435 lines
8.9 KiB
C
435 lines
8.9 KiB
C
/* zone.c
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*
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* Functions for ldns_zone structure
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* a Net::DNS like library for C
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*
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* (c) NLnet Labs, 2005-2006
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* See the file LICENSE for the license
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*/
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#include <ldns/config.h>
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#include <ldns/ldns.h>
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#ifdef _MSC_VER
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#include <string.h>
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#else
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#include <strings.h>
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#endif
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#include <limits.h>
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ldns_rr *
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ldns_zone_soa(const ldns_zone *z)
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{
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return z->_soa;
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}
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size_t
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ldns_zone_rr_count(const ldns_zone *z)
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{
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return ldns_rr_list_rr_count(z->_rrs);
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}
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void
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ldns_zone_set_soa(ldns_zone *z, ldns_rr *soa)
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{
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z->_soa = soa;
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}
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ldns_rr_list *
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ldns_zone_rrs(const ldns_zone *z)
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{
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return z->_rrs;
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}
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void
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ldns_zone_set_rrs(ldns_zone *z, ldns_rr_list *rrlist)
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{
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z->_rrs = rrlist;
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}
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bool
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ldns_zone_push_rr_list(ldns_zone *z, ldns_rr_list *list)
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{
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return ldns_rr_list_cat(ldns_zone_rrs(z), list);
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}
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bool
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ldns_zone_push_rr(ldns_zone *z, ldns_rr *rr)
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{
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return ldns_rr_list_push_rr( ldns_zone_rrs(z), rr);
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}
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/* return a clone of the given rr list, without the glue records
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* rr list should be the complete zone
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* if present, stripped records are added to the list *glue_records
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*/
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ldns_rr_list *
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ldns_zone_strip_glue_rrs(const ldns_rdf *zone_name, const ldns_rr_list *rrs, ldns_rr_list *glue_rrs)
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{
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ldns_rr_list *new_list;
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/* when do we find glue? It means we find an IP address
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* (AAAA/A) for a nameserver listed in the zone
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*
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* Alg used here:
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* first find all the zonecuts (NS records)
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* find all the AAAA or A records (can be done it the
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* above loop).
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*
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* Check if the aaaa/a list are subdomains under the
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* NS domains.
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* If yes -> glue, if no -> not glue
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*/
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ldns_rr_list *zone_cuts;
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ldns_rr_list *addr;
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ldns_rr *r, *ns, *a;
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ldns_rdf *dname_a, *ns_owner;
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uint16_t i,j;
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new_list = NULL;
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zone_cuts = NULL;
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addr = NULL;
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new_list = ldns_rr_list_new();
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if (!new_list) goto memory_error;
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zone_cuts = ldns_rr_list_new();
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if (!zone_cuts) goto memory_error;
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addr = ldns_rr_list_new();
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if (!addr) goto memory_error;
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for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
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r = ldns_rr_list_rr(rrs, i);
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if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A ||
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ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) {
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/* possibly glue */
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if (!ldns_rr_list_push_rr(addr, r)) goto memory_error;
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continue;
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}
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if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) {
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/* multiple zones will end up here -
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* for now; not a problem
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*/
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/* don't add NS records for the current zone itself */
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if (ldns_rdf_compare(ldns_rr_owner(r),
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zone_name) != 0) {
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if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error;
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}
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continue;
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}
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}
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/* will sorting make it quicker ?? */
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for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) {
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ns = ldns_rr_list_rr(zone_cuts, i);
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ns_owner = ldns_rr_owner(ns);
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for(j = 0; j < ldns_rr_list_rr_count(addr); j++) {
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a = ldns_rr_list_rr(addr, j);
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dname_a = ldns_rr_owner(a);
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if (ldns_dname_is_subdomain(dname_a, ns_owner)) {
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/* GLUE! */
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if (glue_rrs) {
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if (!ldns_rr_list_push_rr(glue_rrs, a)) goto memory_error;
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}
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break;
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} else {
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if (!ldns_rr_list_push_rr(new_list, a)) goto memory_error;
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}
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}
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}
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ldns_rr_list_free(addr);
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ldns_rr_list_free(zone_cuts);
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return new_list;
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memory_error:
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if (new_list) {
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ldns_rr_list_free(new_list);
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}
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if (zone_cuts) {
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ldns_rr_list_free(zone_cuts);
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}
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if (addr) {
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ldns_rr_list_free(addr);
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}
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return NULL;
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}
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/*
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* Get the list of glue records in a zone
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* XXX: there should be a way for this to return error, other than NULL,
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* since NULL is a valid return
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*/
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ldns_rr_list *
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ldns_zone_glue_rr_list(const ldns_zone *z)
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{
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/* when do we find glue? It means we find an IP address
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* (AAAA/A) for a nameserver listed in the zone
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*
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* Alg used here:
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* first find all the zonecuts (NS records)
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* find all the AAAA or A records (can be done it the
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* above loop).
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*
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* Check if the aaaa/a list are subdomains under the
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* NS domains.
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* If yes -> glue, if no -> not glue
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*/
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ldns_rr_list *zone_cuts;
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ldns_rr_list *addr;
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ldns_rr_list *glue;
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ldns_rr *r, *ns, *a;
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ldns_rdf *dname_a, *ns_owner;
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size_t i,j;
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zone_cuts = NULL;
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addr = NULL;
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glue = NULL;
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/* we cannot determine glue in a 'zone' without a SOA */
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if (!ldns_zone_soa(z)) {
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return NULL;
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}
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zone_cuts = ldns_rr_list_new();
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if (!zone_cuts) goto memory_error;
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addr = ldns_rr_list_new();
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if (!addr) goto memory_error;
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glue = ldns_rr_list_new();
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if (!glue) goto memory_error;
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for(i = 0; i < ldns_zone_rr_count(z); i++) {
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r = ldns_rr_list_rr(ldns_zone_rrs(z), i);
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if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A ||
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ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) {
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/* possibly glue */
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if (!ldns_rr_list_push_rr(addr, r)) goto memory_error;
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continue;
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}
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if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) {
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/* multiple zones will end up here -
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* for now; not a problem
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*/
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/* don't add NS records for the current zone itself */
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if (ldns_rdf_compare(ldns_rr_owner(r),
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ldns_rr_owner(ldns_zone_soa(z))) != 0) {
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if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error;
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}
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continue;
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}
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}
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/* will sorting make it quicker ?? */
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for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) {
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ns = ldns_rr_list_rr(zone_cuts, i);
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ns_owner = ldns_rr_owner(ns);
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for(j = 0; j < ldns_rr_list_rr_count(addr); j++) {
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a = ldns_rr_list_rr(addr, j);
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dname_a = ldns_rr_owner(a);
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if (ldns_dname_is_subdomain(dname_a, ns_owner)) {
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/* GLUE! */
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if (!ldns_rr_list_push_rr(glue, a)) goto memory_error;
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}
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}
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}
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ldns_rr_list_free(addr);
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ldns_rr_list_free(zone_cuts);
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if (ldns_rr_list_rr_count(glue) == 0) {
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ldns_rr_list_free(glue);
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return NULL;
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} else {
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return glue;
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}
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memory_error:
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if (zone_cuts) {
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LDNS_FREE(zone_cuts);
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}
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if (addr) {
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ldns_rr_list_free(addr);
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}
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if (glue) {
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ldns_rr_list_free(glue);
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}
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return NULL;
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}
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ldns_zone *
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ldns_zone_new(void)
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{
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ldns_zone *z;
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z = LDNS_MALLOC(ldns_zone);
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if (!z) {
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return NULL;
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}
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z->_rrs = ldns_rr_list_new();
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if (!z->_rrs) {
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LDNS_FREE(z);
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return NULL;
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}
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ldns_zone_set_soa(z, NULL);
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return z;
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}
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/* we regocnize:
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* $TTL, $ORIGIN
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*/
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ldns_status
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ldns_zone_new_frm_fp(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl, ldns_rr_class c)
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{
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return ldns_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL);
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}
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/* XXX: class is never used */
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ldns_status
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ldns_zone_new_frm_fp_l(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl,
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ldns_rr_class ATTR_UNUSED(c), int *line_nr)
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{
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ldns_zone *newzone;
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ldns_rr *rr;
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uint32_t my_ttl;
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ldns_rdf *my_origin;
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ldns_rdf *my_prev;
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bool soa_seen = false; /* 2 soa are an error */
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ldns_status s;
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ldns_status ret;
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/* most cases of error are memory problems */
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ret = LDNS_STATUS_MEM_ERR;
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newzone = NULL;
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my_origin = NULL;
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my_prev = NULL;
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my_ttl = ttl;
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if (origin) {
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my_origin = ldns_rdf_clone(origin);
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if (!my_origin) goto error;
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/* also set the prev */
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my_prev = ldns_rdf_clone(origin);
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if (!my_prev) goto error;
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}
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newzone = ldns_zone_new();
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if (!newzone) goto error;
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while(!feof(fp)) {
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s = ldns_rr_new_frm_fp_l(&rr, fp, &my_ttl, &my_origin, &my_prev, line_nr);
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switch (s) {
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case LDNS_STATUS_OK:
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if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) {
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if (soa_seen) {
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/* second SOA
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* just skip, maybe we want to say
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* something??? */
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ldns_rr_free(rr);
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continue;
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}
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soa_seen = true;
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ldns_zone_set_soa(newzone, rr);
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/* set origin to soa if not specified */
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if (!my_origin) {
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my_origin = ldns_rdf_clone(ldns_rr_owner(rr));
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}
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continue;
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}
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/* a normal RR - as sofar the DNS is normal */
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if (!ldns_zone_push_rr(newzone, rr)) goto error;
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case LDNS_STATUS_SYNTAX_EMPTY:
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/* empty line was seen */
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case LDNS_STATUS_SYNTAX_TTL:
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/* the function set the ttl */
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break;
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case LDNS_STATUS_SYNTAX_ORIGIN:
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/* the function set the origin */
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break;
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case LDNS_STATUS_SYNTAX_INCLUDE:
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ret = LDNS_STATUS_SYNTAX_INCLUDE_ERR_NOTIMPL;
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break;
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default:
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ret = s;
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goto error;
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}
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}
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if (my_origin) {
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ldns_rdf_deep_free(my_origin);
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}
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if (my_prev) {
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ldns_rdf_deep_free(my_prev);
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}
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if (z) {
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*z = newzone;
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} else {
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ldns_zone_free(newzone);
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}
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return LDNS_STATUS_OK;
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error:
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if (my_origin) {
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ldns_rdf_deep_free(my_origin);
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}
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if (my_prev) {
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ldns_rdf_deep_free(my_prev);
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}
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if (newzone) {
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ldns_zone_free(newzone);
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}
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return ret;
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}
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void
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ldns_zone_sort(ldns_zone *zone)
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{
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ldns_rr_list *zrr;
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assert(zone != NULL);
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zrr = ldns_zone_rrs(zone);
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ldns_rr_list_sort(zrr);
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}
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#if 0
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/**
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* ixfr function. Work on a ldns_zone and remove and add
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* the rrs from the rrlist
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* \param[in] z the zone to work on
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* \param[in] del rr_list to remove from the zone
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* \param[in] add rr_list to add to the zone
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* \return Tja, wat zouden we eens returnen TODO
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*/
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void
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ldns_zone_ixfr_del_add(ldns_zone *z, ldns_rr_list *del, ldns_rr_list *add)
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{
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}
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#endif
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void
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ldns_zone_free(ldns_zone *zone)
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{
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ldns_rr_list_free(zone->_rrs);
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LDNS_FREE(zone);
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}
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void
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ldns_zone_deep_free(ldns_zone *zone)
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{
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ldns_rr_free(zone->_soa);
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ldns_rr_list_deep_free(zone->_rrs);
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LDNS_FREE(zone);
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}
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