699 lines
21 KiB
C
699 lines
21 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 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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#include <math.h>
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#include "strv.h"
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#include "dns-domain.h"
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#include "resolved-dns-rr.h"
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#include "resolved-dns-packet.h"
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#include "dns-type.h"
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DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) {
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DnsResourceKey *k;
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size_t l;
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assert(name);
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l = strlen(name);
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k = malloc0(sizeof(DnsResourceKey) + l + 1);
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if (!k)
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return NULL;
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k->n_ref = 1;
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k->class = class;
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k->type = type;
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strcpy((char*) k + sizeof(DnsResourceKey), name);
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return k;
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}
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DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
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DnsResourceKey *k;
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assert(name);
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k = new0(DnsResourceKey, 1);
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if (!k)
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return NULL;
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k->n_ref = 1;
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k->class = class;
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k->type = type;
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k->_name = name;
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return k;
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}
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DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) {
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if (!k)
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return NULL;
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assert(k->n_ref > 0);
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k->n_ref++;
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return k;
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}
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DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) {
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if (!k)
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return NULL;
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assert(k->n_ref > 0);
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if (k->n_ref == 1) {
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free(k->_name);
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free(k);
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} else
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k->n_ref--;
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return NULL;
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}
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int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
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int r;
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r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b));
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if (r <= 0)
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return r;
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if (a->class != b->class)
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return 0;
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if (a->type != b->type)
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return 0;
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return 1;
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}
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int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr) {
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assert(key);
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assert(rr);
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if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
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return 0;
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if (rr->key->type != key->type && key->type != DNS_TYPE_ANY)
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return 0;
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return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
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}
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int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr) {
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assert(key);
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assert(rr);
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if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
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return 0;
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if (rr->key->type != DNS_TYPE_CNAME)
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return 0;
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return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
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}
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static unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) {
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const DnsResourceKey *k = i;
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unsigned long ul;
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ul = dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), hash_key);
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ul = ul * hash_key[0] + ul + k->class;
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ul = ul * hash_key[1] + ul + k->type;
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return ul;
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}
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static int dns_resource_key_compare_func(const void *a, const void *b) {
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const DnsResourceKey *x = a, *y = b;
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int ret;
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ret = dns_name_compare_func(DNS_RESOURCE_KEY_NAME(x), DNS_RESOURCE_KEY_NAME(y));
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if (ret != 0)
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return ret;
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if (x->type < y->type)
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return -1;
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if (x->type > y->type)
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return 1;
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if (x->class < y->class)
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return -1;
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if (x->class > y->class)
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return 1;
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return 0;
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}
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const struct hash_ops dns_resource_key_hash_ops = {
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.hash = dns_resource_key_hash_func,
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.compare = dns_resource_key_compare_func
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};
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int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
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char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)];
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const char *c, *t;
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char *s;
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c = dns_class_to_string(key->class);
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if (!c) {
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sprintf(cbuf, "%i", key->class);
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c = cbuf;
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}
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t = dns_type_to_string(key->type);
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if (!t){
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sprintf(tbuf, "%i", key->type);
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t = tbuf;
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}
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if (asprintf(&s, "%s %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
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DnsResourceRecord *rr;
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rr = new0(DnsResourceRecord, 1);
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if (!rr)
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return NULL;
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rr->n_ref = 1;
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rr->key = dns_resource_key_ref(key);
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return rr;
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}
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DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) {
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_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
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key = dns_resource_key_new(class, type, name);
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if (!key)
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return NULL;
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return dns_resource_record_new(key);
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}
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DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) {
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if (!rr)
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return NULL;
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assert(rr->n_ref > 0);
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rr->n_ref++;
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return rr;
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}
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DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
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if (!rr)
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return NULL;
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assert(rr->n_ref > 0);
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if (rr->n_ref > 1) {
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rr->n_ref--;
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return NULL;
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}
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if (rr->key) {
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switch(rr->key->type) {
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case DNS_TYPE_SRV:
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free(rr->srv.name);
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break;
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case DNS_TYPE_PTR:
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case DNS_TYPE_NS:
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case DNS_TYPE_CNAME:
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case DNS_TYPE_DNAME:
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free(rr->ptr.name);
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break;
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case DNS_TYPE_HINFO:
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free(rr->hinfo.cpu);
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free(rr->hinfo.os);
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break;
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case DNS_TYPE_TXT:
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case DNS_TYPE_SPF:
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strv_free(rr->txt.strings);
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break;
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case DNS_TYPE_SOA:
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free(rr->soa.mname);
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free(rr->soa.rname);
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break;
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case DNS_TYPE_MX:
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free(rr->mx.exchange);
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break;
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case DNS_TYPE_SSHFP:
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free(rr->sshfp.key);
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break;
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case DNS_TYPE_DNSKEY:
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free(rr->dnskey.key);
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break;
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case DNS_TYPE_RRSIG:
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free(rr->rrsig.signer);
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free(rr->rrsig.signature);
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break;
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case DNS_TYPE_LOC:
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case DNS_TYPE_A:
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case DNS_TYPE_AAAA:
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break;
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default:
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free(rr->generic.data);
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}
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dns_resource_key_unref(rr->key);
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}
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free(rr);
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return NULL;
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}
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int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) {
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_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
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_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
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_cleanup_free_ char *ptr = NULL;
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int r;
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assert(ret);
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assert(address);
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assert(hostname);
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r = dns_name_reverse(family, address, &ptr);
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if (r < 0)
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return r;
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key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr);
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if (!key)
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return -ENOMEM;
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ptr = NULL;
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rr = dns_resource_record_new(key);
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if (!rr)
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return -ENOMEM;
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rr->ptr.name = strdup(hostname);
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if (!rr->ptr.name)
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return -ENOMEM;
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*ret = rr;
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rr = NULL;
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return 0;
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}
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int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
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int r;
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assert(a);
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assert(b);
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r = dns_resource_key_equal(a->key, b->key);
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if (r <= 0)
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return r;
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if (a->unparseable != b->unparseable)
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return 0;
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switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) {
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case DNS_TYPE_SRV:
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r = dns_name_equal(a->srv.name, b->srv.name);
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if (r <= 0)
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return r;
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return a->srv.priority == b->srv.priority &&
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a->srv.weight == b->srv.weight &&
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a->srv.port == b->srv.port;
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case DNS_TYPE_PTR:
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case DNS_TYPE_NS:
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case DNS_TYPE_CNAME:
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case DNS_TYPE_DNAME:
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return dns_name_equal(a->ptr.name, b->ptr.name);
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case DNS_TYPE_HINFO:
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return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
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strcaseeq(a->hinfo.os, b->hinfo.os);
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case DNS_TYPE_SPF: /* exactly the same as TXT */
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case DNS_TYPE_TXT:
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return strv_equal(a->txt.strings, b->txt.strings);
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case DNS_TYPE_A:
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return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
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case DNS_TYPE_AAAA:
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return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
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case DNS_TYPE_SOA:
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r = dns_name_equal(a->soa.mname, b->soa.mname);
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if (r <= 0)
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return r;
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r = dns_name_equal(a->soa.rname, b->soa.rname);
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if (r <= 0)
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return r;
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return a->soa.serial == b->soa.serial &&
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a->soa.refresh == b->soa.refresh &&
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a->soa.retry == b->soa.retry &&
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a->soa.expire == b->soa.expire &&
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a->soa.minimum == b->soa.minimum;
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case DNS_TYPE_MX:
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if (a->mx.priority != b->mx.priority)
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return 0;
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return dns_name_equal(a->mx.exchange, b->mx.exchange);
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case DNS_TYPE_LOC:
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assert(a->loc.version == b->loc.version);
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return a->loc.size == b->loc.size &&
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a->loc.horiz_pre == b->loc.horiz_pre &&
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a->loc.vert_pre == b->loc.vert_pre &&
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a->loc.latitude == b->loc.latitude &&
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a->loc.longitude == b->loc.longitude &&
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a->loc.altitude == b->loc.altitude;
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case DNS_TYPE_SSHFP:
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return a->sshfp.algorithm == b->sshfp.algorithm &&
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a->sshfp.fptype == b->sshfp.fptype &&
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a->sshfp.key_size == b->sshfp.key_size &&
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memcmp(a->sshfp.key, b->sshfp.key, a->sshfp.key_size) == 0;
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case DNS_TYPE_DNSKEY:
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return a->dnskey.zone_key_flag == b->dnskey.zone_key_flag &&
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a->dnskey.sep_flag == b->dnskey.sep_flag &&
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a->dnskey.algorithm == b->dnskey.algorithm &&
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a->dnskey.key_size == b->dnskey.key_size &&
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memcmp(a->dnskey.key, b->dnskey.key, a->dnskey.key_size) == 0;
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case DNS_TYPE_RRSIG:
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/* do the fast comparisons first */
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if (a->rrsig.type_covered != b->rrsig.type_covered ||
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a->rrsig.algorithm != b->rrsig.algorithm ||
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a->rrsig.labels != b->rrsig.labels ||
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a->rrsig.original_ttl != b->rrsig.original_ttl ||
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a->rrsig.expiration != b->rrsig.expiration ||
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a->rrsig.inception != b->rrsig.inception ||
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a->rrsig.key_tag != b->rrsig.key_tag ||
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a->rrsig.signature_size != b->rrsig.signature_size ||
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memcmp(a->rrsig.signature, b->rrsig.signature, a->rrsig.signature_size) != 0)
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return false;
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return dns_name_equal(a->rrsig.signer, b->rrsig.signer);
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default:
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return a->generic.size == b->generic.size &&
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memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
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}
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}
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static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude,
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uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) {
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char *s;
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char NS = latitude >= 1U<<31 ? 'N' : 'S';
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char EW = longitude >= 1U<<31 ? 'E' : 'W';
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int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude);
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int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude);
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double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude);
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double siz = (size >> 4) * exp10((double) (size & 0xF));
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double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF));
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double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF));
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if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm",
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(lat / 60000 / 60),
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(lat / 60000) % 60,
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(lat % 60000) / 1000.,
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NS,
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(lon / 60000 / 60),
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(lon / 60000) % 60,
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(lon % 60000) / 1000.,
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EW,
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alt / 100.,
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siz / 100.,
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hor / 100.,
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ver / 100.) < 0)
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return NULL;
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return s;
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}
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int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
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_cleanup_free_ char *k = NULL, *t = NULL;
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char *s;
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int r;
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assert(rr);
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r = dns_resource_key_to_string(rr->key, &k);
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if (r < 0)
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return r;
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switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) {
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case DNS_TYPE_SRV:
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r = asprintf(&s, "%s %u %u %u %s",
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k,
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rr->srv.priority,
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rr->srv.weight,
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rr->srv.port,
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strna(rr->srv.name));
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if (r < 0)
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return -ENOMEM;
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break;
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case DNS_TYPE_PTR:
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case DNS_TYPE_NS:
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case DNS_TYPE_CNAME:
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case DNS_TYPE_DNAME:
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s = strjoin(k, " ", rr->ptr.name, NULL);
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if (!s)
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return -ENOMEM;
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break;
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case DNS_TYPE_HINFO:
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s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL);
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if (!s)
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return -ENOMEM;
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break;
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case DNS_TYPE_SPF: /* exactly the same as TXT */
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case DNS_TYPE_TXT:
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t = strv_join_quoted(rr->txt.strings);
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if (!t)
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return -ENOMEM;
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s = strjoin(k, " ", t, NULL);
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if (!s)
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return -ENOMEM;
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break;
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case DNS_TYPE_A: {
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_cleanup_free_ char *x = NULL;
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r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
s = strjoin(k, " ", x, NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
case DNS_TYPE_AAAA:
|
|
r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
s = strjoin(k, " ", t, NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case DNS_TYPE_SOA:
|
|
r = asprintf(&s, "%s %s %s %u %u %u %u %u",
|
|
k,
|
|
strna(rr->soa.mname),
|
|
strna(rr->soa.rname),
|
|
rr->soa.serial,
|
|
rr->soa.refresh,
|
|
rr->soa.retry,
|
|
rr->soa.expire,
|
|
rr->soa.minimum);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case DNS_TYPE_MX:
|
|
r = asprintf(&s, "%s %u %s",
|
|
k,
|
|
rr->mx.priority,
|
|
rr->mx.exchange);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case DNS_TYPE_LOC:
|
|
assert(rr->loc.version == 0);
|
|
|
|
t = format_location(rr->loc.latitude,
|
|
rr->loc.longitude,
|
|
rr->loc.altitude,
|
|
rr->loc.size,
|
|
rr->loc.horiz_pre,
|
|
rr->loc.vert_pre);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
s = strjoin(k, " ", t, NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case DNS_TYPE_SSHFP:
|
|
t = hexmem(rr->sshfp.key, rr->sshfp.key_size);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
r = asprintf(&s, "%s %u %u %s",
|
|
k,
|
|
rr->sshfp.algorithm,
|
|
rr->sshfp.fptype,
|
|
t);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case DNS_TYPE_DNSKEY: {
|
|
const char *alg;
|
|
|
|
alg = dnssec_algorithm_to_string(rr->dnskey.algorithm);
|
|
|
|
t = base64mem(rr->dnskey.key, rr->dnskey.key_size);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
r = asprintf(&s, "%s %u 3 %.*s%.*u %s",
|
|
k,
|
|
dnskey_to_flags(rr),
|
|
alg ? -1 : 0, alg,
|
|
alg ? 0 : 1, alg ? 0u : (unsigned) rr->dnskey.algorithm,
|
|
t);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
case DNS_TYPE_RRSIG: {
|
|
const char *type, *alg;
|
|
|
|
type = dns_type_to_string(rr->rrsig.type_covered);
|
|
alg = dnssec_algorithm_to_string(rr->rrsig.algorithm);
|
|
|
|
t = base64mem(rr->rrsig.signature, rr->rrsig.signature_size);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
/* TYPE?? follows
|
|
* http://tools.ietf.org/html/rfc3597#section-5 */
|
|
|
|
r = asprintf(&s, "%s %s%.*u %.*s%.*u %u %u %u %u %u %s %s",
|
|
k,
|
|
type ?: "TYPE",
|
|
type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
|
|
alg ? -1 : 0, alg,
|
|
alg ? 0 : 1, alg ? 0u : (unsigned) rr->rrsig.algorithm,
|
|
rr->rrsig.labels,
|
|
rr->rrsig.original_ttl,
|
|
rr->rrsig.expiration,
|
|
rr->rrsig.inception,
|
|
rr->rrsig.key_tag,
|
|
rr->rrsig.signer,
|
|
t);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
t = hexmem(rr->generic.data, rr->generic.size);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
s = strjoin(k, " ", t, NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
const char *dns_class_to_string(uint16_t class) {
|
|
|
|
switch (class) {
|
|
|
|
case DNS_CLASS_IN:
|
|
return "IN";
|
|
|
|
case DNS_CLASS_ANY:
|
|
return "ANY";
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int dns_class_from_string(const char *s, uint16_t *class) {
|
|
assert(s);
|
|
assert(class);
|
|
|
|
if (strcaseeq(s, "IN"))
|
|
*class = DNS_CLASS_IN;
|
|
else if (strcaseeq(s, "ANY"))
|
|
*class = DNS_TYPE_ANY;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|