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// Copyright (C) 2015 Sebastian Dröge <sebastian@centricular.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301, USA.
//
extern crate mio;
use mio::*;
use mio::udp::*;
use std::net::SocketAddr;
use std::ops::Range;
const SOCKET_EVENT: Token = Token(0);
const SOCKET_GENERAL: Token = Token(1);
struct PtpReflector {
poll: Poll,
event_socket: UdpSocket,
event_addr: SocketAddr,
general_socket: UdpSocket,
general_addr: SocketAddr,
}
fn slice_map_range_in_place<T, F>(s: &mut [T], range: Range<usize>, mut f: F)
where F: FnMut(&T) -> T
{
let n = s.len();
if range.end > n {
panic!("Invalid range {} > {}", range.end, n);
}
for i in range {
s[i] = f(&s[i]);
}
}
impl PtpReflector {
fn new() -> Result<PtpReflector, String> {
let poll = try!(Poll::new().map_err(|e| e.to_string()));
let multicast_group = "224.0.1.129".parse().unwrap();
let any_addr = "0.0.0.0".parse().unwrap();
let event_bind_addr = "0.0.0.0:319".parse().unwrap();
let event_socket = try!(UdpSocket::bind(&event_bind_addr).map_err(|e| e.to_string()));
try!(event_socket.join_multicast_v4(&multicast_group, &any_addr)
.map_err(|e| e.to_string()));
try!(poll.register(&event_socket,
SOCKET_EVENT,
Ready::readable(),
PollOpt::level())
.map_err(|e| e.to_string()));
// FIXME: How can we create this from the multicast group?
// let event_addr = SocketAddr::new(multicast_group, 319);
let event_addr = "224.0.1.129:319".parse().unwrap();
let general_bind_addr = "0.0.0.0:320".parse().unwrap();
let general_socket = try!(UdpSocket::bind(&general_bind_addr).map_err(|e| e.to_string()));
try!(general_socket.join_multicast_v4(&multicast_group, &any_addr)
.map_err(|e| e.to_string()));
try!(poll.register(&general_socket,
SOCKET_GENERAL,
Ready::readable(),
PollOpt::level())
.map_err(|e| e.to_string()));
// FIXME: How can we create this from the multicast group?
// let general_addr = SocketAddr::new(multicast_group, 320);
let general_addr = "224.0.1.129:320".parse().unwrap();
Ok(PtpReflector {
poll: poll,
event_socket: event_socket,
event_addr: event_addr,
general_socket: general_socket,
general_addr: general_addr,
})
}
fn ready(&self, event: &Event) {
if !event.kind().is_readable() {
return;
}
let (socket, addr) = match event.token() {
SOCKET_EVENT => (&self.event_socket, &self.event_addr),
SOCKET_GENERAL => (&self.general_socket, &self.general_addr),
_ => unreachable!(),
};
let msg = &mut [0; 1024];
let length = match socket.recv_from(msg) {
Err(e) => {
println!("Error while receiving message: {}", e.to_string());
return;
}
Ok(Some((l, _))) => l,
Ok(None) => {
println!("Error while receiving message");
return;
}
};
println!("Got message of size {}", length);
if length < 44 {
return;
}
let domain = msg[4];
let msg_type = msg[0] & 0x0f;
let forward = match domain {
0 => {
msg[4] = 1;
slice_map_range_in_place(msg, 20..28, |&x| x ^ 0xff);
match msg_type {
0x0 | 0x08 | 0xb => true,
0x9 if msg.len() >= 54 => {
slice_map_range_in_place(msg, 44..52, |&x| x ^ 0xff);
true
}
_ => false,
}
}
1 => {
msg[4] = 0;
slice_map_range_in_place(msg, 20..28, |&x| x ^ 0xff);
match msg_type {
0x1 => true,
_ => false,
}
}
_ => false,
};
if forward {
if let Err(e) = socket.send_to(&msg[..length], addr) {
println!("Error while sending message: {}", e.to_string());
return;
};
println!("Sent message of size {}", length);
}
}
fn run(&self) -> Result<(), String> {
let mut events = Events::with_capacity(1024);
loop {
try!(self.poll.poll(&mut events, None).or_else(|err| Err(err.to_string())));
for event in events.iter() {
self.ready(&event);
}
}
}
}
fn main() {
let res = PtpReflector::new().and_then(|handler| handler.run());
match res {
Ok(()) => (),
Err(s) => panic!(s),
};
}
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