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#pragma once
/***
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/>.
***/
typedef struct DnsAnswer DnsAnswer;
typedef struct DnsAnswerItem DnsAnswerItem;
#include "macro.h"
#include "resolved-dns-rr.h"
/* A simple array of resource records. We keep track of the
* originating ifindex for each RR where that makes sense, so that we
* can qualify A and AAAA RRs referring to a local link with the
* right ifindex.
*
* Note that we usually encode the empty DnsAnswer object as a simple NULL. */
typedef enum DnsAnswerFlags {
DNS_ANSWER_AUTHENTICATED = 1, /* Item has been authenticated */
DNS_ANSWER_CACHEABLE = 2, /* Item is subject to caching */
DNS_ANSWER_SHARED_OWNER = 4, /* For mDNS: RRset may be owner by multiple peers */
DNS_ANSWER_CACHE_FLUSH = 8, /* For mDNS: sets cache-flush bit in the rrclass of response records */
DNS_ANSWER_GOODBYE = 16, /* For mDNS: item is subject to disappear */
} DnsAnswerFlags;
struct DnsAnswerItem {
DnsResourceRecord *rr;
int ifindex;
DnsAnswerFlags flags;
};
struct DnsAnswer {
unsigned n_ref;
unsigned n_rrs, n_allocated;
DnsAnswerItem items[0];
};
DnsAnswer *dns_answer_new(unsigned n);
DnsAnswer *dns_answer_ref(DnsAnswer *a);
DnsAnswer *dns_answer_unref(DnsAnswer *a);
int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl, int ifindex);
int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *combined_flags);
int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a);
int dns_answer_contains_zone_nsec3(DnsAnswer *answer, const char *zone);
int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local);
int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rr);
int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags);
int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags);
bool dns_answer_has_dname_for_cname(DnsAnswer *a, DnsResourceRecord *cname);
static inline unsigned dns_answer_size(DnsAnswer *a) {
return a ? a->n_rrs : 0;
}
static inline bool dns_answer_isempty(DnsAnswer *a) {
return dns_answer_size(a) <= 0;
}
void dns_answer_dump(DnsAnswer *answer, FILE *f);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
#define _DNS_ANSWER_FOREACH(q, kk, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL))
#define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
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))
#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)
#define _DNS_ANSWER_FOREACH_FLAGS(q, kk, fl, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, \
(kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \
(fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
#define DNS_ANSWER_FOREACH_FLAGS(kk, flags, a) _DNS_ANSWER_FOREACH_FLAGS(UNIQ, kk, flags, a)
#define _DNS_ANSWER_FOREACH_FULL(q, kk, ifi, fl, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
(fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
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), \
(fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
#define DNS_ANSWER_FOREACH_FULL(kk, ifindex, flags, a) _DNS_ANSWER_FOREACH_FULL(UNIQ, kk, ifindex, flags, a)
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