mirror of https://github.com/dswd/vpncloud.git
101 lines
3.1 KiB
Rust
101 lines
3.1 KiB
Rust
use std::net::SocketAddr;
|
|
use std::collections::{hash_map, HashMap};
|
|
use std::io::Read;
|
|
|
|
use super::types::{Protocol, Error, Table, Address};
|
|
use super::util::to_vec;
|
|
|
|
#[allow(dead_code)]
|
|
pub struct Packet;
|
|
|
|
impl Protocol for Packet {
|
|
fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
|
|
if data.len() < 1 {
|
|
return Err(Error::ParseError("Empty header"));
|
|
}
|
|
let version = data[0] >> 4;
|
|
match version {
|
|
4 => {
|
|
if data.len() < 20 {
|
|
return Err(Error::ParseError("Truncated header"));
|
|
}
|
|
Ok((Address(to_vec(&data[12..16])), Address(to_vec(&data[16..20]))))
|
|
},
|
|
6 => {
|
|
if data.len() < 40 {
|
|
return Err(Error::ParseError("Truncated header"));
|
|
}
|
|
Ok((Address(to_vec(&data[8..24])), Address(to_vec(&data[24..40]))))
|
|
},
|
|
_ => Err(Error::ParseError("Invalid version"))
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
struct RoutingEntry {
|
|
address: SocketAddr,
|
|
bytes: Vec<u8>,
|
|
prefix_len: u8
|
|
}
|
|
|
|
pub struct RoutingTable(HashMap<Vec<u8>, Vec<RoutingEntry>>);
|
|
|
|
impl RoutingTable {
|
|
pub fn new() -> Self {
|
|
RoutingTable(HashMap::new())
|
|
}
|
|
}
|
|
|
|
impl Table for RoutingTable {
|
|
fn learn(&mut self, addr: Address, prefix_len: Option<u8>, address: SocketAddr) {
|
|
let prefix_len = match prefix_len {
|
|
Some(val) => val,
|
|
None => addr.0.len() as u8 * 8
|
|
};
|
|
info!("New routing entry: {:?}/{} => {}", addr, prefix_len, address);
|
|
let group_len = (prefix_len as usize / 16) * 2;
|
|
let group_bytes: Vec<u8> = addr.0[..group_len].iter().map(|b| *b).collect();
|
|
let routing_entry = RoutingEntry{address: address, bytes: addr.0, prefix_len: prefix_len};
|
|
match self.0.entry(group_bytes) {
|
|
hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(routing_entry),
|
|
hash_map::Entry::Vacant(entry) => { entry.insert(vec![routing_entry]); () }
|
|
}
|
|
}
|
|
|
|
fn lookup(&self, addr: &Address) -> Option<SocketAddr> {
|
|
let len = addr.0.len()/2 * 2;
|
|
for i in 0..(len/2)+1 {
|
|
if let Some(group) = self.0.get(&addr.0[0..len-2*i]) {
|
|
for entry in group {
|
|
if entry.bytes.len() != addr.0.len() {
|
|
continue;
|
|
}
|
|
let mut match_len = 0;
|
|
for i in 0..addr.0.len() {
|
|
let b = addr.0[i] ^ entry.bytes[i];
|
|
if b == 0 {
|
|
match_len += 8;
|
|
} else {
|
|
match_len += b.leading_zeros();
|
|
break;
|
|
}
|
|
}
|
|
if match_len as u8 >= entry.prefix_len {
|
|
return Some(entry.address);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
fn housekeep(&mut self) {
|
|
//nothin to do
|
|
}
|
|
|
|
fn remove_all(&mut self, _addr: SocketAddr) {
|
|
unimplemented!()
|
|
}
|
|
}
|