summaryrefslogtreecommitdiffstats
path: root/contrib/ldns/host2wire.c
blob: de1e01e9ba3f074cf571496a6a9834117b4e30d2 (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
/*
 * host2wire.c
 *
 * conversion routines from the host to the wire format.
 * This will usually just a re-ordering of the
 * data (as we store it in network format)
 *
 * a Net::DNS like library for C
 *
 * (c) NLnet Labs, 2004-2006
 *
 * See the file LICENSE for the license
 */

#include <ldns/config.h>

#include <ldns/ldns.h>

/* TODO Jelte
  add a pointer to a 'possiblecompression' structure
  to all the needed functions?
  something like an array of name, pointer values?
  every dname part could be added to it
*/

ldns_status
ldns_dname2buffer_wire(ldns_buffer *buffer, const ldns_rdf *name)
{
	if (ldns_buffer_reserve(buffer, ldns_rdf_size(name))) {
		ldns_buffer_write(buffer, ldns_rdf_data(name), ldns_rdf_size(name));
	}
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rdf2buffer_wire(ldns_buffer *buffer, const ldns_rdf *rdf)
{
	if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
		ldns_buffer_write(buffer, ldns_rdf_data(rdf), ldns_rdf_size(rdf));
	}
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rdf2buffer_wire_canonical(ldns_buffer *buffer, const ldns_rdf *rdf)
{
	size_t i;
	uint8_t *rdf_data;

	if (ldns_rdf_get_type(rdf) == LDNS_RDF_TYPE_DNAME) {
		if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
			rdf_data = ldns_rdf_data(rdf);
			for (i = 0; i < ldns_rdf_size(rdf); i++) {
				ldns_buffer_write_u8(buffer,
				    (uint8_t) LDNS_DNAME_NORMALIZE((int)rdf_data[i]));
			}
		}
	} else {
		/* direct copy for all other types */
		if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
			ldns_buffer_write(buffer,
						   ldns_rdf_data(rdf),
						   ldns_rdf_size(rdf));
		}
	}
	return ldns_buffer_status(buffer);
}

/* convert a rr list to wireformat */
ldns_status
ldns_rr_list2buffer_wire(ldns_buffer *buffer,const ldns_rr_list *rr_list)
{
	uint16_t rr_count;
	uint16_t i;

	rr_count = ldns_rr_list_rr_count(rr_list);
	for(i = 0; i < rr_count; i++) {
		(void)ldns_rr2buffer_wire(buffer, ldns_rr_list_rr(rr_list, i), 
					  LDNS_SECTION_ANY);
	}
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rr2buffer_wire_canonical(ldns_buffer *buffer,
						const ldns_rr *rr,
						int section)
{
	uint16_t i;
	uint16_t rdl_pos = 0;
	bool pre_rfc3597 = false;
	switch (ldns_rr_get_type(rr)) {
	case LDNS_RR_TYPE_NS:
	case LDNS_RR_TYPE_MD:
	case LDNS_RR_TYPE_MF:
	case LDNS_RR_TYPE_CNAME:
	case LDNS_RR_TYPE_SOA:
	case LDNS_RR_TYPE_MB:
	case LDNS_RR_TYPE_MG:
	case LDNS_RR_TYPE_MR:
	case LDNS_RR_TYPE_PTR:
	case LDNS_RR_TYPE_HINFO:
	case LDNS_RR_TYPE_MINFO:
	case LDNS_RR_TYPE_MX:
	case LDNS_RR_TYPE_RP:
	case LDNS_RR_TYPE_AFSDB:
	case LDNS_RR_TYPE_RT:
	case LDNS_RR_TYPE_SIG:
	case LDNS_RR_TYPE_PX:
	case LDNS_RR_TYPE_NXT:
	case LDNS_RR_TYPE_NAPTR:
	case LDNS_RR_TYPE_KX:
	case LDNS_RR_TYPE_SRV:
	case LDNS_RR_TYPE_DNAME:
	case LDNS_RR_TYPE_A6:
	case LDNS_RR_TYPE_RRSIG:
		pre_rfc3597 = true;
		break;
	default:
		break;
	}
	
	if (ldns_rr_owner(rr)) {
		(void) ldns_rdf2buffer_wire_canonical(buffer, ldns_rr_owner(rr));
	}
	
	if (ldns_buffer_reserve(buffer, 4)) {
		(void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
		(void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
	}

	if (section != LDNS_SECTION_QUESTION) {
		if (ldns_buffer_reserve(buffer, 6)) {
			ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
			/* remember pos for later */
			rdl_pos = ldns_buffer_position(buffer);
			ldns_buffer_write_u16(buffer, 0);
		}	

		for (i = 0; i < ldns_rr_rd_count(rr); i++) {
			if (pre_rfc3597) {
				(void) ldns_rdf2buffer_wire_canonical(
						buffer, ldns_rr_rdf(rr, i));
			} else {
				(void) ldns_rdf2buffer_wire(
						buffer, ldns_rr_rdf(rr, i));
			}
		}
		
		if (rdl_pos != 0) {
			ldns_buffer_write_u16_at(buffer, rdl_pos,
			                         ldns_buffer_position(buffer)
		        	                   - rdl_pos - 2);
		}
	}
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rr2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr, int section)
{
	uint16_t i;
	uint16_t rdl_pos = 0;
	
	if (ldns_rr_owner(rr)) {
		(void) ldns_dname2buffer_wire(buffer, ldns_rr_owner(rr));
	}
	
	if (ldns_buffer_reserve(buffer, 4)) {
		(void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
		(void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
	}

	if (section != LDNS_SECTION_QUESTION) {
		if (ldns_buffer_reserve(buffer, 6)) {
			ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
			/* remember pos for later */
			rdl_pos = ldns_buffer_position(buffer);
			ldns_buffer_write_u16(buffer, 0);
		}	

		for (i = 0; i < ldns_rr_rd_count(rr); i++) {
			(void) ldns_rdf2buffer_wire(
					buffer, ldns_rr_rdf(rr, i));
		}
		
		if (rdl_pos != 0) {
			ldns_buffer_write_u16_at(buffer, rdl_pos,
			                         ldns_buffer_position(buffer)
		        	                   - rdl_pos - 2);
		}
	}
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rrsig2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
{
	uint16_t i;

	/* it must be a sig RR */
	if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_RRSIG) {
		return LDNS_STATUS_ERR;
	}
	
	/* Convert all the rdfs, except the actual signature data
	 * rdf number 8  - the last, hence: -1 */
	for (i = 0; i < ldns_rr_rd_count(rr) - 1; i++) {
		(void) ldns_rdf2buffer_wire_canonical(buffer, ldns_rr_rdf(rr, i));
	}

	return ldns_buffer_status(buffer);
}

ldns_status
ldns_rr_rdata2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
{
	uint16_t i;
	/* convert all the rdf's */
	for (i = 0; i < ldns_rr_rd_count(rr); i++) {
		(void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr, i));
	}

	return ldns_buffer_status(buffer);
}

/*
 * Copies the packet header data to the buffer in wire format
 */
static ldns_status
ldns_hdr2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
{
	uint8_t flags;
	uint16_t arcount;
	
	if (ldns_buffer_reserve(buffer, 12)) {
		ldns_buffer_write_u16(buffer, ldns_pkt_id(packet));
		
		flags = ldns_pkt_qr(packet) << 7
		        | ldns_pkt_get_opcode(packet) << 3
		        | ldns_pkt_aa(packet) << 2
		        | ldns_pkt_tc(packet) << 1 | ldns_pkt_rd(packet);
		ldns_buffer_write_u8(buffer, flags);
		
		flags = ldns_pkt_ra(packet) << 7
		        /*| ldns_pkt_z(packet) << 6*/
		        | ldns_pkt_ad(packet) << 5
		        | ldns_pkt_cd(packet) << 4 | ldns_pkt_get_rcode(packet);
		ldns_buffer_write_u8(buffer, flags);
		
		ldns_buffer_write_u16(buffer, ldns_pkt_qdcount(packet));
		ldns_buffer_write_u16(buffer, ldns_pkt_ancount(packet));
		ldns_buffer_write_u16(buffer, ldns_pkt_nscount(packet));
		/* add EDNS0 and TSIG to additional if they are there */
		arcount = ldns_pkt_arcount(packet);
		if (ldns_pkt_tsig(packet)) {
			arcount++;
		}
		if (ldns_pkt_edns(packet)) {
			arcount++;
		}
		ldns_buffer_write_u16(buffer, arcount);
	}
	
	return ldns_buffer_status(buffer);
}

ldns_status
ldns_pkt2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
{
	ldns_rr_list *rr_list;
	uint16_t i;
	
	/* edns tmp vars */
	ldns_rr *edns_rr;
	uint8_t edata[4];
	
	(void) ldns_hdr2buffer_wire(buffer, packet);

	rr_list = ldns_pkt_question(packet);
	if (rr_list) {
		for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
			(void) ldns_rr2buffer_wire(buffer, 
			             ldns_rr_list_rr(rr_list, i), LDNS_SECTION_QUESTION);
		}
	}
	rr_list = ldns_pkt_answer(packet);
	if (rr_list) {
		for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
			(void) ldns_rr2buffer_wire(buffer, 
			             ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ANSWER);
		}
	}
	rr_list = ldns_pkt_authority(packet);
	if (rr_list) {
		for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
			(void) ldns_rr2buffer_wire(buffer, 
			             ldns_rr_list_rr(rr_list, i), LDNS_SECTION_AUTHORITY);
		}
	}
	rr_list = ldns_pkt_additional(packet);
	if (rr_list) {
		for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
			(void) ldns_rr2buffer_wire(buffer, 
			             ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ADDITIONAL);
		}
	}
	
	/* add EDNS to additional if it is needed */
	if (ldns_pkt_edns(packet)) {
		edns_rr = ldns_rr_new();
		if(!edns_rr) return LDNS_STATUS_MEM_ERR;
		ldns_rr_set_owner(edns_rr,
				ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, "."));
		ldns_rr_set_type(edns_rr, LDNS_RR_TYPE_OPT);
		ldns_rr_set_class(edns_rr, ldns_pkt_edns_udp_size(packet));
		edata[0] = ldns_pkt_edns_extended_rcode(packet);
		edata[1] = ldns_pkt_edns_version(packet);
		ldns_write_uint16(&edata[2], ldns_pkt_edns_z(packet));
		ldns_rr_set_ttl(edns_rr, ldns_read_uint32(edata));
		/* don't forget to add the edns rdata (if any) */
		if (packet->_edns_data)
			ldns_rr_push_rdf (edns_rr, packet->_edns_data);
		(void)ldns_rr2buffer_wire(buffer, edns_rr, LDNS_SECTION_ADDITIONAL);
		/* take the edns rdata back out of the rr before we free rr */
		if (packet->_edns_data)
			(void)ldns_rr_pop_rdf (edns_rr);
		ldns_rr_free(edns_rr);
	}
	
	/* add TSIG to additional if it is there */
	if (ldns_pkt_tsig(packet)) {
		(void) ldns_rr2buffer_wire(buffer,
		                           ldns_pkt_tsig(packet), LDNS_SECTION_ADDITIONAL);
	}
	
	return LDNS_STATUS_OK;
}

ldns_status
ldns_rdf2wire(uint8_t **dest, const ldns_rdf *rdf, size_t *result_size)
{
	ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
	ldns_status status;
	*result_size = 0;
	*dest = NULL;
	if(!buffer) return LDNS_STATUS_MEM_ERR;
	
	status = ldns_rdf2buffer_wire(buffer, rdf);
	if (status == LDNS_STATUS_OK) {
		*result_size =  ldns_buffer_position(buffer);
		*dest = (uint8_t *) ldns_buffer_export(buffer);
	}
	ldns_buffer_free(buffer);
	return status;
}

ldns_status
ldns_rr2wire(uint8_t **dest, const ldns_rr *rr, int section, size_t *result_size)
{
	ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
	ldns_status status;
	*result_size = 0;
	*dest = NULL;
	if(!buffer) return LDNS_STATUS_MEM_ERR;
	
	status = ldns_rr2buffer_wire(buffer, rr, section);
	if (status == LDNS_STATUS_OK) {
		*result_size =  ldns_buffer_position(buffer);
		*dest = (uint8_t *) ldns_buffer_export(buffer);
	}
	ldns_buffer_free(buffer);
	return status;
}

ldns_status
ldns_pkt2wire(uint8_t **dest, const ldns_pkt *packet, size_t *result_size)
{
	ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
	ldns_status status;
	*result_size = 0;
	*dest = NULL;
	if(!buffer) return LDNS_STATUS_MEM_ERR;
	
	status = ldns_pkt2buffer_wire(buffer, packet);
	if (status == LDNS_STATUS_OK) {
		*result_size =  ldns_buffer_position(buffer);
		*dest = (uint8_t *) ldns_buffer_export(buffer);
	}
	ldns_buffer_free(buffer);
	return status;
}
OpenPOWER on IntegriCloud