socket: Respect IPv6 flowinfo and scope_id in InetAddr::from_std

Fixes nix-rust#329

src/sys/socket/addr.rs

@@ -36,12 +36,26 @@ pub enum InetAddr {
 
 impl InetAddr {
     pub fn from_std(std: &net::SocketAddr) -> InetAddr {
-        let ip = match *std {
-            net::SocketAddr::V4(ref addr) => IpAddr::V4(Ipv4Addr::from_std(&addr.ip())),
-            net::SocketAddr::V6(ref addr) => IpAddr::V6(Ipv6Addr::from_std(&addr.ip())),
-        };
-
-        InetAddr::new(ip, std.port())
+        match *std {
+            net::SocketAddr::V4(ref addr) => {
+                InetAddr::V4(libc::sockaddr_in {
+                    sin_family: AddressFamily::Inet as sa_family_t,
+                    sin_port: addr.port().to_be(),  // network byte order
+                    sin_addr: Ipv4Addr::from_std(addr.ip()).0,
+                    .. unsafe { mem::zeroed() }
+                })
+            }
+            net::SocketAddr::V6(ref addr) => {
+                InetAddr::V6(libc::sockaddr_in6 {
+                    sin6_family: AddressFamily::Inet6 as sa_family_t,
+                    sin6_port: addr.port().to_be(),  // network byte order
+                    sin6_addr: Ipv6Addr::from_std(addr.ip()).0,
+                    sin6_flowinfo: addr.flowinfo(),  // host byte order
+                    sin6_scope_id: addr.scope_id(),  // host byte order
+                    .. unsafe { mem::zeroed() }
+                })
+            }
+        }
     }
 
     pub fn new(ip: IpAddr, port: u16) -> InetAddr {

test/sys/test_socket.rs

@@ -1,5 +1,6 @@
 use nix::sys::socket::{InetAddr, UnixAddr, getsockname};
-use std::{mem, net};
+use std::mem;
+use std::net::{self, Ipv6Addr, SocketAddr, SocketAddrV6};
 use std::path::Path;
 use std::str::FromStr;
 use std::os::unix::io::{AsRawFd, RawFd};
@@ -28,6 +29,28 @@ pub fn test_inetv4_addr_to_sock_addr() {
     assert_eq!(actual, inet);
 }
 
+#[test]
+pub fn test_inetv6_addr_to_sock_addr() {
+    let port: u16 = 3000;
+    let flowinfo: u32 = 1;
+    let scope_id: u32 = 2;
+    let ip: Ipv6Addr = "fe80::1".parse().unwrap();
+
+    let actual = SocketAddr::V6(SocketAddrV6::new(ip, port, flowinfo, scope_id));
+    let addr = InetAddr::from_std(&actual);
+
+    match addr {
+        InetAddr::V6(addr) => {
+            assert_eq!(addr.sin6_port, port.to_be());
+            assert_eq!(addr.sin6_flowinfo, flowinfo);
+            assert_eq!(addr.sin6_scope_id, scope_id);
+        }
+        _ => panic!("nope"),
+    }
+
+    assert_eq!(actual, addr.to_std());
+}
+
 #[test]
 pub fn test_path_to_sock_addr() {
     let actual = Path::new("/foo/bar");