fix(relay): Add resource limits to CircuitReq to be set

Fixes #5466
Adds resource limits to `CircuitReq` to be set .

Pull-Request: #5493.

Author: Prabhat1308

protocols/relay/CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 0.17.3
 - Use `web-time` instead of `instant`.
   See [PR 5347](https://github.com/libp2p/rust-libp2p/pull/5347).
+- Add resource limits to `CircuitReq` to be set
+  See [PR 5493](https://github.com/libp2p/rust-libp2p/pull/5493)  
 
 ## 0.17.2
 

protocols/relay/src/protocol/inbound_hop.rs

@@ -115,6 +115,8 @@ impl ReservationReq {
 pub struct CircuitReq {
     dst: PeerId,
     substream: Framed<Stream, quick_protobuf_codec::Codec<proto::HopMessage>>,
+    max_circuit_duration: Duration,
+    max_circuit_bytes: u64,
 }
 
 impl CircuitReq {
@@ -127,7 +129,15 @@ impl CircuitReq {
             type_pb: proto::HopMessageType::STATUS,
             peer: None,
             reservation: None,
-            limit: None,
+            limit: Some(proto::Limit {
+                duration: Some(
+                    self.max_circuit_duration
+                        .as_secs()
+                        .try_into()
+                        .expect("`max_circuit_duration` not to exceed `u32::MAX`."),
+                ),
+                data: Some(self.max_circuit_bytes),
+            }),
             status: Some(proto::Status::OK),
         };
 
@@ -204,7 +214,12 @@ pub(crate) async fn handle_inbound_request(
 
             let dst = peer_id_res.map_err(|_| Error::ParsePeerId)?;
 
-            Either::Right(CircuitReq { dst, substream })
+            Either::Right(CircuitReq {
+                dst,
+                substream,
+                max_circuit_duration,
+                max_circuit_bytes,
+            })
         }
         Type::STATUS => return Err(Error::UnexpectedTypeStatus),
     };