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ipv4_cidr.rs
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ipv4_cidr.rs
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use std::cmp::Ordering;
use std::convert::TryFrom;
use std::fmt::{self, Debug, Display, Formatter};
use std::net::Ipv4Addr;
use std::str::FromStr;
use once_cell::sync::Lazy;
use regex::Regex;
#[cfg(feature = "serde")]
use serde::ser::{Serialize, Serializer};
#[cfg(feature = "serde")]
use serde::de::{Deserialize, Deserializer, Error as DeError, Visitor};
use super::functions::*;
use super::{Ipv4Able, Ipv4CidrError};
static RE_IPV4_CIDR: Lazy<Regex> = Lazy::new(|| {
Regex::new(r"^(?:(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])(?:\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])(?:\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])(?:\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9]))?)?)?)(?:/(?:([0-9]|30|31|32|(?:[1-2][0-9]))|(?:(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|1(?:[0-9]){1,2}|[1-9]?[0-9]))))?$").unwrap()
});
/// To represent IPv4 CIDR.
#[derive(Copy, Clone, Eq, PartialEq, Hash)]
pub struct Ipv4Cidr {
prefix: u32,
mask: u32,
}
impl Ipv4Cidr {
#[inline]
/// Get an integer which represents the prefix an IPv4 byte array of this CIDR in big-endian (BE) order.
pub fn get_prefix(&self) -> u32 {
self.prefix
}
#[inline]
pub fn get_prefix_as_u8_array(&self) -> [u8; 4] {
self.get_prefix().to_be_bytes()
}
#[inline]
pub fn get_prefix_as_ipv4_addr(&self) -> Ipv4Addr {
let a = self.get_prefix_as_u8_array();
Ipv4Addr::new(a[0], a[1], a[2], a[3])
}
#[inline]
pub fn get_bits(&self) -> u8 {
mask_to_bits(self.mask).unwrap()
}
#[inline]
/// Get an integer which represents the mask an IPv4 byte array of this CIDR in big-endian (BE) order.
pub fn get_mask(&self) -> u32 {
get_mask(self.get_bits())
}
#[inline]
pub fn get_mask_as_u8_array(&self) -> [u8; 4] {
self.get_mask().to_be_bytes()
}
#[inline]
pub fn get_mask_as_ipv4_addr(&self) -> Ipv4Addr {
let a = self.get_mask_as_u8_array();
Ipv4Addr::new(a[0], a[1], a[2], a[3])
}
}
impl Ipv4Cidr {
#[inline]
pub fn from_prefix_and_bits<P: Ipv4Able>(
prefix: P,
bits: u8,
) -> Result<Ipv4Cidr, Ipv4CidrError> {
if bits > 32 {
return Err(Ipv4CidrError::IncorrectBitsRange);
}
let mask = get_mask(bits);
let prefix = prefix.get_u32() & mask;
Ok(Ipv4Cidr {
prefix,
mask,
})
}
#[inline]
pub fn from_prefix_and_mask<P: Ipv4Able, M: Ipv4Able>(
prefix: P,
mask: M,
) -> Result<Ipv4Cidr, Ipv4CidrError> {
let mask = mask.get_u32();
match mask_to_bits(mask) {
Some(_) => {
let prefix = prefix.get_u32() & mask;
Ok(Ipv4Cidr {
prefix,
mask,
})
}
None => Err(Ipv4CidrError::IncorrectMask),
}
}
#[allow(clippy::should_implement_trait)]
pub fn from_str<S: AsRef<str>>(s: S) -> Result<Ipv4Cidr, Ipv4CidrError> {
let s = s.as_ref();
match RE_IPV4_CIDR.captures(s) {
Some(c) => {
let mut prefix = [0u8; 4];
let mut prefer_bits = None;
prefix[0] = c.get(1).unwrap().as_str().parse().unwrap();
for (i, p) in prefix[1..].iter_mut().enumerate() {
match c.get(i + 2).map(|m| m.as_str().parse().unwrap()) {
Some(n) => {
*p = n;
}
None => {
prefer_bits = Some(8 * (i as u8 + 1));
break;
}
}
}
if let Some(m) = c.get(5) {
let bits = m.as_str().parse().unwrap();
if let Some(prefer_bits) = prefer_bits {
if bits != prefer_bits {
return Err(Ipv4CidrError::IncorrectIpv4CIDRString);
}
}
Ok(Ipv4Cidr::from_prefix_and_bits(prefix, bits)?)
} else if let Some(m) = c.get(6) {
let mut mask = [0u8; 4];
mask[0] = m.as_str().parse().unwrap();
mask[1] = c.get(7).unwrap().as_str().parse().unwrap();
mask[2] = c.get(8).unwrap().as_str().parse().unwrap();
mask[3] = c.get(9).unwrap().as_str().parse().unwrap();
match mask_to_bits(u32::from_be_bytes(mask)) {
Some(bits) => {
if let Some(prefer_bits) = prefer_bits {
if bits != prefer_bits {
return Err(Ipv4CidrError::IncorrectIpv4CIDRString);
}
}
Ipv4Cidr::from_prefix_and_mask(prefix, mask)
}
None => Err(Ipv4CidrError::IncorrectIpv4CIDRString),
}
} else {
Ipv4Cidr::from_prefix_and_bits(prefix, prefer_bits.unwrap_or(32))
}
}
None => Err(Ipv4CidrError::IncorrectIpv4CIDRString),
}
}
#[inline]
pub fn is_ipv4_cidr<S: AsRef<str>>(s: S) -> bool {
Self::from_str(s).is_ok()
}
}
impl Ipv4Cidr {
#[inline]
/// Get an integer which represents the first IPv4 byte array of this CIDR in big-endian (BE) order.
pub fn first(&self) -> u32 {
self.get_prefix()
}
#[inline]
pub fn first_as_u8_array(&self) -> [u8; 4] {
self.get_prefix_as_u8_array()
}
#[inline]
pub fn first_as_ipv4_addr(&self) -> Ipv4Addr {
self.get_prefix_as_ipv4_addr()
}
#[inline]
/// Get an integer which represents the last IPv4 byte array of this CIDR in big-endian (BE) order.
pub fn last(&self) -> u32 {
!self.get_mask() | self.get_prefix()
}
#[inline]
pub fn last_as_u8_array(&self) -> [u8; 4] {
self.last().to_be_bytes()
}
#[inline]
pub fn last_as_ipv4_addr(&self) -> Ipv4Addr {
let a = self.last_as_u8_array();
Ipv4Addr::new(a[0], a[1], a[2], a[3])
}
#[inline]
pub fn size(&self) -> u64 {
2u64.pow(u32::from(32 - self.get_bits()))
}
}
impl Ipv4Cidr {
#[inline]
pub fn contains<IP: Ipv4Able>(&self, ipv4: IP) -> bool {
let mask = self.get_mask();
ipv4.get_u32() & mask == self.prefix
}
}
impl Debug for Ipv4Cidr {
#[inline]
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
let prefix = self.get_prefix_as_ipv4_addr();
let mask = self.get_mask_as_ipv4_addr();
let bits = self.get_bits();
debug_helper::impl_debug_for_struct!(Ipv4Cidr, f, self, let .prefix = prefix, let .mask = mask, let .bits = bits);
}
}
impl Display for Ipv4Cidr {
#[inline]
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
let prefix = self.get_prefix_as_ipv4_addr();
let bits = self.get_bits();
f.write_fmt(format_args!("{prefix}/{bits}"))
}
}
impl PartialOrd for Ipv4Cidr {
#[inline]
fn partial_cmp(&self, other: &Ipv4Cidr) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Ipv4Cidr {
#[inline]
fn cmp(&self, other: &Ipv4Cidr) -> Ordering {
let a = self.first_as_u8_array();
let b = other.first_as_u8_array();
for i in 0..4 {
let cmp_result = a[i].cmp(&b[i]);
if cmp_result != Ordering::Equal {
return cmp_result;
}
}
self.get_bits().cmp(&other.get_bits())
}
}
impl FromStr for Ipv4Cidr {
type Err = Ipv4CidrError;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
Ipv4Cidr::from_str(s)
}
}
impl TryFrom<&str> for Ipv4Cidr {
type Error = Ipv4CidrError;
#[inline]
fn try_from(s: &str) -> Result<Self, Self::Error> {
Ipv4Cidr::from_str(s)
}
}
#[cfg(feature = "serde")]
impl Serialize for Ipv4Cidr {
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer, {
serializer.serialize_str(self.to_string().as_str())
}
}
#[cfg(feature = "serde")]
impl<'de> Deserialize<'de> for Ipv4Cidr {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>, {
struct Ipv4Visitor;
impl<'de> Visitor<'de> for Ipv4Visitor {
type Value = Ipv4Cidr;
#[inline]
fn expecting(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
f.write_str("an IPv4 CIDR string")
}
#[inline]
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: DeError, {
Ipv4Cidr::from_str(v).map_err(DeError::custom)
}
}
deserializer.deserialize_str(Ipv4Visitor)
}
}