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use blake2::digest::{Update, VariableOutput};
use blake2::VarBlake2b;
use ipnetwork::{Ipv4Network, Ipv6Network};
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use std::str::FromStr;
pub fn ip(name: &str, cidr: &str) -> Result<IpAddr, String> {
let ip_addr = match IpAddr::from_str(cidr.split("/").collect::<Vec<&str>>()[0])
.map_err(|err| err.to_string())
{
Ok(ip_addr) => ip_addr,
Err(msg) => return Err(msg),
};
match ip_addr {
IpAddr::V6(_) => {
match Ipv6Network::from_str(cidr).map_err(|err| format!("{:?}", err)) {
Ok(net) => {
if net.prefix() == 128 {
return Err(format!(
"{}/{} is already a full IPv6 address",
net.ip(),
net.prefix()
));
};
return ip6(name, net).map(|ip| IpAddr::V6(ip));
}
Err(msg) => return Err(msg),
};
}
IpAddr::V4(_) => {
match Ipv4Network::from_str(cidr).map_err(|err| format!("{:?}", err)) {
Ok(net) => {
if net.prefix() == 32 {
return Err(format!(
"{}/{} is already a full IPv4 address",
net.ip(),
net.prefix()
));
};
let ip6prefix = 128 - 32 + net.prefix();
let ip6net = format!("::{}/{}", net.ip(), ip6prefix);
match Ipv6Network::from_str(ip6net.as_str()).map_err(|err| format!("{:?}", err))
{
Ok(net) => match ip6(name, net) {
Ok(a) => {
let a = a.to_string();
let addr = a.split("::").collect::<Vec<&str>>()[1];
match Ipv4Addr::from_str(addr) {
Ok(ip) => return Ok(IpAddr::V4(ip)),
Err(msg) => {
return Err(format!(
"generated IPv4 address ({}) has \
{}",
addr, msg
))
}
};
}
Err(msg) => return Err(msg),
},
Err(msg) => return Err(msg),
};
}
Err(msg) => return Err(msg),
};
}
};
}
fn ip6(name: &str, net: Ipv6Network) -> Result<Ipv6Addr, String> {
let network_len = net.prefix() as usize / 4;
let ip = net.ip().segments();
let ip_parts: Vec<String> = ip.iter().map(|b| format!("{:04x}", b)).collect();
let ip_hash = ip_parts.join("");
let ip_hash = ip_hash.as_str();
let network_hash = &ip_hash[0..network_len];
let address_len = 32 - network_len;
let blake_len = (address_len / 2) + (address_len % 2);
let address_hash = hash(name.as_bytes(), blake_len);
let ip_hash = format!("{}{}", network_hash, address_hash);
let ip = format!(
"{}:{}:{}:{}:{}:{}:{}:{}",
&ip_hash[0..4],
&ip_hash[4..8],
&ip_hash[8..12],
&ip_hash[12..16],
&ip_hash[16..20],
&ip_hash[20..24],
&ip_hash[24..28],
&ip_hash[28..32]
);
Ipv6Addr::from_str(ip.as_str())
.map_err(|err| format!("generated IPv6 address ({}) has {}", ip, err))
}
pub fn subnet(name: &str) -> String {
hash(name.as_bytes(), 2)
}
fn hash(name: &[u8], len: usize) -> String {
let mut hasher = VarBlake2b::new(len).unwrap();
hasher.update(name);
let mut hash = String::with_capacity(len);
hasher.finalize_variable(|res| {
hash = res.iter().map(|v| format!("{:02x}", v)).collect();
});
hash
}