4 files changed, 93 insertions, 12 deletions

diff --git a/src/nix.rs b/src/nix.rs
index e59ceaed..3cc5beff 100644
--- a/src/nix.rs
+++ b/src/nix.rs
@@ -1,7 +1,7 @@
 use libc;
 use std;
 
-use errno::Errno;
+use errno::{Errno, EINVAL};
 
 pub type NixResult<T> = Result<T, NixError>;
 
@@ -11,6 +11,12 @@ pub enum NixError {
     InvalidPath
 }
 
+impl NixError {
+    pub fn invalid_argument() -> NixError {
+        NixError::Sys(EINVAL)
+    }
+}
+
 pub trait NixPath {
     fn with_nix_path<T, F>(&self, f: F) -> Result<T, NixError>
         where F: FnOnce(*const libc::c_char) -> T;
diff --git a/src/sys/socket/addr.rs b/src/sys/socket/addr.rs
index 7a814d15..835979cf 100644
--- a/src/sys/socket/addr.rs
+++ b/src/sys/socket/addr.rs
@@ -1,10 +1,17 @@
 use {NixResult, NixError};
 use super::{sa_family_t, in_addr, sockaddr_in, sockaddr_in6, sockaddr_un, AF_UNIX, AF_INET};
 use errno::Errno;
+use libc;
 use std::{mem, net, path, ptr};
 use std::ffi::{AsOsStr, CStr, OsStr};
 use std::os::unix::OsStrExt;
 
+/*
+ *
+ * ===== Sock addr =====
+ *
+ */
+
 /// Represents a socket address
 #[derive(Copy)]
 pub enum SockAddr {
@@ -66,21 +73,16 @@ impl ToSockAddr for path::Path {
 impl ToSockAddr for net::SocketAddr {
     fn to_sock_addr(&self) -> NixResult<SockAddr> {
         use std::net::IpAddr;
-        use std::num::Int;
 
         match self.ip() {
             IpAddr::V4(ip) => {
-                let addr = ip.octets();
+                let addr = ip.to_in_addr()
+                    .expect("in_addr conversion expected to be successful");
+
                 Ok(SockAddr::IpV4(sockaddr_in {
                     sin_family: AF_INET as sa_family_t,
                     sin_port: self.port(),
-                    sin_addr: in_addr {
-                        s_addr: Int::from_be(
-                            ((addr[0] as u32) << 24) |
-                            ((addr[1] as u32) << 16) |
-                            ((addr[2] as u32) <<  8) |
-                            ((addr[3] as u32) <<  0))
-                    },
+                    sin_addr: addr,
                     .. unsafe { mem::zeroed() }
                 }))
             }
@@ -129,3 +131,70 @@ impl FromSockAddr for path::PathBuf {
         None
     }
 }
+
+/*
+ *
+ * ===== InAddr =====
+ *
+ */
+
+pub trait ToInAddr {
+    fn to_in_addr(self) -> Option<libc::in_addr>;
+}
+
+impl ToInAddr for SockAddr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        match self {
+            SockAddr::IpV4(sock) => Some(sock.sin_addr),
+            _ => None,
+        }
+    }
+}
+
+impl<'a> ToInAddr for &'a SockAddr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        match *self {
+            SockAddr::IpV4(ref sock) => Some(sock.sin_addr),
+            _ => None,
+        }
+    }
+}
+
+impl ToInAddr for net::IpAddr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        match self {
+            net::IpAddr::V4(addr) => addr.to_in_addr(),
+            _ => None,
+        }
+    }
+}
+
+impl<'a> ToInAddr for &'a net::IpAddr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        match *self {
+            net::IpAddr::V4(addr) => addr.to_in_addr(),
+            _ => None,
+        }
+    }
+}
+
+impl ToInAddr for net::Ipv4Addr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        use std::num::Int;
+
+        let addr = self.octets();
+        Some(in_addr {
+            s_addr: Int::from_be(
+                        ((addr[0] as u32) << 24) |
+                        ((addr[1] as u32) << 16) |
+                        ((addr[2] as u32) <<  8) |
+                        ((addr[3] as u32) <<  0))
+        })
+    }
+}
+
+impl<'a> ToInAddr for &'a net::Ipv4Addr {
+    fn to_in_addr(self) -> Option<libc::in_addr> {
+        (*self).to_in_addr()
+    }
+}
diff --git a/src/sys/socket/mod.rs b/src/sys/socket/mod.rs
index 046df007..da29ae88 100644
--- a/src/sys/socket/mod.rs
+++ b/src/sys/socket/mod.rs
@@ -10,6 +10,7 @@ use std::os::unix::prelude::*;
 mod addr;
 mod consts;
 mod ffi;
+mod multicast;
 pub mod sockopt;
 
 /*
@@ -21,7 +22,8 @@ pub mod sockopt;
 pub use self::addr::{
     SockAddr,
     ToSockAddr,
-    FromSockAddr
+    FromSockAddr,
+    ToInAddr,
 };
 pub use libc::{
     in_addr,
@@ -31,7 +33,10 @@ pub use libc::{
     sockaddr_in6,
     sockaddr_un,
     sa_family_t,
-    ip_mreq
+};
+
+pub use self::multicast::{
+    ip_mreq,
 };
 pub use self::consts::*;
 
diff --git a/src/sys/socket/sockopt.rs b/src/sys/socket/sockopt.rs
index 79c1800e..a8063a56 100644
--- a/src/sys/socket/sockopt.rs
+++ b/src/sys/socket/sockopt.rs
@@ -72,6 +72,7 @@ sockopt_impl!(ReusePort, consts::SO_REUSEPORT, bool);
 sockopt_impl!(TcpNoDelay, consts::TCP_NODELAY, bool);
 sockopt_impl!(Linger, consts::SO_LINGER, super::linger);
 sockopt_impl!(IpAddMembership, consts::IP_ADD_MEMBERSHIP, super::ip_mreq);
+sockopt_impl!(IpDropMembership, consts::IP_DROP_MEMBERSHIP, super::ip_mreq);
 sockopt_impl!(IpMulticastTtl, consts::IP_MULTICAST_TTL, u8);
 
 /*