use nonce in handshake

To prevent stale hello replies to cause joins and thus stale sessions,
each run gets a random ID, which used as nonce in the handshake.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/state.rs b/src/state.rs
index bbda4e4..cfa5ddf 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -492,6 +492,9 @@ pub(crate) struct AppState {
     /// knows the swarm ID.
     pub(crate) swarm_key: Option<Arc<crate::swarm::auth::SwarmKey>>,
 
+    /// Random per run of this node; our HELLOs carry it and replies must echo it.
+    pub(crate) run_id: transport::RunId,
+
     /// While rejoining a newer epoch, the previous document, served read-only (and
     /// marked stale) instead of answering 503.
     pub(crate) stale: Arc<std::sync::RwLock<Option<StaleView>>>,