freebsd-skq/contrib/ldns/zone.c
Dag-Erling Smørgrav 986ba33c7a Upgrade LDNS to 1.7.0.
I've been holding back on this because 1.7.0 requires OpenSSL 1.1.0 or
newer for full DANE support.  But we can't wait forever, and nothing in
base uses DANE anyway, so here we go.
2018-05-12 12:00:18 +00:00

318 lines
6.2 KiB
C

/* zone.c
*
* Functions for ldns_zone structure
* a Net::DNS like library for C
*
* (c) NLnet Labs, 2005-2006
* See the file LICENSE for the license
*/
#include <ldns/config.h>
#include <ldns/ldns.h>
#include <strings.h>
#include <limits.h>
ldns_rr *
ldns_zone_soa(const ldns_zone *z)
{
return z->_soa;
}
size_t
ldns_zone_rr_count(const ldns_zone *z)
{
return ldns_rr_list_rr_count(z->_rrs);
}
void
ldns_zone_set_soa(ldns_zone *z, ldns_rr *soa)
{
z->_soa = soa;
}
ldns_rr_list *
ldns_zone_rrs(const ldns_zone *z)
{
return z->_rrs;
}
void
ldns_zone_set_rrs(ldns_zone *z, ldns_rr_list *rrlist)
{
z->_rrs = rrlist;
}
bool
ldns_zone_push_rr_list(ldns_zone *z, const ldns_rr_list *list)
{
return ldns_rr_list_cat(ldns_zone_rrs(z), list);
}
bool
ldns_zone_push_rr(ldns_zone *z, ldns_rr *rr)
{
return ldns_rr_list_push_rr(ldns_zone_rrs(z), rr);
}
/*
* Get the list of glue records in a zone
* XXX: there should be a way for this to return error, other than NULL,
* since NULL is a valid return
*/
ldns_rr_list *
ldns_zone_glue_rr_list(const ldns_zone *z)
{
/* when do we find glue? It means we find an IP address
* (AAAA/A) for a nameserver listed in the zone
*
* Alg used here:
* first find all the zonecuts (NS records)
* find all the AAAA or A records (can be done it the
* above loop).
*
* Check if the aaaa/a list are subdomains under the
* NS domains.
* If yes -> glue, if no -> not glue
*/
ldns_rr_list *zone_cuts;
ldns_rr_list *addr;
ldns_rr_list *glue;
ldns_rr *r, *ns, *a;
ldns_rdf *dname_a, *ns_owner;
size_t i,j;
zone_cuts = NULL;
addr = NULL;
glue = NULL;
/* we cannot determine glue in a 'zone' without a SOA */
if (!ldns_zone_soa(z)) {
return NULL;
}
zone_cuts = ldns_rr_list_new();
if (!zone_cuts) goto memory_error;
addr = ldns_rr_list_new();
if (!addr) goto memory_error;
glue = ldns_rr_list_new();
if (!glue) goto memory_error;
for(i = 0; i < ldns_zone_rr_count(z); i++) {
r = ldns_rr_list_rr(ldns_zone_rrs(z), i);
if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A ||
ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) {
/* possibly glue */
if (!ldns_rr_list_push_rr(addr, r)) goto memory_error;
continue;
}
if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) {
/* multiple zones will end up here -
* for now; not a problem
*/
/* don't add NS records for the current zone itself */
if (ldns_rdf_compare(ldns_rr_owner(r),
ldns_rr_owner(ldns_zone_soa(z))) != 0) {
if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error;
}
continue;
}
}
/* will sorting make it quicker ?? */
for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) {
ns = ldns_rr_list_rr(zone_cuts, i);
ns_owner = ldns_rr_owner(ns);
for(j = 0; j < ldns_rr_list_rr_count(addr); j++) {
a = ldns_rr_list_rr(addr, j);
dname_a = ldns_rr_owner(a);
if (ldns_dname_is_subdomain(dname_a, ns_owner) ||
ldns_dname_compare(dname_a, ns_owner) == 0) {
/* GLUE! */
if (!ldns_rr_list_push_rr(glue, a)) goto memory_error;
}
}
}
ldns_rr_list_free(addr);
ldns_rr_list_free(zone_cuts);
if (ldns_rr_list_rr_count(glue) == 0) {
ldns_rr_list_free(glue);
return NULL;
} else {
return glue;
}
memory_error:
if (zone_cuts) {
LDNS_FREE(zone_cuts);
}
if (addr) {
ldns_rr_list_free(addr);
}
if (glue) {
ldns_rr_list_free(glue);
}
return NULL;
}
ldns_zone *
ldns_zone_new(void)
{
ldns_zone *z;
z = LDNS_MALLOC(ldns_zone);
if (!z) {
return NULL;
}
z->_rrs = ldns_rr_list_new();
if (!z->_rrs) {
LDNS_FREE(z);
return NULL;
}
ldns_zone_set_soa(z, NULL);
return z;
}
/* we regocnize:
* $TTL, $ORIGIN
*/
ldns_status
ldns_zone_new_frm_fp(ldns_zone **z, FILE *fp, const ldns_rdf *origin, uint32_t ttl, ldns_rr_class c)
{
return ldns_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL);
}
/* XXX: class is never used */
ldns_status
ldns_zone_new_frm_fp_l(ldns_zone **z, FILE *fp, const ldns_rdf *origin, uint32_t ttl,
ldns_rr_class ATTR_UNUSED(c), int *line_nr)
{
ldns_zone *newzone;
ldns_rr *rr;
uint32_t my_ttl;
ldns_rdf *my_origin;
ldns_rdf *my_prev;
bool soa_seen = false; /* 2 soa are an error */
ldns_status s;
ldns_status ret;
/* most cases of error are memory problems */
ret = LDNS_STATUS_MEM_ERR;
newzone = NULL;
my_origin = NULL;
my_prev = NULL;
my_ttl = ttl;
if (origin) {
my_origin = ldns_rdf_clone(origin);
if (!my_origin) goto error;
/* also set the prev */
my_prev = ldns_rdf_clone(origin);
if (!my_prev) goto error;
}
newzone = ldns_zone_new();
if (!newzone) goto error;
while(!feof(fp)) {
s = ldns_rr_new_frm_fp_l(&rr, fp, &my_ttl, &my_origin, &my_prev, line_nr);
switch (s) {
case LDNS_STATUS_OK:
if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) {
if (soa_seen) {
/* second SOA
* just skip, maybe we want to say
* something??? */
ldns_rr_free(rr);
continue;
}
soa_seen = true;
ldns_zone_set_soa(newzone, rr);
/* set origin to soa if not specified */
if (!my_origin) {
my_origin = ldns_rdf_clone(ldns_rr_owner(rr));
}
continue;
}
/* a normal RR - as sofar the DNS is normal */
if (!ldns_zone_push_rr(newzone, rr)) goto error;
case LDNS_STATUS_SYNTAX_EMPTY:
/* empty line was seen */
case LDNS_STATUS_SYNTAX_TTL:
/* the function set the ttl */
break;
case LDNS_STATUS_SYNTAX_ORIGIN:
/* the function set the origin */
break;
case LDNS_STATUS_SYNTAX_INCLUDE:
ret = LDNS_STATUS_SYNTAX_INCLUDE_ERR_NOTIMPL;
break;
default:
ret = s;
goto error;
}
}
if (my_origin) {
ldns_rdf_deep_free(my_origin);
}
if (my_prev) {
ldns_rdf_deep_free(my_prev);
}
if (z) {
*z = newzone;
} else {
ldns_zone_free(newzone);
}
return LDNS_STATUS_OK;
error:
if (my_origin) {
ldns_rdf_deep_free(my_origin);
}
if (my_prev) {
ldns_rdf_deep_free(my_prev);
}
if (newzone) {
ldns_zone_free(newzone);
}
return ret;
}
void
ldns_zone_sort(ldns_zone *zone)
{
ldns_rr_list *zrr;
assert(zone != NULL);
zrr = ldns_zone_rrs(zone);
ldns_rr_list_sort(zrr);
}
void
ldns_zone_free(ldns_zone *zone)
{
ldns_rr_list_free(zone->_rrs);
LDNS_FREE(zone);
}
void
ldns_zone_deep_free(ldns_zone *zone)
{
ldns_rr_free(zone->_soa);
ldns_rr_list_deep_free(zone->_rrs);
LDNS_FREE(zone);
}