191 lines
5.4 KiB
Rust
191 lines
5.4 KiB
Rust
use hashbrown::HashSet;
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use integer_encoding::{FixedInt, VarInt};
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use secretbox::CipherType::Salsa20;
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use secretbox::SecretBox;
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use serde::Serialize;
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use std::io::{Error, Read, Write};
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use std::net::{Shutdown, TcpStream};
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/// Connections provides an interface for manage sets of connections on top of a particular
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/// ACN.
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pub mod service;
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#[derive(Debug)]
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pub enum ServiceError {
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ClosedNormally,
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ConnectionFailed(String),
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ListenFailed(String),
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}
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#[derive(Clone)]
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pub struct InboundConnection(());
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#[derive(Clone)]
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pub struct OutboundConnection(());
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#[derive(Clone, Eq, PartialEq, Hash)]
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pub struct Capability(pub &'static str);
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pub struct Connection<Direction> {
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conn: TcpStream,
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direction: Direction,
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key: Vec<u8>,
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hostname: String,
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capabilities: HashSet<Capability>,
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}
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pub trait ConnectionInterface {
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fn set_hostname(&mut self, hostname: &String);
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fn hostname(&self) -> String;
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fn enable_encryption(&mut self, key: Vec<u8>);
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fn send(&mut self, amsg: &String) -> Result<(), Error>;
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fn send_encrypted(&mut self, msg: Vec<u8>) -> Result<(), Error>;
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fn expect_encrypted(&mut self) -> Vec<u8>;
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fn expect(&mut self) -> Result<Vec<u8>, Error>;
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fn shutdown(&mut self);
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fn set_capability(&mut self, capability: &Capability);
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fn has_capability(&self, capability: &Capability) -> bool;
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}
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impl<Direction> ConnectionInterface for Connection<Direction> {
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fn set_hostname(&mut self, hostname: &String) {
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self.hostname = hostname.clone()
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}
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fn hostname(&self) -> String {
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self.hostname.clone()
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}
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fn enable_encryption(&mut self, key: Vec<u8>) {
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self.key = key
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}
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fn send(&mut self, amsg: &String) -> Result<(), Error> {
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let mut len = [0u8; 2];
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(amsg.len() as u16).encode_var(&mut len);
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let mut msg = vec![];
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msg.extend_from_slice(len.as_slice());
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msg.extend_from_slice(amsg.as_bytes());
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let mut msg = msg;
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while msg.len() < 8192 {
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msg.push(0);
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}
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self.conn.write_all(msg.as_slice())
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}
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fn send_encrypted(&mut self, msg: Vec<u8>) -> Result<(), Error> {
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let mut msg = msg;
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while msg.len() < 8192 - 40 {
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msg.push(0);
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}
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let secret_box = SecretBox::new(&self.key, Salsa20).unwrap();
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let msg = secret_box.easy_seal(msg.as_slice());
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self.conn.write_all(msg.as_slice())
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}
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fn expect_encrypted(&mut self) -> Vec<u8> {
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let secret_box = SecretBox::new(&self.key, Salsa20).unwrap();
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let mut result = [0u8; 8192];
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match self.conn.read_exact(&mut result) {
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Err(_e) => {
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return vec![];
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}
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_ => {}
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}
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let msg = match secret_box.easy_unseal(&result) {
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Some(msg) => msg,
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_ => {
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return vec![];
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}
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};
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let msg = msg.as_slice();
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let _len_bytes = [0u8; 2];
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let len = u16::decode_fixed(&msg[0..2]) as usize;
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if len > 8192 {
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return vec![]; // lol no.
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}
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msg[2..len + 2].to_vec()
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}
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fn expect(&mut self) -> Result<Vec<u8>, Error> {
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let mut msg = [0; 8192];
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let result = self.conn.read_exact(&mut msg);
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match result {
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Err(e) => Err(e),
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Ok(()) => {
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// TODO why did I decide to use varints here?!?!
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let len = u16::decode_var(&msg[0..2]).unwrap().0 as usize;
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// println!("{} [{}]", len, String::from_utf8(msg[2..len + 2].to_vec()).unwrap());
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return Ok(msg[2..len + 2].to_vec());
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}
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}
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}
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fn shutdown(&mut self) {
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match self.conn.shutdown(Shutdown::Both) {
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_ => {} // If anything bad happens we will know soon enough...
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}
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}
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fn set_capability(&mut self, capability: &Capability) {
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self.capabilities.insert(capability.clone());
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}
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fn has_capability(&self, capability: &Capability) -> bool {
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self.capabilities.contains(capability)
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}
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}
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impl<Direction> Connection<Direction>
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where
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Direction: Clone,
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{
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pub fn new_inbound(conn: TcpStream) -> Connection<InboundConnection> {
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Connection {
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conn,
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direction: InboundConnection(()),
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key: vec![],
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hostname: String::new(),
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capabilities: HashSet::new(),
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}
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}
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pub fn new_outbound(conn: TcpStream) -> Connection<OutboundConnection> {
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Connection {
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conn,
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direction: OutboundConnection(()),
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key: vec![],
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hostname: String::new(),
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capabilities: HashSet::new(),
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}
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}
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/// Send anything implemented Serialize as JSON
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pub fn send_json_encrypted<T>(&mut self, data: T) -> Result<(), Error>
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where
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T: Serialize,
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{
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let mut msg = vec![];
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let mut len = [0u8; 2];
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let json = serde_json::to_string(&data).unwrap();
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(json.len() as u16).encode_fixed(&mut len);
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msg.extend_from_slice(len.as_slice());
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msg.extend_from_slice(json.as_bytes());
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self.send_encrypted(msg)
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}
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pub fn try_clone(&self) -> Connection<Direction> {
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Connection {
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conn: self.conn.try_clone().unwrap(),
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direction: self.direction.clone(),
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key: self.key.clone(),
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hostname: self.hostname.clone(),
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capabilities: self.capabilities.clone(),
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}
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}
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}
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pub struct Hostname {}
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