/*** This file is part of systemd. Copyright 2014 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #pragma once #include <errno.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include "hashmap.h" #include "in-addr-util.h" /* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ #define DNS_LABEL_MAX 63 /* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) /* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ #define DNS_HOSTNAME_MAX 253 /* Maximum length of a full hostname, on the wire, including the final NUL byte */ #define DNS_WIRE_FOMAT_HOSTNAME_MAX 255 /* Maximum number of labels per valid hostname */ #define DNS_N_LABELS_MAX 127 int dns_label_unescape(const char **name, char *dest, size_t sz); 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); } 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); int dns_name_concat(const char *a, const char *b, char **ret); static inline int dns_name_normalize(const char *s, char **ret) { /* dns_name_concat() normalizes as a side-effect */ return dns_name_concat(s, NULL, ret); } static inline int dns_name_is_valid(const char *s) { int r; /* dns_name_normalize() verifies as a side effect */ r = dns_name_normalize(s, NULL); if (r == -EINVAL) return 0; if (r < 0) return r; return 1; } void dns_name_hash_func(const void *s, struct siphash *state); int dns_name_compare_func(const void *a, const void *b); extern const struct hash_ops dns_name_hash_ops; 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 dns_service_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 **name, char **type, char **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);