/*
 * Part of DNS zone file validator `validns`.
 *
 * Copyright 2025-2026 OARC, Inc.
 * Copyright 2011-2025 Anton Berezin <tobez@tobez.org>
 * Modified BSD license.
 * (See LICENSE file in the distribution.)
 *
 */
#ifndef _RR_H
#define _RR_H 1

#define T_A 1
#define T_NS 2
#define T_CNAME 5
#define T_SOA 6
#define T_MB 7
#define T_MG 8
#define T_MR 9
#define T_PTR 12
#define T_HINFO 13
#define T_MINFO 14
#define T_MX 15
#define T_TXT 16
#define T_RP 17
#define T_AFSDB 18
#define T_X25 19
#define T_ISDN 20
#define T_RT 21
#define T_NSAP 22
#define T_PX 26
#define T_AAAA 28
#define T_LOC 29
#define T_SRV 33
#define T_NAPTR 35
#define T_KX 36
#define T_CERT 37
#define T_DNAME 39
#define T_DS 43
#define T_SSHFP 44
#define T_IPSECKEY 45
#define T_RRSIG 46
#define T_NSEC 47
#define T_DNSKEY 48
#define T_DHCID 49
#define T_NSEC3 50
#define T_NSEC3PARAM 51
#define T_TLSA 52
#define T_SMIMEA 53
#define T_CDS 59
#define T_CDNSKEY 60
#define T_ZONEMD 63
#define T_SVCB 64
#define T_HTTPS 65
#define T_SPF 99
#define T_NID 104
#define T_L32 105
#define T_L64 106
#define T_LP 107
#define T_CAA 257
#define T_WALLET 262
#define T_DLV 32769
#define T_MAX 32769

#define ALG_DSA 3
#define ALG_RSASHA1 5
#define ALG_DSA_NSEC3_SHA1 6
#define ALG_RSASHA1_NSEC3_SHA1 7
#define ALG_RSASHA256 8
#define ALG_RSASHA512 10
#define ALG_ECCGOST 12
#define ALG_ECDSAP256SHA256 13
#define ALG_ECDSAP384SHA384 14
#define ALG_ED25519 15
#define ALG_ED448 16
#define ALG_PRIVATEDNS 253
#define ALG_PRIVATEOID 254

#define ALG_UNSUPPORTED 0
#define ALG_DSA_FAMILY 1
#define ALG_RSA_FAMILY 2
#define ALG_PRIVATE_FAMILY 3
#define ALG_ECC_FAMILY 4

#define RRCAST(t) struct rr_##t* rr = (struct rr_##t*)rrv

struct cbtree;
extern struct cbtree zone_data;
extern char*         zone_apex;
extern int           zone_apex_l;

struct named_rr;
struct rr_set;
struct rr;

typedef struct rr* (*rr_parse_func)(char*, long, int, char*);
typedef char* (*rr_human_func)(struct rr*);
typedef struct binary_data (*rr_wire_func)(struct rr*);
typedef void* (*rr_validate_set_func)(struct rr_set*);
typedef void* (*rr_validate_func)(struct rr*);
struct rr_methods {
    rr_parse_func        rr_parse;
    rr_human_func        rr_human;
    rr_wire_func         rr_wire;
    rr_validate_set_func rr_validate_set;
    rr_validate_func     rr_validate;
};
extern struct rr_methods rr_methods[T_MAX + 1];
extern struct rr_methods unknown_methods;
extern int               rr_counts[T_MAX + 1];

struct binary_data call_get_wired(struct rr* rr);
struct rr*         rr_parse_any(char* name, long ttl, int type, char* s);
char*              any_human(struct rr* rrv);
struct binary_data any_wirerdata(struct rr* rrv);

int                name_belongs_to_zone(const char* name);
void               validate_record(struct rr* rr);
void               validate_zone(void);
struct rr*         store_record(int rdtype, char* name, long ttl, void* rrptr);
int                str2rdtype(char* rdtype, int* is_generic);
char*              rdtype2str(int type);
struct named_rr*   find_named_rr(char* name);
struct named_rr*   find_next_named_rr(struct named_rr* named_rr);
struct rr_set*     find_rr_set(int rdtype, char* name);
struct rr_set*     find_rr_set_in_named_rr(struct named_rr* named_rr, int rdtype);
uint32_t           get_rr_set_count(struct named_rr* named_rr);
struct binary_data name2wire_name(char* s);
int                algorithm_type(int alg);
#define ALG_FLAG_UNKNOWN 1 /* algorithm number not recognized by validns */
#define ALG_FLAG_POLICY_OFF 2 /* recognized but digest disabled by system crypto policy */

/* Returns the parsed algorithm integer (>= 0), or -1 on parse failure
 * (no integer/label readable, or an unrecognized mnemonic — both already
 * bitched). On success, *flags is set to a bitmask of ALG_FLAG_*. flags == 0
 * means usable. ALG_FLAG_POLICY_OFF is accompanied by the existing one-shot
 * global crypto-policy warning emitted from check_algorithm_available.
 * extract_algorithm itself does NOT emit "bad or unsupported algorithm N"
 * for numeric input — callers decide what to print based on *flags. */
int extract_algorithm(char** s, char* what, int* flags);

#define NAME_FLAG_APEX 1
#define NAME_FLAG_HAS_RECORDS 2
#define NAME_FLAG_DELEGATION 4
#define NAME_FLAG_NOT_AUTHORITATIVE 8
#define NAME_FLAG_NSEC3_ONLY 16
#define NAME_FLAG_KIDS_WITH_RECORDS 32
#define NAME_FLAG_SIGNED_DELEGATION 64
#define NAME_FLAG_APEX_PARENT 128
#define NAME_FLAG_THIS_WITH_RECORDS 256
#define NAME_FLAG_CONTAINS_SLASH 512

struct named_rr {
    char* name;
    void* rr_sets;

    int              line;
    char*            file_name;
    uint32_t         flags;
    struct named_rr* parent;
};

struct rr_set {
    struct rr*       head;
    struct rr*       tail;
    struct named_rr* named_rr;
    int              rdtype;
    int              count;
};

struct rr {
    struct rr*     next;
    struct rr*     prev;
    struct rr_set* rr_set;

    int ttl;
    int rdtype;

    int   line;
    int   is_generic;
    char* file_name;
};

struct rr_any {
    struct rr          rr;
    struct binary_data data;
};

struct rr_a {
    struct rr      rr;
    struct in_addr address;
};
extern struct rr_methods a_methods;

struct rr_soa {
    struct rr rr;
    uint32_t  serial;
    int       refresh, retry, expire, minimum;
    char*     rname;
    char*     mname;
};
extern struct rr_methods soa_methods;

struct rr_ns {
    struct rr rr;
    char*     nsdname;
};
extern struct rr_methods ns_methods;

struct rr_dhcid {
    struct rr          rr;
    int                id_type;
    int                digest_type;
    struct binary_data digest;
};
extern struct rr_methods dhcid_methods;

struct rr_txtlike_segment {
    struct binary_data         txt;
    struct rr_txtlike_segment* next;
};
struct rr_txtlike {
    struct rr                  rr;
    int                        count;
    struct rr_txtlike_segment* txt;
};
extern struct rr_methods txt_methods;
extern struct rr_methods spf_methods;
extern struct rr_methods wallet_methods;

struct rr_tlsa_smimea {
    struct rr          rr;
    uint8_t            cert_usage;
    uint8_t            selector;
    uint8_t            matching_type;
    struct binary_data association_data;
};
extern struct rr_methods tlsa_methods;
extern struct rr_methods smimea_methods;

struct rr_ipseckey {
    struct rr rr;
    uint8_t   precedence;
    uint8_t   gateway_type;
    uint8_t   algorithm;
    union {
        char*           gateway_none; /* gateway_type == 0 */
        struct in_addr  gateway_ipv4; /* gateway_type == 1 */
        struct in6_addr gateway_ipv6; /* gateway_type == 2 */
        char*           gateway_name; /* gateway_type == 3 */
    } gateway;
    struct binary_data public_key;
};
extern struct rr_methods ipseckey_methods;

struct rr_nid {
    struct rr rr;
    uint16_t  preference;
    uint64_t  node_id;
};
extern struct rr_methods nid_methods;

struct rr_l32 {
    struct rr rr;
    uint16_t  preference;
    uint32_t  locator32;
};
extern struct rr_methods l32_methods;

struct rr_l64 {
    struct rr rr;
    uint16_t  preference;
    uint64_t  locator64;
};
extern struct rr_methods l64_methods;

struct rr_lp {
    struct rr rr;
    uint16_t  preference;
    char*     fqdn;
};
extern struct rr_methods lp_methods;

struct rr_naptr {
    struct rr          rr;
    uint16_t           order;
    uint16_t           preference;
    struct binary_data flags;
    struct binary_data services;
    struct binary_data regexp;
    char*              replacement;
};
extern struct rr_methods naptr_methods;

struct rr_nsec {
    struct rr          rr;
    char*              next_domain;
    struct binary_data type_bitmap;
};
extern struct rr_methods nsec_methods;

void validate_nsec_chain(void);

struct rr_nsec3 {
    struct rr          rr;
    uint8_t            hash_algorithm;
    uint8_t            flags;
    uint16_t           iterations;
    struct binary_data salt;
    struct binary_data next_hashed_owner;
    struct binary_data type_bitmap;
    struct binary_data this_hashed_name;
    struct named_rr*   corresponding_name;
    struct rr_nsec3*   next_nsec3;
};
extern struct rr_methods nsec3_methods;

struct rr_nsec3param {
    struct rr          rr;
    uint8_t            hash_algorithm;
    uint8_t            flags;
    uint16_t           iterations;
    struct binary_data salt;
};
extern struct rr_methods nsec3param_methods;
extern struct rr*        nsec3param;

struct rr_rrsig {
    struct rr          rr;
    uint16_t           type_covered;
    int                algorithm;
    int                labels;
    int                orig_ttl;
    uint32_t           sig_expiration;
    uint32_t           sig_inception;
    uint16_t           key_tag;
    char*              signer;
    struct binary_data signature;
};
extern struct rr_methods rrsig_methods;

struct rr_srv {
    struct rr rr;
    uint16_t  priority;
    uint16_t  weight;
    uint16_t  port;
    char*     target;
};
extern struct rr_methods srv_methods;

struct rr_cname {
    struct rr rr;
    char*     cname;
};
extern struct rr_methods cname_methods;

struct rr_mb {
    struct rr rr;
    char*     madname;
};
extern struct rr_methods mb_methods;

struct rr_mg {
    struct rr rr;
    char*     mgmname;
};
extern struct rr_methods mg_methods;

struct rr_minfo {
    struct rr rr;
    char*     rmailbx;
    char*     emailbx;
};
extern struct rr_methods minfo_methods;

struct rr_mr {
    struct rr rr;
    char*     newname;
};
extern struct rr_methods mr_methods;

struct rr_dname {
    struct rr rr;
    char*     target;
};
extern struct rr_methods dname_methods;

struct rr_aaaa {
    struct rr       rr;
    struct in6_addr address;
};
extern struct rr_methods aaaa_methods;

struct rr_mx {
    struct rr rr;
    int       preference;
    char*     exchange;
};
extern struct rr_methods mx_methods;

struct rr_rt {
    struct rr rr;
    int       preference;
    char*     intermediate_host;
};
extern struct rr_methods rt_methods;

struct rr_afsdb {
    struct rr rr;
    int       subtype;
    char*     hostname;
};
extern struct rr_methods afsdb_methods;

struct rr_x25 {
    struct rr          rr;
    struct binary_data psdn_address;
};
extern struct rr_methods x25_methods;

struct rr_isdn {
    struct rr          rr;
    struct binary_data isdn_address;
    struct binary_data sa;
    int                sa_present;
};
extern struct rr_methods isdn_methods;

struct rr_px {
    struct rr rr;
    int       preference;
    char*     map822;
    char*     mapx400;
};
extern struct rr_methods px_methods;

struct rr_kx {
    struct rr rr;
    int       preference;
    char*     exchanger;
};
extern struct rr_methods kx_methods;

struct rr_dnskey {
    struct rr          rr;
    uint16_t           flags;
    uint8_t            protocol;
    uint8_t            algorithm;
    struct binary_data pubkey;
    /* calculated */
    uint16_t key_tag;
    int      pkey_built;
    void*    pkey;
    /* extras */
    int               key_type;
    struct rr_dnskey* next_key;
};
extern struct rr_methods dnskey_methods;
extern struct rr_methods cdnskey_methods;

#define KEY_TYPE_UNUSED 0
#define KEY_TYPE_KSK 1
#define KEY_TYPE_ZSK 2

int  dnskey_build_pkey(struct rr_dnskey* rr);
void dnskey_ksk_policy_check(void);

struct rr_ds {
    struct rr          rr;
    uint16_t           key_tag;
    uint8_t            algorithm;
    uint8_t            digest_type;
    struct binary_data digest;
};
extern struct rr_methods ds_methods;
extern struct rr_methods cds_methods;

struct rr_dlv {
    struct rr          rr;
    uint16_t           key_tag;
    uint8_t            algorithm;
    uint8_t            digest_type;
    struct binary_data digest;
};
extern struct rr_methods dlv_methods;

struct rr_nsap {
    struct rr          rr;
    struct binary_data data;
};
extern struct rr_methods nsap_methods;

struct rr_hinfo {
    struct rr          rr;
    struct binary_data cpu;
    struct binary_data os;
};
extern struct rr_methods hinfo_methods;

struct rr_rp {
    struct rr rr;
    char*     mbox_dname;
    char*     txt_dname;
};
extern struct rr_methods rp_methods;

struct rr_loc {
    struct rr rr;
    uint8_t   version;
    uint8_t   size;
    uint8_t   horiz_pre;
    uint8_t   vert_pre;
    uint32_t  latitude;
    uint32_t  longitude;
    uint32_t  altitude;
};
extern struct rr_methods loc_methods;

struct rr_ptr {
    struct rr rr;
    char*     ptrdname;
};
extern struct rr_methods ptr_methods;

struct rr_sshfp {
    struct rr          rr;
    uint8_t            algorithm;
    uint8_t            fp_type;
    struct binary_data fingerprint;
};
extern struct rr_methods sshfp_methods;

struct rr_cert {
    struct rr          rr;
    uint16_t           type;
    uint16_t           key_tag;
    int                algorithm;
    struct binary_data certificate;
};
extern struct rr_methods cert_methods;

struct rr_caa {
    struct rr          rr;
    uint8_t            flags;
    struct binary_data tag;
    struct binary_data value;
};
extern struct rr_methods caa_methods;

/* RFC 9460 §14.3 SvcParamKey registry */
#define SVCB_KEY_MANDATORY 0
#define SVCB_KEY_ALPN 1
#define SVCB_KEY_NO_DEFAULT_ALPN 2
#define SVCB_KEY_PORT 3
#define SVCB_KEY_IPV4HINT 4
#define SVCB_KEY_ECH 5
#define SVCB_KEY_IPV6HINT 6
#define SVCB_KEY_DOHPATH 7
#define SVCB_KEY_OHTTP 8

struct svcb_alpn {
    int                 count;
    struct binary_data* ids;
};

struct svcb_keylist {
    int       count;
    uint16_t* keys;
};

struct svcb_param {
    uint16_t key;
    union {
        struct svcb_alpn alpn;
        uint16_t         port;
        struct {
            int             count;
            struct in_addr* addrs;
        } ipv4hint;
        struct binary_data ech;
        struct {
            int              count;
            struct in6_addr* addrs;
        } ipv6hint;
        struct binary_data  dohpath;
        struct svcb_keylist mandatory;
        struct binary_data  generic;
    } v;
};

struct rr_svcb {
    struct rr          rr;
    uint16_t           priority;
    char*              target;
    int                n_params;
    struct svcb_param* params;
};
extern struct rr_methods svcb_methods;

struct rr_zonemd {
    struct rr          rr;
    uint32_t           serial;
    uint8_t            scheme;
    uint8_t            hash_algorithm;
    struct binary_data digest;
};
extern struct rr_methods zonemd_methods;

extern struct rr_nsec3* first_nsec3;
extern struct rr_nsec3* latest_nsec3;

extern void  verify_all_keys(void);
extern void* nsec3_validate(struct rr* rrv);
extern void* remember_nsec3(char* name, struct rr_nsec3* rr);
extern void  perform_remaining_nsec3checks(void);
extern void* check_typemap(struct binary_data type_bitmap, struct named_rr* named_rr, struct rr* reference_rr);

#endif
