freebsd-dev/contrib/ldns/host2wire.c

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2012-07-04 14:22:28 +00:00
/*
* 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>
ldns_status
ldns_dname2buffer_wire(ldns_buffer *buffer, const ldns_rdf *name)
{
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return ldns_dname2buffer_wire_compress(buffer, name, NULL);
}
ldns_status
ldns_dname2buffer_wire_compress(ldns_buffer *buffer, const ldns_rdf *name, ldns_rbtree_t *compression_data)
{
ldns_rbnode_t *node;
uint8_t *data;
size_t size;
ldns_rdf *label;
ldns_rdf *rest;
ldns_status s;
/* If no tree, just add the data */
if(!compression_data)
{
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);
}
/* No labels left, write final zero */
if(ldns_dname_label_count(name)==0)
{
if(ldns_buffer_reserve(buffer,1))
{
ldns_buffer_write_u8(buffer, 0);
}
return ldns_buffer_status(buffer);
}
/* Can we find the name in the tree? */
if((node = ldns_rbtree_search(compression_data, name)) != NULL)
{
/* Found */
uint16_t position = (uint16_t) (intptr_t) node->data | 0xC000;
if (ldns_buffer_reserve(buffer, 2))
{
ldns_buffer_write_u16(buffer, position);
}
return ldns_buffer_status(buffer);
}
else
{
/* Not found. Write cache entry, take off first label, write it, */
/* try again with the rest of the name. */
node = LDNS_MALLOC(ldns_rbnode_t);
if(!node)
{
return LDNS_STATUS_MEM_ERR;
}
if (ldns_buffer_position(buffer) < 16384) {
node->key = ldns_rdf_clone(name);
node->data = (void *) (intptr_t) ldns_buffer_position(buffer);
if(!ldns_rbtree_insert(compression_data,node))
{
/* fprintf(stderr,"Name not found but now it's there?\n"); */
}
}
label = ldns_dname_label(name, 0);
rest = ldns_dname_left_chop(name);
size = ldns_rdf_size(label) - 1; /* Don't want the final zero */
data = ldns_rdf_data(label);
if(ldns_buffer_reserve(buffer, size))
{
ldns_buffer_write(buffer, data, size);
}
ldns_rdf_deep_free(label);
s = ldns_dname2buffer_wire_compress(buffer, rest, compression_data);
ldns_rdf_deep_free(rest);
return s;
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}
}
ldns_status
ldns_rdf2buffer_wire(ldns_buffer *buffer, const ldns_rdf *rdf)
{
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return ldns_rdf2buffer_wire_compress(buffer, rdf, NULL);
}
ldns_status
ldns_rdf2buffer_wire_compress(ldns_buffer *buffer, const ldns_rdf *rdf, ldns_rbtree_t *compression_data)
{
/* If it's a DNAME, call that function to get compression */
if(compression_data && ldns_rdf_get_type(rdf) == LDNS_RDF_TYPE_DNAME)
{
return ldns_dname2buffer_wire_compress(buffer,rdf,compression_data);
}
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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);
}
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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(
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buffer, ldns_rr_rdf(rr, i));
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} else {
(void) ldns_rdf2buffer_wire(
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buffer, ldns_rr_rdf(rr, i));
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}
}
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)
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{
return ldns_rr2buffer_wire_compress(buffer,rr,section,NULL);
}
ldns_status
ldns_rr2buffer_wire_compress(ldns_buffer *buffer, const ldns_rr *rr, int section, ldns_rbtree_t *compression_data)
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{
uint16_t i;
uint16_t rdl_pos = 0;
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if (ldns_rr_owner(rr)) {
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(void) ldns_dname2buffer_wire_compress(buffer, ldns_rr_owner(rr), compression_data);
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}
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);
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}
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if (LDNS_RR_COMPRESS ==
ldns_rr_descript(ldns_rr_get_type(rr))->_compress) {
for (i = 0; i < ldns_rr_rd_count(rr); i++) {
(void) ldns_rdf2buffer_wire_compress(buffer,
ldns_rr_rdf(rr, i), compression_data);
}
} else {
for (i = 0; i < ldns_rr_rd_count(rr); i++) {
(void) ldns_rdf2buffer_wire(
buffer, ldns_rr_rdf(rr, i));
}
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}
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++) {
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(void) ldns_rdf2buffer_wire_canonical(buffer,
ldns_rr_rdf(rr, i));
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}
return ldns_buffer_status(buffer);
}
ldns_status
ldns_rr_rdata2buffer_wire(ldns_buffer *buffer, const ldns_rr *rr)
{
uint16_t i;
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/* convert all the rdf's */
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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}
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;
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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
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| ldns_pkt_cd(packet) << 4
| ldns_pkt_get_rcode(packet);
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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);
}
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static void
compression_node_free(ldns_rbnode_t *node, void *arg)
{
(void)arg; /* Yes, dear compiler, it is used */
ldns_rdf_deep_free((ldns_rdf *)node->key);
LDNS_FREE(node);
}
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ldns_status
ldns_pkt2buffer_wire(ldns_buffer *buffer, const ldns_pkt *packet)
{
ldns_rr_list *rr_list;
uint16_t i;
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/* edns tmp vars */
ldns_rr *edns_rr;
uint8_t edata[4];
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ldns_rbtree_t *compression_data = ldns_rbtree_create((int (*)(const void *, const void *))ldns_dname_compare);
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(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++) {
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(void) ldns_rr2buffer_wire_compress(buffer,
ldns_rr_list_rr(rr_list, i), LDNS_SECTION_QUESTION, compression_data);
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}
}
rr_list = ldns_pkt_answer(packet);
if (rr_list) {
for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire_compress(buffer,
ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ANSWER, compression_data);
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}
}
rr_list = ldns_pkt_authority(packet);
if (rr_list) {
for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire_compress(buffer,
ldns_rr_list_rr(rr_list, i), LDNS_SECTION_AUTHORITY, compression_data);
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}
}
rr_list = ldns_pkt_additional(packet);
if (rr_list) {
for (i = 0; i < ldns_rr_list_rr_count(rr_list); i++) {
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(void) ldns_rr2buffer_wire_compress(buffer,
ldns_rr_list_rr(rr_list, i), LDNS_SECTION_ADDITIONAL, compression_data);
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}
}
/* 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);
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(void)ldns_rr2buffer_wire_compress(buffer, edns_rr, LDNS_SECTION_ADDITIONAL, compression_data);
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/* 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)) {
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(void) ldns_rr2buffer_wire_compress(buffer,
ldns_pkt_tsig(packet), LDNS_SECTION_ADDITIONAL, compression_data);
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}
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ldns_traverse_postorder(compression_data,compression_node_free,NULL);
ldns_rbtree_free(compression_data);
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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);
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*dest = (uint8_t *) ldns_buffer_export(buffer);
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}
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);
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*dest = (uint8_t *) ldns_buffer_export(buffer);
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}
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);
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*dest = (uint8_t *) ldns_buffer_export(buffer);
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}
ldns_buffer_free(buffer);
return status;
}