/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include <errno.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include "dns-def.h" #include "hashmap.h" #include "in-addr-util.h" typedef enum DNSLabelFlags { DNS_LABEL_LDH = 1 << 0, /* Follow the "LDH" rule — only letters, digits, and internal hyphens. */ DNS_LABEL_NO_ESCAPES = 1 << 1, /* Do not treat backslashes specially */ DNS_LABEL_LEAVE_TRAILING_DOT = 1 << 2, /* Leave trailing dot in place */ } DNSLabelFlags; int dns_label_unescape(const char **name, char *dest, size_t sz, DNSLabelFlags flags); int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); int dns_label_escape_new(const char *p, size_t l, char **ret); static inline int dns_name_parent(const char **name) { return dns_label_unescape(name, NULL, DNS_LABEL_MAX, 0); } #if HAVE_LIBIDN int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); #endif int dns_name_concat(const char *a, const char *b, DNSLabelFlags flags, char **ret); static inline int dns_name_normalize(const char *s, DNSLabelFlags flags, char **ret) { /* dns_name_concat() normalizes as a side-effect */ return dns_name_concat(s, NULL, flags, ret); } static inline int dns_name_is_valid(const char *s) { int r; /* dns_name_concat() verifies as a side effect */ r = dns_name_concat(s, NULL, 0, NULL); if (r == -EINVAL) return 0; if (r < 0) return r; return 1; } static inline int dns_name_is_valid_ldh(const char *s) { int r; r = dns_name_concat(s, NULL, DNS_LABEL_LDH|DNS_LABEL_NO_ESCAPES, NULL); if (r == -EINVAL) return 0; if (r < 0) return r; return 1; } void dns_name_hash_func(const char *s, struct siphash *state); int dns_name_compare_func(const char *a, const char *b); extern const struct hash_ops dns_name_hash_ops; extern const struct hash_ops dns_name_hash_ops_free; int dns_name_between(const char *a, const char *b, const char *c); int dns_name_equal(const char *x, const char *y); int dns_name_endswith(const char *name, const char *suffix); int dns_name_startswith(const char *name, const char *prefix); int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); int dns_name_reverse(int family, const union in_addr_union *a, char **ret); int dns_name_address(const char *p, int *family, union in_addr_union *a); bool dns_name_is_root(const char *name); bool dns_name_is_single_label(const char *name); int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); bool dns_srv_type_is_valid(const char *name); bool dnssd_srv_type_is_valid(const char *name); bool dns_service_name_is_valid(const char *name); bool dns_subtype_name_is_valid(const char *name); int dns_service_join(const char *name, const char *type, const char *domain, char **ret); int dns_service_split(const char *joined, char **ret_name, char **ret_type, char **ret_domain); int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); int dns_name_count_labels(const char *name); int dns_name_skip(const char *a, unsigned n_labels, const char **ret); int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b); int dns_name_common_suffix(const char *a, const char *b, const char **ret); int dns_name_apply_idna(const char *name, char **ret); int dns_name_is_valid_or_address(const char *name); int dns_name_dot_suffixed(const char *name); bool dns_name_dont_resolve(const char *name);