+use std::io;
+use std::io::{ MemWriter, Acceptor, Listener, TcpStream, IoResult, IoError, EndOfFile };
+use std::io::net::tcp::{ TcpAcceptor, TcpListener };
+use packet;
+use packet::{ Packet, Command, Answer, Error, ReadingResult, PacketType };
+
+// Default timeout when waiting data on a stream (for instance: 'TcpStream::read').
+static DEFAULT_TIMEOUT: Option<u64> = Some(500); // [ms].
+
+pub struct Server {
+ acceptor: TcpAcceptor
+}
+
+pub struct Client {
+ end_point: EndPoint,
+}
+
+pub struct EndPoint {
+ socket: TcpStream,
+ current_timestamp: u64
+}
+
+impl Server {
+ pub fn new(interface: &str, port: u16) -> IoResult<Server> {
+ let mut acceptor = try!(TcpListener::bind(interface, port).listen());
+
+ let server = Server {
+ acceptor: acceptor.clone()
+ };
+
+ spawn(proc() {
+ loop {
+ for stream in acceptor.incoming() {
+ match stream {
+ Ok(stream) => spawn(proc() {
+ Server::handle_client(EndPoint::new(stream));
+ }),
+ _ => return
+ }
+ }
+ }
+ });
+
+ Ok(server)
+ }
+
+ pub fn close(&mut self) -> IoResult<()> {
+ self.acceptor.close_accept()
+ }
+
+ fn handle_client(mut end_point: EndPoint) {
+ loop {
+ match end_point.read() {
+ Ok(packet@Packet { t: Command(..), .. }) => {
+ println!("[Server] Valid command received: {}", packet);
+ let answer = Answer(Packet::random_packet_data([]));
+ match end_point.send(answer.clone()) {
+ Ok(_) =>
+ println!("[Server] Answer sent: {}", answer),
+ Err(e) =>
+ println!("[Server] Can't send the answer. Error: {}", e)
+ }
+ },
+ // Socket has been closed.
+ Err(packet::IOReadError(IoError { kind: EndOfFile, .. })) => {
+ println!("[Server] Connection closed: EOF");
+ return
+ },
+ other =>
+ println!("[Server] Error or invalid packet: {}", other)
+ }
+ }
+ }
+}
+
+impl Client {
+ pub fn new(address: &str, port: u16) -> IoResult<Client> {
+ Ok(Client { end_point: EndPoint {
+ socket: try!(TcpStream::connect(address, port)),
+ current_timestamp: 0
+ }})
+ }
+
+ pub fn close(&mut self) -> IoResult<()> {
+ self.end_point.close()
+ }
+
+ pub fn send(&mut self, packet: PacketType) {
+ match packet {
+ Command(_) => {
+ println!("[Client] Sending: {}", packet);
+ match self.end_point.send_with_result(packet) {
+ Ok(Ok(packet@Packet { t: Answer(..), .. })) =>
+ println!("[Client] Command transmitted correctly, answer: {}", packet),
+ Ok(Ok(packet)) =>
+ println!("[Client] Command transmitted correctly, wrong answer: {}", packet),
+ Ok(Err(e)) =>
+ println!("[Client] Answer error: {}", e),
+ Err(e) =>
+ println!("[Client] Can't send the packet. Error: {}", e)
+ }
+ },
+ other =>
+ println!("[Client] Cannot send this type of packet: {}", other)
+ }
+ }
+
+ /// Send some valid and not-valid packets to the server and check the result.
+ /// For each test a new client is created.
+ pub fn start_tests(address: &str, port: u16) {
+ let execute = |f: &mut |&mut Client| -> bool| -> bool {
+ match Client::new(address, port) {
+ Ok(ref mut client) => (*f)(client),
+ Err(e) => {
+ println!("Unable to create a client. Error: {}", e);
+ false
+ }
+ }
+ };
+
+ fn raw_packet(timestamp: u64) -> Vec<u8> {
+ let mut m = MemWriter::new();
+ match (Packet { t: Command(Packet::random_packet_data([42])), timestamp: timestamp }).write(&mut m) {
+ Err(_) => vec!(),
+ _ => m.unwrap()
+ }
+ }
+
+ let mut tests = vec!(
+ // 1)
+ |client: &mut Client| -> bool {
+ println!("Sending a valid packet...");
+ match client.end_point.send_with_result(Command(Packet::random_packet_data([42]))) {
+ Ok(Ok(Packet { t: Answer(..), .. })) => true,
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 2)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with an unknown type...");
+ client.end_point.current_timestamp += 1;
+ let mut raw_packet = raw_packet(client.end_point.current_timestamp);
+ raw_packet[2] = 0xEE; // Alter the type.
+ match client.end_point.send_raw_with_result(raw_packet.as_slice()) {
+ Ok(Err(packet::IOReadError( IoError { kind: io::TimedOut, .. }))) => true, // OK: the server should not send any packet.
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 3)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with an old timestamp...");
+ client.end_point.current_timestamp += 1;
+ let raw_packet = raw_packet(0);
+ match client.end_point.send_raw_with_result(raw_packet.as_slice()) {
+ Ok(Err(packet::IOReadError( IoError { kind: io::TimedOut, .. }))) => true, // OK: the server should not send any packet.
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 4)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with altered crypted data (do not alter the padding)...");
+ client.end_point.current_timestamp += 1;
+ let mut raw_packet = raw_packet(client.end_point.current_timestamp);
+ raw_packet[11] = 0xDE;
+ raw_packet[12] = 0xAD;
+ raw_packet[13] = 0xBE;
+ raw_packet[14] = 0xEF;
+ match client.end_point.send_raw_with_result(raw_packet.as_slice()) {
+ Ok(Ok(Packet { t: Error(packet::AuthError), .. })) => true,
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 5)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with too small data...");
+ let command = Command(Packet::new_packet_data(0, Vec::from_elem(6, 0x00)));
+ match client.end_point.send_with_result(command) {
+ Ok(Err(packet::IOReadError( IoError { kind: io::TimedOut, .. }))) => true, // OK: the server should not send any packet.
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 6)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with too large data...");
+ let command = Command(Packet::new_packet_data(0, Vec::from_elem(40, 0x00)));
+ match client.end_point.send_with_result(command) {
+ Ok(Err(packet::IOReadError( IoError { kind: io::TimedOut, .. }))) => true, // OK: the server should not send any packet.
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ // 7)
+ |client: &mut Client| -> bool {
+ println!("Sending a packet with wrong padding (all 0)...");
+ client.end_point.current_timestamp += 1;
+ let mut m = MemWriter::new();
+ let raw_packet = match (Packet { t: Command(Packet::random_packet_data([42])), timestamp: client.end_point.current_timestamp }).write_with_padding_fun(&mut m, |_, _| -> u8 { 0 }) {
+ Err(_) => vec!(),
+ _ => m.unwrap()
+ };
+
+ match client.end_point.send_raw_with_result(raw_packet.as_slice()) {
+ Ok(Ok(Packet { t: Error(packet::CryptError), .. })) => true,
+ other => {
+ println!("Error: {}", other);
+ false
+ }
+ }
+ },
+ );
+
+ let mut nb_test_passed = 0;
+ for (i, test) in range(1, tests.len()+1).zip(tests.iter_mut()) {
+ println!("===== Test case #{}:", i)
+ if execute(test) {
+ nb_test_passed += 1;
+ println!("===== Test passed");
+ } else {
+ println!("===== Test failed");
+ }
+ }
+
+ if nb_test_passed == tests.len() {
+ println!("All tests passed");
+ } else {
+ println!("#{} test(s) failed", tests.len() - nb_test_passed);
+ }
+ }
+}
+
+impl EndPoint {
+ pub fn new(socket: TcpStream) -> EndPoint {
+ EndPoint { socket: socket, current_timestamp: 0 }
+ }
+
+ fn close(&mut self) -> IoResult<()> {
+ try!(self.socket.close_read());
+ try!(self.socket.close_write());
+ Ok(())
+ }
+
+ /// Send a packet and wait for an answer synchronously.
+ fn send_with_result(&mut self, p: PacketType) -> IoResult<ReadingResult> {
+ match self.send(p) {
+ Err(e) => Err(e),
+ _ => Ok(self.read())
+ }
+ }
+
+ /// Send arbitrary data and wait for an answer synchronously.
+ /// Do not increment the current timestamp.
+ fn send_raw_with_result(&mut self, p: &[u8]) -> IoResult<ReadingResult> {
+ self.socket.set_timeout(DEFAULT_TIMEOUT);
+ match self.socket.write(p) {
+ Err(e) => Err(e),
+ _ => Ok(self.read())
+ }
+ }
+
+ fn send(&mut self, p: PacketType) -> IoResult<()> {
+ self.socket.set_timeout(DEFAULT_TIMEOUT);
+ self.current_timestamp += 1;
+ match (Packet { t: p, timestamp: self.current_timestamp }).write(&mut self.socket) {
+ Err(packet::WriteIOError(e)) => Err(e),
+ _ => Ok(())
+ }
+ }
+
+ fn read(&mut self) -> ReadingResult {
+ fn send_error(ep: &mut EndPoint, error_type: packet::ErrorType) {
+ match ep.send(Error(error_type)) {
+ Err(e) => println!("Unable to send error packet: {}", e),
+ Ok(_) => ()
+ };
+ };
+
+ self.socket.set_timeout(DEFAULT_TIMEOUT);
+ match Packet::read(&mut self.socket) {
+ Ok(packet) => {
+ if packet.timestamp <= self.current_timestamp {
+ println!("Error, timestamp mismatch, current timestamp: {}, packet received: {}", self.current_timestamp, packet);
+ Err(packet::InvalidTimestampError)
+ } else {
+ self.current_timestamp = packet.timestamp + 1;
+ Ok(packet)
+ }
+ },
+ e @ Err(packet::PaddingError) => {
+ self.current_timestamp += 1;
+ send_error(self, packet::CryptError);
+ e
+ },
+ e @ Err(packet::MACMismatchError) => {
+ self.current_timestamp += 1;
+ send_error(self, packet::AuthError);
+ e
+ },
+ other =>
+ other
+ }
+ }
+}
projects / crypto_lab1.git / commitdiff