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/* Copyright (C) 2024 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include "libknot/attribute.h"
#include "libknot/descriptor.h"
/*!
* \brief Table with DNS classes.
*/
static const char* dns_classes[] = {
[KNOT_CLASS_IN] = "IN",
[KNOT_CLASS_CH] = "CH",
[KNOT_CLASS_NONE] = "NONE",
[KNOT_CLASS_ANY] = "ANY"
};
/*!
* \brief RR type descriptors.
*/
static const knot_rdata_descriptor_t rdata_descriptors[] = {
[0] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, NULL },
[KNOT_RRTYPE_A] = { { 4, KNOT_RDATA_WF_END }, "A" },
[KNOT_RRTYPE_NS] = { { KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "NS" },
[KNOT_RRTYPE_CNAME] = { { KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "CNAME" },
[KNOT_RRTYPE_SOA] = { { KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
20, KNOT_RDATA_WF_END }, "SOA" },
[KNOT_RRTYPE_NULL] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "NULL" },
[KNOT_RRTYPE_PTR] = { { KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "PTR" },
[KNOT_RRTYPE_HINFO] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "HINFO" },
[KNOT_RRTYPE_MINFO] = { { KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MINFO" },
[KNOT_RRTYPE_MX] = { { 2, KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MX" },
[KNOT_RRTYPE_TXT] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "TXT" },
[KNOT_RRTYPE_RP] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "RP" },
[KNOT_RRTYPE_AFSDB] = { { 2, KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "AFSDB" },
[KNOT_RRTYPE_RT] = { { 2, KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "RT" },
[KNOT_RRTYPE_SIG] = { { 18, KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "SIG" },
[KNOT_RRTYPE_KEY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "KEY" },
[KNOT_RRTYPE_AAAA] = { { 16, KNOT_RDATA_WF_END }, "AAAA" },
[KNOT_RRTYPE_LOC] = { { 16, KNOT_RDATA_WF_END }, "LOC" },
[KNOT_RRTYPE_SRV] = { { 6, KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "SRV" },
[KNOT_RRTYPE_NAPTR] = { { KNOT_RDATA_WF_NAPTR_HEADER,
KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "NAPTR" },
[KNOT_RRTYPE_KX] = { { 2, KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_END }, "KX" },
[KNOT_RRTYPE_CERT] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "CERT" },
[KNOT_RRTYPE_DNAME] = { { KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_END }, "DNAME" },
[KNOT_RRTYPE_OPT] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "OPT" },
[KNOT_RRTYPE_APL] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "APL" },
[KNOT_RRTYPE_DS] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "DS" },
[KNOT_RRTYPE_SSHFP] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "SSHFP" },
[KNOT_RRTYPE_IPSECKEY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "IPSECKEY" },
[KNOT_RRTYPE_RRSIG] = { { 18, KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "RRSIG" },
[KNOT_RRTYPE_NSEC] = { { KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "NSEC" },
[KNOT_RRTYPE_DNSKEY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "DNSKEY" },
[KNOT_RRTYPE_DHCID] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "DHCID" },
[KNOT_RRTYPE_NSEC3] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "NSEC3" },
[KNOT_RRTYPE_NSEC3PARAM] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "NSEC3PARAM" },
[KNOT_RRTYPE_TLSA] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "TLSA" },
[KNOT_RRTYPE_SMIMEA] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "SMIMEA" },
[KNOT_RRTYPE_CDS] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "CDS" },
[KNOT_RRTYPE_CDNSKEY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "CDNSKEY" },
[KNOT_RRTYPE_OPENPGPKEY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "OPENPGPKEY" },
[KNOT_RRTYPE_CSYNC] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "CSYNC" },
[KNOT_RRTYPE_ZONEMD] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "ZONEMD" },
[KNOT_RRTYPE_SVCB] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "SVCB" },
[KNOT_RRTYPE_HTTPS] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "HTTPS" },
[KNOT_RRTYPE_SPF] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "SPF" },
[KNOT_RRTYPE_NID] = { { 10, KNOT_RDATA_WF_END }, "NID" },
[KNOT_RRTYPE_L32] = { { 6, KNOT_RDATA_WF_END }, "L32" },
[KNOT_RRTYPE_L64] = { { 10, KNOT_RDATA_WF_END }, "L64" },
[KNOT_RRTYPE_LP] = { { 2, KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_END }, "LP" },
[KNOT_RRTYPE_EUI48] = { { 6, KNOT_RDATA_WF_END }, "EUI48" },
[KNOT_RRTYPE_EUI64] = { { 8, KNOT_RDATA_WF_END }, "EUI64" },
[KNOT_RRTYPE_TKEY] = { { KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "TKEY" },
[KNOT_RRTYPE_TSIG] = { { KNOT_RDATA_WF_FIXED_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "TSIG" },
[KNOT_RRTYPE_IXFR] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "IXFR" },
[KNOT_RRTYPE_AXFR] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "AXFR" },
[KNOT_RRTYPE_ANY] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "ANY" },
[KNOT_RRTYPE_URI] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "URI" },
[KNOT_RRTYPE_CAA] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "CAA" },
[KNOT_RRTYPE_WALLET] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "WALLET" },
};
#define MAX_RRTYPE sizeof(rdata_descriptors) / sizeof(knot_rdata_descriptor_t) - 1
/*!
* \brief Some (OBSOLETE) RR type descriptors.
*/
static const knot_rdata_descriptor_t obsolete_rdata_descriptors[] = {
[0] = { { KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, NULL },
[KNOT_RRTYPE_MD] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MD" },
[KNOT_RRTYPE_MF] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MF" },
[KNOT_RRTYPE_MB] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MB" },
[KNOT_RRTYPE_MG] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MG" },
[KNOT_RRTYPE_MR] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "MR" },
[KNOT_RRTYPE_PX] = { { 2, KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_END }, "PX" },
[KNOT_RRTYPE_NXT] = { { KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
KNOT_RDATA_WF_REMAINDER,
KNOT_RDATA_WF_END }, "NXT" },
};
_public_
const knot_rdata_descriptor_t *knot_get_rdata_descriptor(const uint16_t type)
{
if (type <= MAX_RRTYPE && rdata_descriptors[type].type_name != NULL) {
return &rdata_descriptors[type];
} else {
return &rdata_descriptors[0];
}
}
_public_
const knot_rdata_descriptor_t *knot_get_obsolete_rdata_descriptor(const uint16_t type)
{
if (type <= KNOT_RRTYPE_NXT &&
obsolete_rdata_descriptors[type].type_name != NULL) {
return &obsolete_rdata_descriptors[type];
} else {
return &obsolete_rdata_descriptors[0];
}
}
_public_
int knot_rrtype_to_string(const uint16_t rrtype,
char *out,
const size_t out_len)
{
if (out == NULL) {
return -1;
}
int ret;
const knot_rdata_descriptor_t *descr = knot_get_rdata_descriptor(rrtype);
if (descr->type_name != NULL) {
ret = snprintf(out, out_len, "%s", descr->type_name);
} else {
ret = snprintf(out, out_len, "TYPE%u", rrtype);
}
if (ret <= 0 || (size_t)ret >= out_len) {
return -1;
} else {
return ret;
}
}
_public_
int knot_rrtype_from_string(const char *name, uint16_t *num)
{
if (name == NULL || num == NULL) {
return -1;
}
int i;
char *end;
unsigned long n;
// Try to find name in descriptors table.
for (i = 0; i <= MAX_RRTYPE; i++) {
if (rdata_descriptors[i].type_name != NULL &&
strcasecmp(rdata_descriptors[i].type_name, name) == 0) {
*num = i;
return 0;
}
}
// Type name must begin with TYPE.
if (strncasecmp(name, "TYPE", 4) != 0) {
return -1;
} else {
name += 4;
}
// The rest must be a number.
n = strtoul(name, &end, 10);
if (end == name || *end != '\0' || n > UINT16_MAX) {
return -1;
}
*num = n;
return 0;
}
_public_
int knot_rrclass_to_string(const uint16_t rrclass,
char *out,
const size_t out_len)
{
if (out == NULL) {
return -1;
}
int ret;
if (rrclass <= KNOT_CLASS_ANY && dns_classes[rrclass] != NULL) {
ret = snprintf(out, out_len, "%s", dns_classes[rrclass]);
} else {
ret = snprintf(out, out_len, "CLASS%u", rrclass);
}
if (ret <= 0 || (size_t)ret >= out_len) {
return -1;
} else {
return ret;
}
}
_public_
int knot_rrclass_from_string(const char *name, uint16_t *num)
{
if (name == NULL || num == NULL) {
return -1;
}
int i;
char *end;
unsigned long n;
// Try to find the name in classes table.
for (i = 0; i <= KNOT_CLASS_ANY; i++) {
if (dns_classes[i] != NULL &&
strcasecmp(dns_classes[i], name) == 0) {
*num = i;
return 0;
}
}
// Class name must begin with CLASS.
if (strncasecmp(name, "CLASS", 5) != 0) {
return -1;
} else {
name += 5;
}
// The rest must be a number.
n = strtoul(name, &end, 10);
if (end == name || *end != '\0' || n > UINT16_MAX) {
return -1;
}
*num = n;
return 0;
}
_public_
int knot_rrtype_is_metatype(const uint16_t type)
{
return type == KNOT_RRTYPE_SIG ||
type == KNOT_RRTYPE_OPT ||
type == KNOT_RRTYPE_TKEY ||
type == KNOT_RRTYPE_TSIG ||
type == KNOT_RRTYPE_IXFR ||
type == KNOT_RRTYPE_AXFR ||
type == KNOT_RRTYPE_ANY;
}
_public_
int knot_rrtype_is_dnssec(const uint16_t type)
{
return type == KNOT_RRTYPE_DNSKEY ||
type == KNOT_RRTYPE_RRSIG ||
type == KNOT_RRTYPE_NSEC ||
type == KNOT_RRTYPE_NSEC3 ||
type == KNOT_RRTYPE_NSEC3PARAM ||
type == KNOT_RRTYPE_CDNSKEY ||
type == KNOT_RRTYPE_CDS;
}
_public_
int knot_rrtype_additional_needed(const uint16_t type)
{
return type == KNOT_RRTYPE_NS ||
type == KNOT_RRTYPE_MX ||
type == KNOT_RRTYPE_SRV ||
type == KNOT_RRTYPE_SVCB ||
type == KNOT_RRTYPE_HTTPS;
}
_public_
bool knot_rrtype_should_be_lowercased(const uint16_t type)
{
return type == KNOT_RRTYPE_NS ||
type == KNOT_RRTYPE_MD ||
type == KNOT_RRTYPE_MF ||
type == KNOT_RRTYPE_CNAME ||
type == KNOT_RRTYPE_SOA ||
type == KNOT_RRTYPE_MB ||
type == KNOT_RRTYPE_MG ||
type == KNOT_RRTYPE_MR ||
type == KNOT_RRTYPE_PTR ||
type == KNOT_RRTYPE_MINFO ||
type == KNOT_RRTYPE_MX ||
type == KNOT_RRTYPE_RP ||
type == KNOT_RRTYPE_AFSDB ||
type == KNOT_RRTYPE_RT ||
type == KNOT_RRTYPE_SIG ||
type == KNOT_RRTYPE_PX ||
type == KNOT_RRTYPE_NXT ||
type == KNOT_RRTYPE_NAPTR ||
type == KNOT_RRTYPE_KX ||
type == KNOT_RRTYPE_SRV ||
type == KNOT_RRTYPE_DNAME ||
type == KNOT_RRTYPE_RRSIG;
}
_public_
int knot_opt_code_to_string(const uint16_t code, char *out, const size_t out_len)
{
if (out == NULL) {
return -1;
}
const char *name = NULL;
switch (code) {
case 1: name = "LLQ"; break;
case 2: name = "UL"; break;
case 3: name = "NSID"; break;
case 5: name = "DAU"; break;
case 6: name = "DHU"; break;
case 7: name = "N3U"; break;
case 8: name = "EDNS-CLIENT-SUBNET"; break;
case 9: name = "EDNS-EXPIRE"; break;
case 10: name = "COOKIE"; break;
case 11: name = "EDNS-TCP-KEEPALIVE"; break;
case 12: name = "PADDING"; break;
case 13: name = "CHAIN"; break;
case 14: name = "EDNS-KEY-TAG"; break;
}
int ret;
if (name != NULL) {
ret = snprintf(out, out_len, "%s", name);
} else {
ret = snprintf(out, out_len, "CODE%u", code);
}
if (ret <= 0 || (size_t)ret >= out_len) {
return -1;
} else {
return ret;
}
}
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