File: ldns-testpkts.c

package info (click to toggle)
unbound 1.4.6-1+squeeze3
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 15,700 kB
  • ctags: 5,590
  • sloc: ansic: 56,606; sh: 10,753; yacc: 1,100; python: 1,086; makefile: 447; perl: 141
file content (882 lines) | stat: -rw-r--r-- 25,281 bytes parent folder | download | duplicates (4)
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
/*
 * ldns-testpkts. Data file parse for test packets, and query matching.
 *
 * Data storage for specially crafted replies for testing purposes.
 *
 * (c) NLnet Labs, 2005, 2006, 2007, 2008
 * See the file LICENSE for the license
 */

/**
 * \file
 * This is a debugging aid. It is not efficient, especially
 * with a long config file, but it can give any reply to any query.
 * This can help the developer pre-script replies for queries.
 *
 * You can specify a packet RR by RR with header flags to return.
 *
 * Missing features:
 *		- matching content different from reply content.
 *		- find way to adjust mangled packets?
 */

#include "config.h"
struct sockaddr_storage;
#include <ldns/ldns.h>
#include <errno.h>
#include "ldns-testpkts.h"

/** max line length */
#define MAX_LINE   10240	
/** string to show in warnings and errors */
static const char* prog_name = "ldns-testpkts";

#ifndef UTIL_LOG_H
/** verbosity definition for compat */
enum verbosity_value { NO_VERBOSE=0 };
#endif
/** logging routine, provided by caller */
void verbose(enum verbosity_value lvl, const char* msg, ...) ATTR_FORMAT(printf, 2, 3);

/** print error and exit */
static void error(const char* msg, ...)
{
	va_list args;
	va_start(args, msg);
	fprintf(stderr, "%s error: ", prog_name);
	vfprintf(stderr, msg, args);
	fprintf(stderr, "\n");
	fflush(stderr);
	va_end(args);
	exit(EXIT_FAILURE);
}

/** return if string is empty or comment */
static bool isendline(char c)
{
	if(c == ';' || c == '#' 
		|| c == '\n' || c == 0)
		return true;
	return false;
}

/** true if the string starts with the keyword given. Moves the str ahead. 
 * @param str: before keyword, afterwards after keyword and spaces.
 * @param keyword: the keyword to match
 * @return: true if keyword present. False otherwise, and str unchanged.
*/
static bool str_keyword(char** str, const char* keyword)
{
	size_t len = strlen(keyword);
	assert(str && keyword);
	if(strncmp(*str, keyword, len) != 0)
		return false;
	*str += len;
	while(isspace((int)**str))
		(*str)++;
	return true;
}

/** Add reply packet to entry */
static struct reply_packet*
entry_add_reply(struct entry* entry) 
{
	struct reply_packet* pkt = (struct reply_packet*)malloc(
		sizeof(struct reply_packet));
	struct reply_packet ** p = &entry->reply_list;
	pkt->next = NULL;
	pkt->packet_sleep = 0;
	pkt->reply = ldns_pkt_new();
	pkt->reply_from_hex = NULL;
	/* link at end */
	while(*p)
		p = &((*p)->next);
	*p = pkt;
	return pkt;
}

/** parse MATCH line */
static void matchline(char* line, struct entry* e)
{
	char* parse = line;
	while(*parse) {
		if(isendline(*parse)) 
			return;
		if(str_keyword(&parse, "opcode")) {
			e->match_opcode = true;
		} else if(str_keyword(&parse, "qtype")) {
			e->match_qtype = true;
		} else if(str_keyword(&parse, "qname")) {
			e->match_qname = true;
		} else if(str_keyword(&parse, "subdomain")) {
			e->match_subdomain = true;
		} else if(str_keyword(&parse, "all")) {
			e->match_all = true;
		} else if(str_keyword(&parse, "ttl")) {
			e->match_ttl = true;
		} else if(str_keyword(&parse, "DO")) {
			e->match_do = true;
		} else if(str_keyword(&parse, "noedns")) {
			e->match_noedns = true;
		} else if(str_keyword(&parse, "UDP")) {
			e->match_transport = transport_udp;
		} else if(str_keyword(&parse, "TCP")) {
			e->match_transport = transport_tcp;
		} else if(str_keyword(&parse, "serial")) {
			e->match_serial = true;
			if(*parse != '=' && *parse != ':')
				error("expected = or : in MATCH: %s", line);
			parse++;
			e->ixfr_soa_serial = (uint32_t)strtol(parse, (char**)&parse, 10);
			while(isspace((int)*parse)) 
				parse++;
		} else {
			error("could not parse MATCH: '%s'", parse);
		}
	}
}

/** parse REPLY line */
static void replyline(char* line, ldns_pkt *reply)
{
	char* parse = line;
	while(*parse) {
		if(isendline(*parse)) 
			return;
			/* opcodes */
		if(str_keyword(&parse, "QUERY")) {
			ldns_pkt_set_opcode(reply, LDNS_PACKET_QUERY);
		} else if(str_keyword(&parse, "IQUERY")) {
			ldns_pkt_set_opcode(reply, LDNS_PACKET_IQUERY);
		} else if(str_keyword(&parse, "STATUS")) {
			ldns_pkt_set_opcode(reply, LDNS_PACKET_STATUS);
		} else if(str_keyword(&parse, "NOTIFY")) {
			ldns_pkt_set_opcode(reply, LDNS_PACKET_NOTIFY);
		} else if(str_keyword(&parse, "UPDATE")) {
			ldns_pkt_set_opcode(reply, LDNS_PACKET_UPDATE);
			/* rcodes */
		} else if(str_keyword(&parse, "NOERROR")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NOERROR);
		} else if(str_keyword(&parse, "FORMERR")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_FORMERR);
		} else if(str_keyword(&parse, "SERVFAIL")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_SERVFAIL);
		} else if(str_keyword(&parse, "NXDOMAIN")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NXDOMAIN);
		} else if(str_keyword(&parse, "NOTIMPL")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NOTIMPL);
		} else if(str_keyword(&parse, "REFUSED")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_REFUSED);
		} else if(str_keyword(&parse, "YXDOMAIN")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_YXDOMAIN);
		} else if(str_keyword(&parse, "YXRRSET")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_YXRRSET);
		} else if(str_keyword(&parse, "NXRRSET")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NXRRSET);
		} else if(str_keyword(&parse, "NOTAUTH")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NOTAUTH);
		} else if(str_keyword(&parse, "NOTZONE")) {
			ldns_pkt_set_rcode(reply, LDNS_RCODE_NOTZONE);
			/* flags */
		} else if(str_keyword(&parse, "QR")) {
			ldns_pkt_set_qr(reply, true);
		} else if(str_keyword(&parse, "AA")) {
			ldns_pkt_set_aa(reply, true);
		} else if(str_keyword(&parse, "TC")) {
			ldns_pkt_set_tc(reply, true);
		} else if(str_keyword(&parse, "RD")) {
			ldns_pkt_set_rd(reply, true);
		} else if(str_keyword(&parse, "CD")) {
			ldns_pkt_set_cd(reply, true);
		} else if(str_keyword(&parse, "RA")) {
			ldns_pkt_set_ra(reply, true);
		} else if(str_keyword(&parse, "AD")) {
			ldns_pkt_set_ad(reply, true);
		} else if(str_keyword(&parse, "DO")) {
			ldns_pkt_set_edns_udp_size(reply, 4096);
			ldns_pkt_set_edns_do(reply, true);
		} else {
			error("could not parse REPLY: '%s'", parse);
		}
	}
}

/** parse ADJUST line */
static void adjustline(char* line, struct entry* e, 
	struct reply_packet* pkt)
{
	char* parse = line;
	while(*parse) {
		if(isendline(*parse)) 
			return;
		if(str_keyword(&parse, "copy_id")) {
			e->copy_id = true;
		} else if(str_keyword(&parse, "copy_query")) {
			e->copy_query = true;
		} else if(str_keyword(&parse, "sleep=")) {
			e->sleeptime = (unsigned int) strtol(parse, (char**)&parse, 10);
			while(isspace((int)*parse)) 
				parse++;
		} else if(str_keyword(&parse, "packet_sleep=")) {
			pkt->packet_sleep = (unsigned int) strtol(parse, (char**)&parse, 10);
			while(isspace((int)*parse)) 
				parse++;
		} else {
			error("could not parse ADJUST: '%s'", parse);
		}
	}
}

/** create new entry */
static struct entry* new_entry()
{
	struct entry* e = LDNS_MALLOC(struct entry);
	memset(e, 0, sizeof(e));
	e->match_opcode = false;
	e->match_qtype = false;
	e->match_qname = false;
	e->match_subdomain = false;
	e->match_all = false;
	e->match_ttl = false;
	e->match_do = false;
	e->match_noedns = false;
	e->match_serial = false;
	e->ixfr_soa_serial = 0;
	e->match_transport = transport_any;
	e->reply_list = NULL;
	e->copy_id = false;
	e->copy_query = false;
	e->sleeptime = 0;
	e->next = NULL;
	return e;
}

/**
 * Converts a hex string to binary data
 * @param hexstr: string of hex.
 * @param len: is the length of the string
 * @param buf: is the buffer to store the result in
 * @param offset: is the starting position in the result buffer
 * @param buf_len: is the length of buf.
 *
 * This function returns the length of the result
 */
static size_t
hexstr2bin(char *hexstr, int len, uint8_t *buf, size_t offset, size_t buf_len)
{
	char c;
	int i; 
	uint8_t int8 = 0;
	int sec = 0;
	size_t bufpos = 0;
	
	if (len % 2 != 0) {
		return 0;
	}

	for (i=0; i<len; i++) {
		c = hexstr[i];

		/* case insensitive, skip spaces */
		if (c != ' ') {
			if (c >= '0' && c <= '9') {
				int8 += c & 0x0f;  
			} else if (c >= 'a' && c <= 'z') {
				int8 += (c & 0x0f) + 9;   
			} else if (c >= 'A' && c <= 'Z') {
				int8 += (c & 0x0f) + 9;   
			} else {
				return 0;
			}
			 
			if (sec == 0) {
				int8 = int8 << 4;
				sec = 1;
			} else {
				if (bufpos + offset + 1 <= buf_len) {
					buf[bufpos+offset] = int8;
					int8 = 0;
					sec = 0; 
					bufpos++;
				} else {
					fprintf(stderr, "Buffer too small in hexstr2bin");
				}
			}
		}
        }
        return bufpos;
}

/** convert hex buffer to binary buffer */
static ldns_buffer *
data_buffer2wire(ldns_buffer *data_buffer)
{
	ldns_buffer *wire_buffer = NULL;
	int c;
	
	/* stat hack
	 * 0 = normal
	 * 1 = comment (skip to end of line)
	 * 2 = unprintable character found, read binary data directly
	 */
	size_t data_buf_pos = 0;
	int state = 0;
	uint8_t *hexbuf;
	int hexbufpos = 0;
	size_t wirelen;
	uint8_t *data_wire = (uint8_t *) ldns_buffer_export(data_buffer);
	uint8_t *wire = LDNS_XMALLOC(uint8_t, LDNS_MAX_PACKETLEN);
	
	hexbuf = LDNS_XMALLOC(uint8_t, LDNS_MAX_PACKETLEN);
	for (data_buf_pos = 0; data_buf_pos < ldns_buffer_position(data_buffer); data_buf_pos++) {
		c = (int) data_wire[data_buf_pos];
		
		if (state < 2 && !isascii(c)) {
			/*verbose("non ascii character found in file: (%d) switching to raw mode\n", c);*/
			state = 2;
		}
		switch (state) {
			case 0:
				if (	(c >= '0' && c <= '9') ||
					(c >= 'a' && c <= 'f') ||
					(c >= 'A' && c <= 'F') )
				{
					hexbuf[hexbufpos] = (uint8_t) c;
					hexbufpos++;
				} else if (c == ';') {
					state = 1;
				} else if (c == ' ' || c == '\t' || c == '\n') {
					/* skip whitespace */
				} 
				break;
			case 1:
				if (c == '\n' || c == EOF) {
					state = 0;
				}
				break;
			case 2:
				hexbuf[hexbufpos] = (uint8_t) c;
				hexbufpos++;
				break;
			default:
				error("unknown state while reading");
				LDNS_FREE(hexbuf);
				return 0;
				break;
		}
	}

	if (hexbufpos >= LDNS_MAX_PACKETLEN) {
		/*verbose("packet size reached\n");*/
	}
	
	/* lenient mode: length must be multiple of 2 */
	if (hexbufpos % 2 != 0) {
		hexbuf[hexbufpos] = (uint8_t) '0';
		hexbufpos++;
	}

	if (state < 2) {
		wirelen = hexstr2bin((char *) hexbuf, hexbufpos, wire, 0, LDNS_MAX_PACKETLEN);
		wire_buffer = ldns_buffer_new(wirelen);
		ldns_buffer_new_frm_data(wire_buffer, wire, wirelen);
	} else {
		error("Incomplete hex data, not at byte boundary\n");
	}
	LDNS_FREE(wire);
	LDNS_FREE(hexbuf);
	return wire_buffer;
}	

/** parse ORIGIN */
static void 
get_origin(const char* name, int lineno, ldns_rdf** origin, char* parse)
{
	/* snip off rest of the text so as to make the parse work in ldns */
	char* end;
	char store;
	ldns_status status;

	ldns_rdf_free(*origin);
	*origin = NULL;

	end=parse;
	while(!isspace((int)*end) && !isendline(*end))
		end++;
	store = *end;
	*end = 0;
	verbose(3, "parsing '%s'\n", parse);
	status = ldns_str2rdf_dname(origin, parse);
	*end = store;
	if (status != LDNS_STATUS_OK)
		error("%s line %d:\n\t%s: %s", name, lineno,
		ldns_get_errorstr_by_id(status), parse);
}

/* Reads one entry from file. Returns entry or NULL on error. */
struct entry*
read_entry(FILE* in, const char* name, int *lineno, uint32_t* default_ttl, 
	ldns_rdf** origin, ldns_rdf** prev_rr)
{
	struct entry* current = NULL;
	char line[MAX_LINE];
	char* parse;
	ldns_pkt_section add_section = LDNS_SECTION_QUESTION;
	struct reply_packet *cur_reply = NULL;
	bool reading_hex = false;
	ldns_buffer* hex_data_buffer = NULL;

	while(fgets(line, (int)sizeof(line), in) != NULL) {
		line[MAX_LINE-1] = 0;
		parse = line;
		(*lineno) ++;
		
		while(isspace((int)*parse))
			parse++;
		/* test for keywords */
		if(isendline(*parse))
			continue; /* skip comment and empty lines */
		if(str_keyword(&parse, "ENTRY_BEGIN")) {
			if(current) {
				error("%s line %d: previous entry does not ENTRY_END", 
					name, *lineno);
			}
			current = new_entry();
			current->lineno = *lineno;
			cur_reply = entry_add_reply(current);
			continue;
		} else if(str_keyword(&parse, "$ORIGIN")) {
			get_origin(name, *lineno, origin, parse);
			continue;
		} else if(str_keyword(&parse, "$TTL")) {
			*default_ttl = (uint32_t)atoi(parse);
			continue;
		}

		/* working inside an entry */
		if(!current) {
			error("%s line %d: expected ENTRY_BEGIN but got %s", 
				name, *lineno, line);
		}
		if(str_keyword(&parse, "MATCH")) {
			matchline(parse, current);
		} else if(str_keyword(&parse, "REPLY")) {
			replyline(parse, cur_reply->reply);
		} else if(str_keyword(&parse, "ADJUST")) {
			adjustline(parse, current, cur_reply);
		} else if(str_keyword(&parse, "EXTRA_PACKET")) {
			cur_reply = entry_add_reply(current);
		} else if(str_keyword(&parse, "SECTION")) {
			if(str_keyword(&parse, "QUESTION"))
				add_section = LDNS_SECTION_QUESTION;
			else if(str_keyword(&parse, "ANSWER"))
				add_section = LDNS_SECTION_ANSWER;
			else if(str_keyword(&parse, "AUTHORITY"))
				add_section = LDNS_SECTION_AUTHORITY;
			else if(str_keyword(&parse, "ADDITIONAL"))
				add_section = LDNS_SECTION_ADDITIONAL;
			else error("%s line %d: bad section %s", name, *lineno, parse);
		} else if(str_keyword(&parse, "HEX_ANSWER_BEGIN")) {
			hex_data_buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
			reading_hex = true;
		} else if(str_keyword(&parse, "HEX_ANSWER_END")) {
			if (!reading_hex) {
				error("%s line %d: HEX_ANSWER_END read but no HEX_ANSWER_BEGIN keyword seen", name, *lineno);
			}
			reading_hex = false;
			cur_reply->reply_from_hex = data_buffer2wire(hex_data_buffer);
			ldns_buffer_free(hex_data_buffer);
		} else if(str_keyword(&parse, "ENTRY_END")) {
			return current;
		} else if(reading_hex) {
			ldns_buffer_printf(hex_data_buffer, line);
		} else {
			/* it must be a RR, parse and add to packet. */
			ldns_rr* n = NULL;
			ldns_status status;
			if(add_section == LDNS_SECTION_QUESTION)
				status = ldns_rr_new_question_frm_str(
					&n, parse, *origin, prev_rr);
			else status = ldns_rr_new_frm_str(&n, parse, 
				*default_ttl, *origin, prev_rr);
			if(status != LDNS_STATUS_OK)
				error("%s line %d:\n\t%s: %s", name, *lineno,
					ldns_get_errorstr_by_id(status), parse);
			ldns_pkt_push_rr(cur_reply->reply, add_section, n);
		}

	}
	if (reading_hex) {
		error("%s: End of file reached while still reading hex, "
			"missing HEX_ANSWER_END\n", name);
	}
	if(current) {
		error("%s: End of file reached while reading entry. "
			"missing ENTRY_END\n", name);
	}
	return 0;
}

/* reads the canned reply file and returns a list of structs */
struct entry* 
read_datafile(const char* name)
{
	struct entry* list = NULL;
	struct entry* last = NULL;
	struct entry* current = NULL;
	FILE *in;
	int lineno = 0;
	uint32_t default_ttl = 0;
	ldns_rdf* origin = NULL;
	ldns_rdf* prev_rr = NULL;
	int entry_num = 0;

	if((in=fopen(name, "r")) == NULL) {
		error("could not open file %s: %s", name, strerror(errno));
	}

	while((current = read_entry(in, name, &lineno, &default_ttl, 
		&origin, &prev_rr)))
	{
		if(last)
			last->next = current;
		else	list = current;
		last = current;
		entry_num ++;
	}
	verbose(1, "%s: Read %d entries\n", prog_name, entry_num);

	fclose(in);
	ldns_rdf_deep_free(origin);
	ldns_rdf_deep_free(prev_rr);
	return list;
}

/** get qtype from rr */
static ldns_rr_type get_qtype(ldns_pkt* p)
{
	if(!ldns_rr_list_rr(ldns_pkt_question(p), 0))
		return 0;
	return ldns_rr_get_type(ldns_rr_list_rr(ldns_pkt_question(p), 0));
}

/** returns owner from rr */
static ldns_rdf* get_owner(ldns_pkt* p)
{
	if(!ldns_rr_list_rr(ldns_pkt_question(p), 0))
		return NULL;
	return ldns_rr_owner(ldns_rr_list_rr(ldns_pkt_question(p), 0));
}

/** get authority section SOA serial value */
static uint32_t get_serial(ldns_pkt* p)
{
	ldns_rr *rr = ldns_rr_list_rr(ldns_pkt_authority(p), 0);
	ldns_rdf *rdf;
	uint32_t val;
	if(!rr) return 0;
	rdf = ldns_rr_rdf(rr, 2);
	if(!rdf) return 0;
	val = ldns_rdf2native_int32(rdf);
	verbose(3, "found serial %u in msg. ", (int)val);
	return val;
}

/** match two rr lists */
static int
match_list(ldns_rr_list* q, ldns_rr_list *p, bool mttl)
{
	size_t i;
	if(ldns_rr_list_rr_count(q) != ldns_rr_list_rr_count(p))
		return 0;
	for(i=0; i<ldns_rr_list_rr_count(q); i++)
	{
		if(ldns_rr_compare(ldns_rr_list_rr(q, i), 
			ldns_rr_list_rr(p, i)) != 0) {
			verbose(3, "rr %d different", (int)i);
			return 0;
		}
		if(mttl && ldns_rr_ttl(ldns_rr_list_rr(q, i)) !=
			ldns_rr_ttl(ldns_rr_list_rr(p, i))) {
			verbose(3, "rr %d ttl different", (int)i);
			return 0;
		}
	}
	return 1;
}

/** compare two booleans */
static int
cmp_bool(int x, int y)
{
	if(!x && !y) return 0;
	if(x && y) return 0;
	if(!x) return -1;
	return 1;
}

/** match all of the packet */
static int
match_all(ldns_pkt* q, ldns_pkt* p, bool mttl)
{
	if(ldns_pkt_get_opcode(q) != ldns_pkt_get_opcode(p)) 
	{ verbose(3, "allmatch: opcode different"); return 0;}
	if(ldns_pkt_get_rcode(q) != ldns_pkt_get_rcode(p))
	{ verbose(3, "allmatch: rcode different"); return 0;}
	if(ldns_pkt_id(q) != ldns_pkt_id(p))
	{ verbose(3, "allmatch: id different"); return 0;}
	if(cmp_bool(ldns_pkt_qr(q), ldns_pkt_qr(p)) != 0)
	{ verbose(3, "allmatch: qr different"); return 0;}
	if(cmp_bool(ldns_pkt_aa(q), ldns_pkt_aa(p)) != 0)
	{ verbose(3, "allmatch: aa different"); return 0;}
	if(cmp_bool(ldns_pkt_tc(q), ldns_pkt_tc(p)) != 0)
	{ verbose(3, "allmatch: tc different"); return 0;}
	if(cmp_bool(ldns_pkt_rd(q), ldns_pkt_rd(p)) != 0)
	{ verbose(3, "allmatch: rd different"); return 0;}
	if(cmp_bool(ldns_pkt_cd(q), ldns_pkt_cd(p)) != 0)
	{ verbose(3, "allmatch: cd different"); return 0;}
	if(cmp_bool(ldns_pkt_ra(q), ldns_pkt_ra(p)) != 0)
	{ verbose(3, "allmatch: ra different"); return 0;}
	if(cmp_bool(ldns_pkt_ad(q), ldns_pkt_ad(p)) != 0)
	{ verbose(3, "allmatch: ad different"); return 0;}
	if(ldns_pkt_qdcount(q) != ldns_pkt_qdcount(p))
	{ verbose(3, "allmatch: qdcount different"); return 0;}
	if(ldns_pkt_ancount(q) != ldns_pkt_ancount(p))
	{ verbose(3, "allmatch: ancount different"); return 0;}
	if(ldns_pkt_nscount(q) != ldns_pkt_nscount(p))
	{ verbose(3, "allmatch: nscount different"); return 0;}
	if(ldns_pkt_arcount(q) != ldns_pkt_arcount(p))
	{ verbose(3, "allmatch: arcount different"); return 0;}
	if(!match_list(ldns_pkt_question(q), ldns_pkt_question(p), 0))
	{ verbose(3, "allmatch: qd section different"); return 0;}
	if(!match_list(ldns_pkt_answer(q), ldns_pkt_answer(p), mttl))
	{ verbose(3, "allmatch: an section different"); return 0;}
	if(!match_list(ldns_pkt_authority(q), ldns_pkt_authority(p), mttl))
	{ verbose(3, "allmatch: ar section different"); return 0;}
	if(!match_list(ldns_pkt_additional(q), ldns_pkt_additional(p), mttl)) 
	{ verbose(3, "allmatch: ns section different"); return 0;}
	return 1;
}

/* finds entry in list, or returns NULL */
struct entry* 
find_match(struct entry* entries, ldns_pkt* query_pkt,
	enum transport_type transport)
{
	struct entry* p = entries;
	ldns_pkt* reply = NULL;
	for(p=entries; p; p=p->next) {
		verbose(3, "comparepkt: ");
		reply = p->reply_list->reply;
		if(p->match_opcode && ldns_pkt_get_opcode(query_pkt) != 
			ldns_pkt_get_opcode(reply)) {
			verbose(3, "bad opcode\n");
			continue;
		}
		if(p->match_qtype && get_qtype(query_pkt) != get_qtype(reply)) {
			verbose(3, "bad qtype\n");
			continue;
		}
		if(p->match_qname) {
			if(!get_owner(query_pkt) || !get_owner(reply) ||
				ldns_dname_compare(
				get_owner(query_pkt), get_owner(reply)) != 0) {
				verbose(3, "bad qname\n");
				continue;
			}
		}
		if(p->match_subdomain) {
			if(!get_owner(query_pkt) || !get_owner(reply) ||
				(ldns_dname_compare(get_owner(query_pkt), 
				get_owner(reply)) != 0 &&
				!ldns_dname_is_subdomain(
				get_owner(query_pkt), get_owner(reply))))
			{
				verbose(3, "bad subdomain\n");
				continue;
			}
		}
		if(p->match_serial && get_serial(query_pkt) != p->ixfr_soa_serial) {
				verbose(3, "bad serial\n");
				continue;
		}
		if(p->match_do && !ldns_pkt_edns_do(query_pkt)) {
			verbose(3, "no DO bit set\n");
			continue;
		}
		if(p->match_noedns && ldns_pkt_edns(query_pkt)) {
			verbose(3, "bad; EDNS OPT present\n");
			continue;
		}
		if(p->match_transport != transport_any && p->match_transport != transport) {
			verbose(3, "bad transport\n");
			continue;
		}
		if(p->match_all && !match_all(query_pkt, reply, p->match_ttl)) {
			verbose(3, "bad allmatch\n");
			continue;
		}
		verbose(3, "match!\n");
		return p;
	}
	return NULL;
}

void
adjust_packet(struct entry* match, ldns_pkt* answer_pkt, ldns_pkt* query_pkt)
{
	/* copy & adjust packet */
	if(match->copy_id)
		ldns_pkt_set_id(answer_pkt, ldns_pkt_id(query_pkt));
	if(match->copy_query) {
		ldns_rr_list* list = ldns_pkt_get_section_clone(query_pkt,
			LDNS_SECTION_QUESTION);
		ldns_rr_list_deep_free(ldns_pkt_question(answer_pkt));
		ldns_pkt_set_question(answer_pkt, list);
	}
	if(match->sleeptime > 0) {
		verbose(3, "sleeping for %d seconds\n", match->sleeptime);
#ifdef HAVE_SLEEP
		sleep(match->sleeptime);
#else
		Sleep(match->sleeptime * 1000);
#endif
	}
}

/*
 * Parses data buffer to a query, finds the correct answer 
 * and calls the given function for every packet to send.
 */
void
handle_query(uint8_t* inbuf, ssize_t inlen, struct entry* entries, int* count,
	enum transport_type transport, void (*sendfunc)(uint8_t*, size_t, void*),
	void* userdata, FILE* verbose_out)
{
	ldns_status status;
	ldns_pkt *query_pkt = NULL;
	ldns_pkt *answer_pkt = NULL;
	struct reply_packet *p;
	ldns_rr *query_rr = NULL;
	uint8_t *outbuf = NULL;
	size_t answer_size = 0;
	struct entry* entry = NULL;
	ldns_rdf *stop_command = ldns_dname_new_frm_str("server.stop.");

	status = ldns_wire2pkt(&query_pkt, inbuf, (size_t)inlen);
	if (status != LDNS_STATUS_OK) {
		verbose(1, "Got bad packet: %s\n", ldns_get_errorstr_by_id(status));
		ldns_rdf_free(stop_command);
		return;
	}
	
	query_rr = ldns_rr_list_rr(ldns_pkt_question(query_pkt), 0);
	verbose(1, "query %d: id %d: %s %d bytes: ", ++(*count), (int)ldns_pkt_id(query_pkt), 
		(transport==transport_tcp)?"TCP":"UDP", (int)inlen);
	if(verbose_out) ldns_rr_print(verbose_out, query_rr);
	if(verbose_out) ldns_pkt_print(verbose_out, query_pkt);

	if (ldns_rr_get_type(query_rr) == LDNS_RR_TYPE_TXT &&
	    ldns_rr_get_class(query_rr) == LDNS_RR_CLASS_CH &&
	    ldns_dname_compare(ldns_rr_owner(query_rr), stop_command) == 0) {
		exit(0);
        }
	
	/* fill up answer packet */
	entry = find_match(entries, query_pkt, transport);
	if(!entry || !entry->reply_list) {
		verbose(1, "no answer packet for this query, no reply.\n");
		ldns_pkt_free(query_pkt);
		ldns_rdf_free(stop_command);
		return;
	}
	for(p = entry->reply_list; p; p = p->next)
	{
		verbose(3, "Answer pkt:\n");
		if (p->reply_from_hex) {
			/* try to parse the hex packet, if it can be
			 * parsed, we can use adjust rules. if not,
			 * send packet literally */
			status = ldns_buffer2pkt_wire(&answer_pkt, p->reply_from_hex);
			if (status == LDNS_STATUS_OK) {
				adjust_packet(entry, answer_pkt, query_pkt);
				if(verbose_out) ldns_pkt_print(verbose_out, answer_pkt);
				status = ldns_pkt2wire(&outbuf, answer_pkt, &answer_size);
				verbose(2, "Answer packet size: %u bytes.\n", (unsigned int)answer_size);
				if (status != LDNS_STATUS_OK) {
					verbose(1, "Error creating answer: %s\n", ldns_get_errorstr_by_id(status));
					ldns_pkt_free(query_pkt);
					ldns_rdf_free(stop_command);
					return;
				}
				ldns_pkt_free(answer_pkt);
				answer_pkt = NULL;
			} else {
				verbose(3, "Could not parse hex data (%s), sending hex data directly.\n", ldns_get_errorstr_by_id(status));
				/* still try to adjust ID */
				answer_size = ldns_buffer_capacity(p->reply_from_hex);
				outbuf = LDNS_XMALLOC(uint8_t, answer_size);
				memcpy(outbuf, ldns_buffer_export(p->reply_from_hex), answer_size);
				if(entry->copy_id) {
					ldns_write_uint16(outbuf, 
						ldns_pkt_id(query_pkt));
				}
			}
		} else {
			answer_pkt = ldns_pkt_clone(p->reply);
			adjust_packet(entry, answer_pkt, query_pkt);
			if(verbose_out) ldns_pkt_print(verbose_out, answer_pkt);
			status = ldns_pkt2wire(&outbuf, answer_pkt, &answer_size);
			verbose(1, "Answer packet size: %u bytes.\n", (unsigned int)answer_size);
			if (status != LDNS_STATUS_OK) {
				verbose(1, "Error creating answer: %s\n", ldns_get_errorstr_by_id(status));
				ldns_pkt_free(query_pkt);
				ldns_rdf_free(stop_command);
				return;
			}
			ldns_pkt_free(answer_pkt);
			answer_pkt = NULL;
		}
		if(p->packet_sleep) {
			verbose(3, "sleeping for next packet %d secs\n", 
				p->packet_sleep);
#ifdef HAVE_SLEEP
			sleep(p->packet_sleep);
#else
			Sleep(p->packet_sleep * 1000);
#endif
			verbose(3, "wakeup for next packet "
				"(slept %d secs)\n", p->packet_sleep);
		}
		sendfunc(outbuf, answer_size, userdata);
		LDNS_FREE(outbuf);
		outbuf = NULL;
		answer_size = 0;
	}
	ldns_pkt_free(query_pkt);
	ldns_rdf_free(stop_command);
}

/** delete the list of reply packets */
void delete_replylist(struct reply_packet* replist)
{
	struct reply_packet *p=replist, *np;
	while(p) {
		np = p->next;
		ldns_pkt_free(p->reply);
		ldns_buffer_free(p->reply_from_hex);
		free(p);
		p=np;
	}
}

void delete_entry(struct entry* list)
{
	struct entry *p=list, *np;
	while(p) {
		np = p->next;
		delete_replylist(p->reply_list);
		free(p);
		p = np;
	}
}