freebsd-dev/contrib/ldns/zone.c

318 lines
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2012-07-04 14:22:28 +00:00
/* 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
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ldns_zone_push_rr_list(ldns_zone *z, const ldns_rr_list *list)
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{
return ldns_rr_list_cat(ldns_zone_rrs(z), list);
}
bool
ldns_zone_push_rr(ldns_zone *z, ldns_rr *rr)
{
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return ldns_rr_list_push_rr(ldns_zone_rrs(z), rr);
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}
/*
* 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
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ldns_zone_new_frm_fp(ldns_zone **z, FILE *fp, const ldns_rdf *origin, uint32_t ttl, ldns_rr_class c)
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{
return ldns_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL);
}
/* XXX: class is never used */
ldns_status
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ldns_zone_new_frm_fp_l(ldns_zone **z, FILE *fp, const ldns_rdf *origin, uint32_t ttl,
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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);
}