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Diffstat (limited to 'src/libknot/descriptor.h')
| -rw-r--r-- | src/libknot/descriptor.h | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/src/libknot/descriptor.h b/src/libknot/descriptor.h new file mode 100644 index 0000000..14cd3b3 --- /dev/null +++ b/src/libknot/descriptor.h @@ -0,0 +1,307 @@ +/* Copyright (C) 2021 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/>. + */ + +/*! + * \file + * + * \brief DNS resource record descriptions. + * + * \addtogroup rr + * @{ + */ + +#pragma once + +#include <stdbool.h> +#include <stddef.h> +#include <stdint.h> + +#define KNOT_MAX_RDATA_BLOCKS 8 +#define KNOT_MAX_RDATA_DNAMES 2 // Update this when defining new RR types! + +/*! + * \brief Resource record class codes. + * + * https://www.iana.org/assignments/dns-parameters/dns-parameters.xml + */ +enum knot_rr_class { + KNOT_CLASS_IN = 1, + KNOT_CLASS_CH = 3, + KNOT_CLASS_NONE = 254, + KNOT_CLASS_ANY = 255 +}; + +/*! + * \brief Resource record type constants. + * + * References: + * https://www.iana.org/assignments/dns-parameters/dns-parameters.xml + * RFC 3597#4 + * + * METATYPE: Contains DNS data that can't be in a zone file. + * QTYPE: Specifies DNS query type; can't be in a zone file. + */ +enum knot_rr_type { + KNOT_RRTYPE_A = 1, /*!< An IPv4 host address. */ + KNOT_RRTYPE_NS = 2, /*!< An authoritative name server. */ + + KNOT_RRTYPE_CNAME = 5, /*!< The canonical name for an alias. */ + KNOT_RRTYPE_SOA = 6, /*!< The start of a zone of authority. */ + + KNOT_RRTYPE_NULL = 10, /*!< METATYPE. Used in RFC 8145. */ + + KNOT_RRTYPE_PTR = 12, /*!< A domain name pointer. */ + KNOT_RRTYPE_HINFO = 13, /*!< A host information. */ + KNOT_RRTYPE_MINFO = 14, /*!< A mailbox information. */ + KNOT_RRTYPE_MX = 15, /*!< Mail exchange. */ + KNOT_RRTYPE_TXT = 16, /*!< Text strings. */ + KNOT_RRTYPE_RP = 17, /*!< For responsible person. */ + KNOT_RRTYPE_AFSDB = 18, /*!< For AFS Data Base location. */ + + KNOT_RRTYPE_RT = 21, /*!< For route through. */ + + KNOT_RRTYPE_SIG = 24, /*!< METATYPE. Transaction signature. */ + KNOT_RRTYPE_KEY = 25, /*!< For security key. */ + + KNOT_RRTYPE_AAAA = 28, /*!< IPv6 address. */ + KNOT_RRTYPE_LOC = 29, /*!< Location information. */ + + KNOT_RRTYPE_SRV = 33, /*!< Server selection. */ + + KNOT_RRTYPE_NAPTR = 35, /*!< Naming authority pointer . */ + KNOT_RRTYPE_KX = 36, /*!< Key exchanger. */ + KNOT_RRTYPE_CERT = 37, /*!< Certificate record. */ + + KNOT_RRTYPE_DNAME = 39, /*!< Delegation name. */ + + KNOT_RRTYPE_OPT = 41, /*!< METATYPE. Option for EDNS. */ + KNOT_RRTYPE_APL = 42, /*!< Address prefix list. */ + KNOT_RRTYPE_DS = 43, /*!< Delegation signer. */ + KNOT_RRTYPE_SSHFP = 44, /*!< SSH public key fingerprint. */ + KNOT_RRTYPE_IPSECKEY = 45, /*!< IPSEC key. */ + KNOT_RRTYPE_RRSIG = 46, /*!< DNSSEC signature. */ + KNOT_RRTYPE_NSEC = 47, /*!< Next-secure record. */ + KNOT_RRTYPE_DNSKEY = 48, /*!< DNS key. */ + KNOT_RRTYPE_DHCID = 49, /*!< DHCP identifier. */ + KNOT_RRTYPE_NSEC3 = 50, /*!< NSEC version 3. */ + KNOT_RRTYPE_NSEC3PARAM = 51, /*!< NSEC3 parameters. */ + KNOT_RRTYPE_TLSA = 52, /*!< DANE record. */ + KNOT_RRTYPE_SMIMEA = 53, /*!< S/MIME cert association. */ + + KNOT_RRTYPE_CDS = 59, /*!< Child delegation signer. */ + KNOT_RRTYPE_CDNSKEY = 60, /*!< Child DNS key. */ + KNOT_RRTYPE_OPENPGPKEY = 61, /*!< OpenPGP Key. */ + KNOT_RRTYPE_CSYNC = 62, /*!< Child-To-Parent synchronization. */ + KNOT_RRTYPE_ZONEMD = 63, /*!< Message digest for DNS zone. */ + KNOT_RRTYPE_SVCB = 64, /*!< Service Binding. */ + KNOT_RRTYPE_HTTPS = 65, /*!< HTTPS Binding. */ + + KNOT_RRTYPE_SPF = 99, /*!< Sender policy framework. */ + + KNOT_RRTYPE_NID = 104, /*!< Node identifier. */ + KNOT_RRTYPE_L32 = 105, /*!< 32-bit network locator. */ + KNOT_RRTYPE_L64 = 106, /*!< 64-bit network locator. */ + KNOT_RRTYPE_LP = 107, /*!< Subnetwork name. */ + KNOT_RRTYPE_EUI48 = 108, /*!< 48-bit extended unique identifier. */ + KNOT_RRTYPE_EUI64 = 109, /*!< 64-bit extended unique identifier. */ + + KNOT_RRTYPE_TKEY = 249, /*!< METATYPE. Transaction key. */ + KNOT_RRTYPE_TSIG = 250, /*!< METATYPE. Transaction signature. */ + KNOT_RRTYPE_IXFR = 251, /*!< QTYPE. Incremental zone transfer. */ + KNOT_RRTYPE_AXFR = 252, /*!< QTYPE. Authoritative zone transfer. */ + + KNOT_RRTYPE_ANY = 255, /*!< QTYPE. Any record. */ + KNOT_RRTYPE_URI = 256, /*!< Uniform resource identifier. */ + KNOT_RRTYPE_CAA = 257, /*!< Certification authority restriction. */ +}; + +/*! + * \brief Some (OBSOLETE) resource record type constants. + * + * References: + * https://www.iana.org/assignments/dns-parameters/dns-parameters.xml + * RFC 3597#4 + * + * \note These records can contain compressed domain name in rdata so + * it is important to know the position of them during transfers. + */ +enum knot_obsolete_rr_type { + KNOT_RRTYPE_MD = 3, + KNOT_RRTYPE_MF = 4, + KNOT_RRTYPE_MB = 7, + KNOT_RRTYPE_MG = 8, + KNOT_RRTYPE_MR = 9, + KNOT_RRTYPE_PX = 26, + KNOT_RRTYPE_NXT = 30 +}; + +/*! + * \brief Constants characterising the wire format of RDATA items. + */ +enum knot_rdata_wireformat { + /*!< Dname must not be compressed. */ + KNOT_RDATA_WF_FIXED_DNAME = -10, + /*!< Dname can be both compressed and decompressed. */ + KNOT_RDATA_WF_COMPRESSIBLE_DNAME, + /*!< Dname can be decompressed. */ + KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME, + /*!< Initial part of NAPTR record before dname. */ + KNOT_RDATA_WF_NAPTR_HEADER, + /*!< Final part of a record. */ + KNOT_RDATA_WF_REMAINDER, + /*!< The last descriptor in array. */ + KNOT_RDATA_WF_END = 0 +}; + +/*! + * \brief Structure describing rdata. + */ +typedef struct { + /*!< Item types describing rdata. */ + const int block_types[KNOT_MAX_RDATA_BLOCKS]; + /*!< RR type name. */ + const char *type_name; +} knot_rdata_descriptor_t; + +/*! + * \brief Gets rdata descriptor for given RR name. + * + * \param type Mnemonic of RR type whose descriptor should be returned. + * + * \retval RR descriptor for given name, NULL descriptor if + * unknown type. + */ +const knot_rdata_descriptor_t *knot_get_rdata_descriptor(const uint16_t type); + +/*! + * \brief Gets rdata descriptor for given RR name (obsolete version). + * + * \param type Mnemonic of RR type whose descriptor should be returned. + * + * \retval RR descriptor for given name, NULL descriptor if + * unknown type. + */ +const knot_rdata_descriptor_t *knot_get_obsolete_rdata_descriptor(const uint16_t type); + +/*! + * \brief Converts numeric type representation to mnemonic string. + * + * \param rrtype Type RR type code to be converted. + * \param out Output buffer. + * \param out_len Length of the output buffer. + * + * \retval Length of output string. + * \retval -1 if error. + */ +int knot_rrtype_to_string(const uint16_t rrtype, + char *out, + const size_t out_len); + +/*! + * \brief Converts mnemonic string representation of a type to numeric one. + * + * \param name Mnemonic string to be converted. + * \param num Output variable. + * + * \retval 0 if OK. + * \retval -1 if error. + */ +int knot_rrtype_from_string(const char *name, uint16_t *num); + +/*! + * \brief Converts numeric class representation to the string one. + * + * \param rrclass Class code to be converted. + * \param out Output buffer. + * \param out_len Length of the output buffer. + * + * \retval Length of output string. + * \retval -1 if error. + */ +int knot_rrclass_to_string(const uint16_t rrclass, + char *out, + const size_t out_len); + +/*! + * \brief Converts string representation of a class to numeric one. + * + * \param name Mnemonic string to be converted. + * \param num Output variable. + * + * \retval 0 if OK. + * \retval -1 if error. + */ +int knot_rrclass_from_string(const char *name, uint16_t *num); + +/*! + * \brief Checks if given item is one of metatypes or qtypes. + * + * \param type Item value. + * + * \retval > 0 if YES. + * \retval 0 if NO. + */ +int knot_rrtype_is_metatype(const uint16_t type); + +/*! + * \brief Checks if given item is one of the DNSSEC types. + * + * \param type Item value. + * + * \retval > 0 if YES. + * \retval 0 if NO. + */ +int knot_rrtype_is_dnssec(const uint16_t type); + +/*! + * \brief Checks whether the given type requires additional processing. + * + * Only MX, NS and SRV types require additional processing. + * + * \param type Type to check. + * + * \retval <> 0 if additional processing is needed for \a qtype. + * \retval 0 otherwise. + */ +int knot_rrtype_additional_needed(const uint16_t type); + +/*! + * \brief Checks whether the RDATA domain names should be lowercased in + * canonical format of RRSet of the given type. + * + * Types that should be lowercased are according to RFC 4034, Section 6.2, + * except for NSEC (updated by RFC 6840, Section 5.1) and A6 (not supported). + * + * \param type RRSet type to check. + * + * \retval true If RDATA dnames for type should be lowercased in canonical format. + * \retval false Otherwise. + */ +bool knot_rrtype_should_be_lowercased(const uint16_t type); + +/*! + * \brief Translates option code to string. + * + * \param code Code of the option to translate. + * \param out Buffer for the output string. + * \param out_len The available size of the buffer. + * + * \retval Length of output string. + * \retval -1 if error. + */ +int knot_opt_code_to_string(const uint16_t code, char *out, const size_t out_len); + +/*! @} */ |