Merge #835

835: Add socket options for IP_TRANSPARENT / BIND_ANY r=asomers a=justinlatimer

Add socket options for implementing a transparent proxy.
Sources:
[Linux](https://www.kernel.org/doc/Documentation/networking/tproxy.txt)
[OpenBSD](https://man.openbsd.org/setsockopt.2#SO_BINDANY)
[FreeBSD](https://www.freebsd.org/cgi/man.cgi?query=ip&manpath=FreeBSD+11.1-RELEASE)

Thanks!

CHANGELOG.md

@@ -56,6 +56,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#826](https://github.com/nix-rust/nix/pull/826))
 - Added `nix::sys::socket::LinkAddr` on Linux and all bsdlike system.
   ([#813](https://github.com/nix-rust/nix/pull/813))
+- Add socket options for `IP_TRANSPARENT` / `BIND_ANY`.
+  ([#835](https://github.com/nix-rust/nix/pull/835))
 
 ### Changed
 - Exposed the `mqueue` module for all supported operating systems.

src/sys/socket/sockopt.rs

@@ -159,26 +159,32 @@ sockopt_impl!(GetOnly, SocketError, libc::SOL_SOCKET, libc::SO_ERROR, i32);
 sockopt_impl!(Both, KeepAlive, libc::SOL_SOCKET, libc::SO_KEEPALIVE, bool);
 #[cfg(all(target_os = "linux", not(target_arch="arm")))]
 sockopt_impl!(GetOnly, PeerCredentials, libc::SOL_SOCKET, libc::SO_PEERCRED, super::UnixCredentials);
-#[cfg(any(target_os = "macos",
-          target_os = "ios"))]
+#[cfg(any(target_os = "ios",
+          target_os = "macos"))]
 sockopt_impl!(Both, TcpKeepAlive, libc::IPPROTO_TCP, libc::TCP_KEEPALIVE, u32);
-#[cfg(any(target_os = "freebsd",
+#[cfg(any(target_os = "android",
           target_os = "dragonfly",
+          target_os = "freebsd",
           target_os = "linux",
-          target_os = "android",
           target_os = "nacl"))]
 sockopt_impl!(Both, TcpKeepIdle, libc::IPPROTO_TCP, libc::TCP_KEEPIDLE, u32);
 sockopt_impl!(Both, RcvBuf, libc::SOL_SOCKET, libc::SO_RCVBUF, usize);
 sockopt_impl!(Both, SndBuf, libc::SOL_SOCKET, libc::SO_SNDBUF, usize);
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "android", target_os = "linux"))]
 sockopt_impl!(SetOnly, RcvBufForce, libc::SOL_SOCKET, libc::SO_RCVBUFFORCE, usize);
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "android", target_os = "linux"))]
 sockopt_impl!(SetOnly, SndBufForce, libc::SOL_SOCKET, libc::SO_SNDBUFFORCE, usize);
 sockopt_impl!(GetOnly, SockType, libc::SOL_SOCKET, libc::SO_TYPE, super::SockType);
 sockopt_impl!(GetOnly, AcceptConn, libc::SOL_SOCKET, libc::SO_ACCEPTCONN, bool);
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "android", target_os = "linux"))]
 sockopt_impl!(GetOnly, OriginalDst, libc::SOL_IP, libc::SO_ORIGINAL_DST, libc::sockaddr_in);
 sockopt_impl!(Both, ReceiveTimestamp, libc::SOL_SOCKET, libc::SO_TIMESTAMP, bool);
+#[cfg(any(target_os = "android", target_os = "linux"))]
+sockopt_impl!(Both, IpTransparent, libc::SOL_IP, libc::IP_TRANSPARENT, bool);
+#[cfg(target_os = "openbsd")]
+sockopt_impl!(Both, BindAny, libc::SOL_SOCKET, libc::SO_BINDANY, bool);
+#[cfg(target_os = "freebsd")]
+sockopt_impl!(Both, BindAny, libc::IPPROTO_IP, libc::IP_BINDANY, bool);
 
 /*
  *