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#![warn(missing_docs, unused_import_braces, unused_extern_crates)]
use myutil::{err::*, *};
use nix::{
sys::socket::{
bind, listen, recvfrom, sendto, setsockopt, socket, sockopt,
AddressFamily, InetAddr, MsgFlags, SockAddr, SockFlag, SockType,
},
unistd::close,
};
use std::{mem, net::SocketAddr, os::unix::io::RawFd, sync::Arc};
const DATA_BUF_SIZE_LIMIT: usize = 8 * 1024 * 1024;
const RECV_BUF_SIZE_LIMIT: usize = 64 * 1024 * 1024;
#[derive(Debug, Eq, Hash, PartialEq)]
pub struct Hdr {
fd: RawFd,
}
impl Hdr {
#[inline(always)]
fn new(fd: RawFd) -> Hdr {
Hdr { fd }
}
#[inline(always)]
pub fn sendto(&self, data: &[u8], peeraddr: &PeerAddr) -> Result<usize> {
sendto(self.fd, data, &peeraddr.addr, MsgFlags::empty()).c(d!())
}
#[inline(always)]
fn recvfrom(&self, data: &mut [u8]) -> Result<(usize, Option<SockAddr>)> {
recvfrom(self.fd, data).c(d!())
}
}
impl Drop for Hdr {
fn drop(&mut self) {
info_omit!(close(self.fd));
}
}
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub struct PeerAddr {
addr: SockAddr,
}
impl PeerAddr {
#[inline(always)]
fn new(addr: SockAddr) -> Self {
PeerAddr { addr }
}
}
pub fn start_server(
addr: &str,
data_bs: Option<usize>,
cb: impl Fn(&[u8], Arc<Hdr>, PeerAddr) -> Result<()>,
keep_alive: bool,
) -> Result<()> {
let mut siz = data_bs.unwrap_or(4096);
alt!(siz > DATA_BUF_SIZE_LIMIT, siz = DATA_BUF_SIZE_LIMIT);
let hdr = gen_hdr(addr, 256 * siz, keep_alive).c(d!())?;
let mut buf = vec![0; siz].into_boxed_slice();
loop {
if let Ok((size, Some(peer))) = info!(hdr.recvfrom(&mut buf)) {
info_omit!(cb(
&buf[0..size],
Arc::clone(&hdr),
PeerAddr::new(peer)
));
}
}
}
fn gen_hdr(addr: &str, recv_bs: usize, keep_alive: bool) -> Result<Arc<Hdr>> {
let recv_bs =
alt!(recv_bs > RECV_BUF_SIZE_LIMIT, RECV_BUF_SIZE_LIMIT, recv_bs);
let fd = socket(
AddressFamily::Inet,
SockType::SeqPacket,
SockFlag::empty(),
None,
)
.c(d!())?;
if keep_alive {
disable_sctp_autoclose(fd).c(d!())?;
}
setsockopt(fd, sockopt::ReuseAddr, &true).c(d!())?;
setsockopt(fd, sockopt::ReusePort, &true).c(d!())?;
setsockopt(fd, sockopt::RcvBuf, &recv_bs).c(d!())?;
addr.parse::<SocketAddr>()
.c(d!())
.map(|addr| SockAddr::new_inet(InetAddr::from_std(&addr)))
.and_then(|addr| bind(fd, &addr).c(d!()))
.and_then(|_| listen(fd, 6).c(d!()))
.map(|_| Arc::new(Hdr::new(fd)))
}
#[inline(always)]
fn disable_sctp_autoclose(fd: RawFd) -> Result<()> {
const SOL_SCTP: libc::c_int = 132;
const SCTP_AUTOCLOSE: libc::c_int = 4;
const DISABLE_AUTOCLOSE: libc::c_int = 0;
if 0 != unsafe {
libc::setsockopt(
fd,
SOL_SCTP,
SCTP_AUTOCLOSE,
&DISABLE_AUTOCLOSE as *const libc::c_int as *const libc::c_void,
mem::size_of::<libc::c_int>() as libc::socklen_t,
)
} {
return Err(eg!("Fail to disable 'SCTP_AUTOCLOSE' !!!"));
}
Ok(())
}