Add option to configure the TCP ttl

Signed-off-by: trivernis <trivernis@protonmail.com>

src/protocol/tcp.rs

@@ -5,18 +5,27 @@ use std::net::SocketAddr;
 use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
 use tokio::net::{TcpListener, TcpStream};
 
+#[derive(Clone, Debug, Default)]
+pub struct TcpOptions {
+    /// The time to live for the socket connection
+    pub ttl: Option<u32>,
+}
+
 #[async_trait]
 impl AsyncStreamProtocolListener for TcpListener {
     type AddressType = SocketAddr;
     type RemoteAddressType = SocketAddr;
     type Stream = TcpStream;
-    type ListenerOptions = ();
+    type ListenerOptions = TcpOptions;
 
     async fn protocol_bind(
         address: Self::AddressType,
-        _: Self::ListenerOptions,
+        options: Self::ListenerOptions,
     ) -> IPCResult<Self> {
         let listener = TcpListener::bind(address).await?;
+        if let Some(ttl) = options.ttl {
+            listener.set_ttl(ttl)?;
+        }
 
         Ok(listener)
     }
@@ -40,13 +49,16 @@ impl AsyncProtocolStreamSplit for TcpStream {
 #[async_trait]
 impl AsyncProtocolStream for TcpStream {
     type AddressType = SocketAddr;
-    type StreamOptions = ();
+    type StreamOptions = TcpOptions;
 
     async fn protocol_connect(
         address: Self::AddressType,
-        _: Self::StreamOptions,
+        options: Self::StreamOptions,
     ) -> IPCResult<Self> {
         let stream = TcpStream::connect(address).await?;
+        if let Some(ttl) = options.ttl {
+            stream.set_ttl(ttl)?;
+        }
 
         Ok(stream)
     }