Struct trust_dns_proto::rr::LowerName

pub struct LowerName(/* private fields */);

TODO: all LowerNames should be stored in a global “intern” space, and then everything that uses them should be through references. As a workaround the Strings are all Rc as well as the array

Implementations

impl LowerName

pub fn new(name: &Name) -> Self

Create a new domain::LowerName, i.e. label

pub fn is_root(&self) -> bool

Returns true if there are no labels, i.e. it’s empty.

In DNS the root is represented by .

Examples

use trust_dns_proto::rr::{LowerName, Name};

let root = LowerName::from(Name::root());
assert_eq!(&root.to_string(), ".");

pub fn is_fqdn(&self) -> bool

Returns true if the name is a fully qualified domain name.

If this is true, it has effects like only querying for this single name, as opposed to building up a search list in resolvers.

warning: this interface is unstable and may change in the future

Examples

use std::str::FromStr;
use trust_dns_proto::rr::{LowerName, Name};

let name = LowerName::from(Name::from_str("www").unwrap());
assert!(!name.is_fqdn());

let name = LowerName::from(Name::from_str("www.example.com").unwrap());
assert!(!name.is_fqdn());

let name = LowerName::from(Name::from_str("www.example.com.").unwrap());
assert!(name.is_fqdn());

pub fn base_name(&self) -> Self

Trims off the first part of the name, to help with searching for the domain piece

Examples

use std::str::FromStr;
use trust_dns_proto::rr::{LowerName, Name};

let example_com = LowerName::from(Name::from_str("example.com").unwrap());
assert_eq!(example_com.base_name(), LowerName::from(Name::from_str("com.").unwrap()));
assert_eq!(LowerName::from(Name::from_str("com.").unwrap().base_name()), LowerName::from(Name::root()));
assert_eq!(LowerName::from(Name::root().base_name()), LowerName::from(Name::root()));

pub fn zone_of(&self, name: &Self) -> bool

returns true if the name components of self are all present at the end of name

Example

use std::str::FromStr;
use trust_dns_proto::rr::{LowerName, Name};

let name = LowerName::from(Name::from_str("www.example.com").unwrap());
let zone = LowerName::from(Name::from_str("example.com").unwrap());
let another = LowerName::from(Name::from_str("example.net").unwrap());
assert!(zone.zone_of(&name));
assert!(!another.zone_of(&name));

pub fn num_labels(&self) -> u8

Returns the number of labels in the name, discounting *.

Examples

use std::str::FromStr;
use trust_dns_proto::rr::{LowerName, Name};

let root = LowerName::from(Name::root());
assert_eq!(root.num_labels(), 0);

let example_com = LowerName::from(Name::from_str("example.com").unwrap());
assert_eq!(example_com.num_labels(), 2);

let star_example_com = LowerName::from(Name::from_str("*.example.com").unwrap());
assert_eq!(star_example_com.num_labels(), 2);

pub fn len(&self) -> usize

returns the length in bytes of the labels. ‘.’ counts as 1

This can be used as an estimate, when serializing labels, they will often be compressed and/or escaped causing the exact length to be different.

pub fn is_empty(&self) -> bool

Returns true if the name is empty

pub fn emit_as_canonical( &self, encoder: &mut BinEncoder<'_>, canonical: bool, ) -> ProtoResult<()>

Emits the canonical version of the name to the encoder.

In canonical form, there will be no pointers written to the encoder (i.e. no compression).

pub fn is_wildcard(&self) -> bool

Pass through for Name::is_wildcard

pub fn into_wildcard(self) -> Self

Replaces the first label with the wildcard character, “*”

Trait Implementations

impl<'r> BinDecodable<'r> for LowerName

fn read(decoder: &mut BinDecoder<'r>) -> ProtoResult<Self>

parses the chain of labels this has a max of 255 octets, with each label being less than 63. all names will be stored lowercase internally. This will consume the portions of the Vec which it is reading…

fn from_bytes(bytes: &'r [u8]) -> ProtoResult<Self>

Returns the object in binary form

impl BinEncodable for LowerName

fn emit(&self, encoder: &mut BinEncoder<'_>) -> ProtoResult<()>

Write the type to the stream

fn to_bytes(&self) -> ProtoResult<Vec<u8>>

Returns the object in binary form

impl Borrow<Name> for LowerName

fn borrow(&self) -> &Name

Immutably borrows from an owned value.

impl Clone for LowerName

fn clone(&self) -> LowerName

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LowerName

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LowerName

fn default() -> LowerName

Returns the “default value” for a type.

impl Display for LowerName

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> From<&'a LowerName> for Name

fn from(name: &'a LowerName) -> Self

Converts to this type from the input type.

impl<'a> From<&'a Name> for LowerName

fn from(name: &'a Name) -> Self

Converts to this type from the input type.

impl From<LowerName> for Name

fn from(name: LowerName) -> Self

Converts to this type from the input type.

impl From<Name> for LowerName

fn from(name: Name) -> Self

Converts to this type from the input type.

impl FromStr for LowerName

type Err = ProtoError

The associated error which can be returned from parsing.

fn from_str(name: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for LowerName

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for LowerName

fn cmp(&self, other: &Self) -> Ordering

Given two lower cased names, this performs a case sensitive comparison.

RFC 4034                DNSSEC Resource Records               March 2005

6.1.  Canonical DNS LowerName Order

 For the purposes of DNS security, owner names are ordered by treating
 individual labels as unsigned left-justified octet strings.  The
 absence of a octet sorts before a zero value octet, and uppercase
 US-ASCII letters are treated as if they were lowercase US-ASCII
 letters.

 To compute the canonical ordering of a set of DNS names, start by
 sorting the names according to their most significant (rightmost)
 labels.  For names in which the most significant label is identical,
 continue sorting according to their next most significant label, and
 so forth.

 For example, the following names are sorted in canonical DNS name
 order.  The most significant label is "example".  At this level,
 "example" sorts first, followed by names ending in "a.example", then
 by names ending "z.example".  The names within each level are sorted
 in the same way.

           example
           a.example
           yljkjljk.a.example
           Z.a.example
           zABC.a.EXAMPLE
           z.example
           \001.z.example
           *.z.example
           \200.z.example

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for LowerName

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for LowerName

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for LowerName