wasmer_wasix/syscalls/wasix/
sock_connect.rs

1use super::*;
2use crate::syscalls::*;
3
4/// ### `sock_connect()`
5/// Initiate a connection on a socket to the specified address
6///
7/// Polling the socket handle will wait for data to arrive or for
8/// the socket status to change which can be queried via 'sock_status'
9///
10/// Note: This is similar to `connect` in POSIX
11///
12/// ## Parameters
13///
14/// * `fd` - Socket descriptor
15/// * `addr` - Address of the socket to connect to
16#[instrument(level = "trace", skip_all, fields(%sock, addr = field::Empty), ret)]
17pub fn sock_connect<M: MemorySize>(
18    mut ctx: FunctionEnvMut<'_, WasiEnv>,
19    sock: WasiFd,
20    addr: WasmPtr<__wasi_addr_port_t, M>,
21) -> Result<Errno, WasiError> {
22    WasiEnv::do_pending_operations(&mut ctx)?;
23
24    let env = ctx.data();
25    let memory = unsafe { env.memory_view(&ctx) };
26    let addr = wasi_try_ok!(crate::net::read_ip_port(&memory, addr));
27    let peer_addr = SocketAddr::new(addr.0, addr.1);
28    Span::current().record("addr", format!("{peer_addr:?}"));
29
30    wasi_try_ok!(sock_connect_internal(&mut ctx, sock, peer_addr)?);
31
32    #[cfg(feature = "journal")]
33    if ctx.data().enable_journal {
34        let local_addr = wasi_try_ok!(__sock_actor(
35            &mut ctx,
36            sock,
37            Rights::empty(),
38            |socket, _| socket.addr_local()
39        ));
40        JournalEffector::save_sock_connect(&mut ctx, sock, local_addr, peer_addr).map_err(
41            |err| {
42                tracing::error!("failed to save sock_connected event - {}", err);
43                WasiError::Exit(ExitCode::from(Errno::Fault))
44            },
45        )?;
46    }
47
48    Ok(Errno::Success)
49}
50
51fn nonblocking_connect_result(status: crate::net::socket::WasiSocketStatus) -> Result<(), Errno> {
52    match status {
53        crate::net::socket::WasiSocketStatus::Opening => Err(Errno::Inprogress),
54        crate::net::socket::WasiSocketStatus::Opened => Ok(()),
55        crate::net::socket::WasiSocketStatus::Closed
56        | crate::net::socket::WasiSocketStatus::Failed => Err(Errno::Notconn),
57    }
58}
59
60pub(crate) fn sock_connect_internal(
61    ctx: &mut FunctionEnvMut<'_, WasiEnv>,
62    sock: WasiFd,
63    addr: SocketAddr,
64) -> Result<Result<(), Errno>, WasiError> {
65    let env = ctx.data();
66    let net = env.net().clone();
67    let tasks = ctx.data().tasks().clone();
68    let nonblocking = match env.state.fs.get_fd(sock) {
69        Ok(fd_entry) => fd_entry.inner.flags.contains(Fdflags::NONBLOCK),
70        Err(err) => return Ok(Err(err)),
71    };
72    wasi_try_ok_ok!(__sock_upgrade(
73        ctx,
74        sock,
75        Rights::SOCK_CONNECT,
76        move |mut socket, flags| async move {
77            // Auto-bind UDP
78            let bound_socket = socket.auto_bind_udp(tasks.deref(), net.deref()).await?;
79            socket = bound_socket.clone().unwrap_or(socket);
80            let connected_socket = socket
81                .connect(
82                    tasks.deref(),
83                    net.deref(),
84                    addr,
85                    None,
86                    flags.contains(Fdflags::NONBLOCK),
87                )
88                .await?;
89            Ok(connected_socket.or(bound_socket))
90        }
91    ));
92
93    if nonblocking {
94        let status = match __sock_actor(ctx, sock, Rights::empty(), |socket, _| socket.status()) {
95            Ok(status) => status,
96            Err(err) => return Ok(Err(err)),
97        };
98        return Ok(nonblocking_connect_result(status));
99    }
100
101    Ok(Ok(()))
102}
103
104#[cfg(test)]
105mod tests {
106    use super::nonblocking_connect_result;
107    use crate::net::socket::WasiSocketStatus;
108    use wasmer_wasix_types::wasi::Errno;
109
110    #[test]
111    fn nonblocking_connect_result_maps_socket_states() {
112        assert_eq!(
113            nonblocking_connect_result(WasiSocketStatus::Opening),
114            Err(Errno::Inprogress)
115        );
116        assert_eq!(nonblocking_connect_result(WasiSocketStatus::Opened), Ok(()));
117        assert_eq!(
118            nonblocking_connect_result(WasiSocketStatus::Failed),
119            Err(Errno::Notconn)
120        );
121        assert_eq!(
122            nonblocking_connect_result(WasiSocketStatus::Closed),
123            Err(Errno::Notconn)
124        );
125    }
126}
wasmer_wasix/syscalls/wasix/sock_connect.rs

wasmer_wasix/syscalls/wasix/
sock_connect.rs
