resolved-dns-rr.c revision 0dae31d468b1a0e22d98921f7b0dbd92fd217167
/*-*- 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 <math.h>
#include "strv.h"
#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;
}
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)];
const char *c, *t;
char *s;
c = dns_class_to_string(key->class);
if (!c) {
sprintf(cbuf, "%i", key->class);
c = cbuf;
}
t = dns_type_to_string(key->type);
if (!t){
sprintf(tbuf, "%i", key->type);
t = tbuf;
}
s = strjoin(DNS_RESOURCE_KEY_NAME(key), " ", c, " ", t, NULL);
if (!s)
return -ENOMEM;
*ret = s;
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_new_full(uint16_t class, uint16_t type, const char *name) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
key = dns_resource_key_new(class, type, name);
if (!key)
return NULL;
return dns_resource_record_new(key);
}
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) {
switch(rr->key->type) {
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
free(rr->ptr.name);
break;
case DNS_TYPE_HINFO:
free(rr->hinfo.cpu);
free(rr->hinfo.os);
break;
case DNS_TYPE_SPF:
case DNS_TYPE_TXT:
strv_free(rr->txt.strings);
break;
case DNS_TYPE_SOA:
free(rr->soa.mname);
free(rr->soa.rname);
break;
case DNS_TYPE_MX:
free(rr->mx.exchange);
break;
case DNS_TYPE_LOC:
case DNS_TYPE_A:
case DNS_TYPE_AAAA:
break;
default:
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;
switch (a->key->type) {
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
return dns_name_equal(a->ptr.name, b->ptr.name);
case DNS_TYPE_HINFO:
return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
strcaseeq(a->hinfo.os, b->hinfo.os);
case DNS_TYPE_SPF: /* exactly the same as TXT */
case DNS_TYPE_TXT: {
int i;
for (i = 0; a->txt.strings[i] || b->txt.strings[i]; i++)
if (!streq_ptr(a->txt.strings[i], b->txt.strings[i]))
return false;
return true;
}
case DNS_TYPE_A:
return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
case DNS_TYPE_AAAA:
return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
case 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;
case DNS_TYPE_MX:
if (a->mx.priority != b->mx.priority)
return 0;
return dns_name_equal(a->mx.exchange, b->mx.exchange);
case DNS_TYPE_LOC:
assert(a->loc.version == b->loc.version);
return a->loc.size == b->loc.size &&
a->loc.horiz_pre == b->loc.horiz_pre &&
a->loc.vert_pre == b->loc.vert_pre &&
a->loc.latitude == b->loc.latitude &&
a->loc.longitude == b->loc.longitude &&
a->loc.altitude == b->loc.altitude;
default:
return a->generic.size == b->generic.size &&
memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
}
}
static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude,
uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) {
char *s;
char NS = latitude >= 1U<<31 ? 'N' : 'S';
char EW = longitude >= 1U<<31 ? 'E' : 'W';
int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude);
int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude);
double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude);
double siz = (size >> 4) * exp10((double) (size & 0xF));
double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF));
double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF));
if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm",
(lat / 60000 / 60),
(lat / 60000) % 60,
(lat % 60000) / 1000.,
NS,
(lon / 60000 / 60),
(lon / 60000) % 60,
(lon % 60000) / 1000.,
EW,
alt / 100.,
siz / 100.,
hor / 100.,
ver / 100.) < 0)
return NULL;
return s;
}
int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
_cleanup_free_ char *k = NULL;
char *s;
int r;
assert(rr);
r = dns_resource_key_to_string(rr->key, &k);
if (r < 0)
return r;
switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) {
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
s = strjoin(k, " ", rr->ptr.name, NULL);
if (!s)
return -ENOMEM;
break;
case DNS_TYPE_HINFO:
s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL);
if (!s)
return -ENOMEM;
break;
case DNS_TYPE_SPF: /* exactly the same as TXT */
case DNS_TYPE_TXT: {
_cleanup_free_ char *t;
t = strv_join_quoted(rr->txt.strings);
if (!t)
return -ENOMEM;
s = strjoin(k, " ", t, NULL);
if (!s)
return -ENOMEM;
break;
}
case DNS_TYPE_A: {
_cleanup_free_ char *x = NULL;
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: {
_cleanup_free_ char *x = NULL;
r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &x);
if (r < 0)
return r;
s = strjoin(k, " ", x, 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: {
_cleanup_free_ char *loc;
assert(rr->loc.version == 0);
loc = format_location(rr->loc.latitude,
rr->loc.longitude,
rr->loc.altitude,
rr->loc.size,
rr->loc.horiz_pre,
rr->loc.vert_pre);
if (!loc)
return -ENOMEM;
s = strjoin(k, " ", loc, NULL);
if (!s)
return -ENOMEM;
break;
}
default: {
_cleanup_free_ char *x = NULL;
x = hexmem(rr->generic.data, rr->generic.size);
if (!x)
return -ENOMEM;
s = strjoin(k, " ", x, 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;
}
static const struct {
uint16_t type;
const char *name;
} dns_types[] = {
{ DNS_TYPE_A, "A" },
{ DNS_TYPE_NS, "NS" },
{ DNS_TYPE_CNAME, "CNAME" },
{ DNS_TYPE_SOA, "SOA" },
{ DNS_TYPE_PTR, "PTR" },
{ DNS_TYPE_HINFO, "HINFO" },
{ DNS_TYPE_MX, "MX" },
{ DNS_TYPE_TXT, "TXT" },
{ DNS_TYPE_AAAA, "AAAA" },
{ DNS_TYPE_LOC, "LOC" },
{ DNS_TYPE_SRV, "SRV" },
{ DNS_TYPE_SSHFP, "SSHFP" },
{ DNS_TYPE_SPF, "SPF" },
{ DNS_TYPE_DNAME, "DNAME" },
{ DNS_TYPE_ANY, "ANY" },
{ DNS_TYPE_OPT, "OPT" },
{ DNS_TYPE_TKEY, "TKEY" },
{ DNS_TYPE_TSIG, "TSIG" },
{ DNS_TYPE_IXFR, "IXFR" },
{ DNS_TYPE_AXFR, "AXFR" },
};
const char *dns_type_to_string(uint16_t type) {
unsigned i;
for (i = 0; i < ELEMENTSOF(dns_types); i++)
if (dns_types[i].type == type)
return dns_types[i].name;
return NULL;
}
int dns_type_from_string(const char *s, uint16_t *type) {
unsigned i;
assert(s);
assert(type);
for (i = 0; i < ELEMENTSOF(dns_types); i++)
if (strcaseeq(dns_types[i].name, s)) {
*type = dns_types[i].type;
return 0;
}
return -EINVAL;
}