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//! *Note about these docs* //! //! These docs are mostly copied verbatim from the UDT documentation. If you see references to the //! C++ function names instead of the rust function names, that's why. //! //! # UDT //! Bindings to the UDT4 high performance data data transfer library //! //! UDT follows closely the BSD socket API, but several of the functions have different semantics. //! //! UDT is a high performance data transfer protocol - UDP-based data transfer protocol. It was //! designed for data intensive applications over high speed wide area networks, to overcome the //! efficiency and fairness problems of TCP. As its name indicates, UDT is built on top of UDP and //! it provides both reliable data streaming and messaging services. //! //! //! # Examples //! //! To create a Datagram server, that can send and receive messages: //! //! ``` no_run //! use std::str::FromStr; //! use std::net::{SocketAddr, SocketAddrV4}; //! use udt::*; //! //! let localhost = std::net::Ipv4Addr::from_str("127.0.0.1").unwrap(); //! //! let sock = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); //! sock.bind(SocketAddr::V4(SocketAddrV4::new(localhost, 0))).unwrap(); //! let my_addr = sock.getsockname().unwrap(); //! println!("Server bound to {:?}", my_addr); //! sock.listen(5).unwrap(); //! let (mut new_socket, peer) = sock.accept().unwrap(); //! println!("Received new connection from peer {:?}", peer); //! //! //! ``` //! //! #[macro_use] extern crate log; #[macro_use] extern crate bitflags; extern crate libudt4_sys as raw; #[cfg(windows)] extern crate winapi; use std::sync::{Once, ONCE_INIT}; extern crate libc; use libc::{c_int}; use std::mem::size_of; use std::ffi::{CStr}; use std::net::SocketAddr; use std::net::SocketAddrV4; #[cfg(windows)] #[macro_use] mod _plat_specifics { pub use winapi::SOCKADDR as sockaddr; pub use winapi::SOCKADDR_IN as sockaddr_in; pub use winapi::IN_ADDR as in_addr; pub use winapi::{AF_INET, AF_INET6}; pub use winapi::{SOCK_STREAM, SOCK_DGRAM}; pub fn get_udpsock_fd(a: ::std::net::UdpSocket) -> ::std::os::windows::io::RawSocket { use ::std::os::windows::io::AsRawSocket; a.as_raw_socket() } macro_rules! s_addr { ($x:expr) => ($x.S_un) } } #[cfg(not(windows))] #[macro_use] mod _plat_specifics { pub use libc::{sockaddr, sockaddr_in, in_addr}; pub use libc::{AF_INET, AF_INET6}; pub use libc::{SOCK_STREAM, SOCK_DGRAM}; pub fn get_udpsock_fd(a: ::std::net::UdpSocket) -> ::std::os::unix::io::RawFd { use ::std::os::unix::io::AsRawFd; a.as_raw_fd() } macro_rules! s_addr { ($x:expr) => ($x.s_addr) } } use _plat_specifics::*; pub use raw::UdtStatus; bitflags! { /// This is a bitflag field that can be constructed with `UDT_EPOLL_IN`, `UDT_EPOLL_OUT`, or /// `UDT_EPOLL_ERR` /// /// Example: /// /// ``` /// # use udt::*; /// let mut events = EpollEvents::all(); /// events.remove(UDT_EPOLL_ERR); /// assert!(events.contains(UDT_EPOLL_OUT)); /// assert!(! events.contains(UDT_EPOLL_ERR)); /// ``` pub flags EpollEvents: c_int { /// An Epoll Event to watch for read events const UDT_EPOLL_IN = 0x1, /// An Epoll Event to watch for write events const UDT_EPOLL_OUT = 0x4, /// An Epoll Event to watch for exception events const UDT_EPOLL_ERR = 0x8 } } // makes defining the UdtOpts mod a little less messy macro_rules! impl_udt_opt { ($(#[$doc:meta])* impl $name:ident: $ty:ty) => { $(#[$doc])* pub struct $name; impl ::UdtOption<$ty> for $name { fn get_type(&self) -> ::raw::UDTOpt { ::raw::UDTOpt::$name } } }; } /// Initialize the UDT library. /// /// In particular, starts the background garbage collection thread. /// /// It is safe to call this function multiple times. A corresponding cleanup function will /// automatically be called when the program exists. pub fn init() { static INIT: Once = ONCE_INIT; INIT.call_once(|| unsafe { trace!("did INIT"); raw::udt_startup(); assert_eq!(libc::atexit(shutdown), 0); }); extern fn shutdown() { unsafe { raw::udt_cleanup(); } ; } } /// A UDT Socket /// /// Internally, a UDT socket is represented as a 32-bit int. As such, a `UdtSocket` can be copied /// and cloned #[derive(Debug, PartialEq, Eq, Copy, Clone, Hash)] pub struct UdtSocket { _sock: raw::UDTSOCKET, } /// A UDT Error #[derive(Debug)] pub struct UdtError { /// The numeric error code may be one of the constants in the [`libudt4-sys`][1] crate /// /// [1]: ../libudt4_sys/index.html pub err_code: i32, /// A textual description of the error pub err_msg: String } pub trait UdtOption<T> { fn get_type(&self) -> raw::UDTOpt; } #[repr(C)] /// Linger option pub struct Linger { /// Nonzero to linger on close pub onoff: i32, /// Time to longer pub linger: i32 } #[allow(non_camel_case_types)] #[allow(non_snake_case)] pub mod UdtOpts { //! Various options that can be passed to `getsockopt` or `setsockopt` //! //! These are typed in such a way so that when they are used with `getsockopt` or `setsockopt`, //! they will require the right data type. //! //! # Examples //! //! ``` //! use udt::*; //! //! let sock = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); //! let recv_buf: i32 = sock.getsockopt(UdtOpts::UDT_RCVBUF).unwrap(); //! let rendezvous: bool = sock.getsockopt(UdtOpts::UDT_RENDEZVOUS).unwrap(); //! //! ``` //! impl_udt_opt!{ /// Maximum Packet size (bytes) /// /// Including all UDT, UDP, and IP headers. Default 1500 bytes impl UDT_MSS: i32 } impl_udt_opt!{ /// Synchronization mode of data sending /// /// True for blocking sending; false for non-blocking sending. Default true impl UDT_SNDSYN: bool } impl_udt_opt! { /// Synchronization mode for receiving. /// /// true for blocking receiving; false for non-blocking /// receiving. Default true. impl UDT_RCVSYN: bool } // MISSING: UDT_CC for custom congestion control impl_udt_opt! { ///Maximum window size (packets) /// ///Default 25600. Do NOT change this unless you know what you are doing. Must change this ///before modifying the buffer sizes. impl UDT_FC: i32 } impl_udt_opt!( /// UDT sender buffer size limit (bytes) /// /// Default 10MB (10240000). impl UDT_SNDBUF: i32); impl_udt_opt!( /// UDT receiver buffer size limit (bytes) /// /// Default 10MB (10240000). impl UDT_RCVBUF: i32); impl_udt_opt!(///UDP socket sender buffer size (bytes) /// /// Default 1MB (1024000). impl UDP_SNDBUF: i32); impl_udt_opt!(/// UDP socket receiver buffer size (bytes) /// /// Default 1MB (1024000). impl UDP_RCVBUF: i32); impl_udt_opt!(/// Linger time on close(). /// /// Default 180 seconds. impl UDT_LINGER: ::Linger); impl_udt_opt!(/// Rendezvous connection setup. /// /// Default false (no rendezvous mode). impl UDT_RENDEZVOUS: bool); impl_udt_opt!(/// Sending call timeout (milliseconds). /// /// Default -1 (infinite). impl UDT_SNDTIMEO: i32); impl_udt_opt!(/// Receiving call timeout (milliseconds). /// /// Default -1 (infinite). impl UDT_RCVTIMEO: i32); impl_udt_opt!(/// Reuse an existing address or create a new one. /// /// Default true (reuse). impl UDT_REUSEADDR: bool); impl_udt_opt!(/// Maximum bandwidth that one single UDT connection can use (bytes per second). /// /// Default -1 (no upper limit). impl UDT_MAXBW: i64); impl_udt_opt!(/// Current status of the UDT socket. Read only. impl UDT_STATE: i32); impl_udt_opt!(/// The EPOLL events available to this socket. Read only. impl UDT_EVENT: i32); impl_udt_opt!(/// Size of pending data in the sending buffer. Read only. impl UDT_SNDDATA: i32); impl_udt_opt!(/// Size of data available to read, in the receiving buffer. Read only. impl UDT_RCVDATA: i32); } fn get_last_err() -> UdtError { let msg = unsafe{ CStr::from_ptr(raw::udt_getlasterror_desc()) }; UdtError{err_code: unsafe{ raw::udt_getlasterror_code() as i32}, err_msg: String::from_utf8_lossy(msg.to_bytes()).into_owned()} } #[repr(C)] pub enum SocketFamily { /// IPv4 AFInet, /// IPV6 AFInet6 } impl SocketFamily { fn get_val(&self) -> c_int { match *self { SocketFamily::AFInet => AF_INET, SocketFamily::AFInet6 => AF_INET6 }} } /// Socket type /// /// When a UDT socket is created as a Datagram type, UDT will send and receive data as messages. /// The boundary of the message is preserved and the message is delivered as a whole unit. Sending /// or receving messages do not need a loop; a message will be either completely delivered or not /// delivered at all. However, at the receiver side, if the user buffer is shorter than the message /// length, only part of the message will be copied into the user buffer while the message will /// still be discarded. /// /// #[repr(C)] pub enum SocketType { /// A socket type that supports data streaming Stream = SOCK_STREAM as isize, /// A socket type for messaging /// /// Note that UDT Datagram sockets are also connection oriented. A UDT connection can only be /// set up between the same socket types Datagram = SOCK_DGRAM as isize } impl SocketType { fn get_val(&self) -> c_int { match *self { SocketType::Stream => SOCK_STREAM, SocketType::Datagram => SOCK_DGRAM }} } // SocketAddr to sockaddr_in #[cfg(target_os="linux")] fn get_sockaddr(name: SocketAddr) -> sockaddr_in { if let SocketAddr::V4(v4) = name { trace!("binding to {:?}", v4); let addr_bytes = v4.ip().octets(); let addr_b: u32 = ((addr_bytes[3] as u32) << 24) + ((addr_bytes[2] as u32) << 16) + ((addr_bytes[1] as u32) << 8 ) + ( addr_bytes[0] as u32); // construct a sockaddr_in sockaddr_in { sin_family: AF_INET as u16, sin_port: v4.port().to_be(), sin_addr: in_addr{s_addr: addr_b}, sin_zero: [0; 8] } } else { panic!("ipv6 not implemented (yet) in this binding"); } } #[cfg(target_os="windows")] fn get_sockaddr(name: SocketAddr) -> sockaddr_in { if let SocketAddr::V4(v4) = name { trace!("binding to {:?}", v4); let addr_bytes = v4.ip().octets(); let addr_b: u32 = ((addr_bytes[3] as u32) << 24) + ((addr_bytes[2] as u32) << 16) + ((addr_bytes[1] as u32) << 8 ) + ( addr_bytes[0] as u32); // construct a sockaddr_in sockaddr_in { sin_family: AF_INET as u16, sin_port: v4.port().to_be(), sin_addr: in_addr{S_un: addr_b}, sin_zero: [0; 8] } } else { panic!("ipv6 not implemented (yet) in this binding"); } } #[cfg(target_os="macos")] fn get_sockaddr(name: SocketAddr) -> sockaddr_in { if let SocketAddr::V4(v4) = name { trace!("binding to {:?}", v4); let addr_bytes = v4.ip().octets(); let addr_b: u32 = ((addr_bytes[3] as u32) << 24) + ((addr_bytes[2] as u32) << 16) + ((addr_bytes[1] as u32) << 8 ) + ( addr_bytes[0] as u32); // construct a sockaddr_in sockaddr_in { sin_len: std::mem::size_of::<sockaddr_in>() as u8, sin_family: AF_INET as u8, sin_port: v4.port().to_be(), sin_addr: in_addr{s_addr: addr_b}, sin_zero: [0; 8] } } else { panic!("ipv6 not implemented (yet) in this binding"); } } // sockaddr_to_SocketAddr fn sockaddr_to_socketaddr(s: sockaddr) -> SocketAddr { let fam: i32 = s.sa_family as i32; match fam { AF_INET => { let name1: sockaddr_in = unsafe{ std::mem::transmute(s) }; let ip: u32 = s_addr!(name1.sin_addr); let d: u8 = ((ip & 0xff000000) >> 24) as u8; let c: u8 = ((ip & 0xff0000) >> 16) as u8; let b: u8 = ((ip & 0xff00) >> 8) as u8; let a: u8 = ((ip & 0xff)) as u8; SocketAddr::V4(SocketAddrV4::new( std::net::Ipv4Addr::new(a, b, c, d), u16::from_be(name1.sin_port) )) }, AF_INET6 => { panic!("ipv6 not yet implemented") }, _ => panic!("unknown family type") } } impl UdtSocket { fn wrap_raw(u: raw::UDTSOCKET) -> UdtSocket { UdtSocket{_sock: u} } /// Creates a new UDT Socket. /// /// Creates a new socket. There is no limits for the number of UDT sockets in one system, as /// long as there is enough system resources. UDT supports both IPv4 and IPv6, which can be /// selected by the `address_family` parameter. /// /// Two socket types are supported in UDT: Stream for data streaming and Datagram for /// messaging. Note that UDT sockets are connection oriented in all cases. /// pub fn new(address_family: SocketFamily, ty: SocketType) -> Result<UdtSocket, UdtError> { let fd = unsafe { raw::udt_socket(address_family.get_val(), ty.get_val(), 0) }; if fd == raw::INVALID_SOCK { Err(get_last_err()) } else { Ok(UdtSocket{_sock: fd}) } } /// Binds a UDT socket to a known or an available local address. /// /// The bind method is usually to assign a UDT socket a local address, including IP address and /// port number. If INADDR_ANY is used, a proper IP address will be used once the UDT /// connection is set up. If 0 is used for the port, a randomly available port number will be /// used. The method getsockname can be used to retrieve this port number. /// /// The bind call is necessary in all cases except for a socket to listen. If bind is not /// called, UDT will automatically bind a socket to a randomly available address when a /// connection is set up. /// /// By default, UDT allows to reuse existing UDP port for new UDT sockets, unless UDT_REUSEADDR /// is set to false. When UDT_REUSEADDR is false, UDT will create an exclusive UDP port for /// this UDT socket. UDT_REUSEADDR must be called before bind. To reuse an existing UDT/UDP /// port, the new UDT socket must explicitly bind to the port. If the port is already used by a /// UDT socket with UDT_REUSEADDR as false, the new bind will return error. If 0 is passed as /// the port number, bind always creates a new port, no matter what value the UDT_REUSEADDR /// sets. /// pub fn bind(&self, name: std::net::SocketAddr) -> Result<(), UdtError> { let addr: sockaddr_in = get_sockaddr(name); let ret = unsafe { raw::udt_bind(self._sock, &addr as *const sockaddr_in as *const sockaddr, size_of::<sockaddr_in>() as i32 ) }; if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } /// Binds a UDT socket to an existing UDP socket. /// /// This second form of bind allows UDT to bind directly on an existing UDP socket. This is /// usefule for firewall traversing in certain situations: 1) a UDP socket is created and its /// address is learned from a name server, there is no need to close the UDP socket and open a /// UDT socket on the same address again; 2) for certain firewall, especially some on local /// system, the port mapping maybe changed or the "hole" may be closed when a UDP socket is /// closed and reopened, thus it is necessary to use the UDP socket directly in UDT. /// /// Use the second form of bind with caution, as it violates certain programming rules /// regarding code robustness. Once the UDP socket descriptor is passed to UDT, it MUST NOT be /// touched again. DO NOT use this unless you clearly understand how the related systems work. pub fn bind_from(&self, other: std::net::UdpSocket) -> Result<(), UdtError> { { } let ret = unsafe { raw::udt_bind2(self._sock, get_udpsock_fd(other)) }; if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } /// Connects to a server socket (in regular mode) or a peer socket (in rendezvous mode) to set /// up a UDT connection /// /// UDT is connection oriented, for both of its `Stream` and `Datagram` mode. `connect` must /// be called in order to set up a UDT connection. The name parameter is the address of the /// server or the peer side. In regular (default) client/server mode, the server side must has /// called bind and listen. In rendezvous mode, both sides must call bind and connect to each /// other at (approximately) the same time. Rendezvous connect may not be used for more than /// one connections on the same UDP port pair, in which case UDT_REUSEADDR may be set to false. /// /// UDT connect takes at least one round trip to finish. This may become a bottleneck if /// applications frequently connect and disconnect to the same address. /// /// When UDT_RCVSYN is set to false, the connect call will return immediately and perform the /// actual connection setup at background. Applications may use epoll to wait for the connect /// to complete. /// /// When connect fails, the UDT socket can still be used to connect again. However, if the /// socket was not bound before, it may be bound implicitly, as mentioned above, even if the /// connect fails. In addition, in the situation when the connect call fails, the UDT socket /// will not be automatically released, it is the applications' responsibility to close the /// socket, if the socket is not needed anymore (e.g., to re-connect). pub fn connect(&self, name: std::net::SocketAddr) -> Result<(), UdtError> { let addr = get_sockaddr(name); let ret = unsafe { raw::udt_connect(self._sock, &addr as *const sockaddr_in as *const sockaddr, size_of::<sockaddr_in>() as i32) }; trace!("connect returned {:?}", ret); if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } /// Enables a user UDT entity to wait for clients to connect. /// /// The listen method lets a UDT socket enter a listening state. The sock must call `bind` /// before a `listen` call. In addition, if the socket is enabled for rendezvous mode, neither /// listen nor accept can be used on the socket. A UDT socket can call `listen` more than /// once, in which case only the first call is effective, while all subsequent calls will be /// ignored if the socket is already in the listening state. /// /// `backlog` specifies the maximum number of pending connections. pub fn listen(&self, backlog: i32) -> Result<(), UdtError> { let ret = unsafe { raw::udt_listen(self._sock, backlog) }; if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } /// Retrieves an incoming connection. /// /// Once a UDT socket is in listening state, it accepts new connections and maintains the /// pending connections in a queue. An accept call retrieves the first connection in the queue, /// removes it from the queue, and returns the associate socket descriptor. /// /// If there is no connections in the queue when accept is called, a blocking socket will wait /// until a new connection is set up, whereas a non-blocking socket will return immediately /// with an error. /// /// The accepted sockets will inherit all proper attributes from the listening socket. /// /// # Returns /// /// Returns a tuple containing the new UdtSocket and a `SockAddr` structure containing the /// address of the new peer pub fn accept(&self) -> Result<(UdtSocket, SocketAddr), UdtError> { let mut peer = unsafe { std::mem::zeroed() }; let mut size: i32 = size_of::<sockaddr>() as i32; let ret = unsafe { raw::udt_accept(self._sock, &mut peer, &mut size) }; assert_eq!(size, size_of::<sockaddr>() as i32); if ret == raw::INVALID_SOCK { Err(get_last_err()) } else { let new_sock = UdtSocket::wrap_raw(ret); let addr = sockaddr_to_socketaddr(peer); Ok((new_sock, addr)) } } /// Close a UDT connection /// /// The close method gracefully shutdowns the UDT connection and releases all related data /// structures associated with the UDT socket. If there is no connection associated with the /// socket, close simply release the socket resources. /// /// On a blocking socket, if UDT_LINGER is non-zero, the close call will wait until all data in /// the sending buffer are sent out or the waiting time has exceeded the expiration time set by /// UDT_LINGER. However, if UDT_SYNSND is set to false (i.e., non-blocking sending), close will /// return immediately and any linger data will be sent at background until the linger timer /// expires. /// /// The closing UDT socket will send a shutdown message to the peer side so that the peer /// socket will also be closed. This is a best-effort message. If the message is not /// successfully delivered, the peer side will also be closed after a time-out. In UDT, /// shutdown is not supported. /// /// All sockets should be closed if they are not used any more. pub fn close(self) -> Result<(), UdtError> { let ret = unsafe { raw::udt_close(self._sock) }; if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } /// Retrieves the address information of the peer side of a connected UDT socket /// /// The getpeername retrieves the address of the peer side associated to the connection. The /// UDT socket must be connected at the time when this method is called. pub fn getpeername(&self) -> Result<std::net::SocketAddr, UdtError> { let mut name = unsafe { std::mem::zeroed() }; let mut size: i32 = size_of::<sockaddr>() as i32; let ret = unsafe { raw::udt_getpeername(self._sock,&mut name, &mut size) }; assert_eq!(size as usize, size_of::<sockaddr>()); if ret != raw::SUCCESS { Err(get_last_err()) } else { Ok(sockaddr_to_socketaddr(name)) } } /// Retrieves the local address associated with a UDT socket. /// /// The getsockname retrieves the local address associated with the socket. The UDT socket must /// be bound explicitly (via bind) or implicitly (via connect), otherwise this method will fail /// because there is no meaningful address bound to the socket. /// /// If getsockname is called after an explicit bind, but before connect, the IP address /// returned will be exactly the IP address that is used for bind and it may be 0.0.0.0 if /// ADDR_ANY is used. If getsockname is called after connect, the IP address returned will be /// the address that the peer socket sees. In the case when there is a proxy (e.g., NAT), the /// IP address returned will be the translated address by the proxy, but not a local address. /// If there is no proxy, the IP address returned will be a local address. In either case, the /// port number is local (i.e, not the translated proxy port). /// /// Because UDP is connection-less, using getsockname on a UDP port will almost always return /// 0.0.0.0 as IP address (unless it is bound to an explicit IP) . As a connection oriented /// protocol, UDT will return a meaningful IP address by getsockname if there is no proxy /// translation exist. /// /// UDT has no multihoming support yet. When there are multiple local addresses and more than /// one of them can be routed to the destination address, UDT may not behave properly due to /// the multi-path effect. In this case, the UDT socket must be explicitly bound to one of /// the local addresses. pub fn getsockname(&self) -> Result<std::net::SocketAddr, UdtError> { let mut name = unsafe { std::mem::zeroed() }; let mut size: i32 = size_of::<sockaddr>() as i32; let ret = unsafe { raw::udt_getsockname(self._sock,&mut name, &mut size) }; assert_eq!(size as usize, size_of::<sockaddr>()); if ret != raw::SUCCESS { Err(get_last_err()) } else { Ok(sockaddr_to_socketaddr(name)) } } /// Sends a message to the peer side. /// /// The sendmsg method sends a message to the peer side. The UDT socket must be in SOCK_DGRAM /// mode in order to send or receive messages. Message is the minimum data unit in this /// situation. In particular, sendmsg always tries to send the message out as a whole, that is, /// the message will either to completely sent or it is not sent at all. /// /// In blocking mode (default), sendmsg waits until there is enough space to hold the whole /// message. In non-blocking mode, sendmsg returns immediately and returns error if no buffer /// space available. /// /// If UDT_SNDTIMEO is set and the socket is in blocking mode, sendmsg only waits a limited /// time specified by UDT_SNDTIMEO option. If there is still no buffer space available when the /// timer expires, error will be returned. UDT_SNDTIMEO has no effect for non-blocking socket. /// /// The ttl parameter gives the message a limited life time, which starts counting once the /// first packet of the message is sent out. If the message has not been delivered to the /// receiver after the TTL timer expires and each packet in the message has been sent out at /// least once, the message will be discarded. Lost packets in the message will be /// retransmitted before TTL expires. /// /// On the other hand, the inorder option decides if this message should be delivered in order. /// That is, the message should not be delivered to the receiver side application unless all /// messages prior to it are either delivered or discarded. /// /// Finally, if the message size is greater than the size of the receiver buffer, the message /// will never be received in whole by the receiver side. Only the beginning part that can be /// hold in the receiver buffer may be read and the rest will be discarded. /// /// # Returns /// /// On success, sendmsg returns the actual size of message that has just been sent. The size /// should be equal to len. Otherwise UDT::ERROR is returned and specific error information can /// be retrieved by getlasterror. If UDT_SNDTIMEO is set to a positive value, zero will be /// returned if the message cannot be sent before the timer expires. pub fn sendmsg(&self, buf: &[u8]) -> Result<i32, UdtError> { let ret = unsafe { raw::udt_sendmsg(self._sock, buf.as_ptr(), buf.len() as i32, -1 as i32, 1 as i32) }; if ret == raw::UDT_ERROR { Err(get_last_err()) } else { Ok(ret) } } /// Sends out a certain amount of data from an application buffer. /// /// The send method sends certain amount of data from the application buffer. If the the size /// limit of sending buffer queue is reached, send only sends a portion of the application /// buffer and returns the actual size of data that has been sent. /// /// In blocking mode (default), send waits until there is some sending buffer space available. /// In non-blocking mode, send returns immediately and returns error if the sending queue limit /// is already limited. /// /// If UDT_SNDTIMEO is set and the socket is in blocking mode, send only waits a limited time /// specified by UDT_SNDTIMEO option. If there is still no buffer space available when the /// timer expires, error will be returned. UDT_SNDTIMEO has no effect for non-blocking socket. /// /// # Returns /// /// On success, returns the actual size of the data that as been sent. Otherwise, a UdtError /// is returned with specific error information. /// /// If UDT_SNDTIMEO is set to a positive value, zero will be returned if no data is sent before /// the time expires. pub fn send(&self, buf: &[u8]) -> Result<i32, UdtError> { let ret = unsafe { raw::udt_send(self._sock, buf.as_ptr(), buf.len() as i32, 0) }; if ret == raw::UDT_ERROR { Err(get_last_err()) } else { Ok(ret) } } /// The recvmsg method receives a valid message. /// /// The recvmsg method reads a message from the protocol buffer. The UDT socket must be in /// SOCK_DGRAM mode in order to send or receive messages. Message is the minimum data unit in /// this situation. Each recvmsg will read no more than one message, even if the message is /// smaller than the size of buf and there are more messages available. On the other hand, if /// the buf is not enough to hold the first message, only part of the message will be copied /// into the buffer, but the message will still be discarded after this recvmsg call. /// /// In blocking mode (default), recvmsg waits until there is a valid message received into the /// receiver buffer. In non-blocking mode, recvmsg returns immediately and returns error if no /// message available. /// /// If UDT_RCVTIMEO is set and the socket is in blocking mode, recvmsg only waits a limited /// time specified by UDT_RCVTIMEO option. If there is still no message available when the /// timer expires, error will be returned. UDT_RCVTIMEO has no effect for non-blocking socket. /// /// # Returns /// /// On success, recvmsg returns the actual size of received message. Otherwise UDT::ERROR is /// returned and specific error information can be retrieved by getlasterror. If UDT_RCVTIMEO /// is set to a positive value, zero will be returned if no message is received before the /// timer expires. pub fn recvmsg(&self, buf: &mut [u8]) -> Result<usize, UdtError> { let ret = unsafe { raw::udt_recvmsg(self._sock, buf.as_mut_ptr(), buf.len() as i32) }; if ret > 0 { Ok(ret as usize) } else { Err(get_last_err()) } } /// Reads a certain amount of data into a local memory buffer. /// /// The recv method reads certain amount of data from the protocol buffer. If there is not /// enough data in the buffer, recv only reads the available data in the protocol buffer and /// returns the actual size of data received. However, recv will never read more data than the /// buffer size indicates by len. /// /// In blocking mode (default), recv waits until there is some data received into the receiver /// buffer. In non-blocking mode, recv returns immediately and returns error if no data /// available. /// /// If UDT_RCVTIMEO is set and the socket is in blocking mode, recv only waits a limited time /// specified by UDT_RCVTIMEO option. If there is still no data available when the timer /// expires, error will be returned. UDT_RCVTIMEO has no effect for non-blocking socket. pub fn recv(&self, buf: &mut [u8], len: usize) -> Result<i32, UdtError> { let ret = unsafe { raw::udt_recv(self._sock, buf.as_mut_ptr(), len as i32, 0) }; if ret == raw::UDT_ERROR { Err(get_last_err()) } else { Ok(ret) } } /// Gets UDT options /// /// See the [`UdtOpts`][1] module for all the supported option types. /// /// [1]: UdtOpts/index.html /// /// # Example /// /// ``` /// use udt::*; /// /// let sock = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); /// let recv_buf: i32 = sock.getsockopt(UdtOpts::UDP_RCVBUF).unwrap(); /// ``` pub fn getsockopt<B: Default, T: UdtOption<B>>(&self, opt: T) -> Result<B, UdtError> { let mut val: B = unsafe{ std::mem::zeroed() }; let val_p: *mut B = &mut val; let ty: raw::UDTOpt = opt.get_type(); let mut size: c_int = size_of::<B>() as i32; let ret = unsafe { raw::udt_getsockopt(self._sock, 0, ty, val_p as *mut libc::c_void, &mut size) }; if ret == raw::SUCCESS { Ok(val) } else { Err(get_last_err()) } } /// Sets UDT options /// /// See the [`UdtOpts`][1] module for all the supported option types. /// [1]: UdtOpts/index.html pub fn setsockopt<B, T: UdtOption<B>>(&self, opt: T, value: B) -> Result<(), UdtError> { let ty: raw::UDTOpt = opt.get_type(); let val_p: *const B = &value; let size: c_int = size_of::<B>() as i32; let ret = unsafe { raw::udt_setsockopt(self._sock, 0, ty, val_p as *const libc::c_void, size) }; if ret == raw::SUCCESS { Ok(()) } else { Err(get_last_err()) } } pub fn getstate(&self) -> UdtStatus { unsafe { raw::udt_getsockstate(self._sock) } } } /// Used with the `epoll*` methods of a UDTSocket /// /// The epoll functions provides a highly scalable and efficient way to wait for UDT sockets IO /// events. It should be used instead of select and selectEx when the application needs to wait for /// a very large number of sockets. In addition, epoll also offers to wait on system sockets at the /// same time, which can be convenient when an application uses both UDT and TCP/UDP. /// /// Applications should use [`Epoll::create`][1] to create an epoll ID and use [`add_usock`][2]/ssock and /// [`remove_usock`][3]/ssock to add/remove sockets. If a socket is already in the epoll set, it /// will be ignored if being added again. Adding invalid or closed sockets will cause error. /// However, they will simply be ignored without any error returned when being removed. /// /// Multiple epoll entities can be created and there is no upper limits as long as system resource /// allows. There is also no hard limit on the number of UDT sockets. The number system descriptors /// supported by UDT::epoll are platform dependent. /// /// For system sockets on Linux, developers may choose to watch individual events from EPOLLIN /// (read), EPOLLOUT (write), and EPOLLERR (exceptions). When using epoll_remove_ssock, if the /// socket is waiting on multiple events, only those specified in events are removed. The events /// can be a combination (with "|" operation) of any of the following values. /// /// [1]: #method.create /// [2]: #method.add_usock /// [3]: #method.remove_usock /// #[derive(Debug)] pub struct Epoll { eid: c_int, // poll requires us to pass in an array to receive a list of sockets. // instead of allocating one every time we call into poll, we create // two vecs and re-use them. this means that while the UDT api is // thread safe, this impl of epoll is not rd_vec: Vec<c_int>, wr_vec: Vec<c_int> } impl Epoll { /// Creates a new Epoll object pub fn create() -> Result<Epoll, UdtError> { let ret = unsafe { raw::udt_epoll_create() }; if ret < 0 { Err(get_last_err()) } else { Ok(Epoll{eid: ret, rd_vec: Vec::new(), wr_vec: Vec::new()}) } } /// Adds a UdtSocket to an epoll /// /// `events` can be any combination of `UDT_EPOLL_IN`, `UDT_EPOLL_OUT`, and `UDT_EPOLL_ERR` pub fn add_usock(&mut self, socket: &UdtSocket, events: Option<EpollEvents>) -> Result<(), UdtError> { use std::ptr::null; let ret = match events { None => unsafe { raw::udt_epoll_add_usock(self.eid, socket._sock, null()) }, Some(val) => { let b: c_int = val.bits(); unsafe { raw::udt_epoll_add_usock(self.eid, socket._sock, &b) } } }; if ret == 0 { trace!("Added UdpSocket={} to epoll", socket._sock); self.wr_vec.push(-1); self.rd_vec.push(-1); Ok(()) } else { Err(get_last_err()) } } /// Removes a UdtSocket from an epoll /// /// If the socket isn't part of the epoll, there is no error pub fn remove_usock(&self, socket: &UdtSocket) -> Result<(), UdtError> { let ret = unsafe { raw::udt_epoll_remove_usock(self.eid, socket._sock) }; if ret == 0 { Ok(()) } else { Err(get_last_err()) } } /// Wait for events /// /// Timeout is in milliseconds. If negative, wait forever. If zero, return immediately. /// /// If `write` is false, the list of sockets for writing will always be null. /// /// # Returns /// /// A tuple of sockets to be read and sockets to be written (or have exceptions) pub fn wait(&mut self, timeout: i64, write: bool) -> Result<(Vec<UdtSocket>, Vec<UdtSocket>), UdtError> { use std::ptr::null_mut; let mut rnum : c_int = self.rd_vec.len() as c_int; let mut wnum : c_int= self.wr_vec.len() as c_int; let wr_vec_ptr = if !write { wnum = 0; std::ptr::null_mut() } else { self.wr_vec.as_mut_ptr() }; let ret = unsafe { raw::udt_epoll_wait2(self.eid, self.rd_vec.as_mut_ptr(), &mut rnum, wr_vec_ptr, &mut wnum, timeout, null_mut(), null_mut(), null_mut(), null_mut() // no support for polling sys sockets right now ) }; trace!("epoll returned {:?}", ret); trace!("rnum={}, wnum={}", rnum, wnum); if ret < 0 { let e = get_last_err(); if e.err_code != 6003 { return Err(get_last_err()); } else { rnum = 0; wnum = 0; } } for v in 0..rnum { trace!("rnum[{}] = {}", v, self.rd_vec[v as usize]); } for v in 0..wnum { trace!("wnum[{}] = {}", v, self.wr_vec[v as usize]); } let mut rds = Vec::with_capacity(rnum as usize); rds.extend(self.rd_vec.iter().take(rnum as usize).map(|&x| UdtSocket::wrap_raw(x))); let mut wrs = Vec::with_capacity(wnum as usize); wrs.extend(self.wr_vec.iter().take(wnum as usize).map(|&x| UdtSocket::wrap_raw(x))); Ok( (rds, wrs) ) } } #[test] fn test_udt_socket() { init(); let _ = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); } #[test] fn test_udt_bind() { use std::net::Ipv4Addr; use std::str::FromStr; init(); let sock = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); let localhost = Ipv4Addr::from_str("127.0.0.1").unwrap(); if cfg!(target_os="macos") { trace!("Lowering buffer sizes on OSX"); sock.setsockopt(UdtOpts::UDP_RCVBUF, 8192).unwrap(); sock.setsockopt(UdtOpts::UDP_SNDBUF, 8192).unwrap(); } sock.bind(SocketAddr::V4(SocketAddrV4::new(localhost, 0))).or_else(|e| Err(panic!("Failed to bind to {:?} --> {:?}", localhost, e))); } #[test] fn test_udt_socket_state() { use std::net::Ipv4Addr; use std::str::FromStr; use std::thread::sleep; use std::time::Duration; init(); let sock = UdtSocket::new(SocketFamily::AFInet, SocketType::Stream).unwrap(); assert_eq!(sock.getstate(), UdtStatus::INIT); if cfg!(target_os="macos") { trace!("Lowering buffer sizes on OSX"); sock.setsockopt(UdtOpts::UDP_RCVBUF, 8192).unwrap(); sock.setsockopt(UdtOpts::UDP_SNDBUF, 8192).unwrap(); } let localhost = Ipv4Addr::from_str("127.0.0.1").unwrap(); sock.bind(SocketAddr::V4(SocketAddrV4::new(localhost, 0))).or_else(|e| Err(panic!("Failed to bind to {:?} --> {:?}", localhost, e))); assert_eq!(sock.getstate(), UdtStatus::OPENED); sock.listen(5).unwrap(); assert_eq!(sock.getstate(), UdtStatus::LISTENING); sock.close().unwrap(); assert_eq!(sock.getstate(), UdtStatus::BROKEN); sleep(Duration::from_millis(4500)); // after some time, the sock transitions to CLOSED and then NONEXIST // THe LISTENING -> CLOSED transition is made after a 3 second timeout assert!(sock.getstate() == UdtStatus::NONEXIST || sock.getstate() == UdtStatus::CLOSED); }