mio/sys/unix/
net.rs

1use std::io;
2use std::mem::size_of;
3use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
4
5pub(crate) fn new_ip_socket(addr: SocketAddr, socket_type: libc::c_int) -> io::Result<libc::c_int> {
6    let domain = match addr {
7        SocketAddr::V4(..) => libc::AF_INET,
8        SocketAddr::V6(..) => libc::AF_INET6,
9    };
10
11    new_socket(domain, socket_type)
12}
13
14/// Create a new non-blocking socket.
15pub(crate) fn new_socket(domain: libc::c_int, socket_type: libc::c_int) -> io::Result<libc::c_int> {
16    #[cfg(any(
17        target_os = "android",
18        target_os = "dragonfly",
19        target_os = "freebsd",
20        target_os = "hurd",
21        target_os = "illumos",
22        target_os = "linux",
23        target_os = "netbsd",
24        target_os = "openbsd",
25        target_os = "solaris",
26        target_os = "hermit",
27    ))]
28    let socket_type = socket_type | libc::SOCK_NONBLOCK | libc::SOCK_CLOEXEC;
29    #[cfg(target_os = "nto")]
30    let socket_type = socket_type | libc::SOCK_CLOEXEC;
31
32    let socket = syscall!(socket(domain, socket_type, 0))?;
33
34    // Mimick `libstd` and set `SO_NOSIGPIPE` on apple systems.
35    #[cfg(any(
36        target_os = "ios",
37        target_os = "macos",
38        target_os = "tvos",
39        target_os = "visionos",
40        target_os = "watchos",
41    ))]
42    if let Err(err) = syscall!(setsockopt(
43        socket,
44        libc::SOL_SOCKET,
45        libc::SO_NOSIGPIPE,
46        &1 as *const libc::c_int as *const libc::c_void,
47        size_of::<libc::c_int>() as libc::socklen_t
48    )) {
49        let _ = syscall!(close(socket));
50        return Err(err);
51    }
52
53    // Darwin (and others) doesn't have SOCK_NONBLOCK or SOCK_CLOEXEC.
54    #[cfg(any(
55        target_os = "ios",
56        target_os = "macos",
57        target_os = "tvos",
58        target_os = "visionos",
59        target_os = "watchos",
60        target_os = "espidf",
61        target_os = "vita",
62        target_os = "nto",
63    ))]
64    {
65        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFL, libc::O_NONBLOCK)) {
66            let _ = syscall!(close(socket));
67            return Err(err);
68        }
69        #[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "nto")))]
70        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFD, libc::FD_CLOEXEC)) {
71            let _ = syscall!(close(socket));
72            return Err(err);
73        }
74    }
75
76    Ok(socket)
77}
78
79/// A type with the same memory layout as `libc::sockaddr`. Used in converting Rust level
80/// SocketAddr* types into their system representation. The benefit of this specific
81/// type over using `libc::sockaddr_storage` is that this type is exactly as large as it
82/// needs to be and not a lot larger. And it can be initialized cleaner from Rust.
83#[repr(C)]
84pub(crate) union SocketAddrCRepr {
85    v4: libc::sockaddr_in,
86    v6: libc::sockaddr_in6,
87}
88
89impl SocketAddrCRepr {
90    pub(crate) fn as_ptr(&self) -> *const libc::sockaddr {
91        self as *const _ as *const libc::sockaddr
92    }
93}
94
95/// Converts a Rust `SocketAddr` into the system representation.
96pub(crate) fn socket_addr(addr: &SocketAddr) -> (SocketAddrCRepr, libc::socklen_t) {
97    match addr {
98        SocketAddr::V4(ref addr) => {
99            // `s_addr` is stored as BE on all machine and the array is in BE order.
100            // So the native endian conversion method is used so that it's never swapped.
101            let sin_addr = libc::in_addr {
102                s_addr: u32::from_ne_bytes(addr.ip().octets()),
103            };
104
105            let sockaddr_in = libc::sockaddr_in {
106                sin_family: libc::AF_INET as libc::sa_family_t,
107                sin_port: addr.port().to_be(),
108                sin_addr,
109                #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
110                sin_zero: [0; 8],
111                #[cfg(target_os = "haiku")]
112                sin_zero: [0; 24],
113                #[cfg(target_os = "vita")]
114                sin_zero: [0; 6],
115                #[cfg(any(
116                    target_os = "aix",
117                    target_os = "dragonfly",
118                    target_os = "freebsd",
119                    target_os = "haiku",
120                    target_os = "hurd",
121                    target_os = "ios",
122                    target_os = "macos",
123                    target_os = "netbsd",
124                    target_os = "openbsd",
125                    target_os = "tvos",
126                    target_os = "visionos",
127                    target_os = "watchos",
128                    target_os = "espidf",
129                    target_os = "vita",
130                    target_os = "hermit",
131                    target_os = "nto",
132                ))]
133                sin_len: 0,
134                #[cfg(target_os = "vita")]
135                sin_vport: addr.port().to_be(),
136            };
137
138            let sockaddr = SocketAddrCRepr { v4: sockaddr_in };
139            let socklen = size_of::<libc::sockaddr_in>() as libc::socklen_t;
140            (sockaddr, socklen)
141        }
142        SocketAddr::V6(ref addr) => {
143            let sockaddr_in6 = libc::sockaddr_in6 {
144                sin6_family: libc::AF_INET6 as libc::sa_family_t,
145                sin6_port: addr.port().to_be(),
146                sin6_addr: libc::in6_addr {
147                    s6_addr: addr.ip().octets(),
148                },
149                sin6_flowinfo: addr.flowinfo(),
150                sin6_scope_id: addr.scope_id(),
151                #[cfg(any(
152                    target_os = "aix",
153                    target_os = "dragonfly",
154                    target_os = "freebsd",
155                    target_os = "haiku",
156                    target_os = "hurd",
157                    target_os = "ios",
158                    target_os = "macos",
159                    target_os = "netbsd",
160                    target_os = "openbsd",
161                    target_os = "tvos",
162                    target_os = "visionos",
163                    target_os = "watchos",
164                    target_os = "espidf",
165                    target_os = "vita",
166                    target_os = "nto",
167                    target_os = "hermit",
168                ))]
169                sin6_len: 0,
170                #[cfg(target_os = "vita")]
171                sin6_vport: addr.port().to_be(),
172                #[cfg(any(target_os = "illumos", target_os = "solaris"))]
173                __sin6_src_id: 0,
174            };
175
176            let sockaddr = SocketAddrCRepr { v6: sockaddr_in6 };
177            let socklen = size_of::<libc::sockaddr_in6>() as libc::socklen_t;
178            (sockaddr, socklen)
179        }
180    }
181}
182
183/// Converts a `libc::sockaddr` compatible struct into a native Rust `SocketAddr`.
184///
185/// # Safety
186///
187/// `storage` must have the `ss_family` field correctly initialized.
188/// `storage` must be initialised to a `sockaddr_in` or `sockaddr_in6`.
189pub(crate) unsafe fn to_socket_addr(
190    storage: *const libc::sockaddr_storage,
191) -> io::Result<SocketAddr> {
192    match (*storage).ss_family as libc::c_int {
193        libc::AF_INET => {
194            // Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
195            let addr: &libc::sockaddr_in = &*(storage as *const libc::sockaddr_in);
196            let ip = Ipv4Addr::from(addr.sin_addr.s_addr.to_ne_bytes());
197            let port = u16::from_be(addr.sin_port);
198            Ok(SocketAddr::V4(SocketAddrV4::new(ip, port)))
199        }
200        libc::AF_INET6 => {
201            // Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
202            let addr: &libc::sockaddr_in6 = &*(storage as *const libc::sockaddr_in6);
203            let ip = Ipv6Addr::from(addr.sin6_addr.s6_addr);
204            let port = u16::from_be(addr.sin6_port);
205            Ok(SocketAddr::V6(SocketAddrV6::new(
206                ip,
207                port,
208                addr.sin6_flowinfo,
209                addr.sin6_scope_id,
210            )))
211        }
212        _ => Err(io::ErrorKind::InvalidInput.into()),
213    }
214}
mio/sys/unix/net.rs

mio/sys/unix/
net.rs
