88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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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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#include "dns-type.h"
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typedef const struct {
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uint16_t type;
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const char *name;
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} dns_type;
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static const struct dns_type_name *
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lookup_dns_type (register const char *str, register unsigned int len);
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#include "dns_type-from-name.h"
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#include "dns_type-to-name.h"
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int dns_type_from_string(const char *s) {
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const struct dns_type_name *sc;
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assert(s);
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sc = lookup_dns_type(s, strlen(s));
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if (!sc)
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return _DNS_TYPE_INVALID;
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return sc->id;
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}
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bool dns_type_is_pseudo(uint16_t type) {
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/* Checks whether the specified type is a "pseudo-type". What
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* a "pseudo-type" precisely is, is defined only very weakly,
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* but apparently entails all RR types that are not actually
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* stored as RRs on the server and should hence also not be
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* cached. We use this list primarily to validate NSEC type
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* bitfields, and to verify what to cache. */
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return IN_SET(type,
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0, /* A Pseudo RR type, according to RFC 2931 */
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DNS_TYPE_ANY,
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DNS_TYPE_AXFR,
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DNS_TYPE_IXFR,
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DNS_TYPE_OPT,
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DNS_TYPE_TSIG,
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DNS_TYPE_TKEY
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);
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}
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bool dns_type_is_valid_query(uint16_t type) {
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/* The types valid as questions in packets */
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return !IN_SET(type,
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0,
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DNS_TYPE_OPT,
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DNS_TYPE_TSIG,
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DNS_TYPE_TKEY);
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}
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bool dns_type_is_valid_rr(uint16_t type) {
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/* The types valid as RR in packets (but not necessarily
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* stored on servers). */
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return !IN_SET(type,
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DNS_TYPE_ANY,
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DNS_TYPE_AXFR,
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DNS_TYPE_IXFR);
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}
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