801ad6a6a9
This adds support for searching single-label hostnames in a set of configured search domains. A new object DnsQueryCandidate is added that links queries to scopes. It keeps track of the search domain last used for a query on a specific link. Whenever a host name was unsuccessfuly resolved on a scope all its transactions are flushed out and replaced by a new set, with the next search domain appended. This also adds a new flag SD_RESOLVED_NO_SEARCH to disable search domain behaviour. The "systemd-resolve-host" tool is updated to make this configurable via --search=. Fixes #1697
78 lines
3.2 KiB
C
78 lines
3.2 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 "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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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_soa(DnsAnswer *a, const char *name, uint32_t ttl);
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int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key);
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int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa);
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int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret);
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DnsAnswer *dns_answer_merge(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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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
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#define DNS_ANSWER_FOREACH(kk, a) \
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for (unsigned _i = ({ \
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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) && ((_i) < (a)->n_rrs); \
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_i++, (kk) = (_i < (a)->n_rrs ? (a)->items[_i].rr : NULL))
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#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) \
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for (unsigned _i = ({ \
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(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
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(ifindex) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
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0; \
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}); \
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(a) && ((_i) < (a)->n_rrs); \
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_i++, (kk) = ((_i < (a)->n_rrs) ? (a)->items[_i].rr : NULL), (ifindex) = ((_i < (a)->n_rrs) ? (a)->items[_i].ifindex : 0))
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