migrate to rust 1.64 network primitives rust-lang/rust#78802

Most code and macros to convert from and to rust layout
such as Ipv4Addr, Ipv6Addr, SocketAddrV4, SocketAddrV6
has been copied from the mio crate.

All system calls have been replaced by the syscall macro
similarly to the mio crate.

Fixes phsym#12

Author: Olivier Médoc

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "rust-sctp"
-version = "0.0.5"
+version = "0.0.6"
 description = "High level SCTP networking library"
 repository = "https://github.com/phsym/rust-sctp"
 documentation = "http://phsym.github.io/rust-sctp"

src/lib.rs

@@ -19,6 +19,10 @@ use std::net::{ToSocketAddrs, SocketAddr, Shutdown};
 
 #[cfg(target_os="linux")]
 use std::os::unix::io::{AsRawFd, RawFd, FromRawFd};
+
+#[cfg(target_os="linux")]
+pub mod mio_unix;
+
 #[cfg(target_os="windows")]
 use std::os::windows::io::{AsRawHandle, RawHandle, FromRawHandle};
 

src/mio_unix.rs

@@ -0,0 +1,135 @@
+#[macro_export]
+// copy from mio::sys::unix::mod
+// https://github.com/faern/mio/blob/master/src/sys/unix/mod.rs
+/// Helper macro to execute a system call that returns an `io::Result`.
+//
+// Macro must be defined before any modules that uses them.
+#[allow(unused_macros)]
+macro_rules! syscall {
+	($fn: ident ( $($arg: expr),* $(,)* ) ) => {{
+		let res = unsafe { libc::$fn($($arg, )*) };
+		if res == -1 {
+			Err(std::io::Error::last_os_error())
+		} else {
+			Ok(res)
+		}
+	}};
+}
+
+#[macro_export]
+#[allow(unused_macros)]
+macro_rules! sctp_syscall {
+	($fn: ident ( $($arg: expr),* $(,)* ) ) => {{
+		let res = unsafe { sctp_sys::$fn($($arg, )*) };
+		if res == -1 {
+			Err(std::io::Error::last_os_error())
+		} else {
+			Ok(res)
+		}
+	}};
+}
+
+use std::mem;
+use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+
+// copy from mio::sys::unix::net
+// https://github.com/faern/mio/blob/master/src/sys/unix/net.rs
+/// A type with the same memory layout as `libc::sockaddr`. Used in converting Rust level
+/// SocketAddr* types into their system representation. The benefit of this specific
+/// type over using `libc::sockaddr_storage` is that this type is exactly as large as it
+/// needs to be and not a lot larger. And it can be initialized cleaner from Rust.
+#[repr(C)]
+pub(crate) union SocketAddrCRepr {
+	v4: libc::sockaddr_in,
+	v6: libc::sockaddr_in6,
+}
+
+impl SocketAddrCRepr {
+	pub(crate) fn as_ptr(&self) -> *const libc::sockaddr {
+		self as *const _ as *const libc::sockaddr
+	}
+}
+
+/// Converts a Rust `SocketAddr` into the system representation.
+pub(crate) fn socket_addr(addr: &SocketAddr) -> (SocketAddrCRepr, libc::socklen_t) {
+	match addr {
+		SocketAddr::V4(ref addr) => {
+			// `s_addr` is stored as BE on all machine and the array is in BE order.
+			// So the native endian conversion method is used so that it's never swapped.
+			let sin_addr = libc::in_addr { s_addr: u32::from_ne_bytes(addr.ip().octets()) };
+
+			let sockaddr_in = libc::sockaddr_in {
+				sin_family: libc::AF_INET as libc::sa_family_t,
+				sin_port: addr.port().to_be(),
+				sin_addr,
+				sin_zero: [0; 8],
+				#[cfg(any(
+					target_os = "dragonfly",
+					target_os = "freebsd",
+					target_os = "ios",
+					target_os = "macos",
+					target_os = "netbsd",
+					target_os = "openbsd"
+				))]
+				sin_len: 0,
+			};
+
+			let sockaddr = SocketAddrCRepr { v4: sockaddr_in };
+			(sockaddr, mem::size_of::<libc::sockaddr_in>() as libc::socklen_t)
+		}
+		SocketAddr::V6(ref addr) => {
+			let sockaddr_in6 = libc::sockaddr_in6 {
+				sin6_family: libc::AF_INET6 as libc::sa_family_t,
+				sin6_port: addr.port().to_be(),
+				sin6_addr: libc::in6_addr { s6_addr: addr.ip().octets() },
+				sin6_flowinfo: addr.flowinfo(),
+				sin6_scope_id: addr.scope_id(),
+				#[cfg(any(
+					target_os = "dragonfly",
+					target_os = "freebsd",
+					target_os = "ios",
+					target_os = "macos",
+					target_os = "netbsd",
+					target_os = "openbsd"
+				))]
+				sin6_len: 0,
+				#[cfg(any(target_os = "solaris", target_os = "illumos"))]
+				__sin6_src_id: 0,
+			};
+
+			let sockaddr = SocketAddrCRepr { v6: sockaddr_in6 };
+			(sockaddr, mem::size_of::<libc::sockaddr_in6>() as libc::socklen_t)
+		}
+	}
+}
+
+/// Converts a `libc::sockaddr` compatible struct into a native Rust `SocketAddr`.
+///
+/// # Safety
+///
+/// `storage` must have the `ss_family` field correctly initialized.
+/// `storage` must be initialised to a `sockaddr_in` or `sockaddr_in6`.
+pub(crate) unsafe fn to_socket_addr(
+	storage: *const libc::sockaddr_storage,
+) -> std::io::Result<SocketAddr> {
+	match (*storage).ss_family as libc::c_int {
+		libc::AF_INET => {
+			// Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
+			let addr: &libc::sockaddr_in = &*(storage as *const libc::sockaddr_in);
+			let ip = Ipv4Addr::from(addr.sin_addr.s_addr.to_ne_bytes());
+			let port = u16::from_be(addr.sin_port);
+			Ok(SocketAddr::V4(SocketAddrV4::new(ip, port)))
+		},
+		libc::AF_INET6 => {
+			// Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
+			let addr: &libc::sockaddr_in6 = &*(storage as *const libc::sockaddr_in6);
+			let ip = Ipv6Addr::from(addr.sin6_addr.s6_addr);
+			let port = u16::from_be(addr.sin6_port);
+			Ok(SocketAddr::V6(SocketAddrV6::new(ip, port, addr.sin6_flowinfo, addr.sin6_scope_id)))
+		},
+		_ => Err(std::io::ErrorKind::InvalidInput.into()),
+	}
+}
+//
+// CODE COPY ENDS HERE
+//