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-rw-r--r--src/libknot/descriptor.c425
1 files changed, 425 insertions, 0 deletions
diff --git a/src/libknot/descriptor.c b/src/libknot/descriptor.c
new file mode 100644
index 0000000..5ff2714
--- /dev/null
+++ b/src/libknot/descriptor.c
@@ -0,0 +1,425 @@
+/* Copyright (C) 2019 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" },
+};
+
+#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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