434 lines
11 KiB
C
434 lines
11 KiB
C
/*
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* host2wire.c
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*
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* conversion routines from the host to the wire format.
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* This will usually just a re-ordering of the
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* data (as we store it in network format)
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*
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* a Net::DNS like library for C
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*
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* (c) NLnet Labs, 2004-2006
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*
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* See the file LICENSE for the license
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*/
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#include <ldns/config.h>
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#include <ldns/ldns.h>
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/* TODO Jelte
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add a pointer to a 'possiblecompression' structure
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to all the needed functions?
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something like an array of name, pointer values?
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every dname part could be added to it
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*/
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ldns_status
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ldns_dname2buffer_wire(ldns_buffer *buffer, const ldns_rdf *name)
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{
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if (ldns_buffer_reserve(buffer, ldns_rdf_size(name))) {
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ldns_buffer_write(buffer, ldns_rdf_data(name), ldns_rdf_size(name));
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rdf2buffer_wire(ldns_buffer *buffer, const ldns_rdf *rdf)
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{
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if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
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ldns_buffer_write(buffer, ldns_rdf_data(rdf), ldns_rdf_size(rdf));
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rdf2buffer_wire_canonical(ldns_buffer *buffer, const ldns_rdf *rdf)
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{
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size_t i;
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uint8_t *rdf_data;
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if (ldns_rdf_get_type(rdf) == LDNS_RDF_TYPE_DNAME) {
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if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
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rdf_data = ldns_rdf_data(rdf);
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for (i = 0; i < ldns_rdf_size(rdf); i++) {
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ldns_buffer_write_u8(buffer,
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(uint8_t) LDNS_DNAME_NORMALIZE((int)rdf_data[i]));
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}
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}
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} else {
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/* direct copy for all other types */
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if (ldns_buffer_reserve(buffer, ldns_rdf_size(rdf))) {
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ldns_buffer_write(buffer,
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ldns_rdf_data(rdf),
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ldns_rdf_size(rdf));
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}
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}
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return ldns_buffer_status(buffer);
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}
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/* convert a rr list to wireformat */
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ldns_status
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ldns_rr_list2buffer_wire(ldns_buffer *buffer,const ldns_rr_list *rr_list)
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{
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uint16_t rr_count;
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uint16_t i;
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rr_count = ldns_rr_list_rr_count(rr_list);
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for(i = 0; i < rr_count; i++) {
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(void)ldns_rr2buffer_wire(buffer, ldns_rr_list_rr(rr_list, i),
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LDNS_SECTION_ANY);
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rr2buffer_wire_canonical(ldns_buffer *buffer,
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const ldns_rr *rr,
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int section)
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{
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uint16_t i;
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uint16_t rdl_pos = 0;
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bool pre_rfc3597 = false;
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switch (ldns_rr_get_type(rr)) {
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case LDNS_RR_TYPE_NS:
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case LDNS_RR_TYPE_MD:
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case LDNS_RR_TYPE_MF:
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case LDNS_RR_TYPE_CNAME:
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case LDNS_RR_TYPE_SOA:
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case LDNS_RR_TYPE_MB:
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case LDNS_RR_TYPE_MG:
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case LDNS_RR_TYPE_MR:
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case LDNS_RR_TYPE_PTR:
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case LDNS_RR_TYPE_HINFO:
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case LDNS_RR_TYPE_MINFO:
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case LDNS_RR_TYPE_MX:
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case LDNS_RR_TYPE_RP:
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case LDNS_RR_TYPE_AFSDB:
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case LDNS_RR_TYPE_RT:
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case LDNS_RR_TYPE_SIG:
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case LDNS_RR_TYPE_PX:
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case LDNS_RR_TYPE_NXT:
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case LDNS_RR_TYPE_NAPTR:
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case LDNS_RR_TYPE_KX:
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case LDNS_RR_TYPE_SRV:
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case LDNS_RR_TYPE_DNAME:
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case LDNS_RR_TYPE_A6:
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pre_rfc3597 = true;
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break;
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default:
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break;
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}
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if (ldns_rr_owner(rr)) {
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(void) ldns_rdf2buffer_wire_canonical(buffer, ldns_rr_owner(rr));
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}
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if (ldns_buffer_reserve(buffer, 4)) {
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(void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
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(void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
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}
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if (section != LDNS_SECTION_QUESTION) {
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if (ldns_buffer_reserve(buffer, 6)) {
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ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
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/* remember pos for later */
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rdl_pos = ldns_buffer_position(buffer);
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ldns_buffer_write_u16(buffer, 0);
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}
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for (i = 0; i < ldns_rr_rd_count(rr); i++) {
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if (pre_rfc3597) {
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(void) ldns_rdf2buffer_wire_canonical(buffer,
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ldns_rr_rdf(rr, i));
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} else {
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(void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr, i));
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}
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}
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if (rdl_pos != 0) {
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ldns_buffer_write_u16_at(buffer, rdl_pos,
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ldns_buffer_position(buffer)
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- rdl_pos - 2);
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}
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rr2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr, int section)
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{
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uint16_t i;
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uint16_t rdl_pos = 0;
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if (ldns_rr_owner(rr)) {
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(void) ldns_dname2buffer_wire(buffer, ldns_rr_owner(rr));
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}
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if (ldns_buffer_reserve(buffer, 4)) {
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(void) ldns_buffer_write_u16(buffer, ldns_rr_get_type(rr));
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(void) ldns_buffer_write_u16(buffer, ldns_rr_get_class(rr));
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}
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if (section != LDNS_SECTION_QUESTION) {
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if (ldns_buffer_reserve(buffer, 6)) {
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ldns_buffer_write_u32(buffer, ldns_rr_ttl(rr));
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/* remember pos for later */
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rdl_pos = ldns_buffer_position(buffer);
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ldns_buffer_write_u16(buffer, 0);
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}
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for (i = 0; i < ldns_rr_rd_count(rr); i++) {
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(void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr, i));
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}
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if (rdl_pos != 0) {
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ldns_buffer_write_u16_at(buffer, rdl_pos,
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ldns_buffer_position(buffer)
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- rdl_pos - 2);
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}
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rrsig2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
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{
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uint16_t i;
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/* it must be a sig RR */
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if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_RRSIG) {
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return LDNS_STATUS_ERR;
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}
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/* Convert all the rdfs, except the actual signature data
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* rdf number 8 - the last, hence: -1 */
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for (i = 0; i < ldns_rr_rd_count(rr) - 1; i++) {
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if (ldns_rr_rdf(rr, i)) {
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(void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr, i));
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}
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_rr_rdata2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
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{
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uint16_t i;
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/* convert all the rdf's */
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for (i = 0; i < ldns_rr_rd_count(rr); i++) {
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(void) ldns_rdf2buffer_wire(buffer, ldns_rr_rdf(rr, i));
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}
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return ldns_buffer_status(buffer);
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}
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/*
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* Copies the packet header data to the buffer in wire format
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*/
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static ldns_status
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ldns_hdr2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
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{
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uint8_t flags;
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uint16_t arcount;
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if (ldns_buffer_reserve(buffer, 12)) {
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ldns_buffer_write_u16(buffer, ldns_pkt_id(packet));
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flags = ldns_pkt_qr(packet) << 7
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| ldns_pkt_get_opcode(packet) << 3
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| ldns_pkt_aa(packet) << 2
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| ldns_pkt_tc(packet) << 1 | ldns_pkt_rd(packet);
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ldns_buffer_write_u8(buffer, flags);
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flags = ldns_pkt_ra(packet) << 7
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/*| ldns_pkt_z(packet) << 6*/
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| ldns_pkt_ad(packet) << 5
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| ldns_pkt_cd(packet) << 4 | ldns_pkt_get_rcode(packet);
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ldns_buffer_write_u8(buffer, flags);
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ldns_buffer_write_u16(buffer, ldns_pkt_qdcount(packet));
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ldns_buffer_write_u16(buffer, ldns_pkt_ancount(packet));
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ldns_buffer_write_u16(buffer, ldns_pkt_nscount(packet));
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/* add EDNS0 and TSIG to additional if they are there */
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arcount = ldns_pkt_arcount(packet);
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if (ldns_pkt_tsig(packet)) {
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arcount++;
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}
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if (ldns_pkt_edns(packet)) {
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arcount++;
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}
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ldns_buffer_write_u16(buffer, arcount);
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}
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return ldns_buffer_status(buffer);
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}
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ldns_status
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ldns_pkt2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
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{
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ldns_rr_list *rr_list;
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uint16_t i;
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/* edns tmp vars */
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ldns_rr *edns_rr;
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uint8_t edata[4];
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(void) ldns_hdr2buffer_wire(buffer, packet);
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rr_list = ldns_pkt_question(packet);
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if (rr_list) {
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for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire(buffer,
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ldns_rr_list_rr(rr_list, i), LDNS_SECTION_QUESTION);
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}
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}
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rr_list = ldns_pkt_answer(packet);
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if (rr_list) {
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for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire(buffer,
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ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ANSWER);
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}
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}
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rr_list = ldns_pkt_authority(packet);
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if (rr_list) {
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for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire(buffer,
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ldns_rr_list_rr(rr_list, i), LDNS_SECTION_AUTHORITY);
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}
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}
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rr_list = ldns_pkt_additional(packet);
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if (rr_list) {
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for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire(buffer,
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ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ADDITIONAL);
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}
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}
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/* add EDNS to additional if it is needed */
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if (ldns_pkt_edns(packet)) {
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edns_rr = ldns_rr_new();
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if(!edns_rr) return LDNS_STATUS_MEM_ERR;
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ldns_rr_set_owner(edns_rr,
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ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, "."));
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ldns_rr_set_type(edns_rr, LDNS_RR_TYPE_OPT);
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ldns_rr_set_class(edns_rr, ldns_pkt_edns_udp_size(packet));
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edata[0] = ldns_pkt_edns_extended_rcode(packet);
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edata[1] = ldns_pkt_edns_version(packet);
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ldns_write_uint16(&edata[2], ldns_pkt_edns_z(packet));
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ldns_rr_set_ttl(edns_rr, ldns_read_uint32(edata));
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/* don't forget to add the edns rdata (if any) */
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if (packet->_edns_data)
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ldns_rr_push_rdf (edns_rr, packet->_edns_data);
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(void)ldns_rr2buffer_wire(buffer, edns_rr, LDNS_SECTION_ADDITIONAL);
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/* take the edns rdata back out of the rr before we free rr */
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if (packet->_edns_data)
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(void)ldns_rr_pop_rdf (edns_rr);
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ldns_rr_free(edns_rr);
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}
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/* add TSIG to additional if it is there */
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if (ldns_pkt_tsig(packet)) {
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(void) ldns_rr2buffer_wire(buffer,
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ldns_pkt_tsig(packet), LDNS_SECTION_ADDITIONAL);
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}
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return LDNS_STATUS_OK;
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}
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ldns_status
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ldns_rdf2wire(uint8_t **dest, const ldns_rdf *rdf, size_t *result_size)
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{
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ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
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uint8_t *result = NULL;
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ldns_status status;
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*result_size = 0;
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*dest = NULL;
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if(!buffer) return LDNS_STATUS_MEM_ERR;
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status = ldns_rdf2buffer_wire(buffer, rdf);
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if (status == LDNS_STATUS_OK) {
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*result_size = ldns_buffer_position(buffer);
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result = (uint8_t *) ldns_buffer_export(buffer);
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} else {
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ldns_buffer_free(buffer);
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return status;
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}
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if (result) {
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*dest = LDNS_XMALLOC(uint8_t, ldns_buffer_position(buffer));
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if(!*dest) {
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ldns_buffer_free(buffer);
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return LDNS_STATUS_MEM_ERR;
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}
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memcpy(*dest, result, ldns_buffer_position(buffer));
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}
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ldns_buffer_free(buffer);
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return status;
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}
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ldns_status
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ldns_rr2wire(uint8_t **dest, const ldns_rr *rr, int section, size_t *result_size)
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{
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ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
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uint8_t *result = NULL;
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ldns_status status;
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*result_size = 0;
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*dest = NULL;
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if(!buffer) return LDNS_STATUS_MEM_ERR;
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status = ldns_rr2buffer_wire(buffer, rr, section);
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if (status == LDNS_STATUS_OK) {
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*result_size = ldns_buffer_position(buffer);
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result = (uint8_t *) ldns_buffer_export(buffer);
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} else {
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ldns_buffer_free(buffer);
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return status;
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}
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if (result) {
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*dest = LDNS_XMALLOC(uint8_t, ldns_buffer_position(buffer));
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if(!*dest) {
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ldns_buffer_free(buffer);
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return LDNS_STATUS_MEM_ERR;
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}
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memcpy(*dest, result, ldns_buffer_position(buffer));
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}
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ldns_buffer_free(buffer);
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return status;
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}
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ldns_status
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ldns_pkt2wire(uint8_t **dest, const ldns_pkt *packet, size_t *result_size)
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{
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ldns_buffer *buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
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uint8_t *result = NULL;
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ldns_status status;
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*result_size = 0;
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*dest = NULL;
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if(!buffer) return LDNS_STATUS_MEM_ERR;
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status = ldns_pkt2buffer_wire(buffer, packet);
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if (status == LDNS_STATUS_OK) {
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*result_size = ldns_buffer_position(buffer);
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result = (uint8_t *) ldns_buffer_export(buffer);
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} else {
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ldns_buffer_free(buffer);
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return status;
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}
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if (result) {
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*dest = LDNS_XMALLOC(uint8_t, ldns_buffer_position(buffer));
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if(!*dest) {
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ldns_buffer_free(buffer);
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return LDNS_STATUS_MEM_ERR;
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}
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memcpy(*dest, result, ldns_buffer_position(buffer));
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}
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ldns_buffer_free(buffer);
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return status;
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}
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