4 * conversion routines from the host to the wire format.
5 * This will usually just a re-ordering of the
6 * data (as we store it in network format)
8 * a Net::DNS like library for C
10 * (c) NLnet Labs, 2004-2006
12 * See the file LICENSE for the license
15 #include <ldns/config.h>
17 #include <ldns/ldns.h>
20 add a pointer to a 'possiblecompression' structure
21 to all the needed functions?
22 something like an array of name, pointer values?
23 every dname part could be added to it
27 ldns_dname2buffer_wire(ldns_buffer *buffer, const ldns_rdf *name)
29 if (ldns_buffer_reserve(buffer, ldns_rdf_size(name))) {
30 ldns_buffer_write(buffer, ldns_rdf_data(name), ldns_rdf_size(name));
32 return ldns_buffer_status(buffer);
36 ldns_rdf2buffer_wire(ldns_buffer *buffer, const ldns_rdf *rdf)
38 if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
39 ldns_buffer_write(buffer, ldns_rdf_data(rdf), ldns_rdf_size(rdf));
41 return ldns_buffer_status(buffer);
45 ldns_rdf2buffer_wire_canonical(ldns_buffer *buffer, const ldns_rdf *rdf)
50 if (ldns_rdf_get_type(rdf) == LDNS_RDF_TYPE_DNAME) {
51 if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
52 rdf_data = ldns_rdf_data(rdf);
53 for (i = 0; i < ldns_rdf_size(rdf); i++) {
54 ldns_buffer_write_u8(buffer,
55 (uint8_t) LDNS_DNAME_NORMALIZE((int)rdf_data[i]));
59 /* direct copy for all other types */
60 if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
61 ldns_buffer_write(buffer,
66 return ldns_buffer_status(buffer);
69 /* convert a rr list to wireformat */
71 ldns_rr_list2buffer_wire(ldns_buffer *buffer,const ldns_rr_list *rr_list)
76 rr_count = ldns_rr_list_rr_count(rr_list);
77 for(i = 0; i < rr_count; i++) {
78 (void)ldns_rr2buffer_wire(buffer, ldns_rr_list_rr(rr_list, i),
81 return ldns_buffer_status(buffer);
86 ldns_rr2buffer_wire_canonical(ldns_buffer *buffer,
92 bool pre_rfc3597 = false;
93 switch (ldns_rr_get_type(rr)) {
97 case LDNS_RR_TYPE_CNAME:
98 case LDNS_RR_TYPE_SOA:
100 case LDNS_RR_TYPE_MG:
101 case LDNS_RR_TYPE_MR:
102 case LDNS_RR_TYPE_PTR:
103 case LDNS_RR_TYPE_HINFO:
104 case LDNS_RR_TYPE_MINFO:
105 case LDNS_RR_TYPE_MX:
106 case LDNS_RR_TYPE_RP:
107 case LDNS_RR_TYPE_AFSDB:
108 case LDNS_RR_TYPE_RT:
109 case LDNS_RR_TYPE_SIG:
110 case LDNS_RR_TYPE_PX:
111 case LDNS_RR_TYPE_NXT:
112 case LDNS_RR_TYPE_NAPTR:
113 case LDNS_RR_TYPE_KX:
114 case LDNS_RR_TYPE_SRV:
115 case LDNS_RR_TYPE_DNAME:
116 case LDNS_RR_TYPE_A6:
117 case LDNS_RR_TYPE_RRSIG:
124 if (ldns_rr_owner(rr)) {
125 (void) ldns_rdf2buffer_wire_canonical(buffer, ldns_rr_owner(rr));
128 if (ldns_buffer_reserve(buffer, 4)) {
129 (void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
130 (void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
133 if (section != LDNS_SECTION_QUESTION) {
134 if (ldns_buffer_reserve(buffer, 6)) {
135 ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
136 /* remember pos for later */
137 rdl_pos = ldns_buffer_position(buffer);
138 ldns_buffer_write_u16(buffer, 0);
140 for (i = 0; i < ldns_rr_rd_count(rr); i++) {
142 (void) ldns_rdf2buffer_wire_canonical(
143 buffer, ldns_rr_rdf(rr, i));
145 (void) ldns_rdf2buffer_wire(
146 buffer, ldns_rr_rdf(rr, i));
150 ldns_buffer_write_u16_at(buffer, rdl_pos,
151 ldns_buffer_position(buffer)
155 return ldns_buffer_status(buffer);
159 ldns_rr2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr, int section)
162 uint16_t rdl_pos = 0;
164 if (ldns_rr_owner(rr)) {
165 (void) ldns_dname2buffer_wire(buffer, ldns_rr_owner(rr));
168 if (ldns_buffer_reserve(buffer, 4)) {
169 (void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
170 (void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
173 if (section != LDNS_SECTION_QUESTION) {
174 if (ldns_buffer_reserve(buffer, 6)) {
175 ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
176 /* remember pos for later */
177 rdl_pos = ldns_buffer_position(buffer);
178 ldns_buffer_write_u16(buffer, 0);
180 for (i = 0; i < ldns_rr_rd_count(rr); i++) {
181 (void) ldns_rdf2buffer_wire(
182 buffer, ldns_rr_rdf(rr, i));
185 ldns_buffer_write_u16_at(buffer, rdl_pos,
186 ldns_buffer_position(buffer)
190 return ldns_buffer_status(buffer);
194 ldns_rrsig2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
198 /* it must be a sig RR */
199 if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_RRSIG) {
200 return LDNS_STATUS_ERR;
203 /* Convert all the rdfs, except the actual signature data
204 * rdf number 8 - the last, hence: -1 */
205 for (i = 0; i < ldns_rr_rd_count(rr) - 1; i++) {
206 (void) ldns_rdf2buffer_wire_canonical(buffer,
210 return ldns_buffer_status(buffer);
214 ldns_rr_rdata2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
217 /* convert all the rdf's */
218 for (i = 0; i < ldns_rr_rd_count(rr); i++) {
219 (void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr,i));
221 return ldns_buffer_status(buffer);
225 * Copies the packet header data to the buffer in wire format
228 ldns_hdr2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
233 if (ldns_buffer_reserve(buffer, 12)) {
234 ldns_buffer_write_u16(buffer, ldns_pkt_id(packet));
236 flags = ldns_pkt_qr(packet) << 7
237 | ldns_pkt_get_opcode(packet) << 3
238 | ldns_pkt_aa(packet) << 2
239 | ldns_pkt_tc(packet) << 1 | ldns_pkt_rd(packet);
240 ldns_buffer_write_u8(buffer, flags);
242 flags = ldns_pkt_ra(packet) << 7
243 /*| ldns_pkt_z(packet) << 6*/
244 | ldns_pkt_ad(packet) << 5
245 | ldns_pkt_cd(packet) << 4
246 | ldns_pkt_get_rcode(packet);
247 ldns_buffer_write_u8(buffer, flags);
249 ldns_buffer_write_u16(buffer, ldns_pkt_qdcount(packet));
250 ldns_buffer_write_u16(buffer, ldns_pkt_ancount(packet));
251 ldns_buffer_write_u16(buffer, ldns_pkt_nscount(packet));
252 /* add EDNS0 and TSIG to additional if they are there */
253 arcount = ldns_pkt_arcount(packet);
254 if (ldns_pkt_tsig(packet)) {
257 if (ldns_pkt_edns(packet)) {
260 ldns_buffer_write_u16(buffer, arcount);
263 return ldns_buffer_status(buffer);
267 ldns_pkt2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
269 ldns_rr_list *rr_list;
276 (void) ldns_hdr2buffer_wire(buffer, packet);
278 rr_list = ldns_pkt_question(packet);
280 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
281 (void) ldns_rr2buffer_wire(buffer,
282 ldns_rr_list_rr(rr_list, i), LDNS_SECTION_QUESTION);
285 rr_list = ldns_pkt_answer(packet);
287 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
288 (void) ldns_rr2buffer_wire(buffer,
289 ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ANSWER);
292 rr_list = ldns_pkt_authority(packet);
294 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
295 (void) ldns_rr2buffer_wire(buffer,
296 ldns_rr_list_rr(rr_list, i), LDNS_SECTION_AUTHORITY);
299 rr_list = ldns_pkt_additional(packet);
301 for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
302 (void) ldns_rr2buffer_wire(buffer,
303 ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ADDITIONAL);
307 /* add EDNS to additional if it is needed */
308 if (ldns_pkt_edns(packet)) {
309 edns_rr = ldns_rr_new();
310 if(!edns_rr) return LDNS_STATUS_MEM_ERR;
311 ldns_rr_set_owner(edns_rr,
312 ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, "."));
313 ldns_rr_set_type(edns_rr, LDNS_RR_TYPE_OPT);
314 ldns_rr_set_class(edns_rr, ldns_pkt_edns_udp_size(packet));
315 edata[0] = ldns_pkt_edns_extended_rcode(packet);
316 edata[1] = ldns_pkt_edns_version(packet);
317 ldns_write_uint16(&edata[2], ldns_pkt_edns_z(packet));
318 ldns_rr_set_ttl(edns_rr, ldns_read_uint32(edata));
319 /* don't forget to add the edns rdata (if any) */
320 if (packet->_edns_data)
321 ldns_rr_push_rdf (edns_rr, packet->_edns_data);
322 (void)ldns_rr2buffer_wire(buffer, edns_rr, LDNS_SECTION_ADDITIONAL);
323 /* take the edns rdata back out of the rr before we free rr */
324 if (packet->_edns_data)
325 (void)ldns_rr_pop_rdf (edns_rr);
326 ldns_rr_free(edns_rr);
329 /* add TSIG to additional if it is there */
330 if (ldns_pkt_tsig(packet)) {
331 (void) ldns_rr2buffer_wire(buffer,
332 ldns_pkt_tsig(packet), LDNS_SECTION_ADDITIONAL);
335 return LDNS_STATUS_OK;
339 ldns_rdf2wire(uint8_t **dest, const ldns_rdf *rdf, size_t *result_size)
341 ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
345 if(!buffer) return LDNS_STATUS_MEM_ERR;
347 status = ldns_rdf2buffer_wire(buffer, rdf);
348 if (status == LDNS_STATUS_OK) {
349 *result_size = ldns_buffer_position(buffer);
350 *dest = (uint8_t *) ldns_buffer_export(buffer);
352 ldns_buffer_free(buffer);
357 ldns_rr2wire(uint8_t **dest, const ldns_rr *rr, int section, size_t *result_size)
359 ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
363 if(!buffer) return LDNS_STATUS_MEM_ERR;
365 status = ldns_rr2buffer_wire(buffer, rr, section);
366 if (status == LDNS_STATUS_OK) {
367 *result_size = ldns_buffer_position(buffer);
368 *dest = (uint8_t *) ldns_buffer_export(buffer);
370 ldns_buffer_free(buffer);
375 ldns_pkt2wire(uint8_t **dest, const ldns_pkt *packet, size_t *result_size)
377 ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
381 if(!buffer) return LDNS_STATUS_MEM_ERR;
383 status = ldns_pkt2buffer_wire(buffer, packet);
384 if (status == LDNS_STATUS_OK) {
385 *result_size = ldns_buffer_position(buffer);
386 *dest = (uint8_t *) ldns_buffer_export(buffer);
388 ldns_buffer_free(buffer);