+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include "resolved-dns-answer.h"
-#include "resolved-dns-domain.h"
-
-DnsAnswer *dns_answer_new(unsigned n) {
- DnsAnswer *a;
-
- assert(n > 0);
-
- a = malloc0(offsetof(DnsAnswer, rrs) + sizeof(DnsResourceRecord*) * n);
- if (!a)
- return NULL;
-
- a->n_ref = 1;
- a->n_allocated = n;
-
- return a;
-}
-
-DnsAnswer *dns_answer_ref(DnsAnswer *a) {
- if (!a)
- return NULL;
-
- assert(a->n_ref > 0);
- a->n_ref++;
- return a;
-}
-
-DnsAnswer *dns_answer_unref(DnsAnswer *a) {
- if (!a)
- return NULL;
-
- assert(a->n_ref > 0);
-
- if (a->n_ref == 1) {
- unsigned i;
-
- for (i = 0; i < a->n_rrs; i++)
- dns_resource_record_unref(a->rrs[i]);
-
- free(a);
- } else
- a->n_ref--;
-
- return NULL;
-}
-
-int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr) {
- unsigned i;
- int r;
-
- assert(a);
- assert(rr);
-
- for (i = 0; i < a->n_rrs; i++) {
- r = dns_resource_record_equal(a->rrs[i], rr);
- if (r < 0)
- return r;
- if (r > 0) {
- /* Entry already exists, keep the entry with
- * the higher RR, or the one with TTL 0 */
-
- if (rr->ttl == 0 || (rr->ttl > a->rrs[i]->ttl && a->rrs[i]->ttl != 0)) {
- dns_resource_record_ref(rr);
- dns_resource_record_unref(a->rrs[i]);
- a->rrs[i] = rr;
- }
-
- return 0;
- }
- }
-
- if (a->n_rrs >= a->n_allocated)
- return -ENOSPC;
-
- a->rrs[a->n_rrs++] = dns_resource_record_ref(rr);
- return 1;
-}
-
-int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
- _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *soa = NULL;
-
- soa = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SOA, name);
- if (!soa)
- return -ENOMEM;
-
- soa->ttl = ttl;
-
- soa->soa.mname = strdup(name);
- if (!soa->soa.mname)
- return -ENOMEM;
-
- soa->soa.rname = strappend("root.", name);
- if (!soa->soa.rname)
- return -ENOMEM;
-
- soa->soa.serial = 1;
- soa->soa.refresh = 1;
- soa->soa.retry = 1;
- soa->soa.expire = 1;
- soa->soa.minimum = ttl;
-
- return dns_answer_add(a, soa);
-}
-
-int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
- unsigned i;
- int r;
-
- assert(a);
- assert(key);
-
- for (i = 0; i < a->n_rrs; i++) {
- r = dns_resource_key_match_rr(key, a->rrs[i]);
- if (r < 0)
- return r;
- if (r > 0)
- return 1;
- }
-
- return 0;
-}
-
-int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret) {
- unsigned i;
-
- assert(a);
- assert(key);
- assert(ret);
-
- /* For a SOA record we can never find a matching SOA record */
- if (key->type == DNS_TYPE_SOA)
- return 0;
-
- for (i = 0; i < a->n_rrs; i++) {
-
- if (a->rrs[i]->key->class != DNS_CLASS_IN)
- continue;
-
- if (a->rrs[i]->key->type != DNS_TYPE_SOA)
- continue;
-
- if (dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(a->rrs[i]->key))) {
- *ret = a->rrs[i];
- return 1;
- }
- }
-
- return 0;
-}
-
-DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b) {
- _cleanup_(dns_answer_unrefp) DnsAnswer *ret = NULL;
- DnsAnswer *k;
- unsigned i;
- int r;
-
- if (a && (!b || b->n_rrs <= 0))
- return dns_answer_ref(a);
- if ((!a || a->n_rrs <= 0) && b)
- return dns_answer_ref(b);
-
- ret = dns_answer_new((a ? a->n_rrs : 0) + (b ? b->n_rrs : 0));
- if (!ret)
- return NULL;
-
- if (a) {
- for (i = 0; i < a->n_rrs; i++) {
- r = dns_answer_add(ret, a->rrs[i]);
- if (r < 0)
- return NULL;
- }
- }
-
- if (b) {
- for (i = 0; i < b->n_rrs; i++) {
- r = dns_answer_add(ret, b->rrs[i]);
- if (r < 0)
- return NULL;
- }
- }
-
- k = ret;
- ret = NULL;
-
- return k;
-}
-
-void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
- DnsResourceRecord **rrs;
- unsigned i, start, end;
- assert(a);
-
- if (a->n_rrs <= 1)
- return;
-
- start = 0;
- end = a->n_rrs-1;
-
- /* RFC 4795, Section 2.6 suggests we should order entries
- * depending on whether the sender is a link-local address. */
-
- rrs = newa(DnsResourceRecord*, a->n_rrs);
- for (i = 0; i < a->n_rrs; i++) {
-
- if (a->rrs[i]->key->class == DNS_CLASS_IN &&
- ((a->rrs[i]->key->type == DNS_TYPE_A && in_addr_is_link_local(AF_INET, (union in_addr_union*) &a->rrs[i]->a.in_addr) != prefer_link_local) ||
- (a->rrs[i]->key->type == DNS_TYPE_AAAA && in_addr_is_link_local(AF_INET6, (union in_addr_union*) &a->rrs[i]->aaaa.in6_addr) != prefer_link_local)))
- /* Order address records that are are not preferred to the end of the array */
- rrs[end--] = a->rrs[i];
- else
- /* Order all other records to the beginning of the array */
- rrs[start++] = a->rrs[i];
- }
-
- assert(start == end+1);
- memcpy(a->rrs, rrs, sizeof(DnsResourceRecord*) * a->n_rrs);
-}
~ianmdlvl / elogind.git / blobdiff