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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::buf::{ByteBuf};
use mio::udp::*;
use std::net::{SocketAddr};
use std::ops::{Range};
const SOCKET_EVENT : Token = Token(0);
const SOCKET_GENERAL: Token = Token(1);
struct PtpReflectorHandler {
event_socket : UdpSocket,
event_addr : SocketAddr,
general_socket : UdpSocket,
general_addr : SocketAddr,
}
fn vector_map_range_in_place<T,F>(v: &mut Vec<T>, range: Range<usize>, mut f: F)
where F: FnMut(&T) -> T {
let n = v.len();
if range.end > n {
panic!("Invalid range {} > {}", range.end, n);
}
for i in range {
v[i] = f(&v[i]);
}
}
impl PtpReflectorHandler {
fn new(event_loop: &mut EventLoop<PtpReflectorHandler>) -> Result<PtpReflectorHandler, String> {
let multicast_group = "224.0.1.129".parse().unwrap();
let event_bind_addr = "0.0.0.0:319".parse().unwrap();
let event_socket = try!(UdpSocket::bound(&event_bind_addr).map_err(|e| e.to_string()));
try!(event_socket.join_multicast(&multicast_group).map_err(|e|e.to_string()));
try!(event_loop.register_opt(&event_socket, SOCKET_EVENT, Interest::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::bound(&general_bind_addr).map_err(|e| e.to_string()));
try!(general_socket.join_multicast(&multicast_group).map_err(|e|e.to_string()));
try!(event_loop.register_opt(&general_socket, SOCKET_GENERAL, Interest::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 (PtpReflectorHandler {
event_socket: event_socket,
event_addr: event_addr,
general_socket: general_socket,
general_addr: general_addr,
})
}
}
impl Handler for PtpReflectorHandler {
type Timeout = usize;
type Message = ();
fn readable(&mut self, _: &mut EventLoop<PtpReflectorHandler>, token: Token, _: ReadHint) {
let (socket, addr) = match token {
SOCKET_EVENT => (&self.event_socket, &self.event_addr),
SOCKET_GENERAL => (&self.general_socket, &self.general_addr),
_ => panic!("unexpected token")
};
let mut recv_buf = ByteBuf::mut_with_capacity(1024);
match socket.recv_from(&mut recv_buf) {
Err(e) => {
print!("Error while receiving message: {}\n", e.to_string());
return;
},
_ => ()
};
let mut msg = recv_buf.flip().bytes().to_owned();
print!("Got message of size {}\n", msg.len());
if msg.len() < 44 {
return;
}
let domain = msg[4];
let msg_type = msg[0] & 0x0f;
let forward = match domain {
0 => {
msg[4] = 1;
vector_map_range_in_place(&mut msg, Range {start:20, end:28}, |&x| x ^ 0xff);
match msg_type {
0x0 | 0x08 | 0xb => true,
0x9 if msg.len() >= 54 => {
vector_map_range_in_place(&mut msg, Range {start:44, end:52}, |&x| x ^ 0xff);
true
},
_ => false
}
},
1 => {
msg[4] = 0;
vector_map_range_in_place(&mut msg, Range {start:20, end:28}, |&x| x ^ 0xff);
match msg_type {
0x1 => true,
_ => false
}
},
_ => false
};
if forward {
let mut send_buf = ByteBuf::from_slice(&msg);
match socket.send_to(&mut send_buf, addr) {
Err(e) => {
print!("Error while sending message: {}\n", e.to_string());
return;
},
_ => ()
};
print!("Sent message of size {}\n", msg.len());
}
}
}
fn main() {
let mut event_loop = EventLoop::new().unwrap();
let res =
PtpReflectorHandler::new(&mut event_loop)
.map_err(|e| e.to_string())
.and_then(|mut handler| {
event_loop.run(&mut handler)
.map_err(|e| e.to_string())
});
match res {
Ok(_) => (),
Err(s) => panic!(s)
};
}
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