mirror of https://github.com/dswd/vpncloud.git
100 lines
3.0 KiB
Rust
100 lines
3.0 KiB
Rust
use std::net::SocketAddr;
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use std::collections::{hash_map, HashMap};
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use std::io::Read;
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use super::types::{Protocol, Error, Table, Address};
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#[allow(dead_code)]
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pub struct Packet;
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impl Protocol for Packet {
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fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
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if data.len() < 1 {
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return Err(Error::ParseError("Empty header"));
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}
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let version = data[0] >> 4;
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match version {
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4 => {
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let src = try!(Address::read_from_fixed(&data[12..], 4));
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let dst = try!(Address::read_from_fixed(&data[16..], 4));
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Ok((src, dst))
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},
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6 => {
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let src = try!(Address::read_from_fixed(&data[8..], 16));
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let dst = try!(Address::read_from_fixed(&data[24..], 16));
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Ok((src, dst))
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},
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_ => Err(Error::ParseError("Invalid version"))
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}
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}
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}
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struct RoutingEntry {
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address: SocketAddr,
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bytes: [u8; 16],
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prefix_len: u8
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}
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pub struct RoutingTable(HashMap<[u8; 16], Vec<RoutingEntry>>);
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impl RoutingTable {
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pub fn new() -> Self {
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RoutingTable(HashMap::new())
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}
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}
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impl Table for RoutingTable {
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fn learn(&mut self, addr: Address, prefix_len: Option<u8>, address: SocketAddr) {
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let prefix_len = match prefix_len {
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Some(val) => val,
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None => addr.len * 8
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};
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info!("New routing entry: {:?}/{} => {}", addr, prefix_len, address);
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let group_len = (prefix_len as usize / 16) * 2;
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assert!(group_len <= 16);
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let mut group_bytes = [0; 16];
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for i in 0..group_len {
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group_bytes[i] = addr.data[i];
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}
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let routing_entry = RoutingEntry{address: address, bytes: addr.data, prefix_len: prefix_len};
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match self.0.entry(group_bytes) {
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hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(routing_entry),
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hash_map::Entry::Vacant(entry) => { entry.insert(vec![routing_entry]); () }
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}
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}
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fn lookup(&mut self, addr: &Address) -> Option<SocketAddr> {
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let len = addr.len as usize/2 * 2;
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for i in 0..(len/2)+1 {
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if let Some(group) = self.0.get(&addr.data[0..len-2*i]) {
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for entry in group {
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let mut match_len = 0;
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for j in 0..addr.len as usize {
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let b = addr.data[j] ^ entry.bytes[j];
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if b == 0 {
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match_len += 8;
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} else {
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match_len += b.leading_zeros();
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break;
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}
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}
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if match_len as u8 >= entry.prefix_len {
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return Some(entry.address);
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}
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}
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}
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}
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None
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}
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fn housekeep(&mut self) {
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//nothing to do
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}
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fn remove_all(&mut self, _addr: SocketAddr) {
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unimplemented!()
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}
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}
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