resolved-dns-rr.c revision 623a4c97b9175f95c4b1c6fc34e36c56f1e4ddbf
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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/>.
***/
#include "resolved-dns-domain.h"
#include "resolved-dns-rr.h"
DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) {
DnsResourceKey *k;
size_t l;
assert(name);
l = strlen(name);
k = malloc0(sizeof(DnsResourceKey) + l + 1);
if (!k)
return NULL;
k->n_ref = 1;
k->class = class;
k->type = type;
strcpy((char*) k + sizeof(DnsResourceKey), name);
return k;
}
DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
DnsResourceKey *k;
assert(name);
k = new0(DnsResourceKey, 1);
if (!k)
return NULL;
k->n_ref = 1;
k->class = class;
k->type = type;
k->_name = name;
return k;
}
DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) {
if (!k)
return NULL;
assert(k->n_ref > 0);
k->n_ref++;
return k;
}
DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) {
if (!k)
return NULL;
assert(k->n_ref > 0);
if (k->n_ref == 1) {
free(k->_name);
free(k);
} else
k->n_ref--;
return NULL;
}
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
int r;
r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b));
if (r <= 0)
return r;
if (a->class != b->class)
return 0;
if (a->type != b->type)
return 0;
return 1;
}
int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr) {
assert(key);
assert(rr);
if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
return 0;
if (rr->key->type != key->type && key->type != DNS_TYPE_ANY)
return 0;
return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
}
int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr) {
assert(key);
assert(rr);
if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
return 0;
if (rr->key->type != DNS_TYPE_CNAME)
return 0;
return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
}
unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) {
const DnsResourceKey *k = i;
unsigned long ul;
ul = dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), hash_key);
ul = ul * hash_key[0] + ul + k->class;
ul = ul * hash_key[1] + ul + k->type;
return ul;
}
int dns_resource_key_compare_func(const void *a, const void *b) {
const DnsResourceKey *x = a, *y = b;
int ret;
ret = dns_name_compare_func(DNS_RESOURCE_KEY_NAME(x), DNS_RESOURCE_KEY_NAME(y));
if (ret != 0)
return ret;
if (x->type < y->type)
return -1;
if (x->type > y->type)
return 1;
if (x->class < y->class)
return -1;
if (x->class > y->class)
return 1;
return 0;
}
DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
DnsResourceRecord *rr;
rr = new0(DnsResourceRecord, 1);
if (!rr)
return NULL;
rr->n_ref = 1;
rr->key = dns_resource_key_ref(key);
return rr;
}
DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) {
if (!rr)
return NULL;
assert(rr->n_ref > 0);
rr->n_ref++;
return rr;
}
DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
if (!rr)
return NULL;
assert(rr->n_ref > 0);
if (rr->n_ref > 1) {
rr->n_ref--;
return NULL;
}
if (rr->key) {
if (IN_SET(rr->key->type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME))
free(rr->ptr.name);
else if (rr->key->type == DNS_TYPE_HINFO) {
free(rr->hinfo.cpu);
free(rr->hinfo.os);
} else if (rr->key->type == DNS_TYPE_SOA) {
free(rr->soa.mname);
free(rr->soa.rname);
} else if (!IN_SET(rr->key->type, DNS_TYPE_A, DNS_TYPE_AAAA))
free(rr->generic.data);
dns_resource_key_unref(rr->key);
}
free(rr);
return NULL;
}
int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
_cleanup_free_ char *ptr = NULL;
int r;
assert(ret);
assert(address);
assert(hostname);
r = dns_name_reverse(family, address, &ptr);
if (r < 0)
return r;
key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr);
if (!key)
return -ENOMEM;
ptr = NULL;
rr = dns_resource_record_new(key);
if (!rr)
return -ENOMEM;
rr->ptr.name = strdup(hostname);
if (!rr->ptr.name)
return -ENOMEM;
*ret = rr;
rr = NULL;
return 0;
}
int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
int r;
assert(a);
assert(b);
r = dns_resource_key_equal(a->key, b->key);
if (r <= 0)
return r;
if (IN_SET(a->key->type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME))
return dns_name_equal(a->ptr.name, b->ptr.name);
else if (a->key->type == DNS_TYPE_HINFO)
return strcasecmp(a->hinfo.cpu, b->hinfo.cpu) == 0 &&
strcasecmp(a->hinfo.os, b->hinfo.os) == 0;
else if (a->key->type == DNS_TYPE_A)
return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
else if (a->key->type == DNS_TYPE_AAAA)
return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
else if (a->key->type == DNS_TYPE_SOA) {
r = dns_name_equal(a->soa.mname, b->soa.mname);
if (r <= 0)
return r;
r = dns_name_equal(a->soa.rname, b->soa.rname);
if (r <= 0)
return r;
return a->soa.serial == b->soa.serial &&
a->soa.refresh == b->soa.refresh &&
a->soa.retry == b->soa.retry &&
a->soa.expire == b->soa.expire &&
a->soa.minimum == b->soa.minimum;
} else
return a->generic.size == b->generic.size &&
memcmp(a->generic.data, b->generic.data, a->generic.size) == 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;
}
const char *dns_type_to_string(uint16_t type) {
switch (type) {
case DNS_TYPE_A:
return "A";
case DNS_TYPE_NS:
return "NS";
case DNS_TYPE_CNAME:
return "CNAME";
case DNS_TYPE_SOA:
return "SOA";
case DNS_TYPE_PTR:
return "PTR";
case DNS_TYPE_HINFO:
return "HINFO";
case DNS_TYPE_MX:
return "MX";
case DNS_TYPE_TXT:
return "TXT";
case DNS_TYPE_AAAA:
return "AAAA";
case DNS_TYPE_SRV:
return "SRV";
case DNS_TYPE_SSHFP:
return "SSHFP";
case DNS_TYPE_DNAME:
return "DNAME";
case DNS_TYPE_ANY:
return "ANY";
case DNS_TYPE_OPT:
return "OPT";
case DNS_TYPE_TKEY:
return "TKEY";
case DNS_TYPE_TSIG:
return "TSIG";
case DNS_TYPE_IXFR:
return "IXFR";
case DNS_TYPE_AXFR:
return "AXFR";
}
return NULL;
}