mio/sys/unix/
net.rs

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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        target_os = "cygwin",
28    ))]
29    let socket_type = socket_type | libc::SOCK_NONBLOCK | libc::SOCK_CLOEXEC;
30    #[cfg(target_os = "nto")]
31    let socket_type = socket_type | libc::SOCK_CLOEXEC;
32
33    let socket = syscall!(socket(domain, socket_type, 0))?;
34
35    // Mimic `libstd` and set `SO_NOSIGPIPE` on apple systems.
36    #[cfg(any(
37        target_os = "ios",
38        target_os = "macos",
39        target_os = "tvos",
40        target_os = "visionos",
41        target_os = "watchos",
42    ))]
43    if let Err(err) = syscall!(setsockopt(
44        socket,
45        libc::SOL_SOCKET,
46        libc::SO_NOSIGPIPE,
47        &1 as *const libc::c_int as *const libc::c_void,
48        size_of::<libc::c_int>() as libc::socklen_t
49    )) {
50        let _ = syscall!(close(socket));
51        return Err(err);
52    }
53
54    // Darwin (and others) doesn't have SOCK_NONBLOCK or SOCK_CLOEXEC.
55    #[cfg(any(
56        target_os = "aix",
57        target_os = "ios",
58        target_os = "macos",
59        target_os = "tvos",
60        target_os = "visionos",
61        target_os = "watchos",
62        target_os = "espidf",
63        target_os = "vita",
64        target_os = "nto",
65    ))]
66    {
67        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFL, libc::O_NONBLOCK)) {
68            let _ = syscall!(close(socket));
69            return Err(err);
70        }
71        #[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "nto")))]
72        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFD, libc::FD_CLOEXEC)) {
73            let _ = syscall!(close(socket));
74            return Err(err);
75        }
76    }
77
78    Ok(socket)
79}
80
81/// A type with the same memory layout as `libc::sockaddr`. Used in converting Rust level
82/// SocketAddr* types into their system representation. The benefit of this specific
83/// type over using `libc::sockaddr_storage` is that this type is exactly as large as it
84/// needs to be and not a lot larger. And it can be initialized cleaner from Rust.
85#[repr(C)]
86pub(crate) union SocketAddrCRepr {
87    v4: libc::sockaddr_in,
88    v6: libc::sockaddr_in6,
89}
90
91impl SocketAddrCRepr {
92    pub(crate) fn as_ptr(&self) -> *const libc::sockaddr {
93        self as *const _ as *const libc::sockaddr
94    }
95}
96
97/// Converts a Rust `SocketAddr` into the system representation.
98pub(crate) fn socket_addr(addr: &SocketAddr) -> (SocketAddrCRepr, libc::socklen_t) {
99    match addr {
100        SocketAddr::V4(ref addr) => {
101            // `s_addr` is stored as BE on all machine and the array is in BE order.
102            // So the native endian conversion method is used so that it's never swapped.
103            let sin_addr = libc::in_addr {
104                s_addr: u32::from_ne_bytes(addr.ip().octets()),
105            };
106
107            let sockaddr_in = libc::sockaddr_in {
108                sin_family: libc::AF_INET as libc::sa_family_t,
109                sin_port: addr.port().to_be(),
110                sin_addr,
111                #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
112                sin_zero: [0; 8],
113                #[cfg(target_os = "haiku")]
114                sin_zero: [0; 24],
115                #[cfg(target_os = "vita")]
116                sin_zero: [0; 6],
117                #[cfg(any(
118                    target_os = "aix",
119                    target_os = "dragonfly",
120                    target_os = "freebsd",
121                    target_os = "haiku",
122                    target_os = "hurd",
123                    target_os = "ios",
124                    target_os = "macos",
125                    target_os = "netbsd",
126                    target_os = "openbsd",
127                    target_os = "tvos",
128                    target_os = "visionos",
129                    target_os = "watchos",
130                    target_os = "espidf",
131                    target_os = "vita",
132                    target_os = "hermit",
133                    target_os = "nto",
134                ))]
135                sin_len: 0,
136                #[cfg(target_os = "vita")]
137                sin_vport: addr.port().to_be(),
138            };
139
140            let sockaddr = SocketAddrCRepr { v4: sockaddr_in };
141            let socklen = size_of::<libc::sockaddr_in>() as libc::socklen_t;
142            (sockaddr, socklen)
143        }
144        SocketAddr::V6(ref addr) => {
145            let sockaddr_in6 = libc::sockaddr_in6 {
146                sin6_family: libc::AF_INET6 as libc::sa_family_t,
147                sin6_port: addr.port().to_be(),
148                sin6_addr: libc::in6_addr {
149                    s6_addr: addr.ip().octets(),
150                },
151                sin6_flowinfo: addr.flowinfo(),
152                sin6_scope_id: addr.scope_id(),
153                #[cfg(any(
154                    target_os = "aix",
155                    target_os = "dragonfly",
156                    target_os = "freebsd",
157                    target_os = "haiku",
158                    target_os = "hurd",
159                    target_os = "ios",
160                    target_os = "macos",
161                    target_os = "netbsd",
162                    target_os = "openbsd",
163                    target_os = "tvos",
164                    target_os = "visionos",
165                    target_os = "watchos",
166                    target_os = "espidf",
167                    target_os = "vita",
168                    target_os = "nto",
169                    target_os = "hermit",
170                ))]
171                sin6_len: 0,
172                #[cfg(target_os = "vita")]
173                sin6_vport: addr.port().to_be(),
174                #[cfg(any(target_os = "illumos", target_os = "solaris"))]
175                __sin6_src_id: 0,
176            };
177
178            let sockaddr = SocketAddrCRepr { v6: sockaddr_in6 };
179            let socklen = size_of::<libc::sockaddr_in6>() as libc::socklen_t;
180            (sockaddr, socklen)
181        }
182    }
183}
184
185/// Converts a `libc::sockaddr` compatible struct into a native Rust `SocketAddr`.
186///
187/// # Safety
188///
189/// `storage` must have the `ss_family` field correctly initialized.
190/// `storage` must be initialised to a `sockaddr_in` or `sockaddr_in6`.
191pub(crate) unsafe fn to_socket_addr(
192    storage: *const libc::sockaddr_storage,
193) -> io::Result<SocketAddr> {
194    match (*storage).ss_family as libc::c_int {
195        libc::AF_INET => {
196            // Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
197            let addr: &libc::sockaddr_in = &*(storage as *const libc::sockaddr_in);
198            let ip = Ipv4Addr::from(addr.sin_addr.s_addr.to_ne_bytes());
199            let port = u16::from_be(addr.sin_port);
200            Ok(SocketAddr::V4(SocketAddrV4::new(ip, port)))
201        }
202        libc::AF_INET6 => {
203            // Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
204            let addr: &libc::sockaddr_in6 = &*(storage as *const libc::sockaddr_in6);
205            let ip = Ipv6Addr::from(addr.sin6_addr.s6_addr);
206            let port = u16::from_be(addr.sin6_port);
207            Ok(SocketAddr::V6(SocketAddrV6::new(
208                ip,
209                port,
210                addr.sin6_flowinfo,
211                addr.sin6_scope_id,
212            )))
213        }
214        _ => Err(io::ErrorKind::InvalidInput.into()),
215    }
216}
mio/sys/unix/net.rs

mio/sys/unix/
net.rs
