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Diffstat (limited to '')
| -rw-r--r-- | src/libknot/descriptor.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/src/libknot/descriptor.c b/src/libknot/descriptor.c new file mode 100644 index 0000000..fa3bbd6 --- /dev/null +++ b/src/libknot/descriptor.c @@ -0,0 +1,411 @@ +/* Copyright (C) 2018 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 <http://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_CDS] = { { KNOT_RDATA_WF_REMAINDER, + KNOT_RDATA_WF_END }, "CDS" }, + [KNOT_RRTYPE_CDNSKEY] = { { KNOT_RDATA_WF_REMAINDER, + KNOT_RDATA_WF_END }, "CDNSKEY" }, + [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; +} + +_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; + } +} |