library/std/src/sys/vxworks/net.rs

   1 #[cfg(all(test, taget_env = "gnu"))]
   2 mod tests;
   3
   4 use crate::cmp;
   5 use crate::ffi::CStr;
   6 use crate::io;
   7 use crate::io::{IoSlice, IoSliceMut};
   8 use crate::mem;
   9 use crate::net::{Shutdown, SocketAddr};
  10 use crate::str;
  11 use crate::sys::fd::FileDesc;
  12 use crate::sys_common::net::{getsockopt, setsockopt, sockaddr_to_addr};
  13 use crate::sys_common::{AsInner, FromInner, IntoInner};
  14 use crate::time::{Duration, Instant};
  15 use libc::{self, c_int, c_void, size_t, sockaddr, socklen_t, EAI_SYSTEM, MSG_PEEK};
  16
  17 pub use crate::sys::{cvt, cvt_r};
  18
  19 #[allow(unused_extern_crates)]
  20 pub extern crate libc as netc;
  21
  22 pub type wrlen_t = size_t;
  23
  24 pub struct Socket(FileDesc);
  25
  26 pub fn init() {}
  27
  28 pub fn cvt_gai(err: c_int) -> io::Result<()> {
  29     if err == 0 {
  30         return Ok(());
  31     }
  32
  33     // We may need to trigger a glibc workaround. See on_resolver_failure() for details.
  34     on_resolver_failure();
  35
  36     if err == EAI_SYSTEM {
  37         return Err(io::Error::last_os_error());
  38     }
  39
  40     let detail = unsafe {
  41         str::from_utf8(CStr::from_ptr(libc::gai_strerror(err)).to_bytes()).unwrap().to_owned()
  42     };
  43     Err(io::Error::new(
  44         io::ErrorKind::Other,
  45         &format!("failed to lookup address information: {}", detail)[..],
  46     ))
  47 }
  48
  49 impl Socket {
  50     pub fn new(addr: &SocketAddr, ty: c_int) -> io::Result<Socket> {
  51         let fam = match *addr {
  52             SocketAddr::V4(..) => libc::AF_INET,
  53             SocketAddr::V6(..) => libc::AF_INET6,
  54         };
  55         Socket::new_raw(fam, ty)
  56     }
  57
  58     pub fn new_raw(fam: c_int, ty: c_int) -> io::Result<Socket> {
  59         unsafe {
  60             let fd = cvt(libc::socket(fam, ty, 0))?;
  61             let fd = FileDesc::new(fd);
  62             fd.set_cloexec()?;
  63             let socket = Socket(fd);
  64             Ok(socket)
  65         }
  66     }
  67
  68     pub fn new_pair(_fam: c_int, _ty: c_int) -> io::Result<(Socket, Socket)> {
  69         unimplemented!();
  70     }
  71
  72     pub fn connect_timeout(&self, addr: &SocketAddr, timeout: Duration) -> io::Result<()> {
  73         self.set_nonblocking(true)?;
  74         let r = unsafe {
  75             let (addrp, len) = addr.into_inner();
  76             cvt(libc::connect(self.0.raw(), addrp, len))
  77         };
  78         self.set_nonblocking(false)?;
  79
  80         match r {
  81             Ok(_) => return Ok(()),
  82             // there's no ErrorKind for EINPROGRESS :(
  83             Err(ref e) if e.raw_os_error() == Some(libc::EINPROGRESS) => {}
  84             Err(e) => return Err(e),
  85         }
  86
  87         let mut pollfd = libc::pollfd { fd: self.0.raw(), events: libc::POLLOUT, revents: 0 };
  88
  89         if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
  90             return Err(io::Error::new(
  91                 io::ErrorKind::InvalidInput,
  92                 "cannot set a 0 duration timeout",
  93             ));
  94         }
  95
  96         let start = Instant::now();
  97
  98         loop {
  99             let elapsed = start.elapsed();
 100             if elapsed >= timeout {
 101                 return Err(io::Error::new(io::ErrorKind::TimedOut, "connection timed out"));
 102             }
 103
 104             let timeout = timeout - elapsed;
 105             let mut timeout = timeout
 106                 .as_secs()
 107                 .saturating_mul(1_000)
 108                 .saturating_add(timeout.subsec_nanos() as u64 / 1_000_000);
 109             if timeout == 0 {
 110                 timeout = 1;
 111             }
 112
 113             let timeout = cmp::min(timeout, c_int::MAX as u64) as c_int;
 114
 115             match unsafe { libc::poll(&mut pollfd, 1, timeout) } {
 116                 -1 => {
 117                     let err = io::Error::last_os_error();
 118                     if err.kind() != io::ErrorKind::Interrupted {
 119                         return Err(err);
 120                     }
 121                 }
 122                 0 => {}
 123                 _ => {
 124                     // linux returns POLLOUT|POLLERR|POLLHUP for refused connections (!), so look
 125                     // for POLLHUP rather than read readiness
 126                     if pollfd.revents & libc::POLLHUP != 0 {
 127                         let e = self.take_error()?.unwrap_or_else(|| {
 128                             io::Error::new(io::ErrorKind::Other, "no error set after POLLHUP")
 129                         });
 130                         return Err(e);
 131                     }
 132
 133                     return Ok(());
 134                 }
 135             }
 136         }
 137     }
 138
 139     pub fn accept(&self, storage: *mut sockaddr, len: *mut socklen_t) -> io::Result<Socket> {
 140         let fd = cvt_r(|| unsafe { libc::accept(self.0.raw(), storage, len) })?;
 141         let fd = FileDesc::new(fd);
 142         fd.set_cloexec()?;
 143         Ok(Socket(fd))
 144     }
 145
 146     pub fn duplicate(&self) -> io::Result<Socket> {
 147         self.0.duplicate().map(Socket)
 148     }
 149
 150     fn recv_with_flags(&self, buf: &mut [u8], flags: c_int) -> io::Result<usize> {
 151         let ret = cvt(unsafe {
 152             libc::recv(self.0.raw(), buf.as_mut_ptr() as *mut c_void, buf.len(), flags)
 153         })?;
 154         Ok(ret as usize)
 155     }
 156
 157     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
 158         self.recv_with_flags(buf, 0)
 159     }
 160
 161     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
 162         self.recv_with_flags(buf, MSG_PEEK)
 163     }
 164
 165     pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
 166         self.0.read_vectored(bufs)
 167     }
 168
 169     #[inline]
 170     pub fn is_read_vectored(&self) -> bool {
 171         self.0.is_read_vectored()
 172     }
 173
 174     fn recv_from_with_flags(
 175         &self,
 176         buf: &mut [u8],
 177         flags: c_int,
 178     ) -> io::Result<(usize, SocketAddr)> {
 179         let mut storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
 180         let mut addrlen = mem::size_of_val(&storage) as libc::socklen_t;
 181
 182         let n = cvt(unsafe {
 183             libc::recvfrom(
 184                 self.0.raw(),
 185                 buf.as_mut_ptr() as *mut c_void,
 186                 buf.len(),
 187                 flags,
 188                 &mut storage as *mut _ as *mut _,
 189                 &mut addrlen,
 190             )
 191         })?;
 192         Ok((n as usize, sockaddr_to_addr(&storage, addrlen as usize)?))
 193     }
 194
 195     pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
 196         self.recv_from_with_flags(buf, 0)
 197     }
 198
 199     pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
 200         self.recv_from_with_flags(buf, MSG_PEEK)
 201     }
 202
 203     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
 204         self.0.write(buf)
 205     }
 206
 207     pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
 208         self.0.write_vectored(bufs)
 209     }
 210
 211     #[inline]
 212     pub fn is_write_vectored(&self) -> bool {
 213         self.0.is_write_vectored()
 214     }
 215
 216     pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
 217         let timeout = match dur {
 218             Some(dur) => {
 219                 if dur.as_secs() == 0 && dur.subsec_nanos() == 0 {
 220                     return Err(io::Error::new(
 221                         io::ErrorKind::InvalidInput,
 222                         "cannot set a 0 duration timeout",
 223                     ));
 224                 }
 225
 226                 let secs = if dur.as_secs() > libc::time_t::MAX as u64 {
 227                     libc::time_t::MAX
 228                 } else {
 229                     dur.as_secs() as libc::time_t
 230                 };
 231                 let mut timeout = libc::timeval {
 232                     tv_sec: secs,
 233                     tv_usec: (dur.subsec_nanos() / 1000) as libc::suseconds_t,
 234                 };
 235                 if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
 236                     timeout.tv_usec = 1;
 237                 }
 238                 timeout
 239             }
 240             None => libc::timeval { tv_sec: 0, tv_usec: 0 },
 241         };
 242         setsockopt(self, libc::SOL_SOCKET, kind, timeout)
 243     }
 244
 245     pub fn timeout(&self, kind: libc::c_int) -> io::Result<Option<Duration>> {
 246         let raw: libc::timeval = getsockopt(self, libc::SOL_SOCKET, kind)?;
 247         if raw.tv_sec == 0 && raw.tv_usec == 0 {
 248             Ok(None)
 249         } else {
 250             let sec = raw.tv_sec as u64;
 251             let nsec = (raw.tv_usec as u32) * 1000;
 252             Ok(Some(Duration::new(sec, nsec)))
 253         }
 254     }
 255
 256     pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
 257         let how = match how {
 258             Shutdown::Write => libc::SHUT_WR,
 259             Shutdown::Read => libc::SHUT_RD,
 260             Shutdown::Both => libc::SHUT_RDWR,
 261         };
 262         cvt(unsafe { libc::shutdown(self.0.raw(), how) })?;
 263         Ok(())
 264     }
 265
 266     pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
 267         setsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY, nodelay as c_int)
 268     }
 269
 270     pub fn nodelay(&self) -> io::Result<bool> {
 271         let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY)?;
 272         Ok(raw != 0)
 273     }
 274
 275     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
 276         let mut nonblocking = nonblocking as libc::c_int;
 277         cvt(unsafe { libc::ioctl(*self.as_inner(), libc::FIONBIO, &mut nonblocking) }).map(drop)
 278     }
 279
 280     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
 281         let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?;
 282         if raw == 0 { Ok(None) } else { Ok(Some(io::Error::from_raw_os_error(raw as i32))) }
 283     }
 284 }
 285
 286 impl AsInner<c_int> for Socket {
 287     fn as_inner(&self) -> &c_int {
 288         self.0.as_inner()
 289     }
 290 }
 291
 292 impl FromInner<c_int> for Socket {
 293     fn from_inner(fd: c_int) -> Socket {
 294         Socket(FileDesc::new(fd))
 295     }
 296 }
 297
 298 impl IntoInner<c_int> for Socket {
 299     fn into_inner(self) -> c_int {
 300         self.0.into_raw()
 301     }
 302 }
 303
 304 // In versions of glibc prior to 2.26, there's a bug where the DNS resolver
 305 // will cache the contents of /etc/resolv.conf, so changes to that file on disk
 306 // can be ignored by a long-running program. That can break DNS lookups on e.g.
 307 // laptops where the network comes and goes. See
 308 // https://sourceware.org/bugzilla/show_bug.cgi?id=984. Note however that some
 309 // distros including Debian have patched glibc to fix this for a long time.
 310 //
 311 // A workaround for this bug is to call the res_init libc function, to clear
 312 // the cached configs. Unfortunately, while we believe glibc's implementation
 313 // of res_init is thread-safe, we know that other implementations are not
 314 // (https://github.com/rust-lang/rust/issues/43592). Code here in libstd could
 315 // try to synchronize its res_init calls with a Mutex, but that wouldn't
 316 // protect programs that call into libc in other ways. So instead of calling
 317 // res_init unconditionally, we call it only when we detect we're linking
 318 // against glibc version < 2.26. (That is, when we both know its needed and
 319 // believe it's thread-safe).
 320 #[cfg(target_env = "gnu")]
 321 fn on_resolver_failure() {
 322     /*
 323     use crate::sys;
 324
 325     // If the version fails to parse, we treat it the same as "not glibc".
 326     if let Some(version) = sys::os::glibc_version() {
 327         if version < (2, 26) {
 328             unsafe { libc::res_init() };
 329         }
 330     }
 331     */
 332 }
 333
 334 #[cfg(not(target_env = "gnu"))]
 335 fn on_resolver_failure() {}