weight'),
            minvalue=0,
            maxvalue=65535,
        ),
        Int('port',
            label=_('Port'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('target',
            _srv_target_validator,
            label=_('Target'),
            doc=_('The domain name of the target host or \'.\' if the service is decidedly not available at this domain'),
        ),
    )

def _sig_time_validator(ugettext, value):
    time_format = "%Y%m%d%H%M%S"
    try:
        time.strptime(value, time_format)
    except ValueError:
        return _('the value does not follow "YYYYMMDDHHMMSS" time format')


class SIGRecord(DNSRecord):
    rrtype = 'SIG'
    rfc = 2535
    _allowed_types = tuple([u'SOA'] + [x for x in _record_types if x != u'SIG'])

    parts = (
        StrEnum('type_covered',
            label=_('Type Covered'),
            values=_allowed_types,
        ),
        Int('algorithm',
            label=_('Algorithm'),
            minvalue=0,
            maxvalue=255,
        ),
        Int('labels',
            label=_('Labels'),
            minvalue=0,
            maxvalue=255,
        ),
        Int('original_ttl',
            label=_('Original TTL'),
            minvalue=0,
        ),
        Str('signature_expiration',
            _sig_time_validator,
            label=_('Signature Expiration'),
        ),
        Str('signature_inception',
            _sig_time_validator,
            label=_('Signature Inception'),
        ),
        Int('key_tag',
            label=_('Key Tag'),
            minvalue=0,
            maxvalue=65535,
        ),
        Str('signers_name',
            label=_('Signer\'s Name'),
        ),
        Str('signature',
            label=_('Signature'),
        ),
    )

class SPFRecord(DNSRecord):
    rrtype = 'SPF'
    rfc = 4408
    supported = False

class RRSIGRecord(SIGRecord):
    rrtype = 'RRSIG'
    rfc = 4034

class SSHFPRecord(DNSRecord):
    rrtype = 'SSHFP'
    rfc = 4255
    parts = (
        Int('algorithm',
            label=_('Algorithm'),
            minvalue=0,
            maxvalue=255,
        ),
        Int('fp_type',
            label=_('Fingerprint Type'),
            minvalue=0,
            maxvalue=255,
        ),
        Str('fingerprint',
            label=_('Fingerprint'),
        ),
    )

class TARecord(DNSRecord):
    rrtype = 'TA'
    supported = False

class TKEYRecord(DNSRecord):
    rrtype = 'TKEY'
    supported = False

class TSIGRecord(DNSRecord):
    rrtype = 'TSIG'
    supported = False

class TXTRecord(DNSRecord):
    rrtype = 'TXT'
    rfc = 1035
    parts = (
        Str('data',
            label=_('Text Data'),
        ),
    )

    def _get_part_values(self, value):
        # ignore any space in TXT record
        return (value,)

_dns_records = (
    ARecord(),
    AAAARecord(),
    A6Record(),
    AFSDBRecord(),
    APLRecord(),
    CERTRecord(),
    CNAMERecord(),
    DHCIDRecord(),
    DLVRecord(),
    DNAMERecord(),
    DNSKEYRecord(),
    DSRecord(),
    HIPRecord(),
    IPSECKEYRecord(),
    KEYRecord(),
    KXRecord(),
    LOCRecord(),
    MXRecord(),
    NAPTRRecord(),
    NSRecord(),
    NSECRecord(),
    NSEC3Record(),
    NSEC3PARAMRecord(),
    PTRRecord(),
    RRSIGRecord(),
    RPRecord(),
    SIGRecord(),
    SPFRecord(),
    SRVRecord(),
    SSHFPRecord(),
    TARecord(),
    TKEYRecord(),
    TSIGRecord(),
    TXTRecord(),
)

def __dns_record_options_iter():
    for opt in (Any('dnsrecords?',
                    label=_('Records'),
                    flags=['no_create', 'no_search', 'no_update'],),
                Str('dnstype?',
                    label=_('Record type'),
                    flags=['no_create', 'no_search', 'no_update'],),
                Str('dnsdata?',
                    label=_('Record data'),
                    flags=['no_create', 'no_search', 'no_update'],)):
        # These 3 options are used in --structured format. They are defined
        # rather in takes_params than has_output_params because of their
        # order - they should be printed to CLI before any DNS part param
        yield opt
    for option in _dns_records:
        yield option

        for part in option.get_parts():
            yield part

        for extra in option.get_extra():
            yield extra

_dns_record_options = tuple(__dns_record_options_iter())
_dns_supported_record_types = tuple(record.rrtype for record in _dns_records \
                                    if record.supported)

# dictionary of valid reverse zone -> number of address components
_valid_reverse_zones = {
    '.in-addr.arpa.' : 4,
    '.ip6.arpa.' : 32,
}

def zone_is_reverse(zone_name):
    for rev_zone_name in _valid_reverse_zones.keys():
        if zone_name.endswith(rev_zone_name):
            return True

    return False

def check_ns_rec_resolvable(zone, name):
    if not name.endswith('.'):
        # this is a DNS name relative to the zone
        zone = dns.name.from_text(zone)
        name = unicode(dns.name.from_text(name, origin=zone))
    try:
        return api.Command['dns_resolve'](name)
    except errors.NotFound:
        raise errors.NotFound(
            reason=_('Nameserver \'%(host)s\' does not have a corresponding A/AAAA record') % {'host': name}
        )

def dns_container_exists(ldap):
    try:
        ldap.get_entry(api.env.container_dns, [])
    except errors.NotFound:
        return False
    return True

def default_zone_update_policy(zone):
    if zone_is_reverse(zone):
        return get_dns_reverse_zone_update_policy(api.env.realm, zone)
    else:
        return get_dns_forward_zone_update_policy(api.env.realm)

dnszone_output_params = (
    Str('managedby',
        label=_('Managedby permission'),
    ),
)

class dnszone(LDAPObject):
    """
    DNS Zone, container for resource records.
    """
    container_dn = api.env.container_dns
    object_name = _('DNS zone')
    object_name_plural = _('DNS zones')
    object_class = ['top', 'idnsrecord', 'idnszone']
    possible_objectclasses = ['ipadnszone']
    default_attributes = [
        'idnsname', 'idnszoneactive', 'idnssoamname', 'idnssoarname',
        'idnssoaserial', 'idnssoarefresh', 'idnssoaretry', 'idnssoaexpire',
        'idnssoaminimum', 'idnsallowquery', 'idnsallowtransfer',
        'idnsforwarders', 'idnsforwardpolicy'
    ] + _record_attributes
    label = _('DNS Zones')
    label_singular = _('DNS Zone')

    takes_params = (
        Str('idnsname',
            _domain_name_validator,
            cli_name='name',
            label=_('Zone name'),
            doc=_('Zone name (FQDN)'),
            default_from=lambda name_from_ip: _reverse_zone_name(name_from_ip),
            normalizer=lambda value: value.lower(),
            primary_key=True,
        ),
        Str('name_from_ip?', _validate_ipnet,
            label=_('Reverse zone IP network'),
            doc=_('IP network to create reverse zone name from'),
            flags=('virtual_attribute',),
        ),
        Str('idnssoamname',
            cli_name='name_server',
            label=_('Authoritative nameserver'),
            doc=_('Authoritative nameserver domain name'),
        ),
        Str('idnssoarname',
            _rname_validator,
            cli_name='admin_email',
            label=_('Administrator e-mail address'),
            doc=_('Administrator e-mail address'),
            default_from=lambda idnsname: 'hostmaster.%s' % idnsname,
            normalizer=normalize_zonemgr,
        ),
        Int('idnssoaserial',
            cli_name='serial',
            label=_('SOA serial'),
            doc=_('SOA record serial number'),
            minvalue=1,
            default_from=_create_zone_serial,
            autofill=True,
        ),
        Int('idnssoarefresh',
            cli_name='refresh',
            label=_('SOA refresh'),
            doc=_('SOA record refresh time'),
            minvalue=0,
            default=3600,
            autofill=True,
        ),
        Int('idnssoaretry',
            cli_name='retry',
            label=_('SOA retry'),
            doc=_('SOA record retry time'),
            minvalue=0,
            default=900,
            autofill=True,
        ),
        Int('idnssoaexpire',
            cli_name='expire',
            label=_('SOA expire'),
            doc=_('SOA record expire time'),
            default=1209600,
            minvalue=0,
            autofill=True,
        ),
        Int('idnssoaminimum',
            cli_name='minimum',
            label=_('SOA minimum'),
            doc=_('How long should negative responses be cached'),
            default=3600,
            minvalue=0,
            maxvalue=10800,
            autofill=True,
        ),
        Int('dnsttl?',
            cli_name='ttl',
            label=_('SOA time to live'),
            doc=_('SOA record time to live'),
        ),
        StrEnum('dnsclass?',
            cli_name='class',
            label=_('SOA class'),
            doc=_('SOA record class'),
            values=_record_classes,
        ),
        Str('idnsupdatepolicy?',
            cli_name='update_policy',
            label=_('BIND update policy'),
            doc=_('BIND update policy'),
            default_from=lambda idnsname: default_zone_update_policy(idnsname),
            autofill=True
        ),
        Bool('idnszoneactive?',
            cli_name='zone_active',
            label=_('Active zone'),
            doc=_('Is zone active?'),
            flags=['no_create', 'no_update'],
            attribute=True,
        ),
        Bool('idnsallowdynupdate?',
            cli_name='dynamic_update',
            label=_('Dynamic update'),
            doc=_('Allow dynamic updates.'),
            attribute=True,
            default=False,
            autofill=True
        ),
        Str('idnsallowquery?',
            _validate_bind_aci,
            normalizer=_normalize_bind_aci,
            cli_name='allow_query',
            label=_('Allow query'),
            doc=_('Semicolon separated list of IP addresses or networks which are allowed to issue queries'),
            default=u'any;',   # anyone can issue queries by default
            autofill=True,
        ),
        Str('idnsallowtransfer?',
            _validate_bind_aci,
            normalizer=_normalize_bind_aci,
            cli_name='allow_transfer',
            label=_('Allow transfer'),
            doc=_('Semicolon separated list of IP addresses or networks which are allowed to transfer the zone'),
            default=u'none;',  # no one can issue queries by default
            autofill=True,
        ),
        Str('idnsforwarders*',
            _validate_bind_forwarder,
            cli_name='forwarder',
            label=_('Zone forwarders'),
            doc=_('A list of per-zone forwarders. A custom port can be specified '
                  'for each forwarder using a standard format "IP_ADDRESS port PORT"'),
            csv=True,
        ),
        StrEnum('idnsforwardpolicy?',
            cli_name='forward_policy',
            label=_('Forward policy'),
            values=(u'only', u'first',),
        ),
        Bool('idnsallowsyncptr?',
            cli_name='allow_sync_ptr',
            label=_('Allow PTR sync'),
            doc=_('Allow synchronization of forward (A, AAAA) and reverse (PTR) records in the zone'),
        ),
    )

    def get_dn(self, *keys, **options):
        zone = keys[-1]
        dn = super(dnszone, self).get_dn(zone, **options)
        try:
            self.backend.get_entry(dn, [''])
        except errors.NotFound:
            if zone.endswith(u'.'):
                zone = zone[:-1]
            else:
                zone = zone + u'.'
            test_dn = super(dnszone, self).get_dn(zone, **options)

            try:
                (dn, entry_attrs) = self.backend.get_entry(test_dn, [''])
            except errors.NotFound:
                pass

        return dn

    def permission_name(self, zone):
        return u"Manage DNS zone %s" % zone

api.register(dnszone)


class dnszone_add(LDAPCreate):
    __doc__ = _('Create new DNS zone (SOA record).')

    has_output_params = LDAPCreate.has_output_params + dnszone_output_params
    takes_options = LDAPCreate.takes_options + (
        Flag('force',
             label=_('Force'),
             doc=_('Force DNS zone creation even if nameserver not in DNS.'),
        ),
        Str('ip_address?', _validate_ipaddr,
            doc=_('Add the nameserver to DNS with this IP address'),
        ),
    )

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        assert isinstance(dn, DN)
        if not dns_container_exists(self.api.Backend.ldap2):
            raise errors.NotFound(reason=_('DNS is not configured'))

        entry_attrs['idnszoneactive'] = 'TRUE'

        # Check nameserver has a forward record
        nameserver = entry_attrs['idnssoamname']

        # NS record must contain domain name
        if valid_ip(nameserver):
            raise errors.ValidationError(name='name-server',
                    error=unicode(_("Nameserver address is not a fully qualified domain name")))

        if nameserver[-1] != '.':
            nameserver += '.'

        if not 'ip_address' in options and not options['force']:
            check_ns_rec_resolvable(keys[0], nameserver)

        entry_attrs['nsrecord'] = nameserver
        entry_attrs['idnssoamname'] = nameserver
        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        if 'ip_address' in options:
            nameserver = entry_attrs['idnssoamname'][0][:-1] # ends with a dot
            nsparts = nameserver.split('.')
            add_forward_record('.'.join(nsparts[1:]),
                               nsparts[0],
                               options['ip_address'])

        return dn

api.register(dnszone_add)


class dnszone_del(LDAPDelete):
    __doc__ = _('Delete DNS zone (SOA record).')

    def post_callback(self, ldap, dn, *keys, **options):
        try:
            api.Command['permission_del'](self.obj.permission_name(keys[-1]),
                    force=True)
        except errors.NotFound:
            pass
        return True

api.register(dnszone_del)


class dnszone_mod(LDAPUpdate):
    __doc__ = _('Modify DNS zone (SOA record).')

    has_output_params = LDAPUpdate.has_output_params + dnszone_output_params

api.register(dnszone_mod)


class dnszone_find(LDAPSearch):
    __doc__ = _('Search for DNS zones (SOA records).')

    has_output_params = LDAPSearch.has_output_params + dnszone_output_params

    def args_options_2_params(self, *args, **options):
        # FIXME: Check that name_from_ip is valid. This is necessary because
        #        custom validation rules, including _validate_ipnet, are not
        #        used when doing a search. Once we have a parameter type for
        #        IP network objects, this will no longer be necessary, as the
        #        parameter type will handle the validation itself (see
        #        <https://fedorahosted.org/freeipa/ticket/2266>).
        if 'name_from_ip' in options:
            self.obj.params['name_from_ip'](unicode(options['name_from_ip']))
        return super(dnszone_find, self).args_options_2_params(*args, **options)

    def args_options_2_entry(self, *args, **options):
        if 'name_from_ip' in options:
            if 'idnsname' not in options:
                options['idnsname'] = self.obj.params['idnsname'].get_default(**options)
            del options['name_from_ip']
        return super(dnszone_find, self).args_options_2_entry(*args, **options)

    takes_options = LDAPSearch.takes_options + (
        Flag('forward_only',
            label=_('Forward zones only'),
            cli_name='forward_only',
            doc=_('Search for forward zones only'),
        ),
    )

    def pre_callback(self, ldap, filter, attrs_list, base_dn, scope, *args, **options):
        assert isinstance(base_dn, DN)
        if options.get('forward_only', False):
            search_kw = {}
            search_kw['idnsname'] = _valid_reverse_zones.keys()
            rev_zone_filter = ldap.make_filter(search_kw, rules=ldap.MATCH_NONE, exact=False,
                    trailing_wildcard=False)
            filter = ldap.combine_filters((rev_zone_filter, filter), rules=ldap.MATCH_ALL)

        return (filter, base_dn, scope)


api.register(dnszone_find)


class dnszone_show(LDAPRetrieve):
    __doc__ = _('Display information about a DNS zone (SOA record).')

    has_output_params = LDAPRetrieve.has_output_params + dnszone_output_params

api.register(dnszone_show)


class dnszone_disable(LDAPQuery):
    __doc__ = _('Disable DNS Zone.')

    has_output = output.standard_value
    msg_summary = _('Disabled DNS zone "%(value)s"')

    def execute(self, *keys, **options):
        ldap = self.obj.backend

        dn = self.obj.get_dn(*keys, **options)

        try:
            ldap.update_entry(dn, {'idnszoneactive': 'FALSE'})
        except errors.EmptyModlist:
            pass

        return dict(result=True, value=keys[-1])

api.register(dnszone_disable)


class dnszone_enable(LDAPQuery):
    __doc__ = _('Enable DNS Zone.')

    has_output = output.standard_value
    msg_summary = _('Enabled DNS zone "%(value)s"')

    def execute(self, *keys, **options):
        ldap = self.obj.backend

        dn = self.obj.get_dn(*keys, **options)

        try:
            ldap.update_entry(dn, {'idnszoneactive': 'TRUE'})
        except errors.EmptyModlist:
            pass

        return dict(result=True, value=keys[-1])

api.register(dnszone_enable)

class dnszone_add_permission(LDAPQuery):
    __doc__ = _('Add a permission for per-zone access delegation.')

    has_output = output.standard_value
    msg_summary = _('Added system permission "%(value)s"')

    def execute(self, *keys, **options):
        ldap = self.obj.backend
        dn = self.obj.get_dn(*keys, **options)

        try:
            (dn_, entry_attrs) = ldap.get_entry(dn, ['objectclass'])
        except errors.NotFound:
            self.obj.handle_not_found(*keys)

        permission_name = self.obj.permission_name(keys[-1])
        permission = api.Command['permission_add_noaci'](permission_name,
                         permissiontype=u'SYSTEM'
                     )['result']

        update = {}
        dnszone_ocs = entry_attrs.get('objectclass')
        if dnszone_ocs:
            dnszone_ocs.append('ipadnszone')
            update['objectclass'] = list(set(dnszone_ocs))

        update['managedby'] = [permission['dn']]
        ldap.update_entry(dn, update)

        return dict(
            result=True,
            value=permission_name,
        )

api.register(dnszone_add_permission)

class dnszone_remove_permission(LDAPQuery):
    __doc__ = _('Remove a permission for per-zone access delegation.')

    has_output = output.standard_value
    msg_summary = _('Removed system permission "%(value)s"')

    def execute(self, *keys, **options):
        ldap = self.obj.backend
        dn = self.obj.get_dn(*keys, **options)

        try:
            ldap.update_entry(dn, {'managedby': None})
        except errors.NotFound:
            self.obj.handle_not_found(*keys)
        except errors.EmptyModlist:
            # managedBy attribute is clean, lets make sure there is also no
            # dangling DNS zone permission
            pass

        permission_name = self.obj.permission_name(keys[-1])
        api.Command['permission_del'](permission_name, force=True)

        return dict(
            result=True,
            value=permission_name,
        )

api.register(dnszone_remove_permission)

class dnsrecord(LDAPObject):
    """
    DNS record.
    """
    parent_object = 'dnszone'
    container_dn = api.env.container_dns
    object_name = _('DNS resource record')
    object_name_plural = _('DNS resource records')
    object_class = ['top', 'idnsrecord']
    default_attributes = ['idnsname'] + _record_attributes
    rdn_is_primary_key = True

    label = _('DNS Resource Records')
    label_singular = _('DNS Resource Record')

    takes_params = (
        Str('idnsname',
            _dns_record_name_validator,
            cli_name='name',
            label=_('Record name'),
            doc=_('Record name'),
            primary_key=True,
        ),
        Int('dnsttl?',
            cli_name='ttl',
            label=_('Time to live'),
            doc=_('Time to live'),
        ),
        StrEnum('dnsclass?',
            cli_name='class',
            label=_('Class'),
            doc=_('DNS class'),
            values=_record_classes,
        ),
    ) + _dns_record_options

    structured_flag = Flag('structured',
                           label=_('Structured'),
                           doc=_('Parse all raw DNS records and return them in a structured way'),
                           )

    def _nsrecord_pre_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        nsrecords = entry_attrs.get('nsrecord')
        if options.get('force', False) or nsrecords is None:
            return
        for nsrecord in nsrecords:
            check_ns_rec_resolvable(keys[0], nsrecord)

    def _ptrrecord_pre_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        ptrrecords = entry_attrs.get('ptrrecord')
        if ptrrecords is None:
            return
        zone = keys[-2]
        if self.is_pkey_zone_record(*keys):
            addr = u''
        else:
            addr = keys[-1]
        zone_len = 0
        for valid_zone in _valid_reverse_zones:
            if zone.find(valid_zone) != -1:
                zone = zone.replace(valid_zone,'')
                zone_name = valid_zone
                zone_len = _valid_reverse_zones[valid_zone]

        if not zone_len:
            allowed_zones = ', '.join(_valid_reverse_zones)
            raise errors.ValidationError(name='ptrrecord',
                    error=unicode(_('Reverse zone for PTR record should be a sub-zone of one the following fully qualified domains: %s') % allowed_zones))

        addr_len = len(addr.split('.')) if addr else 0
        ip_addr_comp_count = addr_len + len(zone.split('.'))
        if ip_addr_comp_count != zone_len:
            raise errors.ValidationError(name='ptrrecord',
                error=unicode(_('Reverse zone %(name)s requires exactly %(count)d IP address components, %(user_count)d given')
                % dict(name=zone_name, count=zone_len, user_count=ip_addr_comp_count)))

    def run_precallback_validators(self, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        ldap = self.api.Backend.ldap2

        for rtype in entry_attrs:
            rtype_cb = getattr(self, '_%s_pre_callback' % rtype, None)
            if rtype_cb:
                rtype_cb(ldap, dn, entry_attrs, *keys, **options)

    def is_pkey_zone_record(self, *keys):
        idnsname = keys[-1]
        if idnsname == str(_dns_zone_record) or idnsname == ('%s.' % keys[-2]):
            return True
        return False

    def get_dn(self, *keys, **options):
        if self.is_pkey_zone_record(*keys):
            dn = self.api.Object[self.parent_object].get_dn(*keys[:-1], **options)
            # zone must exist
            ldap = self.api.Backend.ldap2
            try:
                (dn_, zone) = ldap.get_entry(dn, [])
            except errors.NotFound:
                self.api.Object['dnszone'].handle_not_found(keys[-2])
            return self.api.Object[self.parent_object].get_dn(*keys[:-1], **options)
        return super(dnsrecord, self).get_dn(*keys, **options)

    def attr_to_cli(self, attr):
        try:
            cliname = attr[:-len('record')].upper()
        except IndexError:
            cliname = attr
        return cliname

    def get_dns_masters(self):
        ldap = self.api.Backend.ldap2
        base_dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), self.api.env.basedn)
        ldap_filter = '(&(objectClass=ipaConfigObject)(cn=DNS))'
        dns_masters = []

        try:
            entries = ldap.find_entries(filter=ldap_filter, base_dn=base_dn)[0]

            for entry in entries:
                master_dn = entry[0]
                assert isinstance(master_dn, DN)
                try:
                    master = master_dn[1]['cn']
                    dns_masters.append(master)
                except (IndexError, KeyError):
                    pass
        except errors.NotFound:
            return []

        return dns_masters

    def has_cli_options(self, options, no_option_msg, allow_empty_attrs=False):
        if any(k in options for k in ('setattr', 'addattr', 'delattr', 'rename')):
            return

        has_options = False
        for attr in options.keys():
            if attr in self.params and not self.params[attr].primary_key:
                if options[attr] or allow_empty_attrs:
                    has_options = True
                    break

        if not has_options:
            raise errors.OptionError(no_option_msg)

    def get_record_entry_attrs(self, entry_attrs):
        return dict((attr, val) for attr,val in entry_attrs.iteritems() \
                    if attr in self.params and not self.params[attr].primary_key)

    def postprocess_record(self, record, **options):
        if options.get('structured', False):
            for attr in record.keys():
                try:
                    param = self.params[attr]
                except KeyError:
                    continue

                if not isinstance(param, DNSRecord):
                    continue
                parts_params = param.get_parts()

                for dnsvalue in record[attr]:
                    dnsentry = {
                            u'dnstype' : unicode(param.rrtype),
                            u'dnsdata' : dnsvalue
                    }
                    values = param._get_part_values(dnsvalue)
                    if values is None:
                        continue
                    for val_id, val in enumerate(values):
                        if val is not None:
                            dnsentry[parts_params[val_id].name] = val
                    record.setdefault('dnsrecords', []).append(dnsentry)
                del record[attr]

    def get_rrparam_from_part(self, part_name):
        """
        Get an instance of DNSRecord parameter that has part_name as its part.
        If such parameter is not found, None is returned

        :param part_name Part parameter name
        """
        try:
            param = self.params[part_name]

            if not any(flag in param.flags for flag in \
                    ('dnsrecord_part', 'dnsrecord_extra')):
                return None

            # All DNS record part or extra parameters contain a name of its
            # parent RR parameter in its hint attribute
            rrparam = self.params[param.hint]
        except (KeyError, AttributeError):
            return None

        return rrparam

    def iterate_rrparams_by_parts(self, kw, skip_extra=False):
        """
        Iterates through all DNSRecord instances that has at least one of its
        parts or extra options in given dictionary. It returns the DNSRecord
        instance only for the first occurence of part/extra option.

        :param kw Dictionary with DNS record parts or extra options
        :param skip_extra Skip DNS record extra options, yield only DNS records
                          with a real record part
        """
        processed = []
        for opt in kw:
            rrparam = self.get_rrparam_from_part(opt)
            if rrparam is None:
                continue

            if skip_extra and 'dnsrecord_extra' in self.params[opt].flags:
                continue

            if rrparam.name not in processed:
                processed.append(rrparam.name)
                yield rrparam

    def check_record_type_collisions(self, old_entry, entry_attrs):
        # Test that only allowed combination of record types was created
        attrs = set(attr for attr in entry_attrs if attr in _record_attributes
                        and entry_attrs[attr])
        attrs.update(attr for attr in old_entry if attr not in entry_attrs)
        try:
            attrs.remove('cnamerecord')
        except KeyError:
            rec_has_cname = False
        else:
            rec_has_cname = True
        # CNAME and PTR record combination is allowed
        attrs.discard('ptrrecord')
        rec_has_other_types = True if attrs else False

        if rec_has_cname and rec_has_other_types:
            raise errors.ValidationError(name='cnamerecord',
                      error=_('CNAME record is not allowed to coexist with any other '
                              'records except PTR'))

api.register(dnsrecord)


class dnsrecord_add(LDAPCreate):
    __doc__ = _('Add new DNS resource record.')

    no_option_msg = 'No options to add a specific record provided.\n' \
            "Command help may be consulted for all supported record types."
    takes_options = LDAPCreate.takes_options + (
        Flag('force',
             label=_('Force'),
             flags=['no_option', 'no_output'],
             doc=_('force NS record creation even if its hostname is not in DNS'),
        ),
        dnsrecord.structured_flag,
    )

    def args_options_2_entry(self, *keys, **options):
        self.obj.has_cli_options(options, self.no_option_msg)
        return super(dnsrecord_add, self).args_options_2_entry(*keys, **options)

    def interactive_prompt_callback(self, kw):
        try:
            self.obj.has_cli_options(kw, self.no_option_msg)

            # Some DNS records were entered, do not use full interactive help
            # We should still ask user for required parts of DNS parts he is
            # trying to add in the same way we do for standard LDAP parameters
            #
            # Do not ask for required parts when any "extra" option is used,
            # it can be used to fill all required params by itself
            new_kw = {}
            for rrparam in self.obj.iterate_rrparams_by_parts(kw, skip_extra=True):
                user_options = rrparam.prompt_missing_parts(self.Backend, kw,
                                                            prompt_optional=False)
                new_kw.update(user_options)
            kw.update(new_kw)
            return
        except errors.OptionError:
            pass

        # check zone type
        if kw['idnsname'] == _dns_zone_record:
            common_types = u', '.join(_zone_top_record_types)
        elif zone_is_reverse(kw['dnszoneidnsname']):
            common_types = u', '.join(_rev_top_record_types)
        else:
            common_types = u', '.join(_top_record_types)

        self.Backend.textui.print_plain(_(u'Please choose a type of DNS resource record to be added'))
        self.Backend.textui.print_plain(_(u'The most common types for this type of zone are: %s\n') %\
                                          common_types)

        ok = False
        while not ok:
            rrtype = self.Backend.textui.prompt(_(u'DNS resource record type'))

            if rrtype is None:
                return

            try:
                name = '%srecord' % rrtype.lower()
                param = self.params[name]

                if not isinstance(param, DNSRecord):
                    raise ValueError()

                if not param.supported:
                    raise ValueError()
            except (KeyError, ValueError):
                all_types = u', '.join(_dns_supported_record_types)
                self.Backend.textui.print_plain(_(u'Invalid or unsupported type. Allowed values are: %s') % all_types)
                continue
            ok = True

        user_options = param.prompt_parts(self.Backend)
        kw.update(user_options)

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        assert isinstance(dn, DN)
        precallback_attrs = []
        processed_attrs = []
        for option in options:
            try:
                param = self.params[option]
            except KeyError:
                continue

            rrparam = self.obj.get_rrparam_from_part(option)
            if rrparam is None:
                continue

            if 'dnsrecord_part' in param.flags:
                if rrparam.name in processed_attrs:
                    # this record was already entered
                    continue
                if rrparam.name in entry_attrs:
                    # this record is entered both via parts and raw records
                    raise errors.ValidationError(name=param.cli_name or param.name,
                            error=_('Raw value of a DNS record was already set by "%(name)s" option') \
                                  % dict(name=rrparam.cli_name or rrparam.name))

                parts = rrparam.get_parts_from_kw(options)
                dnsvalue = [rrparam._convert_scalar(parts)]
                entry_attrs[rrparam.name] = dnsvalue
                processed_attrs.append(rrparam.name)
                continue

            if 'dnsrecord_extra' in param.flags:
                # do not run precallback for unset flags
                if isinstance(param, Flag) and not options[option]:
                    continue
                # extra option is passed, run per-type pre_callback for given RR type
                precallback_attrs.append(rrparam.name)

        # Run pre_callback validators
        self.obj.run_precallback_validators(dn, entry_attrs, *keys, **options)

        # run precallback also for all new RR type attributes in entry_attrs
        for attr in entry_attrs:
            try:
                param = self.params[attr]
            except KeyError:
                continue

            if not isinstance(param, DNSRecord):
                continue
            precallback_attrs.append(attr)

        precallback_attrs = list(set(precallback_attrs))

        for attr in precallback_attrs:
            # run per-type
            try:
                param = self.params[attr]
            except KeyError:
                continue
            param.dnsrecord_add_pre_callback(ldap, dn, entry_attrs, attrs_list, *keys, **options)

        # Store all new attrs so that DNSRecord post callback is called for
        # new attributes only and not for all attributes in the LDAP entry
        setattr(context, 'dnsrecord_precallback_attrs', precallback_attrs)

        # We always want to retrieve all DNS record attributes to test for
        # record type collisions (#2601)
        try:
            (dn_, old_entry) = ldap.get_entry(
                        dn, _record_attributes,
                        normalize=self.obj.normalize_dn)
        except errors.NotFound:
            pass
        else:
            for attr in entry_attrs:
                if attr not in _record_attributes:
                    continue
                if entry_attrs[attr] is None:
                    entry_attrs[attr] = []
                if not isinstance(entry_attrs[attr], (tuple, list)):
                    vals = [entry_attrs[attr]]
                else:
                    vals = list(entry_attrs[attr])
                entry_attrs[attr] = list(set(old_entry.get(attr, []) + vals))

            self.obj.check_record_type_collisions(old_entry, entry_attrs)
        return dn

    def exc_callback(self, keys, options, exc, call_func, *call_args, **call_kwargs):
        if call_func.func_name == 'add_entry':
            if isinstance(exc, errors.DuplicateEntry):
                # A new record is being added to existing LDAP DNS object
                # Update can be safely run as old record values has been
                # already merged in pre_callback
                ldap = self.obj.backend
                dn = call_args[0]
                entry_attrs = self.obj.get_record_entry_attrs(call_args[1])
                ldap.update_entry(dn, entry_attrs, **call_kwargs)
                return
        raise exc

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        for attr in getattr(context, 'dnsrecord_precallback_attrs', []):
            param = self.params[attr]
            param.dnsrecord_add_post_callback(ldap, dn, entry_attrs, *keys, **options)

        if self.obj.is_pkey_zone_record(*keys):
            entry_attrs[self.obj.primary_key.name] = [_dns_zone_record]

        self.obj.postprocess_record(entry_attrs, **options)

        return dn

api.register(dnsrecord_add)


class dnsrecord_mod(LDAPUpdate):
    __doc__ = _('Modify a DNS resource record.')

    no_option_msg = 'No options to modify a specific record provided.'

    takes_options = LDAPUpdate.takes_options + (
        dnsrecord.structured_flag,
    )

    def args_options_2_entry(self, *keys, **options):
        self.obj.has_cli_options(options, self.no_option_msg, True)
        return super(dnsrecord_mod, self).args_options_2_entry(*keys, **options)

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list,  *keys, **options):
        assert isinstance(dn, DN)
        if options.get('rename') and self.obj.is_pkey_zone_record(*keys):
            # zone rename is not allowed
            raise errors.ValidationError(name='rename',
                           error=_('DNS zone root record cannot be renamed'))

        # check if any attr should be updated using structured instead of replaced
        # format is recordname : (old_value, new_parts)
        updated_attrs = {}
        for param in self.obj.iterate_rrparams_by_parts(options, skip_extra=True):
            parts = param.get_parts_from_kw(options, raise_on_none=False)

            if parts is None:
                # old-style modification
                continue

            old_value = entry_attrs.get(param.name)
            if not old_value:
                raise errors.RequirementError(name=param.name)
            if isinstance(old_value, (tuple, list)):
                if len(old_value) > 1:
                    raise errors.ValidationError(name=param.name,
                           error=_('DNS records can be only updated one at a time'))
                old_value = old_value[0]

            updated_attrs[param.name] = (old_value, parts)

        # Run pre_callback validators
        self.obj.run_precallback_validators(dn, entry_attrs, *keys, **options)

        # current entry is needed in case of per-dns-record-part updates and
        # for record type collision check
        try:
            (dn_, old_entry) = ldap.get_entry(dn, _record_attributes,
                                              normalize=self.obj.normalize_dn)
        except errors.NotFound:
            if updated_attrs:
                self.obj.handle_not_found(*keys)

        if updated_attrs:
            for attr in updated_attrs:
                param = self.params[attr]
                old_dnsvalue, new_parts = updated_attrs[attr]

                if old_dnsvalue not in old_entry.get(attr, []):
                    attr_name = unicode(param.label or param.name)
                    raise errors.AttrValueNotFound(attr=attr_name,
                                                   value=old_dnsvalue)
                old_entry[attr].remove(old_dnsvalue)

                old_parts = param._get_part_values(old_dnsvalue)
                modified_parts = tuple(part if part is not None else old_parts[part_id] \
                                               for part_id,part in enumerate(new_parts))

                new_dnsvalue = [param._convert_scalar(modified_parts)]
                entry_attrs[attr] = list(set(old_entry[attr] + new_dnsvalue))

        self.obj.check_record_type_collisions(old_entry, entry_attrs)
        return dn

    def execute(self, *keys, **options):
        result = super(dnsrecord_mod, self).execute(*keys, **options)

        # remove if empty
        if not self.obj.is_pkey_zone_record(*keys):
            rename = options.get('rename')
            if rename is not None:
                keys = keys[:-1] + (rename,)
            dn = self.obj.get_dn(*keys, **options)
            ldap = self.obj.backend
            (dn_, old_entry) = ldap.get_entry(
                    dn, _record_attributes,
                    normalize=self.obj.normalize_dn)

            del_all = True
            for attr in old_entry:
                if old_entry[attr]:
                    del_all = False
                    break

            if del_all:
                return self.obj.methods.delentry(*keys)
        return result

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        if self.obj.is_pkey_zone_record(*keys):
            entry_attrs[self.obj.primary_key.name] = [_dns_zone_record]

        self.obj.postprocess_record(entry_attrs, **options)
        return dn

    def interactive_prompt_callback(self, kw):
        try:
            self.obj.has_cli_options(kw, self.no_option_msg, True)
        except errors.OptionError:
            pass
        else:
            # some record type entered, skip this helper
            return

        # get DNS record first so that the NotFound exception is raised
        # before the helper would start
        dns_record = api.Command['dnsrecord_show'](kw['dnszoneidnsname'], kw['idnsname'])['result']
        rec_types = [rec_type for rec_type in dns_record if rec_type in _record_attributes]

        self.Backend.textui.print_plain(_("No option to modify specific record provided."))

        # ask user for records to be removed
        self.Backend.textui.print_plain(_(u'Current DNS record contents:\n'))
        record_params = []

        for attr in dns_record:
            try:
                param = self.params[attr]
            except KeyError:
                continue
            if not isinstance(param, DNSRecord):
                continue

            record_params.append(param)
            rec_type_content = u', '.join(dns_record[param.name])
            self.Backend.textui.print_plain(u'%s: %s' % (param.label, rec_type_content))
        self.Backend.textui.print_plain(u'')

        # ask what records to remove
        for param in record_params:
            rec_values = list(dns_record[param.name])
            for rec_value in dns_record[param.name]:
                rec_values.remove(rec_value)
                mod_value = self.Backend.textui.prompt_yesno(
                        _("Modify %(name)s '%(value)s'?") % dict(name=param.label, value=rec_value), default=False)
                if mod_value is True:
                    user_options = param.prompt_parts(self.Backend, mod_dnsvalue=rec_value)
                    kw[param.name] = [rec_value]
                    kw.update(user_options)

                    if rec_values:
                         self.Backend.textui.print_plain(ngettext(
                            u'%(count)d %(type)s record skipped. Only one value per DNS record type can be modified at one time.',
                            u'%(count)d %(type)s records skipped. Only one value per DNS record type can be modified at one time.',
                            0) % dict(count=len(rec_values), type=param.rrtype))
                         break

api.register(dnsrecord_mod)


class dnsrecord_delentry(LDAPDelete):
    """
    Delete DNS record entry.
    """
    msg_summary = _('Deleted record "%(value)s"')
    NO_CLI = True

api.register(dnsrecord_delentry)


class dnsrecord_del(LDAPUpdate):
    __doc__ = _('Delete DNS resource record.')

    no_option_msg = _('Neither --del-all nor options to delete a specific record provided.\n'\
            "Command help may be consulted for all supported record types.")

    takes_options = (
            Flag('del_all',
                default=False,
                label=_('Delete all associated records'),
            ),
            dnsrecord.structured_flag,
    )

    def get_options(self):
        for option in super(dnsrecord_del, self).get_options():
            if any(flag in option.flags for flag in \
                    ('dnsrecord_part', 'dnsrecord_extra',)):
                continue
            elif option.name in ('rename', ):
                # options only valid for dnsrecord-mod
                continue
            elif isinstance(option, DNSRecord):
                yield option.clone(option_group=None)
                continue
            yield option

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        assert isinstance(dn, DN)
        try:
            (dn_, old_entry) = ldap.get_entry(
                    dn, _record_attributes,
                    normalize=self.obj.normalize_dn)
        except errors.NotFound:
            self.obj.handle_not_found(*keys)

        for attr in entry_attrs.keys():
            if attr not in _record_attributes:
                continue
            if not isinstance(entry_attrs[attr], (tuple, list)):
                vals = [entry_attrs[attr]]
            else:
                vals = entry_attrs[attr]

            for val in vals:
                try:
                    old_entry[attr].remove(val)
                except (KeyError, ValueError):
                    try:
                        param = self.params[attr]
                        attr_name = unicode(param.label or param.name)
                    except:
                        attr_name = attr
                    raise errors.AttrValueNotFound(attr=attr_name,
                                                   value=val)
            entry_attrs[attr] = list(set(old_entry[attr]))

        del_all = False
        if not self.obj.is_pkey_zone_record(*keys):
            record_found = False
            for attr in old_entry:
                if old_entry[attr]:
                    record_found = True
                    break
            del_all = not record_found

        # set del_all flag in context
        # when the flag is enabled, the entire DNS record object is deleted
        # in a post callback
        setattr(context, 'del_all', del_all)

        return dn

    def execute(self, *keys, **options):
        if options.get('del_all', False):
            if self.obj.is_pkey_zone_record(*keys):
                raise errors.ValidationError(
                        name='del_all',
                        error=_('Zone record \'%s\' cannot be deleted') \
                                % _dns_zone_record
                      )
            return self.obj.methods.delentry(*keys)

        result = super(dnsrecord_del, self).execute(*keys, **options)

        if getattr(context, 'del_all', False) and not \
                self.obj.is_pkey_zone_record(*keys):
            return self.obj.methods.delentry(*keys)
        return result

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        if self.obj.is_pkey_zone_record(*keys):
            entry_attrs[self.obj.primary_key.name] = [_dns_zone_record]
        self.obj.postprocess_record(entry_attrs, **options)
        return dn

    def args_options_2_entry(self, *keys, **options):
        self.obj.has_cli_options(options, self.no_option_msg)
        return super(dnsrecord_del, self).args_options_2_entry(*keys, **options)

    def interactive_prompt_callback(self, kw):
        if kw.get('del_all', False):
            return
        try:
            self.obj.has_cli_options(kw, self.no_option_msg)
        except errors.OptionError:
            pass
        else:
            # some record type entered, skip this helper
            return

        # get DNS record first so that the NotFound exception is raised
        # before the helper would start
        dns_record = api.Command['dnsrecord_show'](kw['dnszoneidnsname'], kw['idnsname'])['result']
        rec_types = [rec_type for rec_type in dns_record if rec_type in _record_attributes]

        self.Backend.textui.print_plain(_("No option to delete specific record provided."))
        user_del_all = self.Backend.textui.prompt_yesno(_("Delete all?"), default=False)

        if user_del_all is True:
            kw['del_all'] = True
            return

        # ask user for records to be removed
        self.Backend.textui.print_plain(_(u'Current DNS record contents:\n'))
        present_params = []

        for attr in dns_record:
            try:
                param = self.params[attr]
            except KeyError:
                continue
            if not isinstance(param, DNSRecord):
                continue

            present_params.append(param)
            rec_type_content = u', '.join(dns_record[param.name])
            self.Backend.textui.print_plain(u'%s: %s' % (param.label, rec_type_content))
        self.Backend.textui.print_plain(u'')

        # ask what records to remove
        for param in present_params:
            deleted_values = []
            for rec_value in dns_record[param.name]:
                user_del_value = self.Backend.textui.prompt_yesno(
                        _("Delete %(name)s '%(value)s'?") \
                            % dict(name=param.label, value=rec_value), default=False)
                if user_del_value is True:
                     deleted_values.append(rec_value)
            if deleted_values:
                kw[param.name] = tuple(deleted_values)

api.register(dnsrecord_del)


class dnsrecord_show(LDAPRetrieve):
    __doc__ = _('Display DNS resource.')

    takes_options = LDAPRetrieve.takes_options + (
        dnsrecord.structured_flag,
    )

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        if self.obj.is_pkey_zone_record(*keys):
            entry_attrs[self.obj.primary_key.name] = [_dns_zone_record]
        self.obj.postprocess_record(entry_attrs, **options)
        return dn

api.register(dnsrecord_show)


class dnsrecord_find(LDAPSearch):
    __doc__ = _('Search for DNS resources.')

    takes_options = LDAPSearch.takes_options + (
        dnsrecord.structured_flag,
    )

    def get_options(self):
        for option in super(dnsrecord_find, self).get_options():
            if any(flag in option.flags for flag in \
                    ('dnsrecord_part', 'dnsrecord_extra',)):
                continue
            elif isinstance(option, DNSRecord):
                yield option.clone(option_group=None)
                continue
            yield option

    def pre_callback(self, ldap, filter, attrs_list, base_dn, scope, *args, **options):
        assert isinstance(base_dn, DN)
        # include zone record (root entry) in the search
        return (filter, base_dn, ldap.SCOPE_SUBTREE)

    def post_callback(self, ldap, entries, truncated, *args, **options):
        if entries:
            zone_obj = self.api.Object[self.obj.parent_object]
            zone_dn = zone_obj.get_dn(args[0])
            if entries[0][0] == zone_dn:
                entries[0][1][zone_obj.primary_key.name] = [_dns_zone_record]
            for entry in entries:
                self.obj.postprocess_record(entry[1], **options)

        return truncated

api.register(dnsrecord_find)

class dns_resolve(Command):
    __doc__ = _('Resolve a host name in DNS.')

    has_output = output.standard_value
    msg_summary = _('Found \'%(value)s\'')

    takes_args = (
        Str('hostname',
            label=_('Hostname'),
        ),
    )

    def execute(self, *args, **options):
        query=args[0]
        if query.find(api.env.domain) == -1 and query.find('.') == -1:
            query = '%s.%s.' % (query, api.env.domain)
        if query[-1] != '.':
            query = query + '.'

        if not is_host_resolvable(query):
            raise errors.NotFound(
                reason=_('Host \'%(host)s\' not found') % {'host': query}
            )

        return dict(result=True, value=query)

api.register(dns_resolve)

class dns_is_enabled(Command):
    """
    Checks if any of the servers has the DNS service enabled.
    """
    NO_CLI = True
    has_output = output.standard_value

    base_dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), api.env.basedn)
    filter = '(&(objectClass=ipaConfigObject)(cn=DNS))'

    def execute(self, *args, **options):
        ldap = self.api.Backend.ldap2
        dns_enabled = False

        try:
            ent = ldap.find_entries(filter=self.filter, base_dn=self.base_dn)
            if len(ent):
                dns_enabled = True
        except Exception, e:
            pass

        return dict(result=dns_enabled, value=u'')

api.register(dns_is_enabled)


class dnsconfig(LDAPObject):
    """
    DNS global configuration object
    """
    object_name = _('DNS configuration options')
    default_attributes = [
        'idnsforwardpolicy', 'idnsforwarders', 'idnsallowsyncptr',
        'idnszonerefresh'
    ]

    label = _('DNS Global Configuration')
    label_singular = _('DNS Global Configuration')

    takes_params = (
        Str('idnsforwarders*',
            _validate_bind_forwarder,
            cli_name='forwarder',
            label=_('Global forwarders'),
            doc=_('A list of global forwarders. A custom port can be specified ' \
                  'for each forwarder using a standard format "IP_ADDRESS port PORT"'),
            csv=True,
        ),
        StrEnum('idnsforwardpolicy?',
            cli_name='forward_policy',
            label=_('Forward policy'),
            values=(u'only', u'first',),
        ),
        Bool('idnsallowsyncptr?',
            cli_name='allow_sync_ptr',
            label=_('Allow PTR sync'),
            doc=_('Allow synchronization of forward (A, AAAA) and reverse (PTR) records'),
        ),
        Int('idnszonerefresh?',
            cli_name='zone_refresh',
            label=_('Zone refresh interval'),
            doc=_('An interval between regular polls of the name server for new DNS zones'),
            minvalue=0,
        ),
    )

    def get_dn(self, *keys, **kwargs):
        return api.env.container_dns

    def get_dnsconfig(self, ldap):
        (dn, entry) = ldap.get_entry(self.get_dn(), None,
                           normalize=self.normalize_dn)

        return entry

    def postprocess_result(self, result):
        if not any(param in result['result'] for param in self.params):
            result['summary'] = unicode(_('Global DNS configuration is empty'))

api.register(dnsconfig)


class dnsconfig_mod(LDAPUpdate):
    __doc__ = _('Modify global DNS configuration.')

    def execute(self, *keys, **options):
        result = super(dnsconfig_mod, self).execute(*keys, **options)
        self.obj.postprocess_result(result)
        return result

api.register(dnsconfig_mod)


class dnsconfig_show(LDAPRetrieve):
    __doc__ = _('Show the current global DNS configuration.')

    def execute(self, *keys, **options):
        result = super(dnsconfig_show, self).execute(*keys, **options)
        self.obj.postprocess_result(result)
        return result

api.register(dnsconfig_show)