| use super::*; |
| use crate::fmt; |
| use crate::io; |
| use crate::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr}; |
| use crate::os::xous::services; |
| use crate::sync::Arc; |
| use core::convert::TryInto; |
| use core::sync::atomic::{AtomicBool, AtomicU16, AtomicUsize, Ordering}; |
| |
| macro_rules! unimpl { |
| () => { |
| return Err(io::const_io_error!( |
| io::ErrorKind::Unsupported, |
| &"This function is not yet implemented", |
| )); |
| }; |
| } |
| |
| #[derive(Clone)] |
| pub struct TcpListener { |
| fd: Arc<AtomicU16>, |
| local: SocketAddr, |
| handle_count: Arc<AtomicUsize>, |
| nonblocking: Arc<AtomicBool>, |
| } |
| |
| impl TcpListener { |
| pub fn bind(socketaddr: io::Result<&SocketAddr>) -> io::Result<TcpListener> { |
| let mut addr = *socketaddr?; |
| |
| let fd = TcpListener::bind_inner(&mut addr)?; |
| return Ok(TcpListener { |
| fd: Arc::new(AtomicU16::new(fd)), |
| local: addr, |
| handle_count: Arc::new(AtomicUsize::new(1)), |
| nonblocking: Arc::new(AtomicBool::new(false)), |
| }); |
| } |
| |
| /// This returns the raw fd of a Listener, so that it can also be used by the |
| /// accept routine to replenish the Listener object after its handle has been converted into |
| /// a TcpStream object. |
| fn bind_inner(addr: &mut SocketAddr) -> io::Result<u16> { |
| // Construct the request |
| let mut connect_request = ConnectRequest { raw: [0u8; 4096] }; |
| |
| // Serialize the StdUdpBind structure. This is done "manually" because we don't want to |
| // make an auto-serdes (like bincode or rkyv) crate a dependency of Xous. |
| let port_bytes = addr.port().to_le_bytes(); |
| connect_request.raw[0] = port_bytes[0]; |
| connect_request.raw[1] = port_bytes[1]; |
| match addr.ip() { |
| IpAddr::V4(addr) => { |
| connect_request.raw[2] = 4; |
| for (dest, src) in connect_request.raw[3..].iter_mut().zip(addr.octets()) { |
| *dest = src; |
| } |
| } |
| IpAddr::V6(addr) => { |
| connect_request.raw[2] = 6; |
| for (dest, src) in connect_request.raw[3..].iter_mut().zip(addr.octets()) { |
| *dest = src; |
| } |
| } |
| } |
| |
| let Ok((_, valid)) = crate::os::xous::ffi::lend_mut( |
| services::net_server(), |
| services::NetLendMut::StdTcpListen.into(), |
| &mut connect_request.raw, |
| 0, |
| 4096, |
| ) else { |
| return Err(io::const_io_error!(io::ErrorKind::InvalidInput, &"Invalid response")); |
| }; |
| |
| // The first four bytes should be zero upon success, and will be nonzero |
| // for an error. |
| let response = connect_request.raw; |
| if response[0] != 0 || valid == 0 { |
| let errcode = response[1]; |
| if errcode == NetError::SocketInUse as u8 { |
| return Err(io::const_io_error!(io::ErrorKind::ResourceBusy, &"Socket in use")); |
| } else if errcode == NetError::Invalid as u8 { |
| return Err(io::const_io_error!( |
| io::ErrorKind::AddrNotAvailable, |
| &"Invalid address" |
| )); |
| } else if errcode == NetError::LibraryError as u8 { |
| return Err(io::const_io_error!(io::ErrorKind::Other, &"Library error")); |
| } else { |
| return Err(io::const_io_error!( |
| io::ErrorKind::Other, |
| &"Unable to connect or internal error" |
| )); |
| } |
| } |
| let fd = response[1] as usize; |
| if addr.port() == 0 { |
| // oddly enough, this is a valid port and it means "give me something valid, up to you what that is" |
| let assigned_port = u16::from_le_bytes(response[2..4].try_into().unwrap()); |
| addr.set_port(assigned_port); |
| } |
| // println!("TcpListening with file handle of {}\r\n", fd); |
| Ok(fd.try_into().unwrap()) |
| } |
| |
| pub fn socket_addr(&self) -> io::Result<SocketAddr> { |
| Ok(self.local) |
| } |
| |
| pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> { |
| let mut receive_request = ReceiveData { raw: [0u8; 4096] }; |
| |
| if self.nonblocking.load(Ordering::Relaxed) { |
| // nonblocking |
| receive_request.raw[0] = 0; |
| } else { |
| // blocking |
| receive_request.raw[0] = 1; |
| } |
| |
| if let Ok((_offset, _valid)) = crate::os::xous::ffi::lend_mut( |
| services::net_server(), |
| services::NetLendMut::StdTcpAccept(self.fd.load(Ordering::Relaxed)).into(), |
| &mut receive_request.raw, |
| 0, |
| 0, |
| ) { |
| if receive_request.raw[0] != 0 { |
| // error case |
| if receive_request.raw[1] == NetError::TimedOut as u8 { |
| return Err(io::const_io_error!(io::ErrorKind::TimedOut, &"accept timed out",)); |
| } else if receive_request.raw[1] == NetError::WouldBlock as u8 { |
| return Err(io::const_io_error!( |
| io::ErrorKind::WouldBlock, |
| &"accept would block", |
| )); |
| } else if receive_request.raw[1] == NetError::LibraryError as u8 { |
| return Err(io::const_io_error!(io::ErrorKind::Other, &"Library error")); |
| } else { |
| return Err(io::const_io_error!(io::ErrorKind::Other, &"library error",)); |
| } |
| } else { |
| // accept successful |
| let rr = &receive_request.raw; |
| let stream_fd = u16::from_le_bytes(rr[1..3].try_into().unwrap()); |
| let port = u16::from_le_bytes(rr[20..22].try_into().unwrap()); |
| let addr = if rr[3] == 4 { |
| SocketAddr::new(IpAddr::V4(Ipv4Addr::new(rr[4], rr[5], rr[6], rr[7])), port) |
| } else if rr[3] == 6 { |
| SocketAddr::new( |
| IpAddr::V6(Ipv6Addr::new( |
| u16::from_be_bytes(rr[4..6].try_into().unwrap()), |
| u16::from_be_bytes(rr[6..8].try_into().unwrap()), |
| u16::from_be_bytes(rr[8..10].try_into().unwrap()), |
| u16::from_be_bytes(rr[10..12].try_into().unwrap()), |
| u16::from_be_bytes(rr[12..14].try_into().unwrap()), |
| u16::from_be_bytes(rr[14..16].try_into().unwrap()), |
| u16::from_be_bytes(rr[16..18].try_into().unwrap()), |
| u16::from_be_bytes(rr[18..20].try_into().unwrap()), |
| )), |
| port, |
| ) |
| } else { |
| return Err(io::const_io_error!(io::ErrorKind::Other, &"library error",)); |
| }; |
| |
| // replenish the listener |
| let mut local_copy = self.local.clone(); // port is non-0 by this time, but the method signature needs a mut |
| let new_fd = TcpListener::bind_inner(&mut local_copy)?; |
| self.fd.store(new_fd, Ordering::Relaxed); |
| |
| // now return a stream converted from the old stream's fd |
| Ok((TcpStream::from_listener(stream_fd, self.local.port(), port, addr), addr)) |
| } |
| } else { |
| Err(io::const_io_error!(io::ErrorKind::InvalidInput, &"Unable to accept")) |
| } |
| } |
| |
| pub fn duplicate(&self) -> io::Result<TcpListener> { |
| self.handle_count.fetch_add(1, Ordering::Relaxed); |
| Ok(self.clone()) |
| } |
| |
| pub fn set_ttl(&self, ttl: u32) -> io::Result<()> { |
| if ttl > 255 { |
| return Err(io::Error::new(io::ErrorKind::InvalidInput, "TTL must be less than 256")); |
| } |
| crate::os::xous::ffi::blocking_scalar( |
| services::net_server(), |
| services::NetBlockingScalar::StdSetTtlTcp(self.fd.load(Ordering::Relaxed), ttl).into(), |
| ) |
| .or(Err(io::const_io_error!(io::ErrorKind::InvalidInput, &"Unexpected return value"))) |
| .map(|_| ()) |
| } |
| |
| pub fn ttl(&self) -> io::Result<u32> { |
| Ok(crate::os::xous::ffi::blocking_scalar( |
| services::net_server(), |
| services::NetBlockingScalar::StdGetTtlTcp(self.fd.load(Ordering::Relaxed)).into(), |
| ) |
| .or(Err(io::const_io_error!(io::ErrorKind::InvalidInput, &"Unexpected return value"))) |
| .map(|res| res[0] as _)?) |
| } |
| |
| pub fn set_only_v6(&self, _: bool) -> io::Result<()> { |
| unimpl!(); |
| } |
| |
| pub fn only_v6(&self) -> io::Result<bool> { |
| unimpl!(); |
| } |
| |
| pub fn take_error(&self) -> io::Result<Option<io::Error>> { |
| // this call doesn't have a meaning on our platform, but we can at least not panic if it's used. |
| Ok(None) |
| } |
| |
| pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> { |
| self.nonblocking.store(nonblocking, Ordering::Relaxed); |
| Ok(()) |
| } |
| } |
| |
| impl fmt::Debug for TcpListener { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "TCP listening on {:?}", self.local) |
| } |
| } |
| |
| impl Drop for TcpListener { |
| fn drop(&mut self) { |
| if self.handle_count.fetch_sub(1, Ordering::Relaxed) == 1 { |
| // only drop if we're the last clone |
| crate::os::xous::ffi::blocking_scalar( |
| services::net_server(), |
| crate::os::xous::services::NetBlockingScalar::StdTcpClose( |
| self.fd.load(Ordering::Relaxed), |
| ) |
| .into(), |
| ) |
| .unwrap(); |
| } |
| } |
| } |