summaryrefslogtreecommitdiffstats
path: root/usr.sbin/dhcpd/confpars.c
blob: 1bdffb38842fe513a0c0d091a0dbd65a5f96d461 (plain) (blame)
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
/*	$OpenBSD: confpars.c,v 1.36 2020/04/23 15:00:27 krw Exp $ */

/*
 * Copyright (c) 1995, 1996, 1997 The Internet Software Consortium.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of The Internet Software Consortium nor the names
 *    of its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This software has been written for the Internet Software Consortium
 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
 * Enterprises.  To learn more about the Internet Software Consortium,
 * see ``http://www.vix.com/isc''.  To learn more about Vixie
 * Enterprises, see ``http://www.vix.com''.
 */

#include <sys/types.h>
#include <sys/socket.h>

#include <net/if.h>

#include <limits.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "dhcp.h"
#include "tree.h"
#include "dhcpd.h"
#include "dhctoken.h"
#include "log.h"

int	parse_cidr(FILE *, unsigned char *, unsigned char *);

/*
 * conf-file :== parameters declarations EOF
 * parameters :== <nil> | parameter | parameters parameter
 * declarations :== <nil> | declaration | declarations declaration
 */
int
readconf(void)
{
	FILE *cfile;
	char *val;
	int token;
	int declaration = 0;

	new_parse(path_dhcpd_conf);

	/* Set up the initial dhcp option universe. */
	initialize_universes();

	/* Set up the global defaults. */
	root_group.default_lease_time = 43200; /* 12 hours. */
	root_group.max_lease_time = 86400; /* 24 hours. */
	root_group.bootp_lease_cutoff = MAX_TIME;
	root_group.boot_unknown_clients = 1;
	root_group.allow_bootp = 1;
	root_group.allow_booting = 1;
	root_group.authoritative = 1;
	root_group.echo_client_id = 1;

	if ((cfile = fopen(path_dhcpd_conf, "r")) == NULL)
		fatal("Can't open %s", path_dhcpd_conf);

	do {
		token = peek_token(&val, cfile);
		if (token == EOF)
			break;
		declaration = parse_statement(cfile, &root_group,
						 ROOT_GROUP,
						 NULL,
						 declaration);
	} while (1);
	token = next_token(&val, cfile); /* Clear the peek buffer */
	fclose(cfile);

	return !warnings_occurred;
}

/*
 * lease-file :== lease-declarations EOF
 * lease-statments :== <nil>
 *		   | lease-declaration
 *		   | lease-declarations lease-declaration
 */
void
read_leases(void)
{
	FILE *cfile;
	char *val;
	int token;

	new_parse(path_dhcpd_db);

	/*
	 * Open the lease file.   If we can't open it, fail.   The reason
	 * for this is that although on initial startup, the absence of
	 * a lease file is perfectly benign, if dhcpd has been running
	 * and this file is absent, it means that dhcpd tried and failed
	 * to rewrite the lease database.   If we proceed and the
	 * problem which caused the rewrite to fail has been fixed, but no
	 * human has corrected the database problem, then we are left
	 * thinking that no leases have been assigned to anybody, which
	 * could create severe network chaos.
	 */
	if ((cfile = fopen(path_dhcpd_db, "r")) == NULL) {
		log_warn("Can't open lease database (%s)", path_dhcpd_db);
		log_warnx("check for failed database rewrite attempt!");
		log_warnx("Please read the dhcpd.leases manual page if you");
		fatalx("don't know what to do about this.");
	}

	do {
		token = next_token(&val, cfile);
		if (token == EOF)
			break;
		if (token != TOK_LEASE) {
			log_warnx("Corrupt lease file - possible data loss!");
			skip_to_semi(cfile);
		} else {
			struct lease *lease;
			lease = parse_lease_declaration(cfile);
			if (lease)
				enter_lease(lease);
			else
				parse_warn("possibly corrupt lease file");
		}

	} while (1);
	fclose(cfile);
}

/*
 * statement :== parameter | declaration
 *
 * parameter :== timestamp
 *	     | DEFAULT_LEASE_TIME lease_time
 *	     | MAX_LEASE_TIME lease_time
 *	     | DYNAMIC_BOOTP_LEASE_CUTOFF date
 *	     | DYNAMIC_BOOTP_LEASE_LENGTH lease_time
 *	     | BOOT_UNKNOWN_CLIENTS boolean
 *	     | GET_LEASE_HOSTNAMES boolean
 *	     | USE_HOST_DECL_NAME boolean
 *	     | NEXT_SERVER ip-addr-or-hostname SEMI
 *	     | option_parameter
 *	     | SERVER-IDENTIFIER ip-addr-or-hostname SEMI
 *	     | FILENAME string-parameter
 *	     | SERVER_NAME string-parameter
 *	     | hardware-parameter
 *	     | fixed-address-parameter
 *	     | ALLOW allow-deny-keyword
 *	     | DENY allow-deny-keyword
 *	     | USE_LEASE_ADDR_FOR_DEFAULT_ROUTE boolean
 *
 * declaration :== host-declaration
 *		 | group-declaration
 *		 | shared-network-declaration
 *		 | subnet-declaration
 *		 | VENDOR_CLASS class-declaration
 *		 | USER_CLASS class-declaration
 *		 | RANGE address-range-declaration
 */
int
parse_statement(FILE *cfile, struct group *group, int type,
	struct host_decl *host_decl, int declaration)
{
	int token;
	char *val;
	struct shared_network *share;
	char *n;
	struct tree *tree;
	struct tree_cache *cache;
	struct hardware hardware;

	switch (next_token(&val, cfile)) {
	case TOK_HOST:
		if (type != HOST_DECL)
			parse_host_declaration(cfile, group);
		else {
			parse_warn("host declarations not allowed here.");
			skip_to_semi(cfile);
		}
		return 1;

	case TOK_GROUP:
		if (type != HOST_DECL)
			parse_group_declaration(cfile, group);
		else {
			parse_warn("host declarations not allowed here.");
			skip_to_semi(cfile);
		}
		return 1;

	case TOK_TIMESTAMP:
		break;

	case TOK_SHARED_NETWORK:
		if (type == SHARED_NET_DECL ||
		    type == HOST_DECL ||
		    type == SUBNET_DECL) {
			parse_warn("shared-network parameters not %s.",
				    "allowed here");
			skip_to_semi(cfile);
			break;
		}

		parse_shared_net_declaration(cfile, group);
		return 1;

	case TOK_SUBNET:
		if (type == HOST_DECL || type == SUBNET_DECL) {
			parse_warn("subnet declarations not allowed here.");
			skip_to_semi(cfile);
			return 1;
		}

		/* If we're in a subnet declaration, just do the parse. */
		if (group->shared_network) {
			parse_subnet_declaration(cfile,
			    group->shared_network);
			break;
		}

		/*
		 * Otherwise, cons up a fake shared network structure
		 * and populate it with the lone subnet.
		 */

		share = calloc(1, sizeof(struct shared_network));
		if (!share)
			fatalx("No memory for shared subnet");
		share->group = clone_group(group, "parse_statement:subnet");
		share->group->shared_network = share;

		parse_subnet_declaration(cfile, share);

		/* share->subnets is the subnet we just parsed. */
		if (share->subnets) {
			share->interface =
				share->subnets->interface;

			/* Make the shared network name from network number. */
			n = piaddr(share->subnets->net);
			share->name = strdup(n);
			if (share->name == NULL)
				fatalx("no memory for subnet name");

			/*
			 * Copy the authoritative parameter from the subnet,
			 * since there is no opportunity to declare it here.
			 */
			share->group->authoritative =
				share->subnets->group->authoritative;
			enter_shared_network(share);
		}
		return 1;

	case TOK_VENDOR_CLASS:
		parse_class_declaration(cfile, group, 0);
		return 1;

	case TOK_USER_CLASS:
		parse_class_declaration(cfile, group, 1);
		return 1;

	case TOK_DEFAULT_LEASE_TIME:
		parse_lease_time(cfile, &group->default_lease_time);
		break;

	case TOK_MAX_LEASE_TIME:
		parse_lease_time(cfile, &group->max_lease_time);
		break;

	case TOK_DYNAMIC_BOOTP_LEASE_CUTOFF:
		group->bootp_lease_cutoff = parse_date(cfile);
		break;

	case TOK_DYNAMIC_BOOTP_LEASE_LENGTH:
		parse_lease_time(cfile, &group->bootp_lease_length);
		break;

	case TOK_BOOT_UNKNOWN_CLIENTS:
		if (type == HOST_DECL)
			parse_warn("boot-unknown-clients not allowed here.");
		group->boot_unknown_clients = parse_boolean(cfile);
		break;

	case TOK_GET_LEASE_HOSTNAMES:
		if (type == HOST_DECL)
			parse_warn("get-lease-hostnames not allowed here.");
		group->get_lease_hostnames = parse_boolean(cfile);
		break;

	case TOK_ALWAYS_REPLY_RFC1048:
		group->always_reply_rfc1048 = parse_boolean(cfile);
		break;

	case TOK_ECHO_CLIENT_ID:
		group->echo_client_id = parse_boolean(cfile);
		break;

	case TOK_USE_HOST_DECL_NAMES:
		if (type == HOST_DECL)
			parse_warn("use-host-decl-names not allowed here.");
		group->use_host_decl_names = parse_boolean(cfile);
		break;

	case TOK_USE_LEASE_ADDR_FOR_DEFAULT_ROUTE:
		group->use_lease_addr_for_default_route =
			parse_boolean(cfile);
		break;

	case TOK_TOKEN_NOT:
		token = next_token(&val, cfile);
		switch (token) {
		case TOK_AUTHORITATIVE:
			if (type == HOST_DECL)
			    parse_warn("authority makes no sense here.");
			group->authoritative = 0;
			parse_semi(cfile);
			break;
		default:
			parse_warn("expecting assertion");
			skip_to_semi(cfile);
			break;
		}
		break;

	case TOK_AUTHORITATIVE:
		if (type == HOST_DECL)
		    parse_warn("authority makes no sense here.");
		group->authoritative = 1;
		parse_semi(cfile);
		break;

	case TOK_NEXT_SERVER:
		tree = parse_ip_addr_or_hostname(cfile, 0);
		if (!tree)
			break;
		cache = tree_cache(tree);
		if (!tree_evaluate (cache))
			fatalx("next-server is not known");
		group->next_server.len = 4;
		memcpy(group->next_server.iabuf,
		    cache->value, group->next_server.len);
		parse_semi(cfile);
		break;

	case TOK_OPTION:
		parse_option_param(cfile, group);
		break;

	case TOK_SERVER_IDENTIFIER:
		tree = parse_ip_addr_or_hostname(cfile, 0);
		if (!tree)
			return declaration;
		group->options[DHO_DHCP_SERVER_IDENTIFIER] = tree_cache(tree);
		token = next_token(&val, cfile);
		break;

	case TOK_FILENAME:
		group->filename = parse_string(cfile);
		break;

	case TOK_SERVER_NAME:
		group->server_name = parse_string(cfile);
		break;

	case TOK_HARDWARE:
		parse_hardware_param(cfile, &hardware);
		if (host_decl)
			host_decl->interface = hardware;
		else
			parse_warn("hardware address parameter %s",
				    "not allowed here.");
		break;

	case TOK_FIXED_ADDR:
		cache = parse_fixed_addr_param(cfile);
		if (host_decl)
			host_decl->fixed_addr = cache;
		else
			parse_warn("fixed-address parameter not %s",
				    "allowed here.");
		break;

	case TOK_RANGE:
		if (type != SUBNET_DECL || !group->subnet) {
			parse_warn("range declaration not allowed here.");
			skip_to_semi(cfile);
			return declaration;
		}
		parse_address_range(cfile, group->subnet);
		return declaration;

	case TOK_ALLOW:
		parse_allow_deny(cfile, group, 1);
		break;

	case TOK_DENY:
		parse_allow_deny(cfile, group, 0);
		break;

	default:
		if (declaration)
			parse_warn("expecting a declaration.");
		else
			parse_warn("expecting a parameter or declaration.");
		skip_to_semi(cfile);
		return declaration;
	}

	if (declaration) {
		parse_warn("parameters not allowed after first declaration.");
		return 1;
	}

	return 0;
}

/*
 * allow-deny-keyword :== BOOTP
 *			| BOOTING
 *			| DYNAMIC_BOOTP
 *			| UNKNOWN_CLIENTS
 */
void
parse_allow_deny(FILE *cfile, struct group *group, int flag)
{
	int token;
	char *val;

	token = next_token(&val, cfile);
	switch (token) {
	case TOK_BOOTP:
		group->allow_bootp = flag;
		break;

	case TOK_BOOTING:
		group->allow_booting = flag;
		break;

	case TOK_DYNAMIC_BOOTP:
		group->dynamic_bootp = flag;
		break;

	case TOK_UNKNOWN_CLIENTS:
		group->boot_unknown_clients = flag;
		break;

	default:
		parse_warn("expecting allow/deny key");
		skip_to_semi(cfile);
		return;
	}
	parse_semi(cfile);
}

/*
 * boolean :== ON SEMI | OFF SEMI | TRUE SEMI | FALSE SEMI
 */
int
parse_boolean(FILE *cfile)
{
	char *val;
	int rv;

	next_token(&val, cfile);
	if (!strcasecmp (val, "true") || !strcasecmp (val, "on"))
		rv = 1;
	else if (!strcasecmp (val, "false") || !strcasecmp (val, "off"))
		rv = 0;
	else {
		parse_warn("boolean value (true/false/on/off) expected");
		skip_to_semi(cfile);
		return 0;
	}
	parse_semi(cfile);
	return rv;
}

/*
 * Expect a left brace; if there isn't one, skip over the rest of the
 * statement and return zero; otherwise, return 1.
 */
int
parse_lbrace(FILE *cfile)
{
	int token;
	char *val;

	token = next_token(&val, cfile);
	if (token != '{') {
		parse_warn("expecting left brace.");
		skip_to_semi(cfile);
		return 0;
	}
	return 1;
}


/*
 * host-declaration :== hostname '{' parameters declarations '}'
 */
void
parse_host_declaration(FILE *cfile, struct group *group)
{
	char *val;
	int token;
	struct host_decl *host;
	char *name = parse_host_name(cfile);
	int declaration = 0;

	if (!name)
		return;

	host = calloc(1, sizeof (struct host_decl));
	if (!host)
		fatalx("can't allocate host decl struct %s.", name);

	host->name = name;
	host->group = clone_group(group, "parse_host_declaration");

	if (!parse_lbrace(cfile)) {
		free(host->name);
		free(host->group);
		free(host);
		return;
	}

	do {
		token = peek_token(&val, cfile);
		if (token == '}') {
			token = next_token(&val, cfile);
			break;
		}
		if (token == EOF) {
			token = next_token(&val, cfile);
			parse_warn("unexpected end of file");
			break;
		}
		declaration = parse_statement(cfile, host->group,
		    HOST_DECL, host, declaration);
	} while (1);

	if (!host->group->options[DHO_HOST_NAME] &&
	    host->group->use_host_decl_names) {
		host->group->options[DHO_HOST_NAME] =
		    new_tree_cache("parse_host_declaration");
		if (!host->group->options[DHO_HOST_NAME])
			fatalx("can't allocate a tree cache for hostname.");
		host->group->options[DHO_HOST_NAME]->len =
			strlen(name);
		host->group->options[DHO_HOST_NAME]->value =
			(unsigned char *)name;
		host->group->options[DHO_HOST_NAME]->buf_size =
			host->group->options[DHO_HOST_NAME]->len;
		host->group->options[DHO_HOST_NAME]->timeout = -1;
		host->group->options[DHO_HOST_NAME]->tree =
			NULL;
	}

	enter_host(host);
}

/*
 * class-declaration :== STRING '{' parameters declarations '}'
 */
void
parse_class_declaration(FILE *cfile, struct group *group, int type)
{
	char *val;
	int token;
	struct class *class;
	int declaration = 0;

	token = next_token(&val, cfile);
	if (token != TOK_STRING) {
		parse_warn("Expecting class name");
		skip_to_semi(cfile);
		return;
	}

	class = add_class (type, val);
	if (!class)
		fatalx("No memory for class %s.", val);
	class->group = clone_group(group, "parse_class_declaration");

	if (!parse_lbrace(cfile)) {
		free(class->name);
		free(class->group);
		free(class);
		return;
	}

	do {
		token = peek_token(&val, cfile);
		if (token == '}') {
			token = next_token(&val, cfile);
			break;
		} else if (token == EOF) {
			token = next_token(&val, cfile);
			parse_warn("unexpected end of file");
			break;
		} else {
			declaration = parse_statement(cfile, class->group,
			    CLASS_DECL, NULL, declaration);
		}
	} while (1);
}

/*
 * shared-network-declaration :==
 *			hostname LBRACE declarations parameters RBRACE
 */
void
parse_shared_net_declaration(FILE *cfile, struct group *group)
{
	char *val;
	int token;
	struct shared_network *share;
	char *name;
	int declaration = 0;

	share = calloc(1, sizeof(struct shared_network));
	if (!share)
		fatalx("No memory for shared subnet");
	share->leases = NULL;
	share->last_lease = NULL;
	share->insertion_point = NULL;
	share->next = NULL;
	share->interface = NULL;
	share->group = clone_group(group, "parse_shared_net_declaration");
	share->group->shared_network = share;

	/* Get the name of the shared network. */
	token = peek_token(&val, cfile);
	if (token == TOK_STRING) {
		token = next_token(&val, cfile);

		if (val[0] == 0) {
			parse_warn("zero-length shared network name");
			val = "<no-name-given>";
		}
		name = strdup(val);
		if (name == NULL)
			fatalx("no memory for shared network name");
	} else {
		name = parse_host_name(cfile);
		if (!name) {
			free(share->group);
			free(share);
			return;
		}
	}
	share->name = name;

	if (!parse_lbrace(cfile)) {
		free(share->group);
		free(share->name);
		free(share);
		return;
	}

	do {
		token = peek_token(&val, cfile);
		if (token == '}') {
			token = next_token(&val, cfile);
			if (!share->subnets) {
				free(share->group);
				free(share->name);
				free(share);
				parse_warn("empty shared-network decl");
				return;
			}
			enter_shared_network(share);
			return;
		} else if (token == EOF) {
			token = next_token(&val, cfile);
			parse_warn("unexpected end of file");
			break;
		}

		declaration = parse_statement(cfile, share->group,
		    SHARED_NET_DECL, NULL, declaration);
	} while (1);
}

/*
 * subnet-declaration :==
 *	net NETMASK netmask RBRACE parameters declarations LBRACE
 */
void
parse_subnet_declaration(FILE *cfile, struct shared_network *share)
{
	char *val;
	int token;
	struct subnet *subnet, *t, *u;
	struct iaddr iaddr;
	unsigned char addr[4];
	int len = sizeof addr;
	int declaration = 0;

	subnet = calloc(1, sizeof(struct subnet));
	if (!subnet)
		fatalx("No memory for new subnet");
	subnet->shared_network = share;
	subnet->group = clone_group(share->group, "parse_subnet_declaration");
	subnet->group->subnet = subnet;

	/* Get the network number. */
	if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8)) {
		free(subnet->group);
		free(subnet);
		return;
	}
	memcpy(iaddr.iabuf, addr, len);
	iaddr.len = len;
	subnet->net = iaddr;

	token = next_token(&val, cfile);
	if (token != TOK_NETMASK) {
		free(subnet->group);
		free(subnet);
		parse_warn("Expecting netmask");
		skip_to_semi(cfile);
		return;
	}

	/* Get the netmask. */
	if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8)) {
		free(subnet->group);
		free(subnet);
		return;
	}
	memcpy(iaddr.iabuf, addr, len);
	iaddr.len = len;
	subnet->netmask = iaddr;

	/* Save only the subnet number. */
	subnet->net = subnet_number(subnet->net, subnet->netmask);

	enter_subnet(subnet);

	if (!parse_lbrace(cfile))
		return;

	do {
		token = peek_token(&val, cfile);
		if (token == '}') {
			token = next_token(&val, cfile);
			break;
		} else if (token == EOF) {
			token = next_token(&val, cfile);
			parse_warn("unexpected end of file");
			break;
		}
		declaration = parse_statement(cfile, subnet->group,
		    SUBNET_DECL, NULL, declaration);
	} while (1);

	/*
	 * If this subnet supports dynamic bootp, flag it so in the
	 * shared_network containing it.
	 */
	if (subnet->group->dynamic_bootp)
		share->group->dynamic_bootp = 1;

	/* Add the subnet to the list of subnets in this shared net. */
	if (!share->subnets)
		share->subnets = subnet;
	else {
		u = NULL;
		for (t = share->subnets; t; t = t->next_sibling) {
			if (subnet_inner_than(subnet, t, 0)) {
				if (u)
					u->next_sibling = subnet;
				else
					share->subnets = subnet;
				subnet->next_sibling = t;
				return;
			}
			u = t;
		}
		u->next_sibling = subnet;
	}
}

/*
 * group-declaration :== RBRACE parameters declarations LBRACE
 */
void
parse_group_declaration(FILE *cfile, struct group *group)
{
	char *val;
	int token;
	struct group *g;
	int declaration = 0;

	g = clone_group(group, "parse_group_declaration");

	if (!parse_lbrace(cfile)) {
		free(g);
		return;
	}

	do {
		token = peek_token(&val, cfile);
		if (token == '}') {
			token = next_token(&val, cfile);
			break;
		} else if (token == EOF) {
			token = next_token(&val, cfile);
			parse_warn("unexpected end of file");
			break;
		}
		declaration = parse_statement(cfile, g, GROUP_DECL, NULL,
		    declaration);
	} while (1);
}

/*
 * cidr :== ip-address "/" bit-count
 * ip-address :== NUMBER [ DOT NUMBER [ DOT NUMBER [ DOT NUMBER ] ] ]
 * bit-count :== 0..32
 */
int
parse_cidr(FILE *cfile, unsigned char *subnet, unsigned char *subnetlen)
{
	uint8_t		 cidr[5];
	const char	*errstr;
	char		*val;
	long long	 numval;
	unsigned int	 i;
	int		 token;

	memset(cidr, 0, sizeof(cidr));
	i = 1;	/* Last four octets hold subnet, first octet the # of bits. */
	do {
		token = next_token(&val, cfile);
		if (i == 0)
			numval = strtonum(val, 0, 32, &errstr);
		else
			numval = strtonum(val, 0, UINT8_MAX, &errstr);
		if (errstr != NULL)
			break;
		cidr[i++] = numval;
		if (i == 1) {
			memcpy(subnet, &cidr[1], 4); /* XXX Need cidr_t */
			*subnetlen = cidr[0];
			return 1;
		}
		token = next_token(NULL, cfile);
		if (token == '/')
			i = 0;
		if (i == sizeof(cidr))
			break;
	} while (token == '.' || token == '/');

	parse_warn("expecting IPv4 CIDR block.");

	if (token != ';')
		skip_to_semi(cfile);
	return 0;
}

/*
 * ip-addr-or-hostname :== ip-address | hostname
 * ip-address :== NUMBER DOT NUMBER DOT NUMBER DOT NUMBER
 *
 * Parse an ip address or a hostname.   If uniform is zero, put in
 * a TREE_LIMIT node to catch hostnames that evaluate to more than
 * one IP address.
 */
struct tree *
parse_ip_addr_or_hostname(FILE *cfile, int uniform)
{
	char *val;
	int token;
	unsigned char addr[4];
	int len = sizeof addr;
	char *name;
	struct tree *rv;
	struct hostent *h;

	name = NULL;
	h = NULL;

	token = peek_token(&val, cfile);
	if (is_identifier(token)) {
		name = parse_host_name(cfile);
		if (name)
			h = gethostbyname(name);
		if (name && h) {
			rv = tree_const(h->h_addr_list[0], h->h_length);
			if (!uniform)
				rv = tree_limit(rv, 4);
			return rv;
		}
	}

	if (token == TOK_NUMBER_OR_NAME) {
		if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8)) {
			parse_warn("%s (%d): expecting IP address or hostname",
				    val, token);
			return NULL;
		}
		rv = tree_const(addr, len);
	} else {
		if (token != '{' && token != '}')
			token = next_token(&val, cfile);
		parse_warn("%s (%d): expecting IP address or hostname",
			    val, token);
		if (token != ';')
			skip_to_semi(cfile);
		return NULL;
	}

	return rv;
}


/*
 * fixed-addr-parameter :== ip-addrs-or-hostnames SEMI
 * ip-addrs-or-hostnames :== ip-addr-or-hostname
 *			   | ip-addrs-or-hostnames ip-addr-or-hostname
 */
struct tree_cache *
parse_fixed_addr_param(FILE *cfile)
{
	char *val;
	int token;
	struct tree *tree = NULL;
	struct tree *tmp;

	do {
		tmp = parse_ip_addr_or_hostname(cfile, 0);
		if (tree)
			tree = tree_concat(tree, tmp);
		else
			tree = tmp;
		token = peek_token(&val, cfile);
		if (token == ',')
			token = next_token(&val, cfile);
	} while (token == ',');

	if (!parse_semi(cfile))
		return NULL;
	return tree_cache(tree);
}

/*
 * option_parameter :== identifier DOT identifier <syntax> SEMI
 *		      | identifier <syntax> SEMI
 *
 * Option syntax is handled specially through format strings, so it
 * would be painful to come up with BNF for it. However, it always
 * starts as above and ends in a SEMI.
 */
void
parse_option_param(FILE *cfile, struct group *group)
{
	char *val;
	int token;
	unsigned char buf[4];
	unsigned char cprefix;
	char *vendor;
	char *fmt;
	struct universe *universe;
	struct option *option;
	struct tree *tree = NULL;
	struct tree *t;

	token = next_token(&val, cfile);
	if (!is_identifier(token)) {
		parse_warn("expecting identifier after option keyword.");
		if (token != ';')
			skip_to_semi(cfile);
		return;
	}
	vendor = strdup(val);
	if (vendor == NULL)
		fatalx("no memory for vendor token.");
	token = peek_token(&val, cfile);
	if (token == '.') {
		/* Go ahead and take the DOT token. */
		token = next_token(&val, cfile);

		/* The next token should be an identifier. */
		token = next_token(&val, cfile);
		if (!is_identifier(token)) {
			parse_warn("expecting identifier after '.'");
			if (token != ';')
				skip_to_semi(cfile);
			free(vendor);
			return;
		}

		/*
		 * Look up the option name hash table for the specified
		 * vendor.
		 */
		universe = ((struct universe *)hash_lookup(&universe_hash,
		    (unsigned char *)vendor, 0));
		/*
		 * If it's not there, we can't parse the rest of the
		 * declaration.
		 */
		if (!universe) {
			parse_warn("no vendor named %s.", vendor);
			skip_to_semi(cfile);
			free(vendor);
			return;
		}
	} else {
		/*
		 * Use the default hash table, which contains all the
		 * standard dhcp option names.
		 */
		val = vendor;
		universe = &dhcp_universe;
	}

	/* Look up the actual option info. */
	option = (struct option *)hash_lookup(universe->hash,
	    (unsigned char *)val, 0);

	/* If we didn't get an option structure, it's an undefined option. */
	if (!option) {
		if (val == vendor)
			parse_warn("no option named %s", val);
		else
			parse_warn("no option named %s for vendor %s",
				    val, vendor);
		skip_to_semi(cfile);
		free(vendor);
		return;
	}

	/* Free the initial identifier token. */
	free(vendor);

	/* Parse the option data. */
	do {
		/*
		 * Set a flag if this is an array of a simple type (i.e.,
		 * not an array of pairs of IP addresses, or something
		 * like that.
		 */
		int uniform = option->format[1] == 'A';

		for (fmt = option->format; *fmt; fmt++) {
			if (*fmt == 'A')
				break;
			switch (*fmt) {
			case 'X':
				token = peek_token(&val, cfile);
				if (token == TOK_NUMBER_OR_NAME) {
					do {
						token = next_token
							(&val, cfile);
						if (token !=
						    TOK_NUMBER_OR_NAME) {
							parse_warn("expecting "
							    "hex number.");
							if (token != ';')
								skip_to_semi(
								    cfile);
							return;
						}
						convert_num(buf, val, 16, 8);
						tree = tree_concat(tree,
						    tree_const(buf, 1));
						token = peek_token(&val,
						    cfile);
						if (token == ':')
							token =
							    next_token(&val,
							    cfile);
					} while (token == ':');
				} else if (token == TOK_STRING) {
					token = next_token(&val, cfile);
					tree = tree_concat(tree,
					    tree_const((unsigned char *)val,
					    strlen(val)));
				} else {
					parse_warn("expecting string %s.",
					    "or hexadecimal data");
					skip_to_semi(cfile);
					return;
				}
				break;

			case 't': /* Text string. */
				token = next_token(&val, cfile);
				if (token != TOK_STRING
				    && !is_identifier(token)) {
					parse_warn("expecting string.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				tree = tree_concat(tree,
				    tree_const((unsigned char *)val,
				    strlen(val)));
				break;

			case 'I': /* IP address or hostname. */
				t = parse_ip_addr_or_hostname(cfile, uniform);
				if (!t)
					return;
				tree = tree_concat(tree, t);
				break;

			case 'L': /* Unsigned 32-bit integer. */
			case 'l': /* Signed 32-bit integer. */
				token = next_token(&val, cfile);
				if (token != TOK_NUMBER && token !=
				    TOK_NUMBER_OR_NAME) {
					parse_warn("expecting number.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				convert_num(buf, val, 0, 32);
				tree = tree_concat(tree, tree_const(buf, 4));
				break;
			case 's': /* Signed 16-bit integer. */
			case 'S': /* Unsigned 16-bit integer. */
				token = next_token(&val, cfile);
				if (token != TOK_NUMBER && token !=
				    TOK_NUMBER_OR_NAME) {
					parse_warn("expecting number.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				convert_num(buf, val, 0, 16);
				tree = tree_concat(tree, tree_const(buf, 2));
				break;
			case 'b': /* Signed 8-bit integer. */
			case 'B': /* Unsigned 8-bit integer. */
				token = next_token(&val, cfile);
				if (token != TOK_NUMBER && token !=
				    TOK_NUMBER_OR_NAME) {
					parse_warn("expecting number.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				convert_num(buf, val, 0, 8);
				tree = tree_concat(tree, tree_const(buf, 1));
				break;
			case 'f': /* Boolean flag. */
				token = next_token(&val, cfile);
				if (!is_identifier(token)) {
					parse_warn("expecting identifier.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				if (!strcasecmp(val, "true")
				    || !strcasecmp(val, "on"))
					buf[0] = 1;
				else if (!strcasecmp(val, "false")
					 || !strcasecmp(val, "off"))
					buf[0] = 0;
				else {
					parse_warn("expecting boolean.");
					if (token != ';')
						skip_to_semi(cfile);
					return;
				}
				tree = tree_concat(tree, tree_const(buf, 1));
				break;
			case 'C':
				if (!parse_cidr(cfile, buf, &cprefix))
					return;
				tree = tree_concat(tree, tree_const(&cprefix,
				    sizeof(cprefix)));
				if (cprefix > 0)
					tree = tree_concat(tree, tree_const(
					    buf, (cprefix + 7) / 8));
				break;
			case 'D':
				t = parse_domain_and_comp(cfile);
				if (!t)
					return;
				tree = tree_concat(tree, t);
				break;
			default:
				log_warnx("Bad format %c in "
				    "parse_option_param.", *fmt);
				skip_to_semi(cfile);
				return;
			}
		}
		if (*fmt == 'A') {
			token = peek_token(&val, cfile);
			if (token == ',') {
				token = next_token(&val, cfile);
				continue;
			}
			break;
		}
	} while (*fmt == 'A');

	token = next_token(&val, cfile);
	if (token != ';') {
		parse_warn("semicolon expected.");
		skip_to_semi(cfile);
		return;
	}
	group->options[option->code] = tree_cache(tree);
}

/*
 * lease_declaration :== LEASE ip_address LBRACE lease_parameters RBRACE
 *
 * lease_parameters :== <nil>
 *		      | lease_parameter
 *		      | lease_parameters lease_parameter
 *
 * lease_parameter :== STARTS date
 *		     | ENDS date
 *		     | TIMESTAMP date
 *		     | HARDWARE hardware-parameter
 *		     | UID hex_numbers SEMI
 *		     | HOSTNAME hostname SEMI
 *		     | CLIENT_HOSTNAME hostname SEMI
 *		     | CLASS identifier SEMI
 *		     | DYNAMIC_BOOTP SEMI
 */
struct lease *
parse_lease_declaration(FILE *cfile)
{
	char *val;
	int token;
	unsigned char addr[4];
	int len = sizeof addr;
	int seenmask = 0;
	int seenbit;
	char tbuf[32];
	static struct lease lease;

	/* Zap the lease structure. */
	memset(&lease, 0, sizeof lease);

	/* Get the address for which the lease has been issued. */
	if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8))
		return NULL;
	memcpy(lease.ip_addr.iabuf, addr, len);
	lease.ip_addr.len = len;

	if (!parse_lbrace(cfile))
		return NULL;

	do {
		token = next_token(&val, cfile);
		if (token == '}')
			break;
		else if (token == EOF) {
			parse_warn("unexpected end of file");
			break;
		}
		strlcpy(tbuf, val, sizeof tbuf);

		/* Parse any of the times associated with the lease. */
		if (token == TOK_STARTS || token == TOK_ENDS || token ==
		    TOK_TIMESTAMP) {
			time_t t;
			t = parse_date(cfile);
			switch (token) {
			case TOK_STARTS:
				seenbit = 1;
				lease.starts = t;
				break;

			case TOK_ENDS:
				seenbit = 2;
				lease.ends = t;
				break;

			case TOK_TIMESTAMP:
				seenbit = 4;
				lease.timestamp = t;
				break;

			default:
				/*NOTREACHED*/
				seenbit = 0;
				break;
			}
		} else {
			switch (token) {
				/* Colon-separated hexadecimal octets. */
			case TOK_UID:
				seenbit = 8;
				token = peek_token(&val, cfile);
				if (token == TOK_STRING) {
					token = next_token(&val, cfile);
					lease.uid_len = strlen(val);
					lease.uid = malloc(lease.uid_len);
					if (!lease.uid) {
						log_warnx("no space for uid");
						return NULL;
					}
					memcpy(lease.uid, val, lease.uid_len);
					parse_semi(cfile);
				} else {
					lease.uid_len = 0;
					lease.uid =
					    parse_numeric_aggregate(cfile,
					    NULL, &lease.uid_len, ':', 16, 8);
					if (!lease.uid) {
						log_warnx("no space for uid");
						return NULL;
					}
					if (lease.uid_len == 0) {
						lease.uid = NULL;
						parse_warn("zero-length uid");
						seenbit = 0;
						break;
					}
				}
				if (!lease.uid)
					fatalx("No memory for lease uid");
				break;

			case TOK_CLASS:
				seenbit = 32;
				token = next_token(&val, cfile);
				if (!is_identifier(token)) {
					if (token != ';')
						skip_to_semi(cfile);
					return NULL;
				}
				/* for now, we aren't using this. */
				break;

			case TOK_HARDWARE:
				seenbit = 64;
				parse_hardware_param(cfile,
				    &lease.hardware_addr);
				break;

			case TOK_DYNAMIC_BOOTP:
				seenbit = 128;
				lease.flags |= BOOTP_LEASE;
				break;

			case TOK_ABANDONED:
				seenbit = 256;
				lease.flags |= ABANDONED_LEASE;
				break;

			case TOK_HOSTNAME:
				seenbit = 512;
				token = peek_token(&val, cfile);
				if (token == TOK_STRING)
					lease.hostname = parse_string(cfile);
				else
					lease.hostname =
					    parse_host_name(cfile);
				if (!lease.hostname) {
					seenbit = 0;
					return NULL;
				}
				break;

			case TOK_CLIENT_HOSTNAME:
				seenbit = 1024;
				token = peek_token(&val, cfile);
				if (token == TOK_STRING)
					lease.client_hostname =
					    parse_string(cfile);
				else
					lease.client_hostname =
					    parse_host_name(cfile);
				break;

			default:
				skip_to_semi(cfile);
				seenbit = 0;
				return NULL;
			}

			if (token != TOK_HARDWARE && token != TOK_STRING) {
				token = next_token(&val, cfile);
				if (token != ';') {
					parse_warn("semicolon expected.");
					skip_to_semi(cfile);
					return NULL;
				}
			}
		}
		if (seenmask & seenbit) {
			parse_warn("Too many %s parameters in lease %s\n",
			    tbuf, piaddr(lease.ip_addr));
		} else
			seenmask |= seenbit;

	} while (1);
	return &lease;
}

/*
 * address-range-declaration :== ip-address ip-address SEMI
 *			       | DYNAMIC_BOOTP ip-address ip-address SEMI
 */
void
parse_address_range(FILE *cfile, struct subnet *subnet)
{
	struct iaddr low, high;
	unsigned char addr[4];
	int len = sizeof addr, token, dynamic = 0;
	char *val;

	if ((token = peek_token(&val, cfile)) == TOK_DYNAMIC_BOOTP) {
		token = next_token(&val, cfile);
		subnet->group->dynamic_bootp = dynamic = 1;
	}

	/* Get the bottom address in the range. */
	if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8))
		return;
	memcpy(low.iabuf, addr, len);
	low.len = len;

	/* Only one address? */
	token = peek_token(&val, cfile);
	if (token == ';')
		high = low;
	else {
		/* Get the top address in the range. */
		if (!parse_numeric_aggregate(cfile, addr, &len, '.', 10, 8))
			return;
		memcpy(high.iabuf, addr, len);
		high.len = len;
	}

	token = next_token(&val, cfile);
	if (token != ';') {
		parse_warn("semicolon expected.");
		skip_to_semi(cfile);
		return;
	}

	/* Create the new address range. */
	new_address_range(low, high, subnet, dynamic);
}

static void
push_domain_list(char ***domains, size_t *count, char *domain)
{
	*domains = reallocarray(*domains, *count + 1, sizeof **domains);
	if (!*domains)
		fatalx("Can't allocate domain list");

	(*domains)[*count] = domain;
	++*count;
}

static void
free_domain_list(char **domains, size_t count)
{
	size_t i;

	for (i = 0; i < count; i++)
		free(domains[i]);
	free(domains);
}

struct tree *
parse_domain_and_comp(FILE *cfile)
{
	struct tree	 *rv = NULL;
	char		**domains = NULL;
	char		 *val, *domain;
	unsigned char	 *buf = NULL;
	unsigned char	**bufptrs = NULL;
	size_t		  bufsiz = 0, bufn = 0, count = 0, i;
	int		  token = ';';

	do {
		if (token == ',')
			token = next_token(&val, cfile);

		token = next_token(&val, cfile);
		if (token != TOK_STRING) {
			parse_warn("string expected");
			goto error;
		}
		domain = strdup(val);
		if (domain == NULL)
			fatalx("Can't allocate domain to compress");
		push_domain_list(&domains, &count, domain);

		/*
		 * openbsd.org normally compresses to [7]openbsd[3]org[0].
		 * +2 to string length provides space for leading and
		 * trailing (root) prefix lengths not already accounted for
		 * by dots, and also provides sufficient space for pointer
		 * compression.
		 */
		bufsiz = bufsiz + 2 + strlen(domain);
		token = peek_token(NULL, cfile);
	} while (token == ',');

	buf = malloc(bufsiz);
	if (!buf)
		fatalx("Can't allocate compressed domain buffer");
	bufptrs = calloc(count + 1, sizeof *bufptrs);
	if (!bufptrs)
		fatalx("Can't allocate compressed pointer list");
	bufptrs[0] = buf;

	/* dn_comp takes an int for the output buffer size */
	if (!(bufsiz <= INT_MAX))
		fatalx("Size of compressed domain buffer too large");
	for (i = 0; i < count; i++) {
		int n;

		/* see bufsiz <= INT_MAX assertion, above */
		n = dn_comp(domains[i], &buf[bufn], bufsiz - bufn, bufptrs,
		    &bufptrs[count + 1]);
		if (n == -1)
			fatalx("Can't compress domain");
		bufn += (size_t)n;
	}

	rv = tree_const(buf, bufn);
error:
	free_domain_list(domains, count);
	free(buf);
	free(bufptrs);
	return rv;
}