luke-else/subnet_calculator
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First draft of subnet generation function. Still not complete, does overflow but I believe it is only small logic changes

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This commit is contained in:
Luke Else 2023-04-27 23:28:34 +01:00
parent cf35765cb4
commit 2dcbd405e4
2 changed files with 30 additions and 5 deletions
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2
src/main.rs
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@ -8,7 +8,7 @@ mod networking;
#[allow(unused_variables, unused_mut, unused_assignments)]
fn main() {
let networks = Network::create_subnet(&networking::ip::IpAddr::V4(127, 0, 0, 1), 23);
let networks = Network::create_subnet(&networking::ip::IpAddr::V4(192, 222, 222, 222), 25);
if networks.is_err() {
println!("Hello!");
}

33
src/networking/mod.rs
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@ -1,4 +1,4 @@
use std::str::FromStr;
use std::{str::FromStr, vec};
use ip::IpAddr;
pub mod ip;
@ -51,7 +51,7 @@ impl Network {
/// ```
/// let networks = Network::create_subnet(&IpAddr::V4(127, 0, 0, 1), 32);
/// ```
pub fn create_subnet(network_address: &IpAddr, cidr: u8) -> Result<Vec<Network>, NetworkingErr> {
pub fn create_subnet(network_address: &IpAddr, cidr: u8) -> Result<Vec<IpAddr>, NetworkingErr> {
//Get number of host and network bits.
let network_class = Network::get_network_class(network_address)?;
let network_address = network_address.to_arr()?;
@ -64,11 +64,36 @@ impl Network {
let num_borrowed_bits = cidr - network_class as u8;
//If no subnetting is required, just return the base address
if num_borrowed_bits == 0 {
unimplemented!();
}
// Determine the starting network
// Determine the networking gaps
let mut base_network = network_address.clone();
let most_sig_octet: u8 = match network_class {
NetworkClass::A => 1,
NetworkClass::B => 2,
NetworkClass::C => 3
};
for i in most_sig_octet..4 {
base_network[i as usize] = 0;
}
// Determine how many networks available
// We know that this value is >0 at this point
let num_networks = u8::pow(2, num_borrowed_bits as u32);
// Determine the networking gaps
let network_spacing: u8 = u8::pow(2, 8 - num_borrowed_bits as u32);
let networks = vec![];
//Create the subnets
let mut networks = vec![];
for i in 0..num_networks {
networks.push(IpAddr::from_arr(&base_network.clone())?);
base_network[most_sig_octet as usize] += network_spacing;
}
Ok(networks)
}