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use std::net::Ipv4Addr;
use std::fmt;
use std::error::Error;
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum IpNetworkError {
InvalidAddr(String),
InvalidPrefix,
InvalidCidrFormat(String),
}
impl fmt::Display for IpNetworkError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use IpNetworkError::*;
match *self {
InvalidAddr(ref s) => write!(f, "invalid address: {}", s),
InvalidPrefix => write!(f, "invalid prefix"),
InvalidCidrFormat(ref s) => write!(f, "invalid cidr format: {}", s),
}
}
}
impl Error for IpNetworkError {
fn description(&self) -> &str {
use IpNetworkError::*;
match *self {
InvalidAddr(_) => "address is invalid",
InvalidPrefix => "prefix is invalid",
InvalidCidrFormat(_) => "cidr is invalid",
}
}
}
pub fn cidr_parts(cidr: &str) -> Result<(&str, &str), IpNetworkError> {
let parts = cidr.split('/').collect::<Vec<&str>>();
if parts.len() == 1 {
Err(IpNetworkError::InvalidCidrFormat(format!(
"CIDR must contain '/': {}",
cidr
)))
} else if parts.len() == 2 {
Ok((parts[0], parts[1]))
} else {
Err(IpNetworkError::InvalidCidrFormat(format!(
"CIDR must contain a single '/': {}",
cidr
)))
}
}
pub fn parse_prefix(prefix: &str, max: u8) -> Result<u8, IpNetworkError> {
let mask = prefix
.parse::<u8>()
.map_err(|_| IpNetworkError::InvalidPrefix)?;
if mask > max {
Err(IpNetworkError::InvalidPrefix)
} else {
Ok(mask)
}
}
pub fn parse_addr(addr: &str) -> Result<Ipv4Addr, IpNetworkError> {
let addr_parts = addr.split('.').map(|b| b.parse::<u8>());
let mut bytes = [0; 4];
for (i, byte) in addr_parts.enumerate() {
if i >= 4 {
return Err(IpNetworkError::InvalidAddr(format!(
"More than 4 bytes: {}",
addr
)));
}
bytes[i] = byte.map_err(|_| {
IpNetworkError::InvalidAddr(format!("All bytes not 0-255: {}", addr))
})?;
}
Ok(Ipv4Addr::new(bytes[0], bytes[1], bytes[2], bytes[3]))
}