From 3438b80afc64a74bd68b2e3b9a9b52fd38261ec8 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 29 Oct 2026 04:03:32 +0100
Subject: libp2p: debug hole punching

---
 src/transport/libp2p.rs | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src')

diff --git a/src/transport/libp2p.rs b/src/transport/libp2p.rs
index b53a4c3..9b7c666 100644
--- a/src/transport/libp2p.rs
+++ b/src/transport/libp2p.rs
@@ -1006,6 +1006,11 @@ impl ::libp2p::swarm::NetworkBehaviour for HolePunching {
         local_addr: &Multiaddr,
         remote_addr: &Multiaddr,
     ) -> Result<::libp2p::swarm::THandler<Self>, ::libp2p::swarm::ConnectionDenied> {
+        if is_relayed(local_addr) {
+            // DCUtR offers its candidates on this connection: where others saw us, and
+            // these.
+            debug!(peer = %Addressed(SCHEME, &peer), listening = ?self.listening, "Reached through a relay; hole punching offers where we listen too");
+        }
         self.inner.handle_established_inbound_connection(
             connection_id,
             peer,
@@ -1052,6 +1057,7 @@ impl ::libp2p::swarm::NetworkBehaviour for HolePunching {
         match event {
             FromSwarm::NewListenAddr(new) if offered(new.addr) => {
                 if !self.listening.contains(new.addr) {
+                    debug!(address = %new.addr, "Offering where we listen for hole punching");
                     self.listening.push(new.addr.clone());
                 }
                 self.offer_listening();
-- 
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