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use crate::net::{SocketAddr, TcpListener, TcpStream, ToSocketAddrs, UdpSocket};
use cap_primitives::{ambient_authority, net::NO_SOCKET_ADDRS, AmbientAuthority};
use std::{io, net, time::Duration};
/// A pool of network addresses.
///
/// This does not directly correspond to anything in `std`, however its methods
/// correspond to the several functions in [`std::net`].
#[derive(Clone)]
pub struct Pool {
cap: cap_primitives::net::Pool,
}
impl Pool {
/// Construct a new empty pool.
pub fn new() -> Self {
Self {
cap: cap_primitives::net::Pool::new(),
}
}
/// Add a range of network addresses with a specific port to the pool.
///
/// # AmbientAuthority
///
/// This function allows ambient access to any IP address.
pub fn insert_ip_net(
&mut self,
ip_net: ipnet::IpNet,
port: u16,
ambient_authority: AmbientAuthority,
) {
self.cap.insert_ip_net(ip_net, port, ambient_authority)
}
/// Add a specific [`net::SocketAddr`] to the pool.
///
/// # AmbientAuthority
///
/// This function allows ambient access to any IP address.
pub fn insert_socket_addr(
&mut self,
addr: net::SocketAddr,
ambient_authority: AmbientAuthority,
) {
self.cap.insert_socket_addr(addr, ambient_authority)
}
/// Creates a new `TcpListener` which will be bound to the specified address.
///
/// This corresponds to [`std::net::TcpListener::bind`].
#[inline]
pub fn bind_tcp_listener<A: ToSocketAddrs>(&self, addr: A) -> io::Result<TcpListener> {
let addrs = addr.to_socket_addrs()?;
let mut last_err = None;
for addr in addrs {
self.cap.check_addr(&addr)?;
// TODO: when compiling for WASI, use WASI-specific methods instead
match net::TcpListener::bind(addr) {
Ok(tcp_listener) => {
return Ok(TcpListener::from_std(tcp_listener, ambient_authority()))
}
Err(e) => last_err = Some(e),
}
}
match last_err {
Some(e) => Err(e),
None => Err(net::TcpListener::bind(NO_SOCKET_ADDRS).unwrap_err()),
}
}
/// Opens a TCP connection to a remote host.
///
/// This corresponds to [`std::net::TcpStream::connect`].
#[inline]
pub fn connect_tcp_stream<A: ToSocketAddrs>(&self, addr: A) -> io::Result<TcpStream> {
let addrs = addr.to_socket_addrs()?;
let mut last_err = None;
for addr in addrs {
self.cap.check_addr(&addr)?;
// TODO: when compiling for WASI, use WASI-specific methods instead
match net::TcpStream::connect(addr) {
Ok(tcp_stream) => return Ok(TcpStream::from_std(tcp_stream, ambient_authority())),
Err(e) => last_err = Some(e),
}
}
match last_err {
Some(e) => Err(e),
None => Err(net::TcpStream::connect(NO_SOCKET_ADDRS).unwrap_err()),
}
}
/// Opens a TCP connection to a remote host with a timeout.
///
/// This corresponds to [`std::net::TcpStream::connect_timeout`].
#[inline]
pub fn connect_timeout_tcp_stream(
&self,
addr: &SocketAddr,
timeout: Duration,
) -> io::Result<TcpStream> {
self.cap.check_addr(addr)?;
let tcp_stream = net::TcpStream::connect_timeout(addr, timeout)?;
Ok(TcpStream::from_std(tcp_stream, ambient_authority()))
}
/// Creates a UDP socket from the given address.
///
/// This corresponds to [`std::net::UdpSocket::bind`].
#[inline]
pub fn bind_udp_socket<A: ToSocketAddrs>(&self, addr: A) -> io::Result<UdpSocket> {
let addrs = addr.to_socket_addrs()?;
let mut last_err = None;
for addr in addrs {
self.cap.check_addr(&addr)?;
match net::UdpSocket::bind(addr) {
Ok(udp_socket) => return Ok(UdpSocket::from_std(udp_socket, ambient_authority())),
Err(e) => last_err = Some(e),
}
}
match last_err {
Some(e) => Err(e),
None => Err(net::UdpSocket::bind(NO_SOCKET_ADDRS).unwrap_err()),
}
}
/// Sends data on the socket to the given address. On success, returns the
/// number of bytes written.
///
/// This corresponds to [`std::net::UdpSocket::send_to`].
#[inline]
pub fn send_to_udp_socket_addr<A: ToSocketAddrs>(
&self,
udp_socket: &UdpSocket,
buf: &[u8],
addr: A,
) -> io::Result<usize> {
let mut addrs = addr.to_socket_addrs()?;
// `UdpSocket::send_to` only sends to the first address.
let addr = addrs
.next()
.ok_or_else(|| net::UdpSocket::bind(NO_SOCKET_ADDRS).unwrap_err())?;
self.cap.check_addr(&addr)?;
udp_socket.std.send_to(buf, addr)
}
/// Connects this UDP socket to a remote address, allowing the `send` and
/// `recv` syscalls to be used to send data and also applies filters to
/// only receive data from the specified address.
///
/// This corresponds to [`std::net::UdpSocket::connect`].
#[inline]
pub fn connect_udp_socket<A: ToSocketAddrs>(
&self,
udp_socket: &UdpSocket,
addr: A,
) -> io::Result<()> {
let addrs = addr.to_socket_addrs()?;
let mut last_err = None;
for addr in addrs {
self.cap.check_addr(&addr)?;
match udp_socket.std.connect(addr) {
Ok(()) => return Ok(()),
Err(e) => last_err = Some(e),
}
}
match last_err {
Some(e) => Err(e),
None => Err(net::UdpSocket::bind(NO_SOCKET_ADDRS).unwrap_err()),
}
}
}