resolved-dns-rr.c revision 6af47493de0ef2b66d4c3fbcdd4a2e12fec4bfba
/*-*- 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 "alloc-util.h"
#include "dns-domain.h"
#include "dns-type.h"
#include "hexdecoct.h"
#include "resolved-dns-packet.h"
#include "resolved-dns-rr.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.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_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) {
int r;
assert(key);
assert(cname);
assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
if (cname->key->type == DNS_TYPE_CNAME)
return dns_resource_key_new(key->class, key->type, cname->cname.name);
else {
DnsResourceKey *k;
char *destination = NULL;
r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination);
if (r < 0)
return NULL;
if (r == 0)
return dns_resource_key_ref((DnsResourceKey*) key);
k = dns_resource_key_new_consume(key->class, key->type, destination);
if (!k) {
free(destination);
return NULL;
}
return k;
}
}
int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) {
DnsResourceKey *new_key;
char *joined;
int r;
assert(ret);
assert(key);
assert(name);
if (dns_name_is_root(name)) {
*ret = dns_resource_key_ref(key);
return 0;
}
r = dns_name_concat(DNS_RESOURCE_KEY_NAME(key), name, &joined);
if (r < 0)
return r;
new_key = dns_resource_key_new_consume(key->class, key->type, joined);
if (!new_key) {
free(joined);
return -ENOMEM;
}
*ret = new_key;
return 0;
}
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;
/* Static/const keys created with DNS_RESOURCE_KEY_CONST will
* set this to -1, they should not be reffed/unreffed */
assert(k->n_ref != (unsigned) -1);
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 != (unsigned) -1);
assert(k->n_ref > 0);
if (k->n_ref == 1) {
free(k->_name);
free(k);
} else
k->n_ref--;
return NULL;
}
bool dns_resource_key_is_address(const DnsResourceKey *key) {
assert(key);
/* Check if this is an A or AAAA resource key */
return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA);
}
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
int r;
if (a == b)
return 1;
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, DnsResourceRecord *rr, const char *search_domain) {
int r;
assert(key);
assert(rr);
if (key == rr->key)
return 1;
/* Checks if an rr matches the specified key. If a search
* domain is specified, it will also be checked if the key
* with the search domain suffixed might match the 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;
r = dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
if (r != 0)
return r;
if (search_domain) {
_cleanup_free_ char *joined = NULL;
r = dns_name_concat(DNS_RESOURCE_KEY_NAME(key), search_domain, &joined);
if (r < 0)
return r;
return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), joined);
}
return 0;
}
int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) {
int r;
assert(key);
assert(cname);
if (cname->class != key->class && key->class != DNS_CLASS_ANY)
return 0;
if (cname->type == DNS_TYPE_CNAME)
r = dns_name_equal(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname));
else if (cname->type == DNS_TYPE_DNAME)
r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname));
else
return 0;
if (r != 0)
return r;
if (search_domain) {
_cleanup_free_ char *joined = NULL;
r = dns_name_concat(DNS_RESOURCE_KEY_NAME(key), search_domain, &joined);
if (r < 0)
return r;
if (cname->type == DNS_TYPE_CNAME)
return dns_name_equal(joined, DNS_RESOURCE_KEY_NAME(cname));
else if (cname->type == DNS_TYPE_DNAME)
return dns_name_endswith(joined, DNS_RESOURCE_KEY_NAME(cname));
}
return 0;
}
int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) {
assert(soa);
assert(key);
/* Checks whether 'soa' is a SOA record for the specified key. */
if (soa->class != key->class)
return 0;
if (soa->type != DNS_TYPE_SOA)
return 0;
return dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(soa));
}
static void dns_resource_key_hash_func(const void *i, struct siphash *state) {
const DnsResourceKey *k = i;
assert(k);
dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), state);
siphash24_compress(&k->class, sizeof(k->class), state);
siphash24_compress(&k->type, sizeof(k->type), state);
}
static 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;
}
const struct hash_ops dns_resource_key_hash_ops = {
.hash = dns_resource_key_hash_func,
.compare = dns_resource_key_compare_func
};
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
char cbuf[strlen("CLASS") + DECIMAL_STR_MAX(uint16_t)], tbuf[strlen("TYPE") + DECIMAL_STR_MAX(uint16_t)];
const char *c, *t;
char *s;
/* If we cannot convert the CLASS/TYPE into a known string,
use the format recommended by RFC 3597, Section 5. */
c = dns_class_to_string(key->class);
if (!c) {
sprintf(cbuf, "CLASS%u", key->class);
c = cbuf;
}
t = dns_type_to_string(key->type);
if (!t){
sprintf(tbuf, "TYPE%u", key->type);
t = tbuf;
}
if (asprintf(&s, "%s. %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0)
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);
rr->expiry = USEC_INFINITY;
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_SRV:
free(rr->srv.name);
break;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME:
free(rr->ptr.name);
break;
case DNS_TYPE_HINFO:
free(rr->hinfo.cpu);
free(rr->hinfo.os);
break;
case DNS_TYPE_TXT:
case DNS_TYPE_SPF:
dns_txt_item_free_all(rr->txt.items);
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_DS:
free(rr->ds.digest);
break;
case DNS_TYPE_SSHFP:
free(rr->sshfp.fingerprint);
break;
case DNS_TYPE_DNSKEY:
free(rr->dnskey.key);
break;
case DNS_TYPE_RRSIG:
free(rr->rrsig.signer);
free(rr->rrsig.signature);
break;
case DNS_TYPE_NSEC:
free(rr->nsec.next_domain_name);
bitmap_free(rr->nsec.types);
break;
case DNS_TYPE_NSEC3:
free(rr->nsec3.next_hashed_name);
free(rr->nsec3.salt);
bitmap_free(rr->nsec3.types);
break;
case DNS_TYPE_LOC:
case DNS_TYPE_A:
case DNS_TYPE_AAAA:
break;
default:
free(rr->generic.data);
}
free(rr->wire_format);
dns_resource_key_unref(rr->key);
}
free(rr->to_string);
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_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) {
DnsResourceRecord *rr;
assert(ret);
assert(address);
assert(family);
if (family == AF_INET) {
rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name);
if (!rr)
return -ENOMEM;
rr->a.in_addr = address->in;
} else if (family == AF_INET6) {
rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name);
if (!rr)
return -ENOMEM;
rr->aaaa.in6_addr = address->in6;
} else
return -EAFNOSUPPORT;
*ret = rr;
return 0;
}
int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
int r;
assert(a);
assert(b);
if (a == b)
return 1;
r = dns_resource_key_equal(a->key, b->key);
if (r <= 0)
return r;
if (a->unparseable != b->unparseable)
return 0;
switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) {
case DNS_TYPE_SRV:
r = dns_name_equal(a->srv.name, b->srv.name);
if (r <= 0)
return r;
return a->srv.priority == b->srv.priority &&
a->srv.weight == b->srv.weight &&
a->srv.port == b->srv.port;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME:
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:
return dns_txt_item_equal(a->txt.items, b->txt.items);
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;
case DNS_TYPE_DS:
return a->ds.key_tag == b->ds.key_tag &&
a->ds.algorithm == b->ds.algorithm &&
a->ds.digest_type == b->ds.digest_type &&
a->ds.digest_size == b->ds.digest_size &&
memcmp(a->ds.digest, b->ds.digest, a->ds.digest_size) == 0;
case DNS_TYPE_SSHFP:
return a->sshfp.algorithm == b->sshfp.algorithm &&
a->sshfp.fptype == b->sshfp.fptype &&
a->sshfp.fingerprint_size == b->sshfp.fingerprint_size &&
memcmp(a->sshfp.fingerprint, b->sshfp.fingerprint, a->sshfp.fingerprint_size) == 0;
case DNS_TYPE_DNSKEY:
return a->dnskey.flags == b->dnskey.flags &&
a->dnskey.protocol == b->dnskey.protocol &&
a->dnskey.algorithm == b->dnskey.algorithm &&
a->dnskey.key_size == b->dnskey.key_size &&
memcmp(a->dnskey.key, b->dnskey.key, a->dnskey.key_size) == 0;
case DNS_TYPE_RRSIG:
/* do the fast comparisons first */
if (a->rrsig.type_covered != b->rrsig.type_covered ||
a->rrsig.algorithm != b->rrsig.algorithm ||
a->rrsig.labels != b->rrsig.labels ||
a->rrsig.original_ttl != b->rrsig.original_ttl ||
a->rrsig.expiration != b->rrsig.expiration ||
a->rrsig.inception != b->rrsig.inception ||
a->rrsig.key_tag != b->rrsig.key_tag ||
a->rrsig.signature_size != b->rrsig.signature_size ||
memcmp(a->rrsig.signature, b->rrsig.signature, a->rrsig.signature_size) != 0)
return false;
return dns_name_equal(a->rrsig.signer, b->rrsig.signer);
case DNS_TYPE_NSEC:
return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) &&
bitmap_equal(a->nsec.types, b->nsec.types);
case DNS_TYPE_NSEC3:
return a->nsec3.algorithm == b->nsec3.algorithm &&
a->nsec3.flags == b->nsec3.flags &&
a->nsec3.iterations == b->nsec3.iterations &&
a->nsec3.salt_size == b->nsec3.salt_size &&
memcmp(a->nsec3.salt, b->nsec3.salt, a->nsec3.salt_size) == 0 &&
memcmp(a->nsec3.next_hashed_name, b->nsec3.next_hashed_name, a->nsec3.next_hashed_name_size) == 0 &&
bitmap_equal(a->nsec3.types, b->nsec3.types);
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;
}
static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
struct tm tm;
assert(buf);
assert(l > strlen("YYYYMMDDHHmmSS"));
if (!gmtime_r(&sec, &tm))
return -EINVAL;
if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0)
return -EINVAL;
return 0;
}
static char *format_types(Bitmap *types) {
_cleanup_strv_free_ char **strv = NULL;
_cleanup_free_ char *str = NULL;
Iterator i;
unsigned type;
int r;
BITMAP_FOREACH(type, types, i) {
if (dns_type_to_string(type)) {
r = strv_extend(&strv, dns_type_to_string(type));
if (r < 0)
return NULL;
} else {
char *t;
r = asprintf(&t, "TYPE%u", type);
if (r < 0)
return NULL;
r = strv_consume(&strv, t);
if (r < 0)
return NULL;
}
}
str = strv_join(strv, " ");
if (!str)
return NULL;
return strjoin("( ", str, " )", NULL);
}
static char *format_txt(DnsTxtItem *first) {
DnsTxtItem *i;
size_t c = 1;
char *p, *s;
LIST_FOREACH(items, i, first)
c += i->length * 4 + 3;
p = s = new(char, c);
if (!s)
return NULL;
LIST_FOREACH(items, i, first) {
size_t j;
if (i != first)
*(p++) = ' ';
*(p++) = '"';
for (j = 0; j < i->length; j++) {
if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) {
*(p++) = '\\';
*(p++) = '0' + (i->data[j] / 100);
*(p++) = '0' + ((i->data[j] / 10) % 10);
*(p++) = '0' + (i->data[j] % 10);
} else
*(p++) = i->data[j];
}
*(p++) = '"';
}
*p = 0;
return s;
}
const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
_cleanup_free_ char *k = NULL, *t = NULL;
char *s;
int r;
assert(rr);
if (rr->to_string)
return rr->to_string;
r = dns_resource_key_to_string(rr->key, &k);
if (r < 0)
return NULL;
switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) {
case DNS_TYPE_SRV:
r = asprintf(&s, "%s %u %u %u %s",
k,
rr->srv.priority,
rr->srv.weight,
rr->srv.port,
strna(rr->srv.name));
if (r < 0)
return NULL;
break;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME:
s = strjoin(k, " ", rr->ptr.name, NULL);
if (!s)
return NULL;
break;
case DNS_TYPE_HINFO:
s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL);
if (!s)
return NULL;
break;
case DNS_TYPE_SPF: /* exactly the same as TXT */
case DNS_TYPE_TXT:
t = format_txt(rr->txt.items);
if (!t)
return NULL;
s = strjoin(k, " ", t, NULL);
if (!s)
return NULL;
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 NULL;
s = strjoin(k, " ", x, NULL);
if (!s)
return NULL;
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 NULL;
s = strjoin(k, " ", t, NULL);
if (!s)
return NULL;
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 NULL;
break;
case DNS_TYPE_MX:
r = asprintf(&s, "%s %u %s",
k,
rr->mx.priority,
rr->mx.exchange);
if (r < 0)
return NULL;
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 NULL;
s = strjoin(k, " ", t, NULL);
if (!s)
return NULL;
break;
case DNS_TYPE_DS:
t = hexmem(rr->ds.digest, rr->ds.digest_size);
if (!t)
return NULL;
r = asprintf(&s, "%s %u %u %u %s",
k,
rr->ds.key_tag,
rr->ds.algorithm,
rr->ds.digest_type,
t);
if (r < 0)
return NULL;
break;
case DNS_TYPE_SSHFP:
t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
if (!t)
return NULL;
r = asprintf(&s, "%s %u %u %s",
k,
rr->sshfp.algorithm,
rr->sshfp.fptype,
t);
if (r < 0)
return NULL;
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 NULL;
r = asprintf(&s, "%s %u %u %.*s%.*u %s",
k,
rr->dnskey.flags,
rr->dnskey.protocol,
alg ? -1 : 0, alg,
alg ? 0 : 1, alg ? 0u : (unsigned) rr->dnskey.algorithm,
t);
if (r < 0)
return NULL;
break;
}
case DNS_TYPE_RRSIG: {
const char *type, *alg;
char expiration[strlen("YYYYMMDDHHmmSS") + 1], inception[strlen("YYYYMMDDHHmmSS") + 1];
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 NULL;
r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration);
if (r < 0)
return NULL;
r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception);
if (r < 0)
return NULL;
/* TYPE?? follows
* http://tools.ietf.org/html/rfc3597#section-5 */
r = asprintf(&s, "%s %s%.*u %.*s%.*u %u %u %s %s %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,
expiration,
inception,
rr->rrsig.key_tag,
rr->rrsig.signer,
t);
if (r < 0)
return NULL;
break;
}
case DNS_TYPE_NSEC:
t = format_types(rr->nsec.types);
if (!t)
return NULL;
r = asprintf(&s, "%s %s %s",
k,
rr->nsec.next_domain_name,
t);
if (r < 0)
return NULL;
break;
case DNS_TYPE_NSEC3: {
_cleanup_free_ char *salt = NULL, *hash = NULL;
if (rr->nsec3.salt_size > 0) {
salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size);
if (!salt)
return NULL;
}
hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
if (!hash)
return NULL;
t = format_types(rr->nsec3.types);
if (!t)
return NULL;
r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s",
k,
rr->nsec3.algorithm,
rr->nsec3.flags,
rr->nsec3.iterations,
rr->nsec3.salt_size > 0 ? salt : "-",
hash,
t);
if (r < 0)
return NULL;
break;
}
default:
t = hexmem(rr->generic.data, rr->generic.size);
if (!t)
return NULL;
/* Format as documented in RFC 3597, Section 5 */
r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.size, t);
if (r < 0)
return NULL;
break;
}
rr->to_string = s;
return s;
}
int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
DnsPacket packet = {
.n_ref = 1,
.protocol = DNS_PROTOCOL_DNS,
.on_stack = true,
.refuse_compression = true,
.canonical_form = canonical,
};
size_t start, rds;
int r;
assert(rr);
/* Generates the RR in wire-format, optionally in the
* canonical form as discussed in the DNSSEC RFC 4034, Section
* 6.2. We allocate a throw-away DnsPacket object on the stack
* here, because we need some book-keeping for memory
* management, and can reuse the DnsPacket serializer, that
* can generate the canonical form, too, but also knows label
* compression and suchlike. */
if (rr->wire_format && rr->wire_format_canonical == canonical)
return 0;
r = dns_packet_append_rr(&packet, rr, &start, &rds);
if (r < 0)
return r;
assert(start == 0);
assert(packet._data);
free(rr->wire_format);
rr->wire_format = packet._data;
rr->wire_format_size = packet.size;
rr->wire_format_rdata_offset = rds;
rr->wire_format_canonical = canonical;
packet._data = NULL;
dns_packet_unref(&packet);
return 0;
}
DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) {
DnsTxtItem *n;
if (!i)
return NULL;
n = i->items_next;
free(i);
return dns_txt_item_free_all(n);
}
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
if (a == b)
return true;
if (!a != !b)
return false;
if (!a)
return true;
if (a->length != b->length)
return false;
if (memcmp(a->data, b->data, a->length) != 0)
return false;
return dns_txt_item_equal(a->items_next, b->items_next);
}
static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
/* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
[DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
[DNSSEC_ALGORITHM_DH] = "DH",
[DNSSEC_ALGORITHM_DSA] = "DSA",
[DNSSEC_ALGORITHM_ECC] = "ECC",
[DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
[DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
[DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
[DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256",
[DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512",
[DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST",
[DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256",
[DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384",
[DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
[DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
[DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
};
DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
/* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
[DNSSEC_DIGEST_SHA1] = "SHA-1",
[DNSSEC_DIGEST_SHA256] = "SHA-256",
[DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94",
[DNSSEC_DIGEST_SHA384] = "SHA-384",
};
DEFINE_STRING_TABLE_LOOKUP(dnssec_digest, int);