summaryrefslogtreecommitdiffstats
path: root/src/utils/knotc/commands.c
blob: 5cc1a1452bc4c99df70ab24acdd7eebcb6a5270f (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
/*  Copyright (C) 2024 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>

    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 <https://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libknot/libknot.h"
#include "knot/common/log.h"
#include "knot/ctl/commands.h"
#include "knot/conf/conf.h"
#include "knot/conf/confdb.h"
#include "knot/conf/module.h"
#include "knot/conf/tools.h"
#include "knot/zone/zonefile.h"
#include "knot/zone/zone-load.h"
#include "contrib/color.h"
#include "contrib/macros.h"
#include "contrib/string.h"
#include "contrib/strtonum.h"
#include "contrib/openbsd/strlcat.h"
#include "utils/knotc/commands.h"

#define CMD_EXIT		"exit"

#define CMD_STATUS		"status"
#define CMD_STOP		"stop"
#define CMD_RELOAD		"reload"
#define CMD_STATS		"stats"

#define CMD_ZONE_CHECK		"zone-check"
#define CMD_ZONE_STATUS		"zone-status"
#define CMD_ZONE_RELOAD		"zone-reload"
#define CMD_ZONE_REFRESH	"zone-refresh"
#define CMD_ZONE_RETRANSFER	"zone-retransfer"
#define CMD_ZONE_NOTIFY		"zone-notify"
#define CMD_ZONE_FLUSH		"zone-flush"
#define CMD_ZONE_BACKUP		"zone-backup"
#define CMD_ZONE_RESTORE	"zone-restore"
#define CMD_ZONE_SIGN		"zone-sign"
#define CMD_ZONE_VALIDATE	"zone-validate"
#define CMD_ZONE_KEYS_LOAD	"zone-keys-load"
#define CMD_ZONE_KEY_ROLL	"zone-key-rollover"
#define CMD_ZONE_KSK_SBM	"zone-ksk-submitted"
#define CMD_ZONE_FREEZE		"zone-freeze"
#define CMD_ZONE_THAW		"zone-thaw"
#define CMD_ZONE_XFR_FREEZE	"zone-xfr-freeze"
#define CMD_ZONE_XFR_THAW	"zone-xfr-thaw"

#define CMD_ZONE_READ		"zone-read"
#define CMD_ZONE_BEGIN		"zone-begin"
#define CMD_ZONE_COMMIT		"zone-commit"
#define CMD_ZONE_ABORT		"zone-abort"
#define CMD_ZONE_DIFF		"zone-diff"
#define CMD_ZONE_GET		"zone-get"
#define CMD_ZONE_SET		"zone-set"
#define CMD_ZONE_UNSET		"zone-unset"
#define CMD_ZONE_PURGE		"zone-purge"
#define CMD_ZONE_STATS		"zone-stats"

#define CMD_CONF_INIT		"conf-init"
#define CMD_CONF_CHECK		"conf-check"
#define CMD_CONF_IMPORT		"conf-import"
#define CMD_CONF_EXPORT		"conf-export"
#define CMD_CONF_LIST		"conf-list"
#define CMD_CONF_READ		"conf-read"
#define CMD_CONF_BEGIN		"conf-begin"
#define CMD_CONF_COMMIT		"conf-commit"
#define CMD_CONF_ABORT		"conf-abort"
#define CMD_CONF_DIFF		"conf-diff"
#define CMD_CONF_GET		"conf-get"
#define CMD_CONF_SET		"conf-set"
#define CMD_CONF_UNSET		"conf-unset"

#define CTL_LOG_STR		"failed to control"

#define CTL_SEND(type, data) \
	ret = knot_ctl_send(args->ctl, (type), (data)); \
	if (ret != KNOT_EOK) { \
		log_error(CTL_LOG_STR" (%s)", knot_strerror(ret)); \
		return ret; \
	}

#define CTL_SEND_DATA CTL_SEND(KNOT_CTL_TYPE_DATA, &data)
#define CTL_SEND_BLOCK CTL_SEND(KNOT_CTL_TYPE_BLOCK, NULL)

static int check_args(cmd_args_t *args, int min, int max)
{
	if (max == 0 && args->argc > 0) {
		log_error("command does not take arguments");
		return KNOT_EINVAL;
	} else if (min == max && args->argc != min) {
		log_error("command requires %i arguments", min);
		return KNOT_EINVAL;
	} else if (args->argc < min) {
		log_error("command requires at least %i arguments", min);
		return KNOT_EINVAL;
	} else if (max > 0 && args->argc > max) {
		log_error("command takes at most %i arguments", max);
		return KNOT_EINVAL;
	}

	return KNOT_EOK;
}

static int check_conf_args(cmd_args_t *args)
{
	// Mask relevant flags.
	cmd_flag_t flags = args->desc->flags;
	flags &= CMD_FOPT_ITEM | CMD_FREQ_ITEM | CMD_FOPT_DATA;

	switch (args->argc) {
	case 0:
		if (flags == CMD_FNONE || (flags & CMD_FOPT_ITEM)) {
			return KNOT_EOK;
		}
		break;
	case 1:
		if (flags & (CMD_FOPT_ITEM | CMD_FREQ_ITEM)) {
			return KNOT_EOK;
		}
		break;
	default:
		if (flags != CMD_FNONE) {
			return KNOT_EOK;
		}
		break;
	}

	log_error("invalid number of arguments");

	return KNOT_EINVAL;
}

static int get_conf_key(const char *key, knot_ctl_data_t *data)
{
	// Get key0.
	const char *key0 = key;

	// Check for id.
	char *id = strchr(key, '[');
	if (id != NULL) {
		// Separate key0 and id.
		*id++ = '\0';

		// Check for id end.
		char *id_end = id;
		while ((id_end = strchr(id_end, ']')) != NULL) {
			// Check for escaped character.
			if (*(id_end - 1) != '\\') {
				break;
			}
			id_end++;
		}

		// Check for unclosed id.
		if (id_end == NULL) {
			log_error("(missing bracket after identifier) %s", id);
			return KNOT_EINVAL;
		}

		// Separate id and key1.
		*id_end = '\0';

		key = id_end + 1;

		// Key1 or nothing must follow.
		if (*key != '.' && *key != '\0') {
			log_error("(unexpected token) %s", key);
			return KNOT_EINVAL;
		}
	}

	// Check for key1.
	char *key1 = strchr(key, '.');
	if (key1 != NULL) {
		// Separate key0/id and key1.
		*key1++ = '\0';

		if (*key1 == '\0') {
			log_error("(missing item specification)");
			return KNOT_EINVAL;
		}
	}

	(*data)[KNOT_CTL_IDX_SECTION] = key0;
	(*data)[KNOT_CTL_IDX_ITEM] = key1;
	(*data)[KNOT_CTL_IDX_ID] = id;

	return KNOT_EOK;
}

static void format_data(cmd_args_t *args, knot_ctl_type_t data_type,
                        knot_ctl_data_t *data, bool *empty)
{
	const char *error = (*data)[KNOT_CTL_IDX_ERROR];
	const char *flags = (*data)[KNOT_CTL_IDX_FLAGS];
	const char *key0  = (*data)[KNOT_CTL_IDX_SECTION];
	const char *key1  = (*data)[KNOT_CTL_IDX_ITEM];
	const char *id    = (*data)[KNOT_CTL_IDX_ID];
	const char *zone  = (*data)[KNOT_CTL_IDX_ZONE];
	const char *owner = (*data)[KNOT_CTL_IDX_OWNER];
	const char *ttl   = (*data)[KNOT_CTL_IDX_TTL];
	const char *type  = (*data)[KNOT_CTL_IDX_TYPE];
	const char *value = (*data)[KNOT_CTL_IDX_DATA];

	bool col = false;
	char status_col[32] = "";

	static bool first_status_item = true;

	const char *sign = NULL;
	if (ctl_has_flag(flags, CTL_FLAG_DIFF_ADD)) {
		sign = CTL_FLAG_DIFF_ADD;
	} else if (ctl_has_flag(flags, CTL_FLAG_DIFF_REM)) {
		sign = CTL_FLAG_DIFF_REM;
	}

	switch (args->desc->cmd) {
	case CTL_STATUS:
		if (error != NULL) {
			printf("error: (%s)%s%s", error,
			       (type != NULL) ? " "  : "",
			       (type != NULL) ? type : "");
		} else if (value != NULL) {
			printf("%s", value);
			*empty = false;
		}
		break;
	case CTL_STOP:
	case CTL_RELOAD:
	case CTL_CONF_BEGIN:
	case CTL_CONF_ABORT:
		// Only error message is expected here.
		if (error != NULL) {
			printf("error: (%s)", error);
		}
		break;
	case CTL_ZONE_STATUS:
		if (error == NULL) {
			col =  args->extended ? args->color_force : args->color;
		}
		if (!ctl_has_flag(flags, CTL_FLAG_STATUS_EMPTY)) {
			strlcat(status_col, COL_BOLD(col), sizeof(status_col));
		}
		if (ctl_has_flag(flags, CTL_FLAG_STATUS_SLAVE)) {
			strlcat(status_col, COL_RED(col), sizeof(status_col));
		} else {
			strlcat(status_col, COL_GRN(col), sizeof(status_col));
		}
		if (ctl_has_flag(flags, CTL_FLAG_STATUS_MEMBER)) {
			strlcat(status_col, COL_UNDR(col), sizeof(status_col));
		}
		// FALLTHROUGH
	case CTL_ZONE_RELOAD:
	case CTL_ZONE_REFRESH:
	case CTL_ZONE_RETRANSFER:
	case CTL_ZONE_NOTIFY:
	case CTL_ZONE_FLUSH:
	case CTL_ZONE_BACKUP:
	case CTL_ZONE_RESTORE:
	case CTL_ZONE_SIGN:
	case CTL_ZONE_VALIDATE:
	case CTL_ZONE_KEYS_LOAD:
	case CTL_ZONE_KEY_ROLL:
	case CTL_ZONE_KSK_SBM:
	case CTL_ZONE_FREEZE:
	case CTL_ZONE_THAW:
	case CTL_ZONE_BEGIN:
	case CTL_ZONE_COMMIT:
	case CTL_ZONE_ABORT:
	case CTL_ZONE_PURGE:
		if (data_type == KNOT_CTL_TYPE_DATA) {
			printf("%s%s%s%s%s%s%s%s%s%s",
			       (!(*empty)     ? "\n"          : ""),
			       (error != NULL ? "error: "     : ""),
			       (zone  != NULL ? "["           : ""),
			       (zone  != NULL ? status_col    : ""),
			       (zone  != NULL ? zone          : ""),
			       (zone  != NULL ? COL_RST(col)  : ""),
			       (zone  != NULL ? "]"           : ""),
			       (error != NULL ? " ("          : ""),
			       (error != NULL ? error         : ""),
			       (error != NULL ? ")"           : ""));
			*empty = false;
		}
		if (args->desc->cmd == CTL_ZONE_STATUS && type != NULL) {
			if (data_type == KNOT_CTL_TYPE_DATA) {
				first_status_item = true;
			}
			if (!args->extended &&
			    (value == 0 || strcmp(value, STATUS_EMPTY) == 0) &&
			    strcmp(type, "serial") != 0) {
				return;
			}

			printf("%s %s: %s%s%s",
			       (first_status_item ? "" : " |"),
			       type, COL_BOLD(col), value, COL_RST(col));
			first_status_item = false;
		}
		break;
	case CTL_CONF_COMMIT: // Can return a check error context.
	case CTL_CONF_LIST:
	case CTL_CONF_READ:
	case CTL_CONF_DIFF:
	case CTL_CONF_GET:
	case CTL_CONF_SET:
	case CTL_CONF_UNSET:
		if (data_type == KNOT_CTL_TYPE_DATA) {
			printf("%s%s%s%s%s%s%s%s%s%s%s%s",
			       (!(*empty)     ? "\n"       : ""),
			       (error != NULL ? "error: (" : ""),
			       (error != NULL ? error      : ""),
			       (error != NULL ? ") "       : ""),
			       (sign  != NULL ? sign       : ""),
			       (key0  != NULL ? key0       : ""),
			       (id    != NULL ? "["        : ""),
			       (id    != NULL ? id         : ""),
			       (id    != NULL ? "]"        : ""),
			       (key1  != NULL ? "."        : ""),
			       (key1  != NULL ? key1       : ""),
			       (value != NULL ? " ="       : ""));
			*empty = false;
		}
		if (value != NULL) {
			printf(" %s", value);
		}
		break;
	case CTL_ZONE_READ:
	case CTL_ZONE_DIFF:
	case CTL_ZONE_GET:
	case CTL_ZONE_SET:
	case CTL_ZONE_UNSET:
		printf("%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
		       (!(*empty)     ? "\n"       : ""),
		       (error != NULL ? "error: (" : ""),
		       (error != NULL ? error      : ""),
		       (error != NULL ? ") "       : ""),
		       (zone  != NULL ? "["        : ""),
		       (zone  != NULL ? zone       : ""),
		       (zone  != NULL ? "] "       : ""),
		       (sign  != NULL ? sign       : ""),
		       (owner != NULL ? owner      : ""),
		       (ttl   != NULL ? " "        : ""),
		       (ttl   != NULL ? ttl        : ""),
		       (type  != NULL ? " "        : ""),
		       (type  != NULL ? type       : ""),
		       (value != NULL ? " "        : ""),
		       (value != NULL ? value      : ""));
		*empty = false;
		break;
	case CTL_STATS:
	case CTL_ZONE_STATS:
		printf("%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
		       (!(*empty)     ? "\n"       : ""),
		       (error != NULL ? "error: (" : ""),
		       (error != NULL ? error      : ""),
		       (error != NULL ? ") "       : ""),
		       (zone  != NULL ? "["        : ""),
		       (zone  != NULL ? zone       : ""),
		       (zone  != NULL ? "] "       : ""),
		       (key0  != NULL ? key0       : ""),
		       (key1  != NULL ? "."        : ""),
		       (key1  != NULL ? key1       : ""),
		       (id    != NULL ? "["        : ""),
		       (id    != NULL ? id         : ""),
		       (id    != NULL ? "]"        : ""),
		       (value != NULL ? " = "      : ""),
		       (value != NULL ? value      : ""));
		*empty = false;
		break;
	default:
		assert(0);
	}
}

static void format_block(ctl_cmd_t cmd, bool failed, bool empty)
{
	switch (cmd) {
	case CTL_STATUS:
		printf("%s\n", (failed || !empty) ? "" : "Running");
		break;
	case CTL_STOP:
		printf("%s\n", failed ? "" : "Stopped");
		break;
	case CTL_RELOAD:
		printf("%s\n", failed ? "" : "Reloaded");
		break;
	case CTL_CONF_BEGIN:
	case CTL_CONF_COMMIT:
	case CTL_CONF_ABORT:
	case CTL_CONF_SET:
	case CTL_CONF_UNSET:
	case CTL_ZONE_RELOAD:
	case CTL_ZONE_REFRESH:
	case CTL_ZONE_RETRANSFER:
	case CTL_ZONE_NOTIFY:
	case CTL_ZONE_FLUSH:
	case CTL_ZONE_BACKUP:
	case CTL_ZONE_RESTORE:
	case CTL_ZONE_SIGN:
	case CTL_ZONE_VALIDATE:
	case CTL_ZONE_KEYS_LOAD:
	case CTL_ZONE_KEY_ROLL:
	case CTL_ZONE_KSK_SBM:
	case CTL_ZONE_FREEZE:
	case CTL_ZONE_THAW:
	case CTL_ZONE_XFR_FREEZE:
	case CTL_ZONE_XFR_THAW:
	case CTL_ZONE_BEGIN:
	case CTL_ZONE_COMMIT:
	case CTL_ZONE_ABORT:
	case CTL_ZONE_SET:
	case CTL_ZONE_UNSET:
	case CTL_ZONE_PURGE:
		printf("%s\n", failed ? "" : "OK");
		break;
	case CTL_ZONE_STATUS:
	case CTL_ZONE_READ:
	case CTL_ZONE_DIFF:
	case CTL_ZONE_GET:
	case CTL_CONF_LIST:
	case CTL_CONF_READ:
	case CTL_CONF_DIFF:
	case CTL_CONF_GET:
	case CTL_ZONE_STATS:
	case CTL_STATS:
		printf("%s", empty ? "" : "\n");
		break;
	default:
		assert(0);
	}
}

static int ctl_receive(cmd_args_t *args)
{
	bool failed = false;
	bool empty = true;

	while (true) {
		knot_ctl_type_t type;
		knot_ctl_data_t data;

		int ret = knot_ctl_receive(args->ctl, &type, &data);
		if (ret != KNOT_EOK) {
			log_error(CTL_LOG_STR" (%s)", knot_strerror(ret));
			return ret;
		}

		switch (type) {
		case KNOT_CTL_TYPE_END:
			log_error(CTL_LOG_STR" (%s)", knot_strerror(KNOT_EMALF));
			return KNOT_EMALF;
		case KNOT_CTL_TYPE_BLOCK:
			format_block(args->desc->cmd, failed, empty);
			return failed ? KNOT_ERROR : KNOT_EOK;
		case KNOT_CTL_TYPE_DATA:
		case KNOT_CTL_TYPE_EXTRA:
			format_data(args, type, &data, &empty);
			break;
		default:
			assert(0);
			return KNOT_EINVAL;
		}

		if (data[KNOT_CTL_IDX_ERROR] != NULL) {
			failed = true;
		}
	}

	return KNOT_EOK;
}

static int cmd_ctl(cmd_args_t *args)
{
	int ret = check_args(args, 0, (args->desc->cmd == CTL_STATUS ? 1 : 0));
	if (ret != KNOT_EOK) {
		return ret;
	}

	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
		[KNOT_CTL_IDX_TYPE] = args->argc > 0 ? args->argv[0] : NULL
	};

	CTL_SEND_DATA
	CTL_SEND_BLOCK

	return ctl_receive(args);
}

static int set_stats_items(cmd_args_t *args, knot_ctl_data_t *data)
{
	int min_args, max_args;
	switch (args->desc->cmd) {
	case CTL_STATS:      min_args = 0; max_args = 1; break;
	case CTL_ZONE_STATS: min_args = 1; max_args = 2; break;
	default:
		assert(0);
		return KNOT_EINVAL;
	}

	// Check the number of arguments.
	int ret = check_args(args, min_args, max_args);
	if (ret != KNOT_EOK) {
		return ret;
	}

	int idx = 0;

	// Set ZONE name.
	if (args->argc > idx && args->desc->cmd == CTL_ZONE_STATS) {
		if (strcmp(args->argv[idx], "--") != 0) {
			(*data)[KNOT_CTL_IDX_ZONE] = args->argv[idx];
		}
		idx++;
	}

	if (args->argc > idx) {
		(*data)[KNOT_CTL_IDX_SECTION] = args->argv[idx];

		char *item = strchr(args->argv[idx], '.');
		if (item != NULL) {
			// Separate section and item.
			*item++ = '\0';
			(*data)[KNOT_CTL_IDX_ITEM] = item;
		}
	}

	return KNOT_EOK;
}

static int cmd_stats_ctl(cmd_args_t *args)
{
	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
	};

	int ret = set_stats_items(args, &data);
	if (ret != KNOT_EOK) {
		return ret;
	}

	CTL_SEND_DATA
	CTL_SEND_BLOCK

	return ctl_receive(args);
}

static int zone_exec(cmd_args_t *args, int (*fcn)(const knot_dname_t *, void *),
                     void *data)
{
	bool failed = false;

	// Process specified zones.
	if (args->argc > 0) {
		knot_dname_storage_t id;

		for (int i = 0; i < args->argc; i++) {
			if (knot_dname_from_str(id, args->argv[i], sizeof(id)) == NULL) {
				log_zone_str_error(args->argv[i], "invalid name");
				failed = true;
				continue;
			}
			knot_dname_to_lower(id);

			if (!conf_rawid_exists(conf(), C_ZONE, id, knot_dname_size(id))) {
				log_zone_error(id, "%s", knot_strerror(KNOT_ENOZONE));
				failed = true;
				continue;
			}

			if (fcn(id, data) != KNOT_EOK) {
				failed = true;
			}
		}
	// Process all configured zones.
	} else {
		for (conf_iter_t iter = conf_iter(conf(), C_ZONE);
		     iter.code == KNOT_EOK; conf_iter_next(conf(), &iter)) {
			conf_val_t val = conf_iter_id(conf(), &iter);
			const knot_dname_t *id = conf_dname(&val);

			if (fcn(id, data) != KNOT_EOK) {
				failed = true;
			}
		}
	}

	return failed ? KNOT_ERROR : KNOT_EOK;
}

static int zone_check(const knot_dname_t *dname, void *data)
{
	cmd_args_t *args = data;

	conf_val_t load = conf_zone_get(conf(), C_ZONEFILE_LOAD, dname);
	if (conf_opt(&load) == ZONEFILE_LOAD_NONE) {
		return KNOT_EOK;
	}

	zone_contents_t *contents = NULL;
	conf_val_t mode = conf_zone_get(conf(), C_SEM_CHECKS, dname);
	int ret = zone_load_contents(conf(), dname, &contents, conf_opt(&mode), args->force);
	zone_contents_deep_free(contents);
	if (ret != KNOT_EOK && ret != KNOT_ESEMCHECK) {
		knot_dname_txt_storage_t name;
		(void)knot_dname_to_str(name, dname, sizeof(name));
		log_error("[%s] failed to check zone file (%s)", name, knot_strerror(ret));
	}

	return ret;
}

static int cmd_zone_check(cmd_args_t *args)
{
	return zone_exec(args, zone_check, args);
}

static int cmd_zone_key_roll_ctl(cmd_args_t *args)
{
	int ret = check_args(args, 2, 2);
	if (ret != KNOT_EOK) {
		return ret;
	}

	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
		[KNOT_CTL_IDX_ZONE] = args->argv[0],
		[KNOT_CTL_IDX_TYPE] = args->argv[1],
	};

	CTL_SEND_DATA
	CTL_SEND_BLOCK

	return ctl_receive(args);
}

static int cmd_zone_ctl(cmd_args_t *args)
{
	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
	};

	// Check the number of arguments.
	int ret = check_args(args, (args->desc->flags & CMD_FREQ_ZONE) ? 1 : 0, -1);
	if (ret != KNOT_EOK) {
		return ret;
	}

	if (args->desc->cmd == CTL_ZONE_PURGE && !args->force) {
		log_error("force option required!");
		return KNOT_EDENIED;
	}

	// Ignore all zones argument.
	if (args->argc == 1 && strcmp(args->argv[0], "--") == 0) {
		args->argc = 0;
	}

	if (args->argc == 0) {
		CTL_SEND_DATA
	}
	for (int i = 0; i < args->argc; i++) {
		data[KNOT_CTL_IDX_ZONE] = args->argv[i];

		CTL_SEND_DATA
	}

	CTL_SEND_BLOCK

	return ctl_receive(args);
}

#define FILTER_IMPORT_NOPURGE	 "+nopurge"
#define FILTER_EXPORT_SCHEMA	 "+schema"

typedef struct {
	const char *name;
	char id;
	bool with_data; // Only ONE filter of each filter_desc_t may have data!
} filter_desc_t;

const filter_desc_t zone_flush_filters[] = {
	{ "+outdir", CTL_FILTER_FLUSH_OUTDIR, true },
	{ NULL },
};

const filter_desc_t zone_backup_filters[] = {
	{ "+backupdir",   CTL_FILTER_BACKUP_OUTDIR,      true },
	{ "+zonefile",    CTL_FILTER_BACKUP_ZONEFILE,   false },
	{ "+nozonefile",  CTL_FILTER_BACKUP_NOZONEFILE, false },
	{ "+journal",     CTL_FILTER_BACKUP_JOURNAL,    false },
	{ "+nojournal",   CTL_FILTER_BACKUP_NOJOURNAL,  false },
	{ "+timers",      CTL_FILTER_BACKUP_TIMERS,     false },
	{ "+notimers",    CTL_FILTER_BACKUP_NOTIMERS,   false },
	{ "+kaspdb",      CTL_FILTER_BACKUP_KASPDB,     false },
	{ "+nokaspdb",    CTL_FILTER_BACKUP_NOKASPDB,   false },
	{ "+keysonly",    CTL_FILTER_BACKUP_KEYSONLY,   false },
	{ "+nokeysonly",  CTL_FILTER_BACKUP_NOKEYSONLY, false },
	{ "+catalog",     CTL_FILTER_BACKUP_CATALOG,    false },
	{ "+nocatalog",   CTL_FILTER_BACKUP_NOCATALOG,  false },
	{ "+quic",        CTL_FILTER_BACKUP_QUIC,       false },
	{ "+noquic",      CTL_FILTER_BACKUP_NOQUIC,     false },
	{ NULL },
};

const filter_desc_t zone_status_filters[] = {
	{ "+role",        CTL_FILTER_STATUS_ROLE },
	{ "+serial",      CTL_FILTER_STATUS_SERIAL },
	{ "+transaction", CTL_FILTER_STATUS_TRANSACTION },
	{ "+freeze",      CTL_FILTER_STATUS_FREEZE },
	{ "+catalog",     CTL_FILTER_STATUS_CATALOG },
	{ "+events",      CTL_FILTER_STATUS_EVENTS },
	{ NULL },
};

const filter_desc_t zone_purge_filters[] = {
	{ "+expire",   CTL_FILTER_PURGE_EXPIRE },
	{ "+zonefile", CTL_FILTER_PURGE_ZONEFILE },
	{ "+journal",  CTL_FILTER_PURGE_JOURNAL },
	{ "+timers",   CTL_FILTER_PURGE_TIMERS },
	{ "+kaspdb",   CTL_FILTER_PURGE_KASPDB },
	{ "+catalog",  CTL_FILTER_PURGE_CATALOG },
	{ "+orphan",   CTL_FILTER_PURGE_ORPHAN },
	{ NULL },
};

const filter_desc_t null_filter = { NULL };

#define MAX_FILTERS sizeof(zone_backup_filters) / sizeof(filter_desc_t) - 1

static const filter_desc_t *get_filter(ctl_cmd_t cmd, const char *filter_name)
{
	const filter_desc_t *fd = NULL;
	switch (cmd) {
	case CTL_ZONE_FLUSH:
		fd = zone_flush_filters;
		break;
	case CTL_ZONE_BACKUP:
	case CTL_ZONE_RESTORE:
		fd = zone_backup_filters;
		break;
	case CTL_ZONE_STATUS:
		fd = zone_status_filters;
		break;
	case CTL_ZONE_PURGE:
		fd = zone_purge_filters;
		break;
	default:
		return &null_filter;
	}
	for (size_t i = 0; fd[i].name != NULL; i++) {
		if (strcmp(fd[i].name, filter_name) == 0) {
			return &fd[i];
		}
	}
	return &null_filter;
}

static int cmd_zone_filter_ctl(cmd_args_t *args)
{
	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
	};

	if (args->desc->cmd == CTL_ZONE_PURGE && !args->force) {
		log_error("force option required!");
		return KNOT_EDENIED;
	}

	char filter_buff[MAX_FILTERS + 1] = { 0 };

	// First, process the filters.
	for (int i = 0; i < args->argc; i++) {
		if (args->argv[i][0] == '+') {
			if (data[KNOT_CTL_IDX_FILTER] == NULL) {
				data[KNOT_CTL_IDX_FILTER] = filter_buff;
			}
			char filter_id[2] = { get_filter(args->desc->cmd, args->argv[i])->id, 0 };
			if (filter_id[0] == '\0') {
				log_error("unknown filter: %s", args->argv[i]);
				return KNOT_EINVAL;
			}
			if (strchr(filter_buff, filter_id[0]) == NULL) {
				assert(strlen(filter_buff) < MAX_FILTERS);
				strlcat(filter_buff, filter_id, sizeof(filter_buff));
			}
			if (get_filter(args->desc->cmd, args->argv[i])->with_data) {
				data[KNOT_CTL_IDX_DATA] = args->argv[++i];
			}
		}
	}

	// Second, process zones.
	int ret;
	int sentzones = 0;
	bool twodash = false;
	for (int i = 0; i < args->argc; i++) {
		// Skip filters.
		if (args->argv[i][0] == '+') {
			if (get_filter(args->desc->cmd, args->argv[i])->with_data) {
				i++;
			}
			continue;
		}

		if (strcmp(args->argv[i], "--") != 0) {
			data[KNOT_CTL_IDX_ZONE] = args->argv[i];
			CTL_SEND_DATA
			sentzones++;
		} else {
			twodash = true;
		}
	}

	if ((args->desc->flags & CMD_FREQ_ZONE) && sentzones == 0 && !twodash) {
		log_error("zone must be specified (or -- for all zones)");
		return KNOT_EDENIED;
	}

	if (sentzones == 0) {
		CTL_SEND_DATA
	}
	CTL_SEND_BLOCK

	return ctl_receive(args);
}

static int set_rdata(cmd_args_t *args, int pos, char *rdata, size_t rdata_len)
{
	rdata[0] = '\0';

	for (int i = pos; i < args->argc; i++) {
		if (i > pos && strlcat(rdata, " ", rdata_len) >= rdata_len) {
			return KNOT_ESPACE;
		}
		if (strlcat(rdata, args->argv[i], rdata_len) >= rdata_len) {
			return KNOT_ESPACE;
		}
	}

	return KNOT_EOK;
}

static int set_node_items(cmd_args_t *args, knot_ctl_data_t *data, char *rdata,
                          size_t rdata_len)
{
	int min_args, max_args;
	switch (args->desc->cmd) {
	case CTL_ZONE_READ:
	case CTL_ZONE_GET:   min_args = 1; max_args =  3; break;
	case CTL_ZONE_DIFF:  min_args = 1; max_args =  1; break;
	case CTL_ZONE_SET:   min_args = 3; max_args = -1; break;
	case CTL_ZONE_UNSET: min_args = 2; max_args = -1; break;
	default:
		assert(0);
		return KNOT_EINVAL;
	}

	// Check the number of arguments.
	int ret = check_args(args, min_args, max_args);
	if (ret != KNOT_EOK) {
		return ret;
	}

	int idx = 0;

	// Set ZONE name.
	assert(args->argc > idx);
	if (strcmp(args->argv[idx], "--") != 0) {
		(*data)[KNOT_CTL_IDX_ZONE] = args->argv[idx];
	}
	idx++;

	// Set OWNER name if specified.
	if (args->argc > idx) {
		(*data)[KNOT_CTL_IDX_OWNER] = args->argv[idx];
		idx++;
	}

	// Set TTL only with an editing operation.
	if (args->argc > idx) {
		uint32_t num;
		uint16_t type;
		if (knot_rrtype_from_string(args->argv[idx], &type) != 0 &&
		    str_to_u32(args->argv[idx], &num) == KNOT_EOK) {
			switch (args->desc->cmd) {
			case CTL_ZONE_SET:
			case CTL_ZONE_UNSET:
				(*data)[KNOT_CTL_IDX_TTL] = args->argv[idx];
				idx++;
				break;
			default:
				break;
			}
		}
	}

	// Set record TYPE if specified.
	if (args->argc > idx) {
		(*data)[KNOT_CTL_IDX_TYPE] = args->argv[idx];
		idx++;
	}

	// Set record DATA if specified.
	if (args->argc > idx) {
		ret = set_rdata(args, idx, rdata, rdata_len);
		if (ret != KNOT_EOK) {
			return ret;
		}
		(*data)[KNOT_CTL_IDX_DATA] = rdata;
	}

	return KNOT_EOK;
}

static int cmd_zone_node_ctl(cmd_args_t *args)
{
	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = args->flags,
	};

	char rdata[65536]; // Maximum item size in libknot control interface.

	int ret = set_node_items(args, &data, rdata, sizeof(rdata));
	if (ret != KNOT_EOK) {
		return ret;
	}

	CTL_SEND_DATA
	CTL_SEND_BLOCK

	return ctl_receive(args);
}

static int cmd_conf_init(cmd_args_t *args)
{
	int ret = check_args(args, 0, 0);
	if (ret != KNOT_EOK) {
		return ret;
	}

	ret = conf_db_check(conf(), &conf()->read_txn);
	if ((ret >= KNOT_EOK || ret == KNOT_CONF_EVERSION)) {
		if (ret != KNOT_EOK && !args->force) {
			log_error("use force option to overwrite the existing "
			          "destination and ensure the server is not running!");
			return KNOT_EDENIED;
		}

		ret = conf_import(conf(), "", 0);
	}

	if (ret == KNOT_EOK) {
		log_info("OK");
	} else {
		log_error("init (%s)", knot_strerror(ret));
	}

	return ret;
}

static int conf_check_group(const yp_item_t *group, const uint8_t *id, size_t id_len)
{
	knotd_conf_check_extra_t extra = {
		.conf = conf(),
		.txn = &conf()->read_txn,
		.check = true
	};
	knotd_conf_check_args_t args = {
		.id = id,
		.id_len = id_len,
		.extra = &extra
	};

	bool non_empty = false;
	bool error = false;

	// Check the group sub-items.
	for (yp_item_t *item = group->sub_items; item->name != NULL; item++) {
		args.item = item;

		conf_val_t bin;
		conf_db_get(conf(), &conf()->read_txn, group->name, item->name,
		            id, id_len, &bin);
		if (bin.code == KNOT_ENOENT) {
			continue;
		} else if (bin.code != KNOT_EOK) {
			log_error("failed to read the configuration DB (%s)",
			          knot_strerror(bin.code));
			return bin.code;
		}

		non_empty = true;

		// Check the item value(s).
		size_t values = conf_val_count(&bin);
		for (size_t i = 1; i <= values; i++) {
			conf_val(&bin);
			args.data = bin.data;
			args.data_len = bin.len;

			int ret = conf_exec_callbacks(&args);
			if (ret != KNOT_EOK) {
				log_error("config, item '%s%s%s%s.%s' (%s)",
				          group->name + 1,
				          (id != NULL ? "[" : ""),
				          (id != NULL ? (const char *)id  : ""),
				          (id != NULL ? "]" : ""),
				          item->name + 1,
				          args.err_str);
				error = true;
			}
			if (values > 1) {
				conf_val_next(&bin);
			}
		}
	}

	// Check the group item itself.
	if (id != NULL || non_empty) {
		args.item = group;
		args.data = NULL;
		args.data_len = 0;

		int ret = conf_exec_callbacks(&args);
		if (ret != KNOT_EOK) {
			log_error("config, section '%s%s%s%s' (%s)",
			          group->name + 1,
			          (id != NULL ? "[" : ""),
			          (id != NULL ? (const char *)id  : ""),
			          (id != NULL ? "]" : ""),
			          args.err_str);
			error = true;
		}
	}

	return error ? KNOT_ESEMCHECK : KNOT_EOK;
}

static int cmd_conf_check(cmd_args_t *args) // Similar to conf_io_check().
{
	int ret = check_args(args, 0, 0);
	if (ret != KNOT_EOK) {
		return ret;
	}

	if (conf()->filename == NULL) { // Config file already checked.
		for (yp_item_t *item = conf()->schema; item->name != NULL; item++) {
			// Skip include item.
			if (item->type != YP_TGRP) {
				continue;
			}

			// Group without identifiers.
			if (!(item->flags & YP_FMULTI)) {
				ret = conf_check_group(item, NULL, 0);
				if (ret != KNOT_EOK) {
					return ret;
				}
				continue;
			}

			conf_iter_t iter;
			ret = conf_db_iter_begin(conf(), &conf()->read_txn, item->name, &iter);
			if (ret == KNOT_ENOENT) {
				continue;
			} else if (ret != KNOT_EOK) {
				log_error("failed to read the configuration DB (%s)",
				          knot_strerror(ret));
				return ret;
			}

			while (ret == KNOT_EOK) {
				const uint8_t *id;
				size_t id_len;
				ret = conf_db_iter_id(conf(), &iter, &id, &id_len);
				if (ret != KNOT_EOK) {
					conf_db_iter_finish(conf(), &iter);
					log_error("failed to read the configuration DB (%s)",
					          knot_strerror(ret));
					return ret;
				}

				// Check the group with this identifier.
				ret = conf_check_group(item, id, id_len);
				if (ret != KNOT_EOK) {
					conf_db_iter_finish(conf(), &iter);
					return ret;
				}

				ret = conf_db_iter_next(conf(), &iter);
			}
			if (ret != KNOT_EOF) {
				log_error("failed to read the configuration DB (%s)",
				          knot_strerror(ret));
				return ret;
			}
		}
	}

	log_info("Configuration is valid");

	return KNOT_EOK;
}

static int cmd_conf_import(cmd_args_t *args)
{
	int ret = check_args(args, 1, 2);
	if (ret != KNOT_EOK) {
		return ret;
	}

	import_flag_t flags = IMPORT_FILE;
	if (args->argc == 2) {
		const char *filter = args->argv[1];
		if (strcmp(filter, FILTER_IMPORT_NOPURGE) == 0) {
			flags |= IMPORT_NO_PURGE;
		} else {
			log_error("unknown filter: %s", filter);
			return KNOT_EINVAL;
		}
	}

	ret = conf_db_check(conf(), &conf()->read_txn);
	if ((ret >= KNOT_EOK || ret == KNOT_CONF_EVERSION)) {
		if (ret != KNOT_EOK && !args->force) {
			log_error("use force option to modify/overwrite the existing "
			          "destination and ensure the server is not running!");
			return KNOT_EDENIED;
		}

		// Import to a cloned conf to avoid external module conflict.
		conf_t *new_conf = NULL;
		ret = conf_clone(&new_conf);
		if (ret == KNOT_EOK) {
			yp_schema_purge_dynamic(new_conf->schema);
			log_debug("loading modules for imported configuration");
			ret = conf_mod_load_common(new_conf);
			if (ret == KNOT_EOK) {
				log_debug("importing confdb from file '%s'", args->argv[0]);
				ret = conf_import(new_conf, args->argv[0], flags);
			}
			conf_free(new_conf);
		}
	}

	if (ret == KNOT_EOK) {
		log_info("OK");
	} else {
		log_error("import (%s)", knot_strerror(ret));
	}

	return ret;
}

static int cmd_conf_export(cmd_args_t *args)
{
	int ret = check_args(args, 0, 2);
	if (ret != KNOT_EOK) {
		return ret;
	}

	// Stdout is the default output file.
	const char *file_name = NULL;
	bool export_schema = false;
	for (int i = 0; i < args->argc; i++) {
		if (args->argv[i][0] == '+') {
			if (strcmp(args->argv[i], FILTER_EXPORT_SCHEMA) == 0) {
				export_schema = true;
			} else {
				log_error("unknown filter: %s", args->argv[i]);
				return KNOT_EINVAL;
			}
		} else if (file_name == NULL) {
			file_name = args->argv[i];
		} else {
			log_error("command does not take 2 arguments");
			return KNOT_EINVAL;
		}
	}

	if (file_name != NULL) {
		if (export_schema) {
			log_debug("exporting JSON schema into file '%s'", file_name);
		} else {
			log_debug("exporting confdb into file '%s'", file_name);
		}
	}

	if (export_schema) {
		ret = conf_export_schema(conf(), file_name);
	} else {
		ret = conf_export(conf(), file_name, YP_SNONE);
	}
	if (ret == KNOT_EOK) {
		if (file_name != NULL) {
			log_info("OK");
		}
	} else {
		log_error("export (%s)", knot_strerror(ret));
	}

	return ret;
}

static int cmd_conf_ctl(cmd_args_t *args)
{
	// Check the number of arguments.
	int ret = check_conf_args(args);
	if (ret != KNOT_EOK) {
		return ret;
	}

	char flags[16] = "";
	strlcat(flags, args->flags, sizeof(flags));
	if (args->desc->flags & CMD_FLIST_SCHEMA) {
		strlcat(flags, CTL_FLAG_LIST_SCHEMA, sizeof(flags));
	}

	knot_ctl_data_t data = {
		[KNOT_CTL_IDX_CMD] = ctl_cmd_to_str(args->desc->cmd),
		[KNOT_CTL_IDX_FLAGS] = flags,
	};

	// Send the command without parameters.
	if (args->argc == 0) {
		CTL_SEND_DATA
	// Set the first item argument.
	} else {
		ret = get_conf_key(args->argv[0], &data);
		if (ret != KNOT_EOK) {
			return ret;
		}

		// Send if only one argument or item without values.
		if (args->argc == 1 || !(args->desc->flags & CMD_FOPT_DATA)) {
			CTL_SEND_DATA
		}
	}

	// Send the item values or the other items.
	for (int i = 1; i < args->argc; i++) {
		if (args->desc->flags & CMD_FOPT_DATA) {
			data[KNOT_CTL_IDX_DATA] = args->argv[i];
		} else {
			ret = get_conf_key(args->argv[i], &data);
			if (ret != KNOT_EOK) {
				return ret;
			}
		}

		CTL_SEND_DATA
	}

	CTL_SEND_BLOCK

	return ctl_receive(args);
}

const cmd_desc_t cmd_table[] = {
	{ CMD_EXIT,            NULL,              CTL_NONE },

	{ CMD_STATUS,          cmd_ctl,           CTL_STATUS,          CMD_FOPT_DATA},
	{ CMD_STOP,            cmd_ctl,           CTL_STOP },
	{ CMD_RELOAD,          cmd_ctl,           CTL_RELOAD },
	{ CMD_STATS,           cmd_stats_ctl,     CTL_STATS },

	{ CMD_ZONE_CHECK,      cmd_zone_check,        CTL_NONE,            CMD_FOPT_ZONE | CMD_FREAD },
	{ CMD_ZONE_STATUS,     cmd_zone_filter_ctl,   CTL_ZONE_STATUS,     CMD_FOPT_ZONE },
	{ CMD_ZONE_RELOAD,     cmd_zone_ctl,          CTL_ZONE_RELOAD,     CMD_FOPT_ZONE },
	{ CMD_ZONE_REFRESH,    cmd_zone_ctl,          CTL_ZONE_REFRESH,    CMD_FOPT_ZONE },
	{ CMD_ZONE_RETRANSFER, cmd_zone_ctl,          CTL_ZONE_RETRANSFER, CMD_FOPT_ZONE },
	{ CMD_ZONE_NOTIFY,     cmd_zone_ctl,          CTL_ZONE_NOTIFY,     CMD_FOPT_ZONE },
	{ CMD_ZONE_FLUSH,      cmd_zone_filter_ctl,   CTL_ZONE_FLUSH,      CMD_FOPT_ZONE },
	{ CMD_ZONE_BACKUP,     cmd_zone_filter_ctl,   CTL_ZONE_BACKUP,     CMD_FOPT_ZONE },
	{ CMD_ZONE_RESTORE,    cmd_zone_filter_ctl,   CTL_ZONE_RESTORE,    CMD_FOPT_ZONE },
	{ CMD_ZONE_SIGN,       cmd_zone_ctl,          CTL_ZONE_SIGN,       CMD_FOPT_ZONE },
	{ CMD_ZONE_VALIDATE,   cmd_zone_ctl,          CTL_ZONE_VALIDATE,   CMD_FOPT_ZONE },
	{ CMD_ZONE_KEYS_LOAD,  cmd_zone_ctl,          CTL_ZONE_KEYS_LOAD,  CMD_FOPT_ZONE },
	{ CMD_ZONE_KEY_ROLL,   cmd_zone_key_roll_ctl, CTL_ZONE_KEY_ROLL,   CMD_FREQ_ZONE },
	{ CMD_ZONE_KSK_SBM,    cmd_zone_ctl,          CTL_ZONE_KSK_SBM,    CMD_FREQ_ZONE | CMD_FOPT_ZONE },
	{ CMD_ZONE_FREEZE,     cmd_zone_ctl,          CTL_ZONE_FREEZE,     CMD_FOPT_ZONE },
	{ CMD_ZONE_THAW,       cmd_zone_ctl,          CTL_ZONE_THAW,       CMD_FOPT_ZONE },
	{ CMD_ZONE_XFR_FREEZE, cmd_zone_ctl,          CTL_ZONE_XFR_FREEZE, CMD_FOPT_ZONE },
	{ CMD_ZONE_XFR_THAW,   cmd_zone_ctl,          CTL_ZONE_XFR_THAW,   CMD_FOPT_ZONE },

	{ CMD_ZONE_READ,       cmd_zone_node_ctl,   CTL_ZONE_READ,       CMD_FREQ_ZONE },
	{ CMD_ZONE_BEGIN,      cmd_zone_ctl,        CTL_ZONE_BEGIN,      CMD_FREQ_ZONE | CMD_FOPT_ZONE },
	{ CMD_ZONE_COMMIT,     cmd_zone_ctl,        CTL_ZONE_COMMIT,     CMD_FREQ_ZONE | CMD_FOPT_ZONE },
	{ CMD_ZONE_ABORT,      cmd_zone_ctl,        CTL_ZONE_ABORT,      CMD_FREQ_ZONE | CMD_FOPT_ZONE },
	{ CMD_ZONE_DIFF,       cmd_zone_node_ctl,   CTL_ZONE_DIFF,       CMD_FREQ_ZONE },
	{ CMD_ZONE_GET,        cmd_zone_node_ctl,   CTL_ZONE_GET,        CMD_FREQ_ZONE },
	{ CMD_ZONE_SET,        cmd_zone_node_ctl,   CTL_ZONE_SET,        CMD_FREQ_ZONE },
	{ CMD_ZONE_UNSET,      cmd_zone_node_ctl,   CTL_ZONE_UNSET,      CMD_FREQ_ZONE },
	{ CMD_ZONE_PURGE,      cmd_zone_filter_ctl, CTL_ZONE_PURGE,      CMD_FREQ_ZONE | CMD_FOPT_ZONE },
	{ CMD_ZONE_STATS,      cmd_stats_ctl,       CTL_ZONE_STATS,      CMD_FREQ_ZONE },

	{ CMD_CONF_INIT,       cmd_conf_init,     CTL_NONE,            CMD_FWRITE },
	{ CMD_CONF_CHECK,      cmd_conf_check,    CTL_NONE,            CMD_FREAD  | CMD_FREQ_MOD },
	{ CMD_CONF_IMPORT,     cmd_conf_import,   CTL_NONE,            CMD_FWRITE | CMD_FOPT_MOD },
	{ CMD_CONF_EXPORT,     cmd_conf_export,   CTL_NONE,            CMD_FREAD  | CMD_FOPT_MOD },
	{ CMD_CONF_LIST,       cmd_conf_ctl,      CTL_CONF_LIST,       CMD_FOPT_ITEM | CMD_FLIST_SCHEMA },
	{ CMD_CONF_READ,       cmd_conf_ctl,      CTL_CONF_READ,       CMD_FOPT_ITEM },
	{ CMD_CONF_BEGIN,      cmd_conf_ctl,      CTL_CONF_BEGIN },
	{ CMD_CONF_COMMIT,     cmd_conf_ctl,      CTL_CONF_COMMIT },
	{ CMD_CONF_ABORT,      cmd_conf_ctl,      CTL_CONF_ABORT },
	{ CMD_CONF_DIFF,       cmd_conf_ctl,      CTL_CONF_DIFF,       CMD_FOPT_ITEM | CMD_FREQ_TXN },
	{ CMD_CONF_GET,        cmd_conf_ctl,      CTL_CONF_GET,        CMD_FOPT_ITEM | CMD_FREQ_TXN },
	{ CMD_CONF_SET,        cmd_conf_ctl,      CTL_CONF_SET,        CMD_FREQ_ITEM | CMD_FOPT_DATA | CMD_FREQ_TXN | CMD_FLIST_SCHEMA},
	{ CMD_CONF_UNSET,      cmd_conf_ctl,      CTL_CONF_UNSET,      CMD_FOPT_ITEM | CMD_FOPT_DATA | CMD_FREQ_TXN },
	{ NULL }
};

static const cmd_help_t cmd_help_table[] = {
	{ CMD_EXIT,            "",                                           "Exit interactive mode." },
	{ "",                  "",                                           "" },
	{ CMD_STATUS,          "[<detail>]",                                 "Check if the server is running." },
	{ CMD_STOP,            "",                                           "Stop the server if running." },
	{ CMD_RELOAD,          "",                                           "Reload the server configuration and modified zones." },
	{ CMD_STATS,           "[<module>[.<counter>]]",                     "Show global statistics counter(s)." },
	{ "",                  "",                                           "" },
	{ CMD_ZONE_CHECK,      "[<zone>...]",                                "Check if the zone can be loaded. (*)" },
	{ CMD_ZONE_STATUS,     "[<zone>...] [<filter>...]",                  "Show the zone status." },
	{ CMD_ZONE_RELOAD,     "[<zone>...]",                                "Reload a zone from a disk. (#)" },
	{ CMD_ZONE_REFRESH,    "[<zone>...]",                                "Force slave zone refresh. (#)" },
	{ CMD_ZONE_NOTIFY,     "[<zone>...]",                                "Send a NOTIFY message to all configured remotes. (#)" },
	{ CMD_ZONE_RETRANSFER, "[<zone>...]",                                "Force slave zone retransfer (no serial check). (#)" },
	{ CMD_ZONE_FLUSH,      "[<zone>...] [<filter>...]",                  "Flush zone journal into the zone file. (#)" },
	{ CMD_ZONE_BACKUP,     "[<zone>...] [<filter>...] +backupdir <dir>", "Backup zone data and metadata. (#)" },
	{ CMD_ZONE_RESTORE,    "[<zone>...] [<filter>...] +backupdir <dir>", "Restore zone data and metadata. (#)" },
	{ CMD_ZONE_SIGN,       "[<zone>...]",                                "Re-sign the automatically signed zone. (#)" },
	{ CMD_ZONE_VALIDATE,   "[<zone>...]",                                "Trigger a DNSSEC validation of the zone. (#)" },
	{ CMD_ZONE_KEYS_LOAD,  "[<zone>...]",                                "Re-load keys from KASP database, sign the zone. (#)" },
	{ CMD_ZONE_KEY_ROLL,   " <zone> ksk|zsk",                            "Trigger immediate key rollover. (#)" },
	{ CMD_ZONE_KSK_SBM,    " <zone>...",                                 "When KSK submission, confirm parent's DS presence. (#)" },
	{ CMD_ZONE_FREEZE,     "[<zone>...]",                                "Temporarily postpone automatic zone-changing events. (#)" },
	{ CMD_ZONE_THAW,       "[<zone>...]",                                "Dismiss zone freeze. (#)" },
	{ CMD_ZONE_XFR_FREEZE, "[<zone>...]",                                "Temporarily disable outgoing AXFR/IXFR. (#)" },
	{ CMD_ZONE_XFR_THAW,   "[<zone>...]",                                "Dismiss outgoing XFR freeze. (#)" },
	{ "",                  "",                                           "" },
	{ CMD_ZONE_READ,       "<zone> [<owner> [<type>]]",                  "Get zone data that are currently being presented." },
	{ CMD_ZONE_BEGIN,      "<zone>...",                                  "Begin a zone transaction." },
	{ CMD_ZONE_COMMIT,     "<zone>...",                                  "Commit the zone transaction." },
	{ CMD_ZONE_ABORT,      "<zone>...",                                  "Abort the zone transaction." },
	{ CMD_ZONE_DIFF,       "<zone>",                                     "Get zone changes within the transaction." },
	{ CMD_ZONE_GET,        "<zone> [<owner> [<type>]]",                  "Get zone data within the transaction." },
	{ CMD_ZONE_SET,        "<zone>  <owner> [<ttl>] <type> <rdata>",     "Add zone record within the transaction." },
	{ CMD_ZONE_UNSET,      "<zone>  <owner> [<type> [<rdata>]]",         "Remove zone data within the transaction." },
	{ CMD_ZONE_PURGE,      "<zone>... [<filter>...]",                    "Purge zone data, zone file, journal, timers, and KASP data. (#)" },
	{ CMD_ZONE_STATS,      "<zone> [<module>[.<counter>]]",              "Show zone statistics counter(s)."},
	{ "",                  "",                                           "" },
	{ CMD_CONF_INIT,       "",                                           "Initialize the confdb. (*)" },
	{ CMD_CONF_CHECK,      "",                                           "Check the server configuration. (*)" },
	{ CMD_CONF_IMPORT,     " <filename> [+nopurge]",                     "Import a config file into the confdb. (*)" },
	{ CMD_CONF_EXPORT,     "[<filename>] [+schema]",                     "Export the confdb (or JSON schema) into a file or stdout. (*)" },
	{ CMD_CONF_LIST,       "[<item>...]",                                "List the confdb sections or section items." },
	{ CMD_CONF_READ,       "[<item>...]",                                "Get the item from the active confdb." },
	{ CMD_CONF_BEGIN,      "",                                           "Begin a writing confdb transaction." },
	{ CMD_CONF_COMMIT,     "",                                           "Commit the confdb transaction." },
	{ CMD_CONF_ABORT,      "",                                           "Rollback the confdb transaction." },
	{ CMD_CONF_DIFF,       "[<item>...]",                                "Get the item difference within the transaction." },
	{ CMD_CONF_GET,        "[<item>...]",                                "Get the item data within the transaction." },
	{ CMD_CONF_SET,        " <item>  [<data>...]",                       "Set the item data within the transaction." },
	{ CMD_CONF_UNSET,      "[<item>] [<data>...]",                       "Unset the item data within the transaction." },
	{ NULL }
};

void print_commands(void)
{
	printf("\nActions:\n");

	for (const cmd_help_t *cmd = cmd_help_table; cmd->name != NULL; cmd++) {
		printf(" %-18s %-38s %s\n", cmd->name, cmd->params, cmd->desc);
	}

	printf("\n"
	       "Note:\n"
	       " Use @ owner to denote the zone name.\n"
	       " Empty or '--' <zone> parameter means all zones or all zones with a transaction.\n"
	       " Type <item> parameter in the form of <section>[<identifier>].<name>.\n"
	       " (*) indicates a local operation which requires a configuration.\n"
	       " (#) indicates an optionally blocking operation.\n"
	       " The '-b' and '-f' options can be placed right after the command name.\n");
}