1 #ifndef foodomainhfoo 2 #define foodomainhfoo 3 4 /*** 5 This file is part of avahi. 6 7 avahi is free software; you can redistribute it and/or modify it 8 under the terms of the GNU Lesser General Public License as 9 published by the Free Software Foundation; either version 2.1 of the 10 License, or (at your option) any later version. 11 12 avahi is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General 15 Public License for more details. 16 17 You should have received a copy of the GNU Lesser General Public 18 License along with avahi; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 20 USA. 21 ***/ 22 23 /** \file domain.h Domain name handling functions */ 24 25 #include <inttypes.h> 26 #include <sys/types.h> 27 28 #include <avahi-common/cdecl.h> 29 30 AVAHI_C_DECL_BEGIN 31 32 /** The maximum length of a a fully escaped domain name C string. This 33 * is calculated like this: RFC1034 mandates maximum length of FQDNs 34 * is 255. The maximum label length is 63. To minimize the number of 35 * (non-escaped) dots, we comprise our maximum-length domain name of 36 * four labels 63 characters plus three inner dots. Escaping the 37 * four labels quadruples their length at maximum. An escaped domain 38 * name has the therefore the maximum length of 63*4*4+3=1011. A 39 * trailing NUL and perhaps two unnecessary dots leading and trailing 40 * the string brings us to 1014. */ 41 #define AVAHI_DOMAIN_NAME_MAX 1014 42 43 /** Maximum size of an unescaped label */ 44 #define AVAHI_LABEL_MAX 64 45 46 /** @{ \name Normalization */ 47 48 /** Normalize a domain name into canonical form. This drops trailing 49 * dots and removes useless backslash escapes. */ 50 char *avahi_normalize_name(const char *s, char *ret_s, size_t size); 51 52 /** Normalize a domain name into canonical form. This drops trailing 53 * dots and removes useless backslash escapes. avahi_free() the 54 * result! */ 55 char *avahi_normalize_name_strdup(const char *s); 56 57 /** @} */ 58 59 /** @{ \name Comparison */ 60 61 /** Return 1 when the specified domain names are equal, 0 otherwise */ 62 int avahi_domain_equal(const char *a, const char *b); 63 64 /** Return some kind of hash value for the domain, useful for using domains as hash table keys. */ 65 unsigned avahi_domain_hash(const char *name); 66 67 /** @} */ 68 69 /** @{ \name Escaping */ 70 71 /** Read the first label from the textual domain name *name, unescape 72 * it and write it to dest, *name is changed to point to the next label*/ 73 char *avahi_unescape_label(const char **name, char *dest, size_t size); 74 75 /** Escape the domain name in *src and write it to *ret_name */ 76 char *avahi_escape_label(const char* src, size_t src_length, char **ret_name, size_t *ret_size); 77 78 /** @} */ 79 80 /** @{ \name Validity Checks */ 81 82 /** Return 1 when the specified string contains a valid generic DNS-SD 83 * service type (i.e. a series of words starting with "_"), 0 84 * otherwise */ 85 int avahi_is_valid_service_type_generic(const char *t); 86 87 /** Return 1 when the specified string contains a valid strict DNS-SD 88 * service type (i.e. consisting of only two words, the latter being 89 * either _udp or _tcp), 0 otherwise */ 90 int avahi_is_valid_service_type_strict(const char *t); 91 92 /** Return 1 when the specified string contains a valid DNS-SD service 93 * subtype, 0 otherwise */ 94 int avahi_is_valid_service_subtype(const char *t); 95 96 /** Return 1 when the specified string contains a valid domain name, 0 otherwise */ 97 int avahi_is_valid_domain_name(const char *t); 98 99 /** Return 1 when the specified string contains a valid DNS-SD service name, 0 otherwise */ 100 int avahi_is_valid_service_name(const char *t); 101 102 /** Return 1 when the specified string contains a valid non-FQDN host name (i.e. without dots), 0 otherwise */ 103 int avahi_is_valid_host_name(const char *t); 104 105 /** Return 1 when the specified string contains a valid FQDN host name (i.e. with more than one label and non-numerical), 0 otherwise. \since 0.6.9 */ 106 int avahi_is_valid_fqdn(const char *t); 107 108 /** @} */ 109 110 /** @{ \name DNS-SD service name handling */ 111 112 /** Construct a valid complete DNS-SD service name from a name, a type and a domain */ 113 int avahi_service_name_join(char *p, size_t size, const char *name, const char *type, const char *domain); 114 115 /** Split a full service name into name, type and domain */ 116 int avahi_service_name_split(const char *p, char *name, size_t name_size, char *type, size_t type_size, char *domain, size_t domain_size); 117 118 /** @} */ 119 120 /** @{ \name DNS-SD Subtype handling */ 121 122 /** Return a pointer to the type section of a subtype i.e. _foo._sub._bar._tcp => _bar._tcp */ 123 const char *avahi_get_type_from_subtype(const char *t); 124 125 /** @} */ 126 127 AVAHI_C_DECL_END 128 129 #endif 130
