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/*
* rr_function.c
*
* function that operate on specific rr types
*
* (c) NLnet Labs, 2004-2006
* See the file LICENSE for the license
*/
/*
* These come strait from perldoc Net::DNS::RR::xxx
* first the read variant, then the write. This is
* not complete.
*/
#include <ldns/config.h>
#include <ldns/ldns.h>
#include <limits.h>
#include <strings.h>
/**
* return a specific rdf
* \param[in] type type of RR
* \param[in] rr the rr itself
* \param[in] pos at which postion to get it
* \return the rdf sought
*/
static ldns_rdf *
ldns_rr_function(ldns_rr_type type, const ldns_rr *rr, size_t pos)
{
if (!rr || ldns_rr_get_type(rr) != type) {
return NULL;
}
return ldns_rr_rdf(rr, pos);
}
/**
* set a specific rdf
* \param[in] type type of RR
* \param[in] rr the rr itself
* \param[in] rdf the rdf to set
* \param[in] pos at which postion to set it
* \return true or false
*/
static bool
ldns_rr_set_function(ldns_rr_type type, ldns_rr *rr, ldns_rdf *rdf, size_t pos)
{
ldns_rdf *pop;
if (!rr || ldns_rr_get_type(rr) != type) {
return false;
}
pop = ldns_rr_set_rdf(rr, rdf, pos);
ldns_rdf_deep_free(pop);
return true;
}
/* A/AAAA records */
ldns_rdf *
ldns_rr_a_address(const ldns_rr *r)
{
/* 2 types to check, cannot use the macro */
if (!r || (ldns_rr_get_type(r) != LDNS_RR_TYPE_A &&
ldns_rr_get_type(r) != LDNS_RR_TYPE_AAAA)) {
return NULL;
}
return ldns_rr_rdf(r, 0);
}
bool
ldns_rr_a_set_address(ldns_rr *r, ldns_rdf *f)
{
/* 2 types to check, cannot use the macro... */
ldns_rdf *pop;
if (!r || (ldns_rr_get_type(r) != LDNS_RR_TYPE_A &&
ldns_rr_get_type(r) != LDNS_RR_TYPE_AAAA)) {
return false;
}
pop = ldns_rr_set_rdf(r, f, 0);
if (pop) {
LDNS_FREE(pop);
return true;
} else {
return false;
}
}
/* NS record */
ldns_rdf *
ldns_rr_ns_nsdname(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_NS, r, 0);
}
/* MX record */
ldns_rdf *
ldns_rr_mx_preference(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_MX, r, 0);
}
ldns_rdf *
ldns_rr_mx_exchange(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_MX, r, 1);
}
/* RRSIG record */
ldns_rdf *
ldns_rr_rrsig_typecovered(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 0);
}
bool
ldns_rr_rrsig_set_typecovered(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 0);
}
ldns_rdf *
ldns_rr_rrsig_algorithm(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 1);
}
bool
ldns_rr_rrsig_set_algorithm(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 1);
}
ldns_rdf *
ldns_rr_rrsig_labels(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 2);
}
bool
ldns_rr_rrsig_set_labels(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 2);
}
ldns_rdf *
ldns_rr_rrsig_origttl(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 3);
}
bool
ldns_rr_rrsig_set_origttl(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 3);
}
ldns_rdf *
ldns_rr_rrsig_expiration(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 4);
}
bool
ldns_rr_rrsig_set_expiration(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 4);
}
ldns_rdf *
ldns_rr_rrsig_inception(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 5);
}
bool
ldns_rr_rrsig_set_inception(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 5);
}
ldns_rdf *
ldns_rr_rrsig_keytag(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 6);
}
bool
ldns_rr_rrsig_set_keytag(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 6);
}
ldns_rdf *
ldns_rr_rrsig_signame(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 7);
}
bool
ldns_rr_rrsig_set_signame(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 7);
}
ldns_rdf *
ldns_rr_rrsig_sig(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_RRSIG, r, 8);
}
bool
ldns_rr_rrsig_set_sig(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_RRSIG, r, f, 8);
}
/* DNSKEY record */
ldns_rdf *
ldns_rr_dnskey_flags(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_DNSKEY, r, 0);
}
bool
ldns_rr_dnskey_set_flags(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_DNSKEY, r, f, 0);
}
ldns_rdf *
ldns_rr_dnskey_protocol(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_DNSKEY, r, 1);
}
bool
ldns_rr_dnskey_set_protocol(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_DNSKEY, r, f, 1);
}
ldns_rdf *
ldns_rr_dnskey_algorithm(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_DNSKEY, r, 2);
}
bool
ldns_rr_dnskey_set_algorithm(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_DNSKEY, r, f, 2);
}
ldns_rdf *
ldns_rr_dnskey_key(const ldns_rr *r)
{
return ldns_rr_function(LDNS_RR_TYPE_DNSKEY, r, 3);
}
bool
ldns_rr_dnskey_set_key(ldns_rr *r, ldns_rdf *f)
{
return ldns_rr_set_function(LDNS_RR_TYPE_DNSKEY, r, f, 3);
}
size_t
ldns_rr_dnskey_key_size_raw(const unsigned char* keydata,
const size_t len,
const ldns_algorithm alg)
{
/* for DSA keys */
uint8_t t;
/* for RSA keys */
uint16_t exp;
uint16_t int16;
switch ((ldns_signing_algorithm)alg) {
case LDNS_SIGN_DSA:
case LDNS_SIGN_DSA_NSEC3:
if (len > 0) {
t = keydata[0];
return (64 + t*8)*8;
} else {
return 0;
}
break;
case LDNS_SIGN_RSAMD5:
case LDNS_SIGN_RSASHA1:
case LDNS_SIGN_RSASHA1_NSEC3:
#ifdef USE_SHA2
case LDNS_SIGN_RSASHA256:
case LDNS_SIGN_RSASHA512:
#endif
if (len > 0) {
if (keydata[0] == 0) {
/* big exponent */
if (len > 3) {
memmove(&int16, keydata + 1, 2);
exp = ntohs(int16);
return (len - exp - 3)*8;
} else {
return 0;
}
} else {
exp = keydata[0];
return (len-exp-1)*8;
}
} else {
return 0;
}
break;
#ifdef USE_GOST
case LDNS_SIGN_ECC_GOST:
return 512;
#endif
#ifdef USE_ECDSA
case LDNS_SIGN_ECDSAP256SHA256:
return 256;
case LDNS_SIGN_ECDSAP384SHA384:
return 384;
#endif
#ifdef USE_ED25519
case LDNS_SIGN_ED25519:
return 256;
#endif
#ifdef USE_ED448
case LDNS_SIGN_ED448:
return 456;
#endif
case LDNS_SIGN_HMACMD5:
return len;
default:
return 0;
}
}
size_t
ldns_rr_dnskey_key_size(const ldns_rr *key)
{
if (!key || !ldns_rr_dnskey_key(key)
|| !ldns_rr_dnskey_algorithm(key)) {
return 0;
}
return ldns_rr_dnskey_key_size_raw((unsigned char*)ldns_rdf_data(ldns_rr_dnskey_key(key)),
ldns_rdf_size(ldns_rr_dnskey_key(key)),
ldns_rdf2native_int8(ldns_rr_dnskey_algorithm(key))
);
}
uint32_t ldns_soa_serial_identity(uint32_t ATTR_UNUSED(unused), void *data)
{
return (uint32_t) (intptr_t) data;
}
uint32_t ldns_soa_serial_increment(uint32_t s, void *ATTR_UNUSED(unused))
{
return ldns_soa_serial_increment_by(s, (void *)1);
}
uint32_t ldns_soa_serial_increment_by(uint32_t s, void *data)
{
return s + (intptr_t) data;
}
uint32_t ldns_soa_serial_datecounter(uint32_t s, void *data)
{
struct tm tm;
char s_str[11];
int32_t new_s;
time_t t = data ? (time_t) (intptr_t) data : ldns_time(NULL);
(void) strftime(s_str, 11, "%Y%m%d00", localtime_r(&t, &tm));
new_s = (int32_t) atoi(s_str);
return new_s - ((int32_t) s) <= 0 ? s+1 : ((uint32_t) new_s);
}
uint32_t ldns_soa_serial_unixtime(uint32_t s, void *data)
{
int32_t new_s = data ? (int32_t) (intptr_t) data
: (int32_t) ldns_time(NULL);
return new_s - ((int32_t) s) <= 0 ? s+1 : ((uint32_t) new_s);
}
void
ldns_rr_soa_increment(ldns_rr *soa)
{
ldns_rr_soa_increment_func_data(soa, ldns_soa_serial_increment, NULL);
}
void
ldns_rr_soa_increment_func(ldns_rr *soa, ldns_soa_serial_increment_func_t f)
{
ldns_rr_soa_increment_func_data(soa, f, NULL);
}
void
ldns_rr_soa_increment_func_data(ldns_rr *soa,
ldns_soa_serial_increment_func_t f, void *data)
{
ldns_rdf *prev_soa_serial_rdf;
if ( !soa || !f || ldns_rr_get_type(soa) != LDNS_RR_TYPE_SOA
|| !ldns_rr_rdf(soa, 2)) {
return;
}
prev_soa_serial_rdf = ldns_rr_set_rdf(
soa
, ldns_native2rdf_int32(
LDNS_RDF_TYPE_INT32
, (*f)( ldns_rdf2native_int32(
ldns_rr_rdf(soa, 2))
, data
)
)
, 2
);
LDNS_FREE(prev_soa_serial_rdf);
}
void
ldns_rr_soa_increment_func_int(ldns_rr *soa,
ldns_soa_serial_increment_func_t f, int data)
{
ldns_rr_soa_increment_func_data(soa, f, (void *) (intptr_t) data);
}
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