319 lines
6.2 KiB
C
319 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, 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, 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, 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);
|
|
}
|