99 lines
4.1 KiB
C
99 lines
4.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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typedef struct DnsAnswer DnsAnswer;
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typedef struct DnsAnswerItem DnsAnswerItem;
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#include "macro.h"
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#include "resolved-dns-rr.h"
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/* A simple array of resource records. We keep track of the
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* originating ifindex for each RR where that makes sense, so that we
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* can qualify A and AAAA RRs referring to a local link with the
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* right ifindex.
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*
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* Note that we usually encode the empty answer as a simple NULL. */
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struct DnsAnswerItem {
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DnsResourceRecord *rr;
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int ifindex;
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};
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struct DnsAnswer {
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unsigned n_ref;
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unsigned n_rrs, n_allocated;
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DnsAnswerItem items[0];
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};
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DnsAnswer *dns_answer_new(unsigned n);
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DnsAnswer *dns_answer_ref(DnsAnswer *a);
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DnsAnswer *dns_answer_unref(DnsAnswer *a);
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int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex);
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int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex);
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int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl);
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int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key);
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int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr);
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int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
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int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
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int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
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int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
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void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local);
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int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
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int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
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int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
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int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key);
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static inline unsigned dns_answer_size(DnsAnswer *a) {
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return a ? a->n_rrs : 0;
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
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#define _DNS_ANSWER_FOREACH(q, kk, a) \
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for (unsigned UNIQ_T(i, q) = ({ \
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(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
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0; \
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}); \
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(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
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UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL))
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#define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
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#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \
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for (unsigned UNIQ_T(i, q) = ({ \
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(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
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(ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
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0; \
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}); \
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(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
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UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
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#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)
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