copied from: github.com/meh/rust-tun

src/address.rs

@@ -0,0 +1,128 @@
+//            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+//                    Version 2, December 2004
+//
+// Copyleft (ↄ) meh. <meh@schizofreni.co> | http://meh.schizofreni.co
+//
+// Everyone is permitted to copy and distribute verbatim or modified
+// copies of this license document, and changing it is allowed as long
+// as the name is changed.
+//
+//            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+//   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+//
+//  0. You just DO WHAT THE FUCK YOU WANT TO.
+
+use std::net::{IpAddr, Ipv4Addr};
+use std::net::{SocketAddr, SocketAddrV4};
+
+use crate::error::*;
+
+/// Helper trait to convert things into IPv4 addresses.
+#[allow(clippy::wrong_self_convention)]
+pub trait IntoAddress {
+    /// Convert the type to an `Ipv4Addr`.
+    fn into_address(&self) -> Result<Ipv4Addr>;
+}
+
+impl IntoAddress for u32 {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        Ok(Ipv4Addr::new(
+            ((*self) & 0xff) as u8,
+            ((*self >> 8) & 0xff) as u8,
+            ((*self >> 16) & 0xff) as u8,
+            ((*self >> 24) & 0xff) as u8,
+        ))
+    }
+}
+
+impl IntoAddress for i32 {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (*self as u32).into_address()
+    }
+}
+
+impl IntoAddress for (u8, u8, u8, u8) {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        Ok(Ipv4Addr::new(self.0, self.1, self.2, self.3))
+    }
+}
+
+impl IntoAddress for str {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        self.parse().map_err(|_| Error::InvalidAddress)
+    }
+}
+
+impl<'a> IntoAddress for &'a str {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (*self).into_address()
+    }
+}
+
+impl IntoAddress for String {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}
+
+impl<'a> IntoAddress for &'a String {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}
+
+impl IntoAddress for Ipv4Addr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        Ok(*self)
+    }
+}
+
+impl<'a> IntoAddress for &'a Ipv4Addr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}
+
+impl IntoAddress for IpAddr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        match *self {
+            IpAddr::V4(ref value) => Ok(*value),
+
+            IpAddr::V6(_) => Err(Error::InvalidAddress),
+        }
+    }
+}
+
+impl<'a> IntoAddress for &'a IpAddr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}
+
+impl IntoAddress for SocketAddrV4 {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        Ok(*self.ip())
+    }
+}
+
+impl<'a> IntoAddress for &'a SocketAddrV4 {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}
+
+impl IntoAddress for SocketAddr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        match *self {
+            SocketAddr::V4(ref value) => Ok(*value.ip()),
+
+            SocketAddr::V6(_) => Err(Error::InvalidAddress),
+        }
+    }
+}
+
+impl<'a> IntoAddress for &'a SocketAddr {
+    fn into_address(&self) -> Result<Ipv4Addr> {
+        (&**self).into_address()
+    }
+}